Tailgate closing force measuring device

Abstract

The present application discloses a tailgate closing force measuring device, which is configured to be used in a trunk of a vehicle, the trunk comprising a trunk frame defining a trunk space and a tailgate capable of opening and closing the trunk space, the tailgate closing force measuring device comprising: a mounting side frame configured to be temporarily mounted to the trunk frame during a test; an extendable push rod assembly pivotally connected to the mounting side frame; a flexible component configured to be connected to the tailgate at one end of the flexible component, and the flexible component can be pulled by the extendable push rod assembly to apply a closing force to the tailgate; and a tension sensor connected to the other end of the flexible component to measure the closing force. The present application provides a tailgate closing force measuring device with controllable force direction and speed and high repeatability.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle parts testing, and more specifically, to a tailgate closing force measuring device. Background Art

[0002] The closing force of a vehicle's tailgate (e.g., electric tailgate) can reflect the quality of the vehicle and is affected by a combination of factors, including but not limited to the matching deviation between the lock and the latch body, the installation deviation of the lock's striker and rubber block, and the selection of the sealing strip. Frequent testing of the tailgate closing force, especially the static closing force of the tailgate, is required at various stages such as vehicle design verification and vehicle durability testing. Only by quantitatively testing the tailgate closing force can engineers have accurate data to measure the combined impact of various factors.

[0003] At present, there are two ways to test the closing force of the tailgate: the operator is behind the tailgate of the vehicle and slowly pushes the tailgate with a thrust gauge until it closes; or the operator sits in the trunk space of the vehicle and slowly pulls the tailgate with a tension gauge until it closes. However, since the closing force of the tailgate of the vehicle needs to be tested repeatedly at each stage, and the tailgate closing force is large (greater than 300N), frequent repeated operations can easily cause fatigue of the operator. Furthermore, since it is a manual operation, it is difficult to keep the force direction and speed constant for different people and at different times, so the repeatability error of the test results is large. Moreover, it is expected that the force direction for closing the tailgate is parallel to the movement direction of the latch body relative to the lock buckle when the tailgate is about to close, but it is almost impossible to manually judge whether the current force direction is parallel to this movement direction, which can easily cause test errors. Summary of the invention

[0004] One object of the present application is to provide a tailgate closing force measuring device with controllable force direction and speed and high repeatability.

[0005] According to a first aspect of the present application, a tailgate closing force measuring device is provided, which is configured to be used in a trunk of a vehicle, the trunk comprising a trunk frame defining a trunk space and a tailgate capable of opening and closing the trunk space, the tailgate closing force measuring device comprising: a mounting side frame configured to be temporarily mounted to the trunk frame during testing; an extendable push rod assembly pivotally connected to the mounting side frame; a flexible member configured to be connected to the tailgate at one end of the flexible member, and the flexible member can be pulled by the extendable push rod assembly to apply a closing force to the tailgate; and a tension sensor connected to the other end of the flexible member to measure the closing force.

[0006] In an optional embodiment, the tailgate closing force measuring device further includes a first pulley assembly pivotably connected to the mounting side frame and fixed to the push rod assembly, and the flexible member is guided via the first pulley assembly to be pulled by the extendable push rod assembly.

[0007] In an optional embodiment, the first pulley assembly is arranged relative to the mounting side frame to prevent the push rod assembly from pivoting relative to the mounting side frame toward the tailgate when the flexible member is guided via the first pulley assembly to be pulled by the extendable push rod assembly.

[0008] In an optional embodiment, the luggage box frame is provided with a lock buckle, the tailgate is provided with a latch body configured to lock on the lock buckle, the one end of the flexible component is connected to the latch body, and the first pulley assembly is arranged relative to the mounting side frame so that when the tailgate is about to be closed, the movement direction of the latch body relative to the lock buckle is parallel to the direction in which the flexible component is guided via the first pulley assembly to apply a closing force to the latch body.

[0009] In an optional embodiment, the lock further comprises a lock assembly, the lock is mounted to the luggage case frame via the lock assembly, and the mounting side frame is configured to be suitable for being temporarily mounted to the lock assembly of the luggage case frame.

[0010] In an optional embodiment, the tailgate closing force measuring device further includes a second pulley assembly, the push rod assembly includes an extendable push rod, and the second pulley assembly is fixed to one end of the push rod, so that the flexible component is switched via the second pulley assembly.

[0011] In an optional embodiment, the other end of the flexible component after the change of direction is connected to a tension sensor, and the tension sensor is fixed to the first pulley assembly.

[0012] In an optional embodiment, the push rod assembly includes a fixed support frame configured to be placed directly on the bottom of the luggage box frame to support the tailgate closing force measuring device in the luggage box space.

[0013] In an alternative embodiment, the push rod assembly is configured to be electronically controlled to maintain the rate at which the push rod assembly extends at a constant value during testing.

[0014] In an alternative embodiment, the push rod assembly can be charged by an on-board charger on the vehicle during operation of the tailgate closing force measuring device.

[0015] The main advantages of the tailgate closing force measuring device provided by the present application are: machine operation replaces manual operation, ensuring the consistency of the force direction and speed during the test of the tailgate closing force; the tailgate closing force measuring device can be placed in the luggage compartment (trunk) of almost any vehicle and remotely controlled, and has wide adaptability; the tailgate closing force measuring device has a simple structure and is easy to install, and does not require the luggage compartment to provide additional supporting components for the tailgate closing force measuring device; and the tailgate closing force measuring device is small in size and light in weight, and does not require additional counterweights to stabilize the position of the tailgate closing force measuring device.

[0016] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0018] Figure 1 is a perspective view of a tailgate closing force measuring device installed in a luggage box and in a working state according to one embodiment of the present application;

[0019] Figure 2 is a perspective view of a tailgate closing force measuring device according to one embodiment of the present application; and

[0020] Figure 3 is another perspective view of a tailgate closing force measuring device according to one embodiment of the present application. DETAILED DESCRIPTION

[0021] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0022] Technologies, methods, devices, and systems known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, devices, and systems should be considered part of the specification.

[0023] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0024] It should also be noted that for the purpose of clarity, for a vehicle with a closed tailgate, the terms "bottom" and "lower" refer to the direction toward the ground in the vertical direction of the vehicle, "top" and "upper" refer to the direction away from the ground in the vertical direction of the vehicle, "rear" refers to the rearward direction in the longitudinal direction of the vehicle, "front" refers to the forward direction in the longitudinal direction of the vehicle, "outer" refers to the direction away from the longitudinal centerline of the vehicle in the transverse direction of the vehicle, and "inner" refers to the direction toward the longitudinal centerline of the vehicle in the transverse direction of the vehicle.

[0025] The vehicle described in the present application may be a fuel vehicle, a pure electric vehicle or a hybrid vehicle, etc., as long as these vehicles have a luggage compartment. The luggage compartment includes a luggage compartment frame and a tailgate. The luggage compartment frame defines a luggage compartment space that can be used to place luggage or other items, and the tailgate is hinged to the luggage compartment frame by a hinge device to allow the tailgate to open and close the luggage compartment space by rotating around the rotation axis of the hinge device. In addition, when the tailgate is closed, the tailgate can also be locked to the luggage compartment frame by a locking device. As long as the function of the tailgate opening and closing the luggage compartment space can be achieved, the hinge device and the locking device can be arranged at different parts of the tailgate and the luggage compartment frame.

[0026] As an example, the hinge device is arranged at the top of the tailgate and the top of the rear edge of the luggage box frame, and the locking device is arranged at the bottom of the tailgate and the bottom of the rear edge of the luggage box frame. Figure 1 As shown, the lock device includes a latch body 2 and a lock catch 6. The latch body 2 is centrally mounted to the bottom of the tailgate and faces the luggage compartment space when the tailgate is about to be closed or closed. Correspondingly, the lock catch 6 is centrally mounted to the rear edge bottom 8 of the luggage compartment frame to cooperate with the latch body 2 to complete the locking when the tailgate is closed. Optionally, the rear edge bottom 8 of the luggage compartment frame is centrally provided with a recess 12 for receiving the lock catch 6. The lock catch 6 includes: a lock catch assembly 16 fixed to the recess 12 by connecting screws, bolts or other connecting parts 7; a striker 18 arranged on the lock catch assembly 16 or integrally formed with the lock catch assembly 16, and the striker 18 is configured to be locked by the latch body 2 when the tailgate is closed. In other words, the latch body 2 is locked on the striker 18 of the lock catch 6, which represents the completion of the closing of the tailgate; a plastic cover (not shown) optionally installed on the lock catch assembly 16; and a rubber block (not shown) optionally arranged on the plastic cover or integrally formed with the plastic cover, and the rubber block is configured to reduce the impact and noise caused by the latch body 2 locking the striker 18 when the tailgate is closed.

[0027] In order to stably arrange the plastic cover on the lock assembly 16, the lock assembly 16 includes an assembly base 20 for receiving the plastic cover. Optionally, the assembly base 20 includes two opposite side panels 22 and a front panel 24 connected to the two side panels 22. The two side panels 22 are respectively provided with a slot 26 to receive the tab of the plastic cover. The front panel 24 is also provided with a mounting hole, and a connecting screw, bolt or other connecting member 25 can be used to mount the plastic cover to the lock assembly 16 via the mounting hole. Therefore, the assembly base 20 has two slots 26 and one mounting hole for mounting the plastic cover, that is, a total of three mounting locations.

[0028] Reference Figure 2 and Figure 3 The tailgate closing force measuring device 30 provided by the present application can be used, but not limited to, to test the closing force of the above-mentioned tailgate (e.g., electric tailgate), especially the static closing force of the tailgate, and the tailgate closing force measuring device 30 according to the embodiment of the present application will be described below. It should be noted that the following description is for the tailgate closing force measuring device 30 installed in the luggage compartment and in a working state, and at this time the tailgate is about to be closed or has been closed. It can be understood that the tailgate closing force measuring device 30 provided by the present application can also be used to test other types of tailgates.

[0029] The tailgate closing force measuring device 30 provided in the present application includes a mounting side frame 32, which is configured to be temporarily mounted to the trunk frame of the vehicle during the test of the tailgate closing force when the plastic cover has not been mounted to the latch assembly 16 or has been removed from the latch assembly 16. The mounting side frame 32 includes a first mounting member 34 and a second mounting member 36 connected to each other, and the first mounting member 34 is configured to be temporarily mounted to the assembly base 20 of the latch assembly 16 as described above during the test of the tailgate closing force to assist in fixing the tailgate closing force measuring device 30 relative to the trunk frame.

[0030] In an optional embodiment, the first mounting member 34 of the mounting side frame 32 includes a substantially U-shaped bent plate having a substantially flat first portion 40 and two second portions 42 extending substantially perpendicularly to the first portion 40 from both ends of the first portion 40. The shape defined by the first portion 40 and the two second portions 42 matches the shape of the assembly base 20, so that the first mounting member 34 can be sleeved on the assembly base 20 of the lock assembly 16. The first portion 40 is centrally provided with a first positioning hole, the first positioning hole is configured to align with the mounting hole of the front plate 24 of the assembly base 20, and the connecting screw, bolt or other connecting member 25 can be used to mount the mounting side frame 32 to the assembly base 20 via the first positioning hole and the mounting hole. In addition, the two second portions 42 are respectively provided with second positioning holes on surfaces facing each other, the second positioning holes are configured to align with the card slots 26 of the side plates 22 of the assembly base 20, so that the card block 44 can be installed via the second positioning hole and the corresponding card slot 26. Thus, by using the three mounting locations of the mounting base 20 for mounting the plastic cover when the plastic cover has not been mounted to the mounting base 20 or has been removed from the mounting base 20, the first mounting member 34 of the mounting side frame 32 is temporarily mounted to the trunk frame, which can ensure stability and avoid providing additional accessories to the trunk frame specifically for mounting the tailgate closing force measuring device 30. If the test conditions permit, the first mounting member 34 of the mounting side frame 32 can also be mounted to the mounting base 20 only at at least one of the three mounting locations.

[0031] It is understood that the first mounting member 34 can also be mounted to other suitable locations of the buckle assembly 16, especially without a plastic cover and possibly without a mounting base. In fact, the mounting side frame 32 is configured to be suitable for temporary mounting to the buckle assembly 16 of the luggage case frame.

[0032] The tailgate closing force measuring device 30 also includes a push rod assembly 50 pivotally connected to the mounting side frame 32, for example, the push rod assembly 50 includes: a first end 52; a second end 54; a push rod housing 56 extending from the first end 52 to the second end 54; and a lead screw (not shown) and a push rod 58 accommodated in the push rod housing 56, one end of the push rod 58 is at least partially threadedly connected to the lead screw, so that rotation of the lead screw can cause the other end 59 of the push rod 58 to extend from or retract into the push rod housing 56, so that the push rod assembly 50 (in other words, the push rod 58) is extendable.

[0033] The tailgate closing force measuring device 30 further includes a flexible member 60 that can be pulled by the extendable push rod assembly 50 to apply a closing force to the tailgate. The flexible member 60 is configured to be connected to the tailgate at one end 62 of the flexible member 60. For example, as described above, the latch body 2 is centrally mounted to the bottom of the tailgate by connecting screws, bolts or other connecting members 7. In order to test the tailgate closing force, a string 9 can be used to tie the connectable portion of the latch body 2, such as those connecting screws, bolts or other connecting members 63, so that the string 9 forms a hookable loop, and then a hook 65 is provided at the one end 62 of the flexible member 60, and the loop is hooked by the hook 65. In this way, when the push rod assembly 50 is extended, the flexible member 60 is pulled forward by the push rod assembly 50, and due to the connection between the loop and the hook 65, the latch body 2 and thus the tailgate are also pulled forward at the same time until the tailgate is closed. It is understandable that the one end 62 of the flexible component 60 may be connected to the tailgate in any other suitable manner, for example, a hook is provided on the latch body 2 and a ring is provided on the flexible component 60 .

[0034] The tailgate closing force measuring device 30 further includes a tension sensor 70, which is connected to the other end 64 of the flexible component 60 to measure the tension of the flexible component 60, thereby determining the closing force of the tailgate. Optionally, the flexible component 60 includes a flexible wire, or any other component that can be connected to the latch body 2 and is suitable for the tension sensor 70 to measure the tension. The tension sensor 70 can transmit the measured tension to the controller of the tension sensor 70 in an appropriate manner, and the controller of the tension sensor 70 can display the measurement result to the operator.

[0035] The tailgate closing force measuring device 30 further includes a first pulley assembly 75, which is pivotally connected to the mounting side frame 32 and fixed to the push rod assembly 50, and the flexible member 60 can be guided via the first pulley assembly 75 to be pulled by the extendable push rod assembly 50. The first pulley assembly 75 includes: a first pulley bracket 78 provided with a first rotation pin 76; and a first pulley 80 mounted to the first rotation pin 76 to be rotatable relative to the first pulley bracket 78, the first pulley 80 having a first groove on its periphery to at least partially receive and guide the movable flexible member 60, and the flexible member 60 can then be pulled by the extendable push rod assembly 50. For example, the first rotation pin 76 is pivotally mounted to the second mounting member 36 of the mounting side frame 32 so that the first pulley assembly 75 and thus the push rod assembly 50 can pivot at an appropriate angle relative to the mounting side frame 32.

[0036] In an optional embodiment, the push rod assembly 50 further includes a second pulley assembly 85, which is fixed to the other end 59 of the push rod 58 to move with the push rod 58. The second pulley assembly 85 includes: a second pulley bracket 88 provided with a second rotation pin 86 and a third rotation pin 87; and a second pulley 90 and a third pulley 92 respectively mounted to the second and third rotation pins 86, 87 to be rotatable relative to the second pulley bracket 88, and the peripheries of the second and third pulleys 90, 92 respectively have a second groove and a third groove to at least partially receive and guide the movable flexible member 60. In this case, the flexible member 60 can be pulled by the extended push rod assembly 50 and reversed via the second pulley assembly 85. The other end 64 of the reversed flexible member 60 is connected to the tension sensor 70, and the tension sensor 70 is fixed to the first pulley assembly 75 so that one end 62 of the flexible member 60 is relatively adjacent to the other end 64 of the flexible member 60. Thus, the second pulley assembly 85 can increase the working length of the flexible member 60. For example, when the push rod 58 is extended by an additional length L, the flexible member 60 will be pulled forward by a length of 2L. It can be understood that the second pulley assembly 85 can also be arranged in other ways, for example, the second pulley assembly 85 has only one pulley or more than two pulleys, as long as the second pulley assembly 85 can assist the flexible member 60 in reversing to increase the working length of the flexible member 60.

[0037] In an optional embodiment, the second end 54 is provided with a fixed support frame 90, which is configured to be directly placed on the bottom of the trunk frame to support the tailgate closing force measuring device 30 in the trunk space. For example, the fixed support frame 90 can be a generally L-shaped bent plate having a first section 92 configured to abut against the bottom of the trunk frame and a first section 94 extending perpendicular to the first section 92, and the first section 94 has corresponding through holes to allow the flexible member 60 and the push rod 58 to pass through. It can be understood that the fixed support frame 90 can also be formed in any other suitable manner, for example, the fixed support frame 90 is formed on the push rod housing 56 instead of necessarily on the second end 54. For another example, the length of the fixed support frame 90 in the vertical direction is adjustable so that the fixed support frame 90 can be placed in the trunk space in the best orientation, or the vertical spacing of the bottom of the trunk frame relative to the push rod housing 56 can be changed by adjusting the length of the fixed support frame 90 in order to adapt to the trunks of different types of vehicles. As another example, instead of the first section 92 , the fixed support frame 90 has feet that rest on the bottom of the luggage case frame, and so on.

[0038] In an optional embodiment, the push rod assembly 50 is an electric push rod assembly, and therefore includes a motor 92 and a motor controller (not shown), which can be integrally or separately arranged at the first end 52 and optionally located near the push rod housing 56. The motor 92 can drive the lead screw to rotate, and the motor controller can adjust the voltage and current direction output by the motor 92 to change the speed and direction of the lead screw rotation, thereby causing the push rod assembly 50 to extend or retract.

[0039] In an optional embodiment, the tailgate closing force measuring device 30, in particular the push rod assembly 50, can be remotely controlled by a remote control assembly, which includes a remote control with a signal transmitter held by an operator and a signal receiver arranged in a motor controller. The operator sends signals such as "forward", "backward" and "speed" related to the control command of the push rod 58 to the signal receiver in the motor controller through the signal transmitter, and the signal is, for example, an infrared signal, a radio signal, etc. The motor controller then adjusts the voltage and current direction output by the motor 92 according to the signal received by the signal receiver to cause the push rod assembly 50 to perform a corresponding action (extend or retract). Therefore, the operator does not have to sit in the trunk space of the vehicle to complete the measurement, and can use the remote control assembly to set the extension speed of the push rod assembly 50 to a constant value, for example, a smaller constant value, to control the push rod 58 to extend at a certain constant speed, thereby ensuring the consistency of the force application speed. Alternatively or additionally, the tailgate closing force measuring device 30 can also be electrically controlled by a switch connected by a cable to keep the extension speed of the push rod assembly 50 at a constant value during the test.

[0040] In an optional embodiment, since the push rod assembly 50 is small in size and light in weight, the driving power does not need to be too large, so the push rod assembly 50 can be powered by a battery and / or can be charged by an on-board charger on the vehicle during operation of the tailgate closing force measuring device 30.

[0041] The working process of the tailgate closing measurement device provided in this application is roughly as follows:

[0042] Open the tailgate;

[0043] A tailgate closing measurement device is provided, wherein the push rod 58 of the push rod assembly 50 is retracted into the push rod housing 56;

[0044] The tailgate closing measuring device is temporarily fixed to the trunk frame by installing the side frame 32, and the rest of the tailgate closing measuring device is placed on the bottom of the trunk frame. Optionally, the tailgate closing measuring device can be supported by the support frame 90 in the trunk space by making the fixed support frame 90 abut against the bottom of the trunk frame.

[0045] The operator rotates the tailgate from outside the vehicle so that the tailgate is located before the closing position, and connects one end 62 of the flexible member 60 to the latch body 2 of the tailgate;

[0046] Sending a signal to the push rod assembly 50 through a remote controller held by an operator to control the push rod 58 to extend at a certain constant speed, so that the flexible member 60 is optionally guided via the first pulley assembly 75 to be pulled by the extendable push rod assembly 50; and

[0047] The other end of the flexible component 60 is connected to the tension sensor 70. Since the flexible component 60 moves only via fixed pulleys such as the first, second and third pulleys, the fixed pulleys only change the direction of the tension of the flexible component 60 but do not change the magnitude of the tension of the flexible component 60. Therefore, the tension of the flexible component 60 measured by the tension sensor 70 is almost equal to the tailgate closing force.

[0048] Furthermore, to open the tailgate again, the remote controller held by the operator only needs to send a signal to the push rod assembly 50 before unlocking to cause the push rod 58 to retract into the push rod housing 56. Alternatively, the push rod 58 may be configured to automatically retract into the push rod housing 56 after the tension sensor 70 measures the tailgate closing force, that is, after the latch body 2 has been locked on the lock catch 6. For example, the motor controller may be configured to adjust the voltage output by the motor 92 or commutate the current output by the motor 92 when it is determined that the latch body 2 has been locked on the lock catch 6 or the tension sensor 70 transmits the value of the tailgate closing force to the controller of the tension sensor 70, so that the push rod 58 automatically retracts into the push rod housing 56.

[0049] In an optional embodiment, the first pulley assembly 75 is arranged relative to the mounting side frame 32 so that when the tailgate is about to be closed, the movement direction of the latch body 2 relative to the lock catch 6 is parallel to the direction in which the flexible member 60 is guided via the first pulley assembly 75 to apply a closing force to the latch body 2. The direction in which the flexible member 60 applies the closing force is determined by the first rotating pin 76 of the first pulley 80 of the first pulley assembly 75 and the connection position between the flexible member 60 and the latch body 2. Since the fixed pulley changes the direction of the force but not the magnitude of the force, in this case, no matter how the push rod assembly 50 moves, the direction of the force applied by the flexible member 60 to close the tailgate remains unchanged. In this way, the consistency of the force direction in each tailgate closing force measurement or test can be ensured.

[0050] In an optional embodiment, the first pulley assembly 75 is arranged relative to the mounting side frame 32 to prevent the push rod assembly 50 from pivoting relative to the mounting side frame 32 toward the tailgate when the flexible member 60 is guided via the first pulley assembly 75 to be pulled by the extendable push rod assembly 50. For example, the flexible member 60 is guided via the first pulley assembly 75 from below to pull the tailgate forward, in which case the end of the flexible member 60 connected to the tailgate is slightly bent upward at an angle relative to the longitudinal direction of the vehicle, and at the same time, the tailgate applies a force slightly upward at an angle relative to the longitudinal direction of the vehicle to the first rotation pin 76 of the first pulley 80 via the flexible member 60, and the force does not cause the push rod assembly 50 to pivot relative to the mounting side frame 32 toward the tailgate around the first rotation pin 76, and in fact, the torque generated by the force causes the push rod assembly 50 to have a tendency to pivot relative to the mounting side frame away from the tailgate around the first rotation pin 76. Therefore, the remaining arrangement of the tailgate closing force measuring device 30 except for the mounting side frame 32 can be directly placed in the luggage compartment space, thereby eliminating the need for additional installation and saving manpower.

[0051] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are only for illustration and not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A tailgate closing force measuring device, which is configured to be used in a trunk of a vehicle, the trunk comprising a trunk frame defining a trunk space and a tailgate capable of opening and closing the trunk space, the tailgate closing force measuring device comprising: mounting side frames (32) configured to be temporarily mounted to the luggage compartment frame during testing; a first pulley assembly (75) including a rotation pin (76) and a pulley (80) rotatably mounted to the rotation pin (76), the rotation pin (76) being pivotally mounted to the mounting side frame (32) so that the first pulley assembly (75) is pivotally connected to the mounting side frame (32); an extendable push rod assembly (50) secured to the first pulley assembly (75) and thereby pivotally connected to the mounting side frame (32); A flexible member (60) configured to be connected to the tailgate at one end of the flexible member (60), and the flexible member (60) can be guided from below the pulley (80) via the pulley (80) to be pulled by the push rod assembly (50) to apply a closing force to the tailgate; as well as A tension sensor (70) is connected to the other end of the flexible member to measure the closing force.

2. The tailgate closing force measuring device according to claim 1, wherein: The first pulley assembly is disposed relative to the mounting side frame to prevent the push rod assembly from pivoting relative to the mounting side frame toward the tailgate when the flexible member is guided via the pulley from below the pulley to be pulled by the push rod assembly.

3. The tailgate closing force measuring device according to claim 1 or 2, wherein: The luggage box frame is provided with a lock buckle, the tailgate is provided with a latch body configured to be locked on the lock buckle, the one end of the flexible component is connected to the latch body, and the first pulley assembly is arranged relative to the mounting side frame so that when the tailgate is about to be closed, the movement direction of the latch body relative to the lock buckle is parallel to the direction in which the flexible component is guided from below the pulley via the pulley to apply a closing force to the latch body.

4. The tailgate closing force measuring device according to claim 3, wherein: The lock further includes a lock assembly, through which the lock is mounted to the luggage case frame, and the mounting side frame is configured to be temporarily mounted to the lock assembly of the luggage case frame.

5. The tailgate closing force measuring device according to claim 1 or 2, further comprising a second pulley assembly, the push rod assembly comprising an extendable push rod, and the second pulley assembly is fixed to one end of the push rod, so that the flexible component is switched via the second pulley assembly.

6. The tailgate closing force measuring device according to claim 5, wherein: The other end of the reversed flexible member is connected to a tension sensor, and the tension sensor is fixed to the first pulley assembly.

7. The tailgate closing force measuring device according to claim 1 or 2, wherein: The push rod assembly includes a fixed support frame configured to be placed directly on the bottom of the trunk frame to support the tailgate closing force measurement device in the trunk space.

8. The tailgate closing force measuring device according to claim 1 or 2, wherein: The push rod assembly is configured to be electronically controlled to maintain the rate at which the push rod assembly extends at a constant value during testing.

9. The tailgate closing force measuring device according to claim 8, wherein: The push rod assembly can be charged during operation of the tailgate closing force measuring device via an on-board charger on the vehicle.

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