KR20030096623A - Strut for suspension - Google Patents

Abstract

PURPOSE: A strut for a suspension in a vehicle is provided to improve steering stability and reduce rolling of the vehicle by increasing the coil spring constant in cornering with surrounding the upper part of a coil spring by a lower spring pad, and to increase the durability of the coil spring by preventing noise from contact between coils. CONSTITUTION: A strut for a suspension is composed of a shock absorber including an outer cylinder and a rod; a lower spring seat(150) mounted in the outer cylinder of the shock absorber and composed of a seat surface and an inner flange; a lower spring pad inserted to the lower spring seat; a coil spring(140) mounted on the lower spring pad; an upper spring pad mounted on the coil spring; an upper spring seat mounted on the upper spring pad and inserted to the rod of the shock absorber; an insulator mounted on the upper spring seat and inserted to the rod of the shock absorber; and a nut fastening the upper spring seat and the insulator to the rod of the shock absorber. The lower spring pad comprises a lower pad(152A) supporting the lower part of the coil spring, a side pad(152B) supporting the side of the coil spring, and an upper pad integrally formed with the side pad to surround the upper part of the coil spring.

Description

Struts for Vehicle Suspensions {STRUT FOR SUSPENSION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to struts for vehicle suspensions, and more particularly to struts for vehicle suspensions, wherein upper pads are formed on a part of the lower spring pads.

1 is a perspective view of a strut for a conventional vehicle suspension device (Publication Utility Model Publication No. 2000-16340).

As shown in FIG. 1, the vehicle suspension strut 100 includes a shock absorber 110 and a compressed shock absorber 110 that generate a damping force while a valve (not shown) reciprocates in an oil-filled interior. It is composed of a coil spring 140 provided on the outside to restore.

The shock absorber 110 includes an outer cylinder 111 in which a valve (not shown) is accommodated and a rod 120 connected to the valve (not shown).

The outer cylinder 111 is provided with a knuckle bracket 112 for connecting the knuckle and the strut, and the lower spring sheet 150 is fixed to the outer cylinder 111 on the upper portion of the knuckle bracket 112. Depending on the fixing position of the strut, instead of the knuckle bracket 112, a cylindrical bracket may be installed in the lower portion of the outer cylinder 111.

The lower spring pad 152 of rubber material is mounted on the lower spring sheet 150, and a coil spring 140 is installed on the lower spring pad 152.

The portion where the coil spring 140 contacts the lower spring pad 152 (hereinafter, referred to as the “left winding portion”) is generally 0.75 volumes based on the number of turns (the number of turns) of the coil spring. That is, when the portion of the coil spring 140 in contact with the lower spring pad 152 is expressed as an angle, 270 degrees is general.

The lower spring pad 152 is formed of a pad lower portion supporting the lower surface of the coil spring and a pad side portion integrally formed with the lower surface of the pad spring and supporting the outer surface of the coil spring.

In addition, after the upper spring pad 162 is installed on the upper portion of the coil spring 140, the upper spring sheet 160 is inserted into the rod 120 of the shock absorber 110.

An insulator 130 is installed on the upper spring sheet 160, and the upper spring sheet 160 and the insulator 130 are fixed to the rod 120 of the shock absorber using the nut 125. In the case of the strut formed in front of the vehicle, a bearing (not shown) may be installed inside the insulator 130 so that the strut rotates with respect to the vehicle body during steering.

The bolt 132 formed on the insulator 130 is a member for fixing the strut 100 to the vehicle body.

2 is a view showing a structure in which a lower spring seat 150 and a shock absorber outer cylinder 111 are fixed in a conventional vehicle suspension strut. As shown in FIG. 2, in the conventional vehicle suspension strut, the lower spring seat 150 is fixed to the outer cylinder 111 by welding, and the lower spring pad 152 is mounted on the lower spring seat 150. Then, the coil spring 140 is installed on the lower spring pad 152 to assemble the strut.

In the case of the prior art as described above, due to the pedestrian protection legislation of the height of the body hood and the lack of coil spring mounting space due to the application of large diameter tires, not only the contact sound caused by the contact between the coil springs, but also the ride comfort and the steering stability There was a limit to the performance improvement.

The present invention has been made to solve the above-described conventional problems, such as to prevent the contact sound caused by the contact between the coil springs, and to improve the shape of the lower spring pad to be inserted between the coil springs. It is to provide a strut for a vehicle suspension that can improve the steering stability.

1 is a perspective view showing a conventional strut

2 is a coupling structure of the spring sheet in the conventional strut

Figure 3 is a coupling structure of the lower spring pad according to the present invention

Figure 4 is a perspective view of the lower spring pad according to the present invention

* Brief description of the major symbols in the drawings *

100 struts

110 Shock Absorber

120 load

130 insulators

140 coil spring

150 Lower Spring Seat

In order to achieve the above object, the strut for vehicle suspension of the present invention includes: a shock absorber including an outer cylinder rod; A lower spring sheet fixed to an outer cylinder of the shock absorber, the lower spring sheet comprising a sheet surface and an inner flange; A lower spring pad inserted into the lower spring sheet; A coil spring mounted on the lower spring pad; An upper spring pad installed at an upper portion of the coil spring; An upper spring sheet installed at an upper portion of the upper spring pad and inserted into a rod of the shock absorber; An insulator installed on an upper portion of the upper spring sheet and inserted into a rod of the shock absorber; A nut securing the upper spring sheet and the insulator to the rod of the shock absorber; The lower spring pad is formed integrally with the pad lower portion supporting the lower left portion of the coil spring and the pad lower portion, and integrally formed with a pad side portion supporting the left winding portion side of the coil spring and a part of the pad side portion. , The pad upper portion formed to surround the upper left portion of the coil spring.

In addition, the size of the pad upper portion of the vehicle suspension strut of the present invention is characterized in that about 0.5 volumes based on the number of turns of the coil spring.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described. Parts identical to those in the prior art are not shown.

As shown in Figure 3, the lower spring seat 150 is fixed to the outer cylinder 111 of the shock absorber 110 according to the present invention, the lower spring pad 150 and the lower spring pad between the coil spring 140 152 is provided.

The lower spring pad 152 is formed under the pad lower portion 152A for supporting the lower left portion of the coil spring 140, and the pad side portion for integrally forming the lower surface of the coil spring 152 and supporting the outer surface of the coil spring 140. 152B) and a pad upper portion 152C formed integrally with a portion of the pad side portion 152B and configured to surround the upper left portion of the coil spring 140.

The upper pad portion 152C is not formed over the entire length of the pad side portion 152B, but is preferably about 0.5 volumes based on the number of turns of the coil spring 140, and the receiving groove 152D is formed on the outer surface of the upper pad portion 152C. ) Is formed.

The upper pad portion 152c starts to wrap the upper left surface of the coil spring 140 from the portion where the left winding portion of the coil spring 140 starts, that is, the lowermost portion of the coil spring 140, and then 0.5 turns from the left winding portion (0.75 windings). It is preferable to arrange so as to surround by length.

Hereinafter, the operation of the present invention will be described.

When the vehicle is turning, a roll motion occurs in the vehicle about the axis in the front and rear direction of the vehicle, and the coil spring 140 of the outer swing strut is compressed, and the coil spring 140 of the inner rotor strut is tensioned.

The coil spring 140 of the swinging outer strut is formed to have a constant pitch, but since the upper spring pad 152 is formed on the lower spring pad 152 so as to surround the upper portion of the left winding part, an excessive roll is generated so that When the compression amount of the coil spring 140 increases, the coil close to the pad upper surface 152C comes into contact with the receiving groove 152D of the lower spring pad 152.

When a part of the coil is in contact with the receiving groove 152D of the lower spring pad 152, since the effective number of the coil spring 140 is reduced, the spring constant of the coil spring 140 is increased.

Therefore, since the spring constant of the coil spring 140 of the turning outer strut increases, it is possible to suppress the roll generated when the vehicle turns, thereby improving steering stability.

In the case of the linear movement, not the turning movement, when excessive load is applied in the vertical direction of the vehicle, the pitch movement occurs when viewed from the side of the vehicle. That is, the coil spring 140 of the left and right struts is subjected to compression or tensile movement.

When the coil spring 140 is excessively compressed, a portion of the coil comes into contact with the receiving groove 152D of the lower spring pad 152, thereby increasing the spring constant of the coil spring 140. That is, the pitch motion of the vehicle can be suppressed by increasing the spring constant in the same manner as the roll is suppressed when the vehicle is turning.

The depth of the receiving groove 152D formed in the lower spring pad 152 may be freely set in consideration of other factors affecting the ride comfort and steering stability, such as the type of vehicle and the spring constant of the coil spring. That is, the shallower the depth of the receiving groove 152D formed in the lower spring pad 152, the faster the coil is in contact with the receiving groove 152D, so if it is necessary to actively suppress the roll movement during the vehicle turning, the receiving groove It is to set the depth of 152D shallowly.

The present invention is configured to surround the upper surface of the coil spring by the lower spring pad, when the adjacent coil is in contact with the upper portion of the lower spring pad, the effective number of the coil spring is reduced to increase the spring constant of the coil spring do. Therefore, since the spring constant of the outer swing coil spring to which the coil spring is compressed when the vehicle is turning increases, the roll generated in the vehicle during the turning can be reduced, and thus the steering stability can be improved.

In addition, when an excessive load is applied to the vehicle in the up and down direction, the steel wires of the coil springs are prevented from contacting each other, so that noise caused by the line contact between the coil springs is not generated and the endurance life of the coil springs is prevented by the line contact prevention. You can increase it.

In addition, the section in which the accommodating groove is adopted in the upper portion of the pad of the lower spring pad can be set according to the depth of the accommodating groove so that the section in which the steel wire of the coil spring contacts the upper portion of the pad can increase the effective spring constant of the coil spring. Design freedom for setting is increased.

Further, since the upper portion of the pad of the lower spring pad corresponds to about 0.5 of the number of coil spring turns, the upper portion of the pad can be easily formed and the material can be saved.

Claims (3)

A shock absorber including an outer barrel and a rod; A lower spring sheet fixed to an outer cylinder of the shock absorber, the lower spring sheet comprising a sheet surface and an inner flange; A lower spring pad inserted into the lower spring sheet; A coil spring mounted on the lower spring pad; An upper spring pad installed at an upper portion of the coil spring; An upper spring sheet installed at an upper portion of the upper spring pad and inserted into a rod of the shock absorber; An insulator installed on an upper portion of the upper spring sheet and inserted into a rod of the shock absorber; A nut securing the upper spring sheet and the insulator to the rod of the shock absorber; The lower spring pad, A lower pad for supporting the lower left portion of the coil spring, A pad side part which is formed integrally with the pad lower part and supports the left side of the coil spring side; And a pad upper portion formed integrally with a portion of the pad side portion and surrounding the upper left portion of the coil spring. The method of claim 1, The size of the upper portion of the pad is a vehicle suspension strut, characterized in that about 0.5 volumes based on the number of turns of the coil spring. The strut for vehicle suspension according to claim 1 or 2, wherein a receiving groove is formed on an outer surface of the pad upper portion.