【摘要】 采用复式行星轮系设计出一种适应性强的指南车。其特点是：不论双轮着陆，还是单轮着陆，均可实现固定的指南方向。更多还原

【Abstract】 A New design of compass cart by making use of the compound planetary gear train is presented. The characterstic of this compass cart is that it points to the north direction fixedly either when only one wheel contacts the ground, or when the two wheels touch down.更多还原