INTERNAL COMBUSTION ENGINE

摘要

An internal combustion engine is equipped with a connecting rod and an oil jet. The connecting rod has a small end portion that is coupled to a piston, and the small end portion and a large end portion that is coupled to a crankshaft are connected to each other by a shaft portion. The oil jet injects oil toward a reverse face of the piston. With this internal combustion engine, a communication hole that opens toward the reverse face of the piston and that communicates with a pin hole is provided through the small end portion of the connecting rod. A lower portion of an inner peripheral face that forms the pin hole of the small end portion protrudes more in a direction of extension of a central axis of the pin hole than an upper portion.

主权项

1. An internal combustion engine comprising:
a cylinder block; a piston accommodated in a reciprocable manner in a cylinder that is provided in the cylinder block; a piston pin; a crankshaft; and a connecting rod including
a small end portion through which a pin hole is provided, the small end portion rotatably supporting the piston pin with an inner peripheral face of the small end portion and an outer peripheral face of the piston pin serving as sliding faces, the inner peripheral face defining the pin hole, and the small end portion being coupled to the piston via the piston pin,a large end portion coupled to the crankshaft, anda shaft portion connected to the small end portion and the large end portion,the small end portion including
an upper portion, anda lower portion including the inner peripheral face of the pin hole, the lower portion being a region that is located below the upper portion in a vertical direction when a direction of extension of the shaft portion and a direction of motion of the piston are parallel to each other, and the lower portion protruding more outward toward a direction of a central axis of the pin hole than the upper portion.