Muffler

Abstract

The present disclosure provides a muffler with a simple structure and a low cost. The muffler is formed by an exhaust pipe. The exhaust pipe has an extension direction and a radial direction, an exhaust gas is discharged through the exhaust pipe. At least a partial region of an interior of the exhaust pipe is divided into a muffling chamber and an exhaust passage portion by a partition plate arranged along the extension direction. A cross-sectional area of the exhaust passage portion is larger than that of the muffling chamber. At a downstream end portion of the muffling chamber in a flow direction of the exhaust gas, a peripheral wall of the exhaust pipe on the muffler chamber side is engaged with the partition plate, thereby closing a downstream opening of the muffling chamber in the flow direction of the exhaust gas.

1 . A muffler, wherein, the muffler is formed by an exhaust pipe for discharging an exhaust gas,
 the exhaust pipe having an extension direction and a radial direction, at least a partial region of an interior of the exhaust pipe being divided into a muffling chamber and an exhaust passage portion by a partition plate arranged along the extension direction,   at a downstream end portion of the muffling chamber in a flow direction of the exhaust gas, a peripheral wall of the exhaust pipe on the muffler chamber side being crimped and deformed toward the partition plate to engage with the partition plate, thereby closing a downstream opening of the muffling chamber in the flow direction of the exhaust gas, wherein the crimped and deformed peripheral wall forms a protruding part.   
     
     
         2 . The muffler according to  claim 1 , wherein the exhaust pipe is a straight pipe. 
     
     
         3 . The muffler according to  claim 1 , wherein the exhaust pipe is a bent pipe with at least one bent portion. 
     
     
         4 . The muffler according to  claim 3 , wherein the muffling chamber is located at least at the bent portion. 
     
     
         5 . The muffler according to  claim 1 , wherein when viewed from a downstream side in the flow direction of the exhaust gas, the peripheral wall of the exhaust pipe on the muffling chamber side is engaged with the partition plate to form a T-shaped engagement portion. 
     
     
         6 . The muffler according to  claim 1 , wherein at the downstream end portion of the muffling chamber, the peripheral wall of the exhaust pipe on the muffling chamber side and the partition plate are welded to each other by melt inert-gas welding. 
     
     
         7 . The muffler according to  claim 1 , wherein at the downstream end portion of the muffling chamber, the peripheral wall of the exhaust pipe on the muffling chamber side is crimped inward in the radial direction to engage with the partition plate. 
     
     
         8 . The muffler according to  claim 1 , wherein at the downstream end portion of the muffling chamber, the partition plate is bent outward in the radial direction to engage with the peripheral wall of the exhaust pipe on the muffling chamber side. 
     
     
         9 . The muffler according to  claim 1 , wherein a cover is provided at the downstream end portion of the muffling chamber to cover the downstream end portion. 
     
     
         10 . The muffler according to  claim 1 , wherein the partition plate has bent portions at both end sides in a width direction perpendicular to the extension direction, wherein the bent portions are welded to the exhaust pipe by laser welding. 
     
     
         11 . A muffler, wherein the muffler is formed by an exhaust pipe for discharging an exhaust gas,
 the exhaust pipe having an extension direction and a radial direction, at least a partial region of an interior of the exhaust pipe being divided into a muffling chamber and an exhaust passage portion by a partition plate arranged along the extension direction,   a cross-sectional area of the exhaust passage portion being larger than a cross-sectional area of the muffling chamber, and   a cover being provided at a downstream end portion of the exhaust pipe in a flow direction of the exhaust gas to cover the downstream end portion, and a part of the cover being in close contact with or engaged with the partition plate to close a downstream opening of the muffling chamber in the flow direction of the exhaust gas.   
     
     
         12 . The muffler according to  claim 1 , wherein a cross-sectional area of the exhaust passage portion is larger than a cross-sectional area of the muffling chamber.