MXPA99008259A - Support bearing and process for your manufacture - Google Patents

Abstract

Process for the manufacture of a bearing bearing, comprising an inner ring (1), which is surrounded by an outer ring (2) at a radial distance, wherein the inner (1) and outer (2) rings are joined by means of an intermediate ring (4) of elastic rubber material placed in the slit (3) formed by the distance. The inner (1) and outer (2) rings are placed in a vulcanization tool with one of the contractions that condition the manufacturing that corresponds to an axial shift (5), where the intermediate ring (4) is vulcanized, inclined towards the axial displacement (5) in a radial plane (17) established with the inner (1) and outer (2) rings, wherein the vulcanized bearing bearing is removed from the vulcanization tool, and where such axial shifting ( 5) between the inner (1) and outer (2) rings is completely balanced by itself, conditioned by the contraction, by means of the inclined intermediate ring (4) conditioned by the manufacture during its cooling and solidification.

Description

SUPPORT BEARING AND PROCESS FOR ITS MANUFACTURE Description Technical field. The invention relates to a process for the manufacture of a bearing bearing, which comprises an inner ring, which is surrounded by an outer ring at a radial distance, wherein the inner and outer rings are joined by means of an intermediate ring of elastic rubber material placed in the slit formed by the distance.

State of the Art Said bearing bearing is known, for example, from DE 20 61 625 B2. The previously known bearing arrived as an intermediate bearing application for the automotive drive shaft, wherein the intermediate ring is formed by means of several flanges of elastic rubber material uniformly spaced at the circumference. The flanges extend between the inner ring and the outer ring both in the longitudinal section and in the cross section considered in the radial direction, where a shock absorber stop is placed between adjacent flanges with distance from each other, which is fixed in the ring. outer support, which extends in the radial direction inwards and which is coupled with the inner ring in the vibration-free condition adjacently with a radial distance. However, it must be taken into account that the characteristics of use of the previously known bearing during a long period of use are unsatisfactory. In addition, in the manufacturing process and during the use of the bearing, they are presented within the intermediate ring, which is composed of flanges, tensile stresses that reduce the life time, and which can lead to premature wear of the bearing.

Presentation of the invention The invention presents the task of developing and improving a bearing bearing of the type mentioned in the introduction, and a process for its manufacture such that the intermediate ring is free of tensile stresses -even without calibrating the inner and / or outer ring -.

This task is solved, according to the invention, with the features of claim 1 and by means of the features of claim 3. The claims referring to claims 1 and 3 are advantageous additional embodiments / embodiments.

For the resolution of the task is provided, that the inner and outer rings, are placed in a vulcanization tool with one of the contractions that condition the corresponding manufacture of axial shifts, which vulcanizes the intermediate ring on the axial shifts, that the ring intermediate is vulcanized with inner and outer rings around the axial shifting inclined to a radial plane set, that the vulcanized bearing bearing is removed from the vulcanization tool, and that the axial shifting be completely balanced between the inner and outer rings by means of the intermediate inclined ring conditioned by manufacturing during cooling and solidification, conditioned by shrinkage. The intermediate ring produced by the method according to the invention is free of radial tensile stresses and therefore has good and permanent characteristics of use over a long period of use. A contraction of the intermediate ring and conditioned by the manufacture and in combination with the removal of the bearing from the vulcanization tool does not cause tensile stresses, as in the case of vulcanized intermediate rings that are not inclined in the axial direction and in the that the inner and outer rings are placed with each other without axial shifting. By means of the contraction of the intermediate ring the axial displacement of the inner and outer rings is completely balanced by itself.

In the case where the bearing bearing is applied as bearing of the cardan shaft in automobiles, the inner and outer rings can be placed in the vulcanization tool with an axial shift of 0.1 to 0.5 mm. This shift is completely balanced by the contraction of the intermediate ring in combination with its vulcanization, so that the intermediate ring considered in the longitudinal section of the bearing bearing, extends radially between the inner and outer rings. Since the intermediate ring with this manufacturing process does not present tensile stresses that reduce the use time, a calibration of the inner and / or outer rings in combination with the vulcanization is not necessary.

The size of the contraction depends substantially on the material used and on the hardness of the intermediate ring material.

Furthermore, the invention relates to a support cushion, manufactured according to the process described above, comprising an inner ring which is surrounded by an outer ring with a radial distance, wherein the inner and outer rings are joined by half ring intermediate rubber elastic material placed in the gap formed by the distance.

For the resolution of the task it is provided that the intermediate ring -considered in the longitudinal section- presents a greater length conditioned by the manufacture, than in the state of use. According to the manufacturing process, ie immediately after removal of the bearing from the vulcanization tool, before the cooling and solidification of the intermediate ring, the inner and outer rings are alternated with each other in axial direction around the axial symmetry inclined in a radial plane established. During the cooling and solidification of the intermediate ring the length of the intermediate ring conditioned by the contraction decreases, until the intermediate ring extends only in the radial direction in the finished state, that is to say cooled and solidified completely, and that the intermediate ring is placed in the middle. a radial plane with inner and outer rings.

In most cases of application it has been found to be advantageous, when the ratio of the length conditioned by manufacture to the recommended length for use is from 1.05 to 1.15. Regardless of the material used and the hardness of the material of the component, it is ensured by this that the intermediate ring will be free of radial tensile stresses in the state ready for use.

The intermediate ring can be constructed of at least two flanges distributed on the circumference, which are separated by a circumferential distance, wherein the flanges are limited in circumferential direction by means of frontal surfaces extending parallel to the front surface of a adjacent flange, wherein all the front surfaces are formed substantially flat and inclined in the same direction of rotation, and wherein the angle of inclination of all the front surfaces, referred to the circumferential direction is 15 to 75 ° preferably 30 at 60 °. The tensile stresses resulting from manufacturing, which have the influence of decreasing the life time of elastic rubber materials, are reliably avoided with this embodiment. A shrinkage of the flanges caused by manufacturing during vulcanization does not cause tensile stresses, but only causes a rotation of the inner and outer rings relative to each other.

With regard to a simple production and a simple assembly of the bearing bearing it has been shown to be advantageous, when the adjacent flanges are formed one inside the other and are distributed uniformly in the circumference. The outer ring may have at least one break, which is penetrated by the intermediate ring material, where the material of the intermediate ring is transferred to the side of the break inclined towards the flanges. This presents the advantage that a secure mechanical fixation of the intermediate ring to the outer ring is achieved, which also remains unchanged for a long period of use.

To achieve a construction with few parts and convenient in terms of manufacturing techniques and economy, the flanges can present in the radial direction interior and exterior support surfaces, where the internal support surfaces with the lateral surface of the ring interior and the outer bearing surfaces with the inner circumferential surface of the outer ring are adhesively bonded. This avoids the use of support rings and reinforcements.

In order to avoid mechanical overloads of the flanges, stop buttons can be provided on the front surfaces which are offset from one another in the direction of the opposite front surfaces. Large radial and circumferential relative movements of the inner and outer rings can be limited by means of the stop buttons placed on the front surfaces, where the stop buttons on the side facing the surface against stops preferably have a hemispherical profile, way that it uses a final damping position by the touch of the butt buttons of the opposite stop surface.

Description of the figures The patent for the invention of the bearing as well as the claimed process for its manufacture are explained below according to the appended figures.

These figures show exemplary embodiments of the support bearing in schematic form. In Fig. 1 a first view of the embodiment of the invention of the bearing bearing is shown.

In Fig. 2 the embodiment of Fig. 1 is shown in a section along line A-A in a sector shown in the condition conditioned by manufacture.

In Fig. 3 the embodiment of Fig. 2 is shown in a state ready for use, after complete cooling and solidification of the intermediate ring.

In Figure 4 a second embodiment is shown, similar to the embodiment of Figure 1.

Embodiment of the Invention The two embodiments of the bearing are applied, for example, as intermediate shaft bearings for cardan shafts of automobiles. The bearings have a special construction with few parts, where the flanges 10, 11, 19, 20 are vulcanized with their inner and outer bearing surfaces 15, 16 directly on the adjacent surfaces of the inner ring 1 and the outer ring 2. inner ring 1 is in this embodiment, formed by means of the outer bearing of a bearing, while outer ring 2 is formed as a support ring, and in the first embodiment can be molded on a support.

In the second embodiment, the outer ring 2 is surrounded by a rubber channel 23 on the side of the outer circumference, where the rubber channel 23 for its part is surrounded for example by a support under elastic tension.

In Fig. 1 there is shown an intermediate ring 4, which is placed with its inner bearing surfaces 15 on the lateral surface 17 of the inner ring 1 and with its outer bearing surfaces 16 on the inner peripheral surface 18 of the outer ring 2 , and comprising in this embodiment four flanges 10, 11, 19, 20 uniformly distributed on the circumference which respectively limit a slit with its front surfaces 12, 13, 21, 22 placed with one another in the circumferential direction. The flanges 10, 11, 19, 20 are provided with essentially planar frontal surfaces 12, 13, 21, 22, which are all inclined in the same direction of rotation, wherein the angle of inclination 14, relative to the circumferential direction is 45 ° in this embodiment. To limit the relative rotation of the inner and outer rings 1, 2, the front surfaces 12, 13, 21, 22 can be provided with stop buttons which are not shown here, which are essentially vertical to the respective adjacent front surfaces. .

In Figs. 2 and 3 are respectively shown a longitudinal section through a bearing bearing, where the bearing bearing in the production state is shown in FIG. 2, and in FIG. 3 in a state ready for use.

In FIG. 2 it can be noted that the inner ring 1 and the outer ring 2 are arranged with an axial offset 5 with respect to each other. The axial displacement 5 corresponds to the contraction conditioned by the production of the intermediate ring 4 in combination with its vulcanization. The intermediate ring in Fig. 2 is inclined towards the offset 5 to a given radial plane 7, wherein the axial offset 5 as well as the inclination are amplified for better understanding of the invention. During the cooling and solidification of the intermediate ring 4 in combination with the withdrawal of the bearing from the vulcanization tool, the intermediate ring 4 contracts, whereby the length 8 conditioned by the production is shortened to the length 9 which is The recommended length for use. By means of the flanges 10, 11, 19, 20 placed in the circumferential direction under the angle of inclination 14, and of the intermediate ring 4 without radial tensile stresses, the intermediate ring 4 will be free of tensile stresses that decrease its time of life in all directions, and has good and permanent characteristics of use during a period of very long use.

Claims (1)

1. CLAIMS Process for manufacturing a bearing bearing, which comprises an inner ring, which is surrounded by an outer ring at a radial distance, wherein the inner and outer rings are joined by means of an intermediate ring of elastic rubber material placed in the gap formed by the distance, characterized in that, the inner and outer rings, are placed in a vulcanization tool with one of the contractions that condition the manufacturing that corresponds to an axial shift, because the intermediate ring is vulcanized, inclined towards the axial displacement in an established radial plane, because the vulcanized bearing bearing is removed from the vulcanization tool, and because the axial shift between the inner and outer rings is completely balanced by itself, conditioned by the contraction, by means of the intermediate ring inclination conditioned by manufacturing during cooling and solidification. Process according to claim 1, characterized in that the inner ring and the outer ring are placed in the vulcanization tool with an axial shift of 0.1 to 0.5 mm. Support bearing according to one of claims 1 or 2, comprising an inner ring, which is surrounded by an outer ring at a radial distance, wherein the inner and outer rings are joined by means of an intermediate ring of material of elastic rubber placed in the gap formed by the distance, characterized in that the intermediate ring -considered in the longitudinal section- presents a greater length conditioned by the production, than in the state ready for use. Support bearing according to claim 3, characterized in that the ratio of the length conditioned by the production to the length in the ready for use state is from 1.05 to 1.15. Support cushion according to one of claims 3 or 4, characterized in that the intermediate ring is free of tensile stresses in the state ready for use. Support bearing according to one of claims 3 to 5, characterized in that the intermediate ring is constructed of at least two flanges distributed on the circumference, which are separated by a circumferential distance, because the flanges are limited in circumferential direction by means of of front surfaces extending parallel to the front surface of an adjoining flange, because all the front surfaces are formed essentially flat and because the angle of inclination of all the front surfaces, referred to the circumferential direction is 15 to 75 °. Support bearing according to claim 6, characterized in that the angle is from 30 to 60 °. Support bearing according to one of claims 6 or 7, characterized in that the flanges are formed one inside the other and evenly distributed in the circumferential direction. Support bearing according to one of claims 6 to 8, characterized in that the flanges have, in the radial direction, inner and outer bearing surfaces, and because the internal bearing surfaces with the lateral surface of the outer ring and the outer bearing surfaces with the inner circumferential surface of the support ring are adhesively bonded. Support bearing according to any one of claims 6 to 9, characterized in that at least one of the front faces directed toward each other is provided with a surface profiling. Support bearing according to claim 10, characterized in that the surface profiling is formed by means of stop buttons which are arranged in the direction of opposite front surfaces.