一个时期以来,装在“天津大发”微型汽车上的370Q型汽油机,曾经出现过十几起因正时齿形带错位,使发动机损坏的大事故,损坏程度比较严重。分析其原因,一种情况是由于正时齿形带装配方法不正确,另一种情况是配气机构转动阻力过大,正时齿形带的传动力克服不了所造成的。本文就这些问题作一简要介绍。 Since a period of time, the 370Q-type gasoline engine mounted on the “Tianjin Daihatsu” mini-car has seen more than a dozen major accidents resulting from the timing belt being misplaced and damaging the engine, resulting in serious damage. Analysis of the reasons, one is due to the timing toothed belt assembly method is not correct, the other case is the valve body rotation resistance is too large, the timing belt can not overcome the transmission caused. This article gives a brief introduction to these issues.