Ball screw device (140, 40, 40) in which an inner peripheral rolling groove (121A, 121, 21A, 21A, 21) formed in an inner peripheral surface (1) of a nut (21) is hardened by an inexpensive heat treatment without melting the edges (141B, 41B). The inner peripheral rolling groove (21a) of a nut (21) includes, between openings (41a and 42a) of mounting holes (41 and 42), a constant pitch circle diameter region (CoA) where a pitch circle diameter is constant and gradually-changing pitch circle diameter regions (ChA) where the pitch circle diameter gradually increases, in the ranges from opposite ends (45A, 45) of the constant pitch circle diameter region to the respective openings (141A, 141, 41A, 41, 53A, 53B). At least the constant pitch circle diameter region has a surface hardness greater than or equal to a predetermined value, among the constant pitch circle diameter region and the gradually-changing pitch circle diameter regions excluding edges (41b and 42b) at the boundaries between the respective openings (141A, 141, 41A, 41, 53A, 53B) and the inner peripheral rolling groove (121A, 121, 21A, 21A, 21), and the edges (141B, 41B) at the boundaries between the respective openings (141A, 141, 41A, 41, 53A, 53B) and the inner peripheral rolling groove (121A, 121, 21A, 21A, 21) have a surface hardness less than the predetermined value.
BALL SCREW DEVICE, METHOD OF MANUFACTURING BALL SCREW DEVICE, AND STEERING SYSTEM INCLUDING BALL SCREW DEVICE
KUGELGEWINDESPINDELVORRICHTUNG, VERFAHREN ZUR HERSTELLUNG EINER KUGELGEWINDESPINDELVORRICHTUNG UND LENKSYSTEM MIT EINER KUGELGEWINDESPINDELVORRICHTUNG
DISPOSITIF DE VIS À BILLES, PROCÉDÉ DE FABRICATION D'UN DISPOSITIF DE VIS À BILLES ET SYSTÈME DE DIRECTION INCLUANT UN DISPOSITIF DE VIS À BILLES
2020-09-23
Patent
Electronic Resource
English
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