关键词: 正时系统；张紧器；泄漏间隙；柱塞位移；动态试验

Abstract: In order to make the best setup for the timing system, three kinds of hydraulic timing tensioner project with different leakage gaps were designed for the engine, and the dynamic test of the timing system was carried out for every project. Some characteristic parameters of the timing tensioner were tested under different speeds, and these results were analyzed. The results show that the maximum oil pressure values in the high pressure chamber of the three timing tensioners are less than 50 bar, meeting the design requirements. The oil pressure value in the high pressure chamber of the maximum leakage gap project is the minimum among the three projects. Different oil temperature has little effect on the oil pressure of high pressure chamber. Piston motion values are all less than 4.7 mm, and the value of the maximum leakage gap project is the smallest. Therefore, the engine finally chooses to use the timing tensioner with the largest leakage gap value. The test method can measure the dynamic behaviour of engine timing system and provide technical support for the design of timing tensioner.

Key words: Timing system; Tensioner; Leakage gap; Piston motion; Dynamic test