Piston assembly and wrist pin therefor providing a method of controlling rotation of the wrist pin within corresponding piston pin bores and connecting rod wrist pin bore

摘要

A piston assembly and wrist pin therefor provide a method for controlling rotation of the wrist pin with respective piston pin bores and connecting rod small end wrist pin bore. The wrist pin has a cylindrical body with opposite end portions spaced axially from one another by a central portion and a through bore of varying internal diameter. The through bore has first diameter and second diameters, wherein the first diameter is less than the second diameter. The first diameter is defined in one of the central portion or the opposite end portions, while the second diameter is defined in the other of the central portion or the opposite end portions. The first diameter transitions to the second diameter generally between the small end of the connecting rod and the pin bores of the piston.