球笼式等速万向节润滑脂的研制

Development on Ball Cage Type Constant Velocity Joint Grease

等速万向节(CVJ)是连接变速箱与车轮之间的重要传动部件,是动力的直接传递单元。随着汽车向高速,高扭矩,大功率和小型化方向发展,传递功率增加,CVJ的接触应力也随之增加。如果CVJ在汽车行驶过程中得不到充分的润滑,滚动体和内外滚道都有可能发生擦伤,严重时将直接危及到汽车的行车安全。根据球笼式CVJ的运行工况,对球笼式CVJ润滑脂进行了研制。球笼式CVJ润滑脂由混合脂肪酸(12-羟基硬脂酸∶硬脂酸=8∶2)锂皂稠化半合成油(PAO+精制矿物油),并添加6.5%的复合抗磨极压剂(2.5%MoS2+0.5%石墨+3.0%磺酸盐+0.5%硫化脂肪)组成,具有良好的抗磨损性能和较低的摩擦因数,并且通过了600次循环的耐久性台架试验,可满足中高排量乘用车球笼式CVJ的润滑要求。

Constant velocity joint(CVJ)was an important transmission component between the gearbox and the wheel,which was the direct transmission unit of power.With the development of high speed,high torque,high power and miniaturization of automobile,the contact stress of CVJ increased with the increase of transmission power.If CVJ could not get enough lubrication in driving,the roller and inner and outer raceway might be abraded,which would directly endanger the safety of the automobile.According to the operating conditions of ball cage type CVJ,ball cage type CVJ grease was developed.Ball cage type CVJ grease was composed of mixed fatty acid(12-hydroxystearic acid∶stearic acid=8∶2)lithium soap thickened semi-synthetic Stock(PAO+refined mineral oil),and 6.5%complex anti-wear and extreme pressure additive(2.5%MoS2+0.5%graphite+3.0%sulfonate+0.5%sulfurized fat).It had good anti-wear performance and lower friction coefficient,and had passed the durability bench test of 600 cycles,which could meet the lubrication requirements of ball cage type CVJ for medium and high displacement passenger cars.