Valve for metered introduction of volatilized fuel

Details Valve for metered introduction of volatilized fuel Valve for metered introduction of volatilized fuel

2000-06-05

2001-07-03

Chambers, A. Michael (Department: 3753)

Fluid handling

With means for separating solid material from the fluid

Planar strainer normal to flow path

C251S129210, C123S516000

Reexamination Certificate

active

06253789

ABSTRACT:

PRIOR ART
The invention relates to a valve for the metered introduction of fuel into an internal combustion engine in which the fuel is volatilized from a fuel tank.
One such valve is disclosed for instance by German Patent Application DE 195 33 742 A1, and by German Patent Application DE 197 21 562.9, which had not been published by the priority date of the present application.
These valves are used to regenerate adsorption filters for fuel vapor trapping systems of the fuel tank of motor vehicles. Since such adsorption filters contain activated charcoal particles, soiling of the valve can occur in scavenging processes, as a result of activated charcoal particles that have been torn loose and aspirated.
In known valves, protective screens, protective filters and the like can sometimes be employed only at very great effort, because of the particular design in question.
An object of the invention is to refine a valve of the generic type as defined above such that while being highly versatile in terms of its connectors and holders, the value is as invulnerable to dirt as possible and allows high maximum scavenging quantities.
In a valve for metered introduction of volatilized fuel of the type defined at the outset, this object is attained according to the invention as set forth hereinafter.
Because of the two-part embodiment: of the valve housing, the modularity of the valve is increased, and producing the value is made considerably simpler. Because of this two-part embodiment, it is possible to postpone producing such type-specific differences as holders, connectors and the like, until the end of valve production, by securing the second part. It is also highly advantageous that the first part is closed on the inflow side by a protective screen. This prevents soiling of the valve, and the protective screen can occupy the entire end face on the inflow side of the first housing part.
In an advantageous embodiment, it is provided that the two housing parts are separably joined together. This exemplary embodiment has the great advantage in particular that if the protective screen becomes stopped up, for instance, it is easily possible to open the housing and replace the protective screen.
The connection can preferably be embodied by a bayonet connection. It is understood that other separable connections can also be considered.
In another embodiment, it is provided that the two housing parts are inseparably joined together.
Both to make an inseparable connection and to make a separable connection, a detent connection can advantageously be employed. In the case of an inseparable detent connection, the detent elements are designed such that the detents are destroyed upon separation. Conversely, a separable detent connection can be undone with a suitable tool.
With regard to the disposition and securing of the protective screen, once again the most various embodiments are possible. One embodiment provides that the protective screen is inseparably welded to the first housing part.
Another embodiment provides that the protective screen is separably secured to the first housing part. This embodiment offers the advantage in particular of easy replaceability of the protective screen.


REFERENCES:
patent: 4254938 (1981-03-01), Inada et al.
patent: 4582085 (1986-04-01), Hafner et al.
patent: 5076323 (1991-12-01), Schudt
patent: 5178116 (1993-01-01), Fehrenbach et al.
patent: 5560585 (1996-10-01), Krimmer et al.
patent: 5809977 (1998-09-01), Krimmer et al.
patent: 6149126 (2000-11-01), Krimmer et al.

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