JPH07248037A - Sliding bush - Google Patents

Abstract

PURPOSE:To reduce the number of part items and the number of mounting processes, and prevent the dropping-out by providing a resin bearing between the inner cylinder of a sliding bush for vehicle and an elastic body concentrically provided around it, and integrally forming a seal cover extended from a part of the elastic body in the axial direction of the inner cylinder to cover the circumference. CONSTITUTION:A seal cover 6 is extended from both side parts of an elastic body 2 in the end direction of an inner cylinder 1 and integrally formed together with the molding of an outer cylinder 4 to cover the circumference of a protruding part 5, and the top end side is substantially cylindrical to closely make contact with the circumference of the protruding part 5. A resin bearing 3 is charged in a sliding groove 7 consisting of a ring recessed groove on the outer circumference of the inner cylinder 1 so as to be movable in the sliding groove 7 by the inner circumferential surface and both axial end surfaces. The elastic body 2 consists of rubber or an elastomer, and is directly molded around the inner cylinder on which the resin bearing 3 is preliminarily formed, its inner circumferential surface is adhered and integrated into the outer circumferential surface of the resin bearing 3, and the seal cover 6 is also adhered to the protruding part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding bush used in a place where a twist or a twist is applied.

[0002]

2. Description of the Related Art A sliding bush for use in a vehicle suspension or the like which is twisted or twisted in some cases is well known. One example of such a sliding bush is JP-A-61-287807. This is an inner cylinder provided with a spherical convex portion forming a partial large-diameter portion on the outer periphery of the intermediate portion, and a cylindrical member concentrically provided around the inner cylinder, which corresponds to the convex portion of the inner peripheral surface. A collar with a spherical recess formed in the part to be
It is equipped with a resin bearing part made of resin injected into the space formed by these spherical convex parts and concave parts, and an elastic body provided around the collar so that it can cope with both twisting and twisting. ing.

[0003]

By the way, in the case of the above-mentioned known example, the sliding surface is dusty or dust (hereinafter referred to as dust).
It is necessary to form a pair of seal covers that cover between the collar and the inner cylinder as a separate body in order to protect them from the intrusion of the inner cylinder, and then fit and attach them from both axial ends of the inner cylinder to the inner circumference of the collar. In addition, there is a problem in that the number of installation steps is increased, and maintenance is required to prevent dropping during use. Then, this application aims at solving such a problem.

[0004]

In order to solve the above-mentioned problems, a sliding bush according to the present application is provided with an inner cylinder, an elastic body provided concentrically around the inner cylinder, and between the elastic body and the inner cylinder. In a sliding bush provided with a resin bearing portion provided directly or via another member, a seal cover extending from a part of the elastic body in the axial direction of the inner cylinder and covering the periphery of the inner cylinder is integrated with the elastic body. It is characterized by being formed.

The extended end of the seal cover may be fitted in an annular seal groove formed on the outer circumference of the inner cylinder.

Further, regarding the formation of the sliding surface, a sliding groove formed of an annular concave groove is formed on the outer circumference of the inner cylinder, and a resin bearing is filled in this sliding groove to form a resin bearing and a sliding groove. May be a sliding surface, and the outer periphery of the resin bearing may be integrated with the elastic body, and the resin bearing may be provided on the large diameter portion formed on the outer periphery of the inner cylinder and on the inner peripheral side of the elastic body. It may be formed between the sliding groove formed on the collar and corresponding to the large diameter portion.

The sliding bush may be of a type that only twists about the axis, or a type of twisting in which the inner cylinder and the elastic body are relatively inclined in the axial direction in addition to twisting. It may be.

[0008]

Since the seal cover integrally extends from the elastic body in the axial direction of the inner cylinder and covers the outer circumference of the inner cylinder, the sliding surface is protected from intrusion of dust and the like at this portion.

Further, if the extending end of the seal cover is fitted into the annular seal groove formed on the outer circumference of the inner cylinder, the seal becomes more reliable.

The sliding surface of the sliding bush provided with these seal structures has a sliding groove formed of an annular concave groove on the outer circumference of the inner cylinder, and a resin bearing is filled in the sliding groove.
Moreover, if the outer periphery of the resin bearing is integrated with the elastic body, a sliding surface is formed between the sliding groove and the resin bearing fitted therein.

Further, the resin bearing is provided between the large diameter portion formed on the outer circumference of the inner cylinder and the sliding groove corresponding to the large diameter portion formed on the collar provided on the inner circumference side of the elastic body. If it is formed, the outer surface of the resin bearing and the sliding groove of the collar become a sliding surface.

[0012]

According to the sliding bush of the present invention, the seal cover integrally extends from the elastic body in the axial direction of the inner cylinder and covers the outer periphery of the inner cylinder. Therefore, the sliding surface is protected from dust and the like at this portion. Since the seal cover can be protected and is integrally formed with the elastic body, the inner cylinder can be covered with the seal cover at the same time by assembling the inner cylinder and the elastic body. For this reason, the number of parts and the number of mounting steps can be reduced, and since they do not fall off during use, maintenance for this is unnecessary.

Further, when the extending end of the seal cover is fitted into the annular seal groove formed on the outer circumference of the inner cylinder, the seal becomes more reliable.

Further, when applying these seal structures, a sliding groove formed of an annular groove is formed on the outer periphery of the inner cylinder,
If these sliding grooves are filled with resin bearings and the outer circumference of the resin bearings is integrated with the elastic body, these sealing structures can be used for sliding bushes with the inner circumferential side of the resin bearings as the sliding surface. The resin bearing is formed between the large diameter portion formed on the outer circumference of the inner cylinder and the sliding groove corresponding to the large diameter portion formed on the collar provided on the inner circumference side of the elastic body. If so, these seal structures can be used for a sliding bush having a sliding surface on the outer peripheral side of the resin bearing.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a sliding bush formed for a suspension arm of an automobile will be described with reference to FIGS. FIG. 2 shows an axial cross section of this embodiment.
[Fig. 3] is an enlarged view of part A thereof.

As is apparent from these figures, the sliding bush is provided between the inner cylinder 1, an elastic body 2 concentrically fitted around the inner cylinder 1, and between the elastic body 2 and the inner cylinder 1. Outer cylinder 4 into which the resin bearing portion 3 and the elastic body 2 are fitted
Both ends of the inner cylinder are projecting portions 5 projecting to both sides longer than the elastic body 2 and the outer cylinder 4.

Seal covers 6 extend from both sides of the elastic body 2 toward the end of the inner cylinder 1 to cover the periphery of the protrusion 5. The seal cover 6 is integrally formed by using a part of the material of the elastic body 4 at the same time when the elastic body 4 is formed, and has a substantially tubular shape so that its tip end side is in close contact with the periphery of the protruding portion 5.

The resin bearing 3 is formed by filling a known suitable resin having lubricity into a sliding groove 7 formed of an annular groove formed on the outer periphery of the inner cylinder 1, and the inner peripheral surface and Both axial end surfaces are slidable in the sliding groove 7. However, since the movement in the axial direction is limited, it is designed to correspond only to the twisting direction.

The elastic body 2 is a known member made of rubber or a suitable elastomer, and is molded directly around the inner cylinder in which the resin bearing 3 is formed in advance. At this time, the inner peripheral surface of the elastic body 2 is bonded and integrated with the outer peripheral surface of the resin bearing 3, and the seal cover 6 is also bonded to the protruding portion 5.

However, the elastic body 2 is previously formed integrally with the seal cover 6, and then, into the through hole provided inside.
The inner cylinder 1 provided with the resin bearing 3 and having the outer peripheral surface coated with the adhesive may be fitted. It should be noted that the seal cover 6 and the protrusion 5 do not necessarily have to be bonded to each other, and the both can be made slidable.

The outer cylinder 4 is a cylindrical metal member for integrally molding the elastic body 2 inside or for fitting the preformed elastic body 2, and is a member to be mounted (not shown) on the vehicle body side or the like. It is adapted to be fitted into a mounting hole provided in advance. However, the outer cylinder 4 is not always necessary and can be omitted if a structure capable of substituting the outer cylinder 4 for the mounting partner is provided.

According to this embodiment, since the seal cover 6 is in close contact with the projecting portion 5, it is possible to prevent dust and the like from entering the sliding surface from the outside and protect the sliding surface from damage. Therefore, good slidability can be maintained. At this time,
If the seal cover 6 is not adhered to the protrusion 5, the seal cover 6 and the protrusion 5 move relative to each other when the sliding bush is twisted. When the bush is twisted, the elasticity of the seal cover 6 itself allows the follow-up deformation, and the sealing performance is further enhanced.

Moreover, since the seal cover 6 can be integrally formed at the same time as the elastic body 2 is formed, the separate seal cover, which is conventionally attached in a later step, can be omitted. For this reason, the number of parts and the number of mounting steps can be reduced, and since they do not fall off during use, maintenance for this is unnecessary.

FIG. 3 is a view similar to FIG. 1 relating to the second embodiment. Note that the same function parts as in the previous embodiment are designated by the same reference numerals (the same applies to the third embodiment described later).

In this embodiment, the extending end 8 of the seal cover 6 is enlarged in a bead shape, and this portion is fitted into an annular seal groove 9 formed in advance on the entire outer peripheral surface of the inner cylinder 1. There is. With this configuration, the extension end 8 and the seal cover 6
Since the sealing is performed in two stages of itself, the sealing becomes more reliable, and moreover, sufficient sealing cover property can be obtained without adhering the sealing cover 6 to the protrusion 5.

FIG. 4 is a sectional view similar to FIG. 2, showing a third embodiment applied to a sliding bush having a sliding surface on the outer peripheral surface side of a resin bearing. In this embodiment, the elastic body 2
A collar 10 is provided on the inner periphery of the inner cylinder 1, an annular recessed groove 11 is formed in the center of the inner peripheral side thereof, and an annular protrusion 12 corresponding to this is formed on the outer periphery of the inner cylinder 1. The resin bearing 3 is formed between the convex portions 12.

The concave groove 11 and the convex portion 12 each have a concentric spherical curved surface, the resin bearing 3 is integrated with the convex portion 12 side, and a sliding surface is formed between the outer peripheral surface and the concave groove 11. It can handle both twisting and twisting directions.

Although the seal cover 6 is formed integrally with the elastic body 2, the diameter of the collar 10 and that of the inner cylinder 1 are largely different from each other, so that the extension end side is set to the outer diameter of the inner cylinder 1. It has a reduced diameter. Molding of such a seal cover 6 is possible as appropriate.

For example, if both ends of the middle mold put into the collar 10 when the elastic body 2 is molded are made to project from the collar 10 and the projecting portions are reduced to the outer diameter of the inner cylinder 1, the elastic body 2 After molding, the elasticity of the seal cover 6 can be used to remove the middle mold.

According to the present embodiment, the advantages of the present invention in which the seal cover 6 is integrated with the elastic body 2 can be enjoyed, and
It can also be applied to sliding bushes in which the sliding surface is formed on the outer peripheral side of the resin bearing. Furthermore, it is naturally possible to apply the extension end 8 of the second embodiment to this embodiment.

The present invention is not limited to these embodiments and can be variously modified and applied. For example, the elastic body 2 of the first and second embodiments is not necessarily formed directly on the outer circumference of the inner cylinder 1. Alternatively, the collar 10 may be used as in the third embodiment. Further, if the sliding surface of the third embodiment is not a curved surface but has a linear shape as in the first embodiment, it can be used only for twisting.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a main part of a sliding bush according to a first embodiment.

FIG. 2 is an overall sectional view of a sliding bush according to the first embodiment.

FIG. 3 is an enlarged sectional view of a main part of a sliding bush according to a second embodiment, which corresponds to FIG.

FIG. 4 is an overall cross-sectional view corresponding to FIG. 1 of a sliding bush according to a third embodiment.

[Explanation of symbols]

1: inner cylinder, 2: elastic body, 3: resin bearing, 6: seal cover, 8: extension end

Claims (4)

[Claims] 1. A sliding bush comprising an inner cylinder, an elastic body provided concentrically around the inner cylinder, and a resin bearing portion provided directly between the elastic body and the inner cylinder or through another member. In, in the axial direction of the inner cylinder from a part of the elastic body,
A sliding bush characterized in that a seal cover that covers the periphery of the inner cylinder is formed integrally with an elastic body. 2. The sliding bush according to claim 1, wherein the extending end of the seal cover is fitted in an annular seal groove formed on the outer circumference of the inner cylinder. 3. A sliding groove formed of an annular concave groove is formed on the outer circumference of the inner cylinder, and a resin bearing is filled in the sliding groove to form a sliding surface between the resin bearing and the sliding groove. The sliding bush according to claim 1 or 2, wherein an outer periphery of the resin bearing is integrated with an elastic body. 4. A resin bearing is provided between a large diameter portion formed on the outer circumference of an inner cylinder and a sliding groove formed on a collar provided on the inner circumferential side of an elastic body and corresponding to the large diameter portion. It formed, The sliding bush of Claim 1 or Claim 2 characterized by the above-mentioned.