JPH0583311U - Silencer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a silencer capable of enhancing the silencing effect without adversely affecting the exhaust efficiency. A silencer main body 1 in which an outer pipe 4 is fitted on the outer peripheral side of a punching pipe 2 via a sound deadening material 3, and an exhaust pipe connecting port 5 is provided at a front end and a discharge port 6 is provided at a rear end, The silencer main body 1 is provided with a required number of partition walls 7 at appropriate intervals in the axial direction.
Forming an expansion chamber 14 in the silencer main body 1 in front of
The partition body 7 has a rear end of a discharge pipe 8 in which a cap 10 is continuously provided via a punching ring 9 at the front end, and extends through a central portion of a partition wall 11 fixed to the silencer main body 1, and is concentric with the discharge pipe 8. A silencer characterized in that the rear ends of the partition tubes 12 and 13 arranged in the above are fixed to the partition wall 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a silencer attached to the end portion of an exhaust pipe of an engine.

[0002]

[Prior Art]

 Conventionally, a silencer is provided with an outer tube on the outer circumference of a perforated tube portion via a sound absorbing material, as shown in, for example, Japanese Utility Model Application Laid-Open No. 59-165 520 previously proposed by the applicant of the present application, and the outer tube is provided on the outer circumference thereof. Some have cooling fins protruding. 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 when the exhaust efficiency is increased, the muffling effect is lowered, and when the muffling effect is attempted, the exhaust efficiency is lowered.

[0003]

[Problems to be solved by the device]

 Therefore, the present invention provides a silencer capable of enhancing the sound deadening effect without adversely affecting the exhaust efficiency, thereby attempting to solve the above-mentioned problems of the prior art.

[0004]

[Means for Solving the Problems]

 That is, the present invention is a silencer 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 the front end and a discharge port is provided at the rear end. -A required number of partition bodies are provided in the main body at appropriate intervals in the axial direction, and a silencer is provided in front of the partition body to form an expansion chamber, and the partition body has a cap at its front end through a punching ring. The rear portion of the discharge pipe continuously connected to the silencer is penetrated through the central portion of the partition wall fixed to the silencer main body, and the rear end of a partition tube arranged concentrically with the discharge pipe is fixed to the partition wall. The silencer is the main point.

[0005]

[Action]

 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 flows into the expansion chamber through the exhaust pipe connecting port, and Part of the exhaust gas enters the next expansion chamber directly from the punching ring of the partition wall and the exhaust pipe, but most of it passes through so as to surround the cap, and becomes a spiral in the space formed by the partition wall and the partition tube. , Sieves and silencers are used as cushioning materials to exert a sound deadening effect. Further, since this exhaust gas passes through the exhaust pipe at the center of the partition wall, it is exhausted in a smooth manner, which prevents the exhaust efficiency from being adversely affected.

[0006]

【Example】

 Next, an illustrated embodiment of the present invention will be described. In the figure, reference numeral 1 is a cylindrical silencer main body, and a silencer 3 made of glass wool is placed on the outer peripheral side of a punching pipe 2 having an innumerable punch holes (not shown) on the entire peripheral surface. The pipe 4 is fitted, 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. In each of the partition walls 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 the rear portion of the discharge pipe 8 is provided so as to penetrate through the central portion of the partition wall 11. A relatively small diameter and long length partition 12 and a relatively large diameter and short length 13 are concentrically arranged on the outer side of 8, and the rear ends of these partitions 12, 13 are fixed to the partition wall 12. The partition wall 11 of the partition wall body 7 is fixed to the punching pipe 2 of the silencer main body 1, and the expansion chambers 14 to 14 are formed in front of the partition walls 11 to 11 in the silencer main body 1, respectively.

In the silencer of this example as described above, when the exhaust pipe connecting port 5 is connected to the exhaust pipe 15 connected to the engine, exhaust gas from the engine is indicated by an arrow in FIG. As shown in the figure, a portion of the exhaust gas that flows into the expansion chamber 14 immediately after it from the exhaust pipe connection port 5 directly enters from the punching ring 9 through the exhaust pipe 8 into the next expansion chamber 14, but most of it is the cap. It passes through so as to surround 10, and becomes a spiral in the space formed by the partition wall 11 and the partition tubes 12 and 13, and buffers the sound deadening material 3 in the partition wall 11, the partition tubes 12 and 13 and the expansion chamber 14 to provide a sound deadening effect. To demonstrate. Then, in the case of this example, the exhaust gas that has passed through the exhaust pipe 8 is further discharged to the outside from the exhaust port 6 through the same process as described above in the next expansion chamber 14 and the last expansion chamber 14. 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., the number of partition walls 7 is preferably as small as possible from the viewpoint of exhaust efficiency.

[0008]

[Effect of the device]

 As described above, in the present invention, the exhaust gas expands in the expansion chamber in front of the partition wall arranged in the silencer main body during use, and becomes a spiral shape due to the partition wall and the partition tube of the partition wall. It is possible to provide a cushioning and noise reduction effect, and since this exhaust gas passes through the exhaust pipe in the center of the partition wall, it is exhausted to the smooth and is not likely to adversely affect the exhaust efficiency. is there.

[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 wall 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 is characterized in that the rear portion of the discharge pipe is penetrated through a central portion of a partition wall fixed to the silencer main body, and the rear end of a partition tube arranged concentrically with the discharge pipe is fixed to the partition wall. -.