JP3923588B2 - Engine room cooling structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration that maintains a good heat balance of an engine mounted on a vehicle, particularly an engine room of a passenger work vehicle.
[0002]
[Prior art]
Conventionally, for example, a pair of left and right main frames that extend a vehicle body frame of a passenger work vehicle in the front-rear direction, a subframe formed in a substantially U shape in plan view that is spanned between a front end portion and a rear end portion of the main frame, etc. As shown in FIG. 9, the engine housed in the body frame is mounted on an engine mounting base 52 and is covered by a sound insulation cover. The front of the engine is covered, the left and right sides of the engine are covered by the left and right sound insulation covers, the rear of the engine is covered by the rear sound insulation cover 59, and these covers are covered by the hood 45 from above to form the engine room 60. The noise caused by engine vibrations has been reduced. Further, the muffler 11 that exhausts the exhaust gas of the engine 9 is directly fixed to the side of the engine and is housed in the engine room 60 integrally with the engine 9.
[0003]
[Problems to be solved by the invention]
However, in the means as described above, by reducing the opening ratio of the engine room 60, the sound insulation is increased and the propagation of noise can be suppressed. However, waste heat from the engine 9 stays in the engine room 60, Since the engine may overheat, there is a limit to reducing the aperture ratio, and the aperture ratio is as high as 40% at the present time. Further, in the configuration in which the muffler 11 which is a heat source for exhaust gas exhaust is housed in the engine room 60, heat is more retained in the engine room 60, and the engine 9 is easily overheated. Further, in the configuration in which the muffler 11 is directly fixed to the engine 9, the vibration of the engine 9 is transmitted to the muffler 11, and the muffler 11 is vibrated, so that a solid propagation sound is generated from the surface of the muffler 11 and the noise is increased. It was.
[0004]
[Means for Solving the Problems]
The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. In other words, the engine is housed in a main frame disposed at the lower part of a vehicle body frame constituted by hollow pipes on the outer periphery of the fuselage and a sub frame forming an outer frame, and is covered by an engine room in which the outer peripheral surface of the engine is formed of a sound insulating material. In the passenger work vehicle to be mounted, the lower surface of the engine mounting table on which the engine is mounted is supported on the upper portion of the rear support that is installed horizontally at the rear of the main frame, and a muffler is disposed between the lower surface of the engine room and the main frame. is doing.
Further, in the configuration in which the muffler is disposed in the lower part of the engine room, a cooling air inlet duct is fixed to a fan cover that covers the engine side part, the cooling air inlet duct projects forward from the side of the engine room, and the engine room An exhaust duct connected to the muffler cover that covers the muffler is housed inside, and an exhaust port is opened on the rear surface of the engine room to constitute a cooling duct type engine room.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.
1 is a right side view of a passenger work vehicle formed by a pipe-shaped body frame, FIG. 2 is a side sectional view of a passenger work vehicle that houses an engine room in the body frame, FIG. 3 is a plan sectional view, and FIG. FIG. 5 is a partial perspective view of an engine room in which the engine is mounted, and FIG. 6 is a left side view of a passenger work vehicle that projects the cooling air inlet duct from the engine room. 7 is a plan sectional view of a cooling duct type engine room, FIG. 8 is a side sectional view of the engine room, FIG. 9 is a side sectional view showing an internal configuration of a conventional engine room, and FIG. 10 is an engine on which the engine is mounted. It is a side view which shows the support structure of a mounting base.
[0006]
First, a schematic configuration of a passenger work vehicle having an engine room cooling structure according to the present invention will be described with reference to FIGS. A pair of left and right front wheels 3, 3 is attached to the front part of the body frame 1 of the passenger work vehicle A via a front axle case, and a pair of left and right rear wheels 5, 5 are attached to the rear part via a rear axle case. ing. Further, the vehicle body frame 1 is provided with a driving unit 7, an engine 9, a muffler 11, and the like. A lifting mechanism 12 is attached to the rear end of the vehicle body frame 1, and various working machines such as a tillage working machine are attached to the lifting mechanism 12. It is configured as possible.
[0007]
The vehicle body frame 1 includes a pair of left and right main frames 20, 20 extending in the front-rear direction, and a sub-shape formed in a substantially U shape in plan view that is laid between the front end portion and the rear end portion of the main frame 20, 20. The frame 21 and a guard 22 that is erected at the rear part of the sub frame 21 so as to be tiltable and formed in a frontal portal type, and the like.
[0008]
The sub-frame 21 includes a front frame forming pipe 24 that extends horizontally in the left and right directions of the front ends of the main frames 20 and 20, and a left and right frame forming pipe 25 that protrudes rearward from the left and right ends of the front frame forming pipe 24. It consists of 25. The left and right side frame forming pipes 25, 25 are respectively disposed immediately above the front and rear wheels 3, 3, 5 and 5, and strut surface forming portions 25a, 25a which are inclined from the front end toward the rear lower side. The side inclined portions 25b and 25b that are inclined rearward and upward from the rear ends of the strut surface forming portions 25a and 25a to the side position of the seat 36 of the driving unit 7 to be described later, and the side inclined portions 25b The rear extending portions 25c and 25c extend substantially horizontally from 25b to a position above the rear ends of the main frames 20 and 20.
[0009]
Between the left and right strut surface forming portions 25a and 25a, a strut surface portion 71 inclined from the front end to the rear lower side on the same plane as the strut surface forming portions 25a and 25a is stretched. It is configured so that the handle can be operated in a safe and easy posture with the foot placed on the footrest surface portion 71, and when traveling on a downward slope road surface, the operator can step on the footrest surface portion 71. I am doing so.
[0010]
Further, the operating section 7 has a handle column 31 standing at the front end of the main frame 20, 20 in a direction substantially perpendicular to the strut formation portions 25 a, 25 a of the subframe 21, and a handle 32 at the upper end of the handle column 31. The seat 36 is disposed behind the handle 32. Further, the guard 22 formed in a front view portal shape is erected via a bracket 27 on the rear extension portions 25c and 25c of the subframe 21 at the rear position of the seat 36, and the guard 22 is mounted on the bracket 27. It is comprised so that rotation to back is possible centering on.
[0011]
The main frames 20 and 20, the sub frame 21, the guard 22, and the connecting frame 66, which are the constituent members of the vehicle body frame 1, are configured to be lightweight and highly rigid using hollow round or square pipes, respectively. Yes. Further, the rear portions of the main frames 20 and 20 are extended upright directly upward, and the upper end portion is connected to the middle portion of the connecting frame 66, so that a highly rigid frame structure is formed.
[0012]
Next, the engine 9 arranged in the body frame 1 will be described. The engine 9 is mounted on an engine installation base 52 formed in a substantially L shape in a side view and disposed on the rear part of the main frames 20 and 20 behind the seat 36. A front upper end of the engine mounting base 52 is fixed to a front support 41 that connects the front ends of the rear extension portions 25c and 25c of the subframe 21. An air cleaner 51 is disposed on the right side of the rear end of the engine 9, removes dust and the like in the sucked air, and sucks air into the engine 9.
[0013]
As shown in FIGS. 4 and 6, a cooling fan (not shown) is disposed on the right side of the engine 9 in the direction of paper travel, and the fan is covered by a fan cover 85. A cooling air inlet duct 86 is formed on the right side surface of the fan cover 85, and a front portion of the cooling air inlet duct 86 extends forward from the engine installation base 52, and muddy water that the tire lifts directly enters the fan cover 85. It is prevented. The cooling air inlet duct 86 is divided into a front part and a rear part, and is divided into a rear duct 86a fixed to the fan cover 85 and a front duct 86b fixed to the vehicle body frame 1, and the front surface of the rear duct 86a and the front duct 86b. A rubber seal 87 is sandwiched between the abutment surface and the rear surface to absorb the relative displacement between the fan cover 85 of the engine 9 and the vehicle body frame 1 due to the vibration of the airframe, and simultaneously absorb the vibration of the engine 9 and transmit it to the vehicle body frame 1. I don't want to do that.
[0014]
Further, as shown in FIGS. 2 and 10, the engine installation base 52 on which the engine 9 is mounted is mounted on the side-view portal type rear support body 40 that connects the rear portions of the left and right main rams 20 and 20. 52 rear part is fixed. The rear support 40 has a certain height, the bottom surface of the engine mounting table 52 is disposed above the main frames 20 and 20, and a space is provided between the lower side of the engine mounting table 52 and the main frames 20 and 20. Is provided.
[0015]
A muffler 11 is arranged in a space between the lower part of the engine mounting table 52 and the main frames 20 and 20. An exhaust pipe 53 provided on the left side of the engine 9 extends downward to the muffler 11, and exhaust gas is sent to the muffler 11 through the exhaust pipe 53. The muffler 11 is covered by a muffler cover 80 that is a shielding material, and blocks heat from the muffler 11 and does not transmit noise to the seat 36 side. The muffler cover 80 has a cylindrical shape covering the outer peripheral surface of the muffler 11, the rear end is opened, the exhaust port 11a of the muffler 11 protrudes downward, and exhaust gas is exhausted to the outside. Furthermore, the vibration of the engine 9 is not directly transmitted, and the solid sound of the muffler 11 is reduced.
[0016]
Next, an engine room in which the engine 9 is mounted will be described. As shown in FIGS. 2 and 5 to 8, the engine mounting table 52 is formed of a sound insulating material, and a front portion of the engine 9 is sound-insulated at a vertical portion of the engine mounting table 52. The left and right side surfaces of the engine 9 are covered by left and right sound insulation covers 57 and 58, and the rear and lower sides of the engine 9 are covered by L-shaped rear sound insulation covers 59. The upper part of the engine 9 covered by the sound insulation covers 57, 58, 59 and the engine mounting table 52 is covered with a bonnet 45 to form an engine room 60. The engine room 60 transmits the transmitted sound as a transmitted sound to an operator who rides on the seat 36, thereby reducing noise propagation by the engine 9. Further, the muffler 11 and the engine 9 are blocked by the bottom surface of the engine mounting table 52 that forms the lower surface of the engine room 60, and the heat of the muffler 11 is not transferred into the engine room 60.
[0017]
Next, a heat balance configuration of the engine 9 in the engine room 60 will be described. As shown in FIGS. 4 and 6 to 8, an opening 60 b is provided in the left side surface (the left sound insulation cover 57) of the engine room 60, and the cooling air inlet duct 86 is guided to the outside of the engine room 60 from the opening 60 b. The front part of the cooling air inlet duct 86 projects forward of the engine room 60 so as to introduce cool air. An exhaust port 60 a is provided between the upper portion of the rear sound insulation cover 59 that forms the rear surface of the engine room 60 and the rear portion of the bonnet 45.
[0018]
Further, the outer peripheral surface of the exhaust pipe 53 in the engine room 60 is covered with an exhaust duct 81. The exhaust duct 81 is a columnar cylindrical body, and an opening for introducing cooling air is provided above the exhaust duct 81. The lower part of the exhaust duct 81 penetrates the lower surface of the engine room 60 and communicates with the inside of the muffler cover 80.
[0019]
With this configuration, when the cooling fan in the fan cover 85 is driven, the cool air in front of the engine room 60 from the front of the cooling air inlet duct 86 is introduced into the cooling air inlet duct 86 and the engine is supplied from the fan cover 85 to the engine. The engine 9 is cooled by blowing air as cooling air for cooling 9 as indicated by an arrow a in the figure. Most of the cooling air after cooling the engine 9 is exhausted rearward from the exhaust port 60a as shown by an arrow b, and a part of the cooling air after cooling is introduced from the upper end of the exhaust duct 81 as shown by an arrow c. Then, the air is blown into the muffler cover 80, the muffler 11 is cooled, and the exhaust gas is exhausted from the rear part of the muffler cover 80. By lowering the temperature of the muffler 11, the sound speed due to the exhaust is lowered and noise is reduced.
[0020]
Therefore, the engine room 60 for sound insulation is formed as a duct for cooling air that guides cooling air, and the opening ratio of the engine room 60 can be made as small as possible. In the present embodiment, the opening ratio of the engine room 60 is reduced to 10%, and a noise reduction duct type engine room 60 having a high noise reduction effect is configured.
[0021]
The muffler 11 is disposed below the engine room 60. However, the position of the muffler 11 is not limited as long as it is outside the engine room. For example, the muffler 11 is disposed at the rear of the engine room 60 and the exhaust duct extends to that position. Thus, the engine room 60 can be formed as a similar cooling air duct.
[0022]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained. In other words, the engine housed in the vehicle body frame is covered with an engine room formed of a sound insulation material, the engine room is erected from the main frame, fixed to the upper part of the support body, and the muffler is arranged below the engine room By forming the space to be used, the muffler arranged outside the engine room can be arranged so as not to be bulky in the front-rear direction, and the body can be made compact. Further, the engine is connected to the engine via an exhaust pipe, and the vibration of the engine is not directly transmitted, so that solid sound due to the vibration of the muffler can be reduced. In addition, exhaust gas can be exhausted to place a muffler that serves as a heat source outside the engine room, reducing the amount of heat emitted from the engine room, causing heat to stay in the engine room, and overheating the engine. It does not cause any problems.
[0023]
According to a second aspect of the present invention, a cooling air inlet duct is connected to a fan cover that houses a fan arranged on the engine side portion, and the cooling air inlet duct projects forward from the engine room side portion. The front cool air can be sucked, and the cooling air that has cooled the engine is exhausted from the exhaust port at the rear of the engine room. In addition, the muffler arranged in the lower part of the engine room is covered with a muffler cover, the muffler cover and the engine room communicate with each other through an exhaust duct, and a part of the cooling air is introduced into the muffler cover through the exhaust duct. In addition, the exhaust gas temperature can be lowered by cooling the muffler, and the exhaust noise can be reduced. As described above, the duct configuration for transporting the cooling air in the engine room can reduce the opening ratio of the engine room, improve the cooling performance, and improve the silencing effect.
[Brief description of the drawings]
FIG. 1 is a right side view of a passenger work vehicle formed by a pipe-shaped body frame.
FIG. 2 is a side sectional view of a passenger work vehicle that houses an engine room in a body frame.
FIG. 3 is a plan sectional view of the same.
FIG. 4 is a perspective view of an engine having a cooling air inlet duct on its side.
FIG. 5 is a partial perspective view of an engine room on which the engine is mounted.
FIG. 6 is a left side view of a passenger work vehicle in which a cooling air inlet duct projects from an engine room.
FIG. 7 is a plan sectional view of a cooling duct type engine room.
FIG. 8 is a side cross-sectional view of the engine room.
FIG. 9 is a side sectional view showing an internal configuration of a conventional engine room.
FIG. 10 is a side view showing a support configuration of an engine mounting table on which an engine is mounted.
[Explanation of symbols]
A Passenger work vehicle 1 Body frame 9 Engine 11 Muffler 20 Main frame 21 Subframe 40 Rear support 52 Engine mounting base 53 Exhaust pipe 60 Engine room 60a Exhaust port 80 Muffler cover 81 Exhaust duct 85 Fan cover 86 Cooling air inlet duct

Claims (2)

In a passenger work vehicle in which the engine is housed in a subframe that forms a main frame and an outer frame arranged at the lower part and the outer peripheral surface of the engine is covered with a sound insulating material, the lower surface of the engine mounting table on which the engine is mounted is the main frame A cooling structure for an engine room, which is supported by an upper part of a rear support body provided laterally at a rear part, and a muffler is disposed between a lower surface of the engine room and a main frame. 2. A configuration in which a muffler is disposed at the lower part of the engine room according to claim 1, wherein a cooling air inlet duct is fixed to a fan cover that covers the engine side, and the cooling air inlet duct projects forward from the side of the engine room. A cooling structure for an engine room, wherein an exhaust duct connected to a muffler cover for covering the muffler is provided in the engine room, and an exhaust port is opened on the rear surface of the engine room.

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