Clutch stroke control metering valve for an automatic transmission
US4446759A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1981 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Oct 2, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0466
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system for an automatic transmission having planetary gear elements that define several forward driving torque delivery paths that are established and disestablished upon engagement and release of friction clutches and brakes including a timing valve for controlling the timing of the ratio change from a high direct drive ratio to an intermediate underdrive ratio including a pair of friction clutches that are engageable to establish the high speed ratio torque delivery path and a reaction brake that is applied upon release of one of the friction clutches to establish an intermediate speed ratio torque delivery path, the timing valve being effective to delay application of the brake during the downshift interval thus effecting a smooth ratio transition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.