JP2576360Y2 - Slide bush - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, a rubber elastic body is provided between an outer collar and an inner collar into which a shaft member is slidably inserted while allowing relative movement in the axial direction and relative rotation about the axis. And a slide bush that receives a radial load.

[0002]

2. Description of the Related Art Conventionally, such a slide bush is well known, for example, from Japanese Utility Model Laid-Open No. 59-63241.

[0003]

However, in the above-mentioned prior art, the entire inner surface of the inner collar is slid in contact with the outer surface of the shaft member, and the sliding load is large because the slidable contact area is relatively large. In addition, because the entire surface of the inner collar and the shaft member are in sliding contact with each other, a clearance of, for example, about 50 μm is set between the inner collar and the shaft member, and a radial load is applied due to such clearance. Occasionally, a tapping sound is generated due to the inner surface of the inner collar hitting the outer surface of the shaft member. Therefore, when a part of the inner collar is slid on the outer surface of the shaft member,
When the load increases, the frictional force on the sliding contact surface increases, and the amount of wear increases.

The present invention has been made in view of such circumstances, and provides a slide bush that can reduce the amount of wear while relatively reducing the sliding load and can suppress the occurrence of hitting noise. The purpose is to provide.

[0005]

To achieve the above object, according to the solution to ## according to the present invention, the inner collar, the In'naka
A pair of sliding contact portions that are always in sliding contact with the outer surface of the shaft member at both axial end portions of the shaft, and a connecting portion that integrally connects the two sliding contact portions.
The connecting portion is opposed to the outer surface of the shaft member at a distance in a low load state and has elasticity so as to contact the outer surface of the shaft member as the load increases . .
According to this feature, the inner collar is
The sliding contact portions at both ends are brought into sliding contact with the outer surface of the shaft member and
Because the connecting part is raised above the outer surface of the shaft member,
Dynamic load can be reduced. When the load becomes large
The connection part is elastically deformed and the inner surface of the inner collar
The entire surface comes into sliding contact with the outer surface of the shaft member.
The product is made relatively large to reduce the amount of wear.
Initial displacement energy is absorbed by the elastic displacement of the connection
This suppresses the occurrence of a tapping sound.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the present invention. FIG. 1 is a front view of a slide bush, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a front view of an inner collar. FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, and FIG. 5 is an enlarged view of the portion indicated by arrow 5 in FIG.

Referring first to FIGS. 1 and 2, this slide bush is provided between a trailing arm (not shown) of a suspension system of a motor vehicle and a vehicle body (not shown), and receives a radial load. A rubber elastic body 12 is provided between a cylindrical outer collar 10 fixed to the trailing arm side and an inner collar 11 concentric with the outer collar 10. The shaft member 13 connected to the vehicle body is slidably inserted while allowing relative movement in the axial direction and relative rotation around the axis.

The rubber elastic body 12 has an outer cylindrical portion 12 fixed to the inner surface of the outer collar 10 by, for example, vulcanization bonding.
a and the inner cylindrical portion 12b to which the inner collar 11 is fitted
And a disk part 1 connecting the outer cylinder part 12a and the inner cylinder part 12b
2c. On both sides of the inner collar 11, through holes 14, 14 for causing the rubber elastic body 12 to exhibit predetermined spring characteristics are formed in the disk portion 12c along one diameter line of the inner collar 11. It is provided in an elongated shape. In addition, the side walls at the center in the longitudinal direction of the through holes 14 are in sliding contact with each other.

The shaft member 13 includes a shaft main body 13 having a circular cross section.
The connecting shafts 13b and 13c having a rectangular cross section are integrally provided at both ends of the connecting shaft 13a.
Insertion holes 15 and 16 for inserting bolts (not shown) for fixing the connection shaft portions 13b and 13c to the vehicle body side are respectively formed in 13c.

Referring to FIG. 3, FIG. 4 and FIG.
The inner collar 11 is a flange 1 that projects outward in the radial direction.
7 and 18 are formed at both ends in the axial direction and are basically formed of, for example, a synthetic resin in a cylindrical shape, and are always in sliding contact with the outer surface of the shaft main portion 13a of the shaft member 13 at one end in the axial direction. Portion 11a and a sliding contact portion 11b which is always in sliding contact with the outer surface of the shaft main portion 13a of the shaft member 13 at the other end in the axial direction.
When the load is low, the shaft main body 13
It is connected to the outer surface of a through a connecting portion 11c facing at an interval.

The sliding contact portions 11a and 11b have an inner diameter that is in close contact with the outer surface of the shaft main portion 13a in a natural state, whereas the inner diameter of the connecting portion 11c is in a natural state. It is set to such an extent that a gap 19 (see FIG. 5) is formed between the outer surface of the portion 13a.

The inner collar 11 has four notches 20 extending in the axial direction so that the outer end is open at one end in the axial direction and the inner end is closed at the other end in the axial direction.
Are provided, and four notches 21 extending in the axial direction so as to open the outer end at the other end in the axial direction and close the inner end at one end in the axial direction are provided with the inner collar 11.
Are provided at equal positions in the circumferential direction at positions deviated by 45 degrees from the notches 20. Therefore, at one axial end of the inner collar 11, the sliding contact portion 11a and the flange portion 17 are cut off at four places at equal intervals in the circumferential direction, and at the other axial end of the inner collar 11, the sliding contact portion 11b is formed.
The flange 18 is cut off at four locations at equal intervals in the circumferential direction. Grooves 22 connected to the notches 21 are provided on the inner surface of the sliding contact portion 11a, and grooves 23 connected to the notches 20 respectively on the inner surface of the sliding contact portion 11b.
... are provided.

The inner collar 11 constructed as described above
Is fitted to the inner cylindrical portion 12b such that the axial movement of the inner cylindrical portion 12b of the rubber elastic body 12 is restricted by the flange portions 17 and 18 at both ends. Thus, the notches 20 ..., 21
Are provided so that the inner collar 11 is provided.
Exerts a spring force in a direction in which the sliding contact portions 11a and 11b at both ends thereof are brought into sliding contact with the outer surface of the shaft member 13, and together with the sliding contact portions 11a and 11b as the load increases. 13 has elasticity to bend the connecting portion 11c so as to contact the outer surface of the shaft main portion 13a.

The inner cylindrical portion 12b of the rubber elastic body 12
One ends of dust covers 24 and 25 are engaged with both ends of the shaft member 1, respectively.
3 are respectively attached to both ends of the shaft main body 13a.

Next, the operation of this embodiment will be described. The inner collar 11 is in a state where the sliding contact portions 11a and 11b at both ends thereof are in sliding contact with the outer surface of the shaft member 13 in a low load state. The sliding contact area in the state can be made relatively small, and the sliding load can be kept small.

When the load becomes large, the inner collar 11 bends so that the entire inner surface thereof slides on the shaft member 13, so that the sliding contact area can be made relatively large, thereby reducing the amount of wear. It can contribute to reduction.

When the load further increases, the connecting portion 11c of the inner collar 11 bends inward and comes into contact with the outer surface of the shaft member 13. The initial displacement energy at that time is caused by the spring effect of the inner collar 11. By being absorbed, occurrence of a tapping sound is suppressed, and based on that, the connecting portion 1
The initial set value of the inner diameter of 1c can be made relatively large, and the degree of freedom in dimension setting can be increased.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various designs can be made without departing from the present invention described in the claims for utility model registration. Changes can be made.

[0020]

As described above, according to the present invention, the inner collar is composed of a pair of sliding contact portions that are always in sliding contact with the outer surface of the shaft member at both axial ends of the collar, and the two sliding contact portions are integrally formed. Nire
And a connecting portion which is opposed to the outer surface of the shaft member with a space therebetween in a low load state and is elastic so as to come into contact with the outer surface of the shaft member as the load increases.
As a result, the sliding load in a low load state can be kept small, and when the load becomes large, the sliding contact area can be made relatively large to contribute to a reduction in the amount of wear. The initial displacement energy can be absorbed by the elastic displacement of the connecting portion to suppress the generation of a tapping sound, and based on this, the degree of freedom of the initial setting dimension of the inner diameter of the connecting portion can be increased.

[Brief description of the drawings]

FIG. 1 is a front view of a slide bush.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a front view of an inner collar.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is an enlarged view of a portion indicated by an arrow 5 in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Outer collar 11 Inner collar 11a, 11b Sliding part 11c Connecting part 12 Rubber elastic body 13 Shaft member

Claims (1)

(57) [Scope of request for utility model registration] An inner collar (1) through which a shaft member (13) is slidably inserted while allowing relative movement in an axial direction and relative rotation about an axis with an outer collar (10).
Made by rubber elastic body (12) is provided between the 1), in the slide bush receives a load in the radial direction, the inner collar (11), said inner collar (11)
And a pair of sliding contact portions (11a, 11b) which are always in sliding contact with the outer surface of the shaft member (13) at both axial end portions thereof, and both sliding contact portions (1).
1a, 11b) and a connecting portion (11c) for integrally connecting the
Equipped with, the connecting portion (11c) is in contact with the outer surface of the shaft member in response to the load becomes larger with a low load state are opposed to each other at an interval in the outer surface of the shaft member (13) (13) A slide bush characterized by having elasticity so as to make the slide bush.