# US 7,607,906 B2 · Gear pump arrangement with erosion resistant insert

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- Number: US 7,607,906 B2
- Document ID: US7607906B2
- Status: Granted
- Kind: B2
- Application number: 11/433,098
- Filed: 2006-05-12
- Published: 2007-11-15
- Granted: 2009-10-27
- Earliest claimed: 2005-05-13
- Assignees: Goodrich Control Systems Limited
- Inventors: Martin Kenneth Yates; Glyn Edward Dixon
- Web page: https://patentgrep.com/patent/US7607906B2

## CPC

- F04C 2/18: with similar tooth forms (F04C2/16 takes precedence)
- F01C 21/02: Arrangements of bearings (bearing constructions F16C)
- F04C 2/086: {Carter}
- F04C 15/0026: {Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps}
- F16C 35/02: in the case of sliding-contact bearings
- F04C 2230/21: by casting
- F04C 2240/50: Bearings
- F04C 2240/52: for assemblies with supports on both sides
- F05C 2201/021: Aluminium
- F05C 2201/903: Aluminium alloy, e.g. AlCuMgPb F34,37
- F16C 17/04: for axial load only
- F16C 33/12: Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C 2360/42: Pumps with cylinders or pistons
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F05C: INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES

## Abstract

A gear pump arrangement comprising a pair of intermeshing gears (16, 18) located between bearing blocks (24) and rotatable to pump fluid from an inlet (12) to an outlet (14), wherein at least one of the bearing blocks (24) comprises a body (28) formed with a recess (32) within which an insert (34) is located, the recess (32) and insert (34) being shaped so as to be of smaller dimensions at a bearing surface (30) of the bearing block (24) than at a point remote therefrom.

## Claims

### Claim 1

A gear pump arrangement comprising a pair of intermeshing gears located between bearing blocks and rotatable to pump fluid from an inlet to an outlet, the bearing blocks having a bearing surface facing the gears, wherein at least one of the bearing blocks comprises a body formed with a recess within which an insert is located, the recess and insert being shaped so as to be of smaller dimensions at the bearing surface of the bearing block than at a point remote therefrom within the bearing block, wherein the recess and insert are both of stepped generally cylindrical or part-cylindrical form.

### Claim 2 (depends on 1)

An arrangement according to claim 1, wherein the steps of the stepped recess and insert are of tapering form.

### Claim 3 (depends on 1)

An arrangement according to claim 1, wherein the recess and insert are of tapering shape.

### Claim 4 (depends on 1)

An arrangement according to claim 1, wherein the insert is of aluminium bronze.

### Claim 5 (depends on 1)

An arrangement according to claim 1, wherein the insert is flush or substantially flush with the bearing surface.

### Claim 6 (depends on 1)

An arrangement according to claim 1, wherein the bearing block is provided with aluminium filled recess.

### Claim 7 (depends on 6)

An arrangement according to claim 6, wherein the aluminium located within the aluminium filled recess serves to resist release of the insert from its recesses.

### Claim 8

A bimetallic bearing block for use in a gear pump arrangement having a pair of intermeshing gears located between bearing surfaces of bearing blocks and rotatable to pump fluid from an inlet to an outlet, the bearing block comprising a body defining a recess within which an insert is located, the insert and recesses being shaped so as to be of small dimensions at the bearing surface of the bearing block than at a point remove therefrom within the bearing block, wherein the recess and insert are both of stepped generally cylindrical or part-cylindrical form.

### Claim 9

A method of manufacture of a bimetallic bearing block having a bearing surface, the method comprising providing a recess in a bearing block body, introducing an insert into the recess of the bearing block body and flame spraying aluminium onto the bearing block body to resist release of the insert from the recess, the insert and recess being shaped so as to be of smaller dimensions at the bearing surface of the bearing block than at a point remote therefrom within the bearing block, wherein the recess and insert are both of stepped generally cylindrical or part-cylindrical form.