PROBLEM TO BE SOLVED: To provide a compact ball screw device, and a steering device including the ball screw device, in which a retainer is not brought into contact with a deflector even when a position of the retainer is radially changed between a ball screw shaft and a ball nut.SOLUTION: A ball screw device 40 includes a ball screw shaft 21, a ball nut 42, a deflector 43, rolling balls 44 and a retainer 45. The deflector 43 guides the rolling balls 44 from a spiral raceway 47a to a connection passage 43b, and includes a guide tongue portion 43a projecting from an inner peripheral face 42a of the ball nut 42. A size of a first clearance D between the retainer 45 and the guide tongue portion 43a is larger than a size of a second clearance E1 between the retainer 45 and the ball nut 42, or larger than a size of a third clearance F between the retainer 45 and the ball screw shaft 21 in a state that the retainer 45 is disposed coaxially with the ball screw shaft 21 and the ball nut 42.SELECTED DRAWING: Figure 8
【課題】ボールねじ軸とボールナットとの間において、リテーナの位置が径方向において変動しても、デフレクタと当接しない、小型のボールねじ装置、及びボールねじ装置を備えたステアリング装置を提供する。【解決手段】、ボールねじ装置40は、ボールねじ軸21と、ボールナット42と、デフレクタ43と、転動ボール44と、リテーナ45と、を備える。デフレクタ43は、転動ボール44を螺旋軌道47aから連結通路43bに誘導し、ボールナット42の内周面42aから突出する誘導舌部43aを備える。リテーナ45がボールねじ軸21及びボールナット42と同軸に配置された状態において、リテーナ45と誘導舌部43aとの間の第一隙間Dの大きさは、リテーナ45とボールナット42との間の第二隙間E1の大きさよりも大きい、又はリテーナ45とボールねじ軸21との間の第三隙間Fの大きさよりも大きい。【選択図】図8
BALL SCREW DEVICE, AND STEERING DEVICE INCLUDING BALL SCREW DEVICE
ボールねじ装置、及びボールねじ装置を備えたステアリング装置
2018-03-08
Patent
Electronic Resource
Japanese
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