Machine element or mechanism – Gearing – Interchangeably locked
Patent
1996-02-07
1997-10-28
Ta, Khoi Q.
Machine element or mechanism
Gearing
Interchangeably locked
74336R, 74664, F16H 5900, F16H 6100, F16H 3706
Patent
active
056807945
ABSTRACT:
A method is provided for operating a hydraulic control system for a transmission having first and second torque transmission paths arranged in parallel with one another between a common input shaft and a common output shaft, first and second hydraulically controlled clutches arranged in the first and second torque transmission paths, respectively, and a hydraulically controlled gear synchronizer in the second torque transmission path for selectively coupling a shaft for rotation with a gear wheel to effect a change in the transmission ratio through the second torque path while the second clutch is disengaged. To prevent wear on the synchronizer and the gear, prior to activating the hydraulic control for moving the synchronizer into engagement with the gear wheel, the hydraulic control system is operative first to move the synchronizer into a neutral position in which torque cannot be transmitted through the first torque transmission path. The second clutch is then engaged for a predetermined time interval while the synchronizer is in the neutral position to match the speed of the synchronizer to that of the gear wheel 18 with which it is to be brought into engagement.
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Miller Larry W.
New Holland North America Inc.
Seemar Frank A.
Stader John W.
Ta Khoi Q.
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