Title:
SHIP PROPULSION MACHINE, SHIP, SHIP ENGINE AND SHIP ENGINE EXHAUST STRUCTURE
Document Type and Number:
Japanese Patent JP2023073138
Kind Code:
A
Abstract:
To provide: a ship propulsion machine capable of reducing a pressure loss in engine exhaust; a ship including the ship propulsion machine; a ship engine included in the ship propulsion machine; and a ship engine exhaust structure.SOLUTION: A ship propulsion machine includes an engine 20 and a propulsion unit driven with the engine 20. The engine 20 has: a plurality of cylinders which is serially arranged; a plurality of exhaust ports 54 which are respectively connected to combustion chambers of the plurality of cylinders, is curved in a predetermined downstream direction, and allows exhaust to flow out of the combustion chambers; and a collecting exhaust pipe 71. The collecting exhaust pipe 71 is integrated with the plurality of exhaust ports 54 and extended in the downstream direction so as to allow the exhaust in the exhaust ports 54 to flow in the downstream direction. A concave section 75 is installed on an inner face of a connection section between the exhaust ports 54 and the collecting exhaust pipe 71.SELECTED DRAWING: Figure 6
Inventors:
KASAI SHINYA
NAKAYAMA KOICHI
FUKUOKA JIRO
NAKAYAMA KOICHI
FUKUOKA JIRO
Application Number:
JP2021185987A
Publication Date:
May 25, 2023
Filing Date:
November 15, 2021
Export Citation:
Assignee:
YAMAHA MOTOR CO LTD
International Classes:
F01N13/10; B63H20/24; B63H21/14; F01N13/12; F02F1/42
Attorney, Agent or Firm:
Patent Attorney Corporation Ai Patent Office