Rear side wall inner plate, door ring structure and vehicle

Abstract

The utility model relates to the technical field of vehicle parts, and particularly discloses a rear side wall inner plate, a door ring structure and a vehicle, the rear side wall inner plate comprises a C column part, a D column part, a first connecting part, a second connecting part and a third connecting part which are integrally formed, the C column part and the D column part are arranged at an interval, and the first connecting part and the second connecting part are arranged at an interval; the two ends of the first connecting part are connected with one end of the C-column part and one end of the D-column part correspondingly, the two ends of the second connecting part are connected with the other end of the C-column part and the other end of the D-column part correspondingly, and the C-column part, the D-column part, the first connecting part and the second connecting part define a mounting space for mounting the quarter window. The third connecting part is arranged at the position, away from the installation space, of the connecting area of the first connecting part and the D column part, and the third connecting part extends towards the inner sides of the first connecting part and the D column part. According to the rear side wall inner plate, the C column part, the D column part, the first connecting part, the second connecting part and the third connecting part are integrally formed, so that the design and production efficiency of a vehicle is improved, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the field of vehicle component technology, specifically to a rear side panel inner panel, door ring structure, and vehicle. Background Technology

[0002] In existing automotive body manufacturing technology, the structure of the triangular window area is typically assembled from multiple independent sheet metal parts (including the C-pillar, window frame reinforcement plate, inner / outer water jet mounting bracket, side panel connecting plate, etc.) through spot welding, bolting, or riveting. This traditional process has significant drawbacks: First, each component requires a separately developed stamping die, with a die sharing rate of less than 35%, resulting in a 15%-20% decrease in material utilization per part; second, the assembly process involves multiple positioning, clamping, and connection steps, consuming an average of 3.2 man-hours per vehicle's triangular window area. These factors collectively result in poor design flexibility, low production efficiency, and high manufacturing costs for vehicles. Utility Model Content

[0003] In view of the above, it is necessary to propose a rear side panel inner panel, door ring structure and vehicle to improve vehicle design and production efficiency and reduce costs.

[0004] This application provides a rear side panel including an integrally formed C-pillar, D-pillar, first connecting portion, second connecting portion, and third connecting portion. The C-pillar and D-pillar are spaced apart, and the first connecting portion and second connecting portion are spaced apart. The two ends of the first connecting portion are respectively connected to one end of the C-pillar and one end of the D-pillar, and the two ends of the second connecting portion are respectively connected to the other ends of the C-pillar and the other end of the D-pillar. The C-pillar, D-pillar, first connecting portion, and second connecting portion enclose an installation space for installing a triangular window. The third connecting portion is located at a position away from the installation space in the connection area of ​​the first connecting portion and D-pillar, and the third connecting portion extends toward the inside of the first connecting portion and D-pillar.

[0005] In some embodiments, the third connecting portion has a first protruding edge on the side near the C-pillar, and the first connecting portion has a second protruding edge connected to the first protruding edge on the side away from the mounting space; and / or, the third connecting portion has a third protruding edge on the side away from the C-pillar, and the D-pillar has a fourth protruding edge connected to the third protruding edge on the side away from the mounting space.

[0006] In some embodiments, the C-pillar, the D-pillar, the first connecting portion, the second connecting portion, and the third connecting portion are integrally formed by aluminum casting; and / or, a positioning groove is provided on the outer side wall of the end of the third connecting portion away from the first connecting portion and the D-pillar.

[0007] In some embodiments, the second connecting portion includes a front section and a rear section connected to each other, the angle between the extending direction of the front section and the extending direction of the rear section is an obtuse angle, the end of the front section away from the rear section is connected to the C-pillar, and the end of the rear section away from the front section is connected to the D-pillar.

[0008] In some embodiments, the inner sidewall of the rear section is provided with a mounting groove, the bottom of the mounting groove has a first mating surface, the mounting groove is provided with a mounting boss, and the sidewall of the mounting boss has a second mating surface.

[0009] In some embodiments, the inner wall of the installation space is provided with a stop flange extending toward the center of the installation space, and the stop flange is connected to the outer walls of the C-pillar, the D-pillar, the first connecting portion and the second connecting portion.

[0010] In some embodiments, the end of the first connecting portion away from the D-pillar extends in a direction away from the D-pillar and forms an overlapping portion, wherein the outer side wall of the overlapping portion is provided with an overlapping boss.

[0011] In some embodiments, the outer wall of the C-pillar is provided with a first reinforcing rib; and / or, the outer wall of the D-pillar is provided with a second reinforcing rib; and / or, the inner wall of the D-pillar is provided with a honeycomb-shaped reinforcing rib; and / or, the outer wall of the first connecting portion is provided with a third reinforcing rib; and / or, the inner wall of the first connecting portion is provided with a fourth reinforcing rib; and / or, the outer wall of the second connecting portion is provided with a fifth reinforcing rib.

[0012] The rear side panel of this embodiment is integrally formed by the C-pillar, D-pillar, first connecting part, second connecting part, and third connecting part. Only one mold is needed to form the structure of the triangular window area of ​​the vehicle. This results in a high common mold rate and eliminates the need to fix the various sheet metal parts of the triangular window area together by welding or bolting. The integrally formed rear side panel can be used on various vehicle models and in the development of new models. This shortens the development cycle of the rear side panel for new models and also reduces the design, processing, and fitting cycle of the mold, thereby improving vehicle design and production efficiency and reducing costs. Furthermore, the integrally formed rear side panel has higher structural strength and optimizes the force transmission path on the vehicle body, thus improving vehicle safety performance.

[0013] This application also provides a door ring structure, including the rear side inner panel as described above.

[0014] The door ring structure of this application improves vehicle design, production efficiency and safety performance, and reduces costs by setting a rear side panel.

[0015] This application also provides a vehicle including the door ring structure described above.

[0016] The vehicle in this embodiment improves vehicle design, production efficiency, and safety performance, and reduces costs by incorporating a door ring structure including the aforementioned rear side panel. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the rear side inner panel provided in the embodiment of this application from an inner perspective.

[0018] Figure 2 yes Figure 1 The diagram shows the three-dimensional structure of the rear side panel from an outside view.

[0019] Figure 3 yes Figure 1 The diagram shows an enlarged view of the rear side panel in area A.

[0020] Figure 4 This is a schematic diagram of the door ring structure provided in the embodiments of this application.

[0021] Figure 5 The structural diagram of the vehicle provided in this application embodiment.

[0022] Key component symbols: Vehicle 1000, Door ring structure 100, Rear side panel 1, C-pillar 10, First reinforcing rib 11, D-pillar 20, Second reinforcing rib 21, Honeycomb reinforcing rib 22, First connecting part 30, Overlap part 31, Overlap boss 311, Third reinforcing rib 32, Fourth reinforcing rib 33, Second connecting part 40, Front section 41, Rear section 42, Mounting groove 421, First mating surface 4211, First mounting hole 4211a, Pre-mounting through hole 4211b, Mounting boss 422, Second mating surface 4221 Second mounting hole 4221a, positioning boss 43, fifth reinforcing rib 44, third connecting part 50, positioning groove 51, installation space 60, stop protrusion 61, first protrusion 71, second protrusion 72, third protrusion 73, first mounting boss 731, first mounting hole 7311, fourth protrusion 74, second mounting boss 741, second mounting hole 7411, A-pillar 101, B-pillar 102, lower reinforcing plate of C-pillar 103, upper beam 104, sill 105, front door ring 106, rear door ring 107, triangular window 200. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0024] In the description of this application, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, it should be noted that "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] The following will describe some embodiments of this application in detail with reference to the accompanying drawings.

[0027] Please see Figure 1 and Figure 5 This application provides a rear side panel 1, applied to a vehicle 1000. The vehicle 1000 can be a gasoline-powered vehicle, an electric vehicle, a hybrid vehicle, etc., which is obviously not a limitation of this application.

[0028] Please see Figure 1 , Figure 2 and Figure 5In this embodiment, the rear side inner panel 1 includes an integrally formed C-pillar 10, D-pillar 20, first connecting portion 30, second connecting portion 40, and third connecting portion 50. The C-pillar 10 and D-pillar 20 are spaced apart, and the first connecting portion 30 and second connecting portion 40 are spaced apart. The two ends of the first connecting portion 30 are connected to one end of the C-pillar 10 and one end of the D-pillar 20, respectively. The two ends of the second connecting portion 40 are connected to the other ends of the C-pillar 10 and the other ends of the D-pillar 20, respectively. The C-pillar 10, D-pillar 20, first connecting portion 30, and second connecting portion 40 enclose an installation space 60 for installing the triangular window 200. The first connecting portion 30 is used to connect to the roof panel (not shown) of the vehicle body (not shown), and the second connecting portion 40 is used to connect to the rear wheel arch inner panel (not shown) of the vehicle body. The third connecting part 50 is located in the connection area between the first connecting part 30 and the D-pillar part 20 at a position away from the installation space 60, and the third connecting part 50 extends toward the inside of the first connecting part 30 and the D-pillar part 20. The third connecting part 50 is used to connect with the rear crossbeam (not shown) of the vehicle 1000.

[0029] In this embodiment, the inner side refers to the side of the rear side panel 1 facing the interior of the vehicle 1000, and the outer side refers to the side of the rear side panel 1 facing the exterior of the vehicle 1000.

[0030] In this embodiment, the rear side panel 1 is integrally formed by the C-pillar 10, D-pillar 20, first connecting part 30, second connecting part 40, and third connecting part 50. Only one mold (not shown) is needed to form the structure of the triangular window area of ​​the vehicle 1000. This results in a high common mold rate and eliminates the need to fix the various sheet metal parts of the triangular window area together by welding or bolting. The integrally formed rear side panel 1 can be used on various vehicle models and in the development of new models. This shortens the development cycle of the rear side panel 1 for new models and also reduces the design, processing, and fitting cycle of the mold, thereby improving the design and production efficiency of the vehicle 1000 and reducing costs. Furthermore, the integrally formed rear side panel 1 has higher structural strength and optimizes the force transmission path on the vehicle body, thus improving the safety performance of the vehicle 1000.

[0031] In this embodiment, the C-pillar 10, D-pillar 20, first connecting part 30, second connecting part 40, and third connecting part 50 are integrally formed by aluminum casting. Because aluminum is easy to form, lightweight, and high-strength, the production cost of the rear side panel 1 is reduced, facilitating the weight reduction of the vehicle 1000 and improving its safety performance.

[0032] In this embodiment, the third connecting portion 50 has a first protruding edge 71 on the side near the C-pillar portion 10, and the first connecting portion 30 has a second protruding edge 72 connected to the first protruding edge 71 on the side away from the mounting space 60. The third connecting portion 50 has a third protruding edge 73 on the side away from the C-pillar portion 10, and the D-pillar portion 20 has a fourth protruding edge 74 connected to the third protruding edge 73 on the side away from the mounting space 60.

[0033] The first and third protruding edges 71 and 73 facilitate overlapping with the inner panel (not shown) of the rear crossbeam of the vehicle 1000. The second protruding edge 72 facilitates overlapping with the roof panel of the vehicle body. The fourth protruding edge 74 facilitates support for the tailgate (not shown) of the vehicle 1000.

[0034] In some other embodiments, the rear side inner panel 1 may only have a first protruding edge 71 and a second protruding edge 72, or only have a third protruding edge 73 and a fourth protruding edge 74. This application embodiment does not specifically limit this.

[0035] In this embodiment, a first mounting boss 731 is provided on the outer wall of the third protrusion 73, and a second mounting boss 741 is provided on the outer wall of the fourth protrusion 74. The first mounting boss 731 and the second mounting boss 741 are respectively provided with a first mounting hole 7311 and a second mounting hole 7411. The first mounting hole 7311 is used to install a tailgate hinge (not shown), and the second mounting hole 7411 is used to install a tailgate support rod (not shown). Thus, by providing the first mounting boss 731 and the second mounting boss 741, it is convenient to connect with the corresponding components of the tailgate.

[0036] In this embodiment, the end of the first connecting portion 30 away from the D-pillar portion 20 extends in a direction away from the D-pillar portion 20 and forms an overlapping portion 31. The outer side wall of the overlapping portion 31 is provided with an overlapping boss 311. The overlapping portion 31 is used to connect with the upper beam 104 (e.g., Figure 4 The inner plate of the first connecting part 30 (shown) overlaps with the outer plate of the upper beam 104 (not shown), thereby improving the convenience and stability of the connection between the first connecting part 30 and the upper beam 104.

[0037] In this embodiment, the second connecting portion 40 includes a front section 41 and a rear section 42 connected to each other. The angle between the extending direction of the front section 41 and the extending direction of the rear section 42 is an obtuse angle. The end of the front section 41 away from the rear section 42 is connected to the C-pillar portion 10, and the end of the rear section 42 away from the front section 41 is connected to the D-pillar portion 20. Specifically, the extending direction of the front section 41 is... Figure 1 The direction of F1 in the middle, and the extension direction of the latter part 42 are... Figure 1 The direction is F2.

[0038] This design allows the portion of the installation space 60 near the connection area between the second connecting part 40 and the D-pillar 20 to have a larger angle, thereby effectively reducing blind spots for rear passengers and improving the riding experience.

[0039] In this embodiment, positioning bosses 43 are provided on the inner sidewalls of both the front section 41 and the rear section 42. The positioning bosses 43 are used to position the inner plate of the rear wheel cover, thereby improving the accuracy of the connection between the second connecting part 40 and the inner plate of the rear wheel cover.

[0040] Please refer to the following: Figure 3 In this embodiment, the inner sidewall of the rear section 42 is provided with a mounting groove 421. The bottom of the mounting groove 421 has a first mating surface 4211, and a mounting boss 422 is provided inside the mounting groove 421. The sidewall of the mounting boss 422 has a second mating surface 4221. The first mating surface 4211 is used to abut against the rear air conditioning unit (not shown), and the second mating surface 4221 is used to abut against the lower trim panel of the trunk (not shown). This facilitates the installation of the air conditioning unit and the lower trim panel of the trunk.

[0041] In this embodiment, the first mating surface 4211 has a first assembly hole 4211a and a pre-hanging through hole 4211b. When installing the rear air conditioning unit, the rear air conditioning unit is hung in the pre-hanging through hole 4211b, and then bolts (not shown) are used to pass through the first assembly hole 4211a to fix the rear air conditioning unit, thereby improving the convenience and stability of installing the air conditioning unit.

[0042] In this embodiment, the first mating surface 4211 has a second mounting hole 4221a. When installing the lower trim panel of the luggage compartment, bolts are used to pass through the second mounting hole 4221a to fix the lower trim panel of the luggage compartment, thereby improving the convenience of installing the lower trim panel of the luggage compartment.

[0043] Please refer to it again. Figure 1 and Figure 2 In this embodiment, a positioning groove 51 is provided on the outer wall of the end of the third connecting part 50 away from the first connecting part 30 and the D-column part 20. When the third connecting part 50 is connected to the rear crossbeam, the inner plate of the rear crossbeam is inserted into the positioning groove 51 for positioning, thereby improving the accuracy and stability of the connection between the third connecting part 50 and the rear crossbeam.

[0044] In this embodiment, the outer wall of the C-pillar portion 10 is provided with a first reinforcing rib 11. The outer wall of the D-pillar portion 20 is provided with a second reinforcing rib 21. The inner wall of the D-pillar portion 20 is provided with a honeycomb-shaped reinforcing rib 22. The outer wall of the first connecting portion 30 is provided with a third reinforcing rib 32. The inner wall of the first connecting portion 30 is provided with a fourth reinforcing rib 33. The outer wall of the second connecting portion 40 is provided with a fifth reinforcing rib 44.

[0045] By setting the first reinforcing rib 11, the second reinforcing rib 21, the honeycomb reinforcing rib 22, the third reinforcing rib 32, the fourth reinforcing rib 33 and the fifth reinforcing rib 44, the structural strength of the rear side inner panel 1 is improved, and the rear side inner panel 1 is made lighter.

[0046] In some other embodiments, the rear inner panel 1 may be provided with one or more of the first reinforcing rib 11, the second reinforcing rib 21, the honeycomb reinforcing rib 22, the third reinforcing rib 32, the fourth reinforcing rib 33 and the fifth reinforcing rib 44. This application embodiment does not specifically limit this.

[0047] In this embodiment, the inner wall of the installation space 60 is provided with a stop protrusion 61 extending toward the center of the installation space 60. The stop protrusion 61 is connected to the outer walls of the C-pillar 10, D-pillar 20, first connecting part 30 and second connecting part 40.

[0048] By setting a stop flange 61, when installing the triangular window 200, silicone sealant (not shown) is applied to the inner wall of the stop flange 61. The sealant adheres the triangular window 200 to the stop flange 61, and the stop flange 61 restricts the movement of the triangular window 200 outward from the vehicle 1000. This improves the convenience and stability of installing the triangular window 200.

[0049] In summary, the rear side panel 1 of this embodiment is integrally formed by the C-pillar 10, D-pillar 20, first connecting part 30, second connecting part 40, and third connecting part 50. Only one mold is needed to form the structure of the triangular window area of ​​the vehicle 1000. This results in a high common mold rate and eliminates the need to fix the various sheet metal parts of the triangular window area together through welding, bolting, or other methods. The integrally formed rear side panel 1 can be applied to various vehicle models and the development of new models. This shortens the development cycle of the rear side panel 1 for new models and also reduces the design, processing, and fitting cycle of the mold, thereby improving the design and production efficiency of the vehicle 1000 and reducing costs. Furthermore, the integrally formed rear side panel 1 has higher structural strength and optimizes the force transmission path on the vehicle body, thus improving the safety performance of the vehicle 1000.

[0050] Please refer to the following: Figure 4 This application embodiment also provides a door ring structure 100, including the rear side inner panel 1 as described above.

[0051] The door ring structure 100 of this application improves the design, production efficiency and safety performance of the vehicle 1000 and reduces costs by setting the rear side inner panel 1.

[0052] In this embodiment, the door ring structure 100 includes an A-pillar 101, a B-pillar 102, a lower reinforcing plate 103 of the C-pillar, an upper beam 104, and a threshold 105. Both ends of the B-pillar 102 are connected to the middle of the upper beam 104 and the middle of the threshold 105, respectively. Both ends of the A-pillar 101 are connected to the front end of the upper beam 104 and the front end of the threshold 105, respectively. The A-pillar 101, B-pillar 102, upper beam 104, and threshold 105 together form a front door ring 106. The overlapping portion 31 of the rear inner panel 1 is connected to the rear end of the upper beam 104. One end of the lower reinforcing plate 103 of the C-pillar is connected to the rear end of the threshold 105, and the other end of the lower reinforcing plate 103 is connected to the C-pillar portion 10. The B-pillar 102, upper beam 104, threshold 105, lower reinforcing plate 103 of the C-pillar, and C-pillar portion 10 together form a rear door ring 107. Thus, the door ring structure 100 has a simple structure and fewer parts, thereby improving production efficiency and reducing costs.

[0053] In this embodiment, both the upper beam 104 and the lower C-pillar reinforcing plate 103 are thermoformed parts. The upper beam 104 and the inner panel of the rear side panel 1, as well as the lower C-pillar reinforcing plate 103 and the inner panel of the rear side panel 1, are connected by a self-piercing riveting process. The self-piercing riveting process has strong material adaptability, high connection strength, and high production efficiency, thereby improving the structural strength and production efficiency of the door ring structure 100.

[0054] Please refer to the following: Figure 5 This application also provides a vehicle 1000, including the door ring structure 100 as described above.

[0055] The vehicle 1000 of this application embodiment improves the design, production efficiency and safety performance of the vehicle 1000 by setting a door ring structure 100 including the aforementioned rear side panel 1, and reduces costs.

[0056] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be regarded in all respects as exemplary and not restrictive, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A rear quarter inner panel characterized by, The device includes an integrally formed C-pillar, a D-pillar, a first connecting portion, a second connecting portion, and a third connecting portion. The C-pillar and the D-pillar are spaced apart, as are the first connecting portion and the second connecting portion. The two ends of the first connecting portion are respectively connected to one end of the C-pillar and one end of the D-pillar, and the two ends of the second connecting portion are respectively connected to the other ends of the C-pillar and the D-pillar. The C-pillar, the D-pillar, the first connecting portion, and the second connecting portion enclose an installation space for installing a triangular window. The third connecting portion is located at a position away from the installation space in the connection area between the first connecting portion and the D-pillar, and extends inward toward the first connecting portion and the D-pillar.

2. The rear side inner panel according to claim 1, characterized by The third connecting portion has a first protruding edge on the side near the C-pillar, and the first connecting portion has a second protruding edge connected to the first protruding edge on the side away from the mounting space; and / or, The third connecting portion has a third protruding edge on the side away from the C-pillar portion, and the D-pillar portion has a fourth protruding edge connected to the third protruding edge on the side away from the mounting space.

3. The rear side inner panel according to claim 1, characterized by The C-pillar, the D-pillar, the first connecting portion, the second connecting portion, and the third connecting portion are integrally formed by aluminum casting; and / or A positioning groove is provided on the outer wall of the end of the third connecting part away from the first connecting part and the D-column.

4. The rear side wall inner panel according to claim 1, characterized by The second connecting part includes a front section and a rear section connected to each other. The angle between the extending direction of the front section and the extending direction of the rear section is an obtuse angle. The end of the front section away from the rear section is connected to the C-pillar, and the end of the rear section away from the front section is connected to the D-pillar.

5. The rear side inner panel according to claim 4, characterized by The inner sidewall of the rear section is provided with an installation groove, the bottom of the installation groove has a first matching surface, the installation groove is provided with an installation boss, and the sidewall of the installation boss has a second matching surface.

6. The rear side wall inner panel according to claim 1, characterized by The inner wall of the installation space is provided with a stop protrusion extending toward the center of the installation space, and the stop protrusion is connected to the outer wall of the C-pillar, the D-pillar, the first connecting part and the second connecting part.

7. The rear side wall inner panel according to claim 1, characterized by The first connecting portion extends away from the D-pillar portion at one end and forms an overlapping portion, and the outer side wall of the overlapping portion is provided with an overlapping boss.

8. The rear side wall inner panel according to claim 1, characterized by The outer wall of the C-column is provided with a first reinforcing rib; and / or, The outer wall of the D-column is provided with a second reinforcing rib; and / or, The inner wall of the D-column is provided with honeycomb-shaped reinforcing ribs; and / or, The outer wall of the first connecting part is provided with a third reinforcing rib; and / or, The inner wall of the first connecting part is provided with a fourth reinforcing rib; and / or, The outer wall of the second connecting part is provided with a fifth reinforcing rib.

9. A door ring structure, characterized by Includes the rear side panel as described in any one of claims 1-8.

10. A vehicle characterized by comprising: Includes the door ring structure as described in claim 9.

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