One-piece tube and shell assembly for silencer

Claim 3

A method as set forth in claim 1 including the step of reducing at least one portion of the shell into engagement with the outside of the tube to form a chamber between the shell and tube.

Claim 4

A method as set forth in claim 1 including forming perforations in the bar section.

Claim 5

A one-piece tube-and-shell assembly comprising a shell, a tube inside the shell, said tube and shell having a common longitudinal seam joining their individual side edges together and to each other, a portion of said shell being reduced in diameter to form a joint around the tube and a chamber adjacent the joint, said tube being perforated inside said chamber.

Claim 6

A one-piece tube-and-shell assembly comprising a shell, a tube inside the shell, said tube and shell having a common longitudinal seam joining their individual side edges together and to each other, a portion of said shell being reduced in diameter to form a joint around the tube and a chamber adjacent the joint, said tube being perforated inside said chamber.

Claim 7

A one-piece tube-and-shell assembly comprising a shell, a tube inside the shell, said tube and shell having a common longitudinal seam joining their individual side edges together and to each other, the opposite ends of said shell being reduced in diameter to form a gastight joint with the tube at each end of the shell, said tube being perforated inside the shell.

Claim 8

A one-piece tube-and-shell assembly comprising a shell, a tube inside the shell, said tube and shell having a common longitudinal seam joining their individual side edges together and to each other, the opposite ends of said shell being reduced in diameter to form a gastight joint with the tube at each end of the shell, said tube being perforated inside the shell.

Claim 9

A sound-attenuating muffler for flowing gas such as the exhaust gas of an internal-combustion engine which comprises a housing having an inlet and outlet, gas flow and silencing structure inside the housing connecting the inlet and outlet and including a chamber, and a one-piece tube-and-shell assembly in said structure having a shell with a tube inside and joined to the shell in a common seam, said assembly being in gas flow communication with said chamber, said assembly including perforations in that portion of the tube located inside the shell, said shell having a reduced diameter portion forming a wall extending between the shell and the tube.

Claim 10

A sound-attenuating muffler for flowing gas such as the exhaust gas of an internal-combustion engine which comprises a housing having an inlet and outlet, gas flow and silencing structure inside the housing connecting the inlet and outlet and including a chamber, and a one-piece tube-and-shell assembly in said structure having a shell with a tube inside and joined to the shell in a common seam, said assembly being in gas flow communication with said chamber, said assembly including perforations in that portion of the tube located inside the shell, said shell having a reduced diameter portion forming a wall extending between the shell and the tube.

Claim 11

A muffler as set forth in claim 6 wherein said wall is located intermediate the ends of the shell and said tube has perforations on both sides of the wall, the opposite ends of said shell being open.

Claim 12

A muffler as set forth in claim 6 wherein said wall is at one end of the shell, the other end of the shell being open and opening into said chamber so that the shell acts as a tuning passage connecting the chamber to the perforations.

Claim 13

A sound-attenuating muffler for flowing gas such as the exhaust gas of an internal-combustion engine which comprises a housing having an inlet and outlet, gas flow and silencing structure inside the housing connecting the inlet and outlet and including a chamber, and a one-piece tube-and-shell assembly in said structure having a shell with a tube inside and joined to the shell in a common seam, said assembly being in gas flow communication with said chamber, said structure including second and third chambers locatEd adjacent the first mentioned chamber, said tube and shell each being open at opposite ends, one end of each of the tube and shell opening into the first chamber, the other end of the shell opening into the second chamber and the other end of the tube opening into the third chamber.

Claim 14

A sound-attenuating muffler for flowing gas such as the exhaust gas of an internal-combustion engine which comprises a housing having an inlet and outlet, gas flow and silencing structure inside the housing connecting the inlet and outlet and including a chamber, and a one-piece tube-and-shell assembly in said structure having a shell with a tube inside and joined to the shell in a common seam, said assembly being in gas flow communication with said chamber, said structure including second and third chambers locatEd adjacent the first mentioned chamber, said tube and shell each being open at opposite ends, one end of each of the tube and shell opening into the first chamber, the other end of the shell opening into the second chamber and the other end of the tube opening into the third chamber.

Claim 15

A muffler as set forth in claim 9 wherein the lengths and areas of the shell and tubes and the volumes of the second and third chambers are interrelated so that the second and third chambers are tuned to attenuate predetermined frequencies.

Claim 16

A sound-attenuating muffler for flowing gas such as the exhaust gas of an internal-combustion engine which comprises a housing having an inlet and outlet, gas flow and silencing structure inside the housing connecting the inlet and outlet and including a chamber, and a one-piece tube-and-shell assembly in said structure having a shell with a tube inside and joined to the shell in a common seam, said assembly being in gas flow communication with said chamber, said tube forming a part of the path for gas flow through the muffler, said shell being connected at opposite ends to said tube to form a closed chamber around said tube, said tube being perforated inside said closed chamber whereby said closed chamber comprises a high-frequency noise-attenuating chamber.

Claim 17

A sound-attenuating muffler for flowing gas such as the exhaust gas of an internal-combustion engine which comprises a housing having an inlet and outlet, gas flow and silencing structure inside the housing connecting the inlet and outlet and including a chamber, and a one-piece tube-and-shell assembly in said structure having a shell with a tube inside and joined to the shell in a common seam, said assembly being in gas flow communication with said chamber, said tube forming a part of the path for gas flow through the muffler, said shell being connected at opposite ends to said tube to form a closed chamber around said tube, said tube being perforated inside said closed chamber whereby said closed chamber comprises a high-frequency noise-attenuating chamber.

Claim 18

A sound-attenuating muffler for flowing gas such as the exhaust gas of an internal-combustion engine which comprises a housing having an inlet and outlet, gas flow and silencing structure inside the housing connecting the inlet and outlet and including a chamber, and a one-piece tube-and-shell assembly in said structure having a shell with a tube inside and joined to the shell in a common seam, said assembly being in gas flow communication with said chamber, said tube being longer than said shell, said shell and tube being formed from a blank having a bar section and a stem section.

Claim 19

A sound-attenuating muffler for flowing gas such as the exhaust gas of an internal-combustion engine which comprises a housing having an inlet and outlet, gas flow and silencing structure inside the housing connecting the inlet and outlet and including a chamber, and a one-piece tube-and-shell assembly in said structure having a shell with a tube inside and joined to the shell in a common seam, said assembly being in gas flow communication with said chamber, said tube being longer than said shell, said shell and tube being formed from a blank having a bar section and a stem section.