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Anti-skid control apparatus for a vehicle braking system

  • US 4,854,649 A
  • Filed: 01/13/1988
  • Issued: 08/08/1989
  • Est. Priority Date: 01/14/1987
  • Status: Expired due to Term
First Claim
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1. In an anti-skid control apparatus for a vehicle braking system comprising:

  • (A) a fluid pressure generating source to which two brake conduit circuits are connected;

    (B) a fluid pressure valve whose output side is connected to a wheel cylinder that is connected to one of said two brake conduit circuits to control fluid pressure of the wheel cylinder;

    (C) a valve apparatus for controlling fluid pressures of a wheel cylinder connected to the other of said two brake conduit circuits, said valve apparatus comprising a casing having first and second input ports and an output port, a piston, a control chamber and a volume chamber formed at both sides of said piston, a valve part arranged between said first input port and said volume chamber, and a pre-loading means which always presses in a direction to open said valve part, said first input port being connected to one fluid pressure generating chamber of said fluid pressure generating source, said second input port being connected to said control chamber, and said output port being connected to said volume chamber and to said wheel cylinder connected to the other of said two brake conduit circuits;

    the improvements in which changeover valve means is connected to saidsecond input port of the casing of the valve apparatus, said changeover valve means taking a first position in which said control chamber connects with another fluid pressure generating chamber of said fluid pressure generating source and is cut off from said wheel cylinder connected to one of said two brake conduit circuits, and taking a second position in which said control chamber is connected to said wheel cylinder that is connected to one of said two brake conduit circuits and is cut off from another fluid pressure generating chamber of said fluid pressure generating source when a skid signal to release the brake or to maintain the braking force constant is generated from said wheel cylinder connected to the other of the two brake conduit circuits wherein, when said changeover valve means takes said first position, said valve part is open due to said pre-loading means, and when said changeover valve means takes said second position and said fluid pressure control valve is operated, said piston is moved toward said control chamber by the difference in pressure between said control chamber and said volume chamber to close said valve part to cut off said first input port from said volume chamber and change the volume of said volume chamber with the movement of said piston.

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