US5025890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine exhaust apparatus
Assignee: Mazda Motor Corp
•
Filing: 1990-02-23
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Granted: 1991-06-25
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Expires: 2010-02-23
Abstract
Abstract An engine exhaust including a silencer which has a cylindrical shell, a front and a rear end plate which are provided to close both ends of the cylindrical shell, and at least three partition walls to divide an inside space of the silencer into a plurality of chambers, i.e. at least a first chamber, a second chamber, a third chamber and a fourth chamber. An inlet pipe which bypasses at least the first and the second chambers, and connects the front end and the third chamber. The inlet pipe has a plurality of small holes which face toward the first and the second chambers. The small holes facing the second chamber are surrounded by a sound absorber. An outlet pipe bypasses at least the second, the third and the fourth chambers and connects the first chamber and the rear end plate. The outlet pipe has a plurality of small holes which face toward the third and the fourth chambers. The small holes facing the fourth chamber are surrounded by a sound absorber.
Inventors
- 👤 Nobuyasu Hisashige
- 👤 Fukuichi Yokogawa
- 👤 Makoto Shinhama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:17
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/084; F01N1/02; F01N1/10; F01N2490/00; F01N2490/15; F01N2490/155
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
184 words
An engine exhaust apparatus comprising a silencer having: a shell for accommodating silencer elements; a front and a rear end plate closing both ends of the shell; at least three partition walls to divide an inside space of the silencer into a plurality of chambers including a first chamber, a second chamber, a third chamber and a fourth chamber which are arrayed from front to rear of the silencer; an inlet pipe bypassing the first and the second chambers, and connecting the front end plate and the third chamber; said inlet pipe having a plurality of small holes located in the first and the second chambers; said small holes of said inlet pipe located in the second chamber being surrounded by a first sound absorber; an outlet pipe bypassing the second, the third and the fourth chambers, and connecting the first chamber and the rear end plate; said outlet pipe having a plurality of small holes located in the third and the fourth chambers; and said small holes of said outlet pipe located in the fourth chamber being surrounded by a second sound absorber.
Claim 2
Dependent Claim
184 words
An engine exhaust apparatus comprising a silencer having: a shell for accommodating silencer elements; a front and a rear end plate closing both ends of the shell; at least three partition walls to divide an inside space of the silencer into a plurality of chambers including a first chamber, a second chamber, a third chamber and a fourth chamber which are arrayed from front to rear of the silencer; an inlet pipe bypassing the first and the second chambers, and connecting the front end plate and the third chamber; said inlet pipe having a plurality of small holes located in the first and the second chambers; said small holes of said inlet pipe located in the second chamber being surrounded by a first sound absorber; an outlet pipe bypassing the second, the third and the fourth chambers, and connecting the first chamber and the rear end plate; said outlet pipe having a plurality of small holes located in the third and the fourth chambers; and said small holes of said outlet pipe located in the fourth chamber being surrounded by a second sound absorber.
Claim 3
Dependent Claim
18 words
An engine exhaust apparatus in accordance with claim 1, wherein the plurality of chambers consists of four chambers.
Claim 4
Dependent Claim
31 words
An engine exhaust apparatus in accordance with claim 2, wherein the first, the second, the third and the fourth chambers are formed in series along an axis of the inlet pipe.
Claim 5
Dependent Claim
21 words
An engine exhaust apparatus in accordance with claim 2, wherein the first and the second sound absorber are held by holders.
Claim 6
Dependent Claim
21 words
An engine exhaust apparatus in accordance with claim 2, wherein the first chamber consists of a chamber for expanding exhaust gases.
Claim 7
Dependent Claim
21 words
An engine exhaust apparatus in accordance with claim 2, wherein the second chamber consists of a chamber for expanding exhaust gases.
Claim 8
Dependent Claim
21 words
An engine exhaust apparatus in accordance with claim 2, wherein the third chamber consists of a chamber for expanding exhaust gases.
Claim 9
Dependent Claim
19 words
An engine exhaust apparatus in accordance with claim 2, wherein the fourth chamber consists of a chamber for resonance.
Claim 10
Dependent Claim
21 words
An engine exhaust apparatus in accordance with claim 2, wherein the fourth chamber consists of a chamber for expanding exhaust gases.
Claim 11
Dependent Claim
22 words
An engine exhaust apparatus in accordance with claim 9, wherein the second chamber and the fourth chamber are connected by a pipe.
Claim 12
Dependent Claim
27 words
An engine exhaust apparatus in accordance with claim 9, wherein a through hole is provided in the partition wall between the third chamber and the fourth chamber.
Claim 13
Dependent Claim
26 words
An engine exhaust apparatus in accordance with claim 8, wherein a resonance pipe is provided in the partition plate between the third and the fourth chambers.
Claim 14
Dependent Claim
29 words
An engine exhaust apparatus in accordance with claim 12, wherein the resonance pipe has a same axis as the inlet pipe and is located downstream of the inlet pipe.
Claim 15
Dependent Claim
26 words
An engine exhaust apparatus in accordance with claim 1, wherein the inlet pipe is connected to the third chamber through the first and the second chambers.
Claim 16
Dependent Claim
23 words
An engine exhaust apparatus in accordance with claim 9, wherein the inlet pipe and the outlet pipe are extend parallel to each other.
Claim 17
Dependent Claim
42 words
An engine exhaust apparatus in accordance with claim 14, wherein the inlet pipe extends through the front end plate, the partition wall between the first chamber and the second chamber, and the partition wall between the second chamber and the third chamber.
Claim 18
Dependent Claim
23 words
An engine exhaust apparatus in accordance with claim 1, wherein the partition walls are three walls for defining four chambers in the shell.
Claim 19
Dependent Claim
27 words
An engine exhaust apparatus in accordance with claim 17, wherein the partition wall between the first chamber and the second chamber has a plurality of small holes.
Claim 20
Dependent Claim
24 words
An engine exhaust apparatus in accordance with claim 17, wherein the partition wall between the second and the third chambers has a through hole.
Claim 21
Dependent Claim
24 words
An engine exhaust apparatus in accordance with claim 17, wherein the partition wall between the third and the fourth chambers has a resonance pipe.
Claim 22
Dependent Claim
24 words
An engine exhaust apparatus in accordance with claim 17, wherein the partition wall between the third chamber and the fourth chamber has a hole.
Claim 23
Dependent Claim
31 words
An engine exhaust apparatus in accordance with claim 1, wherein the outlet pipe connects the first chamber to outside of the silencer through the second, the third and the fourth chambers.
Claim 24
Dependent Claim
25 words
An engine exhaust apparatus in accordance with claim 22, wherein the outlet pipe consists of a plurality of pipes which extend parallel to each other.
Claim 25
Dependent Claim
27 words
An engine exhaust apparatus in accordance with claim 22, wherein the outlet pipe has a drain pipe for sucking water collected in a bottom of the shell.
Claim 26
Dependent Claim
36 words
An engine exhaust apparatus in accordance with claim 22, wherein the outlet pipe is mounted in the rear end plate and three partition plates which define the first, the second, the third and the fourth chambers.
References Cited (Backward Citations)
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Cited
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US4393956A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |