Operating speed change-over device
US5085052A · kind A · utility
5Cited by
10References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1991 |
| Grant date | Feb 4, 1992 |
| Priority date | — |
| Expiry date | Feb 26, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/46
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An operating speed change-over device is equipped with an automatic speed change-over valve which opens and closes a pilot fluid line that connects a pilot port of a capacity change-over valve of a capacity-variable hydraulic motor to a pilot pump. The automatic speed change-over valve has one pilot port that is connected to a pressurized fluid feed line leading to the hydraulic motor and has another pilot port connected to the return fluid line of the hydraulic motor. The automatic speed change-over valve is changed over by an effective differential pressure between the two fluid lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.