CN113056624A - Structural element for a vehicle - Google Patents

Structural element for a vehicle Download PDF

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Publication number
CN113056624A
CN113056624A CN201980077932.7A CN201980077932A CN113056624A CN 113056624 A CN113056624 A CN 113056624A CN 201980077932 A CN201980077932 A CN 201980077932A CN 113056624 A CN113056624 A CN 113056624A
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CN
China
Prior art keywords
structural element
composite
layer
vehicle
shaped
Prior art date
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Granted
Application number
CN201980077932.7A
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Chinese (zh)
Other versions
CN113056624B (en
Inventor
R·托马斯
F·菲舍尔
T·格罗泽
T·默滕斯
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Volkswagen Automotive Co ltd
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Volkswagen Automotive Co ltd
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Publication of CN113056624A publication Critical patent/CN113056624A/en
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Publication of CN113056624B publication Critical patent/CN113056624B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/10—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/08—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/001—Superstructures, understructures, or sub-units thereof, characterised by the material thereof characterised by combining metal and synthetic material
    • B62D29/005—Superstructures, understructures, or sub-units thereof, characterised by the material thereof characterised by combining metal and synthetic material preformed metal and synthetic material elements being joined together, e.g. by adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B32B2260/023—Two or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/748—Releasability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a structural element (10) for a vehicle (12). It is provided that the structural element (10) has a cigar shape, in which a composite (26) comprising a layer (14) made of natural material and a further layer (16) made of metal material as a covering layer is rolled up, for example, about a longitudinal axis (L), so that a helical cross section (36) results.

Description

Structural element for a vehicle
Technical Field
The invention relates to a method for producing a structural element for a vehicle according to the preamble of claim 1, to a structural element for a vehicle according to the preamble of claim 6 and to a vehicle according to the preamble of claim 10.
Background
Structural elements in the vehicle sector, for example in motor vehicles, are subjected to various loads. This applies in particular in the case of accidents. In particular, the invention relates to a support element in the form of a door sill, a door crash tube (crahrohr), a B-pillar or a longitudinal support element. Such structural elements are therefore conventionally designed to be very robust (massiv), usually consisting of metal.
In addition to requirements such as high economy and low weight, there are important technical requirements for such structural elements, in particular high energy absorption in the event of an accident and the possibility of also absorbing energy from different load directions.
For conventional bearings made of metal, this results in that they have to be designed individually for the different requirements and do not sufficiently satisfy the requirements mentioned above.
DE 102012015919 a1 discloses, for example, a battery housing, the housing base of which is produced in the manner of a sandwich structure (Sandwichbauweise) made of a plurality of fiber-reinforced plastic layers.
Furthermore, DE 102014207483 a1 discloses a structural component for a motor vehicle having a sandwich structure with a core and two cover layers (deckchicht).
Document DE 102016222435 a1 also discloses a sandwich element, which is applied to a load-bearing structure.
Disclosure of Invention
The present invention now aims to provide a novel structural element which can be flexibly adapted to different load requirements, has a low weight and at the same time can be produced simply.
This object is achieved by the objects of the independent claims 1,6 and 10. Further preferred embodiments of the invention result from the remaining features mentioned in the dependent claims and the description.
A first aspect of the invention relates to a method for manufacturing a structural element for a vehicle, comprising the steps of: layers composed of natural materials are introduced between further layers and the layers are joined to form a composite.
According to the invention, the composite is shaped such that the shaped composite has a helical cross section at least in sections.
The joining of the layers can be effected, for example, by pressing or also by gluing and, if appropriate, hardening. It is also thereby obtained that the layer consisting of natural material and the further layer do not necessarily have to be directly adjacent to one another. As such, there may be, for example, a layer (e.g., an adhesive layer) that is not yet consolidated between the additional layer and the layer comprised of the natural material. In principle, further layers of different natural materials, plastics, fiber composite plastics and metal materials, for example, can be provided. In other words, at least two further layers should be provided which cover at least one layer made of natural material here from both sides.
Preferably a layer provided as endless material (endless) is used. Which is suitably separated after joining, so that the composite is prepared longer (konfekinionieren).
The shaping of the joined composite is preferably carried out by bending, preferably also with a roll forming device (rollformer).
In other words, the produced construction element can have, for example, a cigar shape (Zigarrenform), in which a composite comprising a layer made of natural material and a further layer as a cover layer is rolled up, for example, about a longitudinal axis, so that a helical cross section results.
Wood is preferably used as the natural material. Wood is an inexpensive, renewable and light material. The helical cross section can be produced from wood with particularly little effort, wherein the wood can also absorb particularly high forces in this shape. But other natural materials with corresponding properties may also be used.
The spiral of the helical cross section does not necessarily have to be round, but can also be triangular, quadrangular or polygonal and can thus be adapted, for example, to the surrounding geometry (where the spiral should be fixed, for example).
The method according to the invention can be carried out very simply and is also suitable for mass production (massenproduction). The manufacturable structural element can here be designed and manufactured simply for the respective different requirements. The method according to the invention is particularly suitable for producing tubular structural elements. In principle, the structural element produced is small in terms of its mass and at the same time very highly loadable. The combination of the specific properties of the natural material with respect to pressure and bending loads and the specific properties of the further layers laminated thereon enables a flexible shaping and at the same time a high load capacity, since energy from different load directions can be absorbed effectively due to the sandwich construction. The person skilled in the art suitably selects the materials for the further layers taking into account the requirements on the structural elements (e.g. load-bearing capacity, toughness, plasticity, quality, weatherability, material compatibility with the surrounding structure, electrical properties and according to the remaining technical teachings disclosed herein.
In a preferred embodiment of the method according to the invention, it is provided that the further layer comprises a metallic material.
The metal material is advantageously characterized, for example, in that it can also be shaped particularly well with a high load capacity and is then dimensionally stable, which is advantageous precisely when producing a helical cross section according to the invention.
In a preferred embodiment of the method according to the invention, it is provided that the layer made of natural material is arranged directly adjacent to another layer, preferably made of metallic material.
In other words, a further layer is laminated directly to the layer consisting of natural material, wherein, if appropriate, an adhesive layer can also be arranged between them.
The construction of the fabricated components and the implementation of the method according to the invention can therefore be carried out particularly inexpensively.
In a further preferred embodiment of the method according to the invention, provision is made for the shaped composite to be joined to a structural element forming the outer surface of the structural element.
The structural element can be introduced particularly advantageously into a tubular structural part. But it may also be arranged, for example, between one or more plates that are preferably connected to each other. In other words, the shaped composite forms the core of the structural element, which may be surrounded by further structural elements. The structural element produced by the method according to the invention can therefore be distinguished from conventional structural elements in terms of appearance.
In a further preferred embodiment of the method according to the invention, it is provided that the shaped composite is subjected to a further shaping step, in which the helical cross section is at least partially deformed.
In other words and by way of illustration, the above-mentioned cigar shape is explained, which can be flattened, for example, section by section transversely to its longitudinal axis. This variant is preferably used to produce mechanical interfaces (Schnittstelle), for example assembly interfaces, and is designed accordingly for this purpose. The flattening (platttdruecken) can be carried out, for example, only in the end region of the cigar, for example, in order to produce a screwing point to other structural parts or other parts of the vehicle. Such interfaces are also designed in particular to absorb the energy to be absorbed again in the event of an accident. Cigars can be completely or only partially flattened in view of the degree of compression (Kompressionsgrad).
As already mentioned above, the cigar can be flattened along its longitudinal axis, purely by way of example only in sections, for example in an end region, in end regions, in an intermediate region or in other regions which would be advantageous for a person skilled in the art in the production of such interfaces. The flattening can also vary in compressibility along the longitudinal axis, so that the cylindrical cigar shape can also transition into a tapering cigar shape or even a cone shape, for example. If, as already mentioned, the shaped composite is arranged, for example, between further structural parts, it can also be co-shaped in a further shaping step.
In the event of an accident, the force absorption and energy dissipation can therefore be set independently of the direction of action and can therefore be optimized particularly advantageously.
In a further preferred embodiment of the method according to the invention, it is provided that the further layer comprises a steel plate and the layer made of natural material comprises a wood veneer sheet (Holzfurnier).
The steel sheet is preferably made thinner, wherein the person skilled in the art can autonomously determine the lower limit of the sheet thickness while making full use of the load-bearing capacity of the layer consisting of natural material. The wood veneer sheet can be used particularly advantageously and is simple to produce. The adhesive is preferably applied between the layers and subsequently pressed and hardened or also partially hardened (for re-hardening in a later processing step (Nachhaerten)). The shaping of the composite is then preferably carried out.
A second aspect of the invention relates to a structural element for a vehicle, comprising: a layer of natural material disposed between the further layers and joined to them in a composite.
According to the invention, the composite is shaped such that the shaped composite has a helical cross section at least in sections.
The structural element according to the invention can in particular be a structural element which can be produced according to the preceding description in a method according to the invention. The above description therefore also applies correspondingly to the structural element according to the invention.
In a preferred embodiment of the structural element according to the invention, it is provided that the further layer comprises a metallic material.
In a further preferred embodiment of the structural element according to the invention, it is provided that the shaped composite is bonded to a structural part forming the outer surface of the structural element.
In a further preferred embodiment of the structural element according to the invention, it is provided that the helical cross section of the shaped composite is deformed at least in sections.
In a further preferred embodiment of the structural element according to the invention, it is provided that the structural element comprises a sill, a pillar or another load-bearing structure for a vehicle.
A third aspect of the invention relates to a vehicle comprising a structural element according to the invention according to the preceding description or comprising a structural element manufactured according to the preceding description in a method according to the invention.
The vehicle may preferably be a motor vehicle.
The different embodiments of the invention mentioned in this application can be combined with one another advantageously, as long as they are not implemented separately.
Drawings
The invention is explained below by way of example according to the accompanying drawings. Wherein:
figure 1 shows a flow of a method according to the invention,
figure 2 shows a structural element according to the invention in cross-section,
fig. 3 shows a further structural element according to the invention; and
fig. 4 shows a vehicle according to the invention.
Detailed Description
Fig. 1 shows a process flow of a method according to the invention for producing a structural element 10 for a vehicle 12 (see fig. 4).
The method shown in fig. 1 begins with the introduction of a layer 14 made of natural material between two further layers 16 (which in this embodiment are made of metallic material) in this embodiment. The layer 14 of natural material is now a plank 18. The other layer 16 is now a thinner steel plate 20. The plank sheet 18 and the steel sheet 20 are stored as endless material (this is not shown here) and provided in a continuous process. In fig. 1, this is carried out in the Y direction according to the coordinate system shown.
In order to introduce the veneer pieces 18 between the steel plates 20, a rolling device 22 is provided. The plank pieces 18 are coated with adhesive 24 on both sides before being introduced into the steel sheets 20. The adhesive 24 has not hardened in this step of the method.
The joining of the steel sheet 20 to the wood sheet 18 into the composite 26 is performed after passing through the rolling apparatus 22. For this purpose, the steel plate 20 and the wood veneer 18 are passed through a pressing tool 28, which is optionally tempered. The pressing of the layers 14,16 to the composite 26 and the hardening of the adhesive 24 takes place in a pressing tool 28.
After the composite 26 exits the press tool 28 in the Y direction, separation of the composite 26 is performed using a separation tool 30. This separation is expediently carried out only after the shaping step of the composite 26 described below. It should also be noted with regard to the separation that the process can also be designed approximately continuously for this purpose.
The mentioned forming step is currently carried out by means of a roll-forming device 32. The compound 26 enters the roll-forming apparatus 32 in the Y direction and is then rolled about its longitudinal axis L in a current counterclockwise direction. The longitudinal axis L is currently oriented parallel to the axis X of the coordinate system shown.
In this molding step, a molded composite 34 is produced having a helical cross-section 36.
Fig. 2 shows a structural element 10 according to the invention in a cross-sectional view.
In the lower part of fig. 2, the structural element 10 according to the invention is shown first after the end of its production method according to the invention. The coordinate system contained in fig. 2 corresponds to that in fig. 1.
In the upper part of fig. 2, a further embodiment of the structural element 10 is shown, in which the shaped composite 34 is joined to a further structural component 38. As shown in the upper part of fig. 2, the molded composite 34 is inserted in a sandwich-like manner between the structural parts 38. The structural element 38 here forms an outer surface 40 of the structural element 10.
In the end region 42 (shown exemplary in the right end region 42), the molded composite 34 (in the present case, for example, together with the further structural element 38) can be subjected to a further molding step. The helical cross section 36 is flattened in the end region 42 and forms part of the connection 44 for the assembly of the structural element 10 to the surrounding system and for force dissipation.
This further shaping step is currently carried out transversely to the longitudinal axis L and along the entire longitudinal axis L.
The structural elements 38 are preferably connectable to each other in the end regions 42.
Fig. 3 shows a further structural element 10 according to the invention. The construction element 10 is shown in an isometric view at the upper left and in a sectional view a-a at the lower right (Schnittverlauf).
The structural element 10 is a rocker 46, purely exemplary for the vehicle 12 shown in fig. 4. The internal configuration of the rocker 46 is shown in detail in the cross-sectional view. It is recognized that the threshold 46 includes an additional structural member 38 composed of metal. Which forms the outer surface 40 of the threshold 46.
The molded composite 34 is disposed internally or opposite the outer surface 40. The layer 14 made of natural material and the further layer 16 made of metal material are shown here only in a simplified manner. It can be recognized that the shaped composite 34 deforms transversely to its longitudinal axis L and follows the shape of the further structural element 38. The composite 34 molded in the end region 42 is completely flattened and forms a mechanical interface 44 with the structural member 38 to the vehicle 12. If a force F, for example caused by an accident, now acts from the outside, the introduced energy is converted to deformation work (Deformationsarbeit) by a large part of the shaped compound 34 and the rest is conducted out into the vehicle 12 via the interface 44.
Fig. 4 finally shows a vehicle 12 according to the invention, which is an exemplary motor vehicle 48.
As already mentioned, the structural element 10 according to the invention is used as a door sill 46 in a motor vehicle 48. But may also be used for other load bearing structures, such as also for the B-pillar 50.
List of reference numerals
10 structural element
12 vehicle
14 layer of natural material
16 additional layers
18 plank
20 steel plate
22 rolling mill
24 adhesive
26 composite
28 extrusion tool
30 separation tool
32 roll forming equipment
34 shaped composite
36 helical cross section
38 structural member
40 outer surface
42 end region
44 interface
46 threshold
48 motor vehicle
50B column
L longitudinal axis
F, force.

Claims (10)

1. A method for manufacturing a structural element (10) for a vehicle (12), comprising the steps of: introducing layers (14) made of natural material between further layers (16) and joining the layers (14;16) to form a composite (26), characterized in that the composite (26) is shaped in such a way that the shaped composite (34) has a helical cross section (36) at least in sections.
2. A method according to claim 1, characterized in that the further layer (16) comprises a metallic material.
3. The method according to any one of the preceding claims, characterized in that the shaped composite (34) is bonded to a structural part (38) forming an outer surface (40) of the structural element (10).
4. Method according to any one of the preceding claims, characterized in that the shaped composite (34) is subjected to a further shaping step, in which the helical cross-section (36) is deformed at least in sections.
5. Method according to any of the preceding claims, characterized in that the further layer (16) comprises a steel plate (20) and the layer (14) of natural material comprises a wood veneer sheet (18).
6. A structural element (10) for a vehicle (12), comprising: layer (14) made of natural material, which is arranged between further layers (16) and with which a composite (26) is formed, characterized in that the composite (26) is shaped in such a way that the shaped composite (34) has a helical cross section (36) at least in sections.
7. The structural element (10) according to claim 6, characterised in that the further layer (16) comprises a metallic material.
8. The structural element (10) according to claim 6 or 7, characterised in that the shaped compound (34) is bonded to a structural part (38) forming an outer surface (40) of the structural element (10).
9. The structural element (10) according to claims 6 to 8, characterised in that the helical cross section (36) of the shaped composite (34) is deformed at least in sections.
10. A vehicle (12) comprising a structural element (10) according to any one of claims 6 to 9 or manufactured with a method according to any one of claims 1 to 5.
CN201980077932.7A 2018-11-26 2019-11-25 Structural element for a vehicle Active CN113056624B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102018220214.1 2018-11-26
DE102018220214.1A DE102018220214A1 (en) 2018-11-26 2018-11-26 Structural element for a vehicle
PCT/EP2019/082339 WO2020109193A1 (en) 2018-11-26 2019-11-25 Structural element for a vehicle

Publications (2)

Publication Number Publication Date
CN113056624A true CN113056624A (en) 2021-06-29
CN113056624B CN113056624B (en) 2023-07-18

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CN (1) CN113056624B (en)
DE (1) DE102018220214A1 (en)
WO (1) WO2020109193A1 (en)

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