Patent ID: 8801113
Filing Date: 2014-08-12
Classification: B60T

Abstract:
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 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.