Engine including crank pin with angled oil passageway

A motorcycle, comprising:

• a frame;
• an engine on the frame, the engine including:
• a flywheel;
• a pinion shaft supporting the flywheel for rotation;
• a piston assembly including a connecting rod with a base end portion having a bearing support structure;
• a bearing;
• a crank pin, the bearing being fit around the crank pin and fit into bearing support structure to support the piston assembly on the crank pin;
• and
• an uninterrupted oil passageway formed by an axial hole in the pinion shaft, a radial hole in the pinion shaft, an aligned hole in the flywheel, an angled hole in the crank pin, and at least one radial hole in one of the crank pin.

A crankshaft assembly for an internal combustion engine having components including a flywheel, a pinion shaft for rotational support of the flywheel, a piston assembly including a connecting rod with a base end portion having a bearing support structure, and a bearing, the components including passageways that align and connect for routing oil, an improvement comprising:

• a crank pin having a cylindrical outer surface, a cylindrical inner surface forming a center-axis hole, and first and second end surfaces;
• a pair of plugs plugging the center-axis hole, each one of the plugs plugging the center-axis hole for a distance L1 from an associated one of the first and second end surface;
• and
• the crank pin having an angled hole extending between the inner and outer surfaces, the angled hole starting on the outer surface at a location along the distance L1 and extending to the inner surface exiting at a location inboard of the distance L1, the angled hole being linear along its length.

A crank pin component for use in crankshaft assembly for an internal combustion engine, where the engine has engine components including passageways that align and connect for routing oil, the crank pin component comprising:

• a crank pin having a cylindrical outer surface adapted to fit into a mating structure on the engine to support one or more of the engine components, at least one cylindrical inner surface forming a center-axis hole, and first and second end surfaces;
• a pair of plugs plugging the center-axis hole, each one of the plugs plugging the center-axis hole for a distance L1 from an associated one of the first and second end surface;
• and
• the crank pin having an angled hole extending between the inner and outer surfaces, the angled hole starting on the outer surface at a location along the distance L1 and extending to the inner surface exiting at a location inboard of the distance L1, the angled hole being linear along its length.