Patent ID: 9545905
Date: 2017-01-17
CPC Classifications: B60T,F15B

Claim:
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.