Brake apparatus

摘要

A brake apparatus including a housing, a piston body disposed within each of a pair of closed-ended bores formed in the housing, a first elastic member that biases the piston body toward a closed end of the respective bores, a fluid passage opened to the closed end of the respective bores, a pressure regulating valve disposed in the fluid passage, and a rotary gear pump disposed in a region between the pressure regulating valve disposed in the fluid passage opened to the closed end of one of the bores and the pressure regulating valve disposed in the fluid passage opened to the closed end of the other of the bores. The fluid passages are formed to be offset from respective central axes of the piston bodies in such a direction that the fluid passages are spaced apart from each other.

主权项

1. A brake apparatus comprising:
a housing; a pair of closed-ended bores formed in the housing; a pair of piston bodies, each disposed within a respective closed-ended bore formed in the housing; a first elastic member configured to bias a piston body toward a closed end of a respective bore; a pair of fluid passages, wherein each fluid passage is opened to the closed end of a respective bore, wherein each fluid passage has a diameter smaller than a diameter the respective bore, and wherein the pair of fluid passages are formed to be offset from respective central axes of the piston bodies in such a direction that the pair of fluid passages are spaced apart from each other; a pair of pressure regulating valves, each disposed in a respective fluid passage, and each pressure regulating valve including:
a valve element,a seat portion brought into contact with the valve element,a rod disposed between a crown surface of a respective piston body and the valve element, the rod configured to move the valve element apart from the seat portion, anda second elastic member having one end contacted with the valve element and biasing the valve element toward the seat portion, the second elastic member having an elastic force smaller than that of the first elastic member; and a rotary gear pump configured to suck brake fluid through the pair of pressure regulating valves, wherein the rotary gear pump is disposed in a region between the pair of pressure regulating valves; a pair of small-diameter fluid passages, wherein each small-diameter fluid passage has a diameter smaller than that of a respective fluid passage to which the small-diameter fluid passage is connected, wherein each small-diameter fluid passage is connected to a reduced diameter portion of the respective fluid passage, and wherein each small-diameter fluid passage is arranged in series with respect to the respective fluid passage, a seat member fixedly disposed within a respective fluid passage, and formed with a respective seat portion; a closed-ended cylindrical filter member fixed to the seat member and retaining the other end of the second elastic member, the closed-ended cylindrical filter member including a plurality of projecting portions formed on a crown surface of the closed-ended cylindrical filter member, wherein each projecting portion is engaged with a reduced diameter portion in order to ensure a fluid path of the brake fluid flowing from the respective small-diameter fluid passage to the respective fluid passage.