Electrohydraulic translation apparatus, in particular permitting control of a pressure in an automatic transmission
US4369804A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1980 |
| Grant date | Jan 25, 1983 |
| Priority date | — |
| Expiry date | Sep 15, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86421
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electromagnetic coil 29 exerts an attractive force on a movable plate 30 of magnetic material, within which is mounted a ball 32 of non-magnetic material blocking the end of a passage 33 for the hydraulic fluid. The apparatus also comprises electronic means for supplying the coil 29 by means of a pulsed unidirectional current, the mark/space ratio and mean value of which are subject to control by an operating magnitude represented by an electric control signal. The apparatus can be utilized as a hydraulic potentiometer for the determination of a control pressure proportional to an electric control signal in a hydraulic control circuit of an automatic transmission of industrial vehicles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.