| 摘要 |
<P>PROBLEM TO BE SOLVED: To materialize structure of a rack shaft 7a constituting a rack pinion type steering gear unit and a method of manufacturing the rack shaft 7a, the structure enabling rack teeth 17a to be accurately formed in the process of manufacturing and the bending of the shaft to be accurately measured before bending correction work, and the structure further enabling the turning prevention function of the shaft in use to be increased. <P>SOLUTION: The rack shaft 7a is made by forming the rack teeth 17a on the front face of an intermediate material which is constituted by cutting a drawn material at a prescribed length, wherein the outer circumference of the drawn material has a nearly polygonal cross section in which each apex is a circular arc with an equal radius of curvature around the center axis of the drawn material. The forming work of the rack teeth 17a is performed with an implement which is non-circularly engaged with a part of the outer circumference of the intermediate material, in a state in which the rotation of this intermediate material is inhibited. The bend measurement of the intermediate material is performed on the basis of the measurement of rotation deviation of a part corresponding to the circular arc part in the outer circumference of the intermediate material. <P>COPYRIGHT: (C)2012,JPO&INPIT |
