Drive shaft assembly system and method

Abstract

The application discloses a driving shaft assembling system and method, wherein the driving shaft assembling system comprises a positioning jig, a middle part of which is provided with a through hole arranged along an up-down direction; a locking screw mechanism, which is provided with a locking screw head capable of rotating along an up-down axis, the locking screw head being located below the through hole, the locking screw head being capable of penetrating the through hole upward or withdrawing from the through hole downward; and a positioning mechanism, which is provided with a clamping jaw capable of rotating along the up-down axis and a pressing head capable of moving up and down, the clamping jaw being located above the positioning jig, the clamping jaw being formed with a clamping space capable of being opened and closed, and the pressing head being located above the clamping space. The application can reduce manual operation, improve work efficiency, improve the accuracy of assembling the driving shaft to the wheel edge system, reduce the product failure rate, and be favorable for reducing the production cost.

Description

Technical Field

[0001] This invention relates to machine tools, and more particularly to a drive shaft assembly system and method. Background Technology

[0002] When installing a drive shaft assembly with end-face splines into a wheel rim system, it is necessary to ensure that the end-face spline teeth of the drive shaft are correctly engaged with the tooth grooves of the wheel rim system before fasteners can be used to further lock and fix the drive shaft and wheel rim system together. However, in the actual assembly process, due to the small tooth height of the end-face spline teeth, parts such as control arms and brake discs in the wheel rim system can easily obstruct the connection position during assembly, making it difficult to directly confirm whether the spline teeth are engaged by visual inspection or other means. Therefore, manual judgment can only be made by rotating the drive shaft during the assembly process. This method is inefficient and difficult to judge accurately. When a substandard assembly product is installed in a vehicle, it can easily cause damage to the drive shaft and wheel bearings. In severe cases, it may be necessary to replace parts such as steering knuckles and control arms, increasing production costs. Therefore, a device that can assemble the drive shaft into place is needed. Summary of the Invention

[0003] The purpose of this invention is to provide a drive shaft assembly system and method to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] A drive shaft assembly system according to a first aspect of the present invention.

[0005] A drive shaft assembly system includes: a positioning fixture with a through hole in the center arranged in a vertical direction; a screw-locking mechanism with a screw head that can rotate along the vertical axis, the screw head being located below the through hole, and the screw head being able to pass upward through the through hole or exit downward from the through hole; and a positioning mechanism with a gripper that can rotate along the vertical axis and a pressure head that can move up and down, the gripper being located above the positioning fixture, the gripper having an openable clamping space formed therein, and the pressure head being located above the clamping space.

[0006] This technical solution has at least the following beneficial effects: The wheel rim system to be assembled is installed into the positioning fixture, with the wheel hub bearing within the wheel rim system aligned with the through hole. The drive shaft to be assembled is pre-installed into the wheel rim system. Then, the pressure head in the positioning mechanism moves downwards, pressing against the top of the drive shaft, clamping the drive shaft and wheel rim system vertically. The clamping space within the grippers closes, clamping the top of the drive shaft. Next, the screw head passes upwards through the through hole, and a screw is mounted on the screw head. When the screw head moves upwards, it can insert the screw into the wheel hub bearing of the wheel rim system and connect it to the bottom of the drive shaft. At this point, the drive shaft is initially assembled into the wheel rim system, and the clamping jaws... The drive shaft is rotated. By judging whether the relative rotation angle difference between the drive shaft and the wheel rim system meets the requirements, if the relative rotation angle difference between the drive shaft and the wheel rim system does not meet the requirements, the screws are unscrewed from the drive shaft, the pressure and clamping force on the drive shaft are removed, and the installation position of the drive shaft is adjusted. The above operation is repeated. When the relative rotation angle difference between the drive shaft and the wheel rim system meets the requirements, the screws can be tightened further upwards to fix them, thereby achieving complete assembly of the drive shaft into the wheel rim system. This can reduce manual operation, improve work efficiency, improve the accuracy of drive shaft assembly into the wheel rim system, reduce product defect rate, and help reduce production costs.

[0007] According to some embodiments of the present invention, the positioning mechanism includes a frame, a first lifting drive, a lifting seat, a first rotary drive, and a rotating frame. The first lifting drive is connected to the frame and drives the lifting seat, enabling the lifting seat to move up and down. The first rotary drive is connected to the lifting seat and drives the rotating frame, enabling the rotating frame to rotate along the vertical axis on the bottom side of the lifting seat. The gripper is connected to the rotating frame, and the pressure head is disposed on the bottom side of the lifting seat.

[0008] According to some embodiments of the present invention, a second lifting drive member is connected to the top side of the lifting seat, the movable end of the second lifting drive member passes downward through the lifting seat, and the pressure head is connected to the movable end of the second lifting drive member.

[0009] According to some embodiments of the present invention, the inner side of the gripper is provided with a plurality of teeth surrounding the clamping space.

[0010] According to some embodiments of the present invention, the screw-locking mechanism includes a base, a third lifting drive, a lifting plate, and a second rotating drive. The third lifting drive is connected to the base and drives the lifting plate. The second rotating drive is connected to the top side of the lifting plate and drives the screw head.

[0011] A drive shaft assembly method according to a second aspect of the present invention.

[0012] The drive shaft assembly method, using the aforementioned drive shaft assembly system, includes the following steps: A wheel-side system is installed inside the positioning fixture, and a drive shaft is installed inside the wheel-side system; The pressure head presses downward against the top of the drive shaft, and the clamping space closes and clamps the top of the jaws; The locking screw head is inserted into the connecting screw, the locking screw head passes upward through the through hole, and the connecting screw passes through the wheel-side system and is connected to the bottom end of the drive shaft; The relative angle difference between the wheel-side system and the drive shaft after they are fully engaged is set to an acceptable difference. The gripper drives the drive shaft to rotate, and the difference between the actual rotation angle of the wheel-side system and the actual rotation angle of the drive shaft is the first actual difference value; Determine whether the first actual difference is less than the acceptable difference. If the first actual difference is less than the acceptable difference, determine that the wheel-side system is fully engaged with the drive shaft. The screw head secures the connecting screw to the bottom end of the drive shaft.

[0013] The technical solution has at least the following beneficial effects: by using the above-mentioned drive assembly system for assembly, manual operation can be reduced, work efficiency can be improved, the accuracy of the drive shaft assembly to the wheel-side system can be improved, the product defect rate can be reduced, and production costs can be reduced.

[0014] According to some embodiments of the present invention, when the first actual difference is less than the acceptable difference, the pressure head moves upward away from the top of the drive shaft, the gripper drives the drive shaft to rotate, and the difference between the actual rotation angle of the wheel edge system and the actual rotation angle of the drive shaft is the second actual difference. It is determined whether the second actual difference is less than the acceptable difference. When the second actual difference is less than the acceptable difference, it is determined that the wheel edge system and the drive shaft are fully engaged.

[0015] According to some embodiments of the present invention, a spring is fitted on the connecting screw. When the connecting screw is inserted into the wheel rim system and connected to the bottom end of the drive shaft, the end of the spring abuts against the wheel rim system, and the spring is compressed.

[0016] According to some embodiments of the present invention, when the connecting screw is inserted into the wheel-side system and connected to the bottom end of the drive shaft, the rotational torque of the connecting screw is less than 30 Nm.

[0017] According to some embodiments of the present invention, when the gripper drives the drive shaft to rotate, the rotational torque of the gripper is less than 80 Nm.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be derived from the description. It will become apparent, or will be understood through the practice of the present invention. Attached Figure Description

[0019] 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 explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of the drive shaft assembly system of the present invention.

[0021] Figure 2 This is a perspective view of the gripper of the present invention.

[0022] Figure 3 This is a flowchart of the drive shaft assembly method of the present invention.

[0023] In the attached diagram: 100-positioning fixture, 210-screw head, 220-base, 230-lifting plate, 310-gripper, 311-clamping space, 312-tooth, 320-pressure head, 330-frame, 340-first lifting drive component, 350-lifting seat, 360-rotating frame, 370-second lifting drive component. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0026] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0028] Reference Figure 1 The drive shaft assembly system includes a positioning fixture 100, a locking screw mechanism, and a positioning mechanism. The positioning fixture 100 is used to position the wheel rim system and has an internal shape adapted to position the wheel rim system. A through hole along the vertical direction is provided in the center of the positioning fixture 100. The locking screw mechanism has a locking screw head 210 that can rotate along the vertical axis. The locking screw head 210 is located below the through hole. A drive structure is also provided within the locking screw mechanism to move the locking screw head 210 up and down, allowing the locking screw head 210 to pass upward through the through hole or retract downward from the through hole. The positioning mechanism... The positioning mechanism includes a gripper 310 and a pressure head 320. It is equipped with a drive structure that allows the gripper 310 to rotate along the vertical axis and a drive structure that allows the pressure head 320 to move vertically. The gripper 310 is located above the positioning fixture 100, and an openable clamping space 311 is formed within the gripper 310. The pressure head 320 is located above the clamping space 311. The clamping space 311 within the gripper 310 can be opened and closed manually or automatically. For example, the gripper 310 can be equipped with an electric or pneumatic finger, thus forming an automatically opening and closing clamping space 311 inside.

[0029] As described above, the wheel rim system to be assembled is installed into the positioning fixture 100. At this time, the hub bearing in the wheel rim system is aligned with the through hole. The drive shaft to be assembled is pre-installed into the wheel rim system. Then, the pressure head 320 in the positioning mechanism moves downward and presses against the top of the drive shaft, pressing the drive shaft and the wheel rim system together in the vertical direction. The clamping space 311 in the jaws 310 closes, clamping the top of the drive shaft. Next, the screw head 210 passes upward through the through hole. The screw head is loaded with a screw. When the screw head 210 moves upward, it can insert the screw into the hub bearing of the wheel rim system and connect it to the bottom of the drive shaft. At this time, the drive shaft is initially assembled into the wheel rim system. The claw 310 drives the drive shaft to rotate. By judging whether the relative rotation angle difference between the drive shaft and the wheel rim system meets the requirements, if the relative rotation angle difference between the drive shaft and the wheel rim system does not meet the requirements, the screw is unscrewed from the drive shaft, the pressure and clamping force on the drive shaft are removed, and the installation position of the drive shaft is adjusted. The above operation is repeated. When the relative rotation angle difference between the drive shaft and the wheel rim system meets the requirements, the screw can be further tightened upward with the screw head 210 to achieve complete assembly of the drive shaft into the wheel rim system. This can reduce manual operation, improve work efficiency, improve the accuracy of the drive shaft assembly into the wheel rim system, reduce the product defect rate, and help reduce production costs.

[0030] The positioning mechanism includes a drive structure that can rotate the gripper 310 along the vertical axis. The gripper 310 can maintain a certain height without moving. However, to facilitate avoidance of the drive shaft during assembly, the gripper 310 can be designed to move vertically. Before assembling the drive shaft, the gripper 310 is moved upward to avoid it, and after assembly, the gripper 310 is moved downward. Specifically, the positioning mechanism includes a frame 330, a first lifting drive component 340, a lifting seat 350, a first rotating drive component, and a rotating frame 360. The first lifting drive component 340 is connected to the frame 330 and drives the lifting seat 350. The first lifting drive component 340 can drive the lifting seat 350. To improve the stability of the lifting seat 350's vertical movement, the lifting seat 350 can be slidably connected to the frame 330 in the vertical direction. The first rotary drive component is connected to the lifting seat 350 and drives the rotating frame 360. The first rotary drive component can drive the rotating frame 360 ​​to rotate along the vertical axis on the bottom side of the lifting seat 350. The gripper 310 is connected to the rotating frame 360. The pressure head 320 can be directly set on the frame 330. The vertically movable drive component is set on the frame 330 to drive the pressure head 320 to move up and down. In order to reduce the stroke of the pressure head 320, the pressure head 320 is set on the bottom side of the lifting seat 350.

[0031] In practical applications, the positioning fixture 100 can be directly installed and fixed on the frame 330. In this case, the wheel edge system is manually installed into the positioning fixture 100, or the wheel edge system is loaded into the positioning fixture 100 by a robotic arm. In some embodiments, the positioning fixture 100 can be installed on the external conveyor line, and the conveyor line has multiple positioning fixtures 100. By rotating and conveying multiple positioning fixtures 100, automatic loading into the positioning fixture 100 can be conveniently achieved.

[0032] In the aforementioned positioning mechanism, before assembling the drive shaft, the first lifting drive component 340 moves the lifting seat 350 upward to the beginning of its stroke. At this time, the pressure head 320 and the gripper 310 can free up space for the drive shaft installation, reducing interference with the drive shaft installation. Then, the drive shaft is initially assembled onto the wheel-side system. Next, the first lifting drive component 340 moves the lifting seat 350 downward, causing the pressure head 320 and the gripper 310 to simultaneously approach the drive shaft. The pressure head 320 presses against the top of the drive shaft, and the top of the drive shaft enters the clamping space 311. The clamping space 311 closes, thereby using the gripper 310 to clamp and position the top of the drive shaft. When it is necessary to drive the drive shaft to rotate, the first rotation drive component drives the gripper 310 to rotate through the rotating frame 360, thereby causing the drive shaft to rotate, in order to determine whether the relative rotation angle difference between the drive shaft and the wheel-side system meets the requirements. In this way, the first lifting drive 340 provides driving force in the vertical direction and the first rotating drive provides driving force in the rotation within the positioning mechanism, reducing manual operation and improving work efficiency and stability.

[0033] A drive structure for moving the pressure head 320 up and down is provided on the lifting base 350. Specifically, a second lifting drive component 370 is connected to the top side of the lifting base 350. The movable end of the second lifting drive component 370 passes downward through the lifting base 350, and the pressure head 320 is connected to the movable end of the second lifting drive component 370. In practical applications, a gantry frame can be installed on the top side of the lifting base 350, and the second lifting drive component 370 can be fixed to the gantry frame. A sliding bearing is provided between the movable end of the second lifting drive component 370 and the lifting base 350 to improve the stability of the movement of the second lifting drive component 370. When the pressure head 320 needs to press down on the drive shaft, the movable end of the second lifting drive component 370 moves down and drives the pressure head 320 to press against the top of the drive shaft. When it is necessary to remove the pressure on the drive shaft, the movable end of the second lifting drive shaft moves up to reset.

[0034] In the above embodiments, the drive shaft can be clamped and positioned directly by the friction between the inner side of the gripper 310 and the outer side of the drive shaft. To more stably clamp the gripper 310, a structure adapted to the splines on the drive shaft can be provided on the gripper 310. Specifically, for example... Figure 2As shown, the inner side of the gripper 310 is provided with a plurality of teeth 312 surrounding the clamping space 311. That is, there are two gripping blocks on the electric or pneumatic finger that can move closer or further apart from each other. The two gripping blocks surround each other to form the clamping space 311. On the side of the two gripping blocks facing each other, a plurality of teeth 312 are respectively provided. When the gripper 310 clamps the spline on the drive shaft, the plurality of teeth 312 on the gripper 310 respectively engage with the plurality of keyways of the spline, thereby ensuring that the gripper 310 can drive the drive shaft to rotate synchronously when it rotates.

[0035] The screw-locking mechanism is mainly used to tighten screws upwards or unscrew screws downwards. Specifically, the screw-locking mechanism includes a base 220, a third lifting drive component, a lifting plate 230, and a second rotating drive component. The third lifting drive component is connected to the base 220 and drives the lifting plate 230. The second rotating drive component is connected to the top side of the lifting plate 230 and drives the screw head 210. In practical applications, the base 220 is located beside the frame 330, or the base 220 is connected to the bottom of the frame 330. The lifting plate 230 can be slidably connected to the base 220, thereby improving the stability of the lifting plate 230's vertical movement. Before tightening the screw, the third lifting drive moves the screw head 210 down to the beginning of the stroke via the lifting plate 230. When it is necessary to drive the screw into the bottom of the drive shaft, the screw can be manually loaded onto the screw head 210, or the screw can be automatically loaded onto the screw head 210 by an external mechanical device. Then, the third lifting drive moves the screw head 210 upward via the lifting plate 230, so that the screw passes into the wheel hub bearing of the wheel rim system and abuts against the bottom of the drive shaft. The second rotation drive rotates the screw head 210, screwing the screw into the drive shaft, thereby initially connecting the wheel rim system and the drive shaft.

[0036] In practical applications, the first lifting drive component 340, the second lifting drive component 370, and the third lifting drive component are all used to provide driving force for movement in the vertical direction, and can be driven by electric screws, cylinders, or hydraulic cylinders. The first rotary drive component is used to drive the gripper 310 to move, and can be driven by a rotary cylinder or a drive motor. The second rotary drive component needs to drive the screw to rotate continuously to screw into the bottom end of the drive shaft, and can be driven by a drive motor.

[0037] A drive shaft assembly method according to a second aspect of the present invention.

[0038] like Figure 3 As shown, the drive shaft assembly method, using the aforementioned drive shaft assembly system, includes the following steps: S100, a wheel-side system is installed in the positioning fixture 100, and a drive shaft is installed in the wheel-side system; S200, the pressure head 320 presses downward against the top of the drive shaft, and the clamping space 311 closes and clamps the top of the jaw 310; S300, the locking screw head 210 is inserted into the connecting screw, the locking screw head 210 passes upward through the through hole, and the connecting screw passes through the wheel-side system and is connected to the bottom end of the drive shaft; S400, the relative angle difference between the wheel-side system and the drive shaft after they are fully engaged is set to an acceptable difference. S500, the gripper 310 drives the drive shaft to rotate, and the difference between the actual rotation angle of the wheel-side system and the actual rotation angle of the drive shaft is the first actual difference value; S600, determine whether the first actual difference is less than the acceptable difference; when the first actual difference is less than the acceptable difference, determine that the wheel-side system is fully engaged with the drive shaft. S700, the screw head 210 locks the connecting screw to the bottom end of the drive shaft.

[0039] Using the aforementioned drive shaft assembly system and method to assemble the drive shaft reduces manual labor, improves work efficiency, enhances the accuracy of drive shaft assembly onto the wheel-side system, reduces product defect rate, and helps lower production costs.

[0040] In step S500, since the pressure head 320 is pressing downward against the top of the drive shaft, there is significant friction between the bottom of the drive shaft and the wheel hub bearing of the wheel rim system. At this time, the drive shaft is directly rotated by the gripper 310, or the wheel hub bearing in the wheel rim system may be rotated due to the large friction between the drive shaft and the wheel hub bearing. Therefore, in order to improve the accuracy of determining whether the wheel rim system and the drive shaft are fully engaged, in step S600, when the first actual difference is less than the acceptable difference, the pressure head 320 moves upward away from the top of the drive shaft, and the gripper 310 drives the drive shaft to rotate. The difference between the actual rotation angle of the wheel rim system and the actual rotation angle of the drive shaft is the second actual difference. It is determined whether the second actual difference is less than the acceptable difference. When the second actual difference is less than the acceptable difference, it is determined that the wheel rim system and the drive shaft are fully engaged. At this point, the drive shaft is first rotated while the pressure head 320 is pressing against it. If the first actual difference is greater than or equal to the acceptable difference, it can be determined that the drive shaft is not properly assembled. In practical applications, the connecting screws need to be unscrewed from the bottom of the drive shaft, and the pressure and clamping force on the drive shaft need to be removed. The assembly position of the drive shaft needs to be adjusted, and then step S200 needs to be repeated until the first actual difference is less than the acceptable difference. Then, the pressure head 320 is moved upward so that it leaves the top of the drive shaft, and the drive shaft is rotated by the gripper 310. At this time, the difference between the actual rotation angle of the wheel-side system and the actual rotation angle of the drive shaft is the second actual difference. Only when the second actual difference is less than the acceptable value can it be determined that the drive shaft is properly assembled. Otherwise, the connecting screws need to be unscrewed from the bottom of the drive shaft, and the pressure and clamping force on the drive shaft need to be removed. The assembly position of the drive shaft needs to be adjusted, and then step S200 needs to be repeated. This can further improve the accuracy of determining whether the drive shaft is properly assembled.

[0041] In step S300, after the connecting screw is screwed into the bottom end of the drive shaft, it is not fully locked. At this time, the drive shaft and the wheel rim system can be initially positioned. In order to provide preload between the two, in this embodiment, a spring is fitted on the connecting screw. When the connecting screw is inserted into the wheel rim system and connected to the bottom end of the drive shaft, the end of the spring abuts against the wheel rim system, and the spring is compressed. In practical applications, the spring is fitted into the shaft of the connecting screw, and then a rubber ring is fitted on the shaft to prevent the spring from coming off the connecting screw. The spring is tower-shaped, with its small diameter abutting against the head of the connecting screw, and its large diameter abutting against the wheel hub bearing of the wheel rim system. As the connecting screw is screwed into the bottom end of the drive shaft, the spring is compressed, and the spring force can further tighten and position the drive shaft in the wheel rim system. This makes the structure stable when the drive shaft is initially assembled into the wheel rim system in step S300, and it is also beneficial to determine whether the teeth at the bottom end of the drive shaft are correctly meshed with the teeth in the wheel rim system by rotating the drive shaft in the next step.

[0042] In step S300, when the connecting screw is inserted into the wheel rim system and connected to the bottom end of the drive shaft, the torque of the connecting screw is less than 30 Nm, for example, 12 Nm, 15 Nm, or 18 Nm. By controlling the torque when the connecting screw is screwed into the drive shaft, the degree of fit between the connecting screw and the drive shaft, as well as the preload force provided for the connection between the drive shaft and the wheel rim system, are controlled.

[0043] In step S500, when the gripper 310 drives the drive shaft to rotate, the torque of the gripper 310 is less than 80 Nm, that is, the torque provided by the first rotary drive member to the gripper 310 is between 0 and 80 Nm. Under this torque, the drive shaft can be effectively rotated to determine whether the wheel hub bearings in the wheel-side system are rotating synchronously, and the driving force can be better saved. In practical applications, the travel occupied by the tooth width of one tooth at the bottom of the drive shaft is taken as one unit, and the torque provided by the gripper 310 is enough to cause the drive shaft to rotate by one unit angle. For example, if it is necessary to drive the drive shaft to rotate by one unit angle of 3 degrees, the torque of the gripper 310 is 40 Nm.

[0044] Naturally, after completing step S700, the assembled drive shaft and wheel-side system can be removed from the drive shaft assembly system.

[0045] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A drive shaft assembly system, characterized in that: include: The positioning fixture has a through hole in the middle that runs vertically. A screw-locking mechanism has a screw-locking head that can rotate along an upper and lower axis. The screw-locking head is located below the through hole and can pass through the through hole upward or exit the through hole downward. The positioning mechanism has a gripper that can rotate along a vertical axis and a pressure head that can move vertically. The gripper is located above the positioning fixture and has an openable clamping space formed inside it. The gripper is used to clamp the top of the drive shaft. The pressure head is located above the clamping space and is used to press against the top of the drive shaft. The positioning mechanism includes a frame, a first lifting drive component, a lifting seat, a first rotary drive component, and a rotating frame. The first lifting drive component is connected to the frame and drives the lifting seat, enabling the lifting seat to move up and down. The first rotary drive component is connected to the lifting seat and drives the rotating frame, enabling the rotating frame to rotate along the vertical axis on the bottom side of the lifting seat. The gripper is connected to the rotating frame, and the pressure head is located on the bottom side of the lifting seat.

2. The drive shaft assembly system according to claim 1, characterized in that: The top side of the lifting seat is connected to a second lifting drive component, the movable end of the second lifting drive component passes downward through the lifting seat, and the pressure head is connected to the movable end of the second lifting drive component.

3. The drive shaft assembly system according to claim 1, characterized in that: The inner side of the gripper is provided with multiple locking teeth surrounding the clamping space.

4. The drive shaft assembly system according to claim 1, characterized in that: The screw-locking mechanism includes a base, a third lifting drive component, a lifting plate, and a second rotating drive component. The third lifting drive component is connected to the base and drives the lifting plate. The second rotating drive component is connected to the top side of the lifting plate and drives the screw head.

5. A drive shaft assembly method, characterized in that: Using the drive shaft assembly system as described in any one of claims 1 to 4, the following steps are included: A wheel-side system is installed inside the positioning fixture, and a drive shaft is installed inside the wheel-side system; The pressure head presses downward against the top of the drive shaft, and the clamping space closes and clamps the top of the drive shaft; The locking screw head is inserted into the connecting screw, the locking screw head passes upward through the through hole, and the connecting screw passes through the wheel-side system and is connected to the bottom end of the drive shaft; The relative angle difference between the wheel-side system and the drive shaft after they are fully engaged is set to an acceptable difference. The gripper drives the drive shaft to rotate, and the difference between the actual rotation angle of the wheel-side system and the actual rotation angle of the drive shaft is the first actual difference value; Determine whether the first actual difference is less than the acceptable difference. If the first actual difference is less than the acceptable difference, determine that the wheel-side system is fully engaged with the drive shaft. The screw head secures the connecting screw to the bottom end of the drive shaft.

6. The drive shaft assembly method according to claim 5, characterized in that: When the first actual difference is less than the acceptable difference, the pressure head moves upward away from the top of the drive shaft, and the gripper drives the drive shaft to rotate. The difference between the actual rotation angle of the wheel edge system and the actual rotation angle of the drive shaft is the second actual difference. It is determined whether the second actual difference is less than the acceptable difference. When the second actual difference is less than the acceptable difference, it is determined that the wheel edge system and the drive shaft are fully engaged.

7. The drive shaft assembly method according to claim 5, characterized in that: A spring is fitted onto the connecting screw. When the connecting screw is inserted into the wheel rim system and connected to the bottom end of the drive shaft, the end of the spring abuts against the wheel rim system, and the spring is compressed.

8. The drive shaft assembly method according to claim 7, characterized in that: When the connecting screw is inserted into the wheel-side system and connected to the bottom end of the drive shaft, the rotational torque of the connecting screw is less than 30 Nm.

9. The drive shaft assembly method according to claim 5, characterized in that: When the gripper drives the drive shaft to rotate, the rotational torque of the gripper is less than 80 Nm.

Images