Kuroda Precision Industries Ltd.

Hitoshi Hakogi

Yoshimi Iwasaki

Ryo Kaibe

Tatsuto Omori

An end deflector includes a main portion including a ball delivery path that delivers balls between a rolling path and a ball return path, a tongue portion that guides the balls from the rolling path to the ball delivery path, and a pair of protruding pieces, that extend in the circumferential direction of each nut body from either side of the tongue portion with respect to the axial direction and define a ball guide groove that extends between the ball delivery path and the rolling path in cooperation with an inner circumferential surface of a deflector holding recess formed in a nut body, the main portion has an outer circumferential surface which opposes an inner circumferential surface of the deflector holding recess in the radial direction, a front-side portion of the outer circumferential surface with respect to a direction of insertion into the deflector holding recess is offset inward in the radial direction, and at least a rear-side portion of the outer circumferential surface with respect to the direction of insertion into the deflector holding recess is fitted to the inner circumferential surface of the deflector holding recess.

Ball screw

To prevent the positional precision of the ball return passage and the tongue of the end deflector relative to the nut main body from being impaired by an axial force applied by a screw used for securing the end deflector to the nut main body, the end deflector includes a flange () provided at an axial end of a main part () of the end deflector and provided with an axial through hole () for receiving a screw which is threaded into the nut main body, and a rib () projecting from a radially inner edge of the flange to an inner side of the deflector receiving recess ().

Growing community of inventors

Kimitsu, Japan

Hitoshi Hakogi