| 摘要 |
<P>PROBLEM TO BE SOLVED: To standardize a ball race for using it in different models of construction machine, and improve the assembling efficiency of the ball race. <P>SOLUTION: The ball race has an outer race 21 which is fitted rotatably to the outer periphery of an inner race 17, which is fixed to the lower running body side, via a roller, and is fastened to the lower face of a base plate of a swiveling frame of an upper swiveling body by tightening a plurality of bolts. The outer race 21 has a plurality of bolt insertion holes 26, through which the bolts are inserted, and given bolt insertion holes out of the plurality of bolt insertion holes are formed into slot holes 26a each having a given length along the circumference of the outer race 21. <P>COPYRIGHT: (C)2007,JPO&INPIT |
