JPS585834B2 - Suspension device for vehicles traveling on rough terrain - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension system for an off-road vehicle that allows stable running even on rough terrain with severe ups and downs.

Conventionally, as a vehicle that can travel on rough terrain with severe ups and downs,
2. Description of the Related Art There is a known all-terrain vehicle in which the front, rear, left, and right suspension parts can be moved up and down using four independent hydraulic cylinders.

However, all-terrain vehicles that use the four hydraulic cylinders mentioned above to raise and lower the suspension to control the vehicle's attitude are generally expensive because the control circuit that controls each hydraulic cylinder according to the height difference of the undulations is complex. There is a drawback.

This invention was made for the purpose of eliminating such drawbacks, and it is possible to maintain the vehicle body in a stable position at all times by simply operating one or two hydraulic cylinders simultaneously depending on the ups and downs of the running road. To provide a suspension device for a vehicle traveling on rough terrain, which enables stable travel even on rough terrain with severe ups and downs.

The present invention will be described in detail below with reference to an illustrated embodiment.

In the figure, reference numeral 1 denotes a vehicle body of an all-terrain vehicle, which has a framework structure in which the front and rear ends of side frames 1a spaced apart in the vehicle width direction are connected to each other by front and rear members 1b.

A side frame 1 is located slightly in front of the center of the vehicle body 1.
A driver's cab support part 1c is provided to protrude upward from point a, and the bottom of the driver's cab 3 is supported by a pin 2 on the top of this support part 1c so as to be swingable in the front and rear directions around the pin 2. There is.

The driver's cab 3 has a box shape with entrances and exits 3a on both sides, and a seat 4 and a control device (not shown) are installed inside.

Further, below the driver's cab 3, there is provided a substantially L-shaped bell crank 6 which is located inside the support portion 1c and whose bent portion is rotatably supported on the side frame 1a by a pin 5. .

The lower end of a link 8 whose upper end is pivotally connected to the bottom of the driver's cab 3 by a pin 7 is pivotally connected to the horizontal end of each bell crank 6 by a pin 9, thereby interlocking the driver's cab 3 and the bell crank 6. At the same time, above the bent portion of the bell crank 6, the tip of the piston rod 10a of the fluid pressure cylinder 10, which is pivotally connected to the side frame 1a of the vehicle body 1 at the base end, is attached to a pin 11.
It is pivoted by.

Further, one end of a link 13 is pivotally attached to the upper end of the vertical part of the bell crank 6 by a pin 12, and the other end of the link 13 is attached by a pin 15 to the side surface of an engine compartment 14 that is movable in the longitudinal direction of the vehicle body 1. It is pivoted.

A plurality of rollers 16 are supported at both sides of the lower part of the engine chamber 14 and spaced apart from each other in the front and rear direction.

These rollers 16 are laid inside the side frame 1a of the vehicle body 1, and are fitted into channel-shaped guide rails 17, so that the engine compartment 14 is moved along the guide rails 17 to the vehicle body 1.
A power engine 18 that can be operated from inside the driver's cab 3 and a hydraulic pump 19 driven by the engine 18 are housed in the engine compartment 14 so as to be movable in the front-back direction.

The hydraulic pressure discharged from the hydraulic pump 19 rotates independent left and right traveling hydraulic motors 21 provided on the suspension 20.

On the other hand, the suspension 20 has a parallel link 23 whose central portion is pivotally connected to the front and rear members 1b provided at the front and rear ends of the vehicle body 1 by a pin 22.

The tip of a piston rod 40a of an attitude control cape cylinder 40 is pivotally attached to the side of the central part of the parallel link 23 located on the lower side of these parallel links 23, and the base end of the attitude control cylinder 40 is connected to the vehicle body 1. It is pivotally connected to a bracket 1f that projects from the front and rear end members 1b.

Further, at both ends of the valley parallel link 23, there are bracket portions 2 located at the front and rear of the swing frame 24 provided on both sides of the vehicle body 1.
4a is pivotally attached via a pin 25.

A track frame 28 is provided on the outer surface of these swing frames 24, with one side fixed to the swing frame 24 and the other central part pivotally connected to the swing frame 24 by a pin 26. The left and right traveling hydraulic motors 21 are installed in the center of the vehicle to rotate a sprocket 29 supported on a track frame 28.

Endless chains 30 are wound around these sprockets 29, and these chains 30 transmit the rotation of the hydraulic motor 21 to sprockets 31 supported on the upper front and rear ends of the track frame 28. At the same time, a starting wheel 32 is provided coaxially with the sprocket 31.

Also, diagonally below each starting wheel 32, two rolling wheels 33 are supported on the lower part of the truck frame 28 for each starting wheel 32 so as to be located at each corner of a triangle with the starting wheel 32 as the apex. A crocodile-shaped endless crawler belt 34 is wound between these wheels 33 and the starting wheel 32.

These crawler belts 34 have a structure in which a large number of links +34a are connected endlessly by pins 34b, and grouser 34c is attached to the outer surface.
A track plate 34d having a protruding structure is fixed to each link 34a, and the flange 33a of the track wheel 33 is engaged with the link 34a located on both inner sides of each track plate 34d.
4 and supports the load of the vehicle body 1.

Note that the vehicle body 1 is provided with a stopper (not shown).
The rotation range of each parallel link 23 is restricted, thereby preventing the suspension 20 from swinging more than necessary.

Further, 35 is a working winch that is attached to the vehicle body 1 as necessary, 36 is a fuel tank, and 37 is a hydraulic oil tank.

Thus, the hydraulic pump 19 rotated by the engine 18
The hydraulic pressure discharged from the drive motor 21 is supplied to the traveling motor 21, which rotates the sprocket 29 that is linked to the motor.
The error is transmitted to the 0 sprocket 31.

Since the sprocket 31 is coaxial with the starting wheel 32, the starting wheel 32 rotates the crawler track 34, and the vehicle body 1
run.

Further, the vehicle body 1 can freely turn by rotating the crawler track 34 on the opposite side while braking the undercarriage 20 in the turning direction with a brake (not shown), and it can also be easily reversed by simply reversing the traveling hydraulic motor 21. can be done.

Next, when one of the suspensions 20 rides over an undulation or an obstacle when traveling on rough terrain, first the front suspension 20 runs over the undulations, etc., and at the same time, the attitude control cylinder 40 is expanded and contracted, and the parallel link 28 is tilted around the central bin 22 as shown by diagonal lines in FIG.

At the same time, the front end side of one of the truck frames 28, which pivots the center part, rotates upward according to the height of the raised shape or obstacle, so only the suspension 20 that rides on the raised shape moves upward, and the vehicle body 1 Since it is maintained horizontally in both the longitudinal and lateral directions, the attitude of the vehicle body 1 does not change suddenly even after the suspension 20 has overcome undulations or obstacles.

Also, when the vehicle body 1 travels along a slope in the contour line direction, by controlling the attitude of the suspension 20 on the mountain side to be high and the valley side low, it is possible to proceed on the slope while keeping the vehicle body 1 horizontal.
Since the attitude control cylinder 40 only needs to be operated at the same time, no more complicated control circuit is required than in the conventional system in which the suspension 20 is controlled individually.

Moreover, since the edge portion of the crawler belt 34 bites into the inclined surface, the risk of skidding is also reduced.

Note that the suspension 20 may be made of wheels. As described in detail above, in this invention, a truck frame is fixed to one side of a swinging frame that is swingably supported on both sides of a vehicle body via parallel links, and the other truck frame is pivoted at its center to the swinging frame. The support allows for free rotation in the front and rear directions, which allows the vehicle body to remain horizontal when driving on slopes, enabling stable driving, and also cooperates with the swinging of the swinging frame when climbing over undulations or obstacles. Since one side of the truck frame also rotates in the front and rear directions, the vehicle body does not move suddenly.
You will be able to safely overcome these ups and downs and obstacles.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view, FIG. 2 is a partially cutaway rear view, FIG. 3 is a detailed view of the shoe body, and FIG. 4 is a plan view. 1 is a vehicle body, 18 is an engine, 21 is a rotational drive source 23 is a parallel link, 24 is a swinging frame, 28 is a truck frame, 32 is a starting wheel, 33 is a rolling wheel, and 34 is a crawler track.

Claims (1)

[Claims] 1. At least two sets of parallel links 23 whose center portions are supported by the vehicle body 1 are provided spaced apart in the front-rear direction on the vehicle body 1 on which the power engine 18 is mounted, and a swing frame 24 is provided between both ends of these parallel links 23. one of the track frames 28 is fixed to one of the swing frames 24, and the other track frame 28 has its center portion pivotally supported on the swing frame 24 so that it can freely rotate in the front and rear direction. In addition, a starting wheel 32 driven by left and right independent rotational drive sources 21 is provided at the front and rear ends of each track frame 28, and a plurality of wheels 33 are provided in the vicinity of the starting wheel 32. This is a suspension device for an all-terrain vehicle in which an endless crawler track 34 is wrapped around a 32-wheel roller 33.