Electro-hydraulic control device for power shift gearboxes
US5996435A · kind A · utility
2Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 22, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | May 22, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1926
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electrohydraulic control device for power shift gearboxes, in particular in construction machinery, has switching elements (SE1, SE2, SE3) which can be actuated by a system pressure from an external pressurized medium source (1). Shift valves (SV1, SV2, SV3) are provided between the pressurized medium source (1) and the switching elements (SE1, SE2, SE3) and can each be actuated by pilot pressure. Each of the switching elements (SE1, SE2, SE3) can be actuated in a defined switching state by at least two actuated shift valves (SV1, SV2, SV3) and at least one non-actuated shift valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.