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Device for preventing vehicle wheels from locking

  • US 4,505,520 A
  • Filed: 02/02/1983
  • Issued: 03/19/1985
  • Est. Priority Date: 02/12/1982
  • Status: Expired due to Term
First Claim
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1. A wheel-lock preventing device comprising:

  • an input fluid chamber communicating with a master cylinder;

    an output fluid chamber communicating with rear wheel brake devices;

    a differential piston disposed to separate the input and output fluid chambers from each other, said differential piston being arranged to move toward the output fluid chamber to a predetermined extent against the spring force of a return spring when the actions of fluid pressure from the two fluid chambers exceed a prescribed value, said return spring being arranged to return said differential piston to the original position thereof;

    a valve body member arranged to close fluid passage between said input and output fluid chambers by engaging the differential piston when the differential piston moves; and

    a driving device arranged to open said fluid passage by moving said valve body member.

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