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US4064693A
Expired / Lapsed
US
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Secondary air supply system for internal combustion engines
Assignee: Toyota Motor Corp
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Filing: 1976-06-04
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Granted: 1977-12-27
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Expires: 1996-06-04
Abstract
Abstract A non-return air flow system for supplying secondary air into the exhaust system of internal combustion engines by utilizing pulsating flow of exhaust gases in the exhaust system, wherein the critical valve opening pressure for a check valve incorporated in the non-return system is varied in accordance with intake air flow rate of the engine so that supply of secondary air is effected in proportion to air intake of the engine.
Inventors
- 👤 Norio Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:38
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/22; F01N3/227; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F16K15/026; F16K15/14; F16K15/148; F16K15/18; F16K15/182; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7843; Y10T137/7876; Y10T137/7879; Y10T137/7888; Y10T137/789; Y10T137/7904; Y10T137/7905
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A secondary air supply system for an internal combustion engine comprising a passage means for conducting secondary air to the exhaust system of the engine, and a check valve provided in the midst of said passage means for allowing air to flow only toward said exhaust system, said check valve comprising a valve element which opens the valve when air pressure difference above a predetermined level exists across the valve and a control means which controls said predetermined level in accordance with intake air flow rate of the engine in a manner to lower said level as the intake air flow rate increases.
Claim 2
Dependent Claim
103 words
A secondary air supply system for an internal combustion engine comprising a passage means for conducting secondary air to the exhaust system of the engine, and a check valve provided in the midst of said passage means for allowing air to flow only toward said exhaust system, said check valve comprising a valve element which opens the valve when air pressure difference above a predetermined level exists across the valve and a control means which controls said predetermined level in accordance with intake air flow rate of the engine in a manner to lower said level as the intake air flow rate increases.
Claim 3
Dependent Claim
44 words
The system of claim 1, wherein said control means comprises a spring means which biases the valve element toward a valve closing position and a means to vary effective force of said spring means in accordance with intake air flow rate of the engine.
Claim 4
Dependent Claim
87 words
The system of claim 2, wherein said spring means comprises a first spring which biases said valve element toward the valve closing position and a second spring which biases said valve element toward a valve opening position, said means for varying effective force of spring means comprising a diaphragm means having a diaphragm which defines a diaphragm chamber on a first side thereof and supports one end of said second spring on a second side thereof, said diaphragm chamber being applied with intake vacuum of the engine.
Claim 5
Dependent Claim
76 words
The system of claim 2, wherein said spring means comprises a spring which biases said valve element toward a valve closing position and said means for varying effective force of said spring means comprises a diaphragm means having a diaphragm which defines a diaphragm chamber on a first side thereof and supports one end of said spring on a second side thereof, said diaphragm chamber being applied with Venturi vacuum in a carburetor for the engine.
Claim 6
Dependent Claim
72 words
The system of claim 1, wherein said valve element is a reed member which is biased toward a valve closing position by its own elasticity, the thickness of said reed element being varied at different portions thereof, said control means comprising a means for shifting said reed element in accordance with intake air flow of the engine so that different portions of said reed element is placed at an effective operating position.
Claim 7
Dependent Claim
73 words
The system of claim 5, wherein said reed element is a rotary member having varying thickness along peripheral portions thereof, said rotary member cooperating with a disc member formed with at least one through opening adapted to be opened or closed by said reed element, said means for shifting said reed element comprising a diaphragm actuator which selectively rotates said rotary reed member in accordance with intake air flow rate of the engine.
Claim 8
Dependent Claim
27 words
The system of claim 6, wherein said rotary reed element has a butterfly shape including two sectoral portions each cooperating with at least one associated through opening.
Claim 9
Dependent Claim
46 words
The system of claim 7, wherein said diaphragm actuator is driven by the intake vacuum of the engine to drive said rotary reed element in a first rotary direction the thickness of said rotary reed element gradually decreasing along periphery thereof in said first rotary direction.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |