Electric brake device

摘要

An electric brake device includes a first slave piston which is housed in a cylinder body and generates hydraulic pressure in a first hydraulic chamber by moving forward, a motor which transmits a driving force to the first slave piston, and a restriction pin which is inserted and secured to the cylinder body in a direction perpendicular to an axial direction of the cylinder body and restricts a backward position of the first slave piston when a hydraulic pressure is applied from an outside to the first hydraulic chamber, wherein the restriction pin is inserted and secured to the cylinder mechanism in the direction perpendicular to the axial direction of the cylinder main body. Further, a clearance is formed between an inner peripheral wall of the cylinder body and a first groove portion and second groove portion which are formed on an outer surface of the restriction pin.

主权项

1. An electric brake device, comprising:
an output hydraulic pressure chamber connected to a wheel cylinder; a piston that generates a hydraulic pressure in the output hydraulic pressure chamber by moving forward; a cylinder that accommodates the piston in a cylinder body; a motor that drives the piston forward by transmitting a driving force thereof to the piston; and a restriction unit that restricts a backward movement of the piston when a hydraulic pressure is applied from an outside to the output hydraulic pressure chamber, wherein the restriction unit is composed of a restriction pin that is inserted and secured to the cylinder body in a direction perpendicular to an axial direction of the cylinder, wherein a tapered clearance is formed between an inner peripheral wall of the cylinder and an outer surface of the restriction pin, wherein the restriction pin has a central portion, having a first diameter, disposed centrally within the cylinder, first and second reduced diameter portions, having a reduced diameter smaller than the first diameter, adjacent to the central portion and disposed adjacent to the inner peripheral wall of the cylinder, and first and second ends, having the first diameter, respectively disposed adjacent to the first and second reduced diameter portions, and wherein the clearance is formed between the reduced diameter portion and the inner peripheral wall of the cylinder.