What is the term for the area around the piston pin hole that is reinforced to prevent breakage?

The term for the area around the piston pin hole that is reinforced to prevent breakage is known as the piston boss. The piston boss provides structural integrity and support for the piston pin, which connects the piston to the connecting rod in an engine. This reinforcement is crucial because the area around the piston pin hole experiences significant stress during the engine's operation, particularly during the high-speed and high-pressure cycles of combustion.

In contrast, the piston skirt refers to the lower part of the piston that guides it within the cylinder and helps maintain alignment. The piston cap is not a commonly used term in this context, and the piston collar does not relate specifically to the reinforcement around the piston pin hole. Understanding the function and structure of different piston parts is essential for analyzing engine performance and design.