What are the types of valve trains?
1 Answers
According to the different installation positions of the valves, the valve train can be divided into overhead valve train and side valve train. The following is a detailed introduction about the valve train structure: 1. When the valves are located on the cylinder head, it is called an overhead valve train, which consists of cam, tappet, push rod, rocker arm, valve and valve spring, etc. Its characteristics are small intake resistance, compact combustion chamber structure, large airflow disturbance, and the ability to achieve a high compression ratio. Currently, domestic automobile engines all adopt the overhead valve train. 2. When the valves are located on the side of the cylinder block, it is called a side valve train, which consists of cam, tappet, valve and valve spring, etc. It eliminates parts such as push rods and rocker arms, simplifying the structure. Because its intake and exhaust valves are on one side of the cylinder, the compression ratio is limited, and the intake and exhaust resistance is large. The power and high-speed performance of the engine are relatively poor, and it has been gradually phased out.