JPH0712835B2 - Anti-vibration device for handlebar - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a vibration isolation device for a handlebar attached to a vehicle such as a motorcycle.

[Prior art]

A handle of a motorcycle or the like is generally formed in a bar shape. If such a handlebar resonates with the vibration of the vehicle body and violently vibrates the grip, the driver may feel uncomfortable. As a countermeasure against this, an elastic material such as rubber or resin is attached to the outer end of the handlebar. There is a structure in which a weight is attached via the, and the vibration mode of the handlebar is changed by this, so that the amplitude is minimized in the grip portion (Japanese Utility Model Laid-Open No. 59-91985 etc.).

However, the elastic body such as rubber and resin described above deteriorates over time due to the influence of ultraviolet rays, rainwater, etc. and loses elasticity, so that the spring constant increases and the initial vibration isolation effect decreases. There is.

[Object of the Invention]

An object of the present invention is to provide an anti-vibration device for a handlebar that enables the initial anti-vibration effect to be exhibited by a simple correction mechanism even if the spring constant of the elastic body changes over time as described above. It is in.

[Structure of Invention]

According to the present invention to achieve the above object, a weight is attached to an outer end portion of a handlebar fixed to a vehicle having a vibration source via an elastic body, and the weight is inserted inside or surrounds the outer side of the elastic body. The partially overlapped rigid body is attached to the weight, and the rigid body can be moved and adjusted toward the weight as the elastic body deteriorates. .

〔Example〕

FIG. 1 is a front view of a handle portion of a motorcycle, in which 1 is a head tube of a vehicle body frame, 2 and 2 are front forks for supporting a front wheel (not shown) at a lower end, and 3 and 3 are handle bars. The handlebars 3, 3 are fixed to the upper surface of the upper bracket 4, and the upper bracket 4 and the lower bracket 5 are
The front forks 2, 2 are fixed to both ends, respectively, and are rotatable left and right around the head tube 1 via a steering shaft 6 fixed in the center.

A grip portion 7 made of resin or rubber is attached to the outer periphery of the outer end portion of the handlebar 3. Further, as shown in detail in FIGS. 2A and 2B, rubber is provided as an anti-vibration device of the present invention on the outer end side thereof. Alternatively, a weight 9 is attached via an elastic body 8 made of an elastic resin. At the center of the elastic body 8, a stud bolt 10 is provided as a rigid body, which penetrates the elastic body 8 so as to partially overlap the supporting direction of the weight 9. The stud bolt 10 is screwed into the weight 9, and the overlap amount 1 with respect to the elastic body 8 can be changed to an arbitrary length by screwing the stud 9 forward and backward. That is, the resonance frequency of the vibration isolator including the elastic body 8, the weight 9 and the like can be largely changed only by slightly adjusting the overlap amount l.

In the vibration isolator described above, when the vehicle is a new vehicle, the overlap amount 1 of the stud 10 (rigid body) with respect to the elastic body 8 is set to a large value as shown in FIG. 2A, and the resonance frequency in this state is set to the grip portion 7. On the other hand, the overlap amount l is set so as to minimize the vibration (amplitude). When the elastic body 8 is gradually deteriorated due to the influence of ultraviolet rays, rainwater and the like as the vehicle is used, the spring constant becomes large, so that the resonance frequency based on the initially set overlap amount 1 also becomes low and the vibration damping effect is lowered. To go.

When such changes are observed, the result is shown in FIG. 2B.
If the stud bolt 10 is moved to the weight 9 side and the overlap amount l with respect to the elastic body 8 is reduced as shown in FIG. The anti-vibration effect of can be exhibited. Therefore, regardless of the change in the spring constant of the elastic body 8, a good vibration damping effect can be constantly exerted.

Further, since it is only necessary to slightly move and adjust the studs 10, the vibration-damping device including the elastic body 8 and the weight 9 can be made extremely compact without unnecessarily increasing the size thereof.

FIGS. 3A and 3B show another embodiment, in which an annular nut 11 is used as a rigid body instead of the stud bolt 10 and is screwed from the outside of the elastic body 8 and the weight 9. It was done. This annular nut 11 is also the above-mentioned stud
Similar to 10, the elastic body 8 is partially overlapped with respect to the weight supporting direction, and the overlap amount 1 can be adjusted. Therefore, it is possible to obtain the same effect as that of the embodiment shown in FIGS.

In addition, in the above-described embodiment, the case of the handlebar of the motorcycle has been described, but the present invention is also applicable to the handlebar of a vehicle such as an agricultural machine such as a motorcycle or a cultivator.

〔The invention's effect〕

As described above, according to the present invention, the weight is attached to the outer end portion of the handlebar fixed to the vehicle having the vibration source via the elastic body made of rubber or elastic resin, and A rigid body with a part of it inserted or surrounded to the outside was attached to the weight, and the rigid body was allowed to move and adjust toward the weight side. Even if it changes over time, the initial vibration damping effect can be easily exerted by correcting the overlap amount. Further, since the adjustment rigid body is only required to be slightly moved and adjusted, it is possible to make an extremely compact structure without unnecessarily increasing the size of the vibration damping device including the elastic body and the weight.

[Brief description of drawings]

FIG. 1 is a front view showing a handle portion of a motorcycle provided with a vibration isolation device of the present invention, and FIGS. 2A and 2B are sectional views showing the vibration isolation device provided at an end portion of a handlebar. Shows the state set before the elastic body deteriorates, and FIG. 2B shows the state set after the elastic body deteriorates. 3A and 3B are sectional views showing another embodiment shown in correspondence with FIGS. 2A and 2B. 3 ... Handlebar, 8 ... Elastic body, 9 ... Weight, 10 ... Implant bolt (rigid body), 11 ... Annular nut (rigid body).

Claims (1)

[Claims] 1. A weight having a weight attached to an outer end portion of a handlebar fixed to a vehicle having a vibration source via an elastic body made of rubber or elastic resin, which is inserted into or outside the elastic body. An anti-vibration device for a handle bar, wherein a rigid body, a part of which is overlapped with, is attached to the weight, and the rigid body is movable and adjustable toward the weight.