What are the components of the piston connecting rod assembly?
2 Answers
The piston connecting rod assembly mainly consists of the piston, piston rings, piston pin, connecting rod, and connecting rod bearing shells. The piston connecting rod assembly converts the reciprocating motion of the piston into the rotational motion of the crankshaft, while transforming the force acting on the piston into the torque output by the crankshaft to drive the rotation of the car wheels. It serves as the transmission component of the engine, transferring the pressure of the combustion gases to the crankshaft, causing the crankshaft to rotate and output power. Additional information: 1. The function of the piston. The main function of the piston is to withstand the gas pressure in the cylinder and transmit this force to the connecting rod through the piston pin to drive the rotation of the crankshaft. It transfers the pressure of the combustion gases to the crankshaft, causing the crankshaft to rotate and output power. The top of the piston also forms the combustion chamber together with the cylinder head and cylinder wall. 2. The composition of the piston. The piston mainly consists of the top, head, and skirt. The shape of the piston top is related to the selected combustion chamber. Gasoline engine pistons generally have a flat top, which has the advantages of a small heat absorption area and simple manufacturing process. Some pistons use a concave top to alter the formation of the air-fuel mixture, and the size of the concave can also adjust the engine compression ratio.
As a long-time car mechanic, the piston connecting rod assembly mainly consists of several important components. The piston moves up and down inside the cylinder, responsible for compressing the air-fuel mixture and withstanding high temperature and pressure; the connecting rod links the piston to the crankshaft, converting the piston's linear motion into the crankshaft's rotational motion; the piston pin is fixed inside the piston, serving as the pivot point for the connecting rod; the piston rings include compression rings and oil rings—the compression rings ensure cylinder sealing to prevent gas leakage, while the oil rings scrape off excess oil and lubricate the cylinder walls. In actual repairs, common issues I encounter include piston ring wear leading to excessive oil consumption or a bent connecting rod causing engine knocking, often resulting from oil deficiency or high-temperature conditions. For maintenance, it's recommended to change the oil every 5,000 kilometers and avoid prolonged engine overload to prevent premature component damage. During inspections, pay attention to abnormal knocking sounds, which can help prevent major issues in time.
