邢台—120基本型小四轮拖拉机,由于轮距较窄,不能满足某些地区特别是东北垄作的要求。为进一步扩大拖拉机的使用范围,适合不同地区多种作业的农艺要求,邢台拖拉机厂在基本型的基础上改进设计了宽轮距邢台-120型小四轮拖拉机。宽轮距小四轮的前轮距由基本型的820毫米增大到1250毫米,后轮距由850毫米增大到1300毫米,在东北地区可以跨两垄耕作。前轮距的加大是通过加长前轴管实现的,后置式转向梯形的其它参数也相应有所变化,否则,导向轮偏转角平均相对误差达到11.2%,将导致前轮胎的加速磨损。通过优化设计,转向梯形的参数进行了如下 Xingtai -120 basic small four-wheel tractor, due to the narrow track, can not meet the requirements of some areas, especially the Northeast ridge. To further expand the use of tractors, suitable for a variety of operations in different regions of agronomic requirements, Xingtai tractor plant in the basic type based on the improved design of a wide wheel from Xingtai -120 small four-wheel tractor. Wide wheelbase The front wheelbase of the smaller four wheels increases from the basic 820 mm to 1250 mm and the rear wheelbase increases from 850 mm to 1300 mm. In the northeastern region, it can cross two ridges. The increase of the front track is realized by lengthening the front axle tube. Other parameters of the rear trapezoidal trapezoid also change accordingly. Otherwise, the average relative error of the deflection angle of the guide wheel will reach 11.2%, which will lead to accelerated wear of the front tire. By optimizing the design, the steering trapezoidal parameters are as follows