Abstract: An oil storage structure for an internal combustion engine is configured so that an oil pickup port remains immersed when an oil surface fluctuates, both in the fore-and-aft direction due to acceleration and deceleration of a vehicle, and also in the lateral direction, due to sudden turning of the vehicle. The oil storage structure includes an oil storage chamber provided at the bottom of the internal combustion engine, and an oil supply pipe for drawing in oil from a pickup port in the oil storage chamber. The oil storage chamber includes a first subchamber having an opening on top thereof for receiving the oil supply pipe, and a second oil subchamber provided adjacent to the first oil subchamber, and substantially sealed in relation thereto. An upper wall of the second oil subchamber is disposed at a level below a full oil surface level of the first oil subchamber.

Abstract: An oil storage structure for an internal combustion engine is configured so that an oil pickup port remains immersed when an oil surface fluctuates, both in the fore-and-aft direction due to acceleration and deceleration of a vehicle, and also in the lateral direction, due to sudden turning of the vehicle. The oil storage structure includes an oil storage chamber provided at the bottom of the internal combustion engine, and an oil supply pipe for drawing in oil from a pickup port in the oil storage chamber. The oil storage chamber includes a first subchamber having an opening on top thereof for receiving the oil supply pipe, and a second oil subchamber provided adjacent to the first oil subchamber, and substantially sealed in relation thereto. An upper wall of the second oil subchamber is disposed at a level below a full oil surface level of the first oil subchamber.