US3613646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary air injection system for an internal combustion engine
Assignee: Individual
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Filing: 1969-09-10
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Granted: 1971-10-19
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Expires: 1989-09-10
Abstract
Abstract A secondary air-injecting system for obtaining a large compression ratio with a small engine stroke and for burning fuel gas completely, in which air is injected in engine cylinders at least in portions of intake, detonation and exhaust periods of the engine operation cycle from a separate air tank and/or engine crankcases where air is compressed by the downward motion of engine pistons.
Inventors
- 👤 Souichi Hisada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:25
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/02; F02B33/26; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
240 words
In an internal-combustion engine having at least one cylinder, an intake valve, an exhaust valve and an ignition plug in the head of said cylinder, a piston slideable in said cylinder, a connecting rod connected to said piston, a crankshaft connected to said connecting rod and a crankcase for said crankshaft, a secondary air-injecting system comprising an airport through the sidewall of said cylinder positioned for being closed by said piston when said piston is at its lowest dead center position and opened to said crankcase when said piston is positioned above said port, an air conduit in said cylinder opening in said crankcase and in said cylinder at a position in said cylinder above the top of said piston when said piston is at its lowest dead center position and below said piston when said piston is at its top dead center position, said port and air conduit being the only openings in the sidewall of said cylinder below the top dead center of said piston, a check valve in said port which can open only towards the interior of said cylinder and a check valve in said air conduit which can open only towards the interior of said cylinder whereby air can automatically flow only through said port into said crankcase when said piston is above said port and from said crankcase through said air conduit into said cylinder when said piston is at its lower dead center.
Claim 2
Dependent Claim
240 words
In an internal-combustion engine having at least one cylinder, an intake valve, an exhaust valve and an ignition plug in the head of said cylinder, a piston slideable in said cylinder, a connecting rod connected to said piston, a crankshaft connected to said connecting rod and a crankcase for said crankshaft, a secondary air-injecting system comprising an airport through the sidewall of said cylinder positioned for being closed by said piston when said piston is at its lowest dead center position and opened to said crankcase when said piston is positioned above said port, an air conduit in said cylinder opening in said crankcase and in said cylinder at a position in said cylinder above the top of said piston when said piston is at its lowest dead center position and below said piston when said piston is at its top dead center position, said port and air conduit being the only openings in the sidewall of said cylinder below the top dead center of said piston, a check valve in said port which can open only towards the interior of said cylinder and a check valve in said air conduit which can open only towards the interior of said cylinder whereby air can automatically flow only through said port into said crankcase when said piston is above said port and from said crankcase through said air conduit into said cylinder when said piston is at its lower dead center.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |