Hydraulic drive traveling system
US5177964A · kind A · utility
34Cited by
11References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1990 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Jun 25, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/47
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic drive traveling system has a pressure compensated low control valve connected between a hydraulic pump and a variable displacement type hydraulic motor for controlling a flow rate of the hydraulic fluid supplied to the motor. The flow rate is controlled in accordance with the delivery pressure of the pump and demanded traveling speed of the motor. When the delivery pressure of the pump is at a high level, the motor is shifted to a first capacity. When the delivery pressure of the pump is low, the motor is shifted to either the second capacity or the first capacity depending upon the demanded traveling speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.