Motor

Abstract

The invention relates to an electric machine having a stator housing, which is connected on one side to an end cap of the electric machine, which end cap receives a bearing of a rotor shaft of the electric machine, and which is connected on the other side to a bearing flange, which receives the other bearing of the rotor shaft, a magnet of an electromagnetically actuatable brake of an electric machine is connected to an end cap in a rotationally fixed manner, and a cover cap surrounds the magnet in such a way as to form a housing and is pressed against the end cap via a sealing element arranged in the middle.

Description

Technical Field

[0001] The present invention relates to an electric machine. Background Art

[0002] As is known, an electric machine can be implemented with an integrated brake, and thus an improvement in safety can be achieved by the ability to brake the electric machine. Summary of the Invention

[0003] Therefore, the object of the present invention is to improve the electric machine so as to enhance the safety of the electric machine.

[0004] According to the present invention, this object is achieved by an electric machine having the features given in claim 1.

[0005] In the electric machine, an important feature of the present invention is that the electric machine has a stator housing which is connected on one side to an end cover of the electric machine, the end cover receiving one bearing of the rotor shaft of the electric machine, and the stator housing is connected on the other side to a bearing flange which receives the other bearing of the rotor shaft.

[0006] Wherein, the magnet of the electromagnetically actuable brake of the electric machine is non-rotatably connected to the end cover.

[0007] In particular, the magnet is arranged on a side of the end cover axially facing away from the stator housing.

[0008] Wherein, a cover encloses the magnet in a housing-forming manner, in particular in a watertight and / or airtight manner, and is pressed onto the end cover via an intermediate seal, in particular a flat seal, in particular by the bolt head of a bolt, in particular the threaded region of the bolt is screwed into a threaded hole of the end cover.

[0009] The advantage here is that the cover encloses the brake in a housing-forming manner and is hermetically connected to the end cover in this way. In this way, the brake can be integrally arranged in the electric machine with a high protection level.

[0010] In an advantageous design, at least one threaded part passes through the bearing flange, the stator housing and the end cover, the at least one threaded part being a long bolt, a bolt or a screw, and the end cover is pressed against the stator housing by the threaded part head of the threaded part or a nut screwed onto the threaded part, and the bearing flange is pressed against the stator housing by the threaded part head of the threaded part or a nut screwed onto the threaded part. The advantage here is that the threaded part holds the electric machine together and the first axial end portions of the threaded part respectively extend into the internal space region enclosed by the cover. Here, the sealing property is ensured by providing a sealing ring on the threaded part head of the threaded part or on the nut.

[0011] In an advantageous design, the sealing ring is sleeved onto the threaded part and the sealing ring abuts against the end cover.

[0012] Wherein, the head of the threaded part or the nut is pressed onto the end cover via a sealing ring. The advantage here is that a high protection level for the brake can be ensured.

[0013] In an advantageous design, the cover has cylindrical outer shell sections adjacent to each other in the circumferential direction. The advantage here is that an increase in rigidity can be achieved. And a low vibration tendency and / or vibration ability of the cover can also be achieved. Therefore, the vibration of the cover is attenuated and resonance is avoided.

[0014] In an advantageous design, the areas covered by the respective cylindrical outer shell sections in the circumferential direction are of the same size. The advantage here is that simple manufacturing can be achieved.

[0015] In an advantageous design, the cylindrical axes of the respective cylindrical outer shell sections are parallel to the rotational axis of the rotor shaft of the motor and are spaced apart from the rotational axis of the rotor shaft of the motor. The advantage here is that compared with designing the radially outer periphery of the cover as a continuous cylindrical shell, the curvature of the cylindrical outer shell sections is smaller.

[0016] In an advantageous design, the radius of each cylindrical outer shell section is respectively greater than half of the maximum outer diameter of the cover. The advantage here is that compared with designing the outer periphery of the cover as a continuous cylinder, the curvature of the cylindrical outer shell sections is gentler. This allows water to flow out basically in all assembly directions, and high rigidity is achieved and resonance is suppressed.

[0017] In an advantageous design, the radius of each cylindrical outer shell section is respectively greater than the maximum radial distance of the cover with respect to the rotational axis of the rotor shaft. The advantage here is that compared with designing the outer periphery of the cover as a continuous cylinder, the curvature of the cylindrical outer shell sections is gentler. This allows water to flow out basically in all assembly directions, and high rigidity is achieved and resonance is suppressed.

[0018] In an advantageous design, the wall thickness of the cover is constant. The advantage here is that simple manufacturing can be achieved.

[0019] In an advantageous design, the wall thickness of the cover is independent of the circumferential direction. The advantage here is that simple manufacturing can be achieved.

[0020] In an advantageous design, the threaded part extends from the end cover into the inner space region surrounded by the cover. The advantage here is that the threaded part realizes the connection of the motor, and the axial end region of the threaded part extends into the inner space region surrounded by the cover.

[0021] In an advantageous design, the screw extends axially through the magnet, and the screw extends out of the magnet on both axial sides.

[0022] In particular, another magnet of another brake can be fixed to a screw protruding from the magnet. The advantage here is that the safety can be increased by providing another brake. For this purpose, the rotor shaft must pass through at least one magnet of the brake arranged axially close on the end cover.

[0023] In an advantageous design, an annular actuating part with an external tooth part is slipped onto the rotor shaft and is connected to the rotor shaft in a non-rotatable manner, in particular by means of a key connection.

[0024] An annular disc-shaped brake pad carrier is slipped onto the actuating part, and the internal tooth part of the brake pad carrier meshes with the external tooth part of the actuating part.

[0025] The brake pad carrier is thus connected to the actuating part in a non-rotatable manner and is arranged so as to be axially movable towards the actuating part.

[0026] An energizable coil is received in an annular recess of the magnet.

[0027] An armature plate is arranged axially between the magnet and the brake pad carrier.

[0028] The armature plate is connected to the magnet in a non-rotatable manner.

[0029] The armature plate is arranged so as to be axially movable, in particular in such a way that an axially oriented pin passing through an opening of the armature plate is pressed into a recess of the magnet.

[0030] The armature plate is arranged on the side of the brake pad carrier axially facing away from the end cover.

[0031] Spring elements supported on the magnet and spaced apart from each other in the circumferential direction press against the armature plate.

[0032] In particular, a braking surface is formed on the end cover. The advantage here is that the brake automatically engages when power is off and the brake is only released when the coil is energized.

[0033] In an advantageous design, when the coil is energized, the armature plate is attracted towards the magnet against the spring force generated by the spring elements. The advantage here is that the safety is increased because release is only possible when energized.

[0034] In an advantageous design, when the coil is not energized, the armature plate is pressed by the spring elements against the brake pad carrier, and the brake pad carrier is thus pressed against the braking surface formed on the end cover or against a friction plate fixed to the end cover and having a braking surface. The advantage here is that the safety is increased because the brake engages when power is off.

[0035] In an advantageous design, the armature plate and the brake pad carrier are surrounded by a cover and / or arranged in an interior space region surrounded by the cover. The advantage here is that the brake is completely surrounded and protected by the cover.

[0036] In an advantageous design, the cover is designed as a plastic injection molding. The advantage here is that simple and low-cost manufacturing can be achieved. In an alternative design made of steel, although higher die costs are incurred due to the higher mechanical strength of the material, safety can also be improved.

[0037] Further advantages are given by the dependent claims. The invention is not limited to the feature combinations of the claims. For a person skilled in the art, other reasonable combination possibilities of the claims and / or single claim features and / or the features of the description and / or the features of the drawings can be obtained, especially from the purpose put forward and / or by comparison with the prior art. Description of the Drawings

[0038] The invention will now be explained in detail with reference to the schematic drawings:

[0039] In Figure 1 a longitudinal section through the electric machine according to the invention is shown.

[0040] In Figure 2 a partial view of the electric machine is shown in exploded view.

[0041] In Figure 3 the electric machine is shown in a perspective view.

[0042] List of Reference Numerals:

[0043] 1 End cover

[0044] 2 Magnet

[0045] 3 Screw

[0046] 4 Cover

[0047] 5 Stator housing

[0048] 6 Bearing flange

[0049] 20 Sealing ring

[0050] 21 Flat seal Detailed Description of the Invention

[0051] As shown in the figure, the electric machine has a stator housing 5, which is connected on one side to a bearing flange 6 and on the other side to an end cover 1.

[0052] The end cover 1 is spaced apart from the bearing flange 6 and receives a bearing for rotatably supporting the rotor shaft. The bearing flange 6 receives a further bearing for rotatably supporting the rotor shaft.

[0053] The long bolts connect the end cover 1 and the bearing flange 6 to the stator housing 5.

[0054] Accordingly, the respective long bolts pass through the notches of the end cover 1 and through the notches of the bearing flange 6. The bolt head of the long bolt is pressed onto the end cover 1 via a sealing ring 20 sleeved onto the long bolt, wherein a nut screwed onto the threaded region of the long bolt is pressed onto the bearing flange 6. Accordingly, both the bearing flange 6 and the end cover 1 are pressed onto the stator housing 5.

[0055] The sealing ring 20 ensures the safety and sealing of the connection between the long bolt and the bearing flange 6.

[0056] Accordingly, the long bolts hold the electric machine together.

[0057] The electric machine also has an electromagnetically actuable brake, which has a ferromagnetic body 2, and the ferromagnetic body is non-rotatably connected to the end cover 1 by means of a screw 3 passing through the magnet 2.

[0058] The screw 3 projects from the magnet 2 such that a second brake can be axially mounted next to the mentioned first brake, thereby enabling increased operating safety.

[0059] The magnet has an annular recess, and the annular axis of the annular recess is parallel to the axis of rotation of the rotor shaft of the electric machine. An energizable coil is received in the annular recess.

[0060] An annular actuating member with an external tooth portion is sleeved onto the rotor shaft and is non-rotatably connected to the rotor shaft, in particular by means of a key connection.

[0061] An annular disc-shaped brake pad carrier is sleeved onto the actuating member, and the internal tooth portion of the brake pad carrier meshes with the external tooth portion of the actuating member such that the brake pad carrier is non-rotatably connected to the actuating member and thus to the rotor shaft, and is arranged so as to be axially movable.

[0062] Brake pads are mounted on both axial sides of the brake pad carrier.

[0063] A ferromagnetic armature plate is axially arranged between the brake pad carrier and the magnet. The armature plate is non-rotatably connected to the magnet.

[0064] Furthermore, the armature plate is arranged so as to be axially movable. In particular, a pin passes through an opening of the armature plate and is inserted into a recess or a drilled hole of the magnet.

[0065] A braking surface is formed on the end cover 1.

[0066] A spring element supported on the magnet presses onto the armature plate.

[0067] Therefore, when the coil is energized, the armature plate is attracted towards the magnet 2 against the spring force generated by the spring element. However, when the coil is not energized, the armature plate is pressed by the spring element towards the brake pad carrier, and thus the brake pad carrier is pressed against the braking surface formed on the end cover 1, which is arranged on the side of the brake pad carrier facing away from the armature plate.

[0068] Therefore, the brake is released when the coil is energized and engaged when the coil is not energized.

[0069] The cover 4 is fixed to the end cover 1, wherein a planar seal 21 is arranged between the cover 4 and the end cover 1 to ensure a sealed connection between the cover 4 and the end cover 1. The end cover 1 is also a component forming the housing of the electric motor.

[0070] The long bolts are arranged radially within the radial range covered by the cover 4.

[0071] The screw 3 is arranged radially within the radial range covered by the cover 4.

[0072] The pins are arranged radially within the radial range covered by the cover 4.

[0073] The axial direction is parallel to the axis of rotation of the rotor shaft, and the radial direction, circumferential direction, and radial distance are respectively referenced to the axis of rotation of the rotor shaft of the electric motor.

[0074] The region covered by the brake pad carrier in the axial direction is arranged within the region covered by the cover 4 in the axial direction.

[0075] The region covered by the magnet 2 in the axial direction is arranged within the region covered by the cover 4 in the axial direction.

[0076] The region covered by the armature plate in the axial direction is arranged within the region covered by the cover 4 in the axial direction.

[0077] The radial range covered by the magnet 2, armature plate, and brake pad carrier is included within the radial range covered by the cover 4.

[0078] Therefore, the cover 4 encloses the brake, wherein the internal space including the brake and enclosed by the cover 4 is sealed by the planar seal 21 and the sealing ring 20.

[0079] To reduce vibration and increase rigidity, the outer periphery of the cover 4 consists of four regions, each of which is a cylindrical housing section with a cylindrical radius greater than half of the maximum outer diameter of the cover 4.

[0080] In this way, the cover 4 has a rounded, polygonal appearance, enabling rapid outflow of the liquid and achieving high rigidity and low vibration capabilities. Additionally, it is possible to achieve the largest possible volume of the surrounding internal space region. Here, the wall thickness of the cover 4 is preferably constant.

[0081] The regions respectively covered by each of the cylindrical housing sections in the circumferential direction are of the same size. The cylindrical axis is parallel to, but spaced from, the rotational axis of the rotor shaft.

[0082] In other embodiments according to the invention, the cover is not composed of four cylindrical housing sections, but of other numbers of three, five, six, seven, or eight cylindrical housing sections. The regions respectively covered by each of the cylindrical housing sections in the circumferential direction are again of the same size. The cylindrical axis is likewise parallel to, but spaced from, the rotational axis of the rotor shaft.

[0083] In other embodiments according to the invention, a screw with a nut is used instead of the long bolt with a bolt head.

[0084] In other embodiments according to the invention, the actuating member and the rotor shaft are integrally formed together, i.e., the external tooth portion is directly formed on the rotor shaft.

[0085] In other embodiments according to the invention, the braking surface is formed on a plate member, in particular a friction plate, which is non-rotatably connected to the end cover and axially arranged between the end cover and the brake pad carrier.

Claims

1. An electric motor, The electric motor has a stator housing which is connected on one side to an end cover of the electric motor, the end cover receiving one bearing of the rotor shaft of the electric motor, and the stator housing is connected on the other side to a bearing flange which receives the other bearing of the rotor shaft, The magnet of the electromagnetically actuatable brake of the electric motor is non-rotatably connected to the end cover, In particular, the magnet is arranged on a side of the end cover axially remote from the stator housing, Characterized in that, The cover surrounds the magnet in such a way as to form a housing - in particular in a watertight and / or airtight manner - and is pressed against the end cover via an intermediate seal - in particular a planar seal - and in particular by the bolt head of a bolt, in particular the threaded region of the bolt is screwed into a threaded hole of the end cover.

2. The electric motor according to claim 1, Characterized in that, At least one threaded element passes through the bearing flange, the stator housing and the end cover, and this at least one threaded element is a long bolt, a bolt or a screw, and the end cover is pressed against the stator housing by means of the threaded element head of this threaded element or a nut screwed onto the threaded element, and the bearing flange is pressed against the stator housing by means of the threaded element head of the threaded element or a nut screwed onto the threaded element.

3. The electric motor according to any one of the preceding claims, Characterized in that, A sealing ring is slipped onto the threaded element and the sealing ring abuts against the end cover. The threaded element head or the nut presses against the end cover via the sealing ring.

4. The electric motor according to any one of the preceding claims, Characterized in that, The cover has cylindrical outer housing sections adjacent to each other in the circumferential direction.

5. The electric motor according to any one of the preceding claims, Characterized in that, The areas covered by the respective cylindrical outer housing sections in the circumferential direction are of the same size.

6. The electric motor according to any one of the preceding claims, Characterized in that, The cylindrical axes of the respective cylindrical outer housing sections are parallel to the rotational axis of the rotor shaft of the electric machine and are spaced apart from the rotational axis of the rotor shaft of the electric machine.

7. The electric motor according to any one of the preceding claims, Characterized in that, The radius of each cylindrical outer housing section is greater than half of the maximum outer diameter of the cover. and / or The radius of each cylindrical outer housing section is greater than the maximum radial distance of the cover with respect to the rotational axis of the rotor shaft.

8. The electric motor according to any one of the preceding claims, Characterized in that, The wall thickness of the cover is constant. and / or The wall thickness of the cover is independent of the circumferential direction.

9. The electric motor according to any one of the preceding claims, Characterized in that, The threaded element extends from the end cover into the interior space region surrounded by the cover.

10. The electric machine according to any one of the preceding claims, characterized in that, The screw extends axially through the magnet and the screw projects out of the magnet on both axial sides. In particular, additional magnets of additional brakes can be fixed to the screw projecting out of the magnet.

11. The electric machine according to any one of the preceding claims, characterized in that, An annular actuating member with an external tooth section is slipped onto the rotor shaft and is connected to the rotor shaft in a non-rotatable manner - in particular by means of a key connection. An annular disc-shaped brake pad carrier is slipped onto the actuating member, and the internal tooth section of this brake pad carrier meshes with the external tooth section of the actuating member. such that the brake pad carrier is connected to the actuating member in a non-rotatable manner and is arranged in such a way that it can move axially towards the actuating member. An energizable coil is received in the annular recess of the magnet. The armature plate is arranged axially between the magnet and the brake pad carrier. The armature plate is connected to the magnet in a non-rotatable manner. The armature plate is arranged in such a way that it can move axially, in particular in such a way that a - in particular axially oriented - pin passing through an opening of the armature plate is pressed into a recess of the magnet. The armature plate is arranged on the side of the brake pad carrier axially facing away from the end cover. Spring elements supported on the magnet and spaced apart from each other in the circumferential direction press against the armature plate. In particular, a braking surface is formed on the end cover.

12. The electric machine according to any one of the preceding claims, characterized in that, When the coil is energized, the armature plate is attracted towards the magnet against the spring force generated by the spring elements.

13. The electric machine according to any one of the preceding claims, characterized in that, When the coil is not energized, the armature plate is pressed against the brake pad carrier by the spring elements, and thus the brake pad carrier is pressed against the braking surface formed on the end cover or against a friction plate fixed to the end cover and having a braking surface.

14. The electric machine according to any one of the preceding claims, characterized in that, The armature plate and the brake pad carrier are surrounded by the cover and / or are arranged in the interior space region surrounded by the cover.

15. The electric machine according to any one of the preceding claims, characterized in that, The cover is designed as a plastic injection molding.

Images