A comprehensive inspection tool for front axle assembly

Abstract

This utility model relates to the field of automotive assembly and testing technology, and discloses a comprehensive inspection fixture for a front axle assembly. It includes a base, a support plate fixedly connected to the left side of the upper surface of the base, a front axle assembly assembly mounted above the support plate, a movable seat slidably connected to the right side of the upper surface of the base via a slide rail, a support plate fixedly connected above the movable seat, a test pin fixedly connected to the left side surface of the support plate, a fixed frame fixedly connected above the support plate, and an electric telescopic rod fixedly connected to the inner top surface of the fixed frame. In this utility model, through the cooperation of the fixed frame, electric telescopic rod, movable box, distance sensor, positioning box, and magnetic block, the no-go gauge can be limited, ensuring stable vertical placement and stable linear movement in the up-down direction, preventing deviation and ensuring accurate test results. Simultaneously, different specifications of no-go gauges can be quickly replaced according to different production precision requirements.

Description

Technical Field

[0001] This utility model relates to the field of automotive assembly and testing technology, and in particular to a comprehensive inspection tool for front axle assembly. Background Technology

[0002] The "front axle assembly" is a core component of the automotive chassis system. It is an integrated set of components at the front of the vehicle used to mount the front wheels, bear the weight of the front end, transmit power (in the case of four-wheel drive / front-wheel drive), provide steering, and mount the brakes. The front axle assembly involves pressing the bushing assembly into the mounting holes of the axle reducer housing. The flange of the bushing assembly has three bolt holes for connecting the bracket, and the bushing on the bracket is connected to the vehicle. If the angle of the bushing assembly is not correct, even a slight angle deviation will cause the vehicle to vibrate during operation, while a large angle deviation will prevent a batch of front axles from being assembled into the vehicle, resulting in the scrapping of the entire front axle assembly. Therefore, in order to ensure the accuracy and quality of the components, they are inspected using a fixture after the components are manufactured.

[0003] A search revealed Chinese Patent Publication No. CN222027615U, which discloses a comprehensive inspection tool for a front axle assembly. This tool includes a sliding support plate that drives a detection pin to detect the assembly angle of the sleeve assembly. This prevents incorrect sleeve angle pressing, thereby eliminating quality problems caused by mismatch between the front axle assembly bracket and the vehicle. A go / no-go gauge is used to detect the gap between the support plate and the sleeve assembly. If the go gauge passes and the no-go gauge stops, the length of the sleeve assembly after pressing is deemed qualified; otherwise, it is deemed not qualified.

[0004] However, in actual use, when using the aforementioned integrated inspection tool to inspect the length of the sleeve assembly after press-fitting with the no-go gauge, it is necessary to manually insert the no-go gauge into the gap between the support plate and the sleeve assembly. During this process, it is impossible to ensure that the no-go gauge remains vertically downward, and there is a risk of tilting. Even if the gap is within acceptable limits, there may be situations where the no-go gauge cannot be inserted, which will affect the inspection results. Therefore, a front axle assembly integrated inspection tool is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a comprehensive inspection tool for the front axle assembly, which aims to improve the existing technology where the insertion of the stop gauge relies on manual operation, which poses a risk of deviation that could affect the inspection structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a comprehensive inspection fixture for a front axle assembly, comprising a base, a support plate fixedly connected to the left side of the upper surface of the base, a front axle assembly assembly disposed above the support plate, a movable seat slidably connected to the right side of the upper surface of the base via a slide rail, a support plate fixedly connected above the movable seat, a detection pin fixedly connected to the left side surface of the support plate, a fixed frame fixedly connected to the top of the support plate, an electric telescopic rod fixedly connected to the top inner surface of the fixed frame, a movable box fixedly connected to the bottom end of the electric telescopic rod, a distance sensor fixedly connected to the top inner inner surface of the movable box, a positioning box slidably connected to the inside of the movable box, a magnetic block fixedly connected to the rear inner wall surface of the positioning box, a check gauge disposed on the front side of the magnetic block, and a placement box and a controller fixedly connected to the left and right sides of the upper surface of the base, respectively.

[0007] As a further description of the above technical solution:

[0008] The bottom opening of the movable box is smaller than the bottom opening of the positioning box.

[0009] As a further description of the above technical solution:

[0010] The left side surface of the magnetic block and the left side surface of the support plate are on the same horizontal plane.

[0011] As a further description of the above technical solution:

[0012] The front and rear surfaces of the no-go gauge are both in contact with the inner wall of the positioning box.

[0013] As a further description of the above technical solution:

[0014] The inner wall surface of the movable box is provided with a sliding groove, and a slider is fixedly connected to the outer side of the positioning box. The slider is slidably connected to the inside of the sliding groove.

[0015] As a further description of the above technical solution:

[0016] A mounting bracket is fixedly connected to the right side surface of the base, and an electric push rod is fixedly connected to the right inner wall surface of the mounting bracket. The movable end of the electric push rod is fixedly connected to the bottom of the movable seat.

[0017] As a further description of the above technical solution:

[0018] A pressure sensor is fixedly connected to the left end of the detection pin. The pressure sensor is cylindrical in shape and its diameter is the same as that of the detection pin.

[0019] As a further description of the above technical solution:

[0020] The controller is electrically connected to the electric telescopic rod, the electric push rod, the distance sensor, and the pressure sensor.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the fixed frame, electric telescopic rod, moving box, distance sensor, positioning box and magnetic block are used to limit the no-go gauge, so that the no-go gauge is placed stably and vertically, and moves in a stable vertical direction, avoiding deviation and ensuring accurate test results. At the same time, no-go gauges of different specifications can be quickly replaced according to different production precision requirements. The operation is simple and highly adaptable. The downward displacement of the no-go gauge can be monitored in real time and the gap can be automatically determined to be qualified, replacing manual visual inspection.

[0023] 2. In this utility model, the cooperation of the sliding groove and the slider ensures that the inner wall of the positioning box fits against both sides of the no-go gauge, completely eliminating the risk of tilting. The cooperation of the mounting bracket, electric push rod and pressure sensor can provide feedback when the detection pin cannot pass through the screw hole, avoiding misjudgment. The pressure sensor can detect pressure changes and provide feedback to the controller, immediately stopping the electric push rod to prevent the gauge from being damaged due to forced insertion and extend the service life of the gauge. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall front axle assembly integrated inspection fixture proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the base of a front axle assembly integrated inspection fixture proposed in this utility model;

[0026] Figure 3 This is a schematic cross-sectional view of the front part of the movable box of the integrated inspection tool for the front axle assembly proposed in this utility model.

[0027] Figure 4 This is a schematic diagram of the partial structure of the check gauge and magnetic block after the downward movement of the front axle assembly integrated inspection tool proposed in this utility model.

[0028] Figure 5 This is a schematic diagram of the disassembled movable box of the front axle assembly integrated inspection fixture proposed in this utility model.

[0029] Legend:

[0030] 1. Base; 2. Support plate; 3. Front axle assembly; 4. Moving seat; 5. Support plate; 6. Detection pin; 7. Fixing frame; 8. Electric telescopic rod; 9. Moving box; 10. Distance sensor; 11. Positioning box; 12. Magnetic block; 13. Go / no-go gauge; 14. Controller; 15. Placement box; 16. Slide groove; 17. Slider; 18. Mounting bracket; 19. Electric push rod; 20. Pressure sensor. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1-2 This utility model provides an embodiment of a front axle assembly inspection fixture, comprising a base 1, a support plate 2 fixedly connected to the left side of the upper surface of the base 1, a front axle assembly body 3 disposed above the support plate 2, a positioning post fixedly connected to the support plate 2, and a slot adapted to the positioning post on the bottom surface of the front axle assembly body 3. There are two or more positioning posts, which can be inserted into the slots to stably limit the position of the front axle assembly body 3. A screw hole is provided at the right end of the front axle assembly body 3. A movable seat 4 is slidably connected to the right side of the upper surface of the base 1 via a slide rail. The moving direction of the movable seat 4 is consistent with the axial direction of the right end of the front axle assembly body 3. The movable seat 4 can move linearly left and right above the base 1. A support plate 5 is fixedly connected to the upper surface of the movable seat 4, and a detection pin 6 is fixedly connected to the left side surface of the support plate 5. When the movable seat 4 moves, it can drive the support plate 5 and the detection pin 6 to move synchronously.

[0033] Reference Figures 3-5A fixed frame 7 is fixedly connected above the support plate 5. An electric telescopic rod 8 is fixedly connected to the top surface of the fixed frame 7. A movable box 9 is fixedly connected to the bottom end of the electric telescopic rod 8. When the electric telescopic rod 8 is running, it can drive the movable box 9 to move linearly up and down. A distance sensor 10 is fixedly connected to the top surface of the movable box 9. A positioning box 11 is slidably connected inside the movable box 9. The bottom opening size of the movable box 9 is smaller than the bottom size of the positioning box 11 to prevent the positioning box 11 from detaching and falling out of the movable box 9. The distance sensor 10 can monitor the distance between itself and the positioning box 11. A magnetic block 12 is fixedly connected to the rear inner wall surface of the positioning box 11. The left side surface of the magnetic block 12 is at the same level as the left side surface of the support plate 5. A stop gauge 13 is provided on the front side of the magnetic block 12 to prevent... The go gauge 13 is a plate-like structure with unequal thickness at both ends. The specific thickness values ​​of the two plates are determined according to the relevant assembly requirements. The no-go gauge 13 is made of iron material. When the magnetic block 12 and the no-go gauge 13 are attached, they can be magnetically attracted and limited. At the same time, the no-go gauge 13 can be quickly disassembled by pulling it down directly from the magnetic block 12. The front and rear surfaces of the no-go gauge 13 are attached to the inner wall of the positioning box 11. When the no-go gauge 13 is inserted into the positioning box 11 from the bottom and attached to the magnetic block 12, the inner wall of the positioning box 11 will limit the no-go gauge 13, so that the no-go gauge 13 is placed stably and vertically to avoid displacement. At the same time, it is used for the attachment between the no-go gauge 13 and the magnetic block 12, so that the right surface of the no-go gauge 13 is also attached to the left surface of the support plate 5.

[0034] Reference Figures 2-3The upper surface of the base 1 is fixedly connected to the left and right sides of the placement box 15 and the controller 14 respectively. The controller 14 has a built-in filtering algorithm (moving average filtering window of 0.5s) to avoid false triggering caused by mechanical vibration. The controller 14 is electrically connected to the electric telescopic rod 8, the electric push rod 19, the distance sensor 10 and the pressure sensor 20. The interior of the placement box 15 is divided into several placement chambers by partitions for placing different specifications of go gauges 13. The controller 14 can control the electrical components set on the inspection tool. After the front axle assembly 3 is placed on the support plate 2 and positioned, the moving seat 4 can be pushed to the left to observe whether the detection pin 6 can be smoothly inserted into the screw hole at the right end of the front axle assembly 3. If not, the front axle assembly 3 is deemed unqualified. If it can, the moving seat 4 is moved to the left to the pre-positioned position. Set the position, then start the electric telescopic rod 8 to drive the moving box 9 to move down. At this time, the no-go gauge 13 can follow the moving box 9 down and be inserted into the gap between the support plate 5 and the right end of the front axle assembly 3. If the front axle assembly 3 is qualified, if the go gauge (thinner end) of the no-go gauge 13 can pass through and the no-go gauge (thicker end) can stop, then the length of the front axle assembly 3 after pressing is qualified. The bottom surface of the magnetic block 12 is higher than the bottom surface of the no-go gauge. If the distance sensor 10 detects the no-go gauge 13 moving up before reaching the preset position (the position where the go gauge of the no-go gauge 13 is fully inserted into the gap in the qualified state), it means that the front axle assembly 3 is unqualified. If the distance sensor 10 does not detect the no-go gauge 13 moving up after reaching the preset position (the position where the no-go gauge 13 is limited and cannot move down in the qualified state), the front axle assembly 3 is also unqualified.

[0035] The preset position of the distance sensor 10 needs to be determined based on the length of the no-go gauge 13 and the insertion depth of the no-go gauge 13 into the gap when the length of the front axle assembly 3 is qualified after pressing. Assuming the length of the no-go gauge 13 is L3, the insertion depth of the no-go gauge 13 into the gap when the length of the front axle assembly 3 is qualified after pressing is L4 (this depth can be determined based on assembly requirements and actual testing experience, for example, by testing a large number of qualified front axle assemblies, the average insertion depth of the no-go gauge 13 is statistically obtained as L4). The distance sensor 10 is installed on the top surface inside the moving box 9, and its preset position is to move downward from the initial position of the moving box 9. When installing distance sensor 10 at the distance L3-L4, ensure that its detection direction is vertically downward and that its detection range covers the movement range of go gauge 13 during normal detection. Before each use, distance sensor 10 can be calibrated using a simulated gap block of standard thickness. Compare the detection value of distance sensor 10 with the actual thickness of the simulated gap block. If the error between the detection value and the actual thickness is within the allowable range (e.g., ±Emm), distance sensor 10 is considered calibrated and can be used normally. If the error exceeds the range, distance sensor 10 needs to be adjusted or replaced.

[0036] Reference Figures 1-3 The inner wall surface of the movable box 9 is provided with a sliding groove 16, and the outer side of the positioning box 11 is fixedly connected with a slider 17. The slider 17 is slidably connected to the inside of the sliding groove 16. Through the cooperation of the slider 17 and the sliding groove 16, the movement of the positioning box 11 can be further guided and limited, so that the positioning box 11 can only move in a straight line in the up and down direction to avoid deviation. At the same time, the upper surface of the sliding groove 16 is lower than the bottom surface of the distance sensor 10, which can further limit the movement of the positioning box 11 and prevent the positioning box 11 from moving upward too much and causing damage to the distance sensor 10.

[0037] A mounting bracket 18 is fixedly connected to the right side surface of the base 1. An electric push rod 19 is fixedly connected to the inner right side surface of the mounting bracket 18. The movable end of the electric push rod 19 is fixedly connected to the bottom of the movable seat 4. When the electric push rod 19 is running, it can drive the movable seat 4 to move linearly in the left and right directions. At the same time, it can automatically stop after the movable seat 4 moves to a preset position without manual limit, thus avoiding deviation. A pressure sensor 20 is fixedly connected to the left end of the detection pin 6. The pressure sensor 20 is cylindrical in shape, and its diameter is the same as that of the detection pin 6. When the front axle assembly 3 is qualified, the detection pin 6 passes directly through the screw hole, and the pressure sensor 20 follows suit and passes directly through. If the front axle assembly 3 is unqualified, the detection pin 6 cannot pass through the screw hole, and the pressure sensor 20 will directly detect the pressure change. At this time, the pressure sensor 20 will send a signal to the controller 14 to immediately stop the electric push rod 19 and avoid damage to the inspection tool.

[0038] Working principle: The front axle assembly 3 is placed on the support plate 2 and fixed by the positioning pin and slot to ensure its precise position. A check gauge 13 that is compatible with the production precision requirements of the front axle assembly 3 is selected and taken out of the placement box 15. It is then inserted into the positioning box 11 and abuts against the magnetic block 12. Next, the electric push rod 19 is activated to push the moving seat 4 to the left along the slide rail, which drives the detection pin 6 to insert into the screw hole at the right end of the front axle. The pressure sensor 20 monitors the resistance in real time. If the resistance is normal, the detection pin 6 can pass through smoothly and proceed to the next step. If the resistance is abnormal, the pressure sensor 20 will transmit a signal to the controller 14 to stop the machine immediately and determine that the assembly angle is not qualified.

[0039] After the detection pin 6 passes the inspection, the electric push rod 19 is activated, pushing the movable seat 4 to the preset position. Then, the electric telescopic rod 8 is activated, pushing the movable box 9 to move down. The no-go gauge 13, which is magnetically attracted in the positioning box 11, moves down vertically in sync and is inserted into the gap between the support plate 5 and the right end of the front axle. The distance sensor 10 monitors the displacement of the no-go gauge 13 in real time.

[0040] Qualified scenarios:

[0041] The go gauge (thin end) is fully inserted into the gap → the distance sensor 10 detects that the displacement meets the standard;

[0042] The stop gauge (thick end) is blocked by the gap → the positioning box 11 moves upward and triggers the distance sensor 10 to give a feedback signal.

[0043] Unacceptable scenarios:

[0044] 1) The go gauge cannot be inserted → the positioning box 11 moved upwards prematurely, and the displacement did not meet the standard;

[0045] 2) The stop gauge can be inserted → the positioning box 11 did not move upward, and the displacement exceeded the limit.

[0046] The controller (14) automatically determines based on the data fed back by the distance sensor 10:

[0047] If the go gauge position meets the standard and the no-go gauge position is obstructed, the press-fit length is qualified.

[0048] If any condition is not met, the application is deemed unqualified and an alarm is triggered.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A front axle assembly comprehensive testing fixture, comprising a base (1), characterized in that: A support plate (2) is fixedly connected to the left side of the upper surface of the base (1). A front axle assembly (3) is provided above the support plate (2). A movable seat (4) is slidably connected to the right side of the upper surface of the base (1) via a slide rail. A support plate (5) is fixedly connected to the top of the movable seat (4). A detection pin (6) is fixedly connected to the left side of the support plate (5). A fixed frame (7) is fixedly connected to the top of the support plate (5). An electric telescopic rod (8) is fixedly connected to the top of the fixed frame (7). A movable box (9) is fixedly connected to the bottom of the electric telescopic rod (8). A distance sensor (10) is fixedly connected to the top of the movable box (9). A positioning box (11) is slidably connected to the inside of the movable box (9). A magnetic block (12) is fixedly connected to the inner rear wall surface of the positioning box (11). A go gauge (13) is provided on the front side of the magnetic block (12). A placement box (15) and a controller (14) are fixedly connected to the left and right sides of the upper surface of the base (1), respectively.

2. A front axle assembly comprehensive testing fixture according to claim 1, characterized in that: The bottom opening size of the movable box (9) is smaller than the bottom size of the positioning box (11).

3. The front axle assembly comprehensive inspection fixture of claim 1, wherein: The left side surface of the magnetic block (12) and the left side surface of the support plate (5) are on the same horizontal plane.

4. The front axle assembly comprehensive inspection fixture of claim 1, wherein: The front and rear surfaces of the go-no-go gauge (13) are in contact with the inner wall of the positioning box (11).

5. The front axle assembly comprehensive inspection fixture of claim 1, wherein: The inner wall surface of the movable box (9) is provided with a sliding groove (16), and the outer side of the positioning box (11) is fixedly connected with a slider (17), which is slidably connected to the inside of the sliding groove (16).

6. A front axle assembly comprehensive testing fixture according to claim 1, characterized in that: A mounting bracket (18) is fixedly connected to the right side surface of the base (1), and an electric push rod (19) is fixedly connected to the right inner wall surface of the mounting bracket (18). The movable end of the electric push rod (19) is fixedly connected to the bottom of the movable seat (4).

7. A front axle assembly comprehensive testing fixture according to claim 6, characterized in that: A pressure sensor (20) is fixedly connected to the left end of the detection pin (6). The pressure sensor (20) is cylindrical in shape and its diameter is the same as that of the detection pin (6).

8. A front axle assembly comprehensive testing fixture according to claim 7, characterized in that: The controller (14) is electrically connected to the electric telescopic rod (8), the electric push rod (19), the distance sensor (10), and the pressure sensor (20).

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