WO2014163078A1 - Cooling engine, engine-operated vehicle - Google Patents

Cooling engine, engine-operated vehicle Download PDF

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Publication number
WO2014163078A1
WO2014163078A1 PCT/JP2014/059639 JP2014059639W WO2014163078A1 WO 2014163078 A1 WO2014163078 A1 WO 2014163078A1 JP 2014059639 W JP2014059639 W JP 2014059639W WO 2014163078 A1 WO2014163078 A1 WO 2014163078A1
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WO
WIPO (PCT)
Prior art keywords
air
muffler
guide plate
cylinder
cooling
Prior art date
Application number
PCT/JP2014/059639
Other languages
French (fr)
Japanese (ja)
Inventor
健文 川口
直人 一橋
Original Assignee
日立工機株式会社
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Filing date
Publication date
Application filed by 日立工機株式会社 filed Critical 日立工機株式会社
Publication of WO2014163078A1 publication Critical patent/WO2014163078A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P1/00—Air cooling
    • F01P1/06—Arrangements for cooling other engine or machine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools

Definitions

  • the present invention relates to a structure of a small air-cooled engine and an engine working machine using the same.
  • FIG. 8 is a perspective view showing a configuration of a brush cutter 300 as an example of this.
  • a brush cutter 300 an engine is built in the brush cutter body 310 at the right end in the figure, and the rotational motion is transmitted to the cutting blade 320 at the left end in the figure, and the cutting blade 320 is rotated to cut plants and the like.
  • the operator can operate the brush cutter 300 and perform cutting work such as hedges by gripping the handle 330. *
  • the engine used here is required to be small and light, it is often air-cooled.
  • a cooling fan is fixed to the drive shaft of the engine, and the cooling fan continuously rotates during operation of the engine to generate cooling air, thereby forcibly cooling the engine (cylinder) and the like. It is said. Further, the exhaust gas from the cylinder is exhausted to the outside through an exhaust port and a muffler. In order to remove harmful substances, a catalyst is provided inside the muffler. *
  • the cylinder and the muffler that are heated are covered with a cover made of a resin material or the like, and the cylinder is accommodated in the cylinder chamber and the muffler is accommodated in the muffler chamber.
  • the cylinder is cooled by cooling air generated by a cooling fan.
  • the temperature of the muffler is lower than the temperature of the cylinder that is the heat generation source.
  • a partition plate for heat insulation between the cylinder and the muffler is also provided between the cylinder chamber and the muffler chamber.
  • cooling air generated by a cooling fan and cooling the cylinder in the cylinder cover can be used for cooling the muffler.
  • ventilation holes cooling air holes
  • the partition plate partition wall
  • the cooling air also cools the muffler.
  • the efficiency of cooling the muffler can be enhanced by a simple structure in which the ventilation holes are provided in the partition plate. Therefore, this configuration is particularly effective for engine working machines that are required to be small and light.
  • a cylinder In a general engine, a cylinder is provided on a crankcase, and a cooling fan is fixed to a drive shaft existing on the crankcase side. For this reason, in order to cool the cylinder, the cooling air flows from the lower side where the crankcase is located toward the upper side where the cylinder is located.
  • a muffler with an expansion chamber and a catalyst inside is large in the vertical direction and is attached to the side of the cylinder, and the catalyst is generally provided below the exhaust port (connection portion between the muffler and the cylinder). There are many. For this reason, when cooling such a large muffler in the vertical direction, it is particularly important to cool the lower side.
  • the present invention has been made in view of such problems, and an object thereof is to provide an invention that solves the above problems.
  • An air-cooled engine of the present invention includes a cylinder, a drive shaft to which a cooling fan is attached and provided below the cylinder, and a muffler attached to an exhaust port of the cylinder, and the cylinder covers a cylinder cover.
  • the muffler is housed in a muffler chamber formed by being covered with a muffler cover, and the cooling air generated by the cooling fan flows through the cylinder chamber.
  • a part of the air-cooled engine is configured to flow into the muffler chamber, and includes an air guide plate that restricts a vertical flow of the cooling air and generates a horizontal flow in the muffler chamber.
  • the surface constituting the air guide plate is formed with an angle with respect to the axial direction of the cylinder.
  • the air guide plate is installed between an upper surface and a bottom surface of the muffler in the vertical direction.
  • the air guide plate is provided on a side closer to the cooling fan than the exhaust port in the horizontal direction.
  • the air guide plate is configured to extend in the horizontal direction in the muffler chamber.
  • a partition plate is provided between the cylinder chamber and the muffler chamber, the cooling air flows through a ventilation port provided in the partition plate, and the air guide plate includes the muffler It is provided adjacent to the vent hole in the chamber.
  • the air-cooled engine of the present invention is characterized in that a plurality of sets of the air vent and the air guide plate are provided apart in the vertical direction.
  • the air guide plate and the ventilation port are provided in a horizontal direction closer to the cooling fan than the exhaust port.
  • the ventilation plate and the ventilation port face the ventilation port.
  • a guide portion is provided for deflecting the flow of the cooling air toward the side farther from the cooling fan in the horizontal direction.
  • the guide portion is configured by an inner surface of the muffler cover.
  • the air guide plate is installed in the muffler.
  • the air guide plate is installed on the muffler cover.
  • the air guide plate is formed of a metal plate member.
  • the surface constituting the air guide plate is formed with an angle with respect to the axial direction of the drive shaft.
  • the engine working machine of the present invention includes the air-cooled engine.
  • both the cylinder and the muffler can be cooled with high efficiency by the cooling air generated by the cooling fan.
  • FIG. 1 is a perspective assembly view showing an overall configuration of an air-cooled engine according to an embodiment of the present invention. It is a fragmentary sectional view perpendicular
  • the air-cooled engine includes a two-cycle engine body including a cylinder, a crankcase, and the like, and a muffler connected to the exhaust port. All of these are covered with a cover, and a high temperature cylinder is provided in the cylinder chamber and a muffler is provided in the muffler chamber.
  • a partition plate is provided between the cylinder chamber and the muffler chamber for heat insulation.
  • a cooling fan is fixed to the drive shaft of the engine body (crankcase), and the cooling air generated by the rotation of the cooling fan cools the cylinder in the cylinder chamber, and at the same time, the ventilation port provided in the partition plate. It is also introduced into the street muffler chamber, and the muffler is cooled (air cooled). At this time, the air-cooled engine is configured to increase the efficiency of cooling the muffler.
  • This engine is used, for example, in a portable working machine carried by an operator, such as a brush cutter, a blower, a chain saw, or a power cutter, or in an engine working machine such as a generator. Mounted on. Therefore, actually, a speed reducer or the like for driving the engine work machine main body is also connected to the drive shaft, and the engine is fixed to the engine work machine main body (for example, the brush cutter main body 310 in FIG. 8). Is also provided in the engine. However, since the connection structure between these engine work machine main bodies is not directly related to the present invention, and these are the same as those conventionally known, the description thereof will be omitted below. The structure and functions mainly related to the cooling of the cylinder and the muffler will be described. *
  • FIG. 1 is a perspective assembly view showing the configuration of the engine (air-cooled engine) 1, and is a view of the engine 1 as viewed obliquely from the rear.
  • an engine body in which a cylinder 12 is provided on a crankcase 11 is covered with a cylinder cover 13.
  • a fuel tank 14 in which fuel is stored is installed below the crankcase 11.
  • a carburetor 15 is connected to an intake port (not shown) provided on the right side (left side in FIG. 1) of the cylinder 12.
  • An air cleaner 16 is connected to the right side of the vaporizer 15 (left side in FIG. 1).
  • the carburetor 15 is supplied with fuel from the fuel tank 14 and air via the air cleaner 16 to form an air-fuel mixture, which is taken into the cylinder 12 from the intake port. *
  • exhaust from the cylinder 12 is performed from a cylinder exhaust port (exhaust port) 17 on the left side (right side in FIG. 1), and a muffler 20 is connected to the cylinder exhaust port 17.
  • the exhaust gas passes through the expansion chamber in the muffler 20 and the catalyst portion on which the catalyst is supported for noise reduction and removal of harmful substances, and then is discharged from the muffler exhaust gas outlet 21 to the outside.
  • the muffler 20 is covered with a muffler cover 22, and a muffler cover exhaust gas outlet 23, which is an opening, is provided at a location corresponding to the muffler exhaust gas outlet 21 in the muffler cover 22.
  • the cylinder 12 is accommodated in the cylinder chamber in the cylinder cover 13, and the muffler 20 is accommodated in the muffler chamber in the muffler cover 22.
  • the cylinder chamber and the muffler chamber in which the cylinder 12 having the highest temperature to become a heat source is accommodated are partitioned by the partition plate 30. Therefore, the muffler 20 is fixed to the cylinder exhaust port 17 (cylinder 12) through the partition plate 30 by the mounting bolt 31.
  • the partition plate 30 is provided with an exhaust opening 32 corresponding to the cylinder exhaust port 17. The partition plate 30 makes it difficult for heat from the cylinder 12 to be transmitted to the muffler 20.
  • a first ventilation port (ventilation port) 33 and a second ventilation port (ventilation port) 34 are also provided for ventilation between the cylinder chamber and the muffler chamber.
  • the first vent hole 33 and the second vent hole 34 are not actually openings, but are notches around the partition plate 30, but after the assembly, Are covered with the muffler cover 22, these actually function as openings.
  • a first air guide plate (wind guide plate) 35 and a second air guide plate (wind guide plate) 36 that are flat in the horizontal direction are provided on the muffler chamber side above the first air vent 33 and the second air vent 34. Each is provided.
  • a drive shaft extending in the front-rear direction is provided in the crankcase 11, and an output is taken out when the drive shaft rotates.
  • a cooling fan is fixed to the front end side of the drive shaft, and cooling air is generated as the drive shaft rotates.
  • the cooling air 10A passing through the first ventilation port 33 and the cooling air 10B passing through the second ventilation port 34 flow through the muffler chamber as shown in FIG. *
  • FIG. 2 is a partial cross-sectional view of the rear side of the engine 1 as viewed from the cross section perpendicular to the drive shaft where the cooling fan is provided.
  • the axis of the cylinder 12 is in the vertical direction
  • the axis of the drive shaft 19 is in the front-rear direction perpendicular thereto.
  • the cooling fan 18 is configured by a plurality of propellers being radially provided in a substantially disk-like structure with the drive shaft 19 as the center, and the drive shaft 19 rotates counterclockwise in FIG.
  • the cooling air 10, 10A, 10B and the like shown in FIG. 2 are generated. Actually, the flow of the cooling air is continuous in any direction, and such division is impossible.
  • the cooling air 10, 10A, and 10B are defined as shown as representative flows. .
  • the cooling air 10 or the like flows in the cylinder chamber 41 in the cylinder cover 13 from the lower side (cooling fan 18 side) to the upper side (cylinder 12 side) in FIG. 2, and the cylinder 12 having a plurality of fins on the surface is provided. Cooled by the cooling air 10.
  • the right cylinder chamber 41 and the left muffler chamber 42 are partitioned by a partition plate 30, and the partition plate 30 is provided with a first ventilation port 33 and a second ventilation port 34.
  • the cooling air 10A, 10B also flows to the muffler chamber 42 side. As shown in FIG. 1, the muffler 20 is located behind (on the other side of the paper) the first air vent 33, the second air vent 34, the first air guide plate 35, and the second air guide plate 36 in FIG. 2. Is provided.
  • the first air guide plate 35 and the second air guide plate 36 restrict the flow of the cooling air 10A and 10B from the vertical direction (the axial direction of the cylinder 12) to the left and right direction (particularly the left direction). For this reason, as shown in FIG. 2, the cooling air 10 ⁇ / b> A and 10 ⁇ / b> B easily flows on the muffler chamber 42 side. Therefore, in FIG. 2, the first air guide plate 35 and the second air guide plate 36 are within the air guide plate installation range 37 that is the range between the muffler upper surface 24 and the muffler bottom surface 25 in the muffler 20 in the vertical direction. It is preferable to provide it.
  • a range where the catalyst portion 26 in which the catalyst is installed in the muffler 20 is indicated by a dotted line in FIG. 2, and this catalyst portion 26 is a portion where the cooling efficiency should be enhanced most in the muffler 20.
  • the first air guide plate 35 and the second air guide plate 36 are provided above the first air vent 33 and the second air vent 34, respectively.
  • FIG. 3 is a view showing the structure of the engine 1 in the vicinity of the cross section in the AA direction in FIG. 2, and shows the flow of the cooling air 10B in the horizontal direction in the muffler chamber 42 at the location including the second ventilation port 34.
  • the cooling air 10 ⁇ / b> B generated by the cooling fan 18 flows through the second ventilation port 34 to the left (downward in FIG. 3) and is introduced into the muffler chamber 42.
  • this flow was in the vertical direction (perpendicular to the cross section shown in FIG. 3). Changes direction to the left. For this reason, the cooling air 10 ⁇ / b> B is actively taken into the muffler chamber 42.
  • the cooling air 10 ⁇ / b> B taken into the muffler chamber 42 here is introduced into the muffler chamber 42 after staying on the high-temperature cylinder 12 side for a short time. For this reason, the temperature of this cooling wind 10B is low, and high cooling efficiency is obtained.
  • the cooling air 10B cools the muffler first side surface 27 and then hits the guide portion 28 that is the inner surface on the front side of the side surface of the muffler cover 22 and changes its direction backward (to the left in FIG. 3). It is discharged together with the exhaust gas 45 from the muffler cover exhaust gas outlet 23 at the rear end of the muffler cover 22 via the left muffler second side surface 29. For this reason, the cooling air 10B is discharged outside after cooling around the muffler 20 in FIG. As shown in FIG. 2, the catalyst portion 26 exists at this position in the vertical direction of the muffler 20. With the above configuration, the catalyst unit 26 can be efficiently cooled by the cooling air 10B. *
  • the first ventilation port 33 is formed above the cross-sectional location shown in FIG. 3, and the inside of the muffler chamber 42 is passed through the first ventilation port 33.
  • the cooling air 10A flows substantially parallel to the cooling air 10B.
  • the cooling air 10A is discharged around the muffler cover exhaust gas outlet 23 in the horizontal direction after cooling around the muffler 20 in the same manner as the cooling air 10B shown in FIG. Thereby, the upper part of the muffler 20 can also be cooled.
  • the cooling air 10 ⁇ / b> A introduced into the muffler chamber 42 is taken into the muffler chamber 42 through the first ventilation port 33 after passing through the cylinder 12 side as shown in FIG. 2. For this reason, although the temperature of the cooling air 10A is higher than that of the cooling air 10B, the upper portion of the muffler 20 including the upper surface side can be cooled by the cooling air 10A.
  • the ventilation openings (the first ventilation opening 33 and the second ventilation opening 34) and the ventilation plates (the first ventilation plate 35 and the second ventilation plate) provided in the partition plate 30. 36)
  • the muffler 20 can be more efficiently cooled by the cooling air generated by the cooling fan 18.
  • the ventilation port and the air guide plate are provided in front of the exhaust port 17 (the side where the cooling fan 18 is provided) as shown in FIG. Obviously, it is preferable. Further, as described above, in order to efficiently cool the muffler 20, it is preferable that the air vent and the air guide plate are provided in the air guide plate installation range 37. However, in order to apply a cooling air having a low temperature like the cooling air 10B to a specific region in the muffler 20 (in the above example, the lower portion where the catalyst unit 26 is provided in the muffler 20), These are preferably provided at specific locations where the muffler chamber 42 can be introduced.
  • the second ventilation port 34 and the second air guide plate 36 are provided below the cylinder 12.
  • the first ventilation port 33 and the first air guide plate 35 are provided at a certain height of the cylinder 12.
  • the first air guide plate 35 and the second air guide plate 36 are flat plates extending in the horizontal direction.
  • the flow in the vertical direction of the cooling air is limited and the flow in the horizontal direction is limited. As long as can be generated, these shapes are arbitrary.
  • the baffle plate extends in the horizontal direction.
  • an angle inclined with respect to the vertical direction (the axial direction of the cylinder 12) (FIG. 1 to FIG.
  • the first air guide plate 35 and the second air guide plate 36 having 90 ° in the example 3 were used.
  • the angle of the surfaces constituting the air guide plate can be set as appropriate. For example, if the air guide plate is inclined in the front-rear direction, for example, the front side of the sheet in the cross section of FIG. 2, the cooling air can be directed toward the muffler 20 on the rear side (the other side of the sheet in FIG. 2).
  • an air guide plate having a surface direction different from these is further added.
  • the added third wind guide plate 38 (not shown in FIGS. 1 and 2) is indicated by a dotted line.
  • the third air guide plate 38 is an air guide plate extending in a direction perpendicular to the paper surface in FIG.
  • the third air guide plate 38 has a flow in the front-rear direction. What is necessary is just to have an angle with respect to the front-back direction (axial direction of the drive shaft 19) so that it may restrict
  • the guide portion 28 that changes the flow of the cooling air 10 ⁇ / b> B from the left to the rear is formed on the inner surface of the muffler cover 22.
  • the guide portion that generates the same flow can be formed of a structure separate from the muffler cover 22.
  • the partition plate is used to shield the muffler from the cylinder.
  • the area, number, and arrangement of the ventilation openings are appropriately set within a range in which the heat shielding effect is effective.
  • the air guide plate need not be formed of the same material as that of the partition plate, and the air guide plate may be formed of a material different from this and joined to the partition plate. For example, if the air guide plate is made of a metal plate-like member, bending and joining to the partition plate are easy.
  • the air guide plate is formed on the partition plate 30 together with the air vent.
  • an air guide plate can be formed in addition to the partition plate on the muffler chamber side.
  • FIG. 4 is a partial cross-sectional view corresponding to FIG. 2 showing the configuration of the first modified example in which the air guide plate is installed on the muffler.
  • no partition plate is used, and a fourth wind guide plate (wind guide plate) 51 is provided on the muffler first side surface 27 which is the side surface of the muffler 50 on the cooling fan 18 side.
  • FIG. 5 is a perspective view of the muffler 50 alone used here.
  • the fourth wind guide plate (wind guide plate) 51 is the same as the muffler 20 shown in FIG. 1 except that it is provided on the muffler first side surface 27.
  • the 4th wind guide plate 51 can be comprised with a metal plate-shaped member similarly to the above.
  • this configuration can be used particularly preferably in order to further suppress the temperature rise of the muffler 50 when the contribution of radiation from the cylinder 12 to the temperature rise of the muffler 50 is smaller than the above configuration.
  • the temperature rise of the muffler 50 can be suppressed with a simple configuration in which the fourth air guide plate 51 is provided on the muffler 50 itself.
  • FIG. 6 is a partial cross-sectional view corresponding to FIGS. 2 and 4 showing the configuration of the second modified example in which the air guide plate is installed on the muffler cover. Also in FIG. 6, the partition plate is not used, and the muffler 20 used is the same as the configuration of FIG. Instead, a fifth air guide plate 61 is formed on the inner surface of the muffler cover 60 used here on the cooling fan 18 side. It is clear that the vicinity of the catalyst portion 26 can be cooled particularly efficiently by installing the fifth air guide plate 61 above the catalyst portion 24 (the same location as the second air guide plate 35 in FIG. 2). It is.
  • FIG. 7 is a perspective view of the single muffler cover 60 used here, as viewed from the inner surface side.
  • the points other than the provision of the fifth wind guide plate (wind guide plate) 61 are the same as those of the muffler cover 22 shown in FIG. At this time, the cooling air 10 ⁇ / b> D can cool the lower portion of the muffler 20 with high efficiency by the fifth air guide plate 61 with particularly high efficiency.
  • This configuration can also be used particularly preferably in order to further suppress the temperature rise of the muffler 20 when the contribution of radiation from the cylinder 12 to the temperature rise of the muffler 20 is small compared to the configuration of FIG.
  • the temperature rise of the muffler 20 can be suppressed only by replacing the muffler cover 22 with the muffler cover 60 provided with the fifth air guide plate 61.
  • the air guide plate has a very simple shape, it can be installed in various components in the muffler chamber, but a plurality of air guide plates can be installed in different components. It is clear that they can be used simultaneously. Further, a partition plate in which a ventilation port is formed without forming a wind guide plate can be used, and at the same time, the wind guide plate can be provided on the muffler or the muffler cover. It is also clear that a wind guide plate having the same angle setting as that of the third wind guide plate 38 can be added to the configuration of FIGS.
  • the engine is characterized by the structure of the engine body, the muffler, and the cover that covers them. For this reason, this engine can be mounted on the engine work machine main body while the configuration on the engine work machine main body side is kept as before. For this reason, the engine having the above-described configuration is effective in all engine working machines in which a small air-cooled engine is used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

According to the present invention, a cylinder and a muffler are both cooled with high efficiency by cold air currents produced by a cooling fan. A muffler chamber and a cylinder chamber, in which a cylinder (12) is accommodated at the highest possible temperature in order to serve as a heat source, are partitioned by a partitioning plate (30). In the front side of the partitioning plate (30), a first ventilation port (ventilation port) (33) and a second ventilation port (ventilation port) (34) are provided for ventilation between the cylinder chamber and the muffler chamber. A flat plate-shaped first air-guiding plate (air-guiding plate) (35) and a second air-guiding plate (air-guiding plate) (36) are provided in the horizontal direction on the muffler chamber side in the top parts of the first ventilation port (33) and the second ventilation port (34), respectively. The flows of cold air currents (10A, 10B) are limited in the left-right direction (particularly the left direction) from the up-down direction by the first air-guiding plate (35) and the second air-guiding plate (36).

Description

空冷エンジン、エンジン作業機Air-cooled engine, engine work machine
本発明は、小型の空冷エンジンの構造、これを用いたエンジン作業機に関する。 The present invention relates to a structure of a small air-cooled engine and an engine working machine using the same.
刈払機、送風機、チェーンソー、パワーカッタ等、作業者が携帯して使用する携帯用作業機や、発電機には、動力源として小型のエンジンが用いられる。図８は、この一例である刈払機３００の構成を示す斜視図である。この刈払機３００においては、図中右端の刈払機本体３１０中にエンジンが内蔵され、その回転運動が図中左端の切断刃３２０に伝達され、回転する切断刃３２０によって草木等の切断が行われる。作業者は、ハンドル３３０を把持することによって、この刈払機３００を操作して生垣等の切断作業を行うことができる。　 A small working engine is used as a power source for portable working machines such as brush cutters, blowers, chainsaws, power cutters, and the like that are carried and used by workers. FIG. 8 is a perspective view showing a configuration of a brush cutter 300 as an example of this. In the brush cutter 300, an engine is built in the brush cutter body 310 at the right end in the figure, and the rotational motion is transmitted to the cutting blade 320 at the left end in the figure, and the cutting blade 320 is rotated to cut plants and the like. . The operator can operate the brush cutter 300 and perform cutting work such as hedges by gripping the handle 330. *
ここで使用されるエンジンは、小型、軽量であることが要求されるため、空冷式とされる場合が多い。この場合には、エンジンの駆動軸に冷却ファンが固定され、エンジンの運転中には絶えず冷却ファンが回転して冷却風が生成され、これによって強制的にエンジン（シリンダ）等が冷却される構成とされる。また、シリンダからの排気ガスは、排気口、マフラを介して外部に排気される。有害物質を除去するために、マフラの内部には触媒が設けられる。　 Since the engine used here is required to be small and light, it is often air-cooled. In this case, a cooling fan is fixed to the drive shaft of the engine, and the cooling fan continuously rotates during operation of the engine to generate cooling air, thereby forcibly cooling the engine (cylinder) and the like. It is said. Further, the exhaust gas from the cylinder is exhausted to the outside through an exhaust port and a muffler. In order to remove harmful substances, a catalyst is provided inside the muffler. *
また、作業者の安全等のために、高温となるシリンダ、マフラは、樹脂材料等で構成されたカバーで覆われ、シリンダはシリンダ室、マフラはマフラ室の中に収容される。シリンダ室内において、シリンダは、冷却ファンで生成された冷却風によって冷却される。ここで、運転時においては、マフラの温度は発熱源となるシリンダの温度よりは低くなるものの、マフラ中の触媒を充分に機能させるためには、マフラが高温となることを抑制することは重要である。このため、シリンダ室とマフラ室との間には、シリンダとマフラの間の遮熱のための仕切り板も設けられる。 In addition, for the safety of the operator, the cylinder and the muffler that are heated are covered with a cover made of a resin material or the like, and the cylinder is accommodated in the cylinder chamber and the muffler is accommodated in the muffler chamber. In the cylinder chamber, the cylinder is cooled by cooling air generated by a cooling fan. Here, during operation, the temperature of the muffler is lower than the temperature of the cylinder that is the heat generation source. However, in order for the catalyst in the muffler to function sufficiently, it is important to suppress the muffler from becoming high temperature. It is. For this reason, a partition plate for heat insulation between the cylinder and the muffler is also provided between the cylinder chamber and the muffler chamber.
一方で、マフラの冷却のために、冷却ファンで生成されシリンダカバー中でシリンダを冷却した冷却風を利用することもできる。このため、特許文献１に記載の構造では、上記の仕切り板（区画壁）に通風口（冷却風孔）を設け、この冷却風がマフラも冷却している。この構成においては、仕切り板に通風口を設けただけの単純な構造によってマフラの冷却効率を高めることができる。このため、この構成は、小型・軽量であることが要求されるエンジン作業機には特に有効である。 On the other hand, for cooling the muffler, cooling air generated by a cooling fan and cooling the cylinder in the cylinder cover can be used. For this reason, in the structure described in Patent Document 1, ventilation holes (cooling air holes) are provided in the partition plate (partition wall), and the cooling air also cools the muffler. In this configuration, the efficiency of cooling the muffler can be enhanced by a simple structure in which the ventilation holes are provided in the partition plate. Therefore, this configuration is particularly effective for engine working machines that are required to be small and light.
特開２００３－１２９８４０号公報JP 2003-129840 A
一般的なエンジンにおいては、クランクケースの上にシリンダが設けられ、クランクケースの側に存在する駆動軸に冷却ファンが固定される。このため、シリンダを冷却するためには、冷却風はクランクケースがある下側から、シリンダがある上側に向かって流れる構成とされる。一方で、内部に膨張室や触媒を具備するマフラは上下方向に大きく、シリンダの側方に取り付けられ、触媒は一般には排気口（マフラとシリンダとの接続部分）よりも下側に設けられる場合が多い。このため、こうした上下方向に大きなマフラを冷却するに際しては、特にその下側を冷却することが重要となる。　 In a general engine, a cylinder is provided on a crankcase, and a cooling fan is fixed to a drive shaft existing on the crankcase side. For this reason, in order to cool the cylinder, the cooling air flows from the lower side where the crankcase is located toward the upper side where the cylinder is located. On the other hand, a muffler with an expansion chamber and a catalyst inside is large in the vertical direction and is attached to the side of the cylinder, and the catalyst is generally provided below the exhaust port (connection portion between the muffler and the cylinder). There are many. For this reason, when cooling such a large muffler in the vertical direction, it is particularly important to cool the lower side. *
しかしながら、前記の通り、シリンダ側において冷却風は下側から上側に向かって流れているため、この冷却風によってマフラを効率的に冷却することは困難であった。　 However, as described above, since the cooling air flows from the lower side toward the upper side on the cylinder side, it is difficult to efficiently cool the muffler with this cooling air. *
すなわち、冷却ファンによって生成された冷却風によってシリンダとマフラとを共に高効率で冷却することは困難であった。　 That is, it has been difficult to cool both the cylinder and the muffler with high efficiency by the cooling air generated by the cooling fan. *
本発明は、かかる問題点に鑑みてなされたものであり、上記の問題点を解決する発明を提供することを目的とする。 The present invention has been made in view of such problems, and an object thereof is to provide an invention that solves the above problems.
本発明は、上記課題を解決すべく、以下に掲げる構成とした。本発明の空冷エンジンは、シリンダと、冷却ファンが取り付けられ前記シリンダの下方に設けられた駆動軸と、前記シリンダにおける排気口に取り付けられたマフラと、を具備し、前記シリンダはシリンダカバーに覆われて形成されたシリンダ室に、前記マフラはマフラカバーに覆われて形成されたマフラ室に、それぞれ収容され、前記冷却ファンによって生成された冷却風が前記シリンダ室を流れると共に、前記冷却風の一部は前記マフラ室に流れる構成とされた空冷エンジンであって、前記マフラ室において、前記冷却風の上下方向の流れを制限し水平方向の流れを生成する導風板を具備することを特徴とする。　本発明の空冷エンジンにおいて、前記導風板を構成する面は、前記シリンダの軸線方向に対して角度を有して形成されたことを特徴とする。本発明の空冷エンジンにおいて、前記導風板は、上下方向において前記マフラの上面と底面の間に設置されたことを特徴とする。本発明の空冷エンジンにおいて、前記導風板は、水平方向において前記排気口よりも前記冷却ファンに近い側に設けられたことを特徴とする。本発明の空冷エンジンにおいて、前記導風板は、前記マフラ室において水平方向に延在する形態とされたことを特徴とする。本発明の空冷エンジンにおいて、前記シリンダ室と前記マフラ室の間には仕切り板が設けられ、前記冷却風は前記仕切り板に設けられた通風口を介して流れ、前記導風板は、前記マフラ室において前記通風口に隣接して設けられたことを特徴とする。本発明の空冷エンジンにおいて、前記通風口及び前記導風板は上下方向に離間して複数組設けられたことを特徴とする。本発明の空冷エンジンにおいて、前記導風板及び前記通風口は、水平方向において前記排気口よりも前記冷却ファンに近い側に設けられ、前記マフラ室において、前記通風口と対向し、前記マフラ室内の前記冷却風の流れを水平方向において前記冷却ファンから遠い側に偏向する案内部が設けられたことを特徴とする。本発明の空冷エンジンにおいて、前記案内部は、前記マフラカバーの内面で構成されたことを特徴とする。本発明の空冷エンジンにおいて、前記マフラに前記導風板が設置されたことを特徴とする。本発明の空冷エンジンにおいて、前記マフラカバーに前記導風板が設置されたことを特徴とする。本発明の空冷エンジンにおいて、前記導風板は金属製の板状部材で形成されたことを特徴とする。本発明の空冷エンジンにおいて、前記導風板を構成する面は、前記駆動軸の軸線方向に対して角度を有して形成されたことを特徴とする。本発明のエンジン作業機は、前記空冷エンジンを具備することを特徴とする。 In order to solve the above problems, the present invention has the following configurations. An air-cooled engine of the present invention includes a cylinder, a drive shaft to which a cooling fan is attached and provided below the cylinder, and a muffler attached to an exhaust port of the cylinder, and the cylinder covers a cylinder cover. The muffler is housed in a muffler chamber formed by being covered with a muffler cover, and the cooling air generated by the cooling fan flows through the cylinder chamber. A part of the air-cooled engine is configured to flow into the muffler chamber, and includes an air guide plate that restricts a vertical flow of the cooling air and generates a horizontal flow in the muffler chamber. And In the air-cooled engine of the present invention, the surface constituting the air guide plate is formed with an angle with respect to the axial direction of the cylinder. In the air-cooled engine of the present invention, the air guide plate is installed between an upper surface and a bottom surface of the muffler in the vertical direction. In the air-cooled engine of the present invention, the air guide plate is provided on a side closer to the cooling fan than the exhaust port in the horizontal direction. In the air-cooled engine of the present invention, the air guide plate is configured to extend in the horizontal direction in the muffler chamber. In the air-cooled engine according to the present invention, a partition plate is provided between the cylinder chamber and the muffler chamber, the cooling air flows through a ventilation port provided in the partition plate, and the air guide plate includes the muffler It is provided adjacent to the vent hole in the chamber. The air-cooled engine of the present invention is characterized in that a plurality of sets of the air vent and the air guide plate are provided apart in the vertical direction. In the air-cooled engine of the present invention, the air guide plate and the ventilation port are provided in a horizontal direction closer to the cooling fan than the exhaust port. In the muffler chamber, the ventilation plate and the ventilation port face the ventilation port. A guide portion is provided for deflecting the flow of the cooling air toward the side farther from the cooling fan in the horizontal direction. In the air-cooled engine of the present invention, the guide portion is configured by an inner surface of the muffler cover. In the air-cooled engine of the present invention, the air guide plate is installed in the muffler. In the air-cooled engine of the present invention, the air guide plate is installed on the muffler cover. In the air-cooled engine of the present invention, the air guide plate is formed of a metal plate member. In the air-cooled engine of the present invention, the surface constituting the air guide plate is formed with an angle with respect to the axial direction of the drive shaft. The engine working machine of the present invention includes the air-cooled engine.
本発明は以上のように構成されているので、冷却ファンによって生成された冷却風によってシリンダとマフラとを共に高効率で冷却することができる。 Since the present invention is configured as described above, both the cylinder and the muffler can be cooled with high efficiency by the cooling air generated by the cooling fan.
本発明の実施の形態となる空冷エンジンの全体の構成を示す斜視組立図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective assembly view showing an overall configuration of an air-cooled engine according to an embodiment of the present invention. 本発明の実施の形態となる空冷エンジンの駆動軸と垂直な部分断面図である。It is a fragmentary sectional view perpendicular | vertical to the drive shaft of the air cooling engine used as embodiment of this invention. 本発明の実施の形態となる空冷エンジンのＡ－Ａ方向の断面近傍の構造を示す図である。It is a figure which shows the structure of the cross section vicinity of the AA direction of the air-cooled engine used as embodiment of this invention. 本発明の実施の形態となる空冷エンジンの第１の変形例の構造を示す図である。It is a figure which shows the structure of the 1st modification of the air-cooled engine used as embodiment of this invention. 本発明の実施の形態となる空冷エンジンの第１の変形例において用いられるマフラの斜視図である。It is a perspective view of the muffler used in the 1st modification of the air-cooled engine used as embodiment of this invention. 本発明の実施の形態となる空冷エンジンの第２の変形例の構造を示す図である。It is a figure which shows the structure of the 2nd modification of the air-cooled engine used as embodiment of this invention. 本発明の実施の形態となる空冷エンジンの第２の変形例において用いられるマフラカバーの斜視図である。It is a perspective view of the muffler cover used in the 2nd modification of the air-cooled engine used as embodiment of this invention. 小型の空冷エンジンが用いられるエンジン作業機の構成の一例を示す斜視図である。It is a perspective view which shows an example of a structure of the engine working machine in which a small air cooling engine is used.
本発明の実施の形態となる空冷エンジン（エンジン）の構成について説明する。ここで、この空冷エンジンとは、シリンダ、クランクケース等からなる２サイクルのエンジン本体と、その排気口に接続されたマフラを具備する。これらの全体はカバーで覆われ、高温となるシリンダはシリンダ室に、マフラはマフラ室に設けられる。シリンダ室とマフラ室の間には遮熱のために仕切り板が設けられる。エンジン本体（クランクケース）における駆動軸には冷却ファンが固定され、この冷却ファンが回転することによって生成された冷却風は、シリンダ室においてシリンダを冷却すると同時に、仕切り板に設けられた通風口を通りマフラ室にも導入され、マフラを冷却（空冷）する。この際、この空冷エンジンにおいては、マフラの冷却効率が高くなる構成とされる。 A configuration of an air-cooled engine (engine) according to an embodiment of the present invention will be described. Here, the air-cooled engine includes a two-cycle engine body including a cylinder, a crankcase, and the like, and a muffler connected to the exhaust port. All of these are covered with a cover, and a high temperature cylinder is provided in the cylinder chamber and a muffler is provided in the muffler chamber. A partition plate is provided between the cylinder chamber and the muffler chamber for heat insulation. A cooling fan is fixed to the drive shaft of the engine body (crankcase), and the cooling air generated by the rotation of the cooling fan cools the cylinder in the cylinder chamber, and at the same time, the ventilation port provided in the partition plate. It is also introduced into the street muffler chamber, and the muffler is cooled (air cooled). At this time, the air-cooled engine is configured to increase the efficiency of cooling the muffler.
このエンジンは、例えば、刈払機、送風機、チェーンソー、パワーカッタ等、作業者が携帯して使用する携帯用作業機や、発電機等のエンジン作業機で使用され、上記の構造はエンジン作業機本体に搭載される。このため、実際には、エンジン作業機本体を駆動するための減速機等も駆動軸に接続され、かつこのエンジンをエンジン作業機本体（例えば図８の刈払機本体３１０）に固定するための構造もエンジンに設けられる。しかしながら、これらのエンジン作業機本体との間の接続構造については本願発明とは直接の関係がなく、かつこれらについては従来から知られるものと同様であるため、以下ではこれらについての説明は省略し、主にシリンダ、マフラの冷却に関わる構造、機能について説明する。　 This engine is used, for example, in a portable working machine carried by an operator, such as a brush cutter, a blower, a chain saw, or a power cutter, or in an engine working machine such as a generator. Mounted on. Therefore, actually, a speed reducer or the like for driving the engine work machine main body is also connected to the drive shaft, and the engine is fixed to the engine work machine main body (for example, the brush cutter main body 310 in FIG. 8). Is also provided in the engine. However, since the connection structure between these engine work machine main bodies is not directly related to the present invention, and these are the same as those conventionally known, the description thereof will be omitted below. The structure and functions mainly related to the cooling of the cylinder and the muffler will be described. *
図１は、このエンジン（空冷エンジン）１の構成を示す斜視組立図であり、このエンジン１を斜め後方から見た図となっている。このエンジン１においては、クランクケース１１の上にシリンダ１２が設けられたエンジン本体が、シリンダカバー１３で覆われている。クランクケース１１の下側には、内部に燃料が溜められた燃料タンク１４が設置される。シリンダ１２の右側（図１における左側）に設けられた吸気口（図示せず）には、気化器１５が接続される。気化器１５の右側（図１における左側）には、エアクリーナ１６が接続される。気化器１５には、燃料タンク１４から燃料が、エアクリーナ１６を介して空気が、それぞれ供給され、これらによって混合気が形成され、吸気口からシリンダ１２に吸気される。　 FIG. 1 is a perspective assembly view showing the configuration of the engine (air-cooled engine) 1, and is a view of the engine 1 as viewed obliquely from the rear. In the engine 1, an engine body in which a cylinder 12 is provided on a crankcase 11 is covered with a cylinder cover 13. A fuel tank 14 in which fuel is stored is installed below the crankcase 11. A carburetor 15 is connected to an intake port (not shown) provided on the right side (left side in FIG. 1) of the cylinder 12. An air cleaner 16 is connected to the right side of the vaporizer 15 (left side in FIG. 1). The carburetor 15 is supplied with fuel from the fuel tank 14 and air via the air cleaner 16 to form an air-fuel mixture, which is taken into the cylinder 12 from the intake port. *
一方、シリンダ１２からの排気は、左側（図１における右側）のシリンダ排気口（排気口）１７から行われ、シリンダ排気口１７には、マフラ２０が接続される。排気ガスは、消音、有害物質除去のためにマフラ２０内の膨張室、触媒が担持された触媒部を経てから、マフラ排気ガス出口２１から外部に放出される。マフラ２０は、マフラカバー２２で覆われており、マフラカバー２２におけるマフラ排気ガス出口２１に対応した箇所には、開口部であるマフラカバー排気ガス出口２３が設けられている。 On the other hand, exhaust from the cylinder 12 is performed from a cylinder exhaust port (exhaust port) 17 on the left side (right side in FIG. 1), and a muffler 20 is connected to the cylinder exhaust port 17. The exhaust gas passes through the expansion chamber in the muffler 20 and the catalyst portion on which the catalyst is supported for noise reduction and removal of harmful substances, and then is discharged from the muffler exhaust gas outlet 21 to the outside. The muffler 20 is covered with a muffler cover 22, and a muffler cover exhaust gas outlet 23, which is an opening, is provided at a location corresponding to the muffler exhaust gas outlet 21 in the muffler cover 22.
この構成によって、シリンダ１２は、シリンダカバー１３内のシリンダ室に、マフラ２０は、マフラカバー２２内のマフラ室の中にそれぞれ収容される。ここで、発熱源となるために最も高温となるシリンダ１２が収容されるシリンダ室とマフラ室とは、仕切り板３０で仕切られる。このため、マフラ２０は、この仕切り板３０を介してシリンダ排気口１７（シリンダ１２）に、取付ボルト３１によって固定される。仕切り板３０には、シリンダ排気口１７に対応した排気開口３２が設けられている。この仕切り板３０によって、シリンダ１２からの熱はマフラ２０に伝わりにくくなっている。ただし、この仕切り板３０の前方側においては、シリンダ室とマフラ室間の通気のために、第１通風口（通風口）３３、第２通風口（通風口）３４も設けられている。なお、図示されるように、第１通風口３３、第２通風口３４は実際には開口ではなく、仕切り板３０における周囲の切り欠き部となっているが、組立後には仕切り板３０の周囲はマフラカバー２２で覆われるため、実際にはこれらは開口として機能する。第１通風口３３、第２通風口３４の上部におけるマフラ室側には、水平方向において平板状の第１導風板（導風板）３５、第２導風板（導風板）３６がそれぞれ設けられている。　 With this configuration, the cylinder 12 is accommodated in the cylinder chamber in the cylinder cover 13, and the muffler 20 is accommodated in the muffler chamber in the muffler cover 22. Here, the cylinder chamber and the muffler chamber in which the cylinder 12 having the highest temperature to become a heat source is accommodated are partitioned by the partition plate 30. Therefore, the muffler 20 is fixed to the cylinder exhaust port 17 (cylinder 12) through the partition plate 30 by the mounting bolt 31. The partition plate 30 is provided with an exhaust opening 32 corresponding to the cylinder exhaust port 17. The partition plate 30 makes it difficult for heat from the cylinder 12 to be transmitted to the muffler 20. However, on the front side of the partition plate 30, a first ventilation port (ventilation port) 33 and a second ventilation port (ventilation port) 34 are also provided for ventilation between the cylinder chamber and the muffler chamber. As shown in the figure, the first vent hole 33 and the second vent hole 34 are not actually openings, but are notches around the partition plate 30, but after the assembly, Are covered with the muffler cover 22, these actually function as openings. A first air guide plate (wind guide plate) 35 and a second air guide plate (wind guide plate) 36 that are flat in the horizontal direction are provided on the muffler chamber side above the first air vent 33 and the second air vent 34. Each is provided. *
このエンジン１においては、前後方向に延伸する駆動軸がクランクケース１１内に設けられており、この駆動軸が回転することによって、出力が取り出される。この駆動軸の前端側には冷却ファンが固定され、駆動軸の回転に伴って冷却風が生成される。このうち、第１通風口３３を通る冷却風１０Ａ、第２通風口３４を通る冷却風１０Ｂは、それぞれ図１に示されるようにマフラ室を流れる。　 In the engine 1, a drive shaft extending in the front-rear direction is provided in the crankcase 11, and an output is taken out when the drive shaft rotates. A cooling fan is fixed to the front end side of the drive shaft, and cooling air is generated as the drive shaft rotates. Among these, the cooling air 10A passing through the first ventilation port 33 and the cooling air 10B passing through the second ventilation port 34 flow through the muffler chamber as shown in FIG. *
図２は、このエンジン１における冷却ファンが設けられた箇所の駆動軸と垂直な断面から後方側を見た部分断面図である。シリンダ１２の軸線は上下方向となるのに対して、駆動軸１９の軸線はこれと垂直な前後方向となる。ここで、冷却ファン１８は、駆動軸１９を中心とした略円板状の構造に複数のプロペラが放射状に設けられて構成されており、図２において駆動軸１９が反時計回りに回転することによって、図２中に示される冷却風１０、１０Ａ、１０Ｂ等が生成される。実際には冷却風の流れはどの方向においても連続的でありこうした区分は不可能であるが、ここでは、代表的な流れとして冷却風１０、１０Ａ、１０Ｂを図示されるように定義している。冷却風１０等は、シリンダカバー１３内のシリンダ室４１中を図２中で下側（冷却ファン１８側）から上側（シリンダ１２側）に流れ、表面に複数のフィンが設けられたシリンダ１２が冷却風１０によって冷却される。右側のシリンダ室４１と左側のマフラ室４２は仕切り板３０によって仕切られているが、仕切り板３０には、第１通風口３３、第２通風口３４が設けられているため、これらを介して冷却風１０Ａ、１０Ｂはマフラ室４２側にも流れる。図１に示されるように、マフラ２０は、図２において、第１通風口３３、第２通風口３４、第１導風板３５、第２導風板３６よりも後方（紙面向こう側）に設けられている。 FIG. 2 is a partial cross-sectional view of the rear side of the engine 1 as viewed from the cross section perpendicular to the drive shaft where the cooling fan is provided. The axis of the cylinder 12 is in the vertical direction, whereas the axis of the drive shaft 19 is in the front-rear direction perpendicular thereto. Here, the cooling fan 18 is configured by a plurality of propellers being radially provided in a substantially disk-like structure with the drive shaft 19 as the center, and the drive shaft 19 rotates counterclockwise in FIG. As a result, the cooling air 10, 10A, 10B and the like shown in FIG. 2 are generated. Actually, the flow of the cooling air is continuous in any direction, and such division is impossible. However, here, the cooling air 10, 10A, and 10B are defined as shown as representative flows. . The cooling air 10 or the like flows in the cylinder chamber 41 in the cylinder cover 13 from the lower side (cooling fan 18 side) to the upper side (cylinder 12 side) in FIG. 2, and the cylinder 12 having a plurality of fins on the surface is provided. Cooled by the cooling air 10. The right cylinder chamber 41 and the left muffler chamber 42 are partitioned by a partition plate 30, and the partition plate 30 is provided with a first ventilation port 33 and a second ventilation port 34. The cooling air 10A, 10B also flows to the muffler chamber 42 side. As shown in FIG. 1, the muffler 20 is located behind (on the other side of the paper) the first air vent 33, the second air vent 34, the first air guide plate 35, and the second air guide plate 36 in FIG. 2. Is provided.
この際、第１導風板３５、第２導風板３６により、冷却風１０Ａ、１０Ｂの流れは、上下方向（シリンダ１２の軸線方向）から左右方向（特に左方向）に制限される。このため、図２に示されるように、マフラ室４２側において冷却風１０Ａ、１０Ｂが流れやすくなる。このため、図２において、第１導風板３５、第２導風板３６は、上下方向において、マフラ２０におけるマフラ上面２４とマフラ底面２５の間の範囲である導風板設置範囲３７内に設けることが好ましい。また、マフラ２０内において触媒が設置された触媒部２６が存在する範囲が図２中点線で示されており、この触媒部２６が、マフラ２０中で最も冷却効率を高めるべき箇所である。このため、各通風口の周囲において、通風口側から見て触媒部２６から遠い側に導風板を設置することが好ましい。このため、第１導風板３５、第２導風板３６は、それぞれ第１通風口３３、第２通風口３４の上側に設けられている。　 At this time, the first air guide plate 35 and the second air guide plate 36 restrict the flow of the cooling air 10A and 10B from the vertical direction (the axial direction of the cylinder 12) to the left and right direction (particularly the left direction). For this reason, as shown in FIG. 2, the cooling air 10 </ b> A and 10 </ b> B easily flows on the muffler chamber 42 side. Therefore, in FIG. 2, the first air guide plate 35 and the second air guide plate 36 are within the air guide plate installation range 37 that is the range between the muffler upper surface 24 and the muffler bottom surface 25 in the muffler 20 in the vertical direction. It is preferable to provide it. Further, a range where the catalyst portion 26 in which the catalyst is installed in the muffler 20 is indicated by a dotted line in FIG. 2, and this catalyst portion 26 is a portion where the cooling efficiency should be enhanced most in the muffler 20. For this reason, it is preferable to install a baffle plate on the side far from the catalyst part 26 when viewed from the side of the ventilation port around each ventilation port. For this reason, the first air guide plate 35 and the second air guide plate 36 are provided above the first air vent 33 and the second air vent 34, respectively. *
また、図３は、このエンジン１の図２におけるＡ－Ａ方向の断面近傍の構造を示す図であり、第２通風口３４を含む箇所におけるマフラ室４２における水平方向の冷却風１０Ｂの流れを示す。冷却ファン１８によって生成された冷却風１０Ｂは、第２通風口３４を通り左方（図３における下方）に流れてマフラ室４２に導入される。この際、シリンダ室４１（冷却ファン１８）側では、前記の通り、この流れは上下方向（図３で示された断面と垂直方向）であったが、第２導風板３６によって、この流れは左方向に向きを変える。このため、冷却風１０Ｂが積極的にマフラ室４２に取り込まれる。図２の構成から明らかなように、ここでマフラ室４２に取り込まれる冷却風１０Ｂは、高温となるシリンダ１２側には短時間だけ滞在したのちにマフラ室４２内に導入される。このため、この冷却風１０Ｂの温度は低く、高い冷却効率が得られる。　 FIG. 3 is a view showing the structure of the engine 1 in the vicinity of the cross section in the AA direction in FIG. 2, and shows the flow of the cooling air 10B in the horizontal direction in the muffler chamber 42 at the location including the second ventilation port 34. Show. The cooling air 10 </ b> B generated by the cooling fan 18 flows through the second ventilation port 34 to the left (downward in FIG. 3) and is introduced into the muffler chamber 42. At this time, on the cylinder chamber 41 (cooling fan 18) side, as described above, this flow was in the vertical direction (perpendicular to the cross section shown in FIG. 3). Changes direction to the left. For this reason, the cooling air 10 </ b> B is actively taken into the muffler chamber 42. As is clear from the configuration of FIG. 2, the cooling air 10 </ b> B taken into the muffler chamber 42 here is introduced into the muffler chamber 42 after staying on the high-temperature cylinder 12 side for a short time. For this reason, the temperature of this cooling wind 10B is low, and high cooling efficiency is obtained. *
その後、この冷却風１０Ｂは、マフラ第１側面２７を冷却してからマフラカバー２２の側面の前側の内面である案内部２８に当たり、後方（図３における左方）に向きを変え、マフラ２０の左側のマフラ第２側面２９を経由して、マフラカバー２２の後端部にあるマフラカバー排気ガス出口２３から排気ガス４５と共に放出される。このため、冷却風１０Ｂは、図３におけるマフラ２０の周囲を回って冷却した後に、外部に放出される。図２に示されるように、マフラ２０の上下方向におけるこの箇所には、触媒部２６が存在する。上記の構成により、冷却風１０Ｂによって触媒部２６を効率的に冷却することができる。　 Thereafter, the cooling air 10B cools the muffler first side surface 27 and then hits the guide portion 28 that is the inner surface on the front side of the side surface of the muffler cover 22 and changes its direction backward (to the left in FIG. 3). It is discharged together with the exhaust gas 45 from the muffler cover exhaust gas outlet 23 at the rear end of the muffler cover 22 via the left muffler second side surface 29. For this reason, the cooling air 10B is discharged outside after cooling around the muffler 20 in FIG. As shown in FIG. 2, the catalyst portion 26 exists at this position in the vertical direction of the muffler 20. With the above configuration, the catalyst unit 26 can be efficiently cooled by the cooling air 10B. *
また、図２に示されるように、第１通風口３３は、図３で示された断面の箇所よりも上側に形成されており、この第１通風口３３を介して、マフラ室４２内を前記の冷却風１０Ｂとほぼ平行に冷却風１０Ａが流れる。この冷却風１０Ａは、水平方向においては図３に示された冷却風１０Ｂと同様にマフラ２０の周囲を回って冷却した後に、マフラカバー排気ガス出口２３から放出される。これによって、マフラ２０の上部も冷却することができる。この場合にマフラ室４２に導入される冷却風１０Ａは、図２に示されるように、シリンダ１２側を経由してから第１通風口３３を介してマフラ室４２に取り込まれる。このため、前記の冷却風１０Ｂと比べて冷却風１０Ａの温度は高くなるものの、冷却風１０Ａによって上面側を含むマフラ２０の上部を冷却することができる。 Further, as shown in FIG. 2, the first ventilation port 33 is formed above the cross-sectional location shown in FIG. 3, and the inside of the muffler chamber 42 is passed through the first ventilation port 33. The cooling air 10A flows substantially parallel to the cooling air 10B. The cooling air 10A is discharged around the muffler cover exhaust gas outlet 23 in the horizontal direction after cooling around the muffler 20 in the same manner as the cooling air 10B shown in FIG. Thereby, the upper part of the muffler 20 can also be cooled. In this case, the cooling air 10 </ b> A introduced into the muffler chamber 42 is taken into the muffler chamber 42 through the first ventilation port 33 after passing through the cylinder 12 side as shown in FIG. 2. For this reason, although the temperature of the cooling air 10A is higher than that of the cooling air 10B, the upper portion of the muffler 20 including the upper surface side can be cooled by the cooling air 10A.
このように、上記のエンジン１においては、仕切り板３０に設けられた通風口（第１通風口３３、第２通風口３４）、導風板（第１導風板３５、第２導風板３６）によって、冷却ファン１８によって生成された冷却風でマフラ２０をより効率的に冷却することができる。　 As described above, in the engine 1 described above, the ventilation openings (the first ventilation opening 33 and the second ventilation opening 34) and the ventilation plates (the first ventilation plate 35 and the second ventilation plate) provided in the partition plate 30. 36), the muffler 20 can be more efficiently cooled by the cooling air generated by the cooling fan 18. *
この際、上記のような冷却風の流れを生ずるためには、通風口、導風板は、図１に示されるように排気口１７よりも前側（冷却ファン１８が設けられた側）に設けることが好ましいことは明らかである。また、前記の通り、マフラ２０の冷却を効率的に行うためには、通風口、導風板は、導風板設置範囲３７内に設けることが好ましい。ただし、前記の冷却風１０Ｂのように温度が低い冷却風をマフラ２０における特定の領域（上記の例においてはマフラ２０において触媒部２６が設けられた下部）に当てるためには、こうした冷却風がマフラ室４２に導入できる特定の箇所に、これらを設けることが好ましい。このため、上記の例ではシリンダ１２よりも下方に第２通風口３４、第２導風板３６を設けている。この場合には、マフラにおける他の箇所（上記の例においては例えばマフラ２０の上部）を冷却するために、これらと離れた箇所に別の通風口、導風板を設けることが好ましい。このため、上記の例ではシリンダ１２のある高さに第１通風口３３、第１導風板３５を設けている。このように、仕切り板において、上下方向における異なる箇所に通風口、導風板を複数組設けることが好ましい。　 At this time, in order to generate the flow of the cooling air as described above, the ventilation port and the air guide plate are provided in front of the exhaust port 17 (the side where the cooling fan 18 is provided) as shown in FIG. Obviously, it is preferable. Further, as described above, in order to efficiently cool the muffler 20, it is preferable that the air vent and the air guide plate are provided in the air guide plate installation range 37. However, in order to apply a cooling air having a low temperature like the cooling air 10B to a specific region in the muffler 20 (in the above example, the lower portion where the catalyst unit 26 is provided in the muffler 20), These are preferably provided at specific locations where the muffler chamber 42 can be introduced. For this reason, in the above example, the second ventilation port 34 and the second air guide plate 36 are provided below the cylinder 12. In this case, in order to cool other parts in the muffler (in the above example, for example, the upper part of the muffler 20), it is preferable to provide another ventilation port and a baffle plate at a place away from them. For this reason, in the above example, the first ventilation port 33 and the first air guide plate 35 are provided at a certain height of the cylinder 12. Thus, in the partition plate, it is preferable to provide a plurality of sets of ventilation openings and wind guide plates at different locations in the vertical direction. *
また、上記の例では、第１導風板３５、第２導風板３６の形状は水平方向に広がる平板状であるとしたが、冷却風の上下方向の流れを制限し、水平方向の流れを生成できる限りにおいて、これらの形状は任意である。ただし、マフラ室において、導風板が水平方向に延在する形態とすることが、特に好ましい。　 In the above example, the first air guide plate 35 and the second air guide plate 36 are flat plates extending in the horizontal direction. However, the flow in the vertical direction of the cooling air is limited and the flow in the horizontal direction is limited. As long as can be generated, these shapes are arbitrary. However, in the muffler chamber, it is particularly preferable that the baffle plate extends in the horizontal direction. *
また、上記の例では、元々は上下方向であった冷却風の流れに対して左右方向の流れを生成するために、上下方向（シリンダ１２の軸線方向）に対して傾斜した角度（図１～３の例では９０°）をもつ第１導風板３５、第２導風板３６が用いられた。しかしながら、上記の効果が得られる限りにおいて、導風板を構成する面の角度は適宜設定することが可能である。例えば、導風板を前後方向、例えば図２の断面において紙面手前側に傾斜させれば、その後方（図２における紙面向こう側）にあるマフラ２０側に冷却風を向けることもできる。また、前後方向だけでなく、左右方向（図２における左右方向）に傾斜させても、冷却風において水平方向に流れる成分を生成できる限りにおいて、上記の効果を奏することは明らかである。例えば、この面は水平方向から４５°以下の傾斜角をもっていれば、こうした効果を奏することは明らかである。　 In the above example, in order to generate a flow in the left-right direction with respect to the flow of the cooling air that was originally in the vertical direction, an angle inclined with respect to the vertical direction (the axial direction of the cylinder 12) (FIG. 1 to FIG. The first air guide plate 35 and the second air guide plate 36 having 90 ° in the example 3 were used. However, as long as the above effect can be obtained, the angle of the surfaces constituting the air guide plate can be set as appropriate. For example, if the air guide plate is inclined in the front-rear direction, for example, the front side of the sheet in the cross section of FIG. 2, the cooling air can be directed toward the muffler 20 on the rear side (the other side of the sheet in FIG. 2). Further, it is obvious that the above-described effects can be obtained as long as a component that flows in the horizontal direction can be generated in the cooling air even if the inclination is inclined in the left-right direction (left-right direction in FIG. 2) in addition to the front-rear direction. For example, if this surface has an inclination angle of 45 ° or less from the horizontal direction, it is clear that such an effect is obtained. *
また、図３における水平方向の冷却風の流れを最適化するために、第１導風板３５、第２導風板３６に加えて、面の方向がこれらと異なる導風板を更に追加することもできる。図３においては、追加された第３導風板３８（図１、２において図示省略）が点線で示されている。第３導風板３８は、図３においては紙面と垂直方向に延伸する導風板である。マフラ２０において冷却する必要性の低い部分に近接して第３導風板３８を設けることで、冷却風がマフラ２０におけるこの部分と第３導風板３８の間を流れにくくした状態で、マフラ２０における冷却する必要性の高い部分を冷却するように、冷却風をマフラ２０に沿って流すことができる。 Further, in order to optimize the flow of the cooling air in the horizontal direction in FIG. 3, in addition to the first air guide plate 35 and the second air guide plate 36, an air guide plate having a surface direction different from these is further added. You can also In FIG. 3, the added third wind guide plate 38 (not shown in FIGS. 1 and 2) is indicated by a dotted line. The third air guide plate 38 is an air guide plate extending in a direction perpendicular to the paper surface in FIG. By providing the third air guide plate 38 in the vicinity of the portion of the muffler 20 where cooling is less necessary, the muffler 20 is in a state in which it is difficult for the cooling air to flow between this portion of the muffler 20 and the third air guide plate 38. Cooling air can be flowed along the muffler 20 so as to cool a portion of the 20 that needs to be cooled.
第１導風板３５、第２導風板３６が、上下方向（シリンダ１２の軸線方向）に対して傾斜した角度をもつのに対して、第３導風板３８は、前後方向の流れを制限するように、前後方向（駆動軸１９の軸線方向）に対して角度を有していればよい。この角度は図３における第３導風板３８においては９０°となっているが、前後方向における冷却風の流れを制限するように、この角度も適宜設定することができる。　 While the first air guide plate 35 and the second air guide plate 36 have an angle inclined with respect to the vertical direction (the axial direction of the cylinder 12), the third air guide plate 38 has a flow in the front-rear direction. What is necessary is just to have an angle with respect to the front-back direction (axial direction of the drive shaft 19) so that it may restrict | limit. This angle is 90 ° in the third air guide plate 38 in FIG. 3, but this angle can also be set as appropriate so as to limit the flow of the cooling air in the front-rear direction. *
また、上記の例では、冷却風１０Ｂの流れを左方から後方に変える案内部２８は、マフラカバー２２の内面で形成された。しかしながら、導風板と同様に、同様の流れを生成する案内部を、マフラカバー２２とは別体の構造物で形成することも可能である。　 In the above example, the guide portion 28 that changes the flow of the cooling air 10 </ b> B from the left to the rear is formed on the inner surface of the muffler cover 22. However, similarly to the air guide plate, the guide portion that generates the same flow can be formed of a structure separate from the muffler cover 22. *
また、前記の通り、仕切り板はシリンダからのマフラの遮熱のために用いられる。通風口の面積や数、配置は、この遮熱の効果が有効である範囲において、適宜設定される。導風板は仕切り板と同じ材質で形成される必要はなく、これと異なる材質で導風板を形成し、これを仕切り板に接合してもよい。例えば、導風板を金属製の板状部材で構成すれば、曲げ加工や仕切り板への接合も容易である。 Further, as described above, the partition plate is used to shield the muffler from the cylinder. The area, number, and arrangement of the ventilation openings are appropriately set within a range in which the heat shielding effect is effective. The air guide plate need not be formed of the same material as that of the partition plate, and the air guide plate may be formed of a material different from this and joined to the partition plate. For example, if the air guide plate is made of a metal plate-like member, bending and joining to the partition plate are easy.
上記の構成においては、導風板を通風口と共に仕切り板３０に形成していた。しかしながら、マフラ室側において仕切り板以外に導風板を形成することもできる。 In the above configuration, the air guide plate is formed on the partition plate 30 together with the air vent. However, an air guide plate can be formed in addition to the partition plate on the muffler chamber side.
図４は、導風板をマフラに設置した第１の変形例の構成を示す、図２に対応した部分断面図である。図４においては、仕切り板は使用されておらず、マフラ５０の冷却ファン１８側の側面であるマフラ第１側面２７に第４導風板（導風板）５１が設けられる。第４導風板５１を触媒部２６よりも上側（図２における第２導風板３６と同様の箇所）に設置することによって、特に触媒部２６近傍を高効率で冷却することができることは明らかである。図５は、ここで用いられるマフラ５０単体の斜視図である。第４導風板（導風板）５１がマフラ第１側面２７に設けられた以外の点については、図１に示されたマフラ２０と同様である。 FIG. 4 is a partial cross-sectional view corresponding to FIG. 2 showing the configuration of the first modified example in which the air guide plate is installed on the muffler. In FIG. 4, no partition plate is used, and a fourth wind guide plate (wind guide plate) 51 is provided on the muffler first side surface 27 which is the side surface of the muffler 50 on the cooling fan 18 side. It is clear that the vicinity of the catalyst portion 26 can be cooled particularly efficiently by installing the fourth air guide plate 51 above the catalyst portion 26 (the same location as the second air guide plate 36 in FIG. 2). It is. FIG. 5 is a perspective view of the muffler 50 alone used here. The fourth wind guide plate (wind guide plate) 51 is the same as the muffler 20 shown in FIG. 1 except that it is provided on the muffler first side surface 27.
この構成においては、仕切り板が用いられないためにシリンダ１２とマフラ５０との間の遮熱はされないものの、冷却風がシリンダ室４１とマフラ室４２の間で遮られることはない。この際、冷却風１０Ｃは、第４導風板５１によって特に高効率でマフラ５０の下部を高効率で冷却することができる。第４導風板５１を、前記と同様に金属製の板状部材で構成することができる。 In this configuration, since no partition plate is used, heat is not shielded between the cylinder 12 and the muffler 50, but cooling air is not blocked between the cylinder chamber 41 and the muffler chamber 42. At this time, the cooling air 10 </ b> C can cool the lower part of the muffler 50 with high efficiency by the fourth air guide plate 51 with high efficiency. The 4th wind guide plate 51 can be comprised with a metal plate-shaped member similarly to the above.
このため、この構成は、前記の構成と比べて、マフラ５０の温度上昇に対するシリンダ１２からの輻射の寄与が小さい場合において、マフラ５０の温度上昇をより抑制するために、特に好ましく用いることができる。この場合には、マフラ５０自身に第４導風板５１を設けただけの単純な構成で、マフラ５０の温度上昇を抑制することができる。　 For this reason, this configuration can be used particularly preferably in order to further suppress the temperature rise of the muffler 50 when the contribution of radiation from the cylinder 12 to the temperature rise of the muffler 50 is smaller than the above configuration. . In this case, the temperature rise of the muffler 50 can be suppressed with a simple configuration in which the fourth air guide plate 51 is provided on the muffler 50 itself. *
図６は、導風板をマフラカバーに設置した第２の変形例の構成を示す、図２、４に対応した部分断面図である。図６においても、仕切り板は使用されておらず、使用されるマフラ２０は図２の構成と同様である。その代わりに、ここで用いられるマフラカバー６０の冷却ファン１８側の内側面において、第５導風板６１が形成されている。第５導風板６１を触媒部２４よりも上側（図２における第２導風板３５と同様の箇所）に設置することによって、特に触媒部２６近傍を高効率で冷却することができることは明らかである。図７は、ここで用いられるマフラカバー６０単体を内面側から見た斜視図である。第５導風板（導風板）６１が設けられた以外の点については、図１に示されたマフラカバー２２と同様である。この際、冷却風１０Ｄは、第５導風板６１によって特に高効率でマフラ２０の下部を高効率で冷却することができる。　 FIG. 6 is a partial cross-sectional view corresponding to FIGS. 2 and 4 showing the configuration of the second modified example in which the air guide plate is installed on the muffler cover. Also in FIG. 6, the partition plate is not used, and the muffler 20 used is the same as the configuration of FIG. Instead, a fifth air guide plate 61 is formed on the inner surface of the muffler cover 60 used here on the cooling fan 18 side. It is clear that the vicinity of the catalyst portion 26 can be cooled particularly efficiently by installing the fifth air guide plate 61 above the catalyst portion 24 (the same location as the second air guide plate 35 in FIG. 2). It is. FIG. 7 is a perspective view of the single muffler cover 60 used here, as viewed from the inner surface side. The points other than the provision of the fifth wind guide plate (wind guide plate) 61 are the same as those of the muffler cover 22 shown in FIG. At this time, the cooling air 10 </ b> D can cool the lower portion of the muffler 20 with high efficiency by the fifth air guide plate 61 with particularly high efficiency. *
この構成も、図２等の構成と比べて、マフラ２０の温度上昇に対するシリンダ１２からの輻射の寄与が小さい場合において、マフラ２０の温度上昇をより抑制するために、特に好ましく用いることができる。この場合には、マフラカバー２２を第５導風板６１が設けられたマフラカバー６０に代えるだけで、マフラ２０の温度上昇を抑制することができる。　 This configuration can also be used particularly preferably in order to further suppress the temperature rise of the muffler 20 when the contribution of radiation from the cylinder 12 to the temperature rise of the muffler 20 is small compared to the configuration of FIG. In this case, the temperature rise of the muffler 20 can be suppressed only by replacing the muffler cover 22 with the muffler cover 60 provided with the fifth air guide plate 61. *
なお、図４、６の構成において、仕切り板を用いた場合でも同様の効果を奏することは明らかである。また、上記の通り、導風板は極めて単純な形状をしているため、これをマフラ室の中の様々な構成要素に設置することができるが、複数の導風板を異なる構成要素に設置して同時に用いることができることは明らかである。また、導風板が形成されずに通風口が形成された仕切り板を用いると同時に、導風板をマフラやマフラカバーに設けることもできる。また、前記の第３導風板３８と同様の角度設定をもつ導風板を図４、６の構成に追加することができることも明らかである。 In the configurations of FIGS. 4 and 6, it is obvious that the same effect can be obtained even when a partition plate is used. In addition, as described above, since the air guide plate has a very simple shape, it can be installed in various components in the muffler chamber, but a plurality of air guide plates can be installed in different components. It is clear that they can be used simultaneously. Further, a partition plate in which a ventilation port is formed without forming a wind guide plate can be used, and at the same time, the wind guide plate can be provided on the muffler or the muffler cover. It is also clear that a wind guide plate having the same angle setting as that of the third wind guide plate 38 can be added to the configuration of FIGS.
上記のエンジンにおいては、エンジン本体、マフラとこれらを覆うカバー内の構造に特徴がある。このため、エンジン作業機本体側の構成は従来通りとしたままでこのエンジンをエンジン作業機本体に搭載することができる。このため、小型の空冷エンジンが用いられる全てのエンジン作業機において、上記の構成のエンジンは有効である。 The engine is characterized by the structure of the engine body, the muffler, and the cover that covers them. For this reason, this engine can be mounted on the engine work machine main body while the configuration on the engine work machine main body side is kept as before. For this reason, the engine having the above-described configuration is effective in all engine working machines in which a small air-cooled engine is used.
１　エンジン
１０、１０Ａ、１０Ｂ、１０Ｃ、１０Ｄ　冷却風
１１　クランクケース
１２　シリンダ１３　シリンダカバー
１４　燃料タンク
１５　気化器
１６　エアクリーナ
１７　排気口
１８　冷却ファン
１９　駆動軸
２０、５０　マフラ
２１　マフラ排気ガス出口
２２、６０　マフラカバー
２３　マフラカバー排気ガス出口
２４　マフラ上面
２５　マフラ底面
２６　触媒部
２７　マフラ第１側面
２８　案内部
２９　マフラ第２側面
３０　仕切り板
３１　取付ボルト
３２　排気開口
３３　第１通風口（通風口）
３４　第２通風口（通風口）
３５　第１導風板（導風板）
３６　第２導風板（導風板）
３７　導風板設置範囲
３８　第３導風板（導風板）
４１　シリンダ室
４２　マフラ室
４５　排気ガス
５１　第４導風板（導風板）
６１　第５導風板（導風板）
３００　刈払機（エンジン作業機）
３１０　刈払機本体
３２０　切断刃
３３０　ハンドル 1 Engine 10, 10A, 10B, 10C, 10D Cooling air 11 Crankcase 12 Cylinder 13 Cylinder cover 14 Fuel tank 15 Vaporizer 16 Air cleaner 17 Exhaust port 18 Cooling fan 19 Drive shaft 20, 50 Muffler 21 Muffler exhaust gas outlet 22, 60 Muffler cover 23 Muffler cover exhaust gas outlet 24 Muffler upper surface 25 Muffler bottom surface 26 Catalyst portion 27 Muffler first side surface 28 Guide portion 29 Muffler second side surface 30 Partition plate 31 Mounting bolt 32 Exhaust opening 33 First ventilation port (ventilation port)
34 Second vent (vent)
35 First wind guide plate (wind guide plate)
36 Second wind guide plate (wind guide plate)
37 Wind guide plate installation range 38 Third wind guide plate (wind guide plate)
41 Cylinder chamber 42 Muffler chamber 45 Exhaust gas 51 Fourth wind guide plate (wind guide plate)
61 Fifth wind guide plate (wind guide plate)
300 Brush cutter (engine working machine)
310 Brush cutter body 320 Cutting blade 330 Handle

Claims (14)

  1. シリンダと、冷却ファンが取り付けられ前記シリンダの下方に設けられた駆動軸と、前記シリンダにおける排気口に取り付けられたマフラと、を具備し、前記シリンダはシリンダカバーに覆われて形成されたシリンダ室に、前記マフラはマフラカバーに覆われて形成されたマフラ室に、それぞれ収容され、前記冷却ファンによって生成された冷却風が前記シリンダ室を流れると共に、前記冷却風の一部は前記マフラ室に流れる構成とされた空冷エンジンであって、前記マフラ室において、前記冷却風の上下方向の流れを制限し水平方向の流れを生成する導風板を具備することを特徴とする空冷エンジン。 A cylinder chamber formed by a cylinder, a drive shaft to which a cooling fan is attached and provided below the cylinder, and a muffler attached to an exhaust port of the cylinder, the cylinder being covered with a cylinder cover The muffler is housed in a muffler chamber formed by a muffler cover, and cooling air generated by the cooling fan flows through the cylinder chamber, and a part of the cooling air flows into the muffler chamber. An air-cooled engine configured to flow, comprising an air guide plate that restricts a vertical flow of the cooling air and generates a horizontal flow in the muffler chamber.
  2. 前記導風板を構成する面は、前記シリンダの軸線方向に対して角度を有して形成されたことを特徴とする請求項１に記載の空冷エンジン。 The air-cooled engine according to claim 1, wherein the surface constituting the air guide plate is formed with an angle with respect to the axial direction of the cylinder.
  3. 前記導風板は、上下方向において前記マフラの上面と底面の間に設置されたことを特徴とする請求項１又は２に記載の空冷エンジン。 The air cooling engine according to claim 1 or 2, wherein the air guide plate is installed between an upper surface and a bottom surface of the muffler in a vertical direction.
  4. 前記導風板は、水平方向において前記排気口よりも前記冷却ファンに近い側に設けられたことを特徴とする請求項１から請求項３までのいずれか１項に記載の空冷エンジン。 The air cooling engine according to any one of claims 1 to 3, wherein the air guide plate is provided on a side closer to the cooling fan than the exhaust port in the horizontal direction.
  5. 前記導風板は、前記マフラ室において水平方向に延在する形態とされたことを特徴とする請求項１から請求項４までのいずれか１項に記載の空冷エンジン。 The air cooling engine according to any one of claims 1 to 4, wherein the air guide plate is configured to extend in a horizontal direction in the muffler chamber.
  6. 前記シリンダ室と前記マフラ室の間には仕切り板が設けられ、前記冷却風は前記仕切り板に設けられた通風口を介して流れ、前記導風板は、前記マフラ室において前記通風口に隣接して設けられたことを特徴とする請求項１から請求項５までのいずれか１項に記載の空冷エンジン。 A partition plate is provided between the cylinder chamber and the muffler chamber, the cooling air flows through a ventilation port provided in the partition plate, and the air guide plate is adjacent to the ventilation port in the muffler chamber. The air-cooled engine according to any one of claims 1 to 5, wherein the air-cooled engine is provided.
  7. 前記通風口及び前記導風板は上下方向に離間して複数組設けられたことを特徴とする請求項６に記載の空冷エンジン。 The air cooling engine according to claim 6, wherein a plurality of sets of the ventilation openings and the air guide plates are provided apart from each other in the vertical direction.
  8. 前記導風板及び前記通風口は、水平方向において前記排気口よりも前記冷却ファンに近い側に設けられ、前記マフラ室において、前記通風口と対向し、前記マフラ室内の前記冷却風の流れを水平方向において前記冷却ファンから遠い側に偏向する案内部が設けられたことを特徴とする請求項６又は７に記載の空冷エンジン。 The air guide plate and the ventilation port are provided in a horizontal direction closer to the cooling fan than the exhaust port, and in the muffler chamber, face the ventilation port, and flow the cooling air in the muffler chamber. The air-cooled engine according to claim 6 or 7, further comprising a guide portion that deflects in a horizontal direction to a side far from the cooling fan.
  9. 前記案内部は、前記マフラカバーの内面で構成されたことを特徴とする請求項８に記載の空冷エンジン。 The air-cooled engine according to claim 8, wherein the guide portion is configured by an inner surface of the muffler cover.
  10. 前記マフラに前記導風板が設置されたことを特徴とする請求項１から請求項９までのいずれか１項に記載の空冷エンジン。 The air cooling engine according to any one of claims 1 to 9, wherein the baffle plate is installed in the muffler.
  11. 前記マフラカバーに前記導風板が設置されたことを特徴とする請求項１から請求項１０までのいずれか１項に記載の空冷エンジン。 The air cooling engine according to any one of claims 1 to 10, wherein the air guide plate is installed on the muffler cover.
  12. 前記導風板は金属製の板状部材で形成されたことを特徴とする請求項１から請求項１１までのいずれか１項に記載の空冷エンジン。 The air cooling engine according to any one of claims 1 to 11, wherein the air guide plate is formed of a metal plate member.
  13. 前記導風板を構成する面は、前記駆動軸の軸線方向に対して角度を有して形成されたことを特徴とする請求項１から請求項１２までのいずれか１項に記載の空冷エンジン。 The air-cooled engine according to any one of claims 1 to 12, wherein a surface constituting the air guide plate is formed with an angle with respect to an axial direction of the drive shaft. .
  14. 請求項１から請求項１３までのいずれか１項に記載の空冷エンジンを具備することを特徴とするエンジン作業機。 An engine working machine comprising the air-cooled engine according to any one of claims 1 to 13.
PCT/JP2014/059639 2013-04-03 2014-04-01 Cooling engine, engine-operated vehicle WO2014163078A1 (en)

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JP2013-077465 2013-04-03

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JPH0195526U (en) * 1987-12-15 1989-06-23
JPH0561424U (en) * 1992-01-28 1993-08-13 ヤンマーディーゼル株式会社 Cooling structure for generator with engine
JPH108991A (en) * 1996-06-28 1998-01-13 Yanmar Diesel Engine Co Ltd Soundproof engine working machine

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JPS58197418A (en) * 1982-05-12 1983-11-17 Fuji Heavy Ind Ltd Engine-driven generator
JPS6078928U (en) * 1983-11-04 1985-06-01 富士重工業株式会社 Forced air cooled engine cooling system
JPH0195526U (en) * 1987-12-15 1989-06-23
JPH0561424U (en) * 1992-01-28 1993-08-13 ヤンマーディーゼル株式会社 Cooling structure for generator with engine
JPH108991A (en) * 1996-06-28 1998-01-13 Yanmar Diesel Engine Co Ltd Soundproof engine working machine

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Publication number Priority date Publication date Assignee Title
EP3489481A1 (en) * 2017-11-23 2019-05-29 Andreas Stihl AG & Co. KG Manually operated work device
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