| 摘要 |
A safety device for use in a hydraulic brake for vehicles, comprising a valve inserted in the hydraulic pressure circuit connecting a tandem type master cylinder for the vehicle hydraulic brake and the rear/front wheel cylinders. The valve comprises (a) a valve casing; (b) a ball containing chamber, formed in the valve casing, constituting a part of the hydraulic pressure circuit to the rear wheel cylinders; (c) a ball accommodated in the ball containing chamber, and rolling up along a slope due to inertia, when the deceleration rate of the vehicle exceeds a predetermined value, to closely contact to a valve seat for blocking the braking-fluid path to the rear brake circuit; (d) a differential piston containing chamber; and (e) a differential piston axially slidably fitted in the differential piston containing chamber and being, on either end surface, subjected to hydraulic pressure of the rear brake circuit and the front brake circuit, wherein when the former brake circuit is damaged it is slidden toward the ball, by virtue of the pressure difference between the two circuits, to press the ball against the valve seat, and when the latter circuit is damaged it is slidden in the reverse direction similarly due to the pressure difference to block the braking-fluid path to the front brake circuit.
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