Floor longitudinal beam and automobile

Abstract

The invention discloses a floor longitudinal beam and an automobile, and relates to the technical field of electric automobiles, the floor longitudinal beam is used for being connected to the bottom side of an automobile body, the floor longitudinal beam comprises a hanging section and two welding sections correspondingly located on the two sides of the hanging section in the transverse direction, the hanging section is arranged in a downwards-concave mode relative to the two welding sections, and the two welding sections are connected with the hanging section. The upper sides of the two welding sections are used for being welded to the bottom of a vehicle body, and the hanging section is used for hanging a battery pack; the height difference between the upper side of the welding section and the lower side of the hanging section is H, and H ranges from 60 mm to 120 mm. According to the technical scheme provided by the invention, the failure of the welding point of the floor longitudinal beam is improved on the premise of ensuring that the overall weight of the vehicle body is not increased.

Description

Technical Field

[0001] The invention relates to the technical field of electric vehicles, and in particular to a floor longitudinal beam and an automobile. Background Art

[0002] Existing PHEV models need to take measures for front and rear exhaust layout and take into account the need to increase the energy density of the battery, so a floor longitudinal beam is added on the passenger side to reserve space for the exhaust pipe and to serve as a side beam for mounting the power battery. However, due to the characteristics of the offset mounted battery pack, during a vehicle side column collision, while ensuring that the overall weight of the vehicle body does not increase, the floor longitudinal beam is prone to welding point failure. Summary of the invention

[0003] The main purpose of the present invention is to provide a floor longitudinal beam and a car, aiming to improve the failure of the welding points of the floor longitudinal beam without increasing the overall weight of the car body.

[0004] To achieve the above object, the present invention provides a floor longitudinal beam, which is used to be connected to the bottom side of a vehicle body, and the floor longitudinal beam includes a hanging section and two welding sections corresponding to the two sides of the hanging section in the transverse direction, wherein the hanging section is concave relative to the two welding sections, the upper sides of the two welding sections are used to be welded to the bottom of the vehicle body, and the hanging section is used to mount a battery pack;

[0005] Wherein, the height difference between the upper side of the welding section and the lower side of the hanging section is H, and H is 60mm-120mm.

[0006] In one embodiment, H is 70 mm-90 mm.

[0007] In one embodiment, the floor longitudinal beams are provided with chamfered corners.

[0008] In one embodiment, the thickness of the hanging section is T1, and T1 is 1.5 mm-2.5 mm; and / or,

[0009] The thickness of the welding section is T2, and T2 is 1.5 mm-2.5 mm.

[0010] In one embodiment, the floor longitudinal beam is integrally formed.

[0011] In one embodiment, the T1 is equal to the T2.

[0012] In one embodiment, the TI is 2.0 mm, and the T2 is 2.0 mm.

[0013] In one embodiment, the floor longitudinal beam is provided with a plurality of welding points, the plurality of welding points are distributed at intervals, and the welding section is welded to the bottom of the vehicle body through the plurality of welding points.

[0014] In one embodiment, there is a distance W between the two welding sections, and W is 50 mm-90 mm.

[0015] The present invention also proposes a car, comprising a floor longitudinal beam, the floor longitudinal beam comprising a hanging section and two welding sections corresponding to the two sides of the hanging section in the transverse direction, wherein the hanging section is concave relative to the two welding sections, the upper sides of the two welding sections are used to be welded to the bottom of the vehicle body, and the hanging section is used to mount a battery pack; wherein the height difference between the upper side of the welding section and the lower side of the hanging section is H, and H is 60mm-120mm.

[0016] The technical solution of the present invention can change the geometric shape of the stress-bearing area during the collision of the vehicle side column by adjusting the height difference between the welding section and the hanging section, reduce the formation of high stress concentration areas, and thus reduce the risk of cracking of the welding points and improve the failure of the floor longitudinal beam welding points. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of an embodiment of a floor longitudinal beam provided by the present invention when in use;

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the middle floor longitudinal beam;

[0020] Figure 3 for Figure 1 Schematic diagram of the cross section of the middle floor longitudinal beam;

[0021] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of the floor longitudinal beam in.

[0022] Description of Figure Numbers:

[0023] 1. Floor longitudinal beam; 11. Hanging section; 12. Welding section.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] Existing PHEV models need to take measures for the front and rear exhaust layout and take into account the need to increase the energy density of the battery. A floor longitudinal beam 1 is added on the passenger side to reserve space for the exhaust pipe on the one hand and to serve as a side beam for mounting the power battery on the other hand. However, due to the characteristics of the offset mounted battery pack, during the collision of the vehicle side column, while ensuring that the overall weight of the vehicle body does not increase, the floor longitudinal beam 1 is prone to welding point failure.

[0029] In order to solve the above technical problems, Figures 1 to 4As shown, the present invention proposes a floor longitudinal beam 1 for connecting to the bottom side of a vehicle body, the floor longitudinal beam 1 comprises a hanging section 11, and two welding sections 12 correspondingly located on both sides of the hanging section 11 in the transverse direction, wherein the hanging section 11 is concave relative to the two welding sections 12, the upper sides of the two welding sections 12 are used for welding to the bottom of the vehicle body, and the hanging section 11 is used for mounting a battery pack; wherein the height difference between the upper side of the welding section 12 and the lower side of the hanging section 11 is H, and H is 60mm-120mm.

[0030] The technical solution of the present invention can change the geometric shape of the stress-bearing area during the collision of the vehicle side column by adjusting the height difference between the welding section 12 and the hanging section 11, reduce the formation of high stress concentration areas, and thus reduce the risk of cracking of the welding points, thereby improving the failure of the welding points of the floor longitudinal beam 1.

[0031] It is understandable that during a collision, the lateral force generated by the collision of the side pillar of the vehicle can be transmitted to the body structure through the floor longitudinal beam 1. By designing different H mounting methods, energy distribution can be optimized, thereby improving the energy absorption capacity of the entire body and reducing the impact on the welding points.

[0032] Specifically, in one embodiment, H is 70 mm-90 mm.

[0033] Such an arrangement can reduce the risk of cracking of the welding points and improve the failure of the welding points of the floor longitudinal beam 1.

[0034] Specifically, in one embodiment, the floor longitudinal beam 1 is provided with a chamfered corner at the folding corner.

[0035] Such arrangement helps to reduce stress concentration at the corners through the chamfer design, and by dispersing the stress, the structural strength of the entire floor longitudinal beam 1 is enhanced, thereby improving the collision resistance of the vehicle.

[0036] It is understandable that an increase in thickness will increase the stiffness of the material, but the increase in stiffness is not proportional to the thickness. For the cross section of the floor longitudinal beam 1, the stiffness can be simplified as:, where t is the thickness of the sheet metal. An increase in thickness can improve the local load-bearing capacity, but in high-speed collisions, the effect of increased thickness on stiffness improvement is limited. On the other hand, increasing thickness may improve local strength, but under strong impact, stress concentration will still occur, and these stress concentration areas may cause brittle fracture of the material, reducing the overall energy absorption capacity.

[0037] In view of this, in one embodiment, the thickness of the hanging segment 11 is T1, and T1 is 1.5 mm-2.5 mm. Such a configuration can improve the connection strength of the hanging segment 11.

[0038] It can be transferred that, in one embodiment, the thickness of the welding section 12 is T2, and the thickness T2 is 1.5 mm-2.5 mm. Such a setting can improve the connection strength of the welding section 12.

[0039] In one embodiment, the floor longitudinal beam 1 is integrally formed.

[0040] Such a configuration improves the strength of the floor longitudinal beam 1. Since the integrally formed floor longitudinal beam 1 has no welded seams, it has a higher overall structural strength than the multi-section welded floor longitudinal beam 1. In addition, the integral forming reduces the number of assembly steps and the time required, reduces the production cost, and reduces the potential failures caused by welding or other connection methods.

[0041] In one embodiment, the T1 is equal to the T2.

[0042] Such an arrangement can ensure that each part of the floor longitudinal beam 1 is subjected to uniform force, thereby improving the strength of the floor longitudinal beam 1 .

[0043] Specifically, in one embodiment, the TI is 2.0 mm, and the T2 is 2.0 mm.

[0044] Such an arrangement can improve the strength of the floor longitudinal beam 1 .

[0045] In one embodiment, the floor longitudinal beam 1 is provided with a plurality of welding points, the plurality of welding points are distributed at intervals, and the welding section 12 is welded to the bottom of the vehicle body through the plurality of welding points.

[0046] By setting a plurality of weld points at intervals, the stress borne by a single welding area can be dispersed to a plurality of points, thereby reducing the stress concentration borne by each weld point. This method can effectively alleviate the stress concentration caused by impact, reduce the risk of cracking, and thus improve the toughness of the floor longitudinal beam 1.

[0047] It is understandable that continuous welding tends to lead to greater thermal deformation, while spaced welds can reduce the size of the heat-affected zone, thereby alleviating welding deformation to ensure welding quality.

[0048] In one embodiment, there is a distance W between the two welding sections 12, and W is 50 mm-90 mm.

[0049] This arrangement can avoid the need for the battery pack and exhaust pipe to be placed on the passenger side of the PHEV model, so that the exhaust pipe will not be affected by heat damage, thereby improving the overall performance of the vehicle.

[0050] The present invention further provides a car, which includes a floor longitudinal beam 1. The specific structure of the floor longitudinal beam 1 refers to the above embodiments. Since the present car adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0051] The present invention also proposes an analysis and optimization method for a floor longitudinal beam 1 based on a side column collision condition, comprising the following steps:

[0052] Step S100: basic model building: determining the cross-sectional structure of the floor longitudinal beam 1, defining the layout position (ie, the W), forming the basic floor longitudinal beam 1 structure, and then establishing a basic collision model of the whole vehicle;

[0053] Step S200: limiting the working condition to 32 km / h 75° angle side column collision as a constraint condition;

[0054] Step S300: define key factor variables (ie, the H, the T1, and the T2) and bring them into the simulation software L-SDYNA solver.

[0055] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A floor longitudinal beam for connecting to the bottom side of a vehicle body, characterized in that: The floor longitudinal beam comprises a hanging section and two welding sections correspondingly located on both sides of the hanging section in the transverse direction, wherein the hanging section is concave relative to the two welding sections, the upper sides of the two welding sections are used to be welded to the bottom of the vehicle body, and the hanging section is used to mount the battery pack; Wherein, the height difference between the upper side of the welding section and the lower side of the hanging section is H, and H is 60mm-120mm.

2. The floor longitudinal beam according to claim 1, characterized in that The H is 70mm-90mm.

3. The floor longitudinal beam according to claim 2, characterized in that The floor longitudinal beams are provided with guide angles at the folded corners.

4. The floor stringer according to claim 1, characterized in that The thickness of the hanging section is T1, and T1 is 1.5 mm-2.5 mm; and / or, The thickness of the welding section is T2, and T2 is 1.5 mm-2.5 mm.

5. The floor stringer according to claims 1 to 4, characterized in that The floor longitudinal beam is integrally formed.

6. The floor stringer according to claim 4, characterized in that The T1 is equal to the T2 。 7. The floor stringer according to claim 6, characterized in that The TI is 2.0 mm, and the T2 is 2.0 mm.

8. The floor stringer according to claim 1, wherein: The floor longitudinal beam is provided with a plurality of welding points, the plurality of welding points are distributed at intervals, and the welding section is welded to the bottom of the vehicle body through the plurality of welding points.

9. The floor stringer according to claim 1, characterized in that There is a distance W between the two welding sections, and W is 50 mm-90 mm.

10. An automobile, characterized in that: The invention comprises a floor longitudinal beam as claimed in any one of claims 1 to 9.

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