Outboard motor and vessel

Patent metadata

Field	Value
Publication number	US-9828079-B2
Application number	US-201614996584-A
Country	US
Kind code	B2
Filing date	Jan 15, 2016
Priority date	Feb 25, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

An outboard motor includes a catalyst housing passage disposed inside the V-shaped line, a cooling water passage including at least a portion disposed at a periphery of a catalyst and that guides cooling water that cools an exhaust passage and a vent hole disposed higher than the catalyst and that connects the interior of the cooling water passage to the exterior of the cooling water passage.

First claim

What is claimed is:

1. An outboard motor comprising:
an engine including a plurality of cylinders disposed along a V-shaped line when viewed in a plan view of the engine and a pair of cylinder heads including a plurality of exhaust ports disposed inside the V-shaped line;
an exhaust passage that includes an exhaust pipe and guides an exhaust generated in the engine, the exhaust passage including a catalyst housing passage into which the exhaust from the plurality of exhaust ports flows, the catalyst housing passage disposed inside the V-shaped line and provided in a catalyst case;
a catalyst disposed inside the catalyst housing passage and that purifies the exhaust flowing inside the exhaust passage;
a cooling water passage including at least a portion disposed at a periphery of the catalyst and that guides cooling water that cools the exhaust passage;
a water pump disposed lower than the catalyst and that supplies water from outside the outboard motor as the cooling water to the cooling water passage via a water inlet that opens at an outer surface of the outboard motor; and
a plurality of vent holes that are disposed higher than the catalyst and that connect an interior of the cooling water passage to an exterior of the cooling water passage; wherein
each of the plurality of vent holes is provided in the exhaust pipe or in the catalyst case.

2. An outboard motor comprising:
an engine including a plurality of cylinders disposed along a V-shaped line when viewed in a plan view of the engine and a pair of cylinder heads including a plurality of exhaust ports disposed inside the V-shaped line;
an exhaust passage that guides an exhaust generated in the engine, the exhaust passage including a catalyst housing passage into which the exhaust from the plurality of exhaust ports flows, the catalyst housing passage disposed inside the V-shaped line;
a catalyst disposed inside the catalyst housing passage and that purifies the exhaust flowing inside the exhaust passage;
a cooling water passage including at least a portion disposed at a periphery of the catalyst and that guides cooling water that cools the exhaust passage;
a water pump disposed lower than the catalyst and that supplies water from outside the outboard motor as the cooling water to the cooling water passage via a water inlet that opens at an outer surface of the outboard motor; and
a vent hole disposed higher than the catalyst and that connects an interior of the cooling water passage to an exterior of the cooling water passage; wherein
a flow passage area of the vent hole is smaller than a flow passage area of the cooling water passage.

3. The outboard motor according to claim 1 , wherein the plurality of vent holes are positioned at an uppermost portion of the cooling water passage.

4. The outboard motor according to claim 1 , wherein the plurality of vent holes are positioned further downstream than the catalyst in a direction of flow of the cooling water.

5. The outboard motor according to claim 1 , wherein the outboard motor further comprises:
a pilot hole that opens to air; and
a pilot piping defining at least a portion of a pilot passage that guides a fluid between the plurality of vent holes and the pilot hole.

6. An outboard motor comprising:
an engine including a plurality of cylinders disposed along a V-shaped line when viewed in a plan view of the engine and a pair of cylinder heads including a plurality of exhaust ports disposed inside the V-shaped line;
an exhaust passage that guides an exhaust generated in the engine, the exhaust passage including a catalyst housing passage into which the exhaust from the plurality of exhaust ports flows, the catalyst housing passage disposed inside the V-shaped line;
a catalyst disposed inside the catalyst housing passage and that purifies the exhaust flowing inside the exhaust passage;
a cooling water passage including at least a portion disposed at a periphery of the catalyst and that guides cooling water that cools the exhaust passage;
a water pump disposed lower than the catalyst and that supplies water from outside the outboard motor as the cooling water to the cooling water passage via a water inlet that opens at an outer surface of the outboard motor;
a vent hole disposed higher than the catalyst and that connects an interior of the cooling water passage to an exterior of the cooling water passage;
a pilot hole that opens to air; and
a pilot piping defining at least a portion of a pilot passage that guides a fluid between the vent hole and the pilot hole; wherein
a flow passage area of the pilot passage is smaller than a flow passage area of the cooling water passage.

7. An outboard motor comprising:
an engine including a plurality of cylinders disposed along a V-shaped line when viewed in a plan view of the engine and a pair of cylinder heads including a plurality of exhaust ports disposed inside the V-shaped line;
an exhaust passage that guides an exhaust generated in the engine, the exhaust passage including a catalyst housing passage into which the exhaust from the plurality of exhaust ports flows, the catalyst housing passage disposed inside the V-shaped line;
a catalyst disposed inside the catalyst housing passage and that purifies the exhaust flowing inside the exhaust passage;
a cooling water passage including at least a portion disposed at a periphery of the catalyst and that guides cooling water that cools the exhaust passage;
a water pump disposed lower than the catalyst and that supplies water from outside the outboard motor as the cooling water to the cooling water passage via a water inlet that opens at an outer surface of the outboard motor;
a vent hole disposed higher than the catalyst and that connects an interior of the cooling water passage to an exterior of the cooling water passage; and
a pair of exhaust manifolds defining at least a portion of the exhaust passage and that guides the exhaust generated in the engine to the catalyst; wherein
a portion of the cooling water passage is provided in the pair of exhaust manifolds; and
the vent hole is disposed between the pair of exhaust manifolds and the catalyst in a direction of flow of the cooling water.

8. The outboard motor according to claim 7 , wherein the vent hole is positioned at an uppermost portion of the exhaust manifold.

9. The outboard motor according to claim 1 , wherein the outboard motor further comprises an engine cover that covers the engine, and the catalyst is disposed inside the engine cover.

10. The outboard motor according to claim 1 , wherein at least a portion of the exhaust passage is made of a material that contains aluminum, and at least a portion of the cooling water passage is made of a material that contains aluminum.

11. The outboard motor according to claim 7 , wherein
the plurality of cylinders include a first plurality of cylinders and a second plurality of cylinders;
the pair of exhaust manifolds include a first exhaust manifold and a second exhaust manifold; and
in a rear view of the engine, the first exhaust manifold overlaps with the first plurality of cylinders and the second exhaust manifold overlaps with the second plurality of cylinders.

12. The outboard motor according to claim 11 , wherein a flow passage area of the catalyst housing portion is greater than a flow passage area of the first exhaust manifold and is greater than a flow passage area of the second exhaust manifold.

13. A vessel comprising:
the outboard motor according to claim 1 ; and
a hull propelled by the outboard motor.

Assignees

• Yamaha Motor Co Ltd

Inventors

• Ochiai Katsumi

Classifications

• F01N13/105

  having the form of a chamber directly connected to the cylinder head, e.g. without having tubes connected between cylinder head and chamber · CPC title

• F01N13/107

  More than one exhaust manifold or exhaust collector · CPC title

• F01N3/043

  without contact between liquid and exhaust gases · CPC title

• B63H20/28 Primary

  Arrangements, apparatus and methods for handling cooling-water in outboard drives, e.g.} cooling-water intakes {(cooling circuits for outboard marine engines F01P3/202) · CPC title

• B63H20/24 Primary

  Arrangements, apparatus and methods for handling exhaust gas in outboard drives, e.g.} exhaust gas outlets {(in engines, e.g. outboard marine engines, F01N) · CPC title