手动变速箱油同步耐久性试验前后摩擦学性能变化

CHANGES OF TRIBOLOGICAL PROPERTIES OF MANUAL TRANSMISSION FLUID BEFORE AND AFTER SYNCHRONOUS DURABILITY TEST

采用MRS-1J四球摩擦试验机、SRV摩擦磨损试验机和EHD2油膜厚度测定仪等考察两种手动变速箱油在SSP180同步耐久性试验前后理化性能和摩擦学性能的变化。结果表明:试验前后油品理化性能基本无变化;能通过SSP180同步耐久性台架试验(循环10万次)的油品试验前后的四球摩擦因数平稳保持在0.10左右、SRV摩擦因数平稳保持在0.14左右,最大无卡咬负荷、四球磨斑直径、SRV水平、垂直和平均磨斑直径无明显变化,同步耐久性试验后的油品油膜厚度随着试验速度的增大保持性较好;不能通过SSP180同步耐久性台架试验的油品,在同步耐久性试验后的四球摩擦因数和SRV摩擦因数与试验前相比均有所下降,随着试验时间由10 min延长到120 min,试验前后油品SRV摩擦因数分别从0.16降至0.09、0.15降至0.07。油膜的稳定性、摩擦因数的大小和稳定是影响油品能否通过SSP180变速箱同步耐久性试验的重要因素。

The changes of physical and chemical tribological properties of two kinds of manual transmission oils before and after SSP180 synchronous durability test were evaluated by MRS-1J four-ball tester,SRV testing machine and EHD2 oil film thickness tester.The results indicated that the physcochemical properties of the sampes were basically unchanged before and after the test.The four-ball friction coefficient of the oils that can pass SSP180 synchronous durability bench test(100000 cycles)was kept at about 0.10,the SRV friction coefficient was kept at about 0.14,the maximum non seizing load,the four-ball mill spot diameter,the SRV horizontal,vertical,and average wear spot diameter had no obvious changes.The oil film thickness after durability test kept well with the increase of test speed.The four-ball friction coefficient and SRV friction coefficient of the oils that could not pass the SSP180 synchronous durability bench test decreased after the synchronous durability test and before the test.With the extension of the test time,the SRV friction coefficient of the two samples before and after the test decreased from 0.16 to 0.09 and 0.15 to 0.07,respectively.The stability of oil film,the size and stability of friction coefficient were the important factors that affect whether the oil could pass the ssp180 transmission synchronous durability test.