| 摘要 |
PROBLEM TO BE SOLVED: To reduce a production cost and increase the maximum load capacity. SOLUTION: Screw grooves 31a, 31b for an approximately one roll at least are provided at the screw shank 3. The downstream side and the upstream side of its screw groove are connected and communicated by the ball circulation grooves 33, 34 that return the ball 4 to the upstream side from the downstream side and circulates it in the screw groove. And the ball is arranged to the direction of rolling movement, which makes the constitution of a total ball type. COPYRIGHT: (C)2004,JPO
|
