CN217435487U - Lower segment structure assembly of sectional type back door and automobile - Google Patents

Abstract

The utility model provides a hypomere structure assembly and car of sectional type back door belongs to car technical field, including back door inner panel and back door inner panel reinforcing plate down, back door inner panel has back door hinge mount position, back door hasp installation position and coupling mechanism installation position down. The lower back door inner plate reinforcing plate is fixedly connected to the rear side surface of the lower back door inner plate, extends from the back door lock catch mounting position in the middle position to the left and right directions of the vehicle body and reaches the lower back door lock catch mounting positions at the left end and the right end; the lower hinge is installed close to the lower side of the lower back door inner plate reinforcing plate, and the connecting mechanism installation positions are symmetrically arranged on the left side and the right side of the lower back door inner plate reinforcing plate. The sheet metal component that the lower back of the body door inner panel reinforcing plate of this embodiment extends as a left right direction owing to have great surface area, can promote the bulk strength of back of the body door down, arranges under the installation condition at the required multiple annex of matching, can satisfy the advantage of the durable, assembly intensity of switching, bearing demand.

Description

Lower segment structure assembly of sectional type back door and automobile

Technical Field

The utility model belongs to the technical field of the car, concretely relates to hypomere structure assembly of sectional type back door.

Background

The automobile tail gate is generally an upward-lifting type tail gate or a side-opening type tail gate, and aims to solve the problems that the tail gate is too heavy, the arrangement space of a trunk is limited and the like in larger automobile types. And the split type tail gate with the upper and lower sections is divided into an upper part and a lower part, so that the problems of overweight tail gate and limited arrangement space of the luggage case can be solved. However, in the existing split tailgate with upper and lower segments, the lower segment structure has heavy bearing weight, and a plurality of accessories such as hinges, latches, connecting mechanisms (not limited to stay bars, pull wires, and pull rods) need to be arranged, and because the lower segment structure has insufficient strength, once collision occurs, the mounting positions of the accessories of the tailgate are easily damaged, and other parts of the tailgate may be seriously affected.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a hypomere structure assembly of sectional type back door aims at solving back door lower segment structural strength inadequately, and each annex mounted position department fragile of back door that causes, and then involves the problem that other parts of automobile body produced serious influence.

In order to achieve the above object, the utility model adopts the following technical scheme: a lower section structure assembly of a sectional back door is provided, comprising:

the lower back door inner plate is provided with a lower back door hinge installation position, a back door lock catch installation position, a lower back door lock catch installation position and a connecting mechanism installation position; and

the lower back door inner plate reinforcing plate is fixedly connected to the rear side surface of the lower back door inner plate, extends from the back door lock catch mounting position in the middle position to the left and right directions of the vehicle body and reaches the lower back door lock catch mounting positions at the left end and the right end;

the lower back door hinge mounting positions are close to the lower side of the lower back door inner plate reinforcing plate, and the connecting mechanism mounting positions are symmetrically arranged on the left side and the right side of the lower back door inner plate reinforcing plate.

With reference to the first aspect, in one possible implementation manner, the lower back door inner plate reinforcing plate is provided with a reinforcing part extending downwards, and the reinforcing part is symmetrical to the back door lock catch mounting position and is located between the two lower back door hinge mounting positions.

With reference to the first aspect, in a possible implementation manner, the lower back door inner panel reinforcing plate is further provided with a first reinforcing rib protruding towards the outer side of the vehicle body, and the first reinforcing rib extends along the left-right direction of the vehicle body.

With reference to the first aspect, in a possible implementation manner, the lower-section structural assembly further includes a back door lock catch nut plate, and the back door lock catch nut plate corresponds to the back door lock catch installation position and is fixedly connected to the rear side surface of the lower back door inner plate reinforcing plate.

With reference to the first aspect, in a possible implementation manner, the lower-section structure assembly further includes a lower back door lock catch reinforcing plate, and the lower back door lock catch reinforcing plate corresponds to the lower back door lock catch mounting positions at the left and right ends and is lapped on the left and right ends of the rear side surface of the lower back door inner plate reinforcing plate.

With reference to the first aspect, in one possible implementation manner, a lower back door latch nut plate is fixedly connected to a front side surface of the lower back door latch reinforcing plate.

In combination with the first aspect, in one possible implementation manner, the lower back door latch catch reinforcing plate at the left end extends to the left of the vehicle body to the connecting mechanism mounting position, and the lower back door latch catch reinforcing plate at the right end extends to the right of the vehicle body to the connecting mechanism mounting position.

With reference to the first aspect, in a possible implementation manner, the lower-section structure assembly further includes a lower back door hinge reinforcing plate, the lower back door hinge reinforcing plate corresponds to the lower back door hinge mounting position, an upper end of the lower back door hinge reinforcing plate is lapped on a rear side surface of the lower back door inner plate reinforcing plate, and a lower end of the lower back door hinge reinforcing plate extends downward to the lower back door hinge mounting position.

With reference to the first aspect, in a possible implementation manner, a lower back door hinge nut plate is further provided on a rear side surface of the lower end of the lower back door hinge reinforcing plate.

The utility model provides a hypomere structure assembly of sectional type back of the body door, compared with the prior art, beneficial effect lies in: the lower back door inner plate reinforcing plate extending along the left and right directions of the lower back door inner plate is arranged, so that the strength of the lower back door inner plate can be improved, the supporting strength of functional accessories related to the lower back door can be integrally improved, the problem that the installation positions of the accessories of the back door are easy to damage can be relieved, the deformation resistance is improved due to the improvement of the integral strength, and the problem that other parts of a vehicle body are seriously influenced can be avoided; and, through the extension length of back of the body inner panel reinforcing plate down, the intensity of back of the body door hasp installation position has directly been strengthened to back of the body door inner panel reinforcing plate down, also direct promotion the intensity of the back of the body door hasp installation position at left and right sides both ends, and further can improve the peripheral connection structure installation position that relates to, the intensity of back of the body door hinge installation position down, thereby can slow down the fragile problem of each annex mounted position department of back of the body door, and the improvement of bulk strength, anti deformability has been promoted, thereby can avoid other parts of automobile body to produce the problem of serious influence.

In a second aspect, the embodiments of the present invention further provide an automobile, including the lower section structure assembly of the sectional type back door.

The utility model provides an automobile, owing to adopted this kind of lower back of the body door of strengthening, consequently, when the automobile body received the collision, can slow down the fragile problem of each annex mounted position department of back of the body door, promote whole anti deformability to can avoid other parts of automobile body to produce the problem of serious influence, arrange the installation condition matching required multiple annex under, satisfy the advantage of the durable, assembly intensity of switching, bearing demand.

Drawings

Fig. 1 is a schematic perspective view (rear view) of a lower section structure assembly of a sectional back door according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram (front view) of a lower section structural assembly of a sectional back door according to an embodiment of the present invention;

fig. 3 is an exploded schematic view of a lower section structure assembly of a sectional back door according to an embodiment of the present invention;

fig. 4 is a schematic perspective view (rear view) of a reinforcement plate of an inner panel of a back door according to an embodiment of the present invention;

fig. 5 is a schematic perspective view (front view) of a lower back door inner panel reinforcement provided in an embodiment of the present invention;

fig. 6 is an exploded schematic view of a lower back door inner plate reinforcing plate and a lower back door latch nut plate according to an embodiment of the present invention;

fig. 7 is a schematic perspective view (rear view) of a reinforcing plate of a lower back door latch according to an embodiment of the present invention;

fig. 8 is a schematic perspective view (rear view) of a reinforcing plate of a hinge of a back door according to an embodiment of the present invention;

fig. 9 is an exploded schematic view of a lower back door hinge reinforcing plate and a lower back door hinge nut plate according to an embodiment of the present invention;

fig. 10 is a schematic structural view of the lower back door latch nut plate cooperating with the latch lever of the lower back door latch according to the embodiment of the present invention;

description of the reference numerals:

1. a lower back door inner panel; 2. a back door latch nut plate; 3. a lower back door inner panel reinforcing plate; 31. a first reinforcing rib; 32. a reinforcing portion; 33. a second reinforcing rib; 4. a lower back door lock catch reinforcing plate; 5. a lower back door lock catch nut plate; 51. a square hole; 6. a lower back door hinge stiffener; 61. a third reinforcing rib; 7. a lower back door hinge nut plate; 8. a lower back door latch mounting location; 9. a connecting mechanism mounting position; 10. a lower back door hinge mounting position; 11. a back door lock catch mounting position; 12. the lock catch lever.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that, in the description of the present invention, terms indicating orientation or positional relationship such as "front", "rear", "left", "right", "upper", "lower", etc. appear in correspondence with the front "," rear "," left "," right "," upper "," lower "orientation of the automobile.

Referring to fig. 1 to 9, a lower section assembly of a sectional back door according to the present invention will be described. The lower section structure assembly of the sectional type back door comprises a lower back door inner plate 1 and a lower back door inner plate reinforcing plate 3, wherein the lower back door inner plate 1 is provided with a lower back door hinge installation position 10 for installing a lower hinge, a back door lock catch installation position 11 for installing a back door lock catch, a lower back door lock catch installation position 8 for installing a lower back door lock catch and a connecting mechanism installation position 9 for installing a connecting mechanism.

Referring to fig. 1 to 3, the lower back door inner plate reinforcing plate 3 is fixedly connected to the rear side surface of the lower back door inner plate 1, and extends from the back door lock catch mounting position 11 at the middle position to the left and right direction of the vehicle body (the left and right direction is an arrow pointing to the left and right direction in fig. 1) to the lower back door lock catch mounting positions 8 at the left and right ends; wherein, the lower back door hinge mounting positions 10 are close to the lower side of the lower back door inner plate reinforcing plate 3, and the connecting mechanism mounting positions 9 are symmetrically arranged at the left side and the right side of the lower back door inner plate reinforcing plate 3. The rear side of the lower back door inner plate refers to the side of the lower back door inner plate facing the rear of the vehicle.

Compared with the prior art, the sectional type back door lower section structure assembly provided by the embodiment has the advantages that the strength of the lower back door inner plate 1 can be improved by arranging the lower back door inner plate reinforcing plate 3 extending along the left and right directions of the lower back door inner plate 1, so that the supporting strength of functional accessories related to the lower back door is integrally improved, the problem that the mounting positions of the accessories of the back door are easily damaged can be relieved, the integral strength is improved, the deformation resistance is improved, and the problem that other parts of a vehicle body are seriously influenced can be avoided; and, through the extension length of back door inner panel reinforcing plate 3 down, back door hasp installation position 11's intensity has directly been strengthened to back door inner panel reinforcing plate 3 down, also direct promotion the intensity of the back door hasp installation position 8 of controlling both ends, and further can improve the peripheral connection structure installation position that relates to, the intensity of back door hinge installation position 10 down, thereby can slow down the fragile problem of each annex mounted position department of back door, and the improvement of bulk strength, anti-deformation ability has been promoted, thereby can avoid other parts of automobile body to produce the problem of serious influence.

For a back door with split upper and lower sections, since the back door (i.e. the lower section structure) needs to bear the weight of the upper section structure, it also needs to bear the impact force to the back door when the back door is closed downwards, and the back door itself needs to be installed with many accessories, such as but not limited to the accessories listed herein: a annexs such as vaulting pole, act as go-between for back door hasp for going up back of the body door and back of the body door locking down, be used for back of the body door to close the lower back of the body door hasp of back locking down, be used for back of the body door down to open the back of the body door hinge down of pin joint when closing, and attach to back of the body door down and install on the annex such as vaulting pole, act as go-between, all need back of the body door down to have higher intensity support. This embodiment is through can be directly to back door hasp installation position 11, the lower back of the body door inner panel reinforcing plate 3 that 8 direct reinforcements in back door hasp installation position directly promote the intensity in each hasp installation position, and such laying also can make 3 ripples of back door inner panel reinforcing plate down reach or be close to back of the body door hinge installation position 10 and coupling mechanism installation position 9 down to promote the intensity in each installation position, promote the ability that each installation position anti impact deformation damaged.

Moreover, due to the improvement of the strength of each installation position, the problems that the upper back door and the lower back door are in gaps and misplaced, cannot be locked and locked, are unsmooth in opening and closing and are caused by the accumulated deformation of each installation position or the lower back door in long-term use can be avoided.

The lower section structure assembly provided by the embodiment can provide the arrangement and installation requirements of accessories such as a lower back door hinge, lower back door two-side connecting mechanisms (not limited to a stay bar, a stay wire, a pull rod and the like), lower back door two-side lock catches, a back door lock catch and the like, and can meet the performance requirements of the installed accessories.

It should be noted that each mounting position mentioned in this embodiment is a commonly-used mounting position for functional accessories of a general vehicle type, a specific position is also set conventionally and reasonably, and a specific position relative relationship of each mounting position is described as follows: the back door lock catch mounting position 11 is used for locking the upper back door and the lower back door, is arranged in the middle of the left and right directions of the lower back door inner plate 1 and leans against the upper end of the lower back door inner plate 1; the lower back door lock catch mounting positions 8 used for locking the lower back door are arranged at the left end and the right end of the lower back door lock catch mounting positions, and therefore the two lower back door lock catch mounting positions are symmetrically arranged at positions close to the two ends in the left-right direction of the lower back door inner plate 1; the lower back door hinge is used as a pivot for opening and closing the lower back door, the lower back door hinge mounting positions 10 are positioned at the lower part of the lower back door inner plate 1, are symmetrically arranged along the central line vertical to the left and right direction of the vehicle body, and are positioned below the back door lock catch mounting position 11 and the lower back door lock catch mounting position 8, wherein the left and right lower back door hinge mounting positions 10 are respectively positioned between the back door lock catch and the lower back door lock catch at the corresponding side; and is arranged outside the lower back door lock catch mounting position 8. The back door lock catch, the lower back door lock catch and the connecting mechanism mounting position 9 are located in the upper area of the lower back door inner plate 1, and the lower back door hinge mounting position 10 is located in the lower area of the lower back door inner plate 1.

The lower back door inner plate reinforcing plate 3 of the embodiment is used as a sheet metal part extending in the left-right direction, and has a large surface area, so that the overall strength of the lower back door can be improved, and the deformation resistance of each mounting position is improved; under the condition that multiple accessories are arranged and mounted as required by matching, the advantages of durability in opening and closing, assembly strength, bearing requirements and convenience in mounting and debugging are met.

The back of the body door inner panel reinforcing plate 3 is fixed with back of the body door inner panel 1 down, can adopt spiro union, welding or spiro union and welding complex mode to connect the fastening together, and back of the body door inner panel reinforcing plate 3 is laminated on back of the body door inner panel 1 down along with the shape simultaneously down, promotes the effect of strengthening.

In some embodiments, as shown in fig. 4-6, the lower back door inner panel reinforcement panel 3 has a downwardly extending reinforcement 32, the reinforcement 32 being symmetrical to the back door latch mounting location 11 and located between the two back door hinge mounting locations. Through the lower downwardly extending of the lower back door inner plate reinforcing plate 3 and downwardly extending to the vicinity of the lower back door hinge mounting position 10, the supporting strength of the back door hinge mounting position is improved.

Specifically, the reinforcing portions 32 extending downward are provided symmetrically on both left and right sides of the back door latch installation site 11.

In some embodiments, as shown in fig. 4 to 6, the first reinforcing rib 31 protruding outward of the vehicle body is further provided on the inner back door panel 3, and the first reinforcing rib 31 extends in the left-right direction of the vehicle body. Through the first strengthening rib 31 that sets up, intensity of back of the body door inner panel reinforcing plate 3 under can further promotion, and then promote the support intensity of back of the body door inner panel 1 down, promote the whole ability of anti deformation damage of back of the body door down.

In order to increase the strength of the reinforcing portion 32, as shown in fig. 4 to 6, a second rib 33 extending in the vertical direction is further provided along the reinforcing portion 32. The first reinforcing rib 31 and the second reinforcing rib 33 have good effect on improving the strength of the lower back door inner panel reinforcing plate 3.

In some embodiments, as shown in fig. 1 to 3 and 6, the lower structural assembly further includes a back door lock-catch nut plate 2, and the back door lock-catch nut plate 2 is fixedly connected to the middle position of the rear side of the lower back door inner plate reinforcing plate 3 corresponding to the back door lock-catch mounting position 11. The back door lock catch nut plate 2 is arranged on the lower back door inner plate reinforcing plate 3, so that the back door lock catch can be supported by three layers of sheet metal parts when the back door lock catch is installed conveniently, and the supporting strength of the back door lock catch is greatly improved. Wherein, be equipped with the bolt hole that runs through back door inner panel 1, back door inner panel reinforcing plate 3 and back door hasp nut plate 2 down in this position to the installation of back door hasp.

For the lower back door latch installation position 8, as shown in fig. 1 to fig. 3 and fig. 7, the lower section structure assembly provided by this embodiment further includes a lower back door latch reinforcing plate 4, and the lower back door latch installation positions 8 at the left and right ends of the lower back door latch reinforcing plate 4 are connected to the left and right ends of the rear side surface of the lower back door inner plate reinforcing plate 3. Because lower back of the body knocker installation position 8 has the breach of dodging of associated part, the structure is weak, and is fixed through the overlap joint of lower back of the body knocker reinforcing plate 4 and lower back of the body door inner panel reinforcing plate 3, forms the bearing structure of multilayer panel beating, has promoted the support strength of lower back of the body knocker.

As a preferred embodiment, a lower back door latch nut plate 5 is fixedly connected to a front side surface of the lower back door latch reinforcement plate 4 as shown in fig. 1 to 3 and 6. The lower back door lock buckle nut plate 5 is convenient for installation of the lower back door lock buckle, and meanwhile, the lower back door lock buckle can be supported by three layers of sheet metal parts, so that the supporting strength of the lower back door lock buckle is greatly improved. Wherein, be equipped with the bolt hole that runs through back of the body lock reinforcing plate 4, back of the body inner panel reinforcing plate 3 and back of the body lock buckle nut plate 5 down in this position to the installation of back of the body lock buckle down.

The lower back door lock catch nut plate 5 is in lap joint with the lower back door inner plate reinforcing plate 3 on one hand, and is attached and fixed with the lower back door inner plate 1 along with the shape on the other hand, and connection modes such as bolts, welding and the like can be adopted.

Optionally, as shown in fig. 6, the lower back door latch nut plate 5 is a bent plate, and has a first plate attached to the lower back door inner plate reinforcing plate 3 and a second plate perpendicular to the first plate, wherein the second plate extends toward the rear of the vehicle body, and a square hole 51 is adopted for mounting the lower back door latch, wherein the square hole 51 is disposed on the second plate, and a certain adjustment gap L is reserved between the square hole 51 and the latch rod 12 of the lower back door latch penetrating through the square hole 51, and the gap L is optionally 2-3mm (as shown in fig. 10), i.e., a perpendicular distance from an outer wall of the latch rod 12 to an inner wall of the square hole, so that the lower back door latch has adjustment gaps in the front-rear direction and the up-down direction of the vehicle body, so as to be conveniently mounted at the end of the vehicle body and improve the delicate perception of the rear region of the vehicle body.

In order to influence the four corners on the locking rod, the four corners of the square hole are rounded.

As a preferable embodiment, as shown in fig. 1, the lower back door lock catch reinforcing plate 4 at the left end extends to the link mounting position 9 toward the left side of the vehicle body, and the lower back door lock catch reinforcing plate 4 at the right end extends to the link mounting position 9 toward the right side of the vehicle body. That is, the lower back door latch reinforcing plate 4 also serves as a reinforcing structure for the connecting mechanism mounting position 9, so that the connecting mechanism mounting position 9 constitutes a double-layer sheet metal support. Similarly, the bolt holes penetrating through the lower back door lock catch reinforcing plate 4 and the lower back door inner plate reinforcing plate 3 are arranged at the position, so that the connecting mechanism is convenient to mount.

In some embodiments, as shown in fig. 1 to 3, 8 and 9, the lower structural assembly further includes a lower back door hinge reinforcing plate 6, the lower back door hinge reinforcing plate 6 corresponds to the lower back door hinge mounting position 10, the upper end thereof is overlapped on the rear side of the lower back door inner plate reinforcing plate 3, and the lower end thereof extends downward to the lower back door hinge mounting position 10. So, through the direct overlap joint of back of the body door hinge reinforcing plate 6 and back of the body door inner panel reinforcing plate 3 down, form the relevance, when guaranteeing back of the body door hinge installation position 10 intensity down, promoted the bulk strength of back of the body door inner panel 1 down.

Alternatively, as shown in fig. 8, the lower back door hinge reinforcing plate 6 is provided with a third reinforcing rib 61 extending in the vertical direction.

As a preferred embodiment, as shown in fig. 1 to 3 and 9, a lower back door hinge nut plate 7 is further provided on the lower end rear side surface of the lower back door hinge reinforcing plate 6. The lower back door hinge nut plate 7 is convenient for installation of the lower back door hinge, and meanwhile, the lower back door hinge can be supported by three layers of sheet metal parts, so that the supporting strength of the lower back door hinge is greatly improved. Bolt holes penetrating through the lower back door hinge nut plate 7, the lower back door hinge reinforcing plate 6 and the lower back door inner plate 1 are formed in the position, so that the lower back door hinge can be conveniently installed.

In this embodiment, back of the body door hinge reinforcing plate 6 down, back of the body door hasp reinforcing plate 4 all is associated with the direct overlap joint of back of the body door inner panel reinforcing plate 3 down, for each installation position provides multilayer sheet metal structure, the problem of back of the body door inner panel reinforcing plate 3 if the overall dimension of preparation is too big and the cost of manufacture is high has been avoided, through the cooperation of the reinforcing plate of holistic back of the body door inner panel reinforcing plate 3 and local back of the body door hinge and back of the body door hasp position down, the holistic intensity of back of the body door inner panel 1 down has both been promoted, the intensity of each annex installation position has also concurrently, thereby can guarantee that each annex satisfies the assembly performance requirement, and then guarantee the assembly performance requirement of back of the body door down.

In this embodiment, as shown in fig. 4 to 9, a flange (not labeled in the figures) may be further disposed along the edge of each reinforcing plate and each nut plate to enhance the strength of each component, so as to enhance the strength of each component, thereby enhancing the overall strength of the back door.

Therefore, to the lower back door inner panel 1 that annex such as back door hinge, coupling mechanism, hasp provided the mounting point down simultaneously, promote the intensity of back door inner panel 1 down through the cooperation of each reinforcing plate, can reach following effect:

(1) the lower back door inner plate 1 can meet the requirements of opening and closing durability and assembly strength, and no problems of structural failure, welding spot cracking and the like exist in thirty-thousand durability experiments.

(2) After the lower back door is opened for a certain angle and is laid flat, the requirement that the metal plate bearing with certain weight (200 KG/two adults) is not deformed can be met.

(3) Lower back of the body lock detains reinforcing plate 4, back of the body hinge reinforcing plate 6, back of the body lock detains nut plate 5 and 3 split finished pieces of back of the body inner panel reinforcing plate down, prevents that a plurality of faces of finished piece that merge from leading to the debugging difficulty with the laminating of back of the body inner panel reinforcing plate 3 down from appearing, and then influences the problem of annex installation.

(4) The lower back door lock catch nut plate 5 is a square through hole, a certain gap (set to be 3mm) is reserved between the lower back door lock catch and the lower back door lock catch, the lower back door lock catch can be conveniently debugged and installed on the vehicle body in the vertical direction, the front-back direction and the vehicle body end, and the regional delicate perception of the rear portion of the vehicle body is improved.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Based on the same inventive concept, the embodiment of the application also provides an automobile which comprises the lower section structure assembly of the segmented back door.

The utility model provides an automobile, owing to adopted this kind of lower back of the body door of strengthening, consequently, when the automobile body received the collision, can slow down the fragile problem of each annex mounted position department of back of the body door, promoted whole anti deformability to can avoid other parts of automobile body to produce the problem of serious influence.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims (10)

1. The utility model provides a lower section structure assembly of sectional type back door which characterized in that includes:

the lower back door inner plate (1) is provided with a lower back door hinge mounting position (10), a back door lock catch mounting position (11), a lower back door lock catch mounting position (8) and a connecting mechanism mounting position (9); and

the lower back door inner plate reinforcing plate (3) is fixedly connected to the rear side surface of the lower back door inner plate (1), extends from the back door lock catch mounting position (11) in the middle position to the left and right directions of the vehicle body and extends to the lower back door lock catch mounting positions (8) at the left end and the right end;

the lower back door hinge mounting positions (10) are close to the lower side of the lower back door inner plate reinforcing plate (3), and the connecting mechanism mounting positions (9) are symmetrically arranged on the left side and the right side of the lower back door inner plate reinforcing plate (3).

2. The lower structural assembly of a segmented tailgate according to claim 1, characterized in that the lower tailgate inner panel reinforcement plate (3) has a downwardly extending reinforcement (32), the reinforcement (32) being symmetrical to the tailgate latch mounting location (11) and located between the two lower tailgate hinge mounting locations (10).

3. The lower structural assembly of the sectional type back door according to claim 1, wherein the lower back door inner panel reinforcement plate (3) is further provided with a first reinforcing rib (31) protruding toward the outside of the vehicle body, and the first reinforcing rib (31) extends in the left-right direction of the vehicle body.

4. The lower structural assembly of the sectional back door as claimed in claim 1, further comprising a back door latch nut plate (2), wherein the back door latch nut plate (2) is fixedly connected to a rear side surface of the back door inner plate reinforcement plate (3) corresponding to the back door latch installation site (11).

5. The lower structural assembly of the sectional back door according to claim 1, further comprising a lower back door latch reinforcing plate (4), wherein the lower back door latch reinforcing plate (4) is connected to the left and right ends of the rear side of the lower back door inner plate reinforcing plate (3) corresponding to the lower back door latch mounting locations (8) at the left and right ends.

6. The lower structural assembly of the sectional back door according to claim 5, wherein a lower back door latch nut plate (5) is fixedly connected to the front side surface of the lower back door latch reinforcement plate (4).

7. The lower structural assembly of the sectional type back door according to claim 5, wherein the lower back door latch reinforcement plate (4) at the left end extends to the attachment mechanism mounting position (9) toward the left of the vehicle body, and the lower back door latch reinforcement plate (4) at the right end extends to the attachment mechanism mounting position (9) toward the right of the vehicle body.

8. The segmented tailgate lower structural assembly, according to claim 1, characterized in that it further comprises a lower tailgate hinge reinforcement plate (6), the lower tailgate hinge reinforcement plate (6) corresponding to the lower tailgate hinge mounting location (10), overlapping at its upper end on the rear side of the lower tailgate inner panel reinforcement plate (3), extending at its lower end down to the lower tailgate hinge mounting location (10).

9. The lower structural assembly of the sectional back door according to claim 8, wherein a lower back door hinge nut plate (7) is further provided on the lower end rear side of the lower back door hinge reinforcing plate (6).

10. An automobile comprising a lower segment structural assembly of a segmented tailgate according to any of claims 1 to 9.

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