Outboard motor and watercraft

Patent metadata

Field	Value
Publication number	US-10465641-B1
Application number	US-201514855563-A
Country	US
Kind code	B1
Filing date	Sep 16, 2015
Priority date	Sep 16, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

An outboard motor includes an engine, an engine cover accommodating the engine, and an intake path between the engine cover and the engine. The intake path directs external air to the engine. The engine cover includes an upper cover and a lower cover. The upper cover includes an opening to take external air into the intake path. The intake path includes a first airflow passage, a second airflow passage, and an airflow space. The first airflow passage is at least partially defined by an inner surface of the engine cover, and downwardly directs the external air. The second airflow passage is at least partially defined by the inner surface of the engine cover, and upwardly directs the external air. The airflow space is above the lower cover and continues to the first airflow passage and the second airflow passage.

First claim

What is claimed is:

1. An outboard motor comprising:
an engine;
an engine cover accommodating the engine; and
an intake path between the engine cover and the engine, the intake path configured to direct external air to the engine; wherein
the engine cover includes an upper cover and a lower cover, the upper cover covering the engine from above and lateral sides of the engine, and the lower cover covering the engine from below;
the upper cover includes an opening configured to take in the external air into the intake path, and the opening is provided in an upper portion of the upper cover; and
the intake path includes:
a first airflow passage at least partially defined by an inner surface of the engine cover, and the first airflow passage is configured to downwardly direct the external air taken in through the opening;
a second airflow passage at least partially defined by the inner surface of the engine cover, and the second airflow passage is configured to upwardly direct the external air; and
an airflow space located above the lower cover and extending to the first airflow passage and the second airflow passage, and the airflow space is configured to direct the external air from the first airflow passage to the second airflow passage.

2. The outboard motor according to claim 1 , wherein
the first airflow passage is disposed on a first side with respect to a right-and-left center line of the engine;
the second airflow passage is disposed on a second side, opposite to the first side, with respect to the right-and-left center line of the engine; and
the airflow space extends rightward and leftward with respect to the right-and-left center line.

3. The outboard motor according to claim 1 , wherein a lower end of the second airflow passage is located higher than a lower end of the first airflow passage.

4. The outboard motor according to claim 1 , wherein the second airflow passage has a horizontal cross-sectional area larger than a horizontal cross-sectional area of the first airflow passage.

5. The outboard motor according to claim 1 , further comprising a partition plate disposed between the airflow space and the engine.

6. The outboard motor according to claim 5 , wherein the partition plate is fixed to the lower cover.

7. The outboard motor according to claim 1 , wherein the airflow space is at least partially defined by an outer surface of the engine.

8. The outboard motor according to claim 1 , wherein
the engine is a V-shaped engine including a crankshaft, a first cylinder, and a second cylinder, the crankshaft extending in an up-and-down direction, the first cylinder extending obliquely rearward from the crankshaft, and the second cylinder extending obliquely rearward from the crankshaft;
the first cylinder is disposed symmetrically to the second cylinder with respect to a right-and-left center line of the engine;
the first airflow passage is located rearward of the first cylinder; and
the second airflow passage is located rearward of the second cylinder.

9. The outboard motor according to claim 8 , further comprising an exhaust pipe disposed between the first cylinder and the second cylinder; wherein
the exhaust pipe extends in the up-and-down direction; and
the airflow space is located either below or rearward of the exhaust pipe.

10. The outboard motor according to claim 9 , wherein the exhaust pipe includes a catalyst disposed between the first cylinder and the second cylinder; and
the first airflow passage and the second airflow passage are disposed rightward and leftward with respect to the catalyst.

11. The outboard motor according to claim 1 , wherein the engine cover includes a ventilation port.

12. The outboard motor according to claim 1 , wherein the intake path includes a third airflow passage;
the third airflow passage extends forwardly from an upper end of the second airflow passage; and
the third airflow passage is configured to direct the external air from the second airflow passage to the engine.

13. The outboard motor according to claim 12 , wherein an entrance of the third airflow passage is located higher than a middle of the engine in an up-and-down direction.

14. The outboard motor according to claim 12 , wherein the entrance of the third airflow passage is located higher than a lower end of the first airflow passage in the up-and-down direction.

15. The outboard motor according to claim 12 , wherein the third airflow passage is defined by a hollow member made of a single, unitary component.

16. A watercraft comprising:
a hull; and
the outboard motor recited in claim 1 , the outboard motor being attached to the hull.

Assignees

• Yamaha Motor Co Ltd

Inventors

• Ochiai Katsumi
• Sato Tomoaki
• Itou Yasutaka
• Miyagi Yuta
• Yamada Takayuki

Classifications

• F02M35/168 Primary

  with means, e.g. valves, to prevent water entry · CPC title

• B63H20/32

  Housings {(air intakes for outboard engines F02M35/167)} · CPC title