Electromagnetic frictionally engaged clutch and method for operating the same
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United States of America Patent
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Sep 11, 2007
Grant Date -
Aug 11, 2005
app pub date -
May 27, 2003
filing date -
Jun 10, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
An electromagnetic frictionally engaged clutch for arranging inside a drive train connecting a drive motor and a vehicle door or flap. The arrangement ensures that the vehicle door is securely held in each intermediate position, when the clutch is in an idle state, while maintaining the possibility of a manual emergency actuation of the vehicle door. The rotor includes at least one permanent magnet in addition to the electric coil, such that when a current does not pass through the coil, the armature disk is pressed against the friction lining of the rotor, with a force which is strong enough for the vehicle door or vehicle flap to securely remain in position occupied when the clutch is an idle state, and for the friction engagement between the armature disk and the friction lining to be overcome when the vehicle door or vehicle flap is subsequently manually actuated.
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