Valves and valve actuation – With non-fluid retarder
Patent
1997-11-26
1999-03-09
Lee, Kevin
Valves and valve actuation
With non-fluid retarder
25112915, F16K 3106
Patent
active
058789910
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a magnet valve, for tank ventilation in motor vehicles.
In a known magnet valve of this type, for the metered introduction of volatilized fuel into the intake conduit of an internal combustion engine of a motor vehicle (German Patent Disclosure DE 42 44 113 A1), the second damping portion of the damper element disposed on the valve member, which portion protrudes past the side of the valve member toward the magnet core, forms a narrow ring, which because of its relatively small cross section is vulnerable to wear, so that with increasing age the magnet valve tends to generate increased noise, since wear to the ring causes metal parts to strike one another when the valve opens. For the sake of improved long-term noise abatement, however, the wall thickness of the sheathlike lining of the through opening in the valve member, and hence the cross section of the protruding ring, cannot be increased arbitrarily, since this reduces the magnetic force of the electromagnet, which finally no longer suffices for fast valve opening.
ADVANTAGES OF THE INVENTION
The magnet valve according to the invention has the advantage over the prior art that by embodying the axial grooves in accordance with the invention, more damping material can be accommodated in the second damping portion, without significantly losing ferromagnetic armature material in the valve member, material that is required for adequate magnetic flux in the valve member for the sake of fast motion of the valve member. Between the axial grooves, distributed over the circumference of the through opening, adequate material cross sections remain, so that the magnetic resistance of the valve member is increased only insignificantly. Compared with the known magnet valve, the second damping portion is enlarged, with the same wall thickness of the damping material lining in the through opening, by the additional damping faces, which result on the face end of each axial groove as a result of the damping material that protrudes there. Moreover, the height of the ring of material of the through opening lining, which ring protrudes on the face end, can be reduced, which increases the magnetic force.
By means of the provisions recited herein, advantageous further features of and improvements to the magnet valve disclosed are possible.
In an advantageous embodiment of the invention, the extent to which the damping material in the individual axial grooves protrudes past the face end of the valve member toward the magnet core is dimensioned as 0.1 mm, while the extent of protrusion of the annular second damping portion on the same face end of the valve member is 0.2 mm. This annular damping portion is preferably embodied with an annular cross section that tapers in wedgelike fashion, with the tip of the wedge pointing away from the valve member. Preferably, a total of four axial grooves are provided, each offset from one another by 90.degree. along the circumference of the through opening; the width of these grooves is much less than the spacing, in the circumferential direction, between the axial grooves. All of these provisions in terms of dimensions and shaping result in an optimization between long-term noise abatement on the one hand and on the other the maximum force to be brought to bear by the electromagnet in order to move the valve member quickly counter to the spring force acting upon the valve member.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in further detail in terms of an exemplary embodiment shown in the drawing. Shown are:
FIG. 1, a longitudinal section through a tank venting valve;
FIG. 2, an enlarged view of detail II of FIG. 1;
FIG. 3, a plan view of a valve member in the valve of FIG. 1 or 2;
FIG. 4, a side view of the valve member of FIG. 3, partly in section along the line IV--IV of FIG. 3.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The tank venting valve shown in longitudinal section shown in FIG. 1, as an exemplary embodiment of an arbitrary magnet valve, is used for metered admixture o
REFERENCES:
patent: 4563133 (1986-01-01), Yasuhara
patent: 5246199 (1993-09-01), Numoto et al.
patent: 5503366 (1996-04-01), Zabeck et al.
patent: 5560585 (1996-10-01), Krimmer et al.
Krimmer Erwin
Miehle Tilman
Schulz Wolfgang
Greigg Edwin E.
Greigg Ronald E.
Lee Kevin
Robert & Bosch GmbH
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