US3885003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intake system for an internal combustion engine
Assignee: Nissan Motor Co Ltd
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Filing: 1974-02-06
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Granted: 1975-05-20
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Expires: 1994-02-06
Abstract
Abstract An intake system for an internal combustion engine comprises a primary throttle valve disposed in a primary combustible mixture intake passageway, a check valve disposed in the primary intake passageway near an intake port of the engine, a secondary throttle valve disposed in a secondary combustible mixture intake passageway near an intake port of the engine and operatively connected to the primary throttle valve, an auxiliary throttle valve disposed in the second intake passageway upstream of the secondary throttle valve and actuated to open the secondary intake passageway in response to combustible mixture acting on the surface of the auxiliary throttle valve, and a fuel port opening into the secondary intake passageway at a position where the auxiliary throttle valve closes the secondary intake passageway whereby the secondary and auxiliary throttle valves are opened to supply the engine with additional combustible mixture at a desired or optimum timing when the primary throttle valve is opened a predetermined amount.
Inventors
- 👤 Kazuaki Kobayashi
- 👤 Tatsujiro Okuno
- 👤 Shinya Katayama
- 👤 Takehiko Kita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:58
CPC Classifications
F; F02; F02M; F02M11/00; F02M11/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
188 words
An intake system for an internal combustion engine, comprising primary and secondary combustible mixture intake passageways providing communication between the atmosphere and said engine, a primary throttle valve movably disposed in said primary intake passageway, a check valve disposed in said primary intake passageway downstream of said primary intake passageway and near said engine and opening said primary intake passageway only when the pressure on the engine side of said check valve is below that on the opposite side thereof, a secondary throttle valve disposed in said secondary intake passageway near said engine and operatively connected through a linkage to said primary throttle valve to be actuated to open said secondary intake passageway when said primary throttle valve is opened in excess of a predetermined amount, an auxiliary throttle valve disposed in said secondary intake passageway upstream of said secondary throttle valve and actuated to open said secondary intake passageway in response to combustible mixture acting on the surface area of said auxiliary throttle valve, and a fuel port opening into said secondary intake passageway at a position where said auxiliary throttle valve closes said secondary intake passageway.
Claim 2
Dependent Claim
188 words
An intake system for an internal combustion engine, comprising primary and secondary combustible mixture intake passageways providing communication between the atmosphere and said engine, a primary throttle valve movably disposed in said primary intake passageway, a check valve disposed in said primary intake passageway downstream of said primary intake passageway and near said engine and opening said primary intake passageway only when the pressure on the engine side of said check valve is below that on the opposite side thereof, a secondary throttle valve disposed in said secondary intake passageway near said engine and operatively connected through a linkage to said primary throttle valve to be actuated to open said secondary intake passageway when said primary throttle valve is opened in excess of a predetermined amount, an auxiliary throttle valve disposed in said secondary intake passageway upstream of said secondary throttle valve and actuated to open said secondary intake passageway in response to combustible mixture acting on the surface area of said auxiliary throttle valve, and a fuel port opening into said secondary intake passageway at a position where said auxiliary throttle valve closes said secondary intake passageway.
Claim 3
Dependent Claim
104 words
An intake system as claimed in claim 1, in which said linkage comprises a first lever fixedly mounted on a shaft of said primary throttle valve and having formed thereon an extension projecting from the plane of said first lever, a plate pivotally mounted on said shaft of said primary throttle valve and having formed therein a slot into which said extension of said first lever is movably inserted, a rod pivotally connected at one end thereof to said plate, and a second lever pivotally connected to the other end of said rod and fixedly mounted on a shaft of said secondary throttle valve.
Claim 4
Dependent Claim
96 words
An intake system as claimed in claim 1, in which said check valve comprises a valve retainer extending into said primary intake passageway and curved toward said engine, a valve plate having one free end and mounted at the other end thereof on said valve retainer, said valve plate being seatable on said retainer when said valve plate opens said primary intake passageway, and a valve seat formed in said primary intake passageway, said valve plate being seatable at said free end thereof on said valve seat when said valve plate closes said primary intake passageway.
Claim 5
Dependent Claim
70 words
An intake system as claimed in claim 1, in which said auxiliary throttle valve comprises a rotatable shaft disposed in said secondary intake passageway at a position deviating from the center thereof, a valve member disposed in said secondary intake passageway and fixedly mounted on said shaft, an arm fixedly mounted at one end thereof on said shaft, and a weight fixedly mounted on the other end of said arm.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |