Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1998-01-26
1999-10-19
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123520, 123458, F02M 5502
Patent
active
059671211
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a unit and a snap device for a unit. Once such unit in the form of a valve is already known (European Patent Application EP-0 582 297), to which fuel is delivered via an inflow neck provided on the valve, so that the fuel can then be metered out from an outflow neck into an intake conduit of an intake module. The inflow neck of the valve is connected, for instance via a hose, to an absorption filter, which temporarily stores the fuel vapors that have evaporated from a fuel tank of the internal combustion engines and carries them to the valve via the hose. The housing of the valve is embodied as cylindrical and stepped, and it is composed of one outer face of larger cross section and another outer face, of smaller cross section, that forms the outflow neck. The valve is introduced into a recess embodied in stepped fashion to correspond to the outer faces of the valve, the recess being composed of one part of larger cross section and one part of smaller cross section. Between the part of larger cross section and the part of smaller cross section, a shoulder is formed, which acts as a stop when the valve moves into the recess.
In the recess of the intake module, a sealing ring, which is provided solely to seal off the outflow neck in the recess, is mounted on the outer face of smaller cross section of the outflow neck. In the installed state of the valve, the valve rests in the recess on the shoulder with an annular valve face. The outer face of larger cross section of the valve also rests on an inner face of the part of larger cross section in the recess. To secure the valve, the outer face of larger cross section of the valve has an annular bead extending around the circumference and protruding radially from the outer face. A clamping ring, joined to the intake module in a manner connected to the housing and extending only partway in the circumferential direction, is provided, which when the valve is introduced into the recess is bent upward somewhat by the annular bead and subsequently bends back again, so as to hold the valve between the end face of the intake module and the annular bead.
This valve, also known to one skilled in the art is a tank venting valve or regeneration valve, is embodied electromagnetically actuatably and has an electromagnet, which acts upon an armature with a valve closing member, so that the fuel flowing into the valve via the inflow neck can be dispensed in clocked fashion from the outflow neck into the intake conduit of the intake module. The clocked mode of triggering the valve has the disadvantage, however, of producing relatively loud noise in valve operation. When the valve is accommodated in a recess of the intake module as described, the outer face and the annular face of the valve are in contact with the inner face and the shoulder of the recess, respectively, thereby even increasing the operating noise of the valve. Moreover, forming an annular bead on the valve housing is relatively complex to accomplish in engineering terms, and makes for relatively high production costs in mass production. Mounting and unmounting the valve by means of a clamping ring is also relatively complicated and expensive.
The aforementioned disadvantages also apply to units in the form of injection valves (U.S. Pat. No. 5,156,133, British Patent GB 1 603 501), exhaust recirculating valves (WO 95/27134), and other valves (U.S. Pat. No. 5,497,746) . Even in internal combustion engines equipped with so-called ram intake tube supercharging in which a switchover valve (German Patent Disclosure DE-OS 41 05 938) can switch between two lengths of section tube, for instance, the aforementioned disadvantages still occur.
ADVANTAGES OF THE INVENTION
The unit and the snap device having the characteristics of, have the advantage over the prior art that in a simple way, the unit is disposed and secured with noise abatement, and the unit causes only quiet operating noise and can be mounted and unmounted without major effort or expense.
It is particularly advantageous
REFERENCES:
patent: 4747384 (1988-05-01), Hafner
patent: 4829965 (1989-05-01), Gartner
patent: 4950171 (1990-08-01), Muzslay
patent: 5012789 (1991-05-01), Fehrenbach
patent: 5058555 (1991-10-01), Haboush
patent: 5299542 (1994-04-01), Hafner
patent: 5413082 (1995-05-01), Cook
patent: 5551400 (1996-09-01), Rice
patent: 5724946 (1998-03-01), Franchitto
patent: 5727532 (1998-03-01), Everingham
patent: 5803056 (1998-09-01), Cook
Bald Rolf
Hafner Udo
Koch Bernd
Krimmer Erwin
Miehle Tilman
Greigg Edwin E.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
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