JP2001151183A - Length-variable swing arm for two wheeler rear wheel suspension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To vary the whole length of one swing arm so that a rear wheel shaft is longitudinally movable in the backward extension of the rear wheel shaft in tuning up for ensuring direct advance stability or the forward contraction thereof according to tuning up, maintenance or the like in the use of a two wheeler vehicle for competition, particularly, in a small-sized car body, a bicycle with prime motor having a minor diameter tire or the like and to provide the function such that the height is constant even if the whole length of the swing arm is varied. SOLUTION: The arm parts 2 and 3 and rear wheel shaft receiving parts 4 and 5 of a swing arm body 1 are divided, the rear wheel receiving parts 4 and 5 are longitudinally slid and fastened, whereby the whole length of the swing arm 1 can be varied. Height regulating brackets 10 and 11 are replaced so that the height is not changed when the length is varied, whereby the height can be regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a function of separating a swing arm for a rear wheel suspension of a motorcycle into an arm body and a rear wheel bearing portion, and sliding the rear wheel bearing portion by using a fastening method such as a screw to change the overall length. The present invention relates to a swing arm having:

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, a conventional swing arm (B) for a rear wheel suspension of a motorcycle is a fixed type having a welded structure including a genuine part of a manufacturer and a commercially available part for tuning up. Can move up and down on an arc through a suspension (A) combining a coil spring and an oil damper with the mounting support shaft (F) as a fulcrum. It does not have an up / down variable function to adjust the vehicle height.

[0003]

In a conventional swing arm for a rear wheel suspension of a motorcycle, when the vehicle is used for a competition or the like, and particularly when the vehicle is used in a straight line such as a small body, a motor-driven bicycle having a small diameter tire, and the like. Extend the rear axle rearward for tuning up to ensure stability, etc.
In addition, since it does not have the function of contracting forward due to tuning up or maintenance, there is a problem that the swing arm itself must be replaced with one having a different overall length. In addition, there is no vehicle height adjustment function for each length of the swing arm that has been replaced, so that the vehicle height must be adjusted by replacing a suspension or the like that combines a coil spring and an oil damper. was there.

An object of the present invention is to make it possible to change the axial position of the rear wheel axle in the front-rear direction without replacing the swing arm itself, and to further change the total length of the swing arm in the front-rear direction by interposing a bracket for adjusting the vehicle height. It is another object of the present invention to be able to maintain the vehicle height at a constant level, and to easily and easily change and adjust the distance between the front and rear wheels, the diameter of the rear wheel, and the vehicle height by combining the above two points.

[0005]

In order to achieve the above-mentioned object, in the swing arm of the present invention, the left and right arms of the swing arm body have a hollow cross section of a pipe shape (FIG. 3).
E), by sliding and inserting a rear wheel bearing portion and a variable length portion (FIG. 3F) into the hollow portion, the total length of the swing arm can be changed in the front-rear direction.

Further, in order to easily fix the rear wheel bearing portion which is slidably movable, screw insertion holes are provided in the left and right arms of the swing arm body (FIG. 3A), and screw holes are provided in the rear wheel bearing portion (FIG. 3B). Are provided at a fixed pitch, and by screwing, it is possible to easily change the length of the left and right arms by the fixed pitch regardless of who performs the variable work.

[0007] Furthermore, since the bracket for adjusting the vehicle height can be fastened by means of the screw holes (FIG. 4C) provided in the upper part of the rear wheel bearing, the bracket for adjusting the vehicle height can be easily exchanged and the vehicle height can be adjusted accordingly. It was made easy.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 shows an embodiment of the present invention in a state in which screw fastening of each element is not performed.

The swing arm body (1) shown in FIG. 1 has a support shaft (6) for mounting to a vehicle body frame, an arm (7) opened diagonally to the left and right, and a left and right hollow cross section having a variable length function. This is a welding structure having a general shape including a support arm (8) for fixing the parallel arms (2, 3) in parallel and horizontally, and a bracket (9) for reinforcing strength.

However, as shown in FIG. 1, the rear wheel bearings (4, 5) are not fixed to the rear end portions of the left and right parallel arms (2, 3) by welding or the like, and the hollow arms are left as they are. In addition, since the left and right arms are fixed in parallel, the rear wheel bearings (4, 5) can be inserted into the hollow portion, and can be slid while maintaining the parallel state, and can be mounted so as to be variable.

The embodiments shown in FIGS. 2, 3 and 11 show the details of the fastening portion of the variable portion of the present invention. The arm (3) is provided with screw insertion holes (A) for fastening the rear wheel bearing portion (5) on the left and right side surfaces and the lower surface thereof, and the rear wheel bearing has the same pitch as the screw insertion hole provided on the arm. A plurality of screw holes (B) are provided in a straight line at a fixed pitch depending on which position of the plurality of screw holes (B) is selected when fastening screws using the screw (D). Arm length can be changed.

The embodiment shown in FIGS. 2, 3 and 11 is a form in which the fixed pitch can be easily changed by screwing and the strength is secured, but the change and the fastening method are not limited to this. Absent.

The embodiments shown in FIGS. 7, 8, 9 and 10 are considered to be similar fastening methods as described in the claims. For example, it is also possible to provide a straight elongated hole in the arm (FIG. 7A) and a screw hole (FIG. 7B) in the rear wheel bearing, or to slit the arm into a clamp shape (FIG. 8A).
By inserting the rear wheel bearing, it is also possible to fasten with a band-shaped fastener (FIG. 8B) from the outer periphery,
Alternatively, the inner surface of the arm may be a female screw (FIG. 9A), and the outer surface of the rear wheel bearing portion may be a male screw (FIG. 9B). Furthermore, a flat plate-shaped arm (1
8) and the same shape rear wheel bearing (19) as
It is also possible to change the length of the entire arm by screwing.

The embodiment shown in FIG. 4 shows in detail a mounting portion of a vehicle height adjusting bracket (10) fastened to the rear wheel bearing portion (5) of the present invention by screws. There are several types of brackets for adjusting the vehicle height, which are different in height from the screw part (Fig. 4G) for supporting the suspension (A in Figs. 5 and 6) and the height from the upper surface of the rear wheel bearing. And height balance relationship,
It is possible to easily change the vehicle height depending on the wheel diameter size, user's preference, and the like.

By changing the bracket for height adjustment in the direction in which the swing arm extends, and replacing the bracket for height reduction in the direction in which the swing arm contracts, the vehicle height can be maintained at a constant height without replacing the suspension itself. It is possible to keep.

[0016]

As is apparent from the above description, according to the present invention, the swing arm body and the rear wheel bearing can be slidably changed, so that the swing arm length according to the situation can be easily selected. Expensive swingarms are purchased from time to time, and the swingarm body (B in FIGS. 5 and 6), rear wheels (C in FIGS. 5 and 6), and rear wheel hub (D in FIGS. 5 and 6) are used for replacement work. ), It is not necessary to remove and reassemble the peripheral parts such as the brake shoes (E in FIG. 6). The present invention can sufficiently respond to requests for use in competitions or the like, especially for tuning-up or the like for securing straight running stability of a small-sized vehicle or a motor-driven bicycle having a small-diameter tire.

Further, the swing arm has a height adjusting function via vehicle height adjusting brackets (10, 11).
Even if the total length of the swing arm is variable, the vehicle height can be kept constant without exchanging the suspension (A in FIGS. 5 and 6) itself that supports the swing arm with another of a different length.

The swing arm is expected to be applied to not only motorcycles with engines such as motorcycles and motorbikes but also bicycles with suspensions such as mountain bikes and other industrial equipment using a swing arm mechanism.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the entire configuration of the present invention in a state where screws are not fastened.

FIG. 2 is a detailed perspective view showing a state where an arm portion and a rear wheel bearing portion are fastened with screws.

FIG. 3 is an exploded perspective view showing an arm portion and a rear wheel bearing portion in detail.

FIG. 4 is an exploded perspective view showing a rear wheel bearing portion and a vehicle height adjusting bracket in detail.

FIG. 5 is a perspective view showing a swing arm of a general two-wheeled motorcycle using a suspension and peripheral components thereof.

FIG. 6 is a plan view showing a swing arm of a general motorcycle using one suspension and its peripheral parts.

FIG. 7 is a perspective view showing a fastening method according to another embodiment.

FIG. 8 is a perspective view showing a fastening method according to another embodiment.

FIG. 9 is a perspective view showing a fastening method according to another embodiment.

FIG. 10 is a perspective view showing a fastening method according to another embodiment.

FIG. 11 is a cross-sectional view showing a cross section in a state where the arm portion and the rear wheel bearing portion are fastened with screws by cutting along a portion shown in FIG. 2H.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Swing arm main body 2 Right arm 3 Left arm 4 Right rear wheel bearing part 5 Left rear wheel bearing part 10 Bracket for left vehicle height adjustment 11 Bracket for right vehicle height adjustment

Claims (5)

[Claims] The left and right rear wheel bearings (4, 5) are inserted into the pipe-shaped hollow portions at the rear ends of the left and right arms (2, 3) of the swing arm body (1). A variable-length swing arm for motorcycle rear-wheel suspension, in which the rear wheel bearing slides to change the overall length of the swing arm. 2. The variable length for a rear wheel suspension of a motorcycle according to claim 1, wherein screw insertion holes (FIG. 1A) for screwing left and right rear wheel bearings are provided on the left and right side surfaces and lower surface of the left and right arms of the swing arm body. Swing arm. 3. A plurality of screw holes are provided linearly on the left and right side surfaces and the lower surface of the left and right rear wheel bearing portions (FIG. 1B), and the length of the swing arm body can be varied through the screw insertion holes of the left and right arms. The variable length swing arm for a rear wheel suspension of a motorcycle according to claim 1, wherein the variable length swing arm is designed so as to be able to be fastened with a screw (Fig. 2D). 4. A screw hole (FIG. 1C) for screwing a suspension support bracket (hereinafter referred to as a vehicle height adjustment bracket (10, 11)) on an upper surface of the left and right rear wheel bearings. The variable length swing arm for a rear wheel suspension of a motorcycle according to claim 1, wherein the bracket for adjusting the vehicle height can be easily replaced. The left and right arms of the swing arm main body and the rear wheel bearing portion have a sliding function, and the overall length can be changed by screw fastening or a similar fastening method,
The vehicle height adjustment can be easily performed by replacing the vehicle height adjustment bracket by screwing.
3. A variable length swing arm for a motorcycle rear wheel suspension according to claim 3.