CN109139846B

CN109139846B - Planetary roller screw transmission mechanism, actuator and separation system

Info

Publication number: CN109139846B
Application number: CN201810679065.1A
Authority: CN
Inventors: 拉尔斯·舒曼; 彼得·格雷布
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2017-06-27
Filing date: 2018-06-27
Publication date: 2023-05-12
Anticipated expiration: 2038-06-27
Also published as: CN109139846A; DE102017114198A1

Abstract

The invention relates to a planetary roller screw drive, an actuator having a planetary roller screw drive and a release system for a clutch device of a motor vehicle. The planetary roller spindle drive comprises a spindle and a plurality of planetary rollers which are mechanically coupled to the spindle and are arranged rotatably about their own longitudinal axis, each planetary roller having a cylindrical shoulder in which a plurality of circumferential grooves form a structure which meshes with the thread of the spindle, wherein the planetary roller spindle drive furthermore has a planetary roller carrier which supports the planetary rollers at least in the axial direction, wherein the planetary rollers have the same structure at least in the region of their structure and in the region of the distance of the structure to at least one axial end of the respective planetary roller and are positioned on the spindle at different axial positions. The planetary roller screw drive proposed here allows production and installation costs to be reduced.

Description

Planetary roller screw transmission mechanism, actuator and separation system

Technical Field

The invention relates to a planetary roller screw drive, an actuator having a planetary roller screw drive and a release system for a clutch device of a motor vehicle.

Background

To operate the clutch, a translational path must typically be traversed in order to disengage the clutch halves from each other or to engage them with each other. For this purpose, an actuating device, also called an actuator or an actuator, is required, and by means of this, the required forces can be generated on the respective paths. For this purpose, actuators exist which convert a rotational movement of one component into an axial movement of the other component, for example in order to open or close a clutch.

Typical actuators are hydraulic output cylinders, or also planetary roller screw drives. The planetary roller screw drive comprises a screw, a screw nut and planetary rollers arranged therebetween over the circumference and accommodated in a planetary roller carrier. One of the components, the spindle or the spindle nut, is rotationally driven and the other component can be displaced along the longitudinal axis of the spindle with a rotationally fixed arrangement with an axial displacement corresponding to the set transmission ratio.

WO 2015/081951 A1 discloses an actuator with a planetary roller screw drive (PWG), which is designed in particular as a clutch for operating a vehicle. The planetary roller screw drive comprises a central screw having a pitch, which is connected in a rotationally fixed manner to a rotor of the drive and can be driven about a rotational axis by the drive. The lead screw is engaged with the plurality of planetary rollers. The planetary rollers also engage with a ring gear surrounding the planetary rollers, the ring gear having grooves in the circumferential direction. The planetary rollers are positioned in the planetary roller carrier on both ends. Between the intermediate region of the respective planetary roller and the bearing in the planetary roller carrier, the planetary roller has, at the region of the two end faces, a shoulder of reduced diameter, which likewise has circumferentially extending grooves, wherein the profiled elements pressed between the grooves engage into complementarily configured grooves on the ring gear, so that via this profiling, axial forces can be transmitted into the ring gear and from there onto the planetary roller carrier.

It is known from DE 10 2015 204 587 A1 to provide planetary roller pairs on the circumference of the threaded spindle in a distributed manner, said planetary rollers engaging the threaded spindle and each other. The planetary roller structures of the corresponding pairs are identically constructed.

Disclosure of Invention

The invention is based on the object of providing a planetary roller screw drive, an actuator with a planetary roller screw drive and a release system for a clutch device of a motor vehicle, which combine reliable axial operation of the clutch device with a small installation space and low production and installation effort.

The object is achieved by a planetary roller screw drive, an actuator and a release system for a clutch device of a motor vehicle according to the invention. An advantageous design of the planetary roller screw drive is given below.

The features of the claims can be combined in any technically meaningful way, wherein the features from the following description and from the drawings, including additional embodiments of the invention, can also be considered for this purpose.

The terms radial, axial and circumferential are always in the scope of the invention with reference to the axis of rotation of the planetary rollers or the axis of rotation of the screw.

The invention relates to a planetary roller screw drive, which is designed in particular as part of an actuator for a release system of a clutch device of a motor vehicle. The planetary roller spindle drive comprises a spindle and a plurality of planetary rollers mechanically coupled to the spindle and rotatably arranged about their own longitudinal axis, each of which has a cylindrical shoulder in which a plurality of circumferential grooves form a structure which meshes with the thread of the spindle, wherein the planetary roller spindle drive furthermore has a planetary roller carrier which supports the planetary rollers at least in the axial direction. The planetary rollers are identically configured at least in the region of their structure and in the region of the distance between the structure and at least one axial end of the respective planetary roller, and they are positioned on the threaded spindle at different axial positions. The support of the planetary rollers can take place directly or indirectly. Preferably, the planetary rollers are identically constructed. The different axial positioning of the planetary rollers on the threaded spindle thus means that they are arranged at different angular positions about the rotational axis and at different axial positions along the rotational axis. In a corresponding manner, the structure or the individual circumferential grooves thereof which engage into the thread of the threaded spindle are also positioned axially differently, i.e. with respect to the preceding planetary roller, a fraction corresponding to a complete revolution of 360 ° with an axial distance corresponding to the fraction of the thread pitch of the threaded spindle.

The planetary roller screw drive is preferably designed such that it does not have a ring gear that surrounds or encloses the planetary rollers. This enables a radially very small design and thus greater flexibility when integrated into the existing drive train of the motor vehicle. Here, it should not be excluded according to the invention: an intermediate element, for example a coating, is arranged between the planetary rollers and the planetary roller carrier, which, however, does not have the function of transmitting torque between the planetary roller carrier and the spindle.

The threaded spindle is preferably arranged centrally and has a constant thread pitch. The guiding of the planetary rollers by rotation of the planetary roller carrier simultaneously brings about a positioning of the planetary rollers relative to one another in terms of their angular position about the common axis of rotation. The axis of rotation of the planetary rollers corresponds to its longitudinal axis.

In one embodiment of the invention, it is provided that the planetary roller spindle drive has at least one axial abutment element for each planetary roller, which abutment elements serve to axially support the respective planetary roller, wherein the respective abutment elements have different axial extensions. Thereby, different axial positions of the planetary rollers are ensured.

The abutment element can be an integral component of the planetary roller carrier. In particular, the abutment element can be formed by an axial limiting wall of the planetary roller carrier.

In a further alternative, it is proposed that the abutment element is a component of an intermediate ring which is arranged axially between the planetary rollers and the planetary roller carrier. This means that the planetary rollers are axially supported on an intermediate ring which is positioned axially beside the meshing shoulders and which is positioned in its radial position by the planetary roller carriers. The torsion resistance of the intermediate ring can be achieved in a form-fitting manner between the intermediate ring and the planetary roller carrier, for example by means of at least one coaxially extending pin which is inserted into a hole provided in a defined angular position, wherein the pin or the hole is provided in one of the two components, namely the intermediate ring and the planetary roller carrier, or on one of the two components, namely the intermediate ring and the planetary roller carrier, and the hole is correspondingly provided in the other component, respectively. In an alternative embodiment, the torsion resistance of the intermediate ring is achieved in a form-fitting manner between the intermediate ring and the planetary roller carrier, for example by means of external teeth on the intermediate ring, which interact with internal teeth of the planetary roller carrier in a defined angular position. Such an intermediate ring can be made of a suitable plastic.

Furthermore, the planetary rollers can each have a journal on at least one axial end, and the respective abutment element can be formed by a bore, wherein the bores can have different depths for differently axially positioning the planetary rollers.

The holes are thus provided in the intermediate ring or in the planetary roller carrier itself. The advantage of this embodiment is that a bore friction contact is formed between the pin and the bore bottom of the bore, which produces little friction losses. For this purpose, the axial ends of the journal are preferably spherically formed.

In a further alternative, it is proposed that the planetary rollers each have a journal of a first diameter at least one axial end, that the cylindrical shoulders of the respective planetary rollers have a second diameter which is greater than the first diameter of the journal, so that the cylindrical shoulders have an axial limiting surface, and that the respective contact elements are formed by body sections of different axial thickness for differently axially positioning the planetary rollers. The axial limiting surface is thus located between the cylindrical shoulder and the corresponding journal

The body sections of different axial thickness can be integral components of the intermediate ring or also of the planetary roller carrier itself. Such a body section can be formed in particular by a segment of a sector of the intermediate ring or of the planetary roller carrier, which has a different thickness than an adjacent sector.

The planetary rollers are preferably designed mirror-symmetrically, so that they are identically formed at their axially opposite ends, so that on both sides the same structural type of support is possible. Furthermore, the installation is thereby simplified.

In an alternative embodiment, it is provided that the planetary rollers have at least one axial end each an axially extending bore and that the respective contact element is formed by a pin and an axial contact surface, wherein the pin has different axial lengths and/or the contact surface has different axial positions for differently axially positioning the planetary rollers.

The abutment surface is the surface from which the journal extends. The axial support of the respective planetary roller can take place here via the bore bottom of the planetary roller and/or via an end face which bears against the abutment surface of the abutment element. The abutment element can also be realized here again by the intermediate ring or else by the planetary roller carrier itself.

In a further variant of the axial support, it is proposed that the planetary roller spindle drive has at least one ball for each planetary roller, on which ball the respective planetary roller is supported axially, wherein the respective ball is supported axially in a concave recess, which constitutes an axial abutment element for the axial support of the respective planetary roller (10). The concave recess is preferably formed in an axial limiting wall of the planetary roller carrier. The concave recesses have different depths in the axial direction, so that the balls located therein have different axial positions, so that the planetary rollers associated therewith are disposed in different axial positions. The axial support is thus effected indirectly via the respective ball in the described embodiment of the invention.

The balls serve to axially support the individual planetary rollers together with the roller bearing, and to ensure different axial positions of the planetary rollers. Thereby, friction loss when the planetary roller rotates is reduced. In the radial direction, the planetary rollers are preferably guided in an intermediate ring, but in the embodiment of the invention, they do not absorb axial forces.

Another aspect of the invention is an actuator having a planetary roller screw drive according to the invention and a rotary drive mechanically coupled to the planetary roller screw drive for driving elements of the planetary roller screw drive for translational movement. The actuator according to the invention can also be referred to as a Modular Clutch Actuator (MCA). The translational movement is performed by a rotationally fixed element of the planetary roller screw drive, such as, for example, a screw, and is used to actuate the clutch device for opening or closing. For this purpose, the planetary roller carrier of the planetary roller screw is connected in a rotationally fixed manner to the rotor of a drive device, by means of which the planetary roller carrier can be driven about its central axis of rotation, so that a translation of the screw takes place.

In order to achieve the object, a release system for a clutch device of a motor vehicle is provided, which has an actuator according to the invention and an interface for transmitting the generated translational movement to the clutch device.

A further subject matter of the invention is a system to be executed, in particular a clutch device, which has a separating system according to the invention, wherein the separating system is designed for converting a rotational movement of a rotating device into a translational movement for operating the clutch.

The planetary roller screw mechanism according to the invention is designed as a planetary roller screw mechanism with a constant transmission ratio, which complies with the pitch, and has the advantage that it enables reliable clutch operation with a small volume and low manufacturing costs and simple installation.

Drawings

The invention described above is explained in detail below in the relevant technical background with reference to the attached drawings, which show a preferred embodiment. The invention is not limited in any way by the purely schematic drawings, wherein it is noted that the embodiments shown in the drawings are not limited to the scope shown. The drawings show:

figure 1 shows a cross-section without a screw of the planetary roller screw drive of the first embodiment,

figure 2 shows a perspective view of the main force line direction in such a planetary roller screw drive,

figure 3 shows a cross-sectional view of the force loading of the planetary roller screw drive,

figure 4 shows a perspective view of the direction of the secondary force line in such a planetary roller screw drive,

figure 5 shows a perspective view of the planetary roller carrier of the first embodiment,

figure 6 shows a first perspective view of the intermediate ring of the first embodiment,

figure 7 shows a second perspective view of the intermediate ring,

figure 8 shows a side view of the intermediate ring,

figure 9 shows a perspective view of the intermediate ring in the planetary roller carrier,

figure 10 shows a cross-section of the intermediate ring in the planetary roller carrier,

figure 11 shows a side view of a planetary roller,

figure 12 shows a perspective view of a planetary roller,

figure 13 shows a cross-section without a screw of the second embodiment of the planetary roller screw drive,

figure 14 shows a perspective view of a planetary roller carrier of a second embodiment,

figure 15 shows a cross-section of a planetary roller carrier of a second embodiment,

figure 16 shows a first perspective view of the intermediate ring of the second embodiment,

figure 17 shows an intermediate ring of a third embodiment,

figure 18 shows a cross-section without a lead screw of the planetary roller screw drive of the third embodiment,

figure 19 shows a perspective view of the intermediate ring of the fourth embodiment,

figure 20 shows a perspective view of the intermediate ring of the fifth embodiment,

figure 21 shows a cross-section of a screw of the second embodiment,

figure 22 shows a perspective view of the screw,

fig. 23 shows a sectional view of the planetary roller screw transmission mechanism of the fourth embodiment with a screw.

Detailed Description

Various embodiments of a planetary roller screw drive according to the invention are shown in fig. 1, 13, 18 and 23. Common to these embodiments is a screw 1, respectively, which is not visible in the embodiments shown in fig. 1, 13 and 18. Fig. 23 shows a screw 1. In parallel to the respective spindle axis, a plurality of planetary rollers 10 are arranged on the circumference of the spindle, so that circumferential grooves 13 provided on cylindrical shoulders 11 of the respective planetary rollers 10 can engage with the threads of the spindle 1. The planetary rollers 10 are guided axially and/or radially by the planetary roller carrier 30, either indirectly or directly. The planetary roller carrier 30 forms part of a bearing 105 on its outer periphery.

The planetary roller carrier 30 can be placed in rotation and produces an axial feed movement of the threaded spindle, which is achieved in that: the rotational movement of the planetary roller carrier 30 is transmitted to the planetary rollers 10, the circumferential grooves 13 of which engage with the threads of the threaded spindle, so that the planetary rollers 10 interact like threaded nuts and convert the rotational movement into a translational axial movement of the rotationally supported threaded spindle. The translational movement is used to operate the clutch device for opening or closing thereof.

The principle can also work inversely by: as the screw rotates, it is screwed into the circumferential groove 13 of the planetary roller 10, which is axially fixed, but can rotate about its respective longitudinal axis 27. As a result, axial feed forces can be transmitted from the threaded spindle to the planetary rollers 10, which transmit them to the planetary roller carrier 30 via their direct or indirect support.

In the following, different embodiments of the planetary roller screw drive according to the invention are discussed. Fig. 1 shows a first embodiment of a planetary roller screw drive. The planetary roller 10 has journals 14 arranged on both sides, which are inserted into bores of an intermediate ring 50, which is arranged between the planetary roller 10 and the planetary roller carrier 30. The planetary rollers 10 are supported axially on a middle ring 50 shown on the left. The bores in the intermediate ring 50 for receiving the journals 14 have different depths here, as described in detail with reference to fig. 8. As a result, the individual planetary rollers 10 take on different axial positions 18, as can be seen from the position of the first axial groove of the planetary roller 10. As a result, the planetary rollers 10 are arranged axially offset, so that they can all be identically constructed and no specific planetary rollers 10 are required to be specifically associated with a specific angular position.

The intermediate ring 50 thus forms the abutment element 40 for the planetary roller 10.

The intermediate ring 50 shown on the left has a plurality of coaxially extending pins 60 on its side facing away from the planetary roller 10, which pins are arranged in corresponding bores 61 in the planetary roller carrier 30. This serves to prevent torsion of the intermediate ring 50.

The intermediate ring 50 in this case axially bears against the axial limiting wall 31 of the planetary roller carrier 30.

The middle ring 50 shown on the right has a through-opening for receiving the journal 14 arranged on the right. The axial support of the planetary rollers 10 takes place here via the end face of the journal 14. The intermediate ring 50 is fixed in its axial position by means of a fixing element 104 for axial fixing and in its angular position by means of a torsion element 103.

The intermediate ring is furthermore connected to a carrier plate 101, which optionally has friction surfaces 102 for external friction elements on an axial flange.

The different force lines and the loads caused by the forces acting can be seen in fig. 2-5. Fig. 2 shows a main force line 108, which is dominant in a planetary roller screw drive. It can be seen that the main force line 108 is guided through the spindle 1, from which it is guided onto the planetary rollers 10, and from which it is guided out again via the planetary roller carrier 30 and the bearing 150. By this, a corresponding main load 107 can be overcome, wherein the planetary roller screw drive is supported axially via the screw 1 by means of the counter force 161. Fig. 3 also shows a secondary load 110 in the opposite direction with dashed lines, wherein the planetary roller screw drive is supported in a corresponding manner axially via the screw 1 by means of a secondary counter force 109. The corresponding secondary force line 111 is shown in fig. 4.

Fig. 5 shows the planetary roller carrier 30 as a separate component. It can be seen here that the planetary roller carrier 30 has an axial limiting wall 31 on the axial end face, in which the bore 61 is arranged at a specific angular position. The hole 61 is intended to receive a pin 60 of the intermediate ring 50 shown on the right. At the end of the planetary roller carrier 30 on the end side, a torsion element 32 is provided, which is arranged with its axis parallel in the form of a bore, and an axial securing element 33 in the form of a bore.

Different views of the intermediate ring 50 arranged on the right can be seen in fig. 6-8. In particular, fig. 6 shows a bore 90 for receiving the axle journal 14 of the planetary roller 10. It can also be seen that the intermediate ring 50 has a central channel 72 for the threaded spindle. Fig. 7 shows a pin 60 extending axially parallel, which is designed for insertion into a bore 61 of the planetary roller carrier 30, see fig. 5.

Fig. 8 shows that the holes 90 in the intermediate ring 50 have different hole depths 91 in order to achieve different axial positioning of the individual planetary rollers.

Fig. 9 and 10 show the installed state of the intermediate ring 50 in the planetary roller carrier 30, wherein it is shown that the intermediate ring 50 is supported axially on the axial limiting wall 31 of the planetary roller carrier 30.

Fig. 11 and 12 show the planetary roller 10 in detail. In particular, a cylindrical shoulder 11 is visible, the second diameter 12 of which is greater than the first diameter 15 of the journal 14. This constitutes an axial limiting surface 16. The circumferential groove 13 forms an axial contact on the one hand in the main force line direction 19 and on its opposite side in the opposite force direction 20. On the end face of the journal 14, axial contact surfaces 21, 22 are defined, which serve to form the bore friction contact. The journal 14 itself forms a first radial slide bearing surface 23 and a second radial slide bearing surface 24 on its circumferential surface. The side of the cylindrical shoulder 11 facing away from the axial limiting surface 16 forms an axial contact surface 25 for introducing the force action of the secondary. It can be seen that the planetary roller 10 is symmetrically configured about the mirror symmetry plane 26.

Fig. 13 shows a further embodiment of a planetary roller screw drive according to the invention. The intermediate ring 50 is designed with external toothing 70 which cooperates in a positive manner with the internal toothing of the planetary roller carrier 30 in order to achieve torsion resistance of the intermediate ring 50.

Fig. 14 and 15 show a planetary roller carrier 30 designed for this purpose, in which case the insertion aid 114 in the form of a bevel on the end face is also apparent. To accommodate the fastening element 104 for axial fastening, the planetary roller carrier 30 has a circumferential groove 112.

Fig. 14 also shows that the inner wall of the planetary roller carrier 30 is designed as a centering device 113 for the respective intermediate ring 50. For the described embodiment of the planetary roller screw drive, the left intermediate ring 50 is designed differently from the intermediate ring shown so far. The intermediate ring 50 shown in fig. 16 corresponds to the intermediate ring shown in fig. 13 and has as a constituent part a plurality of contact elements 40 which are formed as body sections 41 of the intermediate ring 50. The body sections 41 each have a different thickness, so that the planetary rollers 10 are supported in different axial positions, with their axial limiting surfaces 16 resting on the body sections.

Accordingly, the recesses 43 provided in the axial limiting wall 31 of the planetary roller carrier 30 for accommodating the axial ends of the planetary rollers 10 have the same depth.

The intermediate ring 50 shown in fig. 17 is an alternative to the intermediate ring shown in fig. 13. It can be seen that the intermediate ring 50 has only a flat surface, since only an axial abutment for the planetary rollers 10 is provided on the intermediate ring.

Fig. 18 shows another alternative embodiment of a planetary roller screw drive according to the invention. The left side here corresponds to the embodiment shown in fig. 13, while the right side has a specially designed intermediate ring 50 with axially extending pins 73 which extend into correspondingly designed axially extending bores 17 in the planetary roller 10.

In fig. 19 and 20, different embodiments of the intermediate ring 50 are shown here. Fig. 19 shows such an intermediate ring 50 with a body section 41 of different thickness, respectively shown in fig. 16, from which a peg 73 extends. Fig. 20 shows an embodiment of the intermediate ring 50 without such a body section 41 of different thickness, so that the intermediate ring 50 forms a flat axial abutment surface 42. The intermediate ring 50 shown in fig. 20 is suitable for use on the right side of the planetary roller screw drive shown in fig. 18. The flat abutment surface of the embodiment of the intermediate ring 50 shown on the right in fig. 17 and 20 serves to absorb secondary forces along the secondary force line 111.

Fig. 21 and 22 show the shape of the planetary roller 10, as it is used in this embodiment of the planetary roller screw drive. Here, an axially extending bore 17 is clearly visible, which is arranged coaxially to the axis of rotation 2 of the planetary roller 10. Likewise, the planetary rollers 10 form an axial contact surface 25, as can be seen in fig. 22.

Fig. 23 shows a further embodiment of the planetary roller screw drive according to the invention, wherein the right side is constructed according to the embodiment in fig. 18. The left side is again designed such that a ball 100 is associated with each planetary roller 10, which ball is supported axially in a friction-fit manner on the planetary roller carrier 30 or on its axial limiting wall 31, in particular in the recess 43. The recesses 43 are preferably embodied here as negative shaped elements in the form of concave recesses, which each have a different axial depth, so that the balls 100 arranged therein have different axial positions, so that the planetary rollers 10 assigned to the balls are held in the different axial positions.

In the invention presented here, the necessary axial offset of the grooves of the planetary rollers arranged around the threaded spindle, which has a thread pitch, is achieved by the axial offset of the structurally identical planetary rollers. In this way, a reduction in production and installation effort can be achieved in the production of the planetary roller screw drive.

List of reference numerals:

1. screw rod

2. Axis of rotation

10. Planetary roller

11. Cylindrical shoulder

12. Second diameter

13. Circumferential groove

14. Journal of shaft

15. First diameter

16. Axial limiting surface

17. Axially extending bore

18. Different axial positions

19. Axial contact in the direction of the main force

20. Axial contact in opposite force direction

21. A first axial abutment surface

22. Second axial abutment surface

23. First radial sliding bearing surface

24. Second radial sliding bearing surface

25. Axial contact surface

26. Plane of mirror symmetry

27. Longitudinal axis

30. Planet roller carrier

31. Axial limiting wall

32. Torsion element

33. Axial fixing element

40. Contact element

41. Body section

42. Axial abutment surface

43. Concave part

50. Intermediate ring

60. Coaxially extending pin

61. Hole(s)

70. External tooth section at intermediate ring

72. Channel

73. Bolt

80. Internal toothing of a planetary roller carrier

90. Hole(s)

91. Depth of hole

100. Ball with ball body

101. Bearing plate

102. Friction surface for an external friction element

103. Torsion element

104. Fixing element for axial fixing

150. Bearing unit

161. Reaction force

107. Main load

108. Main force line

109. Secondary counter force

110. Auxiliary load

111. Auxiliary force line

112. Groove(s)

113. Centering device

114. Introduction aid

Claims

1. A planetary roller spindle drive, which is part of an actuator of a release system for a clutch device of a motor vehicle, comprises a spindle (1) and a plurality of planetary rollers (10) which are mechanically coupled to the spindle (1) and are arranged rotatably about their own longitudinal axis, each of which has a cylindrical shoulder (11) in which a plurality of circumferential grooves (13) form a structure which meshes with the thread of the spindle (1), wherein the planetary roller spindle drive furthermore has a planetary roller carrier (30) which supports the planetary rollers (10) at least in the axial direction,

it is characterized in that the method comprises the steps of,

the planetary rollers (10) are configured identically at least in the region of their structure and in the region of the distance between the structure and at least one axial end of the respective planetary roller (10), and are positioned on the threaded spindle (1) at different axial positions.

2. The planetary roller screw transmission mechanism according to claim 1,

it is characterized in that the method comprises the steps of,

the planetary roller spindle drive has at least one axial abutment element (40) for each planetary roller (10) for axially supporting the respective planetary roller (10), wherein the respective abutment element (40) has a different axial extension.

3. The planetary roller screw transmission mechanism according to claim 2,

it is characterized in that the method comprises the steps of,

the abutment element (40) is an integral component of the planetary roller carrier (30) and is formed by an axial limiting wall (31) of the planetary roller carrier (30).

4. The planetary roller screw transmission mechanism according to claim 2,

it is characterized in that the method comprises the steps of,

the abutment element (40) is a component of an intermediate ring (50) which is arranged axially between the planetary rollers (10) and the planetary roller carrier (30).

5. The planetary roller screw transmission according to any one of claims 2 to 4,

it is characterized in that the method comprises the steps of,

the planetary rollers (10) each have a pin (14) at least one axial end, and the respective abutment element (40) is formed by a bore (90), wherein the bore (90) can have different bore depths (91) for differently axially positioning the planetary rollers (10).

6. The planetary roller screw transmission according to any one of claims 2 to 4,

it is characterized in that the method comprises the steps of,

the planetary rollers (10) each have a journal (14) at least one axial end, said journal having a first diameter (15), and the cylindrical shoulder (11) of the respective planetary roller (10) having a second diameter (12), which is greater than the first diameter (15) of the journal (14), such that the cylindrical shoulder (11) has an axial limiting surface (16), and the respective abutment element (40) is formed by body sections (41) of different axial thicknesses for differently axially positioning the planetary roller (10).

7. The planetary roller screw transmission according to any one of claims 2 to 4,

it is characterized in that the method comprises the steps of,

the planetary rollers (10) each have an axially extending bore (17) at least one axial end, and the respective abutment element (40) is formed by a pin (73) and an axial abutment surface (42), wherein the pins (73) have different axial lengths and/or the abutment surfaces (42) have different axial positions for axially differently positioning the planetary rollers (10).

8. The planetary roller screw transmission mechanism according to claim 2,

it is characterized in that the method comprises the steps of,

the planetary roller spindle drive has at least one ball (100) for each planetary roller (10), on which the respective planetary roller (10) is axially supported, wherein the respective ball (100) is axially supported in a concave recess (43) which forms the axial abutment element (40) for axially supporting the respective planetary roller (10).

9. An actuator comprising a planetary roller screw drive according to any of claims 1-8 and a rotary drive mechanically coupled to the planetary roller screw drive for driving elements of the planetary roller screw drive for translational movement.

10. A decoupling system for a clutch device of a motor vehicle, comprising an actuator according to claim 9 and an interface for transmitting a generated translational movement to the clutch device.