US 8,011,985 B2 · Outboard motor

Abstract

An outboard motor includes an engine, and a top cowling and a bottom cowling that are arranged to cover the engine. A flow-joining pipe is connected to each exhaust port of a plurality of cylinders of the engine. A first exhaust pipe, a second exhaust pipe, and a third exhaust pipe are connected to the flow-joining pipe in sequence. The flow-joining pipe and the first exhaust pipe are connected generally at the same height as a bottommost of the cylinders of the engine. The third exhaust pipe is disposed above a topmost of the cylinders of the engine. A catalyst is disposed in a connecting portion between the first exhaust pipe and the second exhaust pipe so as to be housed in an upper end portion of the first exhaust pipe and in a lower end portion of the second exhaust pipe. The outboard motor is thus able to prevent water from adhering to a catalyst while avoiding any increase in size.

Claims10

Dependent claims

An outboard motor comprising:

an engine casing;
an engine body including a plurality of cylinders aligned vertically in the engine casing;
an exhaust passage arranged to guide burned gas from the plurality of cylinders to a discharge section;
and
a communication passage including a first end connected to a first portion of the exhaust passage and a second end connected to a second portion of the exhaust passage downstream of the first portion so that water in the exhaust passage is discharged from the first end of the communication passage to the second end of the communication passage.

2 more elements

Dependencies are inferred from the claim text.

Outboard motor

Life of this patent

Outboard motor

Life of this patent

Abstract

Claims10