US3989015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distribution apparatus for an internal combustion engine with stratified charge
Assignee: Renault SA
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Filing: 1975-03-11
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Granted: 1976-11-02
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Expires: 1995-03-11
Abstract
Abstract A prechamber in the cylinder head of an internal combustion engine is fed with a rich air-fuel mixture by means of a valve comprising a flexible blade element which normally rests on a flat seat. The actuator control for opening of the blade element is effected on the one hand by natural aspiration of the cylinder and on the other hand by a cam element carried by a cam shaft and directly acting on the flexible blade element.
Inventors
- 👤 Jean-Pierre Rivere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:34
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/10; F02B19/1019; F02B19/1023; F02B19/1028; F02B19/1033; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
207 words
In as internal combustion engine having a main combustion chamber and a prechamber formed in a cylinder head provided with conduit means for supplying air-fuel mixture to the prechamber, the improvement comprising valve means for controlling admission of air-fuel mixture into the prechamber, a rotatable cam shaft, and a rotatable actuator mounted on said cam shaft for rotation therewith to operate the valve means, said valve means including a flat blade element, and a seat member for said flat blade element, the flat blade element being resilient and urged by its resilience into a closed position against said seat member, said rotatable actuator comprising a cam on said cam shaft shaped to periodically contact and open the blade element to feed the air-fuel mixture to the prechamber, said blade being also subjected to suction in the prechamber during the admission stroke of the engine tending to move the blade to open position, said cam shaft including a pair of spaced bearing portions adapted for rotation in a bore provided in the cylinder head of the engine, said cam being disposed between bearing portions and being of reduced size to define with the cylinder head an unsymmetrical channel which communicates with the conduit means supplying the air-fuel mixture.
Claim 2
Dependent Claim
207 words
In as internal combustion engine having a main combustion chamber and a prechamber formed in a cylinder head provided with conduit means for supplying air-fuel mixture to the prechamber, the improvement comprising valve means for controlling admission of air-fuel mixture into the prechamber, a rotatable cam shaft, and a rotatable actuator mounted on said cam shaft for rotation therewith to operate the valve means, said valve means including a flat blade element, and a seat member for said flat blade element, the flat blade element being resilient and urged by its resilience into a closed position against said seat member, said rotatable actuator comprising a cam on said cam shaft shaped to periodically contact and open the blade element to feed the air-fuel mixture to the prechamber, said blade being also subjected to suction in the prechamber during the admission stroke of the engine tending to move the blade to open position, said cam shaft including a pair of spaced bearing portions adapted for rotation in a bore provided in the cylinder head of the engine, said cam being disposed between bearing portions and being of reduced size to define with the cylinder head an unsymmetrical channel which communicates with the conduit means supplying the air-fuel mixture.
Claim 3
Dependent Claim
39 words
The improvement as claimed in claim 1. wherein the engine has a spark plug in said prechamber, said flat blade element having an opened position in which it is oriented to direct the air-fuel mixture towards said spark plug.
Claim 4
Dependent Claim
28 words
The improvement claimed in claim 1 wherein said cam includes a cylindrical portion with a truncated flat surface and a cam element centrally projecting from said flat surface.
Claim 5
Dependent Claim
31 words
The improvement claimed in claim 3 wherein said cam shaft rotates in a given direction to produce a scavenging action on the air-fuel mixture in said channel during the admission stroke.
Claim 6
Dependent Claim
47 words
The improvement claimed in claim 3 wherein said bearing portions are lubricated and are provided with intercepting grooves for preventing lubricant from entering the prechamber, and sealing joints downstream of said grooves for forming a seal between said bearing portions and the cylinder head and seat member.
Claim 7
Dependent Claim
28 words
The improvement as claimed in claim 5 wherein said cylinder head and said seat member are provided with aligned grooves in which said sealing joints are cooperatively received.
Claim 8
Dependent Claim
39 words
The improvement as claimed in claim 3 wherein said cam element projects beyond the periphery of the cam shaft, said seat member and said cylinder head being provided with a circular groove to provide passage of said cam element.
Claim 9
Dependent Claim
76 words
The improvement as claimed in claim 1 wherein said cylinder head has a recess receiving said seat member, said cylinder head and seat member having aligned grooves, an elastic sealing collar extending into said grooves to seal the seat member in said recess, and a resilient element in said recess beneath said seat member for action on said blade element to hold the same against the seat member and maintain the assembly thereof in said recess.
Claim 10
Dependent Claim
21 words
The improvement as claimed in claim 8 wherein said resilient element is a spring washer integrally formed with said blade element.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |