High efficiency hydraulic transmission control system
US8413777B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2010 |
| Grant date | Apr 9, 2013 |
| Priority date | — |
| Expiry date | Sep 2, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19251
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Pairs of variable feed solenoid valves provide fluid to a pair of input clutch actuators and a pair of inlet ports of a first logic valve. The position of the first logic valve spool is controlled by a solenoid valve. A first pair of outlet ports of the first logic valve provide hydraulic to a first piston which selects two speed ratio. A second pair of outlet ports of the first logic valve provide fluid to a pair of inlet ports of a second logic valve. The position of the second logic valve spool is controlled by fluid from the input clutch circuits. A first pair of outlet ports of the second logic valve provide fluid to a second piston which selects two other speed ratios and a second pair of outlet ports of the second logic valve provide fluid to a third piston which selects two additional speed ratios.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.