Abstract:In order to set up an evaluation method for the frictional characteristics of lubrication oils that adapts to the structure characteristic of transmission gearbox in the common heavy duty vehicle and the requirement of lubrication oil selection and use,the WS2001 synchronizer bench was designed,by selecting a representational WS2001 transmission gearbox for the heavy duty vehicle.For studying the influence of transmission oils on the performance of a synchronizer,combined with technical characteristics and status in practical application of the heavy duty vehicle,and referenced to the standard methods,such as SH/T 07562005,CEC L6699,the test method of frictional characteristics was established for the synchronizer test bench.The experimental results of the referencing oil show that the built test bench can satisfy evaluation work of lubricant frictional characteristics of the transmission gearbox,and the evaluation method is reliable and has very good repeatability and discrimination.