Ohlins Racing Ab

Yamaha Hatsudoki Kabushiki Kaisha

Kenth Ohlin

Magnus Danek

Tommy Malm

A number of embodiments of hydraulic shock absorbers, including a damping arrangement that includes a cavity and an elastomeric member received in the cavity which cooperates with the fluid chamber so as to permit small degrees of relatively undamped fluid flow to improve road holding.

Shock absorber arrangement and use

A shock absorber has an arrangement for bringing about different kinds of damping characteristics, in response to external controls 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 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 instantaneous position of which is 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.

Absorber arrangement

A shock-absorber includes a cylinder and a piston arranged within the cylinder and provided with at least one passageway of variable area for controlling flow of a working fluid from one side of the piston to the other side thereof. A controllable device is incorporated within the piston and continuously controlled by external control signals from a control unit to vary the area of the passageway. The external control signals are supplied by the control unit in response to input signals received from sensors which are associated with the shock-absorber. The input signals are related to the instantaneous parameter information obtained from the piston. The value of the external control signals varies during the stroke of the piston at least in part as a function of the input signals.

Means for a shock absorber

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.

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Sollentuna, Sweden

Kenth Ohlin