Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-02-09
2001-11-27
Miller, Carl S. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S456000, C123S468000
Reexamination Certificate
active
06321719
ABSTRACT:
BACKGROUND OF THE INVENTION
The current invention relates to a pressure damper for a pressure vessel, in particular for a fuel distributor for an internal combustion engine.
PRIOR ART
Known pressure dampers, particularly of the kind that are used in a fuel distributor tube of a fuel injection system, usually contain a damper bellows made of metal, which is affixed in a leakproof manner to a two-part sealing cap. The sealing cap contains a central disk which is inserted with its outer circumference into a support ring that has a radial flange and a cylindrical section with an outer circumference groove for containing a sealing ring. The sealing cap is inserted into a connecting sleeve, which is affixed to an open end of the fuel distributor tube so that the damper bellows is disposed at least partially inside the fuel distributor tube. The sealing cap rests with its cylindrical section against a corresponding inner wall of the connecting sleeve, while its flange is pressed against a corresponding flange section of the connecting sleeve. To this end, a fastening ring is provided, which is inserted between the radial flange of the sealing cap and a flange that extends radially inward on the connecting sleeve.
With this known pressure damper, the sealing cap is relatively expensive to produce and furthermore requires an additional fastening ring for mounting.
OBJECT AND SUMMARY OF THE INVENTION
The pressure damper according to the invention has the advantage over the prior art that it is easier to manufacture since it contains a reduced number of separate parts. In particular, the pressure damper can be produced more easily and less expensively if the sealing cap is manufactured as a deep-draw part made of metal.
It is particularly advantageous if the sealing cap, which is preferably embodied as a deep-draw part, has a cup section, with which it can be inserted into a sleeve section associated with the opening to be closed, and has a radial flange, which adjoins an edge of the cup section remote from the cup bottom and is used to fasten the sealing cap onto the sleeve section. The sleeve section here can be constituted by a corresponding connector on an arbitrary pressure vessel, by the end section of a fuel distributor tube, or by a connecting sleeve that is fastened to the pressure vessel in the vicinity of the opening to be closed. The cup-shaped embodiment of the sealing cap makes it possible to simply embody it as rigid enough to withstand the pressures in the pressure vessel, particularly in the fuel distributor tube of a fuel injection system, without being deformed.
A particularly attachment for securing the sealing cap of the pressure vessel to the sleeve section is produced if the sealing cap rests with its radial flange against a corresponding radial flange on the sleeve section and the two flanges are fastened to each other by means of reshaping. In particular, flanging and caulking can be used as reshaping techniques in this connection. If the two flanges are to be flange-connected to each other, then a corresponding flanging ring can be provided, for example, but it is also possible to provide a corresponding axial rib on the radial flange of the sleeve section or also on the radial flange of the sealing cap, which rib can then be flanged around the respective other flange. In a corresponding manner, a rib can be provided on one flange, protruding axially beyond the respective other flange, and the material of this rib can then be pressed by means of caulking over the respective other rib.
It is particularly advantageous if a radial shoulder is provided on the sealing cap and this shoulder, together with an opposing shoulder embodied on the sleeve section, forms an annular chamber for containing a sealing ring. In addition, it is particularly advantageous if the shoulder is provided on the cup section that can be inserted into the sleeve section. In this manner, not only can a chamber for a sealing ring that is required between the sleeve section and the sealing cap be produced in a particularly simple manner, but also the rigidity of the sealing cap is thus further increased.
It is particularly advantageous if the sleeve section is constituted by a connecting sleeve that is attached to the pressure vessel so that it encompasses the opening of this pressure vessel that is to be closed. The connecting sleeve is thus completely associated with the pressure damper and can then be embodied so that it completely encompasses the damper bellows. In particular, this has the advantage that the entire pressure damper can be completely preassembled, wherein the damper bellows is protected from damage in transport by the connecting sleeve. In particular, this assures that when the pressure damper is being mounted onto the pressure vessel, i.e. for example onto the fuel distributor tube, the damper bellows cannot be damaged through negligence.
Another simplification of the pressure damper according to the invention is produced if the damper bellows is connected to the sealing cap so that its bottom is used as a sealing part of the damper bellows. It is particularly suitable in this connection if the damper bellows is a metal bellows which can then be simply welded to the sealing cap.
On its end remote from the sealing cap, the damper bellows can be closed, for example, by means of a disk, which is manufactured as a turned or stamped part or as a stamped and drawn part. It is particularly advantageous, however, if the damper bellows is a metal bellows that is closed on the end remote from the sealing cap, since the number of components required for the pressure damper can be further reduced in this manner.
The invention will be better understood and further objects and advantages thereof will become more apparent from the ensuing detailed description of preferred embodiments taken in conjunction with the drawings.
REFERENCES:
patent: 4608957 (1986-09-01), Kemmner
patent: 4729360 (1988-03-01), Fehrenbach et al.
patent: 5233963 (1993-08-01), Gregorius et al.
patent: 5575262 (1996-11-01), Rohde
patent: 5579739 (1996-12-01), Tuckey et al.
patent: 5617827 (1997-04-01), Eshleman et al.
patent: 5845621 (1998-12-01), Robinson et al.
patent: 5896843 (1999-04-01), Lorraine
Section Through Centerline of Fuel Rail, K3/EVA1, Jun. 26, 1997.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
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