Transmission control system for shuttle type vehicles
US4090414A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1977 |
| Grant date | May 23, 1978 |
| Priority date | — |
| Expiry date | Apr 12, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19251
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A power transmission control system for vehicles where it is desired to reverse the vehicle direction at full throttle such as vehicles used in mining operations, off road application, or the like. The transmission includes selectively and hydraulically operated friction-type clutches and hydraulic control circuits for actuation thereof. The hydraulically operated output clutches are used to change speed range of the transmission while input clutches are used to change speed and/or direction of the vehicle. The control mechanism permits the vehicle in motion to be shifted to a reverse direction at full throttle and the arrangement is such that when the shift is made, the output speed range clutch disengages or optionally drops to residual torque capacity, the forward clutch remains fully engaged, and the reverse clutch comes on fully to brake the input. Then both forward and reverse clutches are engaged. The input is then locked. The output speed range clutch is then brought to increased "brake mode" torque capacity. The output speed range clutch then functions as a brake to decelerate the vehicle. The static braking reaction torque is held by the locked up direction clutches. When…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.