Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1992-01-31
1992-12-01
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123456, F02M 3900
Patent
active
051672138
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a fuel injection device for internal combustion engines.
In a known fuel injection device of this kind (DE 34 28 597 C2), the connecting member is designed as a U-shaped spring clip, the web of which extends transversely to the longitudinal extension of the fuel injection valve and the legs of which, on the one hand, engage in a circumferential groove on the valve casing of the fuel injection valve by tabs bent radially inwards at the edge and, on the other hand, have openings into which a locking collar running round the connection piece can be snapped. For the radial fixing of the spring clip in the circumferential groove of the valve casing, the tabs have portions which extend concavely and in a circular arc, the radius of which corresponds to that of the circumferential groove. During assembly, the spring clip is first of all pushed onto the fuel injection valve, the legs snapping into the circumferential groove with their tabs. The fuel injection valve provided with the spring clip is then pushed axially into the connection piece. To ensure that the legs can slide over the locking collar, they are bent outwards in the direction of insertion and are spread apart by the locking collar during insertion. As soon as the locking collar has snapped into the openings, the legs spring back into their initial position.
Although, in such a fuel injection device, axial securing of the fuel injection valves against being unintentionally pulled off the fuel distributor is ensured, securing against rotation of the fuel injection valves in the circumferential direction, as can occur, for example, during assembly or during the fitting or removal of the connecting cables for the fuel injection valves, is not. However, when so-called multi-spray fuel injection valves are used, exact positioning of the individual spray planes of the fuel injection valves in relation to the intake geometry of the internal combustion engine is required, and this positioning must not be changed since any deviation from this position due to rotation in the circumferential direction leads to deterioration in the mixture preparation and to non-uniform distribution of the fuel between the individual cylinders of the internal combustion engine.
It has furthermore been proposed (patent application Ser. No. P 39 18 410.2) that for fixing the fuel injection valve in the circumferential direction in a fuel injection device, shaped elements, with which in each case one fixing element on the spring clip interacts, be provided on the connection piece and on the valve casing. This results in great expense, since the shaped element is necessary on the connection piece in addition to the locking collar and an upper and lower fixing element are necessary on the spring clip.
ADVANTAGES OF THE INVENTION
The fuel injection device according to the invention, has the advantage that the fuel injection valves inserted into the connection piece and held by means of the connecting members are installed in a precise fashion in the circumferential direction in terms of tolerances and in a simple, cost-effective and functionally reliable manner, and rotation simply by the exertion of force from outside, e.g. by fitting or removing the connecting cables, is no longer possible. The connecting members are simple to manufacture and make possible easy and automatic assembly. The shaped elements on the fuel injection valves can be allowed for in the mould itself and do not lead to any significant additional costs in manufacture. There are no special shaped elements on the connection pieces and only one fixing element is required on the connecting member. The correct positioning of the fuel injection valves as regards the intake geometry of the internal combustion engine can be reproduced with high precision even after disassembly for servicing purposes and is reliably maintained even under rough operating conditions.
Advantageous further developments and improvements of the fuel injection device are possible by means of the measures pr
REFERENCES:
patent: 4474160 (1984-10-01), Gartner
patent: 4570602 (1986-02-01), Atkins
patent: 4823754 (1989-04-01), Minamoto
patent: 4984548 (1991-01-01), Hudson
patent: 4991557 (1991-02-01), Degrace
patent: 4993390 (1991-02-01), Ono
patent: 5005878 (1991-04-01), Smith
patent: 5035224 (1991-07-01), Hornby
patent: 5040512 (1991-08-01), Twilton
patent: 5058554 (1991-10-01), Takeda
patent: 5074269 (1991-12-01), Herbon
Bassler Helmut
Friedmann Jochen
Naeger Thomas
Greigg Edwin E.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
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