BR102015018187B1 - SEALING FOR A BEARING BEARING WITH THE INSERT, UNIVERSAL JOINT WITH A BEARING BUSHING AND/OR BEARING BUSHING WITH THE SEAL - Google Patents

Abstract

INTERMEDIATE PART FOR A SEAL OF A BEARING BEARING, SEAL WITH THE INTERMEDIATE PART, CROSS LINK AND BEARING BUSH WITH THE SEAL The embodiment examples refer to an insert (12) for a seal (11) of a bearing bearing with a prestressing structure (19) which is formed to prestress a bearing body (15) of the rolling bearing in the axial direction. The prestress structure (19) is formed as a single piece with the interleaved piece (12).

Description

[0001] The embodiment examples refer to an insert for a bearing housing seal, a seal with the insert, a universal joint and a bearing bush with the seal.

[0002] Seals can be used in a large number of bearing or roller bearing devices. Generally, the seal seals a gap between a housing and a component that is rotatably inserted into the housing. For different reasons, for example to stabilize or reinforce the seal or also to fix the seal in the housing, the seal may comprise an insert or a support ring or the like.

[0003] Insert seals are also used, for example, in a bearing sleeve for a joint, eventually for a universal joint. To ensure the permanent functionality of the universal joint or the bearing bush, it may be necessary to seal the gap due to the construction, respectively, present between the bearing bushing and a pin that is rotatably supported thereon. The seal respectively inserted in this case must prevent an escape of the lubricant preserved inside the bearing bush and, on the other hand, exclude or at least reduce the penetration of impurities from the environment into the interior of the bearing bush.

[0004] Figure 2 shows a schematic representation of a sectional view of a conventional seal 1 with a conventional insert 2 for a bearing bushing 3 in a universal joint. In this case, the entire universal joint is not shown, but only an area 4, in which a pin not shown of the universal joint can be arranged, which can be rotatably supported on the bearing bush 3. Between area 4 for the pin and the bearing bush 3 is arranged a plurality of cylindrical bearing bodies, of which a bearing body 5 can be recognized.

[0005] Seal 1 has an outer seal ring 6 and an inner seal ring 7, which are axially arranged next to each other. The inner sealing ring 7 has a sealing body 8 and the insert 2, which is partially arranged inside the sealing body 8. The inner sealing ring 7 is arranged at an axial distance to the side of the bearing bodies 5 in a inner circumference of the bearing bushing 3 and, in this case, is sealed and torsion-resistant connected with the bearing bushing 3. A section of the insert 2 which projects out of the sealing body 8 of the inner seal ring 7, it engages in a recess in an inner circumference of the bearing bushing 3. The inner sealing ring 7 is thereby secured against axial displacement. This is particularly necessary due to the action of a compressible disk 9, which is arranged axially between the inner sealing ring 7 and the bearing bodies 5. The compressible disk 9 presses the axially opposed bearing bodies 5 against an axial washer not shown, which abuts against a bottom of the bearing bush, also not shown and, in this case, rests on the inner sealing ring 7. Since the bearing bodies 5 are tightened in this way, the bearing bushing 3 including the seal 1 and the bearing bodies 5 can be handled as a unit and as such are pushed onto the pin not shown. The compressible disc 9 is a separate component, which is assembled as a separate part when mounting the seal 1.

[0006] In this case, in all, in a pre-assembly of the bearing bushing 3 with the bearing bodies 5, the sleeve itself, the inner and outer sealing ring 7 and 8 and the compressible disc 9, must be held and a large number of loose parts are assembled. As a result, in certain circumstances, both the assembly and the provision of the various isolated components can be designed relatively expensively. This increased effort in relation to mounting, bearing and making the isolated parts available can naturally also occur in the same way in sealing concepts for other bearings, for example when the seal is arranged in an outer ring of a rolling element bearing.

[0007] Document JP 2002106593 A teaches to provide a universal joint which is capable of preventing wear of a metal ring body and preventing a sealing element from slipping out of a bearing housing, suppressing the tilt of a roller of needle.

[0008] Therefore, there is a need to improve a concept for sealing a rolling bearing, in particular, in relation to a simpler assembly. This need takes into account a seal, a universal joint and a bearing bush according to one of the independent claims.

[0009] The embodiment examples refer to a rolling bearing seal with an insert with a prestressed structure, which is formed to prestress a rolling element bearing body in the axial direction. The prestress structure is formed as one piece with the insert. Because the prestress structure is not a separate component, in some embodiment examples the number of insulated parts may be reduced. A number of assembly steps can thus be optionally reduced or an assembly can be simplified.

[0010] In some embodiment examples, the prestress structure comprises a compressible disk. In certain circumstances, a similar or even equal pretension can be obtained in this way, as in conventional systems, in which a compressible disc is inserted between the insert and the bearing body.

[0011] Additionally or alternatively, the insert may comprise a clamping structure, which is formed to clamp the insert and/or seal in the housing. In some exemplary embodiments, the insert can thus also fulfill a clamping and/or clamping function to clamp the seal at least axially or even optionally in the circumferential direction.

[0012] Additionally or alternatively, the insert is formed at least partially as a stabilizing section to stabilize the seal. In some exemplary embodiments, in this way, optionally, a sealing behavior of the seal can be improved, because a deformation of the seal, at least in some areas, can be limited by the stabilizing section.

[0013] The embodiment examples furthermore refer to a seal for a rolling element bearing with the insert, according to at least one of the embodiment examples. The seal comprises a seal body which is formed to seal a gap between a housing and a component which is rotatably arranged in the housing. Due to the fact that the seal must not be mounted with a compressible disc or a pretension structure, but the pretension structure is fixed to the insert, the seal, in some examples of embodiment, can be mounted more simply and with a smaller number of isolated parts.

[0014] Additionally, the insert may comprise at least one arm that projects outwards in axial direction to the bearing body, which forms the pretension structure. In some embodiment examples, the prestress structure can be produced in a simple manner and manner. In certain circumstances, further components of the pretension structure may still be comprised, for example, a part of the section which is arranged inside the sealing body and/or a part of the sealing body itself.

[0015] Additionally, in some examples of embodiment, the insert has at least one other section that projects out of the sealing body, which serves as a fastening structure. Optionally, by means of the fixing structure which extends through an axial extension of the sealing body, a simple and/or improved fixing of the seal in the housing can be made possible, optionally even without deforming the sealing body.

[0016] Additionally or alternatively, in some embodiment examples a front surface of the prestress structure aligned in an axial direction rests, at least partially, on a front surface aligned in an axial direction of the sealing body arranged radially inside of the insert. In certain circumstances, the prestressing structure may thus be allowed to contribute to rigidity and/or stabilization of the seal or seal body.

[0017] Additionally or alternatively, the sealing body can be connected with the prestressing structure in positive union. In some exemplary embodiments, in this way, the insert can be assembled with the pretension structure and the sealing body as a component.

[0018] The embodiment examples also refer to a universal joint with a bearing bushing or the bearing bushing with the seal according to at least one of the embodiment examples, the seal being at least partially inserted into the bearing bushing. bearing. In some embodiment examples, in this way, the number of insulated parts can be reduced in a universal joint or in a bearing sleeve. In certain circumstances, an assembly expense can also be reduced by doing so.

[0019] The examples of modality published in the descriptive report above, in the following claims and in the attached Figures, as well as their individual characteristics, both individually and in any combination can be important and be implemented for the realization of an example of modality in their different settings.

[0020] Thus, the Figures schematically show the following views.

[0021] Figure 1 shows a schematic diagram of a sectional view of a seal with an insert according to an example of embodiment in a bearing bushing;

[0022] Figure 2 shows a schematic diagram already described of a sectional view of a conventional seal in a bearing bushing.

[0023] In the following descriptive report of the attached diagrams, equal reference signs designate equal or comparable components. In addition, summary reference signals are used for components and objects, which often occur in a modality example or diagram, however with respect to one or more features they are described together. The components or objects, which are described with the same or summarized reference signs may, with respect to some, several or all of the characteristics, for example with respect to their dimensions, may be executed in the same way, however, optionally also differently, as long as it does not express or imply anything different from the descriptive report.

[0024] Figure 1 shows a schematic diagram of a sectional view of a seal 11 with an insert 12 according to an exemplary embodiment in a bearing bushing 13. The insert 12 for the seal 11 of a rolling bearing comprises a prestressing frame 19, which is formed to prestress a bearing body 15 of the rolling bearing in the axial direction m. The pretension structure 19 is formed in one piece with the insert 12.

[0025] In this case, the axial direction m is a direction that lies parallel to an axis of rotation of the rolling bearing, in which the seal 11 or the insert 12 is arranged. In certain circumstances, depending on the type of bearing construction or rolling bearing shape, a force which the pretension structure 19 exerts, for that purpose, on the bearing body 15 or whose direction may be arranged parallel to the axial direction or also include an angle between 0° and 15° in the two directions with the axial direction.

[0026] In the example embodiment of Figure 1, the prestress structure 19 is a compressible disk. In some other examples of embodiments not shown, the prestress structure may comprise or be any component, which is formed to prestress the rolling body of the rolling bearing in the axial direction, for example an elastic member of an elastomer, a spring, a coil spring, a torsion spring, a coil spring, a diaphragm spring, a leaf spring, an elastomer spring and/or the like.

[0027] In the example embodiment of Figure 1 the bearing body 15 is a needle roller for a bearing bush 13 in a universal joint. In some other embodiment examples not shown, all other possible bearing bodies can also be used, which allow a movable support of a component in relation to a housing, for example cylindrical rollers, tapered rollers, balls, barrels and/or similar. In conventional universal joint housings, between a main seal or seal and a set of bearing bodies, as already described for Figure 1, compressible discs are most often used to pre-stress the bearing body or axially a needle set used as bearing body. For this purpose, most often a compressible disk is used as a separate component. In the insert 12 of the exemplary embodiment of Figure 1, on the other hand, the function of the compressible disc or prestressing structure 19 is integrated into the insert 12, which can also be referred to as the seal insert 11. In certain circumstances, this may be thus saving component costs and assembly costs, the components themselves and also an operational process in the assembly.

[0028] In this case, in Figure 1, the entire universal joint is not represented, but only an area 14 for a universal joint pin not shown, which is rotatably arranged in the bearing bush 13 and, for this purpose, can be introduced from a first axial end 20 of the bearing bushing 13 into an interior of the bearing bushing 13. Between the area 14 for the pin and the bearing bushing 13, a plurality of cylindrical bearing bodies are arranged alongside the bearing body. bearing that can be recognized in Figure 1, which are spaced apart from each other in the circumferential direction. Bearing bodies 15, under certain circumstances, can be lubricated by a lubricant. The pin and bearing bodies 15 are operated, in each case, axially against a thrust washer not shown at a bottom of the bearing bushing 13, which is located at a second end opposite the first axial end 20 of the bearing bushing. 13. In the area of the first axial end 20 there is between the pin and the bearing bush 13, when the pin is mounted, an annular gap which is closed by the seal 11.

[0029] The seal 11 has an outer seal ring 16 and an inner seal ring 17, which comprises the insert 12. The two seal rings 16 and 17 are axially arranged next to each other. In this case, the outer sealing ring 16 in the area of the first axial end 20 of the bearing sleeve 13 is arranged on the outside of the bearing sleeve 12. The inner sealing ring 17 with the insert 12 and the pretension structure 19, is arranged inside the bearing sleeve 13, directly adjacent to the bearing bodies 15.

[0030] The inner sealing ring 17, in addition to the insert 12 with the prestressing structure 19, which can also be called a support ring, also has a sealing body 18 with a part 18-a located radially on the outside of the insert 12 and a part 18-b located radially inside the insert 12. Thereby, the insert 12 is at least partially arranged inside the sealing body 18. A section of the insert 12, which is arranged inside the sealing body 18 or overlaps with it in the axial direction and thereby touches the sealing body 18, is designated as a stabilizing section 23. This can serve to stabilize the seal 11 or the inner sealing ring 17.

[0031] The sealing body 18 can be produced from viton, another elastomeric material and/or another elastic material. The insert 12 and/or the pretension structure 19 can be produced from all possible materials, for example metal, steel or a spring steel. For example, insert 12 and prestress structure 19 can be produced from the same material. A material of the sealing body 18, in this case, can be distinguished, for example, from the material of the insert 12. The sealing body 18, in the exemplary embodiment of Figure 1, is connected with the insert 12. For this purpose, the insert 12 has openings, not shown, in which the radially outer part 18-b and the radially inner part 18-a meet and are connected to each other. In some other exemplary embodiments not shown, these openings can be dispensed with and/or also the outer radial sealing body can be dispensed with at least partially or even completely. For example, the sealing bodies and the insert can be adhered to each other by positive union and/or friction. The insert can be, for example, a component, which is at least partially snug in the sealing body. Eventually, the insert may have a harder or less elastic material than the sealing body.

[0032] Insert 12 with prestress structure 19 is produced as a stamped part. In some other embodiment examples not shown, the single piece can also be obtained in another way and manner. A two-component one-piece connection, e.g. of the insert and the prestressing structure, can be achieved, in that case, for example, by connecting the two components, e.g., by means of a positive and/or a joint connection. or forced fitting, where appropriate, riveting, soldering, crimping, screwing, closing by means of soldering, gluing and/or the like. Optionally, for this purpose, the two components can also be produced as a single piece, for example as a stamped part, a forged part, a cast part, a die-cut component or the like.

[0033] The insert 12 presents in the cross section a Z shape, with two arms projecting out of the sealing body 18. The arms are respectively adjusted in the axial direction opposite to the stabilization section 23 already described, arranged inside the sealing body 18. One of the arms serves at least partially as a fastening structure 21, moreover, it is staggered. The fastening structure 21 further extends even further in an axial direction than the sealing body 18 to a radial height, at which the fastening structure 21 exits the sealing body 18, to a side away from the structure. prestress 19 in the axial direction. Via the fixing structure 21, the seal 11 can be fixed in the bearing bush 13 or in another housing, for example in an outer ring or in a bore in a housing. To fix the seal 11 or the seal ring 17 in the circumferential direction, the fixing structure can have a diameter on its outer circumference which with an inner surface of the bearing bush 13 results in a forced fit.

[0034] The other arm, which projects out of the sealing body 18 in an axial direction to the bearing body 15, comprises the pre-tension structure 19 already described. The pretension structure 19 is at least partially fitted with a front surface aligned in the axial direction on a front surface of the part 18-a of the sealing body 18, equally aligned in the axial direction. The pretension structure 19 is not fitted to a front surface 24 on the part 18-b of the sealing body 18 aligned in the axial direction.

[0035] The sealing body 18 or part 18-a is spaced from the prestressing structure 19 in an area radially within a diameter m, in which the bearing bodies 15 are arranged with their central points . In some other exemplary embodiments not shown, the pretension structure may also still be radially fitted inside or outside the sealing body.

[0036] The inner sealing ring 17 is therefore arranged at an axial distance to the side of the bearing bodies 15, on an inner circumference of the bearing bush 13 and, in this case, is torsion-proof and sealingly connected with the bearing sleeve 13. On the one hand, this is achieved by the fact that the sealing body 18 of the inner sealing ring 17 is pre-stressed to the bearing sleeve 2. On the other hand, the clamping frame 21 of the insert 12 which projects out of the sealing body 18, as already described, engages in a recess in an inner circumference of the bearing bush 13, namely the axial stop 22. In exemplary embodiments, in which the outer radial part of the sealing body, the clamping frame in relation to the bearing sleeve, can only be established by means of a forced fit. In some other examples of embodiment not shown, this connection can also occur with respect to another housing, in which the pin or another component is rotatably supported.

[0037] The inner sealing ring 17 is secured 21 against axial displacement through the clamping frame. This is particularly necessary due to the effect of the pretension structure 19. The pretension structure 19 presses the bearing bodies 15 axially against an axial washer not shown, which is arranged on a bottom not shown on a side away from the seal 11 of the bearing bushing 13. Since the bearing bodies 15 are tightened in this way, the bearing bushing 13 including the seal 11 and the bearing bodies 15 can be handled as a unit and pushed onto the pin.

[0038] On an inner circumference of the sealing body 18 of the inner sealing ring 17 a sealing lip 27 is formed, which fits the pin in an assembled state. By means of a surrounding coil spring 28, which is also referred to as an endless spring, the sealing lip 27 is pressed against the pin. Next to the sealing lip 27, a sealing lip 29 is formed, which has a very elongated shape and extends in an axial direction direction radially deviates outward to the outer sealing ring 16 and fits its sealing body. In some other embodiment examples not shown, the second lip may also be dispensed with or be otherwise shaped. Optionally, the sealing ring can also have other lips.

[0039] The outer sealing ring 16 is secured in the axial direction in an axial groove 30, which is located on a surface of the bearing bush 13 aligned radially outwards, which can also be another housing or another outer ring. The outer sealing ring 16 likewise has a sealing body 31 and a support ring 32 or an insert. The sealing body 31 of the outer sealing ring 16 is preferably produced from viton or another elastomeric material. The retaining ring 32 of the outer sealing ring 16 is made of metal and has a C-shaped cross section.

[0040] Even when water or other foreign matter penetrates the area sealed by the outer sealing ring 16, these do not reach the interior of the bearing bushing 13, but eventually they can be retained by the inner sealing ring 17, which can also be referred to as a seal for a universal joint sleeve with an integrated compressible disc. In some other exemplary embodiments not shown, the seal may comprise only the inner seal ring. Optionally, this can also be combined with other outer sealing rings that do not, for example, have any inserts or another number of sealing lips.

[0041] The insert and/or seal according to an example of embodiment, can also be used in all types of rolling bearings and not only, as described in the Figures, in bearing bushings for universal joints. For example, the seal and/or insert can be used in all types of bearings, which are used for the rotational support of two components, possibly in vehicles, operating machines, axles, gears, PTO shafts, universal joint bushings. and/or similar. In this case, the bearings can be, for example, ball bearings, tapered roller bearings, needle bearings, cylindrical roller bearings and/or the like in single or multi-row arrangement.

[0042] The examples of modality published in the descriptive report above, in the following claims and in the attached Figures, as well as each of their characteristics both individually, as well as in any combination can be important and implemented for the realization of an example of modality in its different settings.

[0043] LIST OF REFERENCE NUMBERS 1 seal 2 insert 3 bearing bush 4 area for pins 5 bearing body 6 outer seal ring 7 inner seal ring 8 seal body 9 compressible disc 11 seal 12 insert 13 bearing bush 14 area for studs 15 bearing body 16 outer sealing ring 17 inner sealing ring 18 sealing body 19 pretensioning frame 20 axial end 21 fixing frame 22 axial stop 23 stabilizing section 24 front surface 27 sealing lip 28 spiral spring 29 sealing lip 30 radial groove 31 sealing body 32 support ring M axial direction

Claims (6)

1. Seal (11) for a rolling element bearing with the insert (12) characterized in that the insert comprises the following features: a prestressing structure (19), which is formed to prestress a bearing body ( 15) of the rolling bearing in the axial direction; the pretension structure (19) being formed as a single piece with the insert (12); and at least one sealing body (18), which is formed to seal a gap between the housing (13) and a component, which is rotatably supported on the housing (13), in which the seal (11) is at least partially inserted; the insert (12) having at least one section, which projects out of the sealing body (18), which serves as a fastening structure (21); wherein the fixing structure is formed to fix the insert (12) and/or the seal (11) in the housing (13); wherein the insert (12) is at least partially disposed within the seal body (18), wherein the insert (12) is formed at least partially as a stabilizing part (23) to stabilize the seal (11). 2. Seal according to claim 1, characterized in that the insert (12) comprises at least one arm that projects out of the sealing body (18) in axial direction to the bearing body (15), which forms the prestressing structure (19). 3. Seal according to any one of claims 1 to 2, characterized in that the prestressing structure (19) comprises a compressible disc. 4. Seal according to any one of claims 1 to 3, characterized in that a front surface of the pretension structure (19) aligned in an axial direction, fits at least partially on a front surface of the sealing body (8) aligned in an axial direction, which is radially arranged inside the insert (12). 5. Sealing, according to any one of claims 1 to 4, characterized in that the sealing body (18) is connected by positive union with the prestressing structure (19). 6. Universal joint with a bearing bushing (13) and/or bearing bushing (13) with the seal (11), of the type as defined in any one of claims 1 to 5, characterized in that the seal (11 ) is at least partially inserted into the bearing sleeve (13).

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