Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1997-05-12
1998-09-22
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
137315, F02M 3704
Patent
active
058099786
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to an adsorption filter for a fuel vapor retention system of a fuel tank of an internal combustion engine. An adsorption filter of this kind is already known (German Patent 44 08 429), which has a recess in order to attach a valve in the recess by means of a fastening element, which valve is used to introduce fuel vapors temporarily stored in the adsorption filter in an intake tube of the engine. The fastening element is embodied in the form of a retaining clip, which is formed onto the wall of the recess, is of one piece with it in the interior of the recess, and essentially corresponds to the size of the valve. The retaining clip encompasses the valve on its outer surface with elastic initial stress. For noise reasons, a closing cap is provided to cover the recess having the valve. The valve accommodated in the recess has an outflow fitting for connecting the valve to the intake tube of the engine via a connecting line. The outflow fitting protrudes laterally from the valve out from the recess of the adsorption filter or the closing cap. The connecting position of the connecting line or the outflow fitting on the valve is thus fixed and cannot be altered. An electrical plug connection for the valve has to be guided through the closing cap into the recess to electrically contact the valve.
Furthermore, a connecting flange is provided in the recess for connecting the valve sealingly to a line that reaches into the adsorption medium. A filter that is low in volume is accommodated in the line and is used to purify the fuel vapors flowing into the valve from the adsorption medium via the line. A low-volume filter of this kind, though, has the disadvantage of being affected relatively quickly by contaminants, in particular charcoal particles from the adsorption filter, by means of which an increased flow resistance is produced in the dirt filter, a filter that filters dirt, which causes a pressure loss and thus a reduction of the through flow quantity of the valve.
The described accommodation of the valve in the recess and the fastening of the valve by means of a retaining clip is costly to embody, in particular in mass production assembly, resulting in high production costs. Furthermore, access to the valve from outside is only possible to a limited degree, in order to exchange it for example for repair purposes, since in this connection, the closing cap must first be removed and the valve must be detached from the retaining clip.
ADVANTAGES OF THE INVENTION
The adsorption filter according to the invention, has the advantage over the prior art that the valve is fastened to the adsorption filter in a particularly simple manner so that a rapid and reliable installation and removal of the valve from the adsorption filter is possible, which permits a reasonably priced kind of manufacture in mass production. To this end, without having to carry out extensive structural alterations, already existing valves can be advantageously used or altered in a simple manner. It is furthermore advantageous that different connecting positions of an outflow fitting of the valve can be set by simply rotating the valve so that it is also possible to accommodate the adsorption filter with the valve in installation zones that are otherwise difficult to reach.
Advantageous improvements and updates of the adsorption filter disclosed are possible by means of the measures embodied herein. Because of a particularly large-surfaced dirt filter built into the adsorption filter or on the valve, the valve can be advantageously protected from contaminants in such a way that a perfect functioning and high operational reliability of the valve is always assured during the provided service life of the valve. Furthermore, only an extremely slight pressure loss is produced by the large-surfaced dirt filter so that a reduction of the through flow quantity of the valve can be prevented.
A sealing plug that is preferably comprised of elastic plastic and is for fastening the valve to the adsorption filter permits a par
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Krimmer Erwin
Miehle Tilman
Schulz Wolfgang
Greigg Edwin E.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
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