The invention relates to a coaxial plug-connector part according to the preamble of claim 1.
Current, commercially available coaxial plug-connectors, designated as N-, 1 mm-, 2.92 mm-, SMA-, 1.85 mm-, 3.5 mm- or 2.4 mm-plugs, or respectively as so-called Zwitter plugs with the designation PC7, are all structured according to this principle with a cap nut screw-connected to the outer conductor, wherein the cap nut can, in many cases, also be provided on the bush component.
An arrangement of a ball bearing to reduce the friction between cap nut and outer conductor is known from EP 0 327 204 B1.
The object of the invention is to provide a reliable and durable plug-connector part, which can be fitted as an independent structural group at the contact end of any required coaxial power line systems.
This object is achieved starting from a coaxial plug-connector part according to the preamble of claim 1 by its characterizing features. Advantageous further developments are specified in the dependent claims.
According to the invention, the coaxial plug-connector part specified in claim 1 provides the advantage that it can be prefabricated as an independent, testable structural group; in service, it can be very easily dismantled from the coaxial line system; and, as an enclosed, self-contained structural group in which all structural elements are pre-assembled within the cap nut, it can be fitted to the contact ends of any required coaxial line systems, such as coaxial cables, rigid coaxial line ends on devices or test probes.
Exemplary embodiments of the invention are described in greater detail below with reference to the drawings. The drawings are as follows:
The coaxial plug-connector according to the invention consists of a plug component 1 and a bush component 2. The plug 1 consists of an outer conductor 3, in which the internal conductor 5 is arranged via a supporting washer in a coaxial manner. The coaxial line 3, 5 continues at the rear side of the plug 1, for example, within a device or within a coaxial cable. A cap nut 6, which is attached to the outer conductor 3 by a force-fit connection, is fitted in a rotatable manner to the outer conductor 3. To establish the coaxial connection, the internal thread 8 of the cap nut 6 must be screwed onto the outer thread 9 of the bush 2 until the annular end-face contact surface 10 of the outer conductor 3 of the plug 1 contacts the corresponding annular end-face contact surface 11 of the bush 2. In this context, the tip 12 of the internal conductor 5 is pushed into the radially-sprung, sleeve-shaped bush 13 of the bush component 2.
In the exemplary embodiment illustrated, the cap nut 6 is arranged no longer in a directly rotatable and axial, force-fit manner on the outer conductor 3 of the coaxial line system, but on a bearing bush 20, which, like the cap nut 6, is preferably made of stainless steel. This bearing bush 20 provides a continuous internal borehole, into which the end of the coaxial line system to be connected can be inserted and, for example, screwed via an external thread 21 formed on the outer conductor 3 of the coaxial line system into an internal thread 22 of this continuous borehole of the bearing bush. A bearing cover 23 can be screwed into the open end of the pot-shaped cap nut 6.
In the exemplary embodiment, the roller bearings provided to reduce the frictional torque of the axial, force-fit connection between the cap nut 6 and the bearing bush 20 are designed as needle bearings 24 and 25. They are fitted at both sides of the annular flange 26 formed on the bearing bush 20 on corresponding cylindrical portions of the bearing bush 20. As indicated by the running discs 27 in
To ensure that no play occurs between the co-operating components even with a released connection, another plate spring 28 is preferably provided between the base of the cap nut 6 and the first axial bearing 24 following it. In the assembled condition as shown in
The cap nut 6 and the bearing bush 20 preferably consist of a high-strength metallic material such as stainless steel. Accordingly, there is also a direct thermal contact between the outer surface of the cap nut and the outer conductor of the coaxial line system, which can be very disturbing in many applications, because heat can be transferred from the outside, via the outer conductor 3 of the coaxial line system, to the electronic components connected to it, for example, merely through the warmth of the user's hand.
In order to avoid this, at least one additional component can be provided, according to one further development of the invention, between the mutually connected surfaces of the metallic cap nut 6 and the bearing bush 20 for the thermal decoupling of these components. If the cap nut 6 and the bearing bush 20 consist of readily conductive material, a ring made of synthetic material is arranged, for example, between the bearing cover 23 and the bearing bush 20. By preference, a corresponding synthetic-material ring is also provided for thermal decoupling on the outer periphery of the annular flange 26 of the bearing bush. Another possibility is to manufacture either the cap nut 6 and/or the bearing bush 20 themselves from a high-strength synthetic material.
The invention is not restricted to the exemplary embodiment illustrated. All of the features described and/or illustrated can be combined with one another as required within the framework of the invention.
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/EP09/01844 | 3/13/2009 | WO | 00 | 2/17/2010 |