Valves and valve actuation – With material guide or restrictor
Patent
1999-01-25
2000-11-21
Rivell, John
Valves and valve actuation
With material guide or restrictor
25112921, 123516, 123520, F02M 3304
Patent
active
061491268
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a valve for the metered introduction of fuel evaporated from a fuel tank of an internal combustion engine into an intake tube of the engine. A valve of this kind has already been disclosed (DE-PS 42 29 110), which has a valve seat that is formed on an edge of an inlet cross section of a Laval nozzle, which a cylindrical valve member, which can be actuated by an electromagnet, rests against in the closed position. The valve seat consequently also represents an axial boundary of the Laval nozzle. The embodiment of the nozzle as a Laval nozzle makes it possible to achieve a comparatively high through flow speed in order to thus produce only a relatively low flow resistance at a given flow rate of the valve. The problem of a sensitive regulation of the through flow quantity arises since the relatively large entry cross section of the Laval nozzle must always be covered directly by the valve member. Furthermore, a particular valve stroke of the valve member is required for a particular through flow quantity, but depends on the structural design of the Laval nozzle, particularly the dimensioning of its narrowest cross section, so that an adaptation of the characteristic curve of the valve can only occur by means of a structural change to the Laval nozzle form, which is, however, costly.
ADVANTAGES OF THE INVENTION
The valve according to the invention, has the advantage over the prior art that even with high through flows, only relatively low pressure differentials are needed at the valve. It is particularly advantageous that only a small valve stroke is required to control the through flow so that a valve can be produced which switches particularly rapidly and in which additionally, only slight dispersions of the through flow quantity occur. Advantageously, a valve characteristic curve can be produced in which, depending on the pressure differential, there is a quicker rise in the through flow characteristic curve at lesser pressure differentials and there is a uniform through flow at higher pressure differentials.
It is of particular advantage that the valve characteristic curve of the valve according to the invention can be easily changed.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention is represented in a simplified manner in the drawings and will be explained in more detail in the description below.
FIG. 1 is a longitudinal section through the valve according to the invention,
FIG. 2 is a perspective representation of a valve seat body of the valve according to a first embodiment, and
FIG. 3 is a bottom view of a valve seat body of the valve according to a second embodiment.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The valve 1 schematically represented in the longitudinal section in FIG. 1 is used for the metered introduction of fuel evaporated from a fuel tank of an internal combustion engine into an intake tube of the engine and is part of a fuel evaporation retention system, not shown in detail, of a mixture-compressing internal combustion engine with externally supplied ignition. The design and the function of this kind of fuel evaporation retention systems can be taken, for example, from the Bosch Technical Instruction, Motormanagement Motronic [Motor Management & Motor Electronics], second edition, August 1993, pp. 48 and 49. The design and function of a valve 1 of this kind, which is also called a regenerating valve or a tank ventilation valve, is furthermore known to one skilled in the art from the German Patent Disclosure 40 23 044, whose disclosure is intended to be a component of the current patent application.
Coaxial to a valve longitudinal axis 2, the valve 1 has a two-part valve housing with a cylindrically stepped, sleeve-shaped lower housing part 4 and a cover-shaped upper housing part 5. The upper housing part 5, for example, is placed onto the lower housing part 4 and thereby engages the lower housing part 4 on its outer surface. Both housing parts 4, 5 are preferably comprised of plastic and are, for example, non-deta
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Esperilla Maria
Krimmer Erwin
Miehle Tilman
Schulz Wolfgang
Zimmermann Manfred
Greigg Edwin E.
Greigg Ronald E.
Rivell John
Robert & Bosch GmbH
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