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Low level damping valve and method for a semi-active hydraulic damper

  • US 5,163,538 A
  • Filed: 09/03/1991
  • Issued: 11/17/1992
  • Est. Priority Date: 09/03/1991
  • Status: Expired due to Term
First Claim
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1. A hydraulic damper for vehicular suspension comprising:

  • (a) a fluid-filled inner cylinder;

    (b) a piston slidably mounted in the inner cylinder and dividing the inner cylinder into upper and lower chambers;

    (c) piston valving means for controlling fluid flow through the piston;

    (d) a reservoir tube concentrically mounting the inner cylinder and cooperating therewith to form a fluid reservoir;

    (e) compression valve means for controlling fluid flow between the lower chamber and the reservoir;

    (f) a bypass channel formed between the inner cylinder and the reservoir for receiving fluid from the upper chamber;

    (g) a seal cup having an inlet in fluid communication with the bypass channel, the seal cup being slidably received in a valve boss mounted on an exterior surface of the reservoir tube;

    (h) blow-off valve means inserted into the seal cup, the blow-off valve means having an axially-displaceable valve element normally biased closed by spring means to provide low level damping when the blow-off valve means is opened by fluid pressure; and

    (i) solenoid valve means, housed separately from the blow-off valve means, secured to the valve boss downstream of the blow-off means, the solenoid valve means having an inlet portion for receiving fluid from the opened blow-off valve means and an outlet portion directing fluid to the reservoir when the solenoid valve means is energized.

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