Rotary viscous damper

Details Rotary viscous damper Rotary viscous damper

1993-03-12

1995-03-28

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

188293, 188310, F16D 3502

Patent

active

054008786

ABSTRACT:
One preferred embodiment of a rotary viscous damper that provides damping force constancy over the operating temperature range of a viscous working fluid includes a damper housing defining a stationary conical damping surface, a shaft member rotatably mounted in the damper housing, a rotor member having a rotating conical damping surface, a temperature compensation mechanism, and a bias spring. The stationary and rotating conical damping surfaces in opposed combination define the shear gap of the damper. The rotor member is mounted in combination with the shaft member, and is axially displaceable with respect thereto. The bias spring provides a constant spring force acting on the rotor member to axially position the rotor member to establish the baseline shear gap of the damper. The temperature compensation mechanism is mounted in compressive engagement with the rotor member and exerts a temperature-dependent biasing force thereagainst in opposition to the constant spring force. The temperature compensation mechanism includes a plurality of expansion elements mounted in combination with support sleeves. The expansion elements are formed from material having a high coefficient of thermal expansion and are operative, in response to temperature changes in the working fluid, to provide the temperature-dependent biasing force which causes axial displacement of the rotor member with respect to the shaft member. Axial displacement of the rotor member causes corresponding changes in the dimension of the shear gap to compensate for temperature-induced variations in the viscosity of the viscous working fluid to provide damping force constancy.

REFERENCES:
patent: 2699846 (1955-01-01), Pitman et al.
patent: 3070192 (1962-12-01), Barkalow
patent: 3119469 (1964-01-01), Farr et al.
patent: 3228494 (1966-01-01), Rumsey
patent: 3861503 (1975-01-01), Nash
patent: 5116201 (1992-05-01), Fradenburgh et al.

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