Anti-skid control apparatus for a vehicle braking system
First Claim
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.
2 Assignments
0 Petitions
Accused Products
Abstract
An anti-skid control apparatus includes a master cylinder, a fluid pressure control valve for controlling fluid pressures of wheel cylinders connected to one of two brake conduit circuits, and a valve apparatus for controlling fluid pressure of wheel cylinders connected to the other of the two brake conduit circuits. The valve apparatus includes a casing having first and second input ports, an output port, a piston, a control chamber and a volume chamber formed at both sides of the piston. A valve part is disposed between the first input port and the volume chamber, the first input port being connected to one fluid pressure generating chamber of the master cylinder and the output port being connected to the wheel cylinders that are connected to the other of the two brake conduit circuits. A changeover valve is connected to the second input port. The changeover valve is set either in a first position for connecting another fluid pressure generating chamber of the master cylinder to the control chamber or else a second position for connecting the output side of the fluid pressure control valve with the control chamber. When the changeover valve is in the first position, the valve part is open, and when the changeover valve is in the second position and the fluid pressure control valve is operated, the piston is moved toward the control chamber to close the valve part so as to cut off the first input port from the volume chamber and change the volume of the volume chamber.
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Citations
10 Claims
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1. In an anti-skid control apparatus for a vehicle braking system comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification