JPS6121331Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a resonance point adjusting device for a dynamic damper of a steering wheel.

The so-called flutter phenomenon, in which the steering wheel vibrates in the rotational direction in a relatively limited vehicle speed range due to unbalanced automobile tires, poor uniformity, etc., is known as a very unpleasant vibration.

In order to reduce vibrations caused by such a flutter phenomenon to a non-problematic level, it is also known to provide a steering wheel with a dynamic damper made of an elastic body such as rubber and a mass body.

However, the variation in the spring constant of rubber is generally ±15
%, the resonance point of the dynamic damper changes due to this variation, and there is a risk that it will no longer work effectively to prevent flutter. To eliminate this, it is necessary to make the variation in the spring constant of the rubber extremely small, but this is difficult in practice, so even if there is variation in the spring constant of the rubber, the resonance point of the dynamic damper must be kept constant. You need to try to keep it.

An object of the present invention is to provide a dynamic damper for a steering wheel that has a small axial dimension, that is, can be placed in a flat space without any problem, and can adjust the resonance point.

According to the present invention, a dynamic damper attached to a steering wheel is composed of a short cylindrical elastic body and a mass body coupled to an end face of the elastic body via a support arm, and the dynamic damper is configured to move the elastic body radially inward. A band-shaped tightening piece that can be tightened is arranged around the outer periphery of the elastic body so that the tightening force can be adjusted.

An embodiment of the invention will be described below with reference to the drawings. In FIGS. 1 to 4, the rim 2 of a steering wheel 1 is attached to a steering shaft (not shown) via three spokes 3 arranged in a T-shape. There is. A circular mounting plate 4 is fixed to the center of the rim 2, that is, the place where the spokes 3 gather, and an arm base 6a is fixed to this mounting plate 4 via a short cylindrical rubber piece 5 as an elastic body. Three support arms 6 overlapping the rim 3 from 6a
extend, and weights 7 as mass bodies are supported at the tips of these support arms 6, respectively. Rubber piece 5
The supporting arm 6 and the weight 7 constitute a dynamic damper, which vibrates in the circumferential direction of the rim 2 as the steering wheel 1 rotates. By setting the resonance point to a desired value, the degree of flutter can be reduced.

In order to adjust the torsional spring constant of the rubber piece that is unavoidable due to manufacturing tolerances, assembly tolerances, etc., a band-shaped tightening piece 8 is provided that surrounds most of the periphery of the rubber piece 5, and both ends thereof are bent outward. By tightening the nut 10 that fits into the bolt 9 passed through the leg, the tightening piece 8 contracts in the radial direction, compressing the rubber piece 5 in the radial direction and changing its torsional spring constant. The rubber piece 5 is made so that its torsional spring constant is slightly smaller than the required value, and the tightening piece 8 is later tightened with the bolts and nuts 9, 10 to prevent the resonance of the dynamic dampers 5, 6, 7. It is better to adjust the points to the desired value.

As described above, according to the present invention, by changing the radially inward clamping force of the elastic body by the band-shaped clamping piece, the spring constant of the elastic body can be arbitrarily changed, and the resonance point of the dynamic damper of the steering wheel can be adjusted. Can be adjusted. The space inside the steering wheel where the dynamic damper is arranged is short in the axial direction of the steering wheel, and therefore in the axial direction of the elastic body, but in the present invention, the belt-shaped tightening piece is arranged around the outer periphery of the elastic body. The belt-shaped tightening piece as a resonance point adjusting means can be arranged without any problem in a narrow space along the axis of the elastic body. Furthermore, since the dynamic damper is covered with a pad (not shown), the appearance of the steering wheel will not be damaged. Furthermore, since the spring constant can be adjusted later, there is also the manufacturing advantage that the rubber pieces do not have to be manufactured with great precision from the beginning.

[Brief explanation of the drawing]

1 and 2 are a front view and a side view of the steering wheel, and FIGS. 3 and 4 are a front view and a side view of an embodiment of the resonance point adjusting device for the dynamic damper. DESCRIPTION OF SYMBOLS 1... Steering wheel, 4... Mounting plate, 5... Rubber piece, 6... Support arm, 7... Weight, 8... Band-shaped tightening piece, 9... Bolt, 10...
...Natsuto.

Claims (1)

[Scope of utility model registration request] A dynamic damper attached to a steering wheel is composed of a short cylindrical elastic body and a mass body connected to the end face of the elastic body via a support arm, and has a belt-like tightening mechanism that can tighten the elastic body radially inward. A resonance point adjustment device for a dynamic damper for a steering wheel, characterized in that a piece is arranged on the outer periphery of an elastic body so that the tightening force can be adjusted.