A seat cushion assembly stiffness measurement device and method

Abstract

This invention discloses a seat cushion assembly stiffness measuring device and method, comprising a seat plate, a shaft, a bracket, a level, and several sets of counterweights. The seat plate is shaped to match the seat back and seat surface for contact with them. Both ends of the shaft are connected to the seat plate. The shaft has two sets of equidistant shoulders, and a pointer rotatable around the shaft's center. Both ends of the bracket are connected to the ends of the shaft and are rotatable around it. The level is mounted on the bracket. Each set of counterweights is divided into two equal parts, symmetrically mounted on the shaft with the seat plate's central axis as the center, and limited by the two sets of equidistant shoulders on the shaft. This invention can determine the relationship between the overall deformation of materials such as seat upholstery, polyurethane foam, and supports and the driver's weight, thus completing the stiffness measurement of a seat cushion assembly system including materials such as upholstery, polyurethane foam, and supports.

Description

Technical Field

[0001] This invention belongs to the field of vehicle cab ergonomics design, specifically relating to a seat cushion assembly stiffness measuring device and method. Background Technology

[0002] Currently, in vehicle development, ergonomic design hard points are designed and simulated using 3D software. While this provides parameters for each ergonomic hard point, it cannot accurately reflect the actual state of a vehicle. Measuring these ergonomic design hard points is essential for evaluating the merits of vehicle ergonomic design schemes.

[0003] Currently, the measurement of hard points in ergonomic design is mainly achieved through H-point measuring devices, which measure the SIP point (driver's seat calibration point) of the seat under the conditions specified by SAE standards. However, during actual vehicle driving, because the driver's weight cannot be guaranteed to remain at a fixed value (e.g., 75kg), the seat experiences varying forces, leading to different deformations in materials such as seat upholstery, polyurethane foam, and supports. Consequently, the actual H-point position is not exactly the same for drivers of the same height but different weights. This positional error between the actual H-point and the designed H-point caused by driver weight will affect the quality of the vehicle's ergonomic design.

[0004] In the seating industry, the stiffness measurement of seat foam materials primarily employs a press for loading and sensors to record deformation and stress. This requires computer assistance and a laboratory with a power supply. Furthermore, it imposes limitations on sample size, necessitating the destruction and cutting of the tested seat to extract the foam material from the seat surface. More importantly, it can only measure the stiffness of polyurethane foam, and cannot measure the combined stiffness of seat upholstery, support springs, and other components, making it unsuitable for measurement in actual vehicles. Summary of the Invention

[0005] To address the aforementioned issues, this invention proposes a seat cushion assembly stiffness measuring device and method, which can determine the relationship between the overall deformation of materials such as seat upholstery, polyurethane foam, and supports and the driver's weight, thereby completing the stiffness measurement of the seat cushion assembly system including materials such as upholstery, polyurethane foam, and supports.

[0006] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0007] In a first aspect, the present invention provides a seat cushion assembly stiffness measuring device, comprising:

[0008] Seat plate, the shape of which matches the seat back and seat surface, for fitting against the seat back and seat surface;

[0009] The shaft has two ends connected to the base plate; the shaft has two sets of equidistant shoulders, and a pointer that can rotate around the shaft is located at the center of the shaft.

[0010] A bracket, the two ends of which are respectively connected to the two ends of the shaft, and can rotate around the shaft;

[0011] A level, which is mounted on the bracket;

[0012] Several sets of counterweights, each set of counterweights is divided into two parts of equal weight, and are symmetrically and movably mounted on the shaft with the central axis of the seat plate as the center, and are limited by two sets of equidistant shoulders on the shaft.

[0013] Optionally, one end of the pointer is provided with a counterweight.

[0014] Optionally, each counterweight is provided with a groove, the cross-section of which matches the cross-section of the shaft.

[0015] Optionally, the seat plate includes a connected base plate and a side plate, both of which are curved surfaces.

[0016] Optionally, the position of each counterweight near the side plate is set with a chamfer to adapt to the curved surface structure of the side plate.

[0017] Optionally, when the bracket is raised around the axis to the locking position, the bracket is in a vertical state.

[0018] Secondly, the present invention provides a method for measuring the stiffness of a seat cushion assembly, comprising:

[0019] Place the seat board on the seat of the vehicle to be measured, and ensure that it is in contact with the seat back and seat surface;

[0020] Lift the bracket connected to the base plate around the axis to the locking position, so that the bracket is in a vertical state, and fix the bracket.

[0021] Use the level on the support to adjust the posture and position of the seat plate to ensure that both sides of the seat plate are level.

[0022] Place each set of counterweights sequentially on the shaft on the base plate from directly above, so that the counterweight groove matches the shaft, and restrict the position of the counterweights by the shaft shoulder to ensure that the center of gravity of the counterweights on both sides is symmetrical with respect to the central axis of the base plate.

[0023] The pointer located on the axis can rotate freely around the axis and always remain vertical. The height of the pointer tip from the ground is measured each time a set of counterweights is added, thus calculating the vertical deformation Δh of the seat cushion caused by each added set of counterweights. n ;

[0024] Based on the preset formula for calculating the stiffness of the seat cushion assembly system, and the vertical deformation Δh of the seat cushion caused by each added set of counterweights. n The stiffness of the seat cushion assembly system is calculated by considering the mass of each set of counterweights.

[0025] Optionally, one end of the pointer is provided with a counterweight, so that the pointer can rotate freely around the axis and always remain in a vertical state.

[0026] Optionally, each counterweight is provided with a groove, the cross-section of which matches the cross-section of the shaft; the seat plate includes a connected base plate and a side plate, both of which are curved surfaces; the position of each counterweight near the side plate is set with a chamfer to adapt to the curved surface structure of the side plate.

[0027] Optionally, the formula for calculating the stiffness of the seat cushion assembly system is:

[0028]

[0029] In the formula, k is the stiffness of the seat cushion assembly system, Δm is the mass of a single counterweight, and Δh is the mass of the counterweight. n The vertical deformation of the seat cushion caused by adding a set of counterweights is given by n, where n is the number of counterweights and g is the acceleration due to gravity.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] This invention proposes a seat cushion assembly stiffness measuring device and method, which can determine the relationship between the total deformation of materials such as seat cover, polyurethane foam, and supports and the driver's weight, and complete the stiffness measurement of the seat cushion assembly system including materials such as cover, polyurethane foam, and supports.

[0032] This invention effectively reduces the number of assembly parts through innovative structural design, and all parts can be manually disassembled and assembled, making it easier to use. Attached Figure Description

[0033] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0034] Figure 1 This is one of the overall structural schematic diagrams of a seat cushion assembly stiffness measuring device according to an embodiment of the present invention;

[0035] Figure 2 This is a second schematic diagram of the overall structure of the seat cushion assembly stiffness measuring device according to an embodiment of the present invention;

[0036] Figure 3 This is an exploded structural diagram of a seat cushion assembly stiffness measuring device according to an embodiment of the present invention;

[0037] in:

[0038] 1-Seat plate, 2-Bracket, 2.1-First support rod, 2.2-Second support rod, 2.3-Third support rod, 3-Pointer, 4-Counterweight, 4.1-Groove, 5-Level, 6-Shaft, 6.1-Shaft shoulder. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of protection of the invention.

[0040] In the description of this invention patent, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this invention patent 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. Therefore, they should not be construed as limitations on this invention patent.

[0041] In the description of this invention patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The application principle of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] Example 1

[0044] This invention provides a seat cushion assembly stiffness measuring device, comprising: a seat plate 1, a shaft 6, a bracket 2, a level 5, and several sets of counterweights 4;

[0045] The shape of the seat plate 1 matches the seat back and seat surface, and is used to fit against the seat back and seat surface;

[0046] The two ends of the shaft 6 are respectively connected to the seat plate 1; the shaft 6 is provided with two sets of equidistant shoulders 6.1, and the center of the shaft 6 is provided with a pointer 3 that can rotate around the shaft 6; the shaft 6 is used to represent the driver's seat calibration point, that is, the SIP point of the seat.

[0047] The two ends of the bracket 2 are respectively connected to the two ends of the shaft 6, and can rotate around the shaft 6, that is, the two ends of the shaft 6 are the fixed points of the bracket 2.

[0048] The level 5 is mounted on the bracket 2;

[0049] Each set of counterweights 4 is divided into two parts of equal weight, and is symmetrically and movably installed on the shaft 6 with the central axis of the seat plate 1 as the center. It is limited by two sets of equidistant shoulders 6.1 on the shaft 6. Multiple sets of equal weight counterweights 4 are used to evenly distribute the driver's weight on the shaft 6.

[0050] Based on the seat cushion assembly stiffness measuring device in this embodiment of the invention, the relationship between the total deformation of materials such as seat cover, polyurethane foam, and supports and the driver's weight can be determined, and the stiffness of the seat cushion assembly system including materials such as cover, polyurethane foam, and supports can be measured.

[0051] In one specific embodiment of the present invention, in order to ensure that the pointer 3 can always remain vertical and avoid measurement errors caused by the pointer 3 being skewed, a counterweight is provided at one end of the pointer 3.

[0052] In one specific embodiment of the present invention, to facilitate the installation of the counterweight 4 onto the shaft 6, each counterweight 4 is provided with a groove 4.1. The cross-section of the groove 4.1 matches the cross-section of the shaft 6, enabling manual disassembly and assembly, and making the entire seat cushion assembly stiffness measuring device easier to use. In the specific implementation process, the counterweight 4 is placed on the shaft 6 from directly above the seat plate 1, so that the groove on the counterweight 4 matches the shaft 6, and the position of the counterweight 4 is restricted by the shaft shoulder 6.1 to ensure that the center of gravity of the counterweights on both sides is symmetrical with respect to the central axis of the seat plate 1.

[0053] In one specific embodiment of the present invention, the seat plate 1 includes a bottom plate 1.1 and a side plate 1.2 connected together. In order to achieve a perfect fit with the seat back and seat surface, both the bottom plate 1.1 and the side plate 1.2 are curved surfaces. The specific structure of the bottom plate 1.1 and the side plate 1.2 is determined according to the actual results of the seat back and seat surface. Different seat plate structures are designed for different seat backs and seat surfaces.

[0054] In one specific embodiment of the present invention, the position of each counterweight 4 near the side plate 1.2 is set as a chamfer to adapt to the curved surface structure of the side plate 1.2.

[0055] In one specific embodiment of the present invention, when the bracket 2 is raised to the locking position around the axis 6, the bracket 2 is fixed and in a vertical state to ensure that the level 5 is in a horizontal state, so as to adjust the posture and position of the seat plate 1 and ensure that both sides of the seat plate 1 are horizontal (i.e., both sides of the bottom plate of the seat plate 1 are in a horizontal state), avoiding measurement errors caused by uneven force on the seat due to device tilt. In the specific implementation process, the bracket 2 includes a first support rod 2.1, a second support rod 2.2 and a third support rod 2.3 arranged sequentially. The first support rod 2.1 and the third support rod 2.3 are arranged opposite to each other, and the second support rod 2.2 is perpendicular to the first support rod 2.1 and the third support rod 2.3.

[0056] The specific method of using the seat cushion assembly stiffness measuring device in this embodiment of the invention is as follows:

[0057] Place the seat plate 1 on the seat of the vehicle to be measured, and make it fit against the seat back and seat surface;

[0058] Raise bracket 2 around axis 6 to the locking position, so that bracket 2 is in a vertical state, and fix bracket 2.

[0059] The posture and position of the seat plate 1 are adjusted by referring to the level 5 on the bracket 2 to ensure that both sides of the seat plate 1 are level.

[0060] Each set of counterweights 4 is placed sequentially from directly above on the shaft 6 on the seat plate 1, so that the counterweight groove matches the shaft 6, and the position of the counterweights 4 is restricted by the shaft shoulder 6.1 to ensure that the center of gravity of the counterweights on both sides is symmetrical with respect to the central axis of the seat plate 1.

[0061] The pointer 3, located on axis 6, can rotate freely around axis 6 and always remain vertical. Each time a set of counterweights 4 is added, the height of the pointer 3 from the ground is measured, thereby calculating the vertical deformation Δh of the seat cushion caused by each added set of counterweights 4. n ;

[0062] Based on the preset formula for calculating the stiffness of the seat cushion assembly system, and the vertical deformation Δh of the seat cushion caused by each added set of counterweights 4, n Based on the mass of the single counterweight 4, the stiffness of the seat cushion assembly system is calculated. Specifically, the formula for calculating the stiffness of the seat cushion assembly system is:

[0063]

[0064] In the formula, k is the stiffness of the seat cushion assembly system, Δm is the mass of a single counterweight 4, and Δh is... n The vertical deformation of the seat cushion caused by adding a set of counterweights 4 is given by n, where n is the number of sets of counterweights 4, and g is the acceleration due to gravity.

[0065] Example 2

[0066] This invention provides a method for measuring the stiffness of a seat cushion assembly, comprising:

[0067] Place the seat plate 1 on the seat of the vehicle to be measured, and make it fit against the seat back and seat surface;

[0068] Lift the bracket 2 connected to the base plate 1 around the shaft 6 to the locking position, so that the bracket 2 is in a vertical state, and fix the bracket 2.

[0069] The posture and position of the seat plate 1 are adjusted by referring to the level 5 on the bracket 2 to ensure that both sides of the seat plate 1 are level.

[0070] Each set of counterweights 4 is placed sequentially from directly above on the shaft 6 on the seat plate 1, so that the counterweight groove matches the shaft 6, and the position of the counterweights 4 is restricted by the shaft shoulder 6.1 to ensure that the center of gravity of the counterweights on both sides is symmetrical with respect to the central axis of the seat plate 1.

[0071] The pointer 3, located on axis 6, can rotate freely around axis 6 and always remain vertical. Each time a set of counterweights 4 is added, the height of the pointer 3 from the ground is measured, thereby calculating the vertical deformation Δh of the seat cushion caused by each added set of counterweights 4. n ;

[0072] Based on the preset formula for calculating the stiffness of the seat cushion assembly system, and the vertical deformation Δh of the seat cushion caused by each added set of counterweights 4, n The stiffness of the seat cushion assembly system is calculated based on the mass of the single counterweight 4.

[0073] In one specific embodiment of the present invention, in order to ensure that the pointer 3 can always remain vertical and avoid measurement errors caused by the pointer 3 being skewed, a counterweight is provided at one end of the pointer 3.

[0074] In one specific embodiment of the present invention, to facilitate the installation of the counterweight 4 onto the shaft 6, each counterweight 4 is provided with a groove 4.1. The cross-section of the groove 4.1 matches the cross-section of the shaft 6, enabling manual disassembly and assembly, and making the entire seat cushion assembly stiffness measuring device easier to use. In the specific implementation process, the counterweight 4 is placed on the shaft 6 from directly above the seat plate 1, so that the groove on the counterweight 4 matches the shaft 6, and the position of the counterweight 4 is restricted by the shaft shoulder 6.1 to ensure that the center of gravity of the counterweights on both sides is symmetrical with respect to the central axis of the seat plate 1.

[0075] In one specific embodiment of the present invention, the seat plate 1 includes a bottom plate 1.1 and a side plate 1.2 connected together. In order to achieve a perfect fit with the seat back and seat surface, both the bottom plate 1.1 and the side plate 1.2 are curved surfaces. The specific structure of the bottom plate 1.1 and the side plate 1.2 is determined according to the actual results of the seat back and seat surface. Different seat plate structures are designed for different seat backs and seat surfaces.

[0076] In one specific embodiment of the present invention, the position of each counterweight 4 near the side plate 1.2 is set as a chamfer to adapt to the curved surface structure of the side plate 1.2.

[0077] In one specific embodiment of the present invention, when the bracket 2 is raised to the locking position around the axis 6, the bracket 2 is fixed and in a vertical state to ensure that the level 5 is in a horizontal state, so as to adjust the posture and position of the seat plate 1, ensure that both sides of the seat plate 1 are horizontal, and avoid the device being tilted, which would cause uneven force on the seat and result in measurement errors. In the specific implementation process, the bracket 2 includes a first support rod 2.1, a second support rod 2.2, and a third support rod 2.3 arranged sequentially. The first support rod 2.1 and the third support rod 2.3 are arranged opposite to each other, and the second support rod 2.2 is perpendicular to the first support rod 2.1 and the third support rod 2.3.

[0078] In one specific embodiment of the present invention, the formula for calculating the stiffness of the seat cushion assembly system is as follows:

[0079]

[0080] In the formula, k is the stiffness of the seat cushion assembly system, Δm is the mass of a single counterweight 4, and Δh is... n The vertical deformation of the seat cushion caused by adding a set of counterweights 4 is given by n, where n is the number of sets of counterweights 4, and g is the acceleration due to gravity.

[0081] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A seat cushion assembly stiffness measuring device, characterized in that, include: Seat plate, the shape of which matches the seat back and seat surface, for fitting against the seat back and seat surface; The shaft has two ends connected to the base plate; the shaft has two sets of equidistant shoulders, and a pointer that can rotate around the shaft is located at the center of the shaft. A bracket, the two ends of which are respectively connected to the two ends of the shaft, and can rotate around the shaft; A level, which is mounted on the bracket; Several sets of counterweights, each set of counterweights is divided into two parts of equal weight, and is symmetrically and movably mounted on the shaft with the central axis of the seat plate as the center, and is limited by two sets of equidistant shoulders on the shaft; One end of the pointer is equipped with a counterweight; When the bracket is raised around the axis to the locking position, the bracket is in a vertical state; The formula for calculating the stiffness of the seat cushion assembly system is: ， In the formula, For the stiffness of the seat cushion assembly system, This refers to the mass of a single set of counterweights. To determine the vertical deformation of the seat cushion caused by adding a set of counterweights. The number of counterweight groups. This is the acceleration due to gravity.

2. The seat cushion assembly stiffness measuring device according to claim 1, characterized in that: Each counterweight has a groove, and the cross-section of the groove matches the cross-section of the shaft.

3. The seat cushion assembly stiffness measuring device according to claim 1, characterized in that: The seat plate includes a connected base plate and a side plate, both of which are curved surfaces.

4. The seat cushion assembly stiffness measuring device according to claim 3, characterized in that: The counterweights are chamfered near the side plates to accommodate the curved surface of the side plates.

5. A method for measuring the stiffness of a seat cushion assembly, characterized in that, include: Place the seat board on the seat of the vehicle to be measured, and ensure that it is in contact with the seat back and seat surface; Lift the bracket connected to the base plate around the axis to the locking position, so that the bracket is in a vertical state, and fix the bracket. Use the level on the support to adjust the posture and position of the seat plate to ensure that both sides of the seat plate are level. Place each set of counterweights sequentially on the shaft on the base plate from directly above, so that the counterweight groove matches the shaft, and restrict the position of the counterweights by the shaft shoulder to ensure that the center of gravity of the counterweights on both sides is symmetrical with respect to the central axis of the base plate. The pointer located on the axis can rotate freely around the axis and always remain vertical. The height of the pointer tip from the ground is measured each time a set of counterweights is added, thus calculating the vertical deformation of the seat cushion caused by each added set of counterweights. ; Based on the preset formula for calculating the stiffness of the seat cushion assembly system, and the vertical deformation of the seat cushion caused by each added set of counterweights. The stiffness of the seat cushion assembly system is calculated based on the mass of a single counterweight. One end of the pointer is equipped with a counterweight, which allows the pointer to rotate freely around the axis and always remain in a vertical position. The formula for calculating the stiffness of the seat cushion assembly system is: ， In the formula, For the stiffness of the seat cushion assembly system, This refers to the mass of a single set of counterweights. To determine the vertical deformation of the seat cushion caused by adding a set of counterweights. The number of counterweight groups. This is the acceleration due to gravity.

6. The method for measuring the stiffness of a seat cushion assembly according to claim 5, characterized in that: Each counterweight has a groove, the cross-section of which matches the cross-section of the shaft; the base plate includes a connected bottom plate and a side plate, both of which are curved surfaces; the position of each counterweight near the side plate is chamfered to fit the curved surface structure of the side plate.

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