Engine muffler
First Claim
1. An engine muffler comprising:
- a cylindrical muffler body; and
at least one partition plate partitioning an interior of the muffler body in a longitudinal direction of the muffler body into a plurality of expansion chambers, the muffler body being constructed of a plurality of divided muffler body members divided from each other in the longitudinal direction at a position of the partition plate, a gap being provided between opposed end portions of the plurality of divided muffler body members,the partition plate having an annular section held in fitting engagement with an inner peripheral surface of at least one of the opposed end portions of the plurality of divided muffler body members, the partition plate being disposed in such a manner as to close the gap,the opposed end portions of the plurality of divided muffler body members being welded, from a radially outward direction of the muffler body, to an outer peripheral surface of the annular section along respective entire perimeters thereof,wherein the annular section has a flat flange portion formed integrally with and along an entire perimeter of an outer peripheral portion of the annular section to extend radially outward from a distal end of the outer peripheral portion of the annular section through the gap, and a cylindrical extension portion extending in an axial direction of the annular section from a radially outward end of the flange portion,wherein the extension portion is located opposite from the outer peripheral portion across the flange portion and has an inner peripheral surface held in fitting engagement with an outer peripheral surface of other of the opposed end portions, andwherein the opposed end portions of the divided muffler body members are welded, from the radially outward direction, to the outer peripheral surface of the annular section along the respective entire perimeters by the one of the opposed end portions being welded, from the radially outward direction, to the flange portion along the entire perimeter thereof and by the other of the opposed end portions being welded, from the radially outward direction, to a distal end of the extension portion along the entire perimeter thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
An engine muffler includes a cylindrical muffler body whose interior is partitioned by at least one partition plate in a longitudinal direction of the muffler body into a plurality of expansion chambers. The muffler body is constructed of a plurality of divided muffler body members divided from each other in the longitudinal direction at the position of the partition plate, and a gap is provided between opposed end portions of the divided muffler body members. The partition plate has an annular section held in fitting engagement with the inner peripheral surface of at least one of the opposed end portions, and it is positioned in such a manner as to close the gap. The opposed end portions are welded, from a radially outward direction, to the outer peripheral surface of the annular section along their respective entire perimeters.
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Citations
3 Claims
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1. An engine muffler comprising:
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a cylindrical muffler body; and at least one partition plate partitioning an interior of the muffler body in a longitudinal direction of the muffler body into a plurality of expansion chambers, the muffler body being constructed of a plurality of divided muffler body members divided from each other in the longitudinal direction at a position of the partition plate, a gap being provided between opposed end portions of the plurality of divided muffler body members, the partition plate having an annular section held in fitting engagement with an inner peripheral surface of at least one of the opposed end portions of the plurality of divided muffler body members, the partition plate being disposed in such a manner as to close the gap, the opposed end portions of the plurality of divided muffler body members being welded, from a radially outward direction of the muffler body, to an outer peripheral surface of the annular section along respective entire perimeters thereof, wherein the annular section has a flat flange portion formed integrally with and along an entire perimeter of an outer peripheral portion of the annular section to extend radially outward from a distal end of the outer peripheral portion of the annular section through the gap, and a cylindrical extension portion extending in an axial direction of the annular section from a radially outward end of the flange portion, wherein the extension portion is located opposite from the outer peripheral portion across the flange portion and has an inner peripheral surface held in fitting engagement with an outer peripheral surface of other of the opposed end portions, and wherein the opposed end portions of the divided muffler body members are welded, from the radially outward direction, to the outer peripheral surface of the annular section along the respective entire perimeters by the one of the opposed end portions being welded, from the radially outward direction, to the flange portion along the entire perimeter thereof and by the other of the opposed end portions being welded, from the radially outward direction, to a distal end of the extension portion along the entire perimeter thereof.
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2. An engine muffler comprising:
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a cylindrical muffler body; and at least one partition plate partitioning an interior of the muffler body in a longitudinal direction of the muffler body into a plurality of expansion chambers, the muffler body being constructed of a plurality of divided muffler body members divided from each other in the longitudinal direction at a position of the partition plate, a gap being provided between opposed end portions of the plurality of divided muffler body members, the partition plate having an annular section held in fitting engagement with an inner peripheral surface of at least one of the opposed end portions of the plurality of divided muffler body members, the partition plate being disposed in such a manner as to close the gap, the opposed end portions of the plurality of divided muffler body members being welded, from a radially outward direction of the muffler body, to an outer peripheral surface of the annular section along respective entire perimeters thereof, wherein the annular section has a flat flange portion formed integrally with and along an entire perimeter of an outer peripheral portion of the annular section to extend radially outward from a distal end of the outer peripheral portion of the annular section through the gap, wherein the flat flange portion has a first surface and a second surface opposite to the first surface, the first surface being spaced from the one of the opposed end portions of the divided muffler body members in the longitudinal direction of the muffler body, the second surface being in contact with the other of the opposed end portions of the divided muffler body members, and wherein the opposed end portions of the divided muffler body members are welded to the outer peripheral surface of the annular section along the respective entire perimeters by being welded, from the radially outward direction, to the flange portion along the respective entire perimeters thereof.
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3. An engine muffler comprising:
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a cylindrical muffler body; and at least one partition plate partitioning an interior of the muffler body in a longitudinal direction of the muffler body into a plurality of expansion chambers, the muffler body being constructed of a plurality of divided muffler body members divided from each other in the longitudinal direction at a position of the partition plate, a gap being provided between opposed end portions of the plurality of divided muffler body members, the partition plate having an annular section held in fitting engagement with an inner peripheral surface of at least one of the opposed end portions of the plurality of divided muffler body members, the partition plate being disposed in such a manner as to close the gap, the opposed end portions of the plurality of divided muffler body members being welded, from a radially outward direction of the muffler body, to an outer peripheral surface of the annular section along respective entire perimeters thereof, wherein the plurality of expansion chambers comprise first, second and third expansion chambers sequentially arranged in the longitudinal direction, and the at least one partition plate comprises first and second partition plates, the first partition plate partitioning between the first expansion chamber and the second expansion chamber, the second partition plate partitioning between the second expansion chamber and the third expansion chamber, and wherein the engine muffler further comprises a communication pipe extending between the first partition plate and the second partition plate, the communication pipe having a catalyst layer provided therein and having a longitudinally-halfway portion communicating with the second expansion chamber, the communication pipe having one end portion communicating with the first expansion chamber and joined to the first partition plate along an entire perimeter thereof, the communication pipe having another end portion slidably fitted in a through-hole formed in the second partition plate, the communication pipe being slidably movable relatively to the second partition plate to accommodate a difference in thermal expansion in the longitudinal direction of the muffler body between the communication pipe and the divided muffler body members, and the other end portion of the communication pipe and the through-hole being covered with a cap from a side of the third expanded chamber, the cap being joined to the second partition plate in a sealed condition.
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Specification