Viscous shear couplings

Details Viscous shear couplings Viscous shear couplings

1975-10-22

1977-08-09

Scott, Samuel

192 clutches and power-stop control

Elements

Wear compensators

74711, 192 58B, 192 82T, F16D 380, F16H 144, F16D 1900, F16D 3100

Patent

active

040402711

ABSTRACT:
Viscous shear couplings for controlling the action of an interaxle or interwheel differential gear in a vehicle transmission are described. The couplings comprise a pack of interleaved annular plates which are free to float axially in an annular enclosure containing a viscous liquid. The enclosure incorporates a spring-loaded piston shiftable to vary the enclosure volume. The quantity of viscous liquid, in the range 85% to 100% of the minimum volume at ambient temperature, and the spring strength are chosen to give a predetermined pressure build-up within the enclosure with rise in temperature during shearing of the viscous liquid to tailor the torque-transmitting characteristics of the coupling to particular needs.

REFERENCES:
patent: 3071225 (1963-01-01), Blau et al.
patent: 3236346 (1966-02-01), Roper
patent: 3385408 (1968-05-01), Manning
patent: 3760922 (1973-09-01), Rolt et al.

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