US 12,454,340 B2
Outboard motor
Kimitaka Saruwatari, Shizuoka (JP); Seiji Arai, Shizuoka (JP); and Shuhei Okamoto, Shizuoka (JP)
Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA, Shizuoka (JP)
Filed by YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata (JP)
Filed on Jul. 6, 2022, as Appl. No. 17/858,109.
Claims priority of application No. 2021-125693 (JP), filed on Jul. 30, 2021.
Prior Publication US 2023/0035557 A1, Feb. 2, 2023
Int. Cl. B63H 20/26 (2006.01); B63H 20/24 (2006.01); B63H 23/34 (2006.01); F01N 13/00 (2010.01); F01N 13/12 (2010.01); F02B 61/04 (2006.01); B63H 20/32 (2006.01); F01M 11/00 (2006.01)
CPC B63H 20/26 (2013.01) [B63H 20/245 (2013.01); B63H 23/34 (2013.01); F01N 13/001 (2013.01); B63H 20/24 (2013.01); B63H 20/32 (2013.01); F01M 11/0004 (2013.01); F01N 13/004 (2013.01); F01N 13/12 (2013.01); F01N 2590/021 (2013.01); F02B 61/045 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An outboard motor comprising:
an engine;
a drive shaft extending downward from the engine;
a propeller shaft connected to the drive shaft and extending in a front-rear direction of the outboard motor;
a first case accommodating the engine;
an upper housing below the first case;
an exhaust passage at least partially in the upper housing and extending downward from the engine; and
a second case below the upper housing; wherein
the second case includes:
a torpedo portion including an internal space accommodating the propeller shaft and a rear end located forward of at least a portion of the exhaust passage as seen in a side view of the outboard motor;
an exhaust inlet to which the exhaust passage is connected;
an exhaust outlet to communicate with the internal space of the torpedo portion; and
an exhaust chamber to communicate the exhaust inlet with the exhaust outlet; and
the exhaust passage consists of a singular pipe extending linearly, as seen in a side view of the outboard motor, from the engine to the second case.