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;
• wherein the angled hole defines enlarged openings larger than a diameter of the hole in an inner surface and in an outer surface of the crank pin, the enlarged openings facilitating alignment with the axial hole in the pinion shaft and the aligned hole in the flywheel.

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, wherein the angled hole defines an angle of at least about 45 degrees from a longitudinal centerline 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;
• wherein the angled hole defines enlarged openings larger than a diameter of the hole in an inner surface and in an outer surface of the crank pin, the enlarged openings facilitating alignment with the axial hole in the pinion shaft and the aligned hole in the flywheel.

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;
• wherein the angled hole enters the outer surface at about 0.5 inches inboard of an end of the crank pin and exits the inner surface at about 1⅛ inches from the end.

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;
• wherein the crank pin is tubular and has an inner surface, and including a plug fit into an end of the crank pin, the plug being sized to friction fit into the inner surface.

An internal combustion engine assembly, comprising:

• a flywheel and 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 tubular crank pin with plugged ends, the bearing being fit around the crank pin and into the bearing support structure to support the piston assembly on the spindle, the crank pin being tubular and having an inner surface and including at least one plug fit into an end of the crank pin that is sized to friction fit into the inner surface;
• 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 the crank pin.

An internal combustion engine assembly, comprising:

• a flywheel and 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 tubular crank pin with plugged ends, the bearing being fit around the crank pin and into the bearing support structure to support the piston assembly on the spindle;
• 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 the crank pin;
• wherein the angled hole defines an angle of at least about 45 degrees from a longitudinal centerline of the crank pin.