JPH0732322Y2 - Steering anti-vibration device - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a steering anti-vibration device, and more particularly, by providing a dynamic damper in the middle of the steering shaft and in the vicinity thereof, the vehicle is running or idling. Resonance of steering in
The present invention relates to what is called a steering shake prevention.

[Conventional technology]

In this type of steering anti-vibration device, a conventional one is known in which a dynamic damper is attached to the tip of the steering shaft in the horn pad of the steering to control the vibration of the steering shake (for example, in practice). (See JP-A-55-149460).

On the other hand, in recent years, as the traveling speed of vehicles has increased, the demand for safety at the time of collision has increased, and the number of vehicles equipped with airbags is increasing. Space is used, so in vehicles equipped with airbags, it is necessary to secure a space for the airbag device in the center of the steering wheel, and a dynamic damper as a steering anti-vibration device is installed at the tip of the steering shaft. It became impossible.

Therefore, even in a vehicle equipped with an air bag, it is possible to achieve vibration isolation of the steering, that is, as a dynamic damper is attached to the steering system other than the tip portion of the steering shaft, the lower part of the steering column tube is used. It is known that a dynamic damper is attached to the supporting open end of the above (see, for example, Japanese Utility Model Laid-Open No. 58-61674).

[Problems to be solved by the device]

In the conventional steering anti-vibration device, in which the dynamic damper is attached to the tip of the steering shaft in the steering horn pad, the dynamic damper is attached directly to the steering shaft and at the part where the swing of the steering shaft is the largest. Therefore, the anti-vibration effect of the steering wheel can be expected most, but in a vehicle equipped with an airbag accompanying the speeding up of the vehicle, it is necessary to secure a space necessary for the airbag device in the central portion of the steering wheel. There was a problem that it was impossible.

Also, the one with a dynamic damper attached to the lower support open end of the steering column tube can secure the space required for the airbag device in the center of the steering wheel, but the dynamic damper is attached to the steering shaft. Since the steering shaft is not directly mounted and the swing width of the steering shaft is not so large, there is a problem that the vibration damping effect of the steering cannot be expected.

The present invention solves the above-mentioned problems of the prior art. By connecting the intermediate portion of the steering shaft with a joint, the swing can be increased near the joint when the steering resonates, and By installing a dynamic damper on the steering shaft near the steering wheel, the resonance of the steering can be effectively prevented, and by installing a dynamic damper on the middle part of the steering shaft, the air can be removed from the center of the steering wheel. An object of the present invention is to provide a steering anti-vibration device capable of ensuring a necessary space for a bag device.

[Means for Solving the Problems]

In order to achieve the above object, in the steering anti-vibration device of the present invention, the main steering shaft and the sub steering shaft rotatably supported by the main steering column and the sub steering column supported by the bracket are A main damper and a sub steering column are connected by a joint, and a dynamic damper is installed near the joint.

[Action]

In the steering anti-vibration device configured as described above, the main steering shaft and the sub steering shaft, which are rotatably supported by the main steering column and the sub steering column, are connected by a joint between the main and sub steering columns. Since the main and sub steering shafts are bendable by the joints that are the connecting portions, the bending mode of the conventional steering shaft shown in FIG. 5 and the present invention shown in FIG. As is clear from the comparison with the bending mode of the steering shaft having the joint in the intermediate portion, the swing range at the joint portion of the steering shaft can be large when the steering resonates. However, in the present invention, since the dynamic damper is installed in the vicinity of the joint portion of the steering shaft where the swing becomes large at the time of resonance, the dynamic damper has a great effect of absorbing the vibration, and as a result, the steering Resonance can be effectively prevented.

Moreover, since the dynamic damper is installed in the middle portion of the steering shaft, it is possible to secure a space necessary for mounting the airbag in the central portion of the steering wheel.

〔Example〕

An embodiment will be described with reference to the drawings. Reference numeral 1 is a main steering shaft, which is rotatably supported at both ends of a main steering column 2 via ball bearings 3 and has a steering wheel at its tip. 4 is mounted, and the main steering column 2 is supported by a column support bracket 7 mounted on a support bar 6 via a column mount 5. A sub-steering shaft 9 is connected to a base end of the main steering shaft 1 by a universal joint 8. The sub-steering shaft 9 is rotatably attached to both ends of a sub-steering column 10 via ball bearings 11, 11. It is pivotally supported. Further, the base end of the auxiliary steering column 10 is attached to the dash panel 12, and the tip end thereof is supported by the pedal mount bracket 14 via the column mount 13. Further, a dynamic damper 15 is mounted on the main steering shaft 1 in the vicinity of the universal joint 8 at the base end thereof by a fixing means such as welding, and the dynamic damper 15 has an annular mass body 16 and an elastic body 17 ... The ring-shaped base plate 18 fixed via the plurality of bolts 19 is fixed to the circular substrate 20.

The elastic body 17 supporting the mass body 16 is effective in arranging an odd number in the radial direction of the main steering shaft 1 in order to minimize the change of the resonance frequency by the main steering shaft 1. In order to make the body as small as possible and make the resonance point as low as possible, it is essential to make the total elastic springs 17 ... Total shear spring constant as small as possible.
For this purpose, it is effective to dispose about three elastic bodies 17. In addition, the dynamic damper 15 has a large swing when the steering resonates.
As long as it is near the joint 8 of 9, the primary and secondary steering shafts 1 and 9 will have the desired effect regardless of whether they are mounted on the main steering shaft 1. It is effective.

[Effect of device]

The present invention is configured as described above, and since the intermediate portion of the steering shaft composed of the main steering shaft and the sub steering shaft is connected by the joint, the swing range at the time of steering resonance The dynamic damper is installed in the vicinity of the joint portion of the steering shaft where the vibration becomes large. Therefore, the dynamic damper has a great effect of absorbing the vibration, and as a result, the resonance of the steering can be effectively prevented. Moreover, since the dynamic damper is installed in the middle part of the steering shaft, it is possible to secure the space required for installing the airbag in the center part of the steering wheel. Or in the idling area Kicking is capable of effectively preventing the resonance of the steering.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional side view of a steering anti-vibration device, FIG. 2 is a vertical sectional side view of a dynamic damper, FIG. 3 is a front view of the dynamic damper, and FIG. FIG. 5 is an explanatory view showing a bending mode of a steering shaft having a joint in an intermediate portion, and FIG. 5 is an explanatory view showing a bending mode of a conventional steering shaft. 1 …… Main steering shaft 2 …… Main steering column 7,14 …… Bracket, 8 …… Joint 9 …… Sub steering shaft 10 …… Sub steering column 15 …… Dynamic damper

Claims (1)

[Scope of utility model registration request] 1. A main steering shaft and a sub steering shaft, which are rotatably supported by a main steering column and a sub steering column supported by a bracket, are connected by a joint between the main and sub steering columns, and A steering anti-vibration device in which a dynamic damper is installed near the joint.