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有一东方红-28拖拉机,因一连几次烧二缸连杆瓦未找到原因,使误认为曲轴有问题,于是就换了一根新曲轴。新换的轴瓦间隙合乎标准,但工作不久,二缸连杆瓦又烧了。原因何在?东方红-28拖拉机机油泵泵出的油到达机油滤清器后,其中一部分进入主油道,另一部分流回油底壳。进入主油道的机油又分为两路,其中大部分通过曲轴前端弯油管进入油管套环(止推垫圈),流入前主轴颈中孔去润滑第一,二缸连杆瓦。但由于润滑顺序不同(先一缸、后二缸),
There is an Oriental Red -28 tractor, because a few consecutive burning two cylinder rod watts did not find the reason to mistakenly think there is a problem with the crankshaft, so it replaced a new crankshaft. The new bearing gap to meet the standards, but work soon, two cylinder rod and burned again. The reason? Dongfanghong-28 tractor oil pump Pump oil to reach the oil filter, the part of the main oil into the channel, the other part of the flow back to the oil pan. The oil entering the main gallery is divided into two sections. Most of the oil enters the tubing collar (thrust washer) through the elbow of the crankshaft and flows into the middle main hole of the main journal to lubricate the first and second cylinder connecting rods. However, due to the different lubrication sequence (first cylinder, after two cylinders)