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AssigneesOhtama Co., Ltd., TODA RACING Co., Ltd.
InventorsMasaru Nakayama, Koji Kajitani
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During EMC testing of electric motors, a rotation transmission device that penetrates a wall in an electromagnetic anechoic chamber has been unable to achieve high rotation and high torque, because of the skipping rope phenomenon. In order to achieve rotation transmission at high rotation and high torque, a fiber-reinforced plastic shaft is supported by a bearing inside a conductive housing; and a conductive brush that obstructs a space between the housing and the shaft surface is provided so as to provide electrical conduction between the housing and the shaft and prevent radio wave leakage. A plurality of bearings could be used, excluding at both ends, in order to achieve rotation transmission at high rotation and high torque.
A rotation transmission device having a conductive rigid cylinder fixed on a surface table at its both ends, bearings provided at both ends parts of said conductive rigid cylinder and a shaft made of conductive fiber-reinforced plastic supported by the bearings, wherein the shaft length is 900 mm or longer, the rotation speed is possible at 16,000 revolutions per minute (r.p.m.) or more, and electromagnetic wave shielding is made by conductive resin fiber brushes which obstruct the space by being contact with the shaft periphery at both ends of the conductive rigid cylinder.
Dependencies are inferred from the claim text.