1 前言 支重轮是J-50拖拉机行走部分的重要易损零件之一。经过多年的伐区和修理厂调查,发现其早期失效的主要形式是:(1)支重轮在轮缘与轮网的交角处(以下简称根部)产生断裂;(2)支重轮轮缘在靠近根部或相距根部不同距离处产生断裂。(3)轮缘断裂后,产生局部或全部脱落。 1 Introduction Rollers are one of the most important wearing parts for the J-50 tractor’s walking section. After many years of investigation of cutting areas and repair shops, it was found that the main forms of early failure were: (1) The support rollers were broken at the corner between the rim and the wheel network (hereinafter referred to as the root); (2) Fractures are generated near the root or at different distances from the root. (3) After the rim breaks, partial or complete shedding occurs.