CN218400154U

CN218400154U - Door additional strengthening and vehicle

Info

Publication number: CN218400154U
Application number: CN202222773752.4U
Authority: CN
Inventors: 岳志强
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2023-01-31
Anticipated expiration: 2032-10-20

Abstract

The utility model provides a door additional strengthening and vehicle, the utility model discloses a door additional strengthening, including first reinforcing plate, first reinforcing plate includes the board main part to and divide the preceding connecting plate and the back connecting plate of arranging board main part tip in. The front connecting plate is used for being connected to the upper portion of a front frame of the vehicle door inner plate, and the rear connecting plate is used for being connected to a connecting portion of a rear frame and a lower frame of the vehicle door inner plate. And the front connecting plate is provided with a front reinforcing rib which is formed by locally protruding one side of the front connecting plate back to the inner plate of the vehicle door. Door additional strengthening, the board main part both ends of the first reinforcing plate of setting are equipped with preceding connecting plate and back connecting plate, preceding connecting plate and back connecting plate are used for connecting the preceding frame upper portion and the connection position of after-frame and lower frame of door inner panel respectively, are favorable to the structural strength of whole enhancement door inner panel to it does benefit to the connection reliability that improves first reinforcing plate and door inner panel to set up anterior strengthening rib.

Description

Door additional strengthening and vehicle

Technical Field

The utility model relates to a door spare part technical field, in particular to door additional strengthening. And simultaneously, the utility model discloses still relate to an adopt this door additional strengthening's vehicle.

Background

With the increasing living standard, the automobile becomes an indispensable vehicle in life. When a vehicle runs, the excitation energy of a road surface and a power assembly excites the structural mode of a vehicle body plate to generate low-and-medium frequency vibration noise, and the low-and-medium frequency vibration noise can stress ears and irritability of drivers and passengers and can cause physiological reactions such as dizziness, nausea and the like for a long time.

The vehicle door is an important component of a vehicle, and not only can isolate the external interference of the vehicle, but also has the functions of reducing side impact and protecting passengers. Door assemblies typically include a door inner panel and a door outer panel with a reinforcement structure disposed between the door inner panel and the door outer panel to improve the strength of the door assembly. However, the inner plate structure of the vehicle door is an important large plate structure of the vehicle and is close to a passenger, and the excitation of a road surface and a power assembly easily causes the large plate to vibrate, so that the problem of vibration noise in the vehicle is caused.

At present, there are multiple additional strengthening among the correlation technique, general additional strengthening adopts the reinforcing plate, and the sheet metal component is generally chooseed for use to the reinforcing plate, but the intensity height of sheet metal component is also big, though can play the effect of strengthening intensity to a certain extent, nevertheless along with people to the promotion of vehicle performance requirement, the reinforcing effect of current additional strengthening is difficult to satisfy people to the performance demand of vehicle.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a vehicle door reinforcing structure to improve the structural strength of a vehicle door inner panel.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a door reinforcing structure provided on an outer side of a door inner panel, the reinforcing structure comprising:

the first reinforcing plate comprises a plate main body, a front connecting plate and a rear connecting plate, wherein the front connecting plate and the rear connecting plate are respectively arranged at the end part of the plate main body;

the front connecting plate is provided with a front reinforcing rib, and the front reinforcing rib is formed by protruding one side of the front connecting plate, which is partially back to the inner plate of the vehicle door.

Furthermore, the cross section of the plate main body is M-shaped, a first side bulge is arranged on the upper side of the rear connecting plate, a second side bulge is arranged on the lower side of the rear connecting plate, and the first side bulge and the second side bulge are formed by outwards extending the edge of the rear connecting plate; the first side portion protrusion is triangular, and the second side portion protrusion is arched.

Furthermore, the reinforcing structure also comprises a second reinforcing plate arranged at the upper frame of the vehicle door inner plate, and a cavity extending along the length direction of the vehicle is formed between the second reinforcing plate and the vehicle door inner plate; the middle rear part of the second reinforcing plate is formed with a lower protrusion extending downward.

Furthermore, a plurality of upper reinforcing parts are arranged at the upper part of the second reinforcing plate, and are sequentially arranged at intervals along the length direction of the vehicle; the upper reinforcement part includes an upper protrusion or an upper groove formed on the second reinforcement plate.

Furthermore, the second reinforcing plate is provided with an upper lightening hole positioned at the upper part of the second reinforcing plate and a lower lightening hole positioned on the lower bulge, and the shapes of the upper lightening hole and the lower lightening hole are all one of triangle, rectangle and ellipse; the rear portion of the second reinforcing plate is provided with a plurality of rear end bulges, the rear end bulges are arranged at intervals along the height direction of the vehicle, and the rear end bulges are formed by outwards extending the rear edge of the second reinforcing plate.

Furthermore, the upper portion of the second reinforcing plate is provided with two upper protrusions and an upper groove, the two upper protrusions include a first upper protrusion arranged at the front end of the second reinforcing plate and a second upper protrusion arranged at the rear end of the second reinforcing plate, and the upper lightening hole and the upper groove are arranged between the first upper protrusion and the second upper protrusion.

Furthermore, the reinforcing structure further comprises a third reinforcing plate arranged in the middle of the rear frame, a through hole is formed in the third reinforcing plate, and the through hole is arranged corresponding to a door lock mounting hole (401) in the inner plate of the vehicle door.

Furthermore, the reinforcing structure also comprises a fourth reinforcing plate arranged on the front frame, and the front connecting plate is lapped on the fourth reinforcing plate; the front part of the fourth reinforcing plate is provided with a first bulge, and the first bulge is formed by extending the front edge of the fourth reinforcing plate outwards; and/or a second bulge is arranged at the rear part of the fourth reinforcing plate, and the second bulge is formed by extending the rear edge of the fourth reinforcing plate outwards; the first bulges and the second bulges are arranged at intervals along the height direction of the vehicle.

Furthermore, the reinforcing structure also comprises a fifth reinforcing plate arranged on the front frame, and the fourth reinforcing plate and the fifth reinforcing plate are arranged at intervals up and down; the front part of the fifth reinforcing plate is provided with a first opening which is arched, and/or the rear part of the fifth reinforcing plate is provided with a second opening which is arched.

Compared with the prior art, the utility model discloses following advantage has:

door additional strengthening, the board main part both ends of the first reinforcing plate of setting are equipped with preceding connecting plate and back connecting plate, preceding connecting plate and back connecting plate are used for connecting the preceding frame upper portion and the connection position of after-frame and lower frame of door inner panel respectively, are favorable to the structural strength of whole enhancement door inner panel to it does benefit to the connection reliability that improves first reinforcing plate and door inner panel to set up anterior strengthening rib.

In addition, the plate main body is arranged to be M-shaped, the double-arch-shaped characteristic of an M-shaped structure is utilized, the structural strength of the plate main body is improved, and meanwhile, the integral structural strength of the vehicle door is improved. The upper and lower both sides of back connecting plate are equipped with first side portion arch and second side portion arch respectively, are favorable to increasing the connection area between back connecting plate and the door inner panel to increase the joint strength between back connecting plate and the door inner panel, and set up first side portion arch into triangle-shaped, set up second side portion arch into the arch, be favorable to strengthening the structural strength of back connecting plate. Set up the second reinforcing plate in door inner panel's upper ledge department, be favorable to increasing the structural strength of door inner panel intermediate position. And a plurality of upper reinforcing ribs are arranged on the upper part of the second reinforcing plate, so that the structural strength of the second reinforcing plate is improved.

In addition, the upper reinforcing part is arranged into an upper protrusion and an upper groove, so that design and processing are facilitated. And the second reinforcing plate is provided with upper lightening holes, so that the strength of the second reinforcing plate structure is ensured, and the weight is reduced. The additional strengthening is still including locating the third reinforcing plate on the back frame, is favorable to strengthening the intensity of the weak position in the middle of the door back frame. Set up fourth reinforcing plate and fifth reinforcing plate on the frame in the front, be favorable to increasing the structural strength of frame before the door, be equipped with the arch on the fourth reinforcing plate simultaneously, can strengthen the structural strength of fourth reinforcing plate self, and be equipped with the arch opening on the fifth reinforcing plate, can guarantee the structural strength of fifth reinforcing plate.

Another object of the present invention is to provide a vehicle, wherein the door inner panel outside of the vehicle is provided with the above door reinforcing structure.

The utility model discloses a vehicle is the same with aforementioned door additional strengthening compares in prior art's beneficial effect, no longer gives unnecessary details here.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic overall structure diagram of a vehicle door reinforcing structure according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a vehicle door inner panel according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first reinforcing plate according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a second reinforcing plate according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a third reinforcing plate according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a fourth reinforcing plate according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a fifth reinforcing plate according to an embodiment of the present invention.

Description of reference numerals:

1. a door inner panel; 101. a front frame; 102. a rear frame; 103. putting the frame on; 104. a lower frame;

2. a first reinforcing plate; 201. a plate main body; 202. a front connection plate; 2021. a front reinforcing rib; 203. a rear connecting plate; 2031. a first side projection; 2032. a second side projection;

3. a second reinforcing plate; 301. a lower protrusion; 302. an upper reinforcing portion; 3021. a first upper projection; 3022. a second upper projection; 3023. an upper groove; 303. an upper lightening hole; 304. a lower lightening hole; 305. the rear end is convex; 306. a cavity;

4. a third reinforcing plate; 401. a door lock mounting hole;

5. a fourth reinforcing plate; 501. a first protrusion; 502. a second protrusion;

6. the fifth strengthening board; 601. a first opening; 602. a second opening.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The present embodiment relates to a vehicle door reinforcing structure, as shown in fig. 1, which is provided on the outer side of a vehicle door inner panel 1, and includes a first reinforcing plate 2, wherein the first reinforcing plate 2 includes a plate main body 201, and a front connecting plate 202 and a rear connecting plate 203 which are respectively disposed at the end portions of the plate main body 201.

In addition, the front attachment plate 202 is configured to be attached to an upper portion of the front frame 101 of the door inner panel 1, and the rear attachment plate 203 is configured to be attached to a connection portion of the rear frame 102 and the lower frame 104 of the door inner panel 1. The front attachment plate 202 is provided with a front bead 2021, and the front bead 2021 is formed by partially projecting the front attachment plate 202 toward the side facing away from the door inner panel 1.

The door additional strengthening of this embodiment, the board main part 201 both ends of the first reinforcing plate 2 that it set up are equipped with preceding connecting plate 202 and back connecting plate 203 respectively, preceding connecting plate 202 and back connecting plate 203 are used for connecting the preceding frame 101 upper portion of door inner panel 1 respectively and the connection position of back frame 102 and lower frame 104, be favorable to whole enhancement door inner panel 1's structural strength, set up board main part 201 into M shape simultaneously, utilize the two arch characteristics of M type structure, be favorable to improving the structural strength of board main part 201 self, be favorable to improving the holistic structural strength of door simultaneously.

Based on the above design concept, an exemplary structure of the vehicle door reinforcing structure of the embodiment is as shown in fig. 1 and fig. 2, the first reinforcing plate 2 is obliquely arranged on the vehicle door inner panel 1 in a form of upper left, upper right and lower right, the left side of the plate main body 201 of the first reinforcing plate 2 is provided with the front connecting plate 202, the front connecting plate 202 is located at a position one third of the upper portion of the vehicle door front frame 101, the right side of the plate main body 201 of the first reinforcing plate 2 is provided with the rear connecting plate 203, and the rear connecting plate 203 is located at a connecting portion of the vehicle door rear frame 102 and the lower frame 104.

As a preferred embodiment, referring to fig. 3, the cross section of the plate body 201 is M-shaped, and the double-arch feature of the M-shaped structure is utilized to increase the structural strength of the plate body 201 itself and improve the structural strength of the whole vehicle door. Two front reinforcing ribs 2021 are provided on the left front lug 202, the front reinforcing ribs 2021 extend along the longitudinal direction of the plate body 201 to the left end of the front lug 202, and the front reinforcing ribs 2021 are formed in an arch shape, which is advantageous for enhancing the structural strength of the front lug 202. The number of the front reinforcing ribs 2021 is not particularly limited, and may be arranged according to actual circumstances.

In addition, as a preferred embodiment, the upper side of the rear connection plate 203 is provided with a first side protrusion 2031, the lower side of the rear connection plate 203 is provided with a second side protrusion 2032, and each of the first side protrusion 2031 and the second side protrusion 2032 is formed by extending outward from the edge of the rear connection plate 203. Preferably, as shown in fig. 1 and 3, the first side protrusion 2031 is triangularly disposed on the upper side of the rear link plate 203, and the second side protrusion 2032 is arcuately disposed on the lower side of the rear link plate 203, so that the connection area between the rear link plate 203 and the door rear frame 102 and the lower frame 104 can be increased, and the connection strength can be increased. Of course, the shape of the first side protrusion 2031 and the second side protrusion 2032 is not limited to a triangle or an arch, and may be other shapes, and is not limited in particular.

In addition, referring to fig. 1 and 4, the door reinforcing structure of the present embodiment further includes a second reinforcing plate 3 provided at the upper frame 103 of the door inner panel 1, and a cavity 306 extending in the vehicle length direction is formed between the second reinforcing plate 3 and the door inner panel 1 for increasing the connection strength of the second reinforcing plate 3 and the door upper frame 103. Further, in order to increase the area of the cavity 306 formed between the second reinforcement plate 3 and the door inner panel 1, a lower protrusion 301 extending downward is formed at the middle rear portion of the second reinforcement plate 3.

In order to reinforce the structural strength of the second reinforcing plate 3, as a preferred embodiment, a plurality of upper reinforcing portions 302 are provided on the upper portion of the second reinforcing plate 3, and the plurality of upper reinforcing portions 302 are sequentially arranged at intervals along the longitudinal direction of the vehicle. And as a preferred embodiment, the upper reinforcement part 302 includes an upper protrusion and an upper recess 3023 formed on the second reinforcement plate 3.

Still referring to fig. 4, the upper portion of the second reinforcing plate 3 is provided with two upper protrusions and one upper recess 3023, the two upper protrusions including a first upper protrusion 3021 provided at the front end of the second reinforcing plate 3 and a second upper protrusion 3022 provided at the rear end of the second reinforcing plate 3. Preferably, the first upper protrusion 3021 is preferably rectangular in shape, the second upper protrusion 3022 is preferably arcuate in shape, and an arcuate upper recess 3023 is provided between the first upper protrusion 3021 and the second upper protrusion 3022. The lower protrusion 301 is formed by extending the arch protrusion downwards, so that the area of the cavity 306 can be increased, and the structural strength of the second reinforcing plate 3 can be improved.

In addition, it is also possible to provide only the upper protrusion on the upper portion of the second reinforcing plate 3 or only the upper groove 3023 on the second reinforcing plate 3 to reinforce the structural strength of the second reinforcing plate 3, which can be set according to the actual situation.

In addition, as a preferred embodiment, a plurality of rear end protrusions 305 are provided at the rear portion of the second reinforcing plate 3, and the plurality of rear end protrusions 305 are arranged at intervals along the vehicle height square, so as to increase the connecting strength between the rear portion of the second reinforcing plate 3 and the door rear frame 102. Referring to fig. 4, the rear-end projection 305 is formed by extending the rear edge of the second reinforcement plate 3 outward, and can increase the welding area of the second reinforcement plate 3 and increase the strength of the connection between the second reinforcement plate 3 and the rear frame 102 of the door inner panel 1.

In addition, the weight of the second reinforcing plate 3 is reduced while the structural strength of the second reinforcing plate 3 itself is ensured. In a preferred embodiment, the second reinforcing member is provided with an upper lightening hole 303 located at an upper portion of the second reinforcing plate 3 and a lower lightening hole 304 located at the lower protrusion 301. And the upper lightening holes 303 and the lower lightening holes 304 are in one of a triangular shape, a rectangular shape and an oval shape. Specifically, referring to fig. 4, the upper lightening holes 303 are provided in a rectangular shape, and two rectangular upper lightening holes 303 are provided in the arched upper recess 3023. And a triangular lower lightening hole 304 and an elliptical lower lightening hole 304 are respectively arranged on the arched lower bulge 3021 to lighten the weight of the arched lower bulge 301. Of course, in the present embodiment, the shapes of the upper lightening holes 303 and the lower lightening holes 304 are not particularly limited, and may be set according to the specific shapes.

In this embodiment, in order to enhance the structural strength of the position near the middle door lock of the door rear frame 102, the reinforcing structure further includes a third reinforcing plate 4 disposed in the middle of the rear frame 102, and referring to fig. 1 and 5, a through hole is formed in the third reinforcing plate 4, and the through hole is disposed corresponding to the door lock mounting hole 401 on the door inner panel 1. In this embodiment, the third reinforcing plate 4 has a length ranging from 132mm to 142mm, a width ranging from 76mm to 86mm, and a thickness ranging from 0.7mm to 1.7mm. Preferably, the third reinforcing plate 4 has a length of 137mm, a width of 81mm and a thickness of 1.2mm. Of course, the design dimension of the third reinforcing plate 4 may be other suitable values, and is not limited in detail.

In addition, the reinforcing structure further comprises a fourth reinforcing plate 5 arranged on the front frame 101, the front connecting plate 202 is lapped on the fourth reinforcing plate 5, a first bulge 501 is arranged at the front part of the fourth reinforcing plate 5, and the first bulge 501 is formed by extending the front edge of the fourth reinforcing plate 5 outwards. Meanwhile, the rear portion of the fourth reinforcing plate 5 is provided with a second projection 502, and the second projection 502 is formed by extending the rear edge of the fourth reinforcing plate 5 outward.

As shown in fig. 1 and 6 in particular, the fourth reinforcing plate 5 is integrally disposed at a position above the inner half of the front door frame 101, and three first protrusions 501 extend outwards from the front side of the fourth reinforcing plate 5, and the aforementioned front connecting plate 202 is overlapped on the outer sides of the first protrusions 501, so as to connect the front connecting plate 202 and the fourth reinforcing plate 5. Meanwhile, the two second protrusions 502 are arranged at the rear part of the fourth reinforcing plate 5, which is beneficial to increasing the connecting area between the fourth reinforcing plate 5 and the vehicle door inner plate 1.

Wherein, three first arch 501 and two second arch 502 all arrange along vehicle height direction interval to, first arch 501 and second arch 502 set up to the arch, when guaranteeing fourth reinforcing plate 5 structural strength, can reduce fourth reinforcing plate 5's quality. In the present embodiment, the number of the first protrusions 501 and the second protrusions 502 is not particularly limited. In addition, in the present embodiment, the first protrusion 501 may be provided only at the front portion of the fourth reinforcing plate 5, or the second protrusion 502 may be provided only at the rear portion of the fourth reinforcing plate 5, which may be provided according to actual situations.

In the present embodiment, the fourth reinforcing plate 5 has a length ranging from 153mm to 163mm, a width ranging from 85mm to 95mm, and a thickness ranging from 0.5mm to 1.5mm. Preferably, the fourth reinforcing plate 5 has a length of 158mm, a width of 90mm and a thickness of 1.0mm. Of course, the design size of the fourth reinforcing plate 5 may be other suitable values, and is not limited in particular.

In addition, the reinforcing structure further comprises a fifth reinforcing plate 6 arranged on the front frame 101, and the fourth reinforcing plate 5 and the fifth reinforcing plate 6 are arranged at intervals up and down, so that the structural strength of the front frame 101 of the vehicle door inner panel 1 can be further improved. In this regard, as a preferred embodiment, referring to fig. 1 and 7, the fifth reinforcing plate 6 is disposed at a quarter of the front frame 101, and the fifth reinforcing plate 6 is disposed lower than the fourth reinforcing plate 5, and a first opening 601 is provided at the front of the fifth reinforcing plate 6, and a second opening 602 is provided at the rear of the fifth reinforcing plate 6. Specifically, the first opening 601 is provided at the front middle position of the fifth reinforcing plate 6, and the second opening 602 is provided at the rear middle position of the fifth reinforcing plate 6, so that the structural strength of the fifth reinforcing plate 6 can be ensured, and the weight of the fifth reinforcing plate 6 can be reduced.

In this embodiment, the length of the fifth reinforcing plate 6 is 296mm to 306mm, the width thereof is 148mm to 158mm, and the thickness thereof is 0.5mm to 1.5mm. Preferably, the fifth reinforcing plate 6 has a length of 301mm, a width of 153mm and a thickness of 1.0mm. Of course, the design size of the fifth reinforcing plate 6 may be other suitable values, and is not limited in detail.

In the present embodiment, it is not limited to that only the first opening 601 and the second opening 602 are provided on the fifth reinforcing plate 6, and the first opening 601 may be provided only on the fifth reinforcing plate 6, or the second opening 602 may be provided only on the fifth reinforcing plate 6, which is not further limited herein.

The door additional strengthening of this embodiment is provided with five reinforcing plates simultaneously on door inner panel 1, can strengthen the structural strength of door inner panel 1 respectively from four directions about the front and back, is favorable to reducing the sensitivity of door frame vibration response.

The present embodiment also relates to a vehicle having the door reinforcing structure described above provided on the outer side of the door inner panel 1.

The vehicle of this embodiment is provided with foretell door additional strengthening, can improve the structural strength of door inner panel 1 to at the vehicle in-process of traveling, reduce the resonance of door inner panel 1, and then reduce the noise of transmitting in to the driver's cabin, improve driver and crew's the experience of taking.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a door additional strengthening locates the outside of door inner panel (1), its characterized in that, additional strengthening includes:

the first reinforcing plate (2) comprises a plate main body (201), and a front connecting plate (202) and a rear connecting plate (203) which are respectively arranged at the end parts of the plate main body (201), wherein the front connecting plate (202) is used for being connected to the upper part of a front frame (101) of the door inner plate (1), and the rear connecting plate (203) is used for being connected to the connecting part of a rear frame (102) and a lower frame (104) of the door inner plate (1);

the front connecting plate (202) is provided with a front reinforcing rib (2021), and the front reinforcing rib (2021) is formed by partially protruding one side of the front connecting plate (202) back to the vehicle door inner plate (1).

2. The vehicle door reinforcing structure according to claim 1, wherein:

the cross section of the plate main body (201) is M-shaped;

a first side protrusion (2031) is arranged on the upper side of the rear connecting plate (203), a second side protrusion (2032) is arranged on the lower side of the rear connecting plate (203), and the first side protrusion (2031) and the second side protrusion (2032) are formed by extending outwards from the edge of the rear connecting plate (203);

the first side protrusion (2031) is triangular, and the second side protrusion (2032) is arched.

3. The vehicle door reinforcing structure according to claim 1, wherein:

the reinforcing structure further comprises a second reinforcing plate (3) arranged at an upper frame (103) of the vehicle door inner plate (1), and a cavity (306) extending along the length direction of a vehicle is formed between the second reinforcing plate (3) and the vehicle door inner plate (1);

the middle rear part of the second reinforcing plate (3) is provided with a lower bulge (301) extending downwards.

4. The vehicle door reinforcing structure according to claim 3, wherein:

a plurality of upper reinforcing parts (302) are arranged at the upper part of the second reinforcing plate (3), and the upper reinforcing parts (302) are sequentially arranged at intervals along the length direction of the vehicle;

the upper reinforcement part (302) includes an upper protrusion or an upper groove (3023) formed on the second reinforcement plate (3).

5. The vehicle door reinforcing structure according to claim 4, wherein:

an upper lightening hole (303) positioned at the upper part of the second reinforcing plate (3) and a lower lightening hole (304) positioned on the lower bulge (301) are formed in the second reinforcing plate (3), and the shapes of the upper lightening hole (303) and the lower lightening hole (304) are all one of triangle, rectangle and ellipse;

the rear portion of the second reinforcing plate (3) is provided with a plurality of rear end protrusions (305), the rear end protrusions (305) are arranged at intervals in the height direction of the vehicle, and the rear end protrusions (305) are formed by extending the rear edge of the second reinforcing plate (3) outwards.

6. The vehicle door reinforcing structure according to claim 5, wherein:

the upper portion of the second reinforcing plate (3) is provided with two upper portion protrusions and an upper portion groove (3023), the two upper portion protrusions comprise a first upper portion protrusion (3021) arranged at the front end of the second reinforcing plate (3) and a second upper portion protrusion (3022) arranged at the rear end of the second reinforcing plate (3), and the upper portion lightening hole (303) and the upper portion groove (3023) are arranged between the first upper portion protrusion (3021) and the second upper portion protrusion (3022).

7. The vehicle door reinforcing structure according to claim 1, characterized in that:

the reinforcing structure further comprises a third reinforcing plate (4) arranged in the middle of the rear frame (102), a through hole is formed in the third reinforcing plate (4), and the through hole is arranged corresponding to a door lock mounting hole (401) in the vehicle door inner plate (1).

8. The vehicle door reinforcing structure according to any one of claims 1 to 7, wherein:

the reinforcing structure further comprises a fourth reinforcing plate (5) arranged on the front frame (101), and the front connecting plate (202) is lapped on the fourth reinforcing plate (5);

the front part of the fourth reinforcing plate (5) is provided with a first bulge (501), and the first bulge (501) is formed by extending the front edge of the fourth reinforcing plate (5) outwards; and/or the rear part of the fourth reinforcing plate (5) is provided with a second bulge (502), and the second bulge (502) is formed by extending the rear edge of the fourth reinforcing plate (5) outwards;

the first bulges (501) and the second bulges (502) are arranged at intervals along the height direction of the vehicle.

9. The vehicle door reinforcing structure according to claim 8, wherein:

the reinforcing structure further comprises a fifth reinforcing plate (6) arranged on the front frame (101), and the fourth reinforcing plate (5) and the fifth reinforcing plate (6) are arranged at intervals up and down;

the front part of the fifth reinforcing plate (6) is provided with a first opening (601), the shape of the first opening (601) is arched, and/or the rear part of the fifth reinforcing plate (6) is provided with a second opening (602), and the shape of the second opening (602) is arched.

10. A vehicle, characterized in that: the door inner panel (1) of the vehicle is provided on the outer side with the door reinforcing structure of any one of claims 1 to 9.