JPH0575433U - Exhaust structure of ship propulsion - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress vibration of the muffler and improve durability. [Configuration] A drain pipe (6) connecting the drain elbow (5) of the engine (1) and the muffler (3) to the engine side (6
A) and the muffler side (6b) are divided and connected to each other through a flexible pipe (8), and the muffler (3) is supported on a part (10) of the hull.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an exhaust structure of a ship propulsion device used in small ships.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 2, the exhaust structure of a ship propulsion device used for a small boat is configured so that exhaust gas emitted from an engine (1) that drives a water jet pump (not shown) is introduced into an exhaust introduction pipe ( It is introduced into the expansion chamber (3a) of the muffler (3) through 2), where high-temperature and high-pressure exhaust gas is expanded and contracted to reduce the pressure, and at the same time, from the water jet pump to the water jacket (3b) of the muffler (3). The muffler (3) is silenced by being cooled by the cooling water supplied to the inside thereof, and the exhaust gas silenced in the expansion chamber (3a) of the muffler (3) is discharged from the exhaust pipe (4) to the outside of the system. Further, the cooling water after cooling the engine (1) passes through a drain passage (7) formed between the exhaust introduction pipe (2) and the drain elbow (5) and the drain pipe (6). It is supplied to the muffler (3), where it is discharged out of the system together with the cooling water in the water jacket (3b) of the muffler (3).

[0003]

[Problems to be solved by the device]

 In the conventional exhaust structure of the above-mentioned ship propulsion machine, since the muffler (3) is directly connected to the engine (1) through the drain elbow (5) and the drain pipe (6), the vibration of the engine (1) It is transmitted to the muffler (3) through the drain elbow (5) and the drain pipe (6), and the muffler (3) vibrates. When the muffler (3) vibrates in this way, the engine (1) is burdened, and the muffler (3) itself is damaged due to excessive force applied to the support part with the engine (1) due to the vibration. Cause durability problems. Further, since the entire weight of the muffler (3) is supported by the drainage elbow (5), a drainage elbow (5) having a large strength is required, which causes a problem that the cost of the entire apparatus is increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an exhaust structure for a ship propulsion device in which engine vibration is not transmitted to a muffler. ..

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention divides a drain pipe connecting an engine drain elbow and a muffler into an engine side and a muffler side, and connects them through a flexible pipe, and at the same time, connects the muffler to the hull of the hull. It is intended to provide an exhaust structure for a ship propulsion device, which is characterized in that it is partially supported.

[0006]

[Action]

 According to the exhaust structure of the ship propulsion device of the present invention, the drain pipe connecting the drain elbow of the engine and the muffler is divided into the engine side and the muffler side, and these are connected via the flexible pipe, so that the engine Vibration is absorbed by the flexible pipe and is not transmitted to the muffler. Also, by supporting the muffler on a part of the hull, the weight of the muffler applied to the drain elbow of the engine is reduced, so the drain elbow does not need to have high strength.

[0007]

【Example】

 1 is a schematic view for explaining an embodiment of an exhaust structure of a ship propulsion device according to the present invention, which is the same as the exhaust structure of the conventional ship propulsion device of FIG. 2 except for the following points. The same reference numerals are given to the parts, and the description of the overlapping matters will be omitted.

A feature of the present invention is that a drain pipe (6) forming a drain passage (7) together with the drain elbow (5) with the exhaust introduction pipe (2) is integrated with the drain elbow (5). The engine-side drain pipe (6a) and the muffler-side drain pipe (6b) are divided into an engine-side drain pipe (6a) fixed to the muffler (3) and a muffler-side drain pipe (6b) integrally fixed to the muffler (3). ) Is connected via a flexible pipe such as a rubber pipe (8), and the muffler (3) is supported by a part (10) of the hull via a support bracket (9). By doing so, the vibration of the engine (1) is absorbed by the rubber pipe (8) and is not transmitted to the muffler (3), and the vibration of the muffler (3) can be suppressed. For this reason, the engine (1) is not burdened, and the muffler (3) itself is not damaged by vibration, and durability is improved. Moreover, since the vibration of the engine (1) is not transmitted to the muffler (3), the muffler (3) can be supported on a part (10) of the hull via the support bracket (9), which allows the drain elbow to be supported. The strength of (5) can be reduced, and the cost of the entire apparatus can be kept low.

Even if the rubber pipe (8) is used to connect the engine side drain pipe (6a) and the muffler side drain pipe (6b), the cooling water circulates in the drain passage (7). The rubber pipe (8) is not damaged by the heat of the exhaust gas flowing through the exhaust introduction pipe (2).

[0010]

[Effect of the device]

 According to the present invention, the drain pipe that connects the engine drain elbow and the muffler is divided into the engine side and the muffler side, and these are connected via a flexible pipe, so that the vibration of the engine does not occur. It is absorbed by the flexible pipe and is not transmitted to the muffler, which does not impose a burden on the engine, and the muffler itself can be prevented from damage due to vibration, improving durability. Since the muffler is supported on part of the hull, the strength of the drain elbow can be reduced and the cost of the entire system can be kept low.

[Brief description of drawings]

FIG. 1 is a schematic view of an exhaust structure of a ship propulsion device according to the present invention.

FIG. 2 is a schematic view of an exhaust structure of a conventional ship propulsion device.

[Explanation of symbols]

 1 engine 2 exhaust introduction pipe 3 muffler 3a expansion chamber 3b water jacket 4 exhaust pipe 5 drainage elbow 6 drainage pipe 6a engine side drainage pipe 6b muffler side drainage pipe 7 drainage passage 8 rubber pipe 9 support bracket 10 part of the hull

Claims (1)

[Scope of utility model registration request] 1. A drain pipe for connecting a muffler and a drain elbow of an engine is divided into an engine side and a muffler side and these are connected via a flexible pipe, and the muffler is supported on a part of a hull. Exhaust structure for marine propulsion equipment characterized by