船用柴油机分高速、中速和低速三类。高、中速柴油机采用的轴瓦材料多为铅青铜、铜铅合金和铝锡合金。低速柴油机绝大多数为白合金。我国船用柴油机轴瓦和国外先进水平相比,品种少、质量低和使用寿命短。低速大型船用柴油机中存在的最大问题是十字头轴瓦发生疲劳裂纹、剥落、铺铅等。使用寿命短,有的只有一千多小时。我国采用滚压的方法,提高十字头轴颈硬度和光洁度,以延长其使用寿命,情况有了一定的改善。但疲劳裂纹仍然存在,使用寿命不长的问题没有 Marine diesel engine points high speed, medium speed and low speed three categories. High, medium-speed diesel engine bearings used in materials mostly lead bronze, copper-lead alloy and aluminum-tin alloy. The vast majority of low-speed diesel white metal. China’s marine diesel engine bearings and foreign advanced level compared to less variety, low quality and short life. Large-scale low-speed large-scale marine diesel engine exists in the biggest problem is the cross-bearing fatigue cracks, peeling, shop lead and so on. Short life, and some only more than one thousand hours. China’s rolling method to improve the crosshead hardness and finish, to extend its service life, the situation has been a certain improvement. But fatigue cracks still exist, the problem of not long service life