Differential measurement pad selection device

Abstract

The utility model discloses a differential measurement pad selecting device in the technical field of differential assembly, which comprises an operating platform, a gear shaft distance measuring tool and a differential shell shaft distance measuring tool are arranged on the operating platform side by side, and the gear shaft distance measuring tool can measure the distance from the friction end surfaces of two half axle gears to the axis of a planet wheel. The differential shell shaft distance measuring tool can measure the distance from the inner end faces of the two differential shells to the axis of the mounting shaft hole. According to the utility model, accurate measurement of the thickness of the wear-resistant gasket is realized, the yield of one-time assembly of the differential mechanism is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of differential assembly, in particular to a differential measurement and pad selection device. Background Art

[0002] The differential is a mechanism that enables the left and right drive wheels to rotate at different speeds. It is mainly composed of two half-axle gears, two planetary gears and a differential housing. When the car is turning or driving on an uneven road, the left and right wheels roll at different speeds, ensuring that the drive wheels on both sides perform pure rolling motion. In the production of differentials, if the tolerance of the differential clearance is small, or the processing of the differential housing is unstable, the upper and lower clearances will be inconsistent, and the tooth clearance between the half-axle gears and the planetary gears will be too large, causing impact noise during gear shifting, affecting the working efficiency and service life of the differential. In order to improve the assembly quality level of the differential half-axle gears and planetary gears, and avoid affecting product performance due to poor matching of parts, it is necessary to conduct 100% inspection of the upper and lower clearances of the differential to ensure assembly quality.

[0003] Patent document with announcement number CN210321686U discloses an automatic detection device for the gap of the upper parts of the differential, which realizes the automatic gap detection of the upper parts of the differential and reduces the labor intensity; however, the detection device can only detect the assembled differential to determine the assembly quality of the differential, and cannot directly measure the gap of the upper parts, and also cannot guarantee the yield rate of the differential assembly. Once the assembly quality of the differential is unqualified, it is necessary to replace the wear-resistant gasket for secondary assembly, which has a high work intensity.

[0004] Therefore, how to achieve direct measurement of the gap between the upper parts of the differential and ensure the accuracy of the gasket selection has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a differential measurement and selection device for the above technical problem, so as to realize the direct measurement of the gap between the upper layer components of the differential.

[0006] The technical solution adopted by the utility model is: a differential measuring and selecting pad device, comprising an operating table, on which a gear wheelbase measuring tool and a differential housing wheelbase measuring tool are arranged in parallel;

[0007] The gear wheelbase measuring tool comprises an upper profiling shell seat, a lower profiling shell seat, an upper displacement measuring assembly and a lower displacement measuring assembly; the lower profiling shell seat is installed on the operating table, and the top end of the lower profiling shell seat is provided with a lower positioning groove matched with the planetary gear shaft, the upper profiling shell seat can be lifted and arranged directly above the lower profiling shell seat, and the bottom end of the upper profiling shell seat is provided with a lower positioning groove matched with the planetary gear shaft; the lower displacement measuring assembly is arranged below the lower profiling shell seat, the top end of the lower displacement measuring assembly vertically extends into the lower profiling shell seat, and the lower displacement measuring assembly can vertically elastically support and drive the lower half-shaft gear to rotate horizontally; the upper displacement measuring assembly is arranged above the upper profiling shell seat, and the bottom end of the upper displacement measuring assembly vertically extends into the upper profiling shell seat, and the upper displacement measuring assembly can vertically elastically press down and allow the upper half-shaft gear to rotate horizontally;

[0008] The differential shell wheelbase measuring tool comprises a differential shell measuring seat, an axial hole centering pin, a shell end face measuring head and a lifting detection module. The differential shell measuring seat is installed on an operating table. The two axial hole centering pins are symmetrically arranged on the lateral sides of the differential shell measuring seat, and the two axial hole centering pins can move in opposite directions in the lateral direction. The shell end face measuring head can be longitudinally moved and arranged on one longitudinal side of the differential shell measuring seat. The lifting detection module is connected to the shell end face measuring head, and the lifting detection module can drive the shell end face measuring head to rise and fall and detect the distance between the inner end face of the differential shell and the mounting axial hole.

[0009] Preferably, the gear wheelbase measuring tool also includes a first frame, a first lifting cylinder, a pressing slide and a rotating drive mechanism, the first frame is vertically arranged on a longitudinal side of the lower contour shell seat, the pressing slide is vertically slidably connected to the first frame, the top of the upper contour shell seat is fixedly connected to the pressing slide, the cylinder end of the first lifting cylinder is fixedly connected to the first frame, and the piston end of the first lifting cylinder is fixedly connected to the pressing slide; the rotating drive mechanism is arranged below the operating table, and the rotating drive mechanism is transmission-connected to the lower displacement measuring assembly.

[0010] Preferably, the upper displacement measuring assembly and the lower displacement measuring assembly both include a positioning seat, a measuring rod, a spring and a displacement sensor. The positioning seat is fixedly connected to the downward pressing slide or the operating table. The measuring rod is rotatably arranged inside the positioning seat. The spring is sleeved on the measuring rod, and both ends of the spring are axially supported between the measuring rod and the positioning seat. One end of the measuring rod can be axially abutted against the half-shaft gear and circumferentially fixedly connected. The other end of the measuring rod is provided with a displacement sensor.

[0011] Preferably, the differential shell wheelbase measuring tool also includes a second frame, a vertical guide rail and a lifting platform, the second frame is fixedly mounted on one longitudinal side of the differential shell measuring seat, the two vertical guide rails are arranged in parallel on both lateral sides of the second frame, the lifting platform is slidably connected to the vertical guide rails, the shell end face measuring head is arranged on one longitudinal side of the lifting platform, and a horizontal telescopic cylinder is provided on the other side of the lifting platform, one end of the horizontal telescopic cylinder passes through the lifting platform and is fixedly connected to the shell end face measuring head.

[0012] Preferably, the lifting detection module includes a second lifting cylinder, an upper displacement sensor and a lower displacement sensor, the bottom end of the second lifting cylinder is fixedly connected to the operating table, the top end of the second lifting cylinder is fixedly connected to the lifting platform, and the upper displacement sensor and the lower displacement sensor are fixedly installed on the second frame for detecting the distance between the inner end face of the differential shell and the mounting shaft hole.

[0013] Beneficial effects of the utility model:

[0014] The present application adopts a direct measurement method, and supports and fixes the planetary gear shaft by upper and lower profiling shell seats arranged up and down to realize radial fixation of the planetary gear, and axially elastically supports the lower half-shaft gear by the lower displacement measuring component, and cooperates with the upper displacement measuring component to axially elastically press down the upper half-shaft gear, so as to realize the measurement of the distance between the friction end face of the half-shaft gear and the axis of the planetary gear under the meshing transmission state of the half-shaft gear and the planetary gear; at the same time, through the tightening effect of the two shaft hole centering pins on the mounting shaft holes on both sides of the differential housing, the reference positioning of the mounting shaft holes on the differential housing is realized, and the lifting and lowering of the housing end face measuring head in the inner cavity of the differential housing is realized to realize the measurement of the distance between the inner end face of the differential housing and the axis of the mounting shaft hole, thereby realizing the accurate measurement of the thickness size of the wear-resistant gasket, which not only improves the yield rate of the differential assembly in one time, but also reduces the labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the differential measuring pad selection device of the utility model;

[0016] Figure 2 It is a three-dimensional schematic diagram of the gear wheelbase measurement tool;

[0017] Figure 3 It is the side view of the gear wheelbase measurement tool;

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the gear wheelbase measurement tool;

[0019] Figure 5 A schematic diagram of the structure of an upper displacement measuring assembly or a lower displacement measuring assembly;

[0020] Figure 6It is a three-dimensional schematic diagram of the differential housing wheelbase measurement tool;

[0021] Figure 7 This is the side view of the differential housing wheelbase measurement tool;

[0022] Figure 8 This is a top view of the differential housing wheelbase measurement tool.

[0023] Description of reference numerals in the figures:

[0024] 1. Operating table; 2. Gear wheelbase measuring tool; 3. Differential housing wheelbase measuring tool; 4. Upper contoured housing seat; 5. Lower contoured housing seat; 6. Upper displacement measuring assembly; 7. Lower displacement measuring assembly; 8. Differential housing measuring seat; 9. Axis hole centering ejector pin; 10. Housing end face measuring head; 11. Lifting detection module; 12. First frame; 13. First lifting cylinder; 14. Pressing slide; 15. Rotating drive mechanism; 16. Positioning seat; 17. Measuring rod; 18. Spring; 19. Displacement sensor; 20. Second frame; 21. Vertical guide rail; 22. Lifting platform; 23. Horizontal telescopic cylinder; 24. Second lifting cylinder; 25. Upper displacement sensor; 26. Lower displacement sensor. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 communication 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.

[0028] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0029] Examples, such as Figure 1-Figure 8 As shown, a differential measuring and selecting gasket device is used to directly measure the gap between the upper parts of the differential; the device includes an operating table 1, on which a gear wheelbase measuring tool 2 and a differential housing wheelbase measuring tool 3 are arranged in parallel, that is, the operating table 1 is horizontally arranged in the lateral direction, and the gear wheelbase measuring tool 2 and the differential housing wheelbase measuring tool 3 are installed on the operating table 1 on the left and the right, respectively. The gear wheelbase measuring tool 2 is used to measure the distance L1 from the friction end faces of the two half-shaft gears to the axis of the planetary gear; the differential housing wheelbase measuring tool 3 is used to measure the distance L2 from the inner end faces of the two differential housings to the axis of the mounting shaft hole. The gap between the upper parts of the differential L=L2-L1, that is, the thickness of the wear-resistant gasket is L2-L1.

[0030] The gear wheelbase measuring tool 2 includes an upper profiling shell seat 4, a lower profiling shell seat 5, an upper displacement measuring component 6 and a lower displacement measuring component 7, wherein the lower profiling shell seat 5 is fixedly mounted on the operating table 1, and both lateral sides of the top of the lower profiling shell seat 5 are provided with lower positioning grooves matching with the planetary gear shafts, and the lower positioning grooves are used to radially limit the planetary gear shafts, that is, in the vertical direction, the lower positioning grooves are used to position and support the planetary gear shafts, thereby achieving the support and fixation of two planetary gears. The upper profiling shell seat 4 can be lifted and lowered and arranged directly above the lower profiling shell seat 5, and the bottom end of the upper profiling shell seat 4 is provided with an upper positioning groove matching with the planetary gear shafts, and the upper positioning grooves are used to radially limit the planetary gear shafts, that is, in the vertical direction, the upper positioning grooves are used to position and press down the planetary gear shafts.

[0031] The lower displacement measuring component 7 is arranged below the lower contoured shell seat 5, and the top end of the lower displacement measuring component 7 extends vertically into the lower contoured shell seat 5. The lower displacement measuring component 7 can vertically elastically support and drive the lower half-shaft gear to rotate horizontally to obtain the distance between the friction end surface of the lower half-shaft gear and the axis of the planetary gear shaft; the upper displacement measuring component 6 is arranged above the upper contoured shell seat 4, and the bottom end of the upper displacement measuring component 6 extends vertically into the upper contoured shell seat 4. The upper displacement measuring component 6 can vertically elastically press down and allow the upper half-shaft gear to rotate horizontally to obtain the distance between the friction end surface of the upper half-shaft gear and the axis of the planetary gear shaft.

[0032] The differential housing wheelbase measuring tool 3 includes a differential housing measuring seat 8, an axial hole centering ejector pin 9, a housing end face measuring head 10 and a lifting detection module 11, wherein the differential housing measuring seat 8 is fixedly mounted on the operating table 1, and the differential housing measuring seat 8 is used to place the differential housing; the number of the axial hole centering ejector pins 9 is two, and the two axial hole centering ejector pins 9 are symmetrically arranged on the lateral sides of the differential housing measuring seat 8, that is, the two axial hole centering ejector pins 9 are installed on the left and right sides of the differential housing measuring seat 8, and the two axial hole centering ejector pins 9 can move in opposite directions along the lateral direction to clamp or release the differential housing measuring seat 8.

[0033] The housing end face measuring head 10 is arranged on one longitudinal side of the differential housing measuring seat 8, and the housing end face measuring head 10 can move longitudinally and enter and exit the inner cavity of the differential housing; the lifting detection module 11 is connected to the housing end face measuring head 10, and the lifting detection module 11 can drive the housing end face measuring head 10 to rise and fall and detect the distance between the inner end face of the differential housing and the axis of the mounting shaft hole on the differential housing.

[0034] The present application adopts a direct measurement method, and the planetary gear axle is supported and fixed by the upper and lower profiling shell seats 4 and 5, so as to realize radial fixation of the planetary gear, and the lower half-shaft gear is axially elastically supported by the lower displacement measuring component 7, and the upper half-shaft gear is axially elastically pressed down by the upper displacement measuring component 6, so as to realize the measurement of the distance between the friction end face of the half-shaft gear and the axis of the planetary gear under the meshing transmission state of the half-shaft gear and the planetary gear; at the same time, the two shaft hole centering ejectors 9 are used to tighten the mounting shaft holes on both sides of the differential housing, so as to realize the reference positioning of the mounting shaft holes on the differential housing, and cooperate with the lifting and lowering of the housing end face measuring head 10 in the inner cavity of the differential housing to realize the measurement of the distance between the inner end face of the differential housing and the axis of the mounting shaft hole, thereby realizing the accurate measurement of the thickness of the wear-resistant gasket, which not only improves the yield rate of the differential assembly in one time, but also reduces the labor intensity.

[0035] It should be noted that the front, back, left, right, up, and down directions in this application are all based on the standing position of the operator when working; and the lateral direction in this application is consistent with the left and right direction, and the front and back direction is consistent with the longitudinal direction.

[0036] In a specific implementation, Figure 1-Figure 4As shown, the gear wheelbase measuring tool 2 also includes a first frame 12, a first lifting cylinder 13, a pressing slide 14 and a rotating drive mechanism 15, wherein the first frame 12 is vertically arranged on one longitudinal side of the lower profiling shell seat 5, that is, the first frame 12 is arranged on the rear side of the lower profiling shell seat 5; the pressing slide 14 is slidably connected to the first frame 12 in the vertical direction, and the top of the upper profiling shell seat 4 is fixedly connected to the pressing slide 14, the cylinder end of the first lifting cylinder 13 is fixedly connected to the top of the first frame 12, and the piston end of the first lifting cylinder 13 is fixedly connected to the pressing slide 14, so that the pressing slide 14 is driven to rise and fall by the extension and shortening of the first lifting cylinder 13, thereby realizing the rise and fall of the upper profiling shell seat 4, so that the upper profiling shell seat 4 presses the planetary gear axle or releases the planetary gear axle.

[0037] The rotary drive mechanism 15 is disposed below the operating table 1 and is located at one side of the lower displacement measuring assembly 7. The rotary drive mechanism 15 is transmission-connected to the lower displacement measuring assembly 7 and is used to drive the lower half-shaft gear placed in the lower contoured housing seat 5 to rotate horizontally.

[0038] It should be noted that the upper displacement measuring assembly 6 and the lower displacement measuring assembly 7 can adopt any known structure, and only one of them is described in detail as an exemplary description below: Figure 5 As shown, the upper displacement measuring assembly 6 and the lower displacement measuring assembly 7 both include a positioning seat 16, a measuring rod 17, a spring 18 and a displacement sensor 19. One end of the positioning seat 16 is detachably fixedly connected to the downward pressing slide 14 or the operating table 1. The measuring rod 17 is arranged inside the positioning seat 16 along the vertical direction, and the measuring rod 17 is connected to the positioning seat 16 through a linear bearing, so that the measuring rod 17 can be lifted and rotated relative to the positioning seat 16; the spring 18 is sleeved on the measuring rod 17, and both ends of the spring 18 are axially supported between the measuring rod 17 and the positioning seat 16; one end of the measuring rod 17 can be axially abutted against the half-shaft gear and circumferentially fixedly connected, and the other end of the measuring rod 17 passes through the outside of the positioning seat and is provided with a displacement sensor 19, which is used to detect the axial runout of the measuring rod 17 during the meshing transmission process of the half-shaft gear and the planetary gear.

[0039] In a specific embodiment, if Figure 6-Figure 8 As shown, the differential housing wheelbase measuring tool 3 also includes a second frame 20, a vertical guide rail 21 and a lifting platform 22; wherein, the second frame 20 is fixedly installed on one longitudinal side of the differential housing measuring seat 8, that is, the second frame 20 is fixedly installed on the rear side of the differential housing measuring seat 8; the two vertical guide rails 21 are arranged in parallel on the lateral sides of the second frame 20, that is, the two vertical guide rails 21 are installed on the left and right sides of the second frame 20; the lifting platform 22 is slidably connected to the vertical guide rail 21 so that the lifting platform 22 can rise or fall.

[0040] The shell end face measuring head 10 is arranged on one longitudinal side of the lifting platform 22, and a horizontal telescopic cylinder 23 is provided on the other side of the lifting platform 22. One end of the horizontal telescopic cylinder 23 passes through the lifting platform 22 and is fixedly connected to the shell end face measuring head 10, that is, the shell end face measuring head 10 is located on the front side of the lifting platform 22, the horizontal telescopic cylinder 23 is located on the rear side of the lifting platform 22, and the cylinder body end of the horizontal telescopic cylinder 23 is fixedly connected to the lifting platform 22, and the piston end of the horizontal telescopic cylinder 23 passes through the avoidance through hole on the lifting platform 22 and is fixedly connected to the shell end face measuring head 10, so as to drive the shell end face measuring head 10 to enter and exit the inner cavity of the differential housing through the extension and shortening of the horizontal telescopic cylinder 23.

[0041] It should be noted that the lifting detection module 11 can adopt any known structure, and the following is only an exemplary description of one of them in detail: Figure 6 , Figure 8 As shown, the lifting detection module 11 includes a second lifting cylinder 24, an upper displacement sensor 25 and a lower displacement sensor 26, wherein the second lifting cylinder 24 is installed on the rear side of the lifting platform 22, and the bottom end of the second lifting cylinder 24 is fixedly connected to the operating table 1, and the top end of the second lifting cylinder 24 is fixedly connected to the lifting platform 22, so as to drive the lifting platform 22 to rise and fall through the extension and contraction of the second lifting cylinder 24, thereby driving the shell end face measuring head 10 to rise and fall.

[0042] The upper displacement sensor 25 and the lower displacement sensor 26 are fixedly mounted on the second frame 20, and are used to detect the distance between the inner end face of the differential housing and the planetary gear shaft. Specifically, the upper displacement sensor 25 is mounted on the left side of the second frame 20, and is used to detect the distance from the reference position to the upper limit position of the housing end face measuring head 10; the lower displacement sensor 26 is mounted on the right side of the second frame 20, and is used to detect the distance from the reference position to the lower limit position of the housing end face measuring head 10.

[0043] The working process of the device of this application is as follows:

[0044] During the actual measurement process, the two half-axle gears, two planetary gears and the planetary axle of the differential are assembled and placed on the lower contoured shell seat 5 (the planetary axle is placed in the lower positioning groove at the top of the lower contoured shell seat 5). The upper contoured shell seat 4 is driven to move downward and pressed onto the planetary axle by the descent of the first lifting cylinder 13 and the lower pressing slide 14, that is, the upper half of the planetary axle is located in the lower positioning groove at the bottom end of the upper contoured shell seat 4. In this way, under the pressure of the upper contoured shell seat 4, the friction end surface of the lower half-axle gear abuts against the lower displacement measuring assembly 7 and drives the measuring rod 17 of the lower displacement measuring assembly 7 to move downward, and the friction end surface of the upper half-axle gear abuts against the upper displacement measuring assembly 6 and drives the measuring rod 17 of the upper displacement measuring assembly 6 to move upward.

[0045] Driven by the rotary drive mechanism 15, the top end of the measuring rod 17 of the lower displacement measuring assembly 7 is connected to the lower half-shaft gear through a spline circumferential transmission, thereby driving the lower half-shaft gear to rotate horizontally. Through the meshing transmission of the half-shaft gear and the planetary gear, the upper half-shaft gear and the lower half-shaft gear rotate synchronously, and in the rotation process, the measuring rod 17 of the upper displacement measuring assembly 6 and the lower displacement measuring assembly 7 axially elastically presses the half-shaft gear under the elastic force of the spring 18, thereby measuring the maximum and minimum values ​​of the meshing of the half-shaft gear and the planetary gear during the rotation process, and the maximum value is taken as the distance L1 from the friction end face of the half-shaft gear to the planetary gear shaft.

[0046] Place the differential housing (differential housing for short) on the differential housing measuring seat 8, control the two shaft hole centering ejector pins 9 to approach each other, that is, push the shaft hole centering ejector pin 9 on the left side of the differential housing measuring seat 8 to the right, and push the shaft hole centering ejector pin 9 on the right side of the differential housing measuring seat 8 to the left, until the two shaft hole centering ejector pins 9 are inserted into the mounting shaft holes on the left and right sides of the differential housing (the differential housing moves upward and is out of contact with the differential housing measuring seat 8); control the housing end surface measuring head 10 to move longitudinally and extend into the inner cavity of the differential housing, first drive the housing end surface measuring head 10 downward by the second lifting cylinder 24 The shell end face measuring head 10 is lowered until the lower measuring surface of the shell end face measuring head 10 fits with the lower end face of the differential shell. At this time, the lower displacement sensor 26 measures the lower displacement of the shell end face measuring head 10, and indirectly obtains the distance L2 from the lower end face of the differential shell to the mounting shaft hole (for installing the planetary gear shaft); then the second lifting cylinder 24 is used to drive the shell end face measuring head 10 to rise until the upper measuring surface of the shell end face measuring head 10 fits with the upper end face of the differential shell. The upper displacement sensor 25 measures the upper displacement of the shell end face measuring head 10, and indirectly obtains the distance L2 from the upper end face of the differential shell to the mounting shaft hole.

[0047] Finally, the wear-resistant gasket thickness of the upper half-shaft gear and the wear-resistant gasket thickness of the lower half-shaft gear are calculated respectively by measuring the differential housing size and the half-shaft gear size.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A differential measurement and selection device, characterized in that: It comprises an operating table (1), on which a gear wheelbase measuring tool (2) and a differential housing wheelbase measuring tool (3) are arranged in parallel; The gear wheelbase measuring tool (2) comprises an upper profiling shell seat (4), a lower profiling shell seat (5), an upper displacement measuring assembly (6) and a lower displacement measuring assembly (7); the lower profiling shell seat (5) is mounted on the operating table (1), and the top of the lower profiling shell seat (5) is provided with a lower positioning groove matching the planetary gear shaft; the upper profiling shell seat (4) is arranged to be liftable above the lower profiling shell seat (5), and the bottom of the upper profiling shell seat (4) is provided with a lower positioning groove matching the planetary gear shaft; the lower displacement measuring assembly (7) is provided with a lower positioning groove matching the planetary gear shaft; The component (7) is arranged below the lower profiling shell seat (5), the top end of the lower displacement measuring component (7) vertically extends into the lower profiling shell seat (5), and the lower displacement measuring component (7) can vertically elastically support and drive the lower half-shaft gear to rotate horizontally; the upper displacement measuring component (6) is arranged above the upper profiling shell seat (4), the bottom end of the upper displacement measuring component (6) vertically extends into the upper profiling shell seat (4), and the upper displacement measuring component (6) can vertically elastically press downward and allow the upper half-shaft gear to rotate horizontally; The differential housing wheelbase measuring tool (3) comprises a differential housing measuring seat (8), an axial hole centering ejector pin (9), a housing end face measuring head (10) and a lifting detection module (11); the differential housing measuring seat (8) is mounted on an operating table (1); two axial hole centering ejectors (9) are symmetrically arranged on two lateral sides of the differential housing measuring seat (8); and the two axial hole centering ejectors (9) can move in opposite directions in the lateral direction; the housing end face measuring head (10) can be longitudinally moved on one longitudinal side of the differential housing measuring seat (8); and the lifting detection module (11) is connected to the housing end face measuring head (10); and the lifting detection module (11) can drive the housing end face measuring head (10) to rise and fall and detect the distance between the inner end face of the differential housing and the mounting axial hole.

2. A differential measurement and selection device according to claim 1, characterized in that: The gear wheelbase measuring tool (2) further comprises a first frame (12), a first lifting cylinder (13), a pressing slide (14) and a rotary drive mechanism (15); the first frame (12) is vertically arranged on a longitudinal side of the lower profiling shell seat (5); the pressing slide (14) is vertically slidably connected to the first frame (12); the top end of the upper profiling shell seat (4) is fixedly connected to the pressing slide (14); the cylinder end of the first lifting cylinder (13) is fixedly connected to the first frame (12); the piston end of the first lifting cylinder (13) is fixedly connected to the pressing slide (14); the rotary drive mechanism (15) is arranged below the operating table (1), and the rotary drive mechanism (15) is transmission-connected to the lower displacement measuring assembly (7).

3. A differential measurement and selection device according to claim 2, characterized in that: The upper displacement measuring assembly (6) and the lower displacement measuring assembly (7) both comprise a positioning seat (16), a measuring rod (17), a spring (18) and a displacement sensor (19); the positioning seat (16) is fixedly connected to the downward pressing slide (14) or the operating table (1); the measuring rod (17) is rotatably arranged inside the positioning seat (16); the spring (18) is sleeved on the measuring rod (17), and both ends of the spring (18) are axially supported between the measuring rod (17) and the positioning seat (16); one end of the measuring rod (17) can be axially abutted against the half-axle gear and circumferentially fixedly connected; the other end of the measuring rod (17) is provided with a displacement sensor (19).

4. A differential measurement and selection device according to claim 1, characterized in that: The differential housing wheelbase measuring tool (3) further comprises a second frame (20), a vertical guide rail (21) and a lifting platform (22); the second frame (20) is fixedly mounted on one longitudinal side of the differential housing measuring seat (8); two vertical guide rails (21) are arranged in parallel on two lateral sides of the second frame (20); the lifting platform (22) is slidably connected to the vertical guide rail (21); the housing end surface measuring head (10) is arranged on one longitudinal side of the lifting platform (22); a horizontal telescopic cylinder (23) is arranged on the other side of the lifting platform (22); one end of the horizontal telescopic cylinder (23) passes through the lifting platform (22) and is fixedly connected to the housing end surface measuring head (10).

5. A differential measurement and selection device according to claim 4, characterized in that: The lifting detection module (11) comprises a second lifting cylinder (24), an upper displacement sensor (25) and a lower displacement sensor (26); the bottom end of the second lifting cylinder (24) is fixedly connected to the operating table (1); the top end of the second lifting cylinder (24) is fixedly connected to the lifting platform (22); the upper displacement sensor (25) and the lower displacement sensor (26) are fixedly mounted on the second frame (20) and are used to detect the distance between the inner end surface of the differential housing and the mounting shaft hole.

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