| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball screw reducing contact, friction and collision sound between balls by a spacer with preventing the spacer from falling down, while securing load capacity. SOLUTION: A spacer 6 is interposed between each ball 3, 3 provided between a screw shaft 1 and screw grooves 4, 5 of a nut 2. The spacer 6 is formed into an ended ring-shape in which both surfaces are formed into substantially recessed spherical shapes. For instance, both ends of the circumferential direction are shifted each other in the axial direction in the spacer 6. The spacer 6 may be elastically deformable till the balls 3, 3 on both sides come into contact with each other because the spacer 6 is made of synthetic resin and is pressed between the balls 3 on both sides. |
