# US 4,394,275 A · Composite material for sliding surface bearings

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- Number: US 4,394,275 A
- Document ID: US4394275A
- Status: Granted
- Kind: A
- Application number: 06/283,394
- Filed: 1981-07-15
- Granted: 1983-07-19
- Earliest claimed: 1980-07-19
- Assignees: Karl Schmidt GmbH
- Inventors: Wolfgang Bickle; Rolf Funke; Rolf Pfoh
- Web page: https://patentgrep.com/patent/US4394275A

## CPC

- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- B32B 15/08: of synthetic resin
- F16C 33/106: {Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid}
- F16C 33/201: {Composition of the plastic}
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2305/026: Porous
- B32B 2305/80: Sintered
- B32B 2311/30: Iron, e.g. steel
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

A composite material for sliding surface bearings comprises a gacking shell of steel, which is covered by a bearing metal layer of sintered porour bronze having a porosity of 25 to 45%. The voids of the bronze layer are filled with a fluorocarbon-lead mixture. The bearing metal layer is covered by an anti-friction layer consisting of the fluorocarbon-lead mixture in a thickness of, for example, 30 to 500 microns. To permit of a machining of the anti-friction layer the bronze layer has a thickness of 250 to 350 microns and a porosity of 25 to 45% and the fluorocarbon-lead mixture comprises 30 to 60% by weight polyvinylidene fluorinde and 20 to 50% by weight lead.

## Claims

### Claim 1

A composite material for a sliding surface bearing comprising a supporting shell of steel, which is covered by a bearing metal layer comprising sintered porous bronze having a porosity of 25 to 45%, the voids of which are filled with a fluorocarbon-lead mixture comprising 30 to 60% by weight polyvinylidene fluoride and 20 to 50% by weight lead, said bearing metal layer in turn covered by an anti-friction layer comprising 30 to 60% by weight polyvinylidene fluoride and 20 to 50% by weight lead, said anti-friction layer having pockets or grooves therein containing a lubricant.

### Claim 2 (depends on 1)

A composite material according to claim 1 wherein the covering layer of polyvinylidene fluoride and lead has a thickness of 30 to 500 microns.

### Claim 3 (depends on 2)

A composite material according to claim 2 wherein said bearing metal layer has a thickness of 250 to 350 microns.

### Claim 4 (depends on 3)

A composite material according to claim 3 wherein said fluoro-carbon-lead mixture additionally contains 5 to 30% by weight polytetrafluoroethylene.

### Claim 5 (depends on 4)

A composite material according to claim 4 wherein the fluoro-carbon-lead mixture filling said voids comprises at least 50% by weight of polyvinylidene fluoride and 40% be weight lead.

### Claim 6 (depends on 5)

A composite material according to claim 5 wherein the fluorocarbon-lead mixture of said covering layer comprises at least 50% be weight polyvinylidene fluoride and 40% by weight lead.

### Claim 7 (depends on 3)

A composite material according to claim 3, wherein the fluorocarbon-lead mixture of said covering material and the fluorocarbon-lead mixture filling said voids, comprises 38% by weight polyvinylidene fluoride, 14% by weight polytetrafluoroethylene and 38% by weight lead.

### Claim 8 (depends on 3)

A bearing made of the composite material of claim 3.