Device for controlling a hydraulic motor
US5469703A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1994 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Jun 10, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/8755
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A device for controlling a hydraulic motor (10) comprises a directional valve (15) connected to a pressure fluid pump (11; 50) via a feed passage (17) and a pilot valve (19) activated safety shut-off valve (18) incorporated in the pressure fluid feed passage (17) between the pump (11; 50) and the directional valve (15) and shiftable from a normally open position to a closed position to, thereby, block the fluid communication between the pump (11; 50) and the directional valve (15) in emergency situations. A shunt valve (16) for short circuiting at least a part of the pump flow to a tank or, alternatively a displacement adjusting means (51) of a variable displacement pump (50) are activated by a load sensing pressure derived from a load sensing port (15e) on the directional valve (15), which load sensing pressure is discharged to tank (12) via the shut-off valve (18) as the latter is shifted to its closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.