| 摘要 |
PURPOSE:To provide a gear easy to manufacture having a simple structure and strong and stable torque transmission by coaxially disposing plural pairs of magnetic gears with the magnetic engagement position of a pair of the magnetic gears being successively shifted. CONSTITUTION:A driving side gear 10 has six tooth surfaces 11 and six magnetic poles disposed, and a driven side gear 14 having eight tooth surfaces 15 has eight magnetic poles disposed, whereby the reduction gear ratio is set 1:1.3. A pair of magnetic gear 1 formed of the driving side gear 10 and the driven side gear 14 and a magnetic gear 2 having quite the same constitution are coaxially disposed with the magnetic engagement position being shifted by 1/2 pitch. In the magnetic engagement between the gears 10 and 14, as permanent magnets 12, 16 are disposed with the same poles upside, the same poles oppose and magnetically repel each other, and the gear 14 is rotated in the opposite direction by the rotation of the gear 10 and torque transmitted. In this case, each magnetic gear 2 having the same constitution coaxially disposed on the driving side shaft 13 and the driven side shaft 17 of the gear 1 makes the same action. Therefore, the cavity between magnets is not changed in spite of load fluctuation, and torque transmission is highly stabilized. |
