BALL SCREW DEVICE

摘要

A ball screw device includes a screw shaft; a ball nut; a first deflector fitted to an end portion of the ball nut; a ball guide portion that guides balls positioned in a helical inner ball passage formed by the ball nut and the screw shaft, to a first end portion ball passage in the first deflector; the balls that are set to form a row extending in the inner ball passage and the first end portion ball passage; and a first elastic member having a base end that is positioned in the first end portion ball passage and a distal end that is disposed and accommodated in the first end portion ball passage so as to be able to contact the ball positioned at one end of the row of the balls.

主权项

1. A ball screw device comprising:
a screw shaft having an outer peripheral surface on which a screw groove is formed; a ball nut that is externally fitted to the screw shaft, the ball nut having an inner peripheral surface on which a screw groove is formed; an end portion constituent member that is fitted to at least one of end portions of the ball nut in an axial direction and has an annular first ball passage in which a plurality of balls is able to move; a ball guide portion that guides the balls positioned in a helical second ball passage formed by the screw grooves of the ball nut and the screw shaft or the balls discharged from the second ball passage, to the first ball passage; the balls that are set to form a row extending in the first and second ball passages; and an elastic member that is configured to be elastically deformable, the elastic member having one end that is positioned in the first ball passage and the other end that is disposed and accommodated in the first ball passage so as to be able to contact the ball positioned at an end of the row of the balls.