Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1994-08-12
1996-10-01
Lee, Kevin
Valves and valve actuation
Electrically actuated valve
Including solenoid
25112915, F16K 3102
Patent
active
055605850
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a valve for metering introduction of fuel evaporated from the fuel tank of an internal combustion engine into an induction duct of the internal combustion engine. Such a valve is already known (DE 40 23 044 A1) now U.S. Pat. No. 5,178,116 in which, particularly in the case of a pulsed activation of an electromagnet influencing the valve position, disturbing operating noises can occur as a consequence of contact between metallic parts moving relative to one another.
ADVANTAGE OF THE INVENTION
The valve according to the invention has an advantage that a disturbing creation of noise is avoided when the valve is operated.
In addition, the valve according to the invention has improved wear resistance because impact between metallic parts moving relative to one another is prevented or attenuated.
Advantageous further developments and improvements to the valve given are possible by means of the measures listed hereinafter.
DRAWING
Embodiment examples of the invention are represented in a simplified manner in the drawing and are explained in more detail in the following description.
FIG. 1 shows a longitudinal section of a first embodiment example of a valve according to the invention,
FIG. 2 shows a partial section of the first embodiment example corresponding to the chain-dotted line in FIG. 1 and
FIG. 3 shows a partial section of a second embodiment example of a valve according to the invention; and
FIG. 4 illustrates protruding bores as shown in FIG. 2 along lines IV--IV.
DESCRIPTION OF THE EMBODIMENT EXAMPLE
The valve represented in FIG. 1 for the metered admixture of fuel evaporated from the fuel tank of a mixture-compressing, externally ignited internal combustion engine to a fuel/air mixture supplied to the internal combustion engine via an induction duct, called a tank ventilation valve in what follows, is used in a delivery system for introducing evaporated fuel into an internal combustion engine, as is described in DE 35 19 292 A1 (U.S. Pat. No. 4,763,635). The tank ventilation valve has a two-part valve housing 10 with a cup-shaped housing part 101 and, for closing it, a cap-shaped housing part 102. The housing part 101 supports an inlet mouthpiece 11 for connection to a ventilation mouthpiece of the fuel tank or to a reservoir for the evaporated fuel, which is connected downstream of the fuel tank and is filled with active carbon, while the housing part 102 supports an outlet mouthpiece 12 for connection to the induction pipe of the internal combustion engine. Inlet mouthpiece 11 and outlet mouthpiece 12 are respectively arranged axially in the housing parts 101 and 102. An electromagnet 13 is arranged within the cup-shaped housing part 101.
The electromagnet 13 has a cup-shaped magnet housing 14 with a coaxial, hollow cylindrical magnet core 15, which penetrates the bottom of the cup, and a cylindrical excitation coil 16 which is seated on a coil carrier 17 which encloses the magnet core 15 in the magnet housing 14. A threaded mouthpiece 18, which protrudes outwards and has an internal thread 19, is integrally configured at the bottom of the magnet housing 14 and this internal thread 19 is screwed onto an externally threaded section 20 of the hollow cylindrical magnet core 15. The magnet core 15 can therefore be displaced axially, within the magnet housing 14, by rotation.
The magnet core 15 is aligned with the inlet mouthpiece 11 so that the evaporated fuel entering there passes directly into the magnet core 15 and flows through the latter. The magnet housing 14 and the magnet core 15 screwed onto it are inserted in the cup-shaped housing part 101 in such a way that axial ducts, which are offset relative to one another in the peripheral direction by the same angle, remain between the outer surface of the magnet housing 14 and the inner surface of the valve housing 10. Two diametrically opposite axial ducts 21, 22 are represented, as an example, in FIG. 1. The axial ducts 21, 22 are, on the one hand, in connection with the inlet mouthpiece 11 via an annul
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patent: 4986246 (1991-01-01), de Vivie et al.
patent: 5069188 (1991-12-01), Cook
patent: 5178116 (1993-01-01), Fehrenbach et al.
patent: 5237980 (1993-08-01), Gillier
patent: 5246199 (1993-09-01), Numoto et al.
Krimmer Erwin
Miehle Tilman
Schulz Wolfgang
Greigg Edwin E.
Greigg Ronald E.
Lee Kevin
Robert & Bosch GmbH
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