JPH0425609A - Spherical sliding bush - Google Patents

Abstract

PURPOSE:To prevent invasion of water and dusts by designing such a composition that a pair of ring type insert and a cylindrical sealing member are provided, a thick base where the outer periphery of one of the inserts is brought in contact with the inner periphery of retaining member, and its inner periphery is brought in contact with the outer periphery of the swollen part, an extending part, and the other of the inserts are made of an elastic material. CONSTITUTION:An insert 3A is made of a resin material excellent in its sliding property, and the inner periphery thereof is formed in a spherical concave 3a along the outer periphery of the above-described swollen part 21. The insert 3A is composed of a thick base 31 and a thin extending part 32 extending therefrom. The base 31 is formed in an approximately trapezoid section having a plane formed outer periphery and the inner periphery composing a part of the concave 3a. An insert 3B is formed in an approximately trapezoid section composed of an elastic material such as hard urethane or hard rubber, or the like, and the inner periphery thereof is formed as a spherical concave and connected elastically to the outer peripheral surface of an extending part of the insert 3A, while the outer periphery thereof is formed in a plane and connected elastically to the inner periphery of a retainer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a spherical sliding push, and particularly to a spherical sliding push that has a simple structure and does not cause play in the sliding portion.

[Prior art] Cylindrical bushes are often used in the connecting parts of vehicle suspensions. Various types of spherical sliding pushers have been proposed that enable rotation and twisting motion. -Example (
Utility Model Publication No. 6344572) is shown in FIG.

In the figure, the cylindrical holding portion 5 of the suspension arm 51
An outer cylinder 1 is press-fitted inside, and an inner cylinder 2 passes through the center thereof. The inner cylinder 2 has a central outer periphery bulged out to form a spherical surface, and a resin insert 3 is slidably abutted on the outer peripheral surface of the bulged portion 21. The insert 3 is the outer cylinder 1
A seal ring 6 with a lip portion 61 extending outwardly from both openings is disposed, and a backup ring 7 is further disposed outwardly of the seal ring 6, which is inserted into the openings of the sealing ring 6. The open end of the tube 1 is deformed by caulking to determine its position.

With this structure, the suspension arm is completely prohibited from moving in the direction perpendicular to the axis, and can freely rotate around the inner cylinder 2, and can also freely swing along the bulge 21 as shown by the arrow in the figure. It is.

"Problem to be Solved by the Invention" By the way, in the conventional structure described above, when the insert 3 receives an axially outward force during use, the seal ring 6
deforms and moves, deteriorating sealing performance,
Play occurs between the insert 3 and the inner cylinder bulge 21, resulting in a decrease in steering stability.

In addition, since the seal ring 6 and the backup ring 7 are provided separately, it takes time and effort to manage parts and assemble them, and also requires caulking of the outer cylinder 1, resulting in high manufacturing costs.

In addition, the problem of a large number of parts can be solved, for example, by
This is also common to the bushings described in Japanese Utility Model Publication No. 49143 and Japanese Utility Model Publication No. 110619/1983.

The present invention solves these problems, and aims to provide a spherical sliding push that can significantly reduce the number of parts and effectively prevent backlash and deterioration of sealing performance due to movement of the seal ring. .

[Means for Solving the Problems] To explain the present invention in detail, the spherical sliding push is comprised of a pair of cylindrical holding members 5 which are press-fitted into the holding member 5 through both openings thereof, as shown in FIG. Outer cylinder 1 and these outer cylinders 1
An inner cylinder 2 which is disposed concentrically through the inner cylinder and has a spherical bulge 21 formed in the axial center thereof and which bulges outward in the radial direction.
The inner end of each outer cylinder 1 is interposed between the inner end of the outer cylinder 1 and the bulging part 21, and the outer end is in contact with the inner end of the outer cylinder 1, and the inner circumferential concave surfaces 3a and 3b are arranged on the outer periphery of the bulging part 21. A pair of ring-shaped inserts 3A and 3B each having a curved surface to follow, an outer circumferential edge of which is joined to the inner circumferential surface of each of the outer tubes 1, covers the outside of the insert 3, and an inner circumferential edge of which extends to the outer circumferential surface of the inner tube 2. and a cylindrical sealing member 4 that is in liquid-tight contact with the insert, and the outer periphery of the insert 3A is in contact with the inner periphery of the holding member 5, and the inner periphery is in contact with the outer periphery of a half of the bulged portion 21. It consists of a thick base 31 that is slidably in contact with the base 31, and a thin elastically deformable extending part 32 that extends from the base 31 so as to be in slidable contact with the outer periphery of the remaining half of the bulge 21. , the other 3B of the insert is made of an elastic material,
The outer periphery thereof is shaped to be in elastic contact with the inner periphery of the holding member 5, and the inner periphery thereof is in elastic contact with the outer periphery of the extending portion 32.

[Operation] In the sliding push of the above structure, the movement of the ring-shaped inserts 3A and 3B in the axial direction is reliably prevented because their outer ends are in contact with the inner end of the outer cylinder 1, and as a result, the seal member 4 It does not deform the material and deteriorate the sealing performance.

The one insert has an extending portion 32 forming a part of the inner circumferential concave surface 3a that is connected to the other insert 3B.
Because it is constantly deformed into a shape that follows the outer periphery of the inner cylinder bulge 21 under the elastic force of be brought into contact.

Since the sealing member 4 is formed integrally with the outer cylinder 1, the number of parts can be reduced and it is less likely to be deformed by external forces.

Further, since there is no need for caulking the outer cylinder 1 to position the inserts 3A, 3B and the seal member 4, manufacturing costs are also reduced.

[Example] In FIG. 1, an inner cylinder 2 is passed through the center of the cylindrical holding member 5 formed at the end of the suspension arm 51, and the center of the inner cylinder 2 in the axial direction is thick. The bulging portion 21 bulges outward in the radial direction to form a spherical surface. Ring-shaped inserts 3A and 3B are press-fitted between both openings of the holding member 5 and the inner cylinder bulge 21, respectively.The insert 3A covers the entire bulge 21, and the insert 3B is located on the outer periphery of the insert 3A.

The insert 3A is made of a resin material with good sliding properties, and its inner periphery has a spherical concave surface 3a along the outer periphery of the bulged portion 21.
It becomes. As shown in FIG. 2, the insert 3A has a thick base portion 31 and a thin extension portion 32 extending from the thick base portion 31.
The base portion 31 has a substantially trapezoidal cross section having a flat outer periphery and an inner periphery forming a part of the concave surface 3a.

Further, the extending portion 32 has a thin shape that curves along the outer periphery of the bulging portion 21, and slits 33 are formed in the axial direction at a plurality of positions in the circumferential direction so that the extending portion 32 can be deformed by contracting or expanding. In addition, a groove 34 is formed at the boundary between the base 31 and the extension 32 to prevent this portion from coming into contact with the top surface of the bulge 21 (Fig. 1), and to prevent the dimensional tolerance of the insert 3A. This prevents variations in sliding performance due to

The insert 3B is made of an elastic material such as hard urethane or hard rubber and has a substantially trapezoidal cross section, and its outer periphery is flat and comes into elastic contact with the inner periphery of the holding part 5, and the inner periphery has a spherical concave surface. and is in elastic contact with the outer circumferential surface of the extending portion of the insert 3A.

Inside the holding part 5 in which the inserts 3A and 3B are positioned, outer cylinders 1 are further press-fitted from both openings, respectively.
The inner end of each outer cylinder 1 is connected to each of the above inserts 3A and 3B, respectively.
The inserts 3A, 3B are positioned by abutting against the outer ends of the inserts 3A, 3B.

A rubber seal member 4 is bonded to the inner periphery of each of the outer cylinders 1. This sealing member 4 has a generally cylindrical shape as a whole, and the outer periphery of the inner end opening is joined to the inner periphery of the outer cylinder 1, and a seal lip 42 is formed on the inner periphery of the outer end opening to provide a liquid-tight seal to the outer periphery of the inner cylinder 2. is in contact with

When the bushing is in use, the insert 3A freely slides and rotates along the bulge 21, so that the suspension arm 51 can rotate around the inner cylinder 2 and can also freely swing (indicated by the arrow in the figure). . and,
The grease on the sliding portion is well retained by the seal member 4, and water and the like are prevented from entering from the outside.

Here, even if a force acts outward in the axial direction on the inserts 3A, 3B, since these inserts 3A, 3B are in contact with the inner end of the outer cylinder 1, their outward movement is reliably prevented. , and the bulge 21 will not cause play. Of course, the problem of deforming the sealing member 4 due to movement does not occur.

Furthermore, since the extending portion 32 of the inserter)-3A is constantly biased inward in the radial direction by receiving elastic force from the insert 3B, even if the concave surface 3a is worn out due to long-term use, it will always remain in good condition. is brought into sliding contact with the outer peripheral surface of the bulging portion 21,
No rattling will occur.

[Effects] As described above, the spherical sliding push of the present invention has a simple structure, is easy to assemble, is easy to manufacture, and is low cost, and also prevents backlash in the sliding part and water, dust, etc. Intrusion can also be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is an overall longitudinal sectional view of a slide push showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of an insert, and FIG. 3 is an overall longitudinal sectional view of a slide push showing a conventional example. 1...Outer cylinder 2...Inner cylinder 21...Bulging parts 3A, 3B...Insert 31...Base 32...Extending part 3a...Inner circumference concave surface 4...Seal Member 42... Seal lip 5... Holding part (holding member) Fig. 3

Claims (1)

[Claims] A pair of outer cylinders are press-fitted and fixed into the holding member through both openings of the cylindrical holding member, and a pair of outer cylinders is disposed concentrically through the outer cylinders and expands outward with a spherical surface in the axial center. An inner cylinder having a bulging portion formed therein, and an inner end of each of the outer cylinders and the bulging portion are interposed between each other, the outer ends of which are in contact with the inner ends of the outer cylinder, and the concave surface of the inner periphery is formed with the bulging portion. a pair of ring-shaped inserts each having a curved surface along the outer periphery of the outer cylinder; the outer periphery is joined to the inner periphery of each of the outer cylinders, covers the outside of the insert, and the inner periphery extends to the outer periphery of the inner cylinder; a cylindrical sealing member that contacts in a liquid-tight manner, and one of the inserts has a thickness such that the outer periphery contacts the inner periphery of the holding member and the inner periphery slidably contacts the outer periphery of the half of the bulged portion. Consisting of a fleshy base, and an elastically deformable thin-walled extension extending from the base in slidable contact with the outer periphery of the remaining half of the bulging part,
A spherical sliding bush, characterized in that the other of the inserts is made of an elastic material, and the outer periphery of the insert is in elastic contact with the inner periphery of the holding member, and the inner periphery is in elastic contact with the outer periphery of the extending portion.