Hydraulic control unit for automotive transmissions
US4625840A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 13, 1984 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | Aug 13, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/307
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic control unit for an automotive transmission has a change gear operating mechanism and a clutch operating mechanism. All component parts of the control unit are incorporated into one body. These include a first hydraulic actuator for gear shifting and gear selection of the speed change gear, solenoid valves for controlling the first hydraulic actuator, position sensors for sensing positions of the first hydraulic actuator indicative of the selected gear position and shifted gear position of the speed change gear, a second hydraulic actuator for engagement and disengagement of the clutch, solenoid valves for controlling the second hydraulic actuator, and a position sensor for sensing the position of the second hydraulic actuator indicative of engagement and disengagement of the clutch. An air breather provided on the control unit housing on the side of the speed change gear communicates with an air chamber of the second hydraulic actuator through a passage formed within the control unit housing, to also serve as an air breather for the same chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.