A rocker reinforcement structure, a rocker assembly, and a method of assembling a rocker assembly

Abstract

The application relates to the field of automobile door sills, in particular to a door sill reinforcing structure, a door sill assembly and an assembling method of the door sill assembly, which comprises a reinforcing profile, the reinforcing profile comprises a first profile arranged on a door sill inner plate, and the first profile is slidably connected with a second profile; the strength of the second profile is less than that of the first profile; the application discloses a door sill reinforcing structure, the two-section profile structure greatly increases the overall structure of the door sill; additionally, the first profile and the second profile are movably connected in the application, which facilitates subsequent collapse protection; meanwhile, the strength of the second profile is less than that of the first profile in the application, the second profile is pre-collapsed after subsequent collision, and good buffering and protection effects are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile door sill, in particular to a door sill reinforcing structure, a door sill assembly and an assembling method of the door sill assembly. BACKGROUND

[0002] As a common transportation tool for family, the automobile often has a small offset collision due to the self-protection consciousness of the user in actual use.

[0003] Meanwhile, the small offset 25% collision has a small overlap and a few energy transmission paths.

[0004] The front longitudinal beam basically does not participate in deformation and energy absorption, and the paths that truly participate in energy absorption mainly include shotgun, hinge column and door sill.

[0005] Therefore, in order to avoid the problem that the door sill assembly deforms and affects the normal opening of the door or the safety of the passengers in the passenger compartment when a small offset collision occurs.

[0006] It is necessary to optimize the design of the existing door sill assembly. SUMMARY

[0007] The purpose of the present application is to provide a door sill reinforcing structure with large structural strength and self-collapse energy.

[0008] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0009] A door sill reinforcing structure, comprising a reinforcing profile, the reinforcing profile comprising a first profile provided on a door sill inner panel, and a second profile slidingly connected to the first profile; the second profile has a strength less than that of the first profile.

[0010] The first profile is internally hollow to form a sliding channel cavity; the second profile is inserted into the end of the sliding channel cavity; the thickness of the second profile close to one end of the first profile is less than the thickness of the second profile away from the other end of the first profile.

[0011] The second profile is connected to the first profile at one end, and is connected to the door sill inner panel through an end plate mechanism at the other end; the end plate mechanism comprises an end plate body, the end plate body comprises a longitudinal plate and a transverse plate, the longitudinal plate is connected to the door sill inner panel through the transverse plate; the longitudinal plate is connected to the second profile.

[0012] The vertical section of the second profile is an isosceles trapezoid.

[0013] The second profile comprises a one-layer profile and a two-layer profile, the one-layer profile and the two-layer profile are oppositely arranged, and the end plate mechanism is connected to the first profile through the one-layer profile and the two-layer profile.

[0014] The one-layer profile and the two-layer profile are symmetrically distributed with intervals; the one-layer profile and the two-layer profile form an assembly gap; the one-layer profile and the two-layer profile are both in a right-angled trapezoidal structure in a vertical section; and the side surfaces of the one-layer profile and the two-layer profile that are close to each other are arranged in parallel.

[0015] The slide cavity is provided with a support horizontal plate; and the thickness of the support horizontal plate is not greater than the assembly gap.

[0016] The one-layer profile and the two-layer profile are both connected with the first profile through a slide rail part; the slide rail part comprises a guide groove arranged on the one-layer profile or the two-layer profile and a positioning bolt arranged on the first profile.

[0017] A rocker assembly comprises a rocker inner panel, and the rocker reinforcement structure is arranged on the rocker inner panel.

[0018] An assembly method of a rocker assembly, comprising the following steps:

[0019] Step 1: selecting a first profile, a second profile and an end plate body with appropriate sizes;

[0020] Step 2: connecting the first profile to the rocker inner panel first; then connecting the end plate body and the second profile to the first profile; and then fixing the end plate body to the rocker inner panel after the connection;

[0021] Step 3: after the completion of Step 2, the rocker reinforcement structure in one rocker assembly is installed, and if it is necessary to repeatedly install the rocker reinforcement structure, Steps 1-2 can be repeated.

[0022] The advantages of the present application are as follows:

[0023] The present application discloses a rocker reinforcement structure, which greatly increases the overall structure of the rocker through a two-segment profile structure; additionally, the first profile and the second profile are movably connected, which facilitates subsequent collapse protection; and in the present application, the strength of the second profile is less than that of the first profile, so that the second profile is pre-collapsed after a subsequent collision, thereby achieving good buffering and protection effects. BRIEF DESCRIPTION OF DRAWINGS

[0024] The contents expressed by each drawing in the specification of the present application and the marks in the drawings are briefly described as follows:

[0025] Figure 1 It is a structural schematic diagram of the present application.

[0026] Figure 2 It is an exploded view of the present application.

[0027] Figure 3 It is a structural schematic diagram of the present application when the first profile is connected with the second profile through a slide rail part.

[0028] Figure 4 It is the local structure schematic view of the second section bar and the end plate body in the application.

[0029] Figure 5 It is the structure schematic view of the first section bar in the application.

[0030] The marks in the above-mentioned drawings are as follows:

[0031] 1, reinforcing section bar, 11, first section bar, 12, second section bar, 13, end plate body, 2, door sill inner plate, 3, vehicle body hinge pillar. DETAILED DESCRIPTION

[0032] The specific embodiments of the application will be further described in detail below with reference to the drawings.

[0033] A door sill reinforcing structure, comprising a reinforcing section bar 1, the reinforcing section bar 1 comprising a first section bar 11 arranged on a door sill inner plate 2, the first section bar 11 being slidably connected with a second section bar 12; the second section bar 12 having a strength less than that of the first section bar 12; the application discloses a door sill reinforcing structure, the application greatly increases the overall structure of the door sill through a two-section section bar structure; in addition, the first section bar 11 and the second section bar 12 are movably connected in the application, which facilitates subsequent collapse protection; in addition, the second section bar 12 has a strength less than that of the first section bar 12 in the application, so that the second section bar 12 is pre-collapsed after subsequent collision, thereby achieving good buffering and protection effects.

[0034] In addition, the structure is optimized, and the optimization mode can be referred to below, of course, other structures can also be used, and specific selection can be made according to needs; the main purpose is to enable the second section bar to move longitudinally along the first section bar; based on such a design, the second section bar moves backward after collision in actual use, the first section bar and the second section bar gradually produce interference fit, the contact force is increased, the function of limiting the backward movement of the door sill is achieved, and in addition, due to the backward movement of the second section bar, the front part of the door sill and the rear part of the second section bar also increase local deformation space, thereby achieving good energy absorption and protection effects.

[0035] Specifically, the door sill reinforcing structure disclosed by the application mainly comprises a reinforcing section bar 1, the reinforcing section bar 1 is connected to a door sill inner plate 2, and the structure strength of the door sill assembly is well increased; in addition, the reinforcing section bar 1 comprises a first section bar 11 and a second section bar 12 arranged on the door sill inner plate 2 in the application, the arrangement of the first section bar 11 and the second section bar 12 achieves good reinforcing effects, and the purpose is to ensure the overall structural strength of the door sill reinforcing structure; in addition, the first section bar 11 is slidably connected with the second section bar 12 in the application; the second section bar 12 has a strength less than that of the first section bar 12; the second section bar 12 serves as a collapse section during subsequent use, thereby facilitating subsequent collapse protection.

[0036] In addition, the first profile 11 and the second profile 12 can slide relative to each other in the present application, and through such an arrangement, the first profile 11 and the second profile 12 can move relative to each other, which is convenient for subsequent energy absorption and collapse.

[0037] Further, the first profile 11 is internally hollow to form a slide cavity 11-1 in the present application; the arrangement of the slide cavity 11-1 facilitates the insertion and installation of the second profile 12 at the end of the first profile 11. Specifically, in use, the second profile 12 is inserted at the end of the slide cavity 11-1; such an arrangement facilitates the connection between the first profile 11 and the second profile 12; at the same time, in the present application, the thickness of the end of the second profile 12 close to the first profile 11 is smaller than the thickness of the end of the second profile 12 away from the first profile 11; such an arrangement makes the thickness of one end of the second profile 12 larger and the thickness of the other end smaller, and when the end of the second profile 12 with the larger thickness is pressed against the first profile 11, it plays a good energy absorption role, thereby improving the crash performance of the rocker assembly.

[0038] Further, in the present application, one end of the second profile 12 is connected with the first profile 11, and the other end is connected with the rocker inner panel 2 through an end plate mechanism; the end plate mechanism comprises an end plate body 13, and the present application facilitates the connection between the second profile 12 and the rocker inner panel 2 through the arrangement of the end plate body 13; in addition, in the present application, the end plate body 13 comprises a longitudinal plate and a transverse plate, the longitudinal plate is connected with the rocker inner panel 2 through the transverse plate; the longitudinal plate is connected with the second profile 12; the longitudinal plate and the transverse plate are arranged perpendicular to each other in the present application, the transverse plate is connected with the rocker inner panel 2, and the longitudinal plate is connected with the second profile 12; through such a connection mode, the arrangement and placement of the second profile 12 on the rocker inner panel 2 are facilitated.

[0039] In addition, in actual arrangement, the second profile is only attached to the rocker inner panel without a direct connection therebetween, one end of the second profile is connected with the first profile and the rocker inner panel, and the other end is connected with the rocker inner panel through the above-mentioned end plate body; based on the above-mentioned connection mode, the subsequent buffer sliding of the second profile in the first profile can be better avoided while achieving the connection between the reinforcing profile and the rocker inner panel.

[0040] Further, in the present application, the vertical section of the second profile 12 is isosceles trapezoidal; through such an arrangement, the second profile 12 and the first profile 11 are equivalent to an interference fit, and when a collision occurs, the first profile 11 and the second profile 12 gradually produce an interference fit due to the cross-sectional size, the resistance gradually increases, the rear movement of the rocker support is finally effectively limited, and the front end provides sufficient crushing energy absorption space, thereby improving the small offset crash performance.

[0041] Further, in the application, the second profile 12 comprises a one-layer profile 121 and a two-layer profile 122, which are oppositely arranged, and the end plate mechanism is connected with the first profile 11 through the one-layer profile 121 and the two-layer profile 122; the second profile 12 comprises the one-layer profile 121 and the two-layer profile 122, which are independently produced in actual arrangement, and the one-layer profile 121 and the two-layer profile 122 are of the same structure, so that the second profile 12 can be assembled by inversely assembling the one-layer profile 121 and the two-layer profile 122, which reduces the types of parts and greatly improves the assembly efficiency of the second profile 12; meanwhile, the one-layer profile 121 and the two-layer profile 122 are conveniently inserted into the first profile, which reduces the difficulty of the butt joint of the second profile and the support horizontal plate in the first profile; in the specific installation and fixation, the one-layer profile and the two-layer profile are inserted into the sliding cavities and are arranged by the support horizontal plate; the surfaces of the one-layer profile and the two-layer profile in contact with the support horizontal plate are planes, that is, the side surfaces of the one-layer profile and the two-layer profile in contact with the support horizontal plate are arranged in parallel with the support horizontal plate, which can play a good guiding role in the subsequent assembly, can ensure the correctness of the assembly direction of the one-layer profile and the two-layer profile, avoid reverse assembly, and ensure the linearity of the movement of the one-layer profile and the two-layer profile in assembly and use; in order to better play the guiding role, the support horizontal plate is required to be the plate structure with the maximum strength in the entire reinforcing profile.

[0042] Further, in the application, the one-layer profile 121 and the two-layer profile 122 are symmetrically distributed in intervals; the assembly gap is formed between the one-layer profile 121 and the two-layer profile 122; the assembly gap is arranged to make the one-layer profile 121 and the two-layer profile 122 be distributed in intervals, which plays a good avoiding role and avoids the movement interference between the second profile 12 and the support horizontal plate 11-2 in the first profile 11 when the second profile 12 moves relative to the first profile 11.

[0043] Meanwhile, in the application, the vertical sections of the one-layer profile 121 and the two-layer profile 122 are right-angled trapezoidal structures; the side surfaces of the one-layer profile 121 and the two-layer profile 122 close to each other are arranged in parallel with each other; through such an arrangement, the side surface close to each other of the one-layer profile 121 and the two-layer profile 122 can be in contact with the support horizontal plate 11-2 in the first profile 11, which plays a good positioning role, facilitates to ensure the stability and accuracy of the one-layer profile 121 and the two-layer profile 122 arranged at the end of the first profile 11, avoids the inclination of the single one-layer profile 121 or the two-layer profile, and affects the linearity of the movement of the second profile 12 and the collapse performance.

[0044] Further, the slide cavity 11-1 in the application is provided with a support cross plate 11-2; the support cross plate 11-2 increases the structural strength of the first profile 11, and also serves as a guide plate to ensure the linearity of the collapse direction of the second profile 12, ensure the stability of the movement of the rocker assembly when the second profile 12 collapses, and reduce the damage to the passengers caused by transverse collapse; at the same time, the thickness of the support cross plate 11-2 is not greater than the assembly gap; such arrangement can reduce the influence of the support cross plate 11-2 on the normal collapse of the second profile 12.

[0045] Further, the one profile 121 and the two profiles 122 in the application are connected with the first profile 11 through the slide rail part; the slide rail part includes a guide groove 12-1 arranged on the one profile 121 or the two profiles 122 and a positioning bolt 12-2 arranged on the first profile 11; through the arrangement of the slide rail part, the connection between the first profile 11 and the second profile 12 is facilitated, and the subsequent collapse operation of the second profile 12 is greatly facilitated; in actual use, each first profile 11 is connected with the one profile 121 or the two profiles 122 through at least two positioning bolts 12-2, and the two positioning bolts 12-2 are distributed at intervals; through such an arrangement, the linearity of the movement of the second profile 12 is greatly ensured; and the collapse of the one profile and the two profiles into the first profile is not affected.

[0046] In addition, the arrangement of the slide rail part can also increase the application range of the application, because the basic role of the rocker reinforcement structure in the application is to increase the overall structural strength of the rocker inner panel; in actual use, the two ends of the first profile and the second profile do not need to be pressed, and the second profile can move relative to the first profile, that is, the length of the reinforcement profile can be changed as needed, thereby making the rocker reinforcement structure disclosed in the application applicable to different vehicle models, and greatly improving the application range of the application.

[0047] A rocker assembly includes a rocker inner panel 2, and the rocker assembly is provided with the rocker reinforcement structure; the rocker assembly disclosed in the application greatly increases the structural strength of the rocker assembly through the arrangement of the rocker reinforcement structure.

[0048] An assembly method of a rocker assembly, the assembly method includes the following steps:

[0049] Step 1: selecting a first profile, a second profile and an end plate body with appropriate sizes;

[0050] Step 2: first, connecting the first profile to the rocker inner panel; then, connecting the end plate body and the second profile to the first profile; after connection, fixing the end plate body to the rocker inner panel;

[0051] Step 3: after step 2 is completed, the rocker reinforcement structure in a rocker assembly is installed, if it is necessary to repeat the installation of the rocker reinforcement structure, the above steps 1-2 can be repeated.

[0052] The specific steps are:

[0053] Step 1: select the first profile 11, the second profile 12 and the end plate body 13 of appropriate size;

[0054] Step 2: first, connect the end plate body 13 in step 1 with the second profile 12 to form a front-end profile group; at the same time, connect the first profile 11 on the rocker inner plate 2;

[0055] Step 3: after step 2 is completed, insert the front-end profile group into the end of the first profile 11; and use the positioning bolt 12-2 to insert and fix and limit;

[0056] Step 4: after step 3 is completed, connect the end plate body 13 to the rocker inner plate 2;

[0057] Step 5: after step 4 is completed, the rocker reinforcement structure in a rocker assembly is installed, if it is necessary to repeat the installation of the rocker reinforcement structure, the above steps 1-4 can be repeated.

[0058] The present application facilitates the assembly of the rocker assembly by the above assembly method.

[0059] In addition, in the present application, the end plate body 13 is first connected with the second profile 12 to form a front-end profile group; at the same time, the first profile 11 is connected on the rocker inner plate 2; such an operation mode can be carried out synchronously in two steps, reducing the assembly time of the reinforcing profile, and in the present application, the front-end profile group is inserted into the end of the first profile 11; and the positioning bolt 12-2 is inserted and fixed and limited; in the present application, the first profile is first connected on the rocker inner plate, which plays a role of positioning, and then the end plate body 13 is connected with the second profile 12 to form a front-end profile group inserted on the first profile, which facilitates the butt joint between the first profile and the second profile.

[0060] By adopting the above steps, and in combination with the relative sliding of the first profile and the second profile, the structure precision requirement of the overall component is low in actual installation, that is, after the positions of the first profile and the end plate body are determined, as long as the first profile and the second profile are in the inserted state, it will not affect the normal use of the present application; therefore, even if the first profile installation position and the end plate body installation position have a certain deviation due to design, it can be compensated by the second profile, so as to reduce the rework probability to a certain extent and improve the assembly efficiency; at the same time, it basically will not affect the use effect of the rocker assembly.

[0061] Specifically:

[0062] The application discloses a door sill reinforcing structure.

[0063] The door sill reinforcing structure mainly comprises two aluminum profiles and an L-shaped end plate, is simple in structure, convenient to install and capable of effectively controlling structural deformation.

[0064] In a front small offset collision, a tire is impacted by a strong force and invades and extrudes a front hinge pillar and the door sill, thereby affecting the safety of cabin members.

[0065] The door sill reinforcing structure is divided into two sections, the two sections are connected through embedding, and the connection between the two sections and the door sill inner plate is realized through bolts and rivets.

[0066] The door sill reinforcing structure can effectively control the deformation of the door sill structure in the front small offset collision, guarantee the load-bearing capacity of the door sill, limit the invasion range, provide a front crushing space through the slippage of the structure, guarantee the front end of the hinge pillar of the automobile to be crushed and deformed, and guarantee the front end of the door sill mechanism to slip backward while bearing load, avoid the crushing space, and gradually form an interference fit between the second profile structure and the first profile structure, so that the structure provides more and more support force, thereby guaranteeing that the door sill structure does not excessively invade backward and invade the inside of the passenger cabin, and effectively guaranteeing the stability of the automobile body structure and the passenger space.

[0067] The door sill reinforcing structure can effectively control the deformation of the door sill structure in the front small offset collision, guarantee the load-bearing capacity of the door sill, limit the invasion range, provide a front crushing space through the slippage of the structure, guarantee the front end of the hinge pillar of the automobile to be crushed and deformed, and guarantee the front end of the door sill mechanism to slip backward while bearing load, avoid the crushing space, and gradually form an interference fit between the second profile structure and the first profile structure, so that the structure provides more and more support force, thereby guaranteeing that the door sill structure does not excessively invade backward and invade the inside of the passenger cabin, and effectively guaranteeing the stability of the automobile body structure and the passenger space.

[0068] Further, the first profile and the second profile are two-embeddedly assembled, the second profile structure can be adjusted in length and structure form according to different vehicle models, the performance requirements of different vehicle models on the same platform or different vehicle models on different platforms are met, the development cycle and cost are reduced, and the platformization and generalization degree are high.

[0069] In the application, the second profile is designed in a front-large-and-rear-small variable cross-section mode to be embedded into the cavity of the first profile, and the L-shaped end plate is connected with the second profile through welding.

[0070] The door sill reinforcing structure is integrally connected to the door sill inner plate of the automobile body through riveting and bolting, the second profile is provided with a guide groove in the rear section to realize the guiding effect of the backward slippage of the second profile in the collision.

[0071] In the normal state, riveting and bolts can effectively ensure the strength and durability of the structure, in the small offset collision, the second profile 12 follows the hinge column and the front end of the rocker inner plate 2 to slide backward along the guide groove 12-1, realizing the avoidance of the front crushing space, and then with the deepening of the compression, the second profile 12 gradually realizes the interference fit with the first profile 11, the bearing capacity increases, effectively limiting the rear movement of the front end structure of the rocker.

[0072] Further, the L-shaped end plate (the L-shaped end plate is the end plate body 13 in the above) and the first profile 11 are platformized general design, and the second profile 12 is replaceable design, which can adjust the cross-sectional size and length of the second profile 12 structure according to the actual needs of different platforms of vehicle bodies, so as to adapt to the performance requirements of different vehicle models, high flexibility, saving development cycle and cost.

[0073] The beneficial effects of the present application are:

[0074] This structure can maintain good connection under the condition of meeting strength fatigue during normal driving;

[0075] In the small offset collision, the structure realizes interference fit through the backward sliding of the front end, gradually increases the supporting force, and protects the rocker;

[0076] Through the structure sliding, the local space of the rocker front part is avoided, the front end local crushing energy absorption is realized, the rear end bearing does not bend and deforms reasonably, and the internal passengers are protected;

[0077] The platform degree is high, the segmented design structure is simple, the flexibility is high, the aluminum second profile 12 structure is quickly replaced, the performance requirements of different vehicle models are met, and the development cycle and cost are reduced.

[0078] In the implementation:

[0079] The rocker reinforcement structure 1 mainly comprises an end plate body 13, a second profile 12 and a first profile 11, and the parts are simple to form and low in weight.

[0080] The structure of the present application is spliced and fixed on the rocker inner plate 2 through bolts and riveting.

[0081] The L-shaped end plate and the second profile 12 are integrally connected by welding; the first profile 11 adopts a character-shaped structure with a supporting horizontal plate 11-2 in the middle.

[0082] The second profile 12 is divided into two aluminum materials, which are both front large and rear small gradually changing cross sections, wherein the front end cross section size is large and equivalent to the L-shaped end plate, and the rear end cross section is smaller than the internal cavity size of the first profile 11, realizing embedded assembly, and the gap between the upper and lower aluminum materials is greater than the thickness of the middle partition plate 11 of the first profile 11.

[0083] Bolts fix the second profile 12 and the first profile 11 to the inner sill plate 2. At the same time, the second profile 12 has an elongated guide groove dug at the bolt position to provide sliding guidance for the second profile 12 to slide backward due to compression in small offset collisions.

[0084] During a small offset collision, the tire moves backward and compresses the hinge pillar 3 of the vehicle body. As the hinge pillar 3 and the front end of the sill are compressed, the L-shaped end plate 13 and the second profile 12 slide backward along the guide groove in the initial stage. Then, due to the cross-sectional dimensions, the second profile 12 and the first profile 11 gradually form an interference fit, and the resistance gradually increases. Finally, the rearward movement of the sill bracket is effectively limited, while the front end provides sufficient crushing energy absorption space, thereby improving the small offset collision performance.

[0085] Furthermore, due to differences in body design structure, weight, and spatial arrangement, the collision energy also varies significantly. In this case, the second profile 12 is redesigned according to different body design requirements, including length and cross-sectional dimensions, and reassembled with the end plate 13 and the first profile 11. This approach not only meets the performance requirements of different vehicle models but also provides high flexibility.

[0086] Both the end plate 13 and the first profile 11 are based on a platform design, which reduces the development cycle and saves development costs.

[0087] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A threshold reinforcement structure, characterized in that, The reinforcement profile includes a first profile disposed on the inner sill plate, and a second profile is slidably connected to the first profile; the strength of the second profile is less than the strength of the first profile. Upon impact, the second profile collapsed beforehand; The first profile has a hollow interior forming a slide cavity; the second profile is inserted into the end of the slide cavity; the thickness of the second profile near the first profile is less than the thickness of the second profile away from the first profile. One end of the second profile is connected to the first profile, and the other end is connected to the inner sill plate through an end plate mechanism; the second profile and the inner sill plate are in contact with each other; the first profile and the second profile can slide against each other; The second profile includes a first profile and a second profile, which are arranged opposite to each other. The end plate mechanism is connected to the first profile through both the first profile and the second profile. The first-layer profile and the second-layer profile are symmetrically distributed at intervals; an assembly gap is formed between the first-layer profile and the second-layer profile; the vertical cross-sections of the first-layer profile and the second-layer profile are both right-angled trapezoidal structures; the sides of the first-layer profile and the second-layer profile that are close to each other are arranged parallel to each other; The slide cavity is provided with a support plate; the thickness of the support plate is not greater than the assembly gap. The first and second profiles are close to each other and their sides are attached to the supporting cross plate inside the first profile; The end plate mechanism includes an end plate body, which includes a longitudinal plate and a transverse plate. The longitudinal plate is connected to the inner sill plate via the transverse plate. The longitudinal plate is connected to a second profile. During assembly: First, connect the end plate to the second profile to form the front profile assembly; at the same time, connect the first profile to the inner sill plate; then insert the front profile assembly into the end of the first profile; and use positioning bolts to fix and limit it.

2. The threshold reinforcement structure according to claim 1, characterized in that, The vertical cross-section of the second profile is an isosceles trapezoid.

3. The threshold reinforcement structure according to claim 1, characterized in that, Both the first-layer profile and the second-layer profile are connected to the first profile via a slide rail; the slide rail includes a guide groove provided on the first-layer profile or the second-layer profile and a positioning bolt provided on the first profile.

4. A door sill assembly, characterized in that, Includes an inner sill plate, wherein the inner sill plate is provided with a sill reinforcement structure as described in any one of claims 1-3.

5. A method for assembling the sill assembly as described in claim 4, characterized in that, The assembly method includes the following steps: Step 1: Select the first profile, the second profile, and the end plate of appropriate dimensions; Step 2: First, connect the first profile to the inner door sill panel; then connect the end plate to the second profile on the first profile; after connection, fix the end plate to the inner door sill panel. Step 3: After completing Step 2, the sill reinforcement structure in a sill assembly is installed. If the sill reinforcement structure needs to be installed again, repeat Steps 1-2 above.

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