| 摘要 |
PURPOSE:To surely obtain a differential gear in a low price with light weight, by providing differential pulleys, which turn around the periphery of the differential pulley, rotatably mounted to a rotary axle of a driving wheel, by a driving mechanism crossing at a right angle with the mechanism, and connecting the pulleys by an endless belt. CONSTITUTION:If an output wheel 7 rotates in any of normal or reverse directions, a belt 6 turns rotating a driving wheel 1 in any of normal or reverse directions. Here a differential pulley 4 is rotatably supported to a block 16 integrally rotating around an axle with the driving wheel 1, accordingly right and left differential pulleys 3, 3 are rotated an equal speed through an endless belt 5. And when either one of the axles 2 is necessary to rotate faster than the other, that is, when a speed difference is generated between inner and outer wheels, the axle 2 in the inner ring side revolves on its own axis in a reverse direction to the direction of rotation of the axle 2 in the outer wheel side through the endless belt 5. That is, by generating a racing phenomenon between the axle 2 in the inner wheel side and the driving wheel 1, rotary torque is prevented from acting on the inner wheel. Thereupon, rotating the inner wheel slower in accordance with a speed of the outer wheel, causes a speed difference between the inner and outer wheels to be accurately absorbed.
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