Method and apparatus for controlling hydraulic vehicle transmission
US4684004A · kind A · utility
3Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1986 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | Feb 27, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2500/7041
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The transmission control for a vehicle hydraulic transmission includes a sequence control valve that includes a shuttle valve and an interconnected sequence valve which are connected with speed and direction clutches of the transmission. The shuttle valve senses the drop in pressure in the direction clutches when they are shifted to actuate the sequence control valve to initially dump the speed clutch and then to keep that clutch disengaged until the direction clutch has fully re-engaged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.