Compact muffler

Claim 2

A muffler comprising an elongated shell having an inlet at one end and an outlet at the other end, gas passage conduit structure in the shell providing a retroverted three pass gas path connecting the inlet and outlet, partition means in the shell providing a resonator chamber adjacent an end of the shell, a tuning tube located inside one of the three passes and opening into said resonator chamber, and support means supporting the tubing tube inside said one pass and providing for gas flow through the pass outside the tuning tube.

Claim 3

A muffler as set forth in claim 1 wherein said resonator chamber is located adjacent the outlet end of the muffler and said tuning tube is inside the inlet pass.

Claim 4

A muffler as set forth in claim 1 including predetermined area bleed-off means in the conduit structure adjacent the inlet end of the shell providing for bypassing of gas by the first pass.

Claim 5

A muffler as set forth in claim 1 including means providing a sound attenuating chamber around the third pass adjacent the outlet end of the muffler, and predetermined area bleed-off means connecting said sound attenuating chamber to said outlet.

Claim 6

A muffler as set forth in claim 4 wherein said sound attenuating chamber is located within said resonator chamber.

Claim 7

A muffler comprising an elongated shell having an inlet header at one end and an outlet header at the other end, first and second transverse partitions in the shell located adjacent the inlet end and defining a first chamber at the inlet eNd and a second chamber adjacent the first chamber, an inlet bushing supported in the inlet header and the first partition and opening into the second chamber, an inlet gas flow tube telescoped inside the inlet bushing and extending through the second chamber, support means for the inlet tube supporting it inside the bushing, said support means providing a predetermined open area for gas in the bushing to flow around the inlet tube into the second chamber, an outlet bushing in the outlet header, and an outlet gas flow tube connecting the second chamber to the outlet bushing.

Claim 8

A muffler comprising an elongated shell having an inlet header at one end and an outlet header at the other end, first and second transverse partitions in the shell located adjacent the inlet end and defining a first chamber at the inlet eNd and a second chamber adjacent the first chamber, an inlet bushing supported in the inlet header and the first partition and opening into the second chamber, an inlet gas flow tube telescoped inside the inlet bushing and extending through the second chamber, support means for the inlet tube supporting it inside the bushing, said support means providing a predetermined open area for gas in the bushing to flow around the inlet tube into the second chamber, an outlet bushing in the outlet header, and an outlet gas flow tube connecting the second chamber to the outlet bushing.

Claim 9

A muffler as set forth in claim 6 wherein said outlet tube is telescoped inside the outlet bushing, and second support means supporting the outlet tube inside the outlet bushing and including an open area for gas to flow out of the bushing on the outside of the outlet tube.

Claim 10

A muffler as set forth in claim 6 wherein the second partition defines one side of a third chamber, and a spit chamber shell mounted on the inlet tube and extending through said second partition into said second and third chambers.

Claim 11

A muffler as set forth in claim 8 including a third transverse partition acting with the second partition to define said third chamber, and a fourth partition acting with the third partition to define a fourth chamber and with the outlet header to define a fifth chamber, said outlet tube extending through the third and fourth partitions and being telescoped inside the outlet bushing, and a spit chamber shell mounted on the outlet tube and in the third and fourth chambers and extending into the outlet bushing in the fifth chamber.

Claim 12

A muffler as set forth in claim 9 including second support means supporting the outlet tube inside the outlet bushing, said outlet tube being perforated inside the outlet bushing, said second support means including an open area for gas to flow out of the bushing on the outside of the outlet tube.

Claim 13

A muffler comprising an elongated shell having an inlet header with an inlet at one end and an outlet header with an outlet at the other end, gas passage means connecting the inlet to the outlet and including an outlet bushing in the outlet and an outlet tube in the outlet bushing, said outlet tube opening into and having a perforated area in the outlet bushing, means supporting the outlet tube in the outlet bushing and including an open area for gas to flow out of the bushing on the outside of the outlet tube.

Claim 14

A muffler comprising an elongated shell having an inlet header with an inlet at one end and an outlet header with an outlet at the other end, gas passage means connecting the inlet to the outlet and including an outlet bushing in the outlet and an outlet tube in the outlet bushing, said outlet tube opening into and having a perforated area in the outlet bushing, means supporting the outlet tube in the outlet bushing and including an open area for gas to flow out of the bushing on the outside of the outlet tube.

Claim 15

A muffler comprising an elongated shell having an inlet at one end and an outlet at the other end, partition means in the chamber defining a resonator chamber, gas passage and silencing means in the shell connecting the inlet and outlet and including an elongated gas passage tube, a tuning tube located inside the gas passage tube and opening into the resonator chamber and tuned therewithin to attenuate a predetermined relatively low frequency, and support means supporting the tuning tube inside the gas passage tube and providing for gas flow through the gas passage outside the tuning tube.

Claim 16

A muffler comprising an elongated shell having an inlet at one end and an outlet at the other end, partition means in the chamber defining a resonator chamber, gas passage and silencing means in the shell connecting the inlet and outlet and including an elongated gas passage tube, a tuning tube located inside the gas passage tube and opening into the resonator chamber and tuned therewithin to attenuate a predetermined relatively low frequency, and support means supporting the tuning tube inside the gas passage tube and providing for gas flow through the gas passage outside the tuning tube.

Claim 17

A muffler as set forth in claim 12 wherein said support means comprises band sections severed from the gas passage and providing an opening inside the gas passage tube for gas flow on the outside of the tuning tube.

Claim 18

A muffler as set forth in claim 13 wherein said band sections provide an opening in the gas passage tube connecting the inside of the gas passage tube with the space surrounding the tube.

Claim 19

A muffler as set forth in claim 14 wherein said gas passage tube is perforated adjacent the band sections and including a spit chamber forming shell on the gas passage tube embracing the band sections and perforated tube area.

Claim 20

A muffler as set forth in claim 15 wherein said gas passage tube and the inlet end of said tuning tube are located adjacent and in axial alignment with said shell inlet.