Rotary hydraulic vane pump with undervane passages for priming
US4386891A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1981 |
| Grant date | Jun 7, 1983 |
| Priority date | — |
| Expiry date | Apr 23, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2270/701
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A balanced vane type hydraulic pump has a thrust plate and a pressure plate which cooperate with a cam ring, rotor and vanes to provide a plurality of pump chambers. During pump operation, fluid trapped under the vanes flows from under the vanes at the discharge port, as the vane recedes, to under the vanes at the inlet port to assist vane extension and improve pump priming. The undervane fluid passes through grooves in both plates with the groove in the pressure plate being in communication with the discharge flow of the pump. The grooves incorporate restrictions to the undervane fluid flow between the discharge and inlet positions of the vanes with the restriction in the thrust plate permitting more fluid flow than the restriction in the pressure plate to ensure that most of the fluid will pass through the rotor under the vanes in the inlet position to assist in vane extension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.