Dual media oil filter

Patent metadata

Field	Value
Publication number	US-9764261-B2
Application number	US-201414219684-A
Country	US
Kind code	B2
Filing date	Mar 19, 2014
Priority date	Mar 19, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A suction filter for an automatic transmission utilizes two different types of filter media: a coarse filter media and a fine filter media. The two types of media are arranged in series within a housing such that fluid flows through only one of the two filter media. A hinge valve is arranged in series with the coarse media. The hinge valve passively opens in response to a pressure differential. The hinge valve defines a non-zero flow area when in the closed position and an increasing flow area as it opens. The flow restriction associated with the hinge valve permits a larger ratio of coarse media area to fine media, thereby decreasing the flow restriction when the oil is cold without decreasing the clean-up rate in normal operating conditions.

First claim

What is claimed is:

1. A filter assembly comprising:
a housing;
a coarse depth media within the housing;
a valve within the housing arranged in series with the coarse depth media wherein the valve is configured to establish a non-zero flow area in a closed position and to increase the flow area as the valve opens; and
a fine depth media within the housing arranged in parallel with the coarse depth media and the valve, the fine depth media having a greater resistance per unit area than a resistance per unit area of the coarse depth media.

2. The filter assembly of claim 1 wherein the fine and coarse filter media are pleated.

3. The filter assembly of claim 1 wherein the valve is passively controlled.

4. The filter assembly of claim 3 wherein the valve is configured to open in response to a differential pressure above a threshold.

5. The filter assembly of claim 4 wherein the valve is a hinge valve.

6. The filter assembly of claim 3 wherein the valve is configured to be closed at an operating temperature and flow rate.

7. A filter assembly comprising:
a housing;
a first filter media within the housing;
a valve within the housing arranged in series with the first filter media, the valve configured to establish a non-zero flow area in a closed position and to increase the flow area as the valve opens; and
a second filter media within the housing arranged in parallel with the first filter media and the valve.

8. The filter assembly of claim 7 wherein the second filter media has a greater resistance per unit area than a resistance per unit area of the first filter media.

9. The filter assembly of claim 7 wherein the valve is passively controlled.

10. The filter assembly of claim 9 wherein the valve is configured to open in response to a pressure differential above a threshold.

11. The filter assembly of claim 10 wherein the valve is a hinge valve.

12. The filter assembly of claim 11 wherein the valve is configured to be closed at an operating temperature and flow rate.

13. The filter assembly of claim 7 wherein the first filter media is a pleated depth media.

14. The filter assembly of claim 7 wherein the second filter media is a pleated depth media.

15. A filter assembly comprising:
a housing;
a first filter media within the housing;
a hinge valve within the housing arranged in series with the first filter media wherein the hinge valve is configured to establish a non-zero flow area in a closed position and to increase the flow area as the hinge valve opens; and
a second filter media within the housing arranged in parallel with the first filter media and the hinge valve.

16. The filter assembly of claim 15 wherein the second filter media has a greater resistance per unit area than a resistance per unit area of the first filter media.

17. The filter assembly of claim 16 wherein the first filter media is a pleated depth media.

18. The filter assembly of claim 16 wherein the second filter media is a pleated depth media.

Assignees

• Ford Global Tech Llc

Inventors

• Norris Kevin E
• Pekarsky Lev

Classifications

• B01D29/52

  in parallel connection · CPC title

• F16H57/0402

  Cleaning of lubricants, e.g. filters or magnets · CPC title

• B01D2201/188

  Multiple filtering elements having filtering areas of different size · CPC title

• B01D35/1573 Primary

  Flow control valves · CPC title

• F01M2001/1092

  comprising valves bypassing the filter · CPC title