SRV-Ⅳ摩擦试验机与WS2001变速箱同步器台架对手动变速箱油同步器适应性评定相关性研究

COMPARATIVE STUDY OF SUITABILITY OF MANUAL TRANSMISSION OILS FOR SYNCHRONIZER BY SRV-Ⅳ TEST AND WS2001 BENCH TEST

为节约试验成本和台架试验前对油品进行初步筛选,利用SRV-Ⅳ摩擦磨损试验机与WS2001变速箱同步器台架考察了手动变速箱油与同步器适应性,并探讨了两种评价方法间的相关性。试验结果表明:试验油的SRV-Ⅳ摩擦因数大小及变化趋势、磨痕与WS2001变速箱同步器台架摩擦因数大小及变化趋势、磨损情况之间有对应关系,而与WS2001同步换挡寿命的关系不明显;通过试验油在SRV-Ⅳ摩擦磨损试验机上的表现可对其在WS2001变速箱同步器台架的运行情况和失效形式做出判断。ASTM D6425法和变频法测得SRV-Ⅳ摩擦因数大于0.131,且后期保持稳定或上升趋势的油品,WS2001台架的摩擦因数也较高且运行稳定;摩擦因数初值大于0.110,但随频率增大而迅速下降到0.090附近的油品,WS2001变速箱同步器台架前期运行平稳,但后期易出现打齿现象。SRV-Ⅳ磨痕面积大于1.394mm2,磨斑深度在4.43μm以上,表现明显犁沟现象的油品,易引起同步器磨损失效。

To save the cost of screening the oil, the suitability of manual transmission oils for syn- chronizer were investigated by SRV-IV testing machine and WS2001 synchronizer bench test. The correlation of the two methods was also discussed. The experimental results indicate that （i） the friction co- efficient and the change trend, the wear scar of SRV-Ⅳ were correspondence with WS2001 synchronizer bench test, but not obviously related with WS2001 service life; （ii） The running status and failure mode of manual transmission oils on WS2001 test can be preliminary anticipated by the performance of oil on SRV-Ⅳ testing machine. The oil with high SRV-Ⅳ friction coefficient （〉0. 131） and high stability in long-running, measured by ASTM D6425 and variable-frequency method, has a good running stability and a high stable friction coefficient on the WS2001 test as well. While the oils tested by WS2001 synchronizer was stable in the early stage with friction coefficient higher than 0. 110 and then rapidly reduced to 0. 090, the damaged gear occurs. The oils that the wear scar is larger than 1. 394 mm2 and 4.43 μm in depth after SRV-Ⅳ test easily cause the wear failure of the WS2001 synchronizer.