Planetary gear transmission systems or components – Electric or magnetic drive or control – Differential drive or control
Patent
1999-11-03
2000-12-26
Wright, Dirk
Planetary gear transmission systems or components
Electric or magnetic drive or control
Differential drive or control
475153, 192 842, F16H 4822
Patent
active
061650951
ABSTRACT:
An apparatus and method for demagnetizing a differential which has a controllable electromagnetically actuated clutch. The apparatus includes sensors and a coil connected to a control module. The sensors receive vehicle inputs to indicate various measured values such as vehicle speed, brake pressure, magnetization current provided to the differential, and the like and generates signals which are transmitted to the control module. The control module initiates a demagnetization cycle when certain conditions have been satisfied as indicated by the input signals. The control module provides a DC voltage to the coil to generate magnetic flux for demagnetizing the differential and the components of the differential. In one embodiment a single coil is provided to which is applied both magnetization and demagnetization current. In another embodiment two coils are provided, one for generating magnetization flux and the other for generating demagnetization flux. The control alternatively applies voltages of reverse polarity in decreasing amplitudes for predetermined periods of time during a demagnetization cycle.
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Leeper Robert
Till Thomas N.
Auburn Gear, Inc.
Wright Dirk
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