Assisted hydraulic control
US3971214A · kind A · utility
Inventor
Key dates
| Filing date | Mar 19, 1975 |
| Grant date | Jul 27, 1976 |
| Priority date | — |
| Expiry date | Mar 19, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/087
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The invention relates to an assisted hydraulic control, especially for steering all types of vehicles, and comprising a double-acting receiver or hydraulic cylinder, the piston of which forms two chambers in the cylinder, the piston rod extending into one of the chambers only and having no counter-rod extending into the other chamber. The first chamber thus has a smaller effective section than the second chamber, and the resulting asymmetry of operation of the piston and therefore of the steering is compensated by an arrangement in which the distributor valve means of the control, which couples a return conduit to the second of two actuating conduits in a first working position, isolates the return conduit and connects together the second of two pilot conduits, the second actuating conduit and the first actuating conduit in the second working position. The conditions of actuation are thus rendered exactly symmetrical for both directions of working when the section of the first chamber is equal to one-half the section of the second chamber. The distributor valve is controlled in dependence on the direction of working of the pilot pump by mechanical, hydraulic or electrical control m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.