V-type engine, outboard motor, and vessle

摘要

A V-type engine includes two exhaust manifolds connected to two cylinder banks. First and second exhaust ports, respectively provided in the two cylinder banks, are disposed at an inner side of V-shaped lines. Each exhaust manifold includes N branch pipes and a collecting pipe, where N is an integer not less than 2. The N branch pipes are respectively connected to N exhaust ports including at least one of the first exhaust ports and at least one of the second exhaust ports. The collecting pipe is disposed adjacent to N cylinders that are aligned in a direction parallel or substantially parallel to a crank axis direction and extends from one end to the other end of the N cylinders.

主权项

1. A V-type engine comprising:
two cylinder banks including N, in which N is an integer not less than 2, first cylinders aligned in a direction parallel or substantially parallel to a crank axis direction and N second cylinders aligned in a direction parallel or substantially parallel to the crank axis direction, the two cylinder banks being disposed along V-shaped lines defined by a first plane passing through center lines of the N first cylinders and a second plane passing through center lines of the N second cylinders; N first exhaust ports disposed at an inner side of the V-shaped lines when viewed from the crank axis direction and respectively connected to the N first cylinders; N second exhaust ports disposed at the inner side of the V-shaped lines when viewed from the crank axis direction and respectively connected to the N second cylinders; a first exhaust manifold including N first branch pipes respectively connected to N exhaust ports that include at least one of the first exhaust ports and at least one of the second exhaust ports, and a first collecting pipe, the first exhaust manifold being disposed adjacent to the N first cylinders, the first exhaust manifold extending from one end to another end of the N first cylinders aligned in the direction parallel or substantially parallel to the crank axis direction; and a second exhaust manifold that includes N second branch pipes respectively connected to N exhaust ports that include at least one of the first exhaust ports and at least one of the second exhaust ports, and a second collecting pipe, the second exhaust manifold being disposed adjacent to the N second cylinders, the second exhaust manifold extending from one end to another end of the N second cylinders aligned in the direction parallel or substantially parallel to the crank axis direction.