US4162613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas purifier of an internal combustion engine
Assignee: Toyota Motor Corp
•
Filing: 1977-12-22
•
Granted: 1979-07-31
•
Expires: 1997-12-22
Abstract
Abstract An exhaust gas purifier for a four-stroke internal combustion engine has a plurality of cylinders consisting of cylinder groups, each of which has at least two cylinders, and the opening durations of the exhaust valves in any one group do not overlap. The exhaust passages of the cylinders of one of the cylinder groups are connected to the atmosphere via a common reed valve.
Inventors
- 👤 Tetsuomi Tamura
- 👤 Koichi Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:29
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/30; F01N3/34; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1812; F02B2075/182; F02B2075/1824; F02B75/20; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
An exhaust gas purifier in a four-stroke internal combustion engine having an exhaust passage and an air cleaner having therein a dust portion and a clean portion which is connected to a cylinder of the engine, said purifier comprising: a secondary air conduit communicating said dust portion with said exhaust passage; a silencer disposed in said secondary air conduit; a reed valve disposed in said secondary air passage between said silencer and said exhaust passage and arranged to open automatically in response to a decrease in pressure below a predetermined value in said exhaust passage to permit the supply of a secondary air into said exhaust passage; and an air filter disposed in said secondary air passage between said silencer and said reed valve.
Claim 2
Dependent Claim
124 words
An exhaust gas purifier in a four-stroke internal combustion engine having an exhaust passage and an air cleaner having therein a dust portion and a clean portion which is connected to a cylinder of the engine, said purifier comprising: a secondary air conduit communicating said dust portion with said exhaust passage; a silencer disposed in said secondary air conduit; a reed valve disposed in said secondary air passage between said silencer and said exhaust passage and arranged to open automatically in response to a decrease in pressure below a predetermined value in said exhaust passage to permit the supply of a secondary air into said exhaust passage; and an air filter disposed in said secondary air passage between said silencer and said reed valve.
Claim 3
Dependent Claim
76 words
An exhaust gas purifier as claimed in claim 1, wherein said engine has a plurality of cylinders each having an intake valve, an exhaust valve and an exhaust passage, said cylinders being arranged in cylinder groups each of which group comprises at least two cylinders, the opening durations of the exhaust valves in any one group not overlapping, said secondary air passage being connected to the exhaust passages of cylinders of one of said cylinder groups.
Claim 4
Dependent Claim
35 words
An exhaust gas purifier as claimed in claim 2, wherein the exhaust passages not connected with said secondary air passage are connected to an intake, manifold of the engine via an exhaust recirculation control valve.
Claim 5
Dependent Claim
39 words
An exhaust gas purifier as claimed in claim 2, wherein said cylinder group comprising the cylinders connected to said dust portion via said secondary air conduit is provided with an exhaust manifold which is independent of the remaining cylinders.
Claim 6
Dependent Claim
27 words
An exhaust gas purifier as claimed in claim 4, wherein said remaining cylinders not connected with said secondary air passage are provided with a common exhaust manifold.
Claim 7
Dependent Claim
47 words
An exhaust gas purifier as claimed in claim 2, wherein the durations of the overlap of the intake valves with the exhaust valves in the cylinders connected with said secondary air passage are longer than those in the remaining cylinders not connected with said secondary air passage.
Claim 8
Dependent Claim
24 words
An exhaust gas purifier as claimed in claim 1, wherein said purifier further comprises a catalytic converter in the exhaust passage of the engine.
Claim 9
Dependent Claim
24 words
An exhaust gas purifier as claimed in claim 1, wherein said purifier further comprises a manifold reactor in the exhaust passage of the engine.
Claim 10
Dependent Claim
23 words
An exhaust gas purifier as recited in claim 1, wherein said purifier further comprises a thermal-reactor in the exhaust passage of the engine.
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) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |