High pressure fuel reservoir

Details High pressure fuel reservoir High pressure fuel reservoir

1998-05-18

2001-05-01

Miller, Carl S. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S456000

Reexamination Certificate

active

06223726

ABSTRACT:

PRIOR ART
The invention is based on a high-pressure fuel reservoir for a vehicle. One such high-pressure fuel reservoir, known from European Patent Disclosure EP 0 507 191, comprises a prefabricated tube onto which connection cuffs are slipped to connect the fuel injection valves, or the high-pressure line arriving from the high-pressure fuel pump. Such a high-pressure fuel reservoir is relatively expensive to produce and moreover, because of the connection parts that have to mounted on it, requires a relatively large amount of installation space. In addition, it must have very thick walls in order to withstand the high pressures under the cyclic loads to which it is exposed. One disadvantage here is that thick-walled bodies subjected to major cyclic pressure loads tend to rip apart, especially in the area of openings in the walls and where there are sharp-edged changes in cross section.
ADVANTAGES OF THE INVENTION
By means of the high-pressure fuel reservoir of the invention, a high-pressure fuel reservoir is obtained that because of the eccentric location of the connecting bores is especially capable of withstanding the cyclic loads. Because of this eccentric location, the individual loads, in the region of a intersection with the inner wall of the high-pressure reservoir, are superimposed on one another only vectorially, resulting in an approximately 30% reduction in the loads. This substantially increases the strength and thus prolongs the service life of the high-pressure reservoir.
An advantageous feature is that the connecting bores discharge at a tangent to the inner wall of the tubular body. This further reinforces the aforementioned effect. To avoid abrupt cross-sectional transitions and thus to further reduce the partial heavy load on wall cross sections, an embodiment set forth herein is especially advantageous, in which the tubular body is shaped by forging, with connection stubs likewise formed by forging. This has the further advantage of requiring less installation shape, since the connections, because they are integral with the tubular body, can be made substantially smaller. In addition, the high-pressure reservoir is thus lower in weight.


REFERENCES:
patent: 4475516 (1984-10-01), Atkins
patent: 4899712 (1990-02-01), DeBruyn
patent: 4979295 (1990-12-01), Stagni
patent: 5033435 (1991-07-01), Ostarello
patent: 5143039 (1992-09-01), Gmelin
patent: 5176121 (1993-01-01), Kennedy
patent: 5197435 (1993-03-01), Mazur
patent: 5209204 (1993-05-01), Bodenhausen
patent: 5295467 (1994-03-01), Hafner
patent: 5408971 (1995-04-01), Jaeger

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