I believe a gudgeon pin is what the British call a connecting rod pin (or wrist pin or piston pin) in a reciprocating assembly, (piston, connecting rod, crank ) It connects the piston head to the connecting rod.
Gudgeon Pin/Piston Pin
The piston pin, also known as the wrist pin, serves to connect the piston to the connecting rod in an internal combustion engine. It allows for rotational movement of the connecting rod while enabling the piston to move up and down within the cylinder. The piston pin must be lightweight yet strong, as it endures high temperatures and pressures during engine operation. Its proper functioning is crucial for the overall efficiency and performance of the engine.
Egudgeon pin
Egudgeon pin
The piston pin, also known as the wrist pin, serves as a pivot point that connects the piston to the connecting rod in an internal combustion engine. It allows for the rotational movement of the connecting rod while enabling the piston to move up and down within the cylinder. This design facilitates the conversion of linear motion from the piston into rotational motion for the crankshaft, essential for engine operation. Additionally, the piston pin must withstand high temperatures and pressures, making its material and design crucial for engine performance and durability.
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The gudgeon pin or wrist pin (as it is called in the US), connects the piston to the connecting rod and provides a bearing for the connecting rod to pivot upon as the piston moves.
a piston pin is a machined high strength steel "tube" that goes thru the piston and connecting rod and holds them together.
The piston rod is more usually called the con rod or connecting rod. It is connected at the top end to the piston with what is called a wrist pin. (The wrist pin is a cylinder of steel that slides through the side of the piston and through the top hole in the connecting rod.) At the bottom end the connecting rod mates up to the crankshaft. There is what is called a rod cap that goes on the bottom of the connecting rod to hold that rod onto the journal of the crankshaft. The connecting rod's purpose is to transfer downward and upward thrust between the piston and crank. The combustion of fuel drives the piston down to the crankshaft were it is converted to rotary force which drives your wheels. The wrist pin, is called a piston pin or gudgeon pin in the UK. The hole in the con-rod is commonly called the small or little end, and the other end where the cap holds it to the crankshaft is the big end.
Some are pressed in and others use a floating pin held in by retaining clips on each end.
There are three types of piston pins they are, Stationary pin Semi floating pin Full floating pin