Control valve device for a hydraulic user
US6247494A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 2000 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Mar 2, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87241
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control valve device for a hydraulic user includes an electrically actuated control valve that has a sliding spool for the control of the connection of at least one user channel that is in communication with the user with a delivery channel and a reservoir channel. A shutoff valve located in the user channel blocks a return flow from the user to the control valve. A pilot control valve actuates the shutoff valve. When the user channel is connected with the reservoir channel, the pilot control valve can be actuated to move the shutoff valve into the open position by an actuator element. The control valve device has a low actuation force for the deflection of the sliding spool and for the actuation of the pilot control valve. A gear train actuates the sliding spool and the actuator element. The gear train has an input element which is effectively connected with an electrical drive device and the output element which is in a driving connection with the sliding spool and is effectively connected with the actuator element. In one configuration, the output element is in connection by a connecting rod with the sliding spool and located on the output element is a cam disc which is connec…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.