WO2017138249A1 - Upper rotating body for construction machine - Google Patents

Upper rotating body for construction machine Download PDF

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Publication number
WO2017138249A1
WO2017138249A1 PCT/JP2016/087334 JP2016087334W WO2017138249A1 WO 2017138249 A1 WO2017138249 A1 WO 2017138249A1 JP 2016087334 W JP2016087334 W JP 2016087334W WO 2017138249 A1 WO2017138249 A1 WO 2017138249A1
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WO
WIPO (PCT)
Prior art keywords
cab
guard
opening
duct
sound
Prior art date
Application number
PCT/JP2016/087334
Other languages
French (fr)
Japanese (ja)
Inventor
京子 増田
伸一 木下
真史 入江
恵理 渡辺
康正 木村
Original Assignee
株式会社神戸製鋼所
コベルコ建機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社神戸製鋼所, コベルコ建機株式会社 filed Critical 株式会社神戸製鋼所
Priority to EP16889950.8A priority Critical patent/EP3415459B1/en
Publication of WO2017138249A1 publication Critical patent/WO2017138249A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/52—Details of compartments for driving engines or motors or of operator's stands or cabins
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
    • E02F9/0866—Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment

Definitions

  • the present invention relates to an upper swing body of a construction machine.
  • Patent Documents 1 and 2 describe an upper rotating body of a conventional construction machine.
  • a sound absorbing material is provided on the inner surface of the engine chamber on the rear side of the cab.
  • a sound absorbing material is provided in a portion where the boom and the cab face each other. Noise suppression in the cab is achieved by these sound absorbing materials.
  • an object of the present invention is to provide an upper rotating body of a construction machine that can suppress noise in the cab.
  • the upper turning body of the construction machine of the present invention includes a center section, a noise source accommodation guard, a cab, and a propagation part.
  • the center section is disposed to face each other in the left-right direction, has a plurality of side plates extending in the front-rear direction, and an internal space is formed between the plurality of side plates.
  • the noise source accommodation guard is disposed on the right side or the left side of the center section and accommodates the noise source therein.
  • the cab is disposed on the front side or the rear side of the noise source accommodation guard.
  • the propagation unit propagates the sound generated by the noise source from the inside of the noise source accommodation guard to the internal space of the center section.
  • the propagation part includes a first discharge opening and a first receiving opening.
  • the first emission opening is a first emission opening opened in the noise source accommodation guard, and allows the sound to be emitted from the inside of the noise source accommodation guard through the first emission opening.
  • the first receiving opening is a first receiving opening opened in the center section, and the sound emitted through the first discharge opening is received in the internal space through the first receiving opening. Is acceptable.
  • FIG. 3 is a cross-sectional view of the upper swing body 1A of FIG. It is sectional drawing which looked at the upper turning body 1B which concerns on 1st deformation
  • FIG. 7 is a cross-sectional view taken along arrow F7-F7 of the upper swing body 1D of FIG. It is a cross-sectional perspective view of upper revolving unit 1D of FIG. It is sectional drawing which looked at the upper turning body 1E which concerns on 4th modification embodiment of this invention from the front side X1. It is sectional drawing which looked at the upper turning body 1F which concerns on 5th modification embodiment of this invention from the front side X1. It is sectional drawing which looked at the upper turning body 201A which concerns on 2nd Embodiment of this invention from the top. It is a cross-sectional perspective view of the upper swing body 201A of FIG.
  • FIG. 20 is a perspective view showing a left duct 380 of the upper swing body 401C shown in FIG. It is sectional drawing which looked at upper revolving body 401D concerning the 10th modification of the present invention from the top. It is sectional drawing which looked at the upper turning body 501A which concerns on 5th Embodiment of this invention from the top. It is sectional drawing which looked at the upper turning body 501B which concerns on 11th deformation
  • the upper swing body 1A is a component of the construction machine.
  • the construction machine provided with the upper swing body 1A is, for example, a crane, and more specifically a mobile crane. In other embodiments, the construction machine may be an excavator (eg, a hydraulic excavator).
  • the upper swing body 1A is mounted on the lower travel body so as to be turnable with respect to the lower travel body (not shown).
  • the lower traveling body is, for example, a crawler type and may be a wheel type.
  • the upper swing body 1A includes a center section 10, a cab proximity guard 20 (noise source accommodation guard), a cab 25, an anti-cab side guard 30, and a duct structure 40 (propagation unit).
  • the center section 10 (swivel frame) is attached to the lower traveling body and provided at the center of the upper swing body 1A.
  • the cab proximity guard 20 and the anti-cab side guard 30 are attached (fixed) to the center section 10 so as to sandwich the center section 10.
  • a cab 25 is attached to the center section 10.
  • a plate-like base portion 100 is provided on the upper swing body 1A, and the center section 10, the cab proximity guard 20, the anti-cab side guard 30 and the cab 25 are fixed to the base portion 100, respectively. May be.
  • directions such as “front and rear”, “left and right”, and “up and down” are shown for explanation of the upper swing body according to each embodiment.
  • the center section 10 is arranged so that the longitudinal direction of the center section 10 is along the front-rear direction, and further, the width direction of the center section 10 is along the left-right direction.
  • the cab proximity guard 20 is disposed on the rear side of the cab 25 in FIG. 1, but the cab proximity guard 20 may be disposed on the front side of the cab 25.
  • the cab proximity guard 20 is disposed on the right side of the center section 10, the cab proximity guard 20 may be disposed on the left side of the center section 10.
  • Boom B is attached to the center section 10.
  • the boom B is a member for hanging a suspended load via a wire rope, and can be raised and lowered with respect to the upper swing body 1A.
  • the base end portion of the boom B is attached to the front end portion of the center section 10.
  • the boom B is a lattice boom having a lattice structure, for example.
  • a gantry and a winch (each not shown) are attached to the center section 10.
  • the center section 10 includes a bottom plate 11, a plurality of side plates 13, and a connecting member 15 (see FIG. 8).
  • the bottom plate 11 is a plate constituting the bottom portion (lower portion) of the center section 10 and extends along the front-rear direction and the left-right direction.
  • the plurality of side plates 13 are plates that protrude upward from the bottom plate 11, respectively, and extend in the front-rear direction and the up-down direction.
  • the plurality of side plates 13 include two side plates 13.
  • the plurality of side plates 13 may include three or more side plates.
  • the two side plates 13 are arranged to face each other in the left-right direction.
  • the two side plates 13 include a right side plate 13a (cab side plate) and a left side plate 13b (anti-cab side plate).
  • the right side plate 13a is disposed closest to the cab proximity guard 20 side (right side in FIG. 1).
  • the left side plate 13b is disposed closest to the anti-cab side guard 30 side (left side in FIG. 1).
  • an inner region A1 (inner space) of a center section region A described later is formed.
  • the connecting member 15 (see FIG. 8) is a member that connects the two side plates 13 to each other, and extends in the left-right direction.
  • the connecting member 15 has a plate shape, for example, and extends along the vertical direction.
  • the cab proximity guard 20 accommodates one or more noise sources inside.
  • Noise sources include, for example, the engine 21, the fan 22, a hydraulic pump (not shown), a hydraulic motor (not shown), a hydraulic valve (not shown), and the like.
  • the engine 21 is a drive source for the construction machine.
  • the fan 22 generates cooling air and cools, for example, a radiator (not shown).
  • the cab proximity guard 20 is disposed on the right side (outside in the left-right direction) of the center section 10 and is disposed at a position facing the center section 10 in the left-right direction. A predetermined gap is provided in the left-right direction between the cab proximity guard 20 and the right side plate 13a for easy assembly.
  • the cab proximity guard 20 is formed with an air inlet (not shown).
  • the intake port is provided, for example, in a rear portion (for example, a rear end portion) of the cab proximity guard 20.
  • the cab 25 (cab) is arranged on the front side of the cab proximity guard 20.
  • the cab 25 may be disposed on the rear side of the cab proximity guard 20.
  • the cab 25 is disposed so as to face the cab proximity guard 20 in the front-rear direction.
  • a member such as an oil tank (not shown) may be sandwiched between the cab 25 and the cab proximity guard 20.
  • the cab 25 is disposed on the right side of the center section 10.
  • the cab 25 may be arranged on the left side of the center section 10.
  • the anti-cab side guard 30 accommodates equipment (not shown).
  • the anti-cab side guard 30 faces the center section 10 in the left-right direction, and is disposed on the left side of the center section 10. More specifically, the anti-cab side guard 30 is arranged on the opposite side (left side, so-called anti-cab side) to the center section 10 from the side (right side) where the cab proximity guard 20 and the cab 25 are arranged.
  • the device accommodated in the anti-cab side guard 30 is, for example, a hydraulic device.
  • the hydraulic equipment includes, for example, a hydraulic motor for driving a winch (not shown) attached to the center section 10.
  • the hydraulic device may include an engine, a fan, a hydraulic pump, and the like.
  • the duct structure 40 propagates the sound generated by the noise source from the inside of the cab proximity guard 20 to the center section region A of the center section 10.
  • the duct structure 40 is a structure for reducing noise transmitted from the inside of the cab proximity guard 20 to the cab 25.
  • the duct structure 40 radiates the sound (sound wave) inside the cab proximity guard 20 at a position away from the cab 25. Inside the duct structure 40, air can flow and sound can be transmitted.
  • FIG. 1 the end surface of the cut portion is shown for the portion of the duct structure 40 (the same applies to other drawings (except for FIGS. 8, 12, 16, and 20)).
  • the duct structure 40 also has an exhaust duct function. Cooling air generated by the fan 22 flows inside the duct structure 40. The duct structure 40 discharges air (exhaust) inside the cab proximity guard 20 at a position away from the cab proximity guard 20.
  • the upstream side in the propagation direction of the sound transmitted through the duct structure 40 and the upstream side of the cooling air transmitted through the duct structure 40 are the same side (the same applies to the downstream side).
  • the upstream and downstream in the propagation direction of the sound transmitted through the duct structure 40 are simply referred to as “upstream” and “downstream”.
  • the position on the most upstream side of the duct structure 40 is defined as “the inlet of the duct structure 40”
  • the position on the most downstream side of the duct structure 40 is defined as “the outlet of the duct structure 40”.
  • the direction of flow inside the duct structure 40 is defined as “flow direction”.
  • the duct structure 40 substantially communicates the internal space of the cab proximity guard 20 with the inside of the space on the left side of the right side plate 13a. Specifically, the duct structure 40 substantially communicates the internal space of the cab proximity guard 20 and the space in the center section region A (see FIG. 4).
  • “substantially communicating” includes not only that the spaces communicate with each other due to the closed space, but also that the spaces communicate with each other through the substantially closed space as described later in “duct-like structure” (hereinafter referred to as “substantially communicating”). "Is the same). There may be a leaking portion (a portion where sound leaks, such as a small opening) in the middle of the flow path inside the duct structure 40.
  • the duct structure 40 does not have a plate-like side wall, and may have a portion made of a rubber plate or a rubber sheet. Part or all of the duct structure 40 may have a hose shape or a pipe shape.
  • the duct structure 40 includes an opening and a duct (tubular member).
  • the duct structure 40 includes, in order from the upstream side to the downstream side, a cab proximity guard opening 51 (first discharge opening), a right connection duct 55 (guide portion, accommodation guard side connection guide), and a right side plate opening 59 (first Receiving opening) and a center duct 60 (guide portion, center section internal guide).
  • the cab proximity guard opening 51 is an opening formed in the cab proximity guard 20 and is a through-hole penetrating the left side wall of the cab proximity guard 20 along the left-right direction.
  • the cab proximity guard opening 51 is disposed at a position facing the right side plate 13a in the left-right direction.
  • the cab proximity guard opening 51 is an inlet of the duct structure 40.
  • the cab proximity guard opening 51 allows sound to be emitted from the inside of the cab proximity guard 20 through the cab proximity guard opening 51.
  • the cab proximity guard opening 51 is disposed in front of the fan 22 and further disposed in front of the engine 21.
  • the boundary between the cab proximity guard opening 51 and the space inside the cab proximity guard 20 is indicated by a two-dot chain line (the same applies to the other boundaries).
  • the right connection duct 55 (guide part, accommodation guard side connection guide) is a duct communicating with the cab proximity guard opening 51.
  • the right connection duct 55 is disposed between the cab proximity guard 20 and the right side plate 13a.
  • the flow direction in the right connection duct 55 is the left direction.
  • the right connection duct 55 is disposed so as to connect the cab proximity guard opening 51 and the right side plate opening 59, and sound generated by the engine 21 is directed from the cab proximity guard opening 51 toward the right side plate opening 59. Guide the sound as it progresses.
  • the right side plate opening 59 (first receiving opening) is an opening formed in the right side plate 13a, and is a through-hole penetrating the right side plate 13a along the left-right direction.
  • the right side plate opening 59 is disposed at a position facing the cab proximity guard opening 51 in the left-right direction.
  • the right side plate opening 59 communicates with the right connection duct 55. Further, the right side plate opening 59 communicates with the cab proximity guard opening 51 through the right connection duct 55.
  • the right side plate opening 59 allows sound emitted through the cab proximity guard opening 51 to be received by the center section region A (internal space) of the center section 0 through the right side plate opening 59.
  • the right side plate opening 59 is preferably arranged as follows.
  • the position of the right side plate opening 59 is set so that the rigidity of the center section 10 in which the right side plate opening 59 is formed is not reduced as much as possible.
  • the position of the right side plate opening 59 is set to a position in the center section 10 where it is determined that the strain energy is small and no large stress is applied in the strain energy distribution. This determination is made based on the force line assumed from the strain energy distribution and the principal stress vector diagram obtained by, for example, structural analysis.
  • the center duct 60 (at least a part thereof) is a duct arranged so as to overlap the center section 10 when viewed along the vertical direction. More specifically, as shown in FIG. 2, the center duct 60 is disposed in a center section region A defined by the two side plates 13.
  • the center section region A is a region on the left side of the right end portion of the right side plate 13a and on the right side of the left end portion of the left side plate 13b. Further, the center section region A is a region on the rear side of the front side end portion of the side plate 13 and on the front side of the rear side end portion of the side plate 13.
  • the center section area A includes an inner area A1, an upper area A2, and a lower area A3, which are classified along the vertical direction.
  • the internal region A1 is a region sandwiched between the right end of the right side plate 13a and the left end of the left side plate 13b.
  • the upper region A2 is a region above the center section 10 (above the upper end portions of the right side plate 13a and the left side plate 13b).
  • the upper region A2 is a region above a winch (not shown) attached to the center section 10.
  • the lower area A3 is an area below the center section 10 and includes an area below the bottom plate 11.
  • the center duct 60 is disposed in at least one of the inner region A1, the upper region A2, and the lower region A3. In the example shown in FIG. 3, the center duct 60 is disposed in the lower portion of the internal region A1.
  • the center duct 60 may be arrange
  • the center duct 60 includes a straight portion 61a.
  • the straight portion 61a is a portion where the flow direction is a straight line (including a substantially straight line) (the same applies to the other straight lines described below). The straight portion 61a extends to the left side from the right side plate opening 59 and extends to a position on the right side of the left side plate 13b.
  • the center duct 60 may include a portion other than the straight portion 61a.
  • the center duct 60 is disposed so as to extend from the right side plate opening 59 to the internal space of the center section 10 and guides the progress of sound into the internal space.
  • the center duct 60 is, for example, a cylinder formed by joining a plurality of plates, and may be a hose. A part of the center duct 60 may also be used (shared) as a member constituting the center section 10.
  • the center duct 60 can be configured simply by using the members also. Specifically, the bottom surface (lower surface) of the center duct 60 can also be used as the bottom plate 11 (configured by the bottom plate 11).
  • the rigidity of the center section 10 can be increased by setting the plate thickness of a portion (plate) that does not serve as the center section 10 among members constituting the center duct 60 to be thick.
  • the sound inside the cab proximity guard 20 is transmitted as follows from the upstream side to the downstream side. Sound inside the cab proximity guard 20 enters the inside of the center duct 60 through the inside of the cab proximity guard opening 51 (inlet of the duct structure 40), the right side connection duct 55, and the right side plate opening 59. It is transmitted. This sound is radiated from the most downstream position of the center duct 60 (exit of the duct structure 40) to the inner area A1 of the center section area A (in other words, a position away from the cab 25). The sound inside the center duct 60 may be radiated to the upper area A2 and the lower area A3.
  • the cooling air exhaust path generated by the fan 22 is the same as the sound path described above.
  • the right connection duct 55 and the center duct 60 guide the sound through the cab proximity guard opening 51 and the right side plate opening 59 so that the sound travels from the cab proximity guard 20 to the internal space of the center section 10.
  • a sound absorbing material may be provided on part or all of the inner surface of the duct structure 40. In this case, the sound passing through the inside of the duct structure 40 is absorbed by the sound absorbing material. As a result, the sound transmitted to the cab 25 is further reduced. If rain or the like can enter the center duct 60, it is desirable that no sound absorbing material be provided inside the center duct 60. When a sound absorbing material is provided, a member that covers the upper portion of the center duct 60 may be disposed in order to prevent rain from entering.
  • the upper swing body 1A shown in FIG. 1 has the following effects.
  • the upper swing body 1 ⁇ / b> A includes a center section 10, a cab proximity guard 20, a cab 25, and a duct structure 40.
  • the center section 10 has a plurality of side plates 13 facing each other along the left-right direction.
  • the cab proximity guard 20 is disposed on the right side or the left side of the center section 10 and accommodates the engine 21.
  • the cab 25 is disposed in front of or behind the cab proximity guard 20.
  • the duct structure 40 includes a cab proximity guard opening 51 and a center duct 60.
  • the cab proximity guard opening 51 is an opening formed in the cab proximity guard 20. Further, the center duct 60 communicates with the cab proximity guard opening 51 substantially. For this reason, the sound inside the cab proximity guard 20 is transmitted to the inside of the center duct 60. Moreover, in this embodiment, the center duct 60 is arrange
  • FIG. 24 shows a conventional upper swing body 601.
  • an opening 651 is formed in the cab proximity guard 20.
  • the opening 651 is, for example, an exhaust port for discharging the exhaust of the fan 22 or an intake port. From this opening 651, the sound emitted by the noise source (engine 21 and fan 22) inside the cab proximity guard 20 is radiated.
  • the sound radiated from the opening 651 propagates directly to the cab 25, for example.
  • multiple reflection of sound may occur as follows.
  • the sound radiated from the opening 651 is subjected to multiple reflections between the right side plate 13a and the cab proximity guard 20 facing each other in the left-right direction.
  • the sound radiated from the opening 651 is subjected to multiple reflections between the right side plate 13 a and the cab 25. As a result, sound is transmitted into the cab 25, and, for example, comfort in the cab 25 is reduced.
  • the sound inside the cab proximity guard 20 is transmitted to the center section region A through the duct structure 40, and thus is difficult to be transmitted to the cab 25. Therefore, the noise in the cab 25 can be suppressed.
  • the duct structure 40 includes a right connection duct 55 that allows the cab proximity guard opening 51 and the center duct 60 to communicate with each other. For this reason, it is difficult for sound to leak from the inside of the duct structure 40 to the outside between the cab proximity guard opening 51 and the center duct 60. Therefore, the noise in the cab 25 can be further suppressed.
  • the cab proximity guard opening 51 is disposed on the cab 25 side (front side) (between the engine 21 and the cab 25) with respect to the engine 21.
  • the duct structure 40 when the duct structure 40 is not provided, sound is more easily transmitted from the cab proximity guard opening 51 to the cab 25 as the position of the opening 651 is closer to the cab 25 (front side).
  • the upper swing body 1 ⁇ / b> A of the present embodiment includes a duct structure 40. Therefore, when the cab proximity guard opening 51 is at a position close to the cab 25, specifically, even when the cab proximity guard opening 51 is on the front side of the engine 21, noise in the cab 25 can be reliably suppressed.
  • the duct structure 40 includes a right outer opening 43 (cab proximity guard side outer opening) and a right duct 45 (guide portion, housing guard inner guide).
  • the configuration of the center duct 60 is different from that of the first embodiment.
  • the duct structure 40 further includes a right connection duct-like structure 155-2 (accommodating guard side connection duct-like structure).
  • the right external opening 43 is an opening formed in the cab proximity guard 20, is provided separately from the cab proximity guard opening 51, and is disposed at a position different from the cab proximity guard opening 51.
  • the right external opening 43 allows the inside and outside of the cab proximity guard 20 to communicate with each other.
  • the right external opening 43 allows the right duct 45 to communicate with the outside of the cab proximity guard 20.
  • the right external opening 43 is preferably provided at a position far from the cab 25 in the cab proximity guard 20, and is disposed, for example, at the rear portion and at the rear side surface.
  • the right outer opening 43 may be disposed on the right side surface or the left side surface of the cab proximity guard 20.
  • the right duct 45 is a duct arranged so as to extend from the cab proximity guard opening 51 into the cab proximity guard 20.
  • the inlet of the duct structure 40 is the cab proximity guard opening 51, but in this modified embodiment shown in FIG. 4, the inlet of the duct structure 40 is the most upstream of the right duct 45. Side position.
  • the right duct 45 communicates with the cab proximity guard opening 51.
  • the flow direction in the right duct 45 is the left direction and is linear.
  • the flow direction in the right duct 45 may be bent (similar to the bent portion 162a described below).
  • the right duct 45 guides the sound so that the sound generated by the engine 21 travels from the cab proximity guard opening 51 toward the right side plate opening 59.
  • the center duct 60 includes a bent portion 162a and a straight portion 162b, as shown in FIG. 4, instead of the straight portion 61a of the first embodiment shown in FIG.
  • the bent portion 162a is a portion where the flow direction is bent (changes) (the same applies to the other bent portions described below).
  • a sound reduction effect is obtained at a portion where the flow direction is bent, such as the bent portion 162a. The more the part where the flow direction bends, the greater the sound reduction effect due to the bend.
  • the bent portion 162a is disposed in the vicinity of the right side plate opening 59 and bends the flow direction from the left to the rear.
  • the straight portion 162b extends rearward from the bent portion 162a.
  • the most downstream position of the straight portion 162b is the outlet of the duct structure 40.
  • the right side surface of the straight portion 162b is defined by the right side plate 13a.
  • the right connection duct-like structure 155-2 (accommodating guard-side connection duct-like structure) is provided around the position of the right connection duct 55 (see FIG. 1) in the first embodiment.
  • the right connection duct-like structure 155-2 is a duct-like structure constituted by a cab proximity guard opening 51 (upstream part) and a right side plate opening 59 (downstream part) arranged so as to communicate substantially spatially. .
  • the right connection duct-like structure 155-2 allows the cab proximity guard opening 51 and the center duct 60 to communicate with each other substantially.
  • the duct-like structure means that the upstream part and the downstream part are spatially large enough to transmit at least part of the acoustic energy from the upstream part (cab proximity guard opening 51) to the downstream part (right side plate opening 59).
  • This is a continuous structure.
  • the “at least part” of the “at least part of acoustic energy” is, for example, 25% or more.
  • the duct structure 40 includes a right connection duct-like structure 155-2 that allows the cab proximity guard opening 51 and the center duct 60 to substantially communicate spatially. For this reason, even if the right connection duct 55 (see FIG. 1) is not provided, the center duct through the downstream portion (the right side plate opening 59) from the upstream portion (cab proximity guard opening 51) of the right connection duct-like structure 155-2. 60). Therefore, the noise of the cab 25 can be suppressed.
  • the duct structure 40 includes a right duct 45.
  • the right duct 45 is disposed inside the cab proximity guard 20 and communicates with the cab proximity guard opening 51. For this reason, the sound inside the cab proximity guard 20 is reduced by the right duct 45 and further reduced by the center duct 60. Therefore, compared with the case where the right duct 45 is not provided, noise in the cab 25 can be further suppressed.
  • the center duct 60 includes a bent portion 162a and a straight portion 162b, which are the same as those in the first modified embodiment. Furthermore, the center duct 60 includes a bent portion 163a and a straight portion 163b.
  • the bent portion 163a is disposed in the vicinity of the rear end portion of the straight portion 162b and bends the flow direction from the rear direction to the left direction.
  • the right side surface of the bent portion 163a is defined by the right side plate 13a.
  • the straight portion 163b extends to the left from the bent portion 163a.
  • the most downstream position of the straight portion 163b is the outlet of the duct structure 40, and is disposed on the right side of the left side plate 13b.
  • the center duct 60 includes a straight portion 61a similar to that of the first embodiment (see FIG. 1), as shown in FIG. Furthermore, the center duct 60 includes a bent portion 164a, an expansion / reduction portion 164b, and a straight portion 164c.
  • the bent portion 164a is disposed in the vicinity of the left end portion of the linear portion 61a and bends the flow direction from the left to the rear.
  • the expansion / contraction portion 164b is a portion where the cross-sectional area of the duct structure 40 as viewed along the flow direction changes, and is a portion where the cross-sectional area expands and contracts.
  • the expansion / contraction portion 164b is disposed on the rear side of the bent portion 164a.
  • the side surface on the outer side in the left-right direction of the expansion / reduction portion 164b is defined by the side plate 13.
  • the front side surface and the right side surface of the expansion / reduction portion 164b are also used as the straight portion 61a. As shown in FIG.
  • the expansion / contraction portion 164 b is also used as the connection member 15.
  • the connecting member 15 also used as the expansion / contraction part 164b is, for example, a connecting member 15 (see FIGS. 7 and 8) for reinforcing a support part of a gantry (not shown), and the vicinity (rear side) of the connecting member 15 The member 15 or the like.
  • the upstream end portion (inlet) and the downstream end portion (exit) of the expansion / contraction portion 164 b are configured by through holes formed in the connecting member 15.
  • the straight portion 164c extends rearward from the downstream end of the expansion / reduction portion 164b.
  • the downstream end of the straight portion 164 c is an outlet of the duct structure 40.
  • the straight portion 164c is omitted. In other embodiments, the straight portion 164c may not be provided.
  • the hydraulic hose 193 is disposed inside the duct structure 40 as shown in FIG.
  • the hydraulic hose 193 is disposed over the entire path from the inlet to the outlet of the duct structure 40.
  • the hydraulic hose 193 may be disposed only in a part of the path from the inlet to the outlet of the duct structure 40.
  • the hydraulic device to which the hydraulic hose 193 is connected is accommodated inside the cab proximity guard 20 (and the anti-cab side guard 30) (a large number of hydraulic devices may be accommodated).
  • an opening is required in the cab proximity guard 20. Therefore, the cab proximity guard opening 51 (see FIG.
  • the hydraulic hose 193 is disposed along the duct structure 40 so as to straddle at least between the cab proximity guard 20 and the center section 10.
  • an electric wire may be arranged inside the duct structure 40.
  • the electric wire is, for example, a bundle (wire harness), for example, for electric control, and may be for power supply, for example.
  • the electrical device to which the electric wire is connected is accommodated inside the cab proximity guard 20 (and the anti-cab side guard 30), as in the case of the hydraulic device described above (a large number of electrical devices may be accommodated).
  • the upper swing body 1D includes a hydraulic hose 193 or an electric wire disposed inside the duct structure 40 (hereinafter, “hydraulic hose 193 or electric wire” is referred to as “hydraulic hose 193”).
  • the duct structure 40 has a function as a path for passing the hydraulic hose 193 or the electric wire between the inside and outside of the cab proximity guard 20. For this reason, in the part in which the duct structure 40 is provided, it is not necessary to provide an opening (new opening) for passing the hydraulic hose 193 separately from the duct structure 40.
  • the right connection duct 155-5 (at least a part thereof) is disposed above the right side plate 13a.
  • the cab proximity guard opening 51 is disposed to face the right connection duct 155-5 in the left-right direction.
  • the right connection duct 155-5 includes a straight portion 155a and a bent portion 155b.
  • the straight portion 155a extends leftward from the cab proximity guard opening 51.
  • the bent portion 155b is disposed in the vicinity of the left end portion of the straight portion 155a, is disposed on the left side and above the right side plate 13a, and bends the flow direction from the left direction to the lower direction.
  • the center duct 60 includes a straight portion 165a, a bent portion 165b, and a straight portion 165c, unlike the first embodiment (see FIG. 1).
  • the straight portion 165a extends downward from the bent portion 155b.
  • the right side surface of the straight portion 165a is also used as the right side plate 13a.
  • the bent portion 165b is disposed in the vicinity of the lower end portion of the straight portion 165a and bends the flow direction from the lower direction to the left direction.
  • the lower surface of the bent portion 165b is also used as the bottom plate 11.
  • the straight line portion 165c extends leftward from the bent portion 165b.
  • the lower surface of the straight portion 165c is also used as the bottom plate 11.
  • the position of the downstream end portion of the straight portion 165 c is the outlet of the duct structure 40.
  • the right side plate opening 59 (see FIG. 1) is not provided in the right side plate 13a. Therefore, the rigidity of the right side plate 13a can be increased as compared with the case where the right side plate opening 59 is provided in the right side plate 13a.
  • a portion for bending the flow direction such as the bent portion 155b is required. For this reason, the pressure loss of the air (exhaust gas) flowing inside the duct structure 40 becomes larger than when it is not necessary to provide the bent portion 155b.
  • the cab proximity guard opening 151 is arranged as follows. In the fourth modified embodiment shown in FIG. 9 and the like, the cab proximity guard opening 51 is formed on the left side surface of the cab proximity guard 20. On the other hand, in this modified embodiment shown in FIG. 10, the cab proximity guard opening 151 is formed, for example, on the bottom surface (lower surface) of the cab proximity guard 20.
  • the right connection duct 155-6 (cab proximity guard side connection duct) is disposed below the right side plate 13a.
  • the right connection duct 155-6 includes a bent portion 155s, a straight portion 155t, and a bent portion 155u.
  • the bent portion 155s is disposed in the vicinity of the cab proximity guard opening 151, is disposed below the cab proximity guard opening 151, and bends the flow direction from the downward direction to the left direction.
  • the straight portion 155t extends to the left from the bent portion 155s.
  • the upper surface of the straight portion 155t is also used as the bottom plate 11.
  • the bent portion 155u is disposed in the vicinity of the left end portion of the straight portion 155t and bends the flow direction from the left to the upper.
  • the bottom plate opening 158 is an opening formed in the bottom plate 11 and is a through-hole penetrating the bottom plate 11 along the vertical direction.
  • the bottom plate opening 158 allows the right connection duct 155-6 and the center duct 60 to communicate with each other.
  • the center duct 60 includes a bent portion 166a.
  • the bent portion 166a is disposed in the vicinity of the bottom plate opening 158 and bends the flow direction from the upper direction to the left direction.
  • the upper swing body 201A includes a left side plate opening 271, a left side connection duct 275 (anti-cab side connection guide), and an anti cab side guard opening 279 (second receiving) that are not in the first embodiment. An opening).
  • the center duct 60 includes a straight portion 261a instead of the straight portion 61a (see FIG. 1) of the first embodiment.
  • the difference between the straight line portion 261a and the straight line portion 61a of the first embodiment is as follows. As shown in FIG. 1, the downstream end of the linear portion 61a of the first embodiment is disposed on the right side (center section region A) of the left side plate 13b. On the other hand, as shown in FIG. 11, the downstream end of the linear portion 261a of the present embodiment is connected to the left side plate 13b (left side plate opening 271).
  • the left side plate opening 271 (second discharge opening) is an opening formed in the left side plate 13b (position different from the right side plate opening 59), and is a through-hole penetrating the left side plate 13b along the left-right direction.
  • the left side plate opening 271 communicates with the center duct 60.
  • the left side plate opening 271 is preferably formed at a position where the rigidity of the center section 10 is not lowered as much as possible (similar to the right side plate opening 59).
  • the left side plate opening 271 allows sound to be emitted from the internal space of the center section 10 through the left side plate opening 271.
  • the left connection duct 275 (anti-cab side connection guide) is a duct that connects (connects) the anti-cab side guard opening 279 and the center duct 60.
  • the left connection duct 275 communicates with the left side plate opening 271.
  • the left connection duct 275 is disposed between the left side plate 13 b and the anti-cab side guard 30.
  • the flow direction in the left connection duct 275 is the left direction.
  • the left connection duct 275 guides the sound so that the sound travels from the left side plate opening 271 toward the anti-cab side guard opening 279.
  • the anti-cab side guard opening 279 is an opening formed in the anti-cab side guard 30 and is a through hole penetrating the right side wall of the anti-cab side guard 30 along the left-right direction.
  • the anti-cab side guard opening 279 is disposed at a position facing the left side plate 13b in the left-right direction.
  • the anti-cab side guard opening 279 communicates with the left connection duct 275.
  • the anti-cab side guard opening 279 communicates with the center duct 60 via the left connection duct 275 and the left side plate opening 271.
  • the anti-cab side guard opening 279 is the outlet of the duct structure 40. In FIG. 12, the left connection duct 275 and the anti-cab side guard opening 279 are omitted.
  • the anti-cab side guard opening 279 allows sound emitted through the left side plate opening 271 to be received inside the anti-cab side guard 30 through the anti-cab side guard opening 279.
  • the sound inside the cab proximity guard 20 shown in FIG. 11 (similar to exhaust) is transmitted in the following order from the upstream side to the downstream side. Similar to the first embodiment (see FIG. 1), the sound inside the cab proximity guard 20 is transmitted to the inside of the center duct 60. This sound is transmitted to the inside of the anti-cab side guard 30 through the inside of the left side plate opening 271, the inside of the left side connection duct 275, and the inside of the anti cab side guard opening 279. At this time, the right connection duct 55, the center duct 60, and the left connection duct 275 pass through the cab proximity guard 20 through the cab proximity guard opening 51, the right side plate opening 59, the left side plate opening 271 and the anti-cab side guard opening 279. The sound is guided so as to travel into the internal space of the section 10 and further into the anti-cab side guard 30.
  • the sound passing through the duct structure 40 is reduced by distance attenuation.
  • the sound reduction effect due to distance attenuation can be increased. Sound radiated from the inside of the duct structure 40 to the inside of the anti-cab side guard 30 is reduced by diffraction attenuation. Sound radiated from the inside of the anti-cab side guard 30 through the gap of the anti-cab side guard 30 to the outside of the anti-cab side guard 30 is reduced by diffraction attenuation.
  • a sound absorbing material may be provided inside (for example, the inner surface of) the anti-cab side guard 30. In this case, the sound inside the anti-cab side guard 30 is absorbed by the sound absorbing material. As a result, the sound transmitted to the cab 25 is further reduced.
  • the upper turning body 201A shown in FIG. 11 has the following effects.
  • the upper swing body 201 ⁇ / b> A includes an anti-cab side guard 30.
  • the anti-cab side guard 30 is arranged on the side (left side) opposite to the side (right side) where the cab proximity guard 20 and the cab 25 are arranged with respect to the center section 10.
  • the duct structure 40 includes an anti-cab side guard opening 279.
  • the anti-cab side guard opening 279 is an opening formed in the anti-cab side guard 30 and communicates with the center duct 60. For this reason, the sound inside the cab proximity guard 20 is transmitted to the inside of the anti-cab side guard 30 via the duct structure 40. Therefore, the duct structure 40 can transmit sound to a position where the distance in the left-right direction from the cab 25 is farther (for example, a position farther than the center section 10). Therefore, the noise in the cab 25 can be further suppressed.
  • the duct structure 40 includes a left connection duct 275 that allows the center duct 60 and the anti-cab side guard opening 279 to communicate with each other. For this reason, it is difficult for sound to leak from the inside of the duct structure 40 to the outside between the anti-cab side guard opening 279 and the center duct 60. Therefore, the noise in the cab 25 can be further suppressed.
  • the center duct 60 includes a bent portion 162a, a straight portion 162b, and a bent portion 163a, which are the same as those in the second modified embodiment (see FIG. 5). Further, the center duct 60 includes a straight portion 262a. The straight portion 262a extends leftward from the bent portion 163a. The downstream end of the straight portion 262a is connected to the left side plate 13b (left side plate opening 271).
  • the center duct 60 includes a linear portion 61a, a bent portion 164a, and an expansion / reduction portion 164b similar to those of the third modified embodiment (see FIG. 6). Furthermore, the center duct 60 includes a bent portion 263a and a straight portion 263b.
  • the bent portion 263a is disposed in the vicinity of the rear end portion of the expansion / reduction portion 164b and bends the flow direction from the rear direction to the left direction.
  • the straight portion 263b extends leftward from the bent portion 263a.
  • the downstream end of the straight line portion 263b is connected to the left side plate 13b (left side plate opening 271).
  • the front and left side surfaces of the straight portion 263b are also used as the expansion / contraction portion 164b.
  • the outlet of the duct structure 40 is disposed in the anti-cab side guard opening 279 in the second embodiment illustrated in FIG. 11, but is disposed in the anti-cab side guard 30 in the present embodiment illustrated in FIG. 15.
  • the duct structure 40 includes a left connection duct-like structure 375 (an anti-cab side connection duct-like structure).
  • the upper swing body 301A includes a left duct 380 (an anti-cab side guard internal guide).
  • the left connection duct-like structure 375 is provided around the position of the left connection duct 275 (see FIG. 11) in the second embodiment. As shown in FIG. 15, the left connection duct-like structure 375 includes a left side plate opening 271 (upstream part) and an anti-cab side guard opening 279 (downstream part) arranged so as to be substantially spatially communicated. It is a duct-like structure. The left connection duct-like structure 375 makes the center duct 60 and the anti-cab side guard opening 279 substantially communicate spatially.
  • the left duct 380 is a duct disposed so as to extend from the anti-cab side guard opening 279 to the inside of the anti-cab side guard 30.
  • the left duct 380 communicates with the anti-cab side guard opening 279.
  • the left duct 380 guides the progress of sound into the anti-cab side guard 30.
  • the left duct 380 includes a bent portion 381a, a straight portion 381b, and a bent portion 381c.
  • the bent portion 381a is disposed in the vicinity of the anti-cab side guard opening 279 and bends the flow direction from the left to the rear.
  • the straight portion 381b extends rearward from the bent portion 381a.
  • a part of the left duct 380 is also used as a member constituting the anti-cab side guard 30.
  • the right surface of the straight portion 381b is also used as the right surface (side surface) of the anti-cab side guard 30 (the same applies to the right surface of the bent portion 381c).
  • the bent portion 381c is disposed in the vicinity of the rear end portion of the straight portion 381b and bends the flow direction from the rear direction to the left direction.
  • the downstream end of the bent portion 381 c is an outlet of the duct structure 40.
  • the left connection duct 275 and the anti-cab side guard opening 279 shown in FIG. 15 are omitted.
  • the duct structure 40 includes a left connection duct-like structure 375 that substantially communicates the center duct 60 and the anti-cab side guard opening 279 in space. For this reason, even if the left connection duct 275 (see FIG. 11) is not provided, the upstream portion (center duct 60 via the left side plate opening 271) to the downstream portion (anti-cab side guard opening 279) of the left connection duct-like structure 375. ). Therefore, the noise of the cab 25 can be suppressed.
  • the upper swing body 401A of the fourth embodiment of the present invention With reference to FIG. 17, a difference between the upper swing body 401A of the fourth embodiment of the present invention and the previous third embodiment (see FIG. 15) will be described.
  • the difference is the configuration of the center duct 60, the configuration of the left duct 380, and the position of the outlet of the duct structure 40.
  • the position of the outlet of the duct structure 40 is inside the anti-cab side guard 30, but in the fourth embodiment shown in FIG. 17, a position communicating with the outside of the anti-cab side guard 30.
  • the upper swing body 401A includes a left outer opening 490 (third discharge opening).
  • the center duct 60 includes a straight portion 461a, a bent portion 461b, a straight portion 461c, and a bent portion 461d instead of the straight portion 261a (see FIG. 15) of the third embodiment.
  • the straight line portion 461a is configured in substantially the same manner as the straight line portion 61a (see FIG. 1) of the first embodiment.
  • the difference between the straight line part 461a and the straight line part 61a (see FIG. 1) is that the downstream end of the straight line part 461a is not the outlet of the duct structure 40.
  • the bent portion 461b is disposed in the vicinity of the left end portion of the straight portion 461a and bends the flow direction from the left to the rear.
  • the left side surface of the bent portion 461b is also used as the left side plate 13b (the same applies to the left side surface of the straight portion 461c).
  • the straight line portion 461c extends rearward from the bent portion 461b.
  • the bent portion 461d is disposed in the vicinity of the rear end portion of the straight portion 461c, bends the flow direction from the rear direction to the left direction, and is connected to the left side plate 13b.
  • the left duct 380 includes a straight portion 481a.
  • the straight portion 481 a extends leftward from the anti-cab side guard opening 279 and is connected to the left side surface (side surface) of the anti-cab side guard 30.
  • the left external opening 490 (third discharge opening) is an opening formed in the anti-cab side guard 30.
  • the left outer opening 490 is disposed on the left side surface (side surface) of the anti-cab side guard 30, and is disposed, for example, in a lower portion (for example, near the lower end portion) of the anti-cab side guard 30.
  • the left external opening 490 allows the left duct 380 to communicate with the outside of the anti-cab side guard 30 (the outside of the upper swing body 401A).
  • the left outer opening 490 is provided separately from the anti-cab side guard opening 279 (disposed at a different position).
  • the left outer opening 490 allows sound to be emitted from the left duct 380 to the outside of the anti-cab side guard 30 through the left outer opening 490.
  • Sound inside the cab proximity guard 20 (similar to exhaust) is transmitted in the following order from the upstream side to the downstream side. Similar to the second embodiment (see FIG. 11), the sound inside the cab proximity guard 20 is transmitted to the inside of the anti-cab side guard opening 279. This sound is transmitted (radiated) to the outside of the anti-cab side guard 30 (outside the upper swing body 401A) through the inside of the left duct 380 and the inside of the left external opening 490. Further, similarly to this sound, the cooling air generated by the fan 22 is exhausted to the outside of the upper swing body 401A.
  • the right connection duct 55, the center duct 60, the left connection duct 275, and the left duct 380 pass through the cab proximity guard opening 51, the right side plate opening 59, the left side plate opening 271, the anti-cab side guard opening 279, and the left external opening 490.
  • the sound is guided so that the sound travels from the cab proximity guard 20 to the inner space of the center section 10, the inside of the anti-cab side guard 30, and the outside of the anti-cab side guard 30.
  • the upper swing body 401A shown in FIG. 17 has the following effects.
  • the duct structure 40 includes a left duct 380 and a left external opening 490.
  • the left duct 380 is disposed inside the anti-cab side guard 30 and communicates with the anti-cab side guard opening 279.
  • the left outer opening 490 is an opening formed in the anti-cab side guard 30 and is provided separately from the anti-cab side guard opening 279 and communicates the left duct 380 and the outside of the anti-cab side guard 30.
  • the noise inside the cab proximity guard 20 is transmitted to the outside of the anti-cab side guard 30 through the inside of the left duct 380 and the left outside opening 490. Therefore, the duct structure 40 can transmit sound to a position where the distance in the left-right direction from the cab 25 is farther (for example, a position farther than the center section region A). Therefore, the noise in the cab 25 can be further suppressed.
  • the left duct 380 includes a bent portion 482a, a straight portion 482b, a bent portion 482c, and a straight portion 482d instead of the straight portion 481a (see FIG. 17) of the fourth embodiment.
  • the bent portion 482a is disposed in the vicinity of the anti-cab side guard opening 279 and bends the flow direction from the left to the rear.
  • the straight portion 482b extends rearward from the bent portion 482a. Unlike the straight line portion 381b (see FIG. 15) of the third embodiment, the right side surface of the straight line portion 482b is not used as the left side plate 13b.
  • the bent portion 482c is provided in the vicinity of the rear end portion of the straight portion 482b and bends the flow direction from the rear direction to the left direction.
  • the straight portion 482d extends to the left from the bent portion 482c.
  • the downstream end of the straight portion 482d is connected to the left side surface of the anti-cab side guard 30 and communicates with the left external opening 490.
  • the left duct 380 includes a straight portion 483a, a bent portion 483b, a straight portion 483c, and a bent portion 483d shown in FIG. 20 instead of the straight portion 481a (see FIG. 17) of the fourth embodiment.
  • the straight portion 483a is configured in substantially the same manner as the straight portion 481a (see FIG. 17) of the fourth embodiment.
  • the downstream end part of the straight line part 483a is not directly connected to the left external opening 490.
  • the bent portion 483b is disposed in the vicinity of the left end portion of the linear portion 483a, and bends the flow direction from the left direction to the upward direction.
  • the left side surface of the bent portion 483b is also used as the left side surface of the anti-cab side guard 30 (the same applies to the left side surface of the straight portion 483c).
  • the straight portion 483c extends upward from the bent portion 483b.
  • the bent portion 483d is disposed in the vicinity of the upper end portion of the linear portion 483c, bends the flow direction from the upper direction to the left direction, and is connected to the left side surface of the anti-cab side guard 30.
  • the upper surface of the bent portion 483d is also used as the upper surface of the anti-cab side guard 30.
  • the left outer opening 490 is disposed, for example, in the vicinity of the upper end portion of the anti-cab side guard 30 and communicates with the bent portion 483d.
  • the left duct 380 includes a bent portion 484a, a straight portion 484b, a bent portion 484c, and a straight portion 484d instead of the straight portion 481a (see FIG. 17) of the fourth embodiment.
  • the bent portion 484a is disposed in the vicinity of the anti-cab side guard opening 279 and bends the flow direction from the left to the front.
  • the straight portion 484b extends forward from the bent portion 484a.
  • the right side surface of the straight portion 484b is also used as the right side surface of the anti-cab side guard 30 (the same applies to the right side surface of the bent portion 484c).
  • the bent portion 484c is disposed in the vicinity of the front end portion of the straight portion 484b and bends the flow direction from the front direction to the left direction.
  • the straight portion 484d extends to the left from the bent portion 484c.
  • the downstream end of the straight portion 484d is connected to the left surface of the anti-cab side guard 30 and communicates with the left external opening 490.
  • auxiliary ventilation device 595 is a device that assists the air inside the duct structure 40 to flow easily.
  • the auxiliary ventilation device 595 allows air (exhaust) inside the duct structure 40 to flow (discharge) smoothly even when the pressure loss inside the duct structure 40 is large.
  • the auxiliary ventilation device 595 is specifically a fan (a fan different from the fan 22).
  • the auxiliary ventilation device 595 is a sound source and may affect the increase in noise in the cab 25.
  • the auxiliary ventilation device 595 is preferably arranged at a position far from the cab 25. Specifically, the auxiliary ventilation device 595 is disposed inside the left duct 380, and is disposed, for example, at a left portion (for example, an end portion) of the left duct 380, and is disposed at, for example, the bent portion 483b.
  • auxiliary ventilation device 595 is provided.
  • the auxiliary ventilation device 595 is arranged inside the center duct 60, and is arranged, for example, inside the expansion / contraction part 164b.
  • the above embodiments may be variously modified. Components in different forms may be combined.
  • the right duct 45 of the first modified embodiment may be added to the first embodiment (see FIG. 1).
  • the right connection duct 55 of the first embodiment may be replaced with a right connection duct-like structure 155-2 (see FIG. 4).
  • the number and arrangement of the constituent elements of each of the above forms may be changed. For example, the number of the side plates 13 shown in FIG. Moreover, a part of component of said each form does not need to be provided (below).
  • the configuration of the duct structure 40 may be changed as follows.
  • the position of the inlet of the duct structure 40, the position of the outlet, the length, the shape, and the like may be changed. Whether or not the duct structure 40 is shared with other members may be changed.
  • the number of paths from the inlet to the outlet of the duct structure 40 may be one or a plurality, for example, may be branched or merged.
  • the duct structure 40 may have one or more inlets (the same applies to the outlets).
  • the cross-sectional shape of the duct structure 40 may be constant (for example, rectangular) from the inlet to the outlet, or may change in the middle of the path.
  • the duct structure 40 is an exhaust duct in each of the above embodiments, but may be an intake duct (the inlet of the duct structure 40 may be an intake port). More specifically, air (intake air) before being sucked into the fan 22 may flow inside the duct structure 40. The cooling air generated by the fan 22 does not have to flow inside the duct structure 40. The direction in which the sound is transmitted inside the duct structure 40 and the direction in which the cooling air generated by the fan 22 flows may be the same or opposite.
  • a duct such as the center duct 60 may have a small opening or a gap.
  • the right connection duct 55 may not be provided.
  • the left connection duct 275 may not be provided.
  • the right connection duct 55 is closer to the cab 25 than the left connection duct 275. Therefore, compared with the case where the right connection duct 55 is not provided and the left connection duct 275 is provided, the noise of the cab 25 can be suppressed when the left connection duct 275 is not provided and the right connection duct 55 is provided.
  • the position and number of the expansion / reduction unit 164b may be changed.
  • the expansion / contraction part 164b is provided in the center section 10 in the above embodiment, but may be provided in the anti-cab side guard 30.
  • the left connection duct 275 (see FIG. 11) is arranged above and below the left side plate 13b, like the right connection duct 155-5 (see FIG. 9) and the right connection duct 155-6 (see FIG. 10). Also good.
  • the position and number of auxiliary ventilation devices 595 may be changed.
  • the propagation part which concerns on this invention is not limited to a thing provided with a duct structure like the duct structure 40.
  • a propagation part may be formed so that a sound may advance between a pair of plate-like members arranged at intervals.
  • the propagation portion may include only the cab proximity guard opening 51 and the right side plate opening 59 and may not include the right connection duct 55 and the center duct 60.
  • the sound emitted by the engine 21 can be propagated from the cab proximity guard 20 into the center section 10.
  • the right side plate opening 59 is not limited to the one that is disposed at a position that opposes the cab proximity guard opening 51 in the left-right direction, and the sound emitted by the engine 21 passes between the two. Any other form may be used.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

An upper rotating body for a construction machine is configured so as to suppress noise within a cab. An upper rotating body 1A is provided with a duct structure 40. The duct structure 40 is provided with a cab proximity guard opening 51 and a right side plate opening 59. The cab proximity guard opening 51 and the right side plate opening 59 are openings respectively formed in a cab proximity guard 20 and a right side plate 13a. The duct structure 40 guides the propagation of sound from the cab proximity guard 20 to a center section 60.

Description

建設機械の上部旋回体Upper swing body of construction machinery
　本発明は、建設機械の上部旋回体に関する。 The present invention relates to an upper swing body of a construction machine.
　例えば特許文献１、２などに、従来の建設機械の上部旋回体が記載されている。特許文献１に記載の上部旋回体では、キャブの後側のエンジン室の内面に、吸音材が設けられる。また、特許文献２に記載の上部旋回体では、ブームとキャブとが対向する部分に、吸音材が設けられる。これらの吸音材により、キャブ内の騒音抑制が図られている。 For example, Patent Documents 1 and 2 describe an upper rotating body of a conventional construction machine. In the upper-part turning body described in Patent Document 1, a sound absorbing material is provided on the inner surface of the engine chamber on the rear side of the cab. Further, in the upper swing body described in Patent Document 2, a sound absorbing material is provided in a portion where the boom and the cab face each other. Noise suppression in the cab is achieved by these sound absorbing materials.
特開２００７－２１７１５０号公報JP 2007-217150 A 特開２０１１－２５１８２４号公報JP 2011-251824 A
　吸音材の中で一般的によく用いられる、多孔質材料による吸音材の２００Ｈｚ以下の低周波領域における吸音率は不十分である。また、低周波領域においては、キャブ内空間固有の共鳴現象が起こりやすい。そのため、特許文献１、２に記載の技術では、キャブ内の騒音を十分に抑制できないおそれがある。そのため、より一層のキャブ内騒音の低減が求められる。 The sound absorption coefficient in a low frequency region of 200 Hz or lower of a sound absorbing material made of a porous material, which is generally used among sound absorbing materials, is insufficient. Further, in the low frequency region, a resonance phenomenon specific to the cab space tends to occur. Therefore, the techniques described in Patent Documents 1 and 2 may not sufficiently suppress noise in the cab. Therefore, further reduction in cab noise is required.
　そこで本発明は、キャブ内の騒音を抑制できる、建設機械の上部旋回体を提供することを目的とする。 Therefore, an object of the present invention is to provide an upper rotating body of a construction machine that can suppress noise in the cab.
　本発明の建設機械の上部旋回体は、センターセクションと、騒音源収容ガードと、キャブと、伝播部と、を備える。センターセクションは、左右方向において互いに対向して配置され、前後方向に沿って延びる複数の側板を有し、前記複数の側板の間に内部空間が形成されている。騒音源収容ガードは、前記センターセクションの右側または左側に配置され、内部に騒音源を収容する。キャブは、前記騒音源収容ガードの前側または後側に配置される。伝播部は、前記騒音源が発生する音を前記騒音源収容ガードの内部から前記センターセクションの前記内部空間に伝播させる。伝播部は、第１放出開口部と、第１受入開口部と、を備える。第１放出開口部は、前記騒音源収容ガードに開口された第１放出開口部であって、当該第１放出開口部を通じて前記騒音源収容ガードの内部から前記音が放出されることを許容する。第１受入開口部は、前記センターセクションに開口された第１受入開口部であって、前記第１放出開口部を通じて放出された前記音が前記第１受入開口部を通じて前記内部空間に受け入れられることを許容する。 The upper turning body of the construction machine of the present invention includes a center section, a noise source accommodation guard, a cab, and a propagation part. The center section is disposed to face each other in the left-right direction, has a plurality of side plates extending in the front-rear direction, and an internal space is formed between the plurality of side plates. The noise source accommodation guard is disposed on the right side or the left side of the center section and accommodates the noise source therein. The cab is disposed on the front side or the rear side of the noise source accommodation guard. The propagation unit propagates the sound generated by the noise source from the inside of the noise source accommodation guard to the internal space of the center section. The propagation part includes a first discharge opening and a first receiving opening. The first emission opening is a first emission opening opened in the noise source accommodation guard, and allows the sound to be emitted from the inside of the noise source accommodation guard through the first emission opening. . The first receiving opening is a first receiving opening opened in the center section, and the sound emitted through the first discharge opening is received in the internal space through the first receiving opening. Is acceptable.
　上記構成により、キャブ内の騒音を抑制できる。 With the above configuration, noise in the cab can be suppressed.
本発明の第１実施形態に係る上部旋回体１Ａを上から見た断面図である。It is sectional drawing which looked at the upper turning body 1A which concerns on 1st Embodiment of this invention from the top. 図１の上部旋回体１Ａのセンターセクション領域Ａなどを示す、上から見た断面図である。It is sectional drawing seen from the top which shows the center section area | region A etc. of the upper turning body 1A of FIG. 図２の上部旋回体１ＡのＦ３－Ｆ３矢視断面図である。FIG. 3 is a cross-sectional view of the upper swing body 1A of FIG. 本発明の第１変形実施形態に係る上部旋回体１Ｂを上から見た断面図である。It is sectional drawing which looked at the upper turning body 1B which concerns on 1st deformation | transformation embodiment of this invention from the top. 本発明の第２変形実施形態に係る上部旋回体１Ｃを上から見た断面図である。It is sectional drawing which looked at the upper turning body 1C which concerns on 2nd deformation | transformation embodiment of this invention from the top. 本発明の第３変形実施形態に係る上部旋回体１Ｄを上から見た断面図である。It is sectional drawing which looked at upper revolving body 1D concerning the 3rd modification of the present invention from the top. 図６の上部旋回体１ＤのＦ７－Ｆ７矢視断面図である。FIG. 7 is a cross-sectional view taken along arrow F7-F7 of the upper swing body 1D of FIG. 図６の上部旋回体１Ｄの断面斜視図である。It is a cross-sectional perspective view of upper revolving unit 1D of FIG. 本発明の第４変形実施形態に係る上部旋回体１Ｅを前側Ｘ１から見た断面図である。It is sectional drawing which looked at the upper turning body 1E which concerns on 4th modification embodiment of this invention from the front side X1. 本発明の第５変形実施形態に係る上部旋回体１Ｆを前側Ｘ１から見た断面図である。It is sectional drawing which looked at the upper turning body 1F which concerns on 5th modification embodiment of this invention from the front side X1. 本発明の第２実施形態に係る上部旋回体２０１Ａを上から見た断面図である。It is sectional drawing which looked at the upper turning body 201A which concerns on 2nd Embodiment of this invention from the top. 図１１の上部旋回体２０１Ａの断面斜視図である。It is a cross-sectional perspective view of the upper swing body 201A of FIG. 本発明の第６変形実施形態に係る上部旋回体２０１Ｂを上から見た断面図である。It is sectional drawing which looked at the upper turning body 201B which concerns on 6th modification embodiment of this invention from the top. 本発明の第７変形実施形態に係る上部旋回体２０１Ｃを上から見た断面図である。It is sectional drawing which looked at the upper turning body 201C which concerns on 7th modification embodiment of this invention from the top. 本発明の第３実施形態に係る上部旋回体３０１Ａを上から見た断面図である。It is sectional drawing which looked at the upper turning body 301A which concerns on 3rd Embodiment of this invention from the top. 図１５の上部旋回体３０１Ａの断面斜視図である。It is a cross-sectional perspective view of the upper swing body 301A of FIG. 本発明の第４実施形態に係る上部旋回体４０１Ａを上から見た断面図である。It is sectional drawing which looked at the upper turning body 401A which concerns on 4th Embodiment of this invention from the top. 本発明の第８変形実施形態に係る上部旋回体４０１Ｂを上から見た断面図である。It is sectional drawing which looked at the upper turning body 401B which concerns on 8th modification embodiment of this invention from the top. 本発明の第９変形実施形態に係る上部旋回体４０１Ｃを上から見た断面図である。It is sectional drawing which looked at the upper turning body 401C which concerns on 9th modification embodiment of this invention from the top. 図１９に示す上部旋回体４０１Ｃの左側ダクト３８０を示す斜視図である。FIG. 20 is a perspective view showing a left duct 380 of the upper swing body 401C shown in FIG. 本発明の第１０変形実施形態に係る上部旋回体４０１Ｄを上から見た断面図である。It is sectional drawing which looked at upper revolving body 401D concerning the 10th modification of the present invention from the top. 本発明の第５実施形態に係る上部旋回体５０１Ａを上から見た断面図である。It is sectional drawing which looked at the upper turning body 501A which concerns on 5th Embodiment of this invention from the top. 本発明の第１１変形実施形態に係る上部旋回体５０１Ｂを上から見た断面図である。It is sectional drawing which looked at the upper turning body 501B which concerns on 11th deformation | transformation embodiment of this invention from the top. 図１に示すダクト構造４０を備えない上部旋回体を上から見た断面図である。It is sectional drawing which looked at the upper turning body which is not provided with the duct structure 40 shown in FIG. 1 from the top.
　（第１実施形態）
　図１を参照して、本発明の第１実施形態に係る上部旋回体１Ａについて説明する。 (First embodiment)
With reference to FIG. 1, an upper swing body 1A according to a first embodiment of the present invention will be described.
　上部旋回体１Ａは、建設機械の構成要素である。上部旋回体１Ａが設けられる建設機械は、例えばクレーンであり、詳しくは移動式クレーンである。他の実施形態において、建設機械は、ショベル（例えば油圧ショベル）でもよい。上部旋回体１Ａは、下部走行体（図示なし）に対して旋回可能に、下部走行体の上に搭載される。この下部走行体は、例えばクローラ式であり、ホイール式でもよい。上部旋回体１Ａは、センターセクション１０と、キャブ近接ガード２０（騒音源収容ガード）と、キャブ２５と、反キャブ側ガード３０と、ダクト構造４０（伝播部）と、を備える。 The upper swing body 1A is a component of the construction machine. The construction machine provided with the upper swing body 1A is, for example, a crane, and more specifically a mobile crane. In other embodiments, the construction machine may be an excavator (eg, a hydraulic excavator). The upper swing body 1A is mounted on the lower travel body so as to be turnable with respect to the lower travel body (not shown). The lower traveling body is, for example, a crawler type and may be a wheel type. The upper swing body 1A includes a center section 10, a cab proximity guard 20 (noise source accommodation guard), a cab 25, an anti-cab side guard 30, and a duct structure 40 (propagation unit).
　センターセクション１０（旋回フレーム）は、下部走行体に取り付けられ、上部旋回体１Ａの中央部に設けられる。センターセクション１０には、センターセクション１０を挟むように、キャブ近接ガード２０および反キャブ側ガード３０が取り付けられる（固定される）。センターセクション１０には、キャブ２５が取り付けられる。なお、図１に示すように、上部旋回体１Ａに板状のベース部分１００が備えられ、当該ベース部分１００に、センターセクション１０、キャブ近接ガード２０、反キャブ側ガード３０およびキャブ２５がそれぞれ固定されてもよい。ここで、図１を含む各図面では、各実施形態に係る上部旋回体の説明のために、「前後」、「左右」および「上下」などの方向を示しているが、当該方向は、本発明に係る上部旋回体の動作や使用態様を限定するものではない。なお、図１では、センターセクション１０の長手方向が前後方向に沿うように、更に、センターセクション１０の幅方向が左右方向に沿うように、センターセクション１０が配置されている。本実施形態では、図１において、キャブ近接ガード２０がキャブ２５の後側に配置されているが、キャブ近接ガード２０はキャブ２５の前側に配置されてもよい。キャブ近接ガード２０はセンターセクション１０の右側に配置されているが、キャブ近接ガード２０はセンターセクション１０の左側に配置されてもよい。 The center section 10 (swivel frame) is attached to the lower traveling body and provided at the center of the upper swing body 1A. The cab proximity guard 20 and the anti-cab side guard 30 are attached (fixed) to the center section 10 so as to sandwich the center section 10. A cab 25 is attached to the center section 10. As shown in FIG. 1, a plate-like base portion 100 is provided on the upper swing body 1A, and the center section 10, the cab proximity guard 20, the anti-cab side guard 30 and the cab 25 are fixed to the base portion 100, respectively. May be. Here, in each drawing including FIG. 1, directions such as “front and rear”, “left and right”, and “up and down” are shown for explanation of the upper swing body according to each embodiment. The operation and usage mode of the upper swing body according to the invention are not limited. In FIG. 1, the center section 10 is arranged so that the longitudinal direction of the center section 10 is along the front-rear direction, and further, the width direction of the center section 10 is along the left-right direction. In the present embodiment, the cab proximity guard 20 is disposed on the rear side of the cab 25 in FIG. 1, but the cab proximity guard 20 may be disposed on the front side of the cab 25. Although the cab proximity guard 20 is disposed on the right side of the center section 10, the cab proximity guard 20 may be disposed on the left side of the center section 10.
　このセンターセクション１０には、ブームＢが取り付けられる。ブームＢは、ワイヤロープを介して吊荷を吊るための部材であり、上部旋回体１Ａに対して起伏可能である。ブームＢの基端部は、センターセクション１０の前側端部に取り付けられる。ブームＢは、例えばラチス構造を有するラチスブームである。センターセクション１０には、ガントリおよびウインチ（それぞれ図示なし）が取り付けられる。センターセクション１０は、底板１１と、複数の側板１３と、連結部材１５（図８参照）と、を備える。 Boom B is attached to the center section 10. The boom B is a member for hanging a suspended load via a wire rope, and can be raised and lowered with respect to the upper swing body 1A. The base end portion of the boom B is attached to the front end portion of the center section 10. The boom B is a lattice boom having a lattice structure, for example. A gantry and a winch (each not shown) are attached to the center section 10. The center section 10 includes a bottom plate 11, a plurality of side plates 13, and a connecting member 15 (see FIG. 8).
　底板１１は、センターセクション１０の底部（下側部分）を構成する板であり、前後方向および左右方向に沿って延びている。 The bottom plate 11 is a plate constituting the bottom portion (lower portion) of the center section 10 and extends along the front-rear direction and the left-right direction.
　複数の側板１３は、それぞれ底板１１から上方に突出する板であり、前後方向および上下方向に沿って延びている。本実施形態では、複数の側板１３は、２枚の側板１３を含む。なお、他の実施形態において、複数の側板１３は、３枚以上の側板を備えてもよい。２枚の側板１３は、左右方向において互いに対向するように配置されている。２枚の側板１３は、右側側板１３ａ（キャブ側側板）と、左側側板１３ｂ（反キャブ側側板）と、を含む。右側側板１３ａは、２枚の側板１３のうち、最もキャブ近接ガード２０側（図１の右側）に配置される。左側側板１３ｂは、２枚の側板１３のうち、最も反キャブ側ガード３０側（図１の左側）に配置される。２枚の側板１３の間には、後記のセンターセクション領域Ａの内部領域Ａ１（内部空間）が形成されている。 The plurality of side plates 13 are plates that protrude upward from the bottom plate 11, respectively, and extend in the front-rear direction and the up-down direction. In the present embodiment, the plurality of side plates 13 include two side plates 13. In other embodiments, the plurality of side plates 13 may include three or more side plates. The two side plates 13 are arranged to face each other in the left-right direction. The two side plates 13 include a right side plate 13a (cab side plate) and a left side plate 13b (anti-cab side plate). Of the two side plates 13, the right side plate 13a is disposed closest to the cab proximity guard 20 side (right side in FIG. 1). Of the two side plates 13, the left side plate 13b is disposed closest to the anti-cab side guard 30 side (left side in FIG. 1). Between the two side plates 13, an inner region A1 (inner space) of a center section region A described later is formed.
　連結部材１５（図８参照）は、２枚の側板１３同士を連結する部材であり、左右方向に沿って延びている。連結部材１５は、例えば板形状を備え、上下方向に沿って延びている。 The connecting member 15 (see FIG. 8) is a member that connects the two side plates 13 to each other, and extends in the left-right direction. The connecting member 15 has a plate shape, for example, and extends along the vertical direction.
　キャブ近接ガード２０（エンジンガード）は、内部に騒音源を１つ以上収容する。騒音源は、例えば、エンジン２１、ファン２２、油圧ポンプ（図示なし）、油圧モータ（図示なし）、および油圧バルブ（図示なし）などを含む。エンジン２１は、建設機械の駆動源である。ファン２２は、冷却風を発生させ、例えばラジエータ（図示なし）を冷却する。キャブ近接ガード２０は、センターセクション１０よりも右側（左右方向の外側）に配置され、センターセクション１０と左右方向において対向する位置に配置される。キャブ近接ガード２０と右側側板１３ａとの間には、組み立てを容易とするために、左右方向において所定の隙間があけられている。キャブ近接ガード２０には、吸気口（図示なし）が形成される。吸気口は、例えば、キャブ近接ガード２０の後側部分（例えば後側の端部）などに設けられる。 The cab proximity guard 20 (engine guard) accommodates one or more noise sources inside. Noise sources include, for example, the engine 21, the fan 22, a hydraulic pump (not shown), a hydraulic motor (not shown), a hydraulic valve (not shown), and the like. The engine 21 is a drive source for the construction machine. The fan 22 generates cooling air and cools, for example, a radiator (not shown). The cab proximity guard 20 is disposed on the right side (outside in the left-right direction) of the center section 10 and is disposed at a position facing the center section 10 in the left-right direction. A predetermined gap is provided in the left-right direction between the cab proximity guard 20 and the right side plate 13a for easy assembly. The cab proximity guard 20 is formed with an air inlet (not shown). The intake port is provided, for example, in a rear portion (for example, a rear end portion) of the cab proximity guard 20.
　キャブ２５（運転室）は、キャブ近接ガード２０の前側に配置されている。なお、キャブ２５は、キャブ近接ガード２０の後側に配置されてもよい。キャブ２５は、キャブ近接ガード２０と前後方向において対向するように配置されている。なお、キャブ２５とキャブ近接ガード２０との間には、不図示のオイルタンクなどの部材が挟まれてもよい。また、キャブ２５は、センターセクション１０よりも右側に配置されている。なお、キャブ２５は、センターセクション１０よりも左側に配置されてもよい。 The cab 25 (cab) is arranged on the front side of the cab proximity guard 20. The cab 25 may be disposed on the rear side of the cab proximity guard 20. The cab 25 is disposed so as to face the cab proximity guard 20 in the front-rear direction. A member such as an oil tank (not shown) may be sandwiched between the cab 25 and the cab proximity guard 20. The cab 25 is disposed on the right side of the center section 10. The cab 25 may be arranged on the left side of the center section 10.
　反キャブ側ガード３０には、機器（図示なし）が収容される。反キャブ側ガード３０は、センターセクション１０と左右方向において対向し、センターセクション１０よりも左側に配置されている。さらに詳しくは、反キャブ側ガード３０は、センターセクション１０に対して、キャブ近接ガード２０およびキャブ２５が配置される側（右側）とは反対側（左側、いわば反キャブ側）に配置されている。反キャブ側ガード３０に収容される機器は、例えば油圧機器である。この油圧機器は、例えばセンターセクション１０に取り付けられたウインチ（図示なし）を駆動するための油圧モータなどを含む。この油圧機器は、エンジン、ファン、油圧ポンプなどを含んでもよい。 The anti-cab side guard 30 accommodates equipment (not shown). The anti-cab side guard 30 faces the center section 10 in the left-right direction, and is disposed on the left side of the center section 10. More specifically, the anti-cab side guard 30 is arranged on the opposite side (left side, so-called anti-cab side) to the center section 10 from the side (right side) where the cab proximity guard 20 and the cab 25 are arranged. . The device accommodated in the anti-cab side guard 30 is, for example, a hydraulic device. The hydraulic equipment includes, for example, a hydraulic motor for driving a winch (not shown) attached to the center section 10. The hydraulic device may include an engine, a fan, a hydraulic pump, and the like.
　ダクト構造４０は、前記騒音源が発生する音をキャブ近接ガード２０の内部からセンターセクション１０のセンターセクション領域Ａに伝播させる。ダクト構造４０は、キャブ近接ガード２０の内部からキャブ２５に伝わる騒音を低減するための構造である。ダクト構造４０は、キャブ近接ガード２０の内部の音（音波）を、キャブ２５から離れた位置で放射させる。ダクト構造４０の内部は、空気が流れることが可能であり、音が伝わることが可能である。なお、図１では、ダクト構造４０の部分については、切断部の端面を示す（他の図も同様（図８、図１２、図１６、および図２０を除く））。 The duct structure 40 propagates the sound generated by the noise source from the inside of the cab proximity guard 20 to the center section region A of the center section 10. The duct structure 40 is a structure for reducing noise transmitted from the inside of the cab proximity guard 20 to the cab 25. The duct structure 40 radiates the sound (sound wave) inside the cab proximity guard 20 at a position away from the cab 25. Inside the duct structure 40, air can flow and sound can be transmitted. In FIG. 1, the end surface of the cut portion is shown for the portion of the duct structure 40 (the same applies to other drawings (except for FIGS. 8, 12, 16, and 20)).
　本実施形態では、ダクト構造４０は、排気ダクトの機能も備えている。ダクト構造４０の内部には、ファン２２が発生させた冷却風が流れる。ダクト構造４０は、キャブ近接ガード２０の内部の空気（排気）を、キャブ近接ガード２０から離れた位置で放出させる。 In the present embodiment, the duct structure 40 also has an exhaust duct function. Cooling air generated by the fan 22 flows inside the duct structure 40. The duct structure 40 discharges air (exhaust) inside the cab proximity guard 20 at a position away from the cab proximity guard 20.
　このダクト構造４０の内部を伝わる音の伝搬方向における上流側と、ダクト構造４０の内部を伝わる冷却風の上流側と、は同じ側である（下流側も同様）。以下では、ダクト構造４０の内部を伝わる音の伝搬方向における上流および下流を、単に「上流」および「下流」とする。ダクト構造４０の最も上流側の位置が「ダクト構造４０の入口」、ダクト構造４０の最も下流側の位置が「ダクト構造４０の出口」と定義される。ダクト構造４０の内部の流れの向きが、「流れ方向」と定義される。 The upstream side in the propagation direction of the sound transmitted through the duct structure 40 and the upstream side of the cooling air transmitted through the duct structure 40 are the same side (the same applies to the downstream side). Hereinafter, the upstream and downstream in the propagation direction of the sound transmitted through the duct structure 40 are simply referred to as “upstream” and “downstream”. The position on the most upstream side of the duct structure 40 is defined as “the inlet of the duct structure 40”, and the position on the most downstream side of the duct structure 40 is defined as “the outlet of the duct structure 40”. The direction of flow inside the duct structure 40 is defined as “flow direction”.
　このダクト構造４０は、キャブ近接ガード２０の内部空間と、右側側板１３ａよりも左側の空間の内部と、を略連通する。具体的には、ダクト構造４０は、キャブ近接ガード２０の内部空間と、センターセクション領域Ａ（図４参照）内の空間と、を略連通する。ここで、「略連通」には、閉空間により空間どうしが通じることだけでなく、後述の「ダクト様構造」のように略閉空間により空間どうしが通じることも含まれる（以下の「略連通」も同様）。ダクト構造４０の内部の流路の途中に、漏れ部（小開口など、音が漏れる部分）があってもよい。ダクト構造４０には、板状の側壁がなく、ゴム板やゴムシートなどで構成された部分などがあってもよい。ダクト構造４０の一部または全部は、ホース状やパイプ状でもよい。本実施形態では、ダクト構造４０は、開口およびダクト（筒状部材）により構成される。ダクト構造４０は、上流側から下流側の順に、キャブ近接ガード開口５１（第１放出開口部）と、右側接続ダクト５５（ガイド部、収容ガード側接続ガイド）と、右側側板開口５９（第１受入開口部）と、センターダクト６０（ガイド部、センターセクション内部ガイド）と、を備える。 The duct structure 40 substantially communicates the internal space of the cab proximity guard 20 with the inside of the space on the left side of the right side plate 13a. Specifically, the duct structure 40 substantially communicates the internal space of the cab proximity guard 20 and the space in the center section region A (see FIG. 4). Here, “substantially communicating” includes not only that the spaces communicate with each other due to the closed space, but also that the spaces communicate with each other through the substantially closed space as described later in “duct-like structure” (hereinafter referred to as “substantially communicating”). "Is the same). There may be a leaking portion (a portion where sound leaks, such as a small opening) in the middle of the flow path inside the duct structure 40. The duct structure 40 does not have a plate-like side wall, and may have a portion made of a rubber plate or a rubber sheet. Part or all of the duct structure 40 may have a hose shape or a pipe shape. In the present embodiment, the duct structure 40 includes an opening and a duct (tubular member). The duct structure 40 includes, in order from the upstream side to the downstream side, a cab proximity guard opening 51 (first discharge opening), a right connection duct 55 (guide portion, accommodation guard side connection guide), and a right side plate opening 59 (first Receiving opening) and a center duct 60 (guide portion, center section internal guide).
　キャブ近接ガード開口５１は、キャブ近接ガード２０に形成される開口であり、キャブ近接ガード２０の左側の側壁を左右方向に沿って貫通する貫通孔である。キャブ近接ガード開口５１は、右側側板１３ａと左右方向に対向する位置に配置されている。キャブ近接ガード開口５１は、ダクト構造４０の入口である。キャブ近接ガード開口５１は、当該キャブ近接ガード開口５１を通じてキャブ近接ガード２０の内部から音が放出されることを許容する。図１に示す例では、キャブ近接ガード開口５１は、ファン２２よりも前側に配置され、更にエンジン２１よりも前側に配置される。なお、図１では、キャブ近接ガード開口５１と、キャブ近接ガード２０の内部の空間と、の境界を二点鎖線で示した（他の境界も同様）。 The cab proximity guard opening 51 is an opening formed in the cab proximity guard 20 and is a through-hole penetrating the left side wall of the cab proximity guard 20 along the left-right direction. The cab proximity guard opening 51 is disposed at a position facing the right side plate 13a in the left-right direction. The cab proximity guard opening 51 is an inlet of the duct structure 40. The cab proximity guard opening 51 allows sound to be emitted from the inside of the cab proximity guard 20 through the cab proximity guard opening 51. In the example shown in FIG. 1, the cab proximity guard opening 51 is disposed in front of the fan 22 and further disposed in front of the engine 21. In FIG. 1, the boundary between the cab proximity guard opening 51 and the space inside the cab proximity guard 20 is indicated by a two-dot chain line (the same applies to the other boundaries).
　右側接続ダクト５５（ガイド部、収容ガード側接続ガイド）は、キャブ近接ガード開口５１と連通するダクトである。右側接続ダクト５５は、キャブ近接ガード２０と右側側板１３ａとの間に配置されている。右側接続ダクト５５での流れ方向は、左方向である。換言すれば、右側接続ダクト５５は、キャブ近接ガード開口５１と右側側板開口５９とを接続するように配設され、エンジン２１が発した音がキャブ近接ガード開口５１から右側側板開口５９に向かって進行するように前記音をガイドする。 The right connection duct 55 (guide part, accommodation guard side connection guide) is a duct communicating with the cab proximity guard opening 51. The right connection duct 55 is disposed between the cab proximity guard 20 and the right side plate 13a. The flow direction in the right connection duct 55 is the left direction. In other words, the right connection duct 55 is disposed so as to connect the cab proximity guard opening 51 and the right side plate opening 59, and sound generated by the engine 21 is directed from the cab proximity guard opening 51 toward the right side plate opening 59. Guide the sound as it progresses.
　右側側板開口５９（第１受入開口部）は、右側側板１３ａに形成される開口であり、右側側板１３ａを左右方向に沿って貫通する貫通孔である。右側側板開口５９は、キャブ近接ガード開口５１と左右方向において互いに対向する位置に配置されている。右側側板開口５９は、右側接続ダクト５５と連通する。また、右側側板開口５９は、右側接続ダクト５５を介してキャブ近接ガード開口５１と連通する。右側側板開口５９は、キャブ近接ガード開口５１を通じて放出された音が右側側板開口５９を通じてセンターセクション０のセンターセクション領域Ａ（内部空間）に受け入れられることを許容する。右側側板開口５９は、次のように配置されることが好ましい。センターセクション１０に右側側板開口５９が形成されない場合に比べ、右側側板開口５９が形成されたセンターセクション１０の剛性ができるだけ低下しないように、右側側板開口５９の位置が設定される。具体的には例えば、右側側板開口５９の位置は、センターセクション１０のうち、ひずみエネルギー分布においてひずみエネルギーが小さく、大きな応力がかからないと判断される位置に設定される。この判断は、例えば、構造解析によって、ひずみエネルギー分布と主応力ベクトル線図とが求められ、そこから想定された力線に基づいて行われる。 The right side plate opening 59 (first receiving opening) is an opening formed in the right side plate 13a, and is a through-hole penetrating the right side plate 13a along the left-right direction. The right side plate opening 59 is disposed at a position facing the cab proximity guard opening 51 in the left-right direction. The right side plate opening 59 communicates with the right connection duct 55. Further, the right side plate opening 59 communicates with the cab proximity guard opening 51 through the right connection duct 55. The right side plate opening 59 allows sound emitted through the cab proximity guard opening 51 to be received by the center section region A (internal space) of the center section 0 through the right side plate opening 59. The right side plate opening 59 is preferably arranged as follows. Compared to the case where the right side plate opening 59 is not formed in the center section 10, the position of the right side plate opening 59 is set so that the rigidity of the center section 10 in which the right side plate opening 59 is formed is not reduced as much as possible. Specifically, for example, the position of the right side plate opening 59 is set to a position in the center section 10 where it is determined that the strain energy is small and no large stress is applied in the strain energy distribution. This determination is made based on the force line assumed from the strain energy distribution and the principal stress vector diagram obtained by, for example, structural analysis.
　センターダクト６０（の少なくとも一部）は、上下方向に沿って見たときにセンターセクション１０と重なるように配置されるダクトである。さらに詳しくは、図２に示すように、センターダクト６０は、２枚の側板１３により画定されるセンターセクション領域Ａ内に配置される。センターセクション領域Ａは、右側側板１３ａの右側端部よりも左側であり、かつ、左側側板１３ｂの左側端部よりも右側の領域である。さらに、センターセクション領域Ａは、側板１３の前側端部よりも後側であり、かつ、側板１３の後側端部よりも前側の領域である。図３に示すように、センターセクション領域Ａは、上下方向に沿って分類された、内部領域Ａ１と、上方領域Ａ２と、下方領域Ａ３と、を含む。内部領域Ａ１は、右側側板１３ａの右側端部と左側側板１３ｂの左側端部とに挟まれた領域である。上方領域Ａ２は、センターセクション１０の上方（右側側板１３ａおよび左側側板１３ｂの上側端部よりも上側）の領域であり、例えばセンターセクション１０に取り付けられたウインチ（図示なし）よりも上側の領域を含む。下方領域Ａ３は、センターセクション１０の下方の領域であり、底板１１よりも下側の領域を含む。センターダクト６０は、内部領域Ａ１、上方領域Ａ２、および下方領域Ａ３の少なくともいずれかに配置される。センターダクト６０は、図３に示す例では内部領域Ａ１の下側部分に配置されている。なお、センターダクト６０は、内部領域Ａ１の上側部分に配置されてもよい。図１に示すように、センターダクト６０は、右側側板開口５９と連通する。センターダクト６０は、右側側板開口５９および右側接続ダクト５５を介して、キャブ近接ガード開口５１と連通する。センターダクト６０の下流側の端は、ダクト構造４０の出口である。センターダクト６０は、直線部６１ａを備える。直線部６１ａは、流れ方向が直線状（略直線状を含む）となる部分である（下記の他の直線部も同様）。直線部６１ａは、右側側板開口５９から左側に延び、左側側板１３ｂよりも右側の位置まで延びている。センターダクト６０は、直線部６１ａ以外の部分を備えてもよい。センターダクト６０は、右側側板開口５９からセンターセクション１０の内部空間に延びるように配置され、前記内部空間への音の進行をガイドする。 The center duct 60 (at least a part thereof) is a duct arranged so as to overlap the center section 10 when viewed along the vertical direction. More specifically, as shown in FIG. 2, the center duct 60 is disposed in a center section region A defined by the two side plates 13. The center section region A is a region on the left side of the right end portion of the right side plate 13a and on the right side of the left end portion of the left side plate 13b. Further, the center section region A is a region on the rear side of the front side end portion of the side plate 13 and on the front side of the rear side end portion of the side plate 13. As shown in FIG. 3, the center section area A includes an inner area A1, an upper area A2, and a lower area A3, which are classified along the vertical direction. The internal region A1 is a region sandwiched between the right end of the right side plate 13a and the left end of the left side plate 13b. The upper region A2 is a region above the center section 10 (above the upper end portions of the right side plate 13a and the left side plate 13b). For example, the upper region A2 is a region above a winch (not shown) attached to the center section 10. Including. The lower area A3 is an area below the center section 10 and includes an area below the bottom plate 11. The center duct 60 is disposed in at least one of the inner region A1, the upper region A2, and the lower region A3. In the example shown in FIG. 3, the center duct 60 is disposed in the lower portion of the internal region A1. In addition, the center duct 60 may be arrange | positioned in the upper part of internal area | region A1. As shown in FIG. 1, the center duct 60 communicates with the right side plate opening 59. The center duct 60 communicates with the cab proximity guard opening 51 via the right side plate opening 59 and the right side connection duct 55. The downstream end of the center duct 60 is an outlet of the duct structure 40. The center duct 60 includes a straight portion 61a. The straight portion 61a is a portion where the flow direction is a straight line (including a substantially straight line) (the same applies to the other straight lines described below). The straight portion 61a extends to the left side from the right side plate opening 59 and extends to a position on the right side of the left side plate 13b. The center duct 60 may include a portion other than the straight portion 61a. The center duct 60 is disposed so as to extend from the right side plate opening 59 to the internal space of the center section 10 and guides the progress of sound into the internal space.
　このセンターダクト６０は、例えば複数の板が接合されることで筒状にされたものなどであり、ホースでもよい。センターダクト６０の一部が、センターセクション１０を構成する部材と兼用（共通化）されてもよい。部材の兼用により、センターダクト６０を簡易な構成とすることが可能である。具体的には、センターダクト６０の底面（下側の面）は、底板１１と兼用可能とされる（底板１１により構成される）。なお、センターダクト６０を構成する部材のうち、センターセクション１０と兼用されない部分（板）の板厚が厚く設定されることで、センターセクション１０の剛性を高めることができる。 The center duct 60 is, for example, a cylinder formed by joining a plurality of plates, and may be a hose. A part of the center duct 60 may also be used (shared) as a member constituting the center section 10. The center duct 60 can be configured simply by using the members also. Specifically, the bottom surface (lower surface) of the center duct 60 can also be used as the bottom plate 11 (configured by the bottom plate 11). In addition, the rigidity of the center section 10 can be increased by setting the plate thickness of a portion (plate) that does not serve as the center section 10 among members constituting the center duct 60 to be thick.
　（音の経路について）
　キャブ近接ガード２０の内部の音は、上流側から下流側の順に、次のように伝わる。キャブ近接ガード２０の内部の音は、キャブ近接ガード開口５１の内部（ダクト構造４０の入口）、右側接続ダクト５５の内部、および、右側側板開口５９の内部を介して、センターダクト６０の内部に伝わる。この音は、センターダクト６０の最も下流側の位置（ダクト構造４０の出口）から、センターセクション領域Ａの内部領域Ａ１（いわば、キャブ２５から離れた位置）に放射される。なお、センターダクト６０の内部の音は、上方領域Ａ２や下方領域Ａ３に放射されてもよい。また、ファン２２が発生させた冷却風の排気の経路は、上記の音の経路と同様である。この際、右側接続ダクト５５およびセンターダクト６０は、キャブ近接ガード開口５１および右側側板開口５９を通じて、音がキャブ近接ガード２０からセンターセクション１０の内部空間に進行するように音をガイドする。 (Sound path)
The sound inside the cab proximity guard 20 is transmitted as follows from the upstream side to the downstream side. Sound inside the cab proximity guard 20 enters the inside of the center duct 60 through the inside of the cab proximity guard opening 51 (inlet of the duct structure 40), the right side connection duct 55, and the right side plate opening 59. It is transmitted. This sound is radiated from the most downstream position of the center duct 60 (exit of the duct structure 40) to the inner area A1 of the center section area A (in other words, a position away from the cab 25). The sound inside the center duct 60 may be radiated to the upper area A2 and the lower area A3. The cooling air exhaust path generated by the fan 22 is the same as the sound path described above. At this time, the right connection duct 55 and the center duct 60 guide the sound through the cab proximity guard opening 51 and the right side plate opening 59 so that the sound travels from the cab proximity guard 20 to the internal space of the center section 10.
　（音の減衰について）
　ダクト構造４０の内部を通る音は、距離減衰により減音される。ダクト構造４０の出口（センターダクト６０の出口）からセンターセクション領域Ａに放射された音は、回折減衰により減音される。その結果、ダクト構造４０がない場合に比べ、キャブ２５に伝わる音が低減され、キャブ２５内の騒音が低減される。例えば、キャブ２５内を静かで快適にすることができる。 (About sound attenuation)
Sound passing through the inside of the duct structure 40 is reduced by distance attenuation. Sound radiated from the outlet of the duct structure 40 (exit of the center duct 60) to the center section region A is attenuated by diffraction attenuation. As a result, compared with the case where there is no duct structure 40, the sound transmitted to the cab 25 is reduced, and the noise in the cab 25 is reduced. For example, the interior of the cab 25 can be made quiet and comfortable.
　（吸音材について）
　ダクト構造４０の内面の一部または全部に、吸音材が設けられてもよい。この場合、ダクト構造４０の内部を通る音が、吸音材により吸音される。その結果、キャブ２５に伝わる音が、より低減される。なお、センターダクト６０の内部に雨などが入り得る場合は、センターダクト６０の内部には、吸音材が設けられないことが望ましい。また、吸音材が設けられる場合には、雨の進入を防ぐために、センターダクト６０の上方を覆う部材が配置されてもよい。 (About sound absorbing material)
A sound absorbing material may be provided on part or all of the inner surface of the duct structure 40. In this case, the sound passing through the inside of the duct structure 40 is absorbed by the sound absorbing material. As a result, the sound transmitted to the cab 25 is further reduced. If rain or the like can enter the center duct 60, it is desirable that no sound absorbing material be provided inside the center duct 60. When a sound absorbing material is provided, a member that covers the upper portion of the center duct 60 may be disposed in order to prevent rain from entering.
　図１に示す上部旋回体１Ａは次のような効果を備えている。上部旋回体１Ａは、センターセクション１０と、キャブ近接ガード２０と、キャブ２５と、ダクト構造４０と、を備える。センターセクション１０は、左右方向に沿って互いに対向する複数の側板１３を有する。キャブ近接ガード２０は、センターセクション１０よりも右側または左側に配置され、エンジン２１を収容する。キャブ２５は、キャブ近接ガード２０よりも前側または後側に配置される。ダクト構造４０は、キャブ近接ガード開口５１と、センターダクト６０と、を備える。 The upper swing body 1A shown in FIG. 1 has the following effects. The upper swing body 1 </ b> A includes a center section 10, a cab proximity guard 20, a cab 25, and a duct structure 40. The center section 10 has a plurality of side plates 13 facing each other along the left-right direction. The cab proximity guard 20 is disposed on the right side or the left side of the center section 10 and accommodates the engine 21. The cab 25 is disposed in front of or behind the cab proximity guard 20. The duct structure 40 includes a cab proximity guard opening 51 and a center duct 60.
　そして、本実施形態では、キャブ近接ガード開口５１は、キャブ近接ガード２０に形成される開口である。また、センターダクト６０は、キャブ近接ガード開口５１と略連通する。このため、キャブ近接ガード２０の内部の音は、センターダクト６０の内部に伝わる。また、本実施形態では、センターダクト６０は、上下方向に沿って見たときにセンターセクション１０と重なるように配置されている。このため、センターダクト６０の内部の音は、センターセクション領域Ａ内に伝わる。よって、本実施形態に係るダクト構造４０を備えない場合に比べ、キャブ近接ガード２０の内部の音が、キャブ２５に伝わりにくい。よって、キャブ２５内の騒音を抑制できる。 In the present embodiment, the cab proximity guard opening 51 is an opening formed in the cab proximity guard 20. Further, the center duct 60 communicates with the cab proximity guard opening 51 substantially. For this reason, the sound inside the cab proximity guard 20 is transmitted to the inside of the center duct 60. Moreover, in this embodiment, the center duct 60 is arrange | positioned so that it may overlap with the center section 10 when it sees along an up-down direction. For this reason, the sound inside the center duct 60 is transmitted into the center section region A. Therefore, compared with the case where the duct structure 40 according to the present embodiment is not provided, the sound inside the cab proximity guard 20 is not easily transmitted to the cab 25. Therefore, the noise in the cab 25 can be suppressed.
　図２４に従来の上部旋回体６０１が示されている。上部旋回体６０１では、開口部６５１が、キャブ近接ガード２０に形成されている。この開口部６５１は、例えば、ファン２２の排気を放出させるための排気口、または吸気口などである。この開口部６５１からは、キャブ近接ガード２０の内部の騒音源（エンジン２１やファン２２）が発した音が放射される。開口部６５１から放射された音は、例えば、キャブ２５に直接伝搬する。また例えば、キャブ近接ガード２０の左側の面に開口部６５１が設けられた場合などには、音の多重反射が次のように生じる場合もある。開口部６５１から放射された音は、左右方向において互いに対向する右側側板１３ａとキャブ近接ガード２０との間で多重反射する。また、開口部６５１から放射された音は、右側側板１３ａとキャブ２５との間で多重反射する。その結果、キャブ２５内に音が伝わり、例えばキャブ２５内の快適性を低下させる。一方、図１に示すように、本実施形態の上部旋回体１Ａでは、キャブ近接ガード２０の内部の音は、ダクト構造４０を介してセンターセクション領域Ａ内に伝わるので、キャブ２５に伝わりにくい。よって、キャブ２５内の騒音を抑制できる。 FIG. 24 shows a conventional upper swing body 601. In the upper swing body 601, an opening 651 is formed in the cab proximity guard 20. The opening 651 is, for example, an exhaust port for discharging the exhaust of the fan 22 or an intake port. From this opening 651, the sound emitted by the noise source (engine 21 and fan 22) inside the cab proximity guard 20 is radiated. The sound radiated from the opening 651 propagates directly to the cab 25, for example. For example, when the opening 651 is provided on the left surface of the cab proximity guard 20, multiple reflection of sound may occur as follows. The sound radiated from the opening 651 is subjected to multiple reflections between the right side plate 13a and the cab proximity guard 20 facing each other in the left-right direction. Further, the sound radiated from the opening 651 is subjected to multiple reflections between the right side plate 13 a and the cab 25. As a result, sound is transmitted into the cab 25, and, for example, comfort in the cab 25 is reduced. On the other hand, as shown in FIG. 1, in the upper swing body 1 </ b> A of the present embodiment, the sound inside the cab proximity guard 20 is transmitted to the center section region A through the duct structure 40, and thus is difficult to be transmitted to the cab 25. Therefore, the noise in the cab 25 can be suppressed.
　また、本実施形態では、ダクト構造４０は、キャブ近接ガード開口５１とセンターダクト６０とを連通させる右側接続ダクト５５を備えている。このため、キャブ近接ガード開口５１とセンターダクト６０との間で、ダクト構造４０の内部から外部へ、音が漏れにくい。よって、キャブ２５内の騒音をより抑制できる。 In the present embodiment, the duct structure 40 includes a right connection duct 55 that allows the cab proximity guard opening 51 and the center duct 60 to communicate with each other. For this reason, it is difficult for sound to leak from the inside of the duct structure 40 to the outside between the cab proximity guard opening 51 and the center duct 60. Therefore, the noise in the cab 25 can be further suppressed.
　更に、本実施形態では、キャブ近接ガード開口５１は、エンジン２１よりもキャブ２５側（前側）（エンジン２１とキャブ２５との間）に配置されている。図２４に示すように、ダクト構造４０が設けられない場合、開口部６５１の位置がキャブ２５に近いほど（前側ほど）、キャブ近接ガード開口５１からキャブ２５に音が伝わりやすい。一方、図１に示すように、本実施形態の上部旋回体１Ａは、ダクト構造４０を備えている。よって、キャブ近接ガード開口５１がキャブ２５に近い位置にある場合、具体的にはキャブ近接ガード開口５１がエンジン２１よりも前側にある場合でも、キャブ２５内の騒音を確実に抑制できる。 Furthermore, in the present embodiment, the cab proximity guard opening 51 is disposed on the cab 25 side (front side) (between the engine 21 and the cab 25) with respect to the engine 21. As shown in FIG. 24, when the duct structure 40 is not provided, sound is more easily transmitted from the cab proximity guard opening 51 to the cab 25 as the position of the opening 651 is closer to the cab 25 (front side). On the other hand, as shown in FIG. 1, the upper swing body 1 </ b> A of the present embodiment includes a duct structure 40. Therefore, when the cab proximity guard opening 51 is at a position close to the cab 25, specifically, even when the cab proximity guard opening 51 is on the front side of the engine 21, noise in the cab 25 can be reliably suppressed.
　（第１変形実施形態）
　図４を参照して、本発明の第１変形実施形態に係る上部旋回体１Ｂについて、先の第１実施形態（図１参照）との相違点を説明する。なお、本変形実施形態のうち、第１実施形態との共通点については、第１実施形態と同一の符号を付し、説明を省略した（共通点の説明を省略する点については他の形態の説明も同様）。上記の相違点は、次の通りである。ダクト構造４０は、右側外部開口４３（キャブ近接ガード側外部開口）と、右側ダクト４５（ガイド部、収容ガード内部ガイド）と、を備える。センターダクト６０の構成は、第１実施形態とは異なる。ダクト構造４０は、更に、右側接続ダクト様構造１５５－２（収容ガード側接続ダクト様構造）を備える。 (First modified embodiment)
With reference to FIG. 4, a difference between the upper swing body 1B according to the first modified embodiment of the present invention and the first embodiment (see FIG. 1) will be described. Note that, in this modified embodiment, the same points as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted (other points are omitted in the description of the common points). The explanation of is also the same). The above differences are as follows. The duct structure 40 includes a right outer opening 43 (cab proximity guard side outer opening) and a right duct 45 (guide portion, housing guard inner guide). The configuration of the center duct 60 is different from that of the first embodiment. The duct structure 40 further includes a right connection duct-like structure 155-2 (accommodating guard side connection duct-like structure).
　右側外部開口４３は、キャブ近接ガード２０に形成される開口であり、キャブ近接ガード開口５１とは別に設けられ、キャブ近接ガード開口５１とは異なる位置に配置される。右側外部開口４３は、キャブ近接ガード２０の内部と外部とを連通させる。右側外部開口４３は、右側ダクト４５と、キャブ近接ガード２０の外部とを連通させる。右側外部開口４３は、キャブ近接ガード２０のうち、キャブ２５から遠い位置に設けられることが好ましく、例えば後側部分に配置され、後側の側面に配置される。右側外部開口４３は、キャブ近接ガード２０の右側の側面または左側の側面に配置されてもよい。 The right external opening 43 is an opening formed in the cab proximity guard 20, is provided separately from the cab proximity guard opening 51, and is disposed at a position different from the cab proximity guard opening 51. The right external opening 43 allows the inside and outside of the cab proximity guard 20 to communicate with each other. The right external opening 43 allows the right duct 45 to communicate with the outside of the cab proximity guard 20. The right external opening 43 is preferably provided at a position far from the cab 25 in the cab proximity guard 20, and is disposed, for example, at the rear portion and at the rear side surface. The right outer opening 43 may be disposed on the right side surface or the left side surface of the cab proximity guard 20.
　右側ダクト４５は、キャブ近接ガード開口５１からキャブ近接ガード２０の内部に延びるように配置されるダクトである。図１に示す第１実施形態では、ダクト構造４０の入口は、キャブ近接ガード開口５１であったが、図４に示す本変形実施形態では、ダクト構造４０の入口は、右側ダクト４５の最も上流側の位置である。右側ダクト４５は、キャブ近接ガード開口５１と連通する。右側ダクト４５での流れ方向は、左方向であり、直線状である。なお、右側ダクト４５での流れ方向は、曲がってもよい（下記の屈曲部１６２ａなどと同様）。右側ダクト４５は、エンジン２１が発した音がキャブ近接ガード開口５１から右側側板開口５９に向かって進行するように前記音をガイドする。 The right duct 45 is a duct arranged so as to extend from the cab proximity guard opening 51 into the cab proximity guard 20. In the first embodiment shown in FIG. 1, the inlet of the duct structure 40 is the cab proximity guard opening 51, but in this modified embodiment shown in FIG. 4, the inlet of the duct structure 40 is the most upstream of the right duct 45. Side position. The right duct 45 communicates with the cab proximity guard opening 51. The flow direction in the right duct 45 is the left direction and is linear. The flow direction in the right duct 45 may be bent (similar to the bent portion 162a described below). The right duct 45 guides the sound so that the sound generated by the engine 21 travels from the cab proximity guard opening 51 toward the right side plate opening 59.
　センターダクト６０は、図１に示す第１実施形態の直線部６１ａに代えて、図４に示すように、屈曲部１６２ａと、直線部１６２ｂと、を備える。屈曲部１６２ａは、流れ方向が曲がる（変わる）部分である（下記の他の屈曲部も同様）。屈曲部１６２ａのように、流れ方向が曲がる部分では、減音効果が得られる。流れ方向が曲がる部分が多いほど、曲がりによる減音効果を大きく得ることができる。屈曲部１６２ａは、右側側板開口５９の近傍に配置され、流れ方向を左方向から後方向に曲げる。直線部１６２ｂは、屈曲部１６２ａから後方に向かって延びる。直線部１６２ｂの最も下流側の位置は、ダクト構造４０の出口である。直線部１６２ｂの右側の側面は、右側側板１３ａによって画定されている。 The center duct 60 includes a bent portion 162a and a straight portion 162b, as shown in FIG. 4, instead of the straight portion 61a of the first embodiment shown in FIG. The bent portion 162a is a portion where the flow direction is bent (changes) (the same applies to the other bent portions described below). A sound reduction effect is obtained at a portion where the flow direction is bent, such as the bent portion 162a. The more the part where the flow direction bends, the greater the sound reduction effect due to the bend. The bent portion 162a is disposed in the vicinity of the right side plate opening 59 and bends the flow direction from the left to the rear. The straight portion 162b extends rearward from the bent portion 162a. The most downstream position of the straight portion 162b is the outlet of the duct structure 40. The right side surface of the straight portion 162b is defined by the right side plate 13a.
　右側接続ダクト様構造１５５－２（収容ガード側接続ダクト様構造）は、第１実施形態における右側接続ダクト５５（図１参照）の位置周辺に設けられる。右側接続ダクト様構造１５５－２は、空間的に略連通するように配置されたキャブ近接ガード開口５１（上流部）と右側側板開口５９（下流部）とにより構成される、ダクト様構造である。右側接続ダクト様構造１５５－２は、キャブ近接ガード開口５１と、センターダクト６０と、を略連通させる。ダクト様構造とは、ダクト様構造の上流部（キャブ近接ガード開口５１）から下流部（右側側板開口５９）に、音響エネルギーの少なくとも一部が伝わる程度に、上流部と下流部とが空間的に連続している構造である。上記「音響エネルギーの少なくとも一部」の「少なくとも一部」は、例えば２５％以上である。ダクト様構造では、例えば、音の伝搬方向（図１では左右方向）において、上流部（キャブ近接ガード開口５１）の少なくとも一部と、下流部（右側側板開口５９）の少なくとも一部と、が対向する。 The right connection duct-like structure 155-2 (accommodating guard-side connection duct-like structure) is provided around the position of the right connection duct 55 (see FIG. 1) in the first embodiment. The right connection duct-like structure 155-2 is a duct-like structure constituted by a cab proximity guard opening 51 (upstream part) and a right side plate opening 59 (downstream part) arranged so as to communicate substantially spatially. . The right connection duct-like structure 155-2 allows the cab proximity guard opening 51 and the center duct 60 to communicate with each other substantially. The duct-like structure means that the upstream part and the downstream part are spatially large enough to transmit at least part of the acoustic energy from the upstream part (cab proximity guard opening 51) to the downstream part (right side plate opening 59). This is a continuous structure. The “at least part” of the “at least part of acoustic energy” is, for example, 25% or more. In the duct-like structure, for example, at least a part of the upstream part (cab proximity guard opening 51) and at least a part of the downstream part (right side plate opening 59) in the sound propagation direction (left-right direction in FIG. 1). opposite.
　本変形実施形態では、ダクト構造４０は、キャブ近接ガード開口５１とセンターダクト６０とを空間的に略連通させる右側接続ダクト様構造１５５－２を備える。このため、右側接続ダクト５５（図１参照）が設けられない場合でも、右側接続ダクト様構造１５５－２の上流部（キャブ近接ガード開口５１）から下流部（右側側板開口５９を介してセンターダクト６０）へ音を伝えることができる。よって、キャブ２５の騒音を抑制できる。 In the present modified embodiment, the duct structure 40 includes a right connection duct-like structure 155-2 that allows the cab proximity guard opening 51 and the center duct 60 to substantially communicate spatially. For this reason, even if the right connection duct 55 (see FIG. 1) is not provided, the center duct through the downstream portion (the right side plate opening 59) from the upstream portion (cab proximity guard opening 51) of the right connection duct-like structure 155-2. 60). Therefore, the noise of the cab 25 can be suppressed.
　また、本変形実施形態では、ダクト構造４０は、右側ダクト４５を備える。右側ダクト４５は、キャブ近接ガード２０の内部に配置され、キャブ近接ガード開口５１と連通する。このため、キャブ近接ガード２０の内部の音は、右側ダクト４５で減音され、さらにセンターダクト６０で減音される。よって、右側ダクト４５が設けられない場合に比べ、キャブ２５内の騒音をより抑制できる。 Moreover, in this modified embodiment, the duct structure 40 includes a right duct 45. The right duct 45 is disposed inside the cab proximity guard 20 and communicates with the cab proximity guard opening 51. For this reason, the sound inside the cab proximity guard 20 is reduced by the right duct 45 and further reduced by the center duct 60. Therefore, compared with the case where the right duct 45 is not provided, noise in the cab 25 can be further suppressed.
　（第２変形実施形態）
　図５を参照して、本発明の第２変形実施形態に係る上部旋回体１Ｃについて、先の第１変形実施形態（図４参照）との相違点を説明する。相違点は、センターダクト６０の構成である。センターダクト６０は、第１変形実施形態と同様の、屈曲部１６２ａと、直線部１６２ｂと、を備える。さらに、センターダクト６０は、屈曲部１６３ａと、直線部１６３ｂと、を備える。屈曲部１６３ａは、直線部１６２ｂの後側端部の近傍に配置され、流れ方向を後方向から左方向に曲げる。屈曲部１６３ａの右側の側面は、右側側板１３ａによって画定される。直線部１６３ｂは、屈曲部１６３ａから左方に延びている。直線部１６３ｂの最も下流側の位置は、ダクト構造４０の出口であり、左側側板１３ｂよりも右側に配置される。 (Second modified embodiment)
With reference to FIG. 5, a difference between the upper rotating body 1C according to the second modified embodiment of the present invention and the first modified embodiment (see FIG. 4) will be described. The difference is the configuration of the center duct 60. The center duct 60 includes a bent portion 162a and a straight portion 162b, which are the same as those in the first modified embodiment. Furthermore, the center duct 60 includes a bent portion 163a and a straight portion 163b. The bent portion 163a is disposed in the vicinity of the rear end portion of the straight portion 162b and bends the flow direction from the rear direction to the left direction. The right side surface of the bent portion 163a is defined by the right side plate 13a. The straight portion 163b extends to the left from the bent portion 163a. The most downstream position of the straight portion 163b is the outlet of the duct structure 40, and is disposed on the right side of the left side plate 13b.
　（第３変形実施形態）
　図６～図８を参照して、本発明の第３変形実施形態に係る上部旋回体１Ｄについて、先の第１実施形態（図１参照）との相違点を説明する。相違点は、センターダクト６０の構成と、図８に示す油圧ホース１９３と、である。 (Third modified embodiment)
With reference to FIGS. 6 to 8, the difference between the upper swing body 1D according to the third modified embodiment of the present invention and the first embodiment (see FIG. 1) will be described. The difference is the configuration of the center duct 60 and the hydraulic hose 193 shown in FIG.
　センターダクト６０は、図６に示すように、第１実施形態（図１参照）と同様の直線部６１ａを備える。さらに、センターダクト６０は、屈曲部１６４ａと、拡張縮小部１６４ｂと、直線部１６４ｃと、を備える。屈曲部１６４ａは、直線部６１ａの左側端部の近傍に配置され、流れ方向を左方向から後方向に曲げる。 The center duct 60 includes a straight portion 61a similar to that of the first embodiment (see FIG. 1), as shown in FIG. Furthermore, the center duct 60 includes a bent portion 164a, an expansion / reduction portion 164b, and a straight portion 164c. The bent portion 164a is disposed in the vicinity of the left end portion of the linear portion 61a and bends the flow direction from the left to the rear.
　拡張縮小部１６４ｂは、流れ方向に沿って見たダクト構造４０の断面積が変わる部分であり、この断面積が拡張および縮小する部分である。拡張縮小部１６４ｂでは、断面積変化による音波の反射により、減音効果が得られる。拡張縮小部１６４ｂは、屈曲部１６４ａよりも後側に配置される。拡張縮小部１６４ｂの左右方向外側の側面は、側板１３によって画定されている。拡張縮小部１６４ｂの前側かつ右側の側面は、直線部６１ａと兼用される。図８に示すように、拡張縮小部１６４ｂは、連結部材１５と兼用される。拡張縮小部１６４ｂと兼用される連結部材１５は、例えば、ガントリ（図示なし）の支持部を補強するための連結部材１５（図７および図８参照）、および、その近傍（後側）の連結部材１５などである。拡張縮小部１６４ｂの上流側の端部（入口）および下流側の端部（出口）は、連結部材１５に形成された貫通孔により構成される。 The expansion / contraction portion 164b is a portion where the cross-sectional area of the duct structure 40 as viewed along the flow direction changes, and is a portion where the cross-sectional area expands and contracts. In the expansion / reduction unit 164b, a sound reduction effect is obtained by reflection of sound waves due to a change in cross-sectional area. The expansion / contraction portion 164b is disposed on the rear side of the bent portion 164a. The side surface on the outer side in the left-right direction of the expansion / reduction portion 164b is defined by the side plate 13. The front side surface and the right side surface of the expansion / reduction portion 164b are also used as the straight portion 61a. As shown in FIG. 8, the expansion / contraction portion 164 b is also used as the connection member 15. The connecting member 15 also used as the expansion / contraction part 164b is, for example, a connecting member 15 (see FIGS. 7 and 8) for reinforcing a support part of a gantry (not shown), and the vicinity (rear side) of the connecting member 15 The member 15 or the like. The upstream end portion (inlet) and the downstream end portion (exit) of the expansion / contraction portion 164 b are configured by through holes formed in the connecting member 15.
　直線部１６４ｃは、図６に示すように、拡張縮小部１６４ｂの下流側の端部から、後方に延びている。直線部１６４ｃの下流側の端部は、ダクト構造４０の出口である。なお、図８では直線部１６４ｃを省略した。また、他の実施形態において直線部１６４ｃは設けられなくてもよい。 As shown in FIG. 6, the straight portion 164c extends rearward from the downstream end of the expansion / reduction portion 164b. The downstream end of the straight portion 164 c is an outlet of the duct structure 40. In FIG. 8, the straight portion 164c is omitted. In other embodiments, the straight portion 164c may not be provided.
　油圧ホース１９３は、図８に示すように、ダクト構造４０の内部に配置される。油圧ホース１９３は、ダクト構造４０の入口から出口の経路の全体にわたって配置される。なお、油圧ホース１９３は、ダクト構造４０の入口から出口の経路の一部にのみ配置されてもよい。油圧ホース１９３が接続される油圧機器は、キャブ近接ガード２０（および反キャブ側ガード３０）の内部に収容される（油圧機器は、多数収容されてもよい）。ここで、油圧ホース１９３を、キャブ近接ガード２０の内部から外部に出すためには、キャブ近接ガード２０に開口が必要になる。そこで、油圧ホース１９３を通すための開口として、キャブ近接ガード開口５１（図７参照）が利用される。これにより、油圧ホース１９３を通すためにキャブ近接ガード２０に新たな開口（キャブ近接ガード開口５１以外の開口）を設ける必要がなくなる。油圧ホース１９３を通すための開口として利用できる開口には、キャブ近接ガード開口５１だけでなく、右側側板開口５９、下記の左側側板開口２７１（第２放出開口部）（図１１参照）、および下記の反キャブ側ガード開口２７９（図１１参照）（第２受入開口部）などもある。油圧ホース１９３は、少なくともキャブ近接ガード２０とセンターセクション１０との間を跨ぐように、ダクト構造４０に沿って配設される。 The hydraulic hose 193 is disposed inside the duct structure 40 as shown in FIG. The hydraulic hose 193 is disposed over the entire path from the inlet to the outlet of the duct structure 40. Note that the hydraulic hose 193 may be disposed only in a part of the path from the inlet to the outlet of the duct structure 40. The hydraulic device to which the hydraulic hose 193 is connected is accommodated inside the cab proximity guard 20 (and the anti-cab side guard 30) (a large number of hydraulic devices may be accommodated). Here, in order to take out the hydraulic hose 193 from the inside of the cab proximity guard 20 to the outside, an opening is required in the cab proximity guard 20. Therefore, the cab proximity guard opening 51 (see FIG. 7) is used as an opening for passing the hydraulic hose 193. Accordingly, it is not necessary to provide a new opening (opening other than the cab proximity guard opening 51) in the cab proximity guard 20 in order to pass the hydraulic hose 193. The openings that can be used as openings for passing the hydraulic hose 193 include not only the cab proximity guard opening 51 but also the right side plate opening 59, the following left side plate opening 271 (second discharge opening) (see FIG. 11), and the following There is also an anti-cab side guard opening 279 (see FIG. 11) (second receiving opening). The hydraulic hose 193 is disposed along the duct structure 40 so as to straddle at least between the cab proximity guard 20 and the center section 10.
　この油圧ホース１９３に代えて、または、油圧ホース１９３に加えて、ダクト構造４０の内部に電線が配置されてもよい。この電線は、例えば束状（ワイヤハーネス）であり、例えば電気制御用であり、例えば電源用などでもよい。この電線が接続される電気機器は、上記の油圧機器と同様に、キャブ近接ガード２０（および反キャブ側ガード３０）の内部に収容される（電気機器は、多数収容されてもよい）。 In place of the hydraulic hose 193 or in addition to the hydraulic hose 193, an electric wire may be arranged inside the duct structure 40. The electric wire is, for example, a bundle (wire harness), for example, for electric control, and may be for power supply, for example. The electrical device to which the electric wire is connected is accommodated inside the cab proximity guard 20 (and the anti-cab side guard 30), as in the case of the hydraulic device described above (a large number of electrical devices may be accommodated).
　図８に示す本変形実施形態に係る上部旋回体１Ｄは次の効果を備えている。上部旋回体１Ｄは、ダクト構造４０の内部に配置される、油圧ホース１９３または電線を備えている（以下、「油圧ホース１９３または電線」を、「油圧ホース１９３」とする）。換言すれば、ダクト構造４０は、油圧ホース１９３または電線をキャブ近接ガード２０の内外間に通すための経路としての機能を備えている。このため、ダクト構造４０が設けられる部分では、ダクト構造４０とは別に、油圧ホース１９３を通すための開口（新たな開口）を設ける必要がない。よって、新たな開口を設けることによる、部材（例えばキャブ近接ガード２０など）の剛性低下をなくすことができる。さらに、新たな開口からの音の放射をなくすことができる。ダクト構造４０によって、風雨などが油圧ホース１９３に当たることを抑制できるので、油圧ホース１９３の劣化を抑制できる。 The upper swing body 1D according to this modified embodiment shown in FIG. 8 has the following effects. The upper swing body 1D includes a hydraulic hose 193 or an electric wire disposed inside the duct structure 40 (hereinafter, “hydraulic hose 193 or electric wire” is referred to as “hydraulic hose 193”). In other words, the duct structure 40 has a function as a path for passing the hydraulic hose 193 or the electric wire between the inside and outside of the cab proximity guard 20. For this reason, in the part in which the duct structure 40 is provided, it is not necessary to provide an opening (new opening) for passing the hydraulic hose 193 separately from the duct structure 40. Therefore, it is possible to eliminate a decrease in rigidity of a member (for example, the cab proximity guard 20) due to provision of a new opening. Furthermore, sound emission from the new opening can be eliminated. Since the duct structure 40 can suppress wind and rain from hitting the hydraulic hose 193, deterioration of the hydraulic hose 193 can be suppressed.
　（第４変形実施形態）
　図９を参照して、本発明の第４変形実施形態に係る上部旋回体１Ｅについて、先の第１実施形態（図１参照）との相違点を説明する。相違点は、右側接続ダクト１５５－５（キャブ近接ガード側接続ダクト）の位置と、右側側板開口５９（図１参照）が設けられない点と、センターダクト６０の構成と、である。 (Fourth modified embodiment)
With reference to FIG. 9, a difference between the upper swing body 1 </ b> E according to the fourth modified embodiment of the present invention and the previous first embodiment (see FIG. 1) will be described. The differences are the position of the right connecting duct 155-5 (cab proximity guard side connecting duct), the point that the right side plate opening 59 (see FIG. 1) is not provided, and the configuration of the center duct 60.
　右側接続ダクト１５５－５（の少なくとも一部）は、右側側板１３ａよりも上側に配置される。例えば、右側接続ダクト１５５－５の下側端部の上下方向の位置は、右側側板１３ａの上側端部の上下方向の位置と等しい（またはほぼ等しい）。キャブ近接ガード開口５１は、右側接続ダクト１５５－５と左右方向において対向するように配置される。右側接続ダクト１５５－５は、直線部１５５ａと、屈曲部１５５ｂと、を備える。直線部１５５ａは、キャブ近接ガード開口５１から、左方に延びる。屈曲部１５５ｂは、直線部１５５ａの左側端部の近傍に配置され、右側側板１３ａよりも左側かつ上側に配置され、流れ方向を左方向から下方向に曲げる。 The right connection duct 155-5 (at least a part thereof) is disposed above the right side plate 13a. For example, the vertical position of the lower end of the right connection duct 155-5 is equal (or substantially equal) to the vertical position of the upper end of the right side plate 13a. The cab proximity guard opening 51 is disposed to face the right connection duct 155-5 in the left-right direction. The right connection duct 155-5 includes a straight portion 155a and a bent portion 155b. The straight portion 155a extends leftward from the cab proximity guard opening 51. The bent portion 155b is disposed in the vicinity of the left end portion of the straight portion 155a, is disposed on the left side and above the right side plate 13a, and bends the flow direction from the left direction to the lower direction.
　センターダクト６０は、先の第１実施形態（図１参照）と異なり、直線部１６５ａと、屈曲部１６５ｂと、直線部１６５ｃと、を備える。直線部１６５ａは、屈曲部１５５ｂから下方に延びている。直線部１６５ａの右側の側面は、右側側板１３ａと兼用される。屈曲部１６５ｂは、直線部１６５ａの下側端部の近傍に配置され、流れ方向を下方向から左方向に曲げる。屈曲部１６５ｂの下側の面は、底板１１と兼用される。直線部１６５ｃは、屈曲部１６５ｂから左方に延びている。直線部１６５ｃの下側の面は、底板１１と兼用される。直線部１６５ｃの下流側の端部の位置は、ダクト構造４０の出口である。 The center duct 60 includes a straight portion 165a, a bent portion 165b, and a straight portion 165c, unlike the first embodiment (see FIG. 1). The straight portion 165a extends downward from the bent portion 155b. The right side surface of the straight portion 165a is also used as the right side plate 13a. The bent portion 165b is disposed in the vicinity of the lower end portion of the straight portion 165a and bends the flow direction from the lower direction to the left direction. The lower surface of the bent portion 165b is also used as the bottom plate 11. The straight line portion 165c extends leftward from the bent portion 165b. The lower surface of the straight portion 165c is also used as the bottom plate 11. The position of the downstream end portion of the straight portion 165 c is the outlet of the duct structure 40.
　本変形実施形態では、右側側板１３ａに右側側板開口５９（図１参照）が設けられない。よって、右側側板１３ａに右側側板開口５９が設けられる場合に比べ、右側側板１３ａの剛性を高くできる。一方、右側側板開口５９を設けることなく、ダクト構造４０内の流れをセンターセクション領域Ａの内部領域Ａ１に導くには、屈曲部１５５ｂなどの流れ方向を曲げる部分が必要になる。そのため、屈曲部１５５ｂを設ける必要がない場合に比べ、ダクト構造４０の内部を流れる空気（排気）の圧損は大きくなる。 In the present modified embodiment, the right side plate opening 59 (see FIG. 1) is not provided in the right side plate 13a. Therefore, the rigidity of the right side plate 13a can be increased as compared with the case where the right side plate opening 59 is provided in the right side plate 13a. On the other hand, in order to guide the flow in the duct structure 40 to the inner region A1 of the center section region A without providing the right side plate opening 59, a portion for bending the flow direction such as the bent portion 155b is required. For this reason, the pressure loss of the air (exhaust gas) flowing inside the duct structure 40 becomes larger than when it is not necessary to provide the bent portion 155b.
　（第５変形実施形態）
　図１０を参照して、本発明の第５変形実施形態に係る上部旋回体１Ｆについて、先の第４変形実施形態（図９参照）との相違点を説明する。相違点は、キャブ近接ガード開口１５１の位置と、右側接続ダクト１５５－６（キャブ近接ガード側接続ダクト）の位置と、底板開口１５８（第１受入開口部）がある点と、センターダクト６０の構成と、である。 (Fifth modified embodiment)
With reference to FIG. 10, a difference between the upper swing body 1 </ b> F according to the fifth modified embodiment of the present invention and the previous fourth modified embodiment (see FIG. 9) will be described. The difference is that the position of the cab proximity guard opening 151, the position of the right connection duct 155-6 (cab proximity guard side connection duct), the bottom plate opening 158 (first receiving opening), and the center duct 60 Configuration.
　キャブ近接ガード開口１５１は、次のように配置される。図９に示す第４変形実施形態などでは、キャブ近接ガード開口５１は、キャブ近接ガード２０の左側の側面に形成された。一方、図１０に示す本変形実施形態では、キャブ近接ガード開口１５１は、例えばキャブ近接ガード２０の底面（下側の面）に形成される。 The cab proximity guard opening 151 is arranged as follows. In the fourth modified embodiment shown in FIG. 9 and the like, the cab proximity guard opening 51 is formed on the left side surface of the cab proximity guard 20. On the other hand, in this modified embodiment shown in FIG. 10, the cab proximity guard opening 151 is formed, for example, on the bottom surface (lower surface) of the cab proximity guard 20.
　右側接続ダクト１５５－６（キャブ近接ガード側接続ダクト）は、右側側板１３ａよりも下側に配置される。右側接続ダクト１５５－６は、屈曲部１５５ｓと、直線部１５５ｔと、屈曲部１５５ｕと、を備える。屈曲部１５５ｓは、キャブ近接ガード開口１５１の近傍に配置され、キャブ近接ガード開口１５１よりも下側に配置され、流れ方向を下方向から左方向に曲げる。直線部１５５ｔは、屈曲部１５５ｓから左方に延びている。直線部１５５ｔの上側の面は、底板１１と兼用される。屈曲部１５５ｕは、直線部１５５ｔの左側端部の近傍に配置され、流れ方向を左方向から上方向に曲げる。 The right connection duct 155-6 (cab proximity guard side connection duct) is disposed below the right side plate 13a. The right connection duct 155-6 includes a bent portion 155s, a straight portion 155t, and a bent portion 155u. The bent portion 155s is disposed in the vicinity of the cab proximity guard opening 151, is disposed below the cab proximity guard opening 151, and bends the flow direction from the downward direction to the left direction. The straight portion 155t extends to the left from the bent portion 155s. The upper surface of the straight portion 155t is also used as the bottom plate 11. The bent portion 155u is disposed in the vicinity of the left end portion of the straight portion 155t and bends the flow direction from the left to the upper.
　底板開口１５８は、底板１１に形成される開口であり、底板１１を上下方向に沿って貫通する貫通孔である。底板開口１５８は、右側接続ダクト１５５－６と、センターダクト６０と、を連通させる。センターダクト６０は、屈曲部１６６ａを備える。屈曲部１６６ａは、底板開口１５８の近傍に配置され、流れ方向を上方向から左方向に曲げる。 The bottom plate opening 158 is an opening formed in the bottom plate 11 and is a through-hole penetrating the bottom plate 11 along the vertical direction. The bottom plate opening 158 allows the right connection duct 155-6 and the center duct 60 to communicate with each other. The center duct 60 includes a bent portion 166a. The bent portion 166a is disposed in the vicinity of the bottom plate opening 158 and bends the flow direction from the upper direction to the left direction.
　（第２実施形態）
　図１１および図１２を参照して、本発明の第２実施形態に係る上部旋回体２０１Ａについて、先の第１実施形態（図１参照）との相違点を説明する。相違点は、センターダクト６０の構成と、ダクト構造４０の出口の位置と、である。図１１に示すように、上部旋回体２０１Ａは、第１実施形態にはない、左側側板開口２７１と、左側接続ダクト２７５（反キャブ側接続ガイド）と、反キャブ側ガード開口２７９（第２受入開口部）と、を備える。 (Second Embodiment)
With reference to FIG. 11 and FIG. 12, a difference between the upper swing body 201 </ b> A according to the second embodiment of the present invention and the previous first embodiment (see FIG. 1) will be described. The difference is the configuration of the center duct 60 and the position of the outlet of the duct structure 40. As shown in FIG. 11, the upper swing body 201A includes a left side plate opening 271, a left side connection duct 275 (anti-cab side connection guide), and an anti cab side guard opening 279 (second receiving) that are not in the first embodiment. An opening).
　センターダクト６０は、第１実施形態の直線部６１ａ（図１参照）に代えて、直線部２６１ａを備える。第１実施形態の直線部６１ａに対する、直線部２６１ａの相違点は次の通りである。図１に示すように、第１実施形態の直線部６１ａの下流側の端部は、左側側板１３ｂよりも右側（センターセクション領域Ａ）に配置された。一方、図１１に示すように、本実施形態の直線部２６１ａの下流側の端部は、左側側板１３ｂ（左側側板開口２７１）に接続される。 The center duct 60 includes a straight portion 261a instead of the straight portion 61a (see FIG. 1) of the first embodiment. The difference between the straight line portion 261a and the straight line portion 61a of the first embodiment is as follows. As shown in FIG. 1, the downstream end of the linear portion 61a of the first embodiment is disposed on the right side (center section region A) of the left side plate 13b. On the other hand, as shown in FIG. 11, the downstream end of the linear portion 261a of the present embodiment is connected to the left side plate 13b (left side plate opening 271).
　左側側板開口２７１（第２放出開口部）は、左側側板１３ｂ（右側側板開口５９とは異なる位置）に形成される開口であり、左側側板１３ｂを左右方向に沿って貫通する貫通孔である。左側側板開口２７１は、センターダクト６０と連通する。左側側板開口２７１は、センターセクション１０の剛性ができるだけ低下しない位置に形成されることが好ましい（右側側板開口５９と同様）。左側側板開口２７１は、当該左側側板開口２７１を通じてセンターセクション１０の内部空間から音が放出されることを許容する。 The left side plate opening 271 (second discharge opening) is an opening formed in the left side plate 13b (position different from the right side plate opening 59), and is a through-hole penetrating the left side plate 13b along the left-right direction. The left side plate opening 271 communicates with the center duct 60. The left side plate opening 271 is preferably formed at a position where the rigidity of the center section 10 is not lowered as much as possible (similar to the right side plate opening 59). The left side plate opening 271 allows sound to be emitted from the internal space of the center section 10 through the left side plate opening 271.
　左側接続ダクト２７５（反キャブ側接続ガイド）は、反キャブ側ガード開口２７９と、センターダクト６０とを連通させる（接続する）ダクトである。左側接続ダクト２７５は、左側側板開口２７１と連通する。左側接続ダクト２７５は、左側側板１３ｂと反キャブ側ガード３０との間に配置される。左側接続ダクト２７５での流れ方向は左方向である。左側接続ダクト２７５は、音が左側側板開口２７１から反キャブ側ガード開口２７９に向かって進行するように前記音をガイドする。 The left connection duct 275 (anti-cab side connection guide) is a duct that connects (connects) the anti-cab side guard opening 279 and the center duct 60. The left connection duct 275 communicates with the left side plate opening 271. The left connection duct 275 is disposed between the left side plate 13 b and the anti-cab side guard 30. The flow direction in the left connection duct 275 is the left direction. The left connection duct 275 guides the sound so that the sound travels from the left side plate opening 271 toward the anti-cab side guard opening 279.
　反キャブ側ガード開口２７９は、反キャブ側ガード３０に形成される開口であり、反キャブ側ガード３０の右側の側壁を左右方向に沿って貫通する貫通孔である。反キャブ側ガード開口２７９は、左側側板１３ｂと左右方向において互いに対向する位置に配置される。反キャブ側ガード開口２７９は、左側接続ダクト２７５と連通する。反キャブ側ガード開口２７９は、左側接続ダクト２７５および左側側板開口２７１を介して、センターダクト６０と連通する。反キャブ側ガード開口２７９は、ダクト構造４０の出口である。なお、図１２では、左側接続ダクト２７５および反キャブ側ガード開口２７９が省略されている。反キャブ側ガード開口２７９は、左側側板開口２７１を通じて放出された音が反キャブ側ガード開口２７９を通じて反キャブ側ガード３０の内部に受け入れられることを許容する。 The anti-cab side guard opening 279 is an opening formed in the anti-cab side guard 30 and is a through hole penetrating the right side wall of the anti-cab side guard 30 along the left-right direction. The anti-cab side guard opening 279 is disposed at a position facing the left side plate 13b in the left-right direction. The anti-cab side guard opening 279 communicates with the left connection duct 275. The anti-cab side guard opening 279 communicates with the center duct 60 via the left connection duct 275 and the left side plate opening 271. The anti-cab side guard opening 279 is the outlet of the duct structure 40. In FIG. 12, the left connection duct 275 and the anti-cab side guard opening 279 are omitted. The anti-cab side guard opening 279 allows sound emitted through the left side plate opening 271 to be received inside the anti-cab side guard 30 through the anti-cab side guard opening 279.
　（音の経路について）
　図１１に示すキャブ近接ガード２０の内部の音（排気も同様）は、上流側から下流側の順に、次のように伝わる。第１実施形態（図１参照）と同様に、キャブ近接ガード２０の内部の音は、センターダクト６０の内部に伝わる。この音は、左側側板開口２７１の内部、左側接続ダクト２７５の内部、および、反キャブ側ガード開口２７９の内部を介して、反キャブ側ガード３０の内部に伝わる。この際、右側接続ダクト５５、センターダクト６０および左側接続ダクト２７５は、キャブ近接ガード開口５１、右側側板開口５９、左側側板開口２７１および反キャブ側ガード開口２７９を通じて、音がキャブ近接ガード２０からセンターセクション１０の内部空間、更には反キャブ側ガード３０の内部に進行するように音をガイドする。 (Sound path)
The sound inside the cab proximity guard 20 shown in FIG. 11 (similar to exhaust) is transmitted in the following order from the upstream side to the downstream side. Similar to the first embodiment (see FIG. 1), the sound inside the cab proximity guard 20 is transmitted to the inside of the center duct 60. This sound is transmitted to the inside of the anti-cab side guard 30 through the inside of the left side plate opening 271, the inside of the left side connection duct 275, and the inside of the anti cab side guard opening 279. At this time, the right connection duct 55, the center duct 60, and the left connection duct 275 pass through the cab proximity guard 20 through the cab proximity guard opening 51, the right side plate opening 59, the left side plate opening 271 and the anti-cab side guard opening 279. The sound is guided so as to travel into the internal space of the section 10 and further into the anti-cab side guard 30.
　（音の減衰について）
　第１実施形態（図１参照）と同様に、ダクト構造４０の内部を通る音は、距離減衰により減音される。ここで、第１実施形態に比べ、第２実施形態では、ダクト構造４０の入口から出口までの左右方向の距離を長くできるので、距離減衰による減音効果を大きくできる。ダクト構造４０の内部から反キャブ側ガード３０の内部に放射された音は、回折減衰により減音される。反キャブ側ガード３０の内部から、反キャブ側ガード３０の隙間などを通じて、反キャブ側ガード３０の外部に放射される音は、回折減衰により減音される。反キャブ側ガード３０の内部から、反キャブ側ガード３０を構成する面（ガード面）を透過する音は、透過損失により減音される。その結果、第１実施形態に比べ、キャブ２５に伝わる音がより低減され、キャブ２５内の騒音がより低減される。 (About sound attenuation)
Similar to the first embodiment (see FIG. 1), the sound passing through the duct structure 40 is reduced by distance attenuation. Here, compared to the first embodiment, in the second embodiment, since the distance in the left-right direction from the inlet to the outlet of the duct structure 40 can be increased, the sound reduction effect due to distance attenuation can be increased. Sound radiated from the inside of the duct structure 40 to the inside of the anti-cab side guard 30 is reduced by diffraction attenuation. Sound radiated from the inside of the anti-cab side guard 30 through the gap of the anti-cab side guard 30 to the outside of the anti-cab side guard 30 is reduced by diffraction attenuation. Sound that passes through the surface (guard surface) constituting the anti-cab side guard 30 from the inside of the anti-cab side guard 30 is reduced by transmission loss. As a result, compared with the first embodiment, the sound transmitted to the cab 25 is further reduced, and the noise in the cab 25 is further reduced.
　（吸音材について）
　反キャブ側ガード３０の内部（例えば内面）に吸音材が設けられてもよい。この場合、反キャブ側ガード３０の内部の音が、吸音材により吸音される。その結果、キャブ２５に伝わる音がより低減される。 (About sound absorbing material)
A sound absorbing material may be provided inside (for example, the inner surface of) the anti-cab side guard 30. In this case, the sound inside the anti-cab side guard 30 is absorbed by the sound absorbing material. As a result, the sound transmitted to the cab 25 is further reduced.
　図１１に示す上部旋回体２０１Ａは次の効果を備えている。上部旋回体２０１Ａは、反キャブ側ガード３０を備える。反キャブ側ガード３０は、センターセクション１０に対して、キャブ近接ガード２０およびキャブ２５が配置される側（右側）とは反対側（左側）に配置される。ダクト構造４０は、反キャブ側ガード開口２７９を備える。反キャブ側ガード開口２７９は、反キャブ側ガード３０に形成される開口であり、センターダクト６０と連通する。このため、キャブ近接ガード２０の内部の音は、ダクト構造４０を介して、反キャブ側ガード３０の内部に伝わる。よって、ダクト構造４０は、キャブ２５からの左右方向の距離がより遠い位置（例えばセンターセクション１０よりも遠い位置）に、音を伝えることができる。よって、キャブ２５内の騒音をより抑制できる。 The upper turning body 201A shown in FIG. 11 has the following effects. The upper swing body 201 </ b> A includes an anti-cab side guard 30. The anti-cab side guard 30 is arranged on the side (left side) opposite to the side (right side) where the cab proximity guard 20 and the cab 25 are arranged with respect to the center section 10. The duct structure 40 includes an anti-cab side guard opening 279. The anti-cab side guard opening 279 is an opening formed in the anti-cab side guard 30 and communicates with the center duct 60. For this reason, the sound inside the cab proximity guard 20 is transmitted to the inside of the anti-cab side guard 30 via the duct structure 40. Therefore, the duct structure 40 can transmit sound to a position where the distance in the left-right direction from the cab 25 is farther (for example, a position farther than the center section 10). Therefore, the noise in the cab 25 can be further suppressed.
　また、本実施形態では、ダクト構造４０は、センターダクト６０と反キャブ側ガード開口２７９とを連通させる左側接続ダクト２７５を備える。このため、反キャブ側ガード開口２７９とセンターダクト６０との間で、ダクト構造４０の内部から外部へ、音が漏れにくい。よって、キャブ２５内の騒音をより抑制できる。 In this embodiment, the duct structure 40 includes a left connection duct 275 that allows the center duct 60 and the anti-cab side guard opening 279 to communicate with each other. For this reason, it is difficult for sound to leak from the inside of the duct structure 40 to the outside between the anti-cab side guard opening 279 and the center duct 60. Therefore, the noise in the cab 25 can be further suppressed.
　（第６変形実施形態）
　図１３を参照して、本発明の第６変形実施形態に係る上部旋回体２０１Ｂについて、先の第２実施形態（図１１参照）との相違点を説明する。相違点は、センターダクト６０の構成である。センターダクト６０は、先の第２変形実施形態（図５参照）と同様の、屈曲部１６２ａと、直線部１６２ｂと、屈曲部１６３ａと、を備える。さらに、センターダクト６０は、直線部２６２ａを備える。直線部２６２ａは、屈曲部１６３ａから左方に延びている。直線部２６２ａの下流側の端部は、左側側板１３ｂ（左側側板開口２７１）に接続される。 (Sixth modified embodiment)
With reference to FIG. 13, a difference between the upper swing body 201B according to the sixth modified embodiment of the present invention and the previous second embodiment (see FIG. 11) will be described. The difference is the configuration of the center duct 60. The center duct 60 includes a bent portion 162a, a straight portion 162b, and a bent portion 163a, which are the same as those in the second modified embodiment (see FIG. 5). Further, the center duct 60 includes a straight portion 262a. The straight portion 262a extends leftward from the bent portion 163a. The downstream end of the straight portion 262a is connected to the left side plate 13b (left side plate opening 271).
　（第７変形実施形態）
　図１４を参照して、本発明の第７変形実施形態に係る上部旋回体２０１Ｃについて、先の第２実施形態（図１１参照）との相違点を説明する。相違点は、センターダクト６０の構成である。センターダクト６０は、先の第３変形実施形態（図６参照）と同様の直線部６１ａと、屈曲部１６４ａと、拡張縮小部１６４ｂと、を備える。さらに、センターダクト６０は、屈曲部２６３ａと、直線部２６３ｂと、を備える。屈曲部２６３ａは、拡張縮小部１６４ｂの後側端部の近傍に配置され、流れ方向を後方向から左方向に曲げる。直線部２６３ｂは、屈曲部２６３ａから左方に延びている。直線部２６３ｂの下流側の端部は、左側側板１３ｂ（左側側板開口２７１）に接続される。直線部２６３ｂの、前側部分かつ左側部分の面は、拡張縮小部１６４ｂと兼用される。 (Seventh modified embodiment)
With reference to FIG. 14, a difference between the upper swing body 201C according to the seventh modified embodiment of the present invention and the previous second embodiment (see FIG. 11) will be described. The difference is the configuration of the center duct 60. The center duct 60 includes a linear portion 61a, a bent portion 164a, and an expansion / reduction portion 164b similar to those of the third modified embodiment (see FIG. 6). Furthermore, the center duct 60 includes a bent portion 263a and a straight portion 263b. The bent portion 263a is disposed in the vicinity of the rear end portion of the expansion / reduction portion 164b and bends the flow direction from the rear direction to the left direction. The straight portion 263b extends leftward from the bent portion 263a. The downstream end of the straight line portion 263b is connected to the left side plate 13b (left side plate opening 271). The front and left side surfaces of the straight portion 263b are also used as the expansion / contraction portion 164b.
　（第３実施形態）
　図１５および図１６を参照して、本発明の第３実施形態に係る上部旋回体３０１Ａについて、先の第２実施形態（図１１参照）との相違点を説明する。ダクト構造４０の出口は、図１１に示す第２実施形態では反キャブ側ガード開口２７９に配置されていたが、図１５に示す本実施形態では反キャブ側ガード３０の内部に配置されている。ダクト構造４０は、左側接続ダクト様構造３７５（反キャブ側接続ダクト様構造）を備える。上部旋回体３０１Ａは、左側ダクト３８０（反キャブ側ガード内部ガイド）を備える。 (Third embodiment)
With reference to FIG. 15 and FIG. 16, the difference between the upper swing body 301 </ b> A according to the third embodiment of the present invention and the previous second embodiment (see FIG. 11) will be described. The outlet of the duct structure 40 is disposed in the anti-cab side guard opening 279 in the second embodiment illustrated in FIG. 11, but is disposed in the anti-cab side guard 30 in the present embodiment illustrated in FIG. 15. The duct structure 40 includes a left connection duct-like structure 375 (an anti-cab side connection duct-like structure). The upper swing body 301A includes a left duct 380 (an anti-cab side guard internal guide).
　左側接続ダクト様構造３７５は、第２実施形態における左側接続ダクト２７５（図１１参照）の位置周辺に設けられる。左側接続ダクト様構造３７５は、図１５に示すように、空間的に略連通するように配置された左側側板開口２７１（上流部）と反キャブ側ガード開口２７９（下流部）とにより構成される、ダクト様構造である。左側接続ダクト様構造３７５は、センターダクト６０と反キャブ側ガード開口２７９とを、空間的に略連通させる。 The left connection duct-like structure 375 is provided around the position of the left connection duct 275 (see FIG. 11) in the second embodiment. As shown in FIG. 15, the left connection duct-like structure 375 includes a left side plate opening 271 (upstream part) and an anti-cab side guard opening 279 (downstream part) arranged so as to be substantially spatially communicated. It is a duct-like structure. The left connection duct-like structure 375 makes the center duct 60 and the anti-cab side guard opening 279 substantially communicate spatially.
　左側ダクト３８０は、反キャブ側ガード開口２７９から反キャブ側ガード３０の内部に延びるように配置されるダクトである。左側ダクト３８０は、反キャブ側ガード開口２７９と連通する。左側ダクト３８０は、反キャブ側ガード３０内への音の進行をガイドする。左側ダクト３８０は、屈曲部３８１ａと、直線部３８１ｂと、屈曲部３８１ｃと、を備える。屈曲部３８１ａは、反キャブ側ガード開口２７９の近傍に配置され、流れ方向を左方向から後方向に曲げる。直線部３８１ｂは、屈曲部３８１ａから後方に延びている。左側ダクト３８０の一部は、反キャブ側ガード３０を構成する部材と兼用される。具体的には、直線部３８１ｂの右側の面は、反キャブ側ガード３０の右側の面（側面）と兼用される（屈曲部３８１ｃの右側の面も同様）。屈曲部３８１ｃは、直線部３８１ｂの後側端部の近傍に配置され、流れ方向を後方向から左方向に曲げる。屈曲部３８１ｃの下流側の端部は、ダクト構造４０の出口である。なお、図１６では、図１５に示す左側接続ダクト２７５および反キャブ側ガード開口２７９が省略されている。 The left duct 380 is a duct disposed so as to extend from the anti-cab side guard opening 279 to the inside of the anti-cab side guard 30. The left duct 380 communicates with the anti-cab side guard opening 279. The left duct 380 guides the progress of sound into the anti-cab side guard 30. The left duct 380 includes a bent portion 381a, a straight portion 381b, and a bent portion 381c. The bent portion 381a is disposed in the vicinity of the anti-cab side guard opening 279 and bends the flow direction from the left to the rear. The straight portion 381b extends rearward from the bent portion 381a. A part of the left duct 380 is also used as a member constituting the anti-cab side guard 30. Specifically, the right surface of the straight portion 381b is also used as the right surface (side surface) of the anti-cab side guard 30 (the same applies to the right surface of the bent portion 381c). The bent portion 381c is disposed in the vicinity of the rear end portion of the straight portion 381b and bends the flow direction from the rear direction to the left direction. The downstream end of the bent portion 381 c is an outlet of the duct structure 40. In FIG. 16, the left connection duct 275 and the anti-cab side guard opening 279 shown in FIG. 15 are omitted.
　（音の経路について）
　図１１に示す第２実施形態では、反キャブ側ガード開口２７９から反キャブ側ガード３０の内部に音が放射されたが、図１５に示す第３実施形態では、左側ダクト３８０の下流側の端部から反キャブ側ガード３０の内部に音が放射される。この際、右側接続ダクト５５、センターダクト６０および左側接続ダクト２７５は、キャブ近接ガード開口５１、右側側板開口５９、左側側板開口２７１および反キャブ側ガード開口２７９を通じて、音がキャブ近接ガード２０からセンターセクション１０の内部空間、更には反キャブ側ガード３０の内部に進行するように音をガイドする。 (Sound path)
In the second embodiment shown in FIG. 11, sound is radiated from the anti-cab side guard opening 279 into the anti-cab side guard 30, but in the third embodiment shown in FIG. 15, the downstream end of the left duct 380. Sound is emitted from the portion into the anti-cab side guard 30. At this time, the right connection duct 55, the center duct 60, and the left connection duct 275 pass through the cab proximity guard 20 through the cab proximity guard opening 51, the right side plate opening 59, the left side plate opening 271 and the anti-cab side guard opening 279. The sound is guided so as to travel into the internal space of the section 10 and further into the anti-cab side guard 30.
　また、本実施形態では、図１５に示すように、ダクト構造４０は、センターダクト６０と反キャブ側ガード開口２７９とを空間的に略連通させる左側接続ダクト様構造３７５を備える。このため、左側接続ダクト２７５（図１１参照）が設けられない場合でも、左側接続ダクト様構造３７５の上流部（左側側板開口２７１を介したセンターダクト６０）から下流部（反キャブ側ガード開口２７９）へ音を伝えることができる。よって、キャブ２５の騒音を抑制できる。 In this embodiment, as shown in FIG. 15, the duct structure 40 includes a left connection duct-like structure 375 that substantially communicates the center duct 60 and the anti-cab side guard opening 279 in space. For this reason, even if the left connection duct 275 (see FIG. 11) is not provided, the upstream portion (center duct 60 via the left side plate opening 271) to the downstream portion (anti-cab side guard opening 279) of the left connection duct-like structure 375. ). Therefore, the noise of the cab 25 can be suppressed.
　（第４実施形態）
　図１７を参照して、本発明の第４実施形態の上部旋回体４０１Ａについて、先の第３実施形態（図１５参照）との相違点を説明する。相違点は、センターダクト６０の構成と、左側ダクト３８０の構成と、ダクト構造４０の出口の位置と、である。ダクト構造４０の出口の位置は、図１５に示す第３実施形態では反キャブ側ガード３０の内部であったが、図１７に示す第４実施形態では反キャブ側ガード３０の外部と連通する位置である。具体的には、上部旋回体４０１Ａは、左側外部開口４９０（第３放出開口部）を備える。 (Fourth embodiment)
With reference to FIG. 17, a difference between the upper swing body 401A of the fourth embodiment of the present invention and the previous third embodiment (see FIG. 15) will be described. The difference is the configuration of the center duct 60, the configuration of the left duct 380, and the position of the outlet of the duct structure 40. In the third embodiment shown in FIG. 15, the position of the outlet of the duct structure 40 is inside the anti-cab side guard 30, but in the fourth embodiment shown in FIG. 17, a position communicating with the outside of the anti-cab side guard 30. It is. Specifically, the upper swing body 401A includes a left outer opening 490 (third discharge opening).
　センターダクト６０は、第３実施形態の直線部２６１ａ（図１５参照）に代えて、直線部４６１ａと、屈曲部４６１ｂと、直線部４６１ｃと、屈曲部４６１ｄと、を備える。直線部４６１ａは、先の第１実施形態の直線部６１ａ（図１参照）とほぼ同様に構成される。直線部６１ａ（図１参照）に対する直線部４６１ａの相違点は、直線部４６１ａの下流側の端部がダクト構造４０の出口ではない点である。屈曲部４６１ｂは、直線部４６１ａの左側の端部の近傍に配置され、流れ方向を左方向から後方向に曲げる。屈曲部４６１ｂの左側の面は、左側側板１３ｂと兼用される（直線部４６１ｃの左側の面も同様）。直線部４６１ｃは、屈曲部４６１ｂから後方に延びている。屈曲部４６１ｄは、直線部４６１ｃの後側端部の近傍に配置され、流れ方向を後方向から左方向に曲げ、左側側板１３ｂに接続される。 The center duct 60 includes a straight portion 461a, a bent portion 461b, a straight portion 461c, and a bent portion 461d instead of the straight portion 261a (see FIG. 15) of the third embodiment. The straight line portion 461a is configured in substantially the same manner as the straight line portion 61a (see FIG. 1) of the first embodiment. The difference between the straight line part 461a and the straight line part 61a (see FIG. 1) is that the downstream end of the straight line part 461a is not the outlet of the duct structure 40. The bent portion 461b is disposed in the vicinity of the left end portion of the straight portion 461a and bends the flow direction from the left to the rear. The left side surface of the bent portion 461b is also used as the left side plate 13b (the same applies to the left side surface of the straight portion 461c). The straight line portion 461c extends rearward from the bent portion 461b. The bent portion 461d is disposed in the vicinity of the rear end portion of the straight portion 461c, bends the flow direction from the rear direction to the left direction, and is connected to the left side plate 13b.
　左側ダクト３８０は、直線部４８１ａを備える。直線部４８１ａは、反キャブ側ガード開口２７９から左方に延び、反キャブ側ガード３０の左側の面（側面）に接続される。 The left duct 380 includes a straight portion 481a. The straight portion 481 a extends leftward from the anti-cab side guard opening 279 and is connected to the left side surface (side surface) of the anti-cab side guard 30.
　左側外部開口４９０（第３放出開口部）は、反キャブ側ガード３０に形成される開口である。左側外部開口４９０は、反キャブ側ガード３０の左側の面（側面）に配置され、例えば反キャブ側ガード３０の下側部分（例えば下側端部の近傍）に配置される。左側外部開口４９０は、左側ダクト３８０と、反キャブ側ガード３０の外部（上部旋回体４０１Ａの外部）と、を連通させる。左側外部開口４９０は、反キャブ側ガード開口２７９とは別に設けられる（異なる位置に配置される）。左側外部開口４９０は、当該左側外部開口４９０を通じて左側ダクト３８０から反キャブ側ガード３０の外部に音が放出されることを許容する。 The left external opening 490 (third discharge opening) is an opening formed in the anti-cab side guard 30. The left outer opening 490 is disposed on the left side surface (side surface) of the anti-cab side guard 30, and is disposed, for example, in a lower portion (for example, near the lower end portion) of the anti-cab side guard 30. The left external opening 490 allows the left duct 380 to communicate with the outside of the anti-cab side guard 30 (the outside of the upper swing body 401A). The left outer opening 490 is provided separately from the anti-cab side guard opening 279 (disposed at a different position). The left outer opening 490 allows sound to be emitted from the left duct 380 to the outside of the anti-cab side guard 30 through the left outer opening 490.
　（音の経路について）
　キャブ近接ガード２０の内部の音（排気も同様）は、上流側から下流側の順に、次のように伝わる。先の第２実施形態（図１１参照）と同様に、キャブ近接ガード２０の内部の音は、反キャブ側ガード開口２７９の内部に伝わる。この音は、左側ダクト３８０の内部、および左側外部開口４９０の内部を介して、反キャブ側ガード３０の外部（上部旋回体４０１Ａの外部）に伝わる（放射される）。また、この音と同様に、ファン２２が発生させた冷却風も、上部旋回体４０１Ａの外部に排気される。この際、右側接続ダクト５５、センターダクト６０、左側接続ダクト２７５および左側ダクト３８０は、キャブ近接ガード開口５１、右側側板開口５９、左側側板開口２７１、反キャブ側ガード開口２７９および左側外部開口４９０を通じて、音がキャブ近接ガード２０からセンターセクション１０の内部空間、反キャブ側ガード３０の内部、更には反キャブ側ガード３０の外部に進行するように音をガイドする。 (Sound path)
Sound inside the cab proximity guard 20 (similar to exhaust) is transmitted in the following order from the upstream side to the downstream side. Similar to the second embodiment (see FIG. 11), the sound inside the cab proximity guard 20 is transmitted to the inside of the anti-cab side guard opening 279. This sound is transmitted (radiated) to the outside of the anti-cab side guard 30 (outside the upper swing body 401A) through the inside of the left duct 380 and the inside of the left external opening 490. Further, similarly to this sound, the cooling air generated by the fan 22 is exhausted to the outside of the upper swing body 401A. At this time, the right connection duct 55, the center duct 60, the left connection duct 275, and the left duct 380 pass through the cab proximity guard opening 51, the right side plate opening 59, the left side plate opening 271, the anti-cab side guard opening 279, and the left external opening 490. The sound is guided so that the sound travels from the cab proximity guard 20 to the inner space of the center section 10, the inside of the anti-cab side guard 30, and the outside of the anti-cab side guard 30.
　（音の減衰などについて）
　第２実施形態（図１１参照）と同様に、ダクト構造４０の内部を通る音は、距離減衰により減音される。ここで、第２実施形態（図１１参照）に比べ、第４実施形態では、ダクト構造４０の入口から出口までの左右方向の距離を長くできるので、距離減衰による減音効果を大きくできる。また、左側外部開口４９０から反キャブ側ガード３０の外部に放射される音は、回折減衰により減音される。 (About sound attenuation etc.)
Similar to the second embodiment (see FIG. 11), the sound passing through the inside of the duct structure 40 is reduced by distance attenuation. Here, compared with 2nd Embodiment (refer FIG. 11), in 4th Embodiment, since the distance of the left-right direction from the entrance of the duct structure 40 to an exit can be lengthened, the sound reduction effect by distance attenuation | damping can be enlarged. Further, the sound radiated from the left external opening 490 to the outside of the anti-cab side guard 30 is reduced by diffraction attenuation.
　図１７に示す上部旋回体４０１Ａは次の効果を備えている。ダクト構造４０は、左側ダクト３８０と、左側外部開口４９０と、を備える。左側ダクト３８０は、反キャブ側ガード３０の内部に配置され、反キャブ側ガード開口２７９と連通する。また、左側外部開口４９０は、反キャブ側ガード３０に形成される開口であり、反キャブ側ガード開口２７９とは別に設けられ、左側ダクト３８０と反キャブ側ガード３０の外部とを連通させる。このため、キャブ近接ガード２０の内部の騒音は、左側ダクト３８０の内部、および左側外部開口４９０を介して、反キャブ側ガード３０の外部に伝わる。よって、ダクト構造４０は、キャブ２５からの左右方向の距離がより遠い位置（例えばセンターセクション領域Ａよりも遠い位置）に、音を伝えることができる。よって、キャブ２５内の騒音をより抑制できる。 The upper swing body 401A shown in FIG. 17 has the following effects. The duct structure 40 includes a left duct 380 and a left external opening 490. The left duct 380 is disposed inside the anti-cab side guard 30 and communicates with the anti-cab side guard opening 279. Further, the left outer opening 490 is an opening formed in the anti-cab side guard 30 and is provided separately from the anti-cab side guard opening 279 and communicates the left duct 380 and the outside of the anti-cab side guard 30. For this reason, the noise inside the cab proximity guard 20 is transmitted to the outside of the anti-cab side guard 30 through the inside of the left duct 380 and the left outside opening 490. Therefore, the duct structure 40 can transmit sound to a position where the distance in the left-right direction from the cab 25 is farther (for example, a position farther than the center section region A). Therefore, the noise in the cab 25 can be further suppressed.
　（第８変形実施形態）
　図１８を参照して、本発明の第８変形実施形態に係る上部旋回体４０１Ｂについて、先の第４実施形態（図１７参照）との相違点を説明する。相違点は、センターダクト６０の構成が先の第３実施形態（図１５参照）と同様である点と、左側ダクト３８０の構成と、である。左側ダクト３８０は、第４実施形態の直線部４８１ａ（図１７参照）に代えて、屈曲部４８２ａと、直線部４８２ｂと、屈曲部４８２ｃと、直線部４８２ｄと、を備える。屈曲部４８２ａは、反キャブ側ガード開口２７９の近傍に配置され、流れ方向を左方向から後方向に曲げる。直線部４８２ｂは、屈曲部４８２ａから後方に延びる。直線部４８２ｂの右側の面は、第３実施形態の直線部３８１ｂ（図１５参照）と異なり、左側側板１３ｂと兼用されない。屈曲部４８２ｃは、直線部４８２ｂの後側端部の近傍に設けられ、流れ方向を後方向から左方向に曲げる。直線部４８２ｄは、屈曲部４８２ｃから左方に延びている。直線部４８２ｄの下流側の端部は、反キャブ側ガード３０の左側の面に接続され、左側外部開口４９０と連通する。 (Eighth modified embodiment)
With reference to FIG. 18, the difference with respect to upper 4th Embodiment (refer FIG. 17) is demonstrated about the upper turning body 401B which concerns on 8th modification embodiment of this invention. The difference is that the configuration of the center duct 60 is the same as that of the third embodiment (see FIG. 15), and the configuration of the left duct 380. The left duct 380 includes a bent portion 482a, a straight portion 482b, a bent portion 482c, and a straight portion 482d instead of the straight portion 481a (see FIG. 17) of the fourth embodiment. The bent portion 482a is disposed in the vicinity of the anti-cab side guard opening 279 and bends the flow direction from the left to the rear. The straight portion 482b extends rearward from the bent portion 482a. Unlike the straight line portion 381b (see FIG. 15) of the third embodiment, the right side surface of the straight line portion 482b is not used as the left side plate 13b. The bent portion 482c is provided in the vicinity of the rear end portion of the straight portion 482b and bends the flow direction from the rear direction to the left direction. The straight portion 482d extends to the left from the bent portion 482c. The downstream end of the straight portion 482d is connected to the left side surface of the anti-cab side guard 30 and communicates with the left external opening 490.
　（第９変形実施形態）
　図１９および図２０を参照して、本発明の第９変形実施形態に係る上部旋回体４０１Ｃについて、先の第４実施形態（図１７参照）との相違点を説明する。相違点は、左側ダクト３８０の構成である。左側ダクト３８０は、第４実施形態の直線部４８１ａ（図１７参照）に代えて、直線部４８３ａと、屈曲部４８３ｂと、図２０に示す直線部４８３ｃと、屈曲部４８３ｄと、を備える。直線部４８３ａは、第４実施形態の直線部４８１ａ（図１７参照）とほぼ同様に構成される。直線部４８３ａの下流側の端部は、直線部４８１ａと異なり、左側外部開口４９０に直接には接続されない。屈曲部４８３ｂは、直線部４８３ａの左側端部の近傍に配置され、流れ方向を左方向から上方向に曲げる。屈曲部４８３ｂの左側の面は、反キャブ側ガード３０の左側の面と兼用される（直線部４８３ｃの左側の面も同様）。直線部４８３ｃは、屈曲部４８３ｂから上方に延びている。屈曲部４８３ｄは、直線部４８３ｃの上側端部の近傍に配置され、流れ方向を上方向から左方向に曲げ、反キャブ側ガード３０の左側の側面に接続される。屈曲部４８３ｄの上側の面は、反キャブ側ガード３０の上側の面と兼用される。左側外部開口４９０は、例えば、反キャブ側ガード３０の上側端部の近傍に配置され、屈曲部４８３ｄと連通する。 (Ninth modified embodiment)
With reference to FIG. 19 and FIG. 20, the difference with respect to upper 4th Embodiment (refer FIG. 17) is demonstrated about the upper turning body 401C which concerns on 9th modification embodiment of this invention. The difference is the configuration of the left duct 380. The left duct 380 includes a straight portion 483a, a bent portion 483b, a straight portion 483c, and a bent portion 483d shown in FIG. 20 instead of the straight portion 481a (see FIG. 17) of the fourth embodiment. The straight portion 483a is configured in substantially the same manner as the straight portion 481a (see FIG. 17) of the fourth embodiment. Unlike the straight line part 481a, the downstream end part of the straight line part 483a is not directly connected to the left external opening 490. The bent portion 483b is disposed in the vicinity of the left end portion of the linear portion 483a, and bends the flow direction from the left direction to the upward direction. The left side surface of the bent portion 483b is also used as the left side surface of the anti-cab side guard 30 (the same applies to the left side surface of the straight portion 483c). The straight portion 483c extends upward from the bent portion 483b. The bent portion 483d is disposed in the vicinity of the upper end portion of the linear portion 483c, bends the flow direction from the upper direction to the left direction, and is connected to the left side surface of the anti-cab side guard 30. The upper surface of the bent portion 483d is also used as the upper surface of the anti-cab side guard 30. The left outer opening 490 is disposed, for example, in the vicinity of the upper end portion of the anti-cab side guard 30 and communicates with the bent portion 483d.
　（第１０変形実施形態）
　図２１を参照して、本発明の第１０変形実施形態の上部旋回体４０１Ｄについて、先の第４実施形態（図１７参照）との相違点を説明する。相違点は、センターダクト６０が第７変形実施形態（図１４参照）と同様である点と、左側ダクト３８０の構成と、である。左側ダクト３８０は、第４実施形態の直線部４８１ａ（図１７参照）に代えて、屈曲部４８４ａと、直線部４８４ｂと、屈曲部４８４ｃと、直線部４８４ｄと、を備える。屈曲部４８４ａは、反キャブ側ガード開口２７９の近傍に配置され、流れ方向を左方向から前方向に曲げる。直線部４８４ｂは、屈曲部４８４ａから前方に延びている。直線部４８４ｂの右側の側面は、反キャブ側ガード３０の右側の側面と兼用される（屈曲部４８４ｃの右側の面も同様）。屈曲部４８４ｃは、直線部４８４ｂの前側端部の近傍に配置され、流れ方向を前方向から左方向に曲げる。直線部４８４ｄは、屈曲部４８４ｃから左方に延びている。直線部４８４ｄの下流側の端部は、反キャブ側ガード３０の左側の面に接続され、左側外部開口４９０と連通する。 (10th modified embodiment)
With reference to FIG. 21, a difference between the upper swing body 401D of the tenth modified embodiment of the present invention and the previous fourth embodiment (see FIG. 17) will be described. The difference is that the center duct 60 is the same as that of the seventh modified embodiment (see FIG. 14) and the configuration of the left duct 380. The left duct 380 includes a bent portion 484a, a straight portion 484b, a bent portion 484c, and a straight portion 484d instead of the straight portion 481a (see FIG. 17) of the fourth embodiment. The bent portion 484a is disposed in the vicinity of the anti-cab side guard opening 279 and bends the flow direction from the left to the front. The straight portion 484b extends forward from the bent portion 484a. The right side surface of the straight portion 484b is also used as the right side surface of the anti-cab side guard 30 (the same applies to the right side surface of the bent portion 484c). The bent portion 484c is disposed in the vicinity of the front end portion of the straight portion 484b and bends the flow direction from the front direction to the left direction. The straight portion 484d extends to the left from the bent portion 484c. The downstream end of the straight portion 484d is connected to the left surface of the anti-cab side guard 30 and communicates with the left external opening 490.
　（第５実施形態）
　図２２を参照して、本発明の第５実施形態に係る上部旋回体５０１Ａについて、第９変形実施形態（図１９参照）との相違点を説明する。相違点は、補助通気装置５９５を備える点である。補助通気装置５９５は、ダクト構造４０の内部の空気が流れやすくなるように補助する装置である。補助通気装置５９５により、ダクト構造４０の内部の圧損が大きい場合でも、ダクト構造４０の内部の空気（排気）をスムーズに流す（排出する）ことが可能となる。補助通気装置５９５は、具体的にはファン（ファン２２とは別のファン）である。補助通気装置５９５は、音源であり、キャブ２５内の騒音増加に影響を与える場合がある。そこで、補助通気装置５９５は、キャブ２５から遠い位置に配置されることが好ましい。具体的には、補助通気装置５９５は、左側ダクト３８０の内部に配置され、例えば、左側ダクト３８０の左側の部分（例えば端部）に配置され、例えば、屈曲部４８３ｂなどに配置される。 (Fifth embodiment)
With reference to FIG. 22, a difference between the upper swing body 501A according to the fifth embodiment of the present invention and the ninth modified embodiment (see FIG. 19) will be described. The difference is that an auxiliary ventilation device 595 is provided. The auxiliary ventilation device 595 is a device that assists the air inside the duct structure 40 to flow easily. The auxiliary ventilation device 595 allows air (exhaust) inside the duct structure 40 to flow (discharge) smoothly even when the pressure loss inside the duct structure 40 is large. The auxiliary ventilation device 595 is specifically a fan (a fan different from the fan 22). The auxiliary ventilation device 595 is a sound source and may affect the increase in noise in the cab 25. Therefore, the auxiliary ventilation device 595 is preferably arranged at a position far from the cab 25. Specifically, the auxiliary ventilation device 595 is disposed inside the left duct 380, and is disposed, for example, at a left portion (for example, an end portion) of the left duct 380, and is disposed at, for example, the bent portion 483b.
　（第１１変形実施形態）
　図２３を参照して、本発明の第１１変形実施形態の上部旋回体５０１Ｂについて、第１０変形実施形態（図２１参照）との相違点を説明する。相違点は、補助通気装置５９５を備える点である。補助通気装置５９５は、センターダクト６０の内部に配置され、例えば、拡張縮小部１６４ｂの内部などに配置される。 (Eleventh modified embodiment)
With reference to FIG. 23, the difference between the upper-part turning body 501B of the eleventh modified embodiment of the present invention and the tenth modified embodiment (see FIG. 21) will be described. The difference is that an auxiliary ventilation device 595 is provided. The auxiliary ventilation device 595 is arranged inside the center duct 60, and is arranged, for example, inside the expansion / contraction part 164b.
　上記の各形態は、様々に変形されてもよい。互いに異なる形態の構成要素どうしが組み合わされてもよい。例えば、第１実施形態（図１参照）に対し、第１変形実施形態（図４参照）の右側ダクト４５が付加されてもよい。例えば、第１実施形態（図１参照）の右側接続ダクト５５を、右側接続ダクト様構造１５５－２（図４参照）に代えてもよい。また、上記の各形態の構成要素の数や配置が変更されてもよい。例えば、図１に示す側板１３の数は、２を超えてもよい。また、上記の各形態の構成要素の一部が設けられなくてもよい（下記）。 The above embodiments may be variously modified. Components in different forms may be combined. For example, the right duct 45 of the first modified embodiment (see FIG. 4) may be added to the first embodiment (see FIG. 1). For example, the right connection duct 55 of the first embodiment (see FIG. 1) may be replaced with a right connection duct-like structure 155-2 (see FIG. 4). In addition, the number and arrangement of the constituent elements of each of the above forms may be changed. For example, the number of the side plates 13 shown in FIG. Moreover, a part of component of said each form does not need to be provided (below).
　ダクト構造４０の構成は、下記のように変更されてもよい。ダクト構造４０の入口の位置、出口の位置、長さ、形状などは、変更されてもよい。ダクト構造４０と他の部材との兼用の有無などが変更されてもよい。ダクト構造４０の入口から出口までの経路は、１本でもよく、複数本でもよく、例えば枝分かれしてもよく、合流してもよい。ダクト構造４０の入口は、１か所でもよく、複数か所でもよい（出口も同様）。ダクト構造４０の断面形状は、入口から出口まで一定（例えば長方形）でもよく、経路の途中で変化してもよい。ダクト構造４０は、上記各実施形態では排気ダクトであったが、吸気ダクトでもよい（ダクト構造４０の入口は吸気口でもよい）。さらに詳しくは、ダクト構造４０の内部には、ファン２２に吸い込まれる前の空気（吸気）が流れてもよい。ダクト構造４０の内部には、ファン２２が発生させた冷却風が流れなくてもよい。ダクト構造４０の内部での、音が伝わる向きと、ファン２２が発生させた冷却風が流れる向きとは、同じ向きでもよく、逆向きでもよい。 The configuration of the duct structure 40 may be changed as follows. The position of the inlet of the duct structure 40, the position of the outlet, the length, the shape, and the like may be changed. Whether or not the duct structure 40 is shared with other members may be changed. The number of paths from the inlet to the outlet of the duct structure 40 may be one or a plurality, for example, may be branched or merged. The duct structure 40 may have one or more inlets (the same applies to the outlets). The cross-sectional shape of the duct structure 40 may be constant (for example, rectangular) from the inlet to the outlet, or may change in the middle of the path. The duct structure 40 is an exhaust duct in each of the above embodiments, but may be an intake duct (the inlet of the duct structure 40 may be an intake port). More specifically, air (intake air) before being sucked into the fan 22 may flow inside the duct structure 40. The cooling air generated by the fan 22 does not have to flow inside the duct structure 40. The direction in which the sound is transmitted inside the duct structure 40 and the direction in which the cooling air generated by the fan 22 flows may be the same or opposite.
　ダクト構造４０の経路の途中には、漏れ部があってもよい。具体的には例えば、センターダクト６０などのダクトに小開口や隙間があってもよい。また例えば、右側接続ダクト５５は設けられなくてもよい。また例えば、図１１に示す反キャブ側ガード開口２７９が設けられる場合に、左側接続ダクト２７５は設けられなくてもよい。なお、右側接続ダクト５５は、左側接続ダクト２７５よりもキャブ２５に近い。そのため、右側接続ダクト５５が設けられず左側接続ダクト２７５が設けられる場合に比べ、左側接続ダクト２７５が設けられず右側接続ダクト５５が設けられる場合の方が、キャブ２５の騒音を抑制できる。 There may be a leaking part in the middle of the route of the duct structure 40. Specifically, for example, a duct such as the center duct 60 may have a small opening or a gap. Further, for example, the right connection duct 55 may not be provided. Further, for example, when the anti-cab side guard opening 279 shown in FIG. 11 is provided, the left connection duct 275 may not be provided. The right connection duct 55 is closer to the cab 25 than the left connection duct 275. Therefore, compared with the case where the right connection duct 55 is not provided and the left connection duct 275 is provided, the noise of the cab 25 can be suppressed when the left connection duct 275 is not provided and the right connection duct 55 is provided.
　拡張縮小部１６４ｂ（図６参照）の位置や数などが変更されてもよい。例えば、拡張縮小部１６４ｂは、上記実施形態ではセンターセクション１０に設けられたが、反キャブ側ガード３０の内部に設けられてもよい。左側接続ダクト２７５（図１１参照）は、右側接続ダクト１５５－５（図９参照）や右側接続ダクト１５５－６（図１０参照）と同様に、左側側板１３ｂの上側や下側に配置されてもよい。補助通気装置５９５（図２２参照）の位置や数などが変更されてもよい。また、本発明に係る伝播部は、ダクト構造４０のようにダクト構造を備えるものに限定されるものではない。互いに間隔を置いて配置された一対の板状部材の間を音が進行するように、伝播部が形成されてもよい。また、伝播部は、図１において、キャブ近接ガード開口５１および右側側板開口５９のみを備え、右側接続ダクト５５およびセンターダクト６０を備えない態様でもよい。この場合も、キャブ近接ガード２０からセンターセクション１０の内部にエンジン２１が発した音を伝播することができる。また、図１において、右側側板開口５９は、キャブ近接ガード開口５１と左右方向において互いに対向する位置に配置されるものに限定されず、エンジン２１が発した音が両者の間を通過する配置であれば他の形態でもよい。 The position and number of the expansion / reduction unit 164b (see FIG. 6) may be changed. For example, the expansion / contraction part 164b is provided in the center section 10 in the above embodiment, but may be provided in the anti-cab side guard 30. The left connection duct 275 (see FIG. 11) is arranged above and below the left side plate 13b, like the right connection duct 155-5 (see FIG. 9) and the right connection duct 155-6 (see FIG. 10). Also good. The position and number of auxiliary ventilation devices 595 (see FIG. 22) may be changed. Moreover, the propagation part which concerns on this invention is not limited to a thing provided with a duct structure like the duct structure 40. FIG. A propagation part may be formed so that a sound may advance between a pair of plate-like members arranged at intervals. Further, in FIG. 1, the propagation portion may include only the cab proximity guard opening 51 and the right side plate opening 59 and may not include the right connection duct 55 and the center duct 60. Also in this case, the sound emitted by the engine 21 can be propagated from the cab proximity guard 20 into the center section 10. In FIG. 1, the right side plate opening 59 is not limited to the one that is disposed at a position that opposes the cab proximity guard opening 51 in the left-right direction, and the sound emitted by the engine 21 passes between the two. Any other form may be used.

Claims (13)

  1. 　左右方向において互いに対向して配置され、前後方向に沿って延びる複数の側板を有し、前記複数の側板の間に内部空間が形成されているセンターセクションと、
    　前記センターセクションの右側または左側に配置され、内部に騒音源を収容する騒音源収容ガードと、
    　前記騒音源収容ガードの前側または後側に配置されるキャブと、
    　前記騒音源が発生する音を前記騒音源収容ガードの内部から前記センターセクションの前記内部空間に伝播させる伝播部と、
    　を備え、
    　前記伝播部は、
    　　前記騒音源収容ガードに開口された第１放出開口部であって、当該第１放出開口部を通じて前記騒音源収容ガードの内部から前記音が放出されることを許容する第１放出開口部と、
    　　前記センターセクションに開口された第１受入開口部であって、前記第１放出開口部を通じて放出された前記音が前記第１受入開口部を通じて前記内部空間に受け入れられることを許容する第１受入開口部と、
    　を備える、
    　建設機械の上部旋回体。     A center section that is disposed opposite to each other in the left-right direction, has a plurality of side plates extending in the front-rear direction, and an internal space is formed between the plurality of side plates;
    A noise source accommodation guard arranged on the right or left side of the center section and accommodating a noise source therein;
    A cab disposed on the front side or the rear side of the noise source accommodation guard;
    A propagation part for propagating the sound generated by the noise source from the inside of the noise source accommodation guard to the internal space of the center section;
    With
    The propagation part is
    A first emission opening that is opened in the noise source accommodation guard, the first emission opening allowing the sound to be emitted from the inside of the noise source accommodation guard through the first emission opening;
    A first receiving opening that is opened in the center section, the first receiving opening allowing the sound emitted through the first discharging opening to be received in the internal space through the first receiving opening. And
    Comprising
    The upper turning body of construction machinery.
  2. 　請求項１に記載の建設機械の上部旋回体であって、
    　前記伝播部は、前記第１放出開口部および前記第１受入開口部を通じて、前記音が前記騒音源収容ガードから前記センターセクションの前記内部空間に進行するように前記音をガイドするガイド部を備える、建設機械の上部旋回体。     An upper swing body of the construction machine according to claim 1,
    The propagation part includes a guide part that guides the sound through the first discharge opening and the first receiving opening so that the sound travels from the noise source housing guard to the internal space of the center section. , The upper turning body of construction machinery.
  3. 　請求項２に記載の建設機械の上部旋回体であって、
    　前記ガイド部は、前記第１受入開口部から前記センターセクションの前記内部空間に延びるように配置され、前記内部空間への前記音の進行をガイドするセンターセクション内部ガイドを含む、建設機械の上部旋回体。     An upper swing body of the construction machine according to claim 2,
    The guide portion is arranged to extend from the first receiving opening to the internal space of the center section, and includes a center section internal guide that guides the progress of the sound to the internal space. body.
  4. 　請求項２または３に記載の建設機械の上部旋回体であって、
    　前記第１放出開口部および前記第１受入開口部は、左右方向に間隔をおいて互いに対向して配置されている、建設機械の上部旋回体。     An upper swing body of the construction machine according to claim 2 or 3,
    The upper revolving unit of a construction machine, wherein the first discharge opening and the first receiving opening are arranged to face each other with a space in the left-right direction.
  5. 　請求項４に記載の建設機械の上部旋回体であって、
    　前記ガイド部は、前記第１放出開口部と前記第１受入開口部とを接続するように配設され、前記音が前記第１放出開口部から前記第１受入開口部に向かって進行するように前記音をガイドする収容ガード側接続ガイドを更に含む、建設機械の上部旋回体。     An upper swing body of the construction machine according to claim 4,
    The guide portion is disposed to connect the first discharge opening and the first receiving opening, and the sound travels from the first discharge opening toward the first receiving opening. The upper revolving structure of the construction machine further includes an accommodation guard side connection guide for guiding the sound.
  6. 　請求項２～５のいずれか１項に記載の建設機械の上部旋回体であって、
    　前記ガイド部は、前記第１放出開口部から前記騒音源収容ガードの内部に延びるように配置され、前記音が前記第１放出開口部から前記第１受入開口部に向かって進行するように前記音をガイドする収容ガード内部ガイドを含む、建設機械の上部旋回体。     An upper turning body of a construction machine according to any one of claims 2 to 5,
    The guide portion is disposed so as to extend from the first discharge opening to the inside of the noise source housing guard, and the sound proceeds from the first discharge opening toward the first receiving opening. An upper turning body of a construction machine, including an internal guide for a storage guard that guides sound.
  7. 　請求項１～６のいずれか１項に記載の建設機械の上部旋回体であって、
    　前記センターセクションに対して、前記騒音源収容ガードおよび前記キャブが配置される側とは反対側に配置される反キャブ側ガードを更に備え、
    　前記伝播部は、
    　　前記第１受入開口部とは異なる位置で前記センターセクションに開口された第２放出開口部であって、当該第２放出開口部を通じて前記センターセクションの前記内部空間から前記音が放出されることを許容する第２放出開口部と
    　　前記反キャブ側ガードに開口された第２受入開口部であって、前記第２放出開口部を通じて放出された前記音が前記第２受入開口部を通じて前記反キャブ側ガードの内部に受け入れられることを許容する第２受入開口部と、
    を含む、建設機械の上部旋回体。     The upper turning body of the construction machine according to any one of claims 1 to 6,
    The center section further includes an anti-cab side guard disposed on a side opposite to a side on which the noise source accommodation guard and the cab are disposed,
    The propagation part is
    A second discharge opening formed in the center section at a position different from the first receiving opening, wherein the sound is emitted from the internal space of the center section through the second discharge opening. A second receiving opening that is allowed and a second receiving opening that is open to the anti-cab side guard, wherein the sound emitted through the second discharging opening is through the second receiving opening to the anti-cab side A second receiving opening that allows it to be received within the guard;
    Including upper revolving body of construction machinery.
  8. 　請求項７に記載の建設機械の上部旋回体であって、
    　前記第２放出開口部および前記第２受入開口部は、左右方向に間隔をおいて互いに対向して配置されている、建設機械の上部旋回体。     An upper swing body of the construction machine according to claim 7,
    The upper revolving unit of a construction machine, wherein the second discharge opening and the second receiving opening are arranged to face each other with a space in the left-right direction.
  9. 　請求項８に記載の建設機械の上部旋回体であって、
    　前記伝播部は、前記第２放出開口部と前記第２受入開口部とを接続するように配設され、前記音が前記第２放出開口部から前記第２受入開口部に向かって進行するように前記音をガイドする反キャブ側接続ガイドを更に含む、建設機械の上部旋回体。     An upper swing body of the construction machine according to claim 8,
    The propagation part is disposed so as to connect the second discharge opening and the second receiving opening, and the sound travels from the second discharge opening toward the second receiving opening. The upper turning body of the construction machine further includes an anti-cab side connection guide for guiding the sound.
  10. 　請求項７～９のいずれか１項に記載の建設機械の上部旋回体であって、
    　前記伝播部は、前記第２受入開口部から前記反キャブ側ガードの内部に延びるように配置され、前記反キャブ側ガード内への前記音の進行をガイドする反キャブ側ガード内部ガイドを含む、建設機械の上部旋回体。     An upper turning body of a construction machine according to any one of claims 7 to 9,
    The propagation part includes an anti-cab side guard internal guide that is arranged to extend from the second receiving opening to the inside of the anti-cab side guard and guides the progress of the sound into the anti-cab side guard. The upper turning body of construction machinery.
  11. 　請求項１０に記載の建設機械の上部旋回体であって、
    　前記伝播部は、前記第２受入開口部とは異なる位置で前記反キャブ側ガードに開口された第３放出開口部であって、当該第３放出開口部を通じて前記反キャブ側ガード内部ガイドから前記反キャブ側ガードの外部に前記音が放出されることを許容する第３放出開口部を更に有する、建設機械の上部旋回体。     It is the upper revolving structure of the construction machine according to claim 10,
    The propagation part is a third discharge opening that is opened to the anti-cab side guard at a position different from the second receiving opening, and the internal part guides the anti-cab side guard through the third discharge opening. The upper turning body of the construction machine further comprising a third discharge opening that allows the sound to be discharged outside the anti-cab side guard.
  12. 　請求項１～１１のいずれか１項に記載の建設機械の上部旋回体であって、
    　少なくとも前記騒音源収容ガードと前記センターセクションとの間を跨ぐように、前記伝播部に沿って配設される、油圧ホースまたは電線を備える、
    　建設機械の上部旋回体。     An upper turning body of a construction machine according to any one of claims 1 to 11,
    Including a hydraulic hose or an electric wire disposed along the propagation part so as to straddle at least between the noise source accommodation guard and the center section;
    The upper turning body of construction machinery.
  13. 　請求項１～１２のいずれか１項に記載の建設機械の上部旋回体であって、
    　前記第１放出開口部は、前記騒音源と前記キャブとの間において前記騒音源収容ガードに開口されている、
    　建設機械の上部旋回体。     An upper turning body of a construction machine according to any one of claims 1 to 12,
    The first discharge opening is opened in the noise source storage guard between the noise source and the cab.
    The upper turning body of construction machinery.
PCT/JP2016/087334 2016-02-12 2016-12-15 Upper rotating body for construction machine WO2017138249A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5911782Y2 (en) * 1979-02-09 1984-04-10 株式会社加藤製作所 Noise reduction device for work vehicles
JP2003082705A (en) * 2001-09-10 2003-03-19 Hitachi Constr Mach Co Ltd Turning frame of construction machine and its of manufacturing method
JP2010179707A (en) * 2009-02-03 2010-08-19 Kobelco Cranes Co Ltd Working vehicle
JP2013230907A (en) * 2012-04-27 2013-11-14 Kobe Steel Ltd Upper turning body of crane

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4160454B2 (en) * 2003-06-23 2008-10-01 新キャタピラー三菱株式会社 Engine hood for construction machinery, engine room structure for construction machinery, and engine cooling device for construction machinery
JP4539133B2 (en) * 2004-03-01 2010-09-08 コベルコ建機株式会社 Exhaust structure of construction machinery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5911782Y2 (en) * 1979-02-09 1984-04-10 株式会社加藤製作所 Noise reduction device for work vehicles
JP2003082705A (en) * 2001-09-10 2003-03-19 Hitachi Constr Mach Co Ltd Turning frame of construction machine and its of manufacturing method
JP2010179707A (en) * 2009-02-03 2010-08-19 Kobelco Cranes Co Ltd Working vehicle
JP2013230907A (en) * 2012-04-27 2013-11-14 Kobe Steel Ltd Upper turning body of crane

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