Dual variable displacement over-center hydraulic motor power drive unit
US5406794A · kind A · utility
8Cited by
11References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 14, 1993 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | May 14, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF03C1/0639
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The use of two variable displacement over-center hydraulic motors 12,14 in conjunction with a torque-summing gearbox 16 for maintaining the torque output of a power drive unit 10 in a typical closed loop control system is described. The torque output of the power drive unit 10 is maintained as either the sum or the difference of the torque outputs produced by the two variable displacement over-center hydraulic motors 12,14, depending upon the required system performance. This present invention use overcomes the problems associated with a single variable displacement over-center hydraulic motor operating in the stick-slip zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.