Synthetic resin-made sliding bearing

Patent metadata

Field	Value
Publication number	US-10138931-B2
Application number	US-201515520576-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	Oct 27, 2014
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A synthetic resin-made sliding bearing 1 include a synthetic resin-made upper casing 2 , a synthetic resin-made lower casing 3 , and a thrust sliding bearing piece 4 serving as a synthetic resin-made thrust sliding bearing interposed between the lower casing 3 and the upper casing 2 fitted over the lower casing 3.

First claim

The invention claimed is:

1. A combination mechanism of a synthetic resin-made sliding bearing and a shaft,
said synthetic resin-made sliding bearing comprising:
a synthetic resin-made upper casing including an annular upper plate portion having a first inner peripheral surface, a cylindrical first suspended portion formed integrally on a lower surface of the upper plate portion, and a cylindrical engaging suspended portion formed integrally on the lower surface of the upper plate portion so as to form an annular upper outer groove by an inner peripheral surface thereof in cooperation with an outer peripheral surface of the first suspended portion;
a synthetic resin-made lower casing including an annular lower plate portion having a second inner peripheral surface, a cylindrical portion formed integrally on a lower surface of the lower plate portion and having a third inner peripheral surface, a cylindrical first projecting portion formed integrally on an upper surface of the lower plate portion, and a cylindrical engaging protruding portion formed integrally on the upper surface of the lower plate portion so as to form an annular lower outer groove by an inner peripheral surface thereof in cooperation with an outer peripheral surface of the first projecting portion; and
a synthetic resin-made thrust sliding bearing piece disposed in a space between said upper casing and said lower casing such that an upper surface thereof is brought into slidable contact with the lower surface of the upper plate portion of said upper casing fitted over said lower casing, while a lower surface thereof is brought into slidable contact with the upper surface of said lower plate portion,
said shaft being inserted in circular holes defined by the first to the third inner peripheral surfaces,
the first suspended portion being disposed in the lower outer groove with a radial first clearance and a radial second clearance between an inner peripheral surface thereof and an outer peripheral surface thereof, on the one hand, and the outer peripheral surface of the first projecting portion and the inner peripheral surface of the engaging protruding portion, on the other hand, respectively,
the engaging suspended portion is disposed radially outwardly of the engaging protruding portion with a radial third clearance between the inner peripheral surface thereof and an outer peripheral surface of the engaging protruding portion, and
an outer peripheral side passage formed by the first suspended portion, the first projecting portion, the engaging suspended portion, and the engaging protruding portion allows a radially outer peripheral portion of the space to communicate with an outside,
a radial minimum width of each of the first to third clearances being equal to or greater than a radially relatively displaceable amount of said lower casing with respect to said upper casing which is regulated by the shaft.

2. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 1 , wherein the first inner peripheral surface has a same diameter as a diameter of the second inner peripheral surface.

3. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 1 , wherein the third inner peripheral surface has the same diameter as the diameter of the second inner peripheral surface and is flush with the second inner peripheral surface.

4. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 1 , wherein the radial minimum width of each of the first to third clearances is equal to or greater than a smaller one of two radial clearances between the radial second and third inner peripheral surfaces, on the one hand, and an outer peripheral surface of the shaft, one the other hand, respectively.

5. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 1 , wherein said upper casing further includes a cylindrical second suspended portion formed integrally on the lower surface of the upper plate portion so as to form an annular upper recess by the outer peripheral surface thereof in cooperation with the lower surface of the upper plate portion and the inner peripheral surface of the first suspended portion.

6. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 1 , further comprising a second projecting portion formed integrally on the upper surface of the lower plate portion and having an outer peripheral surface for forming an annular lower recess in cooperation with an inner peripheral surface of the first projecting portion and the upper surface of the lower plate portion, wherein said thrust sliding bearing piece is disposed in the lower recess in the space.

7. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 6 , wherein the second projecting portion has the inner peripheral surface which has a same diameter as the diameter of the second inner peripheral surface and is flush with the second inner peripheral surface.

8. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 6 , wherein said upper casing further has a cylindrical second suspended portion formed integrally on the lower surface of the upper plate portion so as to form an annular upper recess by the outer peripheral surface thereof in cooperation with the lower surface of the upper plate portion and the inner peripheral surface of the first suspended portion, and
wherein the second projecting portion is integrally formed on the upper surface of the lower plate portion in such a manner as to be located radially outwardly away from the second inner peripheral surface,
the second suspended portion is suspended toward the upper surface of the lower plate portion so as to form a radial fourth clearance between the outer peripheral surface thereof and the inner peripheral surface of the second projecting portion, and
an inner peripheral side passage formed by the second suspended portion and the second projecting portion allows a radially inner peripheral portion of the space to communicate with the outside,
a radial minimum width of the fourth clearance being equal to or greater than the relatively displaceable amount.

9. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 8 , wherein the radial minimum width of the fourth clearance is equal to or greater than the smaller one of the two radial clearances between the radial second and third inner peripheral surfaces, on the one hand, and the outer peripheral surface of the shaft, one the other hand, respectively.

10. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 8 , wherein the second suspended portion has an inner peripheral surface which has a same diameter as the diameter of the first inner peripheral surface and is flush with the first inner peripheral surface.

11. The combination mechanism of the synthetic resin-made sliding bearing and the shaft according to claim 8 , wherein said lower casing further has a cylindrical third projecting portion formed integrally on the upper surface of the lower plate portion so as to form the annular lower inner groove by an outer peripheral surface thereof in cooperation with the inner peripheral surface of the second projecting portion,
the second suspended portion is disposed in the lower inner groove with a radial fifth clearance between an inner peripheral surface thereof and the outer peripheral surface of the third projecting portion and is formed integrally

Assignees

• Oiles Industry Co Ltd

Inventors

• Kurose Kouhei
• Saito Katsunori

Classifications

• F16C33/02

  Parts of sliding-contact bearings · CPC title

• F16C33/20 Primary

  Sliding surface consisting mainly of plastics (F16C33/22 - F16C33/28 take precedence) · CPC title

• F16C17/04 Primary

  for axial load only · CPC title

• F16C17/022 Primary

  with a pair of essentially semicircular bearing sleeves · CPC title

• B60G15/068

  specially adapted for MacPherson strut-type suspension · CPC title