Patent US3906906A successfully refreshed from Google Patents.
US3906906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston engine
Assignee: Aisin Corp
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Filing: 1974-02-20
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Granted: 1975-09-23
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Expires: 1994-02-20
Abstract
Abstract A rotary piston engine wherein an auxiliary mixture chamber into which fuel is injected from a nozzle is provided between a suction port and an ignition plug in a center housing. A mixture injection member which reciprocatingly slides in accordance with the rotation of a rotor is provided in the auxiliary mixture chamber, and a communicating hole of the auxiliary mixture chamber communicates with each of the working chambers of the rotary piston as each chamber moves past the hole. As each working chamber goes through its suction stroke, a portion of the lean air/fuel mixture sucked in from the carburetor is also sucked into the auxiliary mixing chamber for mixture with fuel from the nozzle to produce a rich air/fuel mixture which is subsequently ejected into the lean air/fuel mixture in the working chamber. The lean and rich mixtures of air/fuel are then compressed in the working cylinder and ignited by the ignition plug.
Inventors
- 👤 Fuminao Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:56
CPC Classifications
F; F02; F02B; F02B53/00; F02B53/10; F02B53/04; F02B2053/005; F02M; F02M1/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
380 words
In a rotary piston engine having a case which includes a center housing with a polyarcuate inner peripheral surface and side plate portions for hermetically sealing the side parts of said center housing, a polygonal piston being provided within said case in a manner to be eccentrically rotatable therein, said piston sliding along the inner peripheral surface of said center housing at corner end parts of said piston, the interior of said case being partitioned into a plurality of working chambers, the volume of said each working chamber being varied at the sliding of said piston within said case, a suction port and an exhaust port being provided in said case, the improvement comprising a cylindrical auxiliary mixture chamber at an outer peripheral part of said center housing, means defining a communication hole in said center housing for fluidly communicating said auxiliary mixture with the interior of the particular working chamber communicating with said suction port, a nozzle and a mixture push-out member within said auxiliary mixture chamber, said nozzle being adapted to inject fuel into said auxiliary mixture chamber, a shaft driven by said piston, said mixture push-out member sliding airtightly on a cylindrical inner peripheral surface of said auxiliary mixture chamber and reciprocatingly driven by said shaft driven by said piston to inject a mixture in said auxiliary mixture chamber into said particular working chamber, so that in an engine cycle suction stroke of sucking only a lean mixture of air/fuel through said suction port, after the particular corner end part of said piston within said particular working chamber as situated on the fore side in the direction of rotation passes said communication hole, said mixture push-out member is caused to suck a portion of said lean mixture of air/fuel from within said particular working chamber into said auxiliary mixture chamber and simultaneously to inject the fuel from said injection nozzle so as to produce a rich air/fuel mixture within said auxiliary mixture chamber, and that in a period of the cycle from the approximate termination of the suction stroke of said particular working chamber to the first half of a compression stroke, said mixture push-out member is caused to inject said rich mixture in said auxiliary mixture chamber into said particular working chamber through said communication hole.
Claim 2
Dependent Claim
380 words
In a rotary piston engine having a case which includes a center housing with a polyarcuate inner peripheral surface and side plate portions for hermetically sealing the side parts of said center housing, a polygonal piston being provided within said case in a manner to be eccentrically rotatable therein, said piston sliding along the inner peripheral surface of said center housing at corner end parts of said piston, the interior of said case being partitioned into a plurality of working chambers, the volume of said each working chamber being varied at the sliding of said piston within said case, a suction port and an exhaust port being provided in said case, the improvement comprising a cylindrical auxiliary mixture chamber at an outer peripheral part of said center housing, means defining a communication hole in said center housing for fluidly communicating said auxiliary mixture with the interior of the particular working chamber communicating with said suction port, a nozzle and a mixture push-out member within said auxiliary mixture chamber, said nozzle being adapted to inject fuel into said auxiliary mixture chamber, a shaft driven by said piston, said mixture push-out member sliding airtightly on a cylindrical inner peripheral surface of said auxiliary mixture chamber and reciprocatingly driven by said shaft driven by said piston to inject a mixture in said auxiliary mixture chamber into said particular working chamber, so that in an engine cycle suction stroke of sucking only a lean mixture of air/fuel through said suction port, after the particular corner end part of said piston within said particular working chamber as situated on the fore side in the direction of rotation passes said communication hole, said mixture push-out member is caused to suck a portion of said lean mixture of air/fuel from within said particular working chamber into said auxiliary mixture chamber and simultaneously to inject the fuel from said injection nozzle so as to produce a rich air/fuel mixture within said auxiliary mixture chamber, and that in a period of the cycle from the approximate termination of the suction stroke of said particular working chamber to the first half of a compression stroke, said mixture push-out member is caused to inject said rich mixture in said auxiliary mixture chamber into said particular working chamber through said communication hole.
Claim 3
Dependent Claim
64 words
In the rotary piston engine according to claim 1, further comprising: an ignition plug, the front end of said mixture push-out member is hemispherical, seal means between said mixture push-out member and said cylindrical surface of said auxiliary mixture chamber, said communication hole is made eccentric to said mixture push-out member, and the interior of said communication hole is inclined towards said ignition plug.
References Cited (Backward Citations)
US3805747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |