Accumulated backlash angle detection device for speed reducer transmission system of electric vehicle and use method thereof

Abstract

The invention discloses an accumulated backlash angle detection device for a speed reducer transmission system of an electric vehicle and a use method of the accumulated backlash angle detection device. The accumulated backlash angle detection device comprises a bottom plate (1), a positioning assembly (2), an output locking assembly (3), an input driving assembly (4), an angle measuring assembly (5) and a control and display assembly (6). The output locking assembly (3) and the input driving assembly (4) are installed on the bottom plate (1) through the positioning assembly (2), and the speed reducer is installed on the detection device. The output locking assembly (3) locks the output end of the speed reducer, the control and display assembly (6) applies specified torque to enable the input driving assembly (4) to rotate forwards and backwards, a speed reducer input shaft (704) and the angle measuring assembly (5) rotate synchronously, and the accumulated backlash angle of a speed reducer transmission system is detected and displayed. The device can display the accumulated backlash angle of the speed reducer transmission system in real time and inversely calculate the accumulated backlash, and is convenient to operate and readable in data.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmission system backlash detection, and more specifically, relates to an electric vehicle reducer transmission system cumulative backlash angle detection device and a use method thereof. Background Art

[0002] With the rapid development of the electric vehicle industry, the requirements for the accuracy and reliability of the transmission system are increasing. The cumulative clearance angle of the transmission system is one of the key factors affecting its performance, which is directly related to the driving stability and power transmission efficiency of electric vehicles. In the transmission system of electric vehicles, the reducer is a core component. The small gaps of its internal gears, bearings and other components will gradually accumulate during long-term use, forming a cumulative clearance angle. The size of the system's cumulative clearance depends on the change in the working temperature of the gear train, the material and processing accuracy of its shell, the accuracy level of each gear pair, the lubrication method, etc. The size of the system's cumulative clearance affects the performance of the reducer, such as noise, abnormal shifting noise, etc.; even unqualified cumulative clearance of the transmission system can cause the reducer to be scrapped. This cumulative clearance angle will cause the instability of the transmission system, which in turn affects the driving quality of the electric vehicle. Therefore, accurate detection of the cumulative clearance angle of the transmission system has become an important part of improving the performance of electric vehicles. Therefore, the cumulative clearance angle of the transmission system of the reducer must have an accurate measurement value to determine whether the cumulative clearance of the transmission system of the reducer is qualified.

[0003] In the relevant field, there are existing technologies dedicated to solving the problem of cumulative side clearance of the transmission system, such as the patent document with publication number CN202211351519.5, which discloses a transmission side clearance measuring device and a measuring system. The transmission side clearance measuring device of the present application includes a first bracket for supporting the driving mechanism and the transmission mechanism, a transmission shaft connected to the output end of the transmission mechanism, a second bracket supporting the transmission shaft and an angle measuring mechanism. The present application utilizes the first bracket and the second bracket to realize the stable setting of the driving mechanism, the transmission mechanism and the transmission shaft, improves the stability of the measuring device, and outputs the power of the transmission mechanism to the second bracket through the transmission shaft, and uses the angle detection mechanism to measure the rotation angle of the output shaft of the driving mechanism, so as to obtain the total transmission side clearance of the transmission mechanism according to the rotation angle. Therefore, the present application can realize the measurement of the total transmission side clearance of the transmission mechanism, but the device relies on the transmission shaft to output the power to the second bracket, and uses the angle detection mechanism to measure the rotation angle. This indirect measurement method may introduce additional errors, and the operation of the device is complicated, and the reading of the angle data of the measurement detection result is not intuitive enough. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides an electric vehicle reducer transmission system cumulative backlash angle detection device and its use method, which locks the output end of the reducer through the output locking component, and applies a specified torque by the control and display component to make the input drive component rotate forward and reverse. During the process, the reducer input shaft and the angle measurement component rotate synchronously, which can quickly and accurately detect and display the cumulative backlash angle of the reducer transmission system, and then calculate the system cumulative tooth side clearance. The invented device ensures the accuracy of the measurement data, and the control and display component can display the cumulative backlash angle of the reducer transmission system in real time, which improves the convenience of operation and the readability of data.

[0005] In order to achieve the above-mentioned object, according to one aspect of the present invention, the present invention provides an electric vehicle reducer transmission system cumulative backlash angle detection device, comprising a base plate, an output locking assembly and an input drive assembly mounted thereon through a positioning assembly, an angle measurement assembly, and a control and display assembly, wherein:

[0006] The output locking assembly includes an output bushing, an output spline shaft, a positioning screw with a 60° surface at the bottom, and a hand button fixed to the top of the positioning screw. Rotating the hand button drives the positioning screw to move downward, and the 60° surface of the positioning screw fits with the 60° surface of the output spline shaft to limit the rotation of the output spline shaft, thereby locking the output end of the reducer;

[0007] The angle measurement assembly includes an angle encoder that rotates coaxially with the reducer input shaft;

[0008] The control and display assembly includes a torque wrench, a hand wheel, and a touch screen that displays the accumulated backlash angle;

[0009] The input drive assembly includes a bushing, a connecting shaft, and a coupling, which are connected to the rotating shaft of the angle encoder to form a first rigid connection body; it also includes an input spline sleeve, an input shaft, and a first gear, which are connected to the hand wheel to form a second rigid connection body;

[0010] The inner spline of the input spline sleeve is meshed with the outer spline of the reducer input shaft, and the first gear is meshed with the second gear by pushing and rotating the handwheel; the first rigid connector and the second rigid connector are driven to rotate synchronously by the forward and reverse rotation of the torque wrench. During the process, the reducer input shaft rotates synchronously with the rotating shaft of the angle encoder, and data is recorded by the touch screen to achieve rapid and accurate detection of the accumulated side clearance angle of the reducer transmission system.

[0011] Furthermore, there is a 60° groove divided into five parts on the cylindrical surface of the output spline shaft, which is in contact with the 60° surface of the positioning screw. The output spline shaft passes through the output bushing and is inserted into the spline inner holes of the first differential mechanism planetary gear and the second differential mechanism planetary gear in the reducer. The spline size is made according to the comprehensive through-end gauge size of the spline inner holes of the first differential mechanism planetary gear and the second differential mechanism planetary gear in the reducer; the spline size of the input spline sleeve is made according to the comprehensive through-end gauge size of the reducer input shaft.

[0012] Furthermore, the first rigid connector and the second rigid connector are matched with a small clearance (φd2H6 / g5) to maintain synchronous rotation therebetween.

[0013] Furthermore, the positioning assembly includes a circular positioning pin and a diamond positioning pin, which are fastened to the base plate by screws and cooperate with the mounting pin holes of the reducer to position the reducer on the detection device.

[0014] Furthermore, the output locking assembly also includes an output support fixed on the base plate by the guide key and the screw for providing support, and a positioning bushing installed above the output support for inserting the positioning screw.

[0015] Furthermore, the input drive assembly also includes an input front support and an input rear support fixed on the floor to provide stable support for the entire input drive assembly, and the height difference between the two is ≤0.005mm.

[0016] Furthermore, the input drive assembly also includes a gear shaft fixed to the lower middle portion of the input front support, on which the second gear that rotates freely with high precision is mounted.

[0017] Furthermore, the input drive assembly also includes an input front bushing installed in the top circular hole of the input front support, and an input rear bushing installed in the top circular hole of the input rear support. The bushing is fixedly installed in the input rear bushing, which is provided with a key groove, and the outer periphery of the end portion is covered with a limiting sleeve close to the input rear bushing and fixed by bolts.

[0018] Furthermore, the angle measurement assembly also includes an angle encoder seat for mounting the angle encoder, and both are mounted on the input rear support.

[0019] According to another aspect of the present invention, the present invention provides a method for using a cumulative backlash angle detection device for a transmission system of an electric vehicle reducer, which is implemented by using the cumulative backlash angle detection device for a transmission system of an electric vehicle reducer as described above, and the specific implementation steps are as follows:

[0020] S100: Installation of the reducer: Place the reducer on the detection device, and install it by matching the circular positioning pins and diamond positioning pins on the detection device with the mounting pin holes on the reducer to ensure that the reducer is correctly positioned;

[0021] S200: Installation and locking of the output spline shaft: insert the output spline shaft into the spline inner holes of the first differential mechanism planetary gear and the second differential mechanism planetary gear of the differential mechanism in the reducer through the output bushing; rotate the hand button to move the positioning screw downward, and its 60° surface fits with the 60° surface of the output spline shaft, thereby locking the output spline shaft and limiting the output rotation of the reducer;

[0022] S300: Installation and engagement of input shaft: Insert the input spline sleeve into the input shaft of the reducer by rotating the hand wheel, and ensure that the first gear is engaged with the second gear. Use a torque wrench to twist the second gear in a certain direction to drive the first gear, the gear train in the reducer, the input spline sleeve and the angle encoder to rotate synchronously until they cannot rotate;

[0023] S400: Setting and reading the angle encoder: Set the displayed value of the angle encoder to zero on the touch screen, rotate the torque wrench in the opposite direction, drive all related components to rotate synchronously, until it stops rotating again, read or store the data β on the touch screen, which is the accumulated backlash angle of the reducer transmission system;

[0024] S500: Calculate the cumulative backlash of the transmission system: According to the read angle β, the cumulative backlash of the transmission system is calculated using the formula: cumulative backlash of the transmission system L = β × π / 180 × (Da / 2); Da is the pitch circle diameter of the reducer input shaft;

[0025] S600: Disassembly and reassembly of the reducer: When the reducer needs to be disassembled or reassembled, push the hand wheel backward to disengage the first gear from the second gear, driving the input spline sleeve and the input shaft to slide in the input front bushing and the bushing until the first gear is close to the end face of the limit sleeve; turn the hand button upward to make the 60° surface of the positioning screw withdraw from the output spline shaft, so as to withdraw the output spline shafts on both sides, loosen the circular positioning pin and the diamond positioning pin, and complete the removal of the reducer.

[0026] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0027] 1. The device structure of the present invention is coaxially connected with the input drive component and then meshed with the reducer input shaft. The torque wrench drives the components to rotate synchronously with the specified torque in the forward and reverse rotation. During this process, the input shaft and the angle encoder always rotate synchronously in the forward and reverse direction. The cumulative side clearance angle of the reducer transmission system is quickly displayed through the touch screen, so that the cumulative side clearance angle of the electric vehicle reducer transmission system can be accurately measured. The angle calculation system accumulates the tooth side clearance, thereby improving the detection speed and accuracy.

[0028] 2. The device of the present invention rotates the output spline shafts at both ends to make them mesh with the half-shaft gears of the first differential mechanism planetary gear and the second differential mechanism planetary gear on both sides of the reducer, and then rotates the hand button in the output locking assembly to drive the positioning screw to move, thereby pressing the output spline shaft to lock the output of the reducer. The operation is simple and the work efficiency is improved.

[0029] 3. After being processed by the industrial computer, the data of the angle encoder of the device of the present invention is displayed in real time on the touch screen, so that the operator can obtain the measurement results immediately, thereby improving the convenience of operation and the readability of data.

[0030] 4. The device of the present invention can quantitatively apply a specified rotational torque to the reducer input shaft through a torque wrench, and adjust the torque according to different test requirements, so that the device can adapt to reducers of different models and specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a reducer according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the overall structure of a device for detecting the accumulated backlash angle of a transmission system of an electric vehicle reducer according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the reducer of the embodiment of the present invention installed on the detection device in use;

[0034] Figure 4 This is a schematic diagram of the state of the detection device when installing and removing the reducer according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the working state of the detection device according to an embodiment of the present invention;

[0036] Figure 6 Outputting a large-scale drawing of a support for the detection device of an embodiment of the present invention;

[0037] Figure 7 This is a large-scale drawing of the positioning screw of the detection device according to an embodiment of the present invention;

[0038] Figure 8 Outputting a large-scale drawing of a spline shaft for the detection device of an embodiment of the present invention;

[0039] Fig. 9 Input a front support large-scale drawing for the detection device of the embodiment of the present invention;

[0040] Fig.10 Input a large-scale drawing of a spline sleeve for the detection device of the embodiment of the present invention;

[0041] Fig.11 This is a large-scale drawing of the input shaft of the detection device according to an embodiment of the present invention;

[0042] Fig.12 This is a large-scale drawing of a bushing of a detection device according to an embodiment of the present invention;

[0043] Fig.13 This is a large-scale drawing of the connecting shaft of the detection device according to an embodiment of the present invention;

[0044] Fig.14 This is a large-scale drawing of the angle encoder seat of the detection device according to an embodiment of the present invention;

[0045] Fig.15 This is a large-scale drawing of the bottom plate of the detection device according to an embodiment of the present invention;

[0046] Fig.16 Input a rear support drawing for the detection device of the embodiment of the present invention;

[0047] Fig.17 This is a large-scale drawing of the gear of the detection device according to an embodiment of the present invention;

[0048] Fig.18 This is a large-scale drawing of the gear shaft of the detection device according to an embodiment of the present invention;

[0049] Fig.19 The present invention is a flowchart of a method for using the cumulative backlash angle detection device of a reducer transmission system of an electric vehicle according to an embodiment of the present invention.

[0050] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-base plate, 2-positioning assembly, 201-circular positioning pin, 202-diamond positioning pin, 203-guide key, 3-output locking assembly, 301-output support, 302-output bushing, 303-output spline shaft, 304-positioning bushing, 305-positioning screw, 306-hand button, 4-input drive assembly, 401-input front support, 402-input rear support, 403-gear shaft, 404-first gear, 405-second gear, 406- 6-input front bushing, 407-input rear bushing, 408-input spline sleeve, 409-connecting shaft, 410-bushing, 411-coupling, 412-input shaft, 413-limit sleeve, 5-angle measurement assembly, 501-angle encoder seat, 502-angle encoder, 6-control and display assembly, 601-torque wrench, 602-handwheel, 603-touch screen, 7-reducer, 701-mounting pin hole, 702-first differential mechanism planetary gear, 703-second differential mechanism planetary gear, 704-reducer input shaft. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0053] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0055] like Figure 1 The figure shows a schematic diagram of the reducer structure, which includes a mounting pin hole 701 , a first differential mechanism planetary gear 702 , a second differential mechanism planetary gear 703 and a reducer input shaft 704 .

[0056] like Figure 2 As shown, an embodiment of the present invention provides a device for detecting the cumulative side clearance angle of a reducer transmission system of an electric vehicle, comprising a base plate 1, a positioning assembly 2, an output locking assembly 3, an input drive assembly 4, an angle measurement assembly 5, and a control and display assembly 6. The output locking assembly 3 and the input drive assembly 4 are mounted on the base plate 1 through the positioning assembly 2, and the reducer is mounted on the detection device. The output end of the reducer is locked through the output locking assembly 3, and the control and display assembly 6 applies a prescribed torque to make the input drive assembly 4 rotate forward and reverse. During the process, the reducer input shaft and the angle measurement assembly 5 rotate synchronously, and the cumulative side clearance angle β of the reducer transmission system can be detected and displayed, and the cumulative tooth side clearance of the system can be calculated from β. The reducer input shaft and the angle measurement assembly of the invented device rotate synchronously, ensuring the accuracy of the measurement data, and the control and display assembly can display the cumulative side clearance angle β of the reducer transmission system in real time, which improves the convenience of operation and the readability of data. Among them,

[0057] like Figure 3 As shown in FIG. 1 , it is a schematic diagram of the use state of the reducer installed on the detection device. Further, as Figure 6-18 It is a large-scale drawing of each component, among which,

[0058] The bottom plate 1 is the base of the entire detection device, and all other components are directly or indirectly mounted on the bottom plate;

[0059] The positioning assembly 2 includes a circular positioning pin 201 and a diamond positioning pin 202, which are fastened to the base plate 1 by screws and respectively cooperate with the two mounting pin holes 701 of the reducer to be detected, so that the reducer is positioned on the detection device;

[0060] The output locking assembly 3 includes an output support 301, an output bushing 302, an output spline shaft 303, a positioning bushing 304, a positioning screw 305 and a hand button 306. These components realize the locking function of the output end of the reducer to be detected through a specific connection and matching method, wherein:

[0061] The two output supports 201 are fixed on the base plate 1 by the guide key 203 and screws. The guide key 203 ensures the accurate positioning of the output support 301 during the installation process, and provides certain guiding and supporting functions. The four output bushings 302 are respectively installed on both sides of the output support 301. The two output spline shafts 303 are respectively inserted into the spline inner holes of the first differential mechanism planetary gear 702 and the second differential mechanism planetary gear 703 in the reducer to be inspected through the two output bushings 302. There are five equally divided 60° grooves on the cylindrical surface of the output spline shaft 303. The spline size is made according to the comprehensive through-end gauge size of the spline inner holes of the first differential mechanism planetary gear 702 and the second differential mechanism planetary gear 703 in the reducer 7; the positioning bushings 304 are respectively installed on the top of the two output supports 301. The positioning screw 305 is screwed into the positioning bushing 304, and the hand button 306 is fixed to the top of the positioning screw 305 by a pin. The bottom end of the positioning screw 305 is a 60° surface that can be engaged with the 60° groove of the output spline shaft 303. Rotating the hand button 306 drives the positioning screw 305 to move up and down. When locked, the hand button 306 drives the positioning screw 305 to move downward. The 60° surface of the positioning screw 305 fits with the 60° surface of the output spline shaft 303, limiting the rotation of the output spline shaft 303, thereby limiting the rotation of the output in the reducer to be tested. At this time, the device should ensure that the two output spline shafts 303 are coaxial with the first differential mechanism planetary gear 702 half-shaft gear and the second differential mechanism planetary gear 703 half-shaft gear spline inner hole of the reducer, and the coaxiality is not greater than φ0.015mm.

[0062] The angle measuring assembly 5 comprises an angle encoder seat 501 and an angle encoder 502 connected with a cable mounted thereon, and both are mounted on the input rear support 402;

[0063] The control and display assembly 6 includes a torque wrench 601, a hand wheel 602, a touch screen 603 connected with a cable, and an industrial computer;

[0064] The input drive assembly 4 includes an input front support 401, an input rear support 402, a gear shaft 403, a first gear 404, a second gear 405, an input front bushing 406, an input rear bushing 407, an input spline sleeve 408, a connecting shaft 409, a bushing 410, a coupling 411, an input shaft 412 and a limit sleeve 413.

[0065] The input front support 401 and the input rear support 402 are fixedly mounted on the bottom plate 1 by the guide key 302 and screws, and the height difference between the two is ≤0.005mm, providing stable support and precise positioning for the entire input drive assembly 4.

[0066] One end of the gear shaft 403 is fixed in a hole in the lower middle part of the input front support 401 by a screw, and the other end is installed with the second gear 405 and an elastic retaining ring is provided at the end contact position. The second gear 405 can rotate freely with high precision on the gear shaft 403, allowing the second gear 405 to rotate under the action of the torque wrench 601, thereby driving the entire input drive assembly 4; the input front bushing 406 is installed in the top circular hole of the input front support 401 and fixed by bolts, and the input rear bushing 407 is installed in the top circular hole of the input rear support 402 and fixed by bolts, providing a guiding effect for related components.

[0067] The bushing 410 is installed through the input rear bushing 407 and is provided with a keyway. One end of the bushing is connected to the connecting shaft 409 by a key and a screw. The coupling 411 connects the connecting shaft 409 with the rotating shaft of the angle encoder 502. The other end of the bushing 410 is sleeved with the limit sleeve 413 on the outer periphery and fixed by bolts. The bushing 410 is close to the input rear bushing 407. The bushing 410, the connecting shaft 409, the coupling 411 and the rotating shaft of the angle encoder 502 are fastened together by keys and screws to form a first rigid connector installed on the input rear support 402 to ensure precise coaxiality and synchronous rotation.

[0068] The input spline sleeve 408 passes through the input front bushing 406, and one end can be connected with the reducer input shaft 704 of the reducer. The spline size is made according to the comprehensive through-end gauge size of the reducer input shaft 704 to ensure that the two can mesh correctly. The other end is connected to the input shaft 412 through a key and a screw. The input shaft 412 passes through the first gear 404 and the handwheel 602 and is fastened as a whole through a key and a screw. Both ends are installed and fixed in the input front bushing 406 and the bushing 410. The first gear 404 and the second gear 405 have the same module and number of teeth to ensure that the torque value applied thereto is correctly transmitted.

[0069] The input spline sleeve 408, the input shaft 412, the first gear 404 and the hand wheel 602 are connected together by keys and screws to form a second rigid connection body, ensuring that the rotation of the hand wheel 602 can be transmitted to the reducer input shaft. At this time, the device should ensure that the input spline sleeve 408 is coaxial with the reducer input shaft 704 of the reducer and the coaxiality is not greater than φ0.015mm.

[0070] The first rigid connector and the second rigid connector adopt a small clearance fit (φd2H6 / g5) to maintain synchronous rotation between the two while allowing a certain degree of assembly and operation flexibility. The torque is transmitted through the fit of the key and the keyway, so that the rotating shaft of the angle encoder 501 rotates synchronously with the input spline sleeve 408, the first gear 404 and the reducer input shaft 704.

[0071] In the detection device of this embodiment, the hand wheel 602 and the first gear 404 can only move between the input front bushing 406 and the limit sleeve 413.

[0072] like Figure 4 As shown, when the detection device is installing or unloading the reducer, the hand wheel 602 is pushed backward, the first gear 404 is disengaged from the second gear 405, and the input spline sleeve 408 and the input shaft 409 are driven to slide in the input front bushing 406 and the bushing 410 until the first gear 404 is close to the end face of the limit sleeve 413; the hand button 306 of the output locking assembly 3 is screwed upward until the 60° surface of the positioning screw 305 exits the output spline shaft 303, and the output spline shafts 303 on both sides are exited.

[0073] like Figure 5 As shown, when the detection device is working, the output spline shaft 303 is pushed forward and rotated, so that the output spline shaft 303 is respectively meshed with the half-shaft gears of the first differential mechanism planetary gear 702 and the second differential mechanism planetary gear 703 on both sides of the reducer, and the hand button 306 is screwed downward until the 60° surface of the positioning screw 305 presses the 60° surface of the output spline shaft 303, at this time, the output of the reducer is locked; the hand wheel 602 is pushed forward and rotated to drive the input spline sleeve 408, the input shaft 409, and slide in the input front bushing 406 and the bushing 410 until the hand wheel 602 is close to the end face of the input front bushing 406, at this time, the inner spline of the input spline sleeve 408 is meshed with the outer spline of the reducer input shaft 704, and the first gear 404 is meshed with the second gear 405. During the forward and backward movement of the handwheel 602, the key fastened on the input shaft 412 is always in the keyway of the bushing 410, and the key and the keyway are matched with b H5 / g6 (b is the nominal size of the key and keyway width), which drive the reducer input shaft 704, the input spline sleeve 408, the first gear 404, the input shaft 412, the bushing 410, the connecting shaft 409, and the rotating shaft of the angle encoder 502 to rotate synchronously.

[0074] After the input spline sleeve 408 is meshed with the reducer input shaft 704, the torque wrench 601 with the specified torque is used to drive the second gear 405 to rotate in a certain direction until it stops rotating, and the displayed value is set to zero on the touch screen 603; then the torque wrench 601 is rotated in the opposite direction to drive the reducer input shaft 704, the input spline sleeve 408, the first gear 404, the input shaft 412, the bushing 410, the connecting shaft 409, and the rotating shaft of the angle encoder 502 to rotate synchronously until it stops rotating, and the data on the touch screen is recorded or stored, which is the cumulative backlash angle β of the reducer transmission system. Based on this angle, the cumulative backlash of the transmission system can be calculated. The cumulative backlash L of the transmission system is:

[0075] L = β × π / 180 × (Da / 2);

[0076] Among them, β is the cumulative backlash angle of the reducer transmission system, and Da is the pitch circle diameter of the reducer input shaft.

[0077] Combination Figure 1-18 ,like Fig.19 As shown, the present invention provides a method for using a cumulative backlash angle detection device for an electric vehicle reducer transmission system, which can quickly and accurately detect the cumulative backlash angle of the reducer transmission system, thereby evaluating the performance of the reducer. The following are specific implementation steps of the detection device:

[0078] S100: Installation of the reducer: Place the reducer on the detection device, and install it by matching the circular positioning pins and diamond positioning pins on the detection device with the mounting pin holes on the reducer to ensure that the reducer is correctly positioned.

[0079] S200: Installation and locking of the output spline shaft: insert the output spline shaft into the spline inner holes of the first differential mechanism planetary gear and the second differential mechanism planetary gear of the differential mechanism in the reducer through the output bushing; rotate the hand button to move the positioning screw downward, and its 60° surface fits with the 60° surface of the output spline shaft, thereby locking the output spline shaft and limiting the output rotation of the reducer.

[0080] S300: Installation and engagement of input shaft: Insert the input spline sleeve into the input shaft of the reducer by rotating the hand wheel, and ensure that the first gear is engaged with the second gear. Use a torque wrench to turn the second gear in a certain direction to drive the first gear, the gear train in the reducer, the input spline sleeve and the angle encoder to rotate synchronously until they can no longer rotate.

[0081] S400: Setting and reading the angle encoder: Set the displayed value of the angle encoder to zero on the touch screen, rotate the torque wrench in the opposite direction, and drive all related components to rotate synchronously until they cannot rotate again. Read or store the data β on the touch screen, which is the accumulated backlash angle of the reducer transmission system.

[0082] S500: Calculate the cumulative backlash of the transmission system: According to the read angle β, use the formula: cumulative backlash of the transmission system L = β × π / 180 × (Da / 2) to calculate the cumulative backlash of the transmission system, where Da is the pitch circle diameter of the reducer input shaft.

[0083] S600: Disassembly and reassembly of the reducer: When the reducer needs to be disassembled or reassembled, push the hand wheel backward to disengage the first gear from the second gear, driving the input spline sleeve and the input shaft to slide in the input front bushing and the bushing until the first gear is close to the end face of the limit sleeve; turn the hand button upward to make the 60° surface of the positioning screw withdraw from the output spline shaft, so as to withdraw the output spline shafts on both sides, loosen the circular positioning pin and the diamond positioning pin, and complete the removal of the reducer.

[0084] Through the above steps, the detection device can efficiently detect the cumulative backlash angle of the reducer transmission system for electric vehicles, providing an accurate and reliable method for the performance evaluation of the reducer. The design of the device takes into account the simplicity of operation and the accuracy of measurement, and is suitable for rapid detection on the production line, which helps to improve production efficiency and product quality.

[0085] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting the accumulated backlash angle of a transmission system of an electric vehicle reducer, characterized in that: It comprises a base plate (1), an output locking assembly (3) and an input drive assembly (4) mounted thereon via a positioning assembly (2), an angle measuring assembly (5) and a control and display assembly (6), wherein: The output locking assembly (3) comprises an output bushing (302), an output spline shaft (303), a positioning screw (305) with a 60° surface at the bottom, and a hand button (306) fixed to the top of the positioning screw (305); the hand button (306) is rotated to drive the positioning screw (305) to move downward, and the 60° surface of the positioning screw (305) is fitted with the 60° surface of the output spline shaft (303), thereby limiting the rotation of the output spline shaft (303), thereby locking the output end of the reducer (7); The angle measurement assembly (5) comprises an angle encoder (502) that rotates coaxially with the reducer input shaft (704); The control and display assembly (6) comprises a torque wrench (601), a hand wheel (602) and a touch screen (603) for displaying the accumulated backlash angle; The input drive assembly (4) comprises a bushing (410), a connecting shaft (409), and a coupling (411), which are connected to the rotating shaft of the angle encoder (502) to form a first rigid connection body; it also comprises an input spline sleeve (408), an input shaft (409), and a first gear (404), which are connected to the hand wheel (602) to form a second rigid connection body; By pushing and rotating the hand wheel (602), the internal spline of the input spline sleeve (408) is meshed with the external spline of the reducer input shaft (704), and the first gear (404) is meshed with the second gear (405); the first rigid connection body and the second rigid connection body are driven to rotate synchronously by the forward and reverse rotation of the torque wrench (601). During the process, the reducer input shaft (704) and the rotating shaft of the angle encoder (502) rotate synchronously, and data is recorded through the touch screen (603), so as to realize rapid and accurate detection of the accumulated backlash angle of the reducer transmission system.

2. According to claim 1, a device for detecting the accumulated backlash angle of a transmission system of an electric vehicle reducer, characterized in that: The cylindrical surface of the output spline shaft (303) is provided with a 60° groove divided into five equal parts and fitted with the 60° surface of the positioning screw (305). The output spline shaft (303) passes through the output bushing (302) and is inserted into the spline inner holes of the first differential mechanism planetary gear (702) and the second differential mechanism planetary gear (703) in the reducer (7). The spline size is made according to the comprehensive through-end gauge size of the spline inner holes of the first differential mechanism planetary gear (702) and the second differential mechanism planetary gear (703) in the reducer (7); the spline size of the input spline sleeve (408) is made according to the comprehensive through-end gauge size of the reducer input shaft (704).

3. According to claim 1, a cumulative backlash angle detection device for a transmission system of an electric vehicle reducer is characterized in that: The first rigid connection body and the second rigid connection body are matched with a small clearance (φd2 H6 / g5) to maintain synchronous rotation between the two.

4. The device for detecting the accumulated backlash angle of a transmission system of an electric vehicle reducer according to any one of claims 1 to 3, characterized in that: The positioning assembly (2) comprises a circular positioning pin (201) and a diamond positioning pin (202), which are fastened to the base plate (2) by means of screws and cooperate with the mounting pin hole (701) of the reducer (7) to position the reducer (7) on the detection device.

5. The device for detecting the accumulated backlash angle of the electric vehicle reducer transmission system according to any one of claims 1 to 3, characterized in that: The output locking assembly (3) also includes an output support (301) fixed on the base plate (1) by means of the guide key (203) and screws for providing support, and a positioning sleeve (304) installed above the output support (301) for inserting the positioning screw (305).

6. The device for detecting the accumulated backlash angle of a transmission system of an electric vehicle reducer according to any one of claims 1 to 3, characterized in that: The input drive assembly (4) further comprises an input front support (401) and an input rear support (402) fixed on the floor (1) to provide stable support for the entire input drive assembly (4), and the height difference between the two is ≤0.005 mm.

7. The device for detecting the accumulated backlash angle of the electric vehicle reducer transmission system according to claim 6, characterized in that: The input drive assembly (4) further comprises a gear shaft (403) fixed to the lower middle portion of the input front support (401), on which the second gear (405) which rotates freely with high precision is mounted.

8. The device for detecting the accumulated backlash angle of the electric vehicle reducer transmission system according to claim 7, characterized in that: The input drive assembly (4) further comprises an input front bushing (406) installed in the top circular hole of the input front support (401), and an input rear bushing (407) installed in the top circular hole of the input rear support (402), wherein the bushing (410) is fixedly installed in the input rear bushing (407) and is provided with a keyway, and a limiting sleeve (413) is sleeved on the outer periphery of the end thereof and is closely attached to the input rear bushing (407) and fixed by bolts.

9. The device for detecting the accumulated backlash angle of a transmission system of an electric vehicle reducer according to any one of claims 1 to 3, characterized in that: The angle measurement assembly (5) further comprises an angle encoder seat (501) for mounting the angle encoder (502), and both are mounted on the input rear support (402).

10. A method for using a cumulative backlash angle detection device for a transmission system of an electric vehicle reducer, which is implemented by using the cumulative backlash angle detection device for a transmission system of an electric vehicle reducer as claimed in any one of claims 1 to 9, characterized in that: The specific steps include: S100: Installation of the reducer: Place the reducer on the detection device, and install it by matching the circular positioning pins and diamond positioning pins on the detection device with the mounting pin holes on the reducer to ensure that the reducer is correctly positioned; S200: Installation and locking of the output spline shaft: insert the output spline shaft into the spline inner holes of the first differential mechanism planetary gear and the second differential mechanism planetary gear of the differential mechanism in the reducer through the output bushing; rotate the hand button to move the positioning screw downward, and its 60° surface fits with the 60° surface of the output spline shaft, thereby locking the output spline shaft and limiting the output rotation of the reducer; S300: Installation and engagement of input shaft: Insert the input spline sleeve into the input shaft of the reducer by rotating the hand wheel, and ensure that the first gear is engaged with the second gear. Use a torque wrench to twist the second gear in a certain direction to drive the first gear, the gear train in the reducer, the input spline sleeve and the angle encoder to rotate synchronously until they cannot rotate; S400: Setting and reading the angle encoder: Set the displayed value of the angle encoder to zero on the touch screen, rotate the torque wrench in the opposite direction, drive all related components to rotate synchronously, until it stops rotating again, read or store the data β on the touch screen, which is the accumulated backlash angle of the reducer transmission system; S500: Calculate the cumulative backlash of the transmission system: According to the read angle β, the cumulative backlash of the transmission system is calculated using the formula: cumulative backlash of the transmission system L = β × π / 180 × (Da / 2); Da is the pitch circle diameter of the reducer input shaft; S600: Disassembly and reassembly of the reducer: When the reducer needs to be disassembled or reassembled, push the hand wheel backward to disengage the first gear from the second gear, driving the input spline sleeve and the input shaft to slide in the input front bushing and the bushing until the first gear is close to the end face of the limit sleeve; turn the hand button upward to make the 60° surface of the positioning screw withdraw from the output spline shaft, so as to withdraw the output spline shafts on both sides, loosen the circular positioning pin and the diamond positioning pin, and complete the removal of the reducer.

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