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Exhaust structure for small watercraft

A ship and small technology, applied in ship propulsion, exhaust device, ship construction, etc., can solve the problems of complicated shape of the backflow prevention chamber, hinder the cost of suppressing the backflow prevention chamber, etc., and achieve the effect of simplifying the structure and realizing the manufacturing.

Inactive Publication Date: 2007-08-29
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Furthermore, in order to provide a water jacket on the peripheral wall of the backflow prevention chamber, the shape of the backflow prevention chamber becomes complicated, which prevents the cost of the backflow prevention chamber from being suppressed.

Method used

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  • Exhaust structure for small watercraft
  • Exhaust structure for small watercraft
  • Exhaust structure for small watercraft

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Embodiment Construction

[0036] Hereinafter, the best mode for carrying out the present invention will be described based on the drawings. In addition, "front", "rear", "left", and "right" are the directions that follow the driver's view, and the front side is set as Fr, the rear side is set as Rr, and the left side is set as L, The right side is represented by R.

[0037] Fig. 1 is a side view showing a small watercraft according to the present invention.

[0038] Small watercraft 10 is a water jet propulsion boat, which has a fuel tank 12 on the front part 11a of the hull 11, an engine 13 behind the fuel tank 12, and a pump chamber 14 behind the engine 13, in which 14 has a water jet pump 15, has a drive shaft 17 that connects the water jet pump 15 to the output shaft of the engine 13, has an air intake structure 20 that supplies air to the engine 13, and has an exhaust structure that exhausts exhaust gas from the engine (for small ships) Exhaust structure) 21, has a helm handle 22 above the fuel ...

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Abstract

The invention provides an exhaust structure for a small watercraft that can cool exhaust gas, reduce a size, weight, and also the cost of a backflow prevention chamber. The exhaust structure 21 for a small watercraft is configured to cool exhaust gas in the course of leading the gas to the outside when the exhaust gas of an engine is led to the outside for discharge. This exhaust structure 21 includes a water muffler 54 containing water therein, and provided in the course of leading the exhaust gas to the outside. A backflow prevention chamber 53 is disposed above the water muffler 54 and adapted to prevent water from entering the side of the engine 13 from the side of the water muffler 54. The backflow prevention chamber 53 is provided with a cooling water injecting portion 66 adapted to spray cooling water to the exhaust gas in an internal space 76. An outlet 71 is formed at the bottom 56c of the backflow prevention chamber 53 to communicate with the water muffler 54.

Description

technical field [0001] The present invention relates to an exhaust structure of a small ship capable of cooling the exhaust gas while guiding the exhaust gas of an engine to the outside. Background technique [0002] In the exhaust structure of small ships, there is the following structure: there is an exhaust system that discharges the exhaust gas of the engine to the outside, a water muffler is provided on the way of the exhaust system, and a water muffler is installed above the water muffler to prevent water from flowing from the water. The exhaust body (backflow prevention chamber) of the muffler that intrudes toward the engine side is provided with a water jacket on the peripheral wall of the backflow prevention chamber (for example, refer to Patent Document 1). [0003] Patent Document 1: JP-A-2003-176719 [0004] According to the exhaust structure of this small ship, when the exhaust gas is exhausted from the engine and the exhaust gas flows into the exhaust system t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63H21/32F01N7/12B63B35/73F01N3/02F01N3/04F01N13/12
CPCF01N13/085F01N13/12F01N3/02Y02T10/20Y02T10/12
Inventor 熊坂刚志楠田笃志松本雅继
Owner HONDA MOTOR CO LTD
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