Exhaust gas-cooling pipe element and internal combustion engine exhaust system

摘要

In an exhaust gas-cooling pipe element provided between an exhaust port of an internal combustion engine and an exhaust branch pipe, a center axis of an exhaust introduction opening that is connected to the exhaust port and a center axis of an exhaust discharge opening that is connected to the exhaust branch pipe are placed out of alignment with each other.

主权项

1. An internal combustion engine exhaust system comprising:
an exhaust gas-cooling pipe element provided between an exhaust port and an exhaust branch pipe, the exhaust gas-cooling element having a plurality of exhaust channels, each of the plurality of exhaust channels has an exhaust introduction opening and an exhaust discharge opening; wherein an opening portion of the exhaust port and an opening portion of the exhaust branch pipe that are connected by each of the exhaust gas-cooling channels of the exhaust gas-cooling pipe element are disposed so that the opening portion of the exhaust port is positioned above the opening portion of the exhaust branch pipe in a vertical direction, and wherein a central axis of the opening of the exhaust port and a center axis of the opening of the exhaust branch pipe are non-parallel to each other, wherein the exhaust gas-cooling pipe element includes a pipe wall in which a cooling fluid passageway and a communication hole are formed, the communication hole provides communication between the cooling fluid passageway and an outside, the communication hole is closed with a plug, the communication hole is provided above the cooling fluid passageway in the vertical direction, and an axis direction of the communication hole is angled to the vertical direction.