GEAR MOTOR HAVING A GEARING SYSTEM, AN ELECTRIC MOTOR, AND AN ADAPTER

Abstract

A gear motor includes a gearing system, an electric motor, and an adapter. The adapter is situated between the electric motor and the gearing system, the adapter has an adapter shaft, the adapter shaft is at least partially inserted into an input shaft of the gearing system, the adapter shaft is connected to the input shaft in a torsionally fixed manner with the aid of a bellows, and a sealing ring is situated between the adapter shaft and the input shaft.

Claims

1-15. (canceled)

16. A gear motor, comprising: a gearing system including an input shaft; an electric motor; an adapter arranged between the electric motor and the gearing system and including an adapter shaft at least partially inserted into the input shaft of the gearing system and connected to the input shaft of the gearing system in a torsionally fixed manner with the aid of a bellows; and a sealing ring arranged between the adapter shaft and the input shaft.

17. The gear motor according to claim 16, wherein the input shaft is integrally formed and/or formed as one part and/or the adapter shaft is integrally formed and/or formed as one part.

18. The gear motor according to claim 16, wherein the adapter shaft includes a step at an outer circumference, the input shaft has a stepped bore, and the sealing ring is arranged axially between the step of the adapter shaft and a step of the stepped bore.

19. The gear motor according to claim 18, wherein the sealing ring in particular is arranged on the adapter shaft.

20. The gear motor according to claim 18, wherein a region covered by the sealing ring in an axial direction and/or in a direction of an axis of rotation of the input shaft is encompassed by a region covered by the bellows in the axial direction.

21. The gear motor according to claim 16, wherein the adapter shaft has a hollow configuration, a motor shaft and/or a rotor of the electric motor is at least partially inserted into the adapter shaft, and a clamping ring is placed on the adapter shaft for a friction-locked connection of the adapter shaft to the motor shaft and/or the rotor.

22. The gear motor according to claim 16, wherein the bellows is welded to the adapter shaft and to the input shaft, the adapter shaft includes a radially protruding projection to which the bellows is connected by a weld, the input shaft including a radially protruding projection to which the bellows is connected by a weld.

23. The gear motor according to claim 16, wherein an outer ring of a bearing is accommodated in a flange part of the gearing system, an inner ring of the bearing is arranged on the input shaft, and the inner ring is positioned and/or pressed against a radially protruding projection arranged on the input shaft.

24. The gear motor according to claim 23, wherein the bearing is arranged as a roller bearing and/or a ball bearing, the flange part includes a bearing flange, a shaft sealing ring accommodated in the flange part seals against the input shaft, a sealing lip of the shaft sealing ring touches the input shaft, and the shaft sealing ring is arranged on a side of the bearing facing away from the bellows.

25. The gear motor according to claim 23, wherein the bearing is axially set apart from the bellows and is lubricated by grease.

26. The gear motor according to claim 16, wherein a region covered by the bellows in an axial direction encompasses a region covered by the sealing ring in the axial direction and encompasses a region between two steps covered in the axial direction.

27. The gear motor according to claim 16, wherein a radial clearance region covered by the bellows is set apart from a radial clearance region covered by the sealing ring.

28. The gear motor according to claim 16, wherein a region covered by the adapter shaft in an axial direction encompasses a region covered by the bellows in the axial direction.

29. The gear motor according to claim 16, wherein the sealing ring touches a step of the adapter shaft, a step of the input shaft, a wall of a stepped bore in the input shaft, and a cylindrical circumference of the adapter shaft.

30. The gear motor according to claim 16, wherein the sealing ring touches the input shaft at a front in an axial direction, the adapter shaft counter to the axial direction, the input shaft in a radially outward-facing direction, and the adapter shaft in a radially inward-facing direction.

31. The gear motor according to claim 23, wherein a housing part of the adapter is connected to the flange part and to a housing part of the gearing system, the housing part of the adapter is arranged between the housing part of the gearing system and the flange part, and the housing part of the adapter radially surrounds a clamping ring.

32. The gear motor according to claim 21, wherein the clamping ring includes an axially uninterrupted slot.

33. The gear motor according to claim 32, wherein a screws is arranged through the slot and is arranged as a tangentially directed screw that compresses the clamping ring to narrow the slot.

34. The gear motor according to claim 16, wherein a sun gear arranged as a pinion is arranged in the input shaft on a side facing axially away from the adapter shaft and connected to the input shaft in a torsionally fixed manner; and wherein (a) the input shaft is arranged as a hollow shaft and sealed with the aid of the sun gear against an interior space of the gearing system filled at least partially with oil or (b) the input shaft is arranged as a solid shaft.

35. The gear motor according to claim 34, wherein the sun gear meshes with planet wheels and/or planet gears.

36. The gear motor according to claim 34, wherein the sun gear includes a helical gearing that meshes with helical gearings of planet wheels and/or planet gears.

37. The gear motor according to claim 16, the sealing ring is arranged as an O-ring and/or is formed of an elastomer and/or rubber.

38. The gear motor according to claim 16, wherein the adapter shaft is arranged as a hollow adapter shaft, and the sealing ring is arranged between the hollow adapter shaft and the input shaft to seal a spatial region surrounded by the hollow adapter shaft against the input shaft, the spatial region surrounded by the hollow adapter shaft against the input shaft being connected to a spatial region accommodating the bellows via a gap that is provided between a motor shaft and the adapter shaft.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 illustrates the input region of a gearing system having an adapter included by a gear motor according to an example embodiment of the present invention.

[0026] FIG. 2 is a longitudinal cross-sectional view through the rotating part illustrated in FIG. 1.

[0027] FIG. 3 is an associated perspective view.

DETAILED DESCRIPTION

[0028] As schematically illustrated in the Figures, the gear motor according to an example embodiment of the present invention has an adapter, which is situated between a gearing system and an electric motor.

[0029] The Figures show only motor shaft 12, i.e., especially the rotor, of the electric motor. With the aid of two bearings, motor shaft 12 is mounted inside the housing of the electric motor. The bearing facing the gearing system is, for example, a floating bearing, and the bearing situated at a greater distance is a fixed bearing.

[0030] Motor shaft 12 is inserted into a hollow adapter shaft 8 of the adapter and connected by friction locking. To this end, a clamping ring 9 is placed on adapter shaft 8, which shrink-fits the adapter shaft to inserted motor shaft 12 by operating the tangentially oriented screw 30. Adapter shaft 5 is provided with an axially directed slot for this purpose.

[0031] Input shaft 5 is also hollow and connected to adapter shaft 8 with the aid of a bellows 11 in a torsionally fixed manner. Bellows 11 is situated radially outside adapter shaft 8 and also radially outside input shaft 5. In other words, the radial clearance region covered by bellows 11 is radially outside the radial clearance region jointly covered by adapter shaft 8 and input shaft 5 in the region covered by bellows 11 in the axial direction.

[0032] Adapter shaft 8 is partially inserted into input shaft 5 of the gearing system. Input shaft 5 is rotatably mounted with the aid of a bearing 3, e.g., a roller bearing, a ball bearing, etc., accommodated in flange part 2. The inner ring of bearing 3 is placed on shaft 5, and the outer ring of bearing 5 is accommodated in flange part 2.

[0033] A shaft sealing ring 4, which seals against input shaft 5, is accommodated in flange part 2 on the side of bearing 3 axially facing away from bellows 11.

[0034] In the axial direction, i.e., especially in the direction of the axis of rotation of adapter shaft 8, bellows 11 is situated between a projection 7 formed on adapter shaft 8 and a projection 6 formed on input shaft 5. Via its first axial end region, bellows 11 is welded to projection 7, and via its other axial end region it is welded to projection 6.

[0035] The connection surfaces between bellows 11 and the projections 6, 7 are, e.g., flat, and the normals of the planes are aligned in parallel with the axial direction in each case.

[0036] The radial clearance region covered by the projections 6, 7 in each case overlaps with the radial clearance region covered by bellows 11.

[0037] In the region covered by bellows 11 in the axial direction, adapter shaft 8 has a step at its radial outer side, and input shaft 5 has a step on its inner side viewed from the radial direction.

[0038] The two steps are set apart from each other in the axial direction so that a sealing ring 10, e.g., an O-ring, is disposed between the steps.

[0039] The respective radial extension of the steps, i.e., for example, the radial clearance region covered by the respective step, is smaller than the diameter of the cross-section of the sealing ring in its relaxed state and/or smaller than the radial clearance region covered by the sealing ring in its relaxed state.

[0040] When adapter shaft 8 is inserted into input shaft 5, the sealing ring centers adapter shaft 8 relative to input shaft 5. This is relevant because input shaft 5 accommodates only the inner ring of a single bearing.

[0041] Bellows 11 compensates for thermally induced changes in length of motor shaft 12.

[0042] At the end region of input shaft 5 facing away from motor shaft 12, a sun gear, which is arranged as a pinion, is inserted into the hollow opening of shaft 5 and connected in a torsionally fixed manner and also firmly connected to input shaft 5 in the axial direction.

[0043] The sun gear, and also the planet wheels meshing with the sun gear, for example, have helical gearings, e.g., so that in a rigid coupling of adapter shaft 8 with input shaft 5, the axial, thermally induced length changes of motor shaft 12 result in a position accuracy of the output shaft via the helical gearing at the output shaft.

[0044] Sealing ring 10 induces centering of adapter shaft 8 relative to input shaft 5 when adapter shaft 8 is inserted into input shaft 5. In addition, it limits the insertion in that the further insertion requires an increasing, extremely strong force. Due to this rise in force, the insertion is restricted and/or the end of the insertion recognizable.

[0045] The spatial region accommodating sealing ring 10 in the axial direction and in the radial direction is, for example, so small that sealing ring 10 touches both the step of adapter shaft 8 and the step of input shaft 5 and also the wall of the bore in input shaft 5 as well as the cylindrical circumference of adapter shaft 8. Sealing ring 10 thus touches the two shafts 5, 8 that restrict it both in an axial direction at the front and back and radially outside and inside.

[0046] The region covered by sealing ring 10 in the axial direction is encompassed by the region covered by bellows 11 in the axial direction.

[0047] Bellows 11 is set apart from bearing 3 in the axial direction, and the inner ring of bearing 3 is pressed and/or positioned against projection 6 formed on input shaft 5. On the side of projection 6 facing axially away from bearing 3, bellows 11 is connected by welding.

[0048] The outer diameter of bellows 11 has a wave-shaped characteristic in the axial direction. The wall thickness of bellows 11, for example, is constant. Bellows 11, for example, is made from sheet metal.

[0049] Adapter shaft 8 is axially set apart from bearing 3. The region covered by adapter shaft 8 in the axial direction is set apart from the region covered by bearing 3 in the axial direction.

[0050] The region covered by adapter shaft 8 in the axial direction encompasses the region covered by bearing 3 in the axial direction.

[0051] The region covered by input shaft 5 in the axial direction is set apart from projection 7 provided on adapter shaft 8 to which bellows 11 is connected by welding.

[0052] The bearing is, for example, lubricated by grease.

[0053] Sealing ring 4 arranged as a shaft sealing ring seals the interior spatial region of the gearing system which is at least partially filled with oil. Thus, bellows 11 is surrounded not by oil but by ambient air. No seal is required between bellows 11 and the interior space of the driving motor.

[0054] Sealing ring 10 is, for example, arranged as an O-ring and used for centering adapter shaft 8 inside input shaft 5. In addition, it prevents abrasion between input shaft 5 and adapter shaft 8. The extremely narrow gap between adapter shaft 8 and input shaft 5 prevents or restricts a tilting angle. For example, only a relative movement of adapter shaft 8 with respect to input shaft 5 in the axial direction is possible as a result.

LIST OF REFERENCE NUMERALS

[0055] 1 adapter housing part [0056] 2 flange part [0057] 3 bearing, e.g., roller bearing, ball bearing, etc. [0058] 4 sealing ring [0059] 5 input shaft [0060] 6 projection [0061] 7 projection [0062] 8 adapter shaft [0063] 9 clamping ring [0064] 10 sealing ring [0065] 11 bellows [0066] 12 motor shaft, e.g., rotor of the electric motor driving the gearing system [0067] 30 screw