Vehicle side wall structure and vehicle

Abstract

The utility model provides a vehicle side wall structure and a vehicle. The vehicle side wall structure comprises a supporting component and a polyurea coating arranged on at least part of the surface of the supporting component. The polyurea coating is applied to a vehicle side wall structure, and after a vehicle is subjected to side impact, the polyurea coating can absorb and dissipate part of energy through hydrogen bond breakage in an internal molecular chain of the polyurea coating; meanwhile, the polyurea coating has good strength and elongation at break, so that when the vehicle side wall structure is subjected to high-speed impact, the polyurea coating can reduce the deformation of the supporting component through the stress resistance of the polyurea coating. And moreover, the risk of tearing at a weak stress part (such as a welding site) of the vehicle side wall structure can be reduced through the polyurea coating arranged on the vehicle side wall structure, and the safety of the vehicle when the vehicle encounters side impact is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a vehicle side structure and a vehicle. BACKGROUND

[0002] The vehicle side structure plays a supporting role and a collision protection role at the same time. With the increasing requirement for vehicle safety, high-strength materials are usually used to improve the safety of the structure. However, the above vehicle side structure still has safety risks during side impact, and the safety of the vehicle side structure needs to be further improved. CONTENT OF THE UTILITY MODEL

[0003] The present application is made in view of the above problem, and aims to provide a vehicle side structure with higher safety.

[0004] The first aspect of the present application provides a vehicle side structure, comprising a support member and a polyurea coating layer arranged on at least part of the surface of the support member.

[0005] The polyurea coating layer is applied to the vehicle side structure in the embodiments of the present application. After the vehicle is subjected to side impact, the polyurea coating layer can absorb and dissipate part of the energy by breaking the hydrogen bonds in the molecular chains therein. At the same time, the polyurea coating layer itself has good strength and elongation at break, so that when the vehicle side structure is subjected to high-speed impact, the polyurea coating layer can reduce the deformation amount of the support member by its own stress resistance. Moreover, the polyurea coating layer arranged on the vehicle side structure can reduce the risk of tearing at the weak force position (such as the welding site) of the vehicle side structure, and improve the safety of the vehicle when subjected to side impact. Moreover, the polyurea coating layer has the properties of light weight and high strength, which can improve the safety of the vehicle while meeting the requirement of lightweight of the vehicle, which is more important for new energy vehicles with "mileage anxiety".

[0006] In any embodiment, the support member comprises a B-pillar.

[0007] The polyurea coating layer arranged on at least part of the surface of the B-pillar can resist side impact, reduce the risk of tearing at the welding site of the B-pillar, and improve the safety of the vehicle.

[0008] In any embodiment, in the circumferential direction, the polyurea coating layer is continuously coated on the circumferential surface of the B-pillar.

[0009] The continuous coating of the polyurea coating layer in the circumferential direction enables the polyurea coating layer to form a continuous and integrated wrap-around coating on the inner and outer surfaces of the B-pillar, further reducing the risk of tearing at the welding site and improving the safety of the vehicle.

[0010] In any embodiment, in the vertical direction, the polyurea coating layer is coated on at least part of the surface of the B-pillar.

[0011] Coating the polyurea coating only in the area where the impact force has a serious influence can play a role in reducing costs and increasing efficiency.

[0012] In any embodiment, the support member includes a roof beam, a rocker beam, and a B-pillar connecting the roof beam and the rocker beam, the polyurea coating includes a first part arranged at a lower part of the B-pillar and a second part arranged at an upper part of the rocker beam, and the first part and the second part are continuous.

[0013] Simulation analysis and crash tests show that the connection between the B-pillar 3 and the rocker beam 2 is also a stress concentration point prone to failure in high-speed crash tests. By arranging the polyurea coating continuously on the B-pillar of the vehicle side structure and the rocker beam connected thereto, the crash energy can be effectively dispersed by integrated forming.

[0014] In any embodiment, the polyurea coating has an elongation at break of 50% to 500%.

[0015] In any embodiment, the polyurea coating has a tensile strength of 20 MPa to 70 MPa.

[0016] In any embodiment, the polyurea coating has a tensile modulus of 50 MPa to 1200 MPa.

[0017] The polyurea coating provided by the embodiments of the present application has good strength and plasticity, and the polyurea coating has high strength and can absorb high crash energy through coating deformation, thereby reducing the failure risk of the support member and improving the safety of the vehicle side structure.

[0018] In any embodiment, the polyurea coating has a thickness of 0.5 mm to 15 mm.

[0019] The polyurea coating with a thickness in the above range can improve the safety of the vehicle while meeting the cost requirements.

[0020] In any embodiment, the polyurea coating has a density of 1.0 g / cm 3 -1.5 g / cm 3 .

[0021] It can be understood that the density of the polyurea coating varies depending on the type of additives and the type of polyurea resin in the coating.

[0022] In any embodiment, the polyurea coating includes a first component containing an isocyanate group and a second component containing an amino-terminated group.

[0023] The second aspect of the present application provides a vehicle including the vehicle side structure of any embodiment.

[0024] The vehicle has better safety.

[0025] In any embodiment, the vehicle is a new energy vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a front view schematic diagram of a vehicle side structure according to an embodiment of the present application.

[0027] Figure 2 is a schematic diagram of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] Hereinafter, embodiments of a vehicle side structure and a vehicle according to the present application are specifically disclosed with appropriate reference to the accompanying drawings. However, there will be cases where unnecessary detailed description is omitted. For example, there will be cases where detailed description of matters known well and repeated description of substantially identical structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided so that those skilled in the art can fully understand the present application, and are not intended to limit the subject matter recited in the claims.

[0029] The "ranges" disclosed in the present application are defined in the form of lower and upper limits, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The ranges defined in this way can include or exclude the end values, and can be arbitrarily combined, i.e., any lower limit can be combined with any upper limit to form a range. For example, if the ranges 60-120 and 80-110 are listed for a particular parameter, it is understood that the ranges 60-110 and 80-120 are also contemplated. Furthermore, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In the present application, unless otherwise specified, a numerical range "a-b" represents a shorthand notation for any real combination of integers between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been listed herein, and "0-5" is just a shorthand notation for these numerical combinations. In addition, when it is stated that a certain parameter is an integer ≥ 2, it is equivalent to disclose that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0030] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0031] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0032] If not specifically stated, all steps of the present application can be performed in any order, preferably in the order as stated. For example, the method comprises steps (a) and (b) means that the method can comprise steps (a) and (b) in the order as stated, or the method can comprise steps (b) and (a) in the order as stated. For example, the method can further comprise step (c) means that step (c) can be added to the method in any order, for example, the method can comprise steps (a), (b) and (c), or the method can comprise steps (a), (c) and (b), or the method can comprise steps (c), (a) and (b), etc.

[0033] If not specifically stated, the terms "comprising" and "including" as used in the present application are open-ended. For example, the terms "comprising" and "including" can mean that other components not listed can also be included, or that only the listed components can be included.

[0034] If not specifically stated, the term "or" in the present application is inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, any of the following satisfy the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0035] With the increasing requirements for vehicle safety, the stiffness and strength of the material of the vehicle side structure support member are generally increasing. However, the high stiffness and high strength material is not tough enough, and is prone to tearing due to excessive deformation during a collision, which poses a great risk to passenger safety.

[0036] [Vehicle side structure]

[0037] Based on this, the present application provides a vehicle side structure, comprising a support member and a polyurea coating layer arranged on at least part of the surface of the support member.

[0038] The main component of the polyurea coating layer is polyurea, which is a substance generated by the reaction of an isocyanate component and an amino compound component. It can be understood that any other material can be included in the polyurea coating layer to meet the functionalization requirements.

[0039] The polyurea coating is applied to the vehicle side structure. After the vehicle is subjected to side impact, the polyurea coating can absorb and dissipate part of the energy by breaking the hydrogen bond in the molecular chain. At the same time, the polyurea coating itself has good strength and elongation at break, so that when the vehicle side structure is subjected to high-speed impact, the polyurea coating can reduce the deformation amount of the supporting member by its own stress resistance. Moreover, the polyurea coating coated on the vehicle side structure can reduce the risk of tearing at the weak stress position (such as the welding site) of the vehicle side structure, and improve the safety of the vehicle when subjected to side impact. Moreover, the polyurea coating has the properties of light weight and high strength, which can improve the safety of the vehicle while meeting the requirement of lightweight of the vehicle, which is more important for new energy vehicles with "mileage anxiety".

[0040] In some embodiments, the supporting member comprises a B-pillar.

[0041] The B-pillar is also the main impact member when the vehicle is subjected to side impact. The polyurea coating arranged on at least part of the surface of the B-pillar can resist side impact, reduce the risk of tearing at the welding site of the B-pillar, and improve the safety of the vehicle.

[0042] In some embodiments, the B-pillar comprises a hot-formed steel, and the tensile strength of the hot-formed steel is greater than or equal to 1400 MPa.

[0043] Although such materials have high strength, they are insufficient in toughness and poor in deformability. It is difficult to absorb collision energy by material deformation during vehicle collision. By arranging a polyurea coating on the surface thereof, the polyurea coating can continuously break under high-strength and high-speed collision impact, and can absorb a large amount of energy by itself during the collision process, thereby reducing the probability of tearing of the steel material and improving the safety of the vehicle.

[0044] In some embodiments, in the circumferential direction, the polyurea coating is continuously coated on the peripheral surface of the B-pillar.

[0045] The continuous coating of the polyurea coating in the circumferential direction enables the polyurea coating to form a continuous and integrated circumferential coating on the inner and outer surfaces of the B-pillar, further reducing the risk of tearing at the welding site and improving the safety of the vehicle.

[0046] In some embodiments, in the vertical direction, the polyurea coating is coated on at least part of the surface of the supporting member.

[0047] Coating the polyurea coating only in the area seriously affected by the collision force can reduce costs and increase efficiency.

[0048] In some embodiments, the polyurea coating is sprayed on at least part of the surface of the supporting member.

[0049] The shape of the support member does not affect the coating of the polyurea coating, and the use of the polyurea coating on the vehicle side structure is also applicable to the molding of complex structures.

[0050] In some embodiments, as shown in Figure 1 The support member includes a roof beam 1, a rocker beam 2, and a B-pillar 3 connecting the roof beam 1 and the rocker beam 2, and the polyurea coating 4 includes a first portion 41 arranged at a lower part of the B-pillar 3 and a second portion 42 arranged at an upper part of the rocker beam 2, and the first portion 41 and the second portion 42 are continuous.

[0051] Simulation analysis and crash test show that the connection between the B-pillar 3 and the rocker beam 2 is also a stress concentration point prone to failure in high-speed crash tests, and the continuous arrangement of the polyurea coating on the B-pillar of the vehicle side structure and the rocker beam connected thereto can effectively disperse the crash energy through integrated molding.

[0052] In some embodiments, in the front view of the vehicle side structure, the distance L1 between the upper edge of the first portion of the coating and the upper edge of the B-pillar is 5 cm - 10 cm.

[0053] In some embodiments, in the front view of the vehicle side structure, the distance L2 between the lower edge of the second portion of the coating and the lower edge of the rocker beam is 7 cm - 12 cm.

[0054] In some embodiments, the width of the second portion of the coating in the horizontal direction close to the B-pillar side is less than the width of the second portion of the coating in the horizontal direction away from the B-pillar side.

[0055] In some embodiments, the width of the second portion of the coating in the horizontal direction is greater than the width of the first portion of the coating in the horizontal direction.

[0056] In some embodiments, the elongation at break of the polyurea coating is 50% - 500%.

[0057] In some embodiments, the elongation at break of the polyurea coating can be tested by any known method in the art. As an example, the elongation at break of the polyurea coating is tested according to GB / T 528-2009 "Determination of Tensile Stress-Strain Properties of Vulcanized or Thermoplastic Rubber".

[0058] In some embodiments, the elongation at break of the polyurea coating can be selected as 50%, 100%, 150%, 200%, 250%, 300%, 350%, 400%, 450%, 500%, or any numerical range between any two of them.

[0059] In some embodiments, the tensile strength of the polyurea coating is 20 MPa-70 MPa.

[0060] In some embodiments, the tensile strength of the polyurea coating can be tested by any known method in the art. As an example, the tensile strength of the polyurea coating is tested according to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized or thermoplastic rubbers".

[0061] In some embodiments, the tensile strength of the polyurea coating can be selected from 20 MPa, 30 MPa, 40 MPa, 50 MPa, 60 MPa, 70 MPa, or any numerical range between any two of them.

[0062] In some embodiments, the tensile modulus of the polyurea coating is 50 MPa-1200 MPa.

[0063] In some embodiments, the tensile modulus of the polyurea coating can be tested by any known method in the art. As an example, the tensile modulus of the polyurea coating is tested according to GB / T 1040.1-2018.

[0064] In some embodiments, the tensile modulus of the polyurea coating can be selected from 50 MPa, 100 MPa, 200 MPa, 300 MPa, 400 MPa, 500 MPa, 600 MPa, 700 MPa, 800 MPa, 900 MPa, 1000 MPa, 1100 MPa, 1200 MPa, or any numerical range between any two of them.

[0065] The polyurea coating provided by the embodiments has good strength and plasticity, can absorb high collision energy through coating deformation, reduce the risk of failure of the support member, and improve the safety of the vehicle side structure.

[0066] In some embodiments, the thickness of the polyurea coating is 0.5 mm-15 mm.

[0067] In some embodiments, the thickness of the polyurea coating can be selected from 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, or any numerical range between any two of them.

[0068] The polyurea coating with the thickness in the above range can improve the safety of the vehicle and meet the cost requirements.

[0069] In some embodiments, the density of the polyurea coating is 1.0 g / cm 3 -1.5 g / cm3 .

[0070] The density of the polyurea coating can be selected from 1.0 g / cm 3 , 1.1 g / cm 3 , 1.2 g / cm 3 , 1.3 g / cm 3 , 1.4 g / cm 3 , 1.5 g / cm 3 , or any range between any two of the above values.

[0071] It can be appreciated that the density of the polyurea coating varies depending on the type of additives in the coating and the type of polyurea resin.

[0072] In some embodiments, the polyurea coating comprises a first component comprising isocyanate groups and a second component comprising terminal amino groups.

[0073] In some embodiments, the first component comprises at least two isocyanate groups. The first component can be a monomer, a polymer, a derivative of isocyanate, a prepolymer, and a semi-prepolymer.

[0074] In some embodiments, the first component comprises one or more of hexamethylene diisocyanate, polymethylene polyphenyl polyisocyanate, diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, xylene diisocyanate, phenylene diisocyanate, dimethoxybenzidine isocyanate, alkylated phenylene diisocyanate, naphthalene diisocyanate, and prepolymers thereof.

[0075] In some embodiments, the second component comprises at least two terminal amino groups. The second component can be a monomer, a polymer, a prepolymer, and a semi-prepolymer.

[0076] In some embodiments, the second component comprises one or more of polytetramethylene ether glycol bis-p-aminobenzoate, dihydric terminal amino polypropylene oxide ether, trihydric terminal amino polypropylene oxide ether, terminal amino polyethylene oxide ether, polyaspartic ester, benzothiazole-modified polyaspartic ester, terminal amino polytetrahydrofuran, difunctional aliphatic polyester primary amine, trifunctional aliphatic polyester primary amine, aromatic diethyl toluene di-primary amine, diethylene triamine, triethylene tetramine, tetraethylene pentamine, polyamidoamine.

[0077] A second aspect of the present application provides a vehicle comprising the vehicle side structure of any of the embodiments.

[0078] In some embodiments, the vehicle is a new energy vehicle.

[0079] Hereinafter, the examples of the present application will be described. The examples described below are illustrative and are given by way of illustration only, and should not be construed as limiting the present application. In the examples, the specific technique or condition not mentioned is performed according to the technique or condition described in the literature in the art or according to the product manual. The reagent or instrument not mentioned the manufacturer is a general product which can be obtained by purchase in the market.

[0080] Example

[0081] Hereinafter, the examples of the present application will be described. The examples described below are illustrative and are given by way of illustration only, and should not be construed as limiting the present application. In the examples, the specific technique or condition not mentioned is performed according to the technique or condition described in the literature in the art or according to the product manual. The reagent or instrument not mentioned the manufacturer is a general product which can be obtained by purchase in the market.

[0082] I. Preparation method

[0083] It should be noted that the present application is not limited to the above-described embodiments. The above-described embodiments are merely examples, and embodiments having substantially the same configuration and exerting the same effects as the technical idea within the scope of the technical solutions of the present application are included in the technical scope of the present application. In addition, within the scope of the gist of the present application, various modifications that can be thought of by those skilled in the art, other modes constructed by combining part of the elements of the embodiments are also included in the scope of the present application.

[0084] Example 1

[0085] Method for preparing vehicle side structure:

[0086] The first component containing isocyanate group, hexamethylene diisocyanate and its prepolymer, as component A, and the second component containing amino-terminated, di-amino-terminated polyoxypropylene ether, as component B, are mixed uniformly in the mixing chamber of the special polyurea spraying equipment under high temperature and high pressure at a volume ratio of 1:1, and then sprayed on the B-pillar and rocker of the vehicle, and the schematic diagram of the front view of the vehicle side structure obtained is shown in Figure 1 The main forming material of the vehicle B-pillar is hot-formed steel with a tensile strength of 1400 MPa. The polyurea coating is wrapped around the inner and outer surfaces of the B-pillar.

[0087] The elongation at break of the polyurea coating is 384%; the tensile strength of the polyurea coating is 24 MPa; the elastic modulus of the polyurea coating is 81 MPa; the thickness of the polyurea coating is 4 mm, and the density of the polyurea coating is 1.02 g / cm 3 .

[0088] Example 2

[0089] The preparation method of Example 2 is basically the same as that of Example 1, except that the first component in the polyurea coating is naphthalene diisocyanate and its prepolymer, and the second component is polyamide amine. The elongation at break of the polyurea coating is 85%; the tensile strength of the polyurea coating is 62 MPa; the elastic modulus of the polyurea coating is 726 MPa; the thickness of the polyurea coating is 4 mm, and the density of the polyurea coating is 1.02 g / cm 3 .

[0090] Example 3

[0091] The preparation method of Example 3 is basically the same as that of Example 1, except that the polyurea coating is only sprayed on the outer surface of the B pillar, without forming a wrap-around coating.

[0092] Comparative Example 1

[0093] The preparation method of Comparative Example 1 is basically the same as that of Example 1, except that the coating component is silicone rubber, which is prepared by addition reaction of vinyl-terminated polydimethylsiloxane and polymethylhydrosiloxane under the action of platinum gold catalysis. The thickness of the silicone rubber coating is 4 mm.

[0094] Comparative Example 2

[0095] The support member surface of Comparative Example 2 has no coating.

[0096] II. Test Methods

[0097] The support member is subjected to side column impact test according to C-NCAP China New Vehicle Evaluation Procedure.

[0098] III. Test Results

[0099]

[0100] The present application can significantly reduce the deformation of the vehicle side structure after experiencing side impact by coating a polyurea coating on the surface of the vehicle side structure, while reducing the risk of cracking of the welds on the B pillar and improving the safety of the vehicle.

[0101] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and embodiments having the same technical idea and playing the same role within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, within the scope of the main idea of the present application, various modifications of the embodiments that can be thought of by those skilled in the art, as well as other ways constructed by combining part of the components of the embodiments, are also included in the scope of the present application.

Claims

1. A vehicle side structure characterized by comprising: The support member and a polyurea coating layer arranged on at least part of the surface of the support member; The support member comprises a B-pillar, and the polyurea coating layer continuously covers the circumferential surface of the B-pillar in the circumferential direction.

2. The vehicle side structure according to claim 1, characterized by The polyurea coating layer covers at least part of the surface of the B-pillar in the vertical direction.

3. The vehicle side structure according to claim 2, characterized by The support member comprises a roof beam, a rocker beam and a B-pillar connecting the roof beam and the rocker beam, and the polyurea coating layer comprises a first part arranged on the lower part of the B-pillar and a second part arranged on the upper part of the rocker beam, and the first part and the second part are continuous.

4. The vehicle side structure according to claim 3, characterized by The polyurea coating layer satisfies at least one of the following conditions: (1) The elongation at break of the polyurea coating layer is 50% to 500%; (2) The tensile strength of the polyurea coating layer is 20 MPa to 70 MPa; (3) The tensile modulus of the polyurea coating layer is 50 MPa to 1200 MPa.

5. The vehicle side structure according to claim 1, wherein The thickness of the polyurea coating layer is 0.5 mm to 15 mm.

6. The vehicle side structure according to any one of claims 1 to 5, wherein The density of the polyurea coating is 1.0 g / cm 3 -1.5 g / cm 3 .

7. A vehicle characterized by comprising: The vehicle side structure according to any one of claims 1 to 6.

8. The vehicle of claim 7, wherein, The vehicle is a new energy vehicle.

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