Torque transfer apparatus using magnetorheological fluids

Details Torque transfer apparatus using magnetorheological fluids Torque transfer apparatus using magnetorheological fluids

1996-07-18

1998-07-14

Ta, Khoi Q.

192 clutches and power-stop control

Field responsive frictional media type

477179, F16D 2800

Patent

active

057790132

ABSTRACT:
A fluid-based torque transfer device modulates the amount of torque which is transmitted from an input shaft to an output shaft. The torque transfer device includes a first plate connected to the input shaft. A second plate is connected to the output shaft and spaced from the first plate. A magnetorheological fluid is provided between the first and second plates. A magnetic circuit, including a coil wound around a core material defining a gap, applies a magnetic field to the magnetorheological fluid to variably control the rotation of the second plate in response to the rotation of the first plate. A controller adjusts the current to the coil to vary the magnetic field. Sensors detect at least one of the rotational speed and the torque of the input shaft, the output shaft, vehicle speed, steering direction, throttle position, gear position and brake position. The controller varies the current provided to the coil based thereon. Exemplary applications for the fluid-based torque transfer device include a fuse, a clutch between an engine and a transmission, and a transfer case for four wheel drive powertrains.

REFERENCES:
patent: 4896754 (1990-01-01), Calrson et al.
patent: 5094328 (1992-03-01), Palmer
patent: 5358084 (1994-10-01), Schramm
patent: 5400866 (1995-03-01), Wilson et al.
patent: 5469947 (1995-11-01), Anzai et al.
patent: 5598908 (1997-02-01), York et al.
patent: 5620071 (1997-04-01), Ishikawa et al.

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