Hydraulic pumping arrangements
US4123202A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1976 |
| Grant date | Oct 31, 1978 |
| Priority date | — |
| Expiry date | Nov 3, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulic pumping arrangement for pumping a liquid to a hydraulic system, which comprises pumping means for pumping the liquid, swash means including a variable swash member which enables the liquid output of the pumping means to be infinitely varied between minimum and maximum, a first piston-and-cylinder arrangement for increasing the position of the swash member to increase the liquid output of the pumping means, a second piston-and-cylinder arrangement for decreasing the position of the swash member to decrease the liquid output of the pumping means, control means for controlling the flow of liquid for the second piston-and-cylinder arrangement, switching means operative to pass liquid from the system to the control means at a first condition in the system and operative to stop liquid from the system passing to the control means at a second condition in the system, and valve means for isolating the pumping arrangement from the system and from a main pump normally supplying liquid to the system, the control means being operative when it is receiving liquid from the switching means to enable the swash member to be moved to an on-swash condition and therefore the pumping means t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.