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Patent Searching and Data


Title:
BALL SCREW AND MANUFACTURING METHOD OF BALL SCREW
Document Type and Number:
Japanese Patent JP2017207092
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a ball screw which shortens a processing time for forming a screw groove at a screw shaft, and can reduce a time and labor of manufacturing, and a manufacturing method of the ball screw, in the ball screw in which a ball circulation groove for circulating balls is formed at the screw shaft.SOLUTION: An angle θE which is formed of a tangent TE of an external peripheral face of a screw shaft 5 with a cross point between a cross section of a chamfered part 31e of a circulation part 19 and an external peripheral face of the screw shaft 5 as a contact point, and a cross section of the chamfered part 31e is larger than an angle θD which is formed of a vertical line L1 lowered up to a center axial line of a nut 3 from a groove bottom of the screw groove 9 at the nut 3 side, and a linear line L2 passing a center C1 of a circle including a disc circular part being a cross section of a curved face 25d of the screw groove 9 at the nut 3 side, and also passing an inner end of the disc circular part in a radial direction.SELECTED DRAWING: Figure 5

Inventors:
WATANABE YASUMI
Application Number:
JP2016097961A
Publication Date:
November 24, 2017
Filing Date:
May 16, 2016
Export Citation:
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Assignee:
NSK LTD
International Classes:
F16H25/22; B23C3/00; B23G1/32
Attorney, Agent or Firm:
Yoshio Inoue
Kenichi Aihara
Ryuji Ito
Junko Inoue