The cylinder block (CylinderBlock) is the basic structure of the engine and an important part of the engine block group, between the cylinder head and the oil pan.

Strictly speaking, the cylinder block is called the cylinder block-the crankcase! Because the upper part is one or several cylinders, and the lower part is the crankcase supporting the crankshaft, the two parts are generally cast together, which we usually call the cylinder block for short.

According to the different installation plane positions of the cylinder block and the oil pan, it can be divided into three forms: general cylinder block, gantry cylinder block and tunnel type cylinder block. Considering its working conditions are high temperature and high pressure, and the piston reciprocates in it, the friction is great, so the cylinder block must be resistant to high temperature, corrosion and wear. Generally speaking, in order to meet the above requirements, the following measures can be taken: cylinder block material, machining accuracy, and structure.

In terms of cooling, the cylinder block is generally water-cooled or air-cooled. For example, the engine on our motorcycle is air-cooled. Generally, the car is mainly water-cooled, but it is also equipped with a fan to assist in cooling.