Title:
BALL SCREW DEVICE AND DOUBLE-ROW BEARING DEVICE
Document Type and Number:
Japanese Patent JP2019190556
Kind Code:
A
Abstract:
To provide a ball screw device which can reduce a pressing force necessary for imparting a sufficient preload to a double-row bearing device irrespective of a dimension of the double-row bearing device, and the double-row bearing device.SOLUTION: A double-row bearing device 10 comprises: an outer ring 120; a first inner ring main body 131 which is arranged at a cylinder part 82 so as to be integrally rotatable to an external peripheral face of the cylinder part 82; a second inner ring main body 141 fit to the external peripheral face of the cylinder part 82 with an interval between the first inner ring main body 131 and itself in an axial line direction; and a portion being at least either of a first region protruding toward the second inner ring main body 141 from a first end face 136 of the first inner ring main body 131 opposing the second inner ring main body 141, and a first region protruding toward the first inner ring main body 131 from a second end face 146 of the second inner ring main body 141 opposing the first inner ring main body 131, and small in a projection area smaller than the first end face 136 and the second end face 146 when viewed from the axial line direction.SELECTED DRAWING: Figure 3
Inventors:
TOMIKAWA TAKASHI
Application Number:
JP2018083228A
Publication Date:
October 31, 2019
Filing Date:
April 24, 2018
Export Citation:
Assignee:
JTEKT CORP
International Classes:
F16H25/22; F16C19/18; F16C25/08; F16C35/073; F16H25/24
Attorney, Agent or Firm:
Kobayashi Osamu
Kiichi Yamamoto
Kimura Gunji
Kiichi Yamamoto
Kimura Gunji