专利名称：Hollow rack shaft and manufacturing
method thereof
发明人：Tsubouchi, Akira,Okubo, Kiyoshi,Watanabe,
Yasushi
申请号：EP01129365.1申请日：20011217公开号：EP1215102A2公开日：20020619
专利附图：
摘要：The object of the invention is to provide a rack shaft having two rack teethgroups (A2,B2) and hollowed throughout the whole body, to lightweightize the shaft andto reduce the cost. The two rack teeth groups (A2,B2) are located longitudinally apartfrom each other and have phase difference related to an angle around the axis of theshaft. After the two rack teeth groups (A2,B2) are formed simultaneously or sequentiallyby die forming on the flat bottoms of the workpiece beforehand gutter-shaped, the legsof the gutter-shaped workpiece are bent to butt to each other and, thereby, a tubularbody of the shaft is given to the workpiece. The centers of the material are offsetbeforehand corresponding to the phase difference.
申请人：NSK Ltd.
地址：6-3, Ohsaki 1-chome Shinagawa-ku, Tokyo 141-8560 JP
国籍：JP
代理机构：HOFFMANN - EITLE
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