Servo mechanism, especially for intensifying the braking power in a motor vehicle

  • US 4,531,419 A
  • Filed: 08/21/1981
  • Issued: 07/30/1985
  • Est. Priority Date: 08/22/1980
  • Status: Expired due to Term
First Claim
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1. Servo-mechanism apparatus for use between brake means and brake activating means for providing power assisted braking of a vehicle, comprising:

  • a housing;

    a motor driven accessory drive means having a rotary output;

    a push rod supported in said housing and comprising an input rod coupleable to said brake activating means and being axially displaceable by said brake activating means along the longitudinal axis of said push rod, and an output rod coupleable to said brake means and being axially displaceable along said axis, said input rod and said output rod being in substantially coaxial alignment;

    said drive means comprising a driven wheel formed as a hollow cylinder in coaxial alignment with said push rod and being driven by said rotary output to rotate about said longitudinal axis, said output rod extending into said cylinder;

    a servo member supported in said housing coaxial to said push rod for transferring force from said driven wheel to said output rod, said servo member comprising a displaceable pressure sensitive means arranged between said input rod and said output rod for determining the force said servo member exerts on said push rod in response to force exerted on said input rod by said brake activating means, said pressure sensitive means comprising a first element coupled to said input rod and a second element coupled to said output rod, said servo member further comprising a first movable joint coupling said driven wheel to one of said first or second elements and a second movable joint coupling the other of said first or second elements to said housing;

    one of said first or second movable joints comprising a screw joint permitting screw like motion about said axis between the parts connected therewith;

    the other of said first or second joints comprising a push joint permitting only relative axial motion along said axis between the parts connected therewith.

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