A detection device and method for differential half-shaft gear clearance

Abstract

The present invention proposes a detection device and method for the clearance of axle gears of a differential, and relates to the technical field of automobile parts detection. The present invention provides a detection device for the clearance of axle gears of a differential, comprising a power mechanism and a first detection mechanism, wherein the power mechanism is transmission-connected to the first detection mechanism, the first detection mechanism comprises a push-pull rod and a displacement sensor, a circumferential transmission assembly is arranged on the push-pull rod, the displacement sensor is arranged on both sides of the push-pull rod, and a fixing assembly is arranged at the bottom of the circumferential transmission assembly and the displacement sensor; it can dynamically detect the clearance of axle gears on the differential through the axial transmission assembly, the displacement sensor and the circumferential transmission assembly, and has higher accuracy than the traditional static detection method. In addition, the present invention also proposes a detection method based on the clearance of axle gears of a differential, which has higher accuracy than the traditional static detection method.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts detection, and in particular to a device and method for detecting a differential half-shaft gear clearance. Background Art

[0002] The differential is an essential functional component of the car. It is a mechanism that enables the left and right (or front and rear) driving wheels to rotate at different speeds. In its structure, the clearance between the axle gear and the planetary gear is particularly important. Automobile manufacturers have certain requirements for the range of gear clearance. The common range is generally 0.1-0.18mm, and the specific parameters of different manufacturers are slightly different. The existing detection method in China is the static measurement detection method, that is, the clearance between the axle gear and the planetary gear is calculated by statically measuring the axial play of the axle gear; but since all the axle gears and planetary gears are forged structures, their processing accuracy level is 10-12 (slightly different from different manufacturers). Due to the different processing accuracy, the degree of meshing will be different. Therefore, the use of the static measurement method will cause the gear clearance measurement to be very different when different gears are meshing. On the other hand, since the axle gear and the differential straight shaft are clearance matched, measuring the fit clearance while measuring the meshing clearance between the axle gear and the planetary gear will cause misjudgment of the movement measurement.

[0003] Therefore, there is an urgent need for a new detection device and method that can improve the shortcomings of the above-mentioned static measurement method. Summary of the invention

[0004] The object of the present invention is to provide a detection device for the half-axle gear clearance of a differential, which can dynamically detect the half-axle gear clearance on the differential through an axial transmission component, a displacement sensor and a circumferential transmission component, and has higher accuracy than traditional static detection methods.

[0005] The second purpose of the present invention is to provide a detection method based on a detection device for the clearance of axle gears of a differential, which can detect the meshing clearance between the axle gears and the planetary gears, and the fitting clearance between the axle gears and the straight shaft by dynamic detection. Compared with the traditional static detection method, it has higher accuracy and can also detect the left axle gear and the right axle gear of the differential separately, avoiding the influence of the fitting clearance between the straight shaft and the planetary gear hole on the measurement of the fitting clearance between the axle gears and the straight shaft.

[0006] The embodiment of the present invention is achieved as follows:

[0007] In the first aspect, the embodiment of the present application provides a differential half-shaft gear clearance detection device, which includes a power mechanism and a first detection mechanism, the power mechanism is transmission-connected to the first detection mechanism, the first detection mechanism includes a push-pull rod and a displacement sensor, the push-pull rod is provided with a circumferential transmission component, the displacement sensor is provided on both sides of the push-pull rod, and a fixing component is provided at the bottom of the circumferential transmission component and the displacement sensor. .

[0008] In some embodiments of the present invention, the above-mentioned first detection mechanism also includes a limit assembly, the limit assembly includes a limit plate and a pull claw, the pull claw includes a connecting part and a plurality of claw parts, the claw part is clamped with the limit plate, the connecting part is slidably connected with the push-pull rod, and the limit plate is connected with the fixed assembly.

[0009] In some embodiments of the present invention, the above-mentioned limiting assembly further includes a compression spring and a telescopic sleeve, the compression spring is sleeved on the pull rod, and the telescopic sleeve is sleeved on the compression spring.

[0010] In some embodiments of the present invention, the above-mentioned differential half-shaft gear clearance detection device also includes an axial transmission assembly, the axial transmission assembly includes a cylinder for pushing and pulling the push-pull rod, and the cylinder is connected to the end of the push-pull rod.

[0011] In some embodiments of the present invention, the power mechanism includes a motor, the circumferential transmission assembly includes a sleeve, the sleeve is sleeved on the push-pull rod, and the motor is transmission-connected to the sleeve.

[0012] In some embodiments of the present invention, the above-mentioned fixing assembly includes a bearing seat, a bearing and a differential fixing seat, the bearing sleeve is arranged on the shaft sleeve, the bearing seat at one end of the shaft sleeve is connected to the bearing, and the differential fixing seat is connected to the bottom of the bearing seat.

[0013] In some embodiments of the present invention, the fixing assembly further includes a fixing plate, one side of the fixing plate is connected to the bearing seat, and the bottom of the fixing plate is connected to the differential fixing seat.

[0014] In some embodiments of the present invention, the above-mentioned differential half-shaft gear clearance detection device also includes a second detection mechanism, which is mirror-symmetrical to the first detection mechanism in the axial direction of the push-pull rod, and the second detection mechanism is connected to the first detection mechanism through the push-pull rod.

[0015] In a second aspect, an embodiment of the present application provides a detection method based on a detection device for a differential axle gear clearance, which includes the following steps based on a first detection mechanism: fixing the differential on a fixing assembly, controlling a push-pull rod through an axial transmission assembly to pull the axle gears of the differential apart to a position meshing with a housing of the differential, and controlling the axle gears to rotate for more than 1 minute through a circumferential transmission assembly, at which time a displacement sensor records and obtains a deflection distance S1 of the axle gears;

[0016] The axial transmission assembly then controls the push-pull rod to pull the half-shaft gear to the position where it meshes with the planetary gear of the differential, and the circumferential transmission assembly controls the half-shaft gear to rotate for the same period of time. At this time, the displacement sensor records and obtains the deflection distance S2 of the half-shaft gear, and the difference between S2 and S1 is calculated to obtain the clearance of the half-shaft gear.

[0017] In some embodiments of the present invention, the above detection method is also based on a second detection mechanism and a first detection mechanism, the second detection mechanism is mirror-symmetrical with the first detection mechanism in the axial direction of the push-pull rod, and the second detection mechanism is connected to the first detection mechanism through the push-pull rod; the above detection method includes the following steps: fixing the differential on a fixed component, controlling the push-pull rod through an axial transmission component to pull the left half-shaft gear and the right half-shaft gear of the differential apart to a position meshing with the housing of the differential, and controlling the left half-shaft gear and the right half-shaft gear to rotate for more than 1 minute by the circumferential transmission component, and this At this time, the displacement sensor records and obtains the deflection distances S3 and S4 of the left and right half-shaft gears; then the axial transmission component controls the push-pull rod to pull the left and right half-shaft gears to the position meshing with the planetary gears of the differential, and the circumferential transmission component controls the left and right half-shaft gears to rotate for the same time. At this time, the displacement sensor records and obtains the deflection distances S5 and S6 of the left and right half-shaft gears, and the difference between S5 and S3 is calculated to obtain the clearance of the left half-shaft gear, and the difference between S6 and S4 is calculated to obtain the clearance of the right half-shaft gear.

[0018] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0019] 1. An embodiment of the present invention provides a device for detecting the clearance of axle gears of a differential. The first detection mechanism can pull the axle gears on the differential through an axial transmission component, and then rotate the axle gears through a circumferential transmission component. The rotation distance of the axle gears is recorded by a displacement sensor to calculate the clearance of the axle gears, thereby realizing dynamic detection. Compared with the original static detection, it is no longer necessary to consider the errors caused by the processing accuracy of the axle gears and the planetary gears themselves, so that the detection of the clearance of the axle gears is more accurate, thereby improving the tire rotation accuracy of the car during turning, reducing energy consumption, and saving energy.

[0020] 2. An embodiment of the present invention further provides a detection method based on a detection device for differential half-axle gear clearance. The detection method is implemented based on a first detection mechanism, thereby realizing dynamic detection of half-axle gear clearance, thereby improving the detection accuracy of half-axle gear clearance compared to existing static detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a schematic diagram of embodiment 1 of the present invention;

[0023] Figure 2 is a schematic diagram of embodiment 2 of the present invention;

[0024] Figure 3 For the embodiment of the present invention Figure 1 A is an enlarged schematic diagram;

[0025] Figure 4 Schematic diagram of the pulling claw in an embodiment of the present invention.

[0026] Icons: 1-push-pull rod; 200-circumferential transmission assembly; 210-pulley; 211-transmission wheel; 212-driving wheel; 213-transmission belt; 220-bushing; 230-motor; 3-cylinder; 400-fixing assembly; 401-differential fixing seat; 402-fixing plate; 403-bearing seat; 404-bearing; 5-displacement sensor; 600-limiting assembly; 610-compression spring; 620-telescopic sleeve; 630-pulling claw; 631-connecting part; 632-claw; 633-protrusion; 640-spreading member; 650-O-ring; 660-limiting plate; 7-connecting plate; 8-sliding groove; 9-first detection mechanism; 10-second detection mechanism; 11-power mechanism. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present invention, "plurality" means at least 2.

[0033] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Example 1

[0035] Please refer to Figure 1 , Figure 1 Shown is a schematic diagram of Example 1 of the present invention.

[0036] The present embodiment provides a device for detecting the clearance of a differential half-axle gear, which includes a power mechanism 11 and a first detection mechanism 9. The power mechanism 11 is transmission-connected to the first detection mechanism 9. The first detection mechanism 9 includes a push-pull rod 1 and a displacement sensor 5. A circumferential transmission component 200 is provided on the push-pull rod 1. The displacement sensor 5 is provided on both sides of the push-pull rod 1. A fixing component 400 is provided at the bottom of the circumferential transmission component 200 and the displacement sensor 5. The fixing assembly 400 can not only fix other components in the entire first detection mechanism 9, making the structure of the entire first detection mechanism 9 more stable, but also fix the differential on the first detection mechanism 9 to prevent the differential from loosening during the dynamic detection process, thereby causing the side gear to move and cause deviation in the detection result. The side gear on the differential is fixed on the push-pull rod 1. The movement of the push-pull rod 1 can be controlled by the axial transmission assembly to control the movement of the side gear, thereby controlling the meshing of the side gear with the differential housing or the planetary gear. The circumferential transmission assembly 200 controls the side gear to rotate after meshing with the differential housing or the planetary gear. At the same time, the displacement sensor 5 records the deflection distance S of the side gear after meshing with the differential housing and the deflection distance S of the side gear after meshing with the planetary gear. The difference between S and S is the clearance of the side gear. The entire first detection mechanism 9 detects the clearance of the side gear in motion, which is more accurate than the original static detection, and there is no need to worry that the detection of the clearance of the side gear will be affected by the processing accuracy of the side gear and the planetary gear. In this embodiment, the push-pull rod 1 is connected to the fixed assembly 400 through the circumferential transmission assembly 200, so that the push-pull rod 1 can move freely, and the displacement sensor 5 is of NCDT type, which can be detected by laser scanning to improve the detection accuracy. In addition, the push-pull rod 1 can also be directly connected to the fixed assembly 400, and the push-pull rod 1 can be freely moved by setting a through hole on the fixed assembly 400 to ensure the free movement of the push-pull rod 1, and the displacement sensor 5 can also adopt other models on the premise of ensuring accurate detection results.

[0037] Please refer to Figure 3 and Figure 4 , Figure 3 It is an enlarged schematic diagram of A in the embodiment of the present invention. Figure 4The first detection mechanism 9 further comprises a limit assembly 600, the limit assembly 600 comprises a limit plate 660 and a pull claw 630, the pull claw 630 comprises a connecting portion 631 and a plurality of claw portions 632, the claw portion 632 is engaged with the limit plate 660, the connecting portion 631 is slidably connected with the push-pull rod 1, and the limit plate 660 is connected with the fixing assembly 400. The claw portion 632 of the pull claw 630 is engaged with the limit plate 660. When the push-pull rod 1 is pulled out, the claw portion 632 of the pull claw 630 is engaged with the limit plate 660 and the limit plate 660 is fixedly connected to the fixing assembly 400, thereby ensuring that the push-pull rod 1 will not be pulled out. Since the connecting portion 631 of the pull claw 630 is slidably connected with the push-pull rod 1, when the push-pull rod 1 is pulled out, it can be ensured that the push-pull rod 1 can be pulled out a certain distance, thereby enabling the half-axle gear on the push-pull rod 1 to mesh with the differential housing. In this embodiment, the pull claw 630 is provided with two mutually symmetrical claw portions 632. The two mutually symmetrical claw portions 632 can make the pull claw 630 firmly grasp the limit plate 660 while the two claw portions 632 are evenly stressed, thereby preventing the entire pull claw 630 from falling off due to excessive stress on one of the claw portions 632. In addition, additional claws 632 may be provided according to actual needs, such as an even number of four or six, so as to ensure that the claws 632 are symmetrical in structure and each claw 632 is evenly stressed. In this embodiment, a sliding groove 8 is provided on the push-pull rod 1, and correspondingly, a protrusion 633 is provided on the connecting portion 631 of the pull claw 630. By passing the protrusion 633 through the sliding groove 8, the push-pull rod 1 can slide relative to the pull claw 630 while ensuring that the pull claw 630 does not move. An O-ring 650 is provided at the claw 632 of the pull claw 630 to prevent impurities from entering the claw 632 and causing the claw 632 to loosen from the limit plate 660, and to prevent the claw 632 from rusting, thereby extending the service life of the claw 632. In addition, the connection part 631 of the pull claw 630 can also be set as a retractable structure, and one end of the push-pull rod 1 is directly welded to the connection part 631, so that the push-pull rod 1 can have a certain push-pull distance while preventing the push-pull rod 1 and the pull claw 630 from falling off. In this embodiment, in order to ensure that the two pull claws 630 can be tightly engaged with the limit plate 660, a propping member 640 is provided between the two pull claws 630, which is respectively pressed against the two pull claws 630, wherein the propping member 640 can prop open all the multiple claws 632, so that the claws 632 can fully grasp the limit plate 660, and avoid the claws 632 from loosening due to some collisions during the use of the first detection mechanism 9, thereby preventing the pull claw 630 from being fixed to the limit plate 660. In addition, bolts and nuts may be provided on the pull claw 630 to fix the pull claw 630 and the limiting plate 660 , and the pull claw 630 and the limiting plate 660 may be engaged with each other to prevent the pull claw 630 from loosening.

[0038] Please refer to Figure 1 The above-mentioned limit assembly 600 also includes a compression spring 610 and a telescopic sleeve 620. The compression spring 610 is sleeved on the pull rod, and the telescopic sleeve 620 is sleeved on the compression spring 610. The compression spring 610 cannot be stretched. When the push-pull rod 1 is in the maximum pulled position, the compression spring 610 is in a naturally straightened state. When the push-pull rod 1 is pushed inward, the compression spring 610 plays a buffering role to prevent the push-pull rod 1 from retracting too quickly and causing the push-pull rod 1 to collide with the pull claw 630, thereby causing the component to shrink. The telescopic sleeve 620 not only assists the buffering effect of the compression spring 610, but also protects the compression spring 610. In this embodiment, the compression spring 610 is sleeved on the push-pull rod 1, but does not move with the push-pull rod 1. In addition, the compression spring 610 can be connected to the push-pull rod 1, and when the push-pull rod 1 is retracted, the compression spring 610 provides it with a buffering effect.

[0039] Please refer to Figure 1 The above-mentioned differential half-axle gear clearance detection device also includes an axial transmission assembly, which includes a cylinder 3 for pushing and pulling the push-pull rod 1, and the cylinder 3 is connected to the end of the push-pull rod 1. After turning on the switch on the cylinder 3, the cylinder 3 performs telescopic movement inside and drives the push-pull rod 1 to move, thereby controlling the pulling out and retraction of the push-pull rod 1. In this embodiment, the push-pull rod 1 is moved by the contraction of the cylinder 3. In addition, the push-pull rod 1 can also be driven to move by a rotating electric device.

[0040] Please refer to Figure 1 The power mechanism 10 includes a motor 230, and the circumferential transmission assembly 200 includes a sleeve 220, which is sleeved on the push-pull rod 1, and the motor 230 is in transmission connection with the sleeve 220. The sleeve 220 is driven to move circumferentially by the motor 230, so that the sleeve 220 drives the half-shaft gear on the sleeve 220 to rotate, thereby realizing the dynamic detection of the half-shaft gear. In this embodiment, the sleeve 220 is driven to rotate by the pulley 210 and the transmission belt 213 between the motor 230 and the sleeve 220, wherein the pulley 210 includes a driving wheel 212 and a transmission wheel 211, the driving wheel 212 is in transmission connection with the motor 230, and the driven wheel is in transmission connection with the sleeve 220, and then the sleeve 220 drives the half-shaft gear to rotate, thereby realizing the purpose of transmission, and the sleeve 220 is driven to rotate by the motor 230 and the pulley 210 to realize the transmission. The initial output speed of the motor 230 can be reduced by multiple transmission connections, so as to avoid excessive deflection of the axle gear due to excessive speed caused by the initial speed of the motor 230 being too high, and the output direction of the speed can be changed by transmission, so that the motor 230 can rotate in any direction. In addition, an external electric device can be directly connected to the shaft sleeve 220 to realize direct rotation of the shaft sleeve 220, thereby driving the axle gear to rotate.

[0041] Please refer to Figure 1 The fixing assembly 400 includes a bearing seat 403, a bearing 404 and a differential fixing seat 401. The bearing 404 is sleeved on the shaft sleeve 220, the bearing seat 403 is connected to the bearing 404, and the differential fixing seat 401 is connected to the bottom of the bearing seat 403. The bearing 404 is sleeved on the entire shaft sleeve 220, which can not only assist the shaft sleeve 220 in rotating, but also support the entire device through the bearing seat 403. In this embodiment, the differential fixing seat 401, as the base of the entire fixing assembly 400, can not only maintain the stability of the entire first detection mechanism 9, but also be fixed with the differential to prevent the shaking of the differential from causing the half-shaft gear on the differential to deflect unnaturally and thus cause deviation in the detection result. In this embodiment, a plurality of flange holes (not marked in the figure) for fixing the differential are provided on the differential fixing seat 401, and the differential and the differential fixing seat 401 are fixed together through the flange to ensure the stability of the differential during detection. In addition, a snap ring may be provided on the differential fixing seat 401 , and the differential may be fixed to the differential fixing seat 401 by the snap ring, so that the differential and the differential fixing seat 401 are firmly connected and can be easily disassembled.

[0042] Please refer to Figure 1 The fixing assembly 400 further includes a fixing plate 402, one side of which is connected to the bearing seat 403, and the bottom of the fixing plate 402 is connected to the differential fixing seat 401. The fixing plate 402 can reinforce the bearing seat 403 and further prevent the bearing seat 403 from being offset. In this embodiment, the fixing plate 402 is detachably connected to the bearing seat 403. In addition, the fixing plate 402 can also be fixedly connected to the bearing seat 403.

[0043] Example 2

[0044] Please refer to Figure 2 , Figure 2 Shown is a schematic diagram of Example 2 of the present invention.

[0045] This embodiment is based on Embodiment 1.

[0046] This embodiment provides a detection device for the clearance of axle gears of a differential, and further includes a second detection mechanism 10, which is mirror-symmetrical with the first detection mechanism 9 in the axial direction of the push-pull rod 1, and the second detection mechanism 10 is connected to the first detection mechanism 9 through the push-pull rod 1. The second detection mechanism 10 can detect the left and right axle gears on the differential at the same time as the first detection mechanism 9, saving time, and detecting the left and right axle gears separately, avoiding the meshing effect of the straight shaft or cross shaft on the differential on the axle gears and the planetary gears, avoiding inaccurate detection results due to the same device, and reducing the probability of errors. In this embodiment, the second detection mechanism 10 is connected to the first detection mechanism 9 through a connecting plate 7 to ensure that they detect the synchronization of the left half-shaft gear and the right half-shaft gear respectively. The second detection device has certain subtle differences from the first detection mechanism 9. For example, in order to save costs, the two push-pull rods 1 on the first detection mechanism 9 and the second detection mechanism 10 are combined into one. Since the same push-pull rod 1 is used, the limit assembly 600 is arranged in the middle of the entire push-pull rod 1, and cylinders 3 are arranged at both ends of the push-pull rod 1. The push-pull rod 1 is moved simultaneously on the first detection mechanism 9 and the second detection mechanism 10 by the mutual cooperation of the two cylinders 3. In addition, only one sleeve 220 is arranged outside the push-pull rod 1, and it is controlled by only one pulley 210 and a motor 230, which reduces energy consumption and complies with the principle of sustainable development. In addition, according to actual needs, the second detection mechanism 10 can also be exactly the same as the first detection mechanism 9 or can be changed or modified in other positions such as the shape of the fixing assembly 400.

[0047] Example 3

[0048] This embodiment is based on Embodiment 1.

[0049] The present embodiment provides a detection method based on a detection device for a differential half-shaft gear clearance, which includes the following steps based on a first detection mechanism 9: fixing the differential on a fixing assembly 400; controlling the push-pull rod 1 through an axial transmission assembly to pull the half-shaft gear of the differential to a position meshing with the housing of the differential; and controlling the half-shaft gear to rotate for more than 1 minute through a circumferential transmission assembly 200; at this time, the displacement sensor 5 records and obtains a deflection distance S1 of the half-shaft gear; and then controlling the push-pull rod 1 through an axial transmission assembly to pull the half-shaft gear to a position meshing with the planetary gear of the differential; and controlling the half-shaft gear to rotate for the same time through a circumferential transmission assembly 200; at this time, the displacement sensor 5 records and obtains a deflection distance S2 of the half-shaft gear, and the clearance of the half-shaft gear is obtained by the difference between S2 and S1.

[0050] Example 4

[0051] This embodiment is based on Embodiment 2.

[0052] The present embodiment provides a detection method based on a detection device for a differential half-shaft gear clearance, comprising the following steps based on a second detection mechanism 10 and a first detection mechanism 9: fixing the differential on a fixing assembly 400, controlling a push-pull rod 1 through an axial transmission assembly to pull the left half-shaft gear and the right half-shaft gear of the differential apart to a position meshing with the housing of the differential, and controlling the left half-shaft gear and the right half-shaft gear to rotate for more than 1 minute through a circumferential transmission assembly 200, at which time the deflection distances S3 and S4 of the left half-shaft gear and the right half-shaft gear are recorded and obtained by a displacement sensor 5;

[0053] Then, the axial transmission component controls the push-pull rod 1 to pull the left and right half-shaft gears to the position meshing with the planetary gears of the differential, and the circumferential transmission component 200 controls the left and right half-shaft gears to rotate for the same time. At this time, the displacement sensor 5 records and obtains the deflection distances S5 and S6 of the left and right half-shaft gears. The difference between S5 and S3 is calculated to obtain the clearance of the left half-shaft gear, and the difference between S6 and S4 is calculated to obtain the clearance of the right half-shaft gear.

[0054] In summary, the embodiments of the present invention provide a device and method for detecting axle gear clearance of a differential:

[0055] 1. The embodiment of the present invention provides a detection device for the clearance of the axle gears of a differential. The first detection mechanism 9 can pull the axle gears on the differential through the axial transmission assembly, and then rotate the axle gears through the circumferential transmission assembly 200. The rotation distance of the axle gears is recorded by the displacement sensor 5 to calculate the clearance of the axle gears, thereby realizing dynamic detection. Compared with the original static detection, it is no longer necessary to consider the error caused by the processing accuracy of the axle gears and the planetary gears themselves, so that the detection of the clearance of the axle gears is more accurate, thereby improving the tire rotation accuracy of the car during the turning process, reducing energy consumption, and saving energy. And because the differential has a left axle gear and a right axle gear, the second detection mechanism 10, which is mirror-symmetrical to the first detection mechanism 9, can simultaneously detect the clearance of the left axle gear and the clearance of the right axle gear when detecting the clearance of the axle gears of the differential, saving time, and detecting the clearance of the left axle gear and the clearance of the right axle gear separately, avoiding the influence of the clearance between the differential straight shaft and the planetary gear hole on the measurement of the clearance between the axle gear and the straight shaft.

[0056] Second, the embodiment of the present invention also provides a detection method based on a detection device for the clearance of axle gears of a differential. The detection method is implemented based on the first detection mechanism 9, and realizes dynamic detection of axle gears, thereby improving the detection accuracy of axle gear clearance compared with the existing static detection. The detection method is also implemented based on the second detection mechanism 10, and the left axle gear and the right axle gear can be detected separately, avoiding the influence of the clearance between the differential straight shaft and the planetary gear hole on the measurement of the clearance between the axle gear and the straight shaft, and further reducing the detection error of the clearance of the axle gear.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for detecting the backlash of axle gears of a differential, characterized in that: A detection device based on the differential half-shaft gear clearance, the detection device for the differential half-shaft gear clearance comprises a power mechanism and a first detection mechanism, the power mechanism is transmission-connected to the first detection mechanism, the first detection mechanism comprises a push-pull rod and a displacement sensor, the push-pull rod is provided with a circumferential transmission component, the displacement sensor is provided on both sides of the push-pull rod, and a fixing component is provided at the bottom of the circumferential transmission component and the displacement sensor; Also includes an axial transmission assembly, the axial transmission assembly includes a cylinder for pushing and pulling the push-pull rod, the cylinder is connected to the end of the push-pull rod; It also includes a second detection mechanism, which is mirror-symmetrical to the first detection mechanism in the axial direction of the push-pull rod, and the second detection mechanism is connected to the first detection mechanism through the push-pull rod; The method for detecting the differential axle gear clearance comprises the following steps: A1: Based on the first detection mechanism, the differential is fixed on the fixing assembly, the push-pull rod is controlled to pull the side gears of the differential to a position meshing with the housing of the differential, and the side gears are controlled by the circumferential transmission assembly to rotate for more than 1 min. At this time, the displacement sensor records and obtains the deflection distance S1 of the side gears; Then, the push-pull rod is controlled by the axial transmission component to pull the side gear to a position where it meshes with the planetary gear of the differential, and the side gear is controlled by the circumferential transmission component to rotate for the same time. At this time, the displacement sensor records and obtains the deflection distance S2 of the side gear, and the difference between S2 and S1 is calculated to obtain the clearance of the side gear. A2: Based on the second detection mechanism and the first detection mechanism, the differential is fixed on the fixing assembly, the push-pull rod is controlled by the axial transmission assembly to pull the left and right half-shaft gears of the differential apart to a position meshing with the housing of the differential, and the left and right half-shaft gears are controlled by the circumferential transmission assembly to rotate for more than 1 minute, at which time the deflection distances S3 and S4 of the left and right half-shaft gears are recorded and obtained by the displacement sensor; Then, the push-pull rod is controlled by the axial transmission component to pull the left and right half-shaft gears to the position meshing with the planetary gears of the differential respectively, and the circumferential transmission component controls the left and right half-shaft gears to rotate for the same time. At this time, the displacement sensor records and obtains the deflection distances S5 and S6 of the left and right half-shaft gears, and the difference between S5 and S3 is calculated to obtain the clearance of the left half-shaft gear, and the difference between S6 and S4 is calculated to obtain the clearance of the right half-shaft gear.

2. A method for detecting axle gear clearance of a differential according to claim 1, characterized in that: Based on the detection device of the differential half-shaft gear clearance, the first detection mechanism also includes a limit assembly, the limit assembly includes a limit plate and a pull claw, the pull claw includes a connecting part and a plurality of claw parts, the claw part is clamped with the limit plate, the connecting part is slidably connected with the push-pull rod, and the limit plate is connected to the fixed assembly.

3. A method for detecting axle gear clearance of a differential according to claim 2, characterized in that: Based on the detection device of the differential half-shaft gear clearance, the limit assembly also includes a compression spring and a telescopic sleeve, the compression spring is sleeved on the pull rod, and the telescopic sleeve is sleeved on the compression spring.

4. The method for detecting the backlash of axle gears of a differential according to claim 1, characterized in that: Based on the detection device of the differential half-shaft gear clearance, the power mechanism includes a motor, the circumferential transmission component includes a shaft sleeve, the shaft sleeve is sleeved on the push-pull rod, and the motor is drivingly connected to the shaft sleeve.

5. A method for detecting the backlash of axle gears of a differential according to claim 4, characterized in that: Based on the detection device of the differential half-shaft gear clearance, the fixing assembly includes a bearing seat, a bearing and a differential fixing seat, the bearing sleeve is arranged on the shaft sleeve, the bearing seat is connected to the bearing, and the differential fixing seat is connected to the bottom of the bearing seat.

6. A method for detecting the backlash of axle gears of a differential according to claim 5, characterized in that: Based on the detection device for the differential half-shaft gear clearance, the fixing assembly also includes a fixing plate, one side of the fixing plate is connected to the bearing seat, and the bottom of the fixing plate is connected to the differential fixing seat.

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