Wrist Pin

Wrist Pin

• Function: The wrist pin serves as a pivot point between the piston and the connecting rod in an internal combustion engine. It allows the piston to move up and down within the cylinder bore while transmitting force from the piston to the connecting rod, and ultimately to the crankshaft.
• Design: Wrist pins are typically made of steel and are cylindrical in shape. They can be solid or hollow, depending on the engine design and performance requirements. Hollow wrist pins are often used in high-performance engines to reduce weight and improve engine response.
• Installation: The wrist pin is inserted through the piston and connects the small end of the connecting rod to the piston. It is secured in place with retaining clips or circlips to prevent lateral movement during engine operation.
• Importance: The wrist pin must withstand significant forces and high temperatures during engine operation. It needs to be precisely machined and properly lubricated to ensure smooth movement and to prevent premature wear or failure.
• Alternative Names: The wrist pin is known by various names, including “piston pin” and “gudgeon pin.” The term “floating piston pin” refers to a design where the wrist pin is allowed some degree of lateral movement within the piston and connecting rod to accommodate thermal expansion and reduce piston noise.

In summary, the wrist pin is a vital component of an internal combustion engine, facilitating the connection between the piston and the connecting rod while allowing for smooth and reliable engine operation.