JPH08108878A - Shaft end fixing mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a shaft end fixing mechanism capable of efficiently and firmly fixing a shaft to a support member. [Structure] A fixing collar 2 that fits into a support hole 3 of a vehicle body frame Fa, Fb is provided, and a fixing hole 14 through which the pivot shaft 1 penetrates is provided in the fixing collar 2, and further, the fixing collar. 2 has one slit 17 formed in the axial direction from the tip of the fixing collar to the front of the flange portion 15, and the tapered shaft portions 1a and 1b are formed at both ends of the pivot shaft 1. Further, a male screw 6 is engraved on the tip portion thereof, and nuts 4 and 5 that are screwed into the male screw are provided, and the inner diameter side of the fixing collar 2 corresponds to the tapered portion of the pivot shaft 1. Thus, the tip side is tapered so that the diameter is small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft end fixing mechanism.
More specifically, the radial displacement of a shaft such as a pivot shaft, a rear axle, or a front axle for swingably supporting a swing arm of a motorcycle with respect to the bearing portion, that is, rattling between the shaft and the bearing portion. The present invention relates to a shaft end fixing mechanism that eliminates the above.

[0002]

2. Description of the Related Art As a conventional shaft end fixing mechanism, for example, a pivot shaft 5 for swingably supporting a swing arm 51 of a motorcycle shown in FIG.
3, or a fixing mechanism such as the front axle 54 or the rear axle 55 is known.

Of the shaft end fixing mechanism, FIG. 5 illustrates a fixing mechanism of the pivot shaft 53. This pivot shaft 5 whose both ends are supported by the body frame F
3 is formed of a stepped pipe, and male threads are engraved on both ends thereof. A sleeve 56 is fitted onto the small diameter portion of the pivot shaft 53, and a pivot pipe 57 is fitted on the outer peripheral side thereof. A swing arm (not shown) is fixed to the pivot pipe 57, a ball bearing 58 is provided between the pivot pipe 57 and the pivot shaft 53 at one end of the pivot pipe 57, and between the sleeve 56 and the sleeve 56 near both ends of the pivot pipe 57. A needle bearing 59 is interposed in the swing arm so that the swing arm fixed to the pivot pipe 57 can swing about the pivot shaft 53. Reference numeral 60 is a seal member, 61a is a collar having an internal thread, and 61b is a spacer.

The pivot shaft 53 is a body frame F.
Nuts 62a and 62b which are inserted into the support holes of the (in FIG. 5, inserted from left to right in the drawing) and screwed to both ends thereof.
Is fastened to the vehicle body frame F by fastening.

By the way, as described above, the diameter of the support hole of the body frame F is made larger than the outer diameter of the pivot shaft 53 so that the pivot shaft 53 can be easily inserted into the support hole of the body frame F during assembly.
There is a radial gap in the pivot shaft 53 between the pivot shaft 53 and the support hole, which causes rattling.

In order to eliminate such rattling, Japanese Patent Laid-Open No. 6-
It is necessary to provide a gap adjusting mechanism such as a fixed collar and an adjusting collar as disclosed in Japanese Patent No. 87481. Also, the nuts 62 on both ends of the pivot shaft 53 are
The body frame F is deformed by tightening a and 62b, that is, both portions F of the body frame F shown in the figure.
The deformation of a and Fb is performed in the direction of approaching each other. That is, the sleeves 56 and the pivot shaft 53 are pinched by the two parts Fa and Fb via the collar 61a and the spacer 61b, and the frictional force between the body frames Fa and Fb and the collar 61a and the spacer 61b at that time is generated. Rattling between the pivot shaft 53 and the support hole is prevented.

As shown in FIG.
9 is a pivot shaft support mechanism disclosed in No. 9. This is a collar 63 interposed between the body frame F and the pivot shaft 53, and a collar 63 in which the pivot shaft bearing hole 63a is eccentric to the collar outer diameter is also prepared. The purpose is to easily change the swing center of the swing arm.
Also in this support mechanism, the play between the pivot shaft 53 and the support hole of the body frame F is limited to the pivot shaft 5
The frictional force associated with the tightening of the nuts 62a and 62b at both ends is attempting to be eliminated.

[0008]

However, since the relative displacement between the body frame F and the body frame F is prevented by the frictional force with the body frame F, the nuts 62a and 62b may be slightly loosened or the collars may be used for a long period of time. Even if the sleeve or sleeve is slightly deformed or worn, the frictional force is reduced, and the rattling prevention function is reduced. As a result, although it does not affect the normal operation of the motorcycle, the rigidity of the support portion of the swing arm may decrease under severe usage conditions such as racing, and it also affects the riding comfort.

This also applies to the front axle and the rear axle.

The present invention has been made to solve the above problems, and in particular, it is not necessary to deform the support member (for example, the vehicle body frame) by applying a strong clamping force in the axial direction of the shaft, and the shaft can be efficiently used. It is an object of the present invention to provide a shaft end fixing mechanism that can be firmly and firmly fixed to a support member.

[0011]

A shaft end fixing mechanism according to a first aspect of the present invention is a shaft end fixing mechanism for fixing a shaft penetrating into a support hole formed in a support member. A fixing collar that fits into the hole, the fixing collar has a bearing hole through which the shaft penetrates, and the fixing collar has at least one axially extending end of at least the fixing collar. To the middle of the entire length, the vicinity of the end of the shaft is tapered and a male screw is engraved at the tip of the shaft, and a set screw member screwed to the male screw. Is provided, and the inner diameter side of the fixing collar is tapered so that its tip end side has a small diameter so as to correspond to the taper.

A shaft end fixing mechanism according to a second aspect of the present invention is
A shaft end fixing mechanism for fixing a shaft penetrating a support hole formed in a support member, wherein a male screw is engraved at a tip end portion of the shaft, and a set screw member screwed to the male screw is provided. Is provided with a fixing collar that fits into the support hole, the fixing collar has a bearing hole through which a shaft penetrates, and further, the fixing collar has at least one in the axial direction, The fixing collar is provided with a slit from one end to the middle of the entire length, and the outer diameter side of the fixing collar is tapered so that the tip has a small diameter, and the supporting hole of the supporting member corresponds to the taper. It is characterized by being tapered.

In the shaft end fixing mechanism according to the first aspect, the outer diameter side of the fixing collar is tapered so that its tip has a small diameter, and the supporting hole of the supporting member is tapered corresponding to the taper. You can also do it.

In the shaft end fixing mechanism according to the first or second aspect, a flange is formed at the rear end of the fixing collar, and a screw hole is formed in the flange. It is preferable that the tip of the bolt pushes the surface of the support member by screwing the bolt therein, and the fixing collar can be easily pulled out by its reaction.

Regarding the "front end" and "rear end" of the fixing collar in the claims, when the fixing collar is interposed between the shaft and the support hole of the supporting member, the end portion of the shaft is The end located on the side is called the rear end, and the opposite end is called the front end.

[0016]

According to the shaft end fixing mechanism of the first aspect of the present invention, the fixing collar is mounted in the supporting hole of the supporting member from its tip, and the end portion of the shaft is inserted into the bearing hole of the fixing collar. ,
When the set screw member is tightened into the male screw at the end of the shaft, the shaft tries to further enter into the bearing hole of the fixing collar, and the taper portion at the end of the shaft causes the fixing collar to expand its diameter starting from the slit. As a result, the fixing collar is pressed between the shaft and the inner diameter side of the support hole of the support member. That is, the shaft is clamped. This clamping is done individually at each end of the shaft. Therefore, the shaft is effectively and firmly fixed to the support member. Further, since a wedge effect is produced between the tapered portions, the shaft is not loosely fixed.

According to the shaft end fixing mechanism of the second aspect of the present invention, the fixing collar is attached to the supporting hole of the supporting member from its tip, and the end portion of the shaft is inserted into the bearing hole of the fixing collar. , If the set screw member is tightened into the male screw at the end of the shaft, the set screw member pushes the fixing collar, so that the fixing collar tries to further enter the support hole of the support member, and the taper portion on the inner diameter side of the support hole causes The fixing collar reduces its diameter starting from the slit. As a result, the fixing collar is pressed between the shaft and the inner diameter side of the support hole of the support member.
That is, the shaft is clamped by the collar.
This clamping is done individually at each end of the shaft.
Therefore, the same action and effect as in the shaft end fixing mechanism according to the second aspect can be obtained.

[0018]

Embodiments of the shaft end fixing mechanism of the present invention will now be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a shaft end fixing mechanism according to the first aspect of the present invention, FIG. 2 is a perspective view showing a fixing collar in the shaft end fixing mechanism of FIG. 1, and FIG. FIG. 4 is a sectional view showing an embodiment of a shaft end fixing mechanism according to a second aspect of the invention, and FIG. 4 is a perspective view showing a fixing collar in the shaft end fixing mechanism of FIG.

In FIG. 1, reference numeral 1 denotes a hollow pivot shaft for swingably supporting a swing arm of a motorcycle, which is a body frame portion Fa divided into left and right parts.
It is fixed to Fb. Reference numeral 2 is a fixing collar that is fitted into the support holes 3 of the vehicle body frames Fa and Fb at both ends of the pivot shaft 1. Reference numerals 4 and 5 denote nuts screwed to male screws 6 formed at both ends of the pivot shaft 1, respectively. A step portion 7 is formed on the outer peripheral surface of the pivot shaft 1, and a sleeve 8 is externally fitted and inserted in the small diameter portion. Further, a pivot pipe 9 to which a swing arm (not shown) is fixed is fitted around the outer circumference of the sleeve 8. A ball bearing 10 is attached to one end of the pivot pipe 9 between the pivot pipe 1 and the pivot shaft 1, and a needle bearing 1 is attached between both ends of the pivot pipe 9 and the sleeve 8.
1 is attached. As a result, the swing arm fixed to the pivot pipe 9 can swing about the pivot shaft 1 as the central axis. Reference numeral 12 is a seal member that holds the lubricating oil supplied to the bearings 10 and 11 and that also prevents dust and water from entering from the outside, and 13 is a spacer.

In the vicinity of both ends of the pivot shaft 1,
Tapered portions 1a and 1b are formed closer to the center side than the male screw 6 and having a reduced diameter toward the ends. The outer diameter side has a cylindrical shape with the same diameter. Also, the inner diameter side of the fixing collar 2,
That is, the bearing hole 14 into which the end portion of the pivot shaft 1 is inserted has a tapered shape corresponding to the tapered portions 1a and 1b of the pivot shaft 1.

As will be apparent with reference to FIG. 2 as well, the rear end portion of the fixing collar 2, that is, the end portion on the side where the bearing hole 14 has a small diameter due to the taper, is arranged in the radial direction. A quadrangular flange portion 15 is formed outward. A screw hole 1 is provided at each of the four corners of the flange portion 15.
6 is perforated.

Further, one slit 17 is formed in the axial direction from the front end of the fixing collar 2 to the vicinity of the flange portion 15.

Therefore, the bearing hole 1 of the fixing collar 2
If the tapered distal end of the pivot shaft 1 is inserted into the inside of the fixing collar 2 from the large diameter side, the fixing collar 2 has the slit 17 thereof.
Is enlarged due to the existence of By utilizing this, the pivot shaft 1 is separately fixed to the support holes 3 of the vehicle body frame at each end thereof.

That is, referring to FIG. 1, (1) First, the fixing collar 2 is attached to the support hole 3 of the right body frame Fb.

(2) Next, the pivot shaft 1 with the sleeve 8 fitted therein is inserted through the left support hole 3.
At that time, each bearing 10, 11, the seal member 12,
The spacer 13 and the pivot pipe 9 are arranged between the vehicle body frames Fa and Fb, and are fitted around the outer periphery of the pivot shaft 1 when the pivot shaft 1 is inserted.

(3) Next, the collar 2 is attached to the left support hole 3 while inserting the left end of the pivot shaft 1 into the bearing hole 14 of the support hole 3.

(4) Finally, the nut 5 on the right side of the pivot shaft 1 in the figure is tightened to position the pivot shaft 1 left and right, and then the nut 4 on the left side is tightened. Tighten nuts 4 and 5 on both ends.

(5) Then, as described above, the fixing collar 2 is formed by the tapered portions 1a and 1b of the pivot shaft 1.
Since the diameter is increased, the tapered portion 1 of the pivot shaft 1
a, 1b and the support hole 3 of the vehicle body frame for fixing the collar 2
Thus, each end of the pivot shaft 1 is fixed to the vehicle body frames Fa and Fb.

Since this fixing uses the wedge effect, the frictional force due to the pressure contact between the tapered portions is maintained.

Further, since the fixing collar 2 is adopted as described above, the swing center of the swing arm is formed by forming the eccentric bearing hole as in the prior art (Japanese Utility Model Laid-Open No. 5-35579). It is also possible to change.

As described above, since the pivot shaft 1 is separately fixed to the support holes 3 of the vehicle body frame at their respective ends, the pivot shaft 1 receives almost no axial force over its entire length. Therefore, the deformation of the pivot shaft 1 is small. Further, as is clear from FIG. 1 (left side portion), there is no inconvenience even if there is a gap between the body frame Fa and the pivot pipe 9. Furthermore, frame F
The conventional collar with internal thread (reference numeral 61a in FIG. 5) for eliminating rattling in the left-right direction with respect to a and Fb is unnecessary.

Next, when disassembling the shaft end fixing mechanism in order to remove the pivot shaft 1, it is first necessary to remove the fixing collar 2 which is firmly fixed as described above. In that case, if a bolt is screwed into the screw hole 16 formed in the flange portion 15 of the fixing collar 2, the tip of the bolt strongly pushes the surface of the vehicle body frame corresponding to the flange portion. The fixing collar 2 can be easily removed. Further, if screw holes are also formed at the positions on the outer surface of the vehicle body frame corresponding to, for example, one or two of the four screw holes 16, it can be utilized as a storage portion for the bolts. .

The shaft end fixing mechanism shown in FIG. 3 also fixes both ends of the pivot shaft 21 to the vehicle body frames Fa and Fb by utilizing the above-mentioned wedge effect. The difference is that the tapered portion is not formed on the inner diameter side of the pivot shaft 21 and the fixing collar 22, but instead the outer peripheral surface of the fixing collar 22 is tapered such that the tip side thereof has a small diameter. In addition, the support holes 23 of the vehicle body frames Fa and Fb have a tapered shape corresponding to the taper of the fixing collar 22 (see also FIG. 4). Other configurations are the same as those shown in FIGS. Also in the shaft end fixing mechanism having such a configuration, the same effect as that of the above-described embodiment (FIGS. 1 and 2) is obtained.

That is, as shown in FIG. 3, all the parts are mounted on the vehicle body frames Fa and Fb and the pivot shaft 2 is attached.
By tightening nuts 4 and 5 on both ends of 1, fixing collar 2
2 is pushed into the support hole 23. At this time, the fixing collar 22 is reduced in diameter from the slit 24 as a starting point due to the taper of the support hole 23. As a result, the fixing collar 22 firmly grips the end portion of the pivot shaft 21.

Further, the structure of FIGS. 1 and 2 or the structure of FIGS. 3 and 4 or a combination thereof is adopted as the shaft end fixing mechanism on one end side of the pivot shaft, and the one end side is adopted as the shaft end fixing mechanism on the other end side. 1, 2 or 3, 4 or a combination thereof different from the above may be adopted. For example, one end has the configuration of FIGS. 1 and 2 and the other end has the configuration of FIGS.

The fixing collars 2 and 2 shown in FIGS.
In each of the slits 2, the slits 17 and 24 are formed only in one place, but the present invention is not particularly limited to that and may be formed in two or more places.

Further, in FIGS. 2 and 4, the slits 17 and 2 are formed only from the tip of the fixing collar to the vicinity of the flanges 15 and 25.
No. 4 is not formed, but the present invention is not particularly limited thereto, and may be formed over the entire length of the fixing collar, for example. In this case, it is obvious that only one can be formed.

It will be apparent that the above-mentioned shaft end fixing mechanism is not limited to the pivot shaft particularly in a motorcycle, but can be applied to a front axle, a rear axle, an engine mount or the like.

[0040]

According to the present invention, the shaft can be efficiently and firmly fixed to the support member without deforming the support member by applying a strong clamping force particularly in the axial direction of the shaft. There is no rattling due to the gap with the member, and a complicated structure such as a gap adjusting mechanism is not required.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a shaft end fixing mechanism according to a first aspect of the present invention.

FIG. 2 is a perspective view showing a fixing collar in the shaft end fixing mechanism of FIG.

FIG. 3 is a sectional view showing an embodiment of a shaft end fixing mechanism according to a second aspect of the present invention.

FIG. 4 is a perspective view showing a fixing collar in the shaft end fixing mechanism of FIG.

FIG. 5 is a sectional view showing an example of a conventional shaft end fixing mechanism.

FIG. 6 is a sectional view showing another example of a conventional shaft end fixing mechanism.

FIG. 7 is an explanatory view showing a portion to which a shaft end fixing mechanism is applied in a motorcycle.

[Explanation of symbols]

 1, 21 ... Pivot shaft 1a, 1b ... Tapered portion 2, 22 ... Fixing collar 3, 23 ... Support hole 4, 5 ... Nut 6 ... Male screw 14 ... Bearing Hole 15, 25 ... Flange 16 ... Screw hole 17, 24 ... Slit Fa, Fb ... Body frame

Claims (4)

[Claims] 1. A shaft end fixing mechanism for fixing a shaft penetrating into a support hole formed in a support member, comprising a fixing collar fitted into the supporting hole, the fixing collar comprising: The shaft is provided with a bearing hole, and the fixing collar further includes at least one slit in the axial direction from at least one end of the fixing collar to the middle of the entire length, and the vicinity of the end of the shaft. Is tapered, and further has a male screw engraved on its tip, and a set screw member that engages with the male screw is provided, and the inner diameter side of the fixing collar corresponds to the taper. A shaft end fixing mechanism in which the tip side is tapered so as to have a small diameter. 2. A shaft end fixing mechanism for fixing a shaft penetrating into a support hole formed in a support member, wherein a male screw is engraved at a tip end portion of the shaft, and the male screw is screwed into the male screw. A set screw member is provided, a fixing collar that fits into the supporting hole is provided, the fixing collar has a bearing hole through which a shaft penetrates, and further, the fixing collar is provided in the axial direction. At least one slit is provided from at least one end of the fixing collar to the middle of the entire length, and the outer diameter side of the fixing collar is tapered so that the tip has a small diameter, and the supporting hole of the supporting member is provided. Is a shaft end fixing mechanism that has a tapered shape corresponding to the taper. 3. The shaft according to claim 1, wherein an outer diameter side of the fixing collar is tapered so that a tip of the fixing collar has a small diameter, and a support hole of the support member is tapered corresponding to the taper. Edge fixing mechanism. 4. The shaft end fixing mechanism according to claim 1, wherein the fixing collar has a flange portion at a rear end thereof, and a screw hole is formed in the flange portion.