Machine element or mechanism – Gearing – Interchangeably locked
Patent
1998-05-11
1999-08-31
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
192 90, 192 35, F16D 1354, F16D 2712
Patent
active
059439114
ABSTRACT:
A friction clutch assembly in an automotive vehicle transmission is located between an engine-driven input shaft and a torque input shaft for a multiple ratio transmission. A clutch spring normally applies a clutch engaging force to the clutch assembly, thus establishing a torque flow path between the input shaft and the multiple ratio gearing. An electromechanically actuated ball ramp mechanism applies a friction clutch release force to the friction clutch assembly, thereby interrupting the torque flow path between the transmission input shaft and the multiple ratio gearing. An electromagnetic clutch actuator for the ball ramp mechanism, when it is energized, actuates the ball ramp mechanism to disengage the friction clutch. One element of the ball ramp mechanism is grounded to a transmission housing when the electromagnetic actuator is energized. Precise slip control of the friction clutch is achieved by modulating the energizing current for the electromagnetic actuator, thereby providing improved start-up performance and improving shift quality as ratio changes occur in the manual transmission.
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Borg-Warner Automotive Inc.
Dziegielewski Greg
Wright Dirk
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