JPH0784192B2 - Rear arm rear wheel support device - Google Patents

Description

The present invention relates to a rear wheel support device for a rear arm of a motorcycle, for example.

[Conventional technology]

Conventionally, the rear arm of a motorcycle is, for example, “Jitsuko Sho 47-
As shown in Japanese Patent Publication No. 28835, right and left arm portions are provided, and a plate member having an insertion hole extending in the front-rear direction is attached to the rear ends of these arm portions. The rear wheel supported by the rear arm is interposed between the rear part of the rear arm and the arm portion. The rear wheel is straddled between the axle through hole formed in the center of the hub of the rear wheel and the insertion hole. Has been inserted. Nets are respectively screwed into both ends of the axle, and the side surfaces of the plate-like member are sandwiched by these nuts, whereby the axle is clamped and fixed between the plate-like members.

[Problems to be Solved by the Invention]

By the way, when the axle is inserted across the plate member and the rear wheel, it is necessary to position the insertion hole and the axle through hole coaxially. Therefore, conventionally, the heavy and large rear wheel must be lifted by hand, and the axle through hole and the insertion hole must be aligned by vertically shifting or tilting between the left and right arm portions, and the axle insertion work. There is a problem that it requires a lot of labor and effort.

Further, in the above-described conventional configuration, the nut is tightened, the nut is pressed against the side surface of the plate-shaped member, and the axle is fixed by the frictional force generated at the contact portion between the nut and the plate-shaped member.

However, the insertion hole has a long hole shape extending in the front-rear direction, and the vertical width of the insertion hole is often set larger than the diameter of the axle so that the axle can be easily inserted. The area where the nut and the insertion hole face each other increases. For this reason, when the nut is tightened, the effective contact area between the nut and the plate-shaped member is reduced, and the frictional force generated between the nut and the plate-shaped member is reduced by that amount, ensuring sufficient fixing strength of the axle. There is a problem that you can not do it.

The present invention has been made based on such a situation, and it is possible to easily insert an axle and to firmly fix the axle to the arm portion by using a chain puller or a spacer. An object of the present invention is to provide a rear wheel support device for a rear arm that can prevent damage to the puller.

[Means for solving problems]

In order to achieve the above object, the present invention provides a pair of left and right arm portions extending rearward of a vehicle with through holes extending in the front-rear direction, respectively, and inserting a rear wheel from the rear between the arm portions. The axle through hole at the center of the rear wheel and the through hole are positioned coaxially with each other, and the axle is inserted across the through hole and the axle through hole, and the through end of the axle is fitted with a nut. It is premised on the rear wheel rear wheel support device in which the axle is fixed between the arm portions by tightening.

Then, between the rear wheel and the left and right arm portions, there are respectively interposed spacers through which the axle is densely inserted without a gap, and the spacers are coaxially held in the openings of the axle through holes. When the rear wheel is interposed between the arm portions, the upper and lower edges of the spacers are slidably contacted with the inner surface of the arm portion facing the spacers so that the spacers can be inserted through the through holes. A guide portion that extends coaxially with respect to the front-rear direction is formed, and a concave portion that extends in the front-rear direction and that is continuous with the insertion hole is formed on the outer surface of the arm portion. Fits the chain puller that can be inserted tightly without gaps in the front-rear direction, and adjusts the position of the chain puller in the front-rear direction between the front end of the chain puller and the front end of the recess. Bo It is characterized in that a and.

[Action]

According to this structure, when the upper and lower edges of the spacer are pushed along the guide portion, the insertion hole and the axle through hole are automatically positioned coaxially with each other, and the rear wheel is held between the arm portions. To be done. For this reason, it is not necessary to perform a troublesome positioning work such as tilting the heavy and large rear wheel between the arms or vertically shifting it, and the axle can be easily inserted from the side of the rear arm.

Also, since the spacer and the chain puller, through which the axle is inserted tightly without a gap, fit into the guides and recesses of the arm, respectively, transfer the load from the axle to the arm via the spacer and the chain puller. You can
Therefore, the axle can be firmly fixed to the arm portion by using the spacer and the chain puller which are essential to the rear arm.

Moreover, the adjustment bolt for adjusting the position of the chain puller back and forth is located in front of the chain puller and is surrounded by the recess, so that the chain puller comes into contact with or interferes with obstacles on the road. Nothing. Therefore, it is possible to prevent the chain puller from being damaged, and it is possible to more securely attach the axle without impacting the attachment portion of the axle.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings applied to a motorcycle.

In FIG. 5, reference numeral 1 is a frame, and an engine 2 is supported on the frame 1. A rear arm 3 is swingably supported at the rear end of the frame 1. The rear arm 3 of the present embodiment includes a pair of left and right arm portions 4, 4 having a rectangular cross section. These arm portions 4, 4 extend in the front-rear direction in parallel with each other, and their front end portions are butt-welded to the outer peripheral surfaces of both ends of a pivot pipe 5 pivotally supported by the frame 1.

Arm ends 6 and 6 having the same thickness as the arm portions 4 and 4 are welded to the rear end portions of the arm portions 4 and 4. These arm ends 6, 6 are connected by a U-shaped auxiliary arm 7 extending obliquely upward and forward, and a front panel 8 is welded between the auxiliary arm 7 and the pivot pipe 5.

A rear wheel 9 is interposed between the arm portions 4, 4. The hub 10 of the rear wheel 9 is located between the arm ends 6,6. A cylindrical bracket 12 supporting a driven sprocket 11 is bolted to one side of the hub 10, and a boss portion 14 of a brake disc 13 is bolted to the other side of the hub 10 opposite to the hub 10. ing. These hubs
10, the center of bracket 12 and boss 14, the axle 15
An axle through hole 16 is formed coaxially therethrough.

The arm ends 6 and 6 have elongated insertion holes 1 extending in the front-rear direction.
7, 17 are opened, and both ends of the axle 15 are pierced through the insertion holes 17, 17 so as to be movable in the front-rear direction.
The vertical width of the insertion holes 17, 17 is set to be larger than the diameter of the axle 15, as shown in FIG.
A gap is formed between 15 and the insertion holes 17, 17.

Collars 18, 18, which are fitted into the outer peripheral surface of the axle 15 with high accuracy and without gaps, are attached to the openings at both ends of the axle through hole 16 via bearings 19. Disc-shaped flange portions 20, 20 are integrally formed at the end portions of the collars 18, 18 on the arm end 6, 6 side. The flange portions 20, 20 are interposed between the arm ends 6, 6 and the bracket 12 and the boss portion 14, and in the case of the present embodiment, the flange portions 20, 20 form a spacer.

Inner surface facing the flange portions 20,20 of the arm ends 6,6
A pair of guide rails 21, 21 extending in the front-rear direction are provided on the 4a so as to be vertically spaced apart from each other. A guide groove 22 is formed between the guide rails 21 and 21 as a guide portion into which the flange portions 20 and 20 are slidably fitted, and the guide groove 22 inserts the flange portions 20 and 20. The holes 17 and 17 are coaxially guided. And the guide groove 22
Is opened on the rear end surface of the arm end 6,6,
The rear end portions of the guide rails 21, 21 are formed with tapered surfaces 21a, 21a that are inclined in the up-down direction as they move rearward in order to facilitate the insertion of the flange portions 20, 20.

On the outer side surfaces of the arm ends 6 and 6, recesses 23 and 23 which are continuous with the insertion holes 17 and 17 are formed. The recesses 23, 23 extend in the front-rear direction and are opened in the rear end faces of the arm ends 6, 6. Chain pullers 24, 24 for adjusting the position of the axle 15 in the front-rear direction are fitted in the recesses 23, 23 so as to be movable in the front-rear direction.

Each of the chain pullers 24, 24 has a fitting surface 24a that is in close contact with the inner surface 23a of the recess 23, 23, and a through hole 24b into which both ends of the axle 15 are inserted with high accuracy and without a gap. And axle 15
Is a through hole 24b, an insertion hole 17, a collar 18, and an axle through hole 16
The large-diameter head portion 15a at one end of the axle 15 is in contact with the outer surface of one chain puller 24. A nut 26 is screwed into the insertion tip of the axle 15. When tightening this nut 26, the chain pullers 24, 24 will be recessed 23, 23.
The fitting surface 24a is pulled inward, and the fitting surface 24a is pressed against the inner surface 23a, and this pressing fixes the axle 15 to the arm ends 6 and 6.

As shown in FIG. 3, adjustment bolts 28 are screwed into the front end faces of the recesses 23, 23 via lock nuts 27.
The adjusting bolt 28 extends in the front-rear direction in the recesses 23, 23, and its large diameter head portion 28a has chain pullers 24, 24.
Is abutted to the front surface of.

Therefore, loosen the lock nut 27 and
When the screwing amount of the adjusting bolt 28 for
The position of the axle 15 is adjusted in the front-rear direction via the chain pullers 24, 24. As a result, the distance between the driven sprocket 11 and the drive sprocket 29 on the engine 2 side is changed, and the tension of the chain 30 wound between the two sprockets 11 and 29 is adjusted.

The collar 18 located on the side of the brake disc 13
A caliper bracket 32 is supported on the outer periphery of the caliper bracket 32 via a bearing 19.
The caliper 31 is bolted.

According to such a configuration, the collars 18, 18 having the flange portions 20, 20 are held in the opening portions at both ends of the axle through hole 16 of the hub 10, and the flanges are formed on the inner side surfaces 6a of the arm ends 6, 6. Since the guide grooves 22 and 22 for guiding the portions 20 and 20 coaxially with the insertion holes 17 and 17 are formed, the flange portions 20 and 20 are pushed from the rear of the arm ends 6 and 6 along the guide grooves 22 and 22. Only by this, the axle through hole 16 and the insertion holes 17, 17 are coaxially aligned, and the hub 10 is held between the arm ends 6, 6.

For this reason, the troublesome positioning work of vertically shifting or tilting the heavy and large rear wheel 9 between the arm portions 4 and 4 is unnecessary, and the state in which the rear wheel 9 is still pushed between the arm portions 6 and 6 is eliminated. The axle 15 can be inserted from the side with.

Therefore, the mounting work of the rear wheel 9 can be easily performed, and the working time can be shortened.

Further, according to the above configuration, the spacers 18, 18 into which the axle 15 is densely inserted without a gap are such that the upper and lower edge portions of the flange portions 20, 20 of the spacers 18, 18 can slide on the guide rails 21, 21 of the arm ends 6, 6. The chain pullers 24, 24, which are in contact with each other and through which the axle 15 is inserted without a gap, are fitted into the recesses 23, 23 of the arm ends 6, 6, and the fitting surface 24a thereof is the inner surface 23a of the recesses 23, 23. It is pressed. Therefore, the axle 15 and the flange parts 20,20
Since the chain pullers 24, 24 and the chain pullers 24, 24 are integrated with each other, the axle 15 is supported by the arm ends 6, 6 via the flange portions 20, 20 and the chain pullers 24, 24.

Therefore, while the motorcycle is traveling, the load from the axle 15 can be transmitted to the arm ends 6 and 6 via the flange portions 20 and 20 and the chain pullers 24 and 24, so that the contact between the conventional nut and the arm end can be prevented. Thus, the axle 15 can be firmly fixed to the arm ends 6, 6 as compared with the case where the axle 15 is fixed.

Then, the flange portions 20 and 20 have the axle through hole 1 as described above.
6 is an indispensable configuration when aligning the insertion holes 17 and 17, and the chain pullers 24 and 24 are indispensable configurations when the position of the axle 15 is adjusted. The axle 15 can be firmly fixed to the rear arm 3 by utilizing the essential structure. Therefore, a special structure for increasing the fixing strength of the axle 15 is unnecessary, and the structure of the fixed portion of the axle 15 can be simplified.

Further, the adjusting bolt 28 for adjusting the positions of the chain pullers 24, 24 is provided in the recesses 23, 23 with the chain pullers 24, 24.
The adjustment bolt 28 does not project to the side of the rear arm 3 because it is located in front of the rear arm 3 and is surrounded by the recesses 23, 23. Do not touch or interfere with obstacles on the road.

Therefore, the adjustment bolt 28 can be prevented from being damaged, and
There is an advantage that the axle 15 can be mounted more reliably without a large impact being applied to the chain pullers 24, 24 and the axle 15.

It should be noted that the rear wheel support device according to the present invention is not limited to a motorcycle, and can be similarly implemented even if the front wheel is a two-wheeled motorcycle.

〔The invention's effect〕

According to the present invention described in detail above, the rear wheel is held between the arm portions only by pushing the spacer along the guide portion from the rear of the arm portion, and the axle through hole and the insertion hole are coaxial. Therefore, it is not necessary to perform a troublesome work of vertically shifting or tilting the heavy and large rear wheel between the arm portions. Therefore, the axle can be easily inserted from the side of the arm portion, and the workability of mounting the rear wheels can be improved accordingly, and the work time can be shortened.

Moreover, since the load from the axle can be transmitted to the arm through the spacer or chain puller, it is necessary to fix the axle firmly to the arm as compared to the conventional one that fixes the axle by the tightening force of the nut. You can In this case, the spacer is an indispensable configuration for aligning the axle through-hole and the insertion hole, and even a chain puller is an indispensable configuration for adjusting the axle position. It can be used to firmly fix the axle to the rear arm. Therefore, a special structure for increasing the fixing strength of the axle is unnecessary, and the structure of the fixed portion of the axle can be simplified.

Furthermore, the adjustment bolt that adjusts the position of the chain puller does not have to project to the rear of the rear arm, and the periphery of the adjustment bolt is surrounded by the recess, so that this adjustment bolt does not come into contact with or interfere with obstacles on the road. There is no. Therefore, the adjustment bolt can be prevented from being damaged, a large impact is not applied around the chain puller and the axle, and the attachment of the axle can be made more reliable.

[Brief description of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is a cross-sectional view of an axle mounting portion, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is FIG. FIG. 4 is a plan view in which the rear arm is partially cross-sectioned, and FIG. 5 is a side view of the motorcycle. 3 ... Rear arm, 4 ... Arm part, 9 ... Rear wheel, 15 ... Axle, 16 ... Axle through hole, 17 ... Insertion hole, 20 ... Spacer (flange part), 22 ... Guide part ( Guide groove), 23 …… recess, 24 …… chain puller, 26 …… nut, 28 …… adjustment bolt.

Claims (1)

[Claims] 1. A pair of left and right arm portions extending rearward of a vehicle are provided with through holes extending in the front-rear direction, respectively, and rear wheels are provided from the rear between the arm portions. The axle through hole at the center of the wheel and the through hole are positioned coaxially, the axle is inserted across the through hole and the axle through hole, and the through end of this axle is tightened with a nut In the rear wheel rear wheel supporting device in which the axel is fixed between the arm portions, spacers are respectively inserted between the rear wheel and the left and right arm portions so that the axle is tightly inserted without a gap. The spacer is held coaxially in the opening of the axle through hole, and when the rear wheel is interposed between the arm portions on the inner side surface of the arm portion facing the spacer, Can slide on the upper and lower edges A guide portion extending in the front-rear direction that contacts the spacer coaxially with the insertion hole is formed, and a concave portion that extends in the front-rear direction is formed on the outer surface of the arm portion that is continuous with the insertion hole. Then, a chain puller in which the axle is tightly inserted without a gap is fitted in the recess so as to be movable in the front-rear direction, and between the front end of the chain puller and the front end of the recess,
A rear wheel support device for a rear arm, wherein an adjusting bolt for adjusting the position of the chain puller in the front-rear direction is arranged.