Automobile differential housing rapid detection device and detection method

Abstract

The application relates to the field of differential housing detection, and discloses a quick detection device and detection method for an automobile differential housing, which comprises a cabinet body, a fixing table is arranged in the cabinet body, a plurality of limiting pins are arranged on the fixing table, a lifting opening is arranged on the fixing table, two lifting rods are oppositely arranged above and below the fixing table, a hemispherical measuring cavity is arranged at the opposite ends of the two lifting rods, semicircular through openings are arranged on the two sides of the lifting rods, the through openings are communicated with the measuring cavity, the through openings penetrate through the end portions of the lifting rods, a telescopic rod is horizontally arranged on one side of the fixing table, a telescopic cylinder is arranged on the telescopic rod, a detection rod is arranged at the end of the telescopic rod close to the fixing table, a laser probe is arranged at the end portion of the detection rod, a distance sensor is arranged on the telescopic rod, the laser probe is electrically connected with the distance sensor, and a rotating motor is further arranged on the telescopic rod.

Description

Technical Field

[0001] This invention relates to the field of differential housing testing technology, and particularly to a rapid testing device and method for automotive differential housings. Background Technology

[0002] A car differential is a mechanism that allows the left and right (or front and rear) drive wheels to rotate at different speeds. It mainly consists of left and right half-shaft gears, two planetary gears, and a gear carrier. In four-wheel drive, all four wheels must be connected to drive them. If the four wheels were mechanically connected, the car would not rotate at the same speed when driving on curves. Therefore, a center differential is needed to adjust the speed difference between the front and rear wheels. A typical differential consists of planetary gears, a planetary gear carrier (differential housing), and half-shaft gears. Engine power enters the differential via the driveshaft, directly driving the planetary gear carrier, which in turn drives the left and right half-shafts, driving the left and right wheels respectively. As a core component of the transmission system, the differential housing's performance directly affects vehicle safety and reliability. Professional testing of the differential housing covers key indicators such as dimensional accuracy, material mechanical properties, surface defects, and sealing performance.

[0003] As attached Figure 1 The standard differential housing shown has gear shaft holes at both ends and slotted shaft holes at the top and bottom. Inside is a mounting cavity housing the left and right half-shaft gears and two planetary gears for transmission. The axes of the half-shaft gears should be perpendicular to the axes of the planetary gears. Ideally, the axis of the gear shaft holes should intersect and be perpendicular to the midpoint of the axis of the slotted shaft hole. In actual production, because the gear shaft holes are machined with one end as a reference, the axes of the two gear shaft holes are collinear. Similarly, the slotted shaft hole is machined with one end of the gear shaft hole as a reference, so its axis is also perpendicular to the axis of the gear shaft hole. However, due to the rapid wear of the tool shims, the axes of the gear shaft holes and the slotted shaft holes can easily shift, meaning they are perpendicular but not intersecting. If the offset tolerance is large, it can cause the planetary gears to rotate poorly, affecting the operation of the differential.

[0004] Meanwhile, an arc-shaped groove is machined on the inner wall of the slotted shaft bore to ensure sufficient allowance for planetary gear installation. The slotted shaft bore is drilled from the outside in, while the arc-shaped groove is milled on the inner wall of the housing using a gooseneck milling cutter; they are not machined simultaneously. If the arc-shaped groove and the slotted shaft bore are not coaxial, it can easily cause the planetary gears to misalign, affecting the differential's operation. Therefore, the offset between the axis of the gear shaft bore and the axis of the slotted shaft bore, as well as the coaxiality of the arc-shaped groove, both need to be checked.

[0005] The above-mentioned indicators are typically tested using a coordinate measuring machine (CMM). However, CMMs require manual adjustment of the inspection records one by one, resulting in low inspection efficiency. They are only suitable for inspecting the first product after a tool change or shift change, and cannot quickly inspect each product on the production line. Therefore, a device is needed that can quickly inspect the above-mentioned parameters. Summary of the Invention

[0006] The purpose of this invention is to provide a rapid testing device and method for automotive differential housings, aiming to solve the problems of axial offset and coaxiality of arc-shaped grooves in the prior art.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A rapid testing device for automotive differential housing, comprising a cabinet, a fixed platform provided inside the cabinet, a plurality of limit pins provided on the fixed platform, a lifting port provided on the fixed platform, two lifting rods arranged opposite each other above and below the fixed platform, a hemispherical measuring cavity provided at one end of the two lifting rods opposite each other, the lifting rods and the measuring cavity being coaxial with the gear shaft hole of the differential housing, semi-circular through-holes provided on both sides of the lifting rods, the through-holes communicating with the measuring cavity and penetrating the end of the lifting rods, a telescopic rod horizontally provided on one side of the fixed platform, a telescopic cylinder provided on the telescopic rod, a detection rod provided at one end of the telescopic rod near the fixed platform, a laser probe provided at the end of the detection rod, a distance sensor provided on one side of the telescopic cylinder, the laser probe being electrically connected to the distance sensor, and a rotary motor provided on the telescopic rod.

[0008] Optionally, four laser probes are provided, and the four laser probes are evenly distributed on the outer wall of the end of the detection rod.

[0009] Optionally, the inner diameter of the passage is larger than the outer diameter of the telescopic rod, and the outer diameter of the telescopic rod is larger than the outer diameter of the detection rod.

[0010] Optionally, a slide rail is provided below the fixed platform, and a slider that cooperates with the slide rail is provided at the bottom of the fixed platform. An adjusting screw is also horizontally provided below the fixed platform, and an adjusting motor is provided at one end of the adjusting screw. A threaded hole that cooperates with the adjusting screw is provided on the slider.

[0011] Optionally, the lifting port is circular, and multiple mounting holes are provided around the periphery of the lifting port, with the limiting pin threadedly connected to the mounting holes.

[0012] Optionally, an alarm is installed on top of the cabinet.

[0013] A rapid inspection method for automotive differential housings includes the following steps:

[0014] S1. Place the differential housing on the fixed platform, insert the limit pin into the flange hole on the differential housing, and then control the two lifting rods to be inserted into the differential housing from the gear hole of the differential housing to dock inside the differential housing. The two measuring chambers form a spherical cavity, and the two through holes form a circular hole.

[0015] S2. Control either of the two telescopic rods to rotate while moving towards the differential housing. The detection rod is inserted into the slotted shaft hole and continues to move forward. When the laser probe enters the slotted shaft hole, the laser probe detects the inner diameter of the slotted shaft hole. At this time, the forward distance of the laser probe is marked as A. When the laser probe detects a sudden increase in the inner diameter, the laser probe detects the radius of the arc-shaped groove of the differential housing. The maximum and minimum values ​​detected by the laser probe at the instant are the deviation distance between the axis of the arc-shaped groove and the axis of the slotted shaft hole, which is half of the maximum and minimum values.

[0016] S3. The probe continues to move forward, passing through the through-hole into the measuring cavity. The laser probe detects the radius of the measuring cavity. The probe continues to move forward, passing through another through-hole, and detects the inner diameter of the arc-shaped groove on the other side of the differential housing. When the laser probe detects that the inner diameter suddenly decreases, the laser probe has entered the slotted shaft hole on the other side. The laser probe continues to move forward, and when it exits the slotted shaft hole, the forward distance B is recorded.

[0017] S4, the laser probe movement distance is When the laser probe moves to the center of the axis of the two slotted shaft holes, the detected radius is φ. The radius of the measuring cavity is fixed at D. Therefore, the offset distance between the axis of the gear shaft hole and the axis of the slotted shaft hole can be calculated. The UZ value is used to determine whether the differential housing is qualified.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention utilizes a lifting rod and a measuring cavity. The lifting rod is inserted into the differential housing from both the upper and lower ends, forming a spherical cavity between the measuring cavities. A probe rod is then horizontally inserted into the housing. The probe rod's laser probe and distance sensor work together to detect the arc-shaped grooves within the differential housing, determining the offset between the axis of the arc-shaped groove and the axis of the slotted shaft hole. By detecting the distance between two arc-shaped grooves, the midpoint of the slotted shaft hole's axis can be calculated. Then, by using the inner diameter value measured at the midpoint of the slotted shaft hole's axis and the inner diameter value of the measuring cavity, the offset between the gear shaft hole and the slotted shaft hole can be calculated. This allows for rapid inspection of the differential housing, making it suitable for batch inspection of products on a production line. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a standard differential housing component in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the external structure of an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of an embodiment of the present invention;

[0024] Figure 4 This is a cross-sectional structural schematic diagram of an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the lifting rod structure in one embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the telescopic rod and the detection rod in one embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the lifting motor and adjusting motor in one embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the offset distance calculation structure in one embodiment of the invention.

[0029] Attached Figure Descriptions: 1. Differential housing standard parts; 1a. Gear shaft hole; 1b. Slotted shaft hole; 1c. Flange hole; 1d. Arc-shaped groove; 2. Cabinet; 2a. Alarm; 3. Fixing platform; 3a. Lifting port; 3b. Mounting hole; 3c. Limit pin; 4. Lifting rod; 4a. Measuring chamber; 4b. Pass-through port; 5. Lifting motor; 6. Lifting block; 7. Lifting cylinder; 8. Telescopic cylinder; 9. Telescopic rod; 10. Detection rod; 11. Laser probe; 12. Distance sensor; 13. Rotary motor; 14. Slide rail; 15. Slider; 16. Adjusting screw; 17. Adjusting motor. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] The differential housing standard part 1 used in this invention is as follows: Figure 1 As shown, there is a gear shaft hole 1a at the top and bottom, a slotted shaft hole 1b on each side, and multiple flange holes 1c at the bottom. The axis of the gear shaft hole 1a of the standard part is perpendicular to and intersects the axis of the slotted shaft hole 1b at its center. The inner wall of the slotted shaft hole 1b is milled with an arc-shaped groove 1d, and the axis of the arc-shaped groove 1d of the standard part intersects with the axis of the slotted shaft hole 1b.

[0032] The rapid testing device for automotive differential housings provided by this invention, such as... Figure 2 As shown, it includes a cabinet 2, and an alarm 2a is installed on the top of the cabinet 2.

[0033] like Figure 3 and Figure 7 As shown, a fixed platform 3 is provided inside the cabinet 2. A lifting port 3a is located in the center of the fixed platform 3, and multiple mounting holes 3b are provided around the periphery of the lifting port 3a. At least two limiting pins 3c are also installed on the fixed platform 3. The limiting pins 3c are threadedly connected to the mounting holes 3b. To ensure that the limiting pins 3c can be smoothly inserted into the flange holes 1c, the upper end of the limiting pin 3c is designed as a frustum shape, smaller at the top and larger at the bottom, and the maximum outer diameter of the limiting pin 3c is equal to the inner diameter of the flange hole 1c. After the limiting pins 3c are inserted into the flange holes 1c, the differential housing will not move. To facilitate the installation of the differential housing, the lifting port 3a is designed as a circle, and the mounting holes 3b are arranged along the circumference. A typical differential housing has 6 or 8 flange holes 1c, and the number of mounting holes 3b can be set in multiples of 6 or 8.

[0034] like Figure 4 and Figure 5 As shown, two lifting rods 4 are arranged opposite each other above and below the fixed platform 3. Both lifting rods 4 are coaxial with the lifting port 3a. In this embodiment, the upper lifting rod 4 is driven by a lifting motor 5, which is equipped with a lifting screw. The upper lifting rod 4 is equipped with a lifting block 6, which has a threaded hole that cooperates with the lifting screw. The lower lifting rod 4 is driven by a lifting cylinder 7. A measuring cavity 4a is opened at one end of the two lifting rods 4. The measuring cavity 4a is hemispherical. When the two lifting rods 4 are connected, a spherical cavity is formed between the two measuring cavities 4a. The spherical cavity is coaxial with the gear shaft hole 1a. Semicircular through ports 4b are also opened on both sides of the lifting rod 4. The through ports 4b communicate with the measuring cavities 4a and penetrate through the end of the lifting rod 4. After the two lifting rods 4 are connected, the corresponding through ports 4b can form a circular hole.

[0035] like Figure 6 As shown, a telescopic cylinder 8 is horizontally mounted on one side of the fixed platform 3. A telescopic rod 9 is horizontally mounted on the telescopic cylinder 8. A detection rod 10 is mounted on the end of the telescopic rod 9 near the fixed platform 3. Four laser probes 11 are evenly distributed on the outer wall of the end of the detection rod 10. A distance sensor 12 is mounted on one side of the telescopic cylinder 8. The laser probes 11 and the distance sensor 12 are electrically connected and work together to detect the inner diameter. A rotary motor 13 is also mounted on the telescopic rod 9. The rotary motor 13 can control the rotation of the detection rod 10, which facilitates the laser probes 11 to detect the inner diameter in multiple directions. The four laser probes 11 output four sets of data, and the average of the four sets of data is taken as the final detection data. To ensure that the detection rod 10 and the telescopic rod 9 can be smoothly inserted into the detection cavity, the inner diameter of the circular hole formed between the two through ports 4b should be greater than the outer diameter of the telescopic rod 9, and the outer diameter of the telescopic rod 9 of the detection rod 10 should be greater than or equal to the outer diameter of the detection rod 10.

[0036] like Figure 7 As shown, a slide rail 14 is provided below the fixed platform 3, and a slider 15 that cooperates with the slide rail 14 is provided at the bottom of the fixed platform 3. An adjusting screw 16 is also horizontally provided below the fixed platform 3, and an adjusting motor 17 is provided at one end of the adjusting screw 16. A threaded hole that cooperates with the adjusting screw 16 is provided on the slider 15. By making the fixed platform 3 movable, it is convenient for manual or robotic arms to place and grasp the differential housing workpiece.

[0037] like Figure 8 As shown, the detection rod 10 is coaxial with the slotted shaft hole 1b. If the axis of the gear shaft hole 1a and the axis of the slotted shaft hole 1b are only perpendicular but do not intersect, then when the laser probe 11 moves to the midpoint of the axis of the slotted shaft hole 1b, the measured inner radius φ of the spherical cavity is smaller than the actual inner radius D of the spherical cavity. The offset distance between the two axes can be calculated by formula.

[0038] The working principle of this embodiment is as follows:

[0039] First, place the differential housing standard part 1 on the fixed platform 3, ensuring that the gear shaft hole 1a is coaxial with the lifting hole. Then, install the limiting pin 3c, allowing it to be inserted into the flange hole 1c. Simultaneously, the outer diameter of the limiting pin 3c should be equal to the inner diameter of the flange hole 1c, preventing any wobbling after the differential housing standard part 1 is placed. Next, connect the two lifting rods 4. This will form a circular hole between the two through-holes 4b. This circular hole should be coaxial with the slotted shaft hole 1b. If not, adjust the position of the differential housing standard part 1 vertically by adding shims, ensuring the circular hole is coaxial with the slotted shaft hole 1b, and that the gear shaft hole 1a is coaxial with the lifting port 3a and the lifting rod 4. After adjusting the position, remove the standard part.

[0040] The differential housing is placed on the fixed platform 3, and the limiting pin 3c is inserted into the flange hole 1c to fix and limit the test part. The lifting motor 5 and the lifting cylinder 7 control the relative movement of the two lifting rods 4 to complete the docking inside the test part. At this time, a spherical cavity is formed between the two measuring chambers 4a, and a circular hole is formed between the two through ports 4b. Then, the telescopic cylinder 8 controls the telescopic rod 9 and the detection rod 10 to extend to one side of the test part. The detection rod 10 and the laser probe 11 extend into the slotted shaft hole 1b of the test part. At this time, the extension distance of the telescopic rod 9 is marked as A, and it slowly moves forward. At this time, the laser probe 11 detects the slotted shaft hole 1b inside the test part. The diameter changes very little, and the degree of change depends on the roughness of the inner wall of the slotted shaft hole 1b. The detection rod 10 continues to advance. When a sudden increase in the inner diameter is detected, it proves that the laser probe 11 has entered the arc-shaped groove 1d. Then the laser probe 11 detects the arc-shaped groove 1d and measures the distance from the laser probe 11 to the inner wall of the arc-shaped groove 1d. The maximum and minimum values ​​of the telescopic rod 9 at the same position are recorded. If the arc-shaped groove 1d and the slotted shaft hole 1b are coaxial, then the maximum and minimum values ​​should be equal. If there is a difference, the offset of the axis of the arc-shaped groove 1d from the axis of the slotted shaft hole 1b is half of the difference between the maximum and minimum values.

[0041] After the inspection of the arc-shaped groove 1d is completed, the inspection rod 10 and the laser probe 11 continue to advance. After entering the through-hole 4b, the inner diameter detected by the laser probe 11 will become significantly smaller. Then, the laser probe 11 enters the circular cavity, and the inner diameter detected by the laser probe 11 will gradually increase, reach its maximum value, and then gradually decrease. Subsequently, the telescopic rod 9, the inspection rod 10, and the laser probe 11 advance further and enter the arc-shaped groove 1d on the other side. Then, the laser probe 11 detects the offset between the axis of the arc-shaped groove 1d on the other side and the axis of the slotted shaft hole 1b. When a sudden decrease in the inner diameter is detected, it proves that the laser probe 11 has entered the slotted shaft hole 1b on the other side. After the laser probe 11 continues to advance and passes through the slotted shaft hole 1b on the other side, the extension distance of the telescopic rod 9 is recorded as B. Then, the center of the axis of the slotted shaft hole 1b is the point where the extension distance of the telescopic rod 9 is B. The recorded inner radius of the spherical cavity is φ, while the inner radius of the spherical cavity is fixed at D. If the axis of the gear shaft hole 1a is offset from the axis of the slotted shaft hole 1b, the offset distance UZ can be determined by the formula... Calculated.

[0042] A rapid testing method for automotive differential housings, characterized by comprising the following steps:

[0043] S1. Place the differential housing on the fixed platform 3, insert the limit pin 3c into the flange hole 1c on the differential housing, and then control the two lifting rods 4 to be inserted into the differential housing from the gear hole of the differential housing and dock inside the differential housing. The two measuring chambers 4a form a spherical cavity, and the two through ports 4b form a circular hole.

[0044] S2. Control either of the two telescopic rods 9 to rotate while moving towards the differential housing. The detection rod 10 is inserted into the slotted shaft hole 1b and then continues forward. When the laser probe 11 enters the slotted shaft hole 1b, the laser probe 11 detects the inner diameter of the slotted shaft hole 1b. At this time, the forward distance of the laser probe 11 is marked as A. When the laser probe 11 detects a sudden increase in the inner diameter, the laser probe 11 detects the radius of the arc-shaped groove of the differential housing. The maximum and minimum values ​​detected by the laser probe 11 at the instant are the deviation distance between the axis of the arc-shaped groove and the axis of the slotted shaft hole 1b, which is half of the maximum and minimum values.

[0045] S3. The probe rod continues to move forward, passing through the through-hole 4b and entering the measuring cavity 4a. The laser probe 11 detects the radius of the measuring cavity 4a. The probe rod continues to move forward, passing through another through-hole 4b, and detects the inner diameter of the arc-shaped groove on the other side of the differential housing. When the laser probe 11 detects that the inner diameter suddenly decreases, the laser probe 11 has entered the slotted shaft hole 1b on the other side. The laser probe 11 continues to move forward, and when it exits the slotted shaft hole 1b, the forward distance B is recorded.

[0046] S4, the movement distance of laser probe 11 is When the laser probe 11 moves to the center of the axis of the two slotted shaft holes 1b, the detected radius is φ. The radius of the measuring cavity 4a is fixed at D. Then, the offset distance between the axis of the gear shaft hole 1a and the axis of the slotted shaft hole 1b can be calculated. The UZ value is used to determine whether the differential housing is up to standard. When a defect is detected, an alarm is triggered via an electrical signal to prompt personnel to conduct a re-inspection or scrap the device.

[0047] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0048] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A device for rapid detection of an automobile differential housing, characterized in that: The system includes a cabinet (2), inside which is a fixed platform (3). The fixed platform (3) has multiple limiting pins (3c) and a lifting port (3a). Two lifting rods (4) are positioned opposite each other above and below the fixed platform (3). A hemispherical measuring cavity (4a) is formed at one end of each lifting rod (4). Semicircular passage openings (4b) are formed on both sides of each lifting rod (4), communicating with the measuring cavity (4a) and penetrating the end of the lifting rod (4). One side of the fixed platform (3)... A telescopic rod (9) is horizontally arranged, and a telescopic cylinder (8) is arranged on the telescopic rod (9). A detection rod (10) is arranged at one end of the telescopic rod (9) near the fixed platform (3). The detection rod (10) and the one-axis hole (1b) are coaxial. A laser probe (11) is arranged on the outer wall of the end of the detection rod (10). A distance sensor (12) is arranged on one side of the telescopic cylinder (8). The laser probe (11) is electrically connected to the distance sensor (12). A rotary motor (13) is also arranged on the telescopic rod (9). The rotary motor (13) can control the rotation of the detection rod (10). When the two lifting rods (4) are connected, a spherical cavity is formed between the two measuring chambers (4a). The spherical cavity is coaxial with the gear shaft hole (1a). Semi-circular through-holes (4b) are also provided on both sides of the lifting rod (4). The through-holes (4b) are connected to the measuring chamber (4a) and pass through the end of the lifting rod (4). After the two lifting rods (4) are connected, the corresponding through-holes (4b) form a circular hole.

2. The automobile differential housing rapid detection device according to claim 1, characterized in that: Four laser probes (11) are provided, and the four laser probes (11) are evenly distributed on the outer wall of the end of the detection rod (10).

3. The rapid testing device for automotive differential housing according to claim 1, characterized in that: The inner diameter of the through-hole (4b) is greater than the outer diameter of the telescopic rod (9), and the outer diameter of the telescopic rod (9) is greater than or equal to the outer diameter of the detection rod (10).

4. The rapid testing device for automotive differential housing according to claim 1, characterized in that: A slide rail (14) is provided below the fixed platform (3), and a slider (15) that cooperates with the slide rail (14) is provided at the bottom of the fixed platform (3). An adjusting screw (16) is also horizontally provided below the fixed platform (3). An adjusting motor (17) is provided at one end of the adjusting screw (16), and a threaded hole that cooperates with the adjusting screw (16) is provided on the slider (15).

5. The rapid testing device for automotive differential housing according to claim 1, characterized in that: The lifting port (3a) is circular, and multiple mounting holes (3b) are provided around the periphery of the lifting port (3a). The limiting pin (3c) is threadedly connected to the mounting holes (3b).

6. The rapid testing device for automotive differential housing according to claim 1, characterized in that: An alarm (2a) is installed above the cabinet (2).

7. A method for rapid testing of an automotive differential housing using the rapid testing device for automotive differential housing as described in claim 1, characterized in that, Includes the following steps: S1. Place the differential housing on the fixed platform (3), insert the limiting pin (3c) into the flange hole (1c) on the differential housing, and then control the two lifting rods (4) to be inserted into the differential housing from the gear shaft hole (1a) of the differential housing to dock inside the differential housing. A spherical cavity is formed in the two measuring chambers (4a), and a circular hole is formed in the two through holes (4b). S2. Control either of the two telescopic rods (9) to rotate while moving towards the differential housing. Insert the detection rod (10) into the slotted shaft hole (1b) and continue forward. When the laser probe (11) enters the slotted shaft hole (1b), the laser probe (11) detects the inner diameter of the slotted shaft hole (1b). At this time, mark the forward distance of the laser probe (11) as A. When the laser probe (11) detects a sudden increase in the inner diameter, the laser probe (11) detects the radius of the arc-shaped groove of the differential housing. The maximum and minimum values ​​detected by the laser probe (11) at the instant are the deviation distance between the axis of the arc-shaped groove and the axis of the slotted shaft hole (1b), which is half of the difference between the maximum and minimum values. S3. The detection rod (10) continues to move forward, passes through the through-hole (4b) and enters the measuring cavity (4a). The laser probe (11) detects the radius of the measuring cavity (4a). The detection rod (10) continues to move forward, passes through another through-hole (4b), and detects the inner diameter of the arc-shaped groove on the other side of the differential housing. When the laser probe (11) detects that the inner diameter suddenly decreases, the laser probe (11) has entered the slotted shaft hole (1b) on the other side. The laser probe (11) continues to move forward and records the forward distance B when it exits the slotted shaft hole (1b). S4, the laser probe (11) moves at a distance of At this time, the laser probe (11) moves to the center of the axis of the two single-axis holes (1b), and the detected radius is If the radius of the measuring cavity (4a) is fixed at D, then the offset distance between the axis of the gear shaft hole (1a) and the axis of the slotted shaft hole (1b) can be calculated. The UZ value is used to determine whether the differential housing is qualified.

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