TW201816299A - Clamping coupling device characterized in that the stop element is assembled in the opening of the receiving region, so that the clamping ring and the coupling shaft are at least fixed each other to be rotatable - Google Patents

Abstract

The present invention relates to a clamping coupling device which includes: a coupling shaft having an elastically deformable receiving region for receiving a second shaft; a clamping ring assembled at the periphery of the coupling shaft in the receiving region; at least one clamping screw bolt capable of being screwed into the clamping ring to clamp and fix the clamping ring onto the coupling shaft so as to narrow the receiving region; and a stop element arranged in the clamping ring for preventing the clamped screw bolt from being screwed off the clamping ring. Therefore, the stop element is assembled in the opening of the receiving region, so that the clamping ring and the coupling shaft are at least fixed each other to be rotatable. The present invention also relates to a planetary gear and a machine tool gear with aforementioned clamping coupling device.

Description

   Clamping coupler   

The invention relates to a clamping coupler, a switchable planetary gear and a two-stage machine tool gear, each of which has such a clamping coupler.

The two-stage machine tool gear in the planetary shape is known from the prior art. The example here is the gear of the applicant's construction series ZF-Duo Project 2K. Two planetary machine tool gears of this type are known from documents DE 199 17 673 A1, DE 103 48 755 A1 and DE 10 2015 100 169 B3.

Clamping couplers are also known, for example, from documents DE 10 2011 013 887 A1, DE 101 55 581 A1 and DE 10 2004 011 361 C5. This type of clamping coupler is also called a clamping hub. The clamping coupler has one or more stop elements that prevent a clamping ring from rotating relative to a coupling shaft, and / or the clamping coupler has a stopper in the clamping ring for a clamp. Tight bolts are used, and the stopper prevents the clamping bolt from rotating out of the clamping ring. With the stopper, the clamping ring can also be expanded elastically, making the installation of the clamping coupler easier.

The object of the present invention is to improve the above-mentioned prior art, and this object is achieved by the characteristics of the main claim item, and the preferred implementation form can be inferred from the attached claim item.

An object of the present invention is to provide a clamping coupler, comprising: a coupling shaft having an accommodating area capable of being elastically deformed to accommodate a second shaft; and a clamping ring assembled in the accommodating area. The periphery of the coupling shaft; at least one clamping bolt that can be bolted into the clamping ring to clamp it on the coupling shaft and thus narrow the receiving area; and a stop element that Must be arranged in the clamping ring to prevent the clamping bolt from rotating out of the clamping ring.

In addition, the invention is characterized in that the stop element is assembled in the opening of the accommodating area, so that the clamping ring and the coupling shaft can be fixed and rotated with each other. The relative rotation between the clamping ring and the coupling shaft has thus been prevented. In this way, the stop element has a follow-up function, and when the clamping bolt is rotated out, the required loss protection and stop functions are required; The required rotation protection on this coupling axis / receiving area.

The stop element can be positioned in the opening of the receiving area of the coupling shaft at least in the surrounding direction. The aforementioned positioning method can be a card insertion and assembly method, which prevents relative rotation between the clamping ring and the coupling shaft. In this way, the clamping coupler can achieve a simple balance, because the clamping ring and the coupling shaft are fixedly arranged with each other in the rotation direction, and the stop element and the opening of the receiving area are inserted into the card and assembled The interconnections can also extend in the axial direction.

The clamping ring is formed in particular by a ring with radial slits, which just has a clamping bolt. The clamping bolt is connected to a clamping surface of the ring on two sides of the clamping slit. By the clamping of the clamping bolt, the ring can be elastically narrowed to apply the required clamping force to the receiving area of the coupling shaft. After the slits of the clamping ring are narrowed, the slit surfaces can move or even close to each other. By the rotation of the stop element and abutment, the clamping ring can be elastically enlarged. The slits of the clamping ring are thus enlarged and the slit faces are moved away from each other.

In addition, the clamping ring can also be formed by two or more ring sections, each ring section being connected to a clamping bolt, respectively. In this case, a plurality of the stop elements can be provided, especially one for each clamping bolt.

The so-called "radial" or "radial middle" currently refers in particular to a directional axis (middle) which is positioned at right angles to the rotation axis of the clamping coupler, in particular the coupling shaft, and the The rotation axes intersect. The rotating shaft can simultaneously form a longitudinal axis of the clamping coupler. In contrast, "longitudinal direction" or "longitudinal direction" means in particular a directional axis (center), which is positioned parallel or coaxial to the rotation axis of the clamping coupler.

The stop element is formed in particular as a single part. The stop element projects in particular in the radial direction via the clamping ring and projects inwardly into the opening of the receiving area. The stop element can in particular be screwed into the clamping ring. The clamping ring then has a thread, for example an internal thread, and the stop element has a thread corresponding to the internal thread, for example an external thread. The openings in the receiving area are in particular not provided with threads or without other radial fixings for the stop element.

The stop element is in particular a bolt. The stop element can have a flat or cast head, such as a hexagonal head. The diameter of the shaft of the stop element can be smaller than the diameter of the shaft of the clamping bolt.

The thread of the stop element can extend over only a portion of the total length of the shaft of the stop element. In particular, no thread can be provided in the part of the stop element which protrudes or should protrude in the opening of the receiving area. The part is formed particularly smoothly, for example, into a cylindrical or conical shape. Therefore, the stop element is not fixed in the opening in the radial direction. The stop element is thus formed so as to be able to move into the opening in the radial direction, ie the stop element is not fixed in the radial direction by the opening or the receiving area.

The stop element can of course also be formed as a pressure pin or a spring pin and pressed into the clamping ring.

The receiving area of the coupling shaft can have a drilled hole to receive the second shaft. The coupling shaft can therefore be inserted on the second shaft using the receiving area. The receiving area can dominate the slit, for example. This contributes to the flexibility of the receiving area. The receiving area can, for example, control a longitudinal slit or a slit in the form of a bolt / a slit extending transversely to the longitudinal direction. The longitudinal slits extend in the longitudinal direction of the coupling shaft, and the other slits extend transversely to the longitudinal direction. The plurality of slits can be opened toward the front side of the coupling shaft, that is, open to the front side. A plurality of slits can also be formed in the form of long holes. The plurality of slits can be opened toward the front, and the other slits can be formed as long holes.

The stop element is assembled in an opening in the accommodating area, and the opening can be a special opening of the stop element. The opening can therefore only be used for intrusion of the stop element. The size of the opening is therefore adjusted precisely according to the stop element. The opening can be a drilled hole, such as a channel or pocket hole. The opening can also be formed by an opening already existing in the receiving area. In addition, the opening can be formed by a slit in the accommodating area that provides elasticity of the accommodating area.

It is also suggested that a switchable planetary gear governs the gear housing with the drive shaft rotatably arranged in the gear housing and the driven shaft rotatably arranged in the gear housing, the drive shaft being at least rotatably connected with a The sun gear is connected, and the driven shaft is at least rotatably connected to a planet carrier.

This includes: the drive shaft can be fixedly connected to the sun gear, or the drive shaft and the sun gear can be formed in a single piece, so that a common component can be formed. This also includes that the driven shaft can be fixedly connected to the planetary carrier, or the driven shaft and the planetary carrier can be formed in a single piece, that is, they can form a common component.

The proposed planetary gear additionally has a hollow gear, which is set in particular in the gear housing to be rotatable. The planetary gear additionally governs a sleeve capable of moving at least in the first and second switching positions. The sleeve can rotatably connect the hollow gear with the gear housing in a first switching position, and the sleeve can rotatably connect the hollow gear with the drive shaft in a second switching position.

In the first switching position, the hollow gear is thus fixedly connected to the gear housing during rotation, and it can therefore no longer rotate relative to the gear housing. Therefore, the rotational momentum of the hollow gear can be supported on the casing. In this first switching position, the gear has a transmission ratio (i ≠ 1) that is not equal to one.

In the second switching position, the hollow gear is connected to the drive shaft when rotating. Since the drive shaft is connected with the hollow gear and the sun gear during rotation, the planetary gear is blocked. The hollow gear, the sun gear and the planetary carrier can then continuously rotate only in the same direction with the same number of revolutions. In the second switching position, the gear therefore has a transmission ratio (i = 1) equal to one.

Finally, the proposed planetary gear also has the proposed clamping coupler. Therefore, the driving shaft of the planetary gear forms the coupling shaft of the clamping coupler. The drive shaft thus governs the receiving area, on which a clamping ring, the clamping bolt and the stop element are arranged.

Basically, a suggested clamping coupler can also be provided for the planetary gear follower in addition or in another way. Therefore, the driven shaft forms the coupling shaft of the clamping coupler.

The receiving area of the coupling shaft is in particular for receiving a drive motor shaft (for example, an electric (E) -mechanical) drive motor shaft. The drive motor shaft is therefore in particular a rotor shaft of the electromechanical device.

The gear housing of the planetary gear can thus form a flange to mount (eg, latch) the electro-mechanical. The gear housing can govern one or more openings through which the clamping bolts of the clamping coupler can be grasped. Therefore, the clamping bolt can be bolted into the clamping ring from the outside of the gear housing. In particular, the opening must be provided so that when the electro-mechanical device is disposed on the gear housing and the rotor shaft is disposed in the receiving area of the driving shaft / coupling shaft, the opening can achieve a grasping function.

The gear housing preferentially governs a sealed internal space. A sleeve, a hollow gear, a sun gear, a planetary gear and a planetary carrier are arranged inside the internal space. This internal space is preferably filled with a lubricating material. The drive shaft / coupling shaft protrudes from the sealed internal space. Here, a shaft washer is arranged between the drive shaft / coupling shaft and the gear housing, for example, a radial shaft seal ring. The design here is that the receiving area is arranged outside the sealing area and has a clamping bolt. Therefore, the gear housing can be filled with a lubricant in advance. The drive motor can be arranged on the gear housing without additional filling measures later. The drive shaft / coupling shaft is therefore sealed by the shaft washer. The gasket can be positioned directly adjacent to the receiving area.

The sleeve of the planetary gear includes a mechanical fastener that holds a sleeve in a first switching position and / or a second switching position. The fastener produces a retaining force. In the present case, the holding force acts directly on the sleeve, which holds the sleeve in the respective switching position. When the holding force is too large, the sleeve can be moved out of the respective switching position. The movement of the sleeve to the switching position is preferably achieved by an actuator, or by an actuator of an electric motor or an electromagnetic actuator.

The sleeve can be constructed so that it can only be moved to the second switching position. Another way is that the sleeve can still be moved to an idle position, which serves as the third switching position. In this idling position, the hollow gear can rotate freely in the gear housing, so that the planetary gear can be idled. The sleeve can have a mechanical fastener that keeps the sleeve in the idle position. Therefore, parts of the fastener, especially elastic pressure fittings, can be protected in the first or second switching position.

A two-stage machine tool gear is also proposed, which is based on the proposed planetary gear.

This machine tool gear is used in a machine tool and transfers the rotational momentum and speed provided by the drive motor to the mandrel of the machine tool. The mandrel can carry, for example, a tool or a workpiece for processing. The machine tool is, for example, a rotary machine or a milling or grinding machine or a corresponding machining center.

The machine tool gear is formed precisely in a two-stage form. Therefore, it happens to have two gear ratio conversion stages. The gear ratio in the gear ratio conversion stage can be, for example, i = 5 (the first gear ratio conversion stage; the first switching position of the sleeve) and i = 1 (the second gear ratio conversion stage; the second sleeve switching position).

The present invention will be described in detail below based on the drawings, so that other preferred implementation forms and features of the present invention can be inferred. Therefore, each figure is shown as a schematic diagram, respectively.

[Learning]

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〔this invention〕

1‧‧‧drive shaft, coupling shaft

1A‧‧‧accommodation area

1B‧‧‧Coupling

2‧‧‧ driven shaft

3‧‧‧ Rolling bearings

4‧‧‧ Gear housing

4A‧‧‧bearing cap

4B‧‧‧Coupling

5‧‧‧ Rolling bearings

6‧‧‧ sun gear

7‧‧‧ planetary gear

8‧‧‧ planet carrier

8A‧‧‧ planetary bolt

9‧‧‧ hollow gear

9A‧‧‧Head

9B‧‧‧Coupling

10‧‧‧ Rolling bearings

11‧‧‧ sleeve

11A‧‧‧Coupling

11B‧‧‧Second coupling

11C‧‧‧Guide

12‧‧‧Drive element

12A‧‧‧ Invasion

13‧‧‧Guide Pin

14‧‧‧Actuator

15‧‧‧Fastener

15A‧‧‧ Elastic pressure piece

15B, 15C‧‧‧Groove

16‧‧‧ clamping coupler

17‧‧‧ slit

18‧‧‧ clamping ring

18A‧‧‧Clamping ring slit

19‧‧‧ clamping bolt

20‧‧‧ Stop element

21‧‧‧ opening

22‧‧‧ Stop

23‧‧‧ weight zone

24‧‧‧Container

L‧‧‧rotation axis / vertical axis

Z‧‧‧ area

Figure 1 is a two-stage planetary gear; Figure 1A is a section of Figure 1; Figure 2 is a clamping coupler; and Figure 3 is an exploded view of the clamping coupler in Figure 2.

Identical or at least functionally identical components or elements in each figure are provided with the same reference symbols.

Please refer to Figure 1, a two-stage planetary gear, especially a machine tool gear. The planetary gear governs a drive shaft 1 to introduce rotational momentum into the gear, and the planetary gear governs a driven shaft 2 to derive rotational momentum from the gear. The drive shaft 1 is positioned in a gear housing 4 by at least one rolling bearing 3. The driven shaft 2 is positioned in the gear housing 4 by at least one rolling bearing 5. The driven shaft 2 is positioned coaxially with the driving shaft 1.

The drive shaft 1 forms part of a clamping coupler 16 which will be described in detail in FIGS. 2 and 3 and the related description. The drive shaft 1 forms a coupling shaft 1 of the clamping coupler 16. The drive shaft 1 can therefore also be called a coupling shaft 1.

Please refer to FIG. 1, the driving shaft 1 is used for the rolling bearing 3 and is arranged on a bearing cover 4A, which is a part of the gear housing 4, and the bearing cover 4A forms a The flange can mount a driving motor (for example, an electric motor) on the gear housing 4. In addition, the bearing cover 4A faces the driving motor to seal the internal space of the gear housing 4, and the driving shaft 1 has an accommodation area 1A for the rotor shaft of the driving motor, and the rotor shaft can be inserted into the accommodation In the zone 1A, the clamping coupler 16 is used for: the rotor shaft of the driving motor can be fixedly connected to the driving shaft 1 and can be rotated through clamping.

Please refer to FIG. 1 again, the driving shaft 1 is fixedly connected to at least one sun gear 6 and can be rotated, for example, the card is inserted and assembled, and the driving shaft 1 and the sun gear 6 can also be connected to each other. The single pieces are formed together, for example, integrally formed or connected to each other by bonding or welding. The sun gear 6 is connected to a plurality of planetary gears 7 in a gear shape. The planetary gear 7 is also rotatably disposed on a planetary carrier 8. The planetary gear 7 is rotatably located on a planetary bolt 8A of a planetary carrier 8, and the planetary carrier 8 is fixedly connected to at least a driven shaft 2 so as to be rotatable, so as to be connected to each other by a card or an assembly method. In addition, the driven shaft 2 and the planetary carrier 8 can also be constituted together in a single piece, for example, integrally formed or connected to each other in a bonding or welding manner. The planetary carrier 8 is currently rotatably positioned in the gear housing 4 via the rolling bearing 5 of the driven shaft 2.

Please refer to FIG. 1, the planetary gear 7 is connected with the hollow gear 9 of the planetary gear 7 in a gear shape. The hollow gear 9 is rotatably positioned in the gear housing 4 via at least one rolling bearing 10. The hollow gear 9 controls the front head 9A, and a coupling member 9B is provided on the head 9A. The coupling member 9B enables the hollow gear 9 to be movably fixedly connected to the sleeve 11 and can rotate. Therefore, the sleeve 11 dominates a corresponding coupling member 11A, and is connected to the coupling member 9B in a card insertion and assembly manner.

Please refer to FIG. 1 again, the sleeve 11 is coaxial and positioned with the driving shaft 1. The sleeve 11 can also be called a switching sleeve, which can switch the gear stage of the planetary gear 7. The sleeve 11 can be moved in at least a first switching position and a second switching position, and can be moved in each of the first and second switching positions. The sleeve 11 communicates with the via the coupling members 9B, 11A. The hollow gear 9 is rotatably connected.

Taken on, in the planetary gear 7, wherein the sleeve 11 is disposed in the second switching position, through the coupling members 9B, 11A and the coupling member 1B of the drive shaft 1, the sleeve 11 The hollow gear 9 is rotatably connected to the drive shaft 1. Therefore, in the first switching position (not shown), the sleeve 11 allows the hollow gear 9 to be rotatably connected to the gear housing 4. Therefore, the sleeve 11 has the second coupling member 11B, and the second coupling member 11B can work with the coupling member 4B corresponding to the gear housing 4 in the first switching position, and the sleeve 11 faces The second switching position moves in the direction of the driven shaft 2.

FIG. 1A shows the area Z marked in FIG. 1 in an enlarged view. Each of these coupling members 1B, 4B, 11A, 11B can be seen well in this figure.

Please refer to FIG. 1A, in the first switching position of the sleeve 11, the sleeve 11 is rotatably decoupled by the driving shaft 1. Each of these coupling members 1B, 11A therefore does not interact. The driving shaft 1 is rotatable relative to the sleeve 11 fixed to the gear housing 4.

In the second switching position of the sleeve 11 (see FIG. 1), the sleeve 11 is rotatably decoupled by the gear housing 4. Each of these coupling members 4B, 11B therefore does not interact. The sleeve 11 can thus be rotated together with the drive shaft 1 relative to the fixed gear housing 4.

Please refer to FIG. 1A again, the sleeve 11 is provided with an idle position as a third switching position, wherein the sleeve 11 and the hollow gear 9 are neither connected to the drive shaft 1 nor to the gear housing 4 can be connected rotatably. Therefore, the planetary gear is idling. The third switching position can be a center position of the sleeve 11, which is located between each of the first and second switching positions. In addition, the sleeve 11 is currently moved to the switching position by a driving element 12. The driving element 12 is, for example, a switching fork. The driving element 12 intrudes into the guide groove 11C of the sleeve 11 with an intruding portion 12A. Therefore, the movement of the driving element 12 can be transferred to the rotatable sleeve 11. The guide groove 11C and the intruding portion 12A form a rotary coupler.

The driving element 12 is moved by an actuator 14 set on the gear housing 4. Therefore, a suitable way is that it involves an electromagnetic or an electric actuator 14. Alternatively, a hand lever or the like can be provided to manually move the driving element 12.

Please refer to FIG. 1A, the sleeve 11 has a mechanical fastener 15 that holds the sleeve 11 at each of the first and second switching positions, and can also choose to maintain the sleeve 11 at the third switching position. This fastener is currently formed on the one hand by the elastic pressure member 15A in the hollow gear 9 and on the other hand by the sleeve 11 corresponding to the pressure member 15A and used for the first switching position. A groove 15B and a second groove 15C corresponding to the pressure member 15A in the sleeve 11 for the second switching position are formed (see FIG. 1A). For the third switching position, a third groove positioned between each of the first and second grooves 15B, 15C can still be provided, and the fastener 15 causes a holding force to act on each of the switching positions. In order to move the sleeve 11 to another switching position on the sleeve 11, the holding force must be overcome.

Figures 2 and 3 show the clamping coupler used in the planetary gear of Figure 1, Figure 2 shows the clamping coupler in the assembled state, and Figure 3 shows the clamping Exploded view of coupler.

Please refer to FIG. 3, in the planetary gear, the driving shaft 1 simultaneously forms a coupling shaft of the clamping coupler. The rotation axis / longitudinal axis of the clamping coupler, in detail, is the coupling axis / driving shaft 1 of the clamping coupler, which is indicated by a reference symbol L.

In FIG. 1, the drive shaft / coupling shaft 1 having the receiving area 1A protrudes from the sealed internal space of the gear housing 4. The receiving area 1A, the clamping ring 18 and a clamping bolt 19 of the clamping coupler 16 are located outside the sealed internal space.

The usability of the clamp coupler 16 shown in FIGS. 2 and 3 is not limited to a planetary gear or a machine tool. Instead, the clamping coupler 16 can be used for every shaft-shaft- or shaft-hub-connection.

Briefly described above, the receiving area 1A of the coupling shaft / drive shaft 1 is used for another shaft to be connected to the coupling shaft / drive shaft 1, for example, an electro-mechanical rotor shaft.

Please refer to FIGS. 1 and 2, the receiving area 1A is currently formed by a drilled hole in the coupling shaft / drive shaft 1. This borehole in particular forms a channel borehole. This channel bore can be sealed by a closure, such as a plug. Therefore, for example, the lubricant cannot flow through the coupling shaft / drive shaft 1, and the receiving area 1A is formed with a thin wall surface, and the receiving area 1A further has a slit 17 distributed on the coupling shaft / drive Around the shaft 1, the slit 17 leads to the front side of the coupling shaft / drive shaft 1. By the slit 17, the coupling shaft / drive shaft 1 can be easily in the receiving area 1A, elastically in the diameter. Deformed in the middle, the slit thus contributes significantly to the elastic deformation of the receiving area 1A.

A clamping ring 18 is provided on the receiving area 1A, and the receiving area 1A is assembled in the surrounding direction of the coupling shaft / drive shaft 1. The clamping ring 18 has a radial clamping ring slit 18A. By the clamping ring slit 18A, the clamping ring can be enlarged and narrowed in a peripheral direction. In addition, the clamping ring 18 can have a weight area 23 on which the clamping coupler can be balanced. The receiving area 1A can have a stop 22 or a collar as an axial stop for the clamping ring 18.

Please refer to FIG. 1 and FIG. 2 again, a clamping bolt 19 is bolted into the clamping ring 18. The clamping bolt 19 is connected to a slit surface of the clamping ring 18 formed by the clamping ring slit 18A. By clamping the clamping bolt 19, the clamping ring slit 18A can be elastically narrowed. The clamping ring is then clamped on the receiving area 1A, which causes the receiving area 1A to elastically narrow in the radial direction. Then, a second shaft arranged in the receiving area 1A is fixedly clamped. The second shaft is interconnected with the coupling shaft / drive shaft 1 by a card or an assembly method.

Please refer to FIGS. 1 and 2, a stop element 20 is provided in the region of the head of the clamping bolt 19. The stop element 20 is formed by a bolt, and the stop element 20 is bolted to the clamp. Ring 18. In contrast, the clamping ring 18 and the stop element 20 thus dictate corresponding threads.

It is supported that the stopper element 20 forms a kind of loss protection for the clamping bolt 19. When the clamping bolt 19 is rotated out of the clamping ring 18, the head of the clamping bolt 19 is fixed by the stopper element 20. Stopped, unable to leave and positioned on the stop element 20, and also prevented the clamping bolt 19 from falling out of the clamping ring 18, and by the clamping bolt 19 continuing to rotate, the clamping ring 18 The additional enlargement makes the clamping ring 18 easier to install.

Referring to FIG. 3, the stopper element 20 passes through the clamping ring 18 and penetrates into the opening 21 of the coupling shaft / drive shaft 1 in the receiving area 1A, so that the coupling shaft / drive shaft 1 and the The clamping rings 18 are at least fixed to each other and can rotate. The opening 21 can be a dedicated opening of the stop element 20. Therefore, the stopper element 20 can also prevent the clamping ring 18 from falling in the axial direction, that is, falling along the rotation axis L. Alternatively, one of the plurality of slits 17 can be used as the opening 21. In addition, the clamping ring 18 is no longer fixed by the stop element 20 in the axial direction, and the stop element 20 itself is not fixed in the opening 21 in the radial direction, that is, the stop element 20 itself Can be inserted into this opening 21. Furthermore, the stop element 20 is fixed in the radial direction by the clamping ring 18.

According to the above description, the stop element 20 can protect the function of the clamping bolt 19 from being lost, and the function of the rotation protection and the protection of the clamping ring 18 from being lost.

The coupling shaft / drive shaft 1 now has a receptacle 24 in its front side remote from the clamping ring 18. The receiving member 24 is used to fix the sun gear 6 there in the embodiment of FIG. 1.

Claims (10)

    A clamping coupler includes: a coupling shaft having an elastically deformable receiving area to accommodate a second shaft; a clamping ring assembled in the receiving area around the coupling shaft; at least one clip A tightening bolt which can be bolted into the clamping ring to clamp it on the coupling shaft and thus narrow the receiving area; and a stop element which must be arranged in the clamping ring To prevent the clamping bolt from rotating out of the clamping ring; the feature of this creation is that the stop element is assembled in the opening of the accommodating area so that the clamping ring and the coupling shaft can be fixed and rotated with each other.         The clamping coupler according to claim 1, wherein the stop element is assembled in the opening of the receiving area, so that the clamping ring and the coupling shaft are also fixed to each other in the axial direction.         The clamping coupler according to claim 2, wherein the stop element projects into the opening of the receiving area via a radial direction of the clamping ring.         The clamping coupler according to claim 3, wherein the stop element can be bolted into the opening of the receiving area.         The clamping coupler according to claim 4, wherein the stop element can be bolted into the clamping ring.         The clamping coupler according to claim 5, wherein the stop element is a bolt and its diameter is smaller than the diameter of the clamping bolt.         The clamping coupler according to any one of claims 1 to 6, wherein the stop element can be assembled into the opening of the accommodating area, and the appearance of the opening can be a hole shape dedicated to the stop element. Or, it can be a slit shape that makes the receiving area have elasticity.         A switchable planetary gear includes: a gear housing; a drive shaft rotatably arranged in the gear housing, and at least rotatably connected with a sun gear; a driven shaft capable of rotating It is grounded in a gear housing and is at least rotatably connected to a planetary carrier; a hollow gear; and a sleeve that is movable at least in a first switching position and a second switching position. In the state of the first switching position, it can rotatably connect the hollow gear with the gear housing, and in the state of the sleeve in the second switching position, it can rotatably connect the hollow gear with the drive. The shafts are connected; the feature of this creation is that a clamping coupler as in any one of claims 1 to 7 is provided, wherein the drive shaft system forms a coupling shaft of the clamping coupler.         The planetary gear of claim 8, wherein the gear housing has a sealed internal space, the drive shaft is protruded from the sealed internal space, and the receiving area is formed outside the sealed internal space, and has a receiving area thereon One clamping bolt.         A two-stage machine tool gear, characterized in that it has a planetary gear according to claim 8 or 9.