Brakes – Internal-resistance motion retarder – With means compensating for change in temperature or viscosity
Patent
1997-03-06
1999-05-11
Young, Lee W.
Brakes
Internal-resistance motion retarder
With means compensating for change in temperature or viscosity
188294, F16F9/52
Patent
active
059018216
ABSTRACT:
A rotary damper for stabilizing a temperature characteristic while allowing a leakage of operating oil from a clearance between a basic portion of a rotor and a bearing end on the casing side for supporting said rotor with relative rotational motion between the casing and the rotor. Two sets of operating oil chambers (17a, 17b) and (18a, 18b) which alternately expand and contract with rotational displacement of (9) are connected by an interconnecting flowpassage (54) provided on the housing (2). A damping force generating mechanism (44) includes two sets of damping elements (43a, 43b) arranged midway on the interconnecting flowpassage (54). A flow resistance of operating oil passing through the interconnecting flowpassage (54) is imparted by the damping force generating mechanism (44) and the damping force regulating mechanisms (72, 73) to generate a predetermined damping force corresponding to the operating direction of the rotary damper. An independent bypass flowpassage (31) connects the operating oil chambers (17a, 17b) and oil chambers (18a, 18b) and is provided in parallel with the flowpassage (54). A throttle mechanism (21) regulates a throttle degree with the change in temperature and is disposed on the bypass flowpassage (31). A change in leakage amount from a clearance between bearings (11a, 11b) on the casing and the rotor (9) with the change in temperature is offset by a control flow of operating oil leaking through the variable throttle mechanism (21) to minimize oil leakage amount irrespective of temperature 249.
REFERENCES:
patent: 1852755 (1932-04-01), Peo
patent: 2004904 (1935-06-01), Peo et al.
patent: 2004960 (1935-06-01), Peo
patent: 2301318 (1942-11-01), Peo
Kayaba Kogyo Kabushiki Kaisha
Young Lee W.
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