Hydraulic wheel drive system with selectively actuated motor
US8813487B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2012 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | Sep 6, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B7/003
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulic circuit for a vehicle includes a first loop that includes, in serial order, a first hydraulic pump, a first hydraulic line, a hydraulic motor and a second hydraulic line. A second hydraulic pump and a third valve control low pressure fluid from the second pump to the hydraulic motor casing. The low pressure fluid through the third valve maintains the motor pistons retracted when the motor is not being used. For actuating the motor, the third valve is actuated for disconnecting the second pump and relieving pressure from the motor casing. Low pressure is then provided to the first and second lines for extending the motor pistons. The first and second valves are then actuated for isolating the first and second lines from one another, and the first pump is used to power the motor. The first, second and third valves are advantageously solenoid cartridge valves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.