Fluid motor apparatus
US4037520A · kind A · utility
3Cited by
7References
8Claims
0Family size
Inventor
Key dates
| Filing date | Aug 29, 1975 |
| Grant date | Jul 26, 1977 |
| Priority date | — |
| Expiry date | Aug 29, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L25/066
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improved fluid motor having only two moving components, a reciprocatable piston and a fluid actuated valve spool. The piston is supported for linear movement in a piston support bore of a barrel assembly, and is moved in alternating directions by the operation of selected porting of a pressure fluid selectively admitted against differential piston pressure faces. The valve spool is disposed in an inner bore in the piston and is alternately driven in opposing directions by automatically controlled and selective application of fluid pressure. The fluid motor experiences no mechanical impact between the valve spool and the piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.