Spring devices – Vehicle – Comprising compressible fluid
Patent
1977-11-17
1979-01-02
Halvosa, George E. A.
Spring devices
Vehicle
Comprising compressible fluid
137539, 188269, 188298, 188314, F16F 908
Patent
active
041323955
ABSTRACT:
A shock absorber, particularly adapted for use in the rear suspension of a motorcycle, comprises a tubular housing having a piston reciprocally mounted therein. A first chamber is defined between the housing and the head end of the piston whereas a second chamber is defined between the rod end of the piston and the housing. An inflatable bladder is disposed in a hollow rod of the piston and defines the third chamber with the rod which is in open communication with the first chamber. The chambers are at least partially filled with oil and the first chamber and bladder are air-pressurized to selectively set the spring rates of the shock absorber. A plurality of circumferentially disposed ports are formed through a head of the piston and are normally closed by a spring washer to prevent communication of oil from the first chamber to the second chamber upon extension of the shock absorber and for permitting such communication upon compression thereof. An orifice is also formed through the head of the piston to meter oil from the second chamber to the first chamber upon extension of the shock absorber. A check valve is also mounted in the head to cooperate with the orifice to also meter fluid from the second chamber to the first chamber upon extension of the shock absorber and when the differential pressure of the oil between the first and second chambers exceeds a predetermined level.
REFERENCES:
patent: 2467098 (1949-04-01), Rossman
patent: 3003594 (1961-10-01), De Carbon
patent: 3302662 (1967-02-01), Webb
patent: 3410549 (1968-11-01), Cheak
patent: 3469661 (1969-09-01), Hoffmann et al.
patent: 3625321 (1971-12-01), Lutz
patent: 3706362 (1972-12-01), Faure
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