JPH0891274A - Front axle support structure for motorcycles - Google Patents

Abstract

(57) [Summary] [Purpose] A front axle support structure for motorcycles that reduces the work load by reducing the number of front axle parts that have a tubular nut screwed at one end, and simplifies assembly. provide. [Structure] The large diameter portion 35 of the front axle 34 and the tubular nut 32 are attached to the wheel bearings 22b and 22a.
To the positions B and A adjacent to the wheel bearings 22b and 22a of the large diameter portion 35 and the tubular nut 32, and the collar-shaped member 36,
36 is provided, and the side surfaces of the wheel bearings 22b and 22a are sealed from the outside by the collar-shaped members 36, 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front axle support structure for a motorcycle. More specifically, the present invention relates to a front axle support structure for a motorcycle in which a front axle formed by screwing a tubular nut at one end is fastened to and supported by a front fork via the tubular nut and the other end of the front axle.

[0002]

2. Description of the Related Art Generally, a front axle support structure for a motorcycle has a structure shown in FIG. As shown in FIG. 4, in the front forks 10 and 10, both ends of the front axle 20 are fixed and the front axle 2 is fixed.
The front wheel 16 is pivotally supported via 0. The front axle 20 extends a shaft portion of a commonly used bolt and forms a male screw at one end 20a to be screwed into a female screw formed in a mounting hole 12a of the front fork 10 and at the other end 20b. The diameter of the shaft portion near the head portion is increased to form the large diameter portion 21, which is then fitted into the other mounting hole 12b. The front axle 20 is connected to the front wheel 16 from the mounting hole 12b of the front fork 10 on the other side through the hollow of the tubular axle spacer 14.
The front wheel 16 is rotatably supported by the front fork 10 by means of wheel bearings 22, 22 which are inserted in the center hole 18 of the front fork 10.

In this case, a pair of wheel bearings 22 are provided at both ends of the front wheel 16 in the vehicle width direction, and a center spacer 24 is interposed between the wheel bearings 22 and 22.
4, the distance between the wheel bearings 22 is kept constant. Further, the axle spacers 14 keep the distance between the front forks 10 and 10 on both sides and the wheel bearings 22 and 22 constant. Reference numeral 23 is a speedometer gear gearbox.

The front axle 20 has a large diameter portion formed at the other end 20b of the front axle 20 by inserting the spacer 14, the bearing 22, the center spacer 24, the bearing 22 and the speedometer gearbox 23 in this order. The step portion at the right end of 21 abuts the axle spacer 14 to position the front wheel 16 with respect to the front fork 10 on the other side, and the mounting hole 12 for the front fork 10 on one side.
The male screw of the front axle one end portion 20a is screwed onto the female screw of a and is tightened.

[0005]

However, in the above-mentioned prior art, when the front tire is attached and detached, many of them pass through the axle spacer 14 and the like, and the work must be performed with care so as not to drop them. No, it takes time. Further, in order to improve the dust-sealing property of the front wheel 16, a spacer 14 in which a collar (collar) 26 is fitted on the outer periphery is used as the spacer, and the collar 26 is larger than the inner diameter of the mounting hole 12b. Attach the front axle 20 to the mounting hole 12
The structure is such that it cannot be inserted into the hole of the spacer 14 only after it is inserted into b.

On the other hand, in order to simplify the assembly, there is one in which a quick change mechanism 28 is provided at the lower end portion of the front fork 10 as shown in FIG. In FIG. 5, one end portion 20a of the front axle 20 is screwed with a tubular nut 30 having the same diameter as the large diameter portion 21 of the other end portion 20b. The quick change mechanism 28 clamps and fixes to the front forks 10, 10. The quick change mechanism 28 is one in which the lower end of the front fork 10 is vertically divided from the center of the mounting hole 12a, and one end is fixed with a bolt 28a and the other end is fixed with a hinge 28b. By removing the bolt 28a, The mounting hole 12a is released so that the front axle 20 can be removed downward.

However, even with the quick change mechanism 28 described above, when the spacers 14 and 24 and the bearings 22 and 22 are attached to the front axle 20, the accelerator spacers 14 and 24, the bearings 22 and 22 are attached to the front axle 20. 22 through the front axle 20 and the front fork 10,
It is necessary to attach to No. 10 and there is a demand to reduce the number of assembling parts and improve workability.

The present invention has been made in view of the above-mentioned conventional problems, and simplifies the assembly by reducing the number of parts of the front axle formed by screwing a tubular nut at one end. An object of the present invention is to provide a front axle support structure for a motorcycle that can reduce the work load.

[0009]

The present invention is to solve the above-mentioned problems and has the following constitution. That is, according to the present invention, a tubular nut is provided at one end of a front axle that rotatably supports a front wheel via a wheel bearing, and the front end is provided through the tubular nut and the large diameter portion at the other end of the front axle. In a motorcycle front axle support structure for fixedly supporting an axle on a front fork of the motorcycle, the large diameter portion and the tubular nut are extended to a position adjacent to the wheel bearing, and the large diameter portion and A front axle support structure for a motorcycle, wherein a flange-shaped member is provided at a position adjacent to the wheel bearing of the tubular nut, and a side surface of the wheel bearing is sealed from the outside by the flange-shaped member.

[0010]

According to the present invention, since the large diameter portion and the tubular nut of the front axle are extended to the position adjacent to the wheel bearing, it is possible to dispose an accelerator spacer between both end portions of the front accelerator and the wheel bearing. The positional relationship between the wheel bearing and the front fork can be fixed. That is,
The front axle and tubular nut can also function as spacers. Further, since a collar-shaped member is provided at a location adjacent to the wheel bearing of the large diameter portion and the tubular nut, and the side surface of the wheel bearing is sealed from the outside by the collar-shaped member, the collar-shaped member is provided. The front axle and the tubular nut can be assembled in this state, which facilitates the assembly.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A front axle support structure for a motorcycle according to the present invention will be described below in detail with reference to the drawings according to the illustrated embodiments. Note that the illustrated embodiment is different from the prior art in the configuration of the tubular nut and the front axle provided at one end of the front axle. Only the portions related to the tubular nut and the front axle will be described, and the other same portions will be described. Are denoted by the same reference numerals as those described in the section of the prior art, and description thereof will be omitted. 1 (a),
(B) is an enlarged cross-sectional view and a side view of a main part of a motorcycle adopting the front axle support structure of the present invention, and FIG. 2 is a perspective view of a tubular nut and a front axle used in the front axle support structure of the above-mentioned embodiment. 3 and 4 are partial cross-sectional views for explaining the wheel belling and the collar-shaped member.

In the front axle support structure of the embodiment, one end (right side in FIG. 1) 34a of a front axle 34 that rotatably supports the front wheel 10 via wheel bearings 22a and 22b is attached to a tubular nut 32. The front axle 34 is screwed to the front nut 34 of the motorcycle via the large diameter portion 35 of the tubular nut 32 and the other end (the left end when directly facing FIG. 1) 34b of the front axle 34, A quick change mechanism 28 is fixedly supported on the unit 10.

The front axle 34 has the other end 34b having a large-diameter portion 35 formed by extending the head portion of an ordinary bolt into a cylindrical shape, the shaft portion of the bolt, and a male screw at the tip of the shaft portion. And one end 34a thereof. The other end 34b is extended to a position B adjacent to the wheel bearing 22b provided on the other end 34b side with the front axle 34 mounted on the front fork 10, and the extended end portion A brim-shaped member 36 that covers the end surface of the wheel bearing 22b on the side of the other end 34b is externally fitted to this. Further, a flange 34b1 is formed in an annular shape at the end of the other end 34b, and a hexagonal hole 34b2 having the same shape as the hexagon socket head cap bolt is formed in the central portion of the shaft. Can be rotated.

The cylindrical nut 32 has the one end 34a when the end portion 32b on the 34b side is attached to the front forks 10, 10.
Is extended in a tubular shape toward the other end 34b to a position A adjacent to the side wheel bearing 22a. Further, an end portion 32a of the tubular nut 32 on the side of the one end 34a is provided with an annular flange 32a1 protruding from the tip, and a hexagonal hole 32a2 having the same shape as the hexagon socket head cap bolt is formed at the center of the shaft of the tip.
Is formed so that the tubular nut 32 can be rotated with a hexagon wrench. A flange-shaped member 36 is provided on the other end side end portion 32b of the tubular nut 32 so as to surround the other end side end portion 32b.

Each of the collar-shaped members 36, 36 has an end face (outer end face) 22a1 on the one end 34a side of the wheel bearing 22a, and the wheel bearing 22b.
The other end 34b side end surface (outer end surface) 22b1 is sealed from the outside. The brim-shaped members 36, 36 are provided with a hole 36a into which the front axle 34 is fitted, in a central portion thereof, and are roughly dish-shaped and have an edge portion 36 on the axial center side.
b and the outer edge portion 36c are formed so as to project in the outward direction (the direction away from the bearings 22a and 22b) along the axial direction and have a U-shaped cross section along the central axis. Further, the interval between the outer peripheral surface of the outer edge portion 36 of each of the collar-shaped members 36, 36 and the wheel 16 is formed constant (const.) In the axial direction of the front axle.

In the front axle support structure of the above-described embodiment, the front axle 34 large diameter portion 35 and the tubular nut 32 are extended to the positions adjacent to the wheel bearings 22a and 22b. Only by screwing and tightening the tubular nut 32, the front fork 1 of the front wheel 16
Axial positioning with respect to 0, 10 is possible. Therefore, it is possible to eliminate the conventional axle spacers 14 and 14 and reduce the number of parts to be assembled. Further, since the collar-shaped members 36, 36 can be assembled in a state where they are attached to the front axle 34 and the tubular nut 32, the assemblability is improved.

The front axle 34 and the tubular nut 32 are respectively provided with flanges 34b1 and 32b.
a1 is located in the direction of both ends of the front axle 34. Further, recesses (indicated by reference numeral 12a1 in FIG. 1) corresponding to the flanges 34b1 and 34b2 are formed at the outer edge portions of the mounting holes 12a, 12b of the front forks 10, 10. Accordingly, when the tubular nut 32 is screwed to the front axle 34 and tightened to the front forks 10 and 10, the flanges 34b1 and 32a1 are fitted into the recesses of the mounting holes 12a and 12b, and the front axle 34. The front forks 10, 10 in order to prevent the 34 and the tubular nut 32 from further entering inside.
The positions of the front axle 34 and the front axle 34 are uniquely determined. Therefore, if the positional relationship between the front axle 34 and the front wheel 16 is determined in advance, the center of the front forks 10 and 10 and the front wheel 16 are positioned with respect to the front axle 34 and the tubular nut 32.
It can be done just by tightening. The collar-shaped members 36, 36 are composed of the front axle 34 and the tubular nut 3.
It may be fitted and fixed integrally with 0, or may be a separate body.

Further, in the above-described embodiment, both the front axle 34 and the tubular nut 32 have the same shape as the hexagon socket head cap screw, that is, the hexagon socket 34b2 and the hexagon socket 32.
Although both ends can be rotated with a hexagonal wrench by a2, the present invention is not limited to this, and the shape and nut shape of the other hexagonal bolt head portion similar to that shown in FIG. It may be one of

[0019]

According to the present invention, the number of parts of the front axle formed by screwing the tubular nut at one end is reduced, the assembly is simplified, and the work load can be reduced.

[Brief description of drawings]

FIG. 1 (a) is an enlarged cross-sectional view of a main part of a motorcycle adopting a front axle support structure for a motorcycle of the present invention,
(B) is a side view of the relevant part.

2 is a perspective view of a tubular nut used in the front axle support structure of FIG. 1. FIG.

3 is an enlarged cross-sectional view of a wheel bearing and a collar-shaped member in the front axle support structure of FIG.

FIG. 4 is an enlarged cross-sectional view of a main part of an example of a conventional front axle support structure for a motorcycle.

5A is an enlarged cross-sectional view of a main part of another example of the front axle support structure, and FIG. 5B is a side view of the main part.

[Explanation of symbols]

10, 10 Front fork 16 Front wheel 22, 22a, 22b Wheel bearing 22a1, 22b1 Outer end surface of each wheel bearing 32 Cylindrical nut 34 Front axle 34a, 34b One end and the other end of front axle 35 Large diameter portion 36 Collar member Positions adjacent to A and B wheel bearings 22a and 22b

Claims (1)

[Claims] 1. A cylindrical nut is provided at one end of a front axle that rotatably supports a front wheel via a wheel bearing, and the front axle is provided through the cylindrical nut and a large diameter portion at the other end of the front axle. In a front axle support structure for a motorcycle that fixedly supports a front fork of the motorcycle, the large-diameter portion and the tubular nut are extended to a position adjacent to the wheel bearing, and the large-diameter portion and the cylinder are provided. A front axle support structure for a motorcycle, characterized in that a flange-shaped member is provided at a position adjacent to the wheel bearing of the circular nut, and the side surface of the wheel bearing is sealed from the outside by the flange-shaped member.