正时链条连接发动机缸盖与曲轴的正时轮,配合一定的传动比来保证进、排气时间的准确。要知道正时链条的用处,首先需了解发动机的工作过程。发动机的工作过程主要包含4个步骤:进气、压缩、做功和排气。虽然看起来简单,但实际上发动机的工作过程极为复杂,每个步骤都要与活塞、气门的运动状态和位置相配合,使进气与排气及活塞升降相互协调起来。而正时链条在发动机里面就扮演了一 Timing chain connecting the engine cylinder head and crankshaft timing wheel, with a certain transmission ratio to ensure that the intake and exhaust time accurately. To know the use of timing chain, we must first understand the working process of the engine. The working process of the engine mainly includes four steps: intake, compression, work and exhaust. Although it seems simple, but in fact the engine’s work process is extremely complex, each step must be with the piston, valve movement and position to match, so that intake and exhaust and piston lift coordinated with each other. The timing chain in the engine which played a