| 摘要 |
PROBLEM TO BE SOLVED: To provide an actuator capable of maintaining a level of the lubricating oil inside a lubrication space in drive and capable of discharging a sufficient quantity of the lubricating oil at stop without increasing the machining man-hours. SOLUTION: A lubricating oil discharge passage for discharging lubricating oil from a lubrication space inside an actuator is formed of groove parts 20e and 20f in a notch part of a spline 20b on a shaft support part 18 side. With such a structure, the lubricating oil discharge passage can be formed without requiring a special machining process, and the lubricating oil discharge passage can sufficiently adjust discharge of the lubricating oil can be secured. A flow passage area of the upper groove 20e in the gravity direction is formed larger than a flow passage area of the lower groove 20f. With this structure, lubricating oil inside the actuator can be sufficiently discharged at the same level as the upper groove 20f in drive, and sufficient lubrication is enabled. In a stop of drive, since the lubricating oil is discharged to the same level as the lower groove 20f, starting in cold is not difficult. COPYRIGHT: (C)2010,JPO&INPIT |
