手扶拖拉机以不同的耕耘档次(高、低档)和行走档次(Ⅰ、Ⅱ档)相配合,在麦茬地和已耕地上进行旋耕试验表明:(一)旋耕作业时,有周期性的冲击负荷。在麦茬地上满负荷工作时,旋转锄中间轴和发动机曲轴扭矩变化频率为22波/秒,曲轴扭矩最大值为平均值3倍多,为台架试验时(n_c=1540转/分时,M_(emax)=3.7公斤·米)的1.5～1.7倍,旋转锄中间轴扭矩最大值约为平均值的1.9倍。在已耕地上,负荷 Walking tractors with different grades (high and low) and walking grade (Ⅰ, Ⅱ files), the stubble on the wheat fields and cultivated land rotation tests showed that: (a) rotary tillage operations, there are periodic Impact load. When working at full capacity on the stubble field, the torque of the rotating hoe intermediate shaft and the crankshaft of the rotating hoe changes at a frequency of 22 waves / second and the maximum value of the crankshaft torque is more than 3 times the average value. For the test of the bench (n_c = 1540 rpm, M_ (emax) = 3.7 kg · m). The maximum torque of the rotating hoe intermediate shaft is about 1.9 times of the average value. In the arable land, the load