JPH0365296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle brake system that facilitates the removal of a brake panel of a brake system attached to an axle and facilitates maintenance of the brake system.

Conventionally, most vehicle brake devices that are attached to the axle are fastened to the axle by a nut screwed into a male threaded part of the axle, and such brake devices require maintenance and repair such as replacing the brake shoe. When doing this, the brake panel cannot be removed unless the axle nut is removed, making maintenance and repair work extremely troublesome.

In view of the above, the present invention aims to facilitate maintenance and repair of the rear brake attached to the rear axle of a vehicle, particularly a three-wheeled buggy, and includes a brake drum that rotates integrally with the axle, and a brake drum that applies braking force to the brake drum. In a vehicle brake system, the brake system is fastened to the axle by an axle nut screwed into the axle. The brake panel of the brake device is supported by a collar fitted to the axle, the outer diameter of the collar is made slightly larger than the outer diameter of the axle nut, and the brake panel and the drum cover are joined with bolts, To provide a brake device for a vehicle in which a brake panel can be removed without removing an axle nut, and maintenance and repair of the brake device are extremely easy.

The present invention will be described in detail below based on illustrated embodiments.
FIG. 1 shows an external view of a three-wheeled buggy to which the present invention is applied. In front of a body frame 1, a front wheel 2 is cushioned and supported by a front fork 4 fixed to a handlebar 3 via a front suspension 5. A pair of left and right rear wheels 6 are connected to a rear axle (FIGS. 2 and below) 18, which will be described later, and are rigidly supported by the vehicle body frame 1 at the rear of the vehicle. Furthermore, the front wheels 2 and rear wheels 6 use low-pressure balloon tires.
It is designed to be suitable for driving on rough terrain such as wasteland, farmland, and snowy roads. A fuel tank 7 is provided at the front of the upper part of the vehicle body frame 1, and a seat 8 is disposed behind the fuel tank 7. An engine 9 is mounted below the fuel tank 7 with its crankshaft (not shown) facing left and right of the vehicle body. There is. A transmission gear (not shown) is housed in a transmission case 11 formed integrally with a crankcase 10 of the engine 9, and rotation of the crankshaft is transmitted via the transmission gear to an output shaft 12 (see Fig. 2) parallel to the crankshaft. Reportedly.

2 and 3 show details of the drive system and brake system of the vehicle, in which a propeller shaft 13 is housed in a propeller shaft case 14 and is disposed approximately on the center line in the longitudinal direction of the vehicle body, and the output shaft 1
2 and the propeller shaft 13 are orthogonally transmitted by bevel gears 15 and 16 meshing at each shaft end. A universal joint 13a and a buffer joint 13b for mitigating the impact of sudden torque fluctuations are incorporated into the propeller shaft 13, and a drive side bevel gear 17a is attached to the rear shaft end, and the drive side bevel gear 17b is integrated with the rear axle 18. A final gear device 17 is configured by meshing with a driven bevel gear 17b that rotates.

The rear axle 18 fixes the rear wheels 6 at both ends, and
A stopper portion 19 is formed integrally with the rear axle 18 at a predetermined position, and a spline 2 is formed over a predetermined length.
0 is engraved. And this spline 20
A first collar 21 having a predetermined length is fitted with one end in contact with the stopper portion 19. 1st
A driven side bevel gear 17b of the final gear device 17 is fitted on the outer periphery of the collar 21 with a spline 21a so that it can rotate integrally with the rear axle 18.
Further, the first collar 2 rotates through the bearings 23, 24 and the seal members 25, 26, in which the final gear case 22 housing the final gear device 17 is rotated.
1 and supported so as to be stationary.

A first collar 2 is attached to the spline 20 of the rear axle 18.
1, a second collar 27 and a third collar 28 having a predetermined length are connected and fitted together, and the second collar 2
A brake drum 31 is rotatably fitted to the outer periphery of the third collar 28 and a brake panel 32 is rotatably fitted to the outer periphery of the third collar 28 via a bearing 34 and a seal member 35.
8, it is supported so as to be stationary. On the other hand, on the first collar 21 side, a drum cover 33 is supported so as to be stationary with respect to the first collar 21 via a seal member 36, and the brake panel 32 and drum cover 33 accommodate the brake drum 31 inside, and a gasket is attached at the periphery. 37 and are joined with a plurality of bolts 38 to constitute a brake device 30. As shown in detail in FIG. 4, the brake device 30 has a pair of arcuate brake shoes 30b, 30b pivoted to a pin 30a installed on the inner surface of a brake panel 32. A friction member 30d, which is biased toward each other by two springs 30c and 30c and is attached to the outer circumference of the brake shoe 30b, is spaced apart from the inner circumference of the brake drum 31. Both brake shoes 30
A rectangular cam 30e provided on the brake panel 32 side is arranged at the free ends of b and 30b, and by rotating the brake lever 30g at the tip of the cam shaft 30f that passes through the brake panel 32 to the outside, the rectangular cam 30e is arranged. The cam 30e is connected to both brake shoes 30b.
is expanded to press the friction member 30d of the brake shoe 30b against the inner periphery of the brake drum 31 to generate braking force.

Final gear case 22 and drum cover 33
The final gear device 17 and the brake device 30 are connected to the rear axle 18 by connecting the mutually protruding boss portions 22a and 33a and fastening them together with a plurality of bolts 39 (only one location is shown in the figure). A washer 41 is attached to the male threaded portion 40 carved in a predetermined position.
By tightening the axle nut 42 through the axle nut 42, the axle nut 42 is positioned and fixed between the stopper part 19 and the axle nut 42. Note that the axle nut 42 is a double nut to prevent loosening. Here, in the present invention, the brake panel 32 of the brake device 30
The outer diameter D of the third collar 28 supporting the axle nut 42 is slightly larger than the outer diameter d of the axle nut 42.

At both ends of the spline 20 of the rear axle 18 are first
O-ring 4 between collar 21 and third collar 23
3 and 44, respectively, to prevent dust, water, etc. from entering the spline 20.

In the three-wheel buggy vehicle having the above configuration, the engine 9
The rotation of the output shaft 12 is transmitted to the output shaft 12 via the transmission gear, and the rotation of the output shaft 12 is transmitted to the bevel gear 15,1.
The rotation of the propeller shaft 13 is transmitted to the rear axle 18 through the meshing of the final gear device 17, thereby driving the rear wheels 6. . Although the rear wheel 6 is not supported by a spring, the engine 9 and the rear axle 18 may be affected by the bending of the frame or the like.
The relative displacement between the propeller shaft 13 is handled by the universal joint 13a of the propeller shaft 13, and sudden torque fluctuations caused by changes in ground resistance of the rear wheels 6 are absorbed by the buffer joint 13b. Differences in the trajectories of the left and right rear wheels 6 during turning can be handled by the flexibility of the balloon tires.

When removing the brake panel 32 for maintenance or repair of the brake device 30 such as replacing the brake shoe 30b, remove the bolts 38 that connect the drum cover 33 and the brake panel 32, and the brake panel can be removed from the bearing 30. It can be extracted along the circumferential surface of the third collar 28 along with the dust seal 35. At this time, since the outer diameter D of the third collar 28 is slightly larger than the outer diameter of the axle nut 42, the axle nut 42 can be removed. While tightening the brake panel 32, attach it to the drum cover 3.
3, maintenance of the inside of the brake device 30,
Repairs can be made.

The present invention described above is not limited to a brake device for the rear axle of a three-wheeled buggy, but also applies to a brake device consisting of a brake drum, a brake panel, and a drum cover that is fastened to the axle by an axle nut screwed into the axle. Needless to say, it can be widely applied to vehicle brake devices.

As explained above, according to the present invention, there is provided a brake drum that rotates integrally with an axle, a brake panel that includes a braking member that applies braking force to the brake drum, and a drum cover that is joined to the brake panel and covers the brake drum. In a vehicle brake system, the brake panel of the brake system is supported by a collar fitted to the axle, and the outer diameter of the collar is By making the diameter of the nut slightly larger than the outer diameter of the axle nut and joining the brake panel and the drum cover with bolts, the drum cover and the brake panel are joined without removing the threaded member of the axle. The brake panel can be separated from the drum cover along the circumferential surface of the collar by simply removing the bolts, making maintenance and repair of the interior of the brake device extremely easy.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an external view of a three-wheeled buggy to which the present invention is applied, FIGS. 2 and 3 are sectional views of the drive system and brake device of the same vehicle, and FIG. 4 3 is a sectional view taken along the line - in FIG. 3. FIG. 18... Rear axle, 28... Third collar, 30... Brake device, 31... Brake drum, 32... Brake panel, 33... Drum cover, 40... Male threaded portion, 42... Axle nut.

Claims (1)

[Claims] 1 A brake device consisting of a brake drum that rotates together with the axle, a brake panel equipped with a braking member that applies braking force to the brake drum, and a drum cover that is joined to the brake panel and covers the brake drum is screwed onto the axle. In a vehicle brake device that is fastened to an axle by an axle nut, the brake panel of the brake device is supported by a collar fitted to the axle, and the outside diameter of the collar is slightly larger than the outside diameter of the axle nut. A brake device for a vehicle, characterized in that the brake panel and the drum cover are joined with bolts.