Brakes – Internal-resistance motion retarder – Motion damped from condition detected outside of retarder
Patent
1997-08-07
1999-10-05
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Motion damped from condition detected outside of retarder
1883222, F16F 946
Patent
active
059609150
ABSTRACT:
The present invention provides a hydraulic shock absorber in which a damping force can be changed nearly linearly as a valve body driven by a proportional solenoid is displaced, by utilizing ports and a oil groove which can easily be formed by a conventional machine tool such as a drilling machine or a lathe. Oil passages and an annular groove connected to the oil passages are formed in a surface of a cylindrical guide portion along which a plunger can slide, and, circular oil passages and an annular groove connected to and offset from the oil passages are formed in a surface of a plunger. The oil passages and annular groove in the plunger can easily be formed by a conventional machine tool such as a drilling machine or a lathe. When an oil path is opened, the oil passages are firstly opened and then the associated annular groove is opened. Thus, a damping force can be changed nearly linearly, and response to the switching of the damping force can be improved.
REFERENCES:
patent: 5439085 (1995-08-01), Woessner
patent: 5518089 (1996-05-01), Handka et al.
patent: 5651433 (1997-07-01), Wirth et al
patent: 5655633 (1997-08-01), Nakadata et al.
Kashiwagi Akira
Nezu Takashi
Butler Douglas C.
Tokico Ltd.
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