Patent ID: 9261010
Filing Date: 2016-02-16
CPC Classification: F01P,F02F

Claim Text:
1. A liquid-cooled engine comprising: a cylinder head including four cylinders arranged in series along a longitudinal axis of the cylinder head and an exterior side-wall; an exhaust gas discharge system including, for each cylinder, an exhaust port in fluidic communication with the cylinder and an exhaust line, each of the exhaust lines merging in stages forming an exhaust manifold, the exhaust lines associated with a first outer cylinder and a first inner cylinder fluidly converging to form a first merged exhaust line within the cylinder head and the exhaust lines associated with a second inner cylinder and a second outer cylinder fluidly converging to form a second merged exhaust line within the cylinder head, the first and second merged exhaust lines exiting the cylinder head via two exhaust outlets and fluidly converging downstream to form an exhaust gas collector outside the cylinder head, at least a portion of the exhaust manifold is integrated into the cylinder head and extends through the exterior side-wall, the exhaust manifold including an outer separating wall fluidly dividing the exhaust line corresponding to the first inner cylinder from the exhaust line corresponding to the first outer cylinder and an inner separating wall fluidly dividing the exhaust line associated with the first inner cylinder from the exhaust line associated with the second inner cylinder, the inner separating wall extending beyond the exterior side-wall of the cylinder head and having a greater lateral width than the outer separating wall, and a lateral axis perpendicular to the longitudinal axis of the cylinder head; and a coolant jacket including a lower coolant jacket arranged between the exhaust lines and the exterior side-wall of the cylinder head, and an upper coolant jacket arranged on a side of the exhaust lines opposite the lower coolant jacket, wherein at least one connection is provided between the lower coolant jacket and the upper coolant jacket that serves for passing coolant, and wherein the at least one connection is arranged in close proximity to a merged exhaust pipe.