JPH0822679B2 - Crawler belt type suspension device suspension system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a suspension device for a crawler belt type traveling device.

[Prior Art] A crawler belt type traveling device in which a rubber crawler belt is hung on a drive wheel and an idler wheel and an axle support member for supporting both the drive wheel and the idler wheel is provided is Japanese Patent Publication No. 48- 41288
It is known from the Japanese Patent Publication.

[Problems to be Solved by the Invention] When the above crawler belt type traveling device is to be provided on the rear wheel side of a passenger vehicle, the axle support member thereof is required to ensure ride comfort of the vehicle and ground followability of the crawler belt. It is conceivable to support the vehicle so as to be swingable with respect to the vehicle body.

However, during sudden braking, it is possible that the braking torque of the driving wheels causes the axle support member to swing and the crawler belt to float above the ground.

Therefore, an object of the present invention is to provide a suspension device for a crawler belt type traveling device, which can suppress the lifting of the crawler belt during sudden braking while ensuring riding comfort and ground following performance.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a crawler belt on a drive wheel and an idler wheel, provides a brake device on the drive wheel, and provides a drive wheel and an idler wheel. It is characterized in that an axle support member supporting both is provided, the axle support member is suspended and supported so as to be swingable with respect to the vehicle body, and a torque rod for receiving a braking torque is provided between the drive wheel braking device side and the vehicle body side. And

[Operation] Since the axle supporting member supporting both the drive wheel and the idler wheel on which the crawler belt is suspended is swingably supported on the vehicle body, the ride comfort of the vehicle and the trackability of the crawler belt on the ground are improved. Become.

And between the brake device side of the drive wheel and the vehicle body side,
Since the torque rod that receives the braking torque is installed, the braking torque is received on the vehicle body side via the torque rod, especially during sudden braking.

Therefore, it is possible to effectively prevent the axle support member from swinging due to the braking torque, and the crawler belt from trying to float from the ground.

[Example] An example will be described below with reference to the accompanying drawings.

1 to 3 showing a configuration of a light truck type crawler belt type six-wheeled vehicle as an application example of the present invention,
1 is a vehicle body, 11 is a front wheel, 13 is a rear wheel, 15 is an idle wheel, and 17 is a crawler belt.

The vehicle body 1 is composed of a cabin 2 and a loading platform 3, and an idler wheel 15 is disposed between a front wheel 11 and a rear wheel 13 as shown in the figure, and tires 12, 14, 16 are mounted on each wheel, respectively. ing. A steering device 5 that transmits a steering force from the handle 4 in the cabin 2 to the pair of left and right front wheels 11, 11 is configured. The steering device 5 includes a steering shaft 6, a gear box 7, a steering arm 8 and a tie rod 9, and the tie rod 9 is connected to a knuckle 21 that supports a front wheel 11. Further, a front suspension 22 for independently suspending and supporting the front wheel 11 with respect to the vehicle body 1 is provided, that is, between the lower portion of the cabin 2 of the vehicle body 1 and the knuckle 21 for the front wheel, a radius rod.
Suspension components such as 23 and hydraulic damper 24 are installed.

On the other hand, an engine 25 is mounted and supported under the loading platform 3 of the vehicle body 1, and the rear wheel 13 and the idle wheel are provided on both left and right sides of the engine 25.
15 are arranged. A rear wheel drive device 26 that transmits the rotational driving force from the transmission integrated with the engine 25 to the pair of left and right rear wheels 13, 13 is configured. The rear wheel drive device 26 includes a differential device 27 at the rear of the engine 25 and a rear wheel drive shaft 28, and the rear wheel drive shaft 28 is connected to a rear wheel axle 29 supported at the rear part of the swing beam 31.

The rear wheel 13 and the idler wheel 15 in front of the rear wheel 13 are supported by the swing beam 31 forming an axle supporting member, and a rear suspension 32 is provided to support the swing beam 31 independently of the vehicle body 1. That is, the central part of the swing beam 31 is pivotally connected to a leaf spring 33 installed under the cargo bed 3 of the vehicle body 1 so as to be swingable, and hydraulic dampers 34, 35 are provided between the front and rear portions of the swing beam 31 and below the cargo bed 3. Further, a torsion-free axle beam 36 is installed between the left and right swing beams 31, 31 rear portions. In the figure, 36a is a torque canceling portion at the central portion of the axle beam 36, 37 is a stopper rubber on the central portion of the leaf spring 33, and 38 is a shackle at the rear end portion of the leaf spring 33.

Further, a rubber crawler belt 17 is mounted on the rear wheel tires 14 and the idle wheel tires 16.
Garters 19 ..., 19 ... are provided inwardly on both sides of the tread portion 18 of the 17. An eccentric hub carrier 41 is provided at the front of the swing beam 31, and the idle wheel axle 39 is supported by the hub carrier 41. The tension of the crawler belt 17 is adjusted by eccentrically rotating the hub carrier 41 that supports the idle wheel axle 39. The crawler belts 17, 17 described above are accommodated within the widthwise dimension of the vehicle body 1.

Further, a front wheel drive device 42 is configured to transmit the rotational driving force from the transmission integrated with the engine 25 to the pair of left and right front wheels 11, 11. The front wheel drive device 42 includes a propulsion shaft 43 extending forward of the engine 25, a differential device 44, and front wheel drive shafts 45, 45.
The front wheel drive shaft 45 is connected to the front wheel axle 46 supported by the knuckle 21. In the figure, 47 is a fuel tank, 48 is a battery, and 49 is a muffler.

The above crawler belt type six-wheeled vehicle has the grounding driving force by the left and right crawler belts 17,17 and the grounding driving force by the front tires 12,12, and can be used not only on general roads but also on soft ground such as farmland, sand, and snow. Excellent in running performance on rough terrain. Since the crawler belt 17 is housed within the widthwise dimension of the vehicle body 1, the crawler belt 17 does not project to the side of the vehicle body 1, and the compactness can be obtained without increasing the overall width of the vehicle, and the type certification of a light vehicle can be obtained. Further, it can be driven on a public road at a relatively high speed like a general vehicle, and can be used as a vehicle for transporting materials such as agricultural machines and fertilizers, especially by getting into agricultural fields.
In addition to suspending the front wheels 11 independently, the crawler belt 17
Since the rear wheel 13 and the idler wheel 15 on which the vehicle is hung are independently suspended, the riding comfort and the trackability of the crawler belt 17 on the ground are also excellent.

In particular, in the above embodiment, the suspension of the crawler belt type traveling device is shown in an enlarged scale in FIG. 4, the swinging structure of the left and right swing beams 31 and the relief spring 33 is shown in FIG. The 13 braking devices are as shown in FIG. 6, respectively.

First, in FIG. 5, 51 is a pivot bracket, 52 is a pivot shaft, and 53 is a pivot case. That is, the pivot bracket 51 is pivotally attached to the pivot case 53 fixed at the center of the swing beam 31 via the pivot shaft 52, and a pair of left and right bearings 5 are provided between the shaft 52 and the case 53.
A nut 55 is screwed onto the threaded portion at the tip of the shaft 52 with the interposition of 4,54. Then, in the drawing, three leaf springs 33 are stacked on the pivot bracket 51, and the central portion of the leaf spring 33 is sandwiched by a plate 56.
It is connected to the pivot bracket 51 by 7,57 and nuts 58 ...

With such a pivot structure, the swing beam 31 oscillates around the pivot center point O in the central portion, and the crawler belt 17 has individual ground followability when traveling on soft ground such as farmland or rough terrain such as sand, snow, and gravel. It has been obtained.

Further, in FIG. 6, 61 is a rear wheel braking device,
The brake device 61 includes a brake drum 63 integrated with a hub 62 fixed to the rear wheel axle 29, brake shoes 64, 64,
It is composed of a wheel cylinder 65, a return spring 66 (see FIG. 7), a back plate 67 for supporting these components, and the like. And bearing 6 on the rear axle 29
A holder 71 is attached via 8,69.
A back plate 67 is supported by 71.

In this way, the back plate 6 that supports parts such as the brake shoes 64, 64 for braking by slidingly contacting the brake drum 63.
7 is rotation-free.

By the way, in the case of sudden braking by the above crawler belt type six-wheeled vehicle, the crawler belt 17 is in a uniform grounding state as shown in FIG. As shown in FIG. 4, the swing beam 31 swings around the pivot center point O by the braking torque of the rear wheel braking device 61, and the rear portion of the crawler belt 17 floats above the ground. θ is the rising angle.

That is, in FIG. 7, h ₁ is the height O of the pivot center point, r 1
Is the tire effective radius, c is the distance between the pivot center point O and the free wheel center point, d is the distance between the pivot center point O and the rear wheel center point,
B _r is a braking force, and the moment M generated around the pivot center point O is represented by M = B _r · h ₁ .

Due to this moment M, the force (hop-up force) F _UP that pushes up the pivot center point O around the idler tire ground contact point A is It is represented by.

As shown in FIG. 8, this hop-up force F _UP decreases c (c ′) and increases h ₁ (h) as the swing beam 31 tilts so as to raise the rear part around the pivot center point O. ₂ ), so it will gradually grow.

Therefore, at the time of sudden braking, the rear part of the crawler belt 17 floats up from the ground.

Therefore, in the embodiment, as shown in FIGS. 4 and 6, the arm member 72 is connected to the rear plate brake device 61 by the back plate 67 by the bolt 73, and the arm member 72 and the pivot bracket 51 are connected to each other. A torque rod 81 is installed between them.

That is, the arm member 72 fixed to the back plate 67 is elastically coupled and supported on the outer periphery of the holder 71 by the vulcanized baking rubber 74, and the integral support piece 75 is provided on the pivot bracket 51. The torque rod 81 has a rear end 82 and a front end 83.
Is equipped with a rubber bush with pipe. Attach the torque rod rear end 82 to the upper end of the arm member 72 with bolts 76 and nuts.
Pivotally connected by 77 and torque rod front end 82
Use a similar bolt 76 to the support piece 75 on the pivot bracket 51.
And nut 77 for pivotal connection. In the figure, 78 is a washer on the nut 77 side.

Thus, in the embodiment, the pivot bracket 51 pivotally supports the swing beam 31 so as to be swingable with respect to the vehicle body 1 side, and the brake device 61 of the rear wheel 13 supported on the rear portion of the swing beam 31, that is, the back plate 67. Since the arm member 72 integrated with the
The swing beam 31 and the torque rod 81 form a four-bar link, and particularly the braking torque during sudden braking is effectively received by the torque rod 81, and the crawler belt 17 is effectively prevented from rising from the ground. It is possible.

Although the present invention is applied to a light truck in the embodiments, the present invention is also applicable to a light vehicle such as a one-box type vehicle and other types of vehicles. Further, the arrangement of the idler wheels and the rear wheels may be reversed, and the structure of the brake device is arbitrary.

[Effects of the Invention] As described above, according to the present invention, an axle support member that supports both a drive wheel and a freewheel on which a crawler belt is hung is swingably supported on a vehicle body, and a drive wheel brake is provided. Since the suspension system is constructed by installing a torque rod that receives braking torque between the device side and the vehicle body side, it is possible to improve the riding comfort of the vehicle and the trackability of the crawler belt on the ground, and especially during sudden braking. In that, by receiving the braking torque on the vehicle body side via the torque rod, it is possible to effectively suppress the crawler belt from rising from the ground due to the swing of the axle support member. It is possible to suppress changes in the posture of the vehicle body.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a crawler belt type six-wheeled vehicle as an application example of the present invention, FIG. 2 is a side view showing a drive unit and a suspension thereof, FIG. 3 is a plan view of the same, and FIG. An enlarged side view showing a suspension device of a crawler belt type traveling device according to the present invention, FIGS. 5 and 6 are cross-sectional views taken along lines VV and VI-VI in FIG. 4, and FIG. FIG. 8 and FIG. 8 are side views respectively showing the initial state of braking and the state immediately before stopping at the time of sudden braking without the torque rod according to the present invention. In the drawings, 1 is a vehicle body, 13 is a drive wheel, 15 is a freewheel, 17 is a crawler belt, 31 is an axle support member (swing arm), 51 is a pivot bracket, 52 is a pivot shaft, 61 is a brake device, 72 is an arm member and 81 is a torque rod.

Claims (1)

[Claims] 1. A crawler belt is hung on a drive wheel and an idler wheel, a brake device is provided on the drive wheel, and an axle support member for supporting both the drive wheel and the idler wheel is provided. A suspension device for a crawler belt type traveling device, characterized in that the suspension device is swingably supported with respect to, and a torque rod that receives a braking torque is installed between a drive device braking device side and a vehicle body side.