CN110504793A - For the coolant jacket of coolant circulation and electronic prime mover or working machine - Google Patents
For the coolant jacket of coolant circulation and electronic prime mover or working machine Download PDFInfo
- Publication number
- CN110504793A CN110504793A CN201910410596.5A CN201910410596A CN110504793A CN 110504793 A CN110504793 A CN 110504793A CN 201910410596 A CN201910410596 A CN 201910410596A CN 110504793 A CN110504793 A CN 110504793A
- Authority
- CN
- China
- Prior art keywords
- coolant
- shell
- coolant jacket
- inner casing
- diversion member
- 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
- 239000002826 coolant Substances 0.000 title claims abstract description 129
- 239000012530 fluid Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 38
- 230000000694 effects Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002918 waste heat 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
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
Abstract
The present invention relates to a kind of for electronic prime mover or the coolant jacket for coolant circulation of working machine, the coolant jacket have inner casing (2) and shell, the annular gap that the inner casing and shell are surrounded between each other for coolant circulation.The diversion member (5) of multiple parallel arrangements is disposed in annular gap, the diversion member extends in annular gap on inner casing (2) and the circumferential direction of shell and annular gap is divided into multiple annular chambers (6a, 6b).Each diversion member (5) has perforation (7), coolant flow (KS) enters the second annular chamber (6b) from first annular chamber (6a) by the perforation, so that (7) formation of perforating is used for the overflow openings of coolant.
Description
Technical field
The present invention relates to a kind of coolant jacket for coolant circulation for prime mover or working machine, the coolings
Tackling has the entrance and exit for coolant and has inner casing and shell, and the inner casing and shell surround between each other can
For the annular gap of coolant circulation, and there is at least one to be arranged in the diversion member in annular gap, the water conservancy diversion member
Part extends in annular gap on the circumferential section of inner casing and/or shell and annular gap is divided at least two annulars
Chamber.The invention further relates to electronic prime mover or working machine of a kind of driving machine as motor vehicle equipped with this coolant jacket
Tool.
Background technique
In order to improve the power of this motor and carry out active cooling to this motor, especially using flow path
Coolant jacket.The hitherto known cooling solution for motor is based on making liquid coolant radially or flows axially through cooling
Set or cooling line.Here, coolant jacket extracts waste heat from motor, so as to ensure on higher power level without reason
The operation of barrier.
As coolant usually using the mixture or other coolant liquids appropriate being made of water and ethylene glycol or oil.
The longitudinal axis that cooling duct is for example parallel to shell extends, and the longitudinal axis is parallel to the axis driven by electric drive again.It is cooling
Set is configured to the double walled being made of inner casing and shell, therefore coolant can flow through annular gap.Coolant is cold from one
But agent channel to another adjacent coolant channel turn to can the end side of motor or electric machine casing with shell phase
It is carried out in individual housing member even.It is also known that multiple cooling ducts are arranged in annular gap, multiple cooling is logical
Road guarantees that coolant presses defined flowing, thus to optimize heat discharge.
A kind of shell as known to 10 2,012 221 886 A1 of DE surrounds the stator and/or rotor for being used for motor.Shell
The cooling chamber of annular in body defines the circular fluid path around stator or rotor.Separator or rib are positioned to,
So that they hinder alternately to flow on the first axis side of the cooling chamber of annular and the second axial side.
In 10 2,012 223 372 A1 of DE, the coolant channel of the annular of motor is in coolant entrance and coolant
There is the shim at least partly extended on the axial length of coolant channel in the region of outlet.
A kind of coolant jacket for being mounted on the periphery of stator as known to 10 2,013 213 433 A1 of DE, wherein In
There are the cavitys of fillable liquid cooling medium between the outer wall of coolant jacket and the inner wall of shell, wherein axially extending barrier
Element is for spatially separating entrance area and exit region.
WO 2015/176703A1 is related to the coolant jacket on a kind of outside for being mounted on motor, and the coolant jacket has
Multiple cooling fins circumferentially, form coolant channel between the cooling fin, and coolant flow supercooling agent is logical
Road and it is possible thereby to cooling fin is streamed in large area.Divide cooling space, form Fluid Sealing as on coolant jacket
The barrier element of shim is circumferentially substantially fluid tightly separated from one another by entrance area and exit region, therefore passes through
The entire circumferential direction of coolant jacket is forcibly streamed into the cooling medium of opening input.
A kind of coolant jacket for prime mover is described in 10 2,012 002 024 B3 of DE, wherein lead in internal
Sandwich-like cooling shell is disposed between the covering shell of heat and the covering shell of outside.The cooling shell includes the cooling of meander shape
Channel has the pectination piece for the ground arrangement that offsets, therefore the coolant inputted is not only entering one between opening and outflow opening
It is directed through to secondary property entire circumferential direction, but by pectination piece along the direction of the rotation axis for being parallel to prime mover opposite respectively
It turns to.
A kind of cooling device for engine as known to 199 50 660 A1 of DE, wherein by with lesser distance
The coolant jacket space of the air locking lateral seal by elasticity is realized around the vestlet of motor body setting.Described cold
But it covers in space, realizes in spiral cooling duct by multiple diversion members and guided by defined fluid, it is described to lead
Fluid element extends between cooling collar and vestlet.Diversion member can be formed as structure on the inner wall of vestlet or in cooling
The component part for being formed as the component on the outer wall of casing or the individual structure shape by being not fixed connection with the two Guan Jun
At.
In addition, a kind of electricity of the hybrid drive for transport facility as known to 10 2,012 008 209 A1 of DE
Machine is provided with coolant jacket annular and for coolant circulation, to realize effective cooling.Here, coolant can
To be axially directed into coolant jacket and be exported from coolant jacket.Water conservancy diversion is achieved, so that imported coolant is at two
It is flowed through in tributary with counter current direction and turns to section and be diverted in this way, so that coolant is returned to coolant outlet
Stream.
In addition, 196 24 519 A1 of DE describes a kind of cooling device for motor comprising have enclosure interior
The shell of part and hull outside part.Enclosure interior part includes the system for the cooling duct that meander shape extends, and the cooling duct is covered
Most of outer surface of lid housing inner part.It is logical that 198 54 464 C2 of DE also illustrates a kind of cooling with meander shape trend
Road.
In order to simplify the manufacture of the shell with coolant jacket, trial is using the component with simple geometric shape or at least
The section of component.Known is, for example, the cylindricality coolant jacket of the cooling duct with axial orientation.Therefore by patent document US 6,
It is a kind of for cooling down the coolant jacket of the stator of motor known to 300,693 B1, have there are two coaxial shell, between shell
Cooling fin and end cap.The central longitudinal axis that cooling fin is parallel to cylindrical shell extends.End cap designs in this way, so that fluid
Meander shape and/or snakelike flow through each individual cooling fin cooling duct separated from one another.Patent document US 7,
800,259 B2 show similar equipment.2006/106086 A1 of patent document WO is shown with cylindrical coolant jacket
Motor, the coolant jacket are flowed through along axial meander shape.6,727,611 1 953 897 A2 of B2, EP of patent document US
Such other equipment are shown with 7,675,209 B2 of US.
Summary of the invention
In this context, technical problem to be solved by the present invention lies in provide a kind of coolant jacket, pass through the coolant jacket
Cooling effect is significantly improved in the case where the volume flow of coolant height is constant or even reduces.It is to be solved by this invention
Technical problem also resides in, and provides a kind of equipped with this coolant jacket, particularly efficient prime mover or working machine.
The technical problem by the present invention by it is a kind of for prime mover or working machine for the cold of coolant circulation
But set solve, the coolant jacket have for coolant entrance and exit and have inner casing and shell, the inner casing and outside
Shell surrounds the annular gap of the coolant flow circulation for coolant between each other, and the coolant jacket also has at least one cloth
The diversion member in annular gap is set, the diversion member is on the circumferential section of inner casing and/or shell in annular gap
Extend and annular gap is divided at least two annular chambers.According to the present invention, diversion member is cold at least one perforation
But agent enters at least another, along the axially-spaced annular relative to annular gap from first annular chamber by the perforation
Overflow openings are consequently formed in chamber and perforation and the entrance and exit for coolant is associated with different annular chambers.Thus real
It is streamed along entire circumferential direction by coolant with having showed inner casing blockiness, thus significantly improves the length of flow path and therefore
Also significantly increase stay time of the coolant in annular gap.It is achieved that from coolant jacket to the heat transmitting of coolant
Efficiency significantly improves, thereby while the gap size in practice between inner casing and shell is usually very small, but still can be with
It is reliably achieved required cooling effect.According to the present invention so that according to the prior art be commonly used in improve volume flow,
The measure for adversely increasing coolant size becomes not essential.While in accordance with it is of the invention, different axially spaced
Perceptible advantageous effects have just been generated when being only provided with unique diversion member to the effect of streaming of inner casing in annular chamber,
But in practice it has proved that with it is multiple or even a large amount of, be advantageous more than the forms of implementation of five diversion members.
The diversion member is preferably arranged in basic configuration in the cross sectional planes of the coolant jacket of rotational symmetry and correspondingly
It is arranged in parallel with each other with distance constant each other or with different, such as increase or reduced distance.
In addition, diversion member can be designed as such structural unit, which has at least one being capable of planar
The separation shell and at least one baffle connected with separation shell phase that ground is arranged on inner casing or shell.Make water conservancy diversion due to separating shell
Body is sealed to relative at least one of two shells so that coolant be not for example as in the prior art with prime mover or
The shell of person's working machine directly contact but relative to shell by separate shell separate, so may not only save relative to
The sealing of at least one shell, and significant the installation for simplifying diversion member.Especially even if in biggish tolerance value
Reliable function can be effectively kept and thus significant simplify installation, wherein the currently designed diversion member for shell
Manipulation is also obvious simpler than being laid with each plate for being separately formed cooling duct.Further, since coolant with by separate shell
Perhaps shell does not contact the risk for reliably avoiding the shell corrosion of prime mover or working machine to the inner casing of protection, therefore
The corresponding anticorrosive measure on shell can especially be removed.Decapsidate even can be saved in the present invention when necessary, so as to
Simplify the design structure of prime mover or working machine.
Diversion member at least can have gradient to blockiness in the circumferential, and the flowing thus reduced in punched areas turns
To especially realizing largely continuous diversion member shape in punched areas.It is possible thereby to realize coolant extremely
The flowing of few major part stratiform.And also particularly advantageously, diversion member is designed as in cross sectional planes from inner casing radially
Outwardly extending rib, wherein the bottom that the height of rib can face inner casing from it is designed with reducing to the outer seamed edge for facing shell,
Or adjacent diversion member single-piece and continuous surface trend in be connected.
The same particularly suitable variant schemes of of the invention another realizes also by following manner, i.e. at least one water conservancy diversion
Element is arranged in the flute profile recess of inner casing or shell.As a result, if only needing to open up annular on inner casing and/or shell
Slot can then be further simplified the manufacture of coolant jacket.Diversion member can be fitted into annular groove and thus frictional fit and
Shape-ordinatedly fix.Diversion member can be designed as example annular molding thus and have enough flexible or bullets
Property, it is adapted to realizing with arcuate shape.
Flute profile recess herein can upwardly extending in entire week in inner casing and/or shell, i.e., also there is perforation, so as to thus
By the position for perforating while determining the perforation of diversion member.Thus, it is possible to realize of the invention be particularly easy in a simple manner
Successful form of implementation, wherein diversion member torsionally, is especially removably attached in preset Angle Position.In order to be pacified
Dress, such as diversion member is fitted into the flute profile recess of shell, then inner casing is drawn in the case where diversion member flexible deformation
Enter in shell.In preset nominal position, it is recessed that diversion member forms side in opposed recess, wherein passes through the stream of contact
Dynamic pressure is advantageously implemented desired sealing.
Another of the invention is equally particularly easy to successfully extend to design also to be accomplished by the following way according to the present invention,
I.e. multiple diversion members are arranged so in flute profile recess, so that recess is with the central longitudinal axis relative to inner casing and/or shell
Different Angle Position arrangements.Thus ensure coolant after entering corresponding annular chamber first along the circumferential section of annular chamber
It flows over and next annular chamber is indirectly for example especially entered by the opposed perforation of another diversion member.
The diversion member is preferably designed for the ring of segmented and thus, it is possible to similar to ripple relieving ring temporary bullets
Widens or compress to be installed and be fitted into the flute profile recess of inner casing or shell to property.
Suitably the diversion member made of plastics or metal, the diversion member can be according to required for this purpose
Heat resistance be based on corresponding use condition selected and be adapted to.
Herein it has proved that being especially reasonably, at least each individual diversion member is mutually positioning in opposite Angle Position
In, at least substantially consistent angle, especially 180 ° ground arrangements so that the perforation of multiple diversion members offsets each other respectively, because
The maximum length of this flow path.Since the perforation of adjacent diversion member is respectively at circumferential opposite side, it is ensured that
Coolant is respectively in two lateral edge hemicycle Zhou Liudong, and the coolant overflows in next annular chamber later.Herein already
It proves, is automatically divided into two in the case where no other additional devices substantially by the coolant perforated into annular chamber
The tributary of upper same size.
It is envisioned that coolant is imported in annular gap in this way by entrance, so that thus having determined simultaneously
The circumferential direction of circulation in annular gap.It and is especially reasonably that the coolant is inputted by entrance and by shunting
Device is divided into two tributaries, and the tributary is mutually converged in the region of perforation.Thus ensure that cooling effect is based in cooling
Constantly raised temperature is consistent on two half cycles for entering opening two sides during coolant jacket is flowed through in agent.
Second technical problem is to provide a kind of electronic prime mover or working machine, equipped with according to the present invention
Coolant jacket, the coolant jacket has inner casing and shell, and the inner casing and shell are surrounded between each other for coolant circulation
Annular gap and there is at least one to be arranged in the diversion member in annular gap, the diversion member in inner casing and/or
Extend in annular gap on the circumferential section of shell and annular gap is divided at least two annular chambers, described second
Thus technical problem solves, i.e., at least one diversion member is perforated by described from first at least one perforation, coolant
Annular chamber enters at least another annular chamber, and the entrance and exit for coolant is associated with different annular chambers.Thus
It is accomplished that first, coolant to same extent flows into annular along two circumferential surfaces in two tributaries after entrance on it
In gap, described two tributaries are mutually converged opposite side was last.There is the perforation of diversion member at this, coolant passes through institute
It states to perforate to enter and be connect in annular chamber later along axial direction.Coolant flows in two tributaries again as a result, connects later
Perforation, the perforation is for instance in the circumferential line identical with entrance for being parallel to central axes.Arbitrarily, it is solely dependent upon prime mover
Or the special case of working machine diversion member sequence and the annular chamber that is consequently formed in the corresponding way with alternately
The perforation variation being arranged on opposite side.Here, the shape and distance of diversion member and such as its diameter can be based on annulars
Such as taper in gap moves towards variation.
Detailed description of the invention
The present invention can have a large amount of form of implementation.In order to further illustrate its basic principle, show in the accompanying drawings
One form of implementation and described herein below.In the accompanying drawings:
Fig. 1 shows the perspective view of the inner casing of working machine；
Fig. 2 shows the perspective views of the shell of working machine；
Fig. 3 shows the vertical section that cutting inner casing and shell obtain；
Fig. 4 shows the vertical section that cutting has been placed in the inner casing of guide element and shell obtains.
Specific embodiment
Coolant jacket 1 according to the invention is elaborated below according to Fig. 1 to 4.The coolant jacket is used for through input cooling
Agent cools down electronic working machine not shown further, and the coolant flows through the coolant jacket 1 of working machine thus.Coolant jacket
1 is made of inner casing 2 and shell 3, and the inner casing and shell surround the annular gap 4 for coolant circulation between each other.In
It is disposed with the diversion member 5 of multiple parallel arrangements in the annular gap 4, the diversion member is in the periphery of inner casing 2 or outer
Extend in annular gap 4 in the inner circumferential of shell 3 and annular gap 4 is divided into multiple annular chamber 6a, 6b.Each diversion member
5 have perforation 7, and coolant enters at least another, along relative to annular gap 4 from first annular chamber 6a by the perforation
Axially-spaced annular chamber 6b, therefore 7 formation of perforating are used for the overflow openings of coolant.Coolant is first from there through entrance 8
Perforation 7 is first reached in annular chamber 6a along the circumferential of inner casing 2 in two tributaries of coolant KS, then in subsequent annular chamber
The outlet 9 of coolant is flowed in 6b in opposite direction.Diversion member 5 separately designs to divide made of plastics or metal thus
It the ring of segmentation and is fitted into the corresponding flute profile recess 10 in inner casing 2 and shell 3.Flute profile recess 10 is to interrupt in itself, because
This is previously determined the Angle Position of diversion member 5 and perforation 7 in design structure.The perforation 7 of adjacent diversion member 5 preferably divides
It does not offset 180 ° each other, this is more particularly to as seen from Figure 2.As supplement, a kind of variant schemes, In are also shown in Fig. 4
In the variant schemes, guide element 11 is packed into corresponding annular chamber, the guide element 11 is conducive to guide coolant
Flowing.
List of numerals
1 coolant jacket
2 inner casings
3 shells
4 annular gap
5 diversion members
6,6a, 6b annular chamber
7 perforation
8 entrances
9 outlets
10 recesses
11 guide elements
KS coolant flow
Claims (10)
1. a kind of have for prime mover or the coolant jacket (1) for coolant circulation of working machine, the coolant jacket (1)
For the entrance (8) of coolant and outlet (9) and there is inner casing (2) and shell (3), the inner casing and shell are between each other
The annular gap (4) of coolant flow (KS) circulation for coolant is surrounded, the coolant jacket (1) also has at least one arrangement
Diversion member (5) in annular gap (4), the diversion member (5) is on the circumferential section of inner casing (2) and/or shell (3)
Extend in annular gap (4) and the annular gap (4) are divided at least two annular chambers (6,6a, 6b), feature
It is, at least one diversion member (5) has at least one perforation (7), and the coolant is perforated by described from first annular
Chamber (6a) enters at least another annular chamber (6b), and is associated with different rings for the entrance (8) of coolant and outlet (9)
Shape chamber (6a, 6b).
2. coolant jacket (1) according to claim 1, which is characterized in that the diversion member (5) is designed as from inner casing radially
Outwardly extending rib.
3. coolant jacket (1) as described in claim 1 or 2, which is characterized in that at least one diversion member (5) is especially detachable
Ground is arranged in the flute profile recess (10) of inner casing (2) and/or shell (3).
4. by coolant jacket (1) described at least one of preceding claims, which is characterized in that the diversion member (5) is antitorque
Ground is especially removably attached in preset Angle Position.
5. by coolant jacket (1) described at least one of preceding claims, which is characterized in that multiple diversion members (5) are in this way
It is arranged in flute profile recess (10), so that perforation (7) is different with the central longitudinal axis relative to inner casing (2) and/or shell (3)
Angle Position arrangement.
6. by coolant jacket (1) described at least one of preceding claims, which is characterized in that diversion member (5) design
For segmented/interrupt ring.
7. by coolant jacket (1) described at least one of preceding claims, which is characterized in that the diversion member (5) is by moulding
Material and/or metal are constituted.
8. by coolant jacket (1) described at least one of preceding claims, which is characterized in that at least each individual water conservancy diversion member
Part (5) is mutually positioning in opposite Angle Position, at least base so that the perforation (7) of multiple diversion members (5) offsets each other respectively
° ground arrangement of consistent angle, especially 180 in sheet.
9. by coolant jacket (1) described at least one of preceding claims, which is characterized in that the coolant passes through entrance
(8) it inputs and is divided into two tributaries by current divider, described two tributaries are mutually converged in the region of perforation (7).
10. a kind of electronic prime mover or working machine, equipped with by coolant jacket described at least one of preceding claims
(1), the coolant jacket has inner casing (2) and shell (3), and the inner casing and shell are surrounded between each other for coolant circulation
Annular gap (4), the diversion member (5) that also there is the coolant jacket at least one to be arranged in annular gap (4) is described to lead
Fluid element (5) extends in the annular gap (4) on the circumferential section of inner casing (2) and/or shell (3) and by annular gap
(4) at least two annular chambers (6,6a, 6b) are divided into, which is characterized in that at least one diversion member (5) is worn at least one
Hole (7), the coolant enters at least another annular chamber (6b) from first annular chamber (6a) by the perforation, and is used for
The entrance (8) of coolant and outlet (9) are associated with different annular chambers (6a, 6b).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018207842.4 | 2018-05-18 | ||
| DE102018207842.4A DE102018207842A1 (en) | 2018-05-18 | 2018-05-18 | A cooling jacket through which a coolant can flow and an electric power or working machine equipped with such a cooling jacket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110504793A true CN110504793A (en) | 2019-11-26 |
Family
ID=68419755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910410596.5A Pending CN110504793A (en) | 2018-05-18 | 2019-05-17 | For the coolant jacket of coolant circulation and electronic prime mover or working machine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110504793A (en) |
| DE (1) | DE102018207842A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019220059A1 (en) * | 2019-12-18 | 2021-06-24 | Volkswagen Aktiengesellschaft | Housing of a fluid-cooled car electric motor |
| EP4012896A1 (en) * | 2020-12-10 | 2022-06-15 | Etel S.A. | Stator cooling housing for a stator of a rotary electric motor |
| EP4283843A4 (en) * | 2021-02-26 | 2024-04-03 | Huawei Digital Power Tech Co Ltd | Powertrain and electric vehicle |
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|---|---|
| DE102018207842A1 (en) | 2019-11-21 |
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Application publication date: 20191126 |