BALL SCREW MECHANISM AND LINEAR MOTION DEVICE

WIPO Patent Application WO/2020/240743

A1

Provided is a ball screw mechanism that can prevent vibration and noise and avoid an increase in heat by ensuring smooth movements of balls without the occurrence of obstructions or the like of the balls on a screw shaft, and without the need to consider the return of the balls as in a conventional circulation-type ball screw. The present invention is provided with a screw shaft 2 that has a spiral groove 2a and extends linearly; a housing 30 that surrounds the circumference of the screw shaft 2; and a plurality of balls 4 and ball bearings 5 that transmit the thrust of the screw shaft 2 to the housing 30. The ball bearings 5 each have outer rings 7 that are attached and fixed to the housing 30 at predetermined intervals along the spiral groove 2a of the screw shaft 2, and inner rings 6 provided with a concave spherical contact surface 5a, which is in contact with the balls 4, on the side surface facing the screw shaft 2. The inner rings 6 are installed so as to be rotatable about rotation axes N1-N4 that cross the rotation axis O of the screw shaft 2. The balls 4 are disposed adjacent to the inside of the spiral groove 2a of the screw shaft 2 at predetermined intervals while in contact with the contact surfaces 5a of the ball bearings 5.

MIZUNO HAYATO (JP)

PCT/JP2019/021390

December 03, 2020

May 29, 2019

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MIZUNO HAYATO (JP)

F16H25/22

WO2008013150A1

2008-01-31

JPH11514076A	1999-11-30
JP2011112128A	2011-06-09
JPH0470505B2	1992-11-11
JP2002327741A	2002-11-15
JPS56113253U	1981-09-01
JPS56147956A	1981-11-17

TSUJITA Tomoko (JP)

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