| 摘要 |
PROBLEM TO BE SOLVED: To provide a travel gear provided with a travel transmission basic system provided with similar revolving performance to a differential gear device without causing disadvantages concerning cost. SOLUTION: For right revolution, for example, a sun gear Z1R is rotated at a constant rotation speed as it is integrated with a drive shaft 4 similarly to that in advancing straight, but rotation speed of a carrier 20R is reduced to reduce rotation speed of a rotation gear Z4R in accordance with the tilting operation angle of a power steering lever 88. When the revolution outer side and inner side are rotated in the same direction, with revolution inside rotated at lower speed than on the outer side, slow revolution is made. When rotation speed of the carrier 20R is 1/3, for example (it is changeable in accordance with the gear ratio), of rotation speed of the sun gear Z1R, the rotation gear Z4R makes zero-rotation, and brake turn is made when rotation of an axle b on the revolution inner side is stopped. As rotation speed of the carrier 20R is reduced, the rotation gear Z4R is rotated inversely, and the revolution outer side and inner side are rotated inversely to each other to make a spin turn.
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