WO2022233544A1 - Druckausgleichsanordnung sowie elektrische maschine - Google Patents
Druckausgleichsanordnung sowie elektrische maschine Download PDFInfo
- Publication number
- WO2022233544A1 WO2022233544A1 PCT/EP2022/059752 EP2022059752W WO2022233544A1 WO 2022233544 A1 WO2022233544 A1 WO 2022233544A1 EP 2022059752 W EP2022059752 W EP 2022059752W WO 2022233544 A1 WO2022233544 A1 WO 2022233544A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chamber
- electrical machine
- recess
- component
- free end
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000009423 ventilation Methods 0.000 claims description 62
- 239000006260 foam Substances 0.000 claims description 5
- 230000009189 diving Effects 0.000 description 9
- 239000002775 capsule Substances 0.000 description 8
- 230000000149 penetrating effect Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000002847 sound insulator Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—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
- H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
- H02K2205/09—Machines characterised by drain passages or by venting, breathing or pressure compensating means
-
- 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
- H02K5/14—Means for supporting or protecting brushes or brush holders
-
- 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
- H02K5/14—Means for supporting or protecting brushes or brush holders
- H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
Definitions
- the invention relates to a pressure equalization arrangement for a chamber of an electrical machine in a motor vehicle and an electrical machine for a motor vehicle.
- DE 102017223491 A1 discloses an electric machine arrangement comprising two electric machines, each with a housing.
- Each housing has a machine space with a rotor-stator arrangement and a resolver space section that forms part of a resolver space that is formed between the machine spaces and is sealed off from the machine spaces.
- a number of pressure equalization elements assigned to the machine rooms and the resolver room are provided.
- the pressure compensation elements, via which the machine rooms can be vented, are arranged above a wading line, as seen in the vertical direction of the electric machine arrangement.
- the object of the present invention is to provide a solution which enables a chamber of an electrical machine to be vented in a particularly reliable manner with a particularly low risk of water penetrating the chamber of the electrical machine.
- the invention relates to a pressure equalization arrangement for a chamber of an electrical machine in a motor vehicle.
- the motor vehicle can be driven with electrical energy by means of this electrical machine.
- a ventilation pipe is connected to the chamber to be vented, via which gas can flow out of the chamber for pressure compensation.
- a free end of the ventilation pipe protrudes from below into a recess provided by a component and closed at the top, in which a gas bubble collects when the water level rises.
- the free end of the ventilation tube with a ventilation opening protrudes into this gas bubble.
- This further component thus provides a kind of diving bell for the vent opening, in order to ensure that when the water level around the electric machine rises, the vent opening of the vent pipe is reliably arranged in the glass bubble in the recess, thereby allowing water to flow into the chamber via the vent opening of the vent pipe can be at least substantially avoided.
- the component In the installed position in the motor vehicle, the component is arranged above the chamber in order to securely enclose the ventilation pipe, which adjoins the chamber to be vented at the top, in the recess for forming the diving bell. Due to the arrangement of the free end of the ventilation pipe in the recess, the free end of the ventilation pipe is surrounded at the top by the recess as if by a diving bell and is thus protected from the ingress of water.
- the pressure in the chamber can be equalized by the inflow or outflow of gas through the ventilation opening into the chamber or out of the chamber.
- the pressure equalization arrangement thus makes it possible to ensure pressure equalization in the chamber via the vent opening, with the chamber being particularly well protected from the ingress of water via the vent pipe at the same time by arranging the vent pipe in the recess of the component.
- the ventilation pipe represents a particularly simple and robust solution for pressure equalization in the chamber.
- the ventilation opening is arranged above a predetermined wading line.
- This wading line defines a maximum depth of water through which the motor vehicle can travel, and consequently for what depth of water the motor vehicle is designed.
- the chamber is a brush chamber of the electrical machine.
- brush elements can thus be in electrical contact with a rotating element, such as a shaft, in order to enable electrical energy to be transmitted via the brush elements.
- the brush chamber can, for example, be designed to be dry, in contrast to other areas of the electrical machine adjoining the chamber, which can be oil-lubricated or oil-cooled, for example. If a negative pressure occurs in the chamber, oil can be drawn into the chamber from the areas adjoining the chamber as a result of the negative pressure and thus contaminate the chamber.
- the pressure in the chamber can be equalized via the vent opening of the vent pipe, as a result of which the negative pressure in the chamber can be limited or, in particular, avoided. As a result, the entry of oil or other contaminants into the chamber from areas of the electrical machine adjoining the chamber can be at least essentially avoided.
- the brush space is assigned to a drive shaft of the electrical machine. Electrical energy for driving the drive shaft of the electrical machine can be provided via the brush elements of the brush space. It can thus be advantageous, in particular for safe driving of the drive shaft, if the chamber, which is the brush space of the electrical machine, is free of contamination such as dust and oil, in order to enable safe and reliable driving of the drive shaft.
- the component is an insulating component.
- This insulating component can in particular be a so-called acoustic capsule. In the installed position, this insulating component is arranged on an upper side of the electrical machine. The insulating component is thus arranged at least in regions above the chamber to be vented and provides the recess which encloses the venting pipe at the top.
- the provision of the recess in the insulating component makes it possible for a particularly large number of different Functions such as sound and/or thermal insulation of the electrical machine and preventing water from flowing into the chamber via the ventilation pipe are made possible. The provision of many different components for the respective functions in the electrical machine can thus be avoided.
- the component is provided from a foam, with a wall of the component delimiting the recess being gas-tight and water-tight.
- the component is designed to be particularly light and can also have insulating properties.
- the component can be produced from the foam as part of an injection molding process.
- the gas-tight and watertight wall of the component that delimits the recess ensures that water cannot penetrate via the component, in particular via the wall of the component that delimits the recess, into the diving bell formed by the recess around the free end of the ventilation pipe with particular can be avoided with great reliability.
- the ventilation opening of the ventilation pipe is particularly well protected against the ingress of water and at the same time against the gas bubble escaping.
- the recess in the component is provided by a bore in the component.
- the recess can thus be provided in a particularly simple manner.
- the recess can be provided with particularly little effort and the protection of the chamber against the ingress of water can thus be provided in a particularly reliable manner.
- the ventilation pipe is screwed or pressed onto an end shield of the electrical machine that delimits the chamber.
- the ventilation pipe can protrude outwards beyond a cover and/or bearing plate delimiting the chamber and is held particularly securely on this by the screw connection or by the compression.
- the ventilation pipe is fixed particularly securely in its orientation in the installed position, which in turn means that the free end of the ventilation pipe can be arranged particularly easily in the recess of the component when the pressure equalization arrangement is installed.
- the invention also relates to an electric machine for a motor vehicle, which is set up to drive the motor vehicle with electrical energy.
- This electric machine comprises a chamber with a venting pipe connected to the chamber to be vented and a component providing a recess closed at the top. Gas can flow out of the chamber through the vent pipe to equalize the pressure. Gas can also flow into the chamber via the vent pipe for pressure equalization. A free end of the ventilation pipe protrudes from below into the recess, with a ventilation opening arranged at the free end of the ventilation pipe protruding so far into the recess that the ventilation opening is arranged in a gas bubble collecting in the recess when the water level rises.
- the electrical machine thus has a pressure equalization arrangement as has already been described in connection with the pressure equalization arrangement according to the invention. Advantages and advantageous developments of the pressure equalization arrangement according to the invention are to be regarded as advantages and advantageous developments of the electrical machine and vice versa.
- the chamber is a brush chamber of the electrical machine and the electrical machine is designed as a wet-running electric motor.
- the brush space of the electric machine is dry when the electric machine is in operation. Wet areas of the electrical machine can be directly connected to the brush area.
- the ventilation pipe is provided, which enables pressure equalization of the brush room. As a result, pressure differences between wet areas of the electrical machine and the brush space can be limited, in particular avoided.
- the arrangement of the ventilation tube in the recess of the component can also prevent water from penetrating into the brush space via the ventilation opening of the ventilation tube.
- the brush space is particularly well protected against dirt, which means that a particularly long service life of the electrical machine can be achieved.
- Fig. 1 is a schematic sectional view of an electrical machine with a
- housing an end shield adjoining the housing and a housing cover, the housing cover enclosing a brush space as a chamber which is dry and which is sealed by a radial shaft sealing ring against a wet-operated rotor-stator space;
- Fig. 2 shows a schematic perspective view of the electrical machine with a vent pipe held on the end shield, which connects to the chamber to be vented, in this case the brush chamber, wherein the vent pipe can be used to equalize the pressure in the chamber and a free end of the vent pipe in an installed position downwardly open and upwardly closed recess of an insulating component of the electrical machine protrudes, as a result of which a ventilation opening arranged at the free end of the ventilation pipe is protected against the ingress of water according to a diving bell principle;
- Figures 3a and 3b show a schematic perspective view and a schematic
- Sectional view of the ventilation pipe which is arranged on the bearing plate and protrudes from below into the recess of the insulating component;
- FIG. 4 shows a further schematic sectional view of the ventilation tube which is held on the end shield and protrudes from below into the recess of the component and via which the pressure in the chamber can be equalized.
- an electrical machine 10 is shown in a schematic sectional view.
- the electrical machine 10 includes a rotor, not shown in FIG. 1 , and a stator, which are to be arranged in a wet-operated rotor-stator space 12 .
- This rotor-stator space 12 is delimited by a housing 14 of the electrical machine 10 .
- the electrical machine 10 also has a drive shaft 16 , one end of which opens into a brush chamber 18 of the electrical machine 10 .
- the drive shaft 16 can be electrically contacted via brush elements.
- the brush space 18 is formed by a chamber 22 delimited by a housing cover 20 of the electrical machine 10 . This brush room 18 is operated dry. Entry of oil or other liquids from the rotor-stator space 12 into the brush space 18 must be prevented in order to avoid damage to the brush elements.
- a radial shaft sealing ring 24 enclosing the drive shaft 16 is provided in the present case.
- this radial shaft sealing ring 24 is arranged in a B end shield 26 .
- This B end shield 26 is arranged between the housing 14 and the housing cover 20 .
- the housing cover 20 is thus supported against the housing 14 via the B end shield 26 .
- a pressure equalization arrangement 28 is provided, which equalizes the pressure of the chamber 22 with an environment of the electrical machine 10 allows.
- the pressure equalization assembly 28 can be seen in FIG. 2 , which shows the electric machine 10 in perspective. It can be seen here that a ventilation pipe 30 protrudes from the B end shield 26 .
- the vent tube 30 is provided here from aluminum. This ventilation pipe 30 protrudes upwards from the B end shield 26 in the installation direction.
- the vent tube 30 connects to the chamber 22 to be vented and is fluidly connected to it.
- a free end 32 of the ventilation pipe 30 protrudes into an insulating component 34, which in the present case is a so-called acoustic capsule. This insulating component 34 insulates the housing 14 of the electrical machine 10 at the top with regard to noise and/or heat.
- the insulating component 34 is provided from a polyurethane foam.
- the pressure compensation arrangement 28 is shown enlarged.
- the pressure compensation arrangement 28 is shown in a schematic sectional view.
- the vent pipe 30 fluidically connected to the chamber 22 to be vented protrudes with its free end 32 into a recess 36 of the insulating component 34 .
- This recess 36 encloses the free end 32 of the ventilation pipe 30 at the top.
- the ventilation pipe 30 thus dips into the recess 36 of the insulating component 34 from below.
- a gas bubble collects in the recess 36 based on the diving bell principle.
- the free end 32 of the ventilation pipe 30 is arranged in such a way that the free end 32 is arranged in the gas bubble collecting in the recess 36 when the water level rises. Pressure equalization of the chamber 22 is thus still possible via the free end 32 of the ventilation pipe 30 even when the water level around the electric machine 10 rises due to the arrangement of the free end 32 in the gas bubble collected in the recess 36 .
- a ventilation opening 38 of the ventilation tube 30, which is arranged at the free end 32, is arranged in a region of the recess 36 in which the gas bubble collects as the water level rises.
- the wall 40 delimiting the recess 36 is gas-tight and watertight.
- the recess 36 can already be provided when the insulating component 34 is produced, for example as part of an injection molding process, or can be introduced into the insulating component 34 after the insulating component 34 has been provided, in particular in the form of a bore.
- the insulating component 34 can be injection molded as a foam component.
- the ventilation pipe 30 can be screwed and/or pressed and/or glued to the B end shield 26.
- the pressure compensation arrangement 28 is shown in a further schematic sectional view. It can be seen here that the ventilation opening 38 is arranged above a predetermined wading line 42 of the electric machine 10 .
- the pressure equalization arrangement 28 described is based on the knowledge that engine systems, in particular both internal combustion engines and electric motors, have to meet requirements from a vehicle project and thus overriding system properties.
- a defined fording depth of the motor vehicle is to be made possible, which means that it is possible to drive through water up to a certain depth without the system being damaged.
- This is a customer-related requirement, which means that it occurs in practice in the hands of the customer.
- an IP 7 tightness test has to be fulfilled, which may be an approval requirement in some countries.
- a chamber in this case chamber 22, is to be vented, which can heat up during operation of electrical machine 10, as a result of which the air in chamber 22 expands, the aforementioned conditions such as the IP 7 leak test and the Enabling the defined wading depth to be fulfilled according to the situation.
- the ventilation opening 38 of the chamber and thus a permanent opening of the chamber 22 to the outside can be placed above a certain height predetermined by the wading depth, so that water cannot reach the ventilation opening 38 when crossing water.
- the entire electrical machine 10 is to be immersed, so that moving the ventilation opening 38 further up does not appear to make sense in order to meet this requirement.
- float valves are used, which close at a specified water level, or a combination of a one-way valve and membranes. If these valves are used, they must be protected against dust both from outside and from the chamber 22 to be vented, or they must be designed to be sufficiently robust. Valves or membranes are usually integrated into attachable adapters, which require additional space in the installation space. Appropriately designed adapters are often special geometries due to space problems and are therefore not standard parts, which drives up the costs for these parts disproportionately. In the case of the pressure equalization arrangement 28, the acoustic capsule and thus the insulating component 34 are used, which has the recess 36 on its underside, which is a pocket.
- the insulating component 34 offers a cap or a diving bell for the free end 32 of the ventilation pipe 30 that is inserted into the recess 36 from below, the free end 32 being received in the recess 36 .
- This can create a diving bell around the ventilation opening 38 arranged at the free end 32, which means that when the electrical machine 10 is immersed as part of an IP 7 tightness test, at least essentially no water penetrates into the chamber 22.
- ventilation of the chamber 22 that is suitable for IP7 can be implemented without the use of additional components and the available installation space.
- This pressure compensation arrangement 28 described is particularly robust, in particular in comparison to solutions with valve-diaphragm concepts.
- the ventilation opening 38 is arranged on or above the predetermined wading line 42 in the installation position.
- the pocket, in this case the recess 36, is arranged in the acoustic capsule, in which the free end 32 of the ventilation pipe 30 is accommodated. If the electrical machine 10 is submerged under water, water is then prevented from penetrating into the ventilation pipe 30 via the ventilation opening 38 according to the diving bell principle.
- the vent tube 30 points upwardly from a top of the chamber 22 .
- the free end 32 of the ventilation pipe 30 penetrates from below into an original installation space of the acoustic capsule.
- the acoustic capsule is provided with the aforementioned recess 36 in order to allow the free end 32 of the ventilation pipe 30 to dip into the recess 36 .
- the acoustic capsule is used in particular as a sound insulator and to keep the housing 14 of the electrical machine warm. As a result, a particularly good degree of efficiency can be achieved due to the insulation of the electrical machine 10 and a heat balance of the electrical machine 10 can be set particularly well.
- the moist rotor shaft is sealed off from the brush chamber 18 by means of the radial shaft sealing ring 24 .
- the brush chamber 18 in particular pieces of carbon are arranged as brush elements, which can produce abrasion during operation of the electrical machine 10 . If this abrasion comes into contact with oil, a short circuit can occur electrical machine 10 take place.
- the pressure compensation arrangement 28 can be used to prevent oil from penetrating the rotor-stator space 12 into the brush space 18 in a particularly reliable manner.
- the invention shows how an acoustic capsule, in this case the insulating component 34, can provide the integrated housing, in this case the recess 36, for a pressure equalization element, in this case the ventilation pipe 30.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280017617.7A CN116964911A (zh) | 2021-05-07 | 2022-04-12 | 压力平衡装置以及电机 |
EP22722706.3A EP4335021A1 (de) | 2021-05-07 | 2022-04-12 | Druckausgleichsanordnung sowie elektrische maschine |
US18/283,140 US20240178716A1 (en) | 2021-05-07 | 2022-04-12 | Pressure Equalization Arrangement and Electric Machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021111907.3A DE102021111907A1 (de) | 2021-05-07 | 2021-05-07 | Druckausgleichsanordnung sowie elektrische Maschine |
DE102021111907.3 | 2021-05-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022233544A1 true WO2022233544A1 (de) | 2022-11-10 |
Family
ID=81603660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/059752 WO2022233544A1 (de) | 2021-05-07 | 2022-04-12 | Druckausgleichsanordnung sowie elektrische maschine |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240178716A1 (de) |
EP (1) | EP4335021A1 (de) |
CN (1) | CN116964911A (de) |
DE (1) | DE102021111907A1 (de) |
WO (1) | WO2022233544A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022130666A1 (de) | 2022-11-21 | 2024-05-23 | Bayerische Motoren Werke Aktiengesellschaft | Kraftfahrzeug mit einer E-Antriebseinheit und E-Antriebseinheit für ein Kraftfahrzeug |
DE102023109140A1 (de) | 2023-04-12 | 2024-10-17 | Bayerische Motoren Werke Aktiengesellschaft | Maschinengehäuse mit einer Druckanpassungsvorrichtung, Maschine und Kraftfahrzeug sowie Verfahren zum Ändern einer Druckdifferenz zwischen zwei Maschinenkammern |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2679515A1 (de) * | 2008-12-31 | 2014-01-01 | W.L. Gore & Associates GmbH | Lüftungsvorrichtung |
US9809186B2 (en) * | 2013-12-02 | 2017-11-07 | Honda Motor Co., Ltd. | Vehicle |
DE102017223491A1 (de) | 2017-12-21 | 2019-06-27 | Audi Ag | Elektromaschinenanordnung |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4014145B2 (ja) | 2002-08-02 | 2007-11-28 | 本田技研工業株式会社 | 自動車用パワートレンのブリーザ装置 |
JP4341577B2 (ja) | 2005-04-25 | 2009-10-07 | トヨタ自動車株式会社 | 車両駆動装置 |
US20080099258A1 (en) | 2006-10-26 | 2008-05-01 | Berhan Michael T | Vented sealed housing assembly for vehicle powertrain |
DE102019126269A1 (de) | 2019-09-30 | 2021-04-01 | Audi Ag | Druckausgleichsanordnung |
-
2021
- 2021-05-07 DE DE102021111907.3A patent/DE102021111907A1/de active Pending
-
2022
- 2022-04-12 US US18/283,140 patent/US20240178716A1/en active Pending
- 2022-04-12 WO PCT/EP2022/059752 patent/WO2022233544A1/de active Application Filing
- 2022-04-12 EP EP22722706.3A patent/EP4335021A1/de active Pending
- 2022-04-12 CN CN202280017617.7A patent/CN116964911A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2679515A1 (de) * | 2008-12-31 | 2014-01-01 | W.L. Gore & Associates GmbH | Lüftungsvorrichtung |
US9809186B2 (en) * | 2013-12-02 | 2017-11-07 | Honda Motor Co., Ltd. | Vehicle |
DE102017223491A1 (de) | 2017-12-21 | 2019-06-27 | Audi Ag | Elektromaschinenanordnung |
Also Published As
Publication number | Publication date |
---|---|
DE102021111907A1 (de) | 2022-11-10 |
EP4335021A1 (de) | 2024-03-13 |
CN116964911A (zh) | 2023-10-27 |
US20240178716A1 (en) | 2024-05-30 |
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