Ohlins Racing Ab

Håkan Malmborg

Fredrik Larsson

Benny Ewers

Björn Stjärne

Lars SÖNSTERÖD

A valve arrangement and a method for controlling a pilot pressure in the valve arrangement for a shock absorber, wherein the valve arrangement comprises a control valve member movable in an axial direction relative a main valve member, a pilot chamber being in fluid communication with a first port and/or a second port. The arrangement and method comprise, during an active control mode, pressure relieving (AM S) the control valve member and applying an actuating force (AM S) for controlling the pilot pressure (Pp). Further, during a failsafe control mode, controlling (FM S) the control valve member by means of the pilot pressure (P). And finally, during both the active control mode and the failsafe control mode restricting (S) the pilot fluid flow (PF, PF) by at least one common valve seat (R).

Valve arrangement and method for controlling a pilot pressure in a valve arrangement

Valve arrangement for a shock absorber is described, comprising a valve housing () having a first () and a second port (), a pilot chamber () being in fluid communication with the first () and/or second port (), wherein a pilot pressure (Pp) is defined by a hydraulic pressure in the pilot chamber (). The arrangement further comprises a main valve member () being axially movably arranged in the valve housing () and being arranged to interact with a main valve seat member () in order to restrict a main fluid flow between the first () and second ports () in response to the pilot pressure (Pp) acting on the main valve member (). Moreover, the main valve seat member () is movable between a first compression stroke position and a second rebound stroke position so that, during the compression stroke, the main fluid flow is restricted at a first restriction (R) and a cooperating serially arranged second restriction (R), and during the rebound stroke, the main fluid flow is restricted at a third restriction (R).

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Norrahammar, Sweden

Håkan Malmborg