Hydraulischer Modulator für Bremsvorrichtungen

摘要

To provide a hydraulic modulator (60) for a brake device which can be reduced in size by improving the arrangement of components and the internal structure. Disclosed herein is a hydraulic modulator (60) including a cylinder (64) for slidably supporting a power piston (35) and changing the volume of a hydraulic chamber (65) communicating with brake calipers (80) according to the sliding of the power piston (35), and an electric motor (63) for sliding the power piston (35) through power transmitting means. The cylinder (64) extends parallel to a rotating shaft (73), and a rotational motion of the electric motor (63) is converted into a linear motion on an axis parallel to the rotating shaft (73). The power transmitting means is provided by a ball screw mechanism composed of a ball screw nut (77), balls (78), and a ball screw shaft (79) for converting the rotational motion of the electric motor (63) into the linear motion of the push slider (68). The push slider 68 has a head portion (68a) coming into spherical contact with the power piston (35).