Valve for metered introduction of evaporated fuel

Details Valve for metered introduction of evaporated fuel Valve for metered introduction of evaporated fuel

2000-10-02

2001-11-27

Moulis, Thomas N. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

C251S129160, C251S054000

Reexamination Certificate

active

06321725

ABSTRACT:

PRIOR ART
The invention relates to a valve for metered introduction of fuel evaporated from a fuel tank of an internal combustion engine into the internal combustion engine.
A valve of this kind is based, for example, on DE 42 44 113 A1 and DE 196 11 886 A1.
Valves of this kind are used for regenerating adsorption filters for fuel vapor retention systems in vehicle fuel tanks.
A cyclical triggering of the electromagnet that influences the valve position can lead to unpleasant operating noise as a result of contact between parts that move in relation to one another.
With the valve provided in DE 42 44 113 A1, in order to reduce this kind of unpleasant operating noise, at least one damping element is provided which passes through the valve closing member in the axial direction and which, on the first end face of the valve closing member, forms a first damping surface oriented toward the valve seat body and on the second end face of the valve closing member, forms a second damping surface oriented toward the electromagnet so that a collision of the valve closing member against the valve seat body or against the magnet core is damped.
DE 196 11 886 A1 has disclosed forming axial grooves into the valve member, which are open toward the through opening, pass through the valve member longitudinally, and are filled with damping material that protrudes beyond the second end face of the valve member. By virtue of the damping material being introduced into the continuous axial grooves, the damping material can be accommodated in the second damping section without significant loss of ferromagnetic armature material in the valve member, which material is required in order for there to be a sufficient magnetic flux in the valve member for the valve member to be moved rapidly. In this manner, with the same wall thickness of the damping material lining in the through opening, the damping section is enlarged by the additional damping surfaces which are produced on the end face of each axial groove by the damping material that protrudes there. Furthermore, the height of the material ring of the through opening lining protruding at the end face can be reduced by means of this arrangement, which results in an increase in the magnetic force.
An object of the invention is to develop a valve of this type in such a way that an operating noise is further reduced when there is an increased throughput of air, i.e. for larger regeneration quantities.
ADVANTAGES OF THE INVENTION
In a valve for metered introduction of fuel evaporated from a fuel tank of an internal combustion engine into the internal combustion engine of the type described at the beginning, this object is attained by means of the features set forth hereinafter.
The valve seat body, which is disposed in an axial opening in the magnetic yoke and is supported on a side remote from the valve member against a housing wall of the solenoid valve by means of a supporting element made of damping material, prevents the transmission of cyclical noise into the housing and from this housing into metallic parts of the internal combustion engine to the greatest extent possible during cyclical triggering of the valve. Each collision of the valve member against the valve seat body is transmitted from the valve seat body, which is disposed separate from the magnetic yoke, to the support element made of damping material and only then on to the valve housing. Noise generation is sharply reduced by means of this multiply damped transmission path for structure-borne noise.
An advantageous embodiment provides that the support element at least partially encloses the valve seat body on a side remote from the valve member. A damping is thus produced not only in the valve closing direction but also perpendicular to the valve closing direction.
A particularly advantageous embodiment provides that the support element has the shape of a cup oriented toward the valve member on the inside of which is disposed at least a part of the valve seat body oriented toward the support element.
In particular, this embodiment has the great advantage that a fully automatic and therefore simple manufacture is possible since the support element can be mounted in the valve housing in a simple fashion along with the valve seat body.


REFERENCES:
patent: 4475690 (1984-10-01), Hascher-Reichl et al.
patent: 4890815 (1990-01-01), Hascher-Reichl et al.
patent: 4986246 (1991-01-01), Kessler
patent: 5178116 (1993-01-01), Fehrenbach et al.
patent: 5809977 (1998-09-01), Krimmer et al.
patent: 42 44 113 (1994-06-01), None
patent: 196 11 886 (1997-10-01), None
patent: 0 722 061 (1996-07-01), None
patent: 2 117 090 (1983-10-01), None

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