| 摘要 |
PURPOSE:To make a liquid-pressure circuit simple and compact by conducting an operation to cut off from a liquid passage the wheel-cylinder of a follower wheel at the time of wheel acceleration slip control by means of a cutting valve portion communicating with the action of a pressure intensifying piston. CONSTITUTION:As for wheel lock prevention control, a cut-off valve CV is opened by a wheel lock control signal, so with the movement of a valve device V, the liquid pressure of an accumulator 11 is introduced into the back chamber R2 of a depressurizing cylinder device R, or the liquid pressure inside the back chamber R2 is discharged into a reserver 5, and a depressurizing piston RP is moved. Thereby, the speed reduction control without any wheel-lock occurrence is done. As for wheel acceleration slip control, the liquid pressure of the accumulator 11 is introduced into the rear chamber T2 of a pressure intensifying cylinder device TC by the movement of the valve device V, and a pressure intensifying piston TP moves to the liquid sending chamber T1 side, and the brake pressure of a liquid passage 3 is heightened. A cutting valve portion KV is closed in communication with this, and the communication of a wheel cylinder Cf with the liquid-sending chamber T1 is cut off, and the braking by a wheel cylinder cd is executed.
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