JPS5830085Y2 - Internal combustion engine exhaust silencer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an exhaust silencing device having a structure that can prevent particulate components such as sparks and oil particles contained in exhaust gas from an internal combustion engine from being dissipated to the outside.

Conventionally, exhaust muffling devices for internal combustion engines have had the problem that particulates such as oil particles, carbon particles, and sparks are emitted to the outside together with the exhaust gas, causing a type of pollution.

In particular, this is a serious problem in two-stroke internal combustion engines.

The purpose of the present invention is to solve this problem, and by improving the structure of the volute chamber-type silencing chamber, it achieves the silencing function and the function of preventing the dispersion of the fine particles in the exhaust gas. This improved volute chamber-type silencing chamber constitutes a part or the entirety of a cylindrical exhaust silencing device.

According to the present invention, in an exhaust silencer for an internal combustion engine, which guides exhaust gas from a front end opening to a rear end opening of a cylindrical outer cylinder and performs exhaust noise silencing in a silencing chamber formed inside the outer cylinder, a shaft is installed inside the outer cylinder. Front and rear partition walls are provided which are spaced apart from each other in the direction, and a plate member extending spirally in the radial direction in the space between the partition walls is provided so that the particulates in the exhaust gas receive sufficient inertia force and centrifugal force in the spiral direction. a spiral exhaust passage having a length, an exhaust inlet for introducing exhaust gas into the spiral center of the exhaust passage is provided in the front partition, an exhaust outlet is provided near the outer periphery of the rear partition; There is provided an exhaust muffling device, characterized in that a dead-end section is defined at the outer part of the spiral exhaust passage by further extending beyond the exhaust outlet and abutting the terminal end against the inner surface of the outer cylinder. be done.

In this case, it is preferable to provide a cleaning hole that can be opened and closed near the end of the dead-end area so that carbon, oil, etc. collected in the dead-end area can be easily removed.

In addition, if necessary, the terminal end of the dead-end section may be partially defined by a mesh, so that part of the exhaust gas can be discharged from the dead-end section while particulate components such as flames and oil particles are captured. It is preferable to do so.

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are views showing the main parts of the rear end portion of the exhaust silencer according to the present invention.

From the front end opening (not shown) of the cylindrical outer cylinder 10 to the rear end opening 12
The exhaust gas is guided to the outer cylinder, and a silencing chamber of an appropriate level is formed inside the outer cylinder, thereby reducing the exhaust noise.

In the silencer of the present invention, two partition walls, namely a front partition chamber 14 and a rear partition wall 16, which are spaced apart in the axial direction are provided in the outer cylinder 10, and a plate member is arranged spirally in the radial direction in the space between them. 18 defines a spiral exhaust passage 20 of sufficient length as shown.

An exhaust port 22 is formed in the front partition wall at a location corresponding to the spiral center of the spiral passage 20, and an exhaust outlet 24 is formed in the rear partition wall near its outer periphery.

Therefore, the exhaust gas introduced from the inlet 22 flows radially outward in a spiral path as shown in FIG. It is discharged to the outside from the rear end opening 12.

According to the present invention, the plate member 18 is further extended beyond the exhaust outlet 24 and its terminal end 26 is brought into contact with the inner surface of the outer cylinder 10, so that the plate member, the inner surface of the outer cylinder 10, and the front and rear partition walls 14. 16 defines a passage section or cul-de-sac section 28 with a dead end.

In the embodiment shown in FIG. 1, the above-mentioned spiral chamber-type silencing chamber between the partition walls 14 and 16 is formed as one of the silencing chambers at each stage provided in the outer cylinder 10, and is located on the upstream side thereof. A muffling chamber in the form of an expansion chamber having expansion chambers 32, 32A and small cross-sectional area passages 34, 36 is provided.

Here, the exhaust gas that has been repeatedly expanded and compressed to be muffled is led to the inlet 22 through the passage 36, and then introduced into the spiral exhaust passage 20.

In the embodiment shown in FIGS. 1 and 2, a cleaning hole 3 that can be opened and closed is located near the end of the dead end portion 28 of the wall of the outer cylinder 10.
6 is provided.

The reading plate is normally closed by a plug such as a bokko, which is opened to remove trapped carbon, oil, and other deposits from the exhaust gas.

Further, in the embodiments shown in FIGS. 1 and 2, the terminal end 26 of the plate member is bent in a direction substantially perpendicular to the inner surface of the outer cylinder and is brought into contact with the inner surface of the outer cylinder.

However, as shown in FIG. 3, it is also possible to have a structure in which this part is inscribed in a substantially tangential direction to the inner surface of the outer cylinder and sealed in contact without being particularly bent.

Furthermore, the bent portion at the end of the plate member 18 shown in FIG. 2 is made of a mesh member to sufficiently capture particles such as sparks, carbon, and oil in the exhaust gas, while at the same time allowing a portion of the exhaust gas to flow out through the mesh. It is also possible to adopt a structure in which the exhaust gas is guided to the exhaust outlet 24.

Since the exhaust silencing device of the present invention has the configuration described above, the following effects can be obtained.

In other words, it is the same as in the case of a volute chamber type sound-deadening chamber.

It goes without saying that the exhaust gas introduced from the exhaust port 22 is muffled while passing through the spiral passage 20 to reduce noise, and then flows out from the exhaust outlet 24.

According to the present invention, at the same time, fine particles such as flames and oil particles in the exhaust gas, that is, relatively heavy particle components, are subjected to inertia force and centrifugal force in the radial outward spiral direction while flowing through the spiral passage 20. The gas is then pushed outward through the exhaust outlet 24 and captured near the end closure portion of the dead end portion 28 .

Therefore, it is possible to reduce the noise radiated to the outside and at the same time prevent the release of sparks, carbon, oil particles, etc. in the exhaust gas.

In this way, with a simple structure, it is possible to effectively prevent the risk of fire caused by the emission of sparks, or the environmental pollution caused by the emission of carbon particles, oil, etc.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part of an exhaust silencing device for an internal combustion engine according to the present invention, Fig. 2 is a cross sectional view taken along the line ■-H in Fig. 1, and Fig. 3 is an exhaust silencing device according to another embodiment. FIG. 2 is a cross-sectional view of a portion of the device corresponding to FIG. 2; In each figure, the same reference numbers indicate the same or corresponding parts, 10......Cylindrical outer cylinder, 12...
- Rear end opening, 22...Front bulkhead, 24...
・Rear bulkhead, 18...Temporary member, 20...
Spiral passage, 22...Exhaust inlet, 24...
... Exhaust outlet, 28 ... Dead end section, 36.
...The cleaning holes are shown respectively.

Claims (1)

[Claims for Utility Model Registration] (, 1) An exhaust silencing device for an internal combustion engine that guides exhaust gas from a front end opening of a cylindrical outer cylinder to a front end opening and performs exhaust silencing in a silencing chamber formed in the outer cylinder. Front and rear partition walls spaced apart from each other in the axial direction are provided in the outer cylinder, and a plate member extending spirally in the radial direction in the space between the partition walls prevents particles in the exhaust from inertial force and centrifugal force in the spiral direction. defining a spiral exhaust passage with a length sufficient to absorb the exhaust gas, an exhaust inlet for introducing exhaust gas into the spiral center of the exhaust passage in the front partition, and an exhaust outlet near the outer periphery of the rear partition; The plate member is further extended beyond the exhaust outlet and its terminal end is brought into contact with the inner surface of the outer cylinder, thereby defining a blind alley portion at the outer portion of the spiral exhaust passage. Exhaust silencer for internal combustion engines. (2) Utility Model Registration The exhaust muffler for an internal combustion engine according to claim 1, characterized in that an openable and closable cleaning hole is provided at a position near the end of the blind alley portion of the outer cylinder. (3) Utility model registration Claims Claims 1 or 2, wherein the internal combustion engine is characterized in that the dead end portion is defined by bending the terminal end of the plate member and bringing it into contact with the inner surface of the outer cylinder. Exhaust silencer. (4) Utility Model Registration The exhaust muffling device for an internal combustion engine according to claim 3, characterized in that part or all of the bent end portion of the plate member is a mesh member. (5) Utility model registration Claims 1 or 2, wherein the internal combustion engine is characterized in that the terminal end of the plate member is inscribed in the inner surface of the outer cylinder in a substantially tangential direction to define the dead end portion. Engine exhaust silencer.