JPH07190052A - Synthetic resin elastic bearing body - Google Patents

Abstract

PURPOSE:To provide a low and stable sliding resistance by integrally forming, by a connecting member, a shaft holding member having an elastic deforming part never making contact with a sliding surface making contact with a shaft and an outside holding member having an elastic deforming part never making contact with a contact surface fitted to a housing inner circumferential surface. CONSTITUTION:A shaft holding member 10 and an outside holding member 20 are circumferentially divided by axial slit parts 40, 41, the shaft holding member 10 has a sliding surface 11 partially making contact with a shaft 1 and an elastic deforming part 12 never making contact with the shaft on both circumferential sides. The outside holding member 20 has a contact surface 21 fitted to the housing inner circumferential surface on the outer circumferential surface and an elastic deforming part 22 never making contact with the housing inner circumferential surface on the side opposite to the slit 41. Both the holding members 10, 20 are radially fixed by a connecting members 30 having a prescribed space, and the connecting member 30 is extended to the axial end part, and integrally formed with a connecting member 31. The reaction of each elastic deforming part can work as a series spring to minimize the sliding resistance, and the fluctuation of the sliding resistance by the dispersion in dimension of the axial outer diameter and the housing bore diameter can be also minimized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic bearing made of synthetic resin for light load, which is used by holding a shaft slidably and fixing an outer peripheral surface to an inner peripheral surface of a cylindrical housing. Bearings suitable for steering rack bushes and the like.

[0002]

2. Description of the Related Art A conventional synthetic resin elastic bearing is disclosed and generally used, for example, as shown in FIGS. (For example, actual fair 1-1890)

[0003]

According to the conventional synthetic resin elastic bearing of this type, as shown in FIG. 8, a gap Δt with the inner surface of the housing provided outside the sliding surface with the shaft is slid. The elastic member is elastically supported as a bending allowance of the moving member and absorbs the variation between the outer diameter dimension of the shaft and the inner diameter dimension of the housing to give an appropriate sliding surface pressure to the sliding surface of the shaft. However, in the prior art, since the sliding member P is in direct contact with the inner peripheral surface of the housing and the outer peripheral surface of the shaft, the sliding surface pressure is likely to change due to variations in the dimensions, the sliding resistance is large, and It was stable. In order to solve this, if Δt is increased and the bending of the sliding member is set to be large, permanent deformation of the resin material itself easily occurs, and backlash easily occurs due to a change with time.

[0004]

In order to achieve the above object, a synthetic resin elastic bearing according to the present invention is divided into a plurality of slits provided in the axial direction, and each divided portion is a shaft. A shaft holding member having a sliding surface that abuts against the shaft and an elastically deformable portion that does not contact the shaft; and an outer holding member that has an abutting surface that is fitted and inserted into the housing inner peripheral surface and an elastically deformable portion that does not contact the housing inner peripheral surface. The shaft holding member and the outer holding member are integrally formed by a connecting member that connects the shaft holding member and the outer holding member at predetermined intervals in the radial direction and the circumferential direction.

Also, one end of the outer peripheral surface of the outer holding member in the axial direction may be provided side by side with the connecting member with a gap with respect to the inner peripheral surface of the housing, and the inner peripheral surface of the inner retaining member may be arranged in the axial direction. The connecting member may be provided side by side with a gap at one end with respect to the outer peripheral surface of the shaft.

[0006]

The elastic bearing body made of synthetic resin constructed as described above absorbs the variation in the inner diameter of the housing due to the radial deflection of the elastically deformable portion provided on the outer holding member, and is provided on the inner holding member. By absorbing the variation in the external dimensions of the shaft due to the bending of the elastically deformed portion,
The sliding surface pressure is less susceptible to fluctuations due to dimensional variations, and therefore a substantially low and stable sliding resistance can be obtained.

[0007]

Embodiments will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. In FIG. 1, reference numerals 40 and 41 denote slit portions provided in the axial direction, and the shaft holding member 10 and the outer holding member 20 are divided in the circumferential direction. A part of the shaft holding member 10 has a sliding surface 11 that is partially in contact with the shaft 1 and slides, and elastically deforming portions 12 that are not in contact with the shaft are provided on both sides in the circumferential direction. Further, the outer holding member 20 has an abutting surface 21 fitted to the inner peripheral surface of the housing on a part of the outer peripheral surface thereof, and an elastically deformable portion 22 not contacting the inner peripheral surface of the housing is provided on the opposite side of the slit 41. .

The shaft holding member 10 and the outer holding member 2
0 is fixed in the radial direction by a connecting member 30 that connects them at a predetermined interval. Further, as shown in FIGS. 2 and 3, the connecting member 30 extends to the axial end portion and serves as a bearing body by a portion 31. It is formed integrally. Moreover, FIG.
In this case, the connecting member 30 has a space 3 with respect to the inner peripheral surface of the housing.
2, and the connecting member 31 is formed in a state in which there is a gap 33 with the outer peripheral surface of the shaft.

In another embodiment, shown in FIGS. 4-6, FIG.
Shaft holding member 1 divided by slit 40 in
Reference numeral 0 denotes a sliding surface 11 that comes into contact with the shaft at both ends in the circumferential direction, and an elastically deforming portion 12 that does not come into contact with the shaft. The outer holding member 20 divided by the slit 41 is fitted into the inner circumferential surface of the housing. It has contact surfaces 21A and 21B and elastically deformable portions 22 and 22A that are not in contact with the inner peripheral surface of the housing. The shaft holding member 10 and the outer holding member 20 are fixed in the radial direction by a connecting member 30.
As shown in FIG. 3, the connecting member 31 is integrally formed at the end in the axial direction. In the present invention, each of the contact portions 1 provided on the shaft holding member 10 and the outer holding member 20.
1, 21 and the elastically deformable deformable portions 12, 22 can be appropriately selected in position, width and number according to the purpose.
Various modifications of the connecting members 30 and 31 can be implemented without departing from the scope of the present invention.

[0010]

The present invention has the following effects by being configured as described above.
Since the shaft holding member and the outer holding member independently contact the shaft outer peripheral surface and the housing inner peripheral surface, respectively, the reaction force of the elastically deformed portion provided on each acts as a series spring, and as a result, The force applied to the sliding surface of is reduced, the sliding resistance can be reduced, and the amount of elastic deformation is large.
Can be set. Moreover, it is possible to reduce the fluctuation of the sliding resistance caused by the variation in the outer diameter of the shaft and the variation in the inner diameter of the housing. Further, when it is desired to regulate the displacement at the time of a large load in the direction perpendicular to the axis, the above effect is lost by setting the radial gap (Δt in FIG. 1) on the inner peripheral surface and the outer peripheral surface of the connecting member to a desired dimension. It becomes possible to obtain it appropriately without.

[Brief description of drawings]

FIG. 1 is a sectional view in a direction perpendicular to an axis, showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of planes OA and OB in FIG.

FIG. 3 is an explanatory diagram showing appearances of a slit portion and a connecting portion in FIG.

FIG. 4 is a sectional view in the direction perpendicular to the axis, showing another embodiment of the present invention.

5 is a cross-sectional view of the OA and OB planes of FIG.

FIG. 6 is an explanatory view showing a part of the external appearance of the slit portion and the connecting portion of FIG.

FIG. 7 is a perspective view of the related art.

FIG. 8 is a sectional view taken along the direction perpendicular to the axis of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 shaft 2 housing 10 shaft holding member 11 contact surface (sliding surface) with shaft 12 elastically deforming portion of shaft holding member 20 outer holding member 21 contact surface with housing 22 elastically deforming portion of outer holding member 30, 31 Connecting member 32, 33 Void 40, 41 Slit Δt Void

Claims (3)

[Claims] 1. An elastic bearing made of synthetic resin, which is slidably supported by an inner peripheral surface and fixed to an inner peripheral surface of a housing having an outer peripheral surface, is provided in an axial direction. The slit is divided into a plurality of parts in the circumferential direction by a slit, and each of the divided parts has a sliding surface that comes into contact with the shaft and a shaft holding member that has an elastically deformable portion that does not come into contact with the shaft, and a contact that is fitted into the inner peripheral surface of the housing. And an outer holding member having an elastically deformable portion that is not in contact with the inner peripheral surface of the housing, and connects the shaft holding member and the outer holding member at a predetermined interval in the radial direction and the circumferential direction. An elastic bearing body made of synthetic resin, which is integrally formed of a member. 2. The elastic bearing body made of synthetic resin according to claim 1, wherein one end in the axial direction of the outer peripheral surface of the outer holding member is provided with the connecting member with a gap with respect to the inner peripheral surface of the housing. . 3. The elastic synthetic resin according to claim 1, wherein one end of the inner peripheral surface of the inner holding member in the axial direction is provided with the connecting member with a gap with respect to the outer peripheral surface of the shaft. Bearing body.