PROBLEM TO BE SOLVED: To provide a rack shaft capable of reducing a shaft length thereof, and to provide a power steering device equipped with the rack shaft.SOLUTION: A rack shaft (13) according to this invention includes an effective rack tooth row (131) formed by the plastic deformation of a shaft member (W) and having a plurality of rack teeth engaging with a pinion (7a), a ball screw part (13B) not having the rack teeth, an ineffective rack teeth (134) formed between the effective rack tooth row (131) and the ball screw part (13B) and free from engaging with the pinion (7a), and a padding part (135) extending from the end of the ball screw part (13B) to the ineffective rack teeth (134) and covering at least part of the ineffective rack teeth (134).SELECTED DRAWING: Figure 3A
【課題】軸長の短縮化を図ることができるラック軸及びそのラック軸を備えるパワーステアリング装置を提供する。【解決手段】本発明に係るラック軸(13)は、軸部材(W)の塑性変形により形成されて、ピニオン(7a)と噛み合う複数のラック歯を有する有効ラック歯列(131)と、ラック歯を有しないボールネジ部(13B)と、有効ラック歯列(131)とボールネジ部(13B)との間に形成されて、ピニオン(7a)と噛み合うことのない無効ラック歯(134)と、ボールネジ部(13B)の端部から無効ラック歯(134)に向けて延びて、無効ラック歯(134)の少なくとも一部を覆う肉盛部(135)と、を備える。【選択図】図3A
RACK SHAFT AND STEERING DEVICE
ラック軸及びステアリング装置
2016-09-29
Patent
Electronic Resource
Japanese
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