Wrist pin and method of reducing wear between members thereof, connecting rod, piston and methods of constructing same

A method of constructing a wrist pin for receipt in axially aligned pin bores of a piston body, comprising:

• forming a first portion having a length extending between opposite ends configured for receipt in the pin bores;
• forming a second portion having a length extending between opposite ends configured for receipt in the pin bores, said second portion being formed of a separate piece of material from said first portion;
• configuring said first portion and said second portion for engagement along their lengths and for relative movement with one another;
• further including forming one of said first portion or said second portion with a concave surface and the other of said first portion or said second portion with a convex surface and configuring said convex surface for engagement with said convex surface;
• and
• further including providing lubrication pockets extending between said convex surface and said concave surface.

A piston assembly, comprising:

• a piston body;
• a connecting rod having a small end bore extending along a central axis;
• a wrist pin extending through said small end bore and coupling said connecting rod to said piston body, said wrist pin having separate first and second portions, said first and second portions being moveable relative to one another and having lengths extending substantially parallel to said central axis through said small end bore;
• wherein one of said first and second portions has a concave outer surface extending along its length and the other of said first and second portions has a convex outer surface extending along its length, said convex outer surface abutting said concave outer surface for relative movement with one another;
• and
• wherein lubrication pockets extend between said convex and said concave outer surfaces along the lengths of said first and second portions.