| 摘要 |
PROBLEM TO BE SOLVED: To provide a closed type motorized pulley which can ease limits of working temperature and continuous service time by suppressing a temperature rise inside motor casing by a simple structure. SOLUTION: A closed type motorized pulley 1, which provides a motor 20 inside a motor casing 10 formed by sealing both end opening sections of a drum 11, and rotates the drum 11 by transmitting a driving force of a rotary drive shaft 24 of the motor 20 to a gear mechanism 30, is characterized in that: an air introduction passage 55, which is arranged in interposition from electric supply machine side within the motor casing 10, is formed within the drum 11 by penetrating the inside of a fixed axis 50 in such a way that an air inlet 54 communicating with a through hole 52 is formed in the fixed axis 50 having the through hole 52 inserting an electric supply line 51; a compressed air supply means 60 for supplying compressed air inside the drum 11 is connected to the air inlet 54; and an air outlet 19 discharging the compressed air introduced inside is formed inside the drum 11. COPYRIGHT: (C)2009,JPO&INPIT
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