Antilocking apparatus for vehicle

Claim 2

An antilocking apparatus for performing antilocking operation for a wheel brake of a vehicle, said antilocking apparatus comprising: a master cylinder; an inlet valve provided in a fluid path connecting said master cylinder with said wheel brake to allow/cut off communication between said master cylinder and said wheel brake through said fluid path; an electrically switch-controlled outlet valve capable of discharging working fluid from a fluid path portion connecting said inlet valve with said wheel brake; a damping reservoir for temporarily storing said working fluid discharged through said outlet valve; and a pump for drawing said working fluid stored in said damping reservoir to deliver the same into said fluid path portion connecting said inlet valve with said wheel brake, said inlet valve being formed by a differential pressure conscious valve actuated by differential pressure between fluid pressure in said fluid path portion connecting said inlet valve with said wheel brake and that in a fluid path portion connecting said inlet valve with said outlet valve.

Claim 3

An antilocking apparatus for a vehicle in accordance with claim 1, wherein said differential pressure conscious valve cuts off communication between said master cylinder and said wheel brake through said fluid path upon initiation of operation for opening said outlet valve, and brings said master cylinder and said wheel brake into communication again through said fluid path after a lapse of a constant time upon completion of said operation for opening said outlet valve.

Claim 4

An antilocking apparatus for a vehicle in accordance with claim 1, wherein said differential pressure conscious valve comprises: a case, a spool being slidable along the inner surface of said case and having a first end facing a fluid path portion communicating with said wheel brake and a second end facing a fluid path portion communicating with said outlet valve, and a spring for urging said spool toward said first end, said spool being provided with an orifice connecting said fluid path portion communicating with said wheel brake and said fluid path portion communicating with said outlet valve.

Claim 5

An antilocking apparatus for a vehicle in accordance with claim 3, wherein said case has a plurality of ports, and configurations of said case and said spool and positional relation therebetween are selected to implement three states including: a first operating state of allowing communication between said master cylinder and said wheel brake through a large passage, communication between said master cylinder and said outlet valve through said orifice and communication between said wheel brake and said outlet valve through said orifice; a second operating state of cutting off communication between said master cylinder and said wheel brake as well as communication between said master cylinder and said outlet valve and allowing communication between said wheel brake and said outlet valve through a large passage; and a third operating state of cutting off communication between said master cylinder and said wheel brake as well as communication between said master cylinder and said outlet valve and allowing communication between said wheel brake and said outlet valve through said orifice.

Claim 6

An antilocking apparatus for a vehicle in accordance with claim 1, wherein said outlet valve includes a flow regulating valve for allowing passage of said working fluid through said outlet valve at a constant flow rate.