Brakes – Internal-resistance motion retarder – Controlled by an operator remote from retarder
Patent
1989-10-20
1992-07-14
Michalsky, Gerald A.
Brakes
Internal-resistance motion retarder
Controlled by an operator remote from retarder
60545, 60592, 188319, 251 57, 25112906, F15B 1500, F16K 3102
Patent
active
051294893
ABSTRACT:
A variable-damping-force shock absorber includes a piezoelectric actuator for producing a displacement, a hydraulic pressure chamber filled with a working oil and having a volume variable in response to the displacement produced by said piezoelectric actuator, and a plunger slidably disposed in a sleeve and reciprocally movable in response to a change in the volume of said hydraulic pressure chamber. The sleeve and said plunger define therebetween a gap communicating with said hydraulic pressure chamber. A supply passage for supplying a working oil from an external working oil source into said hydraulic pressure chamber extends through the gap. A leakage of the working oil from the hydraulic pressure chamber through the gap can automatically be compensated for by working oil supplied through the supply passage. Since the working oil leaks from and is supplied into the hydraulic pressure chamber through the gap, the leakage and supply of the working oil are kept in equilibrium.
REFERENCES:
patent: 3648967 (1972-03-01), O'Neill et al.
patent: 3920217 (1975-11-01), Olsen
patent: 4729459 (1988-03-01), Inagaki et al.
patent: 4762300 (1988-08-01), Inagaki et al.
Hagiwara Yasumasa
Ishida Toshinobu
Kamiya Sigeru
Kuroyanagi Masatoshi
Majima Youzou
Michalsky Gerald A.
Nippondenso Co., Ltd., 1-1
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