A torque detection device and a method for detecting pre-tightening torque of a drive shaft locking nut

Abstract

The present invention provides a torque detection device and a method for detecting the pre-tightening torque of a drive shaft locking nut, which relate to the technical field of automobile parts detection and are used to solve the problem in the prior art that the torque value required for the locking nut when the mating surfaces of the drive shaft and the wheel hub are in contact cannot be accurately measured. The torque detection device includes a drive assembly, an infrared transceiver assembly, and a display control assembly. The drive assembly is used to drive the locking nut to rotate. The infrared transceiver assembly includes an infrared transmitter and an infrared receiver. The infrared transmitter is used to transmit infrared rays, and the infrared receiver is used to receive infrared rays emitted by the infrared transmitter. The display control assembly is used to adjust the operating status of the drive assembly according to the signal of the infrared receiver, and to display the torque loaded on the drive assembly. The torque detection device is used to detect the pre-tightening torque of the drive shaft locking nut.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts detection, and in particular to a torque detection device and a method for detecting the pre-tightening torque of a drive shaft locking nut. Background Art

[0002] To reduce the issue of unusual noise during vehicle startup, the driveshaft and wheel hub are typically connected using an interference fit. A lock nut is used to pull the driveshaft onto the wheel hub, securing the mating end faces. If the torque applied to the lock nut is less than the required torque, the driveshaft and wheel hub may not be properly installed, preventing the mating end faces from mating, leading to unusual noise and wheel damage.

[0003] To this end, the preload force of the locknut needs to be tested during production and commissioning. Currently, this method typically uses a torque wrench to tighten the locknut, and then manually visually determines whether the mating surfaces of the drive shaft and hub are in contact, and then reads the torque value when contact is made. However, this method has large errors and cannot accurately measure the torque required to tighten the locknut when the mating surfaces of the drive shaft and hub are in contact. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a torque detection device to solve the problem in the prior art that it is impossible to accurately measure the torque value required for the locking nut when the mating surfaces of the drive shaft and the wheel hub are in contact; the second purpose is to provide a method for detecting the pre-tightening torque of the drive shaft locking nut.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A torque detection device includes a drive assembly, an infrared transceiver assembly, and a display control assembly. The drive assembly is used to drive a locking nut to rotate. The infrared transceiver assembly includes an infrared transmitter and an infrared receiver. The infrared transmitter transmits infrared rays, and the infrared receiver receives the infrared rays transmitted by the infrared transmitter. The display control assembly adjusts the operating status of the drive assembly based on signals from the infrared receiver and displays the torque applied to the drive assembly.

[0007] According to the above technical approach, since the drive assembly, infrared transceiver assembly, and display control assembly are included, the display control assembly, drive assembly, and infrared receiver can be electrically connected during torque detection. The infrared transmitter and infrared receiver can be arranged relative to each other on the same horizontal plane, so that the infrared transmitter can emit infrared rays toward the infrared receiver. Furthermore, the wheel hub can be fixed between the infrared transmitter and the infrared receiver, with the end face of the wheel hub that mates with the drive shaft lying on this horizontal plane.

[0008] At this point, the display control assembly can be used to control the drive assembly to rotate the locking nut, causing the drive shaft to gradually approach the mating end face of the wheel hub. When the drive shaft and the mating end face of the wheel hub are in contact, the infrared rays emitted by the infrared transmitter are blocked by the drive shaft and the wheel hub, and the infrared receiver cannot receive the infrared rays. The display control assembly can detect this state through the infrared receiver, thereby controlling the operating state of the drive assembly and reading and displaying the torque applied to the drive assembly. Thus, the torque detection device can accurately measure the pre-tightening torque required for the locking nut when the mating end face of the drive shaft and the wheel hub are in contact.

[0009] Furthermore, the torque detection device may also include a simulated hub. The simulated hub has a connecting hole. The inner wall of the connecting hole forms an internal spline. The internal spline is configured to mate with the external spline of the drive shaft. Along the axis of the connecting hole, the two end surfaces of the simulated hub are configured to mate with the drive shaft and a locking nut, respectively.

[0010] According to the above-mentioned means, by using a simulated wheel hub to replace the wheel hub, it is possible to avoid directly using the wheel hub for testing, thereby preventing the wheel hub from being damaged after multiple tests.

[0011] Furthermore, the flatness of the surface of the simulated hub for fitting with the drive shaft may be less than or equal to 0.5 mm.

[0012] According to the above means, the surface of the simulated wheel hub is relatively flat, so that the surface of the simulated wheel hub can better fit with the drive shaft.

[0013] Furthermore, the roughness of the surface of the simulated hub for fitting with the drive shaft may be less than or equal to 3.2 μm.

[0014] According to the above means, the surface of the simulated wheel hub is relatively smooth, so that the surface of the simulated wheel hub can better fit the drive shaft.

[0015] Furthermore, the drive assembly may include a sleeve and a torque drive mechanism. The sleeve has a mounting slot formed therein. The mounting slot can be used to accommodate a lock nut, which rotates as the sleeve rotates. The torque drive mechanism has an output shaft connected to the sleeve. The torque drive mechanism can be used to drive the sleeve to rotate about the output shaft.

[0016] According to the above means, driven by the torque drive mechanism, the locking nut can rotate as the sleeve rotates, so that the drive shaft moves toward the locking nut and fits with the matching end face of the simulated wheel hub.

[0017] A method for detecting the pre-tightening torque of a drive shaft locking nut comprises the following steps: fixing a wheel hub and passing a drive shaft through the wheel hub and connecting it to the locking nut. An infrared receiver and an infrared transmitter are respectively disposed on a plane located on the end face of the wheel hub away from the locking nut, and are disposed on opposite sides of the wheel hub. The locking nut is connected to a drive assembly. A display control assembly controls the movement of the drive assembly so that the drive shaft moves toward the wheel hub. When the infrared receiver cannot receive the infrared rays emitted by the infrared transmitter, the display control assembly reads and displays the torque applied to the drive assembly.

[0018] According to the above means, through the cooperation of the infrared receiver, infrared transmitter, display control component and drive component, when the infrared receiver cannot receive the infrared rays emitted by the infrared transmitter, the mating end faces of the drive shaft and the wheel hub are fitted together, and the display control component can obtain and display the actual pre-tightening torque required by the locking nut through the drive component. The detection method is simple and the detection results are relatively accurate.

[0019] Furthermore, the display control assembly controlling the drive assembly to move the drive shaft toward the wheel hub may include the following steps: the display control assembly controlling the drive assembly to apply a first preset torque to rotate the locking nut; and when the locking nut stops rotating, the display control assembly controlling the drive assembly to uniformly increase the torque applied to the locking nut at a first preset rate.

[0020] According to the above approach, the locking nut rotates at a faster speed initially, allowing the drive shaft to more quickly approach the mating end face of the wheel hub. As the drive assembly gradually increases the torque on the locking nut at a first predetermined rate, the drive shaft slowly approaches the mating end face of the wheel hub, thereby accurately determining the actual pre-tightening torque of the locking nut when the mating end faces of the drive shaft and wheel hub are in contact.

[0021] Furthermore, the first preset torque may be 10 N.m, and the first preset speed may be 1 N.m / s.

[0022] This approach ensures that the locking nut, driven by the first preset torque, does not directly cause the mating end faces of the drive shaft and the wheel hub to abut against each other, thereby ensuring that the pre-tightening torque required for the locking nut when the mating end faces of the drive shaft and the wheel hub are in abutment can be measured later. Furthermore, when the first preset speed is 1 N.m / s, the drive shaft approaches the mating end face of the wheel hub at a slower speed, enabling better detection of the pre-tightening torque required for the locking nut.

[0023] Furthermore, the display control component controls the movement of the drive component to move the drive shaft toward the direction close to the wheel hub, which may include the steps of: the display control component controls the drive component to uniformly increase the torque on the locking nut at a second preset rate.

[0024] According to the above means, the drive shaft can be driven by the locking nut to gradually approach the mating end face of the hub at a gentle speed, so that the drive shaft moves relatively smoothly during the entire detection process.

[0025] Furthermore, the second preset rate may be 1 N.m / s.

[0026] According to the above-mentioned measures, the drive shaft can move toward the wheel hub at a slower speed, and the pre-tightening torque required by the locking nut can be better detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of the torque detection device provided by an embodiment of the present invention when in use;

[0028] Figure 2 Schematic diagram of the process of detecting the pre-tightening torque of the drive shaft locking nut provided by the embodiment of the present invention Figure 1 ;

[0029] Figure 3 Schematic diagram of the process of detecting the pre-tightening torque of the drive shaft locking nut provided by the embodiment of the present invention Figure 2 ;

[0030] Figure 4 Schematic diagram of the process of detecting the pre-tightening torque of the drive shaft locking nut provided by the embodiment of the present invention Figure 3 .

[0031] Reference numerals:

[0032] 100-torque detection device; 10-drive assembly; 11-sleeve; 111-mounting slot; 12-torque drive mechanism; 121-output shaft; 20-infrared transceiver assembly; 21-infrared transmitter; 22-infrared receiver; 30-display control assembly; 40-simulated wheel hub; 401-connecting hole; 200-locking nut; 300-drive shaft. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0034] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0035] When a car starts, relative rotation will occur between the drive shaft and the wheel hub, which can easily cause abnormal noise. In order to optimize the above problem, in the related art, the drive shaft and the wheel hub are connected by an interference fit. Specifically, the drive shaft is provided with an external spline, and the wheel hub is provided with an internal spline. A helix angle is provided on the external spline of the drive shaft. When connected, the external spline of the drive shaft and the internal spline of the wheel hub are matched. Since the external spline is provided with a helix angle, the internal spline and the external spline are interference fit, which reduces the spline torsional clearance and thus optimizes the problem of abnormal noise when the vehicle starts.

[0036] Due to the interference fit between the drive shaft and the wheel hub, the drive shaft and the wheel hub cannot be directly installed in one step. After the drive shaft is inserted into the wheel hub, it needs to be tightened with a locking nut at the other end of the wheel hub. The threaded fit between the locking nut and the drive shaft is used to fit the mating end faces of the drive shaft and the wheel hub so that the drive shaft and the wheel hub are installed in place.

[0037] During the locking process using the lock nut, torque needs to be applied to the lock nut to rotate it, which in turn causes the drive shaft to gradually approach the wheel hub as the lock nut rotates, and to fit the mating end surface of the wheel hub. However, if the torque applied to the lock nut is less than the actual required torque, the drive shaft and the mating end surface of the wheel hub will not fit together, resulting in improper installation.

[0038] To this end, the pre-tightening torque of the locknut must be tested during the production process to determine the torque required to tighten the locknut when the mating end faces of the drive shaft and hub are in contact. This torque is then used to guide design, matching, and production commissioning. In related technologies, manual visual inspection is used to determine whether the mating end faces of the drive shaft and hub are in contact, and the torque value recorded on a torque wrench at the time of contact is used as the final measurement.

[0039] However, the above measurement method requires manual judgment on whether the mating end faces of the drive shaft and the hub fit together. The final measurement value is prone to large errors, and the measurement result is less accurate, which in turn affects subsequent production, fitting and other steps.

[0040] Based on this, an embodiment of the present invention provides a torque detection device 100, which can be used to detect the pre-tightening torque of the locking nut 200 of the drive shaft 300, such as Figure 1 As shown, Figure 1This is a structural schematic diagram of the torque detection device 100 provided in an embodiment of the present invention when in use. The torque detection device 100 may include a driving component 10, an infrared transceiver component 20, and a display control component 30.

[0041] The drive assembly 10 can be used to drive the locking nut 200 to rotate. Figure 1 As shown, when the pre-tightening torque of the locking nut 200 is detected, the locking nut 200 is connected to the drive assembly 10. Driven by the drive assembly 10, the locking nut 200 can be rotated, so that the drive shaft 300 threadedly connected to the locking nut 200 can move toward the direction close to the locking nut 200.

[0042] Continue to refer to Figure 1 , the infrared transceiver assembly 20 may include an infrared transmitter 21 and an infrared receiver 22. The infrared transmitter 21 is used to transmit infrared rays, and the infrared receiver 22 is used to receive the infrared rays transmitted by the infrared transmitter 21. Figure 1 As shown, when in use, the infrared transmitter 21 and the infrared receiver 22 can be relatively arranged on the same horizontal plane, and the infrared transmitter 21 transmits infrared rays toward the infrared receiver 22 .

[0043] The display control component 30 is used to adjust the operating state of the drive component 10 according to the signal of the infrared receiver 22, and is used to display the torque loaded by the drive component 10. Figure 1 As shown, when in use, the display control component 30 can be electrically connected to the drive component 10 and the infrared receiver 22. In this way, the display control component 30 can receive the signal transmitted by the infrared receiver 22 and control the operating state of the drive component 10 according to the signal. The display control component 30 can also receive and display the torque applied to the drive component 10 through the drive component 10.

[0044] Based on this, the torque detection device 100 provided in this embodiment of the present invention includes a drive assembly 10, an infrared transceiver assembly 20, and a display control assembly 30. During torque detection, the display control assembly 30, the drive assembly 10, and the infrared receiver 22 can be electrically connected. The infrared transmitter 21 and the infrared receiver 22 can be arranged relative to each other on the same horizontal plane, allowing the infrared transmitter 21 to emit infrared rays toward the infrared receiver 22. Furthermore, the wheel hub can be fixed between the infrared transmitter 21 and the infrared receiver 22, with the end face of the wheel hub that mates with the drive shaft 300 located on this horizontal plane.

[0045] At this time, the display control component 30 can control the drive component 10 to drive the locking nut 200 to rotate, so that the drive shaft 300 gradually approaches the mating end face of the wheel hub. When the drive shaft 300 fits the mating end face of the wheel hub, the infrared rays emitted by the infrared transmitter 21 are blocked by the drive shaft 300 and the wheel hub, and the infrared receiver 22 cannot receive the infrared rays. The display control component 30 can receive this state through the infrared receiver 22, thereby controlling the operating state of the drive component 10 and reading and displaying the torque applied by the drive component 10. Therefore, the torque detection device 100 can accurately measure the pre-tightening torque required for the locking nut 200 when the drive shaft 300 fits the mating end face of the wheel hub.

[0046] In some embodiments, as Figure 1 As shown, the torque detection device 100 may also include a simulated hub 40. The simulated hub 40 is provided with a connecting hole 401. The inner wall of the connecting hole 401 forms an internal spline (not shown in the figure). The internal spline is used to cooperate with the external spline of the drive shaft 300. Along the axial direction of the connecting hole 401, the two end faces of the simulated hub 40 are respectively used to cooperate with the drive shaft 300 and the locking nut 200. In the actual detection process, multiple tests may be required. In this way, by using the simulated hub 40 to replace the wheel hub, it is possible to avoid directly using the wheel hub for testing, thereby avoiding the wheel hub from being damaged after multiple tests.

[0047] To enhance the versatility of the simulated hub 40, the internal splines of the simulated hub 40 can be designed to match multiple different models of drive shafts 300. This allows the same simulated hub 40 to be used when testing the preload torque of the locking nut 200 using different drive shafts 300, resulting in improved versatility. During use, the simulated hub 40 can be fixed in place for testing different drive shafts 300 and locking nuts 200, making it easy to operate. Of course, the internal splines of the simulated hub 40 and the diameter of the connecting hole 401 can also be designed based on the external spline parameters of a specific drive shaft 300.

[0048] Of course, in other embodiments, the drive shaft 300 may also be directly mated with the corresponding wheel hub, making testing more convenient. Furthermore, since the drive shaft 300 is directly mated with the corresponding wheel hub, the detected torque of the lock nut 200 is the pre-tightening torque required when the mating end faces of the drive shaft 300 and the corresponding wheel hub are in contact.

[0049] When using the simulated hub 40 to test the pre-tightening torque of the locking nut 200, in some embodiments, the flatness of the surface of the simulated hub 40 that mates with the drive shaft 300 can be less than or equal to 0.5 mm. In this case, the flatness of the surface of the simulated hub 40 that mates with the drive shaft 300 is good, thereby ensuring better fit with the drive shaft 300 during testing. For example, the flatness of the surface of the simulated hub 40 that mates with the drive shaft 300 can be 0.5 mm, 0.4 mm, etc.

[0050] In some embodiments, the surface roughness of the simulated hub 40 that mates with the drive shaft 300 can be 3.2 μm or less. In this case, the surface of the simulated hub 40 is relatively smooth, allowing it to better mate with the drive shaft 300. For example, the surface roughness of the simulated hub 40 can be 3.2 mm, 3.1 mm, or 3.0 mm, etc., and can be set according to actual needs. This is provided here as an example only.

[0051] In order to facilitate the driving assembly 10 to drive the locking nut 200 to rotate, as shown in FIG. Figure 1 As shown, in some embodiments, the drive assembly 10 may include a sleeve 11 and a torque drive mechanism 12. The sleeve 11 is formed with a mounting slot 111. The mounting slot 111 can be used to accommodate a locking nut 200, allowing the locking nut 200 to rotate as the sleeve 11 rotates. It will be understood that when the locking nut 200 is disposed in the mounting slot 111 of the sleeve 11, the sleeve 11 and the locking nut 200 are relatively fixed, allowing the locking nut 200 to rotate as the sleeve 11 rotates.

[0052] The torque drive mechanism 12 has an output shaft 121 connected to the sleeve 11. The torque drive mechanism 12 can drive the sleeve 11 to rotate about the output shaft 121. Driven by the torque drive mechanism 12, the locking nut 200 rotates with the sleeve 11, causing the drive shaft 300 to move toward the locking nut 200 and engage the mating end surface of the simulated hub 40.

[0053] It will be appreciated that, in order to display the torque and control the drive assembly 10, the display control assembly 30 may include a display screen and a controller (neither of which is shown in the figure). The controller may be electrically connected to the display screen. During use, the controller may be electrically connected to the infrared receiver 22 and the drive assembly 10. Thus, when the infrared receiver 22 fails to receive infrared rays, the controller may be informed by the infrared receiver 22, thereby controlling the drive assembly 10 to stop and obtaining the torque applied to the drive assembly 10 at that time. The controller may then transmit the obtained torque to the display screen for display.

[0054] On the other hand, the embodiment of the present invention also provides a method for detecting the pre-tightening torque of a drive shaft locking nut, such as Figure 2 As shown, Figure 2 Schematic diagram of the process of detecting the pre-tightening torque of the drive shaft locking nut provided by the embodiment of the present invention Figure 1 , the detection method may include steps S100 to S500.

[0055] S100: Fix the wheel hub and pass the drive shaft through the wheel hub and connect it with the lock nut. Figure 1 As shown, the hub can be Figure 1 The simulated hub 40 shown is tested by combining the simulated hub 40 with the drive shaft 300 and the locking nut 200. During testing, the simulated hub 40 can be fixed to a testing stand (not shown), and the mating end surface of the simulated hub 40 can be adjusted to a horizontal level. Next, the drive shaft 300 passes through the connecting hole 401 of the simulated hub 40, so that the external splines of the drive shaft 300 mate with the internal splines of the simulated hub 40, and mate with the locking nut 200 on the other side. The locking nut 200 can be screwed directly into the simulated hub 40 by the staff until it fits with the end surface on one side.

[0056] It is understood that when using a simulated hub 40 for testing, it is necessary to first design a corresponding simulated hub 40 according to the test requirements. Furthermore, the simulated hub 40 can be designed to accommodate different models of drive shafts 300. This allows the use of a single simulated hub 40 to test different drive shafts 300 and locking nuts 200.

[0057] S200: The infrared receiver and the infrared transmitter are respectively arranged on the plane where the end face of the wheel hub away from the locking nut is located, and are arranged on both sides of the wheel hub. Figure 1 As shown, the infrared receiver 22 and the infrared transmitter 21 can be fixed on both sides of the simulated wheel hub 40, and the infrared transmitter 21 and the infrared receiver 22 are located at Figure 1 The infrared ray emitted by the infrared emitter 21 is on the plane S shown.

[0058] S300: Connect the lock nut to the drive assembly. Figure 1 The locking nut 200 can be set in the sleeve 11 of the driving assembly 10, and the locking nut 200 is rotated under the drive of the sleeve 11. The size of the sleeve 11 can be selected according to the size of the locking nut 200.

[0059] S400: The display control component controls the movement of the drive component to move the drive shaft toward the direction close to the wheel hub. Figure 1 Under the action of the driving assembly 10, the driving shaft 300 will move toward Figure 1The wheel hub 40 moves downward and gradually fits into the mating end surface of the simulated wheel hub 40.

[0060] S500: When the infrared receiver cannot receive the infrared ray emitted by the infrared transmitter, the display control component reads and displays the torque loaded by the driving component.

[0061] For example, Figure 1 As shown, when the mating end surface of the simulated wheel hub 40 and the drive shaft 300 are in contact, the infrared rays emitted by the infrared transmitter 21 are blocked, and the infrared receiver 22 cannot receive the infrared rays. At this time, the torque applied by the drive assembly 10 is the required pre-tightening torque of the lock nut 200. The display control assembly 30 can then obtain and display the specific torque from the drive assembly 10.

[0062] Based on this, the drive shaft locking nut pre-tightening torque detection method provided by the embodiment of the present invention, through the cooperation of an infrared receiver, an infrared transmitter, a display control component and a drive component, when the infrared receiver cannot receive the infrared rays emitted by the infrared transmitter, the mating end faces of the drive shaft and the wheel hub are fitted, and the display control component can obtain and display the pre-tightening torque actually required by the locking nut through the drive component. The detection method is simple and the detection results are relatively accurate.

[0063] In some embodiments, as Figure 3 As shown, Figure 3 Schematic diagram of the process of detecting the pre-tightening torque of the drive shaft locking nut provided by the embodiment of the present invention Figure 2 , the display control component controls the movement of the driving component to make the driving shaft move toward the direction close to the wheel hub, which may include steps S401 to S402.

[0064] S401: The display control component controls the drive component to apply a first preset torque to drive the locking nut to rotate. In this way, the locking nut rotates under the action of the first preset torque applied by the drive component, thereby driving the drive shaft to move toward the wheel hub.

[0065] S402: After the locking nut stops rotating, the display control component controls the driving component to uniformly increase the torque on the locking nut at a first preset rate.

[0066] As can be seen from the above, the wheel hub and drive shaft have an interference fit, and the drive shaft's external splines have a helix angle. During the locking nut's rotation, torque must be continuously increased to cause the locking nut to rotate. Therefore, when the drive assembly uniformly increases the torque on the locking nut at a first predetermined rate, the locking nut can be ensured to rotate continuously, allowing the drive shaft to move to the mating end face of the wheel hub and engage.

[0067] Based on the above solution, because the drive assembly first rotates the lock nut at a first preset torque, the lock nut initially rotates at a faster speed, allowing the drive shaft to more quickly approach the mating end face of the wheel hub. Subsequently, as the drive assembly gradually increases the torque applied to the lock nut at the first preset rate, the drive shaft slowly approaches the mating end face of the wheel hub, thereby accurately determining the actual preload torque of the lock nut when the mating end faces of the drive shaft and wheel hub are in contact.

[0068] In some embodiments, the first preset torque may be 10 N.m, and the first preset speed may be 1 N.m / s.

[0069] Because 10 N.m is a moderate torque, the lock nut, driven by the first preset torque, will not directly cause the mating end faces of the drive shaft and the wheel hub to fit together. This ensures that the pre-tightening torque required for the lock nut to fit together can be measured later. Furthermore, when the first preset torque is 10 N.m, the lock nut can initially rotate at a faster speed, increasing the speed of the drive shaft.

[0070] When the first preset rate is 1 N.m / s, the torque increases at a slower rate, so that the drive shaft approaches the mating end face of the hub at a slower speed, and the pre-tightening torque required for the locking nut can be better detected.

[0071] It is understandable that the first preset torque and the first preset rate may also be other values. For example, the first preset torque may be 8 N.m, and the first preset rate may be 2 N.m / s, which may be set according to actual needs.

[0072] In other embodiments, Figure 4 As shown, Figure 4 Schematic diagram of the process of detecting the pre-tightening torque of the drive shaft locking nut provided by the embodiment of the present invention Figure 3 , the display control component controls the movement of the driving component to make the driving shaft move in a direction close to the wheel hub, which may include step S403.

[0073] S403: The display control component controls the driving component to uniformly increase the torque on the locking nut at a second preset rate.

[0074] Based on this solution, the drive shaft can be driven by the locking nut and gradually approach the mating end face of the hub at a gentle speed, so that the drive shaft moves relatively smoothly during the entire detection process.

[0075] In some embodiments, the second preset rate can also be 1 Nm / s. In this case, the drive shaft can move at a slower speed toward the wheel hub, which can better detect the required pre-tightening torque of the locking nut. Of course, the second preset rate can also be other values. For example, the second preset rate can also be 2 Nm / s.

[0076] It is understandable that the above-mentioned solution of loading different torques on the driving component can be achieved by the staff inputting corresponding conditions in the display control component.

[0077] Based on this, the torque detection device and detection method provided in the embodiment of the present invention have a simple detection method and can effectively detect the torque value actually required for the locking nut, thereby providing accurate detection for design verification and product inspection, and guiding subsequent design matching and production debugging.

[0078] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A torque detection device for detecting the pre-tightening torque of a drive shaft locking nut, characterized in that: include: A driving assembly, used to drive the locking nut to rotate; The infrared transceiver assembly includes an infrared transmitter and an infrared receiver; the infrared transmitter is used to transmit infrared rays; The infrared receiver is used to receive the infrared rays emitted by the infrared transmitter; as well as, a display control component, used to adjust the operating state of the drive component according to the signal of the infrared receiver, and to display the torque loaded by the drive component; A simulated wheel hub is provided with a connecting hole, wherein an inner spline is formed on the inner wall of the connecting hole; the inner spline is used to cooperate with the outer spline of the drive shaft; along the axis of the connecting hole, the two end surfaces of the simulated wheel hub are respectively used to fit with the drive shaft and the locking nut; The infrared receiver and the infrared transmitter are respectively placed on a plane where the end surface of the simulated wheel hub away from the locking nut is located, and are relatively arranged on two sides of the simulated wheel hub.

2. The torque detection device according to claim 1, characterized in that: The flatness of the surface of the simulated hub for fitting with the drive shaft is less than or equal to 0.5 mm.

3. The torque detection device according to claim 2, characterized in that: The roughness of the surface of the simulated hub for fitting with the drive shaft is less than or equal to 3.2 μm.

4. The torque detection device according to claim 1, wherein: The drive assembly includes: a sleeve, wherein the sleeve is formed with a mounting groove; the mounting groove is used to place the locking nut so that the locking nut rotates as the sleeve rotates; and A torque driving mechanism, wherein the torque driving mechanism has an output shaft; the output shaft is connected to the sleeve; the torque driving mechanism is used to drive the sleeve to rotate around the output shaft.

5. A method for detecting the pre-tightening torque of a drive shaft locking nut using the torque detection device according to any one of claims 1 to 4, characterized in that: The detection method comprises: Fix the wheel hub and pass the drive shaft through the wheel hub and connect it with the lock nut; The infrared receiver and the infrared transmitter are respectively placed on the plane where the end surface of the wheel hub away from the locking nut is located, and are arranged on two sides of the wheel hub opposite to each other; Connect the lock nut to the drive assembly; The display control component controls the movement of the driving component to move the driving shaft toward the direction close to the wheel hub; When the infrared receiver fails to receive the infrared ray emitted by the infrared transmitter, the display control component reads and displays the torque applied by the driving component; Wherein, the display control component is electrically connected to the infrared receiver and the driving component.

6. The method for detecting the pre-tightening torque of a drive shaft locking nut according to claim 5, characterized in that: The display control component controls the driving component to move so that the driving shaft moves toward the direction close to the wheel hub, which includes: The display control component controls the driving component to load a first preset torque value to drive the locking nut to rotate; When the locking nut stops rotating, the display control component controls the driving component to uniformly increase the torque on the locking nut at a first preset rate.

7. The method for detecting the pre-tightening torque of a drive shaft locking nut according to claim 6, characterized in that: The first preset torque is 10 N.m, and the first preset speed is 1 N.m / s.

8. The method for detecting the pre-tightening torque of a drive shaft locking nut according to claim 5, characterized in that: The display control component controls the driving component to move so that the driving shaft moves toward the direction close to the wheel hub, which includes: The display control component controls the drive component to uniformly increase the torque on the locking nut at a second preset rate.

9. The method for detecting the pre-tightening torque of a drive shaft locking nut according to claim 8, wherein: The second preset rate is 1 N.m.

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