Power transmission
US4537029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1982 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Sep 23, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B21/087
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An electrohydraulic control system which includes first and second electrically controlled fully variable hydraulic pumps adapted to be driven by the vehicle engine. In the specific embodiment of the invention herein disclosed, the first pump is coupled to the steering and braking control valves, and the second pump is coupled to the bucket and hoist control valves. An electrically controlled poppet valve selectively interconnects the respective pump outputs. Operator-responsive controllers, namely a bucket/hoist joy-stick controller, a vehicle propulsion controller and a steering controller, provide associated electrical signals as respective functions of operator demand. Electrically operated valves control application of hydraulic fluid to the bucket and hoist drive mechanisms, and pressure and position sensors are connected to such valves and actuating mechanisms. An electronic controller receives inputs indicative of operator demands, pump outputs, and operation at the hoist and bucket, and selectively controls or modulates the cartridge valve, the pumps, and the hoist and bucket valves for operation at optimum efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.