Electric motor with housing, additionally comprising a brake

Abstract

The invention relates to a braking motor consisting of an electric motor (only stator winding 32 and rotor shaft 6 are shown) and a brake (33), wherein the electric motor has a housing which has an outer housing part (2), a bearing flange (1) and a cover part (3), wherein the outer housing part (2) has a first screw thread connected to a screw thread of the bearing flange (1), and wherein the outer housing part (2) has a second screw thread connected to a screw thread of the cover part (3). Ideally, the two screw axes of all said screw threads are aligned coaxially to one another.

Description

[0001] Electric motor, especially brake motor

[0002] Description:

[0003] The invention relates to an electric motor, in particular a brake motor.

[0004] It is generally known that an electric motor has a housing.

[0005] The invention is therefore based on the objective of designing an electric motor that is easy to manufacture.

[0006] According to the invention, the problem is solved in the electric motor according to the features specified in claim 1.

[0007] Important features of the invention in the electric motor, in particular brake motor, are that the electric motor has a housing which has an outer housing part, a bearing flange and a flange part, wherein the outer housing part has a first screw thread which is connected to a screw thread of the bearing flange, in particular screwed together, wherein the outer housing part has a second screw thread which is connected to a screw thread of the cover part, in particular screwed together.

[0008] A key advantage is that the housing can be assembled simply by screwing it together. In the first manufacturing step, only the outer housing part needs to be screwed onto the bearing flange. Then, in a subsequent second step, particularly after the cables have been routed through the cable glands, the cover part is screwed onto the outer housing part. The flattened surfaces of the outer housing part improve grip during the first step, making this assembly step particularly quick and easy.

[0009] ISI \ EIDOPAT 21.10.2025 The important aspect of the invention is that the electric motor has a cylindrical housing that can only be assembled by screwing, with flattened sections on the otherwise cylindrical shell of the housing increasing grip and serving for the installation of cable glands, thus enabling simple, quick and safe assembly.

[0010] In a preferred embodiment, the outer housing part is essentially hollow and cylindrical. This design offers the advantage that liquids drain away quickly, leaving no residue on the housing. This makes the surface of the electric motor easy to clean.

[0011] In an advantageous embodiment, a first flattened area is formed on the outer surface of the outer housing part, which has a through-hole in which a first cable gland is arranged. The advantage here is that the cable gland can be precisely positioned and a high degree of protection can be achieved because the flattened area provides a flat surface against which a seal can reliably create a seal.

[0012] In an advantageous embodiment, a hollow inner housing part is arranged within the outer housing part and functions as the stator housing of the electric motor. An advantage of this design is that the inner housing can be made of a different material than the outer housing part and / or that mechanical vibrations from the inner housing part to the outer housing part are forced to propagate through the interface between the two housing parts and are thus dampened. This mechanical decoupling dampens vibrations. Furthermore, axial shocks transmitted into the electric motor via the rotor shaft are not transmitted from the inner to the outer housing part, or only to a negligible extent.

[0013] In an advantageous embodiment, the hollow inner housing part is inserted into the outer housing part and is at least frictionally connected to it. The advantage here is that play can be prevented, thus enabling smooth operation, as the outer housing stabilizes the inner housing part.

[0014] In an advantageous embodiment, a first bearing of the rotor shaft of the electric motor is accommodated in the bearing flange, while a second bearing of the rotor shaft of the electric motor is accommodated in the flange part. An advantage of this design is that the housing is composed of the bearing flange, the cover part, and the outer housing part, i.e., only a small number of parts. The flange part is radially surrounded and protected by the outer housing part and rests against the inner housing part, particularly on the side of the inner housing part facing away from the bearing flange.

[0015] In an advantageous embodiment, the outer housing part is made of a different material than the inner housing part. This is advantageous because it improves the compensation of thermally induced changes in length. In particular, the inner housing part can be made of a material with lower thermal expansion.

[0016] In an advantageous embodiment, circumferentially spaced long screws project through recesses in the flange part and through bores in the inner housing part, particularly wherein the inner housing part is axially positioned between the bearing flange and the flange part, and particularly wherein a threaded section of each long screw is screwed into an axially oriented threaded bore in the bearing flange, and the screw head of each long screw presses the flange part towards the inner housing part, which is thus pressed against the bearing flange. It is advantageous that the electric motor is mounted on the bearing flange.

[0017] In an advantageous embodiment, the first screw thread has a thread whose maximum rotation angle or screw angle is designed such that, when the outer housing part is fully screwed into the screw thread of the bearing flange, the shortest cable length is enabled or achieved within the outer housing part for a cable, particularly a low-voltage cable, passing through the first cable gland, with respect to all possible screw angle positions. The advantage here is that the cable length within the housing is minimal.

[0018] In an advantageous embodiment, a second flattened area is formed on the outer surface of the outer housing part, which has a through-hole through which a second cable entry is arranged. The advantage here is that the cable length of a signal cable within the housing is minimized.

[0019] In an advantageous embodiment, when the outer housing part is fully screwed into the screw thread of the bearing flange, the shortest possible cable length for a cable, particularly a low-voltage cable, passing through the second cable gland is achieved within the outer housing part with respect to all possible screw angle positions. The advantage here is that the cable length is minimal.

[0020] In an advantageous embodiment, the flange part has a braking surface, in particular a finely machined surface. The advantage here is that the flange part not only accommodates a bearing of the rotor shaft, but also dissipates frictional heat from the brake to the surroundings and also holds the brake in place.

[0021] In an advantageous embodiment, a brake pad carrier, particularly one shaped like a perforated disc, is arranged to be rotationally fixed to the rotor shaft, particularly via an annular driver mounted on the rotor shaft and connected to the rotor shaft in a rotationally fixed manner by means of a keyway connection. The driver has external teeth and is arranged to be axially movable. In particular, an internal toothing of the brake pad carrier is mounted onto the external toothing and engages with it. An advantage of this arrangement is that frictional contact between one of the brake pads of the brake pad carrier and the braking surface of the bearing flange can be achieved by moving the brake pad carrier.

[0022] In an advantageous embodiment, a magnet body connected to the flange part, in particular via bolts, has an annular recess in which an electrically energizable winding is received, in particular wherein the annular axis is aligned coaxially with the axis of rotation of the rotor shaft, wherein a ferromagnetic armature disk is arranged axially between the magnet body and the brake pad carrier, which is rotationally fixed to the magnet body and axially movable, wherein spring elements supported on the magnet body press against the armature disk, in particular wherein bolts fixed in the magnet body are connected to the flange part. An advantage of this is that in the event of a power failure, the brake engages automatically, thus ensuring a high level of safety. Furthermore, the brake is completely enclosed within the housing and thus protected from dirt. The brake is also mounted on and held by the flange part.

[0023] In a preferred embodiment, when the winding is energized, the armature disc is pulled towards the magnet body against the spring force generated by the spring elements, and when the winding is not energized, the spring elements push the armature disc towards the brake pad carrier. The advantage of this is that reliable operation can be achieved.

[0024] In a preferred design, the lid, bearing flange, and outer housing are each made of stainless steel. This offers the advantage of preventing corrosion, thus enabling its use in food production.

[0025] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0026] The invention will now be explained in more detail with reference to schematic illustrations:

[0027] Figure 1 shows a brake motor according to the invention in an oblique view in a first viewing direction.

[0028] Figure 2 shows the brake motor in a different viewing direction, in an oblique view.

[0029] Figure 3 shows a longitudinal section of the brake motor.

[0030] Figure 4 shows a housing part 2 of the brake motor in an oblique view.

[0031] Figure 5 shows a longitudinal section through the housing part 2.

[0032] Figure 6 shows a bearing flange 1 of the brake motor in an oblique view.

[0033] Figure 7 shows the cover part 3 of the brake motor in an oblique view.

[0034] As shown in the figures, the brake motor has an electric motor with an electromagnetically actuated brake 33, wherein the brake motor is enclosed by an outer housing part 2, which is connected on the output side to a bearing flange 1 and on the side of the outer housing part 2 facing axially away from the bearing flange 1 to a cover part.

[0035] The bearing flange 1 is screwed to the outer housing part 2 and the cover part 3 is also screwed to the outer housing part 2.

[0036] A hollow cylindrical inner housing part is inserted into the hollow cylindrical outer housing part 2 and thereby positively connected. Advantageously, the inner housing part can thus be manufactured from a different material than the outer housing part 2.

[0037] A threaded section 40, in particular an external threaded section, is formed on the axial end region of the outer housing part 2 facing the bearing flange 1, such that the outer housing part 2 can be screwed into an internal threaded section formed on the bearing flange 1 via this threaded section 40. The inner housing part has axially through bores 50 spaced apart circumferentially for long screws. A flange part 31, to which the brake is attached, is arranged on the side of the inner housing part facing away from the bearing flange 1.

[0038] The long screws protruding through the flange part 31 and the inner housing part are screwed into axially oriented threaded bores in the bearing flange 1. Thus, the screw heads of the long screws 30 press the flange part 31 onto the inner housing part, which is therefore pressed onto the bearing flange 1.

[0039] The stator winding 32 of the electric motor is arranged radially inside the inner housing part.

[0040] The rotor shaft 6 of the electric motor is rotatably mounted via a first bearing which is received in the bearing flange 1 and via a second bearing which is received in the flange part 31.

[0041] The cover part 3 has an external thread area which is screwed into an internal thread area of ​​the outer housing part 2.

[0042] In this way, the entire outer casing can be manufactured by screw connections.

[0043] The electric motor is mounted on the bearing flange 1 by first placing the inner housing part with the stator onto the bearing flange, and then fitting the outer housing part 2 onto the inner housing part and screwing it onto the bearing flange 1 using the threaded screw. After inserting and tightening the long screws 30, the flange part 31 is pressed against the bearing flange 1 via the interposed inner housing part, thus securing the brake on the electric motor. Finally, the cover part 3 is screwed onto the outer housing part 2.

[0044] The entire outer casing is therefore completed during assembly by two screwing operations.

[0045] The electrical supply to the brake is provided through cable entry 4 for a low-voltage line, in particular a signal line, and the electrical supply to the stator winding is provided through cable entry 5 for a low-voltage line.

[0046] The cable feedthroughs 4 and 5 are each arranged on flat surfaces of the otherwise hollow cylindrical outer housing part 2.

[0047] The advantage of the flattened surfaces during assembly is that they increase the grip on the otherwise very smooth outer housing part 2, making screw connections simple and secure. It is also important that the screw angle at the end of the tightening process reaches precisely the intended value so that the outer housing part 2 achieves the angular position relative to the flange part 31 at which the cables passing through cable glands 4 and 5 within the outer housing part 2 have their shortest length.

[0048] The two screw threads of the outer housing part 2 have the same thread type; in particular, they are both right-hand threads. Therefore, assembly is very simple and can be carried out with minimal errors.

[0049] The brake has a magnetic body which is connected to the flange part 31 by means of bolts, with an armature disk made of a ferromagnetic material being fixed to the magnetic body in a rotationally fixed manner. The armature disk is axially movable, i.e., parallel to the axis of rotation of the rotor shaft. For this purpose, the armature disk has recesses through which the bolts protrude. Thus, the bolts act as guide elements for the armature disk.

[0050] An electrically energizable ring winding is received in a ring-shaped recess of the magnet body, wherein the ring axis is aligned coaxially to the axis of rotation of the rotor shaft, wherein the ring axis of the ring winding is aligned coaxially to the axis of rotation of the rotor shaft.

[0051] A perforated disc-shaped brake pad carrier has internal teeth that allow it to be pushed onto the external teeth of an annular drive pin, engaging with the external teeth. The drive pin is mounted on the rotor shaft and connected to it in a rotationally fixed manner, in particular by means of a keyway connection. Thus, the brake pad carrier is rotationally fixed to the rotor shaft and axially movable. Spring elements supported on the magnet body press against the armature disc. When the ring winding is energized, the armature disc is pulled towards the magnet body against the spring force generated by the spring elements. When the winding is not energized, the spring elements push the armature disc towards the brake pad carrier, which is thus pressed against a braking surface of the flange part 31, so that the brake pads, arranged axially on both sides of the brake pad carrier, come into frictional contact with the braking surface on one side and with the armature disc on the other.

[0052] The brake described here is therefore built on the flange part 31 and is also fastened together with the fastening of the flange part 31 by means of the long screws 30.

[0053] In further embodiments according to the invention, the inner housing part and the outer housing part 2 are made of the same material and / or are made in one piece, in particular in one piece.

[0054] Reference symbol list

[0055] 1 bearing flange 2 outer housing part

[0056] 3 lid part

[0057] 4 Cable entry for low-voltage line, in particular signal line

[0058] 5 Cable entry for low-voltage line

[0059] 6 Rotor shaft 30 Long screw

[0060] 31 Flange part

[0061] 32 Stator winding of the electric motor

[0062] 33 electromagnetically actuated brakes

[0063] 40 Thread area 50 Bore for long screw in inner housing part

[0064] 70 thread area

Claims

Patent claims:

1. Electric motor, in particular brake motor, wherein the electric motor has a housing comprising an outer housing part, a bearing flange and a cover part, wherein the outer housing part has a first screw thread which is connected, in particular screwed together, to a screw thread of the bearing flange, wherein the outer housing part has a second screw thread which is connected, in particular screwed together, to a screw thread of the cover part, in particular wherein the two screw axes of these two screw threads are coaxially aligned with each other.

2. Electric motor according to claim 1, characterized in that the outer housing part is essentially hollow cylindrical, and / or that a first flattening is formed on the outer surface of the outer housing part, which has a through bore on which a first cable passage is arranged.

3. Electric motor according to one of the preceding claims, characterized in that a hollow inner housing part is arranged in the outer housing part and functions as the stator housing of the electric motor.

4. Electric motor according to one of the preceding claims, characterized in that the hollow inner housing part is inserted into the outer housing part and is at least frictionally connected to the outer housing part.

5. Electric motor according to one of the preceding claims, characterized in that a first bearing of the rotor shaft of the electric motor is received in the bearing flange, wherein a second bearing of the rotor shaft of the electric motor is received in a flange part (31), in particular wherein the flange part is radially surrounded by the outer housing part and abuts the inner housing part, in particular wherein the inner housing part abuts the bearing flange.

6. Electric motor according to one of the preceding claims, characterized in that the outer housing part is made of a different material than the inner housing part.

7. Electric motor according to one of the preceding claims, characterized in that circumferentially spaced long screws project through recesses in the flange part and through bores in the inner housing part, in particular wherein the inner housing part is arranged axially between the bearing flange and the flange part, in particular wherein a respective threaded section of a respective long screw is screwed into a respective axially directed threaded bore of the bearing flange and the screw head of a respective long screw presses the flange part towards the inner housing part, which is thus pressed against the bearing flange.

8. Electric motor according to one of the preceding claims, characterized in that the first screw thread has a thread whose maximum rotation angle or screw angle is designed such that, when the outer housing part is fully screwed into the screw thread of the bearing flange, the shortest cable length is enabled or achieved within the outer housing part with respect to all possible screw angle positions for a cable, in particular a low-voltage cable, passing through the first cable passage.

9. Electric motor according to one of the preceding claims, characterized in that a second flattening is formed on the outer surface of the outer housing part, which has a through bore on which a second cable passage is arranged.

10. Electric motor according to one of the preceding claims, characterized in that when the outer housing part is fully screwed into the screw thread of the bearing flange for a cable, in particular a low-voltage cable, passing through the second cable passage, the shortest cable length of this cable is enabled or achieved within the outer housing part with respect to all possible screw angle positions.

11. Electric motor according to one of the preceding claims, characterized in that the flange part has a braking surface, in particular a finely machined surface.

12. Electric motor according to one of the preceding claims, characterized in that a brake pad carrier, in particular a perforated disc-shaped one, is connected to the rotor shaft in a rotationally fixed manner via an annular driver, which is mounted on the rotor shaft and in particular is connected to the rotor shaft by means of a keyway connection and has external teeth, and is arranged to be movable in the axial direction, in particular wherein an internal toothing of the brake pad carrier is mounted on the external toothing and is in engagement with the external toothing.

13. Electric motor according to one of the preceding claims, characterized in that a magnet body connected to the flange part, in particular via bolts, has an annular recess in which an electrically energizable winding is received, in particular wherein the annular axis is aligned coaxially to the axis of rotation of the rotor shaft, wherein a ferromagnetic armature disk is arranged axially between the magnet body and the brake pad carrier, which is rotationally fixed to the magnet body and is arranged to be axially movable, wherein spring elements supported on the magnet body press on the armature disk, in particular wherein bolts fixed in the magnet body are connected to the flange part.

14. Electric motor according to one of the preceding claims, characterized in that when the winding is energized, the armature disk is pulled towards the magnet body against the spring force generated by the spring elements, and when the winding is not energized, the spring elements push the armature disk towards the brake pad carrier.

15. Electric motor according to one of the preceding claims, characterized in that the cover part, the bearing flange and the outer housing part are each made of stainless steel.

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