# US 5,707,519 A · Centrifugal oil filter with particle retention

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- Number: US 5,707,519 A
- Document ID: US5707519A
- Status: Granted
- Kind: A
- Application number: 08/757,312
- Filed: 1996-11-27
- Granted: 1998-01-13
- Earliest claimed: 1996-11-27
- Assignees: Caterpillar Inc.
- Inventors: Christopher O. Miller; J. W. Burrows
- Web page: https://patentgrep.com/patent/US5707519A

## CPC

- B04B 5/005: {Centrifugal separators or filters for fluid circulation systems, e.g. for lubricant oil circulation systems}
- F01M 2013/0422: {Separating oil and gas with a centrifuge device}
- B04B: CENTRIFUGES (high-speed drum mills B02C19/11; domestic spin driers D06F; analysing, measuring or monitoring physical or chemical properties of samples during centrifuging, see the relevant subclasses for these procedures, e.g. G01N)
- F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING

## Abstract

A centrifugal oil filter includes a housing having a rotatable bowl disposed in a first fluid chamber and rotatably disposed about a shaft extending through the first fluid chamber. The rotatable bowl has a flow directing member connected generally at the bottom thereof to define a particle collection basin and the flow directing member extends upwardly to form a passageway adjacent the shaft so that the fluid flow within the rotatable bowl is directed to a pair of nozzles which act to rotate the rotatable bowl responsive to fluid flow therethrough. A particle retention insert is made of a cellular structure and disposed in the particle collection basin. The particle retention insert functions to receive foreign particles within the cellular structure and retain them therein by protecting the particles from the fluid flow within the rotatable bowl.

## Claims

### Claim 1

A centrifugal oil filter adapted for use in a fluid system having a source of fluid flow, comprising:
a housing defining a first fluid chamber, an inlet port, and an outlet port in fluid communication with the first fluid chamber;
a shaft disposed in the housing and extends through the first fluid chamber, a passage is defined in the shaft along a portion of its length and in open communication with the inlet port, and a transverse opening is defined in the shaft to interconnect the passage with the exterior of the shaft;
a rotatable bowl having a bottom portion and disposed in the first fluid chamber of the housing and operative to rotate about the hollow shaft, the rotatable bowl defining a second fluid chamber in fluid communication with transverse opening in the shaft, a pair of diametrically opposed nozzles disposed in the bottom portion of the rotatable bowl and operative to communicate fluid from the second fluid chamber to the first fluid chamber to force the rotatable bowl to rotate, and a flow directing member connected to the bottom portion of the rotatable bowl generally above the pair of nozzles to form a particle collection basin on the side of the flow directing member opposite the pair of nozzles, the flow directing member extending radially inward to a position which is spaced from the shaft to define a substantially unobstructed passageway therebetween so that the substantially unobstructed passageway allows substantially unobstructed fluid commuication between the portion of the second chamber above the flow directing member, and the pair of nozzles generally below the flow directing member, said substantially unobstructed passageway being spaced upwardly from the point of connection of the flow directing member to the bottom portion; and
a particle retention insert disposed in the particle collection basin in intimate contact with the flow directing member and spaced from the shaft.

### Claim 2 (depends on 1)

The centrifugal oil filter of claim 1 wherein the particle retention insert is composed of a cellular structure.

### Claim 3 (depends on 2)

The centrifugal oil filter of claim 2 wherein the particle retention insert is composed of metal fibers interconnected together.

### Claim 4 (depends on 2)

The centrifugal oil filter of claim 2 wherein the particle retention insert is made from a synthetic media having a cellular structure.

### Claim 5 (depends on 2)

The centrifugal oil filter of claim 2 wherein the rotatable bowl has an outer wall and the particle retention insert has an upper surface that is angled upwardly from the passageway to the outer wall of the rotatable bowl.