Control system for hydraulic pumps of a civil machine
US4507057A · kind A · utility
20Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1983 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Feb 18, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/6309
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A civil machine having a flow-rate controller which applies a preset signal instead of a normal flow-rate signal to a variable type hydraulic pump when delivery pressure of the hydraulic pump exceeds a preset pressure value. The normal flow-rate signal corresponds to the position of an operating lever. The preset signal has a value of minimum flow rate to hold a working tool in a certain posture. With this control system, pressure loss and temperature rise in hydraulic operating oil as well as fuel consumption of the machine can be reduced and cycle time of the work can be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.