JPH027760Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure around the rear axle of a shaft drive type three-wheeled or four-wheeled motor vehicle.

BACKGROUND OF THE INVENTION Automobile tricycles equipped with ultra-low pressure tires called balloon tires and having one front wheel and two rear wheels are in practical use for driving off-road on sand, gravel, grassland, wasteland, mud, etc.

Conventionally, most of such tricycles have adopted a chain and sprocket mechanism, but it is planned to adopt a shaft drive mechanism instead.
By the way, the shaft drive type is equipped with a gear case to protect the final gear mechanism, and on the other hand, the axle must be rotatably supported on the frame side as a drive shaft, and on the other hand, the axle must be equipped with a brake device for braking. However, if these support structures and the like are provided individually, there is a risk that the structure will be complicated, the number of parts will increase, the assembly work will be complicated, and there will be disadvantages in maintenance. In addition, since this type of tricycle travels on muddy areas, it is necessary to make each part waterproof and dustproof. If each part was independent and provided with a sealing mechanism, the number of parts would increase, the structure would become complicated, and the assembly would be difficult. This leads to complicated attachment work.

The present invention was devised in view of the above, and its purpose is to integrally form case halves at both axial ends of a support member that inserts and supports a rear axle into the vehicle body, and to covering each outer side in the axial direction with a cover and forming it on both axial ends of the support member of the sealed case,
One of the sealed cases is used as the final gear case of the shaft drive mechanism, and the other is used as the brake case, simplifying the structure around the rear axle, reducing the number of parts, rationalizing the installation of the gear case and brake case, and simplifying the seal structure. An object of the present invention is to provide a structure around the rear axle of a shaft drive type motor vehicle, three or four-wheeled vehicle, which is designed to improve sealing performance.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic side view of a tricycle. The tricycle 1 supports a front fork 4 that supports a front wheel 5 in a freely steerable manner via a head tube 3 at the front end of a frame 2. A tank 6 is mounted, an engine 7 is mounted below the tank 6, a seat 8 is mounted behind the tank 6, and a rear frame 9 having a U-shaped side surface is extended to the rear of the frame 2. The rear frame has 9 on the left and right, and the axle 10 is located at the rear lower part of the frame.
Two left and right rear wheels 11, which serve as drive wheels, are provided at both axial ends of the axle 10.

A drive bevel gear 13 is provided at one end of a countershaft 12 installed horizontally in the transmission case 7a of the engine 7, and is meshed with a driven bevel gear 15 of a driveshaft 14 installed in the front-rear direction, so that the driveshaft 14 is moved rearward. A final drive shaft 17 is connected to the rear of the propeller shaft 16, and a final drive shaft 17 is connected to the rear of the propeller shaft 16.
A final drive bevel gear 18 is provided on the shaft 17, which meshes with a driven bevel gear 19 provided offset to one side from the center of the axle 10 to drive the rear axle 10.

The axle 10 is supported on the vehicle body side as shown in FIGS. 3 and 4, and includes a hollow cylindrical support member 20 that surrounds the middle portion of the axle 10 and supports it in a loose manner. The support member 20 has a larger diameter than the axle 10, and has upper and lower mounting bosses 21, 21,
22, 22 are provided, and these are fastened with bolts 24 to the upper and lower parts of half-moon-shaped brackets 23, 23 fixed to the rear lower part of the rear frame.
0 is mounted and supported on the vehicle body side. One end of the support member 20 is integrally provided with one case half 25 in the shape of a concave dish that is open outward in the axial direction, and a bearing 26 is interposed inside the inner diameter of the half 25. A sealing material 2 is provided axially outward of the bearing 26.
Interpose 7. A brake drum 28 is provided on the axle 10 on the outside of the sealing material 27 by spline fitting or the like, and the brake shoe unit 29 on the half body 25 side is exposed inside the drum portion 28a of the brake drum 28.
functions as a brake panel. The above half 2
5 is covered from the outside with a cover 30, and the cover 30 is connected to the periphery of the half body 25 with bolts 31,
A sealing material 32 is interposed between the inner diameter part of the cover 30 and the outer circumference of the axle 10, and in the embodiment, between the base part 28b of the drum 28. In this way, a sealed drum brake case A is formed at one end of the support member 20.

The other end of the support member 20 is provided with the other case half 33 in the shape of a concave dish that is open outward in the axial direction, and in the embodiment, the boss portion 2 provided at the other end of the support member 20
Although the half body 33 is integrally connected to the half body 0a by bolts 33a, the half body 33 may be formed integrally with the supporting member in the same way as the half body 25. The axially outer open side of the half body 33 is closed with a cover 34, and a cylindrical boss member 35 is provided on the axle between the half body 33 and the cover 34.
The above-mentioned bevel gear 19 is disposed through the shaft, and bearings 36 and 37 are installed between the insides of both ends of the boss member 35 in the axial direction and the inner diameter portions of the half body 33 and the cover 34.
Seal materials 38 and 39 are interposed on the outsides of 6 and 37. The cover 34 described above is fastened to the half body 33 with bolts 40, thereby forming a sealed gear case B. A support member 41 for supporting the aforementioned final drive shaft 17 is formed integrally or separately on a part of the gear case half 33 in the circumferential direction, and the shaft 17 is supported by a bearing 42 on the support member 41. A sealing material 43 is interposed on the outside of the bearing 42, and the bevel gear 18 provided on the shaft 17 is constantly engaged with the bevel gear 19 within the gear case.

As is clear from the above, according to the present invention, the gear case and the brake case are integrally provided at both axial ends of the axle support member, thereby reducing the number of parts around the axle, facilitating manufacturing and assembly, and simplifying the structure. In addition, the sealing performance of the gear case and brake drum case can be improved by interposing sealing material from both sides of each case in the axial direction, and maintenance can be facilitated by removing the cover from the outside. It has many advantages such as being able to

Although a tricycle is shown in the embodiment, the present invention can also be applied to a motorized four-wheel vehicle.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic side view of a tricycle, Fig. 2 is an enlarged longitudinal sectional side view of the transmission mechanism, Fig. 3 is an enlarged cross-sectional plan view around the axle, and Fig. 4 is a schematic side view of a tricycle. The figure is a longitudinal sectional front view of the same. In the drawing, 1 is a tricycle, 5 is a front wheel, 6 is an engine, 7 is a fuel tank, 8 is a seat, 10 is a rear axle, 11 is a rear wheel, 20 is a support member, 23 is a bracket, 25 and 33 are case halves. 30 and 34 are covers, 27, 32, 38 and 39 are sealing materials, A is a brake case, and B is a gear case.

Claims (1)

[Scope of utility model registration request] An automatic three-wheel drive vehicle comprising a front wheel 5 serving as a steering wheel, two left and right rear wheels 11 serving as drive wheels, a rear axle 10 driven by a shaft drive mechanism, a fuel tank 7, an engine 6, a seat 8, etc. It is a four-wheeled vehicle 1, and a rear axle 10 is attached to brackets 23, 23 on the vehicle body side.
A support member 20 for inserting and supporting the case is detachably attached, and case halves 25 and 33 are integrally provided at both ends of the support member 20 in the axial direction.
5 and 33 are covered in the axial direction with covers 30 and 34 to form sealed cases at both ends of the supporting member in the axial direction, and sealing materials 27, 32, 38, and 39 are provided at both ends of the supporting member in the axial direction of each sealed case. A structure around the rear axle of a shaft drive type automatic three or four-wheel vehicle, characterized in that one of the sealed cases is used as the final gear case B of the shaft drive mechanism, and the other is used as the brake case A.