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Muffler

A muffler and outer tube technology, which is applied in the direction of mufflers, instruments, sound-generating instruments, etc., can solve the problems of easy deformation of small holes, poor processability, etc., and achieve the improvement of degree of freedom, proper muffler effect, and reduction of outer diameter Effect

Active Publication Date: 2018-06-08
FUTABA IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] As mentioned above, if the inner tube is provided with a plurality of small holes, the small holes are easily deformed when the inner tube is bent. bad question

Method used

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Experimental program
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Effect test

no. 1 approach

[0038] [Structure of the exhaust system]

[0039] figure 1 The illustrated exhaust system 1 includes a catalytic converter 3, a secondary muffler 5, a main muffler 7, and pipes 9A, 9B, and 9C (hereinafter collectively referred to as pipes 9 when no distinction is made between each pipe). It has a structure connected in series. The catalytic converter 3 is a device for purifying exhaust gas, and a catalyst is provided inside the catalytic converter 3 . Both the secondary muffler 5 and the main muffler 7 are devices for reducing exhaust noise. In the above structure, the sub muffler 5 corresponds to an example of the muffler of the present disclosure.

[0040] like Figure 2A as well as Figure 2B As shown, the secondary muffler 5 has an inner pipe 11 and an outer pipe 13 . Both the inner tube 11 and the outer tube 13 are formed in a tubular shape. The inner tube 11 is disposed on the inner peripheral side of the outer tube 13, whereby the inner tube 11 and the outer tub...

no. 2 approach

[0064] Next, a second embodiment will be described. In addition, each embodiment after the second embodiment will be described in detail focusing on the points of difference from the first embodiment. Only the same symbols as in the first embodiment are attached to the same parts as in the first embodiment in the drawings, and detailed description thereof will be omitted.

[0065] Figure 4A The exhaust system 31 shown has a catalytic converter 3, a first sub-muffler 5A, a second sub-muffler 5B, a main muffler 7, and pipes 9A, 9B, 9C, and 9D. structure. That is, the second embodiment differs from the first embodiment in that two sub-mufflers are provided.

[0066] According to the above structure, when air column resonance occurs in the exhaust pipe, even if the first sub-muffler 5A alone cannot cope with the air column resonance, by arranging the second sub-muffler 5B at the position caused by the air column resonance The sound pressure abdomen of the generated standing w...

no. 3 approach

[0068] Next, a third embodiment will be described.

[0069] Figure 4B The illustrated exhaust system 41 includes a catalytic converter 3 , a first sub-muffler 5A, a second sub-muffler 5B, a main muffler 7 , and pipes 9A, 9B, and 9C, and these components have a structure connected in series. The point that two sub-mufflers 5A, 5B are provided is the same as that of the second embodiment.

[0070] However, in the third embodiment, one end of the second sub-muffler 5B is directly connected to the main muffler 7 . In this way, the two ends of the sub-muffler 5 corresponding to the muffler of the present disclosure are not limited to connecting pipe materials, and may be directly connected to various devices that can constitute the exhaust flow path.

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Abstract

A muffler equipped with an inner pipe and an outer pipe which, along with the inner pipe, forms a double-wall pipe, wherein: a cavity is provided between the inner and outer pipes, the interval between the inner and outer pipes at a first end of the double-wall pipe is sealed, the interval between the inner and outer pipes at a second end of the double-wall pipe is open, and the cavity is connected to the exhaust channel via this opening. The cavity is formed as a result of the inner pipe being shaped in a manner such that a section of the outer-circumferential surface of the inner pipe is positioned to the inner-circumferential side relative to a reference, with the reference being the position where the entire outer-circumferential surface of the inner pipe contacts the inner-circumferential surface of the outer pipe.

Description

[0001] Cross References to Related Applications [0002] This international application claims priority from International Patent Application No. PCT / JP2016 / 051710 filed on January 21, 2016, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to mufflers. Background technique [0004] As an exhaust system for automobiles, there is known a system in which a sub-muffler is provided between a catalyst provided on the upstream side of the exhaust flow path and a main muffler provided on the downstream side of the exhaust flow path (for example, refer to Patent Document 1.) . The sub-muffler described in Patent Document 1 has a double pipe composed of an outer pipe and an inner pipe, and the inner pipe is provided with a plurality of small holes. [0005] prior art literature [0006] patent documents [0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2000-154715 Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N1/02F01N13/08
CPCF01N1/02F01N13/08F01N2470/08F01N2470/10F01N2470/24F01N2490/16F01N2490/20G10K11/161G10K11/172F01N1/023
Inventor 东野恒志贝沼克彦三浦岳広户市进之介多和田隼
Owner FUTABA IND CO LTD
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