System pressure compensated variable displacement hydraulic motor
US5307630A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1991 |
| Grant date | May 3, 1994 |
| Priority date | — |
| Expiry date | Dec 16, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C13/38
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Paper drive unit instability that includes a variable displacement hydraulic motor (34), a rotary output (48), and a displacement controlling wobbler (36, 40) in the case of an aiding load can be avoided through the use of a double acting hydraulic actuator (42, 44) connected to the wobbler (36, 40) along with a control valve (30) including a single spool (80) connected to the motor (34), and wobbler control pilot valve (62) and to the actuator (42, 44) for a) controlling the speed and direction of rotation of the motor output (48); and b) controlling the actuator (42, 44) to maintain minimum displacement of the motor 34 when an aiding load occurs. System optimization can be achieved by changing the differential pressure setting in response to the available system pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.