Adapter for a gear motor, and gear motor

Abstract

The invention relates to an adapter for a gear motor. The adapter has a hollow adapter shaft and a hollow shaft. A clamping ring is plugged onto the hollow shaft, and a shaft can be inserted into the hollow shaft. The hollow shaft has a collar which projects radially from the hollow shaft and to which a bellows is connected in a bonded manner. The hollow shaft has a first region in which the hollow shaft has a first internal diameter, and the hollow shaft has a second region axially in front of the first region and a third region axially behind the first region, said hollow shaft having a respective second internal diameter which is smaller than the first internal diameter in the second region and in the third region. The region covered by the collar in the axial direction is axially spaced from the second and the third region.

Description

[0001] Adapter for a gear motor and a gear motor

[0002] Description:

[0003] The invention relates to an adapter for a gear motor and a gear motor.

[0004] It is generally known that a geared motor comprises an electric motor whose rotor shaft drives an input gear part of a gearbox.

[0005] A geared motor is known from DE 10 2020 003 340 A1.

[0006] DE 103 16 155 A1 discloses a series of shafts and a method for manufacturing them.

[0007] The invention is therefore based on the object of developing a geared motor, wherein the geared motor is to be robust against production-related deformations.

[0008] According to the invention, the object is achieved with the adapter according to the features specified in claim 1 and with the gear motor according to the features specified in claim 15.

[0009] Important features of the invention in the adapter for geared motors are that the adapter has a hollow adapter shaft and a hollow shaft, wherein a clamping ring is placed on the hollow shaft and a shaft can be inserted into the hollow shaft, in particular wherein the hollow shaft can be clamped, in particular shrunk, onto the shaft by means of the clamping ring. wherein the hollow shaft has a collar projecting radially from the hollow shaft, to which a bellows is integrally connected, in particular welded and / or welded, the hollow shaft has a first region in which it has a first inner diameter, in particular a clear diameter, wherein the hollow shaft has a second region axially in front of the first region and a third region axially behind the first region, in particular for precisely receiving and aligning the shaft, in which the hollow shaft has a second inner diameter,which is smaller than the first inner diameter, in particular wherein the axial direction is aligned parallel to the direction of the axis of rotation of the hollow shaft, wherein the region covered by the collar in the axial direction is axially spaced from the second and third regions, in particular wherein the region covered by the second region in the axial direction is spaced from the region covered by the collar in the axial direction, in particular wherein the region covered by the third region in the axial direction is spaced from the region covered by the collar in the axial direction.

[0010] The advantage here is that the adapter comprises a bellows coupling, i.e. the adapter shaft is connected to the hollow shaft by means of a materially bonded bellows. The heat flow introduced into the hollow shaft during welding, in particular into the collar of the hollow shaft, does cause a deformation of the hollow shaft; however, this deformation does not impair the clamping connection between the hollow shaft and the shaft, in particular the input rotor shaft of the electric motor. This is because an appropriately dimensioned axial distance between the collar and the clamping area of ​​the force-fit connection can be maintained. For this purpose, the clamping ring has an inner step such that its clear inner diameter decreases monotonously, in particular in a step-like manner, with increasing distance from the collar, whereby the outer diameter of the hollow shaft remains constant in the area covered by the clamping ring in the axial direction.

[0011] In an advantageous embodiment, the area covered by the collar in the axial direction is arranged within the area covered by the first area in the axial direction. This is advantageous because the collar is arranged in the wider inner area of ​​the hollow shaft, thus preventing deformation of the hollow shaft caused by the heat flow during welding from affecting the clamping area.

[0012] In an advantageous embodiment, the adapter shaft has a stepped bore into which the correspondingly stepped hollow shaft is inserted. This is advantageous because the hollow shaft is aligned with the adapter shaft with high precision.

[0013] In an advantageous embodiment, a sealing ring is arranged axially between the step of the stepped bore and the step of the hollow shaft. This allows for improved compensation of misalignment.

[0014] In an advantageous embodiment, the sealing ring is arranged radially between the hollow shaft and the adapter shaft. This allows for improved compensation of misalignment between the adapter shaft and the hollow shaft.

[0015] In an advantageous embodiment, the sealing ring is placed onto the hollow shaft. This allows for simple manufacturing. In particular, the sealing ring is elastically deformed when the hollow shaft is inserted into the adapter shaft.

[0016] In an advantageous embodiment, the collar is chamfered in such a way that the outer diameter of the collar decreases monotonically with decreasing distance from the clamping ring. This is advantageous because the contact area with the clamping ring is reduced. Furthermore, deformation of the collar in the area of ​​the chamfer does not affect the axial position of the clamping ring resting against the collar, since there is sufficient distance between the chamfer and the clamping ring.

[0017] In an advantageous embodiment, the hollow shaft has an axially extending slot, in particular an axial slot, which opens into the environment in particular at the end of the hollow shaft facing away from the adapter shaft. The advantage here is that when the clamping ring is actuated and thus shrunk on, the hollow shaft has sufficient elasticity and can therefore be shrunk onto the shaft, in particular thus achieving a force-fitting connection between the hollow shaft and the shaft inserted into the hollow shaft. In an advantageous embodiment, the hollow shaft has a longitudinal groove on its inner side which opens into the slot, in particular an axial slot, and extends in the axial direction from the slot to the end of the hollow shaft facing the adapter shaft, in particular wherein the area covered by the longitudinal groove in the axial direction comprises the area covered by the second area in the axial direction.The advantage here is that ventilation is provided, which particularly simplifies the insertion of the shaft into the hollow shaft.

[0018] In particular, the hollow shaft and the adapter shaft, in particular the axis of rotation of the hollow shaft and the axis of rotation of the adapter shaft, are coaxially aligned with each other.

[0019] In an advantageous embodiment, the adapter shaft has a radially protruding collar region to which the bellows is integrally bonded, in particular welded and / or welded. It is advantageous that the bellows can be arranged between the collar and the collar region, in particular with the connecting surface between the collar and the bellows being a flat surface arranged at a single axial position. Likewise, the connecting surface between the collar region and the bellows is a flat surface arranged at a single axial position.

[0020] In an advantageous embodiment, the collar area is tapered such that the outer diameter of the collar area increases monotonically with decreasing distance from the clamping ring. This has the advantage of reducing the contact area with the adjacent bearing mounted on the adapter shaft, thus preventing thermally induced deformation from affecting the axial position of the bearing.

[0021] In an advantageous embodiment, the adapter shaft has a bearing seat that is axially limited by the collar area. The advantage here is that the collar area not only performs the function of securing the bellows but also serves as an axial limit.

[0022] In an advantageous embodiment, the contact area between the clamping ring and the hollow shaft is axially spaced from the collar, in particular, wherein the clear inner diameter of the clamping ring is smaller in the contact area than in the axial area located between the area covered by the contact area in the axial direction and the area covered by the collar in the axial direction, in particular, wherein the clamping ring bears against the collar. The advantage here is that the heat flow entering the collar when the bellows is welded to the collar does not impair the clamping area, since thermally induced irreversible deformations of the hollow shaft are axially spaced from the clamping area.

[0023] In an advantageous embodiment, the shaft is the rotor shaft of the electric motor and at the end region of the adapter shaft facing away from the rotor shaft, a sun gear of the transmission having a running toothing and a plug-in toothing is inserted with its plug-in toothing into the adapter shaft.

[0024] The advantage here is that the rotor shaft drives the sun gear and thus drives the gearbox and the sun gear is aligned coaxially to the rotor shaft by means of the adapter shaft and hollow shaft.

[0025] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0026] The invention will now be explained in more detail using schematic illustrations:

[0027] Figure 1 shows an adapter of a gear motor according to the invention in a sectional view.

[0028] Figure 2 shows an adapter shaft 1 and a hollow shaft 9 of the adapter connected to the adapter shaft 1 via a bellows 5 in an oblique view.

[0029] In Figure 3, the adapter shaft 1 together with the hollow shaft 9 is shown in a cut-away oblique view.

[0030] In Figure 4, in contrast to Figure 2, a clamping ring 6 is pushed onto the hollow shaft 9.

[0031] In Figure 5 the adapter is shown in a cut-away oblique view.

[0032] As shown in the figures, the adapter has an adapter shaft 1 which is hollow.

[0033] Thus, a sun gear of a planetary gear of the geared motor, which has a running toothing and a plug-in toothing arranged axially in front of the running toothing, can be inserted into the adapter shaft 1 with the plug-in toothing, wherein the plug-in toothing is cut into the material of the adapter shaft 1 and thus the sun gear is connected to the adapter shaft in a form-fitting, in particular rotationally fixed, manner.

[0034] The adapter shaft 1 has a stepped bore at its end region axially remote from the sun gear, into which a correspondingly stepped hollow shaft 9 is inserted.

[0035] A sealing ring 8 is arranged axially between the step on the outside of the hollow shaft 9 and the step of the adapter shaft 1. Axially in front of and axially behind the sealing ring 8, the hollow shaft 9 is received in the adapter shaft 1, preferably with a clearance fit or with a precise fit. The hollow shaft 9 has a collar 7 on its radially outer surface, projecting radially outward and extending continuously in the circumferential direction. The hollow shaft, including its collar 7, is formed in one piece, in particular as a single piece.

[0036] The adapter shaft 1 also has a radially outwardly projecting collar region 14, which extends continuously in the circumferential direction and axially defines a bearing seat onto which a bearing 3 of the adapter shaft is placed, which bearing is accommodated in an adapter housing 4. In particular, the inner ring of the bearing 3 is positioned against the collar region 14 of the adapter shaft 1.

[0037] A bellows 5 is integrally connected, in particular welded, to the collar region 14, which is also integrally connected, in particular welded, to the collar 7.

[0038] A clamping ring 6 is placed on the hollow shaft 9, which has a continuous slot through which a clamping screw 40 protrudes. By operating the clamping screw 40, the clamping ring is shrunk onto the hollow shaft.

[0039] The bellows 5 is arranged radially outside the sealing ring 8. The area covered by the bellows 5 in the axial direction includes the area covered by the sealing ring 8 in the axial direction.

[0040] The clamping ring 6 is positioned against the collar 7 and thus limited in the axial direction. The inner ring of the bearing 3 is limited by the collar area 14 in the opposite direction to the axial direction.

[0041] The hollow shaft 9 has a radially continuous axial slot 12, in particular which extends in the axial direction and is open to the environment at the axial end of the hollow shaft 9 facing away from the adapter shaft 1.

[0042] When shrinking the clamping ring 6, an elastic deformation of the hollow shaft 9 is thus possible.

[0043] The hollow shaft 9 is aligned coaxially with the adapter shaft 1. The hollow shaft 9 has a longitudinal groove 13, in particular a channel, on its inner side, which extends axially from the axial slot 12 to the end of the hollow shaft 9 facing the adapter shaft 1. The longitudinal groove 13 is therefore preferably aligned with the axial slot 12.

[0044] The longitudinal groove 13 has only a small groove depth because it functions as a ventilation channel.

[0045] Preferably, the longitudinal groove 13 is manufactured with the same tool that also produces the axial slot 12.

[0046] The clamping ring 6 is placed on the hollow shaft 9 and touches the hollow shaft in the clamping contact area 10. In particular, the shrinkage force generated by the clamping ring 6 is introduced into the hollow shaft 9 there.

[0047] The clamping ring 6 projects beyond the clamping contact area 10 in the axial direction towards the collar 7. Thus, the area covered by the clamping ring 6 in the axial direction contains the area covered by the clamping contact area 10 in the axial direction, which area is, however, axially spaced from the area covered by the collar 7 in the axial direction.

[0048] Thus, the clamping contact area 10 is axially spaced from the collar 7.

[0049] When welding the bellows 5 to the hollow shaft 9, a heat flow penetrates from the collar 7 into the remaining hollow shaft 9. Before a sufficiently large spread of the heat flow is achieved, deformations of the hollow shaft 9 can occur.

[0050] Therefore, the hollow region of the hollow shaft 9 has a first region 31 with a first clear inner diameter, which is arranged axially between two further regions (30, 32), each with a second clear inner diameter.

[0051] The first region 31 is arranged axially between the two further regions (30, 32). Preferably, the two further regions (30, 32) border the first region 31.

[0052] A shaft inserted into the hollow shaft 9, in particular the rotor shaft of the electric motor, is received with a precise fit in the two second regions (30, 32) and has radial play with respect to the first inner diameter of the first region 31. The first inner diameter is therefore larger than the second inner diameter.

[0053] The aforementioned information on the inner diameters refers to the hollow shaft 9 before the welded connection between bellows 5 and collar 7 is made. The aforementioned heat input during the welding process causes deformations that can cause a deviation from the first inner diameter in the first region 31, so that radially directed elevations can arise in the first region 31. The radial spacing between the hollow shaft 9 and the first region 31 is selected such that the elevations are smaller than the radial distance. Thus, the heat-induced radially inward elevations caused by the welding process are harmless within the radial clearance between the hollow shaft 9 and the shaft.

[0054] During the welding process, the clamping ring 6 is not yet pushed onto the hollow shaft 9.

[0055] The shaft is precisely accommodated and aligned in the two areas 30 and 32.

[0056] The area 32 preferably extends in the axial direction in the same way as the clamping contact area 10. Thus, the clamping force from the clamping ring 6 is introduced into the shaft as directly as possible via the hollow shaft 9 in the area 32.

[0057] The collar 7 is arranged axially between the bellows 5 and the clamping ring 6.

[0058] The area 30, like the area 32, is axially spaced from the collar 7.

[0059] The area covered by the further area 30 in the axial direction is arranged within the area covered by the bellows 5 in the axial direction.

[0060] The hollow shaft 9 has, in its stepped region, a first outer region having a first outer diameter, and a second outer region having a second outer diameter that is larger than the first outer diameter. The first outer region abuts a first region of the adapter shaft 1 having a first clear inner diameter, and the second outer region of the hollow shaft 9 abuts a second region of the adapter shaft having a second clear inner diameter, wherein the second clear inner diameter of the adapter shaft 1 is larger than the first clear inner diameter.

[0061] The sealing ring 8 is arranged axially between the step of the adapter shaft 1 and the step of the hollow shaft 9. The sealing ring 8 is dimensioned and arranged between the hollow shaft 9 and the adapter shaft 1 in such a way that it is elastically deformed. Due to its axial spacing from the collar 5 and the collar area 14, it is also protected from critically high temperatures.

[0062] The shaft preferably extends through the hollow shaft 9 into the adapter shaft 1. Although this adapter shaft 1 is completely hollow, the sun gear with its spline is inserted into the end of the adapter shaft facing away from the hollow shaft 9. Therefore, the longitudinal groove 13 dissipates excess pressure when the shaft is inserted into the slot 12 and thus into the environment.

[0063] The first region 31 is designed as an internal cylinder and has the clear first diameter, in particular the first inner diameter.

[0064] The second region 32 is designed as an internal cylinder and has the clear second diameter, in particular the second inner diameter.

[0065] The third region 30 is designed as an internal cylinder and also has the second clear diameter, in particular the second inner diameter, which is smaller than the first.

[0066] The collar 7 has a conical bevel, so that the outer diameter decreases, in particular decreases monotonically, with decreasing axial distance from the clamping ring 6. In this way, the bellows 5 can be connected to the largest possible end face of the collar 7. In further embodiments according to the invention, the bellows 5 is not welded, but is otherwise connected by a material bond, in particular by adhesive bonding.

[0067] List of reference symbols

[0068] 1 adapter shaft

[0069] 2 shaft seal

[0070] 3 camps

[0071] 4 adapter housings

[0072] 5 bellows

[0073] 6 clamping ring

[0074] 7 collars

[0075] 8 Sealing ring

[0076] 9 Hollow shaft

[0077] 10 Terminal contact area

[0078] 11 conical bevel

[0079] 12 axial slot

[0080] 13 Longitudinal groove, especially channel

[0081] 14 Collar area

[0082] 30 Area with second inner diameter

[0083] 31 Area with first inner diameter

[0084] 32 Area with second inner diameter

[0085] 40 clamping screw

Claims

Patent claims:

1. Adapter for a geared motor, wherein the adapter has a hollow adapter shaft and a hollow shaft, wherein a clamping ring is placed on the hollow shaft and a shaft can be inserted into the hollow shaft, in particular wherein the hollow shaft can be clamped onto the shaft by means of the clamping ring, in particular can be shrunk onto it, in particular wherein the shaft projects through the hollow shaft, in particular projects through the hollow shaft and projects at least partially into the adapter shaft, characterized in that the hollow shaft has a collar projecting radially on the hollow shaft, to which a bellows is integrally connected, in particular welded and / or welded, the hollow shaft has a first region in which it has a first inner diameter, in particular clear diameter, wherein the hollow shaft has a second region axially in front of the first region and a third region axially behind the first region,in particular for accurately receiving and aligning the shaft, in which the hollow shaft has a second inner diameter which is smaller than the first inner diameter, in particular wherein the shaft has a constant outer diameter in the area covered by the first, second and third area in the axial direction, in particular wherein the axial direction is aligned parallel to the direction of the axis of rotation of the hollow shaft, wherein the region covered by the collar in the axial direction is axially spaced from the second and third regions, in particular wherein the region covered by the second region in the axial direction is spaced from the region covered by the collar in the axial direction, in particular wherein the region covered by the third region in the axial direction is spaced from the region covered by the collar in the axial direction.

2. Adapter according to claim 1, characterized in that the area covered by the collar in the axial direction is arranged within the area covered by the first area in the axial direction.

3. Adapter according to one of the preceding claims, characterized in that the adapter shaft has a stepped bore into which the correspondingly stepped hollow shaft is inserted.

4. Adapter according to one of the preceding claims, characterized in that a sealing ring is arranged axially between the step of the stepped bore and the step of the hollow shaft.

5. Adapter according to one of the preceding claims, characterized in that the sealing ring is arranged radially between the hollow shaft and the adapter shaft.

6. Adapter according to one of the preceding claims, characterized in that the sealing ring is placed on the hollow shaft.

7. Adapter according to one of the preceding claims, characterized in that the collar is beveled in such a way that the outer diameter of the collar decreases monotonically with decreasing distance from the clamping ring.

8. Adapter according to one of the preceding claims, characterized in that the hollow shaft has an axially extending slot, in particular an axial slot, which opens into the environment in particular at the end of the hollow shaft facing away from the adapter shaft.

9. Adapter according to one of the preceding claims, characterized in that the hollow shaft has on its inner side a longitudinal groove which opens into the slot, in particular axial slot, and extends in the axial direction from the slot to the end of the hollow shaft facing the adapter shaft, in particular wherein the area covered by the longitudinal groove in the axial direction comprises the area covered by the second area in the axial direction.

10. Adapter according to one of the preceding claims, characterized in that the hollow shaft and the adapter shaft, in particular the axis of rotation of the hollow shaft and the axis of rotation of the adapter shaft, are aligned coaxially with each other.

11. Adapter according to one of the preceding claims, characterized in that the adapter shaft has a radially projecting collar region to which the bellows is integrally connected, in particular welded and / or welded.

12. Adapter according to one of the preceding claims, characterized in that the collar region is beveled in such a way that the outer diameter of the collar region increases monotonically with decreasing distance from the clamping ring.

13. Adapter according to one of the preceding claims, characterized in that the adapter shaft has a bearing seat which is axially delimited by the collar region.

14. Adapter according to one of the preceding claims, characterized in that the contact area between the clamping ring and the hollow shaft is axially spaced from the collar, in particular wherein the clear inner diameter of the clamping ring in the contact area is smaller than in the axial area arranged between the area covered by the contact area in the axial direction and the area covered by the collar in the axial direction. In particular wherein the clamping ring bears against the collar.

15. Geared motor with adapter according to one of the preceding claims, characterized in that the shaft is the rotor shaft of the electric motor and at the end region of the adapter shaft facing away from the rotor shaft, a sun gear of the gear having a running toothing and a plug-in toothing is inserted with its plug-in toothing into the adapter shaft.

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