Exhaust muffler

Patent metadata

Field	Value
Publication number	US-2016245146-A1
Application number	US-201615002779-A
Country	US
Kind code	A1
Filing date	Jan 21, 2016
Priority date	Feb 23, 2015
Publication date	Aug 25, 2016
Grant date	—

Abstract

In an exhaust muffler using a double communicating tube as a communicating tube between expansion chambers, the exhaust muffler controls exhaust gas so as not to flow directly between intake and exhaust ports of an inner communicating tube and an outer communicating tube to thereby utilize the volume of the expansion chamber sufficiently. On one end side of the double communicating tube facing into a second expansion chamber, a distal end opening of the inner communicating tube functions as an intake port of an inside passage. A closing member for closing an end in the axial direction of an annular passage is provided in or in the vicinity of a distal end opening of the outer communicating tube. An exhaust port for opening the annular passage outwardly in the radial direction is provided between the closing member of the outer communicating tube and a first partition wall.

First claim

What is claimed is:

1 . An exhaust muffler comprising:
a cylindrical body; a partition wall partitioning an interior of the cylindrical body into a plurality of expansion chambers; and a communicating tube passing through the partition wall, wherein the communicating tube is in the form of a double communicating tube formed of an outer communicating tube and an inner communicating tube, and an inside passage within the inner communicating passage and an annular passage between the inner communicating tube and the outer communicating tube function as exhaust passages through which exhaust gases flow in opposite directions to each other; wherein on one end side of the double communicating tube faces into one of the expansion chambers with a distal end opening of the inner communicating tube functioning as an intake and exhaust port of the inside passage; and wherein a closing portion for closing an end in the axial direction of the annular passage is provided in or in the vicinity of a distal end opening of the outer communicating tube, and an outer circumferential intake and exhaust port for opening the annular passage outwardly in a radial direction is provided between the closing portion of the outer communicating tube and the partition wall.

2 . The exhaust muffler according to claim 1 , wherein on the one end side of the double communicating tube, the distal end opening of the inner communicating tube functions as an intake port, and the outer circumferential intake and exhaust port functions as an exhaust port.

3 . The exhaust muffler according to claim 1 , wherein the closing portion is provided with a closing member of a plate shape for intersecting with an axial direction of the double communicating tube, and the closing member is arranged closer to the distal end opening of the outer communicating tube than the partition wall.

4 . The exhaust muffler according to claim 2 , wherein the closing portion is provided with a closing member of a plate shape for intersecting with an axial direction of the double communicating tube, and the closing member is arranged closer to the distal end opening of the outer communicating tube than the partition wall.

5 . The exhaust muffler according to claim 1 , wherein the outer circumferential intake and exhaust port are arranged to be offset toward the partition wall between the closing portion and the partition wall.

6 . The exhaust muffler according to claim 2 , wherein the outer circumferential intake and exhaust port are arranged to be offset toward the partition wall between the closing portion and the partition wall.

7 . The exhaust muffler according to claim 3 , wherein the outer circumferential intake and exhaust port are arranged to be offset toward the partition wall between the closing portion and the partition wall.

8 . The exhaust muffler according to claim 1 , wherein on the other end side of the double communicating tube facing into the other expansion chamber partitioned from the one expansion chamber by the partition wall, an end portion of the outer communicating tube is supported on an opposed wall located on the opposite side of the other expansion chamber from the partition wall.

9 . The exhaust muffler according to claim 2 , wherein on the other end side of the double communicating tube facing into the other expansion chamber partitioned from the one expansion chamber by the partition wall, an end portion of the outer communicating tube is supported on an opposed wall located on the opposite side of the other expansion chamber from the partition wall.

10 . The exhaust muffler according to claim 8 , and further comprising a second closing portion closing the distal end opening of the outer communicating tube located on the opposed wall side, and a second outer circumferential intake and exhaust port for opening the annular passage outwardly in the radial direction, wherein the second closing portion is formed in the opposed wall, and the second outer circumferential intake and exhaust port is provided in the end portion of the outer communicating tube located on the opposed wall side.

11 . The exhaust muffler according to claim 8 , wherein an end portion of the inner communicating tube located on the opposed wall side is supported on the opposed wall, and an end of the inner communicating tube located on the partition wall side is supported through the closing portion on the outer communicating tube.

12 . The exhaust muffler according to claim 10 , wherein an end portion of the inner communicating tube located on the opposed wall side is supported on the opposed wall, and an end of the inner communicating tube located on the partition wall side is supported through the closing portion on the outer communicating tube.

13 . The exhaust muffler according to claim 1 , and further comprising another tube which passes through the partition wall and is arranged below the double communicating tube, wherein the double communicating tube has the inner communicating tube of a circular cross section and the outer communicating tube of a non-circular cross section, and the outer communicating tube has a cross sectional shape of which a height dimension in a vertical direction is smaller than a width dimension in a horizontal direction.

14 . The exhaust muffler according to claim 2 , and further comprising another tube which passes through the partition wall and is arranged below the double communicating tube, wherein the double communicating tube has the inner communicating tube of a circular cross section and the outer communicating tube of a non-circular cross section, and the outer communicating tube has a cross sectional shape of which a height dimension in a vertical direction is smaller than a width dimension in a horizontal direction.

15 . An exhaust muffler comprising:
a body; a partition wall partitioning an interior of the body into a plurality of expansion chambers; and an outer communicating tube and an inner communicating tube passing through the partition wall wherein an inside passage within the inner communicating passage and an annular passage between the inner communicating tube and the outer communicating tube function as exhaust passages through which exhaust gases flow in opposite directions to each other; one end side of the double communicating tube faces into one of the expansion chambers with a distal end opening of the inner communicating tube functioning as an intake and exhaust port of the inside passage; and a closing portion for closing an end in the axial direction of the annular passage, said closing portion being provided in or in the vicinity of a distal end opening of the outer communicating tube, and an outer circumferential intake and exhaust port for opening the annular passage outwardly in a radial direction is provided between the closing portion of the outer communicating tube and the partition wall.

16 . The exhaust muffler according to claim 15 , wherein on the one end side of the outer and inner communicating tube, the distal end opening of the inner communicating tube functions as an intake port, and the outer circumferential intake and exhaust port functions as an exhaust port.

17 . The exhaust muffler according to claim 15 , wherein the closing portion is provided with a closing member of a plate shape for intersecting with an axial direction of the double communicating tube, and the closing member is arranged closer to the distal end opening of the outer communicating tube than the partition wall.

18 . The exhaust muffler according t

Assignees

• Honda Motor Co Ltd

Inventors

• Hayama Yoshitaka

Classifications

• F01N1/089

  using two or more expansion chambers in series (F01N1/083, F01N1/084, F01N1/086 take precedence) · CPC title

• F01N13/007 Primary

  Apparatus used as intake or exhaust silencer · CPC title

• F01N2490/06

  the gases flowing longitudinally from inlet to outlet in opposite directions · CPC title

• F01N2470/24

  Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled · CPC title

• F01N2470/04

  characterised by shape, disposition or dimensions of apertures · CPC title