Pulley decoupler

Abstract

The invention relates to a belt wheel decoupler having an input side and an output side and a common axis of rotation and at least one spring element acting between the input side and the output side, which can be twisted relative to one another in a circumferential direction against the spring action of the spring element, wherein the output side is rotatably supported relative to the input side by means of a bearing section on the input side, wherein the output side extends radially outward from the bearing section on a first side of the at least one spring element to a belt section with a flange section, wherein the at least one spring element is supported relative to the circumferential direction on a first stop of the input side and on a second stop of the output side by means of a spring force acting in the circumferential direction and is supported on the belt section at least relative to the radial direction by means of a sliding shell.

Description

TECHNICAL FIELD

[0001] The invention relates to a belt pulley decoupler having an input side, an output side, a common axis of rotation and at least one spring element acting between the input side and the output side, which spring element allows a relative torsional movement of the input side and the output side in the circumferential direction. In particular, in addition to the at least one spring element, the belt pulley decoupler also comprises at least one damping device (torsional vibration damper - TSD). BACKGROUND

[0002] The belt pulley decoupler is in particular designed for attaching a belt pulley on a crankshaft of a drive machine, for example of a motor vehicle. Thereby, at least a transmission of torsional vibrations, for example of the drive machine, to a belt driven by the belt pulley is reduced or prevented. However, the belt pulley decoupler can also constitute a dual mass flywheel.

[0003] Such a belt pulley decoupler or drive wheel is known from DE 10 2017 111 664.8 and DE 10 2017 113 043.8 as well as DE 10 2013 206 444 A1, wherein there a sealing and positioning of the drive wheel with respect to the outer surroundings, on the one hand, of an intermediate space / volume, which is at least partially filled with a lubricant, there the spring housing, on the other hand, in the axial direction is effected by means of a sealing and positioning device. For this purpose, between the traction means attachment area (output side) and the shaft attachment area (input side) a spring element (disc spring) is arranged, which tension these areas in the axial direction. The spring element is here held by means of a friction ring (non-elastic sealing lip), which also ensures the sealing effect.

[0004] The sealing of the intermediate space requires a very high level. Due to the higher requirements, different contamination tests are carried out, for example water immersion test, mud salt water test, dust test, salt mist test, water wading test.

[0005] A belt pulley decoupler is known from the later published DE 10 2019 126 589.4, wherein the otherwise known cover has been replaced by a sealing membrane. The stop for the at least one spring element provided from the output side is fixed on the output side.

[0006] There is always a demand for simplifying components for motor vehicles, for example belt pulley decouplers, and for reducing the manufacturing costs. SUMMARY

[0007] Starting from this, the task on which the invention is based is to provide a belt pulley decoupler, which is as simple as possible in its construction and in particular comprises as few components as possible.

[0008] This task is solved by a belt pulley decoupler according to the application. Further advantageous configurations of the application are given in the description. Features which are listed separately in the description can be combined with one another in a technically sensible manner and can define further configurations of the application. In addition, features of the application are specified and explained in the description, wherein further preferred configurations of the application are shown.

[0009] A belt pulley decoupler is proposed, which has an input side, an output side, a common axis of rotation and at least one spring element acting between the input side and the output side, which can be twisted relative to one another in a circumferential direction against the spring action of the spring element. The output side is rotatably supported relative to the input side by a bearing section via a (sliding) bearing arranged on the input side. The output side extends radially outward from the bearing section on a first side of the at least one spring element to a belt section (on which a belt can be arranged, which can be driven by the belt section or by the belt pulley decoupler) in a flange section. The at least one spring element is supported relative to the circumferential direction on a first stop of the input side and on a second stop of the output side with a spring force acting in the circumferential direction and is supported on the belt section at least relative to the radial direction by a sliding shell. The second stop is arranged on a driving portion, which is connected to the output side at least torsionally relative to the circumferential direction by a compression.

[0010] In particular, the input side (also referred to as shaft attachment region, since the input side is connectable or connected torsionally to a shaft, for example a crankshaft) can be twisted relative to the output side (also referred to as belt attachment region, since the output side is connectable or connected torsionally to a belt via the belt section) at most over an angular range extending in the circumferential direction (for example at most 30 degrees) against the spring force of the at least one spring element and in particular against the damping action of the at least one torsional vibration damper. The twisting is limited, for example, by stops (first stop, second stop).

[0011] The relative twisting of the input side relative to the output side, which is achieved against the spring force and possibly against the damping action, can at least reduce the torsional vibrations.

[0012] In particular, the driving portion is connected to the output side only by the compression. In particular, the driving portion is thus arranged on the output side torsionally and axially fixed.

[0013] The crimping, in particular, refers to a force-locked and form-locked connection between two components by plastic deformation. The deformation of the edge regions of at least one of the components is carried out in such a way that they are, in particular, inseparably wedged into one another. All materials that can be plastically deformed, such as plastics and metals, are suitable for crimping. Unlike material-locked connections, such as welded connections, different materials can also be joined together by crimping. High torques can be transmitted by crimping. The surface roughness of the components forming the crimping is particularly relevant for the size of the force that can be transmitted and the durability of the connection.

[0014] The arrangement of the entraining portion on the output side makes it possible to further reduce the assembly process and components. In particular, no additional connection of the entraining portion to the output side is required (i.e. in addition to the crimping). Thus, for example, a riveted connection between the component forming the second stop and the output side can be dispensed with. Furthermore, by attaching the entraining portion to at least one second stop on the output side, a fixing cap that is otherwise customary on the second side of the at least one spring element can be dispensed with. In particular, a sealing diaphragm can now be used there.

[0015] In particular, the entraining portion has an inner toothing on the inner circumferential surface. In order to constitute the crimping, the entraining portion can be pushed onto the outer circumferential surface of the output side with the inner toothing in an axial direction parallel to the rotational axis. The crimping is formed by the pushing on and the constitution of an outer toothing on the outer circumferential surface corresponding to the inner toothing.

[0016] In particular, the entraining portion has a higher hardness than the output side at least in the region of the inner toothing, in particular at least in the region of the outer circumferential surface.

[0017] In particular, the outer circumferential surface is implemented as cylindrical (i.e. flat and without an outer toothing) before the crimping is constituted. In particular, the outer toothing is formed only by the pushing on the entraining portion, wherein the outer circumferential surface is profiled by the inner toothing.

[0018] In particular, the outer circumferential surface is configured on a bearing section. In particular, the bearing section extends in the axial direction from the flange section. The bearing section of the output side is arranged radially outside the corresponding section of the input side, wherein the bearing is implemented as cylindrical and arranged between the bearing section and the input side. In particular, the bearing section has a cylindrical part section with an increasing diameter, onto which the entraining portion can be pushed, so that the outer toothing is constituted only in this part section.

[0019] In particular, after the arrangement of the entraining portion, a material bulge is formed on the outer circumferential surface by crimping, wherein the material bulge fixes the entraining portion on the output side at least with respect to the first axial direction.

[0020] In particular, the material bulge is produced by a tool for crimping.

[0021] The material bulge is a local increase in the outer diameter of the outer peripheral surface and, if necessary, of the partial section. The carrier portion is thus no longer able to be displaced along the axis of rotation towards the material bulge and is arranged in particular axially fixedly, i.e. with respect to both axial directions, on the output side.

[0022] Instead of or in addition to the material bulge, the carrier portion is fixed in particular with respect to the first axial direction on the output side by means of a safety plate which is connected to the flange section. The safety plate is arranged in particular such that the carrier portion is arranged between the safety plate and the flange section along the axial direction. The safety plate is connected to the flange section in particular form-locked with respect to the circumferential direction and also with respect to the axial direction (and also with respect to the radial direction).

[0023] The carrier portion comprises in particular an annular section which has an inner peripheral surface with an inner toothing. In particular, the second stop extends outwards along the radial direction from the annular section.

[0024] In particular, a sealing membrane extends from the belt section and on the second side inwards along the radial direction, the second side being opposite the first side in the axial direction extending along the axis of rotation. The sealing membrane is arranged only on the second side of the at least one spring element and generates a spring force acting in the axial direction between the input side and the output side.

[0025] Such a sealing membrane is known from the aforementioned, later published DE 10 2019 126 589.4.

[0026] In particular, the sealing membrane replaces a previously known cover which, together with a further component, for example a belt attachment region or a belt wheel, forms the output side. Furthermore, the sealing membrane replaces in particular additionally, if necessary, a friction ring by means of which a volume filled with fluid (lubricant, for example grease) in which the at least one spring element is arranged is sealed off with respect to the surroundings of the belt wheel decoupler. Furthermore, the sealing membrane replaces in particular an axial spring, for example a previously used disc spring, by means of which the output side and the input side are tensioned with respect to one another along the axial direction.

[0027] The sealing membrane is configured in particular annularly and encircling in the circumferential direction.

[0028] The sealing membrane is implemented in terms of material in particular in the manner of a known disc spring, for example from spring steel.

[0029] In particular, the at least one spring element is supported only on the first stop on the input side and on the second stop on the output side with a spring force acting in the circumferential direction. In particular, the support of the spring element with respect to the circumferential direction or the support of the spring force acting in the circumferential direction is not carried out by means of the sealing membrane.

[0030] In particular, the sealing membrane is supported on the input side by a friction ring. The friction ring is in particular annularly and encircling in the circumferential direction.

[0031] In particular, the friction ring is attached on the sealing membrane (or is connected to the sealing membrane against twisting with respect to the circumferential direction), wherein the friction ring is twistable with respect to the input side along the circumferential direction together with the sealing membrane and, if necessary additionally, the output side.

[0032] In particular, the at least one spring element is supported on the belt section at least with respect to the radial direction by a sliding shell, wherein the at least one spring element is movable with respect to the sliding shell at least along the circumferential direction.

[0033] The sliding shell is in particular arranged between the at least one spring element and the belt section along the radial direction. In particular, a sliding shell is provided for each spring element. In particular, each sliding shell is positionally fixed with respect to the circumferential direction by a first stop and a second stop.

[0034] In particular, the sliding shell has a matched or processed (for example coated or hardened) surface, so that friction and wear (in particular of the spring element, but possibly also of the sliding shell) occurring in the operation of the pulley decoupler can be reduced.

[0035] In particular, the sliding shell extends around the at least one spring element in a cross section extending parallel to the rotational axis and comprising the rotational axis over a first angular range of at least 20 degrees, preferably at least 30 degrees. In particular, the sliding shell extends around the at least one spring element in the cross section over a first angular range of at most 120 degrees, preferably at most 90 degrees, particularly preferably at most 60 degrees.

[0036] In particular, the sealing membrane is supported on the belt section with respect to the radial direction. In particular, the sealing membrane and the belt section form a sealing surface sealing the volume from the surroundings.

[0037] In particular, the sealing membrane is supported on the belt section with respect to the first axial direction and on the at least one spring element with respect to the second axial direction.

[0038] In particular, the sealing membrane contacts the at least one spring element or the sliding shell.

[0039] In particular, the belt section forms a third stop, with which the sealing membrane cooperates. The sealing membrane is supported on the third stop at least with respect to the first axial direction, if necessary also with respect to the second axial direction. The sealing membrane in particular forms a snap connection with the third stop.

[0040] In particular, the at least one spring element is arranged in a volume formed at least by the output side and the sealing diaphragm, wherein the volume is at least partially filled with a fluid (lubricant, e.g. grease) and is sealed on the second side from the surroundings of the pulley decoupler by the sealing diaphragm.

[0041] In particular, the torque is transmitted via the output side onto the belt section connected with the belt by means of the entraining portion forming at least one second stop and arranged on the output side.

[0042] In particular, it is thus not necessary to transmit the torque in the circumferential direction through the sealing diaphragm.

[0043] In particular, the sealing diaphragm can be embodied in the thickness of a disc spring and is supported on the input side or on a torsional vibration damper (TSD) by a friction ring.

[0044] In particular, the buckling of the at least one spring element can be prevented by a sliding shell. The sliding shell absorbs forces acting in the axial direction.

[0045] In particular, a friction ring is required here between the sealing diaphragm and the input side or towards the torsional vibration damper (TSD).

[0046] Furthermore, the sealing property of the friction ring can be improved in particular, since the sealing surface between the friction ring and the input side can be realized on a very small second diameter.

[0047] In particular, the centrifuging or balancing in the assembly can be cancelled in the pulley decoupler, since the output side with the stop has a much larger moment of inertia and can thus already be sufficiently balanced as a single component. The centrifuge, the balancing measuring device and the balancing correction device can thus be cancelled in the assembly. Furthermore, an improved corrosion protection can thus be achieved, since the balancing site can be coated.

[0048] The pulley decoupler is in particular provided for attaching a pulley on a crankshaft of a drive machine (e.g. of a motor vehicle). Thereby, at least the transmission of torsional vibrations (e.g. of the drive machine) to the belt driven by the pulley is to be reduced or prevented. However, the pulley decoupler can also constitute a dual-mass flywheel.

[0049] As a precaution, it is noted that the ordinal terms used here ("first", "second",...) are mainly (only) used to distinguish several objects, sizes or processes of the same kind, i.e. in particular do not prescribe a correlation and / or an order of these objects, sizes or processes relative to each other. If a correlation and / or an order is intended, this is explicitly stated here or is obvious to the person skilled in the art when studying the specifically described configuration. If a component can occur several times ("at least one"), a description of one of these components can equally apply to all or some of these components, but this is not mandatory. Attached Figure Description

[0050] The invention and technical field will now be explained in more detail with reference to the accompanying drawings. It should be noted that the invention is not limited to the embodiments cited. In particular, unless explicitly stated otherwise, aspects of the facts illustrated in the drawings can be extracted and combined with other components and known information in this specification. It should be particularly noted that the drawings, and especially the dimensional relationships shown, are merely schematic. The drawings show:

[0051] Figure 1 A side view shows the drive unit of a motor vehicle with a pulley decoupling mechanism.

[0052] Figure 2 The pulley decoupling device is shown in a three-dimensional view.

[0053] Figure 3 A first implementation variation of a known pulley decoupling is shown in a cross-sectional side view.

[0054] Figure 4 The pulley decoupler is shown in a cross-sectional side view.

[0055] Figure 5 The carrying part is shown in a side view; and

[0056] Figure 6 : Shown in cross-sectional side view according to Figure 4 A portion of the pulley decoupling device. Detailed Implementation

[0057] Figure 1 The drive unit 37 of a motor vehicle with a pulley decoupling unit 1 is shown in a side view. The pulley decoupling unit 1 guides the belt 38 for driving other components of the drive unit 37.

[0058] Figure 2 The pulley decoupler 1 is shown in a perspective view. A cover 34 seals the pulley decoupler 1 relative to the surrounding environment 31 on the input side 2. The belt section 12 and the cover 34 are components of the output side 3. The belt 38 is guided through the belt section 12.

[0059] Figure 3 A first implementation variation of the known pulley decoupling device 1 is shown in a cross-sectional side view.

[0060] The belt pulley decoupler 1 comprises an input side 2, an output side 3, a common axis of rotation 4, and at least one spring element 5 acting between the input side 2 and the output side 3, by means of which the input side 2 and the output side 3 can be twisted relative to one another in a circumferential direction 6. The output side 3 is rotatably supported relative to the input side 2 by means of a (sliding) bearing 8 arranged on the input side 2. The output side 3 extends radially 11 outwards on a first side 9 of the at least one spring element 5 from the (sliding) bearing 8 to a belt section 12 on which a belt 38 can be arranged, which can be driven by means of the belt section 12 or the belt pulley decoupler 1.

[0061] The sealing membrane 27 extends from the belt section 12 and radially 11 inwards on a second side 26 opposite the first side 9. The sealing membrane 27 is arranged only on the second side 26 of the spring element 5, and the sealing membrane 27 generates a spring force acting in the axial direction 21, 22 between the input side 2 and the output side 3.

[0062] The sealing membrane 27 replaces a previously known cover 34 which, together with further components, forms the output side 3. In addition, the sealing membrane 27 additionally replaces a friction ring 28, by means of which a volume 29 filled with a fluid 30 (lubricant, for example grease) is sealed relative to the surroundings 31 of the belt pulley decoupler 1, if necessary. In addition, the sealing membrane 27 replaces an axial spring (for example a previously used disc spring), by means of which the output side 3 and the input side 2 are tensioned relative to one another in the axial direction 21, 22.

[0063] Figure 4 The belt pulley decoupler 1 is shown in a cross-sectional side view. Figure 5 The entraining portion 16 is shown in a side view. Figure 6 A part of the belt pulley decoupler 1 according to Figure 4 is shown in a cross-sectional side view. The following is described Figures 4 to 6 together. Reference is made to the Figures 1 to 3 embodiments.

[0064] Unlike the belt pulley decoupler 1 according to Figure 3 , the entraining portion 16, which here constitutes the second stop 14, is fixed on the output side 3 by means of a press fit.

[0065] The belt wheel decoupler 1 comprises an input side 2, an output side 3, a common axis of rotation 4, and at least one spring element 5 acting between the input side 2 and the output side 3, against the spring action of which the input side 2 and the output side 3 can be twisted relative to one another in a circumferential direction 6. The output side 3 is rotatably supported relative to the input side 2 by a bearing section 7 via a (sliding) bearing 8 arranged on the input side 2. The output side 3 extends radially 11 outwards on a first side 9 of the at least one spring element 5 from the bearing section 7 to a flange section 10 to a belt section 12 on which a belt 38 can be arranged, which can be driven by the belt section 12 or by the belt wheel decoupler 1, with a flange section 10. The at least one spring element 5 is supported relative to the circumferential direction 6 on a first stop 13 on the input side 2 and on a second stop 14 on the output side 3 with a spring force acting in the circumferential direction 6 and on the belt section 12 at least relative to the radial direction 11 by a sliding shell 15. The second stop 14 is arranged on a driving portion 16, which is connected to the output side 3 at least relative to the circumferential direction 6 torsionally via a press fit 17.

[0066] The driving portion 16 has an inner toothing 19 on an inner circumferential face 18 (see details V in Figure 5 ). In order to constitute the press fit 17, the driving portion 16 can be pushed onto an outer circumferential face 20 of the output side 3 with the inner toothing 19 in an axial direction 21, 22 parallel to the axis of rotation 4. The press fit 17 is formed by the pushing onto the outer circumferential face 20 and by constituting an outer toothing 23 on the outer circumferential face corresponding to the inner toothing 19.

[0067] In particular, the outer circumferential face 20 is embodied as cylindrical (i.e. flat and without outer toothing 23) before the press fit 17 is constituted. In particular, the outer toothing 23 is formed only by the pushing onto the driving portion 16, wherein the outer circumferential face 20 is profiled by the inner toothing 19 (see details VI in Figure 6 ).

[0068] The outer circumferential face 20 is configured on the bearing section 7. The bearing section 7 extends from the flange section 10 in the first axial direction 21. The bearing section 7 of the output side 3 is arranged outside the corresponding section of the input side 2 in the radial direction 11, wherein the bearing 8 is embodied as cylindrical and arranged between the bearing section 7 and the input side 2. The bearing section 7 has a cylindrical partial section 39 of increasing diameter onto which the driving portion 16 is pushed, so that the outer toothing 23 is constituted only in this partial section 39.

[0069] After the arrangement of the driving portion 16, a material bulge 24 is formed on the outer circumferential face 20 by the press fit, wherein the material bulge 24 fixes the driving portion 16 on the output side 3 at least relative to the first axial direction 21.

[0070] The material bulge 24 is a local enlargement of the outer diameter of the outer peripheral surface 20 and of the partial section 39 thereof. The carrier portion 16 is thus no longer able to be displaced along the axis of rotation 4 towards the material bulge 24 and is arranged axially fixedly, i.e. with respect to both axial directions 21, 22, on the output side 3.

[0071] In addition to the material bulge 24, the carrier portion 16 is also fixed with respect to the first axial direction 21 on the output side 3 here by means of a safety plate 25 which is connected to the flange section 10 (see Figure 4 The safety plate 25 is arranged such that the carrier portion 16 is arranged between the safety plate 25 and the flange section 10 along the axial directions 21, 22. The safety plate 25 is connected to the flange section 10 by means of a rivet connection 35 which is form-locked with respect to both the circumferential direction 6 and the axial directions 21, 22 (and with respect to the radial direction 11) (see Figure 4 and see Figure 6 the opening for the rivet connection 35 in the flange section 10 in

[0072] The carrier portion 16 comprises an annular section which has an inner peripheral surface 18 with an inner toothing 19. From the annular section, the second stop 14 extends outwards along the radial direction 11 (see Figure 5 ).

[0073] The sealing membrane 27 extends from the belt section 12 and inwards along the radial direction 11 on a second side 26 which, in the axial directions 21, 22 which extend along the axis of rotation 4, is opposite the first side 9. The sealing membrane 27 is arranged only on the second side 26 of the at least one spring element 5 and generates a spring force acting in the axial directions 21, 22 between the input side 2 and the output side 3.

[0074] The spring element 5 is supported only on the first stop 13 of the input side 2 and on the second stop 14 of the output side 3 with a spring force acting in the circumferential direction 6. The support of the spring element 5 with respect to the circumferential direction 6 or the spring force acting in the circumferential direction 6 is not carried out by means of the sealing membrane 27. The sealing membrane 27 is supported on the input side 2 by means of a friction ring 28.

[0075] The spring element 5 is supported on the belt section 12 by means of the sliding shell 15 at least with respect to the radial direction 11, wherein the spring element 5 is movable with respect to the sliding shell 15 at least along the circumferential direction 6.

[0076] The sliding shell 15 is arranged between the spring element 5 and the belt section 12 along the radial direction 11. There is provided one sliding shell 15 for each spring element 5. Each sliding shell 15 is held positionally fixed with respect to the circumferential direction 6 by means of the first stop 13 and the second stop 14.

[0077] The sliding shell 15 extends around the spring element 5 over a first angular range 33 of 90 to 120 degrees on a cross section 32 extending parallel to the rotation axis 4 and comprising the rotation axis 4 (from a center point of the spring element 5 which is annular in the cross section 32).

[0078] In particular, the sealing membrane 27 is supported on the belt section 12 with respect to the radial direction 11. The sealing membrane 27 together with the belt section 12 forms a sealing surface which seals the volume 29 with respect to the surrounding 31.

[0079] The sealing membrane 27 is supported on the belt section 12 with respect to the first axial direction 21 and on the at least one spring element 5 with respect to the second axial direction 22. In particular, the sealing membrane 27 contacts the at least one spring element 5 or the sliding shell 15.

[0080] The belt section 12 forms a third stop 36 with which the sealing membrane 27 cooperates. The sealing membrane 27 is supported on the third stop 36 with respect to the first axial direction 21. The sealing membrane 27 forms a snap connection with the third stop 36.

[0081] The spring element 5 is arranged in a volume 29 formed at least by the output side 3 and the sealing membrane 27, wherein the volume 29 is at least partially filled with a fluid 30 (lubricant, e.g. grease) and is sealed with respect to the surrounding 31 of the pulley decoupler 1 on the second side 26 by the sealing membrane 27.

[0082] List of reference signs

[0083] 1 pulley decoupler

[0084] 2 input side

[0085] 3 output side

[0086] 4 rotation axis

[0087] 5 spring element

[0088] 6 circumferential direction

[0089] 7 bearing section

[0090] 8 bearing

[0091] 9 first side

[0092] 10 flange section

[0093] 11 radial direction

[0094] 12 belt section

[0095] 13 first stop

[0096] 14 second stop

[0097] 15 sliding shell

[0098] 16 carrying portion

[0099] 17 press-fit portion

[0100] 18 inner peripheral surface

[0101] 19 inner tooth portion

[0102] 20 outer peripheral surface

[0103] 21 first axial direction

[0104] 22 second axial direction

[0105] 23 outer tooth portion

[0106] 24 material bulge

[0107] 25 safety plate

[0108] 26 second side

[0109] 27 sealing diaphragm

[0110] 28 friction ring

[0111] 29 volume

[0112] 30 fluid

[0113] 31 ambient environment

[0114] 32 cross section

[0115] 33 first angular range

[0116] 34 cover

[0117] 35 clinch connection

[0118] 36 third stop

[0119] 37 drive machine

[0120] 38 belt

[0121] 39 partial segment

Claims

1. A pulley decoupling device (1) having an input side (2), an output side (3), a common axis of rotation (4), and at least one spring element (5) acting between the input side (2) and the output side (3), the input side (2) and the output side (3) being able to twist relative to each other in the circumferential direction (6) against the spring action of the spring element, wherein, The output side (3) is rotatably supported relative to the input side (2) by a bearing section (7) via a bearing (8) arranged on the input side (2); wherein the output side (3) extends outward from the bearing section (7) on a first side (9) of at least one spring element (5) via a flange section (10) in the radial direction (11) to a belt section (12); wherein the at least one spring element (5) is supported relative to the circumferential direction (6) by a spring force acting in the circumferential direction (6) on a first stop (13) on the input side (2) and a second stop (14) on the output side (3) and by a sliding housing (15) on the belt section (12) at least relative to the radial direction (11); wherein the second stop (14) is arranged on a carrying part (16), the carrying part being supported at least relative to the circumferential direction by a pressing part (17). The drive portion (16) is connected to the output side (3) in a torsion-resistant manner; the drive portion (16) has an internal tooth (19) on its inner circumferential surface (18); wherein, in order to form the pressing portion (17), the drive portion (16) can be pushed onto the outer circumferential surface (20) of the output side (3) along an axial direction (21, 22) parallel to the rotation axis (4) with the internal tooth (19), the outer circumferential surface (20) being constructed on the bearing section (7), wherein the pressing portion (17) is formed by the pushing and by forming an external tooth (23) corresponding to the internal tooth (19) on the outer circumferential surface; after the drive portion (16) is arranged, a material protrusion (24) is formed on the outer circumferential surface (20) by pressing, wherein the material protrusion (24) fixes the drive portion (16) at least relative to the first axial direction (21) on the output side (3).

2. The pulley decoupling device (1) according to claim 1, wherein, The carrying part (16) is fixed to the output side (3) at least relative to the first axial direction (21) by a safety plate (25) connected to the flange section (10).

3. The pulley decoupling device (1) according to claim 1, wherein, A sealing diaphragm (27) extends from the belt section (12) and inward along the radial direction (11) onto a second side (26), which is opposite to the first side (9) in an axial direction (21, 22) extending along the rotation axis (4). The sealing diaphragm (27) is arranged only on the second side (26) of the at least one spring element (5). The sealing diaphragm (27) generates a spring force acting in the axial direction (21, 22) between the input side (2) and the output side (3).

4. The pulley decoupling device (1) according to claim 3, wherein, The sealing diaphragm (27) is supported on the input side (2) by a friction ring (28).

5. The pulley decoupling device (1) according to claim 4, wherein, The sealing diaphragm (27) is supported on the belt section (12) relative to the radial direction (11).

6. The pulley decoupling device (1) according to claim 5, wherein, The sealing diaphragm (27) is supported on the belt section (12) relative to the first axial direction (21) and on the at least one spring element (5) relative to the second axial direction (22).

7. The pulley decoupling device (1) according to claim 6, wherein, The at least one spring element (5) is arranged in a volume (29) formed at least by the output side (3) and the sealing diaphragm (27), wherein the volume (29) is at least partially filled with fluid (30) and is sealed on the second side (26) by the sealing diaphragm (27) relative to the surrounding environment (31) of the pulley decoupler (1).

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