Fluid coupling device having improved temperature responsiveness

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

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192 82T, 192113A, F16D 3502

Patent

active

049498258

ABSTRACT:
A rotary fluid coupling device is provided of the type including a first rotatable coupling assembly (13) comprising a housing member (15) and a die cast cover member (17). An input coupling member (11) is disposed in a fluid operating chamber (33) and cooperates with an adjacent surface of the cover member (17) to define a viscous shear space therebetween. When the shear space is filled with viscous fluid, torque can be transmitted from the input coupling to the output coupling, such torque transmission resulting in the generation of a substantial amount of heat adjacent the front surface of the cover member. The cover member (17) includes a generally annular portion (36) defining therein a reservoir chamber (35). Disposed within a recessed area defined by the annular portion (36) is a bimetal coil (45) which defines a coil circle C. The annular portion (36) of the cover includes a plurality of blower fin members extending radially inward to a location adjacent the coil circle C, each having an axial height H1 which is a major portion of an axial distance X from the forward surface of the cover member to the bimetal coil. The blower fins (71) generate a radially outward flow of air, thus resulting in an axial flow of air through the bimetal coil, to improve the temperature responsiveness of the coupling device.

REFERENCES:
patent: 2986250 (1961-05-01), Becker
patent: 3584716 (1971-06-01), Coty
patent: 3993415 (1976-11-01), Hauser
patent: 4134484 (1979-01-01), Lansinger
patent: 4181205 (1980-01-01), Mennucci et al.
patent: 4678070 (1987-07-01), Light

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