DE2320517A1 - GAME-FREE, INSULATED BEARING - Google Patents

Description

Backlash-free, insulated bearing The invention is concerned with the Backlash-free and isolated bearing of axes, shafts and spindles.

For example, in the case of high-frequency filters, the hollow x conductor technology often has to be used a tunable inner conductor can be stored in an insulated manner. For many use cases such or similar facilities are subject to large temperature fluctuations.

As an insulating bearing material, often used as a dielectric of a desired Teflon is particularly suitable.

This material has, in addition to the good property of a low coefficient of friction the disadvantage of a large salt flow with mechanical stress, as well as the disadvantage a large coefficient of thermal expansion inherent in almost all plastics A Backlash-free, insulated bearing is listed in the magazine "Feinwerktechnik" 69th year 1965, issue 10, page 387 shown in Fig. 9. This camp essentially consists made of a very thin-walled Teflon tube, which also has sealing lips on the outside is provided.

The production of such a thin-walled Teflon tube is very difficult a lot of effort involved. In addition, the cold flow of the Teflon is prevented in that it is almost entirely enclosed in metal, but this creates the radial pressure of the plastic at temperature, temperature increases increase very sharply and the friction torque when turning a bearing part unacceptably high. If the temperatures drop If the value falls below an average value for which the bearing is designed, an undesirable value occurs Bearing play on.

The object of the invention is to provide a largely play-free, Specify insulated bearing that is subject to large fluctuations in ambient temperature has small frictional torque and in which the cold flow properties of the insulating Plastic have no influence on the bearing play.

The inventive solution to this problem is characterized by an outer cylindrical bearing part, which over the circumference over part of its Length slit longitudinally several times is and a plastic ring that is introduced at the location of the slots in the outer bearing part so that its outer The circumference and most of the adjoining faces are almost entirely from this bearing part are enclosed, the transition from the outer perimeter to the adjacent surfaces can also be continuous.

The 'plastic ring according to the invention can be both rectangular as also have a semicircular cross-section, with the round side in the outer Storage part is located.

It is particularly advantageous to use Teflon as the material for the plastic ring to use.

The bearing is more resilient in the radial direction when the plastic ring is glued into the outer bearing part.

An exemplary embodiment of the invention will now be given with reference to the figure are portrayed.

A Teflon ring 1 with a rectangular cross-section is turned into an outer one Bearing part 2, which is fixed in the exemplary embodiment, introduced that it is through the Bearing part 2 and the rotating axle 3 except for a very small gap 4 between standing bearing part 2 and rotating axis 3 is firmly enclosed and therefore not can flow cold. The outer, metallic bearing part 2 is several times on the circumference a Part of its length is provided with slots (5), which means that when the temperature rises the Teflon ring (1) can expand radially outwards through a corresponding deformation the slotted part of the outer bearing part (2). The external will be reversed Bearing part (2) and the Teflon ring (i) return to their original dimensions when the temperature drops to return. This is caused by the elastic properties of the metal and by a memory, albeit a small one, of Teflon. If the dimensioning the bearing fits are chosen so that at the lowest possible temperature There is no play between the bearing parts 1, 2, 3, kznn with only a slight increase of the frictional torque can be stored without play in a very wide temperature range To make the bearing more resilient in the radial direction, the Teflon ring (t) are glued in according to the necessary precautions.

Claims (5)

Claims C Backlash-free, insulated bearing, characterized by an outer one cylindrical bearing part, which is several times over the circumference over part of its length is longitudinally slit and a plastic ring, which at the location of the slots in the outer Bearing part is attached so that its outer circumference and most of the adjacent End faces are almost completely enclosed by this bearing part, the transition can also be continuous from the outer circumference to the adjacent surfaces. 2. Backlash-free, insulated bearing according to claim 1, characterized in that that the plastic ring has a rectangular cross-section. 3. Backlash-free, insulated bearing according to claim 1, characterized in that that the plastic ring has a semicircular cross-section, with the round side in the outer bearing part. 4. Backlash-free, insulated bearing according to claims 1 to 3, characterized marked, class of plastic ring is made of Teflon. 5. Backlash-free, insulated bearing according to claims 1 to 4, characterized in that the plastic ring is glued into the outer bearing part is.