JPS5911814Y2 - Support device for automobile steering mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a steering mechanism of an automobile, and more particularly to a device for supporting a rack housing in a rack and pinion type steering mechanism.

The rack and pinion steering mechanism transmits the rotation of the steering wheel to the pinion gear to move the rack left and right.
This movement of the rack is transmitted to the knuckle arm via the tie rod to rotate the steering wheel in any direction.

This type of steering mechanism requires a support device to support the rack extending laterally.

For this reason, rack housings have conventionally been supported by brackets on engine-mounted suspension members.

This suspension member is firmly fixed to the side members of the vehicle body at both ends, but since the rack housing protrudes behind the suspension member, the suspension member is subject to a large amount of torsional vibration.

This torsional vibration becomes particularly large when the car is running at high speed, increases the sound pressure level inside the car, and causes so-called muffled noise inside the car.

An object of the present invention is to provide a support device for a steering mechanism that reduces torsional vibration of a suspension member mounted on an automobile engine, reduces the sound pressure level inside the vehicle, and prevents the generation of muffled noise. It is in.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic plan view of the inside of the front hood (engine compartment) of an automobile.

FIG. 2 is a perspective view of a portion thereof.

In these figures, the direction indicated by arrow A is the front of the vehicle.

The engine 1 is mounted on a suspension member 3 via an engine bracket 2.

The suspension member 3 extends substantially laterally and is fixed to the vehicle body side member 4 at both ends thereof.

In the pinion-rack type steering mechanism, the rotation of the handle 5 is controlled by a pinion gear located inside the rack housing 6.
(not shown), and the rack par 7, which is engaged with the pinion gear, is moved from side to side.

Reference numeral 8 denotes a telescopic rack boot that accommodates a rack, and both ends of the rack are connected to knuckle arms (not shown) of the steering wheel via tie rods (not shown), and the ends of the rack are connected to knuckle arms (not shown) of the steering wheel (not shown). ) can be rotated in any steering direction.

The rack housing 6 of the steering mechanism is located at the rear of the suspension member 3 as shown in the figure, and is supported by the suspension member 3 by a bracket 9.

With this structure, the vibrations of the engine 1 transmitted to the suspension member 3 via the engine bracket 2 are directly transmitted to the rack housing 6 through the bracket 9.
This causes the relatively heavy rack housing 6 and rack par 7 to vibrate up and down.

Moreover, as mentioned above, since the rack housing 6 is supported behind the suspension member 3 by the bracket 9, this becomes an overhang, and the vertical vibration of the steering mechanism including the rack housing 6 and the rack par 7 is caused by the torsional vibration of the suspension member 3. is added to
In particular, it has a negative effect on muffled noise in the high-speed range of automobiles.

However, in the present invention, as shown in the figure, the rear part of the bracket 9 for fastening the rack housing 6 is attached to the place member 1.
Since the suspension member 3 is connected to the side member 4, which is a rigid part of the vehicle body, at 0, the torsional vibration of the suspension member 3 tends to be directly transmitted to the side member 4, and the torsional vibration is suppressed.

3 and 4 show a place member 10 according to the present invention.
FIG. 3 is a diagram comparing the sound pressure sensitivities between a case where a place part is attached (indicated by a broken line) and a case where a place part is not attached as in the past (indicated by a solid line).

Figure 3 shows the sound pressure sensitivity (vertical axis) on the left side of the rear seat when a vertical vibration frequency (horizontal axis) is applied to the left mount racket of suspension member 3, and Figure 4 shows the sound pressure sensitivity of suspension member 3. Sound pressure sensitivity on the left side of the rear seat when a vertical vibration frequency (horizontal axis) is applied to the right mount bracket (
(vertical axis).

As can be seen from these figures, the maximum sound pressure sensitivity at 120 to 140 Hz is the same as the place member 10 of the present invention.
Reduced by installing.

As a result, the present invention can reduce muffled noise, especially in the high-speed range of automobiles.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view of the inside of the front hood of a car;
FIG. 2 is a perspective view of a portion thereof, and FIGS. 3 and 4 are diagrams comparing the sound pressure sensitivity of the present invention and the conventional one. 3... Suspension member, 4...
Vehicle side member, 6... Rack housing,
7... Rack bar, 9... Bracket, 10... Place member.

Claims (1)

[Scope of utility model registration request] A suspension member 3 for mounting an engine on an automobile is fixed to a vehicle body side member 4 at both ends, and a rack housing 6 of a rack and pinion type steering mechanism is located behind the suspension member, and a bracket 9 is attached to the suspension member 3.
A support device for a steering mechanism of an automobile, which is supported by the suspension member via a support device for a steering mechanism of an automobile, characterized in that the rear part of the bracket 9 is connected to the vehicle body side member 4 by a place member 10. .