Modular car rear seat frame structure based on performance customization

Abstract

A kind of modular car rear row seat skeleton structure based on performance customization, comprising: four, six split seat skeleton structures arranged side by side, four, six split seat skeleton structures respectively comprising: backrest tube frame, positioner and its connecting piece, seat pan tube frame, seat pan connecting horizontal, longitudinal beam, seat positioner and its connecting piece. According to performance requirements, variable strength and variable thickness tube frame structure integrated design customization is used, the four, six split seat skeleton structure itself forms the variable strength structure with the same cross section but the strength changes distribution, while the seat pan skeleton adopts integral variable thickness structure, which reduces the number of connecting pieces and welds and realizes weight reduction while meeting performance requirements;Six split seat positioner backrest connecting plate innovative design can be directly inserted into the lower part of six split seat positioner connecting pipe, meet the needs of structural design and improve the strength of skeleton;Four, six split seat backrest tube frame connecting edge plate uses the same structure parts, and share the same cushion connecting plate, connected with seat pan connecting horizontal beam and can rotate independently, reduce the cost of parts;Part tube diameter and thickness are merged, realize modular design and maximum mold sharing rate, realize rear row seat skeleton modularization and lightweight design.

Description

Technical Field

[0001] This invention relates to automotive parts, specifically to a modular automotive rear seat frame structure, which can be customized by adopting an integrated design of variable strength and variable thickness tubular frame structure according to specific performance requirements. Background Technology

[0002] With the continuous development of the automotive industry, seats, as a crucial safety component, are facing increasingly stringent safety standards, requiring seat frames to meet higher performance requirements. Existing tubular rear seat frames primarily use materials such as Q235 and QSTE420, and are mostly constructed from round tubes connected by welding. Since direct connection between the round tubes and seat limiters is difficult, larger stamped parts are often used for connection. However, these stamped parts have significant weight and high manufacturing costs. Furthermore, due to the lower strength of tubular components manufactured using traditional methods, thicker tubing and additional reinforcements are often used to improve the rigidity of the seat frame. This results in a large number of parts and welds, low modular integration, and difficulty in meeting the demands for lightweight design and energy conservation.

[0003] With the continuous improvement of lightweighting standards and increasingly stringent safety standards, the current rear seat frame mainly achieves lightweighting and meets performance requirements by optimizing the frame structure and utilizing advanced lightweight materials.

[0004] Patent CN113212271A, filed by Guojin Automotive, discloses a high-strength rear seat frame for automobiles. It features multiple U-shaped stamped diagonal supports between the front and rear seat legs, and multiple seat cushion horizontal and vertical plates within the seat frame. These diagonal supports and the horizontal and vertical plates, together with the seat frame and seat legs, form a truss structure, thereby enhancing the strength of the rear seat frame.

[0005] Patent CN104875653B, filed by Jilin University, discloses a hybrid material passenger car rear seat frame. It uses glass fiber long fiber composite material and glass fiber continuous fiber composite material to manufacture the seat back frame through single-stage injection or press molding process, which ensures that the rear seat has sufficient impact resistance and achieves lightweight design.

[0006] The applicant, Hongli Zhixin Automotive Parts, disclosed a rear seat frame in patent CN105459868B, which includes a backrest frame and a four-bar linkage mechanism for the seat frame. The main body of the front support of the seat frame is made of arc-shaped stamped steel plate and is welded and fixed to the horizontal connecting pipe through a semi-enclosed part, resulting in a firm and reliable connection.

[0007] Patent CN112046367A, filed by Guangzhou Automobile, discloses a rear seat frame, including a backrest assembly and a seat cushion assembly. The backrest frame has reinforcing plates directly installed on the horizontal and diagonal tubes to increase strength. The backrest frame is connected to the seat cushion assembly via an adjuster, and the seat cushion frame is connected to a flip-up bracket via an elastic reset component, allowing the backrest assembly and seat cushion assembly to flip independently.

[0008] The aforementioned existing technologies all improve strength by setting up reinforcing plates or using lightweight, high-strength materials, resulting in complex structures or cumbersome processes, which is not conducive to achieving modularization and lightweighting. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a modular automotive rear seat frame structure. This modular rear seat frame structure can be customized using an integrated design of variable strength and variable thickness tubular frame structures according to specific performance requirements. It offers a simple structure, convenient assembly, and reduces the number of stamped and reinforcing parts for the seat. According to this invention, it not only solves problems such as weak impact resistance, complex manufacturing processes, numerous components, and high development costs, but also improves performance indicators in key seat operating conditions such as trunk impact and seatbelt anchor point strength. Furthermore, its simple structure and convenient assembly reduce the number of stamped and reinforcing parts, offering advantages in low cost and lightweight technology.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] A modular automotive rear seat frame structure includes: a four-part seat frame structure and a six-part seat frame structure arranged side by side, wherein the four-part seat frame structure and the six-part seat frame structure each include:

[0012] The seat backrest frame includes a limiter, a connecting side plate for the seat backrest frame, a seat basin frame, a connecting crossbeam for the seat basin, and a connecting longitudinal beam for the seat basin; the six-point seat frame structure also includes a limiter connecting tube, characterized in that...

[0013] The four- or six-point seat frame structure can be customized using an integrated design of variable strength and variable thickness tubular frame structure according to performance requirements.

[0014] The seat back tube frame structure itself forms a variable strength structure with the same cross-section but varying strength distribution.

[0015] The seat back tube frame is a frame structure formed by two tube assemblies, and the frame structure of the seat back tube frame is provided with at least two strength reinforcement areas.

[0016] A reinforced transition region is provided between two adjacent regions with different strengths, and the tensile strength of the reinforced transition region follows a linear variation law.

[0017] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0018] The tensile strength of the reinforced region is 900–2000 MPa, the tensile strength of the unreinforced region is 600–800 MPa, and the tensile strength of the transition region follows a linear variation pattern.

[0019] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0020] The tubular components of the frame structure form a variable thickness structure with the same cross-section but varying thickness distribution.

[0021] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0022] For unreinforced areas of the frame structure, perform partial flattening on two sides or on one side.

[0023] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0024] The aforementioned basin tube frame is a U-shaped circular tube frame structure, and the basin tube frame structure itself forms a variable thickness structure with the same cross section but varying thickness distribution.

[0025] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0026] The basin tube frame structure has at least four equal thickness regions, and thickness transition sections are set between the equal thickness regions. The tensile strength of the thickness transition sections follows a linear variation law.

[0027] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0028] The six-seat limiter (400) includes: a seat cushion connecting plate (410), a locking mechanism (420), a rivet (430), a return spring (440), and a backrest connecting plate (450). One end of the seat cushion connecting plate (410) is connected to the seat basin connecting beam (800), and the other end is connected to the backrest connecting plate (450) and the locking mechanism (420) through the rivet (430).

[0029] The return spring (440) is used to restore the backrest to its original position. The backrest connecting plate (450) is connected to the locking mechanism (420) and the seat cushion connecting plate (410) below.

[0030] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0031] The upper cross-section of the six-point seat limiter backrest connecting plate (450) is rectangular, allowing direct insertion into the six-point seat limiter connecting tube (500), which connects to the six-point backrest frame (200).

[0032] By designing the upper cross section of the limiter backrest connecting plate into a rectangle, a rectangular tube (500) is used instead of a large stamped part to connect the limiter and the backrest frame.

[0033] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0034] The six-point seat limiter connecting tube is composed of a rectangular tube. The six-point seat limiter connecting tube itself forms a variable thickness structure with the same cross section but varying thickness distribution, and has at least two equal thickness regions. A thickness transition section is designed between the equal thickness regions, and the thickness of the thickness transition section conforms to a linear variation law.

[0035] According to the present invention,

[0036] The seat basin connecting beam is made of a rectangular cross-section straight tube, which is connected to both ends of the seat basin frame, the four-part seat limiter, the six-part seat limiter connecting plate, and the seat cushion connecting plate.

[0037] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0038] The aforementioned six-point seat back tube frame (200) is a frame structure formed by tubular components, such as... Figure 3 As shown, it includes a U-shaped round tube (220) and a G-shaped round tube (210). Preferably, one end of the U-shaped round tube (220) and the G-shaped round tube (210) are connected by arc welding, and the weld (230) is located inside the position wrapped by the six-point backrest connecting plate. The other end is connected by a Z-shaped connecting plate (240), which increases the rigidity of the six-point seat back tube frame and reduces the manufacturing difficulty of the six-point backrest tube frame. The frame structure has at least two reinforced regions (250) and unreinforced regions (260) and (270). A transition region (280) is provided between two adjacent regions of different strengths (250) and (260, 270). The tensile strength of the reinforced region (250) is 900-2000 MPa, the tensile strength of the unreinforced region (260, 270) is 600-800 MPa, and the tensile strength of the transition region (280) follows a linear variation law.

[0039] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0040] The aforementioned seat basin connecting longitudinal beam is made of a rectangular cross-section bent pipe, connecting the seat basin frame and the seat basin connecting cross beam.

[0041] The longitudinal beam itself forms a variable thickness structure with the same cross section but varying thickness distribution. It has a region of equal thickness along the length of the longitudinal beam connecting the seat basin, and a thickness transition section is designed between the regions of equal thickness.

[0042] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0043] The connecting tube of the six-point seat limiter has at least two equal thickness regions at different parts. The thickness of the tube can be adjusted between 0.9 and 2 mm. A transition region is provided between two adjacent regions of different thicknesses. The thickness of the transition region basically conforms to the linear change law and the thickness-to-length ratio is less than 1:100.

[0044] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0045] The four- and six-quarter seat backrest tube frame connecting side plates share a single seat cushion connecting plate, which is connected to the seat cushion connecting plate via a pin, allowing the four- and six-quarter seat backrests to rotate independently. Furthermore, the connecting side plates of the four- and six-quarter seat backrest tube frames are identical structural parts.

[0046] The modular automotive rear seat frame structure according to the present invention is characterized in that,

[0047] The aforementioned basin frame structure is roughly U-shaped, with at least four equal-thickness regions on the frame structure. The thickness of the pipe can be adjusted between 0.9 and 2 mm. A transition region is provided between two adjacent regions of different thicknesses. The thickness of the transition region basically follows a linear variation law, and the thickness-to-length ratio must be less than 1:100.

[0048] According to the modular automotive rear seat frame structure of the present invention,

[0049] The backrest connecting plate of the four-quarter seat limiter is provided with a bending angle, so that the backrest connecting plate and the partially flattened unreinforced area of ​​the four-quarter seat backrest tube frame are directly connected by bolts, providing a new connection method between the backrest connecting plate and the backrest tube frame, which can reduce the number of stamped parts.

[0050] This improves safety performance, achieves lightweight design, and meets process requirements.

[0051] According to the present invention,

[0052] The frame structure itself forms a variable strength structure with the same cross-section but varying strength distribution. The quarter-seat limiter includes: a seat cushion connecting plate, a locking mechanism, a rivet, a return spring, and a backrest connecting plate. One end of the seat cushion connecting plate is connected to the seat frame, and the other end is connected to the backrest connecting plate and the locking mechanism via the rivet. The return spring and unlocking bracket are used to restore the backrest to its original position. The lower part of the backrest connecting plate is connected to the locking mechanism and the seat cushion connecting plate, and the upper part of the backrest connecting plate is connected to the quarter-seat backrest tube frame.

[0053] The six-point seat limiter includes: a seat cushion connecting plate, a locking mechanism, a rivet, a return spring, and a backrest connecting plate. One end of the seat cushion connecting plate is connected to the seat basin connecting beam, and the other end is connected to the backrest connecting plate and the locking mechanism via the rivet. The return spring and unlocking bracket are used to restore the backrest to its original position. The backrest connecting plate is connected to the locking mechanism and the seat cushion connecting plate at its lower part, and the backrest connecting plate is connected to the six-point backrest frame via a rectangular tube.

[0054] The four- or six-point seat back tube frame connecting side plate is used to connect the seat back tube frame and the seat cushion connecting plate. The upper end of the four- or six-point seat back tube frame connecting side plate is C-shaped and can wrap around a round tube, directly connecting to the back tube frame. The lower end is provided with a mounting hole and is connected to the seat cushion connecting plate through a pin.

[0055] The frame structure itself forms a variable strength structure with the same cross-section but varying strength distribution, which is obtained as follows:

[0056] The first step is to process the sheet material of thermoforming material into tubular components with the final cross-sectional shape;

[0057] The second step is to heat the formed tubular assembly and then bend the heated tubular assembly online.

[0058] The third step is to heat-treat the pipe fittings while bending them to form a reinforced area, an unreinforced area, and a transition area.

[0059] The fourth step is to connect the pipe components end to end to form a frame structure.

[0060] A new connection method is adopted for the frame structure, which uses a limiter connecting plate to the backrest frame. The unreinforced areas are locally flattened, so that the four-quarter seat backrest tube frame can be directly connected to the four-quarter seat limiter connecting plate with bolts, and the installation of the seat headrest is also convenient.

[0061] A novel connection method is adopted for the frame structure, which connects the backrest skeleton to the six-point seat backrest tube frame. The unreinforced areas are partially flattened, so that the six-point seat backrest tube frame can be directly connected to the six-point seat limiter connecting tube by bolts, and the installation of the seat headrest is also convenient.

[0062] The six-point seat back tube frame also has a zigzag connector for connecting the tube frames on both sides of the six-point seat back limiter to enhance the strength of the six-point seat back tube frame.

[0063] The upper section of the six-point seat limiter backrest connecting plate is rectangular, which can be directly inserted into the six-point seat limiter connecting tube. The six-point seat limiter connecting tube is connected to the six-point backrest tube frame to ensure that the seat backrest has sufficient strength.

[0064] The six-point seat limiter connecting pipe is a rectangular tube. The lower end of the tube is inserted into the six-point seat limiter backrest connecting plate, and the upper end is connected to the six-point seat backrest tube frame. The thickness of different parts of the tube is controlled according to performance requirements, with at least two equal-thickness regions. The tube thickness can be adjusted between 0.9 and 2 mm. A transition region is provided between two adjacent regions of different thicknesses. The thickness of the transition region basically follows a linear variation law, and the thickness-to-length ratio must be less than 1:100. The frame structure itself forms a variable-thickness structure with the same cross-section but varying thickness distribution, as follows:

[0065] The first step is to process the sheet material of variable thickness thermoforming material into a tubular assembly with the final cross-sectional shape;

[0066] The second step is to heat the formed tubular assembly and then bend the heated tubular assembly online.

[0067] The third step is to heat-treat and strengthen the pipe fittings while bending them.

[0068] The six-point seat limiter connecting tube adopts a variable thickness structure, replacing the traditional stamped part connecting the limiter and the backrest tube frame. It adopts a reasonable structural thickness distribution form, giving full play to the functional role of different functional areas. While ensuring that the seat back meets the strength requirements of the seat belt fixing point, it improves the material utilization rate and achieves lightweight design.

[0069] Beneficial effects of this invention:

[0070] (1) This invention uses ultra-high strength materials to replace ordinary strength materials for seat frame tubing, achieving lightweighting by reducing the thickness of the tubing while maintaining comparable performance. The ultra-high strength tubing is bent using an online hot bending forming process, which reduces the difficulty of bending and manufacturing ultra-high strength tubing and shortens the forming process.

[0071] (2) In this invention, the four-part seat limiter connecting plate is directly connected to the seat back tube frame through an innovative design, which reduces the number of connecting parts and achieves weight reduction. The six-part seat limiter connecting plate is connected to the back tube frame through a variable thickness rectangular tube, which satisfies the seat belt installation strength and achieves lightweighting.

[0072] (3) In this invention, the four- and six-point seat basins adopt an integrated structural design, and the seat basin tube frame adopts a variable thickness structure according to performance requirements, so as to achieve lightweight while meeting strength performance.

[0073] (4) In this invention, the four- and six-point seat back tube frame adopts an integrated structure to the greatest extent, reducing the number of welds, and the tube frame structure is locally reinforced based on the variable strength process, so as to achieve lightweight while meeting safety performance.

[0074] (5) The present invention consolidates the pipe diameter and thickness of the seat frame parts to realize the modular design of the four- and six-point backrest frame and the seat cushion frame, maximizes the mold sharing rate, and reduces the manufacturing cost of the seat frame. Attached Figure Description

[0075] Figure 1 This is a schematic diagram of the modular automotive rear seat frame structure of the present invention.

[0076] Figure 2 This is a schematic diagram of the four-part backrest tube frame structure of the modular automotive rear seat frame structure of the present invention.

[0077] Figure 3 This is a schematic diagram of the six-part backrest tube frame structure of the modular automotive rear seat frame structure of the present invention.

[0078] Figure 4 This is a schematic diagram of the four-part seat limiter structure of the modular automotive rear seat frame structure of the present invention.

[0079] Figure 5 This is a schematic diagram of the six-part seat limiter structure of the modular automotive rear seat frame structure of the present invention.

[0080] Figure 6 This is a schematic diagram of the six-part seat limiter connecting pipe structure of the modular automotive rear seat frame structure of the present invention.

[0081] Figure 7 This is a schematic diagram showing the thickness distribution of the connecting pipe of the six-part seat limiter in the modular automotive rear seat frame structure of the present invention.

[0082] Figure 8 This is a schematic diagram of the four- and six-part seat backrest tube frame connecting side plate structure of the modular automotive rear seat frame structure of the present invention.

[0083] Figure 9 This is a schematic diagram of the seat basin tube frame structure of the modular automotive rear seat frame structure of the present invention.

[0084] Figure 10 This is a schematic diagram of the thickness distribution of the seat basin tube frame in the modular automotive rear seat frame structure of the present invention.

[0085] Figure 11 This is a schematic diagram of the seat basin connecting beam structure of the modular automotive rear seat frame structure of the present invention.

[0086] Figure 12 This is a schematic diagram of the seat basin connecting longitudinal beam structure of the modular automotive rear seat frame structure of the present invention.

[0087] Figure 13 This is a schematic diagram of the thickness distribution of the longitudinal beams connecting the seat basin in the modular automotive rear seat frame structure of the present invention. Detailed Implementation

[0088] Example

[0089] The modular automotive rear seat frame structure of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0090] A modular automotive rear seat frame structure, such as Figure 1 As shown, it includes: a four-quarter seat backrest tube frame 100, a six-quarter seat backrest tube frame 200, a four-quarter seat limiter 300, a six-quarter seat limiter 400, a six-quarter seat limiter connecting tube 500, a four-quarter and six-quarter seat backrest tube frame connecting side plate 600, a seat basin tube frame 700, a seat basin connecting crossbeam 800, and a seat basin connecting longitudinal beam 900.

[0091] The aforementioned four-part seat backrest tube frame 100 is a frame structure formed by tubular components, such as... Figure 2 As shown, the frame includes two U-shaped tubes 110 connected by arc welding. The welds 120 are symmetrically arranged to reduce the manufacturing difficulty of the quarter-back frame. The frame structure has at least two reinforced regions 130 and unreinforced regions 140 and 150. A transition region 160 is provided between adjacent regions of different strengths 130 and 140 / 150. The tensile strength of the reinforced region 130 is 900–2000 MPa, the tensile strength of the unreinforced regions 140 and 150 is 600–800 MPa, and the tensile strength of the transition region 160 basically follows a linear variation law. The frame structure itself forms a variable strength structure with the same cross-section but varying strength distribution, specifically including the following implementation steps:

[0092] The first step is to process the sheet material of thermoforming material into tubular components with the final cross-sectional shape;

[0093] The second step is to heat the formed tubular assembly and then bend the heated tubular assembly online.

[0094] The third step is to heat-treat the pipe fittings while bending them to form a reinforced area, an unreinforced area, and a transition area.

[0095] The fourth step is to connect the pipe components end to end to form a frame structure.

[0096] The unreinforced area 140 of the frame structure is partially flattened on both sides, allowing the quarter-section seat backrest tube frame 100 to be directly connected to the quarter-section seat limiter connecting plate 350 via bolts through the flattened unreinforced area 140. The unreinforced area 150 of the frame structure is partially flattened on one side to facilitate the installation of the seat headrest. Compared to the traditional connection method between the round tube and the seat limiter, this new connection method between the limiter connecting plate and the backrest frame, while ensuring seat performance, reduces the number of stamped parts and achieves weight reduction.

[0097] The aforementioned six-part seat backrest tube frame 200 is a frame structure formed by tubular components, such as... Figure 3 As shown, the structure includes a U-shaped round tube 220 and a G-shaped round tube 210. Preferably, one end of the U-shaped round tube 220 and the G-shaped round tube 210 are connected by arc welding, with the weld 230 located within the area enclosed by the six-point backrest connecting plate. The other end is connected by a Z-shaped connecting plate 240, which increases the rigidity of the six-point seat backrest frame and reduces the manufacturing difficulty of the six-point backrest frame. The frame structure has at least two reinforced regions 250 and unreinforced regions 260 and 270. A transition region 280 is provided between two adjacent regions of different strengths, 250 and 260, 270. The tensile strength of the reinforced region 250 is 900-2000 MPa, the tensile strength of the unreinforced regions 260 and 270 is 600-800 MPa, and the tensile strength of the transition region 280 basically follows a linear variation law. The frame structure itself forms a variable strength structure with the same cross section but varying strength distribution. The specific implementation steps are as described in the above-mentioned four-part backrest tube frame.

[0098] The unreinforced area 270 of the frame structure is partially flattened on both sides, allowing the six-point seat backrest tube frame 200 to be directly bolted to the six-point seat limiter connecting tube 500 in the flattened unreinforced area 270. One side of the unreinforced area 260 of the frame structure is also partially flattened to facilitate the installation of the seat headrest. Compared to the traditional connection method between the round tube and the seat limiter, this new connection method between the limiter connecting plate and the backrest frame, while ensuring seat performance, reduces the number of stamped parts and achieves weight reduction.

[0099] The four-seat limiter 300, such as Figure 4As shown, the system includes: a seat cushion connecting plate 310, a locking mechanism 320, a rivet 330, a return spring 340, and a backrest connecting plate 350. The lower end of the seat cushion connecting plate 310 is connected to the seat frame via a side plate, and the other end is connected to the backrest connecting plate 350 and the locking mechanism 320 via the rivet 330. The return spring 340 is used to restore the backrest to its original position. The lower part of the backrest connecting plate 350 is connected to the locking mechanism 320 and the seat cushion connecting plate 310. Preferably, the upper end of the backrest connecting plate 350 has an added bend angle, which can be directly connected to the flattened, unreinforced area 140 of the quarter-seat backrest tube frame 100 via bolts. Compared to most seats, while ensuring seat performance, the addition of a bend angle at the upper end of the backrest connecting plate 350 and the adoption of a new connection method between the backrest connecting plate and the backrest tube frame eliminates the need for stamped parts used to connect the limiter and the backrest frame, achieving a lightweight design.

[0100] The six-seat limiter 400, such as Figure 5 As shown, the backrest includes: a seat cushion connecting plate 410, a locking mechanism 420, a rivet 430, a return spring 440, and a backrest connecting plate 450. One end of the seat cushion connecting plate 410 is connected to the seat basin connecting beam 800, and the other end is connected to the backrest connecting plate 450 and the locking mechanism 420 via the rivet 430. The return spring 440 is used to restore the backrest to its original position. The backrest connecting plate 450 is connected to the locking mechanism 420 and the seat cushion connecting plate 410 at its lower part. Preferably, the upper cross-section of the backrest connecting plate 450 is rectangular, allowing direct insertion into the six-point seat limiter connecting tube 500, which connects to the six-point backrest frame 200. Compared to most seats, this design eliminates the need for stamped parts to connect the limiter and the backrest frame, while ensuring seat performance. This is achieved by designing the upper cross section of the limiter backrest connecting plate as rectangular and using a rectangular tube 500 instead of a large stamped part to connect the limiter and the backrest frame.

[0101] The six-point seat limiter connecting pipe 500, such as Figure 6 As shown, the lower end of the pipe is inserted into the upper end of the six-point seat limiter backrest connecting plate 450, and connected to the six-point seat limiter backrest connecting plate 450 through the 550 bolt hole. The upper end of the pipe is connected to the six-point seat backrest tube frame 200. The thickness of different parts of the pipe is controlled according to the performance requirements, with at least three equal thickness regions 510, 520, and 530. The pipe thickness can be adjusted between 0.9 and 2 mm, and the thickness distribution is as follows. Figure 7 As shown, a transition region 540 is provided between two adjacent regions of different thicknesses. The thickness of the transition region basically follows a linear variation law, and the thickness-to-length ratio must be less than 1:100. The frame structure itself forms a variable thickness structure with the same cross-section but varying thickness distribution, which specifically includes the following implementation steps:

[0102] The first step is to process the sheet material of variable thickness thermoforming material into a tubular assembly with the final cross-sectional shape;

[0103] The second step is to heat the formed tubular assembly and then bend the heated tubular assembly online.

[0104] The third step is to heat-treat and strengthen the pipe fittings while bending them.

[0105] The six-point seat limiter connecting tube adopts a variable thickness structure, replacing the traditional stamped part connecting the limiter and the backrest tube frame. It adopts a reasonable structural thickness distribution form, giving full play to the functional role of different functional areas. While ensuring that the seat back meets the strength requirements of the seat belt fixing point, it improves the material utilization rate and achieves lightweight design.

[0106] The four- or six-point seat backrest frame connecting side plate 600, such as Figure 8 The system includes a six-part seat backrest frame connecting plate 610, a four-part seat backrest frame connecting plate 620, bolts 650, bolt sleeves 630 and 640, and nuts 660. The six-part and four-part seat backrest frame connecting plates 610 and 620 are identical structural parts. The upper end of the connecting plate is C-shaped and can wrap around the round backrest tube for direct connection. The lower end has bolt mounting holes, and bolts 650 connect it to the seat cushion connecting plate 670. Preferably, the six-part and four-part seat backrest frame connecting plates 610 and 620 share a single seat cushion connecting plate 670, which connects to the seat basin connecting beam 800. The six-part and four-part seat backrest frame connecting plates 610 and 620 respectively mate with bolt sleeves 640 and 630, and are connected to the seat cushion connecting plate via bolts 650, allowing independent rotation of the four-part and six-part seat backrests.

[0107] The basin frame 700, such as Figure 9 As shown, the frame structure is roughly U-shaped. The thickness of different parts of the pipe fittings is controlled according to their performance requirements, with at least four equal-thickness zones: 710, 720, 730, and 740. The pipe fitting thickness can be adjusted between 0.9 and 2 mm, as shown in the thickness distribution diagram. Figure 10 As shown, a transition region 750 is provided between two adjacent regions of different thicknesses. The thickness of the transition region basically follows a linear variation law, and the thickness-to-length ratio must be less than 1:100. The frame structure itself forms a variable thickness structure with the same cross-section but varying thickness distribution. The specific implementation steps are described in the section on the six-point seat limiter connecting pipe.

[0108] The seat frame adopts a variable thickness structure and a reasonable structural thickness distribution to give full play to the functions of different functional areas. While ensuring the overall rigidity and modal performance requirements of the seat, it improves the material utilization rate and achieves lightweight design.

[0109] The seat connecting beam 800, such as Figure 11 As shown, it is connected to both ends of the seat frame, the four-part seat limiter, the six-part seat limiter connecting plate, and the seat cushion connecting plate. It adopts a rectangular cross-section straight tube to combine the four-part and six-part seat beams. The rectangular tube has better load-bearing capacity and cost. Compared with the traditional separate four-part and six-part seat beams, it has better stiffness and modal performance.

[0110] The aforementioned seat basin connecting longitudinal beam 900 is a rectangular tube, such as... Figure 12 As shown, the connecting frame of the basin pipe and the connecting beam of the basin are connected. The thickness of different parts of the pipe is controlled according to the performance requirements of the pipe. There are at least three equal thickness zones 910, 920, and 930. The thickness of the pipe can be adjusted between 0.9 and 2 mm. The thickness distribution is as follows. Figure 13 As shown, a transition region 940 is provided between two adjacent regions of different thicknesses. The thickness of the transition region basically follows a linear variation law, and the thickness-to-length ratio must be less than 1:100. The frame structure itself forms a variable thickness structure with the same cross-section but varying thickness distribution. The specific implementation steps are described in the section on the six-point seat limiter connecting pipe.

[0111] The seat basin connecting longitudinal beam adopts a variable thickness structure and a reasonable structural thickness distribution, which makes full use of the functions of different functional areas. While ensuring the overall rigidity performance requirements of the seat, it can reduce the number of local reinforcing parts, improve material utilization, and achieve lightweight design.

[0112] Performance tests were conducted on the basic and existing rear seat frame designs, including tests for trunk impact, seatbelt anchor point strength, and ISOFIX anchor point conditions. The results showed that, while meeting regulatory requirements, the present invention's design demonstrated improved performance compared to previous designs. Due to the extensive use of B1500HS tubular frame components, the weight of the seat frame was reduced from 34.4 kg in the basic design to 27.59 kg, a weight reduction of 19.8%. Furthermore, the cost was reduced from 618.43 yuan in the basic design to 512.32 yuan, achieving a cost reduction of 17.2%.

[0113]

[0114]

Claims

1. A performance-customized modular automotive rear seat frame structure, comprising: The four-part seat frame structure and the six-part seat frame structure are arranged side by side. The four-part seat frame structure and the six-part seat frame structure each include: The seat backrest frame includes a limiter, a connecting side plate for the seat backrest frame, a seat basin frame, a connecting crossbeam for the seat basin, and a connecting longitudinal beam for the seat basin; the six-point seat frame structure also includes a limiter connecting tube, characterized in that... The four- and six-part seat frame structures are custom-designed using an integrated tubular frame structure with variable strength and thickness, based on performance requirements. The seat back tube frame structure itself forms a variable strength structure with the same cross-section but varying strength distribution. The seat back tube frame is a frame structure formed by two tube assemblies, and the frame structure of the seat back tube frame is provided with at least two strength reinforcement areas. A reinforced transition region is provided between two adjacent regions of different strengths. The tensile strength of the reinforced transition region varies linearly. The backrest connecting plate of the six-point seat limiter is directly inserted below the connecting tube of the six-point seat limiter; The four- and six-point seat backrest frame connecting side plates use the same structural parts and share the same seat cushion connecting plate, which is connected to the seat basin connecting beam and can rotate independently. The aforementioned basin frame is a U-shaped circular tube frame structure, and the basin frame frame structure itself forms a variable thickness structure with the same cross-section but varying thickness distribution. The basin tube frame structure has at least four equal-thickness zones, with thickness transition sections between them. The tensile strength of the thickness transition sections follows a linear variation law. The six-seat limiter (400) includes: a seat cushion connecting plate (410), a locking mechanism (420), a rivet (430), a return spring (440), and a backrest connecting plate (450). One end of the seat cushion connecting plate (410) is connected to the seat basin connecting beam (800), and the other end is connected to the backrest connecting plate (450) and the locking mechanism (420) through the rivet (430). The return spring (440) is used to restore the backrest to its original position. The backrest connecting plate (450) is connected to the locking mechanism (420) and the seat cushion connecting plate (410) at the bottom. The upper cross-section of the six-point seat limiter backrest connecting plate (450) is rectangular, and it is directly inserted into the six-point seat limiter connecting tube (500), and connected to the six-point seat backrest tube frame (200) through the six-point seat limiter connecting tube (500). By designing the upper cross section of the backrest connecting plate of the limiter into a rectangle, a six-point seat limiter connecting tube (500) is used instead of a large stamped part to connect the limiter and the backrest frame.

2. The modular automotive rear seat frame structure according to claim 1, characterized in that, The tensile strength of the reinforced region is 900–2000 MPa, the tensile strength of the unreinforced region is 600–800 MPa, and the tensile strength of the transition region follows a linear variation pattern.

3. The modular automotive rear seat frame structure according to claim 1, characterized in that, The tubular components of the frame structure form a variable thickness structure with the same cross-section but varying thickness distribution.

4. The modular automotive rear seat frame structure according to claim 1, characterized in that, For unreinforced areas of the frame structure, perform partial flattening on two sides or on one side.

5. The modular automotive rear seat frame structure according to claim 1, characterized in that, The six-point seat limiter connecting tube is composed of a rectangular tube. The six-point seat limiter connecting tube itself forms a variable thickness structure with the same cross section but varying thickness distribution, and has at least two equal thickness regions. A thickness transition section is designed between the equal thickness regions, and the thickness of the thickness transition section conforms to a linear variation law.

6. The modular automotive rear seat frame structure according to claim 1, characterized in that, The six-point seat back tube frame (200) is a frame structure formed by tubular components, including a U-shaped round tube (220) and a G-shaped round tube (210). One end of the U-shaped round tube (220) and the G-shaped round tube (210) are connected by arc welding, and the weld (230) is located inside the position wrapped by the six-point back connecting plate. The other end is connected by a zig-shaped connecting plate (240), which increases the rigidity of the six-point seat back tube frame and reduces the manufacturing difficulty of the six-point back tube frame.

7. The modular automotive rear seat frame structure according to claim 1, characterized in that, The aforementioned seat basin connecting longitudinal beam is made of a rectangular cross-section bent pipe, connecting the seat basin frame and the seat basin connecting cross beam. The longitudinal beam itself forms a variable thickness structure with the same cross section but varying thickness distribution. It has a region of equal thickness along the length of the longitudinal beam connecting the seat basin, and a thickness transition section is designed between the regions of equal thickness.

8. The modular automotive rear seat frame structure according to claim 6, characterized in that, The connecting tube of the six-point seat limiter has at least two equal thickness regions at different parts, and the thickness of the tube is adjusted between 0.9 and 2 mm. A transition region is provided between two adjacent regions of different thicknesses. The thickness of the transition region follows a linear change law and the thickness-to-length ratio is less than 1:

100.

9. The modular automotive rear seat frame structure according to claim 1, characterized in that, The four- and six-quarter seat backrest tube frame connecting side plates share a single seat cushion connecting plate, which is connected to the seat cushion connecting plate via a pin, enabling the four- and six-quarter seat backrests to rotate independently. Furthermore, the connecting side plates of the four- and six-quarter seat backrest tube frames are identical structural parts.

10. The modular automotive rear seat frame structure according to claim 1, characterized in that, The aforementioned basin tube frame structure is U-shaped, with at least four equal-thickness regions on the frame structure. The thickness of the tube is adjusted between 0.9 and 2 mm. A transition region is provided between two adjacent regions of different thicknesses. The thickness of the transition region follows a linear variation law, and the thickness-to-length ratio must be less than 1:100.

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