Method of and apparatus for transmitting torque in the power trains of motor vehicles
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United States of America Patent
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Oct 7, 1997
Grant Date -
N/A
app pub date -
Oct 17, 1994
filing date -
Aug 21, 1992
priority date (Note) -
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Abstract
A method of operating a torque transmitting system with a hydrodynamic power transmission and with a friction clutch, which constitutes a lock-up clutch and bridges the power transmission, involves controlling the lock-up clutch and the hydrodynamic power transmission so that clutch slip is present. The input torque furnished by a prime mover is divided into a torque which is to be transmitted by the power transmission and a torque which is to be transmitted by the lock-up clutch. The lock-up clutch includes an annular piston which is disposed between the cover and the turbine wheel of the power transmission. The radially outer portion of the piston constitutes a clutch disc and its radially inner portion is mounted on a complementary sealing hub. The power transmission is 'soft' and exhibits a flat progress of the primary characteristic curve as well as a wide secondary characteristic curve, i.e., a wide torque conversion range.
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