Variable displacement pump with adjustment responsive to drive motor speed
US5438832A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1993 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Aug 31, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/6054
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A control device for an actuator adapted to control a discharge pressure of a variable discharge pump by means of a regulator and capable of ensuring sufficient flow control range of change-over valves with respect to a spool stroke even when the number of rotations of an engine for driving the variable discharge pump is reduced to decrease a discharge rate of fluid from the variable discharge pump. Elastic force of a spring of a valve constituting the regulator is adjusted by means of a cylinder associated with a throttle lever for controlling the engine. Also, a control valve is arranged so as to be associated with the throttle lever, so that a pressure on a downstream side of the variable discharge pump is increased to change over the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.