JPH0756309B2 - Wheels on rough terrain vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wheel, and more particularly to a wheel of an off-road vehicle equipped with a wide wheel rim and low-pressure tires.

b. Conventional technology Fig. 2 shows the wheels used in a four-wheel drive, all-terrain vehicle. In the figure, 1 is a low pressure tire, 2 is a wide wheel rim, 3 is a drive shaft, 4 is a universal joint, 5
Is a hub, 6 is a brake drum, 7 is an axle bearing case, 8
Is a suspension unit, 9 is a brake panel, 10 is a brake cam, and 11 is a brake shoe. The brake panel 9 is arranged outside the universal joint 4 in the left-right direction of the vehicle (right side in FIG. 2), and the brake drum 6 is also provided near the center of the wheel rim 2.

c. Problems to be Solved by the Invention Although a conventional wheel of this type is configured as described above, the central portion of the wheel rim 2 and its vicinity have a relatively small diameter, so that the brake drum 6 is The diameter was restricted to a relatively small diameter. For this reason, there is room for improvement in terms of braking performance.In particular, in recent years when the vehicle is running on rough terrain and the allowable load load is increasing, it is essential to increase the brake capacity. It was being done.

Further, in the mechanical brake device, as shown in FIG. 2, since the brake panel 9 is arranged at the inner side of the wheel rim 2, the lever 12 connected to the brake cam 10 is used.
Another problem is that it is difficult to handle the cable (not shown) connected to the lever 12, and the mechanical efficiency of the lever 12 and the cable is relatively low.

The present invention has been made in order to effectively solve the above-mentioned problems, and an object thereof is to increase the brake capacity of a drum type brake device of this type, and also to provide a lever or cable in a mechanical brake device. It is to facilitate the handling of.

The gist of the present invention is to connect an outer end portion of a drive shaft 3 having a universal joint 4 to a hub 5 of a wheel, and mount a wide wheel rim 2 and a low-pressure tire 1 on the outer periphery of the hub 5 on an rough terrain vehicle. Of the wheel, the universal joint 4 is arranged outside the inner end of the wheel rim 2, the hub 5 is rotatably supported by the outer end of the axle bearing case 7, and the inner side of the axle bearing case 7 is rotatably supported. An axle bearing case 7 is extended so that an end portion thereof substantially coincides with an inner end portion of the wheel rim 2, and the universal joint 4 is enclosed in the axle bearing case 7 to form the axle bearing case 7
A flange portion 16 is formed on the outer periphery of the inner end portion of the brake panel 17, and the brake panel 17 is attached to the flange portion 16;
A brake lever 12 for activating the brake cam 10, a brake drum 11 that supports the brake shoe 11, and is attached to the outer periphery of the hub 5 is provided inside the wheel rim 2. The wheel rim 2 includes a small-diameter portion 2b provided at substantially the center of the low-pressure tire 1 and the low-pressure tire 1.
And the large diameter portion 2a of the inner end of the wheel rim 2, the brake drum 19 has a smaller diameter portion than the small diameter portion 2b of the wheel rim 2.
19b and a large diameter portion 19a having a diameter larger than the small diameter portion 2b of the wheel rim 2, the small diameter portion 19b of the brake drum 19 is disposed in the small diameter portion 2b of the wheel rim 2, and the wheel rim 2 Inside the large diameter part 2a of the brake drum 19
19a is provided, and the brake shoe 11 can be pressed into contact with the inner circumference of the large-diameter portion 19a of the brake drum 19, which is a wheel of an off-road vehicle.

d. Means for Solving the Problems One embodiment of the present invention will be described below with reference to FIG.
As shown in the figure, in the wheel according to the present invention, the wheel rim 2
Holds the low-pressure tire 1 from the inside and the outside between the inner wheel rim 2A and the outer wheel rim 2B.
The inner end portion of the wheel rim is extended to the inner end portion of the wheel rim 2 to form a flange portion 16, and a brake panel 17 is attached to the flange portion 16 with a bolt 18. In this embodiment, the brake panel 17 is made of steel plate press, but it is also possible to integrally cast the axle bearing case 7, the flange portion 16 and the brake panel 17 with a high strength aluminum alloy casting or the like. Cost reduction can be achieved by reducing the number of parts. The axle bearing case 7 is bolted to a suspension arm (not shown) with a flange or the like.

On the other hand, the outer end of the brake drum 19 is fastened to the hub 5 and the wheel rim 2 together by a bolt 20 and is directly connected to the drive shaft 3. Further, the inner end of the brake drum 19 is extended along the inner peripheral surface of the wheel rim 2 to the large diameter portion 2a of the inner end of the wheel rim 2, and the lining 21 is cast on the inner peripheral surface of this extended portion. Have been stuck.

Further, the wheel rim 2 has a small diameter portion 2b at the center of the low pressure tire 1 and a large diameter portion 2a at the inner end of the low pressure tire 1. Also,
The brake drum 19 has a small diameter portion 19b having a smaller diameter than the small diameter portion 2b of the wheel rim and a large diameter portion 19a having a larger diameter than the small diameter portion 2b of the wheel rim. The small diameter portion 19b of the brake drum is arranged inside the small diameter portion 2b of the wheel rim, and the large diameter portion 19a of the brake drum is arranged inside the large diameter portion 2a of the wheel rim. Therefore, the lining 21 is arranged on the large diameter portion 19a of the brake drum.

A ring-shaped draining plate 22 having a diameter equal to or larger than that of the inner large-diameter end portion 2a of the wheel rim 2 is provided on the outer peripheral portion of the brake panel 17.
Is installed. A small gap c is formed between the water draining plate 22 and the wheel rim 2, and even if muddy water or the like jumped up by a wheel enters the gap c, the muddy water is caused by the labyrinth action and the slinger action in the gap c. Is configured to be discharged to the outside.

Further, according to the present invention, the hub 5 is rotatably supported by the outer end portion of the axle bearing case 7, and the inner end portion of the axle bearing case 7 is substantially aligned with the inner end portion of the wheel rim 2 so that the axle bearing case is formed. 7 are extended. The universal joint 4 is arranged outside the inner end of the wheel rim 2.

Therefore, the universal joint 4 is enclosed in the axle bearing case 7.

In addition, a flange portion is provided on the outer periphery of the inner end of the axle bearing case 7.
16 is formed, the brake panel 17 is attached to the flange portion 16, the brake lever 12 for operating the brake cam 10 is arranged on the brake panel 17, and the brake shoe is provided.
Supports 11.

In FIG. 1, the same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

e. Action The wheel of the present invention is constructed as described above, and when the lever 12 is moved to actuate the brake cam 10, the brake shoe 11 presses against the lining 21 of the brake drum 19 so that the brake works. At this time, since the brake drum 19 and the lining 21 have a relatively large diameter, a large braking force can be obtained. Further, since the brake drum 19 is large, its heat capacity is large, and it is possible to solve the shortage of heat capacity, which is likely to cause a problem in a so-called semi-sealed brake device for vehicles on rough terrain. In addition, the brake drum 19
Since a relatively large space is formed inside, effective convection cooling of the brake shoe 11, the lining 21, etc. is performed, and the braking performance is further stabilized.

f. Effects of the Invention As described above, according to the present invention, the small diameter portion and the large diameter portion of the brake drum are arranged in the small diameter portion and the large diameter portion of the wheel rim, respectively. Therefore, it is possible to increase the braking force, and it is possible to dispose the brake drum that does not cause insufficient strength even if the braking force is increased.

In addition, the increase in the size of the brake drum increases its heat capacity, and it is possible to solve the shortage of heat capacity, which tends to be a problem in so-called semi-sealed brake devices.

Furthermore, since a relatively large space is formed in the brake drum, effective convection cooling of the brake device is achieved,
The braking performance can be further stabilized.

Also, since the brake panel is located at the inner end of the wheel rim, it is possible to simplify the routing of the brake cam actuating lever and cable, and improve its mechanical efficiency and durability. In addition to being able to do so, it is possible to achieve weight reduction and cost reduction.

Also, since the brake panel is located at the inner edge of the wheel rim, the shape of the inner edge of the wheel rim is used to easily place the draining plate facing this edge on the edge of the brake panel. It can be installed, and it is extremely easy to prevent the intrusion of muddy water between the wheel rim and the brake drum.

Moreover, in a so-called independent suspension wheel driven by a drive shaft having a universal joint, and
In a wheel of an off-road vehicle equipped with a wide wheel rim and a low-pressure tire, the universal joint is enclosed in the axle bearing case, so that the universal joint can be protected by the axle bearing case.

Moreover, the axle bearing case is extended so that the inner end portion of the axle bearing case substantially coincides with the inner end portion of the wheel rim, the brake panel of the flange portion of the inner end portion is attached, and the brake panel is attached to the brake panel. Since the brake lever for activating the brake cam is provided, it is possible to allow a margin in the operation angle of the brake lever at a position inside the axle bearing case having a relatively large diameter.

[Brief description of drawings]

 FIG. 1 is a vertical sectional view of a wheel according to the present invention, and FIG. 2 is a vertical sectional view of a conventional wheel. 1 …… Low pressure tire, 2 …… Wheel rim, 7 …… Axle bearing case, 11 …… Brake shoe, 17 …… Brake panel, 19 …… Brake drum.

Claims (1)

[Claims] 1. A rough terrain vehicle in which an outer end of a drive shaft 3 having a universal joint 4 is connected to a hub 5 of a wheel, and a wide wheel rim 2 and a low-pressure tire 1 are attached to the outer periphery of the hub 5. In the wheel, the universal joint 4 is arranged outside the inner end of the wheel rim 2, the hub 5 is rotatably supported by the outer end of the axle bearing case 7, and the inner side of the axle bearing case 7 is rotatably supported. An axle bearing case 7 is extended so that an end portion thereof substantially coincides with an inner end portion of the wheel rim 2, the universal joint 4 is surrounded in the axle bearing case 7, and an inner end portion of the axle bearing case 7 is surrounded. The flange portion 16 is formed on the outer periphery of the
The brake panel 17 is attached to the
A brake lever 12 for activating the brake cam 10 is provided, a brake shoe 11 is supported, and a brake drum 19 attached to the outer periphery of the hub 5 is provided inside the wheel rim 2. 2 is formed from a small diameter portion 2b provided in the center of the low pressure tire 1 and a large diameter portion 2a at the inner end of the low pressure tire 1.
Is a small diameter portion 19b having a smaller diameter than the small diameter portion 2b of the wheel rim 2.
And a large-diameter portion 19 having a larger diameter than the small-diameter portion 2b of the wheel rim 2.
and a small diameter portion 19b of the brake drum 19 is arranged in the small diameter portion 2b of the wheel rim 2 and a large diameter portion 19a of the brake drum 19 is arranged in the large diameter portion 2a of the wheel rim 2.
And the brake shoe 11 is connected to the brake drum.
A wheel for an all-terrain vehicle, which is capable of being pressed against the inner circumference of the large diameter portion 19a of 19.