Detection system and detection method for differential assembly

Abstract

The invention relates to a detection system and method for a differential assembly, and the system comprises a detection platform which is provided with a clamp; the detection seat is arranged on the detection table in a lifting manner, and two vertically arranged detection rods are arranged on the detection seat; the detection needle is hinged to the bottom end of the detection rod, the lower end of the detection needle is in contact with the half axle gear end face, and the upper end extends to the detection seat; the displacement detection assembly is used for detecting the swing displacement of the upper end of the detection needle so as to represent the axial clearance and meshing jumping state of the half axle gear; the adjusting mechanism is used for driving the two detection rods to be far away from each other in the clamp when the detection seat presses the differential to be detected, so that the lower end of the detection needle is in contact with the end surface of the half axle gear; and the driving mechanism is used for driving one half axle gear in the differential mechanism to be tested to rotate. The axial clearance between the two half axle gears and the meshing run-out of the half axle gears can be detected through one-time installation, the detection function diversity is high, and the detection efficiency is also remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts detection, and in particular to a detection system and a detection method for a differential assembly. Background Art

[0002] The differential is an important part of the vehicle transmission structure, which plays the role of transmitting torque and realizing the differential function between the left and right wheels of the vehicle. Figure 1 The differential assembly is generally composed of a differential housing and flange, a pair of planetary gears, a pair of axle gears, etc. As a separate assembly, the operation of the internal components of the differential plays a key role in the performance of the transmission product and the user's driving experience. The indicators that characterize the operation characteristics of the differential generally include the clearance between the planetary gears and the axle gears, the axial clearance of the axle gears, and the meshing runout of the axle gears.

[0003] In the related art, a Chinese patent with application number CN201610420599.3 proposes a differential assembly side clearance detection device, including a dial indicator, a meter stand, an upper half shaft, a wrench, a nut, a screw, a lower half shaft and a base. The vertical meter stand and the screw are connected side by side on the base, and the dial indicator is inserted horizontally on the top of the meter stand. After the differential is positioned by the lower half shaft, it is supported by two screws of equal height, and the nut and the screw cooperate to lock the differential. The upper half shaft is inserted into the upward inner hole of the in-place differential. The upper half shaft is a vertical short shaft with a horizontal extension arm on one side, the downward end is an external spline shaft, and the upward section is a rectangular tenon. The cantilever end of the horizontal extension arm rests on the dial indicator probe. The wrench cooperates with the rectangular tenon of the upper half shaft through the built-in rectangular inner hole. Turning the wrench clockwise links the upper half shaft, forming a differential assembly side clearance measurement structure under positioning conditions. The invention has a simple detection structure, convenient operation, and true and reliable detection results. Most importantly, it has high detection efficiency and is particularly suitable for online detection.

[0004] The above-mentioned related technologies have the following defects: they can only detect the gap between the planetary gear and the half-shaft gear, the detection function is single, and the related performance of the two half-shaft gears assembled in the differential housing cannot be detected. In addition, when detecting the meshing gap, the operator needs to manually drive the half-shaft gear to rotate. There is undoubtedly low detection efficiency in mass production detection, and the detection accuracy depends on the operator's experience and physical strength. Summary of the invention

[0005] In order to improve the problems of existing differential detection devices, such as single detection function, low detection efficiency, and difficulty in ensuring detection accuracy, the present application provides a detection system and a detection method for a differential assembly.

[0006] The first aspect of the present application provides a detection system for a differential assembly using the following technical solution: A detection system for a differential assembly, comprising: A test bench having a fixture for positioning and clamping the differential, wherein when the differential to be tested is placed in the fixture, the window on the housing of the differential to be tested faces upward; A detection seat is lifted and arranged on the detection platform, and two vertically arranged detection rods are arranged on the detection seat; A detection needle is hinged to the bottom end of the detection rod, the lower end of the detection needle is used to contact the end surface of the half-shaft gear, and the upper end extends to the detection seat; A displacement detection component, used to detect the swing displacement of the upper end of the detection needle, so as to characterize the axial clearance and meshing runout state of the half-shaft gear; An adjusting mechanism is used to drive the two detection rods away from each other in the process of the detection seat pressing the differential to be tested on the fixture so that the lower end of the detection needle contacts the end surface of the half-shaft gear; and The driving mechanism is used for driving one of the half-shaft gears in the differential to be tested to rotate.

[0007] Furthermore, a torsion elastic member is provided at the hinge between the detection needle and the detection rod. When the torsion elastic member is in an initial state, the lower end of the detection needle is located at a side of the detection rod away from the middle of the detection seat.

[0008] Furthermore, the displacement detection component includes: A sliding ball is slidably sleeved on the detection needle, and a sliding groove adapted for sliding with the sliding ball is provided on the detection seat, and the sliding ball is slidably arranged in the sliding groove; The displacement sensor is used to detect the displacement of the sliding ball.

[0009] Furthermore, the detection seat is provided with long grooves arranged along the length direction on two opposite groove walls of the slide groove, and sliding shafts are fixed at both radial ends of the slide ball and slide in the long grooves respectively. The two axes of the slide shafts are colinear and pass through the center of the slide ball. The end of the slide shaft away from the slide ball slides in contact with the groove wall of the long groove, and the displacement sensor is used to detect the displacement of the slide shaft.

[0010] Furthermore, the adjustment mechanism comprises: A plurality of slide bars are provided and are all arranged in parallel, and the slide bars are fixedly connected to the detection seat; There are two sliders, which are respectively slidably mounted on both ends of the plurality of slide bars, and the two detection bars are respectively mounted on the two sliders; A resetting elastic member, disposed between the end of the slide rod and the adjacent slide block; A pressing plate, elastically arranged on the lower end surface of the detection seat, used for pressing the differential to be tested onto the fixture; and The separation component is used to drive the two sliders to move away from each other when the pressing plate is lifted to fit the lower end surface of the detection seat.

[0011] Furthermore, the separation component comprises: A separation baffle, fixedly connected to one side of the pressing plate close to the middle of the slide bar, is arranged in an inclined manner and its upper end extends toward the middle of the slide bar, and the two separation baffles are located between the two slide blocks; The first permanent magnet and the second permanent magnet are respectively fixed to the two opposite side walls of the separation baffle and the adjacent sliding block, and the first permanent magnet and the second permanent magnet repel each other by magnetic force.

[0012] Furthermore, a bending section is provided at the lower end of the detection needle, and a detection ball is provided at the free end of the bending section.

[0013] Furthermore, the driving mechanism comprises: A servo motor is installed on the testing platform; The driving shaft has one end mounted on the output end of the servo motor and the other end detachably mounted with a co-moving member for realizing the co-moving rotation of the driving half-shaft gear.

[0014] Furthermore, it also includes: A torque sensor, coaxially fixedly connected between the output end of the servo motor and the drive shaft; An angle sensor is installed on the servo motor and is used to detect the rotation angle of the drive shaft. The torque sensor and the angle sensor are commonly connected to a gap measuring controller. The clearance measuring controller is configured to: set the angle value of the drive shaft when it rotates forward to the point where the torque sensor detection value is equal to the first set value to 0°; when the drive shaft is reversed to the point where the torque sensor detection value is equal to the first set value, control the angle sensor to detect the rotation angle value of the drive shaft to characterize the meshing clearance between the planetary gear and the half-shaft gear.

[0015] The second aspect of the present application provides a detection method for a differential assembly using the following technical solution: A detection method for a differential assembly, based on the above-mentioned detection system for a differential assembly, comprises the following steps: S1. The differential to be tested is placed on the fixture, and the driving end of the drive mechanism is connected to the corresponding half-shaft gear on the differential to be tested; S2. The detection seat is driven to move downward so that the two detection rods extend from the opening on the differential housing to be tested into the differential housing to be tested and press the differential to be tested on the fixture, and at the same time, the lower ends of the two detection needles are respectively in contact with the edge parts of the end faces of the two half-shaft gears by means of the adjustment mechanism, and the axial clearance of the two half-shaft gears is detected by the displacement detection assembly; S3. Control the drive mechanism to drive the corresponding side gear to rotate forward and reverse slowly to detect the meshing clearance between the planetary gear and the side gear; S4. Control the driving mechanism to drive the corresponding half-shaft gear to rotate at a constant speed, and detect the meshing and jumping state of the two half-shaft gears through the displacement detection component.

[0016] In summary, the beneficial technical effects of this application are: 1. After placing the differential assembly to be tested on the fixture, the detection seat is driven downward by the lifting drive member to allow the two detection rods to penetrate into the opening of the differential housing. In the process of the detection seat moving downward and pressing the differential housing onto the fixture, the two sliders are moved away from each other by the magnetic repulsion between the first permanent magnet and the second permanent magnet, so that the two detection rods are moved away from each other so that the lower ends of the two detection needles are respectively in contact with the corresponding side shaft gear end faces. At this time, the displacement sensor detects the swing displacement of the upper end of the detection needle, and the axial clearance between the two side shaft gears can be detected; 2. The drive shaft is slowly driven to rotate by the servo motor, and stops rotating when the value detected by the torque sensor is equal to the first set value. At this time, it is defined that the meshing teeth of the half-shaft gear are in full contact with the groove wall on one side of the tooth groove of the planetary gear. The rotation angle of the drive shaft detected by the angle sensor at this time is set to 0°; then, the servo motor is controlled to drive the drive shaft to rotate in the opposite direction, and the rotation is stopped when the value detected by the torque sensor is equal to the first set value. At this time, it is defined that the meshing teeth of the half-shaft gear are in full contact with the groove wall on the other side of the tooth groove of the planetary gear. The angle value detected by the angle sensor at this time is the meshing clearance angle of one meshing tooth of the half-shaft gear in one tooth groove of the planetary gear. After conversion, the meshing clearance between the planetary gear and the half-shaft gear can be obtained. Therefore, after such a setting, the present application can also simultaneously detect the meshing clearance between the planetary gear and the half-shaft gear of the differential; 3. After one of the half-shaft gears is driven to rotate at a constant speed by the servo motor, the half-shaft gear can drive the other half-shaft gear to rotate at the same speed and in the opposite direction through the meshing transmission of the planetary gears. Therefore, during the rotation of the two half-shaft gears, the lower ends of the two detection needles are respectively pressed against the end faces of the two half-shaft gears; if the assembly error of the half-shaft gears is large, the half-shaft gears will mesh and jump when rotating. This jump will push the lower end of the detection needle to flip on the lower end of the detection rod, and the upper end will be displaced and detected by the displacement detection component. By comparing the displacement of the upper end of the detection needle of the standard differential during detection, it can be determined whether the differential to be tested meets the assembly tolerance; 4. Through the setting of the present application, it is possible to detect the axial clearance of the two half-shaft gears, the meshing clearance between the half-shaft gears and the planetary gears, and the meshing jump state of the two half-shaft gears can be detected at the same time, and the detection function is highly diverse; and multiple detection items can be completed in one installation, and the detection efficiency has also been significantly improved, which can meet the batch detection of differentials on the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall structural diagram of the differential; Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 3 It is a schematic diagram of the structure of the detection base and related components thereof according to an embodiment of the present application; Figure 4 It is a partial cross-sectional structural schematic diagram of the detection seat and related components thereon according to an embodiment of the present application; Figure 5 It is a schematic cross-sectional structure diagram of the slide seat of an embodiment of the present application.

[0018] Description of reference numerals: 11. Housing; 12. Window; 13. Flange; 14. Axle gear; 15. Planetary gear; 2. Testing platform; 21. Fixture; 211. First recessed portion; 212. Second recessed portion; 23. Lifting drive member; 3. Detection seat; 31. Sliding seat; 311. Sliding groove; 312. Long groove; 41. Detection rod; 42. Detection needle; 43. Torsion elastic member; 44. Bending section; 45. Detection ball; 51. Sliding ball; 511. Sliding shaft; 52. Displacement sensor; 61. Slide bar; 62. Sliding block; 621. Perforation; 622. Locking bolt; 63. Reset elastic member; 64. Pressing plate; 65. Separation baffle; 66. First permanent magnet; 67. Second permanent magnet; 681. Guide rod; 682. Limiting piece; 683. Tension spring; 69. Conformal block; 71. Servo motor; 72. Drive shaft; 73. Moving part; 74. Torque sensor; 75. Angle sensor. DETAILED DESCRIPTION

[0019] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0020] The present application embodiment discloses a detection system for a differential assembly. Figure 2 , Figure 3 and Figure 4 , which includes: The test bench 2 has a fixture 21 for positioning and clamping the differential. When the differential to be tested is placed in the fixture 21, the window 12 on the differential housing 11 to be tested faces upward. Specifically, the fixture 21 has a first recessed portion 211 and a second recessed portion 212. The first recessed portion 211 is used to accommodate and position the differential flange 13, and the second recessed portion 212 is used to accommodate and position the window 12 of the differential housing 11.

[0021] The detection seat 3 is set to be lifted on the detection platform 2, and two vertically arranged detection rods 41 are arranged on it, and the outer distance between the two detection rods 41 is smaller than the gap between the two half-shaft gears 14 of the differential to be tested; a lifting drive member 23 for driving the detection seat 3 to be lifted and lowered is arranged on the detection platform 2, such as a cylinder, an oil cylinder or a linear motor, and the detection seat 3 is installed on the output end of the lifting drive member 23.

[0022] The detection needle 42 is hinged to the bottom end of the detection rod 41. The lower end of the detection needle 42 is used to contact the end surface of the half-shaft gear 14, and the upper end extends to the detection seat 3. Specifically, the distance between the lower end of the detection needle 42 and the bottom end of the detection rod 41 is smaller than the distance between the upper end of the detection needle 42 and the bottom end of the detection rod 41, so as to amplify the displacement of the upper end of the detection rod 41 and improve the detection accuracy of the detection needle 42; and in order to control the distance between the detection needle 42 and the detection rod 41, the upper part of the detection needle 42 can be set to be bent.

[0023] The displacement detection component is used to detect the swing displacement of the upper end of the detection needle 42 to indicate the axial clearance and meshing jump state of the half-shaft gear 14.

[0024] The adjustment mechanism is used to drive the two detection rods 41 away from each other during the process of the detection seat 3 pressing the differential to be tested on the fixture 21 so that the lower end of the detection needle 42 contacts the end surface of the half-shaft gear 14. The driving mechanism is used to drive one of the half-shaft gears 14 in the differential to be tested to rotate.

[0025] In addition, to ensure the fit between the lower end of the detection needle 42 and the end face of the half-shaft gear 14, a torsion elastic member 43 is provided at the hinge between the detection needle 42 and the detection rod 41. When the torsion elastic member 43 is in the initial state, the lower end of the detection needle 42 is located on the side of the corresponding detection rod 41 away from the middle of the detection seat 3. The torsion elastic member 43 is configured as a torsion spring. A fixed shaft rotatably mounted on the lower end of the detection rod 41 is fixedly connected to the detection needle 42. The torsion elastic member 43 is sleeved on the fixed shaft, and one end of the torsion elastic member 43 is fixedly connected to the fixed shaft, and the other end is fixedly connected to the detection rod 41.

[0026] Therefore, when testing the differential assembly, the differential assembly to be tested is first placed on the fixture 21, and the differential flange 13 is stably embedded in the first recessed portion 211, and the window 12 of the differential housing 11 is embedded in the second recessed portion 212. At this time, the differential to be tested cannot move axially along the half-shaft gear 14, nor can it rotate axially along the half-shaft gear 14, which can ensure the consistency of the placement position of each differential to be tested during each test, thereby ensuring the accuracy of the test results.

[0027] Then, the detection seat 3 is driven downward by the lifting drive member 23, so that the two detection rods 41 penetrate into the window 12 of the differential case 11. In the process of the detection seat 3 moving downward and pressing the differential case 11 onto the fixture 21, the two detection rods 41 are moved away from each other by the adjustment mechanism so that the lower ends of the two detection needles 42 are respectively in contact with the corresponding end faces of the half-shaft gear 14, and with the help of the setting of the torsion spring, the lower ends of the detection needles 42 are elastically pressed against the end faces of the half-shaft gear 14, which can ensure the accuracy of the detection needles 42 during detection and avoid damage caused by frequent rigid pressing of the detection needles 42. Specifically, the lower ends of the detection needles 42 are pressed against the edge of the end faces of the half-shaft gear 14, so that the detection system of the present application can meet the detection of both hollow half-shaft gears and solid half-shaft gears. Figure 1 As shown, the two side gears 14 in the differential to be tested are respectively hollow and solid.

[0028] When the detection seat 3 moves down to the right position and the detection needle 42 contacts the end surface of the half-shaft gear 14, the displacement detection component detects the swing displacement of the upper end of the detection needle 42, and the axial clearance between the two half-shaft gears 14 can be detected; at the same time, when one of the half-shaft gears 14 is driven to rotate by the driving mechanism, the half-shaft gear 14 can drive the other half-shaft gear 14 to rotate in the same speed and in the opposite direction through the meshing transmission of the planetary gear 15. Therefore, during the rotation of the two half-shaft gears 14, the lower ends of the two detection needles 42 are respectively pressed against the end surfaces of the two half-shaft gears 14; if the half-shaft gears 14 are rotated, the lower ends of the two detection needles 42 are .... The assembly error of the wheel 14 is large, and the half-shaft gear 14 will have meshing jump when rotating. This jump will push the lower end of the detection needle 42 to flip on the lower end of the detection rod 41, and the upper end will be displaced and detected by the displacement detection component. By comparing the displacement of the upper end of the detection needle 42 of the standard differential during detection, it can be determined whether the differential to be tested meets the assembly tolerance; at the same time, during the rotation of the two half-shaft gears 14, the axial clearance between the two half-shaft gears 14 can also be re-checked to improve the detection accuracy of the axial clearance between the two half-shaft gears 14 and reduce the detection error.

[0029] Therefore, through the setting of the present application, it is possible to detect the axial clearance of the two half-shaft gears 14, and also to detect the meshing and jumping state of the two half-shaft gears 14 at the same time. The detection function is highly diverse, and the detection efficiency is also significantly improved, which can meet the batch detection of differentials on the production line.

[0030] However, in order to avoid the meshing teeth on the end face of the side gear 14 interfering with the detection of the detection needle 42, refer to Figure 3 and Figure 4 A bending section 44 is provided at the lower end of the detection needle 42, and a detection ball 45 is provided at the free end of the bending section 44. When the detection needle 42 flips over on the detection rod 41, detection is performed through the interference between the detection ball 45 and the end face of the half-shaft gear 14. The detection ball 45 can be detachably mounted on the bending section 44 so that it can be replaced immediately after the detection ball 45 is worn. For example, the detection ball 45 is threadedly sleeved on the free end of the bending section 44; and the setting of the bending section 44 makes it easier for the detection ball 45 to avoid the meshing teeth of the rotating half-shaft gear 14, so as to effectively detect the end face of the half-shaft gear 14. At the same time, the setting of the bending section 44 also helps to narrow the distance between the two detection rods 41, so as to improve the sensitivity of the adjustment mechanism to the distance adjustment between the two detection rods 41.

[0031] In addition, refer to Figure 3 and Figure 4 , the above-mentioned regulating mechanism includes: There are multiple slide bars 61 and they are all arranged in parallel. The slide bars 61 are fixed to the detection seat 3. In this embodiment, there are two slide bars 61 and they are spaced apart from the upper end surface of the detection seat 3.

[0032] Two sliders 62 are provided and are slidably mounted on both ends of a plurality of slide bars 61, and two detection rods 41 are respectively installed on the two sliders 62. Specifically, the slider 62 slides on the two slide bars 61 at the same time, and the two detection rods 41 are arranged on both sides of the two slide bars 61 to avoid mutual interference between the two detection rods 41; and the vertical position of the detection rod 41 on the slider 62 is adjustable to be suitable for the detection of differentials of different sizes and models. For example, a through hole 621 for the detection rod 41 to pass through is provided on the slider 62, and a locking bolt 622 for locking the upper end of the detection rod 41 in the through hole 621 is screwed on the side of the slider 62.

[0033] The resetting elastic member 63 is disposed between the end of the slide bar 61 and the adjacent slide block 62 . The resetting elastic member 63 is specifically a spring sleeved on the slide bar 61 .

[0034] The pressing plate 64 is elastically arranged on the lower end surface of the detection seat 3, and is used to press the differential to be tested on the fixture 21. Specifically, a plurality of guide rods 681 penetrating the detection seat 3 are fixedly connected to the upper end surface of the pressing plate 64, and the top of the guide rod 681 is fixedly connected to a limit plate 682, and the outer periphery of the guide rod 681 is sleeved with a tension spring 683 located between the limit plate 682 and the upper end surface of the detection seat 3, and one end of the tension spring 683 is fixedly connected to the limit plate 682, and the other end is fixedly connected to the upper end surface of the detection seat 3.

[0035] The follow-up block 69 is bolted and fixed to the lower end surface of the pressing plate 64, and is used to press and match with the upper flange 13 of the differential to be tested and the top of the housing 11, so that when the test seat 3 is lowered to press the differential to be tested on the fixture 21, the lower end surfaces of the two pressing plates 64 are coplanar; when the present application is used for other types of differentials, the follow-up block 69 and the fixture 21 can be replaced together. And The separation assembly is used to drive the two sliders 62 to move away from each other when the pressing plate 64 is lifted up to fit the lower end surface of the detection seat 3 .

[0036] Specifically, refer to Figure 3 and Figure 4 , the separation components include: The separation baffle 65 is fixed to one side of the pressing plate 64 close to the middle of the slide bar 61, is inclined and its upper end extends toward the middle of the slide bar 61, and the two separation baffles 65 are located between the two slide bars 62. In this embodiment, in order to avoid interference between the two separation baffles 65, the two separation baffles 65 are separately arranged on the outer sides of the two slide bars 61; The first permanent magnet 66 and the second permanent magnet 67 are respectively fixed to the two opposite side walls of the separation baffle 65 and the adjacent slider 62, and the first permanent magnet 66 and the second permanent magnet 67 repel each other magnetically; and the magnetic repulsion force of the first permanent magnet 66 and the second permanent magnet 67 when they are close to each other is greater than the elastic force of the reset elastic member 63 after being compressed, so as to ensure that the magnetic repulsion force of the two can stably push the slider 62 to slide on the slide rod 61.

[0037] In this way, when the detection seat 3 moves downward under the drive of the lifting drive member 23, the follower block 69 on the pressing plate 64 below the detection seat 3 first abuts against the differential to be tested on the fixture 21. As the detection seat 3 continues to move downward, the detection seat 3 moves downward relative to the pressing plate 64, and the distance between the second permanent magnet 67 on the slider 62 and the first permanent magnet 66 on the inclined separation baffle 65 gradually decreases, so that the magnetic repulsion between the first permanent magnet 66 and the second permanent magnet 67 pushes the slider 62 to slide away from the separation baffle 65, so that the two detection rods 41 move away from each other, so that the two detection needles 42 respectively contact the end faces of the two half-shaft gears 14, so that the effect of the two detection rods 41 moving away from each other and the detection needles 42 contacting the end faces of the half-shaft gears 14 can be achieved when the detection seat 3 moves downward.

[0038] When the detection of a differential to be tested is completed, when the detection seat 3 is lifted up under the drive of the lifting drive member 23, the elastic deformation force of the tension spring 683 drives the limit block to drive the pressing plate 64 to move downward relative to the detection seat 3, and the distance between the first permanent magnet 66 and the second permanent magnet 67 gradually increases. At the same time, the elastic deformation force of the reset elastic member 63 drives the slider 62 to approach the other slider 62, so that the two sliders 62 and the detection rod 41 on the lifted detection seat 3 are restored to the initial close state.

[0039] Specifically, refer to Figure 4 and Figure 5 , the above displacement detection component comprises: The sliding ball 51 is slidably sleeved on the detection needle 42. A horizontally arranged sliding seat 31 is fixedly connected to one side of the sliding block 62 close to the other sliding block 62. A sliding groove 311 is provided on the sliding seat 31 to be slidably matched with the sliding ball 51. The sliding groove 311 has a circular cross section and is arranged along the length direction of the sliding rod 61. The sliding ball 51 is slidably arranged in the sliding groove 311. Specifically, a through hole is penetrated and opened on the sliding ball 51 along its radial direction. The upper end of the detection needle 42 is arranged in a round rod shape and passes through the through hole. The displacement sensor 52 is used to detect the displacement of the sliding ball 51. The displacement sensor 52 is specifically a high-precision displacement sensor, such as a laser displacement sensor and a grating displacement sensor, which can achieve or even exceed the measurement accuracy of a micrometer.

[0040] Moreover, the slide seat 31 is provided with long grooves 312 arranged along its length direction on two opposite groove walls of the slide groove 311, and the long groove 312 is connected to the slide groove 311. The radial ends of the slide ball 51 are fixed with slide shafts 511 that slide in the long grooves 312 respectively. The axes of the two slide shafts 511 are colinear and pass through the center of the slide ball 51. The end of the slide shaft 511 away from the slide ball 51 slides in contact with the groove wall of the long groove 312. The displacement sensor 52 is used to detect the displacement of the slide shaft 511. For example, the detection end of the displacement sensor 52 is set at one end of the slide seat 31 and is directly opposite to the long groove 312.

[0041] Therefore, by providing a slide groove 311 and a sliding ball 51 slidingly arranged in the slide groove 311 on the detection seat 3, when the upper end of the detection needle 42 swings, the upper end of the detection needle 42 slides in the sliding ball 51, which can push the sliding ball 51 to move horizontally and flip in the slide groove 311, and will not interfere with the normal flipping of the detection needle 42; and a sliding shaft 511 is provided at the end of the sliding ball 51, and a displacement sensor 52 is used to detect the displacement change of the sliding shaft 51. Since the axis of the sliding shaft 511 is always aligned with the intersection of the detection rod 41 and the horizontal plane of the center of the sliding ball 51, the actual horizontal displacement of the detection needle 42 at different flipping angles can be accurately detected, and will not be affected by the volume of the sliding ball 51 and the flipping angle of the detection needle 42, thereby ensuring the detection accuracy of the displacement detection component on the displacement of the upper end of the detection needle 42.

[0042] In addition, refer to Figure 2 , to further increase the detection function of this application.

[0043] The driving mechanism includes: The servo motor 71 is installed on the detection platform 2 , and a horizontally arranged linear driving component is installed on the detection platform 2 . The servo motor 71 is installed on the output end of the linear driving component and is slidably arranged on the upper end surface of the detection platform 2 .

[0044] The driving shaft 72 has one end mounted on the output end of the servo motor 71 and the other end detachably mounted with a co-moving member 73 for realizing the rotation of the co-moving driving half-shaft gear 14. The co-moving member 73 is bolted and fixed on the driving shaft 72. If the corresponding half-shaft gear 14 is a solid half-shaft gear 14, the co-moving member 73 is a sleeve with a spline on the inner wall; if the corresponding half-shaft gear 14 is a hollow half-shaft gear 14, the co-moving member 73 is a key shaft with a spline on the outer wall.

[0045] The torque sensor 74 is coaxially fixedly connected between the output end of the servo motor 71 and the driving shaft 72 .

[0046] The angle sensor 75 is mounted on the servo motor 71 and is used to detect the rotation angle of the driving shaft 72. The torque sensor 74 and the angle sensor 75 are commonly connected to a gap measuring controller.

[0047] The gap measuring controller is configured as follows: setting the angle value when the drive shaft 72 rotates forward to the point where the detection value of the torque sensor 74 is equal to the first set value to 0°; when the drive shaft 72 is reversed to the point where the detection value of the torque sensor 74 is equal to the first set value, controlling the angle sensor 75 to detect the rotation angle value of the drive shaft 72 to characterize the meshing clearance between the planetary gear 15 and the half-shaft gear 14; wherein the first set value is smaller than the torque value detected by the torque sensor 74 when the drive shaft 72 drives the corresponding half-shaft gear 14 to rotate at a constant speed.

[0048] In this way, after the differential to be tested is fixed by the test seat 3, the servo motor 71 is driven by the linear drive member to move toward the direction close to the fixture 21, and the synchronous member 73 on the drive shaft 72 is synchronously connected with a half-shaft gear 14 on the differential to be tested. When testing, on the one hand, the drive shaft 72 can be slowly driven to rotate by the servo motor 71, and the rotation is stopped when the value detected by the torque sensor 74 is equal to the first set value. At this time, it is defined that the meshing teeth of the half-shaft gear 14 are completely in contact with the groove wall on one side of the tooth groove of the planetary gear 15, and the rotation angle of the drive shaft 72 detected by the angle sensor 75 is set to 0° at this time; then, The servo motor 71 is controlled to drive the drive shaft 72 to rotate in the opposite direction, and the rotation is stopped when the value detected by the torque sensor 74 is equal to the first set value. At this time, it is defined that the meshing teeth of the half-shaft gear 14 are completely in contact with the groove wall on the other side of the tooth groove of the planetary gear 15, and the angle value detected by the angle sensor 75 at this time is the meshing clearance angle of a meshing tooth of the half-shaft gear 14 in a tooth groove of the planetary gear 15. After conversion, the meshing clearance between the planetary gear 15 and the half-shaft gear 14 can be obtained. Therefore, after such a setting, the present application can also simultaneously detect the meshing clearance between the planetary gear 15 and the half-shaft gear 14 of the differential.

[0049] On the other hand, after the above-mentioned meshing clearance detection is completed, the servo motor 71 is restarted until the drive shaft 72 drives the half-shaft gear 14 to rotate at a constant speed. At this time, the torque sensor 74 can detect the uniform rotation torque of the differential to be tested. By comparing it with the value of the uniform rotation torque of the standard differential, the meshing transmission smoothness of the differential to be tested can be determined, thereby providing more reference data for the quality detection of the differential.

[0050] The present application embodiment discloses a detection method for a differential assembly, based on the above-mentioned detection system for a differential assembly, referring to Figure 1 , Figure 2 and Figure 3 , which comprises the following steps: S1. The differential to be tested is placed on the fixture 21, and the drive end of the drive mechanism is connected to the corresponding side gear 14 on the differential to be tested; S2. The detection seat 3 is driven downward to allow the two detection rods 41 to extend from the opening 12 on the differential housing 11 to be tested into the differential housing 11 to be tested and to press the differential to be tested on the fixture 21. At the same time, the lower ends of the two detection needles 42 are respectively in contact with the edge portions of the end surfaces of the two side gears 14 by means of the adjustment mechanism, and the axial clearance of the two side gears 14 is detected by the displacement detection assembly; S3. Control the drive mechanism to drive the corresponding side gear 14 to rotate forward and reverse slowly to detect the meshing clearance between the planetary gear 15 and the side gear 14; S4. Control the driving mechanism to drive the corresponding half-shaft gear 14 to rotate at a constant speed, and detect the meshing and jumping state of the two half-shaft gears 14 through the displacement detection component.

[0051] The implementation principle of a detection system for a differential assembly in the embodiment of the present application is as follows: After the differential assembly to be tested is placed on the fixture 21, the detection seat 3 is driven downward by the lifting drive member 23 to allow the two detection rods 41 to penetrate into the window 12 of the differential housing 11. In the process of the detection seat 3 moving downward and pressing the differential housing 11 onto the fixture 21, the two sliders 62 are moved away from each other by the magnetic repulsion between the first permanent magnet 66 and the second permanent magnet 67, so that the two detection rods 41 are moved away from each other so that the lower ends of the two detection needles 42 are respectively in contact with the corresponding end faces of the half-shaft gears 14. At this time, the displacement sensor 52 detects the swing displacement of the upper end of the detection needle 42, and can detect the axial gap between the two half-shaft gears 14.

[0052] While the servo motor 71 drives the driving shaft 72 to rotate forward and reverse slowly, the meshing clearance between the half-shaft gear 14 and the planetary gear 15 can be detected with the help of the torque sensor 74 and the angle sensor 75 . Subsequently, after one of the half-shaft gears 14 is driven to rotate at a uniform speed by the servo motor 71, the half-shaft gear 14 can drive the other half-shaft gear 14 to rotate in the same speed and opposite direction through the meshing transmission of the planetary gear 15 during rotation. Therefore, during the rotation of the two half-shaft gears 14, the lower ends of the two detection pins 42 are respectively pressed against the end faces of the two half-shaft gears 14; if the assembly error of the half-shaft gears 14 is large, the half-shaft gears 14 will mesh and jump during rotation. This jump will push the lower end of the detection pin 42 to flip on the lower end of the detection rod 41, and the upper end will be displaced and detected by the displacement detection component. By comparing the displacement of the upper end of the detection pin 42 of the standard differential during detection, it can be determined whether the differential to be tested meets the assembly tolerance; at the same time, during the rotation of the two half-shaft gears 14, the axial clearance between the two half-shaft gears 14 can also be re-checked to improve the detection accuracy of the axial clearance between the two half-shaft gears 14 and reduce the detection error.

[0053] Therefore, through the setting of the present application, it is possible to detect the axial clearance of the two half-shaft gears 14, the meshing clearance between the half-shaft gears 14 and the planetary gears 15, and the meshing jump state of the two half-shaft gears 14 can also be detected simultaneously. The detection function is highly diverse, and multiple detection items can be completed in one installation. The detection efficiency is also significantly improved, which can meet the batch detection of differentials on the production line.

[0054] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A detection system for a differential assembly, characterized in that: include: A test bench (2) having a fixture (21) for positioning and clamping a differential, wherein when the differential to be tested is placed in the fixture (21), the window (12) on the housing (11) of the differential to be tested faces upward; A detection seat (3) is lifted and disposed on the detection platform (2), and two vertically disposed detection rods (41) are disposed on the detection seat; A detection needle (42) is hinged to the bottom end of the detection rod (41), the lower end of the detection needle (42) being used to contact the end surface of the half-shaft gear (14), and the upper end extending to the detection seat (3); A displacement detection component, used to detect the swing displacement of the upper end of the detection needle (42) to characterize the axial clearance and meshing jump state of the half-shaft gear (14); an adjusting mechanism for driving the two detection rods (41) away from each other during the process of the detection seat (3) pressing the differential to be tested onto the fixture (21) so that the lower end of the detection needle (42) contacts the end surface of the half-shaft gear (14); and The driving mechanism is used for driving one of the half-shaft gears (14) in the differential to be tested to rotate.

2. A detection system for a differential assembly according to claim 1, characterized in that: A torsion elastic member (43) is provided at the hinged joint between the detection needle (42) and the detection rod (41); when the torsion elastic member (43) is in an initial state, the lower end of the detection needle (42) is located at a side of the detection rod (41) away from the middle of the detection seat (3).

3. A detection system for a differential assembly according to claim 2, characterized in that: The displacement detection component comprises: A sliding ball (51) is slidably sleeved on the detection needle (42); a sliding groove (311) slidably matched with the sliding ball (51) is provided on the detection seat (3); and the sliding ball (51) is slidably arranged in the sliding groove (311); A displacement sensor (52) is used to detect the displacement of the sliding ball (51).

4. A detection system for a differential assembly according to claim 3, characterized in that: The detection seat (3) is provided with long grooves (312) arranged along the length direction of the sliding groove (311) on two opposite groove walls. The sliding ball (51) is fixedly connected to two radial ends with sliding shafts (511) respectively sliding in the long grooves (312). The axes of the two sliding shafts (511) are collinear and pass through the center of the sliding ball (51). One end of the sliding shaft (511) away from the sliding ball (51) slides in contact with the groove wall of the long groove (312). The displacement sensor (52) is used to detect the displacement of the sliding shaft (511).

5. The detection system for a differential assembly according to claim 1, characterized in that: The regulating mechanism comprises: A plurality of slide bars (61) are provided and are arranged in parallel, and the slide bars (61) are fixedly connected to the detection seat (3); Two sliders (62) are provided and are respectively slidably sleeved on two ends of the plurality of slide bars (61); the two detection bars (41) are respectively mounted on the two sliders (62); A resetting elastic member (63) is provided between the end of the slide rod (61) and the adjacent slide block (62); A pressing plate (64) is elastically arranged on the lower end surface of the detection seat (3) and is used to press the differential to be tested onto the fixture (21); and A separation component is used to drive the two slide blocks (62) to move away from each other when the pressing plate (64) is lifted up to fit the lower end surface of the detection seat (3).

6. A detection system for a differential assembly according to claim 5, characterized in that: The separation component comprises: A separation baffle (65) is fixedly connected to one side of the pressing plate (64) close to the middle of the slide bar (61), is arranged in an inclined manner and has an upper end extending in a direction close to the middle of the slide bar (61), and the two separation baffles (65) are located between the two slide blocks (62); The first permanent magnet (66) and the second permanent magnet (67) are respectively fixed to opposite side walls of the separation baffle (65) and the adjacent sliding block (62), and the first permanent magnet (66) and the second permanent magnet (67) repel each other magnetically.

7. The detection system for a differential assembly according to claim 1, characterized in that: The lower end of the detection needle (42) is provided with a bending section (44), and the free end of the bending section (44) is provided with a detection ball (45).

8. A detection system for a differential assembly according to any one of claims 1 to 7, characterized in that: The driving mechanism comprises: A servo motor (71) mounted on the detection platform (2); A driving shaft (72) has one end mounted on the output end of the servo motor (71) and the other end of the driving shaft (72) is detachably mounted with a synchronous member (73) for realizing synchronous rotation of the driving half-shaft gear (14).

9. A detection system for a differential assembly according to claim 8, characterized in that: Also includes: A torque sensor (74) coaxially fixedly connected between an output end of the servo motor (71) and the drive shaft (72); an angle sensor (75) mounted on the servo motor (71) and used to detect the rotation angle of the drive shaft (72); the torque sensor (74) and the angle sensor (75) are commonly connected to a gap measuring controller; The clearance measuring controller is configured to: set the angle value of the drive shaft (72) when it rotates forward to a value detected by the torque sensor (74) equal to a first set value to 0°; and when the drive shaft (72) rotates reversely to a value detected by the torque sensor (74) equal to the first set value, control the angle sensor (75) to detect the rotation angle value of the drive shaft (72) to characterize the meshing clearance between the planetary gear (15) and the half-shaft gear (14).

10. A detection method for a differential assembly, based on a detection system for a differential assembly as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. The differential to be tested is placed on the fixture (21), and the driving end of the driving mechanism is connected to the corresponding half-shaft gear (14) on the differential to be tested; S2. driving the detection seat (3) to move downward so that the two detection rods (41) extend from the opening (12) on the differential housing (11) to be detected into the differential housing (11) to be detected and press the differential to be detected on the fixture (21); at the same time, by means of the adjustment mechanism, the lower ends of the two detection needles (42) are respectively in contact with the edge portions of the end surfaces of the two half-shaft gears (14), and the axial clearance of the two half-shaft gears (14) is detected by the displacement detection assembly; S3. Controlling the driving mechanism to drive the corresponding side gear (14) to rotate forward and reverse slowly to detect the meshing clearance between the planetary gear (15) and the side gear (14); S4. Controlling the driving mechanism to drive the corresponding half-shaft gear (14) to rotate at a constant speed, and detecting the meshing and jumping state of the two half-shaft gears (14) through the displacement detection component.

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