JPH0242536Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a brake device for a vehicle, and more particularly to a structure of a brake device with improved sealing performance.

(Technical background of the invention) It is desirable that a brake device for a vehicle has good sealing properties to prevent dust from entering the device and to suppress the progress of wear of the brake pads caused by the dust. Particularly for vehicles such as buggies that travel on rough terrain under harsh conditions, it is desirable to improve the sealing performance of the brake device to prevent wear of the brake pads caused by dust and to improve puncture resistance.

(Purpose of the invention) The present invention was made in view of the above points, and aims to improve the sealing performance of the brake device, prevent wear of the brake pads caused by dust, and thereby improve the durability of the brake device. It is an object of the present invention to provide a brake device for a vehicle in which the number of support points of bearings supporting the brake device is reduced.

(Summary of the invention) In order to achieve the above object, the present invention includes two left and right rear wheels driven by a shaft drive mechanism, and the rear wheels are connected to the final gear case of the shaft drive mechanism and the brake device through a collar and a bearing. In a vehicle brake device rotatably supported by brake cases, the brake case includes a brake panel located on the end side of the rear axle and the inner side thereof, in order to house a brake drum that rotates integrally with the rear axle. and a drum cover located at the final gear case, and the drum cover is connected to the final gear case,
A sealing member is interposed at a joint portion between the brake panel and the drum cover, and at each rotating portion between the brake panel, the drum cover, and the collar, and further, the brake case is connected to the brake panel. The drum cover is supported in a cantilever manner by a bearing interposed between one of the drum covers and the collar.

(Example of idea) The present invention will be described in detail below based on illustrated embodiments.

FIG. 1 shows the appearance 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 18 (see FIGS. 2 and 3), which will be described later, and are rigidly supported by the vehicle body frame 1 at the rear of the vehicle.
Note that the tires for the front wheels 2 and rear wheels 6 are low-pressure balloon tires, which are suitable for driving on rough terrain such as rough terrain, farmland, and snowy roads. A fuel tank 7 is disposed 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 a 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 that is integrally formed with the crank chamber 10 of the engine 9, and the rotation of the crankshaft is transmitted via the transmission gear to an output shaft 12 (see FIG. 2) parallel to the crankshaft. (see).

2 and 3 show details of the drive system of the vehicle, in which a propeller shaft 13 forming a shaft drive mechanism is disposed approximately on the center line in the longitudinal direction of the vehicle body, housed within a propeller shaft case 14,
The output shaft 12 and the propeller shaft 13 are orthogonally transmitted by bevel gears 15 and 16 meshing at each shaft end. The propeller shaft 13 incorporates a universal joint 13a and a buffer joint 13b that cushions the impact of sudden torque fluctuations, and a drive-side bevel gear 17a is attached to the rear shaft end, and the drive-side bevel gear 17a 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 spline 21a is formed on the outer periphery of the collar 21, and a driven side bevel gear 17b of the final gear device 17 is fitted into this spline 21a. It is rotatable together with the rear axle 18 via the rear axle 18. One end of the rear axle 18 accommodates the final gear device 17 and is rotatably supported by a final gear case 22 fixed to the vehicle body via bearings 23, 24 and seal members 25, 26.

A first collar 2 is attached to the spline 20 of the rear axle 18.
A second collar 27 and a third collar 28 having a predetermined length are connected to and connected to the spline 2.
O-rings 43 and 44 are fitted between the first collar 21 and the third collar 28 at both ends of the spline 20 to prevent dust and the like from entering the spline 20.

A brake case of a brake device 30 fixed to the vehicle body is disposed on the other end side of the rear axle 18. This brake case is press-fitted into the second collar 27 and includes a brake panel 32 located on the rear side of the rear axle 18 to accommodate a brake drum 31 that rotates together with the rear axle 18 via the collar 27. and a drum cover 33 located inside the drum cover 33 are connected at their peripheral edges with a plurality of bolts 38 via a packing 37. The drum cover 33 and the final gear case 22
The boss portions 22a and 33a facing each other are joined together and integrally connected with a plurality of bolts 39.

A seal member 36 is provided at the rotating portion between the inner circumferential surface of the drum cover 33 and the first collar 21, and a seal member is provided at the rotating portion between the inner circumferential surface of the brake panel 32 and the third collar 28. A member 35 is interposed respectively. Furthermore, inside the seal member 35, the inner peripheral surface of the brake panel 32 and the third collar 2
A bearing 34 is interposed between the bearing 8 and the bearing 8. In this way, the brake case is supported in a cantilever manner on the rear axle 18 by the bearing 34 on the inner peripheral surface of the brake panel 32, so that the other end of the rear axle 18 is supported by the bearing 34. It is rotatably supported on the brake case via.

As shown in detail in FIG. 4, the brake device 30 has a pair of circular brake shoes 30 attached to pins 30a implanted on the inner surface of a brake panel 32.
b, 30b are pivotally supported, and both brake shoes 30
b and 30b are biased toward each other by two springs 30c and 30c, and the outer circumferential surface of the friction member 30d attached to the outer circumference of the brake shoe 30b is slightly separated from the inner circumferential surface of the brake drum 31. ing.

A rectangular cam 30e provided on the brake panel 32 side is arranged at the free end of both brake shoes 30b, 30b, and the brake lever 30 at the tip of a cam shaft 30f that passes through the brake panel 32 to the outside.
By rotating g, the rectangular cam 30e
The brake shoes 30b, 30b are expanded to bring the friction members 30d, 30d of each brake shoe 30b, 30b into pressure contact with the inner peripheral surface of the brake drum 31, thereby generating a braking force.

As described above, this brake device 30 has a gasket 37 made of a rubber sheet or the like for the connecting portion between the brake panel 32 and the drum cover 33, and a sealing member for the rotating portion between the inner peripheral surface of the brake panel 32 and the third collar 28. 35, the rotating part between the inner peripheral surface of the drum cover 33 and the first collar 21 is sealed by the sealing member 3
6. The space between the rear axle 18 and the third collar 28 is sealed with O-rings 44 at four locations in total. The seal members 35 and 36 each have a flange 35 on the outer end surface.
a, 36a are formed to cover the shaft holes of the brake panel 32 and drum cover 33, so that the sealing performance is further improved.

The final gear device 17 and the brake device 30 are connected to a predetermined position 17 of the rear axle 18 and the brake device 30 are fastened to an axle nut 42 via a washer 41 to a male threaded portion 40 carved at a predetermined position of the rear axle 18. By doing so, the stopper part 19
and the axle nut 42. Note that the axle nut 42 is a double nut to prevent loosening.

In the three-wheel buggy vehicle having the above configuration, the rotation of the engine 9 rotates the output shaft 12 via the transmission gear, and the rotation of the output shaft 12 is transmitted through the bevel gears 15 and 16.
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.

When braking, when the brake lever 30g is operated via a rod (not shown), the cam 30
e rotates and the pair of brake shoes 30b,
In order to push and spread the free ends of the brake shoes 30b, the friction members 30d of the brake shoes 30b, 30b come into pressure contact with the inner peripheral surface of the brake drum 31, and this braking force generates a braking force on the rear wheel 6 together with the rear axle 18.

During such driving, the brake device 30 is sealed by the seal members 35, 36 and the gasket 37, so that dust and the like are prevented from entering the brake device even when driving on rough roads such as rough terrain. Ru. Also, the O-ring 44 is connected to the rear axle 1.
8 and the third collar 28 which is spline-fitted thereto and rotates together,
There is little wear on the O-ring 44.

The final gear case 22 also has a brake device 30.
Similarly, the final gear case 22 is sealed by the seal parts 25, 26 and the O-ring 44.
This prevents dust, etc., from entering the inside.

The brake case of the brake device 30 is supported by a cantilever on the inner peripheral surface of the brake panel 32 on the other end side of the rear axle 18 by means of a bearing 34, but the drum cover 33 is supported by a bearing on one end side of the rear axle 18. Since it is integrally connected to the final gear case 22 supported by 23 and 24,
The brake case can be supported with sufficient rigidity, and the number of support points for bearings that support the brake case can be reduced. Note that instead of providing the bearing 34 on the brake panel 32 side, it may be interposed between the drum cover 33 and the first collar 21.

(Effects of the invention) As explained above, according to the invention, there are two left and right rear wheels driven by a shaft drive mechanism, and the rear axle is connected to the final gear case of the shaft drive mechanism and the brake device through a collar and a bearing. In a vehicle brake device rotatably supported by brake cases, the brake case includes a brake panel located on the end side of the rear axle and the inner side thereof, in order to house a brake drum that rotates integrally with the rear axle. and a drum cover located at the final gear case, and the drum cover is connected to the final gear case,
A sealing member is interposed at a joint portion between the brake panel and the drum cover, and at each rotating portion between the brake panel, the drum cover, and the collar, and further, the brake case is connected to the brake panel. The structure in which the drum cover is cantilevered by a bearing interposed between either one of the drum covers and the collar can improve the sealing performance of the brake device, and prevent leakage into the brake device. It is possible to prevent the intrusion of dust, and as a result, it is possible to suppress the wear of the brake pads caused by the dust, and it is possible to improve the durability of the brake device, as well as to reduce the wear of the bearings that support the brake device. The number of support points can be reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an external view of a three-wheeled buggy to which the present invention is applied; Figs. 2 and 3 are cross-sectional views of the drive system and brake device of the vehicle; and Fig. 4. is a sectional view taken along the line - in FIG. 3; 6... Rear wheel, 18... Rear axle, 21, 27, 2
8... Collar, 23, 24, 34... Bearing, 30... Brake device, 31... Brake drum, 32... Brake panel, 33... Drum cover, 35, 36... Seal portion, 37... Packing .

Claims (1)

[Scope of utility model registration request] A brake device for a vehicle is equipped with two left and right rear wheels driven by a shaft drive mechanism, and a rear axle is rotatably supported by a final gear case of the shaft drive mechanism and a brake case of the brake device, respectively, via a collar and a bearing,
The brake case is made up of a brake panel located at the end of the rear axle and a drum cover located inside the brake panel, which are combined to accommodate a brake drum that rotates together with the rear axle. The sealing member is connected to the final gear case, and a sealing member is interposed at a joint portion between the brake panel and the drum cover, and at each rotating portion between the brake panel, the drum cover, and the collar, and further . A brake device for a vehicle, wherein the brake case is cantilever-supported by a bearing interposed between either the brake panel or the drum cover and the collar.