JPS6456395U

JPS6456395U -

Info

Publication number: JPS6456395U
Application number: JP15162887U
Authority: JP
Priority date: 1987-10-05
Filing date: 1987-10-05
Publication date: 1989-04-07
Anticipated expiration: 2002-10-05
Also published as: JPH0646798Y2

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す要部を断面
とした側面図、第２図は第１図のＡ―Ａ線視断面
図、第３図は第２図のＢ―Ｂ線視断面図、第４図
は第１図Ｃ―Ｃ線視断面図、第５図はこの考案を
適用する船外機の一例を示す側面図である。１２……ドライブシヤフトハウジング、１３…
…エンジンホルダ、１４……エンジン、１５……
エンジンブロツク、１８……ギヤケース、１９…
…プロペラシヤフト、２１……プロペラ、２３…
…排気マニホールド、２４……排気管、２５……
排気管ハウジング、２７……排気室、３０，３２
……排気路、３７……隔壁、３８，３９……水室
、４０……堰、４３……膨脹室、４４……第１排
気水洗室、４５……第２排気水洗室、６１，６３
……膨脹室。 Fig. 1 is a side view showing an embodiment of this invention with main parts in cross section, Fig. 2 is a sectional view taken along line AA in Fig. 1, and Fig. 3 is a sectional view taken along line BB in Fig. 2. FIG. 4 is a sectional view taken along the line CC in FIG. 1, and FIG. 5 is a side view showing an example of an outboard motor to which this invention is applied. 12...Driveshaft housing, 13...
...Engine holder, 14...Engine, 15...
Engine block, 18... Gear case, 19...
...Propeller shaft, 21...Propeller, 23...
...Exhaust manifold, 24...Exhaust pipe, 25...
Exhaust pipe housing, 27... Exhaust chamber, 30, 32
... Exhaust passage, 37 ... Partition wall, 38, 39 ... Water chamber, 40 ... Weir, 43 ... Expansion chamber, 44 ... First exhaust water washing chamber, 45 ... Second exhaust water washing room, 61, 63
...Inflation chamber.

Claims

[Scope of Claim for Utility Model Registration] 1. An engine is mounted in an engine holder provided at the upper part of a drive shaft housing, a gear case is joined to the lower part of the engine holder, and a propeller shaft is pivotally supported by this gear case, and the drive shaft housing and In an outboard motor having an exhaust system that transmits engine rotation through a power transmission mechanism in a gear case to rotationally drive a propeller and discharges the main exhaust of the engine into water through the gear case, an exhaust expansion chamber is provided below the engine holder. A unitized exhaust manifold with an exhaust water washing chamber is provided, an exhaust pipe and an exhaust pipe housing are provided in a double-tube structure below this exhaust manifold, and a partition wall is provided in the water chamber outside of this exhaust pipe housing. An exhaust system for an outboard motor, characterized in that an upper end of the partition wall extends close to the exhaust manifold to form a dam of cooling water, and a water wall is formed around the exhaust pipe housing. 2. The exhaust system for an outboard motor according to claim 1, wherein the exhaust manifold is provided with an exhaust passage cooling jacket in addition to an exhaust expansion chamber and an exhaust flushing chamber. 3. The exhaust system for an outboard motor according to claim 1, wherein the height of the exhaust manifold is equal to or larger than the minor diameter of the exhaust port of the engine. 4. The exhaust system for an outboard motor according to claim 1, wherein the planar shape of the exhaust manifold matches the shape of the bottom surface of the engine holder. 5. The exhaust manifold has first and second exhaust wash chambers, the second exhaust wash chamber expands upward,
The exhaust system for an outboard motor according to claim 1, which has a larger volume than the first exhaust flush chamber. 6. The outboard motor exhaust system according to claim 1, wherein the water level in the exhaust water washing chamber of the exhaust manifold is higher than the water level in the water wall formed on the outside of the exhaust pipe housing.