Machine element or mechanism – Gearing – With fluid drive
Patent
1977-04-12
1978-05-23
Scott, Samuel
Machine element or mechanism
Gearing
With fluid drive
74335, 192 8718, F16H 4700, F16H 560, F16D 2500
Patent
active
040904148
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 the vehicle speed reaches a predetermined lower value (where it is almost stopped) that situation is sensed by the hydraulic control means and immediately thereafter and simultaneously the forward clutch is released and apply pressure on the braking (output speed range) clutch is permitted to increase to full value. The vehicle then accelerates in the opposite direction under the influence of the torque converter. This control system also provides means for quick and smooth full throttle shifts at and near vehicle stopped condition; that is for either a neutral into range shift or a directional shift.
REFERENCES:
patent: 2933172 (1960-04-01), Fisher et al.
patent: 3151718 (1964-10-01), Temple
patent: 3239020 (1966-03-01), Morris et al.
patent: 3738193 (1973-06-01), Sumiyoshi et al.
Chandler Lance W.
Nilles James E.
Scott Samuel
Twin Disc Incorporated
LandOfFree
Transmission control system for shuttle type vehicles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transmission control system for shuttle type vehicles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmission control system for shuttle type vehicles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-558518