BRAKE DEVICE

摘要

A master cylinder 5 includes: a first liquid chamber 51 generating a liquid pressure in response to a brake operation of a driver; and a second liquid chamber 52 communicated with a reservoir 4 and connected to a suction port 70 of a pump 7. In a state in which the reservoir 4 and a suction section 70 of the pump 7 are communicated via the second liquid chamber 52, a liquid pressure of the first liquid chamber 51 can create a wheel cylinder liquid pressure.

主权项

1. A brake device comprising:
a brake operation state detecting section configured to detect an operation state of a brake operation member by a driver; a pump creating a wheel cylinder liquid pressure on a basis of the brake operation state detected by the brake operation state detecting section; a bottomed cylindrical cylinder main body having a first liquid chamber, in which a drain port connected to a wheel cylinder is equipped, generating a liquid pressure in response to the brake operation by the driver and a second liquid chamber in which a suction port connected to a suction section of the pump and an auxiliary supply port communicated with a reservoir are equipped; a piston slidably inserted through an inner peripheral surface of the cylinder main body and interlinked with the brake operation member; a master cylinder in which a first piston seal sealing between an inner peripheral surface of the cylinder main body and an outer peripheral surface of the piston to define the first liquid chamber, a second piston seal to define the second liquid chamber together with the first piston seal, and a third piston seal sealing between the inner peripheral surface of the cylinder main body and the outer peripheral surface of the piston and interrupting the auxiliary supply port and the suction port when the piston strokes by a distance equal to or longer than a predetermined stroke are equipped; a first brake liquid pressure creation apparatus creating the wheel cylinder liquid pressure through the liquid pressure of the first liquid chamber in a first state in which the auxiliary supply port and the suction port are communicated and in a second state in which the auxiliary supply port and the suction port are interrupted when the piston strokes by a distance equal to or longer than a predetermined stroke; and a second brake liquid pressure creation apparatus creating the wheel cylinder liquid pressure by sucking the brake liquid within the reservoir through the pump via the auxiliary supply port, the second liquid chamber, and the suction port.