Viscous coupling by-pass element having variable drive capabilit

Details Viscous coupling by-pass element having variable drive capabilit Viscous coupling by-pass element having variable drive capabilit

1993-06-23

1995-07-18

Pitts, Andrea L.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 329, 192 333, 192 58B, F16H 4502, F16D 3500, F16D 4706

Patent

active

054333040

ABSTRACT:
A viscous coupling (29) is disclosed for use as a by-pass element in a torque converter (15). The viscous coupling (29) includes a body member (31) and a cover member (33), with an annular clutch member (35) being disposed in a viscous shear area defined by the body and the cover. When the coupling is filled with viscous fluid, it has a nominal drive factor. The body member (31) defines a fill-hole (63) and an evacuation (discharge) passage (65). A pump element (71) is disposed adjacent the evacuation passage. A valve member (79) moves in response to changes in fluid pressure in an apply chamber (A), and in a low-gain mode, permits flow through the evacuation passage (65) filling the shear space radially outward of the pump element (71). In a high-gain mode, the valve member (79) blocks flow through the evacuation passage (65), and the entire shear area is filled.

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