Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2003-03-19
2004-02-03
Miller, Carl S. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S456000, C285S104000
Reexamination Certificate
active
06684861
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a mounting device for securing a fuel injector in a cylinder head of an internal combustion engine, and for connecting the fuel injector to a fuel distribution line.
BACKGROUND INFORMATION
German Patent No. 29 26 490 describes a mounting device for mounting a fuel injector on an intake manifold, which axially attaches the fuel injector to the fuel distribution line or to a plug nipple by using a mounting element designed as a U-shaped clamp having two legs which are elastic in the radial direction. In the assembled state, the clamp reaches through corresponding recesses of the plug nipple and can be snapped in a recess in a connection fitting of the fuel injector, the recess being designed as a ring groove. The axial clearances between the recesses and the clamp as well as between the ring groove and the clamp are kept small, in order to achieve accurate fixation of the fuel injector without stresses on the gasket.
The stressing effect of the different mounting parts on the fuel injector is a particular disadvantage of the mounting device described in German Patent No. 29 26 490. The power flow generated in the fuel injector results in deformations and thus to changes in the lift of the valve needle including jamming, as well as in a pressure and bending strain of the housing parts, which are generally thin-walled and welded together at several points. In addition, any fixation measure, e.g., the use of a bearing collar, results in an enlargement of the radial dimension of the fuel injector and thus in an increase in required space for mounting.
SUMMARY OF THE INVENTION
The mounting device for a fuel injector according to the present invention has the advantage over the related art that the fuel injector is held down by an elastic steel sleeve having elastic tongues that is clamped between the fuel injector and the fuel distribution line, and therefore no attachment of the fuel injector to the cylinder head is used. Due to the elastic tongues, which are bent opposite one another, the mounting device provides for the transfer of the holding-down force of the fuel distribution line onto the fuel injector.
It is advantageous in particular that the mounting device as well as the elastic tongues are easily manufacturable by sheet metal stamping. Manufacture by deep-drawing and stamping is also possible.
Advantageously, screws or tension claws for mounting at the front of the cylinder head are not needed when using the mounting device according to the present invention.
Furthermore, it is an advantage that the bending of the elastic tongues, formed by stamping from the holding-down sleeve, corresponds to the curvature of the holding-down sleeve. The elastic tongues may be bent inwards by approx. 90°, thereby achieving an optimum spring effect.
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patent: 100 37 497 (2001-04-01), None
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