To prevent deformation of a slider according to a variation in temperature, and also to prevent abnormal movement of rolling elements, in a direct acting device having the slider formed by integrating a metal body with a synthetic resin compact.
The slider 2 is formed of the metal body 4, the synthetic resin frame body 5, and an end cap 6. The frame body 5 is detachably fitted to the outside of the body 4. A rolling groove 21a is formed in the body 4. A return passage 21b and a turning passage inside groove 53 are formed in the frame body 5. A turning passage outer groove 63a is formed in the end cap 6. The length L5 of the outer leg 51 of the frame body 5 is set shorter than the length L4 of the inner leg 41 of the body 4, and the lateral dimension of the slider on the outer leg 51 side is also reduced by W on both right and left sides. The diameter of the return passage 21b in cross section is set larger than the diameter of the metal ball 3.
Yoshiaki Naito
Cui Shu Tetsu