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Exhaust arrangement for outboard marine drive engine

An engine and marine technology, applied in the direction of propulsion engine, engine components, engine cooling, etc., can solve the problems of complex structure, increased manufacturing cost, engine output loss, etc.

Inactive Publication Date: 2003-07-23
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this makes the structure complicated and thus increases the manufacturing cost
And the water pump causes a corresponding output loss of the engine

Method used

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  • Exhaust arrangement for outboard marine drive engine
  • Exhaust arrangement for outboard marine drive engine
  • Exhaust arrangement for outboard marine drive engine

Examples

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Embodiment Construction

[0014] Fig. 1 is a side view generally showing an external marine drive unit embodying the present invention. The outboard marine drive 1 is suitable for connection to the transom of a boat (not shown in the figure) with a rear support 2 having a fastening function. The swivel housing 4 is connected to the rear support 2 by a turning shaft 3 extending horizontally and across the width of the boat. The rotating housing 4 itself supports a tubular extension housing 6 inside which houses a vertically extending drive shaft 5 . The swivel housing 4 allows the body of the outboard boat drive to rotate 360 ​​degrees relative to the rear support 2 or the boat about a vertical steering axis.

[0015] The upper end of the extension housing 6 is connected to an internal combustion engine 7, and the lower end of the extension housing 6 is connected to a bevel gear mechanism housing a propeller shaft 9 and for transmitting rotational power from the lower end of the drive shaft 5 to the pr...

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PUM

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Abstract

In an outboard marine drive, a primary partition made of elastomeric material is provided in a lower part of the extension case, and a drive shaft and an exhaust pipe are sealingly passed through the primary partition. Thereby, the extension case is kept out of direct contact from the exhaust gas, and is therefore prevented from excessive heating. The exhaust pipe and the drive shaft typically have a large length, and it is advantageous to support them at parts thereof near a lower end thereof. The use of elastomeric material for the primary partition is particularly advantageous because it not only can favorably insulate heat but also can accommodate any positional errors in the exhaust pipe and the drive shaft relative to the extension case. When a secondary opening is formed in an upper part of the exhaust pipe to prevent excessive build up of exhaust back pressure when the engine is idling, a secondary partition may also be provided in an upper part of the extension case.

Description

technical field [0001] The invention relates to an outboard marine drive for an air-cooled internal combustion engine. Background technique [0002] Air-cooled internal combustion engines are advantageous for small outboard marine drives in order to save weight. Since the exhaust gas from the engine is at a high temperature, it is necessary to prevent the heat of the exhaust gas from heating the various parts of the outboard marine drive. According to the invention disclosed in Japanese Utility Model Publication (kokoku) No. 2-13703, a small water pump is arranged at the lower end of the vertical drive shaft so as to supply water to the upper portion of the extension housing adjacent to the exhaust port. However, this complicates the structure and thus increases manufacturing costs. And the water pump causes a corresponding output loss of the engine. Contents of the invention [0003] Because of these problems in the prior art, the main object of the present invention i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63H20/24F01N13/12F02B61/04F02B75/02F02B75/16
CPCB63H20/245F01N13/14F01N2260/14F02B61/045F02B75/16F01N13/12F01N2590/021F01N13/004F02B2075/027F01P5/06
Inventor 水口博田中充治
Owner HONDA MOTOR CO LTD
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