US3657893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas purification system for internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1970-02-27
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Granted: 1972-04-25
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Expires: 1990-02-27
Abstract
Abstract An exhaust gas purification system for an internal combustion engine comprises a control valve means which automatically controls the supply of the secondary air to an exhaust passage or a reactor connected to said passage of an engine according to the running conditions of the engine such as revolution speed, acceleration or deceleration, magnitude of load, etc.
Inventors
- 👤 Tomoo Tadokoro
- 👤 Motoyuki Hayashida
- 👤 Shigetake Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:42
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/22; F01N3/227; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/8593; Y10T137/85978; Y10T137/86171
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
170 words
An exhaust gas purification system for an internal combustion engine for oxidizing and eliminating the unburnt noxious contents in exhaust gas by supplying secondary air into exhaust gas from the engine, which comprises an air pump adapted to be driven by the engine, said engine having an exhaust passage connected to the exhaust thereof, a conduit connecting said air pump to said exhaust passage, and control valve means in said conduit including a valve body having an inlet port connected on the air pump side and an outlet port on the exhaust passage side, a main valve in said body, spring means inside said valve body urging said main valve toward said inlet port from downstream thereof for closing said inlet port and an auxiliary valve integral with said main valve and movable relative said outlet port for controlling the area of said outlet port as said main valve moves, said auxiliary valve reducing the area of the outlet port as the main valve moves to open the inlet port.
Claim 2
Dependent Claim
170 words
An exhaust gas purification system for an internal combustion engine for oxidizing and eliminating the unburnt noxious contents in exhaust gas by supplying secondary air into exhaust gas from the engine, which comprises an air pump adapted to be driven by the engine, said engine having an exhaust passage connected to the exhaust thereof, a conduit connecting said air pump to said exhaust passage, and control valve means in said conduit including a valve body having an inlet port connected on the air pump side and an outlet port on the exhaust passage side, a main valve in said body, spring means inside said valve body urging said main valve toward said inlet port from downstream thereof for closing said inlet port and an auxiliary valve integral with said main valve and movable relative said outlet port for controlling the area of said outlet port as said main valve moves, said auxiliary valve reducing the area of the outlet port as the main valve moves to open the inlet port.
Claim 3
Dependent Claim
52 words
The exhaust gas purification system for an internal combustion engine as claimed in claim 1, in which said valve body has a valve seat provided with an opening connected to said inlet port and said main valve is forced by said spring against said valve seat so as to close said opening.
Claim 4
Dependent Claim
53 words
The exhaust gas purification system for an internal combustion engine as claimed in claim 2, in which said main valve has at least one hole therein in the portion which is outside of said seat for permitting easier flow of air past said main valve when the main valve is off said seat.
Claim 5
Dependent Claim
43 words
The exhaust gas purification system for an internal combustion engine as claimed in claim 1, in which said auxiliary valve consists of a plate member as an integral part of said main valve and has at least one ventilating hole in said member.
Claim 6
Dependent Claim
55 words
The exhaust gas purification system for an internal combustion engine as claimed in claim 1, in which said auxiliary valve consists of a bar member extending from said main valve as an integral part of said main valve in the direction of the outlet port and tapering as it extends away from said main valve.
Claim 7
Dependent Claim
167 words
An exhaust gas purification system for an internal combustion engine for oxidizing and eliminating the unburnt noxious contents in exhaust gas by supplying secondary air into exhaust gas from the engine, which comprises an air pump adapted to be driven by the engine, said engine having a reactor connected to the exhaust thereof, a conduit connecting said air pump to said reactor, and control valve means in said conduit including a valve body having an inlet port connected on the air pump side and an outlet port on the reactor side, a main valve in said body, spring means inside said valve body urging said main valve toward said inlet port from downstream thereof for closing said inlet port and an auxiliary valve integral with said main valve and movable relative said outlet port for controlling the area of said outlet port as said main valve moves, said auxiliary valve reducing the area of the outlet port as the main valve moves to open the inlet port.
Claim 8
Dependent Claim
167 words
An exhaust gas purification system for an internal combustion engine for oxidizing and eliminating the unburnt noxious contents in exhaust gas by supplying secondary air into exhaust gas from the engine, which comprises an air pump adapted to be driven by the engine, said engine having a reactor connected to the exhaust thereof, a conduit connecting said air pump to said reactor, and control valve means in said conduit including a valve body having an inlet port connected on the air pump side and an outlet port on the reactor side, a main valve in said body, spring means inside said valve body urging said main valve toward said inlet port from downstream thereof for closing said inlet port and an auxiliary valve integral with said main valve and movable relative said outlet port for controlling the area of said outlet port as said main valve moves, said auxiliary valve reducing the area of the outlet port as the main valve moves to open the inlet port.
Claim 9
Dependent Claim
52 words
The exhaust gas purification system for an internal combustion engine as claimed in claim 6, in which said valve body has a valve seat provided with an opening connected to said inlet port and said main valve is forced by said spring against said valve seat so as to close said opening.
Claim 10
Dependent Claim
53 words
The exhaust gas purification system for an internal combustion engine as claimed in claim 7, in which said main valve has at least one hole therein in the portion which is outside of said seat for permitting easier flow of air past said main valve when the main valve is off said seat.
Claim 11
Dependent Claim
43 words
The exhaust gas purification system for an internal combustion engine as claimed in claim 6, in which said auxiliary valve consists of a plate member as an integral part of said main valve and has at least one ventilating hole in said member.
Claim 12
Dependent Claim
55 words
The exhaust gas purification system for an internal combustion engine as claimed in claim 6, in which said auxiliary valve consists of a bar member extending from said main valve as an integral part of said main valve in the direction of the outlet port and tapering as it extends away from said main valve.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |