Patent attributes
A fan for generating an air flow by rotating an impeller with a motor is provided. A cylindrical outer side surface of a rotor of the motor is press-fitted to an inner side surface of the impeller cup which is substantially cylindrical. An outer side surface of the impeller cup is a portion of a circular conical surface, thereby increasing the amount of air generated and transmitted by the fan. A gap is formed between the outer side surface and the inner cylindrical surface of the impeller cup. The cylindrical outer side surface of the rotor is connected to the inside of the inner cylindrical surface of the impeller cup coaxially with each other. Thus, the impeller and the rotor can be reliably fixed to each other with improved performance of transmitting air.
