Fluid sprinkling – spraying – and diffusing – Injection nozzle opened by relieving supply
Reexamination Certificate
2001-11-07
2003-12-30
Mar, Michael (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Injection nozzle opened by relieving supply
C239S584000, C239S533700
Reexamination Certificate
active
06669108
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a pressure-control injector for injecting fuel with a double valve.
The fuel injection systems commonly used for direct injection and internal combustion engines nowadays contain a high-pressure collecting chamber (common rail). In addition to a high pressure collecting chamber the injection system includes injectors which project into a combustion chamber of an internal combustion engine to be supplied with fuel. Upon injection the demand for the fuel quantity to be injected and the starter injection is exceptionally important and must take into consideration the ignition leg. Moreover, the injectors represent mechanically loaded components whose fatigued strength at favorable manufacturing costs must not fall below the service life of the internal combustion engine.
Reference numerals EP 0 657 642 A2 and DE 197 01 879 A1 each disclose a fuel injection device for combustion engines. More specifically, each of these documents describes a fuel injection device that includes a high pressure pump which is assigned to a high pressure accumulating chamber (common rail) that is to be filled with fuel. A high pressure accumulating chamber is connected via injection lines with injection valves projecting into the combustion chamber of the internal combustion engine. The opening or closing movements are controlled respectively by an electrically control valve. The control portion is formed as a 3/2 way valve, which is connected with the injection line or a release line to a high pressure channel opened to an injection opening of the injection valve. A hydraulic working chamber or a pressure release chamber fillable with high pressure fuel is provided on a control member of the control part. The working chamber is controllable for adjustment of the set position of the control member of a release channel. As the case may be, during a pause an injection a connection between the injection valve and the release chamber can be created. Both these devices have a considerable overall height.
SUMMARY OF THE INVENTION
Accordingly, it is an object of present invention to provide a pressure-control injector for injecting fuel with a double valve, which avoids the disadvantages of the prior art.
In contrast to the devices described above, the present invention provides a 3/2-way valve which has a very compact construction and can be produced in a cost effective manner due to the use of ball-shaped bodies. The ball-shaped bodies arranged as ball valves opposite to one another represent simple standard parts, which based on the geometry, allow an optimal pressure distribution of the surface to receive the pressure. In addition, the solution proposed in the present invention makes possible the production of a simply constructed 3/2 valve without the need for relative movements of a seat surface.
The positioning of the balls lying opposite to one another on and supported by a common guide, bring about a self-centering of the balls in their respective ball sockets in a simple manner. Another manufacturing advantage associated with the valve configuration is that the ball sockets lye freely on or on top of the faces of the guide, and by the respective pressure forces take care of the centering itself with reference to a center line of the injector. The ball sockets are composed of a soft metal or a soft metal alloy to facilitate a secure support and to ensure an optimal fitting to the ball surface geometry. Thus, with the configuration of the injector in accordance with the present invention adjusting plate is avoided in the life of the injector, and a centering of the ball sockets and the balls received therein relative to the guide and thereby to the line of symmetry of the injector is realized. The guide which has the ball sockets.
The guide which has the ball sockets on its upper and lower sides is provided with free spaces which permit a longitudinal flow of the pressurized fuel upon pressure release of the control chamber by regulation of a 2/2 valve. A pressure release of the nozzle chamber of the injection nozzle takes place through a pressure release of the nozzle inlet and the pressure chamber connected thereby via the ball valve on the control chamber side to which upon closing of the common rail the nozzle inlet line releases various oil.
With the use of a high pressure receiving chamber line which is angled at 90°, its connection to the injector body is lateral, and the height of the inventive injector is favorably affected or in other words minimized.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 4763873 (1988-08-01), Phillips
patent: 6092744 (2000-07-01), Youakim
patent: 6520157 (2003-02-01), Boecking
patent: 6568368 (2003-05-01), Boecking
patent: 197 01 879 (1998-07-01), None
patent: 0 657 642 (1995-06-01), None
Bui Thach H.
Mar Michael
Striker Michael J.
LandOfFree
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