The aim of the article is to demonstrate the effect of setting the length of the upper link of the three-point hitch on the change in the load of the in-furrow wheel and the on-land wheel of the tractor during ploughing. Furthermore, attention is paid to the load on the rear wheels together with the tyre inflation pressure and their effect on the contact pressure under the tractor wheels. The tractor’s inclination, in combination with the force and moment effects of ploughing, may not always lead to large differences in the contact pressures of the rear in-furrow and on-land wheels. The results for the tractor-mounted plough set showed the possibilities of balancing the load on the rear wheels of the tractor when changing the length of the upper link of the three-point hitch. For semi-mounted ploughs, changing the length of the link will not affect the difference in the load on the rear wheels of the tractor. The kinematic linkage of the semi-mounted plough suspension transmits the moment from the plough support wheel and loads the wheel in the furrow more. The results further document that the proper suspension of the ploughs and, in particular, the appropriate choice of tyre inflation pressure can achieve substantial changes in the contact pressure under the rear wheels of a plough tractor.

本文旨在论证三点悬挂上连杆长度的设置对耕作过程中拖拉机犁沟轮和陆轮载荷变化的影响。此外，还要注意后轮上的负载以及轮胎充气压力及其对拖拉机车轮下接触压力的影响。拖拉机的倾斜与犁地的力和力矩效应相结合，可能并不总是导致后犁沟轮和陆上轮的接触压力存在很大差异。安装在拖拉机上的犁组的结果表明，当改变三点悬挂装置上连杆的长度时，可以平衡拖拉机后轮上的负载。对于半挂式犁，改变连杆的长度不会影响拖拉机后轮上的负载差异。半挂式犁悬架的运动连杆传递来自犁支撑轮的力矩，并在犁沟中加载更多的车轮。The results further document that the proper suspension of the ploughs and, in particular, the appropriate choice of tyre inflation pressure can achieve substantial changes in the contact pressure under the rear wheels of a plough tractor.