| 摘要 |
a conical main transducer(3) having the internal surface(3a) with which a material having high friction coefficients is covered, and rotated by a rotating force of an input shaft; a conical sub-transducer(5) having the external surface with which a material having high friction coefficients is covered to be contacted with the internal surface(3a) of the main transducer(3); a bevel gear assembly(4') coupled on the end of an internal rotary shaft(8) of the sub-transducer(5) and the end of a forward transmission shaft(6); a bevel gear case(20) in which the sub-transducer(5) and the bevel gear assembly(4') are installed and having a case slider(21) formed on the lower side thereof; the forward transmission shaft(6) comprised of a spline(29) and a spline boss(29') which are slided to move a sub-transducer assembly where the sub-transducer(5) and the bevel gear case(20) are contained within the interior of the main transducer(3); and a shift lever for moving the sub-transducer assembly in every direction.
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