| 摘要 |
PROBLEM TO BE SOLVED: To overcome the processing difficulty owing to a high hardness after a heat treatment, establish a fine outside appearance owing to the structure in which no through hole of the round-flow hole remains at the outside surface of the nut, give good dust-proof effect, and reduce the emission of noises. SOLUTION: The nut 2 is composed of a runway groove 21 assuming spirally where rolling element(s) 3 rolls on, a round-flow metal piece 5 furnished with a turning path 51 where the rolling element turns its rolling direction into circulation, and the round-flow hole 22 which is prepared through discharge machining and in which the round-flow metal piece is fitted. COPYRIGHT: (C)2005,JPO&NCIPI
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