Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1986-07-11
1988-02-16
Wright, Dirk
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74752A, 74867, B60K 4116, B60K 4118, F16H 374
Patent
active
047247266
ABSTRACT:
A transmission for a vehicle which is frequently reversed comprises a torque convertor driven by an internal combustion engine, and planetary change speed gearing having an input driven by the torque convertor and an output connected to driving wheels of the vehicle. The individual speed ratios in both forward and reverse directions of drive are selectively engaged by engagement of associated friction elements to provide a plurality of forward speed ratios and at least one reverse speed ratio. In response to movement of a control element from a first position corresponding to the prevailing direction of drive to a second position corresponding to the opposite direction of drive, a control device causes release of the friction element determining the ratio engaged in the prevailing direction of drive, engagement of the friction element associated with a high speed ratio in the opposite direction of drive and initiation of engagement of the friction element associated with a lower speed ratio in the opposite direction of drive, followed by release of the friction element associated with the high ratio in the opposite direction after a period of retardation of the vehicle but preferably before its speed has been reduced to zero in the prevailing direction.
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