Driving shaft three-pin joint shake detection device and detection method

Abstract

The invention relates to the technical field of driving shaft performance detection, in particular to a driving shaft three-pin joint shake detection device which comprises a detection platform, a driving element, a load element, a vibration acceleration sensor and a to-be-detected driving shaft. The driving element and the load element are connected to the detection platform, a three-pin joint at one end of the to-be-detected driving shaft is in transmission connection with the output end of the driving element, a fixed joint at the other end of the to-be-detected driving shaft is connected with the input end of the load element, and the vibration acceleration sensor is arranged at the connecting position of the three-pin joint and the driving element. The detection end of the vibration acceleration sensor faces the three-pin joint and is used for detecting vibration data of the three-pin joint in the driving process. The invention aims to realize driving shaft three-pin joint jitter detection and quickly identify the after-sale jitter risk of the driving shaft caused by the three-pin joint in the initial stage of research and development.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drive shaft performance detection, and in particular to a drive shaft three-pin joint shaking detection device and method. BACKGROUND

[0002] The drive shaft is a key core component of the power system of the automobile chassis, which is installed between the wheel and the reducer, and mainly bears the torque and speed transmission function. Figure 3 As shown in the figure, the current mainstream drive shaft is composed of a sliding joint 50, a fixed joint 52 and a shaft rod 53, and the sliding joint 50 includes a three-pin joint 51.

[0003] New energy vehicles take improving the driving comfort and quietness as the core demand, and compared with traditional fuel vehicles, they are more sensitive to the NVH (noise, vibration and roughness) performance and shaking phenomenon of the drive shaft, and customers are easy to detect related problems. In order to reduce the complaints of after-sales customers and improve customer satisfaction, it is urgent to carry out targeted verification of the shaking risk of the three-pin joint through special bench verification test device and method, so as to realize the early identification and prevention and control of the risk.

[0004] There is no special bench device and matching detection scheme for the three-pin joint in the current industry, and the related performance verification completely depends on the high mileage reliability road test of the whole vehicle or the feedback of the after-sales market. This mode not only leads to serious lag in problem discovery, but also greatly prolongs the subsequent rectification and verification period, resulting in very high time and economic cost. SUMMARY

[0005] In view of the above shortcomings of the prior art, the purpose of the present application is to provide a drive shaft three-pin joint shaking detection device and method, which aims to realize the shaking detection of the drive shaft three-pin joint and quickly identify the drive shaft after-sales shaking risk caused by the three-pin joint in the early stage of research and development.

[0006] To solve the above technical problems, the present application discloses the following technical scheme: In a first aspect, the present application discloses a drive shaft three-pin joint shaking detection device, which comprises a detection platform, a driving element, a load element, a vibration acceleration sensor and a to-be-detected drive shaft; the driving element and the load element are connected to the detection platform, the three-pin joint at one end of the to-be-detected drive shaft is in transmission connection with the output end of the driving element, the fixed joint at the other end of the to-be-detected drive shaft is connected with the input end of the load element, the vibration acceleration sensor is arranged at the connection position of the three-pin joint and the driving element, and the detection end of the vibration acceleration sensor is arranged towards the three-pin joint, for detecting the vibration data of the three-pin joint in the driving process.

[0007] In the technical scheme, the driving element provides power input, and the load element simulates actual running resistance, so that the real working state of the three-pin joint of the driving shaft to be detected is reproduced in the bench environment, and the detection can be carried out without relying on high mileage road test of the whole vehicle, thereby solving the passive situation that the industry can only verify through the whole vehicle or after-sales verification. The vibration acceleration sensor is arranged at the connection position of the three-pin joint and the driving element, and the detection end directly faces the three-pin joint, so that the vibration data of the three-pin joint itself in the driving process can be accurately captured, the interference of vibration signals of other components of the driving shaft to be detected is avoided, the directional detection of the three-pin joint jitter, which is a core risk point, is realized, and the detection is more targeted than traditional whole vehicle verification.

[0008] In an embodiment, the input end of the three-pin joint is fixedly connected with a first chuck, and the first chuck is in transmission connection with the output end of the driving element.

[0009] In the technical scheme, the first chuck plays a double role of fixation and transmission, the coaxiality of the three-pin joint and the output end of the driving element can be ensured through rigid clamping, installation deviation and gap looseness that may occur due to direct connection are avoided, and additional vibration caused by connection misalignment is reduced.

[0010] In an embodiment, a linear sliding groove is arranged on the detection platform, a first sliding block is in sliding connection with the linear sliding groove, and the driving element is fixed to the first sliding block, so that the driving element is driven to move along the length direction of the linear sliding groove through the first sliding block.

[0011] In the technical scheme, the sliding cooperation structure of the linear sliding groove and the first sliding block is adopted, the position of the first sliding block along the linear sliding groove is adjusted, the driving element is driven to move synchronously, and then the distance between the output end of the driving element and the input end of the load element is flexibly adjusted. Then, without replacing the detection platform or customizing special connecting pieces, the driving shafts of different lengths to be detected can be adapted, the limitation that the fixedly installed driving element can only detect a single specification of driving shaft is solved, and the compatibility of the device for multiple types of driving shafts is greatly improved.

[0012] In an embodiment, a displacement sensor is connected to the first sliding block, and is used for monitoring the displacement distance of the first sliding block in real time.

[0013] In the technical scheme, the displacement sensor can feed back the specific displacement distance of the first sliding block in real time, and replace the traditional manual measurement and experience adjustment mode, so that the problems of over-tightening or over-loosening of the driving shaft caused by distance estimation deviation are avoided.

[0014] In an embodiment, the output end of the fixed joint is fixedly connected with a second chuck, and the second chuck is connected with the input end of the load element.

[0015] In the technical scheme, the second chuck is used as a connecting medium of the fixed joint and the load element, the coaxiality of the fixed joint and the input end of the load element can be ensured through rigid clamping, and the three-pin joint and the fixed joint at the two ends of the drive shaft to be detected form a transmission structure that is precisely connected.

[0016] In an embodiment, the rack is further provided with a mounting surface for placing the detection platform, and the mounting surface is provided with an arc-shaped sliding groove, and a second sliding block is slidably connected to the arc-shaped sliding groove, so that the detection platform is driven to move along the arc-shaped sliding groove to adjust the included angle between the three-pin joint and the shaft rod of the drive shaft to be detected.

[0017] In the technical scheme, the second sliding block slides along the arc-shaped sliding groove to drive the detection platform to adjust the included angle between the three-pin joint and the shaft rod, and the core real scene is accurately reproduced. Compared with the previous fixed-angle detection that can only simulate a single working condition of uniform straight-line driving, the design greatly improves the completeness of the working condition reproduction, and makes the three-pin joint shaking detection more in line with the complex state in actual use.

[0018] In an embodiment, an angle sensor is connected to the three-pin joint, and the angle sensor is used to detect the included angle between the three-pin joint and the shaft rod of the drive shaft to be detected in real time.

[0019] In the technical scheme, the angle sensor is used to output accurate included angle values in real time, which can ensure quick positioning to the target angle during adjustment, and avoid detection deviation caused by inaccurate angle estimation, so that the angle adjustment is upgraded from qualitative judgment to quantitative control.

[0020] In an embodiment, a ball cage is provided outside the three-pin joint and the fixed joint, a temperature sensor is connected in the ball cage, and a temperature adjusting element is arranged outside the ball cage.

[0021] In the technical scheme, the temperature sensor is placed in the ball cage to monitor the real working temperature around the three-pin joint in real time, and the temperature adjusting element can simulate different temperature working conditions, and cooperate with the ball cage to restore the real temperature environment of the three-pin joint, so that the working condition reproduction is closer to the actual use scene.

[0022] In an embodiment, the temperature adjusting element is a fan, the fan is electrically connected with the temperature sensor, a detection end of the temperature sensor extends into the inside of the ball cage to monitor the temperature data in the ball cage in real time, and when the temperature sensor detects that the temperature in the ball cage is higher than a preset threshold, the fan is started to blow air to the ball cage to control the temperature of the ball cage within a preset range.

[0023] In the technical solution, the temperature sensor is directly electrically connected with the fan to form a closed loop control of monitoring, triggering and temperature reduction. When the temperature in the ball cage is higher than the preset threshold, the fan can be immediately started to blow air to the ball cage without manual intervention, so as to avoid continuous temperature rise to cause accelerated failure of the lubricating grease or damage of the components, and ensure that the temperature in the ball cage is always stable in the preset detection range.

[0024] In a second aspect, the embodiments of the present application disclose a driving shaft three-pin joint shake detection method, which comprises: The driving shaft three-pin joint shake detection device is used to install the driving shaft three-pin joint to be detected; The loading condition is set, and the device is continuously operated according to the loading condition; The vibration acceleration of the three-pin joint during operation is collected, if the vibration acceleration is greater than or equal to the preset threshold, it is determined that the three-pin joint shake detection is unqualified, and if the vibration acceleration is less than the preset threshold, it is determined that the three-pin joint shake detection is qualified.

[0025] In the technical solution, the driving shaft three-pin joint shake detection can be simulated in the development stage under the real vehicle working condition, without waiting for the high mileage road test of the whole vehicle or relying on the feedback of the after-sales market, so that the shake risk of the three-pin joint can be detected in the development verification stage before the product is put on the market, avoiding the long cycle of problem exposure, rework, and secondary road test in the traditional mode, accelerating the process from development to mass production, and winning the time window for technical iteration. Moreover, the vibration acceleration and the preset threshold are compared as the basis for qualification determination, replacing the traditional mode which may rely on subjective perception of human, reducing human error, and ensuring the consistency and reliability of the detection results.

[0026] In an embodiment, the loading condition comprises a loading torque, a rotating speed, an angle between the three-pin joint and the shaft of the driving shaft to be detected, and a swing frequency; and the loading condition is acquired according to the real vehicle under the target working condition.

[0027] In the technical solution, the loading condition is customized according to the target working condition of the real vehicle, avoiding excessive detection or insufficient detection caused by using uniform general parameters.

[0028] The detection device of the present application has the following beneficial effects: the detection device of the present application provides power input through the driving element, simulates the actual running resistance through the load element, reproduces the real working state of the three-pin joint of the driving shaft to be detected in the bench environment, and can carry out detection without relying on the high mileage road test of the whole vehicle, solving the passive situation that the industry can only verify through the whole vehicle or after-sales. The vibration acceleration sensor is arranged at the connection position of the three-pin joint and the driving element, and the detection end directly faces the three-pin joint, which can accurately capture the vibration data of the three-pin joint itself during driving, avoid interference of the vibration signals of other components of the driving shaft to be detected, realize directional detection of the three-pin joint shake which is a core risk point, and is more targeted than the traditional whole vehicle verification. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0030] Figure 1 This is a schematic diagram of the drive shaft three-pin joint vibration detection device disclosed in the embodiments of this application; Figure 2 This is a top view of the rack disclosed in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the drive shaft under test disclosed in an embodiment of this application; Figure 4 This is a schematic diagram of the three-pin joint structure of the drive shaft under test disclosed in an embodiment of this application; Figure 5 This is a flowchart illustrating the drive shaft three-pin joint vibration detection method disclosed in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures: 1—Detection platform, 11—Linear slide, 12—First slider, 2—Drive element, 3—Load element, 4—Vibration acceleration sensor, 5—Drive shaft to be tested, 50—Sliding joint, 51—Three-pin joint, 52—Fixed joint, 53—Shaft, 54—Ball cage, 541—First clamp, 542—Dust cover, 543—Connecting sleeve, 544—Second clamp, 55—Housing, 6—First chuck, 7—Second chuck, 8—Frame, 81—Arc-shaped slide, 82—Second slider, 9—Temperature sensor, 10—Temperature regulating element. Detailed Implementation

[0032] In one embodiment, see Figure 1 As shown, this application provides a three-pin joint vibration detection device for a drive shaft, including a detection platform 1, a drive element 2, a load element 3, a vibration acceleration sensor 4, and a drive shaft 5 to be tested. The drive element 2 and the load element 3 are connected to the detection platform 1. The three-pin joint 51 at one end of the drive shaft 5 to be tested is connected to the output end of the drive element 2. The fixed joint 52 at the other end of the drive shaft 5 to be tested is connected to the input end of the load element 3. The vibration acceleration sensor 4 is arranged at the connection position between the three-pin joint 51 and the drive element 2, and the detection end of the vibration acceleration sensor 4 is set towards the three-pin joint 51 for detecting the vibration data of the three-pin joint 51 during the driving process.

[0033] The detection device provided by the application provides power input through the driving element 2, the load element 3 simulates the actual operating resistance, and the real working state of the three-pin joint 51 of the driving shaft 5 to be detected is reproduced in the bench environment, so that the detection can be carried out without relying on high mileage road test of the whole vehicle, and the passive situation that the industry can only be verified through the whole vehicle or after-sales is solved. The vibration acceleration sensor 4 is arranged at the connection position of the three-pin joint 51 and the driving element 2, and the detection end directly faces the three-pin joint 51, so that the vibration data of the three-pin joint 51 itself in the driving process can be accurately captured, the interference of the vibration signals of other components of the driving shaft 5 to be detected is avoided, the directional detection of the three-pin joint 51 is realized, and the detection is more targeted compared with the traditional whole vehicle verification.

[0034] The bench type detection can be quickly carried out in the laboratory environment, without waiting for the long period of whole vehicle road test, and avoiding the repeated cost of rectification and verification after the problem is found after the sale, so that the three-pin joint 51 shaking risk can be identified in advance, the verification period is greatly shortened, and the time and economic loss caused by the problem lag are reduced.

[0035] By obtaining the vibration data of the three-pin joint 51, data support can be directly provided for the structure improvement and process optimization of the three-pin joint 51 of the driving shaft 5 to be detected, the occurrence rate of the shaking problem of the new energy vehicle driving shaft is reduced from the source, and then the after-sales customer complaints are reduced, and the customer satisfaction is improved.

[0036] As a preferred embodiment of the application, referring to Figure 1 As shown in the figure, the input end of the three-pin joint 51 is fixedly connected with the first chuck 6, and the first chuck 6 is in transmission connection with the output end of the driving element 2.

[0037] The first chuck 6 plays a double role of fixation and transmission, can guarantee the coaxiality of the three-pin joint 51 and the output end of the driving element 2 through rigid clamping, avoids the problems such as installation deviation and gap looseness that may occur due to direct connection, reduces the additional vibration caused by the connection misalignment, further reduces the vibration signal interference of the non-three-pin joint 51 itself, makes the shaking data captured by the vibration acceleration sensor 4 closer to the real working state of the three-pin joint 51, improves the accuracy of the subsequent shaking risk judgment, and avoids the detection misjudgment caused by the connection error.

[0038] Exemplarily, the input end of the three-pin joint 51 is connected with the first chuck 6 through a spline.

[0039] As a preferred embodiment of the application, referring to Figure 1 As shown in the figure, a linear sliding groove 11 is arranged on the detection platform 1, a first sliding block 12 is slidably connected on the linear sliding groove 11, and the driving element 2 is fixed on the first sliding block 12. The driving element 2 is driven to move along the length direction of the linear sliding groove 11 through the first sliding block 12.

[0040] Different models, different specifications of the drive shaft length difference, the straight sliding groove 11 and the first slider 12 sliding fit structure, by adjusting the position of the first slider 12 along the straight sliding groove 11, drive element 2 synchronous movement, and then flexible adjustment of the drive element 2 output and load element 3 input spacing. The design does not need to replace the detection platform 1 or custom special connecting piece, can adapt to different length of the drive shaft 5 to be detected, solves the fixed installation type drive element can only detect a single specification drive shaft limitations, greatly improves the compatibility of the device for multiple models of drive shaft.

[0041] It should be noted that the first slider 12 and the straight sliding groove 11 sliding fit usually has reliable positioning and locking function (such as bolt locking, buckle fixing), after the drive element 2 position adjustment in place, the first slider 12 can be fixed by locking structure, to avoid the displacement of the drive element 2 due to vibration, torque effect in the detection process. So set, both the flexibility of position adjustment, but also to ensure the stability of the power transmission process structure, prevent the transmission failure or security risks caused by the displacement of the drive element 2.

[0042] As a preferred embodiment of the present application, the first slider 12 is connected with a displacement sensor for real-time monitoring of the displacement distance of the first slider 12.

[0043] When adapting to different length of the drive shaft 5 to be detected, the position of the first slider 12 needs to be adjusted to adjust the distance between the drive element 2 and the load element 3, the displacement sensor can real-time feedback the specific displacement distance of the first slider 12, instead of the traditional manual measurement and experience adjustment method, to avoid the problem of over-tight or over-loose drive shaft clamping caused by the deviation of the spacing estimation, to ensure that each drive shaft 5 to be detected can be in the state of accurate detection, further improve the adaptation accuracy of the device for multiple models of drive shaft.

[0044] Moreover, if the first slider 12 locking fails, the drive element 1 is abnormally stressed to cause unexpected displacement during the detection process, the displacement sensor can capture the displacement change beyond the set range in real time, so as to trigger the alarm (such as shutdown prompt) in time, to avoid the safety accidents such as the falling of the drive shaft 5 to be detected and the collision of the transmission components caused by the disordered movement of the first slider 12, compared with the passive protection relying only on the locking structure, the active monitoring safety protection link is added.

[0045] As a preferred embodiment of the present application, referring to Figure 1 The output end of the fixed node 52 is fixedly connected with the second chuck 7, and the second chuck 7 is connected with the input end of the load element 3.

[0046] The second chuck 7 is connected to the load element 3 as a fixed joint 52, and the rigidity of the chuck can ensure the coaxiality of the fixed joint 52 and the input end of the load element 3. The first chuck 6 and the second chuck 7 together form a transmission structure in which the three-pin joint 51 and the fixed joint 52 at both ends of the drive shaft 5 to be detected are precisely connected. In this way, the additional vibration caused by the connection deviation of the fixed joint 52 and the load element 3 is effectively avoided, the interference signal of the three-pin joint itself is reduced, the accuracy of the vibration acceleration sensor 4 in capturing the jitter data of the three-pin joint 51 is further improved, and the detection result is closer to the actual jitter state under the real working condition.

[0047] As a preferred embodiment of the present application, referring to Figure 1 and Figure 2 , the rack 8 is further provided with a mounting surface for placing the detection platform 1, and the mounting surface is provided with an arc-shaped sliding groove 81, and the second sliding block 82 is slidably connected to the arc-shaped sliding groove 81. The second sliding block 82 drives the detection platform 1 to move along the arc-shaped sliding groove 81 to adjust the included angle between the three-pin joint 51 and the shaft rod 53 of the drive shaft 5 to be detected.

[0048] During driving of the vehicle (such as steering, passing over a bumpy road, suspension compression / extension), the three-pin joint 51 and the shaft rod 53 of the drive shaft are not always in a fixed coaxial state, but a dynamic included angle change occurs. In the preferred embodiment, the second sliding block 82 slides along the arc-shaped sliding groove 81 to drive the detection platform 1 to adjust the included angle between the three-pin joint 51 and the shaft rod 53, and accurately reproduce this core real scene. Compared with the previous fixed-angle detection which can only simulate a single working condition of uniform straight-line driving, this design greatly improves the completeness of the working condition reproduction, and makes the three-pin joint 51 jitter detection more suitable for the complex state in actual use.

[0049] As a preferred embodiment of the present application, referring to Figure 1 , an angle sensor is connected to the three-pin joint 51, and the angle sensor is used to detect the included angle between the three-pin joint 51 and the shaft rod 53 of the drive shaft 5 to be detected in real time.

[0050] The angle sensor is directly connected to the three-pin joint 51 and can output accurate included angle values in real time, which can not only ensure quick positioning to the target angle during adjustment, but also avoid detection deviation caused by inaccurate angle estimation, and upgrade the angle adjustment from qualitative judgment to quantitative control. Moreover, the angle sensor can synchronously capture the dynamic trajectory of the included angle, and in combination with the rotation speed of the drive element 2 and the resistance parameters of the load element 3, accurately reproduce the complex working condition in which the dynamic included angle, torque and rotation speed are matched, which is more suitable for the actual driving state of the vehicle than the fixed-angle detection, and makes the exposure of the three-pin joint jitter risk more comprehensive.

[0051] As a preferred embodiment of the present application, referring to Figure 1As shown, the three-pin joint 51 and the fixed joint 52 are sleeved with a ball cage 54, the ball cage 54 is connected with a temperature sensor 9 inside, and the ball cage 54 is arranged with a temperature adjusting element 10 outside.

[0052] During vehicle driving, the three-pin joint 51 generates heat due to internal friction and environmental temperature fluctuation, and its working temperature will continue to change. The temperature directly affects the performance of the grease in the ball cage 54, and further induces the shaking. The temperature sensor 9 is built-in the ball cage 54, which can monitor the real working temperature around the three-pin joint 51 in real time. The temperature adjusting element 10 can simulate different temperature conditions, and cooperate with the ball cage 54 to restore the real temperature environment of the three-pin joint 51, so as to make the working condition more close to the actual use scene.

[0053] Referring to Figure 4 As shown, the ball cage 54 specifically includes a first clamp 541, a dust cover 542, a connecting sleeve 543, and a second clamp 544. One end of the dust cover 542 is connected with the driving shaft body through the first clamp 541, the other end of the dust cover 542 is connected with the connecting sleeve 543, and the connecting sleeve 543 is fixedly connected with the shell 55 outside the three-pin joint 51 through the second clamp 544.

[0054] As a preferred embodiment of the present application, referring to Figure 1 As shown, the temperature adjusting element 10 is a fan, the fan is electrically connected with the temperature sensor 9, the detection end of the temperature sensor 9 extends into the inside of the ball cage 54, and is used for monitoring the temperature data in the ball cage 54 in real time. When the temperature sensor 9 monitors that the temperature in the ball cage 54 is higher than a preset threshold, the fan starts to blow air to the ball cage 54, so as to control the temperature of the ball cage 54 within a preset range.

[0055] In the preferred embodiment, the temperature sensor 9 is directly electrically connected with the fan, forming a closed-loop control of monitoring, triggering and cooling. When the temperature in the ball cage 54 is higher than the preset threshold, the fan can immediately start to blow air to the ball cage 54 without manual intervention, avoiding that the temperature continues to rise to cause the failure of the grease to be aggravated or the damage of the components, and ensuring that the temperature in the ball cage 54 is always stable within the preset detection range.

[0056] The fan adopts the blowing air cooling mode, without the need to open a complex pipeline interface on the ball cage 54, and only needs to realize the cooling through air circulation, which can maximize the integrity of the ball cage, and avoid the installation deviation or detection interference of the three-pin joint caused by additional modification of the interface.

[0057] As a preferred embodiment of the present application, the driving element 2 is a servo motor.

[0058] The servo motor has high-precision speed and torque regulation capability, can accurately output power parameters under different working conditions according to detection requirements, can reproduce dynamic power changes in the real work of the to-be-detected driving shaft 5, and provides a more actual power input scene for three-pin joint jitter detection.

[0059] In an embodiment, referring to Figure 5 The embodiment of the application discloses a driving shaft three-pin joint jitter detection method, which comprises the following steps: The to-be-detected driving shaft 5 comprising the three-pin joint 51 is installed on the driving shaft three-pin joint jitter detection device described in any of the embodiments; The loading conditions are set, and the loading conditions are continuously run; The vibration acceleration of the three-pin joint 51 in the running process is collected, if the vibration acceleration is greater than or equal to a preset threshold, it is determined that the three-pin joint jitter detection is unqualified, and if the vibration acceleration is less than the preset threshold, it is determined that the three-pin joint jitter detection is qualified.

[0060] The method provided in the embodiment can simulate real vehicle working conditions to complete driving shaft three-pin joint jitter detection in the research and development stage, without waiting for high mileage road test of the whole vehicle or relying on feedback from the after-sales market, so that the jitter risk of the three-pin joint can be brought forward to the research and development verification stage after the product is put on the market, the long cycle of problem lag exposure, rework rectification and secondary road test in the traditional mode is avoided, and the process from research and development to mass production of the product is accelerated, time window is won for technical iteration. Moreover, the vibration acceleration is compared with the preset threshold as the basis for qualification determination, which replaces the traditional mode that may rely on subjective perception of artificial, reduces human error, and ensures consistency and reliability of the detection result.

[0061] As a preferred embodiment of the application, the loading conditions include a loading torque, a speed, an angle between the three-pin joint and a shaft rod of the to-be-detected driving shaft, and a swing frequency; and the loading conditions are acquired according to the real vehicle under the target working condition.

[0062] In this embodiment, the loading conditions are customized according to the target working condition of the real vehicle, so that over-detection or insufficient detection caused by the use of uniform general parameters is avoided.

[0063] Specifically, the collection of each parameter comprises: 1) Torque parameter collection: a torque sensor is installed on the driving shaft of the real vehicle, covering typical working conditions such as urban roads, highways, and climbing. Real-time torque data under different working conditions are collected, peak torque and average torque are counted, a reasonable correction coefficient A is calculated in combination with the design static torque strength, the torque parameter is set as the product of the correction coefficient A and the design static torque strength, and the equivalent real vehicle limit or common load of the bench loading is ensured.

[0064] 2) Rotational speed parameter acquisition: the real vehicle wheel speed sensor and the motor controller rotational speed data are used to obtain the real-time rotational speed of the drive shaft through the transmission ratio conversion. For example, the drive shaft rotational speed in the real vehicle high-frequency driving condition (such as 60-120 km / h uniform speed) is counted, and the typical value in this interval is taken as the rotational speed setting value.

[0065] 3) Angle parameter acquisition: a high-precision angle sensor is installed at the connection between the real vehicle drive shaft slip joint and the shaft rod. The angle change data under the conditions of turning, bumpy road, slope and the like are collected, the maximum and minimum values of the angle are extracted, and the swing range, i.e., the angle parameter setting value, is determined.

[0066] 4) Frequency parameter acquisition: based on the continuous collection data of the real vehicle angle sensor, the angle-time change curve is generated. The main frequency component of the curve is extracted through a frequency spectrum analysis tool (such as Fourier transform), and the main frequency is the test bench swing frequency setting value.

[0067] For example, when the drive shaft three-pin joint shaking detection device described in the present application is used for detection, the following steps are specifically included: S1 Drive shaft sample installation: the three-pin joint 51 of the drive shaft 5 to be detected is connected through the spline and the first chuck 6, the fixed joint 52 is connected through the spline and the second chuck 7, the first chuck 6 is in transmission connection with the driving element 2, and the second chuck 7 is in transmission connection with the load element 3. The position of the driving element 3 is adjusted through the first sliding block 11 and the second sliding block 82, so that the three-pin joint 51 is in a preset position. The temperature sensor 9 and the fan, i.e., the temperature adjusting element 10, are installed on the ball cage 54 of the drive shaft 5 to be detected, and are locked after adjustment.

[0068] S2 Test condition loading: the servo motor, i.e., the driving element 2, is loaded according to the designed static torsion strength *A coefficient and the rotational speed B r / min. The three-pin joint 51 is controlled to swing within the range of C°-D° with the shaft rod through the second sliding block 82, the swing frequency is set to E HZ, the fan and the temperature sensor 9 are used to control the real-time temperature of the ball cage 54 at both ends of the drive shaft to be lower than F ℃, and the Z-direction vibration acceleration is monitored in real time. S3 Test running: running G h according to the loading condition.

[0069] S4 Test result determination: if the Z-direction vibration acceleration is greater than X, it is determined that the three-pin joint 51 design has quality defects, and there is a quality risk after sale. If the Z-direction vibration acceleration is less than X, it is determined that the three-pin joint 51 design meets the use requirements.

[0070] The values of A, B, C, D, E, F, G and X are reasonably set according to the collection parameters of the real vehicle in the target working condition.

[0071] The drive shaft three-pin joint vibration detection device described in this application can detect potential high-mileage vibration quality problems in the drive shaft three-pin joint 51 in advance during the bench test stage, shortening the road test cycle and reducing costs. This device has a simple structure and is efficient and convenient.

[0072] The above embodiments are merely preferred embodiments provided to fully illustrate this application, and the scope of protection of this application is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on this application are all within the scope of protection of this application.

Claims

1. A device for detecting vibration of a three-pin drive shaft, characterized in that: The system includes a testing platform (1), a driving element (2), a load element (3), a vibration acceleration sensor (4), and a drive shaft to be tested (5); the driving element (2) and the load element (3) are connected to the testing platform (1). The three-pin joint (51) at one end of the drive shaft (5) under test is connected to the output end of the drive element (2), and the fixed joint (52) at the other end of the drive shaft (5) under test is connected to the input end of the load element (3). The vibration acceleration sensor (4) is arranged at the connection position between the three-pin joint (51) and the drive element (2), and the detection end of the vibration acceleration sensor (4) is set towards the three-pin joint (51) to detect the vibration data of the three-pin joint (51) during the driving process.

2. The drive shaft three-pin joint vibration detection device according to claim 1, characterized in that: The input end of the three-pin joint (51) is fixedly connected to the first chuck (6), and the first chuck (6) is drivenly connected to the output end of the driving element (2).

3. The drive shaft three-pin joint vibration detection device according to claim 2, characterized in that: The detection platform (1) is provided with a linear slide groove (11), and a first slider (12) is slidably connected on the linear slide groove (11). The driving element (2) is fixed on the first slider (12) and drives the driving element (2) to move along the length direction of the linear slide groove (11) through the first slider (12).

4. The drive shaft three-pin joint vibration detection device according to claim 3, characterized in that: A displacement sensor is connected to the first slider (12) to monitor the displacement distance of the first slider (12) in real time.

5. The drive shaft three-pin joint vibration detection device according to claim 1, characterized in that: The output end of the fixed section (52) is fixedly connected to the second chuck (7), and the second chuck (7) is connected to the input end of the load element (3).

6. The drive shaft three-pin joint vibration detection device according to claim 1, characterized in that: It also includes a frame (8), on which a mounting surface for placing the testing platform (1) is provided. An arc-shaped slide groove (81) is provided on the mounting surface. A second slider (82) is slidably connected to the arc-shaped slide groove (81). The testing platform (1) is driven to move along the arc-shaped slide groove (81) by the second slider (82) to adjust the included angle between the three-pin joint (51) and the shaft (53) of the drive shaft (5) to be tested. An angle sensor is connected to the three-pin joint (51), and the angle between the three-pin joint (51) and the shaft (53) of the drive shaft (5) under test is detected in real time by the angle sensor.

7. The drive shaft three-pin joint vibration detection device according to claim 1, characterized in that: The three pin joints (51) and the fixed joint (52) are covered with a ball cage (54), a temperature sensor (9) is connected inside the ball cage (54), and a temperature regulating element (10) is arranged outside the ball cage (54).

8. The drive shaft three-pin joint vibration detection device according to claim 7, characterized in that: The temperature regulating element (10) is a fan, which is electrically connected to the temperature sensor (9). The detection end of the temperature sensor (9) extends into the ball cage (54) to monitor the temperature data inside the ball cage (54) in real time. When the temperature sensor (9) detects that the temperature inside the ball cage (54) is higher than the preset threshold, the fan starts and blows air into the ball cage (54) to control the temperature of the ball cage (54) within the preset range.

9. A method for detecting vibration of a three-pin drive shaft, characterized in that, include: The drive shaft (5) to be tested, including the three-pin joint (51), is mounted on the drive shaft three-pin joint vibration detection device as described in any one of claims 1 to 8; Set loading conditions and run continuously according to those conditions; The vibration acceleration of the three-pin joint (51) during operation is collected. If the vibration acceleration is greater than or equal to the preset threshold, the vibration detection of the three-pin joint is deemed unqualified; if the vibration acceleration is less than the preset threshold, the vibration detection of the three-pin joint is deemed qualified.

10. The method for detecting vibration of a three-pin drive shaft according to claim 9, characterized in that: The loading conditions include loading torque, rotational speed, angle between the three-pin joint (51) and the shaft of the drive shaft (5) to be inspected, and oscillation frequency; The loading conditions are based on data collected from the actual vehicle under the target operating conditions.

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