Patent ID: 8499660
Filing Date: 2013-08-06
Classification: B21C,B21D,B21K,B23P,B62D,C21D,F16H,Y10T

Abstract:
1. A hollow rack in which a rack is formed at a portion on one end side while an end portion of a cylindrical other end side is narrowed by reducing a diameter thereof, wherein an adjoining portion continuous to both ends of the rack has an inclined portion opposing each of tooth side faces of rack teeth positioned on both ends of the rack and set to 25° or more with respect to a radial direction, wherein a pressure contact trace is formed in the inclined portion so as to face a depression between the inclined portion and the tooth side face, and a radius of an inner diameter of a circular face joining a flat face orthogonal to the radial direction and the inclined portion is 0.5 mm or more.