Abstract: An internal combustion engine includes a camshaft, a cylinder head, a head cover, a high-pressure pump, and a vacuum pump. The high-pressure pump includes a plunger that abuts against a cam provided on the camshaft. The high-pressure pump is configured to be driven by rotation of the cam such that oil that has lubricated abutting portions of the cam and the plunger collides with an inside wall of the head cover. The vacuum pump is mounted to the cylinder head. The vacuum pump is configured to draw in air from an inlet and discharge an oil mist with air from an outlet. The outlet is arranged such that the oil mist with air from the outlet is discharged into a space where an oil mist formed by a spray of oil that has collided with the inside wall of the head cover stagnates.

Abstract: An internal combustion engine includes a camshaft, a cylinder head, a head cover, a high-pressure pump, and a vacuum pump. The high-pressure pump includes a plunger that abuts against a cam provided on the camshaft. The high-pressure pump is configured to be driven by rotation of the cam such that oil that has lubricated abutting portions of the cam and the plunger collides with an inside wall of the head cover. The vacuum pump is mounted to the cylinder head. The vacuum pump is configured to draw in air from an inlet and discharge an oil mist with air from an outlet. The outlet is arranged such that the oil mist with air from the outlet is discharged into a space where an oil mist formed by a spray of oil that has collided with the inside wall of the head cover stagnates.