Coupling device

Abstract

A coupling device for connecting drivable tool spindles which can be inserted exchangeably into a tool turret, with a drive in the tool turret, at least comprising - a drive-side part (12), - an output-side part (14), and - a connecting part (16) which is arranged in between, wherein all these parts (12, 14, 16) are connected to one another in one piece and at least partially delimit a common interior space (18) peripherally with one another, characterized in that the interior space (18) which can be assigned to the output-side part (14) is delimited by two mating surfaces (20, 22) which, between them, receive an internal thread (24) which separates the two mating surfaces (20, 22) from one another.

Description

[0001] Coupling device

[0002] The invention relates to a coupling device for connecting drivable tool spindles, which can be interchangeably inserted into a tool turret, with a drive in the tool turret, at least consisting of - a drive-side part,

[0003] - a driven-side part, and a connecting part arranged therebetween, wherein all these parts are integrally connected to one another and at least partially delimit a common interior space circumferentially.

[0004] DE 42 28 946 C2 discloses a spindle head for tool turrets with a housing in which a spindle is rotatably mounted and with an anti-rotation device which has a bushing which is arranged on the spindle in a longitudinally displaceable but non-rotatable manner and on which a securing element is provided which, in its active position, in which the axial displacement range of the bushing is positively limited in one direction, is in engagement with a securing element of the housing and can be brought out of engagement with the securing element of the housing by an axial displacement of the bushing against the force of a pre-tensioned spring, wherein of the surfaces which interact without self-locking in the active position of the securing elements, at least that of one securing element is inclined with respect to the axial direction to an extent which excludes self-locking.In this way, the torque that can be transmitted via the locking elements can be easily limited to a value that prevents damage or destruction. Another advantage is that the beveled surface ensures that the anti-rotation device is free of play and therefore holds the spindle in a precisely defined position relative to the housing. This ensures that the coupling profile typically provided on the spindle is precisely aligned with the profile of the coupling counterpart.

[0005] DE 10 2018 003 941 A1 discloses a coupling device for establishing a drive connection between a drive part in a work station of the tool disk of a tool turret and an output part of a machining unit attachable to the tool disk. Complementary gearings are provided on the drive and output parts and can be brought into engagement with one another to establish the drive connection. A compensation device is provided by means of which the play between the engaged gearings can be reduced. This enables backlash-free or at least backlash-reduced torque transmission, even though only rough tolerances are maintained for the coupling gearings.

[0006] DE 10 2014 003 336 B4 discloses a tool turret with a base body defining a turret axis around which a tool disk is rotatably mounted on the base body, said tool disk having a plurality of drivable tools distributed around its circumference, which can be moved by rotating the tool disk in a predeterminable sequence into a working position in which a tool drive with its drive-side coupling part for driving the respective tool comes into a coupled position with a respective tool-side coupling part, wherein at least one of the coupling parts comes into the coupled position with the respective other coupling part by means of an actuator device by an axially directed feed movement and into the uncoupled position opposite to this feed movement, wherein one coupling part is designed in the manner of a pot,whose inner wall at least partially forms the torque-transmitting coupling surface, wherein the other coupling part is designed in the manner of an engagement pin, the outer surfaces of which are at least partially in contact with the inner wall of the other coupling part, forming the contact surface in the engaged position, and wherein the pot has a passage in the wall of the pot on sides diametrically opposite its longitudinal axis, which serves to accommodate a rail that guides and prevents rotation of the pot of one coupling part as soon as it leaves the working position with the drivable tool. Thus, for a coupling connection without torsional play, only the coupling surfaces on the coupling parts that are effective for torque transmission must be closely toleranced in order to achieve very good operational reliability even at high speeds and with high torques to be transmitted.

[0007] Based on this prior art, the invention seeks to provide a coupling device for connecting drivable tool spindles to an associated drive in the tool turret, which allows backlash-free torque transmission while simultaneously implementing a largely standardized connection of tool spindles to associated drives. This object is achieved by a coupling device having the features of patent claim 1 in its entirety.Because, according to the characterizing part of patent claim 1, the interior of the coupling device attributable to the output-side part is delimited by two mating surfaces that accommodate an internal thread between them, separating the two mating surfaces from each other, a standardized interface is created between the tool spindles and the drives. This allows each coupling device to be designed to match the respective counterpart (tool spindle, drive) with relatively little manufacturing effort, relative to the two mating surfaces and the internal thread, which is preferably designed as a fine-pitch thread. In addition to the fundamentally desired standardization, the previous variety of parts, as demonstrated in the prior art, can also be avoided.This eliminates the need to design the connection between the spindle / pinion shaft and the coupling device differently for each driven tool or each driven tool design, as was previously the case. This would require a separate spindle for each driven tool design, which is very costly. Rather, the standardized coupling device according to the invention eliminates these costs.

[0008] In a particularly preferred embodiment of the coupling device according to the invention, the one mating surface facing away from the drive-side part is selected to have a larger diameter than the diameter of the other mating surface facing the drive-side part. This allows the coupling device to be seamlessly adapted to a wide variety of spindle geometries, which in turn form an interface with the coupling device.

[0009] In a further preferred embodiment of the coupling device according to the invention, the connecting part is provided with a reduced or enlarged diameter on the outer circumference compared to the drive and output-side parts, whose outer diameters are essentially the same or different from one another. It has been shown that with such a modular design, very high torques can generally be transmitted without causing distortion in the connecting components of the coupling device.

[0010] This is also helped if the length of the connecting part essentially corresponds to the length of the output-side part.

[0011] In a further preferred embodiment of the coupling device according to the invention, the drive-side part has a tooth tip on its outer circumference or is formed from a flat piece. This tooth tip with its shaft toothing can be designed as a so-called VDI interface, for example according to DIN 5480 or DIN 5482 in the version valid at the time of filing this patent. The design as a flat piece is realized in various versions, including within the framework of competitive solutions, in a standardized design. In any case, however, it is ensured that the flat piece can be used as a standardized component for aligning the spindle drive prior to commissioning as a rotating machining tool by aligning the flat piece with an annular guide rail of the tool turret, as shown by way of example in DE 10 2014 003 336 B4.Instead of a tooth tip or a flat piece, any suitable connection geometry can be used.

[0012] In a further preferred embodiment of the coupling device according to the invention, the internal thread terminates in a run-out in the direction of the drive-side part, the diameter of which lies between the diameters of the two mating surfaces. In this way, the serrated internal thread terminates in the run-out, so that stress peaks can be diverted into the run-out without this leading to material distortion of the coupling device. The run-out also enables simplified manufacture and machining of the internal thread. In a further preferred embodiment of the coupling device according to the invention, the two mating surfaces are arranged coaxially to a drive axis of the coupling device, the axial lengths of which, viewed parallel to the drive axis, essentially correspond to one another.This results in a transmission behavior with essentially no play regarding the torque to be transmitted, and angle errors caused by an offset from the drive axis to the output axis with the connecting axis interposed are avoided.

[0013] In the context of assembly standardization, it has proven particularly advantageous to select the mating surfaces within a tolerance range of 0.008 mm, for example, from -0.001 to 0.007 mm. Diameters of 12 or 15 mm are preferred for the interior.

[0014] As part of the standardization, it is also provided that in the event that the drive-side part has a tooth head, the corresponding part of the interior has another internal thread.

[0015] It has proven particularly advantageous to provide a system consisting of a coupling device, as presented above, in conjunction with a connectable spindle drive and with a connection geometry adapted to the coupling device, consisting of two mating surfaces and an external thread of the connectable spindle drive arranged between them, which can be brought into engagement with the internal thread of the coupling device between the input and output parts. This system can be used to couple both linear and angled driven tools.

[0016] The coupling device according to the invention is explained in more detail below using exemplary embodiments shown in the drawings. In a schematic representation, not to scale, Figure 1 shows a perspective external view of an embodiment of the coupling device;

[0017] Figure 2 shows a longitudinal section through Figure 1;

[0018] Figure 3 shows an enlarged view of a detail marked "X in a circle" in Figure 2;

[0019] Figure 4 is a perspective external view of another

[0020] Design of the coupling device with flat piece;

[0021] Figure 4a is a front view of the flat piece according to Figure 4, which is accommodated between two partially shown guideways;

[0022] Figure 5 shows a longitudinal section through Figure 4;

[0023] Figure 6 shows an enlarged detail marked "Y in a circle" in Figure 5:

[0024] Figure 7 is a perspective external view of a

[0025] Coupling device for coupling a tool spindle;

[0026] Figure 8 shows a longitudinal section through the tool spindle according to Figure 7;

[0027] Figure 8a is a perspective external view of a spindle holder with a tool spindle mounted therein;

[0028] Figure 9 in the form of an exploded view shows a longitudinal section through the spindle holder according to Figure 8a with the coupling device arranged on the base side according to Figures 1 to 3;

[0029] Figure 10 is an exploded view of a longitudinal section through an angled tool spindle with a coupling device arranged on the base side according to Figures 1 to 3; and

[0030] Figure 11 shows a longitudinal section through the coupling device according to Figures 4 to 6, which is accommodated in a partially illustrated tool spindle. Figure 1 shows an embodiment of the coupling device as a whole in the form of a perspective external view. Such coupling devices serve to connect drivable tool spindles 10 (Figure 7), which can be interchangeably inserted into a tool turret via receptacles 11 (Figure 8a), to a drive in the tool turret.

[0031] The coupling device comprises a drive-side part 12 and an output-side part 14, as well as a connecting part 16 arranged therebetween. All of the aforementioned parts 12, 14, 16 are integrally connected to one another and circumferentially define a common interior space 18, as shown in detail in Figure 2. The part of the interior space 18 associated with the output-side part 14 is defined by two mating surfaces 20, 22, which receive an internal thread 24 between them, separating the two mating surfaces 20, 22 from one another. The mating surfaces are formed from hollow-cylindrical wall sections of the device housing 23.

[0032] One mating surface 20, which faces away from the drive-side part 12, is selected to be larger in diameter than the diameter of the other mating surface 22, which faces the drive-side part 12. This design creates a unified interface between the tool spindles 10 and the tool turret drives, so that each coupling device is standardized and thus designed to match the respective counterpart (tool spindle, drive).

[0033] As can be further seen from Figures 1 and 2, the part 16 to be connected has a reduced diameter on the outer circumference compared to the drive-side part 12 and the output-side part 14. Furthermore, the length of the connecting part 16 essentially corresponds to the length of the output-side part 14. According to the illustration in Figure 1, the drive-side part 12 has a tooth tip 26 on its outer circumference. Such tooth tips 26 with coupling teeth in the form of a spline shaft profile 28 are known, for example, from DE 42 28 946 C2. The known solution relates to a spindle head for tool turrets with a housing as the receptacle in which a tool spindle is rotatably mounted.Furthermore, an anti-rotation device is provided, which has a bushing which is arranged on the tool spindle so as to be longitudinally displaceable but non-rotatable, and on which a securing element is provided which, in its effective position in which the axial displacement range of the bushing is positively limited in one direction, is in engagement with a securing element of the housing and can be brought out of engagement with the securing element of the housing by an axial displacement of the bushing against the force of a pre-tensioned spring.Since the bushing, like the end of the spindle provided with the spline profile, protrudes from the housing in the effective position of the anti-rotation device in the form of the tooth tip, the anti-rotation device is automatically released by displacement of the bushing against the force of the coil spring when the spindle end in the form of the tooth tip is inserted into a coupling counterpart, which, on the tool turret side, serves to drive the spindle head or the tool spindle. In this respect, the tooth tip 26, as part of the coupling device according to the invention, with its spline profile 28, forms the coupling part for driving the spindle head as a whole, as shown, for example, in Figure 8a.

[0034] As Figure 3 shows in particular in an enlarged view, the internal thread 24 opens into an annular channel-like outlet 30 in the direction of the drive-side part 12, which, viewed in cross-section according to Figure 3, has a straight, ramp-like rise 32 in the direction of the first mating surface 20 and an arcuate or curved transition point 34 in the direction of the second mating surface 22. In this way, particularly good, notch-free force absorption is achieved if an external thread 36 (Figure 8) of the tool spindle 10 is screwed to the internal thread 24 of the coupling device in order to transmit torque from the tool drive in the tool turret to the tool spindle 10, which has a receiving space 38 for receiving a conventional cutting tool or for a modular clamping system. Ultimately, this is a thread undercut, which can also be omitted if necessary.

[0035] The two mating surfaces 20, 22 are arranged coaxially to a longitudinal or drive axis 40 of the coupling device, and the axial length of the two mating surfaces 20, 22, viewed parallel to the longitudinal or drive axis 40, essentially corresponds to one another. Viewed in the direction of Figure 2, one of the mating surfaces 20 opens into the surrounding area with its left end face via a stepped widening. On the opposite end face, the mating surface 20 merges into the internal thread 24 on the inner circumference, which is designed as a fine thread. In contrast, the other mating surface 22 opens into the outlet 30 with its one free end face, and opens into a central channel 44, similar to a through-bore, via stepped diameter reductions 42. Starting from the other mating surface 22, the central channel 44 merges into a stepped widening bore 46 with another internal thread 48.The stepped bore 46 emerges into the surroundings to the right as viewed in the direction of Figure 2 and is enclosed together with the further internal thread 48 by the tooth head 26 with the spline profile 28.

[0036] As part of the assembly standardization, it is intended that, for an example diameter of 12 to 15 mm for the interior 18, the mating surfaces 20, 22 preferably each lie within a tolerance range of -0.001 to 0.007 mm. Other diameters and other tolerance ranges can also be used; the decisive factor is the difference between the two mating surfaces 20, 22 with a total value of 0.008 mm. In this respect, a standardization of the interface in the form of the coupling device takes place across the tolerance range. By using two mating surfaces 20, 22 with their respective fitting diameters and the internal thread 24 in the form of a fine thread, each coupling device can be assigned to the appropriate counterpart, so that the multitude of possible spindle / pinion shaft combinations can be used universally.In particular, the tooth tip 26 can be designed according to VDI-DIN 5480 or VDI / DIN 5482; common coupling standards for coupling a wide variety of drivable tools to a tool turret drive for machining. The interior space 18, which runs continuously through the coupling device and opens into the environment in both directions, ensures a smooth coupling process, both at the tool drive and at the respective tool spindle 10. When joining the internal thread 24 with the external thread 36, an adhesive connection can also be provided additionally or alternatively for the transmission of pressure torque.

[0037] The tool spindle 10 shown in Figures 7 and 8 has, on the outer circumference opposite the receiving space 38, the external thread 36, which is also designed as a fine thread and can be brought into engagement with the internal thread 24 of the coupling device. Adjacent to both sides of this external thread 36 are two outer fitting surfaces 50, 52, which, when the tool spindle 10 is screwed into the coupling device, are in surface contact with the fitting surfaces 22 and 20 of the coupling device, respectively. This enables a backlash-free torque transmission via the standardized fitting surfaces of the coupling device and the tool spindle 10. Therefore, the assembly 36, 50, 52 of the tool spindle 10 must be adapted to the receiving assembly 14, 20, 22 of the coupling device in order to ensure the desired standardization for the interface in question.When the coupling is established between the tool spindle 10 and the coupling device, the longitudinal or drive axis 40 of the coupling device is congruent with the longitudinal axis 54 of the tool spindle 10. When joining the internal thread 24 with the external thread 36, an adhesive connection can also be provided additionally or alternatively for the torque transmission.

[0038] As can be further seen from Figures 7 and 8, the receiving space 38 of the tool spindle 10 is delimited on its free end face by an annular flange 56 which has two receiving bores 58 for an actuator (not shown), which is, however, usual in such tool clamping systems, so that this will not be discussed in more detail at this point. The two bores 58 are located diametrically opposite one another by 180° with respect to the longitudinal axis 54, so that regardless of the installation position of the tool spindle 10 in the holder 11, as shown by way of example in Figure 8a for a differently configured tool spindle 10, there is always a mounting bore 58 for the respective actuator in the 0° position, i.e. which is arranged on the holder 11 in such a way that the tool spindle 10 can be handled or operated from the front, i.e. from the free front side of the tool turret, within the scope of an automation, for example for the purpose of carrying out a clamping system exchange.The actuators inserted into the receiving bores 58 act on the central receiving and centering diameter 60 in the annular flange 56 in such a way that a clamping system (not shown) with a clamping cone or directly a machining tool can be secured in an interchangeable manner. The hole pattern 62 arranged on the free end face of the tool spindle 10 in Figure 7 can also be used for the alignment and fastening of a modified or modular clamping system. This can also be achieved with any additional "straight divider," i.e., instead of two receiving bores 58, four, six, eight, etc., receiving bores 58 can be provided to achieve the desired effect.

[0039] The further embodiment of a coupling device according to the figures

[0040] 4 to 6 differs from the embodiment according to Figures 1 to 3 in that, instead of a tooth head 26 with a splined shaft profile 28, a flat piece 64 is provided as the drive-side part 12 of the coupling device. The corresponding components of the two types of coupling devices are given the same reference numerals, so that the statements made so far for the first embodiment also apply to the second embodiment. The flat piece 26 essentially consists of two opposing parallel surfaces 66 with a greater extent than the two adjoining transverse surfaces 68, which are convexly curved outwards, and the flat piece 64 merges essentially flush into the adjoining outer circumference of the device housing 23 in the region of the two opposing transverse surfaces 68.

[0041] EP 0 596 956 B1 has already demonstrated the use of such a flat piece in a coupling device. The known solution relates to a tool turret for a machine tool, in particular a lathe, with a turret mounted on a turret support so as to be rotatable about a turret axis, which has a plurality of tool stations, each of which has a receptacle at several of its tool stations for inserting a tool holder, which has a tool spindle, for a rotatably driven tool.The tool drive shaft used here is arranged in such a way that it defines a working position for the tool stations, wherein a tool drive coupling is provided to establish a rotary drive connection between the tool drive shaft and the tool spindle of a tool holder in the working position, said coupling having at least two separable coupling elements, a first of which is in rotary drive connection with the tool drive shaft and the second of which is arranged in the form of the flat piece on the tool spindle.If the two coupling elements are disengaged from one another and the tool spindle is pivoted with the rotation of the tool disk, at least one circular guide is provided which leaves the area of ​​the coupling engagement free for the torque transmission by means of the coupling elements and which ensures that the flat part of the tool spindle always remains in a position that maintains a basic alignment which immediately ensures that the coupling position provided for this purpose is assumed for the torque transmission.

[0042] Comparable to this and in accordance with the illustration in Figure 4a, the flat piece 64 with its two opposing parallel surfaces 66 is guided between two rail-like guideways 70, of which only one guideway 70 may be sufficient for guiding the flat piece 64 as the head piece of the coupling device. In this respect, the respective guideway 70, as shown in the prior art, is designed as a ring with a free area in which the coupling engagement between the tool drive and the tool spindle 10 takes place via the coupling device according to Figures 4 to 6.

[0043] Otherwise, the coupling device according to Figures 4 to 6 is constructed similarly to the coupling device according to Figures 1 to 3, with the proviso that the central channel 44 continuously connects the interior 18 to the surroundings via the stepped bore 46 at the beginning. In this respect, the widening stepped bore 46 according to Figure 2 is now shifted to the point of transition between the further fitting surface 22 and the central channel 44. As Figures 4 and 5 in particular show, the outer contour of the device housing 23 in the area of ​​the two fitting surfaces 20, 22 and the internal or fine thread 24 located therebetween is also designed slightly differently, with the proviso that, again in a standardized design, the tool spindles 10 suitable for this purpose can be coupled to the coupling device via the individual components 20, 22, 24. The solution according to Figure 11 shows such a coupling in more detail.As the sectional view of Figure 11 shows, the screw-in depth of the coupling device is varied by means of an inserted compensating ring 72 of a predefined size, viewed in the axial direction to the longitudinal axis 54, thus allowing the coupling device to be adapted to different designs of a tool spindle 10. The pitch of the thread engagement with the thread pair 24, 36 can be used to ensure that the coupling device is correctly oriented on the tool spindle 10. The coupling device, with the tool spindle 10 mounted thereon, is mounted in the spindle holder 11 via a bearing 74 of conventional design and is thus also sealed from the environment by a lip seal 76, the use of which is also common in this field.Thanks to the respective guideway 70 as shown in Figure 4a, the flat piece 64 is oriented such that the mounting holes 58 with the respective actuator are positioned so that the driven tools or clamping systems are appropriately prepared for automated changeover operation. Depending on which parallel surface 66 is arranged at the top or bottom according to the arrangement shown in Figure 4a, one mounting hole 58 is directed forward and the other is directed forward, which enables access by handling systems from the front of a tool turret for automatic changeover operations. The aforementioned bearing 74 is not absolutely necessary and can be omitted if necessary.

[0044] Figure 9 now shows, in the form of an assembly drawing, a spindle head in an axial, rectilinear design for tools with an internal coolant supply 78, which can be inserted into a tool disk of a tool turret. For this purpose, a tool spindle 10, as shown by way of example in Figures 7 and 8, is rotatably mounted in a spindle head housing 82 as the receptacle 11 by means of two axially spaced bearings 80, for example in the form of rolling bearings. The lower end section 84 of the tool spindle 10, as viewed in the direction of Figure 9, extends through a hollow shaft 86 formed on the spindle head housing 82 and adjoining one end face thereof, resulting in a connection diagram comparable to that shown in Figure 11, with the proviso that a coupling device according to Figures 1 to 3 is used.In this respect, the external threads 36 of the tool spindle 10 then engage with the internal thread 24 of the coupling device while simultaneously engaging the mating surface pairs 50, 22 and 52, 20. In this way, a standardized interface is created via the mentioned thread sections and the hollow cylindrical mating surfaces, which allows the connection of a wide variety of tool spindles to the respective coupling device in order to establish the connection of the spindle drive via the coupling device to the tool spindle 10 in the manner of an industry standard.

[0045] In the assembled state of the standardized interface solution according to Figure 9, an image as shown in Figure 8a results, in which the tooth tip 26 of the coupling device protrudes with a predeterminable axial projection beyond the lower free end face of the hollow shaft 86. The tool spindle 10 shown in Figures 8a and 9 is preferably the same as shown in Figures 7 and 8; even if not all details from Figures 7 and 8 are graphically reproduced. In any case, in the assembled state according to Figure 8a, the coupling device, except for the tooth tip 26 at the lower end, is completely enclosed by the hollow shaft 86 of the spindle head housing 82, and thus the coupling between the coupling device and the tool spindle 10 also essentially takes place within the aforementioned hollow shaft 86 of the spindle head housing 82.

[0046] The assembly drawing according to Figure 10 basically corresponds to the structure according to Figure 9, with the proviso that so-called angled drive spindle heads are used, with a drive part 88 separate from the actual spindle head, which drives the tool spindle 10 via an angular gear 90, with its longitudinal axis 54 now perpendicular to the longitudinal or drive axis 40 of the coupling device. The spindle head housing 82, as the receptacle 11 for the tool spindle 10, is constructed in several parts here; in particular, base and edge end parts 92 and 94, respectively, are provided to complete the spindle head housing 82 as a whole. This makes it clear that, regardless of a straight and / or angular design of the respective spindle head solution, a standardized connection option exists via the respective coupling device according to Figures 1 to 3 or 4 to 6.Regardless of whether a tooth head 26 or a flat piece 64 is used for the coupling device, it is preferably provided that at least one of the two receiving bores 58 for an actuator is located at the top, as indicated in Figure 10. The other receiving bore 58, which is arranged at the bottom at 180° diametrically to the longitudinal axis 54 with respect to the upper bore 58, necessarily occupies this lowermost position. For the sake of simplicity, the two bores 58 are not shown in detail in Figure 10. In this respect, too, an angled spindle head solution therefore offers the possibility of automated actuation. In any case, the bores 58 must be arranged symmetrically to the longitudinal axis. Only with this can automation and the necessary balancing quality be achieved. The rotary position of the bores 58 is achieved by grinding in the ring 72; without this ring, secure rotary positioning cannot be achieved.

Claims

Patent claims 1 . Coupling device for connecting drivable tool spindles (10), which can be interchangeably inserted into a tool turret, to a drive in the tool turret, at least consisting of a drive-side part (12), - an output-side part (14), and a connecting part (16) arranged therebetween, wherein all of these parts (12, 14, 16) are connected to one another in one piece and at least partially delimit a common inner space (18) on the circumferential side, characterized in that the inner space (18) which can be assigned to the output-side part (14) is delimited by two fitting surfaces (20, 22) which receive an internal thread (24) between them, which separates the two fitting surfaces (20, 22) from one another.

2. Coupling device according to claim 1, characterized in that the one fitting surface (20) facing away from the drive-side part (12) is selected to be larger in diameter than the diameter of the further fitting surface (22) facing the drive-side part (12).

3. Coupling device according to claim 1 or 2, characterized in that the connecting part (16) is reduced or enlarged in diameter on the outer circumference side compared to the drive (12) and driven side part (14), whose outer diameters are substantially the same or different from one another.

4. Coupling device according to one of the preceding claims, characterized in that the length of the connecting part (16) corresponds substantially to the length of the output-side part (14).

5. Coupling device according to one of the preceding claims, characterized in that the drive-side part (12) has a tooth head (26) on the outer circumference or is formed from a flat piece (64).

6. Coupling device according to one of the preceding claims, characterized in that the internal thread (24) opens in the direction of the drive-side part (12) into an outlet (30) whose diameter lies between the diameters of the two fitting surfaces (20, 22).

7. Coupling device according to one of the preceding claims, characterized in that the two fitting surfaces (20, 22) are arranged coaxially to a drive axis (40) of the coupling device, the axial length of which, viewed parallel to the drive axis (40), essentially correspond to one another.

8. Coupling device according to one of the preceding claims, characterized in that, within the scope of the assembly standardization, the fitting surfaces (20, 22) each lie within a tolerance field with a difference of 0.008 mm.

9. Coupling device according to one of the preceding claims, characterized in that in the event that the drive-side part (12) has a tooth head (26), the associated part of the interior (18) has a further internal thread (48).

10. System, consisting of a coupling device according to one of the preceding claims, with a connectable spindle drive and with a connection geometry adapted to the coupling device, consisting of two counter fitting surfaces (50, 52) and an external thread (36) of the connectable Spindle drive in the form of a tool spindle (10).

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