US4359135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler assembly
Assignee: Donaldson Co Inc
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Filing: 1980-04-21
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Granted: 1982-11-16
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Expires: 2000-04-21
Abstract
Abstract A muffler comprising a housing (12) having end caps (16, 18) and partitions (32, 38, 42) which divide it into first and second expansion chambers (40, 44), a flow chamber (36), and a resonator chamber (34). An inlet tube (20) passes through end cap (16) and partitions (38) and (32) to open into chamber (34): it has perforations (58) and (62) which afford communication with chambers (40) and (36) respectively. An outlet tube (24) passes through end cap (18) and partitions (42) and (32) to open into chamber (36): it has perforations (70) which afford communication with chamber (44), and includes anti-whistle beads (72). A conversion-divergent nozzle (80) is located in tube (22) at its end opening into chamber (36). Apertures (190) are provided to afford limited flow of gas through chamber (34) from tube (20) to chamber (36).
Inventors
- 👤 Wayne M. Wagner
- 👤 David E. Winnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:39
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/02; F01N1/003; F01N1/08; F01N2490/00; F01N2490/15; F01N2490/155; F01N2490/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
184 words
In a muffler, for the output gas of a machine, in combination: a housing; separation means comprising a plurality of partitions dividing said housing into a first expansion chamber, a flow chamber, a resonator chamber, and a second expansion chamber; inlet means comprising a first tube, passing in turn through said first expansion chamber, a partition, said flow chamber, a partition between said flow chamber and said resonator chamber, and opening into said resonator chamber, said first tube being laterally perforated at a first site to enable communication with said first expansion chamber, and at a second site to enable restricted flow of gas into said flow chamber; and outlet means comprising a second tube, opening from said flow chamber and passing through said partition between said flow chamber and said resonator chamber, said resonator chamber, said second expansion chamber and a partition therebetween, said tube being laterally perforated at a first site to enable communication with said second expansion chamber; said partition between said flow chamber and said resonator chamber being apertured to enable limited flow of said gas through said resonator chamber.
Claim 2
Dependent Claim
184 words
In a muffler, for the output gas of a machine, in combination: a housing; separation means comprising a plurality of partitions dividing said housing into a first expansion chamber, a flow chamber, a resonator chamber, and a second expansion chamber; inlet means comprising a first tube, passing in turn through said first expansion chamber, a partition, said flow chamber, a partition between said flow chamber and said resonator chamber, and opening into said resonator chamber, said first tube being laterally perforated at a first site to enable communication with said first expansion chamber, and at a second site to enable restricted flow of gas into said flow chamber; and outlet means comprising a second tube, opening from said flow chamber and passing through said partition between said flow chamber and said resonator chamber, said resonator chamber, said second expansion chamber and a partition therebetween, said tube being laterally perforated at a first site to enable communication with said second expansion chamber; said partition between said flow chamber and said resonator chamber being apertured to enable limited flow of said gas through said resonator chamber.
Claim 3
Dependent Claim
18 words
A muffler according to claim 1 and a nozzle attenuator in said second tube at a second site.
Claim 4
Dependent Claim
44 words
A muffler according to claim 1 in which the ratio of the area of said opening of said inlet means into said resonator chamber to the apertured area in said partition between said flow chamber and said resonator chamber is between 2-to-1 and 4-to-1.
Claim 5
Dependent Claim
42 words
A muffler according to claim 1 in which the ratio of the area of said opening of said inlet means into said resonator chamber to the apertured area in said partition between said flow chamber and said resonator chamber is substantially 2-to-1.
Claim 6
Dependent Claim
221 words
In a muffler: a housing having a longitudinal axis and first and second end caps; a plurality of partitions dividing said housing into a first expansion chamber adjacent said first end cap, a flow chamber adjacent said first expansion chamber, a resonator chamber adjacent said flow chamber, and a second expansion chamber between said resonator chamber and said second end cap; inlet means comprising a first tubular member extending through said first end cap and two of said partitions to project and open into said resonator chamber, said inlet means being laterally apertured at a first site to give communication to said first expansion chamber and at a second site to enable restricted gas flow into said flow chamber; and outlet means comprising a second tubular member extending through said second end cap and two of said partitions to open into said flow chamber, said outlet means being laterally apertured at a first site to give communication to said second expansion chamber; said partition between said flow chamber and said resonator chamber being apertured to enable limited flow of gas from said inlet means through said resonator chamber into said flow chamber, and the ratio of the area of the opening of said inlet means into said resonator chamber to the apertured area of said partition being between 2-to-1 and 4-to-1.
Claim 7
Dependent Claim
221 words
In a muffler: a housing having a longitudinal axis and first and second end caps; a plurality of partitions dividing said housing into a first expansion chamber adjacent said first end cap, a flow chamber adjacent said first expansion chamber, a resonator chamber adjacent said flow chamber, and a second expansion chamber between said resonator chamber and said second end cap; inlet means comprising a first tubular member extending through said first end cap and two of said partitions to project and open into said resonator chamber, said inlet means being laterally apertured at a first site to give communication to said first expansion chamber and at a second site to enable restricted gas flow into said flow chamber; and outlet means comprising a second tubular member extending through said second end cap and two of said partitions to open into said flow chamber, said outlet means being laterally apertured at a first site to give communication to said second expansion chamber; said partition between said flow chamber and said resonator chamber being apertured to enable limited flow of gas from said inlet means through said resonator chamber into said flow chamber, and the ratio of the area of the opening of said inlet means into said resonator chamber to the apertured area of said partition being between 2-to-1 and 4-to-1.
Claim 8
Dependent Claim
13 words
A muffler according to claim 5 in which said ratio is substantially 2-to-1.
Claim 9
Dependent Claim
23 words
A muffler according to claim 5 and a nozzle attenuator in said second tubular member between said first site and said flow chamber.
Claim 10
Dependent Claim
193 words
A muffler for reducing the noise level of gases passing therethrough, comprising: a housing defining an interior space and having an inlet and an outlet; an inlet conduit in fluid communication with said inlet and extending a distance within said interior space for guiding gases into the muffler; an outlet conduit in fluid communication with said outlet and extending a distance within said interior space for guiding gases out of the muffler; partition means for dividing said interior space into a resonator chamber, a flow chamber, and at least one expansion chamber; said inlet conduit having an open end disposed within said resonator chamber and a plurality of flow holes through it for providing fluid communication between said inlet and said flow chamber; said outlet conduit having an open end disposed within said flow chamber for guiding gas from said flow chamber to said outlet; means enabling limited flow of gas through said resonator chamber; and at least one of said inlet and outlet conduits having a plurality of attenuation holes through it for providing fluid communication to said at least one expansion chamber so that broad band sound attenuation can occur therein.
Claim 11
Dependent Claim
193 words
A muffler for reducing the noise level of gases passing therethrough, comprising: a housing defining an interior space and having an inlet and an outlet; an inlet conduit in fluid communication with said inlet and extending a distance within said interior space for guiding gases into the muffler; an outlet conduit in fluid communication with said outlet and extending a distance within said interior space for guiding gases out of the muffler; partition means for dividing said interior space into a resonator chamber, a flow chamber, and at least one expansion chamber; said inlet conduit having an open end disposed within said resonator chamber and a plurality of flow holes through it for providing fluid communication between said inlet and said flow chamber; said outlet conduit having an open end disposed within said flow chamber for guiding gas from said flow chamber to said outlet; means enabling limited flow of gas through said resonator chamber; and at least one of said inlet and outlet conduits having a plurality of attenuation holes through it for providing fluid communication to said at least one expansion chamber so that broad band sound attenuation can occur therein.
Claim 12
Dependent Claim
249 words
A muffler for reducing the noise level of gases passing therethrough, comprising: (a) a housing defining an interior space and having an inlet and an outlet; (b) means in said housing for dividing said interior space into a resonator chamber, a flow chamber, and at least one expansion chamber; (c) means defining a gas flow path between said inlet and said outlet, comprising: (i) inlet conduit means in fluid communication with said inlet and extending a distance within said interior space for guiding gases into the muffler; (ii) an outlet conduit in fluid communication with said outlet and extending a distance within said interior space for guiding gases out of the muffler; (iii) said inlet conduit means having an open end disposed within said resonator chamber and having means providing fluid communication between said inlet and said flow chamber; (iv) said outlet conduit having an opening disposed within said flow chamber for guiding gas from said flow chamber to said outlet; (d) means including aperture means between said resonator chamber and said gas flow path enabling limited flow of gas through said resonator chamber, the ratio of the area of the open end of said inlet means into said resonator chamber to the aperture means being between 2-to-1 and 4-to-1; and (e) at least one of said inlet and outlet conduits having a plurality of attenuation holes through it for providing fluid communication to said at least one expansion chamber so that broad band sound attenuation can occur therein.
Claim 13
Dependent Claim
249 words
A muffler for reducing the noise level of gases passing therethrough, comprising: (a) a housing defining an interior space and having an inlet and an outlet; (b) means in said housing for dividing said interior space into a resonator chamber, a flow chamber, and at least one expansion chamber; (c) means defining a gas flow path between said inlet and said outlet, comprising: (i) inlet conduit means in fluid communication with said inlet and extending a distance within said interior space for guiding gases into the muffler; (ii) an outlet conduit in fluid communication with said outlet and extending a distance within said interior space for guiding gases out of the muffler; (iii) said inlet conduit means having an open end disposed within said resonator chamber and having means providing fluid communication between said inlet and said flow chamber; (iv) said outlet conduit having an opening disposed within said flow chamber for guiding gas from said flow chamber to said outlet; (d) means including aperture means between said resonator chamber and said gas flow path enabling limited flow of gas through said resonator chamber, the ratio of the area of the open end of said inlet means into said resonator chamber to the aperture means being between 2-to-1 and 4-to-1; and (e) at least one of said inlet and outlet conduits having a plurality of attenuation holes through it for providing fluid communication to said at least one expansion chamber so that broad band sound attenuation can occur therein.
Claim 14
Dependent Claim
13 words
A muffler according to claim 9 in which said ratio is substantially 2-to-1.
Claim 15
Dependent Claim
21 words
A muffler according to claim 9 and a nozzle attenuator in said outlet conduit between said outlet and said flow chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |