Randy Erickson

US Patent:

50019015, Mar 26, 1991

Filed:

Oct 4, 1988

Appl. No.:

7/253189

Inventors:

Randy D. Erickson - Rockford IL
Ronald D. Kunkel - Rockford IL

Assignee:

Sundstrand Corporation - Rockford IL

International Classification:

F01M 102
F16H 3904

US Classification:

60336

Abstract:

An improved hydraulic apparatus is disclosed having a hydraulic device (14) receiving conditioned hydraulic fluid directly from an inlet port (62) in a case (12) full of hydraulic fluid (16) with the conditioned hydraulic fluid having a characteristic which is better than the characteristic of the fluid within the case. The characteristic may be that the hydraulic fluid is cooled to a temperature below the temperature of the hydraulic fluid within the case, is filtered, or is deaerated. Cooled hydraulic fluid is supplied from a heat exchanger (58) in fluid communication between an outlet port of the case and the inlet port of the case to supply the hydraulic fluid contained within the case. The hydraulic fluid is filtered by a filter (54) external to the case. A deaerator (65) may be located in a fluid circuit external to the case between a scavenge pump (50) and the inlet port (67).