What is the function of a piston pin?
2 Answers
The function of the piston pin is to connect the piston and the connecting rod, enabling swinging motion, and it plays a role in transmitting force and data as well as providing connection. The piston pin is made of low-carbon steel or low-carbon alloy steel. For engines below 150 horsepower, materials such as 15, 20, 15Cr, 20Cr, and 20Mn2 steel are used. For engines above 150 horsepower, materials like CrNi3A, 18CrMnTi2, and 20SiMnVB are employed. The fixing methods for piston pins include: 1. Using a floating pin, which can rotate in both the piston pin seat and the small end of the connecting rod; 2. Fixing the piston pin on the piston pin seat, allowing it to rotate in the small end of the connecting rod; 3. Fixing the piston pin on the small end of the connecting rod, enabling it to rotate in the piston pin seat.
The piston pin is a crucial small component in the engine, and I've often seen it in action during my car repair experience. It primarily connects the piston and the connecting rod, allowing the piston's up-and-down motion to drive the crankshaft's rotation, thereby enabling the engine to operate. Without it, the entire system would be loose, and power couldn't be transmitted to move the car. In terms of design, it must withstand high temperatures and pressures, typically made from reinforced steel to prevent premature wear. I've worked with piston pins from different vehicle models and found that older cars are prone to issues like looseness and abnormal noises—once the gap is too large upon inspection, it needs replacement. I recommend regular engine maintenance to check the piston pin's condition. Neglecting this little component could lead to more severe failures, such as cylinder scoring, which is costly and troublesome. This part may seem low-key but is critically vital.
