US 12,421,886 B2
Outboard motor
Junya Onoue, Shizuoka (JP); Hiroki Koga, Shizuoka (JP); Yoshiyuki Kadobayashi, Shizuoka (JP); Kimitaka Saruwatari, Shizuoka (JP); and Akihiro Noma, Shizuoka (JP)
Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA, Shizuoka (JP)
Filed by YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata (JP)
Filed on Nov. 15, 2022, as Appl. No. 17/987,112.
Claims priority of application No. 2022-062043 (JP), filed on Apr. 1, 2022.
Prior Publication US 2023/0313729 A1, Oct. 5, 2023
Int. Cl. F02B 61/00 (2006.01); F01P 3/20 (2006.01); F02B 61/04 (2006.01)
CPC F01P 3/202 (2013.01) [F02B 61/045 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An outboard motor comprising:
a bracket to mount the outboard motor to a watercraft;
an engine;
an upper case below the engine;
a lower case below the upper case;
a cavitation plate connected to the lower case;
a transmission including:
a drive shaft extending downward from the engine and located in the upper case and the lower case; and
a propeller shaft connected to the drive shaft, extending in a front-rear direction of the outboard motor, and located in the lower case;
a cooling water passage connected to the engine and located in the upper case and the lower case;
a first pump that is a non-positive displacement pump, located below a lower end of the bracket, connected to the transmission, and operable to send cooling water to the engine through the cooling water passage; and
a second pump that is a non-positive displacement pump, driven by a driving force from the transmission, and operable to send the cooling water to the engine through the cooling water passage.