JP2010208471A - Engine arrangement structure of off-road traveling four-wheel vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine arrangement structure of an off-road four-wheel vehicle that stabilizes the traveling of a vehicle body by arranging the engine as close to the front of the vehicle body as possible. <P>SOLUTION: The engine arrangement structure includes a pair of right and left front wheels 2, a pair of right and left rear wheels 3, a cabin 5 that is formed by a cabin frame 4 between the front wheels 2 and the rear wheels 3 and houses an operation part 11 and seats 9, 10. The seats 9, 10 are each formed in a bench shape, and at least a part of an engine 13 is arranged in the space under the seats 9, 10. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an engine arrangement structure for a four-wheel vehicle for rough terrain.

  Four-wheeled vehicles for rough terrain (so-called Utility vehicles) used for various purposes, such as leisure vehicles such as hunting vehicles or agricultural vehicles, have bench seats. is there. In such a four-wheel vehicle for rough terrain, the engine is arranged under the loading platform located at the rear part of the seat so that the engine arrangement does not affect the height of the seat. A rough terrain four-wheeled vehicle in which an engine is arranged under a loading platform is disclosed in Patent Document 1.

JP 2004-330901 A

  However, luggage is often loaded on the rear loading platform of a four-wheel vehicle for rough terrain, and the engine, which is a heavy object, must be placed as much as possible in the front of the vehicle to stabilize the vehicle. preferable.

  In order to achieve the above object, the present invention is formed by a cabin frame between a pair of left and right front wheels, a pair of left and right rear wheels, and the front wheels and the rear wheels, and stores an operation unit and a seat. An engine arrangement structure for a four-wheel vehicle for rough terrain including a cabin, wherein the seat is configured in a bench shape, and at least a part of the engine is arranged in a lower space of the seat. It is characterized by being.

  According to the said structure, the engine which is a heavy article is arrange | positioned ahead rather than arrange | positioning under the loading platform located in a seat rear part. As a result, the weight distribution of the entire vehicle body is optimized, and traveling stability can be improved.

The present invention preferably further comprises the following configuration.
(1) At least a part of a crankcase constituting the engine is disposed in a lower space of the seat.

(2) The seat includes a front seat and a rear seat located behind the front seat, and the engine reaches a lower space of the rear seat from a lower space of the front seat. Arranged in space.

(3) The engine has one or a plurality of cylinders, and the cylinders are horizontal or inclined.

(4) In the configuration (3), the cylinder is tilted forward, and the tilt angle is approximately 60 ° or greater and approximately 70 ° or less with respect to the vertical direction.

(5) The engine is connected to one end of the intake device on the intake downstream side, and an intake port for taking in outside air located at the other end of the intake device on the intake upstream side is disposed in the bonnet. Yes.

(6) The engine is connected to one end portion on the intake downstream side of the intake device, and the intake port for taking in outside air located at the other end portion on the intake upstream side of the intake device is provided on the lower side of the rear seat. Arranged in space.

(7) In the configuration (5) or (6), the intake device has an air chamber, and the air chamber is provided in the vicinity of the engine.

(8) The engine is connected to one end portion on the exhaust upstream side of the exhaust device, and the exhaust pipe of the exhaust device is directed leftward from the left side portion of the engine and close to the lower left side portion of the engine to the rear portion. It is arranged to face.

(9) The engine is connected to one end of the exhaust device upstream of the exhaust, and the exhaust pipe of the exhaust device faces leftward from the left side of the engine and has a distance from the left side of the engine, It is arranged to go to the rear.

  According to the configuration (1), at least a part of the crankcase configuring the engine is disposed in the lower space of the seat. Here, the engine includes a cylinder block, a crankcase, an oil pan, a generator, a transmission, and the like. In the lower space of the seat, at least a part of the constituent parts of the engine may be arranged. However, in the constitution (1), at least a part of the crankcase is heavier than the other constituent parts of the engine. However, since it is arranged in the lower space of the seat, the heavy object is arranged in front of the vehicle body, the weight distribution of the entire vehicle body is optimized, and traveling stability can be improved.

  According to the configuration (2), the heavy engine is disposed more forward than the engine disposed below the rear seat. As a result, the weight distribution of the entire vehicle body is made more appropriate, and the running stability can be further improved.

  According to the configuration (3), the overall height of the engine can be reduced. Since the engine is disposed at the lower part of the seat, the seat height of the seat can be lowered by reducing the overall height of the engine. And the boarding / alighting to a vehicle body can be performed easily because the seat height of a sheet | seat becomes low. Further, since the movement of the piston in the cylinder is horizontal or inclined, vibration due to the movement is not easily transmitted to the person sitting on the seat, and the seat comfort is improved. In addition, since the position of the center of gravity of the vehicle body is lowered, the running stability of the vehicle body can be further improved.

  According to the configuration (4), it is not necessary to separately form an oil return line of the engine in the cylinder while keeping the overall height of the engine low, and the cost of parts can be reduced.

  According to the configuration (5), since the distance between the occupant and the intake port is increased, it is possible to reduce the intake sound during inspiration that the occupant feels.

  According to the configuration (6), the length of the intake pipe constituting the intake device can be shortened. As a result, a wide space in the lower part of the front half of the vehicle can be secured, and the cost of the intake pipe can be kept low.

  According to the configuration (7), since the air chamber that can store intake air is provided in the vicinity of the engine, the air supply to the engine can be stably performed. The intake performance can be maintained.

  According to the configuration (8), the length of the exhaust pipe from the engine to the exhaust muffler can be shortened. As a result, the influence of the deformation of the exhaust pipe due to the heat of the exhaust gas can be reduced. Further, since the length of the exhaust pipe can be shortened, the exhaust device can be accommodated in a compact manner, and further, the cost of the exhaust pipe can be reduced.

  According to the configuration (9), since the exhaust pipe is disposed at a distance from the engine, the heat of the exhaust gas can be prevented from being transmitted to the engine.

  In short, according to the present invention, the heavy engine is disposed more forward than the engine disposed below the loading platform located at the rear portion of the rear seat. As a result, the weight distribution of the entire vehicle body is optimized, and traveling stability can be improved.

1 is a left side view of a four-wheel traveling vehicle for rough terrain having an engine arrangement structure (including an intake pipe arrangement structure) according to a first embodiment of the present invention. FIG. 2 is a top perspective view of FIG. 1. 1 is a left side view of a four-wheel traveling vehicle for rough terrain having an engine arrangement structure (including an exhaust pipe arrangement structure) according to a first embodiment of the present invention. FIG. 4 is a top perspective view of FIG. 3. FIG. 6 is a left side view of a four-wheel traveling vehicle for rough terrain having an engine arrangement structure (including an intake pipe arrangement structure) according to a second embodiment of the present invention. FIG. 6 is a top perspective view of FIG. 5. FIG. 6 is a left side view of a four-wheel traveling vehicle for rough terrain having an engine arrangement structure (including an exhaust pipe arrangement structure) according to a third embodiment of the present invention. FIG. 8 is a top perspective view of FIG. 7.

  1 to 4 show a first embodiment of an engine arrangement structure according to the present invention, and an embodiment of the present invention will be described based on these drawings.

[First Embodiment]
FIG. 1 is a partially broken left side view of a small four-wheel traveling vehicle for rough terrain (so-called Utility vehicle) having an engine arrangement structure according to the present invention. FIG. 2 is a top perspective view of FIG. In FIG. 1, the four-wheel vehicle for rough terrain includes a pair of left and right front wheels 2 at the front portion of the body frame 1, and a pair of left and right rear wheels 3 at the rear portion of the body frame 1. 3 is provided with a cabin 5 surrounded by a cabin frame 4, a cabin 6 is provided behind the cabin 5, a bonnet 7 in front of the cabin 5, a pair of left and right fenders (not shown), and a bumper 8 mag.

  As shown in FIG. 2, the vehicle body frame 1 includes a right main frame member 21, a left main frame member 22, a right front frame member 23, a left front frame member 24, a right rear frame member 25, a left rear frame member 26, A plurality of cross members 27 and a plurality of reinforcing members 28 are provided. The right front frame member 23 is positioned near the right side of the vehicle width center portion at the front of the vehicle body, and the left front frame member 24 is positioned near the left side of the vehicle width center portion of the front portion of the vehicle body. The right rear frame member 25 and the left rear frame member 26 support the loading platform 6.

  A bench-shaped front seat 9 is installed in the front half of the cabin 5, a bench-shaped rear seat 10 is installed in the rear half of the cabin 5, and a dashboard (operation unit) 11 is installed at the front end of the cabin 5. Is provided.

  The engine room 12 is formed so as to extend from the lower space of the front seat 9 to the lower space of the rear seat 10, and is located at a substantially central portion in the vehicle width direction (left-right direction) of the vehicle body. An engine 13 is housed in the room 12 and supported by the body frame 1. In the present embodiment, the engine 13 is a single cylinder engine and has a single cylinder 14 inclined forward. In particular, in order to reduce the overall height of the engine 13, the inclination angle of the cylinder 14 is set to, for example, an inclination angle of approximately 60 ° or more and approximately 70 ° or less with respect to the vertical direction. The engine 13 may have a plurality of cylinders, and may have other types of cylinders such as a V type or a horizontal type.

  The intake pipe 15 constituting the intake device is connected to an air chamber 16 provided at one end of the intake downstream side above the engine 13 and extends forward from the front left side of the air chamber 16 to the intake pipe 15. The other end of the intake air upstream side is connected to an air cleaner 17 provided in the bonnet 7. The air cleaner 17 is provided with an intake port 171, and air sucked from the intake port 171 is purified by the air cleaner 17, stored in the air chamber 16 through the intake pipe 15, and then taken into the engine 13. It has become.

  The air chamber 16 is positioned above the engine 13 and is formed so as to extend from the rear lower part of the front seat 9 to the front lower part of the rear seat 10. The height in the vertical direction of the air chamber 16 is low so as not to interfere with the front sheet 9.

  FIG. 3 is a left side view of a four-wheel traveling vehicle for rough terrain having an engine arrangement structure (including an exhaust pipe arrangement structure) according to the first embodiment of the present invention. 4 is a top perspective view of FIG. An exhaust pipe 18 constituting an exhaust device connected to an exhaust port of the engine 13 extends from the left side of the front part of the engine 13 to the left, and extends toward the rear part near the lower left side of the engine 13. It passes through the lower part of the belt converter 131 and is connected to the center in the left-right direction at the front of the exhaust muffler 19 disposed below the loading platform 6.

  In the present embodiment, since the engine 13 is disposed in the engine room 12 from the lower space of the front seat 9 to the lower space of the rear seat 10, the heavy engine 13 is disposed in the rear portion of the rear seat 10. Compared to the arrangement below the loading platform 6 located at the front, the arrangement is more forward. As a result, the weight distribution of the entire vehicle body is optimized, and traveling stability can be improved.

  In the present embodiment, since the cylinder 14 of the engine 13 is tilted forward, the overall height of the engine 13 can be lowered. Since the engine 13 is disposed at the lower part of the front seat 9, the seat height of the front seat 9 can be reduced by reducing the overall height of the engine 13. And the boarding / alighting to a vehicle body can be performed easily because the seat height of the front seat 9 becomes low. Further, when the movement of the piston in the cylinder 14 approaches the horizontal direction, vibration due to the movement is not easily transmitted to the person sitting on the front seat 9, and the seating comfort of the front seat 9 is improved. Further, since the overall height of the engine 13 is lowered, the position of the center of gravity of the vehicle body is lowered, and the running stability of the vehicle body is further improved.

  In the present embodiment, the inclination angle due to the forward inclination of the cylinder 14 is approximately 60 ° or more and approximately 70 ° or less with respect to the vertical direction. As a result, there is no need to separately form an oil return line for the engine 13 in the cylinder, which is necessary when the inclination angle of the cylinder 14 approaches horizontal while keeping the overall height of the engine 13 low. Parts cost can be reduced.

  In the present embodiment, the engine 13 is connected to one end of the intake pipe 15 on the intake downstream side, and the intake port 171 located at the other end of the intake pipe 15 on the intake upstream side is disposed in the hood 7. . As a result, since the distance between the passenger and the air inlet 171 is increased, it is possible to reduce the intake sound at the time of inhalation that the passenger feels.

  In the present embodiment, the air chamber 16 of the engine 13 is provided in the vicinity of the engine 13. As a result, air supply to the engine 13 can be stably performed, and as a result, the intake performance of the engine 13 at the time of medium / low speed can be maintained.

  Moreover, since the vertical height of the air chamber 16 does not interfere with the front sheet 9, it is possible to prevent the height of the front sheet 9 from being increased by the air chamber 16.

  In the present embodiment, the engine 13 is connected to one end of the exhaust pipe 18 on the exhaust upstream side, and the exhaust pipe 18 heads leftward from the left side of the engine 13 and heads toward the rear near the left side of the engine 13. It is arranged like this. As a result, the length of the exhaust pipe 18 from the engine 13 to the exhaust muffler 19 can be shortened, so that the influence of the deformation of the exhaust pipe 18 due to the heat of the exhaust gas can be reduced. Moreover, since the length of the exhaust pipe 18 can be shortened, the exhaust equipment can be accommodated in a compact manner, and the cost of the exhaust pipe 18 can be reduced.

[Second Embodiment]
FIG. 5 is a partially broken left side view of a four-wheel vehicle for rough terrain having another intake pipe 15 route. 6 is a top perspective view of FIG. The intake pipe 15 constituting the intake device is connected to an air chamber 16 provided on the upstream side of the engine 13 at one end of the intake downstream side. The intake pipe 15 extends rearward from the rear portion of the air chamber 16 and The other end of the side is connected to an air cleaner 17 located below the rear seat 10. The air cleaner 17 is provided with an intake port 171. Air sucked from the intake port 171 is purified by the air cleaner 17, stored in the air chamber 16 through the intake pipe 15, and then taken into the engine 13. It has become.

  In the present embodiment, since the air cleaner 17 can be disposed near the rear of the air chamber 16, the length of the intake pipe 15 can be shortened. As a result, compared to the first embodiment, a wide space in the lower portion of the front half in the cabin 5 can be secured, and the cost of the intake pipe 15 can be reduced.

  Other configurations of the second embodiment are the same as those of the first embodiment.

[Third Embodiment]
FIG. 7 is a partially broken left side view of a four-wheel vehicle for rough terrain having another exhaust pipe 18 route. FIG. 8 is a top perspective view of FIG. The exhaust pipe 18 constituting the exhaust system is directed leftward from the front left side of the engine 13, has a distance from the left side of the engine 13, and also has a distance from the left side of the belt converter 131, toward the rear. It extends so as to face and is connected to a central portion in the left-right direction of an exhaust muffler 19 disposed below the loading platform 6.

  In the present embodiment, since the exhaust pipe 18 is disposed at a distance from the engine 13, it is possible to make it difficult for heat from the exhaust pipe 18 to be transmitted to the engine 13.

  Other configurations of the third embodiment are the same as those of the first embodiment or the second embodiment.

  The present invention is not limited to the structure of the embodiment described above, and includes various modifications that can be considered without departing from the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Body frame 2 Front wheel 3 Rear wheel 4 Cabin frame 5 Cabin 6 Loading platform 7 Bonnet 8 Bumper 9 Front seat 10 Rear seat 11 Dashboard 12 Engine room 13 Engine 14 Cylinder 15 Intake pipe 16 Air chamber 17 Air cleaner 171 Inlet 18 Exhaust pipe 19 Exhaust muffler

Claims (10)

A rough terrain four comprising a pair of left and right front wheels, a pair of left and right rear wheels, and a cabin that is formed by a cabin frame between the front wheels and the rear wheels and that stores an operation unit and a seat. An engine arrangement structure for a wheeled vehicle,
The seat is configured in a bench shape,
An engine arrangement structure for a four-wheel vehicle for rough terrain, wherein at least a part of the engine is arranged in a lower space of the seat.   The engine arrangement structure of a four-wheel drive vehicle for rough terrain according to claim 1, wherein at least a part of a crankcase constituting the engine is arranged in a lower space of the seat. The seat has a front seat and a rear seat located behind the front seat,
The engine arrangement structure of a four-wheel vehicle for rough terrain according to claim 1 or 2, wherein the engine is arranged in a space from the lower space of the front seat to the lower space of the rear seat. The engine has one or more cylinders;
The engine arrangement structure for a four-wheeled vehicle for rough terrain according to any one of claims 1 to 3, wherein the cylinder is horizontal or inclined.   5. The engine arrangement structure for a four-wheel vehicle for rough terrain according to claim 4, wherein the cylinder is inclined forward, and an inclination angle thereof is approximately 60 ° or more and approximately 70 ° or less with respect to a vertical direction. The engine is connected to one end of the intake device on the intake downstream side;
The four-wheels for rough terrain according to any one of claims 1 to 5, wherein an intake port for taking in outside air located at the other end portion of the intake device on the upstream side of intake is disposed in the bonnet. Engine arrangement structure for traveling vehicles. The engine is connected to one end of the intake device on the intake downstream side;
6. The intake port according to claim 1, wherein an intake port for taking in outside air, which is located at the other end portion on the intake upstream side of the intake device, is disposed in a lower space of the rear seat. Engine arrangement structure for four-wheel vehicles for rough terrain. The intake device has an air chamber;
The engine arrangement structure for a four-wheel vehicle for rough terrain according to claim 6 or 7, wherein the air chamber is provided in the vicinity of the engine. The engine is connected to one end of the exhaust device upstream of the exhaust;
The exhaust pipe of the exhaust device is disposed so as to be directed leftward from the left side of the engine and toward the rear in the vicinity of the lower left side of the engine. The engine arrangement structure of the four-wheel vehicle for rough terrain described. The engine is connected to one end of the exhaust device upstream of the exhaust;
The exhaust pipe of the exhaust device is disposed so as to go to the left from the left side of the engine and to the rear with a distance from the left side of the engine. The engine arrangement structure for four-wheel vehicles for rough terrain described in 1.

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