CN101356361A - Internal combustion engine with intake muffler - Google Patents
Internal combustion engine with intake muffler Download PDFInfo
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- CN101356361A CN101356361A CNA2007800011625A CN200780001162A CN101356361A CN 101356361 A CN101356361 A CN 101356361A CN A2007800011625 A CNA2007800011625 A CN A2007800011625A CN 200780001162 A CN200780001162 A CN 200780001162A CN 101356361 A CN101356361 A CN 101356361A
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- combustion engine
- expansion chamber
- intake silencer
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Abstract
An intake device for an internal combustion engine has an intake muffler (30) forming an expansion chamber (33) and also has a connection tube (40) having an inflow opening (46) from which air in the expansion chamber (33) flows in and an outflow opening (47) from which air flowing to a combustion chamber flows out. The connection tube (40) is made from an elastic material having rubber elasticity and has a connection section (41) connected to the air intake muffler (30), an inner tube section (42) extending from the connection section (41), in the expansion chamber (33), and in which the inflow opening (46) is formed, and an outer tube section (43) to which a throttle valve device (50) is connected. A communication hole (44) is provided in a tube wall (42w) of the inner tube section (42), and the communication hole (44) causes the expansion chamber (33) and an air path (45) to communicate with each other in order to make the expansion chamber (33) function as a resonance chamber. The outer tube section (43) has a shorter length than the inner tube section (42). Thus, sound muffling by expansion and sound muffling by resonance are combined in the intake muffler.
Description
Technical field
The present invention relates to have the internal-combustion engine of the air inlet system that has been equipped with the intake silencer that forms expansion chamber, this internal-combustion engine for example can be used for machine outside.
Background technique
In the air inlet system of internal-combustion engine, the structure that has the intake silencer that forms expansion chamber in order to reduce induction noise is known (for example, with reference to TOHKEMY 2001-165012 communique and TOHKEMY 2000-145594 communique).And the air inlet system that also has the internal-combustion engine of the intake noise reduction device that is provided with resonant chamber except intake silencer also is known (for example, with reference to patent documentation 1).
Patent documentation 1: Japanese kokai publication hei 2-49963 communique
At the intake silencer that only forms expansion chamber, be in the intumescent silencing apparatus, under the situation of the noise elimination effect of the induction noise that can not fully obtain special frequency band, also use the intake silencer that forms resonant chamber, i.e. resonance type muffler device in the lump.Yet, intumescent silencing apparatus and resonance type muffler device are set respectively make intake silencer maximize.Therefore, for example in miniaturization as machine outside proceeds to equipment near the limit, the miniaturization of the intake noise reduction device configuration difficulty that becomes.
On the other hand, in the internal-combustion engine of machine, the intake silencer that forms expansion chamber is known (for example, with reference to Japanese kokai publication hei 10-184469 communique) with the structure that throttle valve device is connected via flexible nipple overboard.And intake silencer also is known (for example, with reference to described TOHKEMY 2000-145594 communique) with the throttle valve device that is connected with cylinder head via the internal-combustion engine that suction tude connects and suction tude is extended in intake silencer.
In addition, intake silencer is connected by means of the connecting tube that is formed by the elastic material with rubber elasticity with throttle valve device, make the vibration from body of the internal-combustion engine be difficult to be delivered to intake silencer, the generating noise that is caused by the vibration of intake silencer reduces.On the other hand, the suction tude that intake silencer is connected with throttle valve device is extended in intake silencer, thereby by adjusting the length of the suction tude in the intake silencer, the reduction of the increase of the internal-combustion engine output that can realize bringing and the induction noise of special frequency band by the air inlet inertia effect, and can be with the maximization that increases the air inlet system that causes by the interval between intake silencer and the throttle valve device.Yet,, can not use longer pipe as this connecting tube because it is flexible with under intake silencer and the situation that throttle valve device is connected by the connecting tube that is formed by the elastic material with rubber elasticity.
Summary of the invention
The present invention In view of the foregoing finishes, and main purpose of the present invention is to realize intumescent eliminated the noise and the miniaturization of the intake silencer that resonance type muffler combines.Another object of the present invention is to, obtain to can be applicable to reduce the air inlet system of the induction noise of multiple frequency band; The noise elimination effect that raising is brought by resonance type muffler when utilizing expansion chamber; And under the situation of complex-shapedization that does not make intake silencer, improve the noise elimination effect.Another object of the present invention is: reduce the noise that the vibration by intake silencer causes, thereby can realize the miniaturization configuration of intake silencer and throttle valve device, and can realize the increasing combustion engine output that brings by the path-length of adjusting inlet air pathway and reduce induction noise; When making the intake silencer miniaturization, realize the raising of intake efficiency; And, make the reduction effect optimization of induction noise by being set in the bending direction of connecting tube crooked in the intake silencer.
In order to reach above-mentioned main purpose, the invention provides a kind of internal-combustion engine, this internal-combustion engine has air inlet system, and this air inlet system has: intake silencer, it has formed the expansion chamber with the air inlet inlet that flows into for air; And the passage forming body that has formed air flue, this air flue has for the air inflow aperture of the air inflow of described expansion chamber and the air outflow port that flows out for the air of going to the firing chamber, described internal-combustion engine is characterised in that, described passage forming body has in described intake silencer the channel wall that described expansion chamber and described air flue are separated, described channel wall is provided with intercommunicating pore, and this intercommunicating pore is communicated with so that described expansion chamber is carried out function as resonant chamber described expansion chamber and described air flue.
Be typically, described passage forming body is a connecting tube, and this connecting tube has: joint, and it is connected with described intake silencer; And interior pipe portion, it extends in described expansion chamber from described joint, and is provided with described air inflow aperture, described channel wall be described in the tube wall of pipe portion.Preferably, described interior pipe portion has curved tube portion, the direction bending of this curved tube portion central part towards approaching described expansion chamber from described joint.
And described curved tube portion can be with respect to described joint with 90 ° angular bend roughly.
Described passage forming body can constitute, and has the outer tube part of extending outside described expansion chamber from described joint, and this outer tube part is connected with throttle valve device, and this throttle valve device disposes closure and has the main body that has formed intake duct.Then, preferably, described passage forming body is formed by the elastic material with rubber elasticity.And, expectation be that the length of tube of described outer tube part is shorter than the length of tube of pipe portion in described.
Air inflow aperture and described air inlet inlet that described passage forming body preferably, is arranged on the bending direction of the curved tube portion of pipe portion in described side by side.
Can on described joint, the positioning part be set, this positioning part by set described joint at it circumferentially with respect to the position of described intake silencer, set described in pipe portion in the position of bending direction with respect to described intake silencer.
According to the present invention, because by the intercommunicating pore that is arranged on the channel wall that expansion chamber and air flue are separated, can be with expansion chamber as resonant chamber, thereby need not to be provided with respectively expansion chamber and resonant chamber, and improve the noise elimination effect of induction noise by the combination of intumescent noise elimination and resonance type muffler.
Can be with described passage forming body as the connecting tube that has the joint that is connected with described intake silencer and in described expansion chamber, extend and be provided with the interior pipe portion of described air inflow aperture from described joint, and can be with the tube wall of described channel wall as pipe portion in described, and can be with the curved tube portion of pipe portion in described as the direction bending of central part towards approaching described expansion chamber from described joint, like this, the bending in expansion chamber of interior pipe portion, thereby can be when keeping the small-sized property of intake silencer, the length of tube of the interior pipe portion that is configured in the expansion chamber is increased, thereby can make the frequency band variation that makes the induction noise that to obtain the noise elimination effect by the length of tube of pipe portion in adjusting.
And, because pipe portion was crooked and near the central part of expansion chamber in intercommunicating pore was configured to utilize, therefore can be with expansion chamber effectively as resonant chamber, and with intake silencer in the air inlet outlet that is the air flue in the joint in intake silencer, be positioned at which location independent.
Described curved tube portion can be with respect to described joint with 90 ° angular bend roughly, like this, because induction noise is passed to expansion chamber after the curved tube portion that runs into roughly 90 ° of bendings, thereby the warpage number of times of the fluctuation of the air inlet in the intake silencer correspondingly increases owing to curved tube portion, thereby can not make complex-shapedization of intake silencer, just reduce the induction noise of discharging from the air inlet inlet.
As mentioned above, described passage forming body can constitute, has the outer tube part outside described joint extends to described expansion chamber, this outer tube part is connected with throttle valve device, this throttle valve device disposes closure and has the main body that has formed intake duct, and preferably, described passage forming body is formed by the elastic material with rubber elasticity, and expectation is that the length of tube of described outer tube part is shorter than the length of tube of pipe portion in described.
Like this, suppress via throttle valve device from body of the internal-combustion engine to have reduced the vibration of intake silencer by the passage forming body that forms by elastic material to the intake silencer transmitting vibrations with rubber elasticity.And, because the length of tube of outer tube part is shorter than the length of tube of interior pipe portion, thereby intake silencer and throttle valve device closely can be disposed, reduced the space that is formed between intake silencer and the throttle valve device, and the path-length of the interior pipe portion in the intake silencer is increased, and avoided owing to make the path-length of inlet air pathway increase the maximization that causes air inlet system.
Under the situation of air inflow aperture that described passage forming body is arranged on the bending direction of the curved tube portion that constitutes pipe portion in described side by side and described air inlet inlet, because interior pipe portion bending, thereby path-length is increased, and because on bending direction and show air inlet inlet and inflow entrance, thereby the air flows from the inflow entrance to the suction port is fairly simple, has reduced the aeration resistance in the intake silencer.
Can on described joint, the positioning part be set, this positioning part by set described joint at it circumferentially with respect to the position of described intake silencer, set described interior pipe portion in the position of bending direction with respect to described intake silencer, like this, do not need to be used to connect the fastened tools such as anchor clamps of intake silencer and connecting tube, and by utilizing side wall portion, can easily interior pipe portion be set in the optimum position with respect to the bending direction of intake silencer from the viewpoint of induction noise etc.
Description of drawings
Fig. 1 is the summary right side view with machine outside of having used internal-combustion engine of the present invention.
Fig. 2 is the sectional view along the major component of the II-II line of Fig. 1.
Fig. 3 is the right side view of the III alignment of Fig. 2 major component of looking.
Fig. 4 is the sectional view along the major component of the IV-IV line of Fig. 3.
Fig. 5 is the sectional view along the major component of the V-V line of Fig. 3.
Fig. 6 is the sectional view along the major component of the VI-VI line of Fig. 3.
Fig. 7 is the sectional view along the major component of the VII-VII line of Fig. 6.
Fig. 8 is the b-b line sectional view of Fig. 7.
Label declaration
1: install bin; 2: fuel tank; 3: prolong case; 4: gear-box; 5: cover down; 6: engine hood; 7: engine compartment; 8: flywheel; 9: live axle; 10: forward-reverse switching device; 11: cardan shaft; 12: propeller cavitation; 13: speed change lever; 14: running shaft (swivel shaft); 15: rotary box; 16: sloping shaft; 17: carriage; 18: hull; 20: cylinder block; 21: crankcase; 22: cylinder head; 23: valve mechanism cover; 24: piston; 25: connecting rod; 26: bent axle; 27: the firing chamber; 28: driving mechanism; 29: camshaft; 30: intake silencer; 31,32: housing; 33: expansion chamber; 34: the air inlet inlet; 35: the auxiliary section; 36,37: recess; 38: protuberance; 40: connecting tube; 41: joint; 42: interior pipe portion; 43: outer tube part; 44: intercommunicating pore; 45: air flue; 46: inflow entrance; 47: outflow opening; 49: anchor clamps; 50: throttle valve device; 51: throttle body; 52: closure; 53: throttle operation mechanism; 54: engine load sensor; 55: intake duct; 60: intake manifold; S: machine outside; E: internal-combustion engine; K: air inlet system; H1, H2: path; F: flame preventer; L, La, Lb, Lc, Lt: center line.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.
With reference to Fig. 1, used internal-combustion engine of the present invention and be provided on the machine outside S as pusher peculiar to vessel.Machine outside S has: internal-combustion engine E, and it is equipped with the bent axle 26 that has at the rotation centerline of above-below direction orientation; Power transmitting deice, its transmission of power with internal-combustion engine E arrives propeller cavitation 12; Install bin 1, it supports internal-combustion engine E in the upper end portion; Prolong case 3, it is connected with install bin 1 across the fuel tank 2 that engages with the underpart of install bin 1; Gear-box 4, it engages with the underpart that prolongs case 3; Under cover 5, its above-below direction cover comprise from the bottom of internal-combustion engine E install bin 1 and fuel tank 2 to prolong case 3 tops around; And engine hood 6, it engages with following upper end portion of cover 5 and from top covering internal-combustion engine E.
In addition, in the explanation of mode of execution, up and down, all around is that machine outside S is carried about under the state on the hull 18, all around.
Described power transmitting deice has: live axle 9, but it engages with the underpart of bent axle 26 rotatably together with flywheel 8 one; Forward-reverse switching device 10, it is incorporated in the gear-box 4 and has umbrella gear mechanism; And cardan shaft 11, it is equipped with propeller cavitation 12.Live axle 9 arrives in the gear-box 4 from install bin 1 interior the extension downwards in prolonging case 3, and is connected with cardan shaft 11 via forward-reverse switching device 10 in its underpart.The forward-reverse of the hull 18 that is undertaken by forward-reverse switching device 10 switches, and is to be undertaken by the speed change lever 13 that runs through running shaft described later 14 inside is rotated.In addition, the power of internal-combustion engine E is passed to propeller cavitation 12 through bent axle 26, live axle 9, forward-reverse switching device 10 and cardan shaft 11, and propeller cavitation 12 is rotated driving.
The erecting device that is provided on the machine outside S has: running shaft 14, and it is provided with operation unit 14a; Rotary box 15, it is supporting rotating shaft 14 rotationally; And carriage 17, the sloping shaft 16 of rotary box 15 is supported in its maintenance rotationally, and is fixed on the rearward end of hull 18.Running shaft 14 end thereon is fixed on the install bin 1 via rubber 19a is installed, and is fixed on the prolongation case 3 via rubber 19b is installed in its underpart.The machine outside S that utilizes this erecting device to be installed on the hull 18 can be that swing at above-below direction at the center with sloping shaft 16, and can be that swing at left and right directions at the center with running shaft 14.
In the lump with reference to Fig. 2, internal-combustion engine E as 4 cylinders, 4 stroke IC engines in upright arrangement has body of the internal-combustion engine as described below, this body of the internal-combustion engine is made of following: four cylinder block 20 that cylinder 20a is integrally formed, the crankcase 21 that engages with the front end of cylinder block 20, the cylinder head 22 that engages with the rearward end of cylinder block 20, and the valve mechanism cover 23 that engages with the rearward end of cylinder head 22.
But to-and-fro motion ground is connected with bent axle 26 via connecting rod 25 with the piston 24 that each cylinder 20a cooperates.On cylinder head 22, be formed with:, and be opened in suction port and relief opening on the firing chamber 27 with piston 24 opposed firing chambers 27.Carry out the intake valve and the exhaust valve of driven for opening and closing by overhead camshaft type valve actuator with camshaft 29, rotation with bent axle 26 opens and closes described suction port and described relief opening synchronously respectively, and this camshaft 29 is rotated driving by bent axle 26 via driving mechanism 28.
Internal-combustion engine E be disposed at by cover down 5 and engine hood 6 cover and in the engine compartment 7 that forms, on internal-combustion engine E, be equipped with: air inlet system K, it is directed to combustion air in the firing chamber 27; And venting gas appliance, it is provided with path H1, H2 (Fig. 1) that the combustion gas that the burning of the mixed gas in the firing chamber 27 is produced are directed to machine outside S outside.In addition, the suction air that flows in the inlet air pathway in being arranged at air inlet system K, mix and form mixed gas with the fuel that Fuelinjection nozzle provided that forms the unit as mixed gas on being installed in cylinder head 22, this mixed gas is inhaled in the firing chamber 27 by described suction port, is burnt by plug ignition afterwards.Be driven and the piston 24 that moves back and forth by the pressure of the combustion gas that produced, be rotated driving via 25 pairs of bent axles 26 of connecting rod.Then, combustion gas 27 flow out to the exhaust passageway H1 that is arranged in cylinder head 22 and the cylinder block 21 by described relief opening as exhaust from the firing chamber, then by be arranged in the install bin 1, prolong in the case 3, in the gear-box 4 and the exhaust path of navigation H2 in the hub of propeller cavitation 12 be discharged to machine outside S outside.
The air inlet system K that is configured in the engine compartment 7 will be from being arranged on that air on the engine hood 6 is taken into that a part that a mouthful 6a (Fig. 1) flow into the outside air in the engine compartment 7 sucks and as combustion air.As shown in Figure 2, this air inlet system K has: intake silencer 30, and it has formed the expansion chamber 33 as anechoic room that flows into for the air from air inlet inlet 34; As the connecting tube 40 of passage forming body, its formation has the air flue 45 of the inflow entrance 46 that flows into for the air in the expansion chamber 33; A throttle valve device 50, it is connected with intake silencer 30 via connecting tube 40; And intake manifold 60, it is connected with throttle valve device 50 in the end, upstream, and is connected with the cylinder head 22 of the inlet of offering described suction port at downstream end.Intake manifold 60 has: the 60a of set portion, and it is connected with throttle valve device 50; And four branched pipe 60b, it carries out branch and is connected with the described suction port that belongs to each cylinder 20a from the 60a of set portion.
With reference to Fig. 2～Fig. 7 intake silencer 30 is described.As shown in Figure 2, it mouthful is air inlet inlet 34 that intake silencer 30 is provided with in air inlet system K that outside air is taken into, and this intake silencer 30 constitutes by being divided into two-part the 1st housing 31 in the left and right sides and the 2nd housing 32.Then, housing 31,32 is bonded into one at separately peripheral portion 31a, 32a and joint 31b, the 32b (Fig. 4) that are arranged in the hollow columnar of substantial middle portion by heat fusing and constitutes.Constitute the wall of intake silencer 30 respectively, promptly two housings 31,32 of locular wall W1, the W2 (Fig. 6) of expansion chamber 33 are made of plastic thin wall component, and are strengthened by set within it surface and cross one another strengthening rib 31c, 32c (Fig. 4).In addition, among a plurality of assembly department 31e (Fig. 3, Fig. 4, Fig. 7) of intake silencer 30 on being arranged at housing 31, by means of the fastening structure that utilizes bolt and locking strutcture and be installed on the crankcase 21.
With reference to Fig. 6, throttle valve device 50 has: as the throttle body 51 of main body, it is formed with the intake duct 55 from the air ventilation of air flue 45; Closure 52, it is configured in the intake duct 55 and controls air inflow; And throttle operation mechanism 53 (Fig. 2, Fig. 3), it opens and closes closure 52.Closure 52 is made of the butterfly valve, and this butterfly valve has air valve shaft 52a that is supported on rotationally on the throttle body 51 and the air door body 52b that is installed on this air valve shaft 52a.Throttle operation mechanism 53 has: operating stem 53b, and its operation is fixed on the operating arm 53a on the air valve shaft 52a; And Returnning spring 53c, it carries out the application of force to closure 52 towards the valve closing direction.By the operation of the gate footstep lever that undertaken by the driver, via the operating stem 53b that rotates in linkage with this gate footstep lever operating arm 53a is operated, thereby open and close closure 52.The aperture of closure 52 is detected by engine load sensor 54, and the control etc. of the fuel quantity that provides from described Fuelinjection nozzle is provided.
Particularly with reference to Fig. 6, intake silencer 30 has: section 1 30U, and it is provided with air inlet inlet 34; And part 2 30D, it is provided with the auxiliary section 35 that is connected with connecting tube 40, and disposes interior pipe portion 42 described later.In the present embodiment, section 1 30U and part 2 30D are by the flame preventer F that adopts wire gaze to form separately, this flame preventer F is configured in the expansion chamber 33 with air inlet inlet 34, and has the flame function of going out that is used to prevent tempering arrival air inlet inlet 34.
The section 1 30U that is arranged in intake silencer 30 tops and is formed on housing 31 constitutes the protuberance of intake silencer 30, throttle body 51 on the direction identical with the direction outstanding towards intake silencer 30 with intake duct 55 almost parallels give prominence to.Therefore, throttle body 51 is outstanding from intake silencer 30, thereby utilizes the space that forms thereon that section 1 30U is set.Section 1 30U forms the cylindrical space have with the axis of the centre line L t of intake duct 55 or left and right directions almost parallel, and is communicated with part 2 30D by the opening that opens wide in the direction of this axis.And the air inlet inlet 34 that is arranged on section 1 30U bottom is on the footpath of intake duct 55 upwards is opened in flat locular wall part W1a with the centre line L t almost parallel of intake duct 55.The locular wall part W1a that constitutes section 1 30U diapire has the bottom surface W1a1 (with reference to Fig. 3) that is made of the plane of inclination of face forward a little, and radially with throttle body 51 in the face of and with inflow entrance 46 almost parallels.Then, be opened in air inlet inlet 34 on the W1a1 of bottom surface square neck is oblique forward and open wide down.
In addition, in specification and claims, radially be meant centre line L t with the centre line L of air flue 45 and intake duct 55 be the center radially, circumferentially be meant with this centre line L, Lt be the center circumferentially.And in the present embodiment, centre line L b, Lc, Lt are at the left and right directions almost parallel.
In the part 2 30D that forms by two housings 31,32, below all be arranged in the housing 31, that is: the auxiliary section 35 that is connected with connecting tube 40 in the intake silencer 30 as joint, and avoid and as the crankcase 21 that is configured near the circumferential component the intake silencer 30 and the recess 36,37 (Fig. 2, Fig. 5) of the interference between the throttle operation mechanism 53.
Be positioned at intake silencer 30 bottoms and then be positioned at the auxiliary section 35 of the below of section 1 30U, peripheral portion by the locular wall part W1c that limits the matching hole 35a that is formed by circular open constitutes, this matching hole 35a be arranged on the above-below direction almost parallel and with left and right directions roughly on the flat locular wall part W1c (Fig. 5, Fig. 6) of quadrature.Matching hole 35a and auxiliary section 35 have the roughly consistent center line of centre line L b, Lc of the air flue part 45b, the 45c that form with the centre line L t of intake duct 55 and by joint 41 described later and outer tube part 43, and roughly be positioned at centre line L b plane orthogonal on.
With reference to Fig. 3, Fig. 4, Fig. 7, from the direction (hereinafter referred to as " centerline direction ") of center line Lb, Lc, Lt, intake silencer 30 is divided into two parts at fore-and-aft direction, that is: zone 301, it is provided with section 1 30U and auxiliary section 35, and pipe portion 42 in having taken in; And zone 302, it is provided with part outstanding in expansion chamber 33 is recess 36,37, and is formed with the more than half 33a of main chamber of volume that accounts for expansion chamber 33.Then, each recess 36,37 (hereinafter referred to as " configuration direction ", is an above-below direction along the direction that disposes section 1 30U and auxiliary section 35 side by side in the present embodiment roughly.) extend.As can be seen from Figure 2, recess 36 be used to avoid and crankcase 21 between interference, (Fig. 5 illustrates the position of the gate footstep lever when opening wide closure 52 fully to the interference between the throttle arm that recess 37 is used for avoiding and rotating with double dot dash line.)。And, in 302 the part of zone, be provided with and be the outstanding protuberance 38 (Fig. 4, Fig. 7) of eaves shape from recess 36, this protuberance 38 be arranged to section 1 30U in abutting connection with and separate by partition wall W1d (also with reference to Fig. 5) and section 1 30U.Increase owing to this protuberance 38 makes the volume of part 2 30D, improved the noise elimination effect of expansion chamber 33.
And, as shown in Figure 5, the locular wall that forms by recess 36 among the locular wall W1 partly be differential wall W1e from centerline direction see with described configuration direction almost parallel (in the present embodiment, with at fore-and-aft direction plane orthogonal almost parallel), and extend to the substantial middle of inflow entrance 46 and straight pipe portion 42b described later from locular wall part W1c at centerline direction.Then, the part of differential wall W1e constitutes guiding wall W1e1.This guiding wall W1e1 crosses inflow entrance 46 and air inlet inlet 34 and the part of extending in the configuration direction in differential wall W1e.Then, be directed to inflow entrance 46 by the guiding wall W1e1 that is positioned at inflow entrance 46 upstreams from air inlet 34 leaked-in airs that enter the mouth, and be limited to leave and flow to recess 36,37 from inflow entrance 46.
With reference to Fig. 6, the connecting tube 40 of pipe shape uses the elastic material with rubber elasticity, for example synthetic rubber is integrally formed, this connecting tube 40 is configured between intake silencer 30 and the throttle valve device 50 and both is coupled together, and forms the air flue 45 that the air in the expansion chamber 33 is directed to intake duct 55.Connecting tube 40 has: joint 41, and it is inserted in the matching hole 35a and inner and cooperates with auxiliary section 35; Interior pipe portion 42, it extends in expansion chamber 33 from joint 41; And outer tube part 43, it extends outside expansion chamber 33 from joint 41.The downstream end 43a (Fig. 4) of the joint that the conduct in the outer tube part 43 is connected with throttle valve device 50 cooperates with end, the upstream 51a of throttle body 51 inner, the periphery of downstream end 43a is fastened by the anchor clamps 49 (Fig. 5) as setting tool, and connecting tube 40 is connected with throttle body 51.Be provided with along the strengthening rib 40c1 of extending circumferentially with along the strengthening rib 40c2 of centre line L at the outer circumferential face of connecting tube 40.And this downstream end 43a forms the outflow opening 47 of air flue 45, and circulation and the air of going to firing chamber 27 flow out from this outflow opening 47 in intake duct 55 and intake manifold 60.
In addition, the described inlet air pathway of air inlet system K is the path that is formed by connecting tube 40, throttle body 51 and intake manifold 60, and air flue 45 and intake duct 55 constitute the part of this inlet air pathway.
The joint 41 that cooperates with the inboard of auxiliary section 35 has at its outer circumferential face: as collar flange 41a, the 41b of a pair of opposed side walls portion, their form the groove that cooperates with auxiliary section 35 is circular mating groove 41c (Fig. 6); And as a pair of engagement portion 41e (Fig. 7) of positioning part, their set joint 41 circumferentially with respect to the position of intake silencer 30.A pair of circular flange 41a, 41b is configured in the expansion chamber 33 respectively and inner flange 41a and external flange 41b outside the expansion chamber 33.
On external flange 41b, be formed with i.e. two the engagement portion 41e of radially outstanding a pair of teat in the opposed position of its diametric(al) as a flange among two flange 41a, the 41b.On the other hand, in intake silencer 30, be provided with a pair of engagement portion 39 that engages with each engagement portion 41e.Each engagement portion 39 as the positioning part in intake silencer 30 is made of recess, so that cooperate with engagement portion 41e, this recess is by forming towards the outside of locular wall W1, W2 outstanding a pair of teat 39a, 39b.Each engagement portion 39 is open to the direction of insertion that connecting tube 40 inserts in matching hole 35a when connecting tube 40 is connected with intake silencer 30.
Then, by two engagement portion 41e, 39 engagings with correspondence, set joint 41 in circumferential position with respect to intake silencer 30, set connecting tube 40 in the position of bending direction described later, and prevent that connecting tube 40 is in circumferential rotation with respect to intake silencer 30 with respect to intake silencer 30.Therefore, two engagement portion 41e, 39 also are the rotation prevention portions of connecting tube 40.
As shown in Figure 6, in part 2 30D, interior pipe portion 42 with respect to joint 41 towards the direction bending of inflow entrance 46 near air inlet inlet 34.In addition, interior pipe portion 42 is made of following, that is: the 42a of curved tube portion, its from joint 41 with 90 ° angle roughly towards the direction bending of inflow entrance 46 near air inlet inlet 34; And straight pipe portion 42b, its from the upstream extremity of the 42a of curved tube portion in tangent direction and locular wall part W1 almost parallel and linearly extension.The tube wall 42w of interior pipe portion 42 is the channel wall that in intake silencer 30 expansion chamber 33 and air flue 45 separated, this tube wall 42w is provided with intercommunicating pore 44, and this intercommunicating pore 44 is with expansion chamber 33 and air flue 45 is communicated with to get up so that expansion chamber 33 is carried out function as resonant chamber.Inflow entrance 46 is formed by end, the upstream 42b1 of straight pipe portion 42b.
Then, on the bending direction of interior pipe portion 42 and show inflow entrance 46 and air inlet inlet 34 (with reference to Fig. 4), and in the direction of the centre line L a of the air flue part 45a1 of inflow entrance of offering respectively on the plane of almost parallel mutually 46 and the air flue 45 of air inlet inlet 34 in straight pipe portion 42b or flow on the main flow direction of the air in the inflow entrance 46 and be in approaching position.And the air main flow direction of air inlet inlet 34 and inflow entrance 46 is roughly antithesis.Therefore, from the air inlet of intake duct 55 fluctuation in connecting tube 40 the 42a of curved tube portion warpage 1 time, in part 2 30D between inflow entrance 46 and section 1 30U warpage 1 time, in section 1 30U to enter the mouth 34 warpages 1 time of air inlet, thereby from air flue 45 to arrive air inlet inlet 34 during warpage at least three times, thereby reduced the induction noises of discharging from air inlet inlet 34.
Intercommunicating pore 44 opens wide to the 33a of main chamber, and be in compared with the centre line L b of the air flue part 45b of the air flue in the joint 41 45 this centre line L b radially more near the position of air inlet inlet 34, in the present embodiment, be in radially compared with air flue part 45b more near the position of air inlet inlet 34.Therefore, the 42a of curved tube portion towards intercommunicating pore 44 compared with joint 41 more near the direction bending of expansion chamber 33 central parts.In addition, air flue part 45c is owing to be that the air of expansion chamber 33 flows out to the path of intake silencer 30 outsides, thereby also is the air inlet outlet in the intake silencer 30.
Because intercommunicating pore 44 is arranged on the cross part of strengthening rib 40c1, the 40c2 of the formation heavy section in the connecting tube 40 and two strengthening rib 40c1,40c2, thereby no matter whether connecting tube 40 is formed by described elastic material, can both prevent because the reduction in strength of the connecting tube 40 that intercommunicating pore 44 causes is set.So, by this intercommunicating pore 44, in an intake silencer 30, utilize the expansion chamber 33 of double as resonant chamber, bring into play noise elimination effect with intumescent is eliminated the noise and resonance type muffler combines.In the illustrated embodiment, intercommunicating pore 44 is opened in the boundary vicinity of 42a of curved tube portion and straight pipe portion 42b.
And the length of tube of outer tube part 43 or path-length are shorter than the length of tube or the path-length of interior pipe portion 42.Therefore, throttle body 51 can be disposed near intake silencer 30.And the path-length of the air flue part 45a that is formed by interior pipe portion 42 is configured to, and in order to reduce the induction noise of special frequency band, the node of the air inlet fluctuation that produces this induction noise is positioned near inflow entrance 46 or its.Here, length of tube or path-length are the length of described inlet air pathway on center line.
Joint 41 and outer tube part 43 are made of continuous straight pipe portion 42b, thereby have centre line L b, the Lc that is formed by the straight line identical with the centre line L t of intake duct 55, and arranged coaxial.Therefore, be not provided with under the engagement portion 42e of double as rotation prevention portion, 39 the situation, change the bending direction of connecting tube 40 with respect to intake silencer 30 even connecting tube 40 is rotated in the auxiliary section 35 of intake silencer 30, throttle body 51 also remains unchanged with respect to the position of connecting tube 40.Therefore, in this case, connecting tube 40 variable joints 41 are in circumferential position with respect to intake silencer 30, and do not change the position of throttle body 51 with respect to intake silencer 30, thus, also can adjust the position that the position of inflow entrance 46 in expansion chamber 33 is set in bending direction the noise elimination best results.
Then, when intake silencer 30 is connected with connecting tube 40, at first, to have with the straight pipe portion 42b of the roughly the same external diameter of matching hole 35a and under making its state that is deformed into undergauge a little, be inserted in the matching hole 35a, afterwards, interior pipe portion 42 is inserted in the expansion chamber 33 and cooperates up to mating groove 41c and auxiliary section 35.Then, joint 41 cooperates with auxiliary section 35 under the state of resiliently deformable a little, and connection is finished.And, when when intake silencer 30 takes off connecting tube 40, make joint 41 be deformed into that undergauge is removed and auxiliary section 35 between mated condition, from matching hole 35a, extract joint 41 and interior pipe portion 42 afterwards.Like this, joint 41 is connected removably with intake silencer 30 in auxiliary section 35.
The following describes the effect and the effect of the mode of execution of described formation.
In air inlet system K, connecting tube 40 has in intake silencer 30 the tube wall 42w as channel wall that expansion chamber 33 and air flue 45 are separated, tube wall 42w is provided with inflow entrance 46 and intercommunicating pore 44, this intercommunicating pore 44 makes expansion chamber 33 and air flue 45 is communicated with so that expansion chamber 33 is carried out function as resonant chamber, thereby can expansion chamber 33 be used as resonant chamber by intercommunicating pore 44, thereby need not to be provided with respectively expansion chamber and resonant chamber, and improve the noise elimination effect of induction noise by the combination of intumescent noise elimination and resonance type muffler.As a result, can utilize the intake silencer 30 that forms expansion chamber 33 to carry out the noise elimination of resonance type muffler, thereby can obtain to have improved the small-sized intake silencer 30 of the noise elimination effect of induction noise.
In air inlet system K, the connecting tube 40 that intake silencer 30 and throttle body 51 are coupled together is formed by the elastic material with rubber elasticity, this connecting tube 40 has: at the inner joint 41 that cooperates with the auxiliary section 35 of intake silencer 30, and be boundary interior pipe portion 42 of in expansion chamber 33, extending and the outer tube part 43 of outside expansion chamber 33, extending with joint 41, the length of tube of the outer tube part 43 that is connected with throttle body 51 is shorter than the length of tube of interior pipe portion 42, thereby suppress via throttle valve device 50 from described body of the internal-combustion engine to have reduced the vibration of intake silencer 30 to intake silencer 30 transmitting vibrations by the connecting tube 40 that forms by elastic material with rubber elasticity.And, because the length of tube of outer tube part 43 is shorter than the length of tube of interior pipe portion 42, thereby intake silencer 30 and throttle valve device 50 closely can be disposed, reduced the space that is formed between intake silencer 30 and the throttle valve device 50, and the path-length of the interior pipe portion 42 in the intake silencer 30 is increased, and avoided owing to make the path-length of described inlet air pathway increase the maximization of the air inlet system K that causes.The result, reduced the noise that the vibration by intake silencer 30 causes, thereby can realize the miniaturization configuration of intake silencer 30 and throttle valve device 50, and can be in the maximization of avoiding air inlet system K, be applied to the reduction of the induction noise of the increase of the internal-combustion engine output that brings by the path-length of adjusting the interior pipe portion 42 in the intake silencer 30 and multiple frequency band.
The interior pipe portion 42 that connecting tube 40 has the joint 41 that is connected with intake silencer 30 and extends in expansion chamber 33, interior pipe portion 42 have intercommunicating pore 44 towards compared with joint 41 more near the 42a of curved tube portion of the direction bending of the central part of expansion chamber 33, thereby interior pipe portion 42 bending in expansion chamber 33, thereby can be when keeping intake silencer 30 small-sized property, the length of tube of the interior pipe portion 42 that is configured in the expansion chamber 33 is increased, can make the frequency band variation that makes the induction noise that to obtain the noise elimination effect by the length of tube of pipe portion 42 in adjusting.And, because pipe portion 42 was crooked and near the central part of expansion chamber 33 in intercommunicating pore 44 was configured to utilize, thereby can be with expansion chamber 33 effectively as resonant chamber, and with intake silencer 30 in the air inlet outlet that is which location independent of air flue part 45b in intake silencer 30 in the joint 41.Consequently, be configured in the degrees of freedom that the length of tube of the interior pipe portion 42 in the expansion chamber 33 adjusts and increase, can obtain when keeping the small-sized property of intake silencer 30, being applied to the air inlet system K that the induction noise of multiple frequency band reduces.And, 42 bendings of interior pipe portion, thus intercommunicating pore 44 can be configured near the central part of expansion chamber 33, thereby can improve the effect of the resonance type muffler that utilizes expansion chamber 33, improve the noise elimination effect.
The 42a of curved tube portion with respect to joint 41 with 90 ° angular bend roughly, thereby induction noise is passed to expansion chamber 33 after the 42a of curved tube portion that runs into roughly 90 ° of bendings, thereby the warpage number of times of the fluctuation of the air inlets in the intake silencer 30 is because the 42a of curved tube portion and correspondingly increasing, and the induction noises of emitting from air inlet inlet 34 reduce.Consequently, pipe portion 42 increases the warpage number of times of air inlet fluctuation in can utilizing, thereby can not make complex-shapedization of intake silencer 30 and can improve the noise elimination effect.
In air inlet system K, the connecting tube 40 that intake silencer 30 and throttle body 51 are coupled together is formed by the elastic material with rubber elasticity, this connecting tube 40 has: at the inner joint 41 that cooperates with the auxiliary section 35 of intake silencer 30, and be boundary interior pipe portion 42 of in expansion chamber 33, extending and the outer tube part 43 of outside expansion chamber 33, extending with joint 41, the length of tube of the outer tube part 43 that is connected with throttle body 51 is shorter than the length of tube of interior pipe portion 42, thereby suppress via throttle valve device 50 from described body of the internal-combustion engine to have reduced the vibration of intake silencer 30 to intake silencer 30 transmitting vibrations by the connecting tube 40 that forms by elastic material with rubber elasticity.And, because the length of tube of outer tube part 43 is shorter than the length of tube of interior pipe portion 42, thereby intake silencer 30 and throttle valve device 50 closely can be disposed, reduced the space that is formed between intake silencer 30 and the throttle valve device 50, and the path-length of the interior pipe portion 42 in the intake silencer 30 is increased, and avoided owing to make the path-length of described inlet air pathway increase the maximization of the air inlet system K that causes.The result, reduced the noise that the vibration by intake silencer 30 causes, thereby can realize the miniaturization configuration of intake silencer 30 and throttle valve device 50, and can be in the maximization of avoiding air inlet system K, be applied to increasing combustion engine output that brings by the path-length of adjusting the interior pipe portion 42 in the intake silencer 30 and the induction noise that reduces multiple frequency band.
Joint 41 has inner flange 41a and the external flange 41b that forms the mating groove 41c that cooperates with auxiliary section 35 at its outer circumferential face, externally flange 41b is provided with the engagement portion 41e as the positioning part, this engagement portion 41e is by setting joint 41 in circumferential position with respect to intake silencer 30, set joint 41 in the position of bending direction with respect to intake silencer 30, thereby do not need to be used for the fastened tools such as anchor clamps that are connected of intake silencer 30 and connecting tube 40, cut down cost.And, by utilizing the external flange 41b that forms mating groove 41c, can easily interior pipe portion 42 be set in the optimum position with respect to the bending direction of intake silencer 30 from viewpoints such as induction noises, thereby can set the reduction effect optimization that makes induction noise by the bending direction of the connecting tube in intake silencer 30 40.
Utilize throttle body 51 outstanding from intake silencer 30 and space that form is provided with section 1 30U, thereby can utilize this space between intake silencer 30 and the throttle valve device 50 to increase the volume of expansion chamber 33, thereby this point also help to improve the noise elimination effect in the miniaturization configuration of keeping intake silencer 30 and throttle valve device 50.
Because by the recess 36,37 that is arranged at intake silencer 30, intake silencer 30 can be disposed near body of the internal-combustion engine and throttle operation mechanism 53, thereby can realize the miniaturization configuration of intake silencer 30 overboard among the machine S.
The guiding wall W1e1 that forms by means of a part of utilizing the differential wall W1e that is formed by recess 36 will guide into the inflow entrance 46 of pipe portion 42 in the flow direction from enter the mouth 34 air of air inlet, thereby make from air inlet and enter the mouth 34 leaked-in airs, thereby improved intake efficiency by inflow entrance 46 deflections.
Below, the structure after changing of the mode of execution after a part of structure that changes described mode of execution is described.
Throttle valve device can be the Carburetor that forms the unit as the mixed gas with closure.
The positioning part can only have be used to set in the locating function of bending direction of pipe portion 42, and double as rotation prevention portion not, in this case, two positioning parts can constitute at the scale of circumferential position and the combination of mark by expression joint 41, also can carry out the position adjustment of bending direction.
The positioning part can be arranged on the inner flange 41a.
Connecting tube is made of integrally formed parts, yet can constitute by the parts after integrated by a plurality of parts are connected.
Do not adopt at connecting tube under the situation of described elastomer formation, interior at least pipe portion 42 can be integrally formed with intake silencer, and in this case, the part of air flue can be shaped by locular wall.
Can have plural curved tube portion and constitute connecting tube and constitute air silencer, so as before to arrive the air inlet inlet from air flue in air flue warpage more than twice, and before arriving the air inlet inlet in expansion chamber warpage more than three times.
Internal-combustion engine can be provided on the machine outside pusher peculiar to vessel or the machinery (for example vehicle) beyond this pusher peculiar to vessel in addition.
Claims (11)
1. internal-combustion engine, this internal-combustion engine has air inlet system, and this air inlet system has: intake silencer, it has formed the expansion chamber with the air inlet inlet that flows into for air; And the passage forming body that has formed air flue, this air flue has air inflow aperture that flows into for the air of described expansion chamber and the air outflow port that flows out for the air of going to the firing chamber, and described internal-combustion engine is characterised in that,
Described passage forming body has in described intake silencer the channel wall that described expansion chamber and described air flue are separated, described channel wall is provided with intercommunicating pore, and this intercommunicating pore is communicated with so that described expansion chamber is carried out function as resonant chamber described expansion chamber and described air flue.
2. internal-combustion engine according to claim 1 is characterized in that described passage forming body is a connecting tube, and this connecting tube has: joint, and it is connected with described intake silencer; And interior pipe portion, it extends in described expansion chamber from described joint, and is provided with described air inflow aperture, described channel wall be described in the tube wall of pipe portion.
3. internal-combustion engine according to claim 2 is characterized in that, described interior pipe portion has curved tube portion, the direction bending of this curved tube portion central part towards approaching described expansion chamber from described joint.
4. internal-combustion engine according to claim 3 is characterized in that, described curved tube portion with respect to described joint with 90 ° angular bend roughly.
5. internal-combustion engine according to claim 3 is characterized in that, is provided with straight pipe portion continuously in the end away from described joint of described curved tube portion, and described air inflow aperture is arranged on the end of this straight pipe portion.
6. internal-combustion engine according to claim 5 is characterized in that described intercommunicating pore is opened in the boundary vicinity of described curved tube portion and described straight pipe portion.
7. internal-combustion engine according to claim 1 is characterized in that, described expansion chamber forms air flue, and this air flue enters the mouth to the described air inflow aperture bending of described air flue from the described air inlet of intake silencer.
8. internal-combustion engine according to claim 2, it is characterized in that, described passage forming body has the outer tube part outside described joint extends to described expansion chamber, this outer tube part is connected with throttle valve device, this throttle valve device disposes closure and has the main body that has formed intake duct, and described passage forming body is formed by the elastic material with rubber elasticity.
9. internal-combustion engine according to claim 8 is characterized in that, the length of tube of described outer tube part is shorter than the length of tube of pipe portion in described.
10. internal-combustion engine according to claim 3 is characterized in that, the air inflow aperture and the described air inlet inlet of described passage forming body arranged on the bending direction of the curved tube portion of pipe portion in described side by side.
11. internal-combustion engine according to claim 3, it is characterized in that, described joint is provided with the positioning part, this positioning part by set described joint at it circumferentially with respect to the position of described intake silencer, set described in pipe portion in the position of bending direction with respect to described intake silencer.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006099096A JP4671899B2 (en) | 2006-03-31 | 2006-03-31 | Internal combustion engine with intake silencer |
| JP2006099097A JP4675815B2 (en) | 2006-03-31 | 2006-03-31 | Internal combustion engine with intake silencer |
| JP099097/2006 | 2006-03-31 | ||
| JP099096/2006 | 2006-03-31 | ||
| PCT/JP2007/054666 WO2007113987A1 (en) | 2006-03-31 | 2007-03-09 | Internal combustion engine with intake muffler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101356361A true CN101356361A (en) | 2009-01-28 |
| CN101356361B CN101356361B (en) | 2012-04-25 |
Family
ID=38673807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800011625A Expired - Fee Related CN101356361B (en) | 2006-03-31 | 2007-03-09 | Internal combustion engine with intake muffler |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4671899B2 (en) |
| CN (1) | CN101356361B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103703239A (en) * | 2011-07-23 | 2014-04-02 | 本田技研工业株式会社 | Outboard motor |
| CN109306925A (en) * | 2017-07-26 | 2019-02-05 | 泰贺斯聚合物股份有限公司 | Silencing means |
| CN110651114A (en) * | 2017-05-22 | 2020-01-03 | 曼·胡默尔有限公司 | Muffler for reducing gas noise in the intake system of an internal combustion engine and method for producing such a muffler |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108488013A (en) * | 2018-05-11 | 2018-09-04 | 杭叉集团股份有限公司 | A kind of fork truck intake muffler |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE438009B (en) * | 1978-10-03 | 1985-03-25 | Dolmar Maschfab | INSULATION AND / OR EXHAUST SILENCE AT FAST ENGINE COMBUSTION ENGINES |
| JP3528979B2 (en) * | 1994-08-24 | 2004-05-24 | 豊田合成株式会社 | Silencer |
| JP2895407B2 (en) * | 1994-12-01 | 1999-05-24 | 本田技研工業株式会社 | Intake silencer |
| JP3516915B2 (en) * | 2000-10-24 | 2004-04-05 | 富士重工業株式会社 | Engine intake duct structure |
| JP3724642B2 (en) * | 2001-12-27 | 2005-12-07 | 株式会社デンソー | Intake device |
| JP3938564B2 (en) * | 2003-10-16 | 2007-06-27 | 本田技研工業株式会社 | Air cleaner device for internal combustion engine |
-
2006
- 2006-03-31 JP JP2006099096A patent/JP4671899B2/en active Active
-
2007
- 2007-03-09 CN CN2007800011625A patent/CN101356361B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103703239A (en) * | 2011-07-23 | 2014-04-02 | 本田技研工业株式会社 | Outboard motor |
| CN103703239B (en) * | 2011-07-23 | 2016-01-20 | 本田技研工业株式会社 | Machine outside |
| CN110651114A (en) * | 2017-05-22 | 2020-01-03 | 曼·胡默尔有限公司 | Muffler for reducing gas noise in the intake system of an internal combustion engine and method for producing such a muffler |
| CN110651114B (en) * | 2017-05-22 | 2022-09-09 | 曼·胡默尔有限公司 | Muffler for reducing gas noise in the intake system of an internal combustion engine and method for producing such a muffler |
| CN109306925A (en) * | 2017-07-26 | 2019-02-05 | 泰贺斯聚合物股份有限公司 | Silencing means |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007270752A (en) | 2007-10-18 |
| JP4671899B2 (en) | 2011-04-20 |
| CN101356361B (en) | 2012-04-25 |
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