Automatic pressure control device for hydraulic actuator driving circuit
US5107753A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1991 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Aug 8, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87193
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An automatic pressure control device built in a hydraulic actuator driving circuit for driving a plurality of actuators of a construction machine or the like by a single hydraulic pump through respective pilot changeover valves is provided for automatically shuttling the changeover valve of each actuator to reduce its demanded flow rate and uniformly control the operation speeds of all actuators. To this end, the device is arranged to drain an excessive flow rate of the hydraulic pump through a series connection of a flow rate control valve controlled by the highest load pressure of the actuators and a resistance passage including a shuttle and to control the pilot pressure of each pilot changeover valve in response to a pressure at the junction of the series connection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.