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我县有两台东方红-75型拖拉机大修出厂后,在保修期内相继发生了水泵壳体折断,引起风扇皮带轮将水箱打坏的事故。两台车同是由于水泵壳体折断打坏水箱,但起因不一样。第一台车水泵壳体折断的原因是水泵壳体原有的旧裂纹不断扩大所引起的。第二台车水泵壳体折断的原因是由于风扇掉了一个叶片,风扇失去了平衡,不断变化方向的离心力使水泵壳体疲劳所引起的;而风扇叶片之
My county has two Oriental Red -75 tractor overhaul factory, in the warranty period have occurred in the pump casing break, causing the fan pulley accident damage to the water tank. Both cars are broken due to the pump casing broken tank, but the reason is not the same. The first trolley pump casing breakage is due to the original pump housing cracks caused by the original expansion. The second car shell water pump broken because the fan out of a blade, the fan loses its balance, the changing direction of centrifugal force caused by the pump housing fatigue caused; and the fan blades