Machine element or mechanism – Gearing – Interchangeably locked
Patent
1997-07-28
1999-04-06
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
74339, B60K 4122, F16H 6104
Patent
active
058903925
ABSTRACT:
A twin-clutch transmission has first and second transmission input shafts and a transmission output shaft, each input shaft having an associated friction clutch. In the initial state, the first clutch transmits engine torque in a state of static friction and the second clutch is open. In a shifting operation the second transmission input shaft is brought to a synchronous speed, thus permitting the engagement of a selected gear. In order to prevent a condition in which both clutches are in static friction engagement, which would result in locking up of the transmission, the speed of at least one clutch is maintained in the range of sliding friction to a value in the vicinity of the synchronization speed until the torque to be transmitted has been transferred steadily from the first clutch to the second clutch. A synchronizer is used when shifting up in the overrun condition.
REFERENCES:
patent: 4463621 (1984-08-01), Fisher
patent: 4527678 (1985-07-01), Pierce et al.
patent: 5259260 (1993-11-01), Schneider
patent: 5603242 (1997-02-01), Krieger
patent: 5711409 (1998-01-01), Murata
European Patent Office Search Report, Appln. No. 97111397, dated Jul. 23, 1998.
Cappelmann Bernd
Haack Reinhold
Ludanek Harald
Volkswagen AG
Wright Dirk
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