目前大型机器计备的强制循环润滑系统和液压系统,都广泛采用齿轮油泵供油。其优点是结构简单,易于维修,能获得较大范围的轮油量和输出压力。但在运行过程中油会沿传动轴向外渗漏,在零件(如轴、滚针等)磨损后漏油尤为严重。另外,如油泵的主要零部件未按要求进行渗碳、淬火及磨削加工,则漏油程度大为增加,从而造成机械油的大量浪费,且不利于生产。实践证明,采用油泵前盖内侧开回油线的办法能 At present, large-scale machines are equipped with forced circulation lubrication system and hydraulic system, which are widely used gear oil pump. Its advantages are simple structure, easy maintenance, can get a larger range of oil and output pressure. However, during operation, the oil will leak outwards along the transmission shaft. The oil leakage is especially serious after the parts (such as the shaft, the needle roller, etc.) wear out. In addition, if the main components of the pump are not carburizing, quenching and grinding as required, the degree of oil spill greatly increased, resulting in a large amount of waste of mechanical oil, and is not conducive to production. Practice has proved that the use of pump inside the back cover to open the oil line approach can