Device for measuring vertical rigidity of hinged door

Abstract

The utility model relates to testing of mechanical parts, and discloses a device for measuring the vertical rigidity of a hinged door, the measuring device is applied to the hinged door, the hinged door is rotationally connected with a vehicle body frame, and the measuring device can comprise a fixed platform, a rigid stand column, a dynamic loading device and a lock cylinder clamp. The rigid stand column is installed on the fixed platform and used for fixing a vehicle body frame, the bottom of the dynamic loading device is installed on the fixed platform, the dynamic loading device is used for generating preloading force and loading force on the hinged door, and the lock cylinder clamp is installed at the end of the dynamic loading device and used for being connected with the dynamic loading device and a door lock of the hinged door. According to the scheme, the vehicle body frame is firmly fixed by means of the rigid stand column, the hinged door is directly installed on the vehicle body frame to restore the vehicle environment, and due to the fact that the vehicle body frame is lifted up by the rigid stand column, enough space is provided for installing the dynamic loading device and the lock cylinder clamp in the measuring process.

Description

TECHNICAL FIELD

[0001] The present application relates to the test of mechanical components, in particular to a measuring device for vertical stiffness of a hinged door. BACKGROUND

[0002] In the vertical stiffness test of an automobile door, the traditional test method is to fix the door by using a tooling fixture and load the load by using a loading mechanism installed on the door. This test device and method can test the vertical stiffness of the door to a certain extent, but due to the different installation methods of the tooling fixture and the door in the actual vehicle, the stiffness obtained by the test and the stiffness of the door in the actual vehicle have certain differences, which is reflected in the large difference between the deformation on the test machine and the deformation that may occur in the actual vehicle.

[0003] When the door is fixed by using the tooling fixture, the installation state of the door in the actual vehicle cannot be truly restored, and the stiffness of the tooling fixture is different from the stiffness of the vehicle body, which leads to deviation in the test results, and a measuring method that can accurately simulate the installation state of the door in the actual vehicle needs to be found. SUMMARY

[0004] The technical problem to be solved by the present application is that the vertical stiffness test of an automobile door has a large deviation from the actual use environment.

[0005] In order to solve the above technical problem, the present application provides a measuring device for vertical stiffness of a hinged door, which is applied to the hinged door, the hinged door is rotationally connected with a vehicle body frame, and the measuring device comprises: a fixed platform; a rigid column, which is installed on the fixed platform and is used for fixing the vehicle body frame; a dynamic loading device, which is installed at the bottom of the fixed platform and is used for generating a preloading force and a loading force on the hinged door; and a lock core clamp, which is installed at the end of the dynamic loading device and is used for connecting the dynamic loading device and a door lock of the hinged door.

[0006] In an embodiment, the measuring device further comprises a lead screw, one end of the lead screw is connected with a door frame of the vehicle body frame, and the other end of the lead screw extends into a buffer rubber plug mounting hole of the hinged door, and the lead screw is used for adjusting and maintaining the opening angle of the hinged door.

[0007] In another embodiment, the measuring device further comprises a fixed column, a mounting bracket, a displacement sensor and a mass block; the displacement sensor comprises a base body and a guide rod, the guide rod slides in the base body, the guide rod is vertically in contact with the upper surface of the mass block, and the mass block is fixedly connected with the hinged door; the bottom of the fixed column is fixedly connected with the fixed platform, and the base body is fixed to the top of the fixed column through the mounting bracket; when the dynamic loading device deforms the hinged door, the hinged door drives the mass block to move upward, and the mass block drives the guide rod to move upward relative to the base body.

[0008] In an embodiment, the displacement sensor further comprises a potentiometer connected between the guide rod and the base, when the guide rod is displaced relative to the base, the potentiometer is driven to change the resistance value of the potentiometer, and the resistance value is used to analyze the displacement of the hinged door.

[0009] In another embodiment, the measuring device further comprises a pressure sensor installed between the dynamic loading device and the lock core clamp.

[0010] In still another embodiment, the top of the dynamic loading device is provided with a connecting head for adjusting the angle between the lock core clamp and the dynamic loading device.

[0011] In an embodiment, the dynamic loading device is an electric cylinder.

[0012] In yet another embodiment, the value of the preload force is one fourth of the value of the loading force.

[0013] In another embodiment, the measuring device further comprises a stepper motor in driving connection with the lead screw, and the stepper motor is used to adjust the length of the lead screw.

[0014] In still another embodiment, the vehicle body frame is a body-in-white or a complete vehicle.

[0015] Compared with the prior art, the measuring device for the vertical stiffness of a hinged door has the following beneficial effects:

[0016] In the measuring device for the vertical stiffness of a hinged door, the hinged door is directly installed on the vehicle body frame, and the force acting on the hinged door is more consistent with the actual use environment because no tooling clamp is used but the vehicle body frame. Meanwhile, the lock core clamp is used to cleverly apply the loading force to the door lock structure of the hinged door, and the door lock is the connection point between another door and the vehicle in the actual vehicle, so the force acting on the hinged door is further more consistent with the actual assembly environment. The dynamic loading device can generate a preload force and a loading force, and compared with a single load, the dynamic loading device can simulate more force states, and compared with a single load, the vertical stiffness of the hinged door can be more comprehensively tested. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a measuring device for the vertical stiffness of a hinged door according to an embodiment of the present application.

[0018] Figure 2 FIG. 2 is a structural schematic diagram of an installation bracket and a displacement sensor according to an embodiment of the present application.

[0019] Figure 3 FIG. 3 is a structural schematic diagram of a dynamic loading device according to an embodiment of the present application.

[0020] REFERENCE SIGNS:

[0021] 1. measuring device, 2. hinged door, 3. vehicle body frame, 10. fixed platform, 11. rigid column, 12. dynamic loading device, 121. connecting head, 13. lock core clamp, 14. screw rod, 15. fixed column, 16. mounting bracket, 17. displacement sensor, 171. base body, 172. guide rod, 18. mass block, 19. pressure sensor. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0023] The vertical stiffness of the automobile door is crucial, which is directly related to the safety, sealing and overall driving experience of the vehicle. During vehicle driving, the door needs to withstand various external forces, such as the pressure when passengers get on and off the vehicle, the impact force transmitted by the road bumps, etc. If the vertical stiffness of the door is insufficient, it may cause the door to deform, affect the normal opening and closing of the door, and even damage the sealing of the vehicle and reduce the sound insulation effect. More seriously, in the event of a collision, the vertical stiffness of the door plays a key role in ensuring the safety of the people inside the vehicle.

[0024] In order to ensure that the automobile door has sufficient vertical stiffness, the test mode used in the past is: the door is fixed by means of a tool clamp, and on the side of the door hanging in the air, an adjustable height loading mechanism is placed on a rigid support to perform the load loading operation. The tool clamp of the door in this test device and the assembly structure of the door in the actual vehicle have a large gap. When the tool clamp is used to fix the door, it is difficult to faithfully reproduce the installation situation of the door in the actual vehicle, and the stiffness of the tool clamp and the stiffness of the vehicle body are different, which cannot reflect the stiffness performance of the door in the actual vehicle.

[0025] Therefore, it is urgent to explore a fixing means that can accurately simulate the installation state of the door in the actual vehicle.

[0026] In this regard, as Figure 1 shown, a measuring device 1 for vertical stiffness of a hinged door 2 according to an embodiment of the present application, the measuring device 1 is applied to the hinged door 2, the hinged door 2 is rotationally connected with a vehicle body frame 3, and the measuring device 1 can include: a fixed platform 10, a rigid column 11, a dynamic loading device 12, and a lock core clamp 13.

[0027] The rigid column 11 is installed on the fixed platform 10, and the rigid column 11 is used to fix the vehicle body frame 3. The bottom of the dynamic loading device 12 is installed on the fixed platform 10, and the dynamic loading device 12 is used to generate a preload and a loading force on the hinged door 2. The lock core clamp 13 is installed at the end of the dynamic loading device 12, and is used to connect the door lock of the dynamic loading device 12 and the hinged door 2.

[0028] By means of the above-mentioned scheme, the vehicle body frame 3 is firmly fixed by means of the rigid upright column 11, and the hinged door 2 is directly installed on the vehicle body frame 3 to reproduce the real vehicle environment. Since the vehicle body frame 3 is lifted by the rigid upright column 11, there is sufficient space to install the dynamic loading device 12 and the lock core clamp 13 during the measurement process.

[0029] Since the dynamic loading device 12 can generate a preloading force and a loading force, this is in sharp contrast to the traditional single load loading method. In the actual vehicle operation process, the force borne by the hinged door 2 is not a single load that remains unchanged, but a complex dynamic force.

[0030] The dynamic loading device 12 can simulate a variety of different force states, such as the alternating stress generated by the periodic impact load borne by the hinged door 2 when the vehicle is driving on different road conditions. By simulating these complex force conditions, the vertical stiffness performance of the hinged door 2 under various actual working conditions can be more comprehensively tested.

[0031] During the test process, potential problems that may occur to the hinged door 2 under different force states, such as fatigue cracks and local deformation, can be found. Through the early discovery and analysis of these problems, the automobile manufacturer can optimize the design and manufacturing process of the hinged door 2, and improve the product quality and reliability.

[0032] At the same time, comprehensive force testing also provides more abundant and accurate data support for the safety performance evaluation of the vehicle, which helps to improve the safety performance of the entire vehicle.

[0033] In any embodiment of the present application, the vehicle body frame 3 can be a body-in-white or a whole vehicle. The body-in-white or the whole vehicle body frame 3 is the same as the real vehicle, and can be freely selected according to the test stage and test cost.

[0034] In an embodiment of the present application, as shown in Figure 1 The measuring device 1 can further include a lead screw 14, one end of the lead screw 14 being connected with the door frame of the vehicle body frame 3, and the other end of the lead screw 14 extending into the buffer rubber plug mounting hole of the hinged door 2. The lead screw 14 is used to adjust and maintain the opening angle of the hinged door 2.

[0035] Compared with relying only on the hinges of the hinged door 2 to maintain the open state of the hinged door 2, the support of the lead screw 14 can better resist the interference of external factors on the position of the hinged door 2. For example, in the case of wind blowing or slight shaking of the vehicle, the lead screw 14 can ensure that the hinged door 2 remains at a specific opening angle and does not swing randomly. This stability is very important for the test work of the hinged door 2, and provides a reliable basic platform for the installation of the test equipment and the measurement operation.

[0036] Meanwhile, the length of the screw rod 14 can be adjusted, and the opening angle of the hinged door 2 can be accurately controlled by adjusting the length of the screw rod 14. During the test of the hinged door 2, different test items can require the hinged door 2 to be at different opening angles.

[0037] For example, when the hinged door 2 needs to be opened to a specific angle, the force on the hinged door 2 at different opening angles in actual use can be accurately simulated. Using the screw rod 14 support, the staff can conveniently adjust the hinged door 2 to the required accurate angle, and keep the angle unchanged during the test, so that the test result is more accurate and reliable.

[0038] It can be understood that the adjustment of the screw rod 14 can be in a manual manner or in an automatic manner. In an embodiment, a stepper motor can be used to drive the screw rod 14 to electrically adjust the length of the screw rod 14, and thus adjust the opening and closing angle of the hinged door 2. In order to quickly and accurately adjust the opening and closing angle of the hinged door 2 relative to the vehicle body frame 3 during the experiment.

[0039] In another embodiment of the present application, as shown in Figure 1 and 2 The measuring device 1 can further include a fixed column 15, a mounting bracket 16, a displacement sensor 17, and a mass block 18.

[0040] The displacement sensor 17 can include a base body 171 and a guide rod 172 sliding in the base body 171, the guide rod 172 vertically abutting against the upper surface of the mass block 18, and the mass block 18 being fixedly connected with the hinged door 2. The bottom of the fixed column 15 is fixedly connected with the fixed platform 10, and the base body 171 is fixed to the top of the fixed column 15 through the mounting bracket 16. When the dynamic loading device 12 deforms the hinged door 2, the hinged door 2 drives the mass block 18 to move upward, and the mass block 18 drives the guide rod 172 to displace upward relative to the base body 171.

[0041] Through the above scheme, the displacement of the hinged door 2 without a planar structure is converted into the displacement of the mass block 18 by means of the mass block 18, and then the guide rod 172 is abutted to realize the measurement of the displacement.

[0042] Since the guide rod 172 can slide relative to the base body 171, compared with the infrared displacement sensor 17, whether the hinged door 2 has displacement or deformation can be observed by naked eye.

[0043] If further marks are made on the guide rod 172, it can be quickly observed whether the displacement of the deformation of the hinged door 2 under the current load meets the design requirements, and the experimental verification can be quickly completed.

[0044] As recorded in the embodiments of the present application, the dynamic loading device 12 makes the test in the present application comprehensive, facilitates the analysis of the data, and in another embodiment of the present application, the displacement sensor 17 can further include a potentiometer connected between the guide rod 172 and the base body 171. When the guide rod 172 is displaced relative to the base body 171, the potentiometer is driven to change the resistance value of the potentiometer, and the resistance value is used to analyze the displacement of the hinged door 2.

[0045] Since the resistance value change of the potentiometer is mainly affected by the displacement factor, it does not affect the observation of the tester, and the data can be recorded synchronously to facilitate subsequent analysis.

[0046] In another embodiment of the present application, as shown in Figure 3 The measuring device 1 can further include a pressure sensor 19 installed between the dynamic loading device 12 and the lock core clamp 13.

[0047] The pressure sensor 19 is used to collect the actual load generated by the dynamic loading device 12, so as to record or verify the load applied by the dynamic loading device 12 on the door lock device of the hinged door 2.

[0048] In an embodiment of the present application, the top of the dynamic loading device 12 is further provided with a connecting head 121, and the connecting head 121 is used to adjust the angle between the lock core clamp 13 and the dynamic loading device 12.

[0049] It can be understood that the connecting head 121 and the lock core clamp 13 can be connected by bolts and nuts or other fastening means. When adjustment is needed, the load is released, the assembly of the connecting head 121 and the lock core clamp 13 is loosened, the angle is adjusted, and then locked for load testing. Through the connecting head 121, the lock core clamp 13 is more flexible and can adapt to the test requirements of different vehicle models.

[0050] In another embodiment of the present application, the dynamic loading device 12 can be an electric cylinder. The electric cylinder can flexibly adjust the pre-load force and the load force output according to the actual demand with the help of a precise control system, and highly restores the actual stress condition.

[0051] The electric cylinder can quickly change the direction and size of the load force, generate alternating stress, and comprehensively cover various stress scenarios of the vehicle door in actual use, thereby enriching the simulation of the stress state of the vehicle door.

[0052] The loading precision of the electric cylinder is much higher than that of traditional loading methods such as hydraulic pressure, and the electric cylinder can output the set force value within a very small error range, thereby ensuring the consistency of each measurement. This makes it possible to accurately find potential problems of the hinged door 2 under different stress states, such as subtle fatigue cracks.

[0053] In any embodiment of the present application, the value of the pre-load force is one quarter of the value of the load force.

[0054] Preload force can make the hinged door 2 in a specific initial stress state before the formal loading test. This helps to eliminate the gap and slack between the components, and simulates the tight combination state of the vehicle door in actual assembly and use. For example, during vehicle driving, the door components are not completely loose, but work cooperatively under the action of a certain preload. The electric cylinder applies the preload, which can make the measurement environment closer to the real situation, avoid measurement errors caused by initial state differences, and provide a more reliable basis for subsequent accurate measurement of vertical stiffness.

[0055] The hinged door 2 vertical stiffness measuring device 1 of the embodiment of the present application provides an innovative solution. The device directly installs the hinged door 2 on the vehicle body frame 3, discards the tool fixture, and makes the force on the hinged door 2 more in line with the actual use environment. At the same time, by using the lock core fixture 13, the loading force is cleverly applied to the door lock structure of the hinged door 2. Since the door lock is the key part of another door and the vehicle in the actual vehicle, this further makes the force on the hinged door 2 fit the actual assembly environment. In addition, the dynamic loading device 12 equipped with the device can generate preload and loading force, compared with the traditional single load loading method, it can simulate more stress states, so as to more comprehensively test the vertical stiffness of the hinged door 2, and effectively make up for the shortcomings of the existing test device and method.

[0056] The above is only the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A device for measuring the vertical stiffness of a hinged door, characterized in that, The measuring device (1) is applied to a hinged door (2) which is rotationally connected with a vehicle body frame (3), and comprises: a fixed platform (10); a rigid column (11) mounted on the fixed platform (10) and used for fixing the vehicle body frame (3); a dynamic loading device (12) mounted at the bottom of the fixed platform (10) and used for generating a pre-load force and a load force on the hinged door (2); a lock core clamp (13) mounted at the end of the dynamic loading device (12) and used for connecting the dynamic loading device (12) and a door lock of the hinged door (2).

2. The measuring device of claim 1, wherein, The measuring device (1) further comprises a lead screw (14) which is connected at one end with a door frame of the vehicle body frame (3) and extends at the other end into a buffer rubber mounting hole of the hinged door (2), and is used for adjusting and maintaining an opening angle of the hinged door (2).

3. The measuring device of claim 1, wherein, The measuring device (1) further comprises a fixed column (15), a mounting bracket (16), a displacement sensor (17) and a mass block (18); the displacement sensor (17) comprises a base body (171) and a guide rod (172) which is slidingly arranged in the base body (171) and vertically abuts against an upper surface of the mass block (18) which is fixedly connected with the hinged door (2); a bottom of the fixed column (15) is fixedly connected with the fixed platform (10), and the base body (171) is fixed to a top of the fixed column (15) through the mounting bracket (16); when the dynamic loading device (12) deforms the hinged door (2), the hinged door (2) drives the mass block (18) to move upward, and the mass block (18) drives the guide rod (172) to displace upward relative to the base body (171).

4. The measuring device of claim 3, wherein, The displacement sensor (17) further comprises a potentiometer which is connected between the guide rod (172) and the base body (171), and when the guide rod (172) displaces relative to the base body (171), the potentiometer is driven to change a resistance value of the potentiometer, and the resistance value is used for analyzing displacement of the hinged door (2).

5. The measuring device of claim 1, wherein, The measuring device (1) further comprises a pressure sensor (19) which is mounted between the dynamic loading device (12) and the lock core clamp (13).

6. The measuring device of claim 1, wherein, A top of the dynamic loading device (12) is provided with a connecting head (121) which is used for adjusting an angle between the lock core clamp (13) and the dynamic loading device (12).

7. The measuring device of claim 1, wherein, The dynamic loading device (12) is an electric cylinder.

8. The measuring device of claim 1, wherein, The pre-load force has a value which is one fourth of a value of the load force.

9. The measuring device of claim 2, wherein, The measuring device (1) further comprises a stepper motor, which is in driving connection with the lead screw (14), and is used for adjusting the length of the lead screw (14).

10. The measuring device according to any of claims 1-9, characterized in that The vehicle body frame (3) is a body-in-white or a whole vehicle.

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