Hydraulic control for automatic transmission wherein sequential clutch engagement is controlled by an accumulator
US4665774A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1985 |
| Grant date | May 19, 1987 |
| Priority date | — |
| Expiry date | Jun 18, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2023
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic control for an automatic transmission which comprises first and second friction coupling members, a first fluid passage for supplying an operating fluid for coupling the first friction coupling member, a second fluid passage for supplying an operating fluid for coupling the second friction coupling member, and an accumulator having a working chamber fluid-connected with the first fluid passage and comprising a piston and a spring for urging the piston in one direction. The piston is displaced against the spring, when the operating fluid is supplied into the working chamber, to regulate the pressure of the operating fluid for minimizing a shock resulting from the coupling of the first friction coupling members and also to open the second fluid pssage whereby the timing at which the second friction coupling member is coupled is delayed relative to the timing at which the first friction coupling member is coupled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.