Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1990-08-17
1992-02-25
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
280707, F16F 918, B60G 1126
Patent
active
050905252
ABSTRACT:
A shock absorber has an arrangement for bringing about different kinds of damping characteristics, in response to external controls (I) and independently of how the piston speed varies. The shock absorber comprises a piston which works in a cylinder (2) and which has a passage between upper and lower sides (1a, 1b) of the piston. The changes in the damping characteristics are obtained by a restriction in a channel through which a shock absorber medium or fluid flows. A first valve element (7) exerts an influence on the restriction in response to a first pressure which is created by means of a pilot flow running between the upper and lower sides at the piston. The pilot flow is determined by a second valve element (8) which is controllable by electrical control signal. The first valve element (7) comprises a spring-loaded, pressure-operated slide, the position of which is at every instant counterbalanced by the first pressure and a second pressure originating from the pressure differential existing between the upper and lower sides of the piston. The second valve element interacts with a proportional magnet which provides a setting of the first pressure that is independent of the variation in the piston speed.
REFERENCES:
patent: 3858841 (1975-01-01), Haynes
patent: 4732408 (1988-03-01), Ohlin
patent: 4796662 (1989-01-01), Hoffmann et al.
patent: 4801155 (1989-01-01), Fukushima et al.
patent: 4938499 (1990-07-01), Kawabata
Oberleitner Robert J.
Ohlins Racing AB
Poon Peter M.
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