초록 ▼

A hydraulic brake apparatus includes a control valve having a spool which is bi-directionally movable between a first position and a second position, the spool, when located at the first position, allowing brake fluid from a low-pressure source to pass through the control valve to a wheel cylinder,

A hydraulic brake apparatus includes a control valve having a spool which is bi-directionally movable between a first position and a second position, the spool, when located at the first position, allowing brake fluid from a low-pressure source to pass through the control valve to a wheel cylinder, and the spool, when located at the second position, allowing brake fluid from a high-pressure source to pass through the control valve to the wheel cylinder. A first unit introduces brake fluid from the wheel cylinder into the control valve, the brake fluid having a wheel cylinder pressure exerted to move the spool in a first direction toward the first position. A second unit introduces brake fluid from a master cylinder into the control valve, the brake fluid having a master cylinder pressure exerted to move the spool in a second, reverse direction toward the second position. A third unit reduces the master cylinder pressure exerted on the spool.

대표청구항 ▼

[ What is claimed is:] [1.] A hydraulic brake apparatus comprising:control valve means having a spool which is bi-directionally movable between a first position and a second position, said spool, when located at the first position, allowing brake fluid from a low-pressure source to pass through the

[ What is claimed is:] [1.] A hydraulic brake apparatus comprising:control valve means having a spool which is bi-directionally movable between a first position and a second position, said spool, when located at the first position, allowing brake fluid from a low-pressure source to pass through the control valve means to a wheel cylinder, and said spool, when located at the second position, allowing brake fluid from a high-pressure source to pass through the control valve means to the wheel cylinder;first means for introducing brake fluid from the wheel cylinder into the control valve means, said brake fluid having a wheel cylinder pressure exerted to move the spool in a first direction toward the first position;second means for introducing brake fluid from a master cylinder into the control valve means, said brake fluid having a master cylinder pressure exerted to move the spool in a second, reverse direction toward the second position; andthird means for reducing the master cylinder pressure exerted on the spool.