The connecting rod connects the piston to the crankshaft. It can rotate at both ends so that its angle can change as the piston moves and the crankshaft rotates.

• 连杆把活塞和曲轴连接起来。连杆的两端都可以旋转，因此在活塞运动、曲轴旋转时，连杆的角度可以任意调节。