Internal-combustion engines – Engine speed regulator – Having plural throttle valve structure
Patent
1993-05-04
1995-01-03
Cross, E. Rollins
Internal-combustion engines
Engine speed regulator
Having plural throttle valve structure
1231901, F01L 702
Patent
active
053776356
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a rotary throttle valve for transferring a fluid between a fluid source and a combustion chamber of an internal-combustion engine, comprising at least one substantially cylindrical surface and a side wall.
More particularly, the present invention relates to a rotary throttle valve for controlling the intake of gas, notably of an air-fuel mixture, into a combustion chamber of an engine, comprising an intrinsic sealing system.
The present invention applies to two-stroke or four-stroke internal-combustion engines having one or several cylinders supplied by a gas, notably an air-fuel mixture.
BACKGROUND OF THE INVENTION
Delivery of a carbureted mixture into the combustion chamber may be achieved through parts driven by a reciprocating motion, such as valves. A system of this type is proposed in patent application EN-89/17,484.
However, engine performances may be limited by valve injection systems, notably concerning control of the beginning and of the end of the injection process and the opening area for the carbureted air (oscillation problems).
Moreover, these systems have to be mounted in cylinder heads of relatively large size. One improvement consists in using rotary throttle valves for the control and delivery of a carbureted mixture.
Thus, patent application EN-90/06,323 provides the use of rotary throttle valves for controlling the pneumatic injection of fuel into a two-stroke engine.
The throttle valves disclosed have a rotational axis located in a plane perpendicular to the axis of the cylinder. Throttle valves are pierced with a transverse channel for communicating the linking channel with the combustion chamber and they are connected to driving means for rotating them as a function of the rotational speed of the engine crankshaft.
In comparison with valves, such throttle valves may be run at a higher speed and allow a higher flexibility in the injection adjustment.
However, sealing problems remain, notably at the throttle valve inlet.
Sealing devices are sometimes provided to that end, either upstream or downstream from each throttle valve, or in both places.
Patent application FR-2,559,208 relates to a throttle valve for controlling the exhaust and/or the intake of gas from and/or towards a combustion chamber, and on which one or several sealing parts are applied. The improvement envisaged in this patent consists of a lubrication and a refrigeration of the contact surface between the sealing part(s) and the throttle valve.
The sophistication of this system does not ensure perfect reliability, notably concerning sealing.
SUMMARY OF THE INVENTION
The present invention proposes a rotary throttle valve of simple design, which requires no additional sealing part, independent at the level of the intake.
Sealing at the intake is ensured according to the invention by the shape and the lay-out of the throttle valve.
Thus, the invention relates to a rotary throttle valve of the type defined at the beginning of the description.
More particularly, the rotary valve according to the invention comprises at least one flow channel for the fluid having an inlet and an outlet, with the inlet belonging to the lateral surface of the rotary valve and being positioned at a distance, which is not zero, from the rotational axis of the rotary valve. The outlet belongs to the cylindrical surface of the rotary valve and is radially offset with respect to the inlet.
The outlet is positioned at a greater distance from the axis rotation than the inlet.
Furthermore, at least one fuel injector comes out close to the inlet and inside the rotary valve, the injector being oriented in such a way that its axis exhibits an orientation close to that of the face of the channel which is the closest to the axis of rotation of the rotary valve.
Preferably, for each channel co-operating with an injector, the face of the channel which is the furthest from the longitudinal axis of the rotary valve goes further from the axis from the inlet.
Besides, at least one of said flow channel
REFERENCES:
patent: 2158386 (1939-05-01), Sykes
patent: 3871340 (1975-03-01), Zimmerman
patent: 4007725 (1977-02-01), Weaver
patent: 4075986 (1978-02-01), Keck
patent: 4546743 (1985-10-01), Eickmann
patent: 4834038 (1989-05-01), Montagni
patent: 5052349 (1991-10-01), Buelna
patent: 5074265 (1991-12-01), Ristin et al.
patent: 5081966 (1992-01-01), Hansen
Cross E. Rollins
Institut Francais du Pe'trole
Solis Erick
LandOfFree
Rotary throttle valve and utilization of said throttle valve for does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotary throttle valve and utilization of said throttle valve for, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary throttle valve and utilization of said throttle valve for will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2203990