Detection device for differential shell of electric automobile

Abstract

The utility model relates to the technical field of differential housing detection, in particular to an electric automobile differential housing detection device, which comprises a workbench, a detection seat, an inner diameter detection mechanism and an outer diameter detection mechanism, and is characterized in that the detection seat is mounted on the upper surface of the workbench and is used for fixing a differential housing; the inner diameter detection mechanism is installed on the detection seat through a first driving assembly, and the outer diameter detection mechanism is installed on the workbench through a second driving assembly. According to the utility model, the first driving assembly drives the inner diameter detection mechanism to move along the Z-axis direction and rotate along the axis of the first driving assembly so as to detect the inner diameter of each position of the differential housing, and the second driving assembly drives the outer diameter detection mechanism to move along the Y-axis direction and the Z-axis direction. The outer diameter of each position of the differential shell is detected, and the thickness of the differential shell is obtained through the inner diameter and the outer diameter of the differential shell, so that the detection efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to differential mechanism shell detection technical field especially a kind of electric vehicle differential mechanism shell detection device. BACKGROUND

[0002] Electric vehicle is the advanced technology of power control and drive of integrated vehicle using electric energy as power source, and it is the car with advanced technology and new technology and new structure, wherein: differential mechanism is important part in electric vehicle, and automobile differential mechanism can make left and right (or front and rear) drive wheels rotate at different speeds, differential mechanism is generally installed in special shell, and it protects and fixes the transmission structure inside it. The accuracy of differential mechanism shell size is directly related to whether differential mechanism can work smoothly, because, in the process of differential mechanism shell production, differential mechanism shell inner diameter, outer diameter and thickness are detected by detection device, therefore, we urgently need a kind of electric vehicle differential mechanism shell detection device.

[0003] At present, detection device can only detect the inner diameter of differential mechanism shell at a certain position, and cannot detect the inner diameter of differential mechanism shell at multiple positions, and its detection speed is slow, which will affect the detection efficiency of differential mechanism shell, in addition, the existing detection device can only detect the inner diameter of differential mechanism shell, and the outer diameter and thickness still need to be detected separately, which reduces practicability. INVENTION CONTENTS

[0004] In view of the above-mentioned shortcomings in the prior art, the present application provides an electric vehicle differential mechanism shell detection device, which can detect the inner diameter, outer diameter and thickness of the differential mechanism shell at each position by improving the structure of the detection device, thereby improving the detection efficiency and the practicability of the entire detection device.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] An electric vehicle differential mechanism shell detection device comprises a workbench, a detection seat, an inner diameter detection mechanism and an outer diameter detection mechanism. The detection seat is installed on the upper surface of the workbench, and is used to fix the differential mechanism shell. The inner diameter detection mechanism is installed on the detection seat through a first driving assembly. The first driving assembly is used to drive the inner diameter detection mechanism to move along the Z-axis direction and to rotate along the axis of the first driving assembly, so as to detect the inner diameter of the differential mechanism shell at each position. The outer diameter detection mechanism is installed on the workbench through a second driving assembly. The second driving assembly is used to drive the outer diameter detection mechanism to move along the Y-axis direction and the Z-axis direction, so as to detect the outer diameter of the differential mechanism shell at each position.

[0007] Thus, the inner diameter detection mechanism is driven by the first driving assembly to move along the Z-axis direction and rotate along the axis of the first driving assembly, so as to realize the detection of the inner diameter of each position of the differential housing; the outer diameter detection mechanism is driven by the second driving assembly to move along the Y-axis direction and the Z-axis direction, so as to realize the detection of the outer diameter of each position of the differential housing; and the thickness of the differential housing is obtained through the inner diameter and the outer diameter of the differential housing. Compared with the existing single inner diameter detection mode, the present application has a simple structure, is easy to operate, can realize the detection of the inner diameter, the outer diameter and the thickness of each position of the differential housing, and can improve the detection efficiency and the practicability of the entire detection device.

[0008] As a further improvement of the above technical solution: the inner diameter detection mechanism comprises an inner diameter detection block and a first distance sensor, the side of the inner diameter detection block away from the differential housing is connected with the driving end of the first driving assembly, the side of the inner diameter detection block close to the differential housing is an arc surface, and the first distance sensor is embedded on the side of the inner diameter detection block close to the differential housing. Thus, through the design of the arc surface of the inner diameter detection block, the inner diameter detection block can be ensured to be in close contact with the inner wall of the differential housing, so as to improve the detection accuracy of the inner diameter of the differential housing.

[0009] As a further improvement of the above technical solution: the first driving assembly comprises a first driving unit and a second driving unit, the first driving unit is connected with the detection seat, the driving end of the first driving unit is connected with the second driving unit, and the driving end of the second driving unit is connected with the side of the inner diameter detection block away from the differential housing; the first driving unit is used to drive the inner diameter detection block to move along the Z-axis direction, and the second driving unit is used to drive the inner diameter detection block to rotate along the axis of the second driving unit.

[0010] As a further improvement of the above technical solution: the outer diameter detection mechanism comprises an outer diameter detection block and a second distance sensor, the side of the outer diameter detection block away from the differential housing is hingedly connected with the driving end of the second driving assembly, the side of the outer diameter detection block close to the differential housing is a circular arc surface, and the second distance sensor is embedded on the side of the outer diameter detection block close to the differential housing. Thus, through the design of the arc surface of the outer diameter detection module, the outer diameter detection block can be ensured to be in close contact with the outer wall of the differential housing, so as to improve the detection accuracy of the outer diameter of the differential housing.

[0011] As a further improvement of the above technical solution: the second driving assembly comprises a third driving unit and a fourth driving unit, the third driving unit is connected with the workbench, the driving end of the third driving unit is connected with the fourth driving unit, and the driving end of the fourth driving unit is hingedly connected with the side of the outer diameter detection block away from the differential housing.

[0012] As a further improvement of the above technical solution: the detection seat is provided with a limiting groove away from one side of the workbench; the detection seat is embedded with a rotating member, and the rotating member is used to realize the rotating connection between the detection seat and the workbench. In this way, the differential housing to be detected can be fixed by the limiting groove, so as to ensure that the differential housing does not move relative to the detection seat.

[0013] As a further improvement of the above technical solution: the two inner diameter detection mechanisms are arranged opposite to each other; and the second driving unit corresponds to the inner diameter detection mechanism one by one. In this way, the two inner diameter detection mechanisms can simultaneously detect the inner diameters of the positions on both sides of the differential housing, so as to improve the detection efficiency of the inner diameter of the differential housing.

[0014] As a further improvement of the above technical solution: the first driving unit includes a first driving member and a first fixed block, the first driving member is connected with the detection seat, and the driving end of the first driving member is connected with the first fixed block; the second driving unit includes a second driving member, a rotating rod, a second fixed block and a third driving member, the second driving member is connected with the first fixed block, the driving end of the second driving member is connected with one end of the rotating rod, the other end of the rotating rod is rotatably connected with the first fixed block, the second fixed block is sleeved on the rotating rod and fixedly connected with the second fixed block, the third driving member is connected with the second fixed block, and the driving end of the third driving member is connected with the side of the inner diameter detection block away from the differential housing.

[0015] As a further improvement of the above technical solution: the two outer diameter detection mechanisms are arranged opposite to each other on both sides of the detection seat; and the fourth driving unit corresponds to the outer diameter detection mechanism one by one. In this way, the two outer diameter detection mechanisms can simultaneously detect the outer diameters of the positions on both sides of the differential housing, so as to improve the detection efficiency of the outer diameter of the differential housing.

[0016] As a further improvement of the above technical solution: the third driving unit comprises a fourth driving member, a bidirectional threaded rod and two sliders, the fourth driving member is connected with the workbench, the driving end of the fourth driving member is connected with one end of the bidirectional threaded rod, the other end of the bidirectional threaded rod is rotatably connected with the workbench, the middle position of the bidirectional threaded rod penetrates through the workbench and is rotatably connected with the workbench, and the two sliders are respectively located on the two sides of the detection seat and are sleeved on the bidirectional threaded rod and are threadedly connected with the bidirectional threaded rod; the fourth driving unit comprises a fifth driving member, a third fixed block and a supporting rod, the fifth driving member is connected with the slider, the driving end of the fifth driving member is connected with the third fixed block, one end of the supporting rod is connected with the third fixed block, and the other end of the supporting rod is hingedly connected with the side of the outer diameter detection block away from the differential housing. Thus, by the hinged connection of the supporting rod and the outer diameter detection block, the outer diameter detection block can rotate relative to the supporting rod, so that the outer diameter detection block can always be in close contact with the outer wall of the differential housing during the detection of the outer diameter of each position of the differential housing, thereby further improving the detection accuracy of the outer diameter of the differential housing.

[0017] The beneficial effects of the utility model are as follows:

[0018] The inner diameter detection mechanism is driven by the first driving assembly to move along the Z-axis direction and rotate along the axis of the first driving assembly, so as to realize the detection of the inner diameter of each position of the differential housing. The outer diameter detection mechanism is driven by the second driving assembly to move along the Y-axis direction and the Z-axis direction, so as to realize the detection of the outer diameter of each position of the differential housing. The thickness of the differential housing is obtained by the inner diameter and the outer diameter of the differential housing. Compared with the existing single inner diameter detection mode, this mode has the advantages of simple structure, convenient operation, and the ability to realize the detection of the inner diameter, the outer diameter and the thickness of each position of the differential housing, thereby improving the detection efficiency and the practicability of the entire detection device.

[0019] The utility model also has the following advantages:

[0020] 1. The inner diameter detection block and the outer diameter detection block are designed to ensure that the inner diameter detection block is in close contact with the inner wall of the differential housing, thereby improving the detection accuracy of the inner and outer diameters of the differential housing.

[0021] 2. The two inner diameter detection mechanisms and the two outer diameter detection mechanisms can simultaneously detect the inner and outer diameters of the two sides of the differential housing, thereby improving the detection efficiency of the inner and outer diameters of the differential housing.

[0022] 3. The utility model discloses a support rod and the outer diameter detection block hinged connection mode can make the outer diameter detection block relative support rod rotate, thus, can ensure when the differential mechanism shell each position's outer diameter is detected, the outer diameter detection block is always with differential mechanism shell's outer wall and is pasted together to further improve the detection precision of differential mechanism shell outer diameter. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structure schematic drawing of electric automobile differential mechanism shell detection device of the utility model;

[0024] Figure 2 It is the structure schematic drawing of detection seat of the utility model;

[0025] Figure 3 It is the structure schematic drawing of inner diameter detection mechanism and no.

[0026] Figure 4 It is the structure schematic drawing of outer diameter detection mechanism and no.

[0027] Figure 5 It is the structure schematic drawing of the utility model's differential mechanism shell detection process; Figure 4

[0028] Figure 6 It is the effect picture of differential mechanism shell detection process of the utility model;

[0029] Figure 7 It is the partial section effect picture of differential mechanism shell detection process of the utility model;

[0030] Figure 8 It is the partial front view of differential mechanism shell detection process of the utility model.

[0031] Among them: 1, workbench;

[0032] 2, detection seat;201, limit slot;

[0033] 3, inner diameter detection mechanism;

[0034] 301, inner diameter detection block;302, first distance sensor;

[0035] 4, no.

[0036] 401, no. 4011, no. 4012, first fixed block;402, no. 4021, no. 4022, rotating rod;4023, second fixed block;4024, no.

[0037] 5, outer diameter detection mechanism; ​

[0038] 501, outer diameter detection block; 502, second distance sensor;

[0039] 6, second driving assembly;

[0040] 601, third driving unit; 6011, fourth driving piece; 6012, bidirectional threaded rod; 6013, sliding block; 602, fourth driving unit; 6021, fifth driving piece; 6022, third fixed block; 6023, support rod. DETAILED DESCRIPTION

[0041] The specific implementation of the present application will be described below in conjunction with the accompanying drawings.

[0042] As Figures 1 to 8 shown, is the optimal embodiment of the present application, the electric vehicle differential housing detection device of the embodiment, including: workbench 1, detection seat 2, inner diameter detection mechanism 3 and outer diameter detection mechanism 5, detection seat 2 is installed on the upper surface of workbench 1, and the detection seat 2 is used for fixing the differential housing, the inner diameter detection mechanism 3 is installed on the detection seat 2 through the first driving assembly 4, the first driving assembly 4 is used for driving the inner diameter detection mechanism 3 to move along the Z axis direction and driving the inner diameter detection mechanism 3 to rotate along the axis of the first driving assembly 4, to realize the detection of the inner diameter of each position of the differential housing, the outer diameter detection mechanism 5 is installed on the workbench 1 through the second driving assembly 6, the second driving assembly 6 is used for driving the outer diameter detection mechanism 5 to move along the Y axis direction and the Z axis direction, to realize the detection of the outer diameter of each position of the differential housing. Therefore, through the first driving assembly 4 driving the inner diameter detection mechanism 3 to move along the Z axis direction and rotate along the axis of the first driving assembly 4, to realize the detection of the inner diameter of each position of the differential housing, through the second driving assembly 6 driving the outer diameter detection mechanism 5 to move along the Y axis direction and the Z axis direction, to realize the detection of the outer diameter of each position of the differential housing, and through the inner diameter and the outer diameter of the differential housing, the thickness of the differential housing is obtained, compared with the existing single inner diameter detection mode, this mode has simple structure, is convenient to operate, can realize the detection of the inner diameter, the outer diameter and the thickness of each position of the differential housing, to improve the detection efficiency, and improve the practicability of the whole detection device.

[0043] In the embodiment, the inner diameter detection mechanism 3 includes: inner diameter detection block 301 and first distance sensor 302, the side of the inner diameter detection block 301 away from the differential housing is connected with the driving end of the first driving assembly 4, the side of the inner diameter detection block 301 close to the differential housing is arc surface, and the first distance sensor 302 is embedded on the side of the inner diameter detection block 301 close to the differential housing. Therefore, through the design of the arc surface of the inner diameter detection block 301, the inner diameter detection block 301 can be ensured to be in close contact with the inner wall of the differential housing, so as to improve the detection accuracy of the inner diameter of the differential housing.

[0044] In the embodiment, the first driving assembly 4 comprises a first driving unit 401 and a second driving unit 402, the first driving unit 401 is connected with the detection seat 2, a driving end of the first driving unit 401 is connected with the second driving unit 402, and a driving end of the second driving unit 402 is connected with the inner diameter detection block 301 away from the differential housing. The first driving unit 401 is used to drive the inner diameter detection block 301 to move along the Z-axis direction, and the second driving unit 402 is used to drive the inner diameter detection block 301 to rotate along the axis of the second driving unit 402. The inner diameter detection mechanism 3 is provided in two, and the two inner diameter detection mechanisms 3 are oppositely arranged. The second driving unit 402 corresponds to the inner diameter detection mechanism 3 one by one. The first driving unit 401 comprises a first driving piece 4011 and a first fixed block 4012, the first driving piece 4011 is connected with the detection seat 2, and a driving end of the first driving piece 4011 is connected with the first fixed block 4012. The second driving unit 402 comprises a second driving piece 4021, a rotating rod 4022, a second fixed block 4023 and a third driving piece 4024, the second driving piece 4021 is connected with the first fixed block 4012, a driving end of the second driving piece 4021 is connected with one end of the rotating rod 4022, the other end of the rotating rod 4022 is rotationally connected with the first fixed block 4012, the second fixed block 4023 is sleeved on the rotating rod 4022 and is fixedly connected with the second fixed block 4023, and the third driving piece 4024 is connected with the second fixed block 4023. A driving end of the third driving piece 4024 is connected with the inner diameter detection block 301 away from the differential housing. Therefore, the two inner diameter detection mechanisms 3 can simultaneously detect the inner diameters of the positions on both sides of the differential housing, so as to improve the detection efficiency of the inner diameter of the differential housing.

[0045] For example, the first driving piece 4011 is a cylinder, the second driving piece 4021 is a motor, and the third driving piece 4024 is a cylinder.

[0046] In the embodiment, the outer diameter detection mechanism 5 comprises an outer diameter detection block 501 and a second distance sensor 502. The outer diameter detection block 501 away from the differential housing is hingedly connected with the driving end of the second driving assembly 6, the side of the outer diameter detection block 501 close to the differential housing is a circular arc surface, and the second distance sensor 502 is embedded on the side of the outer diameter detection block 501 close to the differential housing. Therefore, through the design of the arc surface of the outer diameter detection mechanism, the outer diameter detection block 501 can be ensured to be in close contact with the outer wall of the differential housing, so as to improve the detection accuracy of the outer diameter of the differential housing.

[0047] In the embodiment, the second driving assembly 6 comprises a third driving unit 601 and a fourth driving unit 602, the third driving unit 601 is connected with the workbench 1, a driving end of the third driving unit 601 is connected with the fourth driving unit 602, and a driving end of the fourth driving unit 602 is hingedly connected with the side of the outer diameter detection block 501 away from the differential housing. The outer diameter detection mechanism 5 is provided in two, and the two outer diameter detection mechanisms 5 are oppositely arranged on the two sides of the detection seat 2. The fourth driving unit 602 corresponds to the outer diameter detection mechanism 5. The third driving unit 601 comprises a fourth driving piece 6011, a bidirectional threaded rod 6012 and two sliding blocks 6013. The fourth driving piece 6011 is connected with the workbench 1, a driving end of the fourth driving piece 6011 is connected with one end of the bidirectional threaded rod 6012, the other end of the bidirectional threaded rod 6012 is rotationally connected with the workbench 1, the middle position of the bidirectional threaded rod 6012 penetrates through the workbench 1 and is rotationally connected with the workbench 1, and the two sliding blocks 6013 are arranged on the two sides of the detection seat 2 and are sleeved on the bidirectional threaded rod 6012 and are threadedly connected with the bidirectional threaded rod 6012. The fourth driving unit 602 comprises a fifth driving piece 6021, a third fixed block 6022 and a supporting rod 6023. The fifth driving piece 6021 is connected with the sliding block 6013, a driving end of the fifth driving piece 6021 is connected with the third fixed block 6022, one end of the supporting rod 6023 is connected with the third fixed block 6022, and the other end of the supporting rod 6023 is hingedly connected with the side of the outer diameter detection block 501 away from the differential housing. Therefore, the two outer diameter detection mechanisms 5 can simultaneously detect the outer diameters of the positions on the two sides of the differential housing, so as to improve the detection efficiency of the outer diameter of the differential housing.

[0048] For example, the fourth driving piece 6011 is a motor, and the fifth driving piece 6021 is a pneumatic cylinder.

[0049] In the embodiment, the side of the detection seat 2 away from the workbench 1 is provided with a limiting groove 201, and a rotating piece (not shown in the figure) is embedded in the detection seat 2 to rotationally connect the detection seat 2 with the workbench 1. Therefore, the differential housing to be detected can be fixed by the limiting groove 201, so as to ensure that the differential housing does not move relative to the detection seat 2.

[0050] For example, the rotating piece is a component capable of rotating the detection seat 2, such as a motor or a rotary pneumatic cylinder.

[0051] Need to explain is: because the first drive assembly 4 can drive the inner diameter detection mechanism 3 along the Z axis direction moves along the axis of the first drive assembly 4 rotates, and under the cooperation of the rotating part, so that the inner diameter detection mechanism 3 can reach each position of the differential housing inner wall, in this way, the differential housing each position inner diameter detection can be realized;Because the second drive assembly 6 drives the outer diameter detection mechanism 5 along the Y axis direction and Z axis direction moves, and under the cooperation of the rotating part, so that the outer diameter detection mechanism 5 can reach each position of the differential housing outer wall, in this way, the differential housing each position outer diameter detection can be realized.

[0052] The detection process of the differential housing inner diameter, outer diameter and thickness of the utility model is: first, the differential housing to be detected is placed on the detection seat 2;Then, the first drive assembly 4 is used to make the inner diameter detection block 301 fit with the inner wall of the differential housing, and the second drive assembly 6 is used to make the outer diameter detection block 501 fit with the outer wall of the differential housing;Finally, the first distance sensor 302 detects the distance R1 from the inner diameter detection block 301 to the center of the two mounting shaft holes of the differential housing (i.e. the inner diameter of the differential housing at this position), and the second distance sensor 502 detects the distance R2 from the outer diameter detection block 501 to the center of the two mounting shaft holes of the differential housing (i.e. the outer diameter of the differential housing at this position), then the thickness H of the differential housing at this position is R2-R1, and then the first drive assembly 4, the second drive assembly 6 and the rotating part are cooperated to move the inner diameter detection block 301 and the outer diameter detection block 501 to each position of the differential housing to obtain a plurality of inner and outer diameter data, so as to realize the detection of the inner diameter, the outer diameter and the thickness of each position of the differential housing.

[0053] In summary, the utility model drives the inner diameter detection mechanism 3 along the Z axis direction moves along the axis of the first drive assembly 4 rotates through the first drive assembly 4 to realize the differential housing each position inner diameter detection, drives the outer diameter detection mechanism 5 along the Y axis direction and Z axis direction moves through the second drive assembly 6 to realize the differential housing each position outer diameter detection, and obtains the thickness of the differential housing through the inner diameter and the outer diameter of the differential housing, compared with the prior art single inner diameter detection mode, the mode is simple in structure, convenient to operate, can realize the differential housing each position inner diameter, outer diameter and thickness detection, to improve its detection efficiency, and improve the practicability of the whole detection device.

[0054] The above description is an explanation of the utility model, not a limitation of the utility model, the scope defined by the utility model is referred to the claims, within the protection scope of the utility model, any form of modification can be made.

Claims

1. An electric vehicle differential housing inspection apparatus, characterized by, The utility model relates to a differential housing inner and outer diameter detection device, which comprises: a workbench (1), and a detection seat (2) mounted on the upper surface of the workbench (1) and used for fixing a differential housing; an inner diameter detection mechanism (3) mounted on the detection seat (2) through a first driving assembly (4), the first driving assembly (4) being used for driving the inner diameter detection mechanism (3) to move along the Z-axis direction and rotate along the axis of the first driving assembly (4) to realize detection of the inner diameter of the differential housing at different positions; an outer diameter detection mechanism (5) mounted on the workbench (1) through a second driving assembly (6), the second driving assembly (6) being used for driving the outer diameter detection mechanism (5) to move along the Y-axis direction and the Z-axis direction to realize detection of the outer diameter of the differential housing at different positions.

2. The electric vehicle differential case detection apparatus of claim 1, wherein: The inner diameter detection mechanism (3) comprises: an inner diameter detection block (301) and a first distance sensor (302), the inner diameter detection block (301) being connected to the driving end of the first driving assembly (4) on the side away from the differential housing, the side of the inner diameter detection block (301) close to the differential housing being arc-shaped, and the first distance sensor (302) being embedded on the side of the inner diameter detection block (301) close to the differential housing.

3. The electric vehicle differential case detection apparatus of claim 2, wherein: The first driving assembly (4) comprises: a first driving unit (401) and a second driving unit (402), the first driving unit (401) being connected to the detection seat (2), the driving end of the first driving unit (401) being connected to the second driving unit (402), and the driving end of the second driving unit (402) being connected to the side of the inner diameter detection block (301) away from the differential housing; the first driving unit (401) being used for driving the inner diameter detection block (301) to move along the Z-axis direction, and the second driving unit (402) being used for driving the inner diameter detection block (301) to rotate along the axis of the second driving unit (402).

4. The electric vehicle differential case detection apparatus of claim 1, wherein: The outer diameter detection mechanism (5) comprises: an outer diameter detection block (501) and a second distance sensor (502), the outer diameter detection block (501) being hingedly connected to the driving end of the second driving assembly (6) on the side away from the differential housing, the side of the outer diameter detection block (501) close to the differential housing being a circular arc surface, and the second distance sensor (502) being embedded on the side of the outer diameter detection block (501) close to the differential housing.

5. The electric vehicle differential housing inspection apparatus of claim 4, wherein: The second driving assembly (6) comprises: a third driving unit (601) and a fourth driving unit (602), the third driving unit (601) being connected to the workbench (1), the driving end of the third driving unit (601) being connected to the fourth driving unit (602), and the driving end of the fourth driving unit (602) being hingedly connected to the side of the outer diameter detection block (501) away from the differential housing.

6. The electric vehicle differential case detection apparatus of claim 1, wherein: The detection seat (2) is provided with a limiting groove (201) on the side away from the workbench (1); The detection seat (2) is embedded with a rotating member, and the rotating member is used to realize the rotating connection between the detection seat (2) and the workbench (1).

7. The electric vehicle differential case detection apparatus of claim 3, wherein: The inner diameter detection mechanism (3) is provided with two, and the two inner diameter detection mechanisms (3) are oppositely arranged. The second driving unit (402) corresponds to the inner diameter detection mechanism (3) one by one.

8. The electric vehicle differential case detection apparatus of claim 3, wherein: The first driving unit (401) comprises: A first driving member (4011) and a first fixed block (4012), the first driving member (4011) is connected with the detection seat (2), and the driving end of the first driving member (4011) is connected with the first fixed block (4012); The second driving unit (402) comprises: A second driving member (4021), a rotating rod (4022), a second fixed block (4023) and a third driving member (4024), the second driving member (4021) is connected with the first fixed block (4012), the driving end of the second driving member (4021) is connected with one end of the rotating rod (4022), the other end of the rotating rod (4022) is rotatably connected with the first fixed block (4012), the second fixed block (4023) is sleeved on the rotating rod (4022) and is fixedly connected with the second fixed block (4023), the third driving member (4024) is connected with the second fixed block (4023), and the driving end of the third driving member (4024) is connected with the side away from the differential housing of the inner diameter detection block (301).

9. The electric vehicle differential case detection apparatus of claim 5, wherein: The outer diameter detection mechanism (5) is provided with two, and the two outer diameter detection mechanisms (5) are respectively located on the two sides of the detection seat (2), and the two outer diameter detection mechanisms (5) are oppositely arranged. The fourth driving unit (602) corresponds to the outer diameter detection mechanism (5) one by one.

10. The electric vehicle differential housing inspection apparatus of claim 5, wherein: The third driving unit (601) comprises: A fourth driving member (6011), a bidirectional threaded rod (6012) and two sliding blocks (6013), the fourth driving member (6011) is connected with the workbench (1), the driving end of the fourth driving member (6011) is connected with one end of the bidirectional threaded rod (6012), the other end of the bidirectional threaded rod (6012) is rotatably connected with the workbench (1), the middle position of the bidirectional threaded rod (6012) penetrates through the workbench (1) and is rotatably connected with the workbench (1), the two sliding blocks (6013) are respectively located on the two sides of the detection seat (2), and the sliding blocks (6013) are sleeved on the bidirectional threaded rod (6012) and are threadedly connected with the bidirectional threaded rod (6012); The fourth driving unit (602) comprises: The fifth driving member (6021) is connected with the sliding block (6013), the driving end of the fifth driving member (6021) is connected with the third fixed block (6022), one end of the supporting rod (6023) is connected with the third fixed block (6022), and the other end of the supporting rod (6023) is hingedly connected with the side, away from the differential case, of the outer diameter detection block (501).

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