Exhaust manifold for four-cylinder engine
First Claim
1. An engine comprising:
- a cylinder head defining first, second, third and fourth cylinders; and
an exhaust manifold connected with the cylinder head, for conveying exhaust from the cylinders, the exhaust manifold comprising;
first, second, third and fourth exhaust branches connected, respectively, with the first, second, third and fourth cylinders;
a first convergent branch into which the first and fourth exhaust branches converge together;
a second convergent branch into which the second and third exhaust branches converge together; and
a collection portion into which the first convergent branch and the second convergent branch converge together;
wherein the second and third exhaust branches extend, respectively, along center lines intersecting each other at a second convergent point which is located in the second convergent branch and which is not located within the collection portion;
wherein the first and fourth exhaust branches extend, respectively, along center lines which extend through the first convergent branch without intersecting each other, and which intersect each other at a first convergent point located in the collection portion; and
wherein the exhaust flow path between the cylinder head and the second convergent point is shorter than the exhaust flow path between the cylinder head and the first convergent point.
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Accused Products
Abstract
In an exhaust manifold of a four-cylinder engine four cylinders of which line up in order of cylinder #1, cylinder #2, cylinder #3 and cylinder #4, temperature rise performance of a manifold catalyst improves by shortening a total length of the exhaust manifold while preventing exhaust gas interference between the cylinders. Therefore, an exhaust manifold branch of cylinder #1 and an exhaust manifold branch of cylinder #4 in outward sides of the engine that are not fired in succession are made convergent with its convergence angle θ1 being equal to or below 20 degrees to form a first convergent exhaust manifold branch and an exhaust manifold branch of cylinder #2 and an exhaust manifold branch of cylinder # 3 between the cylinder #1 and cylinder #4 that are not fired in succession are made convergent at a minimum distance having a laterally projected shape to form a second convergent exhaust manifold branch. The first and the second convergent exhaust manifold branches are thereafter convergent at a convergence angle θ3 from 0 degrees to 20 degrees.
24 Citations
8 Claims
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1. An engine comprising:
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a cylinder head defining first, second, third and fourth cylinders; and an exhaust manifold connected with the cylinder head, for conveying exhaust from the cylinders, the exhaust manifold comprising; first, second, third and fourth exhaust branches connected, respectively, with the first, second, third and fourth cylinders; a first convergent branch into which the first and fourth exhaust branches converge together; a second convergent branch into which the second and third exhaust branches converge together; and a collection portion into which the first convergent branch and the second convergent branch converge together; wherein the second and third exhaust branches extend, respectively, along center lines intersecting each other at a second convergent point which is located in the second convergent branch and which is not located within the collection portion; wherein the first and fourth exhaust branches extend, respectively, along center lines which extend through the first convergent branch without intersecting each other, and which intersect each other at a first convergent point located in the collection portion; and wherein the exhaust flow path between the cylinder head and the second convergent point is shorter than the exhaust flow path between the cylinder head and the first convergent point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification