JPH06321159A - Bar handle vibration control device for motorcycle - Google Patents

Abstract

PURPOSE:To mount a fixed weight and a floating weight on both ends of a bar handle, prevent a rotating area generating a large resonance by the combination of the fixed weight and the floating weight, and provide a bar handle vibration control device for motorcycle comfortable in the whole rotating area. CONSTITUTION:A floating weight 8 held by an elastic body 9 and a fixed weight 11 are arranged and housed in the inside of a cup-like cover 6, a mounting bolt 7 is inserted thereto, and the top end of the mounting bolt 7 is fastened to a nut 5 embedded in the end part of a bar handle 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar handle vibration isolator for motorcycles.

[0002]

2. Description of the Related Art In a motorcycle, a bar handle extending to the left and right is attached to the upper end of a front fork, and grips are attached to both ends of the bar handle so that a rider can grip the left and right grips for steering operation. is there. Bar handles are usually made of steel tubing of suitable thickness and strength.

[0003] A motorcycle drives by driving the rear wheels of the engine, and the engine generates vibration by driving, and although the engine is provided with a vibration isolation device, the vibration transmitted to the vehicle body cannot be completely prevented. When the engine vibration is transmitted to the bar handle and the engine vibration and the natural frequency of the bar handle match, the bar handle resonates and the vibration becomes large, and the vibration is transmitted to the gripper's hand. It is uncomfortable.

For this reason, weights are fixed to both ends of the bar handle, and the natural frequency of the bar handle is changed to shift the resonance point. Also, there is a bar handle in which weights floated by elastic bodies are attached to both ends. See, for example, JP-A-62-39385.

[0005]

The engine of a motorcycle has a wide range from low rotation speed to high rotation speed. A bar handle having fixed weights attached to both ends has a disadvantage that a resonance point is formed in a low engine speed region. Further, the bar handle having the floating weights attached to both ends has a disadvantage that a resonance point is formed in a middle and high rotation range.

In view of the above point, the present invention has a fixed weight and a floating weight attached to both ends of a bar handle to prevent a rotation range in which a large resonance occurs in a combination of the fixed weight and the floating weight,
The purpose of the present invention is to obtain a bar handle anti-vibration device for motorcycles that is comfortable in all rotation ranges.

[0007]

In order to achieve the above object, a bar handle vibration isolator for a motorcycle according to the present invention comprises:
Inside the cup-shaped cover, accommodate the floating weight and the fixed weight held by the elastic body side by side, insert the mounting bolt, and tighten the tip of the mounting bolt to the nut embedded in the end of the bar handle. There is something I did.

In the rotation range where the fixed weight resonates,
The floating weight works to suppress resonance. Further, in the rotation range in which the floating weight resonates, the fixed weight deviates from the resonance point and acts to suppress the resonance. In this way, it is possible to prevent unpleasant large vibrations from occurring throughout the engine rotation. Further, the fixed weight and the floating weight, including the cover, can be assembled with one mounting bolt.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. The bar handle 1 is attached to the upper bracket 3 of the front fork 2 in the vicinity of the center and extends in the left-right direction. Grips 4 are attached to both ends so that the rider can easily hold the grips. A nut 5 is embedded and welded inside the end portion of the bar handle 1 made of steel pipe. A mounting bolt 7 is inserted into the center of the cup-shaped cover 6. Then, the annular floating weight 8 is held by the elastic body 9, and the spacer 10 of the elastic body 9 is passed through the mounting bolt 7. In addition, fixed weight 1
The mounting bolt 7 is passed through the core hole 12 of 1. In addition, 13, 1
Numerals 4 and 15 are washers.

FIG. 3 shows the vibration level generated according to the number of revolutions of the engine. Line A shows the amount of vibration by the fixed weight 11, and line B shows the amount of vibration by the floating weight 8. The lower the position, the greater the vibration and the more uncomfortable. On the line A, there is a portion where the vibration becomes large in the low rotation range, and on the line B, there is a portion where the vibration becomes large at the portion where the middle rotation changes to the high rotation region. When the fixed weight 11 and the floating weight 8 are used together,
The amount of vibration is as shown by the line C. The portion of the fixed weight 11 where the vibration is large acts to cancel out the vibrating weight 8, and the portion of the floating weight 8 where the vibration is large is hit by the proper weight 11. It works so as to turn it off so that no rotation range is generated in which a large vibration that is uncomfortable is generated in all rotation ranges.

[0011]

As described above, since the present invention is configured as described above, the fixed weight 11 will resonate by attaching the fixed weight 11 and the floating weight 8 to both ends of the bar handle 1. In the rotation range, the floating weight 8 acts to cancel out, and in the rotation range where the floating weight 8 tries to resonate, the fixed weight 11 acts to cancel out, resulting in less vibration in the entire rotation range of the engine. It is possible to make the bar handle 1 comfortable. And, the cover 6 for protecting the fixed weight 11 and the floating weight 8 can be attached / detached with one mounting bolt 7,
It can be made compact and inexpensive, has a large vibration-proof effect, and can reduce variations in spring constant.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a perspective view of the entire bar handle showing an embodiment of the present invention.

FIG. 3 is a graph showing the vibration level of the present invention.

[Explanation of symbols]

 1 Bar handle 5 Nut 6 Cover 7 Mounting bolt 8 Floating weight 9 Elastic body 11 Fixed weight

Claims (1)

[Claims] 1. A floating weight and a fixed weight held by an elastic body are housed side by side inside a cup-shaped cover, and a mounting bolt is inserted therethrough, and a tip of the mounting bolt is attached to a nut embedded in an end portion of a bar handle. A bar handle anti-vibration device for a motorcycle, which is characterized by being fastened.