Fluid pumping system for automatic transmission
US6361287B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 2000 |
| Grant date | Mar 26, 2002 |
| Priority date | — |
| Expiry date | Sep 25, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/0025
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fluid pumping system for an automatic transmission includes a primary pump operable to draw fluid from a sump to a main delivery line to a main hydraulic circuit of the transmission. A main circuit pressure regulator regulates pressure to the main circuit and exhausts excess fluid to a secondary delivery line to a secondary hydraulic circuit of the transmission. A secondary pump operates to draw fluid from the suction line to a discharge line. A check ball valve operates to permit one way flow from the discharge line to the secondary delivery line. A secondary circuit pressure regulator regulates pressure to the secondary circuit and operates to exhaust flow from the discharge line to a return line or from the discharge line and the secondary delivery line wherein the return line is in continuous fluid communication with the suction line to reduce hydraulic horsepower expended by the secondary pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.