JPH0366193B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering wheel vibration isolating device for a motorcycle or the like, in which a handle is provided with a cover and parts such as a headlight are attached to the cover.

A handle assembly, in which a cover is provided on the handle of a motorcycle, etc., and parts such as a headlight are integrally attached to the cover, is prone to vibrations because the center of gravity is usually located in front of the handlebar attachment part. has a constant natural frequency as .
When this natural frequency matches the engine speed in the engine's normal rotational speed range, resonance occurs, and the handle assembly vibrates violently about the handle attachment portion as a fulcrum. When such resonance occurs, it causes discomfort to the driver who holds the steering wheel, and also causes problems such as making it difficult to read the instruments while driving and causing headlight bulbs to burn out.

The present invention has been made in order to solve such problems, and provides a motorcycle or the like in which a handle is attached to the upper part of the steering shaft and parts such as a headlight are attached to a cover provided on the handle. The present invention is characterized in that a vibration isolating weight is attached to the inside of the cover through an elastic material in front or behind the attachment part.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the steering wheel vibration isolating device for a motorcycle or the like according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, 10 is a main pipe of the vehicle body frame, 12 is a head pipe fixed to the front end of the main pipe 10, 14 is a front fork that supports the front wheel 16, and 18 is a head pipe fixed to the upper part of the front fork 14. A steering shaft 12 is pivotally supported, and 20 is an engine attached to the vehicle body frame. The handle 22 is attached to the upper part of the steering shaft 18 via a bracket 24.

In FIGS. 2 and 3, the detailed structure of the vicinity of the handle 22 is shown. In FIG. 2, 26 is a bearing interposed between the head pipe 12 and the steering shaft 18, 28 is a rubber damper, and 30 and 32 are the steering shaft 1.
This is a nut for attaching the rubber damper 28 to the upper part of the rubber damper 28. The lower end 34 of the bracket 24 is held under pressure by a rubber damper 28, and the handle 22 is attached to the upper end 36 thereof. That is, as shown in FIGS. 2 and 3, a stay 3 is provided on the bottom surface of the handle 22.
8, 38 are fixed, and this stay 38 is fixed to the upper end 36 of the bracket 24 with bolts 40, 40. The positions of the bolts 40, 40 become the attachment portions of the handle 22 to the steering shaft 18.

The handle 22 has a cover 42 that protrudes forward.
will be provided. Instruments 44 are attached to the upper center of this cover 42, and a headlight 46 is attached to the front end. The instruments 44 include a speedometer 4
8. It is composed of a fuel gauge 50. Further, the turn signals 54, 54 are attached to the cover 42 via stays 56, 56, and the brake lever 58 is attached near the grip 60 of the handle 22. The parts such as the headlight 46 and the brake lever 58 attached to the cover 42 are located forward of the vehicle from the mounting position A-A of the handle 22, so the center of gravity of the handle assembly made up of these parts is at the mounting position A-A. Exists ahead of A.

A vibration isolating weight 64 is attached to the inside of the cover 42 in front of the attachment position A-A of the handle 22 via an elastic member 66 made of urethane foam, thereby forming a vibrating body 62.

The vibrating body 62 is a dynamic vibration absorber, and the vibration isolating weight 64 is set to a frequency that cancels the resonance of the handle assembly caused by the vibration of the engine 20 in the normal engine rotational speed range (for example, 1000 rpm to 10000 rpm).
The weight of the elastic material 66 and the spring constant of the elastic material 66 are determined.

In the embodiment of the present invention configured as described above, when the engine 20 reaches the normal rotational speed range, the vibrations of the engine 20 are transmitted to the steering wheel via the vehicle body frame 10, head pipe 12, steering shaft 18, and bracket 24. transmitted to the assembly.

Since the center of gravity of the handle assembly is located in front of the mounting position A-A, the handle assembly vibrates up and down with the mounting position A-A as a fulcrum and has a constant natural frequency. When the normal rotational speed of the engine matches this natural frequency, resonance occurs, but the vibrating body 62, which is a dynamic vibration absorber, vibrates inside the cover 42 at a frequency that cancels out the resonance and absorbs the vibration energy, so the handle assembly vibration can be suppressed. Therefore, according to this embodiment, the driver does not feel uncomfortable due to the vibration of the steering wheel 22, and the driver does not have to worry about the instruments 44 while driving.
The numbers may become difficult to read due to vibration, or
There's no such thing as a headlight bulb going out.

In the embodiment described above, the vibrating body 62 was placed in front of the mounting position A-A of the handle 22;
A similar effect can be expected even if it is placed behind -A. Further, the present invention can be applied not only to motorcycles but also to tricycles.

As explained above, the vibration isolating device for a motorcycle or the like according to the present invention is applicable to a motorcycle or the like in which a handle is attached to the upper part of a steering shaft and parts such as a headlight are attached to a cover provided on the handle. The present invention is characterized in that a vibration isolating weight is attached to the inside of the cover through an elastic material in front or behind the attachment part.

Therefore, even if the steering wheel assembly generates resonance in the engine's normal rotation range, the vibrating body installed inside the cover acts as a dynamic vibration absorber and suppresses the vibration of the steering wheel assembly, so that the driver holding the steering wheel does not feel uncomfortable. I never feel that. Furthermore, problems such as instruments becoming difficult to read while driving or headlight bulbs burning out will no longer occur.

[Brief explanation of drawings]

FIG. 1 is a side view of a motorcycle to which an embodiment of the present invention is applied, FIG. 2 is a sectional view of a main part of an embodiment of the present invention, and FIG. 3 is a main part of an embodiment of the present invention. FIG. 2 is a plan view partially shown in cross section. 18... Steering axis, 22... Handle, 42...
Cover, 46...Headlight, 64...Vibration-proofing weight, 66...Elastic material.

Claims (1)

[Claims] 1. In a motorcycle, etc., in which a handle is attached to the upper part of the steering shaft and parts such as a headlight are attached to a cover provided on the handle, an elastic material is inserted inside the cover in front or behind the attachment part of the handle. A handle vibration isolating device for a motorcycle, etc., characterized in that a vibration isolating weight is attached to the handlebar.