Nippon Thompson Co., Ltd.

Toshimichi Tanaka

Kazuki Yamada

Tamotsu Iwata

Yasuhiro Otsuji

Shunya Yamazaki

In a linear motion guide unit, a raceway groove formed in a casing of a slider includes a first raceway surface extending along the length direction of the slider and a second raceway surface facing the first raceway surface and extending along the length direction of the slider. The second raceway surface includes a first portion including a center portion in a length direction of the casing, and a second portion including end portions in the length direction of the casing and having a wall surface shape different from a wall surface shape of the first portion. In the first portion, the first raceway surface and the second raceway surface define a symmetric Gothic arch groove, and in the second portion, the second raceway surface has a surface recessed from a position symmetric to the first raceway surface.

Linear motion guide unit

A linear motion guide unit includes a rail having first rolling surfaces extending longitudinally parallel to each other, a movable slider fitting over the rail, second rolling surfaces opposing the first rolling surfaces, respectively, rolling elements that roll while contacting the first and second rolling surfaces, a loop path through which the rolling elements circulate composed of a load-carrying race formed with the first and second rolling surfaces, a first circulation passage formed in the slider parallel to the load-carrying race, and two second circulation passages connecting the load-carrying race and the first circulation passage. The load-carrying race has a first portion at a boundary with the second circulation passage, and a contact angle of the rolling element with the second rolling surface in the first portion is greater than a contact angle of the rolling element with the second rolling surface in a remaining portion of the load-carrying race.

Growing community of inventors

Mino, Japan

Toshimichi Tanaka