JPH02109727A - Driving device for vehicle running on rough terrain - Google Patents

Abstract

PURPOSE:To avoid interference of a cylinder with a seat back and shorten the dimension of a body in longitudinal direction by projecting an engine cylinder above a crankcase in transverse direction and providing the engine under the rear of the seat back. CONSTITUTION:A seat 49 with a seat back 49b inclined rearward is provided at the longitudinal middle position of a body frame 2. An engine 32 is provided behind a seat 49, i.e., at the rear of the body frame 2. The cylinder of the engine 32 is projected above a crankcase in the transverse direction. The engine 32 is provided under the rear of the seat back 49b. Thus a totally low profile and wider engine 32 extending in transverse direction is formed and housed in a space surrounded by the rear of both side frames 3, rear roll bar 11, main stay 13, connecting bar 14 and auxiliary stay 15.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a drive device for an all-terrain vehicle that reduces the length of a vehicle body in the longitudinal direction.

(Prior Technology) Conventionally, uneven terrain vehicles (so-called buggy vehicles) used for leisure and sports have a seat installed in the middle of the front and back of the vehicle body, and behind this seat, a seat is installed at the rear of the vehicle body frame. At the same time as installing the engine, a pair of left and right rear arms are pivoted to the rear of the vehicle body frame so as to be able to swing up and down, and a rear wheel is supported at the swinging end of this rear arm, and this rear wheel is interlocked and connected to the engine mentioned above. There are some that have made it possible for vehicles to run.

(Problems to be Solved by the Invention) Incidentally, in this type of vehicle, it is desired that the front and rear dimensions of the small body be as short as possible7.Therefore, in order to satisfy this requirement, firstly, in the above configuration, the seat is When a vehicle has a seat back that slopes rearward, it is possible to utilize the space below the rear of the seat back to house the engine there, thereby shortening the front-to-back dimension of the vehicle body.

However, the cylinder of a conventional engine protrudes upward from the crankcase side, so even if you try to store the engine in the space below the rear of the seatback as shown above, the top of the cylinder will come into contact with the rear surface of the seatback. do,
There is a disadvantage that this storage is not easy.

Second, it is conceivable to shorten the length of the rear arm in the above configuration. However, if the length of the rear arm is shortened, when the rear arm swings up and down, the amount of dimensional change in the wheel base in response to the swing becomes large, which is unfavorable in terms of maneuverability.

(Purpose of the Invention) This invention was made in view of the above-mentioned circumstances, and by rationally arranging each component of an all-terrain vehicle, the vehicle body can be improved without causing any hindrance to other vehicles. The purpose is to shorten the front and rear dimensions of the

(Structure of the Invention) The first invention for achieving the above object is characterized by providing a seat with a rearwardly sloping seat back, and installing an engine behind the seat at the rear of the vehicle body frame. In the drive device of a vehicle traveling on rough terrain,
The cylinder of the engine is made to protrude from the crankcase in the vehicle width direction, and the engine is disposed behind and below the seat back.

Further, the second invention is characterized in that the power take-off portion of the engine is provided on the side of the engine, and a pair of left and right rear arms are pivotally supported at the rear of the vehicle body frame so as to be able to swing vertically. In a drive device for an all-terrain vehicle in which a rear wheel is supported at a swinging end and the rear wheel is interlocked and connected to the power take-off part, the power take-off part is provided at the front part of the side of the engine, and the power take-off part is provided at the front part of the side of the engine, and The pivot point of the rear arm is located near the power take-off section when viewed from the side.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

(First example) 1 to 5 show a first embodiment.

In the figure, l is a vehicle traveling on rough terrain, and an arrow Fr in the figure indicates the front thereof.

2 is the body frame of this vehicle l, this body frame 2
has left and right side frames 3.4 extending in the front-rear direction. Among the above, the left side frame 3 is composed of a pair of upper and lower frames 3a and 3b, and a connecting frame 3c that connects the front and rear middle portions of these frames to each other. The right side frame 4 also has the same configuration as the left side frame 3, and is composed of an upper frame 4a, a lower frame 4b, and a connecting frame 4c.

The front ends of the left and right side frames 3.4 are connected to each other by a front cross member 6, and the left and right lower frames 3b,
4b are connected to each other by a rear cross member 7 made of circular pipe, and the left and right lower frames 3b, '4
The front and rear intermediate portions of b are connected to each other by an intermediate cross member 8 made of a circular pipe.

The vehicle body frame 2 is provided with arch-shaped front and rear roll pars 10 and 11 that are spaced apart from each other in the front and rear. Of these, the left and right ends of the front roll par lO are the left and right upper frames 3a, 4a.
On the other hand, each left and right end of the rear roll par 11 is welded to a bracket plate 12 protruding from each rear part of the left and right lower frames 3b, 4b.
The upper and lower middle portions of are welded to the respective rear ends of the left and right upper frames 3a and 4a.

The rear roll par 11 is inclined rearward as it moves upward, and its upper and lower middle parts and the rear ends of the left and right lower frames 3b and 4b form a pair of left and right main stays 13.13 that form a rear ramp.
are connected by. In addition, the left and right main stays 13.
A connecting par 14 is provided which connects the upper and lower middle parts of the roller pars 13 to each other, and the left and right middle parts of the connecting par 14 and the upper part of the rear roll par 11 are connected by a pair of left and right sub stays 15 and 15. That is, the rear rollper 11 is connected to each stay 1.
3.15 and is firmly connected to the rear portions of the left and right side frames 3.4.

The left and right ends of the front cross member 6 protrude outward beyond the left and right side frames 3.4. A front arm 18 is pivotably supported by a pivot shaft 17 at each of the projecting ends so as to be vertically swingable, and a front wheel 19 is supported at each swinging end so as to be freely steerable. A shock absorber 20 is installed between the swinging end of each front arm 18 and each corresponding side portion of the front roll par lO, and this shock absorber 20 allows each front wheel 19 to move away from the running surface 21. Buffers the impact received. In the above case, the front wheel 19 is provided at approximately the same position as the front rollper 10 in the front-rear direction.

On the other hand, at the rear of the lower left frame 3b and at the right end of the rear cross member 7, brackets 23 that are approximately U-shaped when viewed from the front are provided to protrude upward, and the protruding ends of each bracket 23 are provided with brackets 23, respectively. A rear arm 25 is pivotably supported by a pivot shaft 24 so as to be vertically swingable. A rear axle tube 27 extending in the vehicle width direction is welded to the swinging ends of the left and right rear arms 25, and a rear wheel 29 is attached to each end of a rear axle 28 rotatably supported by the rear axle tube 27. There is. Further, a shock absorber 30 is installed between the rear axle tube 27 and the connecting bar 14, and this shock absorber 30 buffers the impact that each rear wheel 29 receives from the running surface 21. In the above case, the rear wheel 29 is located more rearward than the rear rollper 11.

32 is a four-cycle engine, and this engine 32 is installed at the rear of the left and right lower frames 3b, 4b, and at the rear roll par 11.
It is housed in a space 31 surrounded by the main stay 13, the connecting bar 14, and the sub-stay 15, which has a triangular shape in side view and extends from side to side. This engine 32 is connected to a bracket 33 that protrudes from the rear roll par 11 and the main stay 13.
Supported by In this case, the rear portions of the left and right lower frames 3b and 4b, the rear roll par 11, the main stay 13, etc. constitute a strong truss frame, and the engine 32 is supported by this. is strongly supported.

This engine 32 is provided with a drive chain 34 which is a power take-off part, and on the other hand, a driven chain wheel 35 is attached to the rear axle 28, and a transmission chain 36 is attached to both chain wheels 34 and 35.
is wrapped around it. Then, if the power of the engine 32 is transmitted to the rear wheels 29 via the transmission chain 36, etc.,
Vehicle l is now able to travel.

In addition, 38 is an exhaust muffler, 39 is a fuel tank, and this fuel tank 39 is supported by the said rear roll par 11 by the bracket 40. Further, 42 is a brake, and this brake 42 is composed of a disc 43 attached to the rear axle 28 and a caliper 44 that is attached to the rear axle tube 27 side and clamps the disc 43 during braking. Further, 45 is a bumper.

A seat 49 on which a passenger 48 sits is provided between the front and rear roll pars 10 and 11. The seat 49 is composed of a seat cushion 49a and a seat back 49b integrally molded with the seat cushion 49a and inclined rearward. The space between the left and right side frames 3.4 from the front and back midway of the lower surface of the seat cushion 49a to the front cross member 6 is closed by a floor panel 50 made of sheet metal. In the above state, the seat cushion 49a is supported by the left and right lower frames 3b, 4b and the rear end portion 50a of the floor panel 50. Further, the seat back 49b is supported on the front surface of the rear roll par 11, and therefore the space 31
is located at the lower rear of the seat back 49b.

A pair of left and right footrests 52, 52 on which the occupant 48 rests his/her feet 48a are provided substantially horizontally forward of the seat 49, and each of these footrests 52 is attached to the upper surface of the floor panel 50. A brake bezel 53 is provided in front of the left footrest 52 among the footrests 52 and 52.
When the driver depresses the brake 42, the brake 42 brakes the rear wheel 29. Further, an accelerator pedal 54 is provided in front of the right footrest 52, and when the accelerator pedal 54 is depressed, the vehicle 1 is accelerated by the operation of the engine 32.

The shift lever 156 55 is a switch box, and the switch box 56 is supported by and protected by a bracket vibe 57 protruding from the outside of the upper right frame 4a.

Further, 58 is a battery, and this battery 58 is attached to the outside of the upper right frame 4a behind the bracket vibe 57, and when the vehicle l is running, the battery 58 is
The bracket vibe 57 protects the bracket from coming into contact with obstacles.

In the above case, the front rollper 10 is attached to both legs 48a of the occupant 48.
, 48a from above, and is formed sufficiently low to provide a wide front view. On the other hand, the upper end of the rear roll par 11 extends above the head of the occupant 48.

A steering shaft 61 is provided in a substantially central portion in the vehicle width direction between the seat 49 and the left and right footrests 52,52. This steering shaft 61 is supported by the vehicle body frame 2 in the following manner. That is, a U-shaped steering bracket 62 in plan view projects rearward from the left and right center portions of the front roll parlO, and a steering shaft 61 is rotatably supported at the projecting end. A steering handle 63 is attached to the rear end of the steering shaft 61 facing the passenger 48.
The front ends of the wheels 1 are interlocked and connected to the front wheels 19 and 19 via a pair of left and right tie rods 64 and 64, respectively. Then, by turning the steering handle 63, each front wheel 19 is steered, that is, the vehicle 1 can be steered.

In the above case, the steering bracket 62 is located between the left and right legs 48b of the occupant 48, that is, the space above each leg 48b is open to the outside of the vehicle except for the front roll par IO part. . Therefore, the bending operation of the leg 48b when the brake pedal 53 or the accelerator pedal 54 is depressed or when getting on or off the vehicle 1 can be easily performed by utilizing the above-mentioned space.

Further, in the above configuration, the seat cushion 49a
The lower surface of the left and right side frames 3 is arc-shaped in side view.
．． It protrudes downward from the lower surface of 4. And crew member 4
8 is seated, the seating surface 49c of the seat cushion 49a is the same as each footrest surface 52a of the footrest 52.52.
It is designed to be lower than the

The rear end portion 50a of the floor panel 50 is bent upward to protect the front surface of the lower surface of the seat cushion 49a. Therefore, while the vehicle l is running,
When the lower surface of the seat cushion 49a comes into contact with the convex surface of the running surface 21, the rear end 50a smoothly slides into contact with the convex surface, thereby protecting the seat 49.

In addition, 66 is a center protector, the rear end of which is pivoted to the upper end of the rear roll par 11 so as to be vertically movable, and the front end of the center protector 66 is pivoted to the upper end of the rear roll par 11.
It is detachably attached to the upper end of O with a bolt. By rotating the center protector 66 upward, the occupant 48 can easily get on and off the vehicle 1. Further, when the front end of the center protector 66 is rotated downward and attached to the front roll par 10, the center protector 66 covers the occupant 48 on the seat 49 from above.

The engine 32 will be explained in more detail with reference to FIG.

This engine 32 has a crankcase 68, and a crankshaft 6 extending in the front-rear direction is disposed inside the crankcase 68.
9 is supported. And this crank case 68
A cylinder 70 protrudes rightward from the cylinder 70, and a piston 71 within the cylinder 70 and the crankshaft 69 are interlocked and connected by a connecting rod 72. In this case, since the cylinder 70 of the engine 32 protrudes in the vehicle width direction, the engine 32 has an overall horizontally elongated shape extending in the vehicle width direction with a low height. Therefore, this engine 32
It is stored so that it fits into 1.

A power transmission case 74 is located on the left side of the crankcase 68.
is integrally molded, and a gear type transmission 75 is contained within this power transmission case 74. An input shaft 76 of this transmission 75 extends parallel to the crankshaft 69.
6 is connected to the crankshaft 69 via a clutch 77. On the other hand, the output shaft 78 of the transmission 75 also extends parallel to the crankshaft 69, and a drive bevel gear 79 is attached to its front end. It is supported by the department.

A gear shaft 80a of this driven bevel gear 80 extends in the vehicle width direction, and its left end projects outside the power transmission case 74, and the drive chain wheel 34 is attached to this projecting end.

Further, in the above case, the engine 32 is sandwiched between the rear arms 25.25 from the left and right, and the pivot shaft 24.24, which is the pivot portion of the rear arms 25, 25 with respect to the vehicle body frame 2, is coaxial with the gear shaft 80a. It is located above. Therefore, the front parts of the left and right rear arms 25.25 cover both sides of the engine 32 including the drive chain wheel 34, which is a power take-off part, from the outside over the entire front and back direction. 32 will be effectively protected. This is extremely beneficial for vehicles traveling on rough terrain, such as buggies, in terms of preventing damage to the engine 32.

Note that the pivot shafts 24, 24 do not need to be coaxial with the gear shaft 80a, and may be provided near the gear shaft 80a when viewed from the side. Further, in the above embodiment, the engine 32 and the rear wheel 29
Although the two are connected by a chain transmission means, they may be connected by a drive shaft instead.

(Second Embodiment) FIGS. 6 and 7 show a second embodiment of the present invention.

In the figure, each of the brackets 23 is installed on the rear cross member 7, and the left bracket 23 is located at the bottom left of the engine 32, and the right bracket 23 is located at the bottom left of the engine 32, which is tilted upward to the right. It is located at the lower right end.

The pivot shaft 24 is located near the lower rear of the drive chain wheel 34 when viewed from the side.

In addition, each 82 is a chain tensioner, which is attached to the left rear arm 25, respectively.

The other configurations are the same as those of the first embodiment.

Reference numerals are given to the drawings and their explanations are omitted.

(Effects of the Invention) According to the first invention, since the cylinder of the engine is provided to protrude from the crankcase in the vehicle width direction, the engine as a whole has a horizontally long shape extending in the vehicle width direction with a low height. On the other hand, since the space below the rear of the rearwardly inclined seat back has a horizontally elongated shape, the engine can be fitted into this space to be stored.

Therefore, the front-rear dimension of the heavy body can be shortened by the amount that the engine is fitted in as described above.

On the other hand, according to the second invention, the power take-off part of the engine is provided at the front part of the side part of the engine, and the pivot parts of both rear arms relative to the vehicle body frame are located near the power take-off part in a side view. Compared to the conventional case where this was simply pivoted to the rear end of the vehicle body frame, its mounting position is moved forward. Therefore, the front-rear dimension of the vehicle body can be shortened by the amount of the forward movement while maintaining the predetermined length of both the armrests.

Furthermore, according to the above configuration, the rear wheels also move forward along with both rear arms, and these rear arms and rear wheels approach the engine, resulting in mass concentration, which is beneficial in terms of steering stability.

(Margin below)

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention, and a first embodiment of the invention is shown in FIG.
The figure is a side view, Figure 2 is a plan view, Figure 3 is a front view, Figure 4 is a partially omitted rear view, Figure 5 is a plan sectional view of the engine, and Figures 6 and 7 are the second implementation. For example, FIG. 6 is a partial side view, and FIG. 7 is a partial plan view. l...vehicle, 2...body frame, 19.front wheel, 24.
・Pivot shaft (pivot), 25...Rear arm, 29...Rear wheel, 31...Space, 32...Engine, 34...Drive chain wheel (power take-off part), 48...Crew, 49...Seat , 49
b... Seat back, 68... Crank case, 70...
·Cylinder. Diagram

Claims (1)

[Scope of Claims] 1. In a drive system for an all-terrain vehicle, in which a seat having a rearwardly inclined seat back is provided at the front and rear midpoints of a vehicle body frame, and an engine is mounted at the rear of the vehicle body frame behind the seat. . A drive device for an all-terrain vehicle, in which a cylinder of the engine projects from the crankcase in the vehicle width direction, and the engine is disposed behind and below the seat back. 2. A seat is provided in the middle of the front and back of the vehicle body frame, and an engine is attached to the rear of the vehicle body frame behind this seat, and the power take-off part of this engine is installed on the side of this engine, and the engine is installed at the rear of the vehicle body frame as above. In a drive system for an all-terrain vehicle, a pair of left and right rear arms are pivotally supported to be vertically swingable, a rear wheel is supported at the swinging end of the rear arm, and the rear wheel is operatively connected to the power take-off section. A drive system for an all-terrain vehicle in which a take-out part is provided at the front side of the engine, and the pivot parts of both rear arms relative to the vehicle body frame are located near the power take-off part when viewed from the side.