Motor fan retention on a non-stepped shaft

DETAILED DESCRIPTION Among the several objects of the present invention may be noted the improvement of a generally uniform diameter shaft for installation in a motor assembly, and a ventilating fan mountable on the shaft in a way that requires less working of the motor shaft; the provision of such improvement in which the fan is readily installable with the rotor during motor assembly; the provision of such improvement in which the fan is retained on the shaft even when the shaft is rotating at speed; and, the provision of such improvement which lowers motor cost, improves a readily automated method of locating and maintaining a fan on a motor, and permits the use of smaller diameter shafts thereby reducing material cost for a motor.
In accordance with this invention, generally stated, a dynamoelectric machine comprises a housing, a stator assembly, and a rotor assembly including a rotatable generally single diameter shaft.
The shaft projects through an opening in an end wall or endshields of the motor.
An improvement comprises a fan for moving air through the machine to ventilate it and keep it cool.
Simplified, low cost means are provided for securing the fan to the end of the non-stepped shaft extending through the opening and for maintaining it there when the motor is operating at its normal speed.
Other objects and features will be in part apparent and in part pointed hereinafter.