Constant output fluid pump
US4334832A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1980 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Mar 6, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B1/303
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable displacement rotary pump includes a tiltable cam plate which varies the pump displacement as a function of the fluid pressure in a control chamber. The pump pumps fluid to a fluid motor via an orifice in an outlet passage. A spool valve meters fluid to the control chamber in response to the differential pressure across the orifice. Pressure on one side of the orifice acts upon the spool valve in a feedback chamber remote from the outlet passage. The orifice is defined by an annular space between the wall of the outlet passage and neck portion of the spool valve. A feedback passage in the spool valve communicates fluid pressure from the one side of the orifice to the feedback chamber. A leakage flow path extends through a bearing to provide for automatic bearing lubrication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.