| 摘要 |
The ball screw apparatus apparatus of end cap type comprises a ball nut which includes a nut main body (6a) having a ball circulation hole (8) penetrating through the nut main body in the axial direction thereof and two end caps (20) respectively fixed to the two end portions of the main body and defining two ball circulation R portions (7) between the end faces of the nut main body and themselves. A guide groove for a ball is ball is defined only on the face side of the nut main body to thereby define the ball circulation R portion, and the shape of the surfaces of the surfaces of the end cap, which are disposed opposed to the end faces of the nut main body, are defined substantially uniform over the entire peripheries thereof. <IMAGE> |
