| 摘要 |
A clutch system for a motor driven telescopic antenna, a first rotor provided on a main shaft for moving an antenna drive cord of a telescopically adjustable antenna, a second rotor fitted over the main shaft and rotated by an electric motor, first and second clutch discs which are inserted over the main shaft and kept pressed in the shaft direction by a clamp in order to press hold both end surfaces of the second rotor in between by applying a pressurizing force to the second rotor. The clutch system further includes a clutch pressure setter for dissociating the first and second clutch discs from the second rotor when the force exceeding a specified clutch pressure that is set in relation to the engagement with the main shaft acts on the holding surfaces between the second rotor and the first and second clutch discs. The clutch pressure setter includes first uneven portions formed on both end surfaces, in the shaft direction, of a ring-form member that is coaxially inserted over the main shaft and on the center side of the second rotor and second uneven portions formed in the first and second clutch discs corresponding to the first uneven portions of the ring-form member.
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