DE4307830A1 - Rolling bearing between two relatively rotary components - has intermediate layer with sleeve-like section between outer race and bearing seat of the component - Google Patents

Abstract

The sleeve-like section engages over the outer race and is connected to an annular section, which extends on the axial side of the bearing radially towards the inner race. Between the annular section and inner race is a radial, disc-shaped, axially resilient component which can be formed by a plate spring. The plate spring can be supported at its radially outer edge on the radial section of the intermediate layer, and at its radially inner edge on the inner race. Centring can be provided between the plate spring and inner race. ADVANTAGE - Reduced twist between the inner and outer race,maintained in a narrow tolerance range.

Description

The invention relates to a rolling bearing for Example of use on an item after a of patent applications DE 41 22 333 A1 or DE 41 17 579 A1 and at least insofar refers to the whole Content of these registrations, which is also the subject of present application.

DE 34 25 161 A1 are already roller bearings became known with an intermediate layer between the outer Rolling ring and the component carried by it, wherein this liner is formed by two annular elements , each have a radial area, which is extends to the inner rolling bearing ring and for sealing the bearing by means of a plate spring against it axially is tense.

The object of the present invention was to Wälzla wrestled with an intermediate layer between the outer Wälzla gerring and the component to be carried by it especially with regard to their possible uses and Function.  

Furthermore, the roller bearing according to the invention units to be equipped, such as, in particular, torsional vibrations damping devices, with regard to their function and Lifetime can be improved. In addition, the Assembly and handling work for such units be made easier by a pre-assembled unit of bearings and seal and / or thermal insulation is created.

This is achieved according to the present invention by that between the radially outer rolling bearing ring and the Bearing seat of the component to be carried by the outer ring at least one intermediate layer is provided, one has sleeve-shaped section encompassing the outer ring and one connected to it and axially on at least one side of the bearing extends radially towards the inside Has ring-shaped portion extending ring, being between this and the inner bearing ring radial disc-like and axially resilient component is provided. This component can advantageously be formed by a plate spring.

Due to the inventive design of the rolling bearing can be achieved that at a relative rotation of the outer and inner bearing ring existing torsion resistance to the known rolling bearings significantly can be reduced or, provided such a twist resistance is desired, within a narrow tolerance band can be held. This is due to the fact that the  Twist resistance, which is between the radial section the intermediate layer and the inner bearing ring is generated in is essentially dependent on the axial clamped disc-like component, which is advantageous Way can be interpreted in such a way that over a certain axial travel of the component applied by this No axial force or only a relatively small one Shows change. This can result in installation tolerances be largely compensated, so that on the tolerances due to the different installation positions of the individual disc-like components in the individual units none or twist resistance changes with a proportional generate little scatter, which causes the function of the aggrega tes is not affected. This is particularly the case with Torsional vibration dampers with two on the rolling bearing components that can be rotated relative to one another and have little least a spring arrangement generating a torsional resistance are coupled, advantageous.

Torsional vibration dampers are advantageously found in Motor vehicles for coupling the internal combustion engine to the Gear use. In some such cases however, the gear-motor combination so critical that in Idling of the internal combustion engine and with a neutral gear position, a so-called idling rattle in the gearbox occurs that interacts with that between those Gears existing play and those transmitted by the engine Torque or rotational irregularities can be attributed.  

The transfer of these irregularities to the transmission wave of input is in many cases also due to the Rolling bearing generated friction damping or friction hysteresis attributed. Due to the configuration of the Rolling bearings can reduce this friction or hysteresis can be significantly reduced and in many applications gear rattling can be avoided in this way alone.

The advantage of the configuration of a Rolling bearing compared to the configurations according to the DE 34 25 161 A1 is that between the two Rolling ring effective friction damping or friction hyster rese mainly due to the resilient disc-like component is determined and thus by appropriate interpretation of the disc-like component within relatively narrow Limits can be kept. For the roller bearings according to the state of the art is that between the two rolling bearings generated friction hysteresis also depending on the Stiffness or geometry and the coefficient of friction, which as thermal insulation trained sealing caps, which by Disc springs acted on and against the radially inner Bearing ring are pressed. In these known Ausfüh a variety of tolerances, such as for example the sealing cap tolerances, the tolerances of the Belleville washers as well as the tolerances of the Belleville washers supporting other components, so that a relative there is a large spread. Furthermore, the fiction  moderate design the advantage that the rolling bearing surrounding components no special formations for support tion of the radial areas of the intermediate layer require resilient components, such as disc springs, which also makes it easier and cheaper to design device equipped with a roller bearing according to the invention ten units is possible.

Another advantage of the present invention is in that the rolling bearing together with that on the outer Bearing ring pushed on the intermediate layer and the between the latter and the inner bearing ring provided disc term component as a structural unit or rolling bearing for further Assembly can be delivered in an aggregate. That seems benike resilient component is so in the camp or in the Rolling bearing integrated, which in the known execution form a rolling bearing is not the case.

It can be particularly advantageous if the disk-like Component with its radially outer edge area on the supports radial section of the liner and with his radially inner edge area on the inner rolling bearing ring. For however, some applications may also be useful if the axially resilient disc-like component is with radially inner areas on the radial portion of the Liner supports and with radially outer areas on inner bearing ring rests. To function properly to ensure the disc-like component, it is  useful if between this and the inner roller bearing ring centering is provided. The inner Rolling ring radially on at least one axial side have an axial recess open to the outside, the one radial shoulder for centering the disc-like component forms. It can also be advantageous if the disc art ge component is centered by the intermediate layer. Therefor for example the radial section of the liner Have molded centering. Such centering can be formed, for example, by axial formations, which are at least partially axially in the between the outer and inner bearing ring free space extend. Another way of doing that is disk-like Keeping the component centered can consist of the radial section of the intermediate layer with an axial shoulder or form recess, the radially outside a center tion for the disc-like component.

It can be particularly advantageous for the function of the intermediate layer be liable if the radial section of the inner Wälzla gerring overlaps at least partially radially. The radial section and the disk-like component in such a way be coordinated that the latter at least approximately radially completely through the radial section of the Liner is overlapped. Such a configuration also has the advantage that the disc-like component the radial section is protected against mechanical influences is so that this is made of a very thin material  can be, which also the friction hysteresis between the Bearing rings can be reduced to a minimum.

The disk-like component can also be centered via the outer rolling bearing ring. It can seem like that benike component radially outwardly extending areas, such as for example, have booms that are located on the on the Radial side provided inner surface radially can support.

The disc-like component can also rotate with the Be a liner. For this, a positive connection between the radial section of the intermediate layer and the disc-like Component be present.

A particularly advantageous embodiment of a roller bearing can be ensured that one by two in Cross-section L-shaped rings formed intermediate layer used with the L-shaped rings on one side axially applied or pushed on the outer rolling bearing ring are. It can be particularly advantageous if between the inner bearing ring and the radial sections of both L-shaped rings an axially spring-loaded disc arena term component is provided.

The inventive design of the rolling bearing has the Advantage that the intermediate layer and the disc-like component Can form sealants for rolling bearings. Farther  can use the liner as thermal insulation for that Rolling bearings are used, which is particularly important when using Bearing lubricated with grease is particularly advantageous.

To ensure that the rolling bearing is sealed properly , it can still be an advantage if between the L-shaped rings in cross-section and the outer Wälzla gerring an elastically deformable sealing ring is provided is.

The invention further includes a rolling bearing unit Rolling elements between an outer and an inner bearing ring, the outer bearing ring two in cross section L- shaped sealing rings, the radially outer sleeve-shaped Areas are axially directed towards each other and the outer Reach around the bearing ring, and the radial sections thereof to extend inner bearing ring and on both sides of the inner Bearing ring each an axially resilient disc-like Component is provided on the one hand on the inner bearing ring axially supported and on the other hand by the neighboring one radial section is axially clamped. The radial one At the same time, the section secures the resilient disc arm term component in the axial and / or radial direction opposite the rolling bearing.

Referring to Figs. 1 to 5, the invention is closer tert erläu.

It shows:

Fig. 1 shows a torque-transmitting device in section, with a rolling bearing according to the invention,

Fig. 2 shows the detail II of FIG. 1 on an enlarged scale,

Fig. 3 shows the delivery state of the rolling bearing for an application according to FIG. 1 on an enlarged scale, the

FIGS. 4 and 5 further variants of inventive rolling bearings.

The device 1 for compensating rotary shocks has a flywheel 2 , which is divided into two flywheels 3 and 4 . The flywheel 3 is, for example, attachable to the crankshaft of an internal combustion engine, not shown, by means of fastening screws. A friction clutch can be attached to the flywheel 4 by means not shown. By actuating this friction clutch, the flywheel mass 4 and thus also the flywheel 2 can be coupled in and out of a transmission input shaft. Damping means in the form of two damping devices 5 , 6 are provided between the flywheel mass 3 and the flywheel mass 4 , which are connected in series and enable a relative rotation between the two flywheel masses 3 and 4 .

As can be seen in particular from FIG. 2, the two flywheels 3 and 4 are rotatably mounted relative to one another via a bearing 7 . The bearing 7 comprises a roller bearing in the form of a single-row ball bearing 8 . The outer bearing ring 9 of the roller bearing 8 is arranged in a bore 10 of the flywheel 4 and the inner bearing ring 11 of the roller bearing 8 is arranged on a central, axially extending and protruding into the bore 10 cylindrical pin 12 of the flywheel 3 .

The inner bearing ring 11 is received with a press fit on the radial shoulder 13 of the pin 12 and axially clamped axially between the radial shoulder 14 of the pin 12 or the flywheel 3 and a locking washer 15 which is fastened on the end face of the pin 12 .

Between the outer bearing ring 9 and the inertial mass 4, a thermal insulation 16 is provided, the heat flow from the cooperating with a clutch disk friction surface 4 of the interrupts a flywheel 4 to the bearing 7 or at least reduced. This prevents thermal overloading of the grease filling of the bearing and excessive thermal distortion or inadmissible expansion of the bearing, which can result in the balls jamming between the bearing rings 9 and 11 . To accommodate the insulation 16 , the bore 10 of the flywheel 4 has a larger diameter than the outer diameter of the outer bearing ring 9 , as a result of which a radial space is formed.

The insulation 16 is formed by two rings 17 , 18 with an L-shaped cross section, which are each applied to the outer bearing ring 9 from one side. The axially facing legs 19 , 20 of the insulation rings 17 , 18 overlap or encompass the outer bearing ring 9 . The radially inwardly facing legs 21 , 22 in the example shown extend partially radially over the inner bearing ring 11 .

Disc-like components in the form of disc springs 23 , 24 are axially clamped axially between the radial regions 21 , 22 of the rings 17 , 18 and the inner roller bearing ring 11 . The plate springs 23 , 24 are supported with their radially inner edge regions on the inner bearing ring 11 and with their radially outer edge regions on the radial legs 21 , 22 . The plate springs 23 , 24 form a seal for the roller bearing 8 in connection with the radial legs 21 , 22 or in connection with the rings 17 , 18 . In order to avoid that bearing grease is pressed out or can crawl out between the rings 17 , 18 and the bearing ring 9 , the outer bearing ring 9 has radially outer projections in the form of bevels or chamfers 25 , which in connection with the L-shaped rings 17th , 18 form free spaces for receiving seals in the form of O-rings 26 , 27 . When the bearing is assembled, the O-rings 26 , 27 are elastically deformed between the L-shaped rings 17 , 18 and the outer bearing ring 9 .

The sealing springs 23 , 24 are secured or centered in the radial direction by the radial legs 21 , 22 of the rings 17 , 18 . For this purpose, the radial legs 21 , 22 form radially within the outer bearing ring 9 each have an axial shoulder 28 which forms a radial shoulder 29 on which the corresponding plate spring 23 , 24 can be supported radially. Due to the axial shoulders 28 , the Tellerfe 23 , 24 radially overlapping areas 21 a, 22 a of the radial legs 21 , 22 are axially offset in the direction of the roller bearing 8 relative to the areas of these legs 21 , 22 supported on the outer bearing ring 9 , whereby between the bearing 8 and the legs 21 , 22 an additional Liche space for receiving the plate springs 23 , 24 is formed. In the illustrated embodiment, the two rings 17 , 18 have additional, the assembly of the rolling bearing-facilitating centering means in the form of axial projections 30 , which are evenly distributed over the circumference and at least partially axially into the free space existing between the outer and inner rolling bearing ring stretch.

To assemble the device 1 , it is advantageous if the roller bearing 8, the two rings 17 , 18 , the plate springs 23 , 24 and the sealing rings 26 , 27 are delivered as a structural unit according to FIG. 3. It is advantageous if there is at least a small interference fit between the outer bearing ring 9 and the sleeve-shaped regions 19 , 20, as a result of which the rings 17 , 18 have an axially non-positive locking relative to the roller bearing 8 . As a result, after the pressing or sliding of the two rings 17 , 18 on the roller bearing 8 , the sealing rings 26 , 27 and the device springs 23 , 24 are secured against the roller bearing 8 or held in a desired position. The rolling bearing unit according to Fig. 3 is pressed into the bore or recess 10 of the flywheel 4, the bearing 8 and the rings 17, 18 are opposite to the flywheel 4 is axially secured by axially between a shoulder 31 of the flywheel 4 and the Flywheel 4 connected disc 32 are clamped.

The two damping devices 5 , 6 have coil springs 33 , 34 which are coupled in series via a flange 35 . The flange 35 thus forms the output part of the damping device 5 and the input part of the damping device 6 . The input part of the damping device 5 is formed directly by the primary flywheel mass 3 . The output part of the damping device 6 is formed by two disks 32 , 36 provided on both sides of the flange 35 , which are connected radially within the flange 35 via rivets 37 to the secondary flywheel 4 .

In the roller bearing shown only in half in FIG. 4, between the radial leg 121 of the sealing cap 119 and the inner bearing ring 111 a plate-spring-like component 123 is axially clamped, which has radially outer cantilever 123 a. The plate spring-like component 123 is supported axially with radially inner regions on the leg 121 and with radially further regions on the bearing ring 111 . For centering or radial positioning of the plate-like spring-like component 123 relative to the roller bearing 108 , its radial arm 123 a extends up to close to the inner lateral surface 109 a of the outer bearing ring 109 . By supporting the arms or boom 123 a on the inner lateral surface 109 a, the plate spring-like component 123 is positioned radially.

In the embodiment of a roller bearing according to FIG. 5, the inner bearing ring 211 preferably has an axial recess 228 which is open radially outwards at both axial ends and forms a radial shoulder 229 for centering the sealing plate spring 223 . The radial leg 221 of the sealing or insulating cap 219 is flat. The axial recess 228 forms a free space in the area of the bearing 208 for receiving the plate spring 223 .

The caps or rings 17 , 18 , 118 , 218 received on a roller bearing 8 , 108 , 208 are preferably designed such that their radial regions 21 , 22 , 121 , 221 are not or only insignificantly by the plate springs or disk-like components 23 , 24 , 123 , 223 are axially deformed or bent.

The caps 17 , 18 , 118 , 218 are preferably made of a thermally insulating and heat-resistant plastic with a relatively high hardness. It is advantageous if a thermoplastic or thermoset is used to produce such caps. Polyether ether ketone (PEEK) or a plastic with similar properties is particularly suitable.

The invention is not illustrated and described on the NEN embodiments limited, but also includes Variants, in particular by combining individual, in connection with the different embodiments described features or elements are formed can. Furthermore, individual features or functions have an invention of their own accord represent.

Claims (18)

1. roller bearing, for example for an application to an object according to one of the patent applications DE 41 22 333 A1 or DE 41 17 579 A1, characterized in that an intermediate layer is provided between the roller bearing outer ring and the bearing seat of the component carried by the outer ring, which has at least one sleeve-shaped section encompassing the outer ring, and has an annular section connected to it and extending radially towards the inner bearing ring on an axial side of the bearing, and a radial disk-like and axially resilient component is provided between the annular section and the inner roller bearing ring is. 2. Rolling bearing according to claim 1, characterized in that the disc-like component by a disc spring is formed. 3. Rolling bearing according to claim 1 or 2, characterized net that the disc-like component with his radially outer edge region on the radial section of the  Liner supports and with its radially inner Edge area on the inner rolling bearing ring. 4. Rolling bearing according to claim 1 to 3, characterized net that between the disc-like component and the A centering is provided inner roller bearing ring. 5. Rolling bearing according to claim 4, characterized in that the inner rolling bearing ring on at least one axial Side an axially open radially outward Has a recess that forms a radial shoulder to the Centering the disc-like component. 6. Rolling bearing according to one of claims 1 to 5, characterized characterized in that the disc-like component by the Liner is centered. 7. Rolling bearing according to claim 6, characterized in that the radial section of the centering liner has for the disc-like component. 8. Rolling bearing according to claim 7, characterized in that the centering means are formed by axial formations are at least partially axially between the extend outer and inner bearing ring. 9. Rolling bearing according to one of claims 6 to 8, characterized characterized in that the radial section has an axial  Heel has a centering for the radially outside disc-like component forms. 10. Rolling bearing according to one of claims 1 to 9, characterized characterized in that the radial section of the intermediate the inner rolling bearing ring was at least partially radial spreads. 11. Rolling bearing according to one of claims 1 to 10, characterized characterized in that the radial section of the intermediate the disc-like component was at least approximately radially completely overlaps. 12. Rolling bearing according to one of claims 1 to 11, characterized characterized in that the disc-like component has a smaller outside diameter than the inside diameter water of the outer bearing ring. 13. Rolling bearing according to one of claims 1 to 12, characterized characterized in that the intermediate layer by two in Cross-section L-shaped rings are formed, each applied from one side to the outer rolling bearing ring are. 14. Rolling bearing according to claim 13, characterized in that between the inner rolling bearing ring and the radial Sections of both L-shaped rings are axially resilient braced disc-like component is provided.   15. Rolling bearing according to one of claims 1 to 14, characterized characterized in that the disc-like component by the radial section of an intermediate layer in an axial resiliently tensioned position is held. 16. Rolling bearing according to one of claims 1 to 15, characterized characterized that the liner and slice ar component to form a sealant for the rolling bearing. 17. Rolling bearing according to one of claims 14 to 16, characterized characterized in that between the L- in cross section shaped rings and the outer bearing ring at least an elastically deformable sealing ring is provided. 18. Rolling bearing unit with an outer and an inner Bearing ring with rolling elements provided between, the outer bearing ring two L-shaped in cross section Seals, the radially outer sleeve-shaped Areas are directed axially towards each other and the embrace the outer bearing ring and its radial sections extend to the inner bearing ring and on both sides of the inner bearing ring each axially resilient disk-like component is provided, the one hand on inner bearing ring axially supported and on the other hand axially braced by the adjacent radial section is cash.