Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2000-02-14
2001-11-20
Miller, Carl S. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C411S221000
Reexamination Certificate
active
06318340
ABSTRACT:
FIELD OF THE INVENTION
The invention concerns a fastening element made as a tension nut or as a tension screw having a bush-like stepped geometry and comprising on an inner or an outer peripheral surface, at least one threaded section ending in the region of an end of the fastening element.
BACKGROUND OF THE INVENTION
A fastening element of the pre-cited type is known from GB 2 133 479 A. This fastening element is installed in a cylinder head of an auto-ignition engine and serves to receive a pump
ozzle unit for the injection of diesel oil.
A drawback of this prior art element is that it has a relatively solid structure and is made by a chipping method. For large series production, this means a considerable consumption of material and relatively high manufacturing costs. Moreover, a person skilled in the art will see from this prior art document, that this fastening element has a relatively large overall height.
OBJECTS OF THE INVENTION
It is an object of the invention to provide a fastening element of the pre-cited type which eliminates the aforesaid drawbacks.
This and other objects and advantages of the invention will become obvious from the following detailed description.
SUMMARY OF THE INVENTION
In a first embodiment of the invention, the fastening element is a tension nut which is made of deep-drawn steel sheet on whose inner peripheral surface the threaded section is made by rolling, said tension nut further comprises on an outer peripheral surface, an integrally formed dog or catch device which starts from or near the end of the fastening element in whose region the threaded section ends, said dog or catch device comprises at least one tab-like section which is bent over onto the outer peripheral surface of the tension nut.
In a second embodiment of the invention, the fastening element is a tension screw which is made of deep-drawn steel sheet on whose outer peripheral surface the threaded section is made by rolling, said tension screw further comprises on an inner peripheral surface, an integrally formed dog or catch device which starts from or near the end of the fastening element in whose region the threaded section ends, said dog or catch device comprises at least one tab-like section which is bent over onto the inner peripheral surface of the tension screw.
These measures of the invention create a fastening element which is economic to manufacture and has a relatively small overall height. A special feature of the invention is that the dog or catch device for fixing the fastening element relative to the cylinder head or for screwing onto the pump
ozzle unit (inner thread) is arranged in the region of the threaded section and starts from the end of the fastening element situated in this region. In the case of fastening elements made as solid machined parts, it is no problem, as such, to arrange a dog device, for example in the form of a polygon, in the region of the peripheral surface of the fastening element opposed to the region of the threaded section. But such measures cannot be implemented on the deep-drawn, thin-walled sheet steel element proposed by the invention.
According to a further feature of the invention, the tab-like sections can be made so that, as viewed in axial direction, they overlap the threaded section on the peripheral surface of the fastening element opposed to the surface on which the threaded section is situated. In this way, the fastening element is not influenced or deformed in the region of the threaded section and, additionally, the overall height of the fastening element is reduced compared to the prior art.
According to another feature of the invention, the tab-like section can have a rectangular or tooth-like geometry. It is, however, also possible to implement other shapes as long as a positive engagement with a connecting component is guaranteed. The tab-like section may equally well be positioned orthogonally relative to the outer peripheral surface of the fastening element and thus serve, for instance, to prevent rotation of the fastening element.
A preferred use of the fastening element of the invention is its installation in a cylinder head of an auto-ignition engine. In this case, the fastening element is configured so that a pump
ozzle unit for the injection of gaseous fuel can be inserted within its inner peripheral surface.
It goes without saying that the invention also relates to a fastening element made of thin-walled materials other than the steel sheet proposed herein. Thus, it is conceivable to use a thin-walled extrusion molded part or a part made of a light-weight material such as a polymer. Further, the tab-like section may be made in the form of a tongue punched out of the wall of the fastening element and may not be arranged directly in the region of the end of the threaded section.
The invention will now be described more closely with reference to the appended drawings.
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Pflug Rainer
Zielfleisch Hans-Jörg
Bierman, Muserlian and Lucas
Ina Walzlager Schaeffler OHG
Miller Carl S.
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