US3795228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nozzle for rotary piston engine
Assignee: Mazda Motor Corp
•
Filing: 1971-12-22
•
Granted: 1974-03-05
•
Expires: 1991-12-22
Abstract
Abstract In a rotary piston engine, there is provided a system for purifying the exhaust gas to reduce NOx (nitrogen oxide) in the exhaust gas by recirculating the exhaust or combustion gas into an intake mixture or a system for purifying the exhaust gas to reduce unburned components such as CO, HC, etc. in the exhaust gas by supplying secondary air to the exhaust or combustion gas, and an outlet nozzle for the combustion gas or a supply nozzle for secondary air are adapted to open in the exhausting stroke chamber. Means are provided for preventing sludge from accumulating upon or adhering to the nozzles.
Inventors
- 👤 H Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:46
CPC Classifications
F; F02; F02B; F02B53/00; F02B53/10; F02B2053/005; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S60/00; Y10S60/901
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
152 words
In a rotary piston engine comprising: a casing having a center housing and side housings disposed on repective sides of said center housing, a rotary piston rotatably mounted in said casing and having at least one apex, an apex seal disposed in said piston apex, said apex seal slidably and sealably contacting said center housing inner surface, said casing and said rotary piston defining in order, intake, compression, combustion and exhaust chambers therebetween, an intake port within said casing opening up into said intake chamber for supplying primary air to said intake chamber, an exhaust port within said casing opening up into said exhaust chamber for exhausting combustion gas therefrom, and an auxiliary nozzle within said casing opening up into said exhaust chamber for supplying secondary air to said exhaust chamber, or for removal of exhaust gas therefrom for recirculation, the improvement comprising: means for preventing sludge accumulation about said auxiliary nozzle.
Claim 2
Dependent Claim
152 words
In a rotary piston engine comprising: a casing having a center housing and side housings disposed on repective sides of said center housing, a rotary piston rotatably mounted in said casing and having at least one apex, an apex seal disposed in said piston apex, said apex seal slidably and sealably contacting said center housing inner surface, said casing and said rotary piston defining in order, intake, compression, combustion and exhaust chambers therebetween, an intake port within said casing opening up into said intake chamber for supplying primary air to said intake chamber, an exhaust port within said casing opening up into said exhaust chamber for exhausting combustion gas therefrom, and an auxiliary nozzle within said casing opening up into said exhaust chamber for supplying secondary air to said exhaust chamber, or for removal of exhaust gas therefrom for recirculation, the improvement comprising: means for preventing sludge accumulation about said auxiliary nozzle.
Claim 3
Dependent Claim
84 words
A rotary piston engine as set forth in claim 1, wherein said sludge accumulation prevention means is provided in the inner surface of said casing for releasing the high pressure gas from the high pressure chamber to the low pressure chamber of two adjacent chambers of the engine in response to the pressure difference between said chambers when the apex seal passes over said sludge accumulation prevention means, thereby removing the sludge accumulated on said nozzle owing to the movement of said apex seal.
Claim 4
Dependent Claim
39 words
A rotary piston engine as set forth in claim 2, wherein said means comprises a flow passage having an inlet and outlet provided in said casing and the open end of said nozzle is connected to said flow passage.
Claim 5
Dependent Claim
28 words
A rotary piston engine as set forth in claim 3, wherein said outlet of the flow passage is obliquely connected upwardly to the open end of said nozzle.
Claim 6
Dependent Claim
26 words
A rotary piston engine as set forth in claim 3, wherein said flow passage and said nozzle are provided in the center housing of said casing.
Claim 7
Dependent Claim
35 words
A rotary piston engine as set forth in claim 1, wherein said means comprises a floating member mounted within said nozzlE and adapted to float longitudinally and laterally to remove sludge adhered to said nozzle.
Claim 8
Dependent Claim
82 words
A rotary piston engine as set forth in claim 6, wherein said nozzle is connected to an air source for supplying secondary air through a conduit into the exhausting stroke chamber, said floating member being adapted to connect the conduit with the chamber when the pressure in said conduit is larger than the pressure of said chamber, and to shut off communication between the conduit and the chamber when the pressure in said conduit is smaller than the pressure in said chamber.
Claim 9
Dependent Claim
78 words
A rotary piston engine as set forth in claim 6, wherein said nozzle is connected to an intake system to recirculate combustion gas to the intake mixture through the conduit said floating member shutting off the communication of the conduit with the chamber when the pressure in said conduit is larger than the pressure of said chamber, and connecting the conduit with the chamber when the pressure of said conduit is smaller than the pressure of said chamber.
Claim 10
Dependent Claim
24 words
A rotary piston engine as set forth in claim 6, wherein said floating member comprises a member of rivet shape engaged with said nozzle.
Claim 11
Dependent Claim
50 words
A rotary piston engine as set forth in claim 6, wherein said floating member is movably disposed at the open end of said nozzle, and a ring for preventing the floating member from being removed from the nozzle is provided at the end of said open end of said nozzle.
Claim 12
Dependent Claim
83 words
A rotary piston engine as set forth in claim 6, wherein said engine has two center housings and an intermediate housing disposed between said two center housings to form two adjacent cavities, an intake port and an exhaust port opening into the respective cavities, a conduit provided in said intermediate housing, each nozzle being branched from said conduit and opening at said intermediate housing into the respective cavities, and said floating member is composed of a single member in common with each nozzle.
Claim 13
Dependent Claim
35 words
A rotary piston engine as set forth in claim 11, wherein said each nozzle forms a hole penetrating said intermediate housing in the axial direction, and said floating member is movably mounted within said hole.
Claim 14
Dependent Claim
51 words
A rotary piston engine as set forth in claim 11, wherein said conduit is connected to an air source, and said floating member has collars at both ends thereof, said floating member being adapted to float longitudinally and laterally by the pressure in the exhausting stroke chamber of the adjacent cavities.
Claim 15
Dependent Claim
34 words
A rotary piston engine as set forth in claim 10, wherein said floating member has a hole through the center thereof so as to connect the conduit through the hole to the operating chamber.
Claim 16
Dependent Claim
62 words
A rotary piston engine as set forth in claim 10, wherein said nozzle is connected through the conduit to the secondary air supply source, and a floating member has a slit at the contacting surface with said ring for allowing the secondary air to flow into the chamber when the pressure in the conduit is larger than the pressure in the chamber.
Claim 17
Dependent Claim
36 words
A rotary piston engine as set forth in claim 2, wherein said means comprises a recess provided on the inner surface of said casing, and the open end of said nozzle is disposed within said recess.
Claim 18
Dependent Claim
25 words
A rotary piston engine as set forth in claim 16, wherein said recess and said nozzle is provided in the center housing of said casing.
Claim 19
Dependent Claim
35 words
A rotary piston engine as set forth in claim 16, wherein said recess is provided in the side housing of said casing, and a groove for connecting said recess to the exhaust port is provided.
Claim 20
Dependent Claim
25 words
A rotary piston engine as set forth in claim 16, wherein said nozzle includes a sleeve at its open end to project into said recess.
Claim 21
Dependent Claim
46 words
A rotary piston engine as set forth in claim 19, wherein said nozzle comprises a sleeve at its open end to project into said recess and said sleeve is closed at the outer end thereof, and includes at least one flow opening in its peripheral wall.
References Cited (Backward Citations)
US3097632A
Cited
US3168078A
Cited
US3265046A
Cited
US3464394A
Cited
US3476092A
Cited
US3546878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |