| 摘要 |
PROBLEM TO BE SOLVED: To provide a reduction gear, an electric power steering device and a worm which can reduce the generation of noise over a long period of time. SOLUTION: In an engagement area A, the helical tooth bottom 62 of a worm 20 has a helically extending release groove 64 for a lubricant. The release groove 64 is formed in an intermediate position A1 in a worm shaft direction 65 on the tooth bottom 62 of the worm 20. Buffering material particles of the lubricant can be prevented from being crushed between the tooth tip surface 63 of the worm wheel 21 and the tooth bottom 62 of the worm 20 in the engagement area A. COPYRIGHT: (C)2008,JPO&INPIT
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