Thk Co., Ltd.

Takuma Tsunoda

Hiroyuki Kishi

Shinji Aoki

Mitsumasa Wada

Hiroyoshi Yasutake

Eriko Oshima

Kentaro Hikomoto

A motion guide apparatus is provided which can prevent a ball from contacting an edge of a ball rolling groove of a track member when the ball transfers from a rolling surface of the inner peripheral side of a turn-around path (an inner peripheral-side component) to the track member. The motion guide apparatus includes: a track member () including a ball rolling groove (); and a moving member assembled to the track member () in such a manner as to be movable relative to the track member (). The moving member includes: a moving member body having a loaded ball rolling groove facing the ball rolling groove (), and a return path substantially parallel to the loaded ball rolling groove; and a lid member having a turn-around path. In cross section of the motion guide apparatus perpendicular to a length direction of the track member (), letting the radius of curvature of the ball rolling groove () be R, and letting the distance from a ball center (O) to a rolling surface () of the inner peripheral side of the turn-around path (an inner peripheral-side component ()) be r, R>r is set.

Motion guide apparatus

A motion guide device includes: a track member including a rolling member rolling surface; a movable member including a loaded rolling member rolling surface, and a rolling member return passage; a pair of cap members including a direction change passage connecting the loaded rolling member rolling surface and the rolling member return passage; and a plurality of rolling members arrayed in a rollable manner on a loaded rolling member rolling passage, the rolling member return passage, and a pair of the direction change passages, the loaded rolling member rolling passage being made up of the rolling member rolling surface and the loaded rolling member rolling surface. A gap between the rolling member and the direction change passage at a boundary portion X is formed so as to become smaller than a gap between the rolling member and the rolling member rolling surface at the boundary portion.

Motion guide device

Growing community of inventors

Tokyo, Japan

Takuma Tsunoda