DE202013101844U1 - Backlash-free hybrid elastomer coupling - Google Patents

Abstract

Backlash-free hybrid elastomer coupling, comprising at least two arranged on a common axis coupling hubs (1, 2) each having a contact surface arranged end side (10) and projecting from this in the axial direction driving claws (5, 6), both hubs at least partially with a thermo - or thermosetting coating (3) are provided, characterized in that the hubs via an elastomer (4) are material and positively connected to each other.

Description

The invention relates to a play-free hybrid elastomer coupling and a backlash-free hybrid elastomer coupling, obtainable by a combined die-casting and injection molding.

From the state of the art shaft couplings are known for a long time, with which two rotating shafts are interconnected. Such couplings, with which torques and rotational movements are transmitted, are designed to be torsionally rigid or torsionally elastic, depending on the field of application, and detachable or non-detachable during operation.

A subset of these shaft couplings is formed by the dog clutches. In these grip two each connected to a shaft coupling hubs with projecting in the axial direction Mitnahmeklauen so one another, that rotational movements can be transmitted by the positive connection of the claws. Jaw clutches may be switchable or non-switchable, with the circuitry i.d.R. is realized by axial separation of the involved waves.

There are already known claw couplings, which are at least partially formed from plastics. So revealed the DE 10 2005 055 771 A1 a coupling hub made of thermoplastic material with an inner circular axle and a spaced circular outer ring, are arranged on the driving claws. The axle and the outer ring are connected to each other only via rigid connecting webs. Due to the structure like a structure, such a coupling advantageously has a low weight; However, only comparatively small forces can be transmitted via the webs.

Due to the filigree structure of such coupling body continue to be costly in manufacturing, which is preferably carried out by injection molding. So revealed the DE 10 2006 049 486 A1 a method for producing a hollow cylindrical clutch hub described above from thermoplastics, which is to be achieved by a particular embodiment of the injection molding machine and by the arrangement of the spray nozzles increased strength of the hub.

A coupling in composite construction is in the DE 20 2007 014 532 U1 described. This has a coupling part in the form of a metallic disk body, to which a plastic hub is attached by injection molding. For this purpose, contact surfaces are provided on the disk body, which faces away from the axis of rotation of the clutch. An implementation of this construction on jaw clutches is not readily possible.

Elastomeric couplings form a subset of such dog clutch, in which the positive engagement does not occur directly between the teeth of the clutch hubs involved. Rather, a connecting element in the form of an elastomeric ring is inserted between the coupling hubs. This elastomeric ring has teeth that fit between the claws of the clutch hubs. Thus follow on the claw of a first clutch initially always a tooth of the elastomeric ring and only then a claw of a second clutch hub. Due to the damping properties of the elastomeric material so advantageous vibrations of vibrating drive components can be compensated. Due to the elasticity of the elastomer such a coupling is still able to compensate for a small offset aligned or slightly angled standing waves in both the axial and in the radial direction.

Both backlash-free and backlash-type elastomer couplings are available on the market, with predominantly play-free elastomer couplings being used in drive technology. The backlash is generated so far by an excess of the elastomeric body to the clutch hubs. Consequently, in these couplings, adhesion between the elastomeric body and the clutch hubs prevails. A method for forming such a conditionally backlash-free, elastic jaw clutch is in the DE 196 00 511 A1 described. Thus, a molded part is press-fitted between the mating claws of two congruent clutch hubs, heated to a limit temperature between the clutch hubs, and held at this threshold temperature for a time. The disadvantage here must be measured with great precision in the available space between the clutch hubs, wherein any deformations due to pressing or heating must be taken into account.

However, there is also a disadvantage after the press-fitting of the intermediate ring a clearance between the elastomer and the metallic hub bodies. This leads, together with the material properties of the intermediate ring, to a lower load capacity of the elastomeric material in comparison to the most metallic executed hub bodies.

The DE 28 18 117 A1 Therefore, describes an elastic coupling, which should be able to be loaded even at high speeds with in relation to their volume high torque. For this purpose, it has three or more associated with a first coupling part arms, arranged between the arms abutment and a polygonal ring of elastomeric bodies. The existing of few components clutch is still very complicated, resulting in a costly production and a complex assembly leads. Furthermore, in the clutch, the entire torque is transmitted via the abutment made of a metal strip, the strength of these metal strips is a weak point and it is questionable to what extent the torque resistance of the clutch is actually given.

Another problem with known elastomeric couplings is the far greater wear of the elastomeric connector compared to the metallic hub bodies. This results in a low long-term stability and autonomy of the entire hub, since regularly the elastomer inserts must be changed.

To make the intermediate element more resilient and lower the cost of wear elements, proposes the DE 298 06 632 U1 a formed from individual teeth intermediate or elastomeric element, wherein the teeth for insertion into the spaces between the driving claws to assembly units are joined together. Furthermore, the formation of teeth made of different materials should allow adaptation to different requirements. In this case, the retaining ring for the teeth and the individual teeth themselves may consist of different materials or the teeth in composite construction, for example. Of materials of different hardness or with metal reinforcements, be constructed. When operating the clutch, the absence of a fixation of the teeth leads to an increased mobility of the teeth relative to the coupling claws and thus to increased wear.

Composite solutions already exist in the field of elastomer couplings. That's how it describes DE 10 2010 027 841 A1 a clutch hub for a dog clutch, wherein the coupling claws are at least partially coated with a plastic jacket. This coating contributes in particular to an increased dimensional stability of the coupling after the manufacturing process. Furthermore, the moment of inertia of the clutch can be reduced by the design of the rotating parts in lightweight construction. The order of the plastic on the clutch hubs, which are preferably produced by die-casting, preferably takes place in an injection molding process in which the metallic clutch hubs are used as an insert for an injection molding of a plastic injection molding machine.

An injection molding process for producing such plastic-coated composite components is described in WO 2009/083196 A1 described. Accordingly, the production of such a composite component by a first precursor is poured through a first casting process in a first casting machine and then removed. Brought to a certain temperature, this precursor is then placed in a second casting machine and a second casting process to form a metal / plastic / hybrid part performed. The first casting machine is a metal casting machine and the second is a plastic casting machine. Advantageously, in this process, the residual heat of the first casting process can be utilized and thus the time required for the production can be reduced.

In summary, the advantages of the previously available elastomer clutches, for example the conditionally backlash-free and torsionally flexible torque transmission, the shock absorption and the offset compensation, are compensated for by a number of disadvantages. In particular, the oversize and the high wear of the elastomer body required for the accuracy of fit represent problems. Due to the difficult assembly and the limited service life of the elastomer elements, economic utilization of known elastomer couplings has hitherto only been possible to a limited extent.

The aim of the invention is therefore to overcome the disadvantages of the prior art and to present a hybrid elastomer coupling with the increased benefits of backlash elastomeric couplings, in particular with freedom from rotation, torsional elasticity, damping and offset compensation, which at the same time a reduced wear of the elastomeric elements and high ease of assembly having. In addition to the increased efficiency due to the longevity of the clutch, this should also be easy and inexpensive to manufacture.

This object is achieved by a backlash-free hybrid elastomer coupling according to the main claim and by a backlash-free hybrid elastomer coupling according to claim 8 obtainable by a combined die-casting and injection molding.

For the purposes of this document, an elastomer coupling is a dog clutch, in which a positive connection does not occur between the claws of the clutch hubs themselves but is conveyed via an elastomer.

A dog clutch in the sense of this document has two longitudinally extended coupling hubs which preferably have masses distributed symmetrically with respect to the longitudinal axis and particularly preferably rotationally symmetrically distributed masses. Particularly preferably, the clutch hubs are constructed at least partially rotationally symmetrical.

The coupling hubs each have a first part with an end-side centric shaft receptacle. The first part of the clutch hub can be completely hollow cylindrical be formed or have a central bore with a depth smaller than the longitudinal extent of the first part. If the first part of the coupling is not rotationally symmetrical, the circumference of the first part is determined by its greatest radial extent.

The coupling hubs have at the opposite end of the shaft receiving a second part. This part is formed by a footprint and projecting from this footprint in the axial direction driving claws. The footprint is preferably formed as a circular ring or disc, but there are also other forms, in particular with respect. The circumference of the footprint, conceivable. The radial extent of the footprint may be equal to or greater than the radial extent of the first part. If the footprint is formed as a circular ring, the driving claws are fastened exclusively on this circular ring, but can protrude beyond it in the radial direction.

The driving claws of the individual clutch hubs fill the respective footprint only partially. In this case, interruptions are provided in the circumferential direction of the footprint, in which no driving claws are arranged. These interruptions are thus open to the engagement of the driving claws of the second clutch hub. Due to the driving claws of both hubs, a positive connection can thus be made in the direction of rotation of the clutch. Since it is an elastomeric coupling according to the invention, it should be noted that the intermeshing driving claws of two assembled coupling hubs do not complement one another to form a closed circular ring, but that the positive locking of the claws is only mediated via an additional elastomer element.

The backlash-free hybrid elastomer coupling according to the invention has at least two arranged on a common axis clutch hubs each having a contact surface arranged end side and projecting from this footprint in the axial direction Mitnahmeklauen, both hubs, in particular their contact surfaces and the driving claws, at least partially with a thermo or thermosetting coating are provided. According to the invention, the two coupling hubs are further connected to one another via an elastomer material and form-fitting manner. The connection via the elastomer is preferably carried out in the area of the footprints and the driving claws.

Advantageously, by the connection of the hubs an elastomer game in the connection of the two hubs advantageously both in new and in use completely prevented. The play of the clutch hubs is recognizable in the torque / rotation angle diagram by a section parallel to the abscissa of both cam branches. The backlash remains beneficial over the life of the clutch continue as long as the cohesive connection between the hub bodies is given.

Also advantageous is the material and form-locking connection of the hubs, the radial offset to each other advantageously reduced to less than 0.25 mm, preferably less than 0.2 mm and more preferably less than 0.15 mm. The axial offset of the hubs from one another is advantageously reduced by the compound according to the invention to less than 2 mm, preferably less than 1.5 mm and particularly preferably less than 1 mm. The angular offset of the hubs from one another is advantageously reduced by the compound according to the invention to below 2 °, preferably below 1.5 ° and particularly preferably below 1 °.

The driving claws of the clutch hubs preferably engage with each other without touching each other, with successive driving claws alternately belonging to one of the two clutch hubs in the circumferential direction. Preferably, the driving claws consecutive in the circumferential direction have spacings between one another which are filled with the elastomer. Preferably, the distances between the circumferentially consecutive driving claws are equidistant.

Preferably, the elastomer is at least partially cohesively connected to the thermosetting or thermosetting coating of both coupling hubs. The cohesive connection of the hubs with each other is thus mediated via the respective cohesive connection of the hub body for thermosetting or thermosetting coating as well as the respective cohesive connection of this coating to the elastomer. Advantageously, the coating acts as a bonding agent for the elastomer located between the hubs and thus contributes to the strength of the connection between the hubs. Thus, with the hub and high torques are also advantageous transferable.

Preferably, the volume between the clutch hubs, which is limited by the circumference of the contact surface and which remains between the driving claws overlapping in the axial direction, is completely filled by the elastomer. In the case of a continuous hollow cylindrical hub, this volume is thus limited on the one hand by the plane-parallel end faces of the clutch hubs facing each other and on the other by the outer periphery of the contact surfaces forming circular rings. The inner opening of the circular rings does not matter with regard to the volume filled by the elastomer. This rather has the shape of itself between the end faces located circular cylinder, minus the volume of the driving claws located between the faces.

Furthermore, preferably, the coupling hubs have a cohesive connection mediated by the elastomer even beyond the contact surfaces and the driving claws. The coating with the thermoplastic or thermosetting plastic also goes beyond the area of the contact areas and the driving claws. Thus, the contact surfaces between the hub bodies and the coating and also preferably the contact surfaces between the coating and the elastomer are advantageously increased. This advantageously ensures a further improved power transmission between the hub bodies.

Also preferably, the intended for the connection between hub bodies and coating and between coatings and elastomer contact points advantageous for the strength of the compound design. Thus, for example, circumference-arranged undercuts can be provided on the hub bodies, which are later filled with the elastomer and thus contribute to the tensile strength of the coupling according to the invention.

For the sake of weight reduction, the hub bodies of the coupling according to the invention are preferably formed from a non-ferrous metal or from an alloy of a non-ferrous metal. Particularly preferably, the hub bodies are formed from aluminum or zinc or a zinc alloy. The choice of these materials contributes to a weight reduction over known elastomer couplings, which are primarily made of steel. Furthermore, non-ferrous metals, such as zinc, aluminum or magnesium, or alloys of these metals are particularly suitable for die casting and allow in this way, the production of complex component geometries.

PET, PBT or PA are preferably used for the thermosetting or thermosetting coating of the hub body, but other plastics can also be used. Thermoplastic coated hybrid hubs for jaw clutches developed by the present inventors and known in the art DE 10 2010 027 841 A1 The contents of which are hereby incorporated by reference in their entirety. The plastics used for the thermosetting or thermosetting coating can also be reinforced with short fibers, for example glass fibers, aramid or carbon fibers. The size of the short fibers added to the plastics are generally set by the machine tools used in the die casting process limits.

The elastomer is preferably a thermoplastic elastomer selected from TPO, TPV, TPU, TPC, TPS and TPA. This elastomer has a dual function in the hybrid elastomer coupling according to the invention. On the one hand, it serves for the cohesive connection of the coupling hubs, whereby in particular the quality of the cohesive connection of the elastomer with the coated surface of the hub arrives. By a resistant, tear-resistant connection while a clearance between the hub bodies and the elastomer is advantageously avoided and thus reduces the wear of the elastomer compared to known elastomer clutches drastically.

The thermoplastic or thermosetting coating material acts in the coupling according to the invention advantageously in the manner of an adhesion promoter. By the coating of the clutch hubs and their subsequent cohesive connection by means of the elastomer thus contributes, in particular the cohesive connection of the thermoset or thermoset with the elastomer to strength of the compound.

Particularly preferably, PET is used as the coating material and TPC as the elastomeric material for the cohesive connection of the hubs, since with this combination of materials a very strong positive connection between the hubs is advantageously achieved. Further particularly preferred are the combinations of PBT and TPC, PET and TPE as well as PBT and TPE, which lead to equally strong form-fitting connections between the hubs.

A detached elastomer component, as is always the case in known elastomer couplings, is subject to severe wear. Such a loose part also generates high pressure forces in the clutch and thereby heavily loaded the clutch hubs. In the backlash-free hybrid elastomer coupling such stresses are avoided by the material and positive connection of elastomer and thermoplastic advantageous. Thus, advantageously, the life of the coupling according to the invention is increased and at the same time guarantees a long-term stable backlash.

The inventive backlash-free hybrid elastomer coupling has due to the cohesive connection by the elastomer, which has a high peel strength due to serving as a bonding agent plastic coating, advantageously a high torsional stiffness, low weight, one, at least approximately, complete backlash and a much longer life.

In a preferred embodiment, the backlash-free hybrid elastomer coupling according to the invention is in one-piece form and is composed of two built one-piece clutch hubs, which are connected to each other via an elastomer. This one-piece backlash-free hybrid elastomer coupling furthermore preferably has means for the rotationally fixed fixing of the drive and output shafts. For this purpose, both coupling hubs on or in the central shaft receiving means arranged for the positive rotationally fixed fixation, such as. Keyway grooves, on. Furthermore, the hubs preferably also have means for the positive, axial fixation of the shafts in the shaft receptacle. The one-piece design of the hub according to the invention further allows a weight reduction compared to conventional elastomer couplings with steel hubs.

In a likewise preferred embodiment, the coupling according to the invention is in the form of a dismounting coupling and has a multi-part design, the two cohesively interconnected coupling hubs each having a multi-part design. The hubs have means for non-positive fixing of the drive or output shaft in the central shaft mount. These means are particularly preferably designed as clamping shells, which allow both a rotationally fixed and an axial fixation of the shaft. The multi-part design of the hub according to the invention with additional clamping half-shells allows a weight reduction compared to conventional steel hubs. Since for steel couplings, due to the strong stresses on the shaft receiving, so far the preferred material is steel, the hub according to the invention enables a significant weight reduction, especially in this embodiment.

• – Druckguss zweier längserstreckter Nabenkörper, einseitig mit Aufstandsfläche und in axialer Richtung abstehenden Mitnahmeklauen, aus einem Nichtmetall oder einer Nichtmetalllegierung in einem Druckgusswerkzeug,
• – Entnahme der Nabenkörper, jeweils Einlage in ein erstes Spritzgießwerkzeug und Anspritzen einer thermo- oder duroplastischen Beschichtung,
• – Entnahme der beschichteten Nabenkörper und gemeinsame Einlage in ein zweites Spritzgießwerkzeug, wobei die Mitnahmeklauen beider Naben berührungslos ineinander eingreifen und in axialer Richtung überlappen und
• – Einspritzen eines Elastomers in die zwischen den Nabenkörpern befindliche Kavität.

The invention further provides a backlash-free hybrid elastomer coupling, obtainable by a method, comprising the steps:

• Die-casting of two elongated hub bodies, one-sided with contact patch and axially projecting driving claws, of a non-metal or a non-metal alloy in a die-casting tool,
• Removal of the hub body, in each case insertion into a first injection mold and injection molding of a thermosetting or thermosetting coating,
• - Removal of the coated hub body and common insert in a second injection mold, wherein the driving claws of both hubs contact each other without contact and overlap in the axial direction and
• - Injecting an elastomer into the cavity located between the hub bodies.

The process necessary for the production of the backlash-free hybrid elastomer coupling according to the invention, up to and including the coating of the individual hub bodies with a thermosetting or thermosetting coating, largely corresponds to that in US Pat WO 2009/083196 A1 described method. However, the preparation of the coupling according to the invention makes it further necessary, two each coated hub body, taken in each case a final product of in the WO 2009/083196 A1 represent described method to insert in a second injection mold.

The insert into the second closed injection mold takes place in such a way that the driving claws of the coupling hubs mesh so that successive claws in the circumferential direction belong alternately to one of the two hubs, do not touch, preferably have equidistant distances and overlap in the axial direction. If the hub bodies are fixed in the second injection mold in such a way, this is closed and an elastomer is injected into the cavity located between the hub bodies.

In a preferred embodiment, this cavity corresponds to the volume remaining between the clutch hubs and being limited by the circumference of the contact surfaces and remaining between the driving claws overlapping in the axial direction. The easiest way to realize the injection of the elastomer, if the contact surfaces closed, for example. As closed circular discs, are configured. Then, the volume located in the axial direction between the circular disks must be limited only along the circumference of the contact surfaces, along its axial extent through the second injection mold. If the contact surfaces are not closed, that is to say, for example, as an open circular ring, a more complicated design of the second injection mold or the insertion of additional cover plates into the injection mold is necessary to produce closed contact surfaces.

Preferably, the heat produced in the pressure casting step and in the first injection molding step is used in the subsequent process step. In both injection molding steps, both the components inserted in the closed injection molding tools and the tools themselves must have a certain temperature in order to ensure the flowability of the plastics. Thus, by utilizing the residual heat in the second injection molding step, the overall energy cost of the process is reduced and freezing is prevented.

Further preferably, the temperature of the injection molds is advantageously ensured by the utilization of the residual heat of the respective preceding process step and / or actively regulated. Thus, the production of the hybrid coupling according to the invention is also advantageous in a fully automated operation and / or in a closed manufacturing cell easily and economically possible.

Hereinafter, the invention will be explained with reference to figures and an embodiment, without being limited thereto. Showing:

1 : A one-piece backlash-free hybrid elastomer coupling in a perspective view and in a perspective sectional view;

2 : A multi-part backlash-free hybrid elastomer coupling as an expansion coupling in a perspective view and in a perspective sectional view;

3 : The torque-torque curve of a standard elastomer coupling in new and used condition;

4 : The torque-rotational angle characteristic of a hybrid clutch according to the invention in new and used condition.

In 1 and 2 two play-free hybrid elastomer couplings according to the invention are shown. These are each made of two clutch hubs made of zinc 1 . 2 formed and each have a first part with a central shaft recording 7 and a second part with a footprint 10 and takeaway claws 5 . 6 on. The footprints 10 and takeaway claws 5 . 6 the hubs 1 . 2 each with a coating 3 made of thermosetting or thermosetting material. To the coating 3 closes an elastomer 4 on that the two coated hub bodies 1 . 2 cohesively connects with each other.

In the 1 The coupling shown is a one-piece coupling consisting of two via an elastomer 4 cohesively interconnected one-piece hub 1 . 2 , The hubs are made of zinc. The one in the area of the footprint 10 and takeaway claws 5 . 6 thermoplastic applied to the hubs 3 ,

In the 2 The coupling shown is a multi-part expansion coupling, consisting of two two-piece hubs 1 . 2 that have an elastomer 4 are cohesively connected to each other. The hubs each have a clamp for fixing a shaft inserted into the centric shaft receptacle 8th . 9 on, each by means of four screws on the hub bodies 1 . 2 be attached. In the area of the footprint 10 and takeaway claws 5 . 6 is a thermoplastic 3 applied to the hub.

In 3 are the torque-torque curve characteristics of a standard elastomer coupling in new condition and in the used state after 11.5 million load changes shown.

The order of torque and angle of rotation in the form of hysteresis curves allows the determination of the play of the clutches. Their game is characterized by the deviation of the two paths of the hysteresis curves at zero crossing, where there is play when the curves in the direction reversal parallel to the Verdrehwinkelachse. At the same time, the hardness of the clutches can be read from the rise of the curves, with flat curves characterizing soft clutches and steep curves hard clutches.

How out 3 readable, the standard elastomer coupling is no play in the new or used condition.

The 4 shows the torque-rotational angle characteristics of a hybrid elastomer clutch according to the invention in new and used condition after a 11.5 million load changes shown. The hybrid elastomer coupling according to the invention was subjected to the same test block as the standard elastomer coupling in 3 , After the 11.5 million load changes, the curve for the hybrid elastomer clutch according to the invention is significantly flatter and the clutch thus significantly softer than at the beginning of the test block; their freedom of play, however, remains over the entire load changes.

LIST OF REFERENCE NUMBERS

1

clutch

2

clutch

3

Thermoplastic coating

4

elastomer

5

driving claw

6

driving claw

7

centric shaft recording

8th

clamp

9

clamp

10

footprint

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102005055771 A1 [0004]
• DE 102006049486 A1 [0005]
• DE 202007014532 U1 [0006]
• DE 19600511 A1 [0008]
• DE 2818117 A1 [0010]
• DE 29806632 U1 [0012]
• DE 102010027841 A1 [0013, 0032]
• WO 2009/083196 A1 [0014, 0041, 0041]

Claims (9)

Backlash-free hybrid elastomer coupling, comprising at least two coupling hubs arranged on a common axis ( 1 . 2 ) each having a contact surface arranged at the end ( 10 ) and from this axially projecting driving claws ( 5 . 6 ), both hubs being at least partially covered by a thermosetting or thermosetting coating ( 3 ), characterized in that the hubs are provided with an elastomer ( 4 ) are materially and positively connected with each other. Backlash-free hybrid elastomer coupling according to claim 1, characterized in that the elastomer ( 4 ) at least with the thermosetting or thermosetting coating ( 3 ) of both clutch hubs ( 1 . 2 ) is material and positively connected. Backlash-free hybrid elastomer coupling according to claim 1 or 2, characterized in that the elastomer ( 4 ) between the clutch hubs ( 1 . 2 ), by the extent of the footprints ( 10 ) limited and between the axially overlapping driving claws ( 5 . 6 ) completely fills the remaining volume. Backlash-free hybrid elastomer coupling according to one of the preceding claims, characterized in that the coupling hubs ( 1 . 2 ) are formed of a non-ferrous metal or an alloy of a non-ferrous metal. Backlash-free hybrid elastomer coupling according to one of the preceding claims, characterized in that the thermosetting or thermosetting coating ( 3 ) consists of PET, PBT or PA and / or short fiber reinforced. Backlash-free hybrid elastomer coupling according to one of the preceding claims, characterized in that the elastomer ( 4 ) is a thermoplastic elastomer selected from TPO, TPV, TPU, TPC, TPS or TPA. Backlash-free hybrid elastomer coupling according to one of the preceding claims, characterized in that the coupling hubs ( 1 . 2 ) are made in one piece and means for rotationally fixed and / or axial fixation of a shaft in a centric shaft receiving ( 7 ) exhibit. Backlash-free hybrid elastomer coupling according to one of the preceding claims, characterized in that the coupling hubs ( 1 . 2 ) are made in several parts and / or detachable clamping shells ( 8th . 9 ) for fixing a shaft in a centric shaft mount ( 7 ) exhibit. A backlash hybrid elastomeric coupling obtainable by a method comprising the steps of: a. Die casting of two elongated hub bodies ( 1 . 2 ), one-sided with footprint ( 10 ) and from this axially projecting driving claws ( 5 . 6 ), of a non-metal or a non-metal alloy in a die-casting tool, b. Removal of the hub body ( 1 . 2 ), each insert in a first injection mold and injection molding of a thermosetting or thermosetting coating ( 3 c. Removal of the coated hub body ( 1 . 2 ) and common insert into a second injection mold, wherein the driving claws ( 5 . 6 ) of both hubs ( 1 . 2 Contactlessly engage each other and overlap in the axial direction, d. Injection of an elastomer ( 4 ) in between the hub bodies ( 1 . 2 ) located cavity.

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