A crossbeam structure for a car seat based on TRB technology

Abstract

This utility model relates to the field of automotive seat technology, specifically to an upper crossbeam structure for an automotive seat based on TRB technology, including a headrest assembly (1), a side beam (2), an upper crossbeam (3), and a headrest mounting guide sleeve (4). The upper crossbeam (3) is characterized by having a headrest guide sleeve mounting position area (H), a side beam welding area (C), an unequal thickness transition area (T), and a thinning area (D). This utility model is scientifically designed, using differential thickness plate technology to reduce the thickness of the upper crossbeam reasonably. It has a reasonable structure, is safe and reliable, durable, and has an ideal weight reduction effect.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to an upper crossbeam structure for automotive seats based on TRB technology. Background Technology

[0002] Seats are an essential component of automobiles. Currently, the crossbeams of automobile seats are mostly made of uniformly thick steel plates or welded from multiple sections of sheet metal, which has the following drawbacks:

[0003] 1. Weight redundancy: To meet the strength requirements of the headrest installation area, the overall thickness and weight have increased;

[0004] 2. Stress concentration: Stress concentration is likely to occur around the headrest mounting holes, which can easily lead to breakage during long-term use or impact.

[0005] 3. Inadequate testing performance: In static strength tests (such as ECE R17 standard) and dynamic impact tests of headrests, the traditional structure has low energy absorption efficiency, which can easily lead to excessive headrest displacement.

[0006] 4. Complex process: Multi-segment welding process increases manufacturing costs, and the weld area is prone to fatigue weak points. Summary of the Invention

[0007] The purpose of this utility model is to address the shortcomings of the existing technology by providing a crossbeam structure for a car seat based on TRB technology.

[0008] The technical solution adopted in this utility model is as follows:

[0009] A car seat upper crossbeam structure based on TRB technology includes a headrest assembly, side beams, an upper crossbeam, and headrest mounting guide sleeves. The upper crossbeam is characterized by having a headrest guide sleeve mounting position area, a side beam welding area, an unequal thickness transition area, and a thinning area. The thinning area is located in the middle of the upper crossbeam, the side beam welding areas are located on both sides of the upper crossbeam, the headrest guide sleeve mounting position area is located between the thinning area and the side beam welding area, and the unequal thickness transition areas are located on both sides of the headrest guide sleeve mounting position area. The headrest mounting guide sleeves are fixedly installed in the headrest guide sleeve mounting position area of ​​the upper crossbeam. The side beams are fixedly installed on both sides of the upper crossbeam in the side beam welding area. The headrest assembly is fixedly installed in the headrest assembly guide sleeve through its guide tube. The thickness of the headrest guide sleeve assembly position area is less than the thickness of the side beam welding area. The thickness of the thinning area is less than the thickness of the headrest guide sleeve assembly position area. The side beam welding area and the headrest guide sleeve assembly position area are smoothly connected and transitioned through an unequal thickness transition area. The headrest guide sleeve assembly position area and the thinning area are also smoothly connected and transitioned through an unequal thickness transition area.

[0010] The uneven thickness transition zone of the upper crossbeam includes a transition zone one between the side beam welding zone and the headrest guide assembly zone and a transition zone two between the side beam welding zone and the headrest guide assembly zone, as well as a transition zone one between the headrest guide assembly zone and the over-thinning zone and a transition zone two between the headrest guide assembly zone and the over-thinning zone.

[0011] The thickness of the welding area of ​​the side beam is 0.8mm-0.9mm, the thickness of the headrest guide sleeve assembly area is 0.7mm-0.8mm, and the thickness of the thinning area is 0.6mm-0.7mm.

[0012] The welding area of ​​the side beam and the fitting position area of ​​the headrest guide are smoothly transitioned by a double curvature gradient design through the unequal thickness transition area. The fitting position area of ​​the headrest guide and the thinning area are also smoothly transitioned by a double curvature gradient design through the unequal thickness transition area.

[0013] This utility model relates to a car seat upper crossbeam structure based on TRB technology. It is scientifically designed and uses differential thickness plate technology to reasonably reduce the thickness of the upper crossbeam. The structure is reasonable, safe and reliable, durable, and has an ideal weight reduction effect. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the seat;

[0016] Figure 2 This is a schematic diagram of the upper crossbeam structure;

[0017] Figure 3 This is a schematic diagram of the upper crossbeam partitioning;

[0018] Figure 4 for Figure 3 Enlarged sectional view along the AA direction;

[0019] In the diagram: 1-Headrest assembly; 2-Side beam; 3-Upper crossbeam; 4-Headrest assembly guide sleeve; H-Headrest guide sleeve assembly position area; C-Side beam welding area; T-Unequal thickness transition area; D-Thinning area; T1-Transition area one between the side beam welding area and the headrest guide sleeve assembly position area; T2-Transition area one between the headrest guide sleeve assembly position area and the thinning area; T3-Transition area two between the headrest guide sleeve assembly position area and the thinning area; T4-Transition area two between the side beam welding area and the headrest guide sleeve assembly position area; CD-Side beam welding area thickness; HD-Headrest guide sleeve assembly position area thickness; DD-Thinning area thickness. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described below are merely illustrative of this utility model. Key terms that need attention in these descriptions, including "TRB technology," "unequal thickness transition zone," and "thinning zone," are only for the purpose of facilitating and simplifying the description of this utility model, and therefore should not be construed as limiting this utility model.

[0021] like Figure 1-2 As shown, this utility model discloses an automotive seat upper crossbeam structure based on TRB technology. The upper crossbeam 3 features locally thickened side beam welding areas C and headrest guide sleeve assembly areas H, along with a gradient energy absorption scheme in the unequal thickness transition area T. This significantly improves headrest installation strength and collision safety. While ensuring lightweight construction, the structure utilizes a new rolling process—flexible rolling technology—to obtain a continuous variable cross-section thin plate. The differential thickness plate technology is used to reasonably reduce the thickness, achieving integrated molding and avoiding welding defects. This design is suitable for passenger car and commercial vehicle seat systems with high safety requirements. It includes a headrest assembly 1, side beams 2, upper crossbeam 3, and headrest assembly guide sleeves 4. The upper crossbeam 3 has a headrest guide sleeve assembly position area H, a side beam welding area C, an unequal thickness transition area T, and a thinning area D. These longitudinal areas are as follows: the thinning area D is located in the middle of the upper crossbeam 3; the side beam welding area C is located on both sides of the upper crossbeam 3; the headrest guide sleeve assembly position area H is located between the thinning area D and the side beam welding area C; the headrest assembly guide sleeve 4 is fixedly installed in the headrest guide sleeve assembly position area H of the upper crossbeam 3; the side beams 2 are fixedly installed in the side beam welding areas C on both sides of the upper crossbeam 3; and the headrest assembly 1 is fixedly installed in the headrest assembly guide sleeve 4 through its guide tube, forming a skeleton. (See also...) Figure 3-4As shown, the uneven thickness transition zone T of the upper crossbeam 3 includes a transition zone T1 between the side beam welding area and the headrest guide assembly area, and a second transition zone T4 between the side beam welding area and the headrest guide assembly area. It also includes a transition zone T2 between the headrest guide assembly area and the thinning area, and a second transition zone T3 between the headrest guide assembly area and the thinning area. The thickness HD of the headrest guide assembly area is less than the thickness CD of the side beam welding area, and the thickness DD of the thinning area is less than the thickness HD of the headrest guide assembly area. In this embodiment, the thickness CD of the side beam welding area is 0.8-0.9 mm, and the thickness HD of the headrest guide assembly area is... The thickness HD is 0.7-0.8mm, the thickness DD of the thinning zone is 0.6-0.7mm, the integral upper crossbeam 3, the side beam welding area C and the headrest guide assembly position area H are smoothly connected and transitioned through the transition area T1 of the side beam welding area and the headrest guide assembly position area with unequal thickness transition area T, or the transition area T4 of the side beam welding area and the headrest guide assembly position area. The headrest guide assembly position area H and the thinning zone D are smoothly connected and transitioned through the transition area T2 of the headrest guide assembly position area and the thinning zone with unequal thickness transition area T, or the transition area T3 of the headrest guide assembly position area and the thinning zone.

[0022] The seat width described in this utility model is generally 300-400mm, and the seat width in this embodiment is 360mm. The upper crossbeam 3 is made of high-quality, high-strength hot-rolled pickled steel plate (QSte420TM). The specific design of this embodiment is as follows:

[0023] I. Zoning

[0024] 1. Headrest assembly guide sleeve assembly location area H:

[0025] The cover extends to the headrest guide rod mounting hole and a 50mm radius around it. It uses a folded edge snap-fit ​​matching method with the mounting hole of the headrest assembly guide sleeve 4, which avoids the risk of damage from punched burrs during the assembly of the plastic guide sleeve. At the same time, the folded edge positioning is used to ensure the stability of the headrest assembly guide sleeve 4 assembly.

[0026] The mounting hole edges are chamfered progressively (R angle 3-5mm) to reduce stress concentration.

[0027] 2. Unequal thickness transition zone T:

[0028] The unequal thickness transition zone T is located on both sides of the headrest guide assembly area H, and its length is 80-100 times the thickness difference (for example, when the thickness difference is 0.1mm, the transition zone is 8-10mm long and the thickness gradually changes from 0.7mm to 0.6mm).

[0029] The unequal thickness transition zone T adopts a double curvature gradient design for a smooth transition and avoids abrupt changes in stiffness.

[0030] 3. Edge beam welding zone C:

[0031] The welding area C of the side beam is the welding area between it and the side beam 2. It is subjected to greater stress, so its thickness is 0.8-0.9mm.

[0032] 4. Thinning zone D:

[0033] Lightweighting is achieved by reducing the thickness of the D layer.

[0034] II. Application of TRB Technology

[0035] 1. Two sets of upper crossbeams are symmetrically arranged along the length of the sheet metal, with a material utilization rate of ≥70%;

[0036] 2. Rolling tolerance is controlled within ±0.05mm;

[0037] 3. After hot stamping, the yield strength of the sheet metal is ≥1200MPa and the tensile strength is ≥1600MPa.

[0038] III. Testing Performance Advantages

[0039] 1. Static strength test of headrest assembly: The radial reinforcing rib design of the headrest assembly guide sleeve assembly position area H increases the tensile strength of the mounting point by 30% and reduces the displacement by 40%;

[0040] 2. Dynamic impact test: The energy absorption ratio of the uneven thickness transition zone T reaches 60%, and the peak impact force is reduced by 15% (meeting the C-NCAP 5-star requirements).

[0041] 3. Fatigue test: The radial reinforcing rib design increases cycle life by 50% and prevents the propagation of peripore cracks.

[0042] This utility model relates to a car seat upper crossbeam structure based on TRB technology. The thickness of the upper crossbeam 3 was measured by CATIA software. The original weight was 0.438 kg. After reducing the thickness using the differential thickness plate technology of this utility model, the measured weight is 0.378 kg. The weight reduction is approximately 14%.

[0043] The above description is only a general embodiment of this utility model. For those skilled in the art, there are various other embodiments with modifications and variations, which will not be elaborated here. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model are included within the protection scope claimed by this utility model.

Claims

1. A crossbeam structure for an automotive seat based on TRB technology, comprising a headrest assembly (1), a side beam (2), an upper crossbeam (3), and a headrest mounting guide sleeve (4), characterized in that: The upper crossbeam (3) is provided with a headrest guide sleeve assembly position area (H), a side beam welding area (C), an unequal thickness transition area (T), and a thinning area (D). The thinning area (D) is located in the middle of the upper crossbeam (3), the side beam welding area (C) is located on both sides of the upper crossbeam (3), the unequal thickness transition area (T) is located on both sides of the headrest guide sleeve assembly position area (H), the headrest guide sleeve assembly position area (H) is located between the thinning area (D) and the side beam welding area (C), the headrest assembly guide sleeve (4) is fixedly installed in the headrest guide sleeve assembly position area (H) of the upper crossbeam (3), and the side beam (2) is fixedly installed in the side beam welding areas (C) on both sides of the upper crossbeam (3). The headrest assembly (1) is fixedly installed in the headrest assembly guide sleeve (4) through its conduit. The thickness (HD) of the headrest guide sleeve assembly position area (H) is less than the thickness (CD) of the side beam welding area (C). The thickness (DD) of the thinning area (D) is less than the thickness (HD) of the headrest guide sleeve assembly position area (H). The side beam welding area (C) and the headrest guide sleeve assembly position area (H) are smoothly connected and transitioned through an unequal thickness transition area (T). The headrest guide sleeve assembly position area (H) and the thinning area (D) are smoothly connected and transitioned through an unequal thickness transition area (T).

2. The automotive seat upper crossbeam structure based on TRB technology according to claim 1, characterized in that: The uneven thickness transition zone (T) of the upper crossbeam (3) includes a transition zone one (T1) between the side beam welding zone and the headrest guide assembly position zone and a transition zone two (T4) between the side beam welding zone and the headrest guide assembly position zone, as well as a transition zone one (T2) between the headrest guide assembly position zone and the thinning zone and a transition zone two (T3) between the headrest guide assembly position zone and the thinning zone.

3. The automotive seat upper crossbeam structure based on TRB technology according to claim 1, characterized in that: The thickness (CD) of the welding area of ​​the side beam is 0.8mm-0.9mm, the thickness (HD) of the headrest guide fitting position area is 0.7mm-0.8mm, and the thickness (DD) of the thinning area is 0.6mm-0.7mm.

4. The automotive seat upper crossbeam structure based on TRB technology according to claim 1, characterized in that: The side beam welding area (C) and the headrest guide assembly area (H) are smoothly transitioned by a double curvature gradient design through an unequal thickness transition area (T). The headrest guide assembly area (H) and the thinning area (D) are also smoothly transitioned by a double curvature gradient design through an unequal thickness transition area (T).

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