Gudgeon
Pin
A
gudgeon pin is the mechanical link that hinges the piston
to the connecting rod. Although simple in appearance,
the gudgeon is a precision-engineered component that must
be strong yet light, close-fitting yet with the freedom to
move, and resistant to wear without causing scuffing. It is
of hollow construction, typically made from fine-grained carbon
steel of controlled hardness, and lapped to a mirror finish.
Its diameter may be up to 40% of the piston diameter, so that
the maximum bearing pressure in the piston does not exceed
55 MN/m2 (8250 lbf/in2). Types of gudgeon pin include semi-floating,
fully-floating, and offset.
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