JPH0721854Y2 - Silencer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer attached to the end portion of an exhaust pipe of an engine.

[0002]

2. Description of the Related Art Conventionally, a silencer has an outer tube provided with a sound absorbing material on the outer periphery of a perforated tube portion as shown in, for example, Japanese Utility Model Application No. 59-165520 previously proposed by the applicant of the present application. There is a cooling fin protruding from the outer periphery of the. However, since the inside of the silencer is a straight perforated tube portion, it is still difficult to obtain a sufficient silencing effect. Further, the silencer usually has a problem that the muffling effect is lowered when the exhaust efficiency is increased, and the exhaust efficiency is lowered when it is attempted to increase the muffling effect.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention is to provide a silencer capable of enhancing the sound deadening effect without adversely affecting the exhaust efficiency, thereby solving the above-mentioned problems of the prior art.

[0004]

That is, according to the present invention, an outer pipe is fitted on the outer peripheral side of a punching pipe through a sound deadening material, and an exhaust pipe connecting port is provided at a front end and a discharge port is provided at a rear end. In the silencer main body, a required number of partition walls are provided in the silencer main body at appropriate intervals in the axial direction to form an expansion chamber in the silencer main body in front of the partition wall body, and the partition wall body has a front end. A rear portion of a discharge pipe in which a cap is continuously provided via a punching ring is pierced through a central portion of a partition wall fixed to the silencer main body, and a rear end of a partition tube concentrically arranged on the discharge pipe is connected to the partition wall. The gist is a silencer characterized by being fixed.

[0005]

In such a silencer, when the exhaust pipe connecting port is connected to the exhaust pipe connected to the engine, the exhaust gas from the engine is
A part of the exhaust gas flowing into the expansion chamber from the exhaust pipe connection port directly enters the punching ring of the partition wall body and the next expansion chamber from the discharge pipe, but most of the exhaust gas passes so as to surround the cap and forms a partition wall. The space formed by the partition tube has a spiral shape and is buffered by the sound deadening material mainly composed of the partition wall, the partition tube and the silencer, and exhibits a sound deadening effect. Further, since this exhaust gas passes through the exhaust pipe in the center of the partition wall, it is exhausted in a smooth manner, which prevents the exhaust efficiency from being adversely affected.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An illustrated embodiment of the present invention will be described below. In the figure, reference numeral 1 is a cylindrical silencer main body, and a silencer 3 made of glass wool is provided on the outer peripheral side of a punching pipe 2 having innumerable punch holes (not shown) on the entire peripheral surface.
The outer pipe 4 is fitted through the outer pipe 4, and the exhaust pipe connection port 5 is provided at the front end and the discharge port 6 is provided at the rear end. In the silencer main body 1, a required number of partition walls 7 to 7 are provided at appropriate intervals in the axial direction. These partition bodies 7
7 to 7, a conical cap 10 is continuously provided at the front end of the discharge pipe 8 via a punching ring 9, and a rear portion of the discharge pipe 8 is provided at a central portion of the partition wall 11 so as to be relatively outside the discharge pipe 8. A small-diameter and long-length partition 12 and a relatively large-diameter and short-length partition 13 are arranged concentrically, and these partition 1
The rear ends 2 and 13 are fixed to the partition wall 12, and the partition wall 11 of this partition wall body 7 is fixed to the punching pipe 2 of the silencer main body 1, and the partition walls 11 to 11 in the silencer main body 1 are fixed.
The expansion chambers 14-14 are formed in the front.

In the silencer of this embodiment, the exhaust gas from the engine is indicated by the arrow in FIG. 1 when the exhaust pipe 15 connected to the engine is connected to the exhaust pipe connecting port 5. As described above, the exhaust gas flows into the expansion chamber 14 immediately after it from the exhaust pipe connection port 5, and a part of the exhaust gas directly enters the next expansion chamber 14 from the punching ring 9 through the exhaust pipe 8, but most of the exhaust gas. Passing through so as to surround the partition wall 11 and the partition tube 1
The space formed by 2 and 13 has a spiral shape, and the partition wall 1
1, buffering the silencing material 3 in the partition tubes 12 and 13 and the expansion chamber 14 to exert a silencing effect. Then, in the case of this example, the exhaust gas that has passed through the exhaust pipe 8 is further discharged from the exhaust port 6 to the outside in the next expansion chamber 14 and the last expansion chamber 14 through the same process as described above. Further, since this exhaust gas passes through the exhaust pipe 8 in the center of the partition wall 11, it is exhausted smoothly so that the exhaust efficiency is prevented from being adversely affected. In the above example, the case where three partition walls 7 are provided is shown. However, when an appropriate noise reduction effect can be obtained depending on the engine displacement, etc., it is preferable that the number of partition walls 7 is smaller from the viewpoint of exhaust efficiency.

[0008]

As described above, according to the present invention, when used, exhaust gas expands in the expansion chamber in front of the partition body disposed in the silencer main body, and is formed into a spiral shape by the partition wall and the partition tube of the partition body. The effect is that the exhaust gas can be effectively buffered, and the sound deadening effect can be exerted. Moreover, the exhaust gas passes through the exhaust pipe in the center of the partition wall and is exhausted smoothly so that the exhaust efficiency is not adversely affected. There is.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view of a partition body of the above example.

[Explanation of symbols]

 1 Silencer Main Body 2 Punching Pipe 3 Sound Absorbing Material 4 Outer Wall 5 Exhaust Pipe Connection Port 6 Discharge Port 7 Partition Wall 8 Discharge Pipe 9 Punching Ring 10 Cap 11 Partition Wall 12 Separation Tube 13 Separation Tube 14 Expansion Chamber

Claims (1)

[Scope of utility model registration request] 1. A silencer main body, in which an outer pipe is fitted on the outer peripheral side of a punching pipe via a sound deadening material, and an exhaust pipe connecting port is provided at a front end and a discharge port is provided at a rear end. A required number of partition walls are provided at appropriate intervals in the axial direction to form an expansion chamber in the silencer main body in front of the partition walls, and the partition walls continuously connect a cap to the front end through a punching ring. The silencer characterized in that the rear portion of the discharge pipe is penetrated through the central portion of the partition wall fixed mainly to the silencer, and the rear end of a partition tube arranged concentrically with the discharge pipe is fixed to the partition wall. -.