利用微型牵引力试验机评价发动机油及添加剂的摩擦性能

在合适的试验条件下，采用微型牵引力试验机（MTM）可测量润滑油及添加剂在弹性流体润滑区、混合润滑区和边界润滑区的摩擦特性，并具有良好的区分性。几种添加剂在 MTM 试验机上的摩擦特性试验结果表明：在全配方发动机油中，不同辅助抗磨剂对 ZDDP的 抗磨性能有较大影响；在边界润滑区结晶型磺酸盐可有效降低摩擦系数，而在弹性流体润滑区和混合润滑区则对摩擦性能的改善无明显效果；不同摩擦改进剂的摩擦性能及其作用范围也不尽相同，在实际使用中需要加以平衡。

STUDY ON FRICTIONAL BEHAVIOR OF ENGINE OIL AND ADDITIVES BY MINI-TRACTION MACHINE

Mini-traction machine is an effective tool to evaluate the frictional behavior of lubricants and additives in elastohydrodynamic lubrication (EHL), mixed lubrication (ML) and boundary lubrication (BL) with appropriate testing conditions. The device also has an excellent ability to differentiate various lubricants and additives. Frictional behaviors of several additives were studied by MTM tester. Test results show that anti-wear property of ZDDP can be much affected by diverse anti-wear additives in fully formulated engine oil. Crystalline sulfonate is sufficiently helpful to reduce the coefficient of traction under BL condition, while it doesn’t show any improvement on the coefficient of traction in EHL and ML lubrications. The frictional properties and effective range of various friction modifiers also have much difference and need to be carefully balanced in practical use.