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Anti-lock control apparatus
| Details |
Inventors: Miyake, Katsuya; Hirobe, Yoshiaki;
Assignee: Akebomo Brake Industry Co. ()
Primary Examiner: Reger; Duane A.
Assistant Examiner:
Attorney, Agent or Firm:
An anti-lock control apparatus of this invention has modulators each of which is disposed at a point between said master cylinder and each set of front and rear brakes. Each modulator has a stepped piston in its cylinder. In the cylinder, are formed a front output fluid chamber and a rear output fluid chamber both of which follow the master cylinder. The front output fluid chamber is connected to the front brake, while the rear output fluid chamber is connected to the rear brake. The front output fluid chamber normally communicates with the rear output fluid chamber and, during anti-lock operation, the communication between the front output fluid chamber and the rear output fluid chamber is cut off by a cut-off valve portion. Thus, the fluid pressure of the rear brake can be maintained at the fluid pressure in the cut-off state. |
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DETAILED DESCRIPTION It is, therefore, an object of the present invention to provide an anti-lock control apparatus which solves the problem involved in the conventional apparatus and which reliably supplies sufficient braking force to the whole of a vehicle by substantially preventing any excessive decrease in the fluid pressure of front wheels.
To achieve the above object, in accordance with the present invention, there is provided an anti-lock control apparatus having the following technical feature.
More specifically, the apparatus of the present invention is provided with modulators which are respectively disposed at a point between a master cylinder and each set of front and rear brakes.
Each of the modulators has a cylinder in its interior, and a stepped piston is accommodated in the cylinder.
The stepped piston has a large diameter portion and a small diameter portion which extends forwardly from the large diameter portion.
In addition, in the cylinder, an input fluid chamber for receiving fluid pressure from the master cylinder is defined between the large diameter portion and the small diameter portion of the stepped piston.
If it is assumed that the small diameter portion of the stepped piston is located on the front side with the large diameter portion located on the rear side, a backpressure fluid chamber is defined at the rear of the large diameter portion.
A front output fluid chamber connected to the corresponding front brake and a rear output fluid chamber connected to the corresponding rear brake are defined at different locations at the front of the small diameter portion.
The front output fluid chamber and the rear output fluid chamber communicate with each other when the stepped piston is displaced toward the backpressure fluid chamber.
A cut-off valve portion is formed on the front of the small diameter portion of the stepped piston.
When the stepped piston is moved forward, the cut-off valve portion comes into contact with a cut-off valve seat formed on the cylinder to cut off the communication between the front output fluid chamber and the rear output fluid chamber
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