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Pilot-operated hydraulic shock absorber for a motor vehicle

  • US 5,318,157 A
  • Filed: 12/28/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 06/28/1990
  • Status: Expired due to Fees
First Claim
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1. A pilot-operated hydraulic shock absorber for a motor vehicle, comprising:

  • a working cylinder having a cylinder axis, a piston rod and a piston coaxially disposed in said working cylinder;

    saidpiston defining in said working cylinder first and second chambers filled with a damping fluid;

    an outer fluid reservoir communicatingly connected to said working cylinder, passage means for allowing said outer fluid reservoir to fluidically communicate with said first chamber;

    an end piece disposed at an end of said working cylinder and closing said first chamber opposite said piston;

    said passage means being disposed in said end piece and including a solenoid-operated rotary valve disposed concentrically around said piston rod, said rotary valve being comprised of;

    a stator fixedly mounted in said end piece;

    a rotor disposed in said end piece and being rotatable about said cylinder axis;

    said rotor including adjustment means for selectively throttling said passage means and adjusting a pressure drop in the fluid across said passage means;

    said adjustment means including projections integrally formed on said rotor for selectively closing and opening said passage means fluidically connecting said first chamber and said outer fluid reservoir;

    said rotor and said stator defining at least one air gap therebetween;

    means in the form of an electric coil for establishing a magnetic field in said end piece;

    means for rotatingly biasing said rotor in a given direction;

    said stator, said rotor, said at least one air gap, and said coil forming a part of an electro-magnetic circuit in which the magnetic field established by said electric coil causes selective rotation of said rotor in a direction opposite said given direction and against said biasing means for selectively throttling said passage means.

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