JPH048685A - Structure of tightening front axle of motorcycle - Google Patents

Abstract

PURPOSE:To reduce the number of parts and enhance rigidity of a tightening portion by providing an axle to be connected to one tightening portion by a screw, and a bolt capable of tightening a slit communicating the axle through hole and the bottom face of the tightening portion with each other. CONSTITUTION:A male screw 20a is cut at the end of an axle 20 and a female screw 20b is cut in the inner periphery of an axle through hole 25 and tightened to the screw 20a and also in a tightening portion 23 a slit 42 is formed which communicates the lower portion of the axle through hole 25 with the bottom face of the tightening portion 23 and which is cut by half the length of the inside of the tightening portion 23. A bolt hole 36 perpendicular to the slit 42 is formed and the slit 42 is tightened by the bolt 40 so that the axle 20 is tightened and fixed to a front fork 6b. The number of nuts and bolts is therefore reduced as compared to conventional front axle tightening structures and also rigidity of the tightening portion 23 is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a front axle tightening structure for a motorcycle for fixing a front wheel axle and a front fork.

[Conventional technology] The conventional tightening structure between the front wheel axle and the front fork has been replaced with the sixth one.
This will be explained with reference to FIGS. 8 to 8. FIG. 6 is a sectional view of the front axle tightening structure, FIG. 7 is a side view of the tightening section, and FIG. 8 is a bottom view of the tightening section.

In FIG. 6, tightening portions 22 and 23 are provided at the tips of the left and right front forks 6av6b.
．． A bolt-shaped axle 20 is inserted into an axle insertion hole 24.25 formed in 23 and fixed with a nut 26. Collars 27, 28, 29 are disposed on the outer periphery of the axle 20, and the front wheel 7 is rotatably supported on the outer periphery of the collar 27, 28 via a bearing 30, 31. In addition, 32.
33 is a sealing member.

As shown in FIGS. 7 and 8, the tightening portion 22.23 is formed with a slot 35 that communicates with and parallel to the lower part of the axle insertion hole 24.25. Two bolt holes 36 are formed perpendicularly to the slot 35. In addition, 37 is front fork 6as6
This is a bolt hole for fixing an inner tube (not shown) located inside b. Then, connect the left and right front forks 6a16b with two bolts 38, 39, 40, respectively.
By tightening the slot 35 at 41, the axle 20
is fastened to the front fork eaNeb.

[Problem to be solved by the invention] However, in the above conventional front axle tightening structure,
Since the structure includes the nut 26 and four bolts 38 to 41, there are many parts, and the workability when replacing the front wheel 7 is poor.Furthermore, there is a problem that the nut 26 protrudes outward. ing.

Also, instead of tightening the axle 20 and the right front fork 6b with the nuts 26 and poles 40, 41, a male thread is cut at the tip of the axle 20 and the axle insertion hole 25 is tightened.
A method of tightening by cutting a female thread on the inner periphery of the wheel is also known, but this method has the problem that it tends to loosen due to twisting of the axle.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide a front axle fastening structure for a motorcycle that has a reduced number of parts and is highly rigid.

[Means for Solving the Problems] To achieve this, the front axle tightening structure for a motorcycle of the present invention includes tightening portions 22, 23 provided at the tips of the left and right front forks 6aN6b, and the left and right tightening portions 22,23. The axle 20 inserted between the parts and screwed to one of the fastening parts 23 communicates with the axle insertion hole 25 of the one fastening part 23 and the bottom of the fastening part 23, and the inner half in the axle direction It is characterized by having a slot 42 formed therein and a bolt 40 that allows the slot to be tightened.

Note that the numbers added to the above configurations are for comparison with the drawings, and the configurations of the present invention are not limited thereby.

[Function] In the present invention, as shown in FIGS. 1 to 3, for example, the tip of the axle 20 is screwed to the fastening part 23 of the front fork 6b, and the fastening part 23 is provided with an axle insertion hole. A slot 42 is formed in communication with and parallel to the lower part of the 25, and is cut by the length of the inner half of the tightening part, and by tightening the slot 42 with the bolt 40, the axle 20 is moved to the front. Tighten and fix to the fork 6b.

[Example code] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 shows an overall side view of a motorcycle according to the present invention. A front fork 6 is rotatably attached to the front fork 2, and a front wheel 7 is supported through an axle 20 at the lower part of the front fork 6. Further, a rear arm 9 is swingably attached to the rear arm bracket 5, and a rear wheel 10 is supported via the rear arm θ.

A fuel tank 11 is provided above the main frame 3, and a seat 12 is provided on the seat rail 4. An engine 13 is mounted and fixed between the main frame 3 and the rear arm bracket 5.
3 are connected to left and right mufflers 14.15 and silencers 16.17. A rear fender 19 is disposed on the rear wheel 10, and a front fender 21 is disposed above the front wheel 7.

1 to 3 show one embodiment of the front axle tightening structure for a motorcycle according to the present invention, FIG. 1 is a sectional view of the front axle tightening structure, FIG. 2 is a side view of the tightening part, FIG. 3 is a bottom view of the tightening part.

In FIG. 1, tightening portions 22 and 23 are provided at the tips of the left and right front forks 6a>6b.
．． The bolt-shaped axle 20 is inserted into the axle insertion hole 24.25 formed in the axle 23. Collars 27, 28, 29 are disposed on the outer periphery of the axle 20, and the front wheel 7 is rotatably supported on the outer periphery of the collar 27, 28 via a bearing 30, 31.

Note that 32 and 33 are seal members.

The tightening structure between the front fork 6a and the axle 20 on the left side of the figure is the same as the conventional structure explained in FIGS. 7 and 8. That is, a slot 35 is formed in the tightening portion 22 and is cut in parallel to the lower part of the axle insertion hole 24 in communication with the lower part of the axle insertion hole 24 .
One bolt hole 36 is formed and two bolts 38.39
By tightening the slot 35 at , the axle 20 is fixedly tightened to the front fork 6a.

The tightening structure of the front fork 6b and the axle 20 on the right side of the figure is a feature of the present invention.

That is, a male thread 20a is cut at the tip of the axle 20 and a female thread 20b is cut on the inner periphery of the axle insertion hole 25 for tightening. A slot 42 is formed which connects the lower part of the axle insertion hole 25 and the bottom surface of the tightening part 23, and is cut in the axle direction by the length of the inner half of the tightening part 23, and A bolt hole 36 is formed perpendicularly to the slot 42, and by tightening the slot 42 with the bolt 40, the axle 20 is fastened and fixed to the front fork 6b. Note that 37 is a bolt hole for fixing an inner tube (not shown) in the front fork 6b.

Therefore, compared to the conventional front axle tightening structure, the number of nuts and bolts can be reduced, and the rigidity of the tightening part can be increased.

Next, the tightening structure of the steering shaft will be explained with reference to FIG.

The steering shaft 51 is disposed to pass through the head pipe 2 and the crown handle 52, and is rotatably supported by the head pipe 2 via tapered bearings 53 and 54. The inner race 55 of the upper tapered bearing 53 is tightened by a nut 57 via a cover ball race 56. A step 58 is formed on the steering shaft 51, and a washer 59 for preventing the nut 57 from rotating is disposed on the step 58. Then, the steering shaft 51 is tightened with a bolt 60 via the crown handle 52 and washer 59.

Therefore, the structure is such that the axial force from the bolt 60 is received by the step 58 of the steering shaft 51 and is not applied directly to the nut 57. Conventionally, a separate nut was used to prevent the axial force from the bolt 60 from acting directly on the nut 57, but the above structure makes it possible to eliminate that nut.

[Effects of the Invention] As explained above, according to the present invention, there are fastening parts provided at the tips of the left and right front forks, and a fastening part that is inserted between the left and right fastening parts and screwed to one of the fastening parts. A slot is formed in the inner half of the axle in the axle direction, communicating the axle, the axle insertion hole of one of the fastening parts with the bottom surface of the fastening part, and a bolt that makes it possible to tighten the slot. Because of this structure, it is possible to provide a front axle fastening structure for a motorcycle with a reduced number of parts and a fastening part with high rigidity.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the front axle tightening structure for a motorcycle according to the present invention, FIG. 1 is a sectional view of the front axle tightening structure, FIG. 2 is a side view of the tightening part, 3 is a bottom view of the tightening part, FIG. 4 is an overall side view of the motorcycle according to the present invention, and FIG. 5 is a sectional view showing the tightening structure of the steering shaft.
Figures 6 to 8 show the front axle tightening structure of a conventional motorcycle, with Figure 6 being a sectional view of the front axle tightening structure, Figure 7 being a side view of the tightening part, and Figure 8 being the front axle tightening structure. It is a bottom view of an attached part. 6av6b...Front fork, 20...Axle,
22.23...Tightening part, 25...Axle insertion hole, 40
...Bolt, 42...Slotted.

Claims (1)

[Claims] (1) A tightening part provided at the tips of the left and right front forks, an axle that is inserted between the left and right tightening parts and screwed to one of the fastening parts, and an axle insertion hole in the one tightening part. 1. A front axle tightening structure for a motorcycle, characterized in that the front axle tightening structure for a motorcycle is characterized by comprising a slot formed in the inner half in the axle direction and communicating with the bottom surface of the tightening part, and a bolt that enables the slot to be tightened.