A measuring device for measuring the torsional stiffness of a car seat recliner

Abstract

The present invention discloses a measuring device for measuring the torsional stiffness of a car seat recliner, comprising a first column and a second column arranged vertically and located on both sides, a fixed pulley being installed on the top of the second column, a first connecting plate and a second connecting plate being fixedly installed on both sides of the recliner, the second connecting plate being installed on the bottom of the second column, a connecting force rod mechanism being also set up between the first connecting plate and the first column, one end of a loading steel cable being connected to the connecting force rod mechanism, and the other end being connected to an oil cylinder after passing around the fixed pulley, the loading steel cable being pulled by the oil cylinder, and the loading steel cable then driving the connecting force rod mechanism to rotate, and when the connecting force rod mechanism is rotated, the recliner is driven to twist through the first connecting plate, thereby measuring the torsional stiffness of the recliner. The measuring device can measure the torsional stiffness of the recliner.

Description

Technical Field

[0001] The invention relates to measuring equipment for an automobile seat recliner, in particular to a measuring device for measuring the torsional rigidity of an automobile seat recliner. Background Art

[0002] The car seat recliner is used to adjust the seat back angle, and when the seat is in normal use, the backrest is locked in the use position by its locking mechanism, so that the driver or passengers can have a comfortable riding environment. Figure 1 As shown, as a safety component of the car seat, the recliner 19 must not only meet the requirements of comfort and ease of operation, but also meet the requirements of strength and safety.

[0003] Car seat design is a systematic matching design. The recliner is a key component connecting the seat back and the seat cushion. Its strength and stiffness directly affect the matching design of the strength and stiffness of the seat back and the seat cushion.

[0004] The test found that the torsional stiffness of the recliner directly affects the test results of seat rear impact, whiplash (CN-CAP2018), headrest static strength (GB 15083-2006), etc. At present, CAE simulation analysis technology is widely used in the research and development of automotive seats. CAE analysis technology can be used to optimize the strength and stiffness matching of headrests, backrests, and seat cushions. Therefore, accurate measurement of the torsional stiffness curve of the recliner is crucial.

[0005] The traditional measurement method of the torsional stiffness curve of the recliner is rough and has low precision. In addition, the recliner is subjected to radial force during the measurement process, which affects the torsional stiffness of the recliner. There is an urgent need to develop a device that can accurately measure the torsional stiffness curve of the recliner. Summary of the invention

[0006] The object of the present invention is to provide a measuring device for measuring the torsional stiffness of a car seat recliner, wherein the measuring device can measure the torsional stiffness of the recliner.

[0007] The above-mentioned purpose of the present invention is achieved through the following technical scheme: a measuring device for measuring the torsional stiffness of a car seat recliner, characterized in that: the measuring device includes a first column and a second column which are vertically arranged and located on both sides, a fixed pulley is installed on the top of the second column, and a first connecting plate and a second connecting plate are fixedly installed on both sides of the recliner, respectively, and the second connecting plate is installed on the bottom of the second column. A connecting force rod mechanism is also set up between the first connecting plate and the first column, one end of the loading steel cable is connected to the connecting force rod mechanism, and the other end is connected to the cylinder after passing around the fixed pulley, and the loading steel cable is pulled by the cylinder, and the loading steel cable drives the connecting force rod mechanism to rotate, and when the connecting force rod mechanism rotates, the recliner is driven to twist through the first connecting plate, thereby measuring the torsional stiffness of the recliner.

[0008] In the present invention, the connecting force rod mechanism includes a first connecting rod, a second connecting rod, a third connecting rod, a first stabilizing rod and a second stabilizing rod, the first connecting rod is hinged on the first column, the inner end of the second connecting rod is fixedly connected to the first connecting plate, the inner end of the third connecting rod is hinged to the inner end of the second connecting rod, the outer end of the second connecting rod and the outer end of the third connecting rod are respectively hinged to the chain, and the chain is perpendicular to the third connecting rod, that is, the second connecting rod, the third connecting rod and the chain form a right triangle; the first connecting rod and the third connecting rod are arranged in parallel, the first stabilizing rod and the second stabilizing rod are arranged in parallel, The rod is fixedly mounted on the first connecting rod and the third connecting rod, and is perpendicular to the first connecting rod and the third connecting rod, that is, the first connecting rod, the third connecting rod, the first stabilizing rod and the second stabilizing rod form a rectangle; the loading cable is connected to the second stabilizing rod; the measuring device utilizes the stability of the triangle and the two-force rod principle to drive the connecting force rod mechanism to rotate through the loading cable, and finally applies torque to the angle adjuster through the second connecting rod and the first connecting plate to measure the torsional stiffness of the angle adjuster, and the measuring device can also ensure that the angle adjuster is only subjected to torque when twisted, eliminating the influence of radial force on the torsional stiffness of the angle adjuster.

[0009] In the present invention, a positioning clamp is welded on the second stabilizing rod, a loading U-shaped ring is sleeved on the positioning clamp, and the loading steel cable is connected to the loading U-shaped ring.

[0010] In the present invention, the first stabilizing rod and the second stabilizing rod are fixedly welded to the first connecting rod and the third connecting rod by argon arc welding.

[0011] In the present invention, two surfaces of the angle adjuster are welded to the first connecting plate and the second connecting plate respectively.

[0012] In the present invention, the inner end of the second connecting rod is fixedly connected to the first connecting plate by means of a fastening screw.

[0013] In the present invention, a positioning shaft is installed at the inner end of the second connecting rod, and a support plate is arranged between the positioning shaft and the third connecting rod. The positioning shaft passes through the support plate and the third connecting rod and is inserted into the inner end of the second connecting rod. The inner end of the third connecting rod is hinged to the inner end of the second connecting rod. The positioning shaft is the hinge shaft of the third connecting rod.

[0014] In the present invention, the first connecting rod is hinged on the first column through a hinge bolt and a nut, the hinge bolt passes through the first connecting rod and the first column and is connected to the nut, and the hinge bolt is the hinge axis of the first connecting rod.

[0015] In the present invention, a second bushing and a positioning bushing are further provided between the hinge bolt and the first connecting rod.

[0016] As a preferred embodiment, an extension arm is horizontally installed on the top of the second column, and the extension arm is perpendicular to the second column. The extension arm is provided with a plurality of mounting holes for installing a fixed pulley along the length direction, which can be suitable for angle adjusters with different adjustment strokes, and the fixed pulley is installed on the mounting hole of the extension arm.

[0017] Compared with the prior art, the present invention has the following significant effects:

[0018] (1) The measuring device of the present invention has a simple structure and utilizes the triangle stability and two-force rod principle to greatly improve the accuracy of measuring the torsional stiffness curve of the angle adjuster.

[0019] (2) The measuring device of the present invention has high versatility and manufacturability, and can be used to measure the torsional stiffness curves of angle adjusters of different models and different strokes. It is easy to assemble, low in cost, and highly practical.

[0020] (3) The measuring device of the present invention is easy to install and store.

[0021] (4) In the measuring device of the present invention, the angle adjuster is fixed to the two connecting plates by welding. For different angle adjusters, only the connecting plates need to be replaced. The device has high versatility and low cost.

[0022] (5) The measuring device of the present invention can facilitate the measurement of the torsional stiffness curve of the angle adjuster with different adjustment strokes by extending the arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a schematic diagram of the installation position of the existing car seat recliner;

[0025] Figure 2 The measurement principle diagram of the device for measuring the torsional stiffness of the car seat recliner of the present invention;

[0026] Figure 3 The overall structure schematic diagram of the device for measuring the torsional stiffness of the car seat recliner of the present invention;

[0027] Figure 4 It is a front view of the device for measuring the torsional stiffness of the car seat recliner of the present invention;

[0028] Figure 5 for Figure 4 A-A sectional view;

[0029] Figure 6 for Figure 5 A magnified view of part E;

[0030] Figure 7 for Figure 5 Magnified view of part F;

[0031] Figure 8 It is a partial exploded view of the device for measuring the torsional stiffness of the car seat recliner of the present invention.

[0032] In the figure: 1. first column, 2. second column, 3. first stabilizing rod, 4. second stabilizing rod, 5. second connecting rod, 6. first connecting plate, 7. second connecting plate, 8. loading cable, 9. extension arm, 10. fixed pulley, 11. second column, 12. loading U-shaped ring, 13. positioning snap ring, 14. third connecting rod, 15. chain, 16. positioning shaft, 17. support plate, 18. first bushing, 19. angle adjuster, 20. nut, 21. second bushing, 22. positioning bushing, 23. hinge bolt. DETAILED DESCRIPTION

[0033] like Figures 1 to 8 The measuring device shown for measuring the torsional stiffness of the car seat recliner includes a first column 1 and a second column 11 which are vertically arranged and located on both sides. A fixed pulley 10 is installed on the top of the second column 11. The first connecting plate 6 and the second connecting plate 7 are fixedly installed on both sides of the recliner 19. The first connecting plate 6 and the second connecting plate 7 are respectively welded to the two sides of the recliner 19. The recliner 19 is fixed to the first connecting plate 6 and the second connecting plate 7 by welding. For different recliners, only the first connecting plate 6 and the second connecting plate 7 need to be replaced. It has high versatility and low cost.

[0034] The second connecting plate 7 is installed at the bottom of the second column 11, and a connecting force rod mechanism is also set up between the first connecting plate 6 and the first column 1. One end of the loading cable 8 is connected to the connecting force rod mechanism, and the other end is connected to the oil cylinder after passing through the fixed pulley 10. The loading cable 8 is pulled by the oil cylinder, and the loading cable 8 drives the connecting force rod mechanism to rotate. When the connecting force rod mechanism rotates, the angle adjuster 19 is driven to twist through the first connecting plate 6, so as to measure the torsional stiffness of the angle adjuster.

[0035] In this embodiment, the connecting rod mechanism includes a first connecting rod 2, a second connecting rod 5, a third connecting rod 14, a first stabilizing rod 3 and a second stabilizing rod 4. The first connecting rod 2 is hinged on the first column 1, the inner end of the second connecting rod 5 is fixedly connected to the first connecting plate 6 by a fastening screw, the inner end of the third connecting rod 14 is hinged to the inner end of the second connecting rod 5, the outer end of the second connecting rod 5 and the outer end of the third connecting rod 14 are respectively hinged to the chain 15, and the chain 15 is perpendicular to the third connecting rod 14, that is, the second connecting rod 5, the third connecting rod 14 and the chain 15 form a right triangle; the first connecting rod 2 and the third connecting rod 14 are arranged in parallel, and the first stabilizing rod 3 and the first stabilizing rod 4 are arranged in parallel. The second stabilizing rod 4 is fixedly welded to the first connecting rod 2 and the third connecting rod 14 by argon arc welding, and both are perpendicular to the first connecting rod 2 and the third connecting rod 14, that is, the first connecting rod 2, the third connecting rod 14, the first stabilizing rod 3 and the second stabilizing rod 4 form a rectangle; the loading steel cable 8 is connected to the second stabilizing rod 4, and the specific connection structure is: a positioning clamp 13 is welded on the second stabilizing rod 4, and a loading U-shaped ring 12 is mounted on the positioning clamp 13, and the loading steel cable 8 is connected to the loading U-shaped ring 12. The loading steel cable 8 is used as a two-force rod for easy storage, and the fixed pulley 10 is used to more accurately determine the real-time tension direction, thereby reducing the measurement error.

[0036] The measuring device utilizes the stability of the triangle and the principle of two-force rods, drives the connecting force rod mechanism to rotate by loading the steel cable 8, and finally applies torque to the recliner through the second connecting rod 5 and the first connecting plate 6 to measure the torsional stiffness of the recliner, and the measuring device can also ensure that the recliner is only subjected to torque when torsion, eliminating the influence of radial force on the torsional stiffness of the recliner. In this embodiment, a positioning shaft 16 is installed at the inner end of the second connecting rod 5, and a support plate 17 is arranged between the positioning shaft 16 and the third connecting rod 14. The positioning shaft 16 passes through the support plate 17 and the third connecting rod 14 and is inserted into the inner end of the second connecting rod 5, and the inner end of the third connecting rod 14 is hinged to the inner end of the second connecting rod 5. The positioning shaft 16 is the hinge shaft of the third connecting rod 14; a first bushing 18 is also arranged between the positioning shaft 16 and the third connecting rod 14. For easy installation, the positioning shaft 16 can be directly welded to the support plate 17.

[0037] Since the chain 15 is a flexible rod and can only withstand axial tension, the chain 15 is perpendicular to the second connecting rod 5, so the second connecting rod 5 only exerts torque on the recliner 19; the third connecting rod 14 is hinged to the support plate 17, and has no connection with the second connecting rod 5 and the recliner 19, so the radial force on the third connecting rod 14 cannot be transmitted to the recliner 19; therefore, the recliner 19 only withstands the torque transmitted by the second connecting rod 5, and has no radial force, thereby eliminating the influence of the radial force on the torsional stiffness of the recliner 19.

[0038] In this embodiment, the first connecting rod 2 is hinged to the first column 1 through a hinge bolt 23 and a nut 20. The hinge bolt 23 passes through the first connecting rod 2 and the first column 1 and is connected to the nut 20. The hinge bolt 23 is the hinge axis of the first connecting rod 2. A second bushing 21 and a positioning bushing 22 are also provided between the hinge bolt 23 and the first connecting rod 2.

[0039] As a preferred embodiment, an extension arm 9 is also horizontally installed on the top of the second column 11. The extension arm 9 is perpendicular to the second column 11. The extension arm 9 is provided with a plurality of mounting holes for installing a fixed pulley 10 along the length direction, which can be suitable for angle adjusters with different adjustment strokes. The fixed pulley 10 is installed on the mounting hole of the extension arm 9.

[0040] The working principle of the measuring device of the present invention is as follows Figure 2 As shown,

[0041] A is the angle adjuster 19, which is fixed on the measuring device.

[0042] E is a fixed pulley 10,

[0043] DE is the loading cable 8 pulled by the oil cylinder,

[0044] ΔABC is the initial position of the right triangle formed by the second connecting rod 5, the third connecting rod 14 and the chain 15 in the connecting rod mechanism, AB⊥BC, and the rods AB, BC and CA are all hinged.

[0045] Among them, AB is the distance between the two hinge points of the second connecting rod 5, BC is the distance between the two hinge points of the chain 15, CA is the distance between the two hinge points of the third connecting rod 14, ΔAB′C′ is the position of the connecting rod mechanism at a certain moment during the pulling process, among which ∠CAE, AE, AB, AC, AD, and DE are known, and the cylinder retraction length (i.e. (DE-D′E)) can be read by the equipment.

[0046] Among them, point A is the rotation center point of the angle adjuster.

[0047] B and C are the hinge points at both ends of the chain.

[0048] Point D is the contact point between the loading U-shaped ring and the second stabilizer bar.

[0049] DG / / BC,

[0050] B', C', D', and G' are the positions of B, C, D, and G after rotation during loading, respectively.

[0051] Point E is the fixed point of the fixed pulley.

[0052] Ignoring the radius of the fixed pulley, arc DF is the maximum travel of the entire motion trajectory of point D.

[0053] AH is the angle bisector of ∠C′AE;

[0054] ∠CAE: the angle between the third link and the line connecting the rotation center of the angle adjuster and the fixed point of the fixed pulley before loading;

[0055] ∠C′AE: after loading, the angle between the third link and the line connecting the rotation center of the angle adjuster and the fixed point of the fixed pulley;

[0056] ∠D′AE: after loading, the angle between the third link and the line connecting the rotation center of the angle adjuster and the fixed point of the fixed pulley;

[0057] ∠AD′E: the angle between the cable D'E and the third link after loading;

[0058] ∠BAB′: the angle of the second connecting rod before and after loading;

[0059] ∠CAC′: the angle of the third link before and after loading;

[0060] ΔD′KL: auxiliary triangle of force, D'K is on the extension line of G'D', and D'L is on D'E.

[0061] AH is the angle bisector of ∠C′AE,

[0062] AE: The distance between the angle adjuster's rotation center and the fixed pulley

[0063] AB: The distance between the two hinge points of the second link

[0064] AC: The distance between the two hinge points of the third link

[0065] AD: The distance from the angle adjuster's rotation center to the U-shaped ring

[0066] DE: Initial length of the cable between the U-shaped ring and the fixed pulley fixed point

[0067] In ΔD′AE, the three sides D′A, AE, and ED′ are known. The law of cosines can be used to find ∠D′AE and ∠AD′E:

[0068]

[0069]

[0070] Recliner Angle:

[0071]

[0072] In the force triangle ΔD′KL, the force F (cylinder tension, i.e. D′L) is known, and ∠D′KL and ∠KD′L can be calculated.

[0073] ∠D′KL=∠G′D′A=∠B′C′A=∠BCA

[0074] ∠D′LK=∠AD′E

[0075] From the sine theorem, we can find F1 (i.e. D′K)

[0076]

[0077]

[0078]

[0079] The loading process is a quasi-static process, so the rod AC′ is in a state of moment equilibrium.

[0080] AD′*F1*sin∠C′D′K=AC′*F C′1 *sin∠B′C′D′

[0081] And because ∠C′D′K and ∠B′C′D′ are alternate interior angles, ∠C′D′K=∠B′C′D′, so

[0082]

[0083] According to the two-force rod principle, F can be calculated B，1 :

[0084] F B′1 =F C′1

[0085] Torsional force F on the angle adjuster B′1 , the real-time torque of the angle adjuster can be obtained:

[0086]

[0087] Combined with the real-time torsion angle ∠BAB′ of the angle adjuster, the torsional stiffness curve of the angle adjuster can be obtained.

[0088] The measuring device of the present invention is highly versatile and reusable, and is suitable for measuring torsional stiffness curves of various types of angle adjusters. The angle adjuster and the parts directly connected thereto can be matched with the tooling to complete the measurement of the torsional stiffness curve of the angle adjuster. In addition, the device is highly manufacturable, easy to assemble, low in cost, and highly practical.

[0089] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. A measuring device for measuring the torsional stiffness of a car seat recliner, characterized in that: The measuring device comprises a first column (1) and a second column (11) which are arranged vertically and located on both sides. A fixed pulley (10) is installed on the top of the second column (11). A first connecting plate (6) and a second connecting plate (7) are fixedly installed on both sides of the angle adjuster (19). The second connecting plate (7) is installed on the bottom of the second column (11). A connecting rod mechanism is also arranged between the first connecting plate (6) and the first column (1). One end of the loading cable (8) is connected to the connecting rod mechanism, and the other end of the loading cable (8) is connected to the oil cylinder after passing through the fixed pulley (10). The loading steel cable (8) is pulled by the oil cylinder, and the loading steel cable (8) drives the connecting force rod mechanism to rotate. When the connecting force rod mechanism rotates, the angle adjuster (19) is driven to twist through the first connecting plate (6), so as to measure the torsional stiffness of the angle adjuster; the connecting force rod mechanism comprises a first connecting rod (2), a second connecting rod (5), a third connecting rod (14), a first stabilizing rod (3) and a second stabilizing rod (4), the first connecting rod (2) is hinged on the first column (1), the inner end of the second connecting rod (5) is fixedly connected to the first connecting plate (6), and the inner end of the third connecting rod (14) is fixedly connected to the first connecting plate (6). The inner end is hinged to the inner end of the second connecting rod (5), the outer end of the second connecting rod (5) and the outer end of the third connecting rod (14) are respectively hinged to the chain (15), and the chain (15) is perpendicular to the third connecting rod (14), that is, the second connecting rod (5), the third connecting rod (14) and the chain (15) form a right triangle; the first connecting rod (2) and the third connecting rod (14) are arranged in parallel, and the first stabilizing rod (3) and the second stabilizing rod (4) are fixedly mounted on the first connecting rod (2) and the third connecting rod (14), and are both connected to the first connecting rod (2) and the third connecting rod (14). 4) are perpendicular to each other, that is, the first connecting rod (2), the third connecting rod (14), the first stabilizing rod (3) and the second stabilizing rod (4) form a rectangle; the loading steel cable (8) is connected to the second stabilizing rod (4); the measuring device utilizes the stability of the triangle and the two-force rod principle to drive the connecting force rod mechanism to rotate through the loading steel cable (8), and finally applies torque to the recliner through the second connecting rod (5) and the first connecting plate (6) to measure the torsional stiffness of the recliner, and the measuring device can also ensure that the recliner is only subjected to torque when torsion, thereby eliminating the influence of radial force on the torsional stiffness of the recliner.

2. The measuring device for measuring the torsional stiffness of a car seat recliner according to claim 1, characterized in that: A positioning clamp ring (13) is welded on the second stabilizing rod (4), a loading U-shaped ring (12) is sleeved on the positioning clamp ring (13), and the loading steel cable (8) is connected to the loading U-shaped ring (12).

3. The measuring device for measuring the torsional stiffness of a car seat recliner according to claim 1, characterized in that: The first stabilizing rod (3) and the second stabilizing rod (4) are fixedly welded to the first connecting rod (2) and the third connecting rod (14) by argon arc welding.

4. The measuring device for measuring the torsional stiffness of a car seat recliner according to claim 1, characterized in that: Two surfaces of the angle adjuster (19) are respectively welded to the first connecting plate (6) and the second connecting plate (7).

5. The measuring device for measuring the torsional stiffness of a car seat recliner according to claim 1, characterized in that: The inner end of the second connecting rod (5) is fixedly connected to the first connecting plate (6) by means of a fastening screw.

6. The measuring device for measuring the torsional stiffness of a car seat recliner according to claim 1, characterized in that: A positioning shaft (16) is installed at the inner end of the second connecting rod (5), and a support plate (17) is provided between the positioning shaft (16) and the third connecting rod (14); the positioning shaft (16) passes through the support plate (17) and the third connecting rod (14) and is inserted into the inner end of the second connecting rod (5); the inner end of the third connecting rod (14) is hinged to the inner end of the second connecting rod (5); the positioning shaft (16) is a hinge shaft of the third connecting rod (14).

7. The measuring device for measuring the torsional stiffness of a car seat recliner according to claim 1, characterized in that: The first connecting rod (2) is hinged to the first column (1) via a hinge bolt (23) and a nut (20); the hinge bolt (23) passes through the first connecting rod (2) and the first column (1) and is connected to the nut (20); the hinge bolt (23) is a hinge axis of the first connecting rod (2).

8. The measuring device for measuring the torsional stiffness of a car seat recliner according to claim 7, characterized in that: A second bushing (21) and a positioning bushing (22) are also provided between the hinge bolt (23) and the first connecting rod (2).

9. The measuring device for measuring the torsional stiffness of a car seat recliner according to any one of claims 1 to 8, characterized in that: An extension arm (9) is also horizontally mounted on the top of the second column (11). The extension arm (9) is perpendicular to the second column (11). The extension arm (9) is provided with a plurality of mounting holes for mounting a fixed pulley (10) along the length direction, and can be suitable for angle adjusters with different adjustment strokes. The fixed pulley (10) is mounted on the mounting hole of the extension arm (9).

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