The cylinder block is the main body of the engine. It connects each cylinder and the crankcase into a whole. It is a support frame for installing the piston, solar collector crankshaft, and other parts and accessories.

The tensioner pulley is a belt tensioning device used in the automobile transmission system. Tension Roller is mainly composed of a fixed shell, a tensioning arm, a wheel body, a torsion spring, a rolling bearing and a spring sleeve. Tension Roller can automatically adjust the tension according to the different tightness of the belt. The tight force makes the transmission system stable, safe and reliable.