A device and method for verifying and positioning the strength of seat belt anchor points

Abstract

This invention discloses a seatbelt anchor point strength verification and positioning device and method. It includes a seatbelt positioning clamp comprising two stepped steel plates, which are respectively located on the upper body module and on both sides of the seatbelt and arranged parallel to each other. The seatbelt is attached to the upper body module. The lower parts of the two stepped steel plates and the upper body module are connected by a first steel rod, and the upper parts of the two stepped steel plates are connected by a second steel rod. The portion of the second steel rod between the two stepped steel plates serves as a hook connection. This invention solves the problem of consistency between simulation and experiment in seatbelt anchor point strength verification, avoiding the problem of insufficient early verification of the design scheme or failure of later scheme verification due to inconsistent verification methods.

Description

Technical Field

[0001] This invention belongs to the field of automotive seat belt strength verification technology, specifically relating to a seat belt anchor point strength verification positioning device and method. Background Technology

[0002] As a vital means of transportation, safety is one of the most critical performance aspects of automobiles. Seat belts are the most important passenger protection system, playing a crucial role in reducing injuries and fatalities. Therefore, the strength of seat belt anchor points must be fully considered during the design phase of an automobile, and the belts must pass testing according to the national standard GB14167 before formal production.

[0003] In vehicle development, a combination of simulation and testing is generally used to verify the strength of seat belt anchor points. Simulation models are used for strength verification and improvement during the early design phase, followed by real-vehicle verification after the prototype is completed. Ensuring consistency between simulation and testing, and guaranteeing mutual verification between the two, is a problem that needs to be solved.

[0004] For example, patent CN113850003A provides a finite element analysis optimization method for the strength of seat belt anchor points, and discloses the general process and method of seat belt anchor point strength simulation analysis, which is divided into four steps: model building, model optimization, result analysis, and termination. However, it does not describe in detail the rules for placing the human body module, or the constraint state of the human body module in the simulation. The initial position and angle differences of the human body module have an important impact on the test results. Furthermore, if there are certain differences between the simulation and the test, the value of the previous evaluation will be lost or the test verification will not be representative.

[0005] For example, patent CN201611122558.2 provides a testing device for the strength of automotive seat belt anchor points, disclosing a testing device that uses hydraulic thrust for verification, which differs from traditional tensile testing devices. However, it does not involve simulation methods and requires investment and modification of testing equipment, resulting in high costs. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a seat belt anchor point strength verification and positioning device and method.

[0007] The technical solution adopted in this invention is: a seat belt fixing point strength verification and positioning device, including a seat belt positioning clamp, the seat belt positioning clamp including two stepped steel plates, the two stepped steel plates are respectively located on the upper human body module and the two sides of the seat belt and arranged in parallel and spaced apart, the seat belt is attached to the upper human body module, the lower part of the two stepped steel plates and the upper human body module are connected by a first steel rod, the upper part of the two stepped steel plates are connected by a second steel rod, and the part of the second steel rod located between the two stepped steel plates is a hook connection part.

[0008] In a further preferred configuration, the first steel rod passes through the two stepped steel plates and extends out of the stepped steel plates at both ends.

[0009] In a further preferred configuration, the second steel rod passes through the two stepped steel plates and extends out of the stepped steel plates at both ends.

[0010] In a further preferred configuration, the length of the first steel rod is greater than the length of the second steel rod.

[0011] In a further preferred configuration, the stepped steel plate includes a first fixing part, a connecting part, and a second fixing part, which are connected sequentially. The first fixing part is used to fix a first steel bar, the second fixing part is used to fix a second steel bar, and the connecting part is used to connect the first fixing part and the second fixing part.

[0012] In a further preferred configuration, the distance between the two first fixing parts is greater than the distance between the two second fixing parts.

[0013] A method for verifying the strength of a seatbelt anchor point positioning device includes the following steps:

[0014] Install the seatbelt positioning clamp onto the upper human body module, treating the upper human body module and the seatbelt positioning as a single unit. Rotate it a certain angle from the vertical direction until the longitudinal centerline of the upper human body module is in the same plane as the D-Ring point and Buckle point of the seatbelt, completing the fixing point connection of the seatbelt. Connect the hook connection of the second steel bar to the chain model, preload the chain model with an initial force F0, and tighten the seatbelt positioning clamp and the chain model, keeping them in a straight line. Apply a force F to the chain model in the direction specified for strength verification. 极限 A 1g gravity was applied to the upper human body module, and the upper human body module eventually reached force balance, and the simulation strength verification began.

[0015] Furthermore, the chain model serves as the force application module unit during simulation strength verification.

[0016] Furthermore, the value of F0 is 400N to 600N.

[0017] Furthermore, the F 极限 The maximum force that the seat belt anchor point can withstand.

[0018] GB14167 clearly specifies the shape and dimensions of the upper and lower human body modules. The lower human body module, because it is placed on the seat, can be directly connected to the loading point of the module via a hook, and a tensile force in a specified direction can be applied to the end of the hook for testing. The upper human body module, however, is in a quasi-static equilibrium during testing, requiring the addition of clamps to the module. A tensile force is applied to the clamps to achieve overall equilibrium between the module's weight and the seatbelt tension, thus completing the entire test. This invention primarily clarifies a complete process and method for placing the upper human body module in simulation and testing environments using clamps, ensuring consistency between simulation and experimental verification states and guaranteeing that the strength of the seatbelt fixing points meets national standards.

[0019] This invention can solve the problem of consistency between simulation and test in verifying the strength of seat belt anchor points without changing the existing test equipment. It avoids the problem of insufficient verification of the design scheme in the early stage or failure of the scheme verification in the later stage due to inconsistent verification methods, and ensures that the scheme can pass the GB14167 requirements in one go.

[0020] This invention designs a fixture scheme for seat belt anchor point testing without changing existing test equipment. It features simple structure, low cost, stability and reliability, and is convenient for simultaneous use in testing and simulation.

[0021] The simulation and experimental positioning method for the human body module of this invention can solve the consistency problem of the strength verification of seat belt fixing points, ensure the consistency of verification accuracy, and avoid the problem of insufficient verification in the early stage of the design scheme or failure of the later scheme verification due to the inconsistency between the verification methods of experiment and simulation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram illustrating the principle of the method of the present invention;

[0024] Figure 3 This is a schematic diagram illustrating the principle of force application in an embodiment of the present invention.

[0025] In the figure, 1-upper human body module, 2-safety belt, 3-first steel bar, 4-second steel bar (41-hook connection part), 5-step steel plate (51-first fixing part, 52-connecting part, 53-second fixing part). Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0027] Example 1

[0028] like Figure 1 As shown, the present invention provides a seat belt fixing point strength verification and positioning device, including a seat belt positioning clamp. The seat belt positioning clamp includes two stepped steel plates 5. The two stepped steel plates 5 are respectively located on both sides of the upper human body module 1 and the seat belt 2 and are arranged in parallel and spaced apart. The seat belt 2 is attached to the upper human body module 1. The lower parts of the two stepped steel plates 5 and the upper human body module 1 are connected by a first steel rod 3. The upper parts of the two stepped steel plates 5 are connected by a second steel rod 4. The part of the second steel rod 4 located between the two stepped steel plates 5 is a hook connection part 41.

[0029] The first steel rod 3 passes through two stepped steel plates 5 and extends out of the stepped steel plates 5 at both ends. The second steel rod 4 passes through two stepped steel plates 5 and extends out of the stepped steel plates 5 at both ends. The length of the first steel rod 3 is greater than the length of the second steel rod 4.

[0030] The stepped steel plate 5 includes a first fixing part 51, a connecting part 52, and a second fixing part 53. The first fixing part 51, the connecting part 52, and the second fixing part 53 are connected sequentially. The first fixing part 51 is used to fix the first steel rod 3, the second fixing part 53 is used to fix the second steel rod 4, and the connecting part 52 is used to connect the first fixing part 51 and the second fixing part 53. The distance between the two first fixing parts 51 is greater than the distance between the two second fixing parts 53.

[0031] Example 2

[0032] like Figure 2 As shown, the present invention provides a method for verifying and positioning a seat belt anchor point strength, comprising the following steps:

[0033] Install the seatbelt positioning clamp onto the upper human body module 1, positioning the upper human body module 1 and the seatbelt 2 as a single unit. Starting vertically, rotate the upper human body module 1 at a certain angle until the longitudinal centerline of the upper human body module 1 is in the same plane as the D-Ring point and Buckle point of the seatbelt 2. Figure 2 (As shown by the dotted line direction), complete the fixing point connection of the seat belt 2, connect the hook connection part 41 of the second steel bar 4 to the chain model, preload the initial force F0 onto the chain model to tighten the seat belt positioning clamp and the chain model, keeping them in a straight line, and apply force F to the chain model in the direction specified for strength verification. 极限 A 1g gravity was applied to the upper human body module 1, and the upper human body module 1 eventually reached force balance, and the simulation strength verification began.

[0034] GB14167 clearly specifies the dimensions of the upper human body module 1. However, the loading force for the strength test of the safety belt 2 fixing point is achieved by using a hydraulic cylinder to drive the chain. Therefore, a safety belt positioning clamp was designed for connecting the chain model (bar unit) and the upper human body module 1. It consists of two 1cm thick stepped steel plates 5 with holes, two first steel bars 3 and second steel bars 4 with threads at both ends, and four nuts. The structure is simple and easy to operate. In use, the first steel bar 3 is passed through the connection hole between the wide end of the stepped steel plate 5 and the upper human body module 1, and fixed with two nuts. The second steel bar 4 is passed through the narrow end of the stepped steel plate 5, and both ends of the steel bar are fixed with nuts. The hook connection part 41 is used to connect the chain hook, and the steel plates on both sides are used for positioning to prevent the hook from slipping.

[0035] In the experiment, the upper human body module 1 was suspended in mid-air under the combined action of loading force, gravity, and seat belt tension, achieving a quasi-static equilibrium. To ensure consistency between the simulation and the experiment, an upper human body module 1 of the same size and a seat belt positioning fixture needed to be created in the simulation model, and the positioning method needed to be clearly defined. Research revealed that the initial placement angle of the upper human body module 1 had a significant impact on its rapid attainment of equilibrium and the smooth progress of the simulation analysis. The specific steps are as follows:

[0036] Establish a kinematic pair: Based on the actual situation, fix the first steel bar 3 and the second steel bar 4 to the seat belt positioning fixture, so that they move as a whole. Establish a rotational kinematic pair between the seat belt positioning fixture and the upper human body module 1, with the direction of the rotation axis consistent with that of the first steel bar 3 and the second steel bar 4.

[0037] Module angle confirmation: Treat the upper human body module 1 and the seat belt positioning clamp as a whole, and rotate it at a certain angle from the vertical direction until the longitudinal centerline of the upper human body module 1 is in the same plane as the D-Ring point and Buckle point of the seat belt.

[0038] Seat belt modeling: Establish a seat belt model along the upper human body module 1, and complete the connection of the fixing points and the inspection of the seat belt to ensure that the seat belt is free of defects such as wrinkles and curling.

[0039] Load application: such as Figure 3 As shown, the second steel bar 4 is connected to the chain model (bar unit), and a force of 500N is preloaded (perpendicular to the plane containing the line connecting the D-Ring point and the Buckle point, and at an angle of 10°±5° to the horizontal plane) to tighten the seat belt positioning clamp and the chain model, keeping them in a straight line. Finally, a force of 13500N is applied to the chain model in the specified direction (perpendicular to the plane containing the line connecting the D-Ring point and the Buckle point, and at an angle of 10°±5° to the horizontal plane), and a gravity of 1g is applied to the upper human body module 1. The module eventually reaches force equilibrium, and the simulation strength verification can then begin.

[0040] In the experiment, the chain model and safety belt 2 can be connected to the upper human body module 1 first. Then, the upper human body module 1 is placed on the same plane as the D-Ring point and Buckle point of the safety belt. A tension force of 500N is applied. After the upper human body module 1 overcomes gravity and gradually stabilizes, a tension force of 13500N can be applied to officially start the experiment.

[0041] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A seat belt anchor point strength verification and positioning device, characterized in that: The device includes a seat belt positioning clamp, which includes two stepped steel plates (5). The two stepped steel plates (5) are located on both sides of the upper human body module (1) and the seat belt (2) and are arranged in parallel and spaced apart. The seat belt (2) is attached to the upper human body module (1). The lower parts of the two stepped steel plates (5) and the upper human body module (1) are connected by a first steel rod (3). The upper parts of the two stepped steel plates (5) are connected by a second steel rod (4). The part of the second steel rod (4) located between the two stepped steel plates (5) is a hook connection part (41). The first steel rod (3) passes through the two stepped steel plates (5) and extends out of the stepped steel plates (5) at both ends; The second steel bar (4) passes through the two stepped steel plates (5) and extends out of the stepped steel plates (5) at both ends; The length of the first steel rod (3) is greater than the length of the second steel rod (4); The stepped steel plate (5) includes a first fixing part (51), a connecting part (52), and a second fixing part (53). The first fixing part (51), the connecting part (52), and the second fixing part (53) are connected in sequence. The first fixing part (51) is used to fix the first steel rod (3), the second fixing part (53) is used to fix the second steel rod (4), and the connecting part (52) is used to connect the first fixing part (51) and the second fixing part (53). The distance between the two first fixing parts (51) is greater than the distance between the two second fixing parts (53); The method for verifying and positioning the seat belt anchor point strength includes the following steps: Install the safety belt positioning clamp onto the upper human body module (1), positioning the upper human body module (1) and the safety belt (2) as a whole. Rotate it from the vertical direction by a certain angle until the longitudinal central axis of the upper human body module (1) is in the same plane as the D-Ring point and Buckle point of the safety belt (2), completing the connection of the fixed point of the safety belt (2). Connect the hook connection part (41) of the second steel rod (4) to the iron chain model, preload the initial force F0 onto the iron chain model, so that the safety belt positioning clamp and the iron chain model are tightened and kept in a straight line. Apply force F to the iron chain model in the direction specified for strength verification. 极限 A 1g gravity is applied to the upper human body module (1), and the upper human body module (1) eventually reaches force balance, and the simulation strength verification begins.

2. The seat belt anchor point strength verification and positioning device according to claim 1, characterized in that: The chain model is the force application module unit used for simulation strength verification.

3. The seat belt anchor point strength verification and positioning device according to claim 1, characterized in that: The value of F0 is 400N~600N.

4. The seat belt anchor point strength verification and positioning device according to claim 1, characterized in that: The F 极限 The maximum force that the seat belt anchor point can withstand.

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