Tuning tube

Claim 2

An exhaust gas muffler for internal combustion engines comprising: an elongated shell having an inlet at one end and an outlet at the other end and gas passage means connecting the inlet and outlet; a transverse partition means inside the shell subdividing it into first and second longitudinally adjacent chambers; said partition means including a wall member and a passage defining member secured to the wall member; said partition means further including a lengthy tubular passage formed in part by said wall member and in part by said passage defining member and opening only into one of the chambers whereby the passage serves as a quarter wave length tuner; the centerline of said passage being substantially parallel to the plane of the wall member.

Claim 3

A sound attenuating muffler for flowing gases comprising a housing having an inlet and an outlet, gas passage means in the housing connecting the inlet and outlet, partition means in the housing defining a resonator chamber and including a flat wall defining one side of said chamber; said wall having an opening in it; said chamber being completely closed except for said opening, a channel secured to the wall so that the wall closes the open face of the channel and the combined wall and channel define a tuning passage; one end of the channel being closed and the channel having an outlet; said channel embracing said wall opening and the closed end of the channel being located adjacent said wall opening, the outlet of the channel being located in said resonator chamber; said tuning passage being closed except for said opening and said outlet and the length and area of said passage being selected in relation to the volume of the resonator chamber so that the tuning passage and resonator chamber are tuned to attenuate a predetermined frequency of sound vibration.

Claim 4

A sound attenuating muffler for flowing gases comprising a housing having an inlet and an outlet, gas passage means in the housing connecting the inlet and outlet, partition means in the housing defining a resonator chamber and including a flat wall defining one side of said chamber; said wall having an opening in it; said chamber being completely closed except for said opening, a channel secured to the wall so that the wall closes the open face of the channel and the combined wall and channel define a tuning passage; one end of the channel being closed and the channel having an outlet; said channel embracing said wall opening and the closed end of the channel being located adjacent said wall opening, the outlet of the channel being located in said resonator chamber; said tuning passage being closed except for said opening and said outlet and the length and area of said passage being selected in relation to the volume of the resonator chamber so that the tuning passage and resonator chamber are tuned to attenuate a predetermined frequency of sound vibration.

Claim 5

A muffler as set forth in claim 2 wherein said channel has an open end forming said outlet.

Claim 6

An exhaust gas muffler for internal combustion engines comprising: an elongated shell having an inlet at one end aNd an outlet at the other end and gas passage means connecting the inlet and outlet; a transverse partition means inside the shell subdividing it into first and second longitudinally adjacent chambers; the second of said chambers comprising a closed resonator chamber isolated from said gas passage means; said partition means including a wall member separating said chambers and a passage defining member secured to the wall member; said partition means further including a lengthy tubular passage formed in part by said wall member and in part by said passage defining member; the centerline of said passage being substantially parallel to the plane of the wall member; said wall having an opening into said passage; said passage having an opening into the second of said chambers whereby said passage interconnects said chambers; the length and area of said passage and the volume of the second chamber being interrelated to tune them to attenuate a preselected frequency.

Claim 7

An exhaust gas muffler for internal combustion engines comprising: an elongated shell having an inlet at one end aNd an outlet at the other end and gas passage means connecting the inlet and outlet; a transverse partition means inside the shell subdividing it into first and second longitudinally adjacent chambers; the second of said chambers comprising a closed resonator chamber isolated from said gas passage means; said partition means including a wall member separating said chambers and a passage defining member secured to the wall member; said partition means further including a lengthy tubular passage formed in part by said wall member and in part by said passage defining member; the centerline of said passage being substantially parallel to the plane of the wall member; said wall having an opening into said passage; said passage having an opening into the second of said chambers whereby said passage interconnects said chambers; the length and area of said passage and the volume of the second chamber being interrelated to tune them to attenuate a preselected frequency.

Claim 8

A muffler as set forth in claim 4 wherein said passage defining member comprises; a channel shaped part attached to said transverse partition; said channel having a closed end adjacent the wall opening and the other end of the channel being open to form the opening into the second chamber.