| 摘要 |
There is provided a structure for joining an impeller to a rotatable shaft, including (a) a bush through which the impeller is joined to the rotatable shaft, the bush including a hollow cylindrical portion which is to fit into a recess formed with the impeller and into which the rotatable shaft is to fit, (b) a first joint structure for joining the bush to the impeller so that the bush is positioned coaxially with the impeller, and (c) a second joint structure for joining the rotatable shaft to the bush so that the rotatable shaft is positioned coaxially with the bush. The structure provides a sufficient ability for transferring a torque between an impeller and a shaft, self-align performance between an impeller and a shaft, and good serviceability for assembling and disassembling, and further provides higher accuracy in axially positioning an impeller and a shaft and lower fabrication costs. <IMAGE> |
