Patent ID: 6925899
Filing Date: 2005-08-09
Classification: B21K,B62D,F16H,Y10T

Abstract:
1. A steering rack bar, which is hollowed in an overall length, and has a rack on a part of the length: wherein the rack bar is comprised of a rack-formed section and a non-rack-formed section, wherein the rack-formed section contains one end of the rack bar, the rack and a portion of a succeeding circular cross-sectional part, and the non-rack-formed section contains a residual length other than the rack-formed section; and the rack bar is constructed by joining the rack-formed section and the non-rack-formed section, wherein constituents of steels are different between the rack-formed section and the non-rack-formed section and carbon content of the non-rack-formed section is higher than that of the rack-formed section.