# US 8,770,844 B2 · Self-lubricating bushing for a joint, which is intended to be mounted on a shaft

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- Number: US 8,770,844 B2
- Document ID: US8770844B2
- Status: Granted
- Kind: B2
- Application number: 13/581,530
- Filed: 2011-03-16
- Published: 2013-03-14
- Granted: 2014-07-08
- Earliest claimed: 2010-03-29
- Assignees: H.E.F.
- Applicants: Emmanuel Masse; Patrick Villemagne; Eric Chaduiron
- Inventors: Emmanuel Masse; Patrick Villemagne; Eric Chaduiron
- Web page: https://patentgrep.com/patent/US8770844B2

## CPC

- F16C 33/201: {Composition of the plastic}
- F16C 33/74: of sliding-contact bearings
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

This bush is made out of a composite material that has a modulus of elasticity of between 500 and 6000 N/mm2, said bush having at least one lip formed directly at the time of manufacture as an overrun edge of its bore to act as a leak-tight or protective barrier after mounting on the shaft by creating a tightening effect between the inside diameter of said lip or said lips, and the outside diameter of said shaft.

## Claims

### Claim 1

Self-lubricating hinge connection bushing for mounting on a shaft for translational and/or rotational guidance, comprising a composite material having a modulus of elasticity of between 500 and 6000 N/mm2 allowing deformation upon application of a load and then a return to an initial state upon load removal, wherein the composite material comprises an epoxy or vinylester or polyester resin incorporating reinforcements of thermoplastic fibers with a thickness of between 0.05 and 0.5 mm and including lubricating fillers between 5 and 50% by volume, said bushing having at least one lip formed directly at a time of manufacture as an overrun edge of a bore of a body of the bushing to act as a leak-tight or protective barrier after mounting on the shaft by creating a tightening effect between an inside diameter of said at least one lip, and an outside diameter of said shaft, wherein the tightening between the inside diameter of the at least one lip and the outside diameter of the shaft is between 0.05 and 4 mm.

### Claim 2 (depends on 1)

Bushing as claimed in claim 1, wherein the tightening between the inside diameter of the at least one lip and the outside diameter of the shaft is between 0.2 and 2 mm.

### Claim 3 (depends on 1)

Bushing as claimed in claim 1, wherein the at least one lip is formed at at least one end of the bore.

### Claim 4 (depends on 1)

Bushing as claimed in claim 1, wherein the at least one lip is formed starting from an internal groove extending radially from the bore into the body of the bushing.

### Claim 5 (depends on 1)

Bushing as claimed in claim 1, wherein the at least one lip is formed directly starting from the bore.

### Claim 6 (depends on 1)

Bushing as claimed in claim 1, wherein the at least one lip defines, with a periphery of the body of the bushing, a circular cut-out.

### Claim 7 (depends on 1)

Bushing as claimed in claim 1, wherein the at least one lip extends axially outward beyond the body of the bushing and defines a shoulder of reducing radial extent with a periphery of the body of the bushing.

### Claim 8 (depends on 1)

Bushing as claimed in claim 1, wherein radial thickness of the lip and radial thickness of the body of the bushing are equal.