Variable delivery pump control system
US4212164A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1978 |
| Grant date | Jul 15, 1980 |
| Priority date | — |
| Expiry date | Dec 6, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/438
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A variable delivery pump has a pump control mechanism in a housing secured thereto for governing directional flow of fluid through the pump, the pump being adapted to be connected through a closed loop to a motor. A pressure compensating valve is provided in the housing for governing pressure output of the pump, and a pump control cylinder is provided for positioning a flow control cam of the pump in accordance with flow of fluid through the direction control valve and the pressure compensating valve. A cam plate is coaxially connected to a directional control rotatable valve spool of the direction control valve, the cam plate having an outer periphery that is continuously radially variable from a maximum radial point to a minimum radial point for either direction of rotation of the cam from the maximum radial point as the control spool is rotated in either direction from a normal position. The cam plate actuates a cam follower, which in turn actuates a slideable sleeve in the pressure compensating valve. A valve sleeve on the directional control valve is fixed against rotation. There is no feedback connection to the cam plate of the pump to either the direction control valve or th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.