Differential gear backlash dynamic measuring device

Abstract

The utility model discloses a differential gear backlash dynamic measuring device, which relates to the technical field of differential gear detection, and comprises a frame, a fixing unit and a pair of measuring units, the fixing unit is used for fixing a shell of a differential gear, and the pair of measuring units are oppositely arranged above and below the fixing unit. Each measuring unit comprises a mounting rack, an expansion shaft mechanism, a driving mechanism and a measuring mechanism, the mounting rack has a moving stroke in the vertical direction, the expansion shaft mechanism is rotatably mounted on the mounting rack and used for tensioning a corresponding half axle gear in a differential mechanism, and the measuring mechanism comprises a circular grating reading head and a circular grating disc which are oppositely arranged; wherein the driving mechanism of one measuring unit is used for driving the expansion shaft mechanism to rotate, and the driving mechanism of the other measuring unit is used for enabling the expansion shaft mechanism to load reverse torque force; according to the technical scheme provided by the utility model, the technical effect of dynamically measuring the gear backlash of the differential mechanism is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of differential detection, in particular to a differential tooth side clearance dynamic measurement device. Background Art

[0002] During the differential assembly process, the measurement of the differential tooth side clearance is a very important step. At present, the differential tooth side clearance measurement device is usually a static measurement, that is, the half-shaft gear on one side is fixed, and the half-shaft gear on the other side is driven to rotate forward and reversely to measure a set of tooth side clearance. However, each tooth of the half-shaft gear in the differential will mesh with each tooth of the planetary gear on both sides, and the gap between the two teeth that mesh each time is different. Static measurement cannot measure the gap corresponding to each tooth of the half-shaft gear and the planetary gear, and the result is single and imperfect. Utility Model Content

[0003] The main purpose of the utility model is to provide a dynamic measurement device for differential tooth side clearance, aiming to solve the problem that the differential tooth side clearance measurement device in the prior art is static measurement, cannot detect the clearance corresponding to each tooth of the half-shaft gear and the planetary gear, and the result is single and imperfect.

[0004] In order to achieve the above-mentioned purpose, the differential gear tooth backlash dynamic measurement device proposed by the utility model comprises:

[0005] frame;

[0006] a fixing unit, disposed on the frame, for fixing the housing of the differential; and

[0007] A pair of measuring units are arranged on the frame relatively and are respectively located above and below the fixed unit; each of the measuring units includes a mounting frame, an expansion mechanism, a driving mechanism and a measuring mechanism, the mounting frame is movably mounted on the frame and has a movable stroke in the up and down directions; the expansion mechanism is rotatably mounted on the mounting frame to tighten the corresponding half-shaft gear in the differential; the driving mechanism is arranged on the mounting frame and connected to the expansion mechanism; the measuring mechanism includes a circular grating reading head and a circular grating disk arranged relatively, the circular grating reading head is arranged on the mounting frame, and the circular grating disk is arranged on the expansion mechanism;

[0008] The driving mechanism of one of the measuring units is used to drive the shaft expansion mechanism to rotate, and the driving mechanism of the other measuring unit is used to load the shaft expansion mechanism with a reverse torque force.

[0009] In one embodiment, each of the shaft expansion mechanisms includes an expansion sleeve and a core shaft, the expansion sleeve is rotatably mounted on the mounting frame, and the core shaft is movably mounted in the expansion sleeve and has a movable stroke in an up-and-down direction relative to the expansion sleeve.

[0010] In one embodiment, each of the shaft expansion mechanisms further includes a first cylinder, which is disposed on the mounting frame and is used to drive the core shaft to move in an up-and-down direction.

[0011] In one embodiment, the shaft expansion mechanism further includes an outer sleeve and an inner sleeve, the inner sleeve is sleeved outside the core shaft, the outer sleeve is sleeved outside the inner sleeve, the outer sleeve is rotatably mounted on the mounting frame, and the expansion sleeve is arranged at one end of the inner sleeve close to the fixing unit and is located outside the outer sleeve; wherein:

[0012] The inner side wall of the outer sleeve is provided with a plurality of first semicircular grooves along the circumferential direction, and the outer side wall of the inner sleeve is provided with a plurality of second semicircular grooves corresponding to the plurality of first semicircular grooves, and a ball is installed in each of the first semicircular grooves and the corresponding second semicircular groove; and / or,

[0013] A spring is sleeved between the inner sleeve and the outer sleeve, and two ends of the spring are respectively connected to the inner sleeve and the outer sleeve.

[0014] In one embodiment, the driving mechanism includes a motor and a transmission assembly, the motor is disposed on the mounting frame, and the output shaft of the motor is transmission-connected to the outer sleeve through the transmission assembly.

[0015] In one embodiment, the transmission assembly includes a first pulley, a second pulley and a poly-V belt, the first pulley is fixedly mounted on the output shaft of the motor, the second pulley is fixedly mounted on the outer sleeve, and the poly-V belt is stretched on the first pulley and the second pulley.

[0016] In one embodiment, a connecting bearing is provided at one end of the inner sleeve away from the fixing unit, and the inner ring of the connecting bearing is connected to the inner sleeve; the measuring unit also includes a fine-tuning mechanism, and the fine-tuning mechanism includes an electric cylinder, a support and a seesaw, the electric cylinder is arranged on the mounting frame, the support is arranged on the mounting frame and is located between the electric cylinder and the shaft expansion mechanism, the seesaw is hinged to the support to form a fulcrum, and the two ends of the seesaw are respectively connected to the output end of the electric cylinder and the outer ring of the bearing.

[0017] In one embodiment, the distance from the fulcrum to the output end of the electric cylinder is equal to the distance from the fulcrum to the axis of the inner sleeve.

[0018] In one embodiment, the fixing unit includes a fixing platform, a pressure plate and a second cylinder. The fixing platform is arranged on the frame and is provided with a positioning hole for placing the differential. The pressure plate is movably installed above the fixing platform. The second cylinder is arranged on the frame to drive the pressure plate to move up and down to fix the housing of the differential.

[0019] In the technical solution of the utility model, a driving mechanism and a measuring mechanism are arranged on each shaft expansion mechanism, and the two shaft expansion mechanisms can respectively tighten and connect the two half-shaft gears, wherein the driving mechanism of one shaft expansion mechanism drives the corresponding shaft expansion mechanism to drive the half-shaft gears to rotate, and the driving mechanism of the other shaft expansion mechanism outputs a reverse torque force as a load, and the half-shaft gears of the other shaft expansion mechanism are passively rotated, the half-shaft gears are always subjected to force, and the meshing state is stable; when measuring, the driving mechanism of one shaft expansion mechanism drives the corresponding half-shaft gear to rotate in the positive direction and the reverse direction, and in the process of rotating in the positive direction and the reverse direction, the circular grating reading heads of the two measuring mechanisms read the rotation angle value of the corresponding half-shaft gear through the circular grating disk on the corresponding shaft expansion mechanism, When the half-axle gear corresponding to one of the shaft expansion mechanisms rotates in the positive direction and the reverse direction, two angular values ​​with deviations can be matched with the half-axle gear corresponding to the other shaft expansion mechanism at the same angular position, and the deviation of the two angular values ​​is the tooth side clearance of the differential at the angle; and, one circle of rotation in the positive direction and one circle of rotation in the reverse direction are regarded as a measurement circle number, so that the measurement circle number reaches the lowest common multiple of the sum of the number of teeth of the two half-axle gears in the differential, and the complete tooth side clearance data of the differential (the clearance data corresponding to each tooth of the half-axle gear and each tooth of the planetary gear) can be measured; the technical solution of the utility model can realize the dynamic measurement of the tooth side clearance of the differential, and can measure the clearance corresponding to each tooth of the half-axle gear and each tooth of the planetary gear, and the result is more complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of an embodiment of a differential gear tooth side clearance dynamic measurement device provided by the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the measuring unit;

[0023] Figure 3 for Figure 2 A schematic diagram of the structure of a cross section;

[0024] Figure 4 for Figure 2 A schematic diagram of the structure of another section;

[0025] Figure 5 for Figure 1 Schematic diagram of the structure of the fixed unit.

[0026] Description of Figure Numbers:

[0027] 1000. Dynamic measuring device for differential gear tooth side clearance; 1. Frame; 2. Fixing unit; 21. Pressure plate; 22. Second cylinder; 3. Measuring unit; 31. Mounting frame; 32. Shaft expansion mechanism; 321. Expansion sleeve; 322. Mandrel; 323. First cylinder; 324. Outer sleeve; 325. Inner sleeve; 326. Spring; 33. Driving mechanism; 331. Motor; 332. First pulley; 333. Second pulley; 334. Multi-V belt; 34. Measuring mechanism; 341. Circular grating reading head; 342. Circular grating disk; 35. Fine-tuning mechanism; 351. Electric cylinder; 352. Support; 353. Rocker.

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0032] During the differential assembly process, the measurement of the differential tooth side clearance is a very important step. At present, the differential tooth side clearance measurement device is usually a static measurement, that is, the half-shaft gear on one side is fixed, and the half-shaft gear on the other side is driven to rotate forward and reversely to measure a set of tooth side clearance. However, each tooth of the half-shaft gear in the differential will mesh with each tooth of the planetary gear on both sides, and the gap between the two teeth that mesh each time is different. Static measurement cannot measure the gap corresponding to each tooth of the half-shaft gear and the planetary gear, and the result is single and imperfect.

[0033] In view of this, the utility model proposes a differential gear side clearance dynamic measurement device, which realizes the dynamic measurement of the differential gear side clearance and can measure the clearance corresponding to each tooth of the half-shaft gear and each tooth of the planetary gear, so that the result is more perfect. Figure 1 A schematic structural diagram of an embodiment of a differential gear tooth side clearance dynamic measurement device provided by the utility model; Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the measuring unit; Figure 3 for Figure 2 A schematic diagram of the structure of a cross section; Figure 4 for Figure 2 A schematic diagram of the structure of another section; Figure 5 for Figure 1 Schematic diagram of the structure of the fixed unit.

[0034] See also Figures 1 to 4In one embodiment of the utility model, a dynamic measuring device 100 for differential gear tooth side clearance includes a frame 1, a fixing unit 2 and a pair of measuring units 3. The fixing unit 2 is arranged on the frame 1 to fix the housing of the differential. The pair of measuring units 3 are relatively arranged on the frame 1 and are respectively located above and below the fixing unit 2. Each of the measuring units 3 includes a mounting frame 31, an expansion shaft mechanism 32, a driving mechanism 33 and a measuring mechanism 34. The mounting frame 31 is movably mounted on the frame 1 and has a movable stroke in the up and down directions. The expansion shaft mechanism 32 is rotatably mounted on the frame 1. The mounting frame 31 is used to tighten the corresponding half-axle gear in the differential; the driving mechanism 33 is arranged on the mounting frame 31 and connected to the shaft expansion mechanism 32; the measuring mechanism 34 includes a circular grating reading head 341 and a circular grating disk 342 arranged opposite to each other, the circular grating reading head 341 is arranged on the mounting frame 31, and the circular grating disk 342 is arranged on the shaft expansion mechanism 32; the driving mechanism 33 of one of the measuring units 3 is used to drive the shaft expansion mechanism 32 to rotate, and the driving mechanism 33 of the other measuring unit 3 is used to load the shaft expansion mechanism 32 with reverse torque.

[0035] In the technical solution of the utility model, a driving mechanism 33 and a measuring mechanism 34 are arranged on each shaft expansion mechanism 32, and the two shaft expansion mechanisms 32 can respectively tighten and connect the two half-shaft gears, wherein the driving mechanism 33 of one shaft expansion mechanism 32 drives the corresponding shaft expansion mechanism 32 to drive the half-shaft gear to rotate, and the driving mechanism 33 of the other shaft expansion mechanism 32 outputs a reverse torque force as a load, and the half-shaft gear of the other shaft expansion mechanism 32 is passively rotated, the half-shaft gear is always subjected to force, and the meshing state is stable; when measuring, the driving mechanism 33 of one shaft expansion mechanism 32 drives the corresponding half-shaft gear to rotate in the positive direction and the reverse direction, and in the process of rotating in the positive direction and the reverse direction, the circular grating reading heads 341 of the two measuring mechanisms 34 pass through the circular grating disk 34 on the corresponding shaft expansion mechanism 32 2 reads the rotation angle value of the corresponding half-shaft gear, when the half-shaft gear corresponding to one shaft expansion mechanism 32 rotates in the positive direction and the reverse direction, two rotation angle values ​​with deviations can be matched with the half-shaft gear corresponding to the other shaft expansion mechanism 32 at the same rotation angle position, and the deviation of the two rotation angle values ​​is the tooth side clearance of the differential at the rotation angle; and, one rotation in the positive direction and one rotation in the reverse direction are regarded as a measurement circle number, so that the measurement circle number reaches the lowest common multiple of the sum of the number of teeth of the two half-shaft gears in the differential, and the complete tooth side clearance data of the differential (the clearance data corresponding to each tooth of the half-shaft gear and each tooth of the planetary gear) can be measured; the technical solution of the utility model can realize the dynamic measurement of the tooth side clearance of the differential, and can measure the clearance corresponding to each tooth of the half-shaft gear and each tooth of the planetary gear, and the result is more perfect.

[0036] It can be understood that when the driving mechanism 33 of one shaft expansion mechanism 32 drives the corresponding half-shaft gear to rotate in the positive direction or the reverse direction, the driving mechanism 33 of the other shaft expansion mechanism 32 outputs the corresponding reverse torque as the load; when measuring, the method of first rotating in the positive direction and then rotating in the reverse direction can be adopted, or the method of first rotating in the reverse direction and then rotating in the positive direction can be adopted; the differential tooth side clearance dynamic measurement device 100 may also include a control unit for controlling the action of the fixing unit 2, the shaft expansion mechanism 32 and the driving mechanism 33, so as to facilitate operation; the differential tooth side clearance dynamic measurement device 100 may also include a host computer for collecting, analyzing and storing data, so as to improve the efficiency of measurement.

[0037] In the embodiment of the utility model, each of the shaft expansion mechanisms 32 includes an expansion sleeve 321 and a core shaft 322. The expansion sleeve 321 is rotatably mounted on the mounting frame 31, and the core shaft 322 is movably mounted in the expansion sleeve 321, and has a movable stroke in the up-down direction relative to the expansion sleeve 321. The expansion sleeve 321 is tightened or loosened by moving the core shaft 322 in the up-down direction, and the structure is simple and easy to operate.

[0038] In an embodiment of the utility model, each of the shaft expansion mechanisms 32 further includes a first cylinder 323, which is disposed on the mounting frame 31 and is used to drive the core shaft 322 to move in the up-down direction. The movement of the core shaft 322 in the up-down direction is controlled by the movement of the piston rod of the first cylinder 323, which is easy to operate and convenient to control. It can be understood that the first cylinder 323 does not interfere with the rotation of the core shaft 322 and the expansion sleeve 321; further, the free end of the piston rod of the first cylinder 323 can abut against the core shaft 322, and a disc spring can be disposed between the core shaft 322 and the free end of the piston rod of the first cylinder 323, so that the movement of the core shaft 322 in the up-down direction is more stable and gentle. In addition, the output force can be adjusted by adjusting the disc spring.

[0039] In an embodiment of the utility model, the expansion shaft mechanism 32 also includes an outer sleeve 324 and an inner sleeve 325, the inner sleeve 325 is sleeved on the outside of the core shaft 322, the outer sleeve 324 is sleeved on the outside of the inner sleeve 325, the outer sleeve 324 is rotatably mounted on the mounting frame 31, and the expansion sleeve 321 is arranged at one end of the inner sleeve 325 close to the fixed unit 2 and is located outside the outer sleeve 324; wherein, the inner side wall of the outer sleeve 324 is provided with a plurality of first semicircular grooves along the circumferential direction, and the outer side wall of the inner sleeve 325 is provided with a plurality of second semicircular grooves corresponding to the plurality of first semicircular grooves, and a ball is installed in each of the first semicircular grooves and the corresponding second semicircular grooves. The expansion sleeve 321 and the core shaft 322 are installed on the mounting frame 31 by using the inner sleeve 325 and the outer sleeve 324. The inner sleeve 325 and the outer sleeve 324 are matched by multiple ball clearances arranged in the circumferential direction to ensure the horizontal floating of the expansion sleeve 321 and the core shaft 322, which can avoid the influence of the coaxial error of the two half-shaft gears of the differential within a certain range on the measurement result, which is beneficial to improve the accuracy of the measurement.

[0040] It can be understood that the mounting frame 31 can be provided with a mounting hole, a mounting tube is fixed in the mounting hole, the shaft expansion mechanism 32 is located in the mounting tube, and the outer sleeve 324 is rotatably connected to the mounting tube through a bearing; the circular grating disk 341 is arranged at the end of the mounting tube, and the circular grating reading head 342 is correspondingly arranged at the end of the outer sleeve 324.

[0041] In an embodiment of the utility model, the expansion shaft mechanism 32 also includes an outer sleeve 324 and an inner sleeve 325, the inner sleeve 325 is sleeved on the outside of the core shaft 322, the outer sleeve 324 is sleeved on the outside of the inner sleeve 325, the outer sleeve 324 is rotatably mounted on the mounting frame 31, and the expansion sleeve 321 is arranged at one end of the inner sleeve 325 close to the fixed unit 2 and is located outside the outer sleeve 324; wherein a spring 326 is sleeved between the inner sleeve 325 and the outer sleeve 324, and the two ends of the spring 326 are respectively connected to the inner sleeve 325 and the outer sleeve 324. The expansion sleeve 321 and the mandrel 322 are mounted on the mounting frame 31 by using the inner sleeve 325 and the outer sleeve 324. The vertical floating property of the expansion sleeve 321 and the mandrel 322 is ensured by the spring 326 between the inner sleeve 325 and the outer sleeve 324, so that an additional axial tension can be applied to the half-shaft gear more accurately, which is beneficial to improve the measurement accuracy. It can be understood that the spring 326 is located between the inner sleeve 325 and the outer sleeve 324, and is sleeved outside the inner sleeve 325.

[0042] In an embodiment of the utility model, the shaft expansion mechanism 32 also includes an outer sleeve 324 and an inner sleeve 325, the inner sleeve 325 is sleeved on the outside of the core shaft 322, the outer sleeve 324 is sleeved on the outside of the inner sleeve 325, the outer sleeve 324 is rotatably mounted on the mounting frame 31, and the expansion sleeve 321 is arranged at one end of the inner sleeve 325 close to the fixing unit 2 and is located outside the outer sleeve 324; wherein, the inner side wall of the outer sleeve 324 is provided with a plurality of first semicircular grooves along the circumferential direction, and the outer side wall of the inner sleeve 325 corresponds to a plurality of the first semicircular grooves. A plurality of second semicircular grooves are arranged in the first semicircular groove, and balls are installed in each of the first semicircular grooves and the corresponding second semicircular grooves; a spring 326 is arranged between the inner sleeve 325 and the outer sleeve 324, and the two ends of the spring 326 are respectively connected to the inner sleeve 325 and the outer sleeve 324; the horizontal floating property of the expansion sleeve 321 and the core shaft 322 is ensured by a plurality of balls arranged circumferentially between the inner sleeve 325 and the outer sleeve 324, and the vertical floating property of the expansion sleeve 321 and the core shaft 322 is ensured by the spring 326, which can further improve the measurement accuracy.

[0043] In the embodiment of the utility model, the driving mechanism 33 includes a motor 331 and a transmission assembly, the motor 331 is arranged on the mounting frame 31, and the output shaft of the motor 331 is transmission-connected to the outer sleeve 324 through the transmission assembly. The motor 331 is connected to the outer sleeve 324 through the transmission assembly, which is convenient for installation, and the motor 331 outputs a forward speed or a reverse torsional force, which is easy to operate and control.

[0044] In the embodiment of the utility model, the transmission assembly includes a first pulley 332, a second pulley 333 and a poly-V belt 334, wherein the first pulley 332 is fixedly sleeved on the output shaft of the motor 331, the second pulley 333 is fixedly sleeved on the outer sleeve 324, and the poly-V belt 334 is stretched on the first pulley 332 and the second pulley 333. The poly-V belt 334 realizes the transmission connection between the motor 331 and the outer sleeve 324, and the rotation is stable and smooth, which is conducive to improving the accuracy of the measurement. It can be understood that the motor 331 can be installed on a movable plate, and by adjusting the position of the movable plate, the poly-V belt 334 can be tightened to ensure that the torque is transmitted without distortion.

[0045] In the embodiment of the utility model, a connecting bearing is arranged at one end of the inner sleeve 325 away from the fixing unit 2, and the inner ring of the connecting bearing is connected to the inner sleeve 325; the measuring unit 3 also includes a fine adjustment mechanism 35, and the fine adjustment mechanism 35 includes an electric cylinder 351, a support 352 and a seesaw 353, the electric cylinder 351 is arranged on the mounting frame 31, the support 352 is arranged on the mounting frame 31 and is located between the electric cylinder 351 and the shaft expansion mechanism 32, the seesaw 353 and the support 352 are hinged to form a fulcrum, and the two ends of the seesaw 353 are respectively connected to the output end of the electric cylinder 351 and the outer ring of the bearing. By controlling the electric cylinder 351, the seesaw 353 is driven to drive the inner sleeve 325, the expansion sleeve 321 and the core shaft 322 to move slightly in the direction away from the differential, so as to flatten the gasket in the differential and eliminate the gap caused by the uneven gasket. It can be understood that the electric cylinder 351 can be selected as a precision force-controlled electric cylinder 351 to facilitate the output of precise pulling force; further, the seesaw 353 is an elastic thin-walled part, and the seesaw has a certain elasticity, which can eliminate the influence of vibration on the pulling force of the precision force-controlled electric cylinder during dynamic measurement.

[0046] In the embodiment of the utility model, the distance from the fulcrum to the output end of the electric cylinder 351 is equal to the distance from the fulcrum to the axis of the inner sleeve 325. The distance control ratio of the two sides is 1:1, which is convenient for confirming the actual tension value acting on the inner sleeve 325, the expansion sleeve 321 and the core shaft 322.

[0047] In the embodiments of the present invention, please refer to Figure 5 The fixing unit 2 includes a fixing platform, a pressure plate 21 and a second cylinder 22. The fixing platform is arranged on the frame 1 and is provided with a positioning hole for placing the differential. The pressure plate 21 is movably installed above the fixing platform. The second cylinder 22 is arranged on the frame 1 to drive the pressure plate 21 to move up and down to fix the housing of the differential. When fixing the housing of the differential, first place the differential at the positioning hole of the fixing platform, and drive the pressure plate 21 downward by the second cylinder 22 to press on the housing of the fixer, and fix the housing of the differential between the fixing platform and the pressure plate 21. The fixing unit 2 has a simple structure, is easy to operate, and can fix the differential firmly. It can be understood that the pressure plate 21 can be connected to the frame 1 by sliding in the up and down direction through a slide, which can improve the stability of the structure.

[0048] The utility model also proposes a method for dynamically measuring the backlash of a differential gear, using the dynamic measuring device 100 for the backlash of a differential gear. The specific structure of the dynamic measuring device 100 for the backlash of a differential gear refers to the above embodiment. Since the dynamic measuring method for the backlash of a differential gear adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The dynamic measuring method for the backlash of a differential gear includes the following steps:

[0049] S10, controlling the fixing unit 2 to fix the housing of the differential;

[0050] S20, controlling a pair of test units to move, and causing each shaft expansion mechanism 32 to tighten the corresponding half-shaft gear;

[0051] S30, controlling the driving mechanism 33 of one of the measuring units 3 to drive the shaft expansion mechanism 32 to rotate in the positive direction and the reverse direction, and the driving mechanism 33 of the other measuring unit 3 outputs a reverse torsional force as a load;

[0052] S40, obtaining the rotation angle values ​​measured by the two measuring mechanisms 34, and obtaining the differential gear side clearance according to the rotation angle values.

[0053] The differential tooth side clearance dynamic measurement device 100 is adopted, and the above steps can realize the dynamic measurement of the differential tooth side clearance; wherein, in step S40, the differential tooth side clearance is obtained according to the rotation angle value, specifically, when the half-shaft gear corresponding to one measuring unit 3 rotates in the positive direction and the reverse direction, two rotation angle values ​​with deviation of the half-shaft gear corresponding to another measuring unit 3 can be matched at the same rotation angle position, and the deviation of the two rotation angle values ​​is the tooth side clearance of the differential at the rotation angle.

[0054] Further, in step S30, one rotation in the forward direction and one rotation in the reverse direction are regarded as a measurement number of rotations, and the measurement number of rotations is the least common multiple of the sum of the number of teeth of the two half-shaft gears in the differential; the complete tooth side clearance data of the differential (the clearance data corresponding to each tooth of the half-shaft gear and each tooth of the planetary gear) can be measured.

[0055] It can be understood that when the measuring unit 3 also includes a fine-tuning mechanism 35, after each shaft expansion mechanism 32 tightens the corresponding half-shaft gear, it also includes: controlling the electric cylinder 351, driving the rocker 353, and driving the inner sleeve 325 to move away from the differential to flatten the gasket in the differential.

[0056] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A dynamic measurement device for differential gear tooth backlash, characterized in that: include: frame; A fixing unit, disposed on the frame, for fixing the housing of the differential; as well as, A pair of measuring units are arranged on the frame relatively and are respectively located above and below the fixed unit; each of the measuring units includes a mounting frame, an expansion mechanism, a driving mechanism and a measuring mechanism, the mounting frame is movably mounted on the frame and has a movable stroke in the up and down directions; the expansion mechanism is rotatably mounted on the mounting frame to tighten the corresponding half-shaft gear in the differential; the driving mechanism is arranged on the mounting frame and connected to the expansion mechanism; the measuring mechanism includes a circular grating reading head and a circular grating disk arranged relatively, the circular grating reading head is arranged on the mounting frame, and the circular grating disk is arranged on the expansion mechanism; The driving mechanism of one of the measuring units is used to drive the shaft expansion mechanism to rotate, and the driving mechanism of the other measuring unit is used to load the shaft expansion mechanism with a reverse torque force.

2. The differential gear tooth backlash dynamic measurement device according to claim 1, characterized in that: Each of the shaft expansion mechanisms comprises an expansion sleeve and a core shaft. The expansion sleeve is rotatably mounted on the mounting frame, and the core shaft is movably mounted in the expansion sleeve and has a movable stroke in an up-and-down direction relative to the expansion sleeve.

3. The differential gear tooth backlash dynamic measurement device according to claim 2, characterized in that: Each of the shaft expansion mechanisms further includes a first cylinder, which is disposed on the mounting frame and is used to drive the core shaft to move in an up-and-down direction.

4. The differential gear tooth backlash dynamic measurement device according to claim 2, characterized in that: The shaft expansion mechanism further includes an outer sleeve and an inner sleeve, wherein the inner sleeve is sleeved outside the core shaft, the outer sleeve is sleeved outside the inner sleeve, the outer sleeve is rotatably mounted on the mounting frame, and the expansion sleeve is arranged at one end of the inner sleeve close to the fixing unit and is located outside the outer sleeve; wherein: The inner side wall of the outer sleeve is provided with a plurality of first semicircular grooves along the circumferential direction, and the outer side wall of the inner sleeve is provided with a plurality of second semicircular grooves corresponding to the plurality of first semicircular grooves, and a ball is installed in each of the first semicircular grooves and the corresponding second semicircular groove; and / or, A spring is sleeved between the inner sleeve and the outer sleeve, and two ends of the spring are respectively connected to the inner sleeve and the outer sleeve.

5. The differential gear tooth backlash dynamic measurement device according to claim 4, characterized in that: The driving mechanism comprises a motor and a transmission assembly. The motor is arranged on the mounting frame, and the output shaft of the motor is transmission-connected to the outer sleeve through the transmission assembly.

6. The differential gear tooth backlash dynamic measurement device according to claim 5, characterized in that: The transmission assembly includes a first pulley, a second pulley and a multi-V belt. The first pulley is fixedly sleeved on the output shaft of the motor, the second pulley is fixedly sleeved on the outer sleeve, and the multi-V belt is stretched on the first pulley and the second pulley.

7. The differential gear tooth backlash dynamic measurement device according to claim 4, characterized in that: A connecting bearing is provided at one end of the inner sleeve away from the fixing unit, and the inner ring of the connecting bearing is connected to the inner sleeve; the measuring unit also includes a fine-tuning mechanism, and the fine-tuning mechanism includes an electric cylinder, a support and a seesaw, the electric cylinder is arranged on the mounting frame, the support is arranged on the mounting frame and is located between the electric cylinder and the shaft expansion mechanism, the seesaw is hinged to the support to form a fulcrum, and the two ends of the seesaw are respectively connected to the output end of the electric cylinder and the outer ring of the bearing.

8. The differential gear tooth backlash dynamic measurement device according to claim 7, characterized in that: The distance from the fulcrum to the output end of the electric cylinder is equal to the distance from the fulcrum to the axis of the inner sleeve.

9. The differential gear tooth backlash dynamic measurement device according to claim 1, characterized in that: The fixing unit includes a fixing platform, a pressure plate and a second cylinder. The fixing platform is arranged on the frame and is provided with a positioning hole for placing the differential. The pressure plate is movably installed above the fixing platform. The second cylinder is arranged on the frame to drive the pressure plate to move up and down to fix the housing of the differential.

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