The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 1999
Filed:
Mar. 06, 1997
Nobumichi Hanawa, Gifu-ken, JP;
Kayaba Kogyo Kabushiki Kaisha, Tokyo, JP;
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.