Patent ID: 9682721
Date: 2017-06-20
CPC Classifications: B62D,B62K,Y10T

Claim:
1. An arm stopper mechanism, comprising: a pitman arm which turns around an output shaft on a lower face side of a housing of an electric power-steering device and to which two tie rods connected to wheels are mounted; and a stopper which is provided around the output shaft on the lower face side of the housing of the electric power-steering device and which restricts a turning angle of the pitman arm, wherein the pitman arm includes: the stopper includes two contact faces provided at positions in a turning direction of the abutting faces of the pitman arm on left and right of the center line and which come into contact with the respective abutting faces of the pitman arm, an internal angle formed by the two contact faces of the stopper is greater than an internal angle formed by the two abutting faces of the pitman arm and is more than 90°, said internal angle defined by the two contact faces of the stopper being formed in such a manner that a bisector thereof intersects the stopper and the stopper is contained within the internal angle formed by the two contact faces of the stopper, the pitman arm is formed in a plate shape as a whole and a shape thereof viewed from a lower side is a shape of a fan which spreads at an acute angle, the output shaft hole is disposed at a position of a pivot of the fan, and the two tie rod holes are disposed in a vicinity of both wings in a vicinity of a free end of the fan, the two abutting faces of the pitman arm are respectively provided to side face portions of a protruding part which protrudes upward in a vicinity of a center of a top face of a body of the pitman arm, the stopper is provided in a manner of protruding in a downward direction from the lower face side of the housing of the electric power-steering device, and a shape thereof viewed from a lower side is a shape which connects a trapezoidal part of a substantially trapezoidal shape and a rectangular part of a substantially rectangular shape with each other, the trapezoidal part and the rectangular part are disposed such that a central point on a lower side of the trapezoidal part and a central point on a long side of the rectangular part coincide with a central point of the output shaft, and the rectangular part is configured such that a short side is a width of a value which is the same as a clearance between a parallel plane, which passes a center point of the output shaft hole of the pitman arm and is parallel to the abutting face, and the abutting face, and a long side on a side that is not connected with the trapezoidal part functions as the contact face.