Rotary hydraulic machine
US4175472A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1977 |
| Grant date | Nov 27, 1979 |
| Priority date | — |
| Expiry date | Dec 9, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B1/2021
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A rotary hydraulic pump or motor has a piston-carrying rotor having a face engaging a port plate which includes a high pressure port. A valve arrangement is responsive to the pressures in the high pressure port and in successive ones of the rotor bores to provide that variation in these pressures causes variation of the position, relative to top-dead-center, at which successive rotor bores communicate with the high pressure port through by-pass passages, and thereby substantially equalize the pressures in the bores and the high pressure port. The port plate and rotor also include passages by which the pressures in the rotor bores can be increased rapidly after their respective top-dead-center positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.