Title:
BALL SCREW DEVICE AND BALL EVEN COMB
Document Type and Number:
Japanese Patent JP2022183627
Kind Code:
A
Abstract:
To provide a ball screw device in which a cage hardly comes off from a ball.SOLUTION: A ball screw device includes a nut and a bearing. An outer peripheral surface of the nut includes an outer peripheral groove part, an outer peripheral first groove shoulder part, and an outer peripheral second groove shoulder part. The bearing includes an outer ring, a plurality of balls, and a crown type cage. An inner peripheral surface of the outer ring includes an inner peripheral groove part, an inner peripheral first groove shoulder part, and an inner peripheral second groove shoulder part. The outer peripheral second groove shoulder part has an outer diameter smaller than that of the outer peripheral first groove shoulder part, and the inner peripheral second groove shoulder part has an inner diameter smaller than that of the inner peripheral first groove shoulder part. The crown type cage is arranged in a second direction with respect to the ball, is positioned between the outer peripheral second groove shoulder part and the inner peripheral second groove shoulder part, and includes an annular body part in which the center in the radial direction is off-set further to the inside in the radial direction than the center of the ball, and a plurality of column parts extending in a first direction from the body part and arranged between the balls. The body part has a protrusion protruding at least in one radial direction. At least one of the outer peripheral second groove shoulder part and the inner peripheral second groove shoulder part has a part to be engaged which can be engaged with the protrusion.SELECTED DRAWING: Figure 3
Inventors:
MIWA TAKUYA
SAKOTA HIROSHIGE
CHIHARA YUTA
KURODA TAKEHIRO
SAKOTA HIROSHIGE
CHIHARA YUTA
KURODA TAKEHIRO
Application Number:
JP2021091053A
Publication Date:
December 13, 2022
Filing Date:
May 31, 2021
Export Citation:
Assignee:
NSK LTD
International Classes:
F16H25/24; F16C19/16; F16C31/04; F16C33/38; F16C33/58; F16C43/06; F16H25/22
Attorney, Agent or Firm:
Sakai International Patent Office