Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1991-01-31
1992-08-11
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123456, F02M 3900
Patent
active
051369990
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fuel injection device for internal combustion engines as set forth hereinafter.
In a known fuel injection device of this kind (DE 34 28 597 C2), the connecting element is constructed 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 engage a circumferential groove on the valve housing of the fuel injection valve with tabs which are bent radially inwards on the edge, and have openings into which the locking collar on the connecting piece can be engaged. For radial fixing of the spring clip in the circumferential groove of the valve housing, the tabs have circular arc-shaped, concavely extending sections, the radius of which corresponds to that of the circumferential groove. When mounting, the spring clip is first pushed onto the fuel injection valve, the legs engaging with their tabs into the circumferential groove. Then, the fuel injection valve provided with the spring clip is pushed axially into the connecting piece. In order that the legs can slide over the locking collar, they are angled off outwardly in the insertion direction and are spread out, when inserted, by the locking collar. As soon as the locking collar is engaged in the openings, the legs spring back into their initial position.
Although an axial securing of the fuel injection valves against unintended pulling off of the fuel distributor is provided in such a fuel injection device, there is no securing against rotation of the fuel injection valves in the circumferential direction, as can occur, for example, when mounting or plugging on or pulling off the connecting cables for the fuel injection valves. When using so-called multi-jet fuel injection valves, however, an exact positioning of the individual jet planes of the fuel injection valves is required for the induction geometry of the internal combustion engine which cannot be changed; since any deviation from this position due to rotation in the circumferential direction leads to a worsening of the mixture preparation.
ADVANTAGES OF THE INVENTION
The fuel injection device according to the invention has the advantage that the fuel injection valves inserted in the connecting pieces and held by means of the connecting elements are installed accurately, with tolerances, in the circumferential direction and a rotation due to simple action of forces from outside, e.g. as a result of plugging on or pulling off the connecting cables is no longer possible. The connecting elements can be produced easily and permit easy and automatic mounting. The moulded elements on the fuel injection valves and on the connecting pieces can already be allowed in the form of a tool and do not lead to appreciable additional production costs. The correct positioning of the fuel injection valves in respect of the induction geometry of the internal combustion engine can also be reproduced with a high degree of accuracy after disassembly for servicing purposes and is reliably maintained even under rough operating conditions.
By means of the measures disclosed herein, advantageous further developments and improvements of the fuel injection device are possible.
DRAWING
The invention is explained in greater detail in the following description with reference to exemplary embodiments illustrated in the drawing, in which:
FIG. 1 shows, a side view of a part of a fuel injection device, partially in section,
FIG. 2 shows a view of the fuel injection device in the direction of the arrow II in FIG. 1,
FIG. 3 shows a front view of a connecting element between a fuel injection valve and fuel distributor in the fuel injection device in FIGS. 1 and 2,
FIG. 4 shows a side view of the connecting element in FIG. 3,
FIG. 5 shows a top view of the connecting element in FIG. 3,
FIG. 6 shows an identical view as that in FIG. 2 of a fuel injection device according to a further exemplary embodiment with the fuel injection valve removed,
FIG. 7 shows a section along the line VII--VII in FIG. 6,
FIG. 8 show
REFERENCES:
patent: 4294215 (1981-10-01), Hans
patent: 4474160 (1984-10-01), Gartner
patent: 4570602 (1986-02-01), Atkins
patent: 4823754 (1989-04-01), Minamoto
patent: 4899712 (1990-02-01), De Bruyn
patent: 4984548 (1991-01-01), Hudson
patent: 4991557 (1991-02-01), DeGrace
patent: 4993390 (1991-02-01), Ono
patent: 5035224 (1991-07-01), Hornby
patent: 5038738 (1991-08-01), Hafner
patent: 5040512 (1991-08-01), Twilton
Bassler Helmut
Naeger Thomas
Greigg Edwin E.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
LandOfFree
Fuel injection device for internal combustion engines does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fuel injection device for internal combustion engines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injection device for internal combustion engines will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-340635