Hydraulic pump system with reduced cold start parasitic loss
US8096781B2 · kind B2 · utility
1Cited by
25References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2008 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Feb 21, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B1/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A machine hydraulic pump system including at least one hydraulic pump driven to pressurize hydraulic fluid. A drain port is in fluid communication with an interior lubricating cavity of the pump. A selectively activatable flow control member is in flow-controlling relation to the drain port. The selectively activatable flow control member is adapted to move from a fluid containment condition to a fluid withdrawal condition prior to activation of the pump to at least partially evacuate lubricating liquid from the interior of the pump in response to the temperature of the lubricating liquid dropping below a predefined lower limit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.