What are the components of the piston connecting rod assembly?
3 Answers
Piston connecting rod assembly mainly consists of piston, piston ring, piston pin, connecting rod and connecting rod bearing, etc. The following is a detailed introduction of the piston connecting rod assembly: 1. The piston connecting rod assembly converts the reciprocating motion of the piston into the rotational motion of the crankshaft, and at the same time converts the force acting on the piston into the output torque of the crankshaft to drive the rotation of the car wheels. 2. The piston connecting rod assembly is the transmission part of the engine, which transmits the pressure of the combustion gas to the crankshaft, causing the crankshaft to rotate and output power. 3. Common failures of the piston connecting rod assembly: due to lack of oil, the connecting rod bearing is damaged, the piston hits the cylinder, the top cylinder is damaged, the connecting rod crankshaft is damaged, the piston ring is broken, the piston clearance is large, etc.
Having worked in the auto repair industry for so long, I've personally disassembled and installed numerous piston connecting rod assemblies. They typically consist of several core components: the piston body moves up and down in the cylinder, driven by combustion force; piston rings are fixed around the piston and divided into compression rings and oil rings - compression rings seal to prevent gas leakage while oil rings control oil scraping to remove excess grease; then there's the piston pin, which serves as a shaft connecting the piston to the small end of the connecting rod; the connecting rod consists of the rod body and rod cap, secured by bolts; additionally, connecting rod bearing shells are embedded in the big end of the connecting rod to reduce friction with the crankshaft. I've handled multiple failures, such as cases where worn piston rings caused oil to enter the combustion chamber and burn oil, or knocking noises caused by loose connecting rod bolts. For routine maintenance, I recommend checking engine operation every oil change - if there are abnormal noises or a sudden increase in fuel consumption, take it to a professional shop immediately. These small details can prevent major overhauls or even engine failure.
During my automotive studies, the instructor explained the piston-connecting rod assembly in detail, and I still remember it clearly. It mainly consists of the piston, piston rings (including two to three rings with different functions: compression rings seal the cylinder, oil rings maintain lubrication), the piston pin for connection, the connecting rod itself (small end connects to the piston pin, big end connects to the crankshaft), connecting rod cap, connecting rod bearings, and fixing bolts. In practical operations, such as assembly practice, bearings need to be properly lubricated, and bolt torque must be precisely measured; incorrect installation can easily cause connecting rod bending, leading to engine noise and vibration in mild cases, or even crankshaft damage in severe cases. When repairing my own car, I used this knowledge to identify a loose piston pin issue and addressed it in time to prevent more significant failures. I recommend that novice car owners develop the habit of reading the maintenance manual to ensure regular servicing of these components, improving power efficiency and engine longevity.
