JPS6390486A - Rear axle axial supporter for saddling type car - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention has a rear axle housing that is rotatably supported through the rear axle housing, and a driven sprocket gear and a braked member are fixed to both sides of the rear axle housing. The present invention relates to a rear axle shaft support device for a straddle type vehicle.

(Prior Art) In a straddle-type vehicle equipped with a straddle-type seat, a front wheel that is steered by a bar handle, and left and right rear wheels that are integrally driven by a chain drive from an engine, The rear axle that transmits power is pivoted on the rear frame or swing arm, but a driven sprocket gear is fixed to one side of the rear axle, and a brake disc or drum for braking is arranged depending on the arrangement.
Because it is fixed on the V-axle on the opposite side, the structure for rotatably and immovably supporting the rear axle and mounting the driven sprocket gear and brake disc becomes complicated, resulting in increased weight and cost. There is a problem in that not only is it easy to cause damage, but also the workability of assembly and maintenance tends to decrease.

In particular, when the rear wheels are suspended independently using a double wishbone type swing arm, two universal joints (inner and outer) are interposed in the middle of the rear axle to respond to the vertical movement of the rear wheels. , the central rear axle part between the inner universal joints must be shortened as much as possible and pivoted to the rear frame, and then driven sprocket gears, brake discs, etc. must be fixed to both ends, making the structure even more complex. , and the above-mentioned problems are becoming more and more common.

(Problems to be Solved by the Invention) As described above, in a saddle type vehicle in which the two rear wheels are integrally driven by a chain drive, the rear axle to which the driven sprocket gear and the braking member are fixed is attached to the rear frame. There is a problem in that the structure supporting the shaft becomes complicated, making it difficult to assemble and maintain.This invention aims to avoid such problems by arranging the structure, making it easier to assemble and remove, and The present invention provides a rear axle shaft support device for a straddle-type vehicle, which is particularly adapted to a shortened rear axle of a rear wheel independent suspension system.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the rear axle shaft support device for a straddle-type vehicle of the present invention fixes a rear axle housing in which a lateral bearing hole is formed to the rear frame or swing arm. The rear axle, which has a driven sprocket gear mounting flange on one side and grooves for serrations and circlip fitting on the other side, is inserted into the bearing hole from the other side and rotatably supported. At the same time, a braked member of a brake device is integrally rotatably supported via serrations on the opposite rear axle protruding from the rear axle housing, and a circlip is fitted into the groove on the outside thereof.

(Function) With the above configuration, with the rear axle housing in between,
A rear axle in which a driven sprocket and a braked member are integrally connected can be easily assembled with one circlip. In other words, the flange provided at one end of the rear axle is used for positioning, the opposite side is inserted into the rear axle housing bearing hole, the member to be braked is pivotally supported by the serrations protruding on the opposite side, and the first member to be braked is used as a subena. By fitting the clip, the rear axle is supported immovably in the axial direction, and the structure is extremely simple, and the circlip can be assembled and removed by attaching and detaching a single circlip, resulting in good workability.

By making the structure FRJ, it is possible to fully meet the demand for shortening the central rear axle when the rear wheels of independent suspension are driven via a universal joint.

(Example) DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, explanation will be made with reference to figures showing embodiments of the present invention.

FIGS. 4 and 5 illustrate the configuration of a straddle-type vehicle in which independently-suspended rear wheels are integrally driven by a chain drive.

It is supported by a pair of left and right front wheels 1 and a pair of left and right rear wheels 2, and the front wheels 1 are steered with a bar handle 3, and the rear wheels 2 are driven by an installed engine 4 to drive the vehicle. The rider straddles the saddle type seat 5 and controls the bar handle 3, the engine 4, and others.

The rear frame 6a has a narrow width, and the rear wheel 2 is pivotally supported on the outer end of a double wishbone type swing arm 7 pivotally supported on both sides of the rear frame 6a. Further, a rear axle housing 8 is attached to the rear frame 6a, and a central rear axle 9 is pivotally supported. The swinging rear axle 1 is connected between both ends of the central rear axle 9 and both rear wheels 2 via an inner universal joint 10a and an outer universal joint 10b.
Connected by 1. A driven sprocket gear 12b is fixed to one end of the central rear axle 9, and a brake disc 13 of a disc brake is fixed to the other end. The driven sprocket gear 12b is driven via a chain 14 from a drive sprocket gear 12a fixed to the output shaft of the engine 4 in the center of the frame 6.

In FIGS. 1, 2, and 3, the rear axle housing 8 has a bearing hole 15 that is open on both sides, and is fixed to the rear frame 6a. The central rear axle 9 is cylindrical and has a mounting flange 16 formed on the outer surface of one end, a serration 17 formed on the outer surface of the other end, and a groove 18' formed on the outer end thereof.

Place the central rear axle 9 configured as above on the opposite side (
Insert the ball bearings 19a, 19 into the bearing hole 15 on the chain line side with the serrations 17 side first.
It is rotatably supported by b. At this time, the stepped portion 20 inside the mounting flange 16 and the outer end of the inner race of the ball bearing 19a are positioned in contact with each other, and the serrations 17 protrude on the opposite side of the bearing hole 15. A boss portion 21 of the brake disc 13 is integrally rotatably supported on the serrations 17, and the inner end of the boss portion 21 is brought into contact with the outer end of the inner race of the ball bearing 19b. In this way, the circlip 22 is fitted into the groove 18, and the assembly is completed.

In addition, 23 is a spacer interposed between the ball bearings 19a and 19b, and 24 is a ball bearing 19a and 19b.
Shows the oil seal attached to the outside. Mounting flange 16
The driven sprocket gear 12b is fixed with a tightening bolt 25, and the tightening bolt 2 is attached to the flange of the boss portion 21.
6 fixes the brake disc 13. Reference numeral 27 indicates a carrier fixed to the rear axle housing 8, which is combined with the brake disc 13 to constitute a disc brake device.

A spline 29 is provided in the inner hole 28 of the central rear axle 9.
is carved, and the input shaft 30 with left and right inner universal joints (double offset constant velocity ball joints > 10a) is inserted from both sides to rotate integrally.

On the other hand, four inner ends of a double wishbone type swing arm 7 are pivotally supported on the rear frame 6a via spherical bearings 31a, and a rear wheel bearing housing 32 is supported on the outer end of the swing arm 7 via spherical bearings 31b. It is pivotally supported via an arm 33. In this way, the bearing housing puffer 32 swings up and down while maintaining its posture. The rear wheel 2 is pivotally supported by its bearing housing 32, and its support shaft 34 has serrations 35.
is connected to the output shaft of the outer universal joint 10b. A swinging rear axle 11 is connected between the inner universal joint 10a and the outer universal joint 10b.

With the above structure, the central rear axle 9 rotates when the chain 14 is driven, and integrally drives the left and right rear wheels 2 via the inner universal joint 10a, the swinging rear axle 11, and the outer universal joints 1 to 10b. . Although the rear wheels 2 are each independently M'lH, the torque transmission described above does not change.

In the above configuration, by simply inserting the central rear axle 9 into the rear axle housing 8 and fitting the circlip 22, the driven sprocket gear 12b and the brake disc 13 can be fixed on both sides, simplifying the structure of this part, and Extremely easy to assemble and remove. The length of the central rear axle 9 can be shortened to the minimum, and the inch universal joint 10a1, the swinging rear axle 11, the outer universal joint 10b, etc. can be arranged with plenty of room.

In addition, even for rear axles that are not independently suspended but are pivoted on the frame or swing arm, and the rear wheels are fixed at both ends, the driven sprocket gear mounting flange, serrations, and grooves must be formed in the same way. This allows for easy assembly and removal by operating a single circlip.

〔Effect of the invention〕

As described above, the rear axle shaft support device for a straddle-type vehicle according to the present invention includes a driven sprocket gear attachment flange on one side of the rear axle, serrations and grooves on the opposite side, and a rear axle housing. It is inserted into the bearing hole, the serrations support the braked member of the brake device, and a circlip is fitted into the groove to support the driven sprocket in an immovable manner in the axial direction. Since the gear and the braked member can be integrally connected, the workability of assembling and disassembling this part is improved, and the H1 structure is extremely simplified, making it possible to reduce the weight of saddle-type vehicles using chain drives. This has the effect of helping reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional rear view of a rear axle shaft support for a saddle type vehicle showing an embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is an enlarged longitudinal sectional rear view of the same main part, and Fig. 4 is a rear Side view showing the configuration of a straddle-type vehicle with independent wheel suspension and chain drive, No. 5
The figure is a plan view of the same as above. 1...Front wheel, 2...Rear wheel, 4...Engine, 6a
... Rear frame, 8 ... Rear axle housing, 9 ... Central rear axle, 12b ... Driven sprocket gear, 13 ... Brake disc, 14 ... Chain, 15 ... Rear axle housing bearing hole, 16... Driven sprocket gear mounting flange, 17... Serration, 18... Concave groove, 22... Circlip.

Claims (1)

[Claims] A rear axle housing with a horizontal bearing hole is fixed to the rear frame or swing arm, a driven sprocket gear mounting flange is provided on one side, and serrations and a groove for fitting a circlip are carved on the other side. The rear axle is inserted into the bearing hole from the opposite side and rotatably supported, and a braked member of the brake device is rotatably supported via serrations on the opposite rear axle protruding from the rear axle housing, A rear axle shaft support device for a saddle type vehicle, characterized in that a circlip is fitted into the groove on the outside thereof.