Patent ID: 11933207
Assignee: PACCAR INC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A combustion engine comprising:
a cylinder head including:
at least four exhaust ports to receive exhaust gases produced by cylinders of the combustion engine;
at least four cylinder head outlets; and
at least four cylinder head flow paths defined within the cylinder head and fluidly coupling each of the exhaust ports with at least one of the cylinder head outlets;

an exhaust manifold including:
a first end having exhaust manifold inlets, wherein the first end is couplable to the side of the cylinder head to fluidly couple the exhaust manifold inlets with the cylinder head outlets;
a second end having a first exhaust manifold outlet and a second exhaust manifold outlet;
a first exhaust manifold flow path internal to the exhaust manifold that fluidly couples at least two cylinder head flow paths of the at least four cylinder head flow paths with a first set of three exhaust manifold inlets and the first exhaust manifold outlet via at least three branches, wherein the first exhaust manifold flow path is bisectable by a plane, wherein the at least three branches include a central branch having a straight portion, an outer branch having an outer curvature, and a middle branch between the central branch and the outer branch having a maximum curvature that is less than the outer curvature of the outer branch; and
a second exhaust manifold flow path internal to the exhaust manifold, separate from the first exhaust manifold flow path, that fluidly couples at least two cylinder head flow paths of the at least four cylinder head flow paths to the second exhaust manifold outlet.