CN114696514A - Electric machine with a stator housing and a rotor shaft - Google Patents
Electric machine with a stator housing and a rotor shaft Download PDFInfo
- Publication number
- CN114696514A CN114696514A CN202011624653.9A CN202011624653A CN114696514A CN 114696514 A CN114696514 A CN 114696514A CN 202011624653 A CN202011624653 A CN 202011624653A CN 114696514 A CN114696514 A CN 114696514A
- Authority
- CN
- China
- Prior art keywords
- rotor shaft
- electric machine
- bearing
- receiving ring
- bearing receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001681 protective effect Effects 0.000 claims abstract description 44
- 238000007789 sealing Methods 0.000 claims abstract description 43
- 230000007423 decrease Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention relates to an electric machine having a stator housing and a rotor shaft, wherein a sealing end cap is connected, in particular non-rotatably connected, to the stator housing, wherein a bearing for rotatably mounting the rotor shaft is accommodated in the sealing end cap, wherein a centrifugal disk is connected to the rotor shaft in a non-rotatable manner, wherein a protective cap is connected to the sealing end cap, wherein the protective cap covers the centrifugal disk, wherein the rotor shaft protrudes through a recess of the protective cap.
Description
Technical Field
The invention relates to an electric machine having a stator housing and a rotor shaft.
Background
It is generally known that electric motors have a rotor shaft which is rotatably supported relative to a stator housing of the electric motor.
Disclosure of Invention
The object of the invention is therefore to improve the service life of electric machines used in industrial fields.
According to the invention, this object is achieved by an electric machine according to the features given in claim 1.
In the case of an electric machine having a stator housing and a rotor shaft, an important feature of the invention is that the bearing cap is connected, in particular non-rotatably connected,
wherein the bearing cap has a seal end cap and a bearing receiving ring connected to the seal end cap,
wherein a bearing for rotatably supporting the rotor shaft is accommodated in the bearing accommodating ring,
wherein the centrifugal disc is connected with the rotor shaft in a non-rotatable manner,
wherein the protective cover is connected with the bearing containing ring,
wherein the protective cover covers the centrifugal disc,
wherein the rotor shaft protrudes through the recess of the protective cover.
The advantage here is that a high protection level 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 ensured. Liquid particles which have penetrated from the surroundings are thrown off by the centrifugal disk, collected by the protective hood and guided downwards and discharged at the interruption in the flange region of the protective hood. Furthermore, the protective cap is slipped onto the bearing receiving ring and is thereby connected in a sealing manner. A gap-free connection is preferably produced between the sealing end cap and the protective cap.
In an advantageous embodiment, a shaft sealing ring is accommodated in the end cover, which shaft sealing ring seals against the rotor shaft or forms a seal with respect to the rotor shaft. The sealing end cover can be centered in the bearing receiving ring in such a way that the shaft sealing ring received in the sealing end cover can be centered and arranged as precisely as possible with respect to the rotor shaft.
In an advantageous embodiment, the protective cap is placed over the bearing receiving ring, in particular wherein the protective cap is connected to the bearing receiving ring in a force-fitting/friction-fitting manner. The advantage here is that the protective cap can be positioned as precisely as possible relative to the bearing receiving ring and thus relative to the bearing received therein.
In an advantageous embodiment, at least one screw, which is screwed into a radially directed threaded bore formed in the bearing receiving ring, presses the protective cap with its screw head against the bearing receiving ring. The positive fixing by means of the screws additionally ensures the secure force-locking connection between the protective cap and the bearing cover, in particular the bearing receptacle.
In an advantageous embodiment, the end closure has a bore, in particular a bore arranged centrally in the end closure, through which the rotor shaft projects and on the inside of which an annular groove is formed,
wherein the ring axis of the annular groove is oriented coaxially with the rotational axis of the rotor shaft. The advantage here is that the annular gap which is present between the rotor shaft and the end shield has a variable, in particular periodically varying, radial extent in the axial direction. Thus, a labyrinth is created for particles entering from the outside, which labyrinth appears as a large obstacle due to the flow area/flow field created in the annular gap.
In an advantageous embodiment, a sealing end cap is received at a bore of the bearing receiving ring, in particular at a bore arranged centrally in the bearing receiving ring, in particular the sealing end cap thus covering the bore of the bearing receiving ring. The advantage here is that the sealing end cover can be positioned and connected to the bearing receiving ring in such a way that the orientation of the shaft sealing ring relative to the rotor shaft is optimized.
In an advantageous embodiment, the centrifugal disk is mounted on the rotor shaft, in particular is connected to the rotor shaft in a force-fitting manner. The advantage here is that the centrifugal disk is connected with the rotor shaft in a force-fitting manner and therefore the electric motor can be produced simply and quickly.
In an advantageous embodiment, the annular grooves are spaced apart from one another in the axial direction, in particular regularly spaced apart from one another in the axial direction. The advantage here is that an annular gap can be formed between the rotor shaft and the end shield, which has a variable, in particular periodically varying, radial thickness. The flow field in the annular gap which can be produced in this way can be designed in such a way that particles cannot easily enter the interior of the electric machine. This applies in particular to mists which occur in the environment of the engine and contain liquid particles.
In an advantageous embodiment, the protective cap is pressed onto and/or shrink-fitted onto the bearing receiving ring with a spring bias. The advantage here is that a simple sealing connection can be established.
In an advantageous embodiment, the protective cap is made of plastic. The advantage here is that a cost-effective production of the protective cap can be achieved and that a low force is required for the connection.
In an advantageous embodiment, the protective hood has a plate-like, in particular perforated, base body,
in particular, wherein the rotor shaft projects through a recess of the base body,
in particular wherein the extension of said plates in the radial direction is at least ten times greater than the axial extension,
in this case, a flange region, in particular an axial projection, is formed on the radial outer edge of the plate-shaped base body. The advantage here is that the flange region can be slipped onto the bearing receiving ring and can therefore be connected in a sealing manner and with low force consumption.
In an advantageous embodiment, the region covered by the flange region in the axial direction comprises a region covered by the centrifugal disk in the axial direction and a region covered by the sealing end cover in the axial direction, and in particular a region covered by the bearing receiving ring in the axial direction. The advantage here is that the protective hood surrounds and/or covers the centrifugal disk and the sealing end cap together with the annular gap and the shaft sealing ring accommodated in the sealing end cap in such a way that a housing is formed.
In an advantageous embodiment, the flange region is interrupted in the circumferential direction, in particular with an interruption,
wherein the base part is connected with the stator shell,
wherein the interruption region circumferentially covers a region that overlaps or is comprised by a region circumferentially covered by the chassis component. In this case, it is advantageous that the interruption region is oriented downward in the direction of the base part, i.e. in the direction of gravity, and thus enables the liquid that has entered and is thrown off by the centrifugal disk to flow out.
In an advantageous embodiment, the region circumferentially covered by the base part and the region circumferentially covered by the flange region together are completely uninterrupted in the circumferential direction. The advantage here is that the interruption region is oriented downwards in the direction of the base part, i.e. in the direction of gravity, and can thus cause the liquid that has entered and is thrown off by the centrifugal disk to flow out.
In this description, the axial direction is parallel to the direction of the axis of rotation of the rotor shaft and the circumferential direction is referenced to this axis of rotation, in particular wherein the radial direction is also referenced to this axis of rotation.
In an advantageous embodiment, the axial wall thickness, in particular the axial width, of the centrifugal disk decreases monotonically with increasing radial distance, in particular radially outward. In this case, the advantage is that the centrifugal disk projects into a lateral recess/undercut formed on the sealing end cap, which is located radially inside.
In an advantageous embodiment, the axial region covered by the centrifugal disk overlaps the axial region covered by the sealing end cap. In this case, it is advantageous if the centrifugal disk projects into a recess, in particular a lateral recess, of the sealing end cap, which recess is open, in particular in the axial direction.
Further advantages emerge from the dependent claims. The invention is not limited to the combination of features of the claims. Further meaningful combination possibilities of the features of the claims and/or of the individual claims and/or of the description and/or of the drawings can be derived by the person skilled in the art, especially from the objects set forth and/or compared with the prior art.
Drawings
The invention will now be explained in detail with the aid of a schematic drawing.
Fig. 1 shows a part of an electric machine according to the invention shown in section.
In fig. 2, an area of fig. 1 is shown enlarged.
Fig. 3 shows a protective housing 1 of an electric machine in an oblique view.
Fig. 4 shows the centrifugal disk 2 of the electric motor in an oblique view.
Fig. 5 shows the end cap 3 of the electric machine in an oblique view.
Fig. 6 shows the shaft sealing ring 4 of the electric machine in an oblique view.
Fig. 7 shows a partial sectional view of the electric machine.
Fig. 8 shows a detail of fig. 7 in an enlarged manner.
Fig. 9 shows a detail of fig. 7 in an oblique view.
List of reference numbers:
1 protective cover
2 centrifugal disc
3 sealing end cap
4-shaft sealing ring
5 rotor shaft
6 stator housing
7 base part
50 ring groove
70 bearing receiving ring
Detailed Description
As shown, the electric machine has a rotor shaft 5 which is supported by bearings so as to be rotatable relative to a stator housing 6 of the electric machine.
The stator housing has annular cooling fins which are spaced apart, in particular regularly spaced apart, from one another in the axial direction, i.e. in the direction of the rotational axis of the rotor shaft 5. That is, the fins protrude in the radial direction, and thus enable the liquid to be quickly led out. The extension of the cooling fins in the axial direction is smaller than in the radial direction. The fins are designed to be uninterrupted in the circumferential direction.
The bearing of the rotor shaft 5 is accommodated in a bearing receiving ring 70, which is connected, in particular non-rotatably connected, to the stator housing 6. The end shield 3 is accommodated in a centrally arranged bore in the bearing receiving ring, in particular it therefore covers the bore, but itself has a further bore through which the rotor shaft 5 projects.
In the end cover 3, a shaft sealing ring 4 is accommodated, the sealing lips of which run on the finished surface region of the rotor shaft 5, in particular thus sealing against the rotor shaft 5.
Furthermore, the end shield 3 has a central bore through which the rotor shaft projects and on the inside of which a plurality of annular grooves 50 are formed.
The ring axis of the annular groove is oriented coaxially with the rotational axis of the rotor shaft 5. The individual annular grooves are spaced apart from one another in the axial direction, in particular regularly spaced apart from one another in the axial direction.
On the side of the end cover 3 facing away from the shaft sealing ring 4, the centrifugal disk 2 is connected to the rotor shaft 5 in a rotationally fixed, in particular non-positive manner.
A protective cap 1 having a centrally arranged recess through which the rotor shaft 5 projects is fitted on the bearing receiving ring 70. A narrow gap is formed between the rotor shaft 5 and the protective cap 1, which is connected in a rotationally fixed manner to the bearing receiving ring 70.
The protective hood 1 has a plate-like, in particular perforated plate-like base body with a recess through which the rotor shaft 5 projects. A flange region is formed on the radially outer edge of the plate-like base body, which flange region extends in the axial direction.
The region covered by the flange region in the axial direction includes a region covered by the seal cover 3 and by the bearing housing ring 70 in the axial direction. Thus, the end shield 3 as well as the bearing receiving ring 70 are covered to prevent the ingress of dirt particles from the external environment.
The flange region has an interruption in the circumferential direction, wherein the protective cover is oriented relative to the electric machine such that: so that the interruption is open downwards. The amount of liquid thrown off by the centrifugal disk 2 can therefore flow down on the inner side of the protective cover 1 to the interruption and from there out to the surroundings.
The base part 7, in particular the base plate, is screwed or integrally, in particular integrally, cast on the underside of the stator housing 6.
The area circumferentially covered by the seat part 7 comprises or overlaps the area circumferentially covered by the sole interruption. The flange region has no further interruptions, except for the interruptions. The flange region can therefore be produced sufficiently stably and rigidly.
The flange region has a rounded partial region and a flat further partial region. The flat region is oriented vertically and enables a particularly rapid outflow of liquid. The rounded area directs the exiting liquid downwards.
The protective cap 1 is fixed to the bearing receiving ring 70 by means of at least one radially directed screw. For this purpose, screws project through the protective cap 1, wherein the threaded regions of the screws are screwed into radially directed threaded holes formed in the bearing receiving ring 70 and the screw heads of the screws press the protective cap 1 against the bearing receiving ring 70.
The region covered by the protective cover 1 in the axial direction includes the region covered by the centrifugal disk 2 in the axial direction and overlaps the region covered by the sealing end cover 3 in the axial direction, but in particular also the region covered by the bearing receiving ring 70 in the axial direction.
Preferably, the protective cap 1 is made of plastic and is thus pressed onto the bearing receiving ring 70 with a spring bias. In this case, the flange region is expanded to generate the elastic pretensioning and presses the protective cap 1 against the bearing receiving ring 70.
In order to form a radially directed labyrinth, the axial area covered by the centrifugal disk 2 overlaps the axial area covered by the sealing end cover 3. For this purpose, the centrifugal disk 2 has, in its radially inner region, a widening in the axial direction, which can be referred to as a base ring, on which an axially thinner disk is formed, wherein the centrifugal disk 2 is formed in one piece, in particular in one piece. The axial wall thickness, i.e. in particular the axial width, decreases monotonically with increasing radial distance.
In a further embodiment according to the invention, the flange region consists of planar, mutually adjoining face regions. In this case, the surface regions adjoining one another preferably always have the same angle as one another.
In a further embodiment according to the invention, the recess formed in the protective cap 1 and arranged centrally in the protective cap is connected to the interruption, so that the recess arranged centrally in the protective cap opens into the interruption. In this way, material can be saved and simple production can be achieved.
Claims (15)
1. An electric machine having a stator housing and a rotor shaft,
the bearing cap is connected, in particular non-rotatably connected, to the stator housing,
the bearing cover is provided with a sealing end cover (3) and a bearing containing ring (70) connected with the sealing end cover (3),
wherein a bearing for rotatably supporting the rotor shaft is accommodated in the bearing accommodating ring (70),
it is characterized in that the preparation method is characterized in that,
the centrifugal disk is connected with the rotor shaft in a non-rotatable manner,
a protective cover is coupled to the bearing receiving ring,
the centrifugal disc is covered by the protective cover,
the rotor shaft protrudes through the recess of the protective cover.
2. An electric machine according to claim 1, characterized in that a shaft sealing ring is accommodated in the sealing end cap, which shaft sealing ring seals towards the rotor shaft.
3. The electrical machine of one of the preceding claims, wherein the protective hood is placed over the bearing receiving ring, in particular is connected to the bearing receiving ring in a force-fitting manner.
4. An electric machine according to any of the preceding claims, characterized in that at least one screw which is screwed into a radially directed threaded bore which is formed in the bearing receiving ring presses the protective cap with its screw head against the bearing receiving ring.
5. An electric machine according to any of the preceding claims,
the sealing end cover has a bore, which is arranged in particular centrally in the sealing end cover, through which the rotor shaft protrudes and on the inner side of which an annular groove is formed,
the ring axis of the annular groove is oriented coaxially with the rotational axis of the rotor shaft.
6. The electrical machine of one of the preceding claims, wherein a sealing end cap is received at a bore of the bearing receiving ring, in particular at a bore centrally arranged in the bearing receiving ring, in particular whereby the sealing end cap covers the bore of the bearing receiving ring.
7. An electric machine as claimed in one of the preceding claims, characterized in that the centrifugal disk is fitted on the rotor shaft, in particular is connected in a force-fitting manner to the rotor shaft.
8. An electric machine according to any of the preceding claims, wherein the annular grooves are axially spaced apart from each other, in particular are regularly axially spaced apart from each other.
9. An electric machine according to any of the preceding claims,
the protective cap is pressed onto and/or shrink-fitted onto the bearing receiving ring with a resilient pretension,
and/or
The protective cover is made of plastic.
10. An electric machine according to any of the preceding claims,
the protective hood has a plate-shaped, in particular perforated, base body,
in particular the rotor shaft protrudes through a recess of the basic body,
a flange region, in particular, projecting axially, is formed on the radially outer edge of the plate-shaped base body.
11. An electric machine according to any of the preceding claims, characterized in that the area covered by the flange area in the axial direction comprises the area covered by the centrifugal disc in the axial direction and comprises the area covered by the sealing end cover in the axial direction and the area covered by the bearing receiving ring in the axial direction.
12. An electric machine according to any of the preceding claims,
the flange region is designed to be interrupted in the circumferential direction, in particular with an interruption,
the base member is connected to the stator housing,
the area circumferentially covered by the interruption zone overlaps with or is comprised by the area circumferentially covered by the chassis component.
13. A machine as claimed in any one of the preceding claims, characterized in that the area circumferentially covered by the base part and the area circumferentially covered by the flange area together are completely uninterrupted in the circumferential direction.
14. An electric machine according to any of the preceding claims, characterized in that the axial direction is parallel to the direction of the axis of rotation of the rotor shaft, the circumferential direction being referenced to the axis of rotation, in particular the radial direction also being referenced to the axis of rotation.
15. An electric machine according to any of the preceding claims,
the axial wall thickness of the centrifugal disk, in particular the axial width, decreases monotonically with increasing radial distance,
and/or
The axial area covered by the centrifugal disk overlaps with the axial area covered by the sealing end cover.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011624653.9A CN114696514A (en) | 2020-12-30 | 2020-12-30 | Electric machine with a stator housing and a rotor shaft |
| EP21823767.5A EP4272299A1 (en) | 2020-12-30 | 2021-11-30 | Electric motor having a stator housing and a rotor shaft |
| PCT/EP2021/025474 WO2022144088A1 (en) | 2020-12-30 | 2021-11-30 | Electric motor having a stator housing and a rotor shaft |
| DE102021005937.9A DE102021005937A1 (en) | 2020-12-30 | 2021-11-30 | Electric motor with a stator housing and a rotor shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011624653.9A CN114696514A (en) | 2020-12-30 | 2020-12-30 | Electric machine with a stator housing and a rotor shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114696514A true CN114696514A (en) | 2022-07-01 |
Family
ID=82133836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011624653.9A Pending CN114696514A (en) | 2020-12-30 | 2020-12-30 | Electric machine with a stator housing and a rotor shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114696514A (en) |
-
2020
- 2020-12-30 CN CN202011624653.9A patent/CN114696514A/en active Pending
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