| 摘要 |
PROBLEM TO BE SOLVED: To provide the connecting structure of a revolving shaft in connecting strength to a coupling and easiness of manufacture for the revolving shaft. SOLUTION: In a ball screw shaft 25, a bearing engaging part 55 and a connecting part 47 are formed with the same diameter; a screw hole 63 screwed in a hexagonally holed bolt 61 is formed in the shaft center of the connecting part 47. The coupling 23 consists of a front fastening part 71 for engaging into the ball screw shaft 25, a rear fastening part 73 for engaging into a driving shaft 41, a cylindrical elastic ring 75 fixed and provided between both the fastening parts 71, 73 by means of vulcanizing adhesion, etc. The front fastening part 71 is of a cylindrical shape having a revolving shaft holding hole 72 in the shaft center and forms a stepped part 79 fixing a washer 77 to its rear end, and a set screw hole 81 penetrated to the inner boundary face from the outer boundary face. A bearing 51 is held in a rear bearing housing 31. Its inner ring 53 is externally engaged with the bearing engaging part 55 of the ball screw shaft 25. A spacer 57 is placed on the inner ring 53 at its rear part. The spacer 57 at its rear end is abutted to the coupling 23 at its front fastening part 71. |
