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US 12,117,069 B2Granted
Linear motion device
AssigneeFanuc Corporation
InventorsMizuho Yamasaki, Hisanori Kouda
Life of this patent
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Abstract
A linear motion device includes: a bearing mounted to the outer periphery of a ball screw; a nut holder through which the ball screw passes; and a bearing pressing member which is fixed to a motor housing with the ball screw inserted in a through hole and which restricts the movement of the bearing in the motor housing in the axial direction. The bearing pressing member has a cutout portion extending from the inner peripheral surface of the through hole over to the outer peripheral surface of the bearing pressing member in the radial direction.
Claims14
A linear motion device comprising:
- a ball screw;
- a nut configured to move with respect to the ball screw in an axial direction thereof in accordance with rotation of the ball screw;
- a bearing mounted on an outer periphery of the ball screw;
- a housing configured to support the ball screw through the bearing;
- a nut holder configured to hold the nut therein and through which the ball screw passes;
- and
- a restricting member that has a through hole in a center portion thereof, is disposed between the bearing and the nut holder, is fixed to the housing in a state where the ball screw is inserted into the through hole, and restricts movement of the bearing in the axial direction in the housing,
- wherein the restricting member includes a cutout portion extending in a radial direction from an inner peripheral surface of the through hole to an outer peripheral surface of the restricting member, and
- wherein the ball screw includes a planar portion formed by partially cutting out a part of an outer peripheral surface of the ball screw.
6 more elements
Dependencies are inferred from the claim text.