Abstract: A piston for an internal combustion engine is disclosed. The piston body has two pin bores for receiving a piston pin. At least one rib is disposed on the second side and extends outwardly therefrom. The at least one rib is aligned laterally between the two pin bores in a direction along the piston pin axis. The at least one rib has a longitudinal axis extending generally perpendicular to both the reciprocation axis of the piston and the piston pin axis. A piston having a boss extending approximately within the piston pin radius of the piston pin axis, and a piston having a boss generally following the contour of the piston pin are also disclosed. An engine having the piston is also disclosed.

Abstract: A piston for an internal combustion engine is disclosed. The piston body has two pin bores for receiving a piston pin. At least one rib is disposed on the second side and extends outwardly therefrom. The at least one rib is aligned laterally between the two pin bores in a direction along the piston pin axis. The at least one rib has a longitudinal axis extending generally perpendicular to both the reciprocation axis of the piston and the piston pin axis. A piston having a boss extending approximately within the piston pin radius of the piston pin axis, and a piston having a boss generally following the contour of the piston pin are also disclosed. An engine having the piston is also disclosed.

Abstract: A light weight piston for an internal combustion engine is disclosed that minimizes the stresses found in a transition area between the piston head and the associated piston pin bosses while maintaining a flexible soft connection between the piston skirts and the piston head. The piston includes a pair of piston skirts having tapered edges. Flared connecting walls are provided such that the distance between the connecting walls is minimized adjacent a pair of piston pin bosses and the distance between the connecting walls is maximized adjacent a portion of the tapered edges. The connecting wall flares in a generally outward direction such that at least a portion of the inner surfaces of the connecting wall has a generally convex curvature.

Abstract: A light weight piston for an internal combustion engine is disclosed that minimizes the stresses found in a transition area between the piston head and the associated piston pin bosses while maintaining a flexible soft connection between the piston skirts and the piston head. The piston includes a pair of piston skirts having tapered edges. Flared connecting walls are provided such that the distance between the connecting walls is minimized adjacent a pair of piston pin bosses and the distance between the connecting walls is maximized adjacent a portion of the tapered edges. The connecting wall flares in a generally outward direction such that at least a portion of the inner surfaces of the connecting wall has a generally convex curvature.