Patent US4020800A successfully refreshed from Google Patents.
US4020800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston internal combustion engine with a stratified charge intake port system
Assignee: Nissan Motor Co Ltd
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Filing: 1975-11-11
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Granted: 1977-05-03
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Expires: 1995-11-11
Abstract
Abstract A rotary piston internal combustion engine of the type comprising a housing having two lobes and a three sided piston rotatable in planetary fashion within the housing, in which a rich air-fuel mixture and a lean air-fuel mixture separately enter into the housing via an auxiliary intake port and a main intake port, respectively.
Inventors
- 👤 Yoshikazu Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:03
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/22; F02; F02B; F02B17/00; F02B53/00; F02B53/04; F02B2053/005; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
245 words
A rotary piston internal combustion engine comprising: a housing having a cavity, said housing having a two lobed peripheral wall and two oppositely facing end walls interconnected by the peripheral wall to define the cavity; a rotary piston rotatably disposed in the cavity to form a plurality of working chambers in cooperation with said housing walls, said rotary piston having sides each of which is formed with a recess that is deeper in the leading half of each side of said rotary piston; one of the two oppositely facing end walls having an auxiliary intake port opening to the cavity and a main intake opening to the cavity, said auxiliary intake port being located radially outward of said main intake port with respect to the direction of rotation of said rotary piston and both of said intake ports being configured and sized such that said auxiliary intake port commences to communicate with one of the working chambers before said main intake port does and said main intake port is closed after said auxiliary intake port is to complete the intake phase of the one working chamber; means for supplying a rich mixture to said auxiliary intake port; means for supplying a lean mixture to said main intake port; and ignition means including a spark plug which is located at a position spaced before the minor axis of the two lobed peripheral wall by a predetermined angular distance from substantially 7 degrees to substantially 8 degrees.
Claim 2
Dependent Claim
245 words
A rotary piston internal combustion engine comprising: a housing having a cavity, said housing having a two lobed peripheral wall and two oppositely facing end walls interconnected by the peripheral wall to define the cavity; a rotary piston rotatably disposed in the cavity to form a plurality of working chambers in cooperation with said housing walls, said rotary piston having sides each of which is formed with a recess that is deeper in the leading half of each side of said rotary piston; one of the two oppositely facing end walls having an auxiliary intake port opening to the cavity and a main intake opening to the cavity, said auxiliary intake port being located radially outward of said main intake port with respect to the direction of rotation of said rotary piston and both of said intake ports being configured and sized such that said auxiliary intake port commences to communicate with one of the working chambers before said main intake port does and said main intake port is closed after said auxiliary intake port is to complete the intake phase of the one working chamber; means for supplying a rich mixture to said auxiliary intake port; means for supplying a lean mixture to said main intake port; and ignition means including a spark plug which is located at a position spaced before the minor axis of the two lobed peripheral wall by a predetermined angular distance from substantially 7 degrees to substantially 8 degrees.
Claim 3
Dependent Claim
250 words
A rotary piston internal combustion engine comprising: a housing having a cavity, said housing having a two lobed peripheral wall and two oppositely facing end walls interconnected by a peripheral wall to define the cavity; a three lobed rotary piston rotatably disposed in the cavity to form three working chambers in cooperation with said housing walls, said rotary piston having three sides each of which is formed with a bilge like recess that is deeper in the leading half of each side of said rotary piston; one of the two oppositely facing end walls having an auxiliary intake port opening to the cavity and a main intake port opening to the cavity, said auxiliary intake port being located radially outward of said main intake port with respect to the direction of rotation of said rotary piston and both of said intake ports being configured and sized such that said auxiliary intake port commences to communicate with one of the working chambers before said main intake port does and said main intake port is closed after said auxiliary intake is to complete the intake phase of the one working chamber; a first carburetor for supplying a rich mixture to said auxiliary intake port; a second carburetor for supplying a lean mixture to said main intake port; and ignition means including a spark plug which is located at a position spaced before the minor axis of the two lobed peripheral wall by a predetermined angular distance from substantially 7° to substantially 8°.
Claim 4
Dependent Claim
250 words
A rotary piston internal combustion engine comprising: a housing having a cavity, said housing having a two lobed peripheral wall and two oppositely facing end walls interconnected by a peripheral wall to define the cavity; a three lobed rotary piston rotatably disposed in the cavity to form three working chambers in cooperation with said housing walls, said rotary piston having three sides each of which is formed with a bilge like recess that is deeper in the leading half of each side of said rotary piston; one of the two oppositely facing end walls having an auxiliary intake port opening to the cavity and a main intake port opening to the cavity, said auxiliary intake port being located radially outward of said main intake port with respect to the direction of rotation of said rotary piston and both of said intake ports being configured and sized such that said auxiliary intake port commences to communicate with one of the working chambers before said main intake port does and said main intake port is closed after said auxiliary intake is to complete the intake phase of the one working chamber; a first carburetor for supplying a rich mixture to said auxiliary intake port; a second carburetor for supplying a lean mixture to said main intake port; and ignition means including a spark plug which is located at a position spaced before the minor axis of the two lobed peripheral wall by a predetermined angular distance from substantially 7° to substantially 8°.
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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |