| 摘要 |
PROBLEM TO BE SOLVED: To easily mount or demount to the rotary shaft and remove clattering between a rotary shaft and a rotary body during use thereof or the rotation of the rotary body. SOLUTION: The structure is provided with a rotary shaft fixedly arranged at one end side and a rotary body having an opening in which the rotary shaft is inserted and rotatably arranged around the rotary shaft. An expansive member with a large thermal expansion coefficient is provided on the outer peripheral face of the rotary shaft or on the inside face of the opening of the rotary body. The shape of the opening of the rotary shaft or the rotary body is shaped to get thin toward the longitudinal free end side of the rotary shaft and an urging means is provided to urge the rotary body to the fixing end side in the axial direction of the rotary body when the rotary body is driven. And further, a clearance adjusting member adjusting the clearance between the outer periphery of the rotary shaft and the inside face of the opening in accordance with the centrifugal force of the rotary body in driving the rotary body is provided at the inside face of the opening of the rotary body. |
