Watercraft and exhaust structure of the watercraft

Inactive Publication Date: 2018-02-01
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about improving the efficiency of exhaust in a watercraft. The invention involves a water lock that reduces turbulence and improves the flow of exhaust gas. By directing the flow of exhaust gas in the water lock, force is reduced and the exhaust gas reaches the downstream exhaust pipe smoothly. This also results in improved cooling water drainage efficiency. Overall, the invention improves exhaust efficiency and reduces turbulence in the water lock.

Problems solved by technology

Accordingly, there is a possibility that turbulence occurs in the water lock.
If turbulence occurs in the water lock, it is difficult for the exhaust gas in the water lock to reach the second exhaust pipe, and the exhaust efficiency to the outside of the watercraft body deteriorates.

Method used

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  • Watercraft and exhaust structure of the watercraft
  • Watercraft and exhaust structure of the watercraft
  • Watercraft and exhaust structure of the watercraft

Examples

Experimental program
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Effect test

first preferred embodiment

[0026]FIG. 1 is a schematic view of a watercraft 1 according to a preferred embodiment of the present invention. A right-left direction in FIG. 1 is defined as the front-rear direction of the watercraft 1. The left side in FIG. 1 shows the front of the watercraft 1. A right-left direction of the watercraft 1 is seen when facing in the traveling direction of the watercraft 1. Thus, the near side in a direction perpendicular to the sheet of FIG. 1 corresponds to the left of the watercraft 1, and the far side in the direction perpendicular to the sheet of FIG. 1 corresponds to the right of the watercraft 1.

[0027]The watercraft 1 includes a watercraft body 2, and an engine 3 in an interior of the watercraft body 2. The watercraft body 2 includes a hull 4 that defines a watercraft bottom, and a deck 5 located above the hull 4. The watercraft body 2 is elongated in the front-rear direction. The engine 3 is located in an engine room between the hull 4 and the deck 5 in an up-down direction...

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Abstract

An exhaust system for a watercraft with an engine includes an upstream exhaust pipe including an end portion with an outlet, a water lock including an inner space accommodating the end portion, a downstream exhaust pipe connected to the water lock, and a flow direction diverter, such as a baffle. The upstream exhaust pipe guides exhaust gas from the engine to the end portion. The inner space of the water lock receives the exhaust gas from the outlet of the end portion. The downstream exhaust pipe exhausts the exhaust gas from the inner space to an outside of the watercraft body. The flow direction diverter changes a flow direction of the exhaust gas at the outlet to a cross direction which intersects a pipe axis of the end portion.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The present invention relates to a watercraft including an engine, and an exhaust system for the watercraft.2. Description of the Related Art[0002]A water vehicle disclosed in Japanese Patent Application Publication No. 2008-157217 includes an exhaust device that exhausts gas emitted from an engine to the outside of a watercraft body. The exhaust device includes a first exhaust pipe extending rearward from a side portion of the engine, a water lock having a tank shape connected to a rear end portion of the first exhaust pipe, and a second exhaust pipe which is connected to a rear portion of the water lock and which opens at a lower portion of a rear end of the watercraft body. The interior of the water lock is divided into an upstream area and a downstream area by a partition. A partition pipe penetrates the partition. The rear end portion of the first exhaust pipe includes an inner pipe located at the upstream area in the wa...

Claims

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Application Information

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IPC IPC(8): B63H21/32B63B35/73F01N13/00B63H11/04
CPCB63H21/32B63H11/04B63B2751/00F01N13/004B63B2758/00B63B35/731B63B34/10F01N13/082F01N13/085F01N2240/20F01N2590/022F01N13/00
InventorOKAMOTO, HARUO
OwnerYAMAHA MOTOR CO LTD