Shift control system for a multiple input transmission
US4068537A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1976 |
| Grant date | Jan 17, 1978 |
| Priority date | — |
| Expiry date | Oct 12, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/20085
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In combination with a transmission having a multiple input portion and a multiple output portion, each of which contains a plurality of speed change gears, is a shift control system having a plurality of fluid-pressure operated actuators that respond to movement of a preselector valve control member having a plurality of positions that correspond to separate ones of the drive ratios. Shift sensing means produce a first signal upon movement of the preselector valve control member whereas neutral position sensing means produce a second signal upon movement to neutral of the transmission input portion. A neutral sequence valve has a movable spool member maintainable in first and second alternate positions in response to the first and second signals, with mechanical interlock means, associated with the actuators, locking the transmission output portion in gear whenever the transmission input portion is in gear and locking the input portion in neutral whenever the output portion is in neutural. Details of the mechanical interlock means as well as shifting and interlocking methods are also set forth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.