Hydraulic regulating device for load operated gear shift systems
US4420994A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1980 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Oct 23, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0258
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The hydraulic regulating device for an automatic transmission having a selector valve for selecting a plurality of gear stages, includes a high pressure conduit, a working pressure conduit and a shift pressure conduit, a plurality of coupling elements assigned to respective gears, a single, pressure regulating valve electromagnetically controlled by a control signal to build up or decrease pressure in the shift pressure conduit, holding valves connected between the working pressure conduit and the shift pressure conduit, and shift control valves connected to the shift pressure conduit and cooperating with the holding valves to connect, in response to an increased gear, the coupling elements pertaining to the higher gear in a preselected gear stage, to the shift pressure conduit and, upon completion of the gear shift operation, to connect via the working pressure conduit the coupling elements to the high pressure conduit with the exception of the last actuated coupling element who remains connected to the shift pressure conduit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.