Fluid sprinkling – spraying – and diffusing – Processes
Reexamination Certificate
1999-11-29
2002-04-16
Ganey, Steven J. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Processes
C239S005000, C239S088000, C239S533900, C239S585100, C137S625650, C029S890120, C029S890128
Reexamination Certificate
active
06371382
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for machining control edges of a valve, preferably, of a valve for a fuel injection device of an internal combustion engine, such fuel injection device having at least one piston provided with control edges which co-operate with control edges fixedly connected to a valve. The present invention also relates to a fuel injection device having a valve having control edges manufactured pursuant to the foregoing method and with the aid of which at least one valve body can be activated that can close off nozzle openings.
For a reliable and clean mixture formation within the combustion chamber, internal combustion engines, Diesel engines in particular, require an injection process consisting of several individual injection actions. These injection actions are divided into a pre-injection and a main injection action of the fuel. For producing the pre-injection fuel quantity, a control unit is employed which requires a high-cost electronic control system and which shows energy losses. With injection devices based on the principle of pressure intensification, a very fast-operating and precise pilot valve is required, for the injection process in order to enable the secure intensification of the injection actions. Such pilot valves have to be manufactured with great precision and a complicated structural design and at high costs in order that they can reliably control the pre-injection action as well as the main injection.
Therefore, it is an object of the present invention to provide the method and the fuel injection device of the aforementioned kind such that the valve can be manufactured with high precision at low costs.
SUMMARY OF THE INVENTION
This object is solved with the inventive method by machining the respectively co-operating control edges in one single machining operation with the aid of one single tool. The object is solved with the inventive device by providing the valve to be controllable by a control unit and to be equipped with working connections by means of which a pressure medium is supplied to a control piston by which the valve body can be activated.
With the inventive method, the respectively co-operating control edges are machined in one single operation by a single tool. Since the pairs of the two control edges positioned toward each other are manufactured in one single operation, merely the tolerance of the tool is transferred onto the structural members of the valve provided with the control edges. Thereby, the control edges which are decisive for a high precision of the valve can be manufactured in a simple and inexpensive way. With the inventive fuel injection device, the respective fuel quantity can be injected into the combustion chamber very precisely at the required quantity.
REFERENCES:
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patent: 4588161 (1986-05-01), Adams
patent: 5329841 (1994-07-01), Sauer et al.
patent: 5460329 (1995-10-01), Sturman
patent: 5615860 (1997-04-01), Brehm et al.
patent: 5640987 (1997-06-01), Sturman
patent: 6085991 (2000-07-01), Sturman
Lenk Martin
Martin Steffen
Niethammer Bernd
Becker R. W.
Ganey Steven J.
Hydraulik-Ring GmbH
R.W. Becker & Associates
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