JPS644615Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration reduction device for an automobile steering device.

In automobiles, especially diesel locomotives, the vibrations of the engine are large, and the vibrations are transmitted to the steering wheel, causing discomfort to the driver who grips the steering wheel.

In order to reduce such vibrations, it is known to install a dynamic damper with a mass body and an elastic body on the steering column, but it is possible to install a dynamic damper with a mass body and an elastic body on the steering column. It is practically difficult to install.

The present invention overcomes these difficulties by attaching approximately 1/2 inch of the surrounding area to the column tube on the steering wheel side of the mounting member that is closer to the steering wheel among the mounting members that attach the column tube of the steering device to the vehicle body. 4, and install a dynamic damper equipped with a rubber elastic body and a mass body.

1 to 3, a steering shaft 2 having a steering wheel 1 at one end is rotatably supported in a column tube 3 concentrically surrounding the steering shaft 2. There is. The column tube 3 is attached to the vehicle body by means of steering supports as attachment members at both ends thereof, but only the support 4 closer to the steering wheel 1 is shown in the figure.

Regarding support 4, the side closest to the steering wheel 1, especially support 4 and the hot bracket 5.
A dynamic damper 6 is mounted on the column tube 3 so as to partially surround the column tube 3. The mounting bracket 7 for attaching the damper 6 to the column tube 3 has a circular arc portion 7a extending over an angular range of 90 degrees or more along the circumference of the column tube 3, and a mounting bracket 7 that extends outward from both ends of the circular arc portion 7a at approximately right angles to each other. Extending leg portions 7b, 7
b', and the arcuate portion 7a is welded to the column tube 3. The damper board 8 consists of an arcuate portion 8a extending parallel to the arcuate portion 7a of the bracket 7 at intervals, and leg portions 8b, 8b' which are fastened to the leg portions 7b, 7b' by bolts 9, 9'. Rubber strip 10,1 as body
0' is vulcanized and bonded at the base end, and a mass body 11 having an approximately right triangular cross section is similarly vulcanized and bonded to the tip of these rubber strips 10, 10' at its oblique side. The spring constants of the rubber strips 10, 10' and the mass of the mass body 11 are set to such a value that the amplitude of resonance of the steering device is reduced. Note that bolts 9 and 9' are attached to column tube 3.
It plays the role of a stopper that restricts the movement of the mass body in a plane perpendicular to the axis of the mass body. In order to prevent noise from being generated when the mass body 11 hits the bolts 9, 9', rubber is vulcanized and bonded to the ends of the bolts 9, 9' located below the mass body 11. . Furthermore, in order to restrict the movement of the mass body 11 in the axial direction of the column tube 3, a stopper piece 12 is formed on the damper board 8 and faces the end face of the mass body 11 at a distance. Note 1
3 is a column cover that surrounds the end of the column tube 3 including the support 4 and the bracket 5;
The dynamic damper 6 is also surrounded by this cover 13.

Figure 4 shows the vibration level Vl of the vertical vibration at the steering wheel, that is, the vibration in the direction perpendicular to its axis, with respect to the engine speed N. The solid line is for the case without a dynamic damper, and the broken line is for the dynamic damper. It shows the progression of vibration level in the case with a damper.

In this way, according to the present invention, by providing the dynamic damper 6, the vibration of the steering device is reduced not only in the vertical direction but also in the left-right direction and the front-back direction (axial direction). can reduce the discomfort caused to In addition, dynamic damper 6
can be arranged compactly using approximately 1/4 of the space around the outer periphery of the column tube 3, so even if other members are arranged around the outer periphery of the column tube 3, they will not interfere with other members. Also, since the mass body 11 is mounted offset from the center of the column tube 3, the movement of the rubber strips 10, 10' can be used as shear, so when the resonance frequency is low, it is possible to reduce the spring constant. Become. Furthermore, the damper 6 is located on the steering wheel side of the support 4, and the column cover 13 is necessary in any case.
Since the damper 6 is covered by a damper 6, there is an advantage that the appearance is not damaged by the attachment of the damper 6.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the - line, Fig. 3 is an enlarged view of the main part of Fig. 1, and Fig. 4 is a steering device. FIG. DESCRIPTION OF SYMBOLS 1... Steering wheel, 3... Column tube, 4... Mounting member, 6... Dynamic damper, 10, 10'... Rubber elastic body (rubber strip), 11... Mass body.

Claims (1)

[Scope of utility model registration request] Among the mounting members that attach the column tube of the steering device to the vehicle body, a dynamometer equipped with an elastic body and a mass body is attached to the column tube on the steering wheel side of the mounting member that is closer to the steering wheel. In a vibration reduction device for a steering device in which a dynamic damper is attached, the dynamic damper is comprised of a rubber elastic body attached diagonally below the outer periphery of the column tube, and a rubber elastic body attached to the tip of the rubber elastic body of the column tube. A vibration reduction device for a steering device, comprising a mass body extending along approximately 1/4 of the outer circumference.