Hitachi, Ltd.

Kunio Ishii

Takashi Yasuhara

Hideaki Kobayashi

Yasuharu Tamuro

A rotary electrical machine connected to a rotary machine heated to high-temperature, such as a heater roll used for processing fibers, a ventilation fan for ventilating a high-temperature furnace, etc., includes a rotary shaft journaled by bearing means of the rotary electrical machine including a first member formed of material of low thermal conductivity for supporting a rotor, and a second member formed of material of high hardness constituting an output end portion of the rotary shaft remote from the bearing means. The first member and the second member are united together in a position located opposite the rotor with respect to the bearing means and spaced apart from the bearing means. Cooling means, such as a heat dissipating fan, heat dissipating fins, etc., is mounted on a portion of the rotary shaft between the vicinity of the joint of the two members and the bearing means. By this arrangement, a rise in the temperature of the bearing means of the rotary electrical machine can be avoided when the machine is connected to a rotary member of high-temperature, and the rotary member can be connected and disconnected readily and positively.

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Sakura, Japan

Kunio Ishii