ROTATIONAL BODY AND METHOD FOR MANUFACTURING THE SAME

摘要

An object is to provide a rotational body in which a gap is not formed between a rotational shaft and an impeller even during rotation at high speed in the interference fit portion between the rotational shaft and the impeller, and in which misalignment between the center positions of the rotational shaft and the impeller does not arise, and a manufacturing method thereof. A rotational body 1 includes a rotational shaft 2, an impeller 3, and a nut 6. The impeller includes a hub portion 4 having a peripheral surface 4s inclined to the axial direction of the rotational shaft and having an insert hole 4h in which the rotational shaft is inserted, and a blade portion 5. At least one of the rotational shaft or the insert hole of the hub portion has an interference fit portion 10 for fit between the rotational shaft and the impeller, where the outside diameter of the rotational shaft is larger than the inside diameter of the insert hole of the hub portion. The interference fit portion is formed in a region which does not include the largest outside diameter portion 4B where the hub portion has a largest outside diameter, with the rotational shaft and the impeller mating with each other.

主权项

1. A rotational body comprising:
a rotational shaft; an impeller mating with the rotational shaft on an end side of the rotational shaft; and a nut screwed on the rotational shaft on an end side of the rotational shaft to fasten the rotational shaft and the impeller together, wherein the impeller includes a hub portion having a peripheral surface inclined to an axial direction of the rotational shaft and having an insert hole in which the rotational shaft is inserted, and a blade portion provided so as to protrude from the circumferential surface of the hub portion toward a radial direction, wherein at least one of the rotational shaft or the insert hole of the hub portion has formed an interference fit portion for fit between the impeller and the rotational shaft where an outside diameter of the rotational shaft is larger than an inside diameter of the insert hole of the hub portion, and wherein the interference fit portion is, in the axial direction of the rotational shaft, in a region which does not include a largest outside diameter portion where the hub portion has a largest outside diameter, with the rotational shaft and the impeller mating with each other.