An assembling and tightening tool and method for an automobile steering gear assembly

Abstract

The application discloses an assembling and tightening tool and method for a steering gear assembly of an automobile, and relates to the field of tightening devices for assembling automobile parts.The technical scheme is as follows: a rack is provided with a left pull rod positioning mechanism for positioning a left pull rod, a screw rod and nut positioning mechanism for positioning a screw rod and nut component, and a right pull rod positioning mechanism for positioning a right pull rod in sequence.The tightening tool further comprises a torque gun, a sleeve wrench fixedly connected to the output end of the torque gun, and a driving assembly for driving the sleeve wrench to move towards or away from the right pull rod positioning mechanism.The sleeve wrench is provided with a locking groove adapted to a locking nut and a locking head adapted to an inner hexagonal groove of the right pull rod.The application has the advantages of simple and quick process, reduced labor input, improved work efficiency, simple and compact structure, and easy workpiece taking and placing.

Description

Technical Field

[0001] This invention relates to the field of tightening devices for assembling automotive parts, and more specifically, to an assembly tightening fixture and method for an automotive steering gear assembly. Background Technology

[0002] Tightening is the most common assembly process in automotive parts assembly. Different automotive parts are designed with different tightening requirements, such as... Figure 6 The illustrated automotive steering gear assembly 13 mainly includes a lead screw and nut assembly 132, a left tie rod 131, a right tie rod 133, and a locking nut 134. The lead screw and nut assembly 132 includes a lead screw assembly 1321 and a nut assembly 1322 rotatably connected to the lead screw assembly 1321. One end of the nut assembly 1322 is rotatably connected to a bearing 1323, and the other end of the nut assembly 1322 is provided with a limit groove 1324. During assembly, the nut assembly 1322 needs to be pre-tightened manually. The locking nut 134 on 2 is finally locked onto the nut component 1322. Then, one end of the left pull rod 131 and one end of the right pull rod 133 are respectively threaded to the left and right ends of the lead screw component 1321. The other end of the left pull rod 131 is provided with a pin groove, and the other end of the right pull rod 133 is provided with an internal hexagonal groove. The existing tightening fixture for the above-mentioned automotive steering gear component 13 requires changing multiple workstations and performing multiple assembly and tightening operations. The process is cumbersome, requires a lot of manual labor, and has low work efficiency.

[0003] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an assembly and tightening fixture and method for automotive steering gear components. The process is simple and quick, reduces the input of manual labor, effectively improves work efficiency, and has the advantages of simple and compact structure and easy workpiece handling.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an assembly and tightening fixture and method for an automotive steering gear assembly, comprising a frame, wherein a left pull rod positioning mechanism for positioning a left pull rod, a lead screw and nut positioning mechanism for positioning a lead screw and nut assembly, and a right pull rod positioning mechanism for positioning a right pull rod are sequentially arranged on the frame; the tightening fixture further comprises a torque gun, a socket wrench fixedly connected to the output end of the torque gun, and a drive assembly for driving the socket wrench to move toward or away from the right pull rod positioning mechanism; the socket wrench is respectively provided with a locking groove adapted to the locking nut and a locking head adapted to the internal hexagonal groove of the right pull rod; the right pull rod positioning mechanism can be raised and lowered longitudinally; when the right pull rod positioning mechanism is raised to the position, the positioning axis of the left pull rod positioning mechanism, the positioning axis of the lead screw and nut positioning mechanism, the positioning axis of the right pull rod positioning mechanism, and the axis of the socket wrench are on the same extended axis.

[0006] In one embodiment, the left pull rod positioning mechanism includes a first slide rail fixed to the frame, a first slide plate slidably connected to the first slide rail, and a first mounting base fixedly connected to the first slide plate. The first mounting base is provided with a first slot for inserting the left pull rod, and the first mounting base is also provided with a pin that can be inserted into the pin groove of the left pull rod. The first slide plate is provided with a first locking knob for locking the first slide plate on the first slide rail.

[0007] In one embodiment, the lead screw nut positioning mechanism includes a second slide rail fixed to the frame, a second slide plate slidably connected to the second slide rail, and a gripper cylinder fixed to the second slide plate. The gripper cylinder includes two clamping blocks that can clamp the bearings on the nut component. A second mounting base is fixed on the frame between the gripper cylinder and the left pull rod positioning mechanism. The second mounting base is provided with a second slot for inserting the nut component. A limiting buckle is provided on the inner side wall of the second slot for engaging the limiting slot. A second locking knob is provided on the second slide plate for locking the second slide plate onto the second slide rail.

[0008] In one embodiment, the right pull rod positioning mechanism includes a lifting cylinder fixed on the frame and a contouring platform fixed on the output end of the lifting cylinder, wherein the contouring platform is provided with a contouring groove adapted to the right pull rod.

[0009] In one embodiment, the driving component is a linear motion module, which includes a base fixed on a frame, a third slide rail fixed on the base, a drive plate slidably connected to the third slide rail, and a servo drive structure for driving the drive plate to slide. A connecting plate is slidably connected to the third slide rail, and the connecting plate and the drive plate are connected by a flexible connector. A first connecting sleeve and a second connecting sleeve are respectively provided on the connecting plate. The torque gun is fixedly connected to the first connecting sleeve, and the socket wrench is rotatably connected to the second connecting sleeve.

[0010] In one embodiment, the flexible connector includes a guide sleeve fixed to the drive plate, a guide shaft fixed to the connecting plate, and a tension spring fixedly connected between the drive plate and the connecting plate, wherein the end of the guide shaft away from the connecting plate is slidably connected to the guide sleeve.

[0011] In one embodiment, a first position sensor is provided on one side of the lead screw nut positioning mechanism and a second position sensor is provided on one side of the right pull rod positioning mechanism on the base. An initial position sensor is also provided on the base. A lever is provided on the drive board that can trigger the initial position sensor, the second position sensor and the first position sensor respectively to cut off the power of the servo drive structure.

[0012] In one embodiment, the tightening fixture further includes a traceability system, and the torque gun is electrically connected to the traceability system.

[0013] A method for assembling and tightening an automotive steering gear assembly, comprising any of the aforementioned automotive steering gear assembly assembly and tightening fixtures, and further comprising the following steps:

[0014] S1. First, install the left pull rod on the left pull rod positioning mechanism, then install the screw nut assembly on the screw nut positioning mechanism, and finally install the right pull rod on the right pull rod positioning mechanism.

[0015] S2. During operation, the right pull rod positioning mechanism descends below the extended axis, and the drive assembly drives the socket wrench to move toward the lead screw nut positioning mechanism, so that the locking groove of the socket wrench is fitted onto the locking nut. The torque gun drives the socket wrench to rotate, so as to lock the locking nut onto the nut component.

[0016] S3. After completing step S2, the drive assembly drives the socket wrench to retract to one side of the right pull rod positioning mechanism.

[0017] S4. The right pull rod positioning mechanism rises to the extended axis, and the left pull rod positioning mechanism moves to the right, so that the lead screw nut component is partially disengaged from the lead screw nut positioning mechanism, thereby releasing the circumferential restriction of the lead screw nut component by the lead screw nut positioning mechanism, and causing the lead screw nut component to abut between the left pull rod and the right pull rod.

[0018] S5. The locking head of the socket wrench extends into the internal hexagonal groove of the right pull rod, causing the right pull rod to rotate. After the right pull rod is threadedly tightened with the lead screw assembly, it causes the lead screw assembly to be threadedly tightened with the left pull rod.

[0019] In summary, the present invention has the following beneficial effects: Through the arrangement of the left pull rod positioning mechanism, the lead screw and nut positioning mechanism, the right pull rod positioning mechanism, the torque gun, the socket wrench, and the drive assembly, before use, the left pull rod is first installed on the left pull rod positioning mechanism, then the lead screw and nut assembly is installed on the lead screw and nut positioning mechanism, and finally the right pull rod is installed on the right pull rod positioning mechanism. During operation, the right pull rod positioning mechanism descends below the extended axis, and the drive assembly drives the socket wrench to move towards the lead screw and nut positioning mechanism, causing the locking groove of the socket wrench to fit onto the locking nut. The torque gun drives the socket wrench... The wrench rotates to lock the locking nut onto the nut assembly; the drive assembly drives the socket wrench to retract to one side of the right pull rod positioning mechanism; the right pull rod positioning mechanism rises to the extended axis, and the left pull rod positioning mechanism moves to the right, causing the lead screw nut assembly to partially disengage from the lead screw nut positioning mechanism, thereby releasing the circumferential restriction of the lead screw nut assembly by the lead screw nut positioning mechanism, and causing the lead screw nut assembly to abut between the left and right pull rods; the locking head of the socket wrench extends into the internal hexagonal groove of the right pull rod, driving the right pull rod to rotate. After the right pull rod and the lead screw assembly are threaded together, the lead screw assembly is then threaded together with the left pull rod. Compared with the traditional method, the tightening of the locking nut and the nut assembly, as well as the tightening of the left pull rod, right pull rod, and lead screw nut assembly, can be completed by clamping the left pull rod, right pull rod, and lead screw assembly in one operation. The process is simple and quick, reducing the input of manual labor, effectively improving work efficiency, and has the advantages of simple and compact structure and easy workpiece handling. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the assembly and tightening fixture for an automotive steering gear assembly according to an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the left tie rod positioning mechanism and the lead screw nut positioning mechanism in the assembly and tightening fixture of the automobile steering gear assembly according to an embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the limiting buckle in the assembly and tightening fixture of the automotive steering gear assembly according to an embodiment of this application;

[0023] Figure 4 for Figure 1 Enlarged view of section A in the middle;

[0024] Figure 5This is a schematic diagram of the structure of the first position sensor, the second position sensor, and the initial position sensor in the assembly and tightening fixture of the automotive steering gear assembly according to an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the structure of a car steering system assembly.

[0026] In the diagram: 1. Frame; 2. Left pull rod positioning mechanism; 21. First slide rail; 22. First slide plate; 23. First mounting base; 24. Pin; 25. First locking knob; 3. Screw nut positioning mechanism; 31. Second slide rail; 32. Second slide plate; 33. Gripper cylinder; 34. Grip block; 35. Second mounting base; 351. Limit buckle; 4. Right pull rod positioning mechanism; 41. Lifting cylinder; 42. Contouring platform; 5. Drive assembly; 51. Base; 52. Third slide rail; 53. Drive plate; 54. Connecting plate; 6. Torque gun; 7. Socket wrench; 8. First position sensor; 9. Second position sensor; 10. Initial position sensor; 11. Paddle shifter; 12. Flexible connector; 121. Guide sleeve; 122. Guide shaft; 123. Tension spring; 13. Automotive steering assembly; 131. Left tie rod; 132. Lead screw and nut assembly; 1321. Lead screw assembly; 1322. Nut assembly; 1323. Bearing; 1324. Limiting slot; 133. Right tie rod; 134. Locking nut. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1As shown, an embodiment of this application provides an assembly and tightening fixture and method for an automotive steering gear assembly, including a frame 1. The frame 1 is sequentially equipped with a left pull rod positioning mechanism 2 for positioning the left pull rod, a screw and nut positioning mechanism 3 for positioning the screw and nut assembly, and a right pull rod positioning mechanism 4 for positioning the right pull rod. The tightening fixture also includes a torque gun 6, a socket wrench 7 fixedly connected to the output end of the torque gun 6, and a drive assembly 5 for driving the socket wrench 7 to move toward or away from the right pull rod positioning mechanism 4. The socket wrench 7 is respectively provided with a locking groove adapted to the locking nut and a locking head adapted to the internal hexagonal groove of the right pull rod. The right pull rod positioning mechanism 4 can be raised and lowered longitudinally. When the right pull rod positioning mechanism 4 is raised to its position, the positioning axis of the left pull rod positioning mechanism 2, the positioning axis of the screw and nut positioning mechanism 3, the positioning axis of the right pull rod positioning mechanism 4, and the axis of the socket wrench 7 are on the same extended axis.

[0029] It should be noted that during the assembly process, the lead screw component and the nut component can be kept locked in a locked state through their own structure, and there is no relative rotation between the two.

[0030] When the above-mentioned assembly and tightening fixture is in operation, first install the left pull rod on the left pull rod positioning mechanism 2, then install the screw nut assembly on the screw nut positioning mechanism 3, and finally install the right pull rod on the right pull rod positioning mechanism 4; the right pull rod positioning mechanism 4 descends below the extended axis, the drive assembly 5 drives the socket wrench 7 to move toward the screw nut positioning mechanism 3, and so that the locking groove of the socket wrench is fitted onto the locking nut, and the torque gun 6 drives the socket wrench 7 to rotate, so as to lock the locking nut onto the nut assembly; the drive assembly 5 drives the socket wrench The wrench 7 retracts to one side of the right pull rod positioning mechanism 4; the right pull rod positioning mechanism 4 rises to the extended axis, and the left pull rod positioning mechanism 2 moves to the right, causing the lead screw nut component to partially disengage from the lead screw nut positioning mechanism 3, thereby releasing the circumferential restriction of the lead screw nut component by the lead screw nut positioning mechanism 3, and causing the lead screw nut component to abut between the left pull rod and the right pull rod; the locking head of the socket wrench 7 extends into the internal hexagonal groove of the right pull rod, driving the right pull rod to rotate, and after the right pull rod and the lead screw component are threadedly tightened, the lead screw component is then threadedly tightened with the left pull rod.

[0031] With the above setup, compared with the traditional method, the tightening of the locking nut and nut components can be completed by clamping the left pull rod, right pull rod and lead screw nut components in one go, and the tightening of the left pull rod, right pull rod and lead screw components can also be completed. The process is simple and quick, reduces the input of manual labor, effectively improves work efficiency, and has the advantages of simple and compact structure and easy workpiece handling.

[0032] In this embodiment, as Figure 2As shown, the left pull rod positioning mechanism 2 includes a first slide rail 21 fixed on the frame 1, a first slide plate 22 slidably connected to the first slide rail 21, and a first mounting base 23 fixedly connected to the first slide plate 22. The first mounting base 23 is provided with a first slot for inserting the left pull rod, and the first mounting base 23 is also provided with a pin 24 that can be inserted into the pin groove of the left pull rod. The first mounting base 23 is provided with a slot for inserting the pin 24, and the first slide plate 22 is provided with a first locking knob 25 for locking the first slide plate 22 on the first slide rail 21.

[0033] When the left pull rod positioning mechanism 2 is working, the left pull rod is inserted into the first slot, and the pin 24 is inserted into the slot to achieve a fixed connection between the left pull rod and the left pull rod positioning mechanism 2. After the locking operation of the locking nut is completed on the screw nut positioning mechanism 3, the first slide plate 22 is pushed toward the screw nut positioning mechanism 3 to push the screw nut component out of the screw nut positioning mechanism 3, so that the screw nut component is pressed between the left pull rod and the right pull rod. Then, the first knob is tightened to lock the first slide plate 22 onto the first slide rail 21. It has the advantages of simple structure and convenient and quick operation.

[0034] In this embodiment, as Figure 2 and Figure 3 As shown, the lead screw nut positioning mechanism 3 includes a second slide rail 31 fixed on the frame 1, a second slide plate 32 slidably connected to the second slide rail 31, and a gripper cylinder 33 fixed on the second slide plate 32. The gripper cylinder 33 includes two clamping blocks 34 that can clamp the bearings on the nut component. A second mounting base 35 is fixed on the frame 1 between the gripper cylinder 33 and the left pull rod positioning mechanism 2. The second mounting base 35 is provided with a second slot for inserting the nut component. The inner side wall of the second slot is provided with a limiting buckle 351 for the limiting slot to engage. The second slide plate 32 is provided with a second locking knob for locking the second slide plate 32 on the second slide rail 31.

[0035] When the aforementioned lead screw and nut positioning mechanism 3 is working, the nut component with the lead screw component is first inserted into the second slot, and the limiting slot of the nut component is engaged with the limiting buckle 351 of the second slot to achieve circumferential limiting of the nut component. Then, the second slide plate 32 is moved to the target position and locked onto the second slide rail 31 by the second locking knob. The two clamping blocks 34 of the gripper cylinder 33 are clamped onto the outer peripheral wall of the bearing on the nut component to achieve axial limiting of the nut component. At this time, it is convenient for the socket wrench 7 to perform locking operation on the locking nut.

[0036] In this embodiment, as Figure 1As shown, the right pull rod positioning mechanism 4 includes a lifting cylinder 41 fixed on the frame 1 and a contouring platform 42 fixed on the output end of the lifting cylinder 41. The contouring platform 42 is provided with a contouring groove that is adapted to the right pull rod.

[0037] When the right pull rod positioning mechanism 4 is working, the right pull rod is placed in the contour groove, so that the left pull rod, the lead screw nut component and the right pull rod are on the same axis. The clamping block 34 releases the bearing, and the left pull rod positioning mechanism 2 drives the left pull rod to push out the lead screw nut component, so that the limiting slot is disengaged from the limiting buckle 351, thereby releasing the circumferential limitation on the nut component, and making the lead screw nut component abut between the left pull rod and the right pull rod. The socket wrench 7 drives the right pull rod to rotate and moves the right pull rod towards the left pull rod. After the right pull rod is threaded with the lead screw component of the lead screw nut component, it drives the lead screw component to be threaded with the left pull rod.

[0038] The above method allows for simultaneous thread tightening of the left and right tie rods and lead screw components at the same workstation, offering advantages such as high work efficiency and good work consistency.

[0039] In another embodiment, the lead screw and nut positioning mechanism 3 may not loosen the lead screw and nut component initially, so that the lead screw and nut component does not rotate circumferentially. After the right pull rod is tightened on the lead screw and nut component, the left pull rod positioning mechanism 2 drives the left pull rod to push the lead screw and nut component out, so that the limiting slot is disengaged from the limiting buckle 351, thereby releasing the circumferential limitation on the nut component and making the lead screw and nut component press against the left pull rod and the right pull rod. At the same time, the socket wrench 7 drives the right pull rod to rotate and moves the right pull rod towards the left pull rod, thereby tightening the left pull rod.

[0040] In this embodiment, as Figure 1 and Figure 4 As shown, the drive assembly 5 is a linear motion module. The linear motion module includes a base 51 fixed on the frame 1, a third slide rail 52 fixed on the base 51, a drive plate 53 slidably connected to the third slide rail 52, and a servo drive structure for driving the drive plate 53 to slide. The servo drive structure adopts existing technology and may specifically include a lead screw and nut pair structure and a servo motor. A connecting plate 54 is slidably connected to the third slide rail 52. The connecting plate 54 and the drive plate 53 are connected by a flexible connector 12. A first connecting sleeve and a second connecting sleeve are respectively provided on the connecting plate 54. The torque gun 6 is fixedly connected to the first connecting sleeve, and the socket wrench 7 is rotatably connected to the second connecting sleeve.

[0041] Specifically, the flexible connector 12 includes a guide sleeve 121 fixed on the drive plate 53, a guide shaft 122 fixed on the connecting plate 54, and a tension spring 123 fixedly connected between the drive plate 53 and the connecting plate 54. The end of the guide shaft 122 away from the connecting plate 54 is slidably connected to the guide sleeve 121.

[0042] The above method, through the setting of the flexible connector 12, allows the socket wrench 7 to elastically buffer against the locking nut or right pull rod along the axial direction, avoiding the problem of severe wear on the workpiece caused by hard contact.

[0043] In this embodiment, as Figure 5 As shown, a first position sensor 8 is provided on one side of the lead screw nut positioning mechanism 3 on the base 51, and a second position sensor 9 is provided on one side of the right pull rod positioning mechanism 4. An initial position sensor 10 is also provided on the base 51. A lever 11 is provided on the drive plate 53, which can trigger the initial position sensor 10, the second position sensor 9, and the first position sensor 8 respectively to cut off the power of the servo drive structure. The specific working methods of the first position sensor 8, the second position sensor, and the initial position sensor 10 adopt existing technology, and their working methods and the connection methods of other devices are not described in this embodiment.

[0044] The above settings enable the drive board 53 to stop precisely at the initial position, the first position, and the second position, providing effective error prevention and improving the precision of the tightening operation of the automotive steering gear assembly.

[0045] In this embodiment, the tightening fixture further includes a traceability system, and the torque gun 6 is electrically connected to the traceability system. The traceability system specifically includes a data acquisition unit for collecting torque data from the torque gun 6 during the tightening process, a control module for providing control signals, and a storage management unit for storing the torque data and building a database based on the torque data. The control module controls the traceability system to be turned on or off, and the data acquisition unit and the storage management unit are electrically connected to the control module. It is understood that other existing traceability systems can also be used.

[0046] The above settings make the process parameters of the entire tightening operation traceable.

[0047] The present invention also discloses a method for assembling and tightening an automotive steering gear assembly, including any of the aforementioned automotive steering gear assembly assembly and tightening fixtures, and further comprising the following steps:

[0048] S1. First, install the left pull rod on the left pull rod positioning mechanism 2, then install the screw nut assembly on the screw nut positioning mechanism 3, and finally install the right pull rod on the right pull rod positioning mechanism 4.

[0049] S2. During operation, the right pull rod positioning mechanism 4 descends below the extended axis, and the drive assembly 5 drives the socket wrench 7 to move toward the lead screw nut positioning mechanism 3, so that the locking groove of the socket wrench is fitted onto the locking nut. The torque gun 6 drives the socket wrench 7 to rotate, so as to lock the locking nut onto the nut component.

[0050] S3. After completing step S2, the drive assembly 5 drives the socket wrench 7 to retract to one side of the right pull rod positioning mechanism 4.

[0051] S4. The right pull rod positioning mechanism 4 rises to the extended axis, and the left pull rod positioning mechanism 2 moves to the right, so that the lead screw nut component is partially disengaged from the lead screw nut positioning mechanism 3, thereby releasing the circumferential restriction of the lead screw nut component by the lead screw nut positioning mechanism 3, and causing the lead screw nut component to abut between the left pull rod and the right pull rod.

[0052] S5. The locking head of the socket wrench 7 extends into the internal hexagonal groove of the right pull rod, causing the right pull rod to rotate. After the right pull rod is threadedly tightened with the lead screw assembly, the lead screw assembly is then threadedly tightened with the left pull rod.

[0053] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An assembly and tightening fixture for an automotive steering gear assembly, comprising a frame (1), characterized in that: The frame (1) is sequentially provided with a left pull rod positioning mechanism (2) for positioning the left pull rod, a screw nut positioning mechanism (3) for positioning the screw nut assembly, and a right pull rod positioning mechanism (4) for positioning the right pull rod. The tightening fixture also includes a torque gun (6), a socket wrench (7) fixedly connected to the output end of the torque gun (6), and a drive assembly (5) for driving the socket wrench (7) to move toward or away from the right pull rod positioning mechanism (4). The socket wrench (7) is provided with a locking groove adapted to the locking nut and a locking head adapted to the internal hexagonal groove of the right pull rod. The right pull rod positioning mechanism (4) can be raised and lowered longitudinally. When the right pull rod positioning mechanism (4) is raised to the position, the positioning axis of the left pull rod positioning mechanism (2), the positioning axis of the screw nut positioning mechanism (3), the positioning axis of the right pull rod positioning mechanism (4), and the axis of the socket wrench (7) are on the same extended axis.

2. The assembly and tightening fixture for the automotive steering gear assembly according to claim 1, characterized in that: The left pull rod positioning mechanism (2) includes a first slide rail (21) fixed on the frame (1), a first slide plate (22) slidably connected to the first slide rail (21), and a first mounting base (23) fixedly connected to the first slide plate (22). The first mounting base (23) is provided with a first slot for inserting the left pull rod, and the first mounting base (23) is also provided with a pin (24) that can be inserted into the pin groove of the left pull rod. The first slide plate (22) is provided with a first locking knob (25) for locking the first slide plate (22) on the first slide rail (21).

3. The assembly and tightening fixture for the automotive steering gear assembly according to claim 2, characterized in that: The lead screw nut positioning mechanism (3) includes a second slide rail (31) fixed on the frame (1), a second slide plate (32) slidably connected to the second slide rail (31), and a gripper cylinder (33) fixed on the second slide plate (32). The gripper cylinder (33) includes two clamping blocks (34) that can clamp the bearing on the nut component. A second mounting seat (35) is fixed on the frame (1) between the gripper cylinder (33) and the left pull rod positioning mechanism (2). A second slot for inserting the nut component is provided on the second mounting seat (35). A limit buckle (351) for the limit slot to be engaged is provided on the inner side wall of the second slot. A second locking knob for locking the second slide plate (32) on the second slide rail (31) is provided on the second slide plate (32).

4. The assembly and tightening fixture for the automotive steering gear assembly according to claim 1, characterized in that: The right pull rod positioning mechanism (4) includes a lifting cylinder (41) fixed on the frame (1) and a contouring platform (42) fixed on the output end of the lifting cylinder (41). The contouring platform (42) is provided with a contouring groove that is compatible with the right pull rod.

5. The assembly and tightening fixture for an automotive steering gear assembly according to claim 1, characterized in that: The drive assembly (5) is a linear motion module. The linear motion module includes a base (51) fixed on the frame (1), a third slide rail (52) fixed on the base (51), a drive plate (53) slidably connected to the third slide rail (52), and a servo drive structure for driving the drive plate (53) to slide. A connecting plate (54) is slidably connected on the third slide rail (52). The connecting plate (54) and the drive plate (53) are connected by a flexible connector (12). A first connecting sleeve and a second connecting sleeve are respectively provided on the connecting plate (54). The torque gun (6) is fixedly connected to the first connecting sleeve, and the socket wrench (7) is rotatably connected to the second connecting sleeve.

6. The assembly and tightening fixture for an automotive steering gear assembly according to claim 5, characterized in that: The flexible connector (12) includes a guide sleeve (121) fixed on the drive plate (53), a guide shaft (122) fixed on the connecting plate (54), and a tension spring (123) fixedly connected between the drive plate (53) and the connecting plate (54). The end of the guide shaft (122) away from the connecting plate (54) is slidably connected to the guide sleeve (121).

7. The assembly and tightening fixture for an automotive steering gear assembly according to claim 5, characterized in that: A first position sensor (8) is provided on one side of the lead screw nut positioning mechanism (3) and a second position sensor (9) is provided on one side of the right pull rod positioning mechanism (4) on the base (51). An initial position sensor (10) is also provided on the base (51). A paddle (11) is provided on the drive plate (53) that can trigger the initial position sensor (10), the second position sensor (9) and the first position sensor (8) respectively to cut off the power of the servo drive structure.

8. The assembly and tightening fixture for an automotive steering gear assembly according to claim 1, characterized in that: The tightening fixture also includes a traceability system, and the torque gun (6) is electrically connected to the traceability system.

9. A method for assembling and tightening an automotive steering gear assembly, comprising the assembly and tightening fixture for the automotive steering gear assembly as described in any one of claims 1-8, characterized in that: It also includes the following steps: S1. First, install the left pull rod on the left pull rod positioning mechanism (2), then install the screw nut assembly on the screw nut positioning mechanism (3), and finally install the right pull rod on the right pull rod positioning mechanism (4). S2. During operation, the right pull rod positioning mechanism (4) descends to below the extended axis, the drive assembly (5) drives the socket wrench (7) to move toward the screw nut positioning mechanism (3), and the locking groove of the socket wrench is fitted onto the locking nut. The torque gun (6) drives the socket wrench (7) to rotate, so as to lock the locking nut onto the nut component. S3. After completing step S2, the drive assembly (5) drives the socket wrench (7) to retract to one side of the right pull rod positioning mechanism (4); S4. The right pull rod positioning mechanism (4) rises to the extended axis, and the left pull rod positioning mechanism (2) moves to the right, so that the screw nut component is partially disengaged from the screw nut positioning mechanism (3) to release the circumferential restriction of the screw nut component by the screw nut positioning mechanism (3) and so that the screw nut component abuts between the left pull rod and the right pull rod. S5. The locking head of the socket wrench (7) extends into the internal hexagonal groove of the right pull rod, causing the right pull rod to rotate. After the right pull rod is threadedly tightened with the screw nut assembly, the screw nut assembly is then threadedly tightened with the left pull rod.

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