Pulse control of an electro magnetically actuated viscous fluid

192 clutches and power-stop control – Clutches – Fluent material

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123 4112, 192 82T, 192 84R, 236 35, 251129, F16D 3500, F16D 4325

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active

042288800

ABSTRACT:
A viscous fluid coupling employing an electro magnet which receives electrical pulses in response to a signal received from a heat sensing device to operate a valve arm to seal and unseal an inlet passage fluidly communicating an operating chamber with a storage chamber. The operating chamber is defined by a clutch member and a housing member that are rotatably disposed relative to one another. The storage chamber is defined by the housing and is in fluid communication with the operating chamber via a discharge passage and the inlet passage. A pump displaces fluid from the operating chamber through the discharge passage into the storage chamber. The inlet passage directs fluid when unsealed from the storage chamber to the operating chamber. The valve arm is moved in one direction in response to inducing a magnetic field and in the other direction by a spring when the magnetic field is not induced. Fluid is disposed within the coupling and, when located in the operating chamber, transmits torque from the clutch to the housing. The magnetic field is induced and terminated by an electrical control at a controlled pulse rate dependent upon a signal from the heat sensing device to control the amount of fluid entering the operating chamber and thus control the speed of the housing.

REFERENCES:
patent: 3055473 (1962-09-01), Oldberg et al.
patent: 3094132 (1963-06-01), Byloff
patent: 3250355 (1966-05-01), Weir
patent: 3470892 (1969-10-01), Barker
patent: 3659631 (1972-05-01), Rakoske
patent: 3874407 (1975-04-01), Griswold
patent: 4056178 (1977-11-01), Detty
patent: 4103695 (1978-08-01), Aono

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