Electric machine having a stator housing and a rotor shaft

Abstract

The invention relates to an electric machine having a stator housing and a rotor shaft, wherein a sealing end cap is connected to the stator housing, in particular non-rotatably, wherein a bearing for rotatably supporting the rotor shaft is accommodated in the sealing end cap, wherein a centrifugal disc is non-rotatably connected to the rotor shaft, wherein a protective cover is connected to the sealing end cap, wherein the protective cover covers the centrifugal disc, wherein the rotor shaft projects through a recess of the protective cover.

Description

Technical Field

[0001] The present invention relates to an electric motor having a stator housing and a rotor shaft. Background Technology

[0002] It is generally known that an electric motor has a rotor shaft that is rotatably supported relative to the stator housing of the motor. Summary of the Invention

[0003] Therefore, the purpose of this invention is to improve the service life of motors used in industrial applications.

[0004] According to the present invention, this objective is achieved by means of an electric motor as described below.

[0005] In the case of motors having a stator housing and a rotor shaft, an important feature of the present invention is that the bearing cover is connected to the stator housing, and in particular, the connection is non-rotatable.

[0006] The bearing cover includes a sealing end cap and a bearing receiving ring connected to the sealing end cap.

[0007] The bearing housing contains a bearing for rotatably supporting the rotor shaft.

[0008] In this configuration, the centrifugal disc and the rotor shaft are connected in a way that prevents relative rotation.

[0009] The protective cover is connected to the bearing housing ring.

[0010] Among them, the protective cover covers the centrifuge disc,

[0011] The rotor shaft extends through the recess in the protective cover.

[0012] The advantage here is that a high level of protection can be achieved in a simple manner. Therefore, the service life of the motor is extended, and the effective use and operational safety of the motor are guaranteed. Liquid particles that intrude from the surrounding environment are thrown out by the centrifugal disc, collected by the protective cover, guided downwards, and discharged at the interruption in the flange area of ​​the protective cover. Furthermore, the protective cover is fitted onto the bearing receiving ring and thus sealed. A gapless connection is preferably achieved between the sealing end cap and the protective cover.

[0013] In an advantageous design, a shaft sealing ring is housed within the sealing end cap, which seals or forms a seal relative to the rotor shaft. The advantage here is that the sealing end cap can be centered within the bearing housing ring in such a way that the shaft sealing ring housed within the sealing end cap can be positioned and arranged as precisely as possible relative to the rotor shaft, i.e., centered.

[0014] In an advantageous design, a protective cover is fitted over the bearing retaining ring, and in particular, the protective cover is force-locked / friction-locked to the bearing retaining ring. The advantage here is that the protective cover can be positioned as precisely as possible relative to the bearing retaining ring and therefore relative to the bearing housed therein.

[0015] In an advantageous design, at least one screw, screwed into a radially oriented threaded hole machined in the bearing retainer ring, presses the protective cover against the bearing retainer ring with its screw head. The advantage here is that the form-locking fixation achieved by the screw additionally ensures the safety of the force-locked connection between the protective cover and the bearing cap, and especially the bearing retainer.

[0016] In one advantageous design, the sealing end cap has a hole, particularly a hole centrally located in the sealing end cap, through which the rotor shaft extends and an annular groove is formed on the inner side of the hole.

[0017] In this design, the annular groove's axis of rotation is coaxially oriented with the rotor shaft's axis of rotation. An advantage here is that the annular gap between the rotor shaft and the sealing end cap has a variable, and especially periodically varying, radial extension dimension along the axial direction. Therefore, for externally entering particles that create a labyrinth, this labyrinth becomes a large obstacle due to the flow zone / flow field generated within the annular gap.

[0018] In an advantageous design, a sealing end cap is accommodated at a hole in the bearing retainer ring, particularly at a hole centrally located within the bearing retainer ring, and in particular, the sealing end cap thus covers the hole in the bearing retainer ring. The advantage here is that the sealing end cap can be positioned and connected to the bearing retainer ring in such a way that the orientation of the shaft seal ring relative to the rotor shaft is optimized.

[0019] In one advantageous design, the centrifugal disc is fitted onto the rotor shaft, particularly in a force-locked connection with the rotor shaft. The advantage here is that the force-locked connection of the centrifugal disc to the rotor shaft allows for simple and rapid motor manufacturing.

[0020] In an advantageous design, the annular grooves are spaced apart axially, particularly regularly spaced apart. This allows for the construction of an annular gap with a variable, particularly periodically varying, radial thickness between the rotor shaft and the sealing end cap. The resulting flow field within the annular gap is configured to make it difficult for particles to enter the internal space of the motor. This is particularly suitable for mists containing liquid particles that occur in the environment surrounding the engine.

[0021] In an advantageous design, the protective cover is elastically pre-tightened and / or thermo-fitted onto the bearing receiving ring. The advantage here is that a simple sealing connection can be established.

[0022] In one advantageous design, the protective cover is made of plastic. The advantage here is that the protective cover can be manufactured at a cost-effective price and requires minimal force during connection.

[0023] In an advantageous design, the protective cover has a plate-like, especially perforated plate-like, substrate.

[0024] In particular, the rotor shaft extends through a notch in the base.

[0025] In particular, the radial extension of the plate is at least ten times its axial extension.

[0026] A flange region is formed on the radial outer edge of the plate-like substrate, and this flange region protrudes axially. The advantage here is that the flange region can be fitted onto a bearing receiving ring and thus can be connected in a sealing manner with minimal force consumption.

[0027] In an advantageous design, the area covered by the flange region in the axial direction includes the area covered by the centrifugal disc in the axial direction and the area covered by the sealing end cap in the axial direction, as well as, in particular, the area covered by the bearing receiving ring in the axial direction. The advantage here is that the protective cover surrounds and / or covers the centrifugal disc and the sealing end cap, together with the annular gap and the shaft sealing ring housed in the sealing end cap, in a manner forming a housing.

[0028] In an advantageous design, the flange region is interrupted in the circumferential direction, specifically having an interrupted portion.

[0029] The base component is connected to the stator housing.

[0030] The interrupted region circumferentially covers an area that overlaps with or is included by the area circumferentially covered by the base component. An advantage here is that the interrupted region is oriented downwards toward the base component, i.e., in the direction of gravity, thus allowing any intruding liquid ejected by the centrifugal disc to flow out.

[0031] In an advantageous design, the area circumferentially covered by the base component and the area circumferentially covered by the flange region together are completely uninterrupted circumferentially. The advantage here is that the interrupted area is oriented downwards toward the base component, i.e., in the direction of gravity, and thus allows for the outflow of intrusive liquid ejected by the centrifugal disc.

[0032] In this specification, the axial direction is parallel to the rotation axis of the rotor shaft, and the circumferential direction is based on the rotation axis. In particular, the radial direction is also based on the rotation axis.

[0033] In an advantageous design, the axial wall thickness of the centrifugal disc, particularly the axial width, monotonically decreases with increasing radial distance, especially outward in the radial direction. This has the advantage that the centrifugal disc extends into a radially inward recess / cutout formed on the sealing end cap.

[0034] In an advantageous design, the axial region covered by the centrifugal disc overlaps with the axial region covered by the sealing end cap. The advantage here is that the centrifugal disc extends into the recess of the sealing end cap, particularly the lateral recess, which opens especially in the axial direction.

[0035] This invention is not limited to the combination of features in the claims. Those skilled in the art, particularly those seeking to present the invention for the purpose of comparison with the prior art, will find other meaningful combinations of the claims and / or individual claim features and / or specification features and / or drawing features. Attached Figure Description

[0036] The invention will now be explained in detail with the aid of schematic diagrams.

[0037] exist Figure 1 The image shows a portion of the motor according to the invention cut open.

[0038] exist Figure 2 Enlarged to show Figure 1 A region.

[0039] exist Figure 3 The protective cover 1 of the motor is shown in a perspective view.

[0040] exist Figure 4 The centrifugal disc 2 of the motor is shown in a perspective view.

[0041] exist Figure 5 The sealing end cover 3 of the motor is shown in a perspective view.

[0042] exist Figure 6 The shaft seal ring 4 of the motor is shown in a perspective view.

[0043] exist Figure 7 The image shows a partial cross-sectional view of the motor.

[0044] exist Figure 8 Enlarged to show Figure 7 Part of the area.

[0045] exist Figure 9 The oblique view is enlarged and shown in the middle. Figure 7 Part of the area.

[0046] List of reference numerals in the attached diagram:

[0047] 1 protective cover

[0048] 2 centrifuge discs

[0049] 3. Sealed end cap

[0050] 4-axis sealing ring

[0051] 5 rotor shafts

[0052] 6 Stator Housing

[0053] 7 base components

[0054] 50 Annular Groove

[0055] 70 bearing retainer ring Detailed Implementation

[0056] As shown in the figure, the motor has a rotor shaft 5, which is supported by bearings in a manner that allows it to rotate relative to the stator housing 6 of the motor.

[0057] The stator housing has annular heat sinks that are spaced apart from each other, particularly regularly, in the axial direction, i.e., in the direction of the rotation axis of the rotor shaft 5. That is, the heat sinks protrude radially, thus enabling rapid liquid drainage. The axial extension of the heat sinks is less than their radial extension. The heat sinks are designed to be continuous in the circumferential direction.

[0058] The bearing for the rotor shaft 5 is housed in a bearing housing ring 70, which is connected to the stator housing 6, specifically in a non-rotatable manner. A sealing end cap 3 is housed in a centrally located hole in the bearing housing ring, thereby covering the hole, but having another hole through which the rotor shaft 5 extends.

[0059] A shaft sealing ring 4 is housed in the sealing end cover 3. The sealing lip of the shaft sealing ring runs over the machined surface area of ​​the rotor shaft 5, and thus seals towards the rotor shaft 5.

[0060] In addition, the sealing end cover 3 has a central hole through which the rotor shaft extends and a plurality of annular grooves 50 are formed on the inner side of the central hole.

[0061] The annular groove's axis of rotation is coaxially oriented with the rotation axis of rotor shaft 5. The annular grooves are spaced apart from each other axially, and in particular, are regularly spaced apart from each other axially.

[0062] On the side of the sealing end cover 3 away from the shaft sealing ring 4, the centrifugal disk 2 and the rotor shaft 5 are connected in a non-rotatable manner, especially in a force-locked manner.

[0063] A protective cover 1 is fitted onto the bearing housing ring 70. The protective cover has a recess arranged in the middle through which the rotor shaft 5 protrudes. A narrow gap is constructed between the rotor shaft 5 and the protective cover 1, which is non-rotatably connected to the bearing housing ring 70.

[0064] The protective cover 1 has a plate-like, especially perforated plate-like, substrate with a notch through which the rotor shaft 5 extends. A flange region is formed on the radially outer edge of the plate-like substrate, and the flange region extends in the axial direction.

[0065] The area covered axially by the flange region includes the area covered axially by the sealing end cap 3 and the bearing receiving ring 70. Therefore, the sealing end cap 3 and the bearing receiving ring 70 are covered to prevent contaminant particles from entering from the external environment.

[0066] The flange region has a circumferential interruption, wherein the protective cover is oriented relative to the motor such that the interruption opens downwards. Therefore, the amount of liquid ejected by the centrifugal disc 2 can flow downwards on the inside of the protective cover 1 to the interruption and from there out into the surrounding environment.

[0067] The base component 7, especially the base plate, is screwed onto or integrally cast onto the underside of the stator housing 6.

[0068] The area circumferentially covered by the base component 7 includes the area circumferentially covered by or overlapping with the unique interruption. Apart from the interruption, the flange region has no other interruptions. Therefore, the flange region can be manufactured sufficiently stably and rigidly.

[0069] The flange region has a rounded portion and a flat portion. The flat portion is vertically oriented and allows for particularly rapid liquid outflow. The rounded portion guides the outflowing liquid downwards.

[0070] The protective cover 1 is secured to the bearing receiving ring 70 by at least one radially oriented screw. For this purpose, the screw extends through the protective cover 1, wherein the threaded portion of the screw is screwed into a radially oriented threaded hole machined in the bearing receiving ring 70, and the screw head presses the protective cover 1 against the bearing receiving ring 70.

[0071] The area covered by the protective cover 1 in the axial direction includes the area covered by the centrifugal disc 2 in the axial direction and overlaps with the area covered by the sealing end cap 3 in the axial direction, but also overlaps with the area covered by the bearing receiving ring 70 in the axial direction.

[0072] Preferably, the protective cover 1 is made of plastic and thus is elastically preloaded against the bearing receiving ring 70. Here, the flange region is expanded to generate elastic preload and press the protective cover 1 against the bearing receiving ring 70.

[0073] To form a radially oriented labyrinth, the axial region covered by the centrifugal disc 2 overlaps with the axial region covered by the sealing end cap 3. For this purpose, the centrifugal disc 2 has an axially widened portion in its radially inner region, which can be called a base ring, on which an axially thinner disc is formed. The centrifugal disc 2 is formed in one piece, particularly integrally. The axial wall thickness, i.e., especially the axial width, decreases monotonically with increasing radial distance.

[0074] In another embodiment of the invention, the flange region is composed of flat, adjacent surface regions. Preferably, the adjacent surface regions always have the same angle.

[0075] In another embodiment of the invention, a recess centrally located within the protective cover 1 is connected to the interruption portion, i.e., the recess centrally located within the protective cover leads to the interruption portion. This method saves material and simplifies manufacturing.

Claims

1. An electric motor having a stator housing and a rotor shaft, The bearing cover is connected to the stator housing in a manner that prevents relative rotation. The bearing cover has a sealing end cap (3) and a bearing receiving ring (70) connected to the sealing end cap (3). in, A bearing for rotatably supporting the rotor shaft is housed in the bearing housing ring (70). Its features are, The centrifuge disc is connected to the rotor shaft in a manner that prevents relative rotation. The protective cover is connected to the bearing housing ring. The protective cover covers the centrifuge tray. The rotor shaft extends through the recess in the protective cover. The centrifugal disc (2) has an axially widened portion in its radially inner region. The axial width of the centrifuge disc decreases monotonically as the radial distance increases. The axial region covered by the centrifugal disc overlaps with the axial region covered by the sealed end cap, thus forming a radially oriented labyrinth. The protective cover has a plate-shaped base, and a flange region is formed on the radially outer edge of the plate-shaped base. The flange region protrudes axially, and the area covered by the flange region in the axial direction includes the area covered by the centrifugal disc in the axial direction, the area covered by the sealing end cap in the axial direction, and the area covered by the bearing receiving ring in the axial direction. The sealing end cap has a hole centrally located within it, through which the rotor shaft extends and has an annular groove formed on the inner side of the hole. A shaft sealing ring is accommodated within the sealing end cap, the shaft sealing ring facing the rotor shaft for sealing. The annular groove is axially located between the shaft sealing ring and the centrifugal disc.

2. The motor according to claim 1, characterized in that, The protective cover is fitted onto the bearing housing ring, and the protective cover is forcefully locked to the bearing housing ring.

3. The motor according to claim 1, characterized in that, At least one screw, screwed into a radially oriented threaded hole machined in the bearing retainer ring, presses the protective cover against the bearing retainer ring with its screw head.

4. The motor according to any one of claims 1-3, characterized in that, The annular groove's axis of rotation is coaxial with the rotor shaft's axis of rotation.

5. The motor according to any one of claims 1-3, characterized in that, A sealing end cap is accommodated at a hole centrally located in the bearing receiving ring, thereby covering the hole in the bearing receiving ring.

6. The motor according to any one of claims 1-3, characterized in that, The centrifugal disc is mounted on the rotor shaft and is forcefully locked to the rotor shaft.

7. The motor according to claim 5, characterized in that, The annular grooves are regularly spaced apart from each other in the axial direction.

8. The motor according to any one of claims 1-3, characterized in that, The protective cover is elastically pre-tightened and / or heat-pressed onto the bearing housing ring. and / or The protective cover is made of plastic.

9. The motor according to any one of claims 1-3, characterized in that, The rotor shaft extends through a notch in the base.

10. The motor according to any one of claims 1-3, characterized in that, The flange region is designed to be interrupted in the circumferential direction, having an interruption portion. The base component is connected to the stator housing. The area covered by the interrupted region in the circumferential direction overlaps with or is included by the area covered by the base component in the circumferential direction.

11. The motor according to claim 10, characterized in that, The area covered circumferentially by the base component and the area covered circumferentially by the flange region together are completely uninterrupted circumferentially.

12. The motor according to any one of claims 1-3, characterized in that, The axial direction is parallel to the rotation axis of the rotor shaft, the circumferential direction is based on the rotation axis, and the radial direction is also based on the rotation axis.

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