WO2022229340A1 - Gehäuse für eine elektrische maschine mit einem verstärkungselement - Google Patents
Gehäuse für eine elektrische maschine mit einem verstärkungselement Download PDFInfo
- Publication number
- WO2022229340A1 WO2022229340A1 PCT/EP2022/061378 EP2022061378W WO2022229340A1 WO 2022229340 A1 WO2022229340 A1 WO 2022229340A1 EP 2022061378 W EP2022061378 W EP 2022061378W WO 2022229340 A1 WO2022229340 A1 WO 2022229340A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- reinforcing element
- edge
- inner ring
- end shield
- Prior art date
Links
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 238000003698 laser cutting Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 description 19
- 238000005266 casting Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000004512 die casting Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
-
- 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
- H02K5/06—Cast metal casings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/14—Casings; Enclosures; Supports
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/02—Casings or enclosures characterised by the material thereof
-
- 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
- H02K5/15—Mounting arrangements for bearing-shields or end plates
Definitions
- the invention relates to a housing for an electrical machine, with a housing shell in the form of a hollow cylinder and a circular bearing plate made of a first material, which is arranged at an axial end of the housing shell.
- the end shield can be produced, for example, as a circular or ring-shaped cast part that at least partially closes the housing shell in an axial direction and thus forms an end face of the housing.
- the end shield can carry a bearing bush for a roller bearing, which accommodates the rotor shaft of a rotor arranged in the housing.
- the rotor shaft can protrude through a central hole in the end shield, in which the bearing bush is arranged.
- a stator can be accommodated in the housing, with the rotor being rotatable with respect to the stator.
- a further end shield can be provided, which closes the housing jacket in the opposite axial direction and can carry a further bearing of the rotor.
- Electric machines of this type are increasingly being used in electrically powered vehicles and hybrid vehicles, primarily as electric motors for driving a wheel or an axle of such a vehicle.
- the electric motor can be designed, among other things, as a synchronous motor or an asynchronous motor.
- the electric motor is usually mechanically coupled to a gear for speed adjustment.
- the electric motor is usually electrically connected to an inverter, which generates an AC voltage for the operation of the electric motor from a DC voltage supplied by a battery, for example a polyphase AC voltage.
- the electrical machine it is also possible to operate the electrical machine as a generator for recuperating kinetic energy from a vehicle, with the kinetic energy first being converted into electrical energy and then into chemical energy from the battery.
- the aim is to produce the above-mentioned housing, in particular the bearing plate, with walls that are as thin as possible. If the wall thickness of the housing is reduced, however, the tendency of the electric machine to vibrate as a function of the speed increases.
- reinforcing ribs In order to avoid the occurrence of vibrations, it has already been proposed to provide reinforcing ribs on the end shield.
- reinforcing ribs of this type require additional installation space, which is not available for every application of the electrical machine.
- the manufacture of the housing with the reinforcing ribs becomes more complicated and therefore more expensive.
- the invention is therefore based on the object of specifying a housing for an electrical machine in which undesired vibrations are avoided without requiring additional installation space.
- a reinforcing element made of a second material is embedded in the end shield.
- the invention is based on the knowledge that the different properties of a first material and a second material can be combined in an advantageous manner can be combined to increase the rigidity of a component. Furthermore, the embedding of the reinforcement element in the bearing plate enables the two components to be connected when the bearing plate is cast, so that there is no need for complex assembly of the two components.
- the first material may have a lower density than the second material.
- the second material can have a higher modulus of elasticity than the first material. This results in a particularly high rigidity of the end shield, which means that the housing is less susceptible to vibration, especially at low speeds of a rotor of the electrical machine.
- the housing jacket defines a (virtual) axial axis, along which a first axial direction and an opposite second axial direction run. Starting from the axial axis, a number of radial directions can also be defined, each of which emanates at right angles from the axial axis of the housing casing.
- the housing shell is preferably formed in one piece with the end shield, that is to say as an integral component. This eliminates the need to assemble the two components.
- a thickness of the end shield is preferably between 5 and 6 mm, but can also have a different value, for example between 3 and 8 mm.
- the reinforcing element can surround a bearing bush that is also embedded in the end shield.
- the reinforcing element, bearing bush and end shield (or the remainder thereof) can be connected to one another in one step, namely when the end shield is cast.
- the bearing bush contributes to the rigidity of the end shield, which further reduces the tendency of the electric machine to vibrate.
- the bearing bush embedded in the end shield can be used to mount a rotor of the electrical machine.
- the reinforcing element surrounding the bearing bush can be spaced apart from the bearing bush.
- the rigidity of the end shield can be further increased by the reinforcing element being designed in the form of a ring with radially running struts.
- the struts each run outwards in a radial direction from a central region of the end shield.
- the ring-shaped reinforcement element can in particular have an inner ring and an outer ring surrounding the inner ring, with the struts connecting the inner ring to the outer ring.
- the inner ring can, for example, surround the bearing bush integrated in the end shield.
- the struts asymmetrically and/or at different distances from one another along the inner ring or the outer ring.
- the asymmetrical arrangement results in less strong excitation of the housing at certain natural frequencies of the rotor.
- the reinforcement element has a first edge region which protrudes in a first axial direction.
- the first edge area can be bent or angled in the first axial direction and bring about a further increase in the rigidity of the end shield.
- a partial area of the first edge area can extend at least approximately perpendicularly to a plane defined by the reinforcement element.
- the reinforcement element can have a second edge area, which protrudes in a second axial direction opposite to the first axial direction.
- the second edge region can be bent or angled in the second axial direction and a further increase in the Cause rigidity of the end shield.
- a partial area of the second edge area can extend at least approximately perpendicularly to the plane defined by the reinforcing element. The partial area of the first edge area and the partial area of the second edge area can thus run parallel to one another.
- the first edge area can also be located on the inner ring, in particular on the inner edge of the inner ring.
- the second edge area can be located on the outer ring, in particular on the inner edge of the outer ring, on the inner ring, in particular on the outer edge of the inner ring, and/or on an edge of one of the struts.
- the first edge area is on the outer ring of the outer ring and the inner edge of the inner ring, with the second edge area being on the inner edge of the outer ring, on the outer edge of the inner ring and on the edges of the struts.
- the first material can have or consist of an aluminum alloy.
- the second material can include or consist of a steel alloy. Because of the mix of materials, the case can be described as a "hybrid aluminum case".
- the invention relates to an electrical machine with a housing of the type described.
- a stator, a rotor and any other required components can be accommodated in the housing.
- the invention also relates to a vehicle that can be driven with such an electric machine.
- the vehicle can also have several such electrical machines, one of the machines being assigned to a wheel or an axle of the vehicle.
- the invention relates to a method for producing a housing of the type described with the following steps: positioning the reinforcement element made of the second material in a mold and pouring the first material into the mold so that the reinforcement element is surrounded by the first material.
- a die casting process can be used, although another type of casting process can also be used, for example gravity casting.
- the reinforcement element used for the method can have been produced, inter alia, by stamping, laser cutting and/or deep drawing.
- FIG. 1 is a perspective view of a case according to an embodiment of the invention looking at the inside thereof;
- Fig. 2 is another perspective view of the housing looking at its exterior
- Figure 3 is an axial view of a reinforcing element of the housing
- Fig. 4 is a perspective view of the reinforcement member
- Figure 5 shows a vehicle according to the invention.
- 1 is a perspective view of a case 1 according to an embodiment of the invention, looking at the inside thereof.
- the housing 1 belongs to an electric machine with which a vehicle is driven.
- the pot-shaped housing 1 has a housing shell 2 in the form of a hollow cylinder and a circular or ring-shaped bearing plate 3 which is arranged at a first axial end of the housing shell 2 .
- the housing shell 2 is formed in one piece with the end shield 3, so that both components form an integral part.
- the housing shell 2 and most of the end shield 3 are made of a first material, which is an aluminum alloy. However, instead of the aluminum alloy, another material can also be used.
- the end shield 3 includes, among other things, a bearing bush 5 which is arranged in a central hole in the end shield 3 .
- the bearing bush 5 is intended for receiving a roller bearing for the first end of a rotor shaft (not shown).
- the rotor shaft is part of a rotor of the electrical machine that is to be mounted in the housing 1 .
- the rotor shaft can pass through the bearing bush 5 so that it protrudes from the housing 1 and a gearbox can be attached to it.
- the bearing bush 5 consists of a second material, which is a steel alloy. It is surrounded by several reinforcing ribs, which extend radially from the bearing bush 5 on the inside of the end shield 3 . Furthermore, in the end shield 3 there are several peripheral holes 6,
- the housing 1 serves to accommodate a stator (not shown) in which the rotor can rotate.
- the housing 1 can be closed at its open axial end with a further end shield (not shown), which is referred to as a "cover".
- the cover can have a further bearing bush for receiving another roller bearing is intended for the second end of the rotor shaft.
- Fig. 2 is another view of the case 1 looking at its exterior.
- the outside of the end shield 3 shown in FIG. 2 is planar or flat, which limits the space required by the housing 1.
- FIG. 3 and 4 show a reinforcing element 8 which has an annular basic shape.
- Fig. 3 is an axial view and
- Fig. 4 is a perspective view of the reinforcing member 8.
- the reinforcing element 8 is ring-shaped with radially running struts 11 .
- it comprises an inner ring 9 and an outer ring 10 surrounding the inner ring 9 , which are connected to one another by the struts 11 .
- the reinforcing element 8 is embedded in the end shield 3 in such a way that the inner ring 9 surrounds the bearing bush 5 , the inner ring 9 being spaced apart from the bearing bush 5 .
- the reinforcement element 8 is embedded in the end shield 3 in such a way that the reinforcement element 8 is almost completely covered by the first material. As a result, the reinforcement element 8 is essentially not visible from the outside.
- the struts 11 are at least partially arranged irregularly or asymmetrically. As a result, the spaces between adjacent struts 11 differ in width.
- the outer ring 10 on its outer edge and the inner ring 9 on its inner edge each have a first edge region 12 which extends in a first axial direction, to the left in the illustration of FIG. 4 .
- the first edge region 12 is angled at right angles with respect to the (virtual) plane defined by the reinforcement element 8 .
- outer ring 10 on its inner edge, the inner ring 9 on its outer edge and the struts 11 on their edges each have a second edge region 13 which extends in a second axial direction opposite to the first axial direction, to the right in the illustration in FIG. 4 .
- the second edge region 13 is also angled at right angles with respect to the (virtual) plane defined by the reinforcement element 8 .
- the two edge areas 12, 13 point in opposite directions.
- the reinforcing element 8 consists of the second material, which is a steel alloy. However, the reinforcing element 8 can also consist of a different material.
- the housing 1 is manufactured as follows:
- the previously separately produced reinforcement element 8 is positioned in a mold.
- the reinforcing element 8 can be arranged on the bottom of the mold at a defined distance from the bottom. The distance corresponds to the thickness of a layer of the first material which is intended to cover the reinforcement element 8 on its outside.
- the reinforcing element 8 can be provided with a plurality of pins (not shown in FIG. 3, FIG. 4) on its underside, which support the reinforcing element 8 on the ground.
- the first material is poured into the mold in the molten state, so that the reinforcing element 8 is surrounded by the liquid first material.
- a die casting process can be used for this, or another casting process, for example a gravity casting process.
- the reinforcement element 8 was produced from sheet metal by stamping and/or laser cutting. In addition, the stamped part was deep-drawn, resulting in its three-dimensional shape.
- the end shield 3 Due to the shape and the material of the embedded reinforcement element 8, the end shield 3 has a high level of rigidity despite its small dimensions. Accordingly, the housing 1 of the electrical machine is characterized by a particularly low tendency to undesired oscillations or vibrations.
- FIG. 5 shows a vehicle 15 whose drive train includes the electric machine 14 which is equipped with the housing 1 and serves to drive an axle of the vehicle 15 .
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22726103.9A EP4331088A1 (de) | 2021-04-30 | 2022-04-28 | Gehäuse für eine elektrische maschine mit einem verstärkungselement |
KR1020237040589A KR20240001205A (ko) | 2021-04-30 | 2022-04-28 | 보강 요소를 구비한 전기 기계용 하우징 |
CN202280031743.8A CN117280573A (zh) | 2021-04-30 | 2022-04-28 | 具有加强元件的用于电机的容纳件 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021204329.1 | 2021-04-30 | ||
DE102021204329.1A DE102021204329A1 (de) | 2021-04-30 | 2021-04-30 | Gehäuse für eine elektrische Maschine mit einem Verstärkungselement |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022229340A1 true WO2022229340A1 (de) | 2022-11-03 |
Family
ID=81850754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/061378 WO2022229340A1 (de) | 2021-04-30 | 2022-04-28 | Gehäuse für eine elektrische maschine mit einem verstärkungselement |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP4331088A1 (de) |
KR (1) | KR20240001205A (de) |
CN (1) | CN117280573A (de) |
DE (1) | DE102021204329A1 (de) |
WO (1) | WO2022229340A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06105499A (ja) * | 1992-09-24 | 1994-04-15 | Toshiba Corp | 回転電機用軸受ブラケット |
JP2005027385A (ja) * | 2003-06-30 | 2005-01-27 | Mitsuba Corp | 封止構造 |
DE102013227056A1 (de) * | 2013-12-23 | 2015-06-25 | Robert Bosch Gmbh | Gehäuse und Lagerdeckel für eine elektrische Maschine mit einem eingespritzten Lager |
CN207719927U (zh) * | 2017-09-08 | 2018-08-10 | 重庆志成机械有限公司 | 一种带钢套的新能源汽车电机端盖 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB754361A (en) | 1954-06-11 | 1956-08-08 | Rade Koncar Tvornica Elek Cnih | Improvements in stators for dynamo-electric machines |
US6380645B1 (en) | 2000-05-11 | 2002-04-30 | General Electric Company | Cast motor end shield including insert and method for casting |
DE102008044246A1 (de) | 2008-12-02 | 2010-06-10 | Robert Bosch Gmbh | Lageranordnung |
-
2021
- 2021-04-30 DE DE102021204329.1A patent/DE102021204329A1/de active Pending
-
2022
- 2022-04-28 WO PCT/EP2022/061378 patent/WO2022229340A1/de active Application Filing
- 2022-04-28 EP EP22726103.9A patent/EP4331088A1/de active Pending
- 2022-04-28 KR KR1020237040589A patent/KR20240001205A/ko unknown
- 2022-04-28 CN CN202280031743.8A patent/CN117280573A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06105499A (ja) * | 1992-09-24 | 1994-04-15 | Toshiba Corp | 回転電機用軸受ブラケット |
JP2005027385A (ja) * | 2003-06-30 | 2005-01-27 | Mitsuba Corp | 封止構造 |
DE102013227056A1 (de) * | 2013-12-23 | 2015-06-25 | Robert Bosch Gmbh | Gehäuse und Lagerdeckel für eine elektrische Maschine mit einem eingespritzten Lager |
CN207719927U (zh) * | 2017-09-08 | 2018-08-10 | 重庆志成机械有限公司 | 一种带钢套的新能源汽车电机端盖 |
Also Published As
Publication number | Publication date |
---|---|
EP4331088A1 (de) | 2024-03-06 |
KR20240001205A (ko) | 2024-01-03 |
CN117280573A (zh) | 2023-12-22 |
DE102021204329A1 (de) | 2022-11-03 |
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