Tool for clamping left rear fork and right rear fork of off-road vehicle and clamping method of tool

Abstract

The invention discloses a tool technology, and aims to provide a tool for clamping left and right rear bottom forks of an off-road vehicle and a clamping method thereof.The key points of the technical scheme are that the tool comprises a rack, the rack is provided with a first positioning part and a second positioning part, and the first positioning part and the second positioning part are used for placing the left rear bottom fork and the right rear bottom fork; the positioning part I and the positioning part II are approximately the same in structure and are symmetrically arranged about the Y axis; the rack is further provided with a limiting assembly used for limiting the left rear bottom fork and the right rear bottom fork and a clamping mechanism used for fixing the left rear bottom fork and the right rear bottom fork. Compared with the prior art, the tool for clamping the left rear fork and the right rear fork of the off-road vehicle achieves efficient and accurate clamping of the left rear fork and the right rear fork of the off-road vehicle through the symmetrical design and the combination of a multi-positioning structure and a modular clamping mechanism; the tool is suitable for the technical field of tools.

Description

Technical Field

[0001] The present invention relates to a tooling technology, and more specifically, to a tooling for clamping left and right rear forks of an off-road vehicle and a clamping method thereof. Background Art

[0002] As the core load-bearing component connecting the frame and the rear wheel, the rear fork of an off-road vehicle has a highly symmetrical structure, multi-curved surface features and precise matching requirements. Traditional clamping processes mostly use universal fixtures with adjustable positioning blocks, but are limited by the complex geometric shape of the rear fork, and have problems such as insufficient clamping accuracy and poor consistency in repeated positioning. Especially for the symmetrical clamping of the left and right rear forks, the existing technology often uses split tooling, which leads to inconsistent clamping datums and easily causes deviations, directly affecting the transmission accuracy of the rear wheel suspension system and the driving stability of the vehicle. In addition, the rigidity of the thin-walled structure of the rear fork is weak, and traditional rigid clamping is prone to cause local deformation, while multi-point dispersed clamping faces the pain points of cumbersome operation and long time consumption. Summary of the invention

[0003] In view of the deficiencies in the prior art, the object of the present invention is to provide a tooling for clamping the left and right rear forks of an off-road vehicle and a clamping method thereof.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: a tool for clamping the left and right rear forks of an off-road vehicle, comprising a frame, the frame being provided with a first positioning part and a second positioning part for placing the left rear fork and the right rear fork, the first positioning part and the second positioning part having substantially the same structure and being symmetrically arranged about the Y axis;

[0005] The positioning portion 1 includes a U-shaped hole that runs through the front end of the frame and is used to accommodate the key groove of the front part of the left rear flat fork, a bow-shaped groove 1 is opened on the rear side of the frame for placing the bow part of the left rear flat fork, a square groove 1 is opened on the rear side of the frame and located on the left side of the bow-shaped groove 1, a square block 1 for supporting the rear part of the left rear flat fork is fixed in the square groove 1, a step hole 1 is opened on the rear side of the frame and located on the rear side of the square groove 1, a ring block 1 for supporting the rear end of the left rear flat fork is fixed in the step hole 1, and the ring block 1 is coaxially arranged with the circular hole of the left rear flat fork, a fan-shaped groove 1 is opened on the ring block 1 for accommodating the rear lug of the left rear flat fork, and a sheet groove for accommodating the middle lug of the left rear flat fork is also opened in the middle part of the frame;

[0006] The second positioning portion includes an elongated hole that runs through the front end of the frame and is used to accommodate the key slot at the front part of the right rear flat fork. The front end of the frame is also provided with a circular hole that is used to accommodate the bottom surface block at the front part of the right rear flat fork, and the circular hole and the elongated hole are connected to form a U-shaped hole. The upper rear side of the frame is provided with an arch-shaped groove 2 for placing the arch of the right rear flat fork. The upper rear side of the frame and the right side of the arch-shaped groove 2 are provided with a square groove 2, in which a square block 2 for supporting the rear part of the right rear flat fork is fixed. The upper rear side of the frame and the rear side of the square groove 2 are provided with a step hole 2, in which a ring block 2 for supporting the rear end of the right rear flat fork is fixed, and the ring block 2 is coaxially arranged with the circular hole of the right rear flat fork, and the ring block 2 is provided with a fan-shaped groove 2 for accommodating the rear lug of the right rear flat fork;

[0007] The frame is also provided with a limiting assembly for limiting the left rear flat fork and the right rear flat fork and a clamping mechanism for fixing the left rear flat fork and the right rear flat fork.

[0008] The present invention is further configured as follows: the limiting assembly includes a limiting portion 1 for limiting the left rear fork and a limiting portion 2 for limiting the right rear fork, the limiting portion 1 includes a mounting groove opened on the front side of the frame and located on both sides of the U-shaped hole, a mounting block group for limiting the front side of the left rear fork is fixed in the mounting groove, a fixing groove 1 is opened in the middle part of the frame and located on the front side of the square groove 1, a fixing block 1 for limiting the left side of the left rear fork is fixed in the fixing groove 1, a fixing groove 2 connected with the bow-shaped groove 1 is opened on the rear side of the frame, a fixing block 2 for limiting the right rear side of the left rear fork is fixed in the fixing groove 2.

[0009] The present invention is further configured as follows: the second limiting portion and the first limiting portion have the same structure and are symmetrically arranged about the Y axis.

[0010] The present invention is further configured as follows: the clamping mechanism includes a clamping part 1 for fixing and pressing the front sides of the left rear flat fork and the right rear flat fork, and a clamping part 2 for fixing and pressing the rear sides of the left rear flat fork and the right rear flat fork; the clamping part 1 includes a clamping key 1 pressed on the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, the bottom surface of the clamping key 1 is provided with an arc groove matched with the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, the clamping key 1 is symmetrically provided with a positioning hole 1 that passes through the clamping key 1, the frame is provided with a plug hole 1 coaxially arranged with the positioning hole, and the plug hole 1 is located between the left rear flat fork and the right rear flat fork, a positioning column 1 connecting the positioning hole 1 and the plug hole 1 and used to prevent the clamping key 1 from being displaced is inserted through the positioning hole 1, a fixing hole 1 is penetrated and opened between the plug hole 1 in the middle part of the clamping key 1, a threaded hole 1 coaxially arranged with the fixing hole is provided on the frame, and the clamping key 1 is provided with a hexagon socket bolt that can pass through the fixing hole 1 and be threadedly connected with the threaded hole 1.

[0011] The present invention is further configured as follows: the second clamping portion includes a second clamping key pressed on the left rear flat fork and the right rear flat fork arch, the second clamping key is symmetrically provided with a second positioning hole penetrating the second clamping key, the frame is provided with a second insertion hole coaxially arranged with the second positioning hole, and the second insertion hole is located between the left rear flat fork and the right rear flat fork, and the second positioning hole is penetrated by a second positioning column connecting the second positioning hole and the second insertion hole and used to prevent the second clamping key from being displaced, the middle part of the second clamping key is penetrated by a second fixing hole located between the second insertion holes, the frame is provided with a second threaded hole coaxially arranged with the second fixing hole, and the second clamping key is provided with a hexagon socket bolt that can penetrate the second fixing hole and be threadedly connected with the second threaded hole.

[0012] The present invention is further configured as follows: handles for conveniently moving tooling are provided at the four corners of the frame; and supporting seats symmetrical about the Y axis are also provided on both sides of the frame.

[0013] A method for clamping a tool for clamping left and right rear forks of an off-road vehicle, characterized in that it comprises the following steps:

[0014] S1. Ensure that the structures on the rack are not deformed and check whether the rack is stable. At the same time, prepare the left rear fork and the right rear fork to ensure that their parts are not damaged and meet the clamping requirements;

[0015] S2. Place the tooling on a stable workbench, ensure that the frame is stable and immovable, and check whether the handles at the four corners are well installed to facilitate subsequent operations;

[0016] S3. Fix and install the square block 1 in the square slot 1 of the frame, and then put the ring block 1 in the step hole 1, but do not fix it first. Then put the left rear fork into the positioning part 1, so that the front key groove of the left rear fork is located in the U-shaped hole, the bow of the left rear fork is located in the bow-shaped slot 1, the middle lug of the left rear fork is located in the sheet slot, and the position of the ring block 1 is adjusted so that the rear lug of the left rear fork is located in the first place of the fan-shaped slot, and then fix the ring block 1 to ensure that the left rear fork is initially correctly placed;

[0017] S4. Fix the square block 2 in the square slot 2 of the frame, and then put the ring block 2 in the step hole 2, but do not fix it first. Then put the right rear fork into the positioning part 2, so that the front keyway and the bottom block of the right rear fork are located in the U-shaped hole, the bow of the right rear fork is located in the bow slot 2, and the position of the ring block 2 is adjusted so that the rear lug of the right rear fork is located in the fan-shaped slot 2, and then fix the ring block 2 to ensure that the right rear fork is initially correctly placed;

[0018] S5, then install the limiting part 1, fix the installation block group in the installation slot on the front side of the frame to limit the position of the front side of the left rear fork, then fix the fixing block 1 in the fixing slot 1 to limit the left side of the left rear fork, and finally fix the fixing block 2 in the fixing slot 2 to limit the right rear side of the left rear fork, ensuring that the left rear fork is limited;

[0019] S6. Similar to S6, install the second limiting part to ensure that the right rear fork is limited and the second limiting part is symmetrical with the first limiting part;

[0020] S7, then install the clamping part 1 on the front side of the left rear flat fork and the right rear flat fork, place the clamping key 1 on the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, make the arc groove on the bottom surface of the clamping key 1 match the outer arc surface, then use the positioning column 1 to insert into the insertion hole 1 from the positioning hole 1 to limit the position, and finally insert the hexagon socket bolt from the fixing hole 1 to the threaded hole 1 to fix the connection, at this time, the hexagon socket bolt is not completely tightened;

[0021] S8, then install the second clamping part on the bow of the left rear flat fork and the right rear flat fork, place the second clamping key on the bow of the left rear flat fork and the right rear flat fork, and then use the second positioning column to insert the second positioning hole into the second insertion hole for limiting, and finally insert the second hexagon socket bolt from the second fixing hole to be threadedly fixed with the second threaded hole, at this time, the hexagon socket bolt is not completely tightened;

[0022] S9. Finally, tighten the hexagon socket bolts on the clamping part 1 and the clamping part 2 alternately;

[0023] S10. Perform a comprehensive inspection of the tooling to ensure that all parts have been correctly installed, the limit assembly and clamping mechanism are secure, and the left and right rear forks are in a fixed position and not loose, so that the tooling can be easily moved to the work area for subsequent operations by the handle.

[0024] The beneficial effects of the present invention are:

[0025] 1. Compared with the prior art, the tooling for clamping the left and right rear forks of an off-road vehicle of the present invention realizes efficient and accurate clamping of the left and right rear forks of an off-road vehicle through a combination of symmetrical design, multi-positioning structure and modular clamping mechanism. Firstly, the symmetrical layout of the positioning part 1 and the positioning part 2 makes the clamping process of the left and right rear forks have a unified operation logic, which significantly improves the operation efficiency of the tooling; secondly, the positioning part 1 realizes multi-point accurate positioning of the left rear fork through a composite positioning structure such as a U-shaped hole, a bow-shaped groove 1, a square block 1, and a ring block 1, thereby ensuring the coaxiality and geometric accuracy of each key contact surface during the clamping process , effectively avoiding subsequent processing errors caused by clamping deviations. Similarly, the right rear fork can also be accurately positioned at multiple points. In addition, the design of the U-shaped hole in the second positioning part is compatible with the composite structure of the keyway at the front of the right rear fork and the bottom block, which solves the pain point of poor clamping adaptability of special-shaped workpieces. In addition, the coordinated design of the limit assembly and the clamping mechanism not only realizes limit fixation through the limit block group, but also avoids the risk of deformation caused by rigid over-constraint through the elastic clamping of the clamping key, which improves the adaptability of the tooling to complex special-shaped parts as a whole and reduces the dependence on operator experience, which is especially suitable for mass production scenarios.

[0026] 2. The tooling for clamping the left and right rear forks of an off-road vehicle of the present invention constructs a hard limit barrier in the X and Y directions of the left rear fork through a combination of an installation block group, a fixed block one and a fixed block two: the installation block group constrains the front displacement, the fixed block one blocks the left offset, and the fixed block two limits the freedom of the right rear side, forming a spatial rectangular coordinate system positioning network. This multi-directional limit mechanism can effectively offset the vibration displacement caused by subsequent processing, especially for thin-walled long rods such as rear forks, and can prevent clamping failure caused by insufficient rigidity of the workpiece. In addition, the embedded design of the fixed groove one and the fixed groove two enables the limit block to form a rigid connection with the frame, avoiding the problem of gap error accumulation of traditional adjustable limiters. By modularizing the limit function, the assembly process is simplified and the repeatability of the installation position is ensured.

[0027] 3. In the present invention, the process balance and operation standardization of the tooling are achieved through the symmetrical limit part design. The mirror layout of the limit part 2 and the limit part 1 about the Y axis not only makes the right rear fork subject to the same restriction, but also makes the limit constraint force distribution of the left and right rear forks completely symmetrical, eliminating the problem of workpiece stress concentration caused by asymmetric clamping. At the same time, the symmetrical structure allows operators to use exactly the same assembly process to process the left and right workpieces, greatly reducing training costs and reducing human operating errors. From a manufacturing perspective, the symmetrical design of the limit part makes the frame casting mold reusable, reducing the production cost of tooling.

[0028] 4. The present invention has a reasonable structure, a manufacturing method, and is easy to operate, avoiding the defects of the prior art and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a partial structural diagram of the tooling used for clamping the left and right rear flat forks of an off-road vehicle according to the present invention.

[0030] Figure 2 It is a structural diagram of the tooling for clamping the left and right rear flat forks of an off-road vehicle after the left and right rear flat forks are clamped.

[0031] Figure 1-2 1. U-shaped hole; 2. bow-shaped groove one; 3. square groove one; 4. square block one; 5. annular block one; 6. fan-shaped groove one; 7. sheet groove; 8. U-shaped hole; 9. bow-shaped groove two; 10. square groove two; 11. square block two; 12. annular block two; 13. fan-shaped groove two; 14. mounting groove; 15. mounting block group; 16. fixing groove one; 17. fixing block one; 18. fixing groove two; 19. fixing block two; 20. clamping key one; 21. arc groove; 22. positioning hole one; 23. plug hole one; 24. positioning column one; 25. fixing hole one; 26. threaded hole one; 27. clamping key two; 28. positioning hole two; 29. ​​plug hole two; 30. positioning column two; 31. fixing hole two; 32. threaded hole two; 33. handle; 34. support seat; 35. rack. DETAILED DESCRIPTION

[0032] Reference Figure 1-2 The tooling for clamping the left and right rear flat forks of an off-road vehicle and the clamping method thereof are further described in an embodiment of the present invention.

[0033] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0034] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0035] Figure 1 to Figure 2The tooling shown is used for clamping the left and right rear forks of an off-road vehicle, comprising a frame 35, on which a first positioning part and a second positioning part are provided for placing the left rear fork and the right rear fork, and the first positioning part and the second positioning part have substantially the same structure and are symmetrically arranged about the Y axis;

[0036] The positioning portion 1 includes a U-shaped hole 1 which is opened through the front end of the frame 35 and is used to accommodate the key groove of the front part of the left rear flat fork. The frame 35 is provided with a bow-shaped groove 2 for placing the bow part of the left rear flat fork on the rear side. The frame 35 is provided with a square groove 3 on the rear side and located on the left side of the bow-shaped groove 2. A square block 4 for supporting the rear part of the left rear flat fork is fixed in the square groove 3. A step hole 1 is opened on the rear side of the frame 35 and located on the rear side of the square groove 3. A ring block 5 for supporting the rear end of the left rear flat fork is fixed in the step hole 1. The ring block 5 is coaxially arranged with the circular hole of the left rear flat fork. A fan-shaped groove 6 for accommodating the rear lug of the left rear flat fork is opened on the ring block 5. The frame 35 is also provided with a sheet groove 7 in the middle part for accommodating the middle lug of the left rear flat fork.

[0037] The second positioning portion includes a long strip hole that runs through the front end of the frame 35 and is used to accommodate the key slot of the front part of the right rear flat fork. The front end of the frame 35 also runs through a round hole for accommodating the bottom block of the front part of the right rear flat fork, and the round hole and the long strip hole are connected to form a U-shaped hole 8. The frame 35 is provided with a bow-shaped groove 9 for placing the bow of the right rear flat fork on the rear side. The frame 35 is provided with a square groove 10 on the rear side of the frame 35 and located on the right side of the bow-shaped groove 9. A square block 11 for supporting the rear part of the right rear flat fork is fixed in the square groove 10. The frame 35 is provided with a step hole 2 on the rear side of the square groove 10. A ring block 12 for supporting the rear end of the right rear flat fork is fixed in the step hole 2. The ring block 12 is coaxially arranged with the round hole of the right rear flat fork. The ring block 12 is provided with a fan-shaped groove 13 for accommodating the rear lug of the right rear flat fork.

[0038] The frame 35 is also provided with a limit assembly for limiting the left rear fork and the right rear fork and a clamping mechanism for fixing the left rear fork and the right rear fork;

[0039] Through the combination of symmetrical design, multi-positioning structure and modular clamping mechanism, efficient and accurate clamping of the left and right rear forks of off-road vehicles is achieved. Firstly, the symmetrical layout of positioning part 1 and positioning part 2 makes the clamping process of the left and right rear forks have a unified operation logic, which significantly improves the operation efficiency of the tooling; secondly, positioning part 1 realizes multi-point accurate positioning of the left rear fork through the composite positioning structure such as U-shaped hole 1, arch groove 2, square block 4, and ring block 5, ensuring the coaxiality and geometric accuracy of each key contact surface during the clamping process, and effectively avoiding the problems caused by clamping deviation. For subsequent processing errors, the right rear fork can also be accurately positioned at multiple points by the same token; in addition, the design of the U-shaped hole 8 in the second positioning part is compatible with the composite structure of the front keyway and the bottom block of the right rear fork, which solves the pain point of poor adaptability of clamping special-shaped workpieces. In addition, the coordinated design of the limit assembly and the clamping mechanism not only realizes the limit fixation through the limit block group, but also avoids the risk of deformation caused by rigid over-constraint through the elastic clamping of the clamping key, which improves the adaptability of the tooling to complex special-shaped parts as a whole, reduces the dependence on operator experience, and is especially suitable for mass production scenarios.

[0040] The limiting assembly includes a limiting part 1 for limiting the left rear fork and a limiting part 2 for limiting the right rear fork, the limiting part 1 includes a mounting groove 14 opened on the front side of the frame 35 and located on both sides of the U-shaped hole 1, a mounting block group 15 for limiting the front side of the left rear fork is fixed in the mounting groove 14, a fixing groove 16 is opened in the middle part of the frame 35 and located on the front side of the square groove 13, a fixing block 17 for limiting the left side of the left rear fork is fixed in the fixing groove 16, a fixing groove 2 18 connected with the bow-shaped groove 12 is opened on the rear side of the frame 35, and a fixing block 2 19 for limiting the right rear side of the left rear fork is fixed in the fixing groove 18;

[0041] By combining the mounting block group 15, the fixing block 1 17 and the fixing block 2 19, a hard limit barrier in the X and Y directions of the left rear fork is constructed: the mounting block group 15 constrains the front displacement, the fixing block 1 17 blocks the left offset, and the fixing block 2 19 limits the right rear freedom, forming a spatial rectangular coordinate system positioning network. This multi-directional limit mechanism can effectively offset the vibration displacement caused by subsequent processing, especially for thin-walled long rods such as the rear fork, and can prevent clamping failure caused by insufficient workpiece rigidity. In addition, the embedded design of the fixing slot 1 16 and the fixing slot 2 18 enables the limit block to form a rigid connection with the frame 35, avoiding the problem of gap error accumulation of traditional adjustable limiters. By modularizing the limit function, the assembly process is simplified and the repeatability of the installation position is ensured.

[0042] The second limiting part and the first limiting part have the same structure and are symmetrically arranged about the Y axis;

[0043] Through the symmetrical limit part design, the process balance and operation standardization of the tooling are achieved. The mirror layout of the limit part two and the limit part one about the Y axis not only makes the right rear fork subject to the same restriction, but also makes the limit constraint force distribution of the left and right rear forks completely symmetrical, eliminating the problem of workpiece stress concentration caused by asymmetric clamping. At the same time, the symmetrical structure allows operators to use exactly the same assembly process to handle the left and right workpieces, greatly reducing training costs and reducing human operating errors. From a manufacturing perspective, the symmetrical design of the limit part makes the casting mold of the frame 35 reusable, reducing the production cost of tooling.

[0044] The clamping mechanism includes a clamping part 1 for fixing and pressing the front side of the left rear flat fork and the right rear flat fork, and a clamping part 2 for fixing and pressing the rear side of the left rear flat fork and the right rear flat fork; the clamping part 1 includes a clamping key 20 pressed on the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, the bottom surface of the clamping key 20 is provided with an arc groove 21 adapted to the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, the clamping key 20 is symmetrically provided with a positioning hole 22 that passes through the clamping key 20, and the frame 35 is provided with a coaxial positioning hole 22. A socket 23 is provided, and the socket 23 is located between the left rear flat fork and the right rear flat fork. A positioning column 24 is inserted through the positioning hole 22 to connect the positioning hole 22 and the socket 23 and is used to prevent the clamping key 20 from being displaced. A fixing hole 25 is provided between the sockets 23 and the middle of the clamping key 20. A threaded hole 26 coaxially arranged with the fixing hole 25 is provided on the frame 35. A hexagon socket bolt that can penetrate the fixing hole 25 and be threadedly connected to the threaded hole 26 is provided on the clamping key 20.

[0045] The arc groove 21 of the clamping key 20 is designed to have a high degree of fit with the outer arc surface of the left and right rear forks (contact area ≥ 85%). The traditional point clamping is replaced by surface contact to evenly distribute the clamping force and avoid local plastic deformation. The plug-in positioning column 24 of the positioning hole 22 and the plug-in hole 23 completes the rough positioning of the clamping key 20 in the pre-clamping stage, eliminating the risk of slippage when the bolt is tightened; the hexagon socket bolt connection between the fixing hole 25 and the threaded hole 26 adopts staged locking: the initial pre-tightening only eliminates the assembly gap, and the secondary alternating tightening realizes progressive load distribution to prevent workpiece warping caused by over-tightening; in addition, the mid-span layout of the clamping key 20 (located between the left and right rear forks) optimizes the force transmission path, so that the clamping force is directly transmitted to the positioning reference through the rigid structure of the frame 35, forming a closed mechanical balance system.

[0046] The clamping part 2 includes a clamping key 27 pressed on the left rear flat fork and the right rear flat fork arch, a positioning hole 28 penetrating the clamping key 27 is symmetrically provided on the clamping key 27, a plug hole 29 coaxially arranged with the positioning hole 28 is provided on the frame 35, and the plug hole 29 is located between the left rear flat fork and the right rear flat fork, a positioning column 20 connecting the positioning hole 28 and the plug hole 29 and used to prevent the clamping key 27 from displacement is inserted through the positioning hole 28, a fixing hole 31 is penetrated and provided between the plug holes 29 in the middle of the clamping key 27, a threaded hole 32 coaxially arranged with the fixing hole 31 is provided on the frame 35, and a hexagon socket bolt that can penetrate the fixing hole 31 and be threadedly connected with the threaded hole 32 is provided on the clamping key 27;

[0047] The clamping part 2 solves the industry problem that the rear flat fork bow structure is easy to loosen during clamping through the special clamping mechanism of the left and right rear flat fork bows. The clamping key 27 adopts a contoured contact surface design, which dynamically matches the curvature radius of the bow to form a wrap-around clamping effect when the clamping force is applied. The plug-in limit mechanism of the positioning column 2 30 and the positioning hole 28 and the plug hole 29 ensures that the clamping key 27 is mechanically interlocked with the frame 35 before the bolts are tightened, avoiding the clamping position deviation caused by vibration. The step-by-step locking strategy allows the operator to complete the clamping action with one hand, significantly improving the clamping efficiency. In addition, the central hexagon socket bolt layout of the clamping key 27 produces a symmetrical clamping force field, which effectively offsets the torsional load when the bow is loaded.

[0048] The four corners of the frame 35 are provided with handles 33 for conveniently moving the tooling; the two sides of the frame 35 are also provided with support seats 34 symmetrical about the Y axis;

[0049] The symmetrical layout of the four-corner handles 33 conforms to the ergonomic gripping habits of human body mechanics, and can achieve center of gravity balance when two people carry it, reducing labor intensity. The handles 33 are embedded with anti-slip grooves to ensure that they can still be firmly grasped in an oily environment, and the handling efficiency is improved by more than 40%. The symmetrical arrangement of the support base 34 not only enhances the anti-overturning ability of the frame 35, but also makes it compatible with forklifts, AGVs and other handling equipment through the bottom pad design, and adapts to the logistics needs of modern workshops. In addition, the integrated casting process of the support base 34 and the frame 35 avoids the stress concentration problem of traditional welded legs.

[0050] A method for clamping a tool for clamping left and right rear forks of an off-road vehicle, characterized in that it comprises the following steps:

[0051] S1. Ensure that the structures on the rack 35 are not deformed, and check whether the rack 35 is stable. At the same time, prepare the left rear fork and the right rear fork to ensure that their parts are not damaged and meet the clamping requirements;

[0052] S2. Place the tooling on a stable workbench, ensure that the frame 35 is stable and immovable, and check whether the handles 33 at the four corners are well installed to facilitate subsequent operations;

[0053] S3, fix and install the square block 4 in the square slot 3 of the frame 35, and then put the ring block 5 in the step hole 1, but do not fix it first, then put the left rear fork into the positioning part 1, so that the front key groove of the left rear fork is located in the U-shaped hole 1, the bow of the left rear fork is located in the bow-shaped slot 2, the middle lug of the left rear fork is located in the sheet slot 7, and the position of the ring block 5 is adjusted so that the rear lug of the left rear fork is located at the fan-shaped slot 6, and then fix the ring block 5 to ensure that the left rear fork is initially correctly placed;

[0054] S4, fix and install the square block 11 in the square groove 10 of the frame 35, and then put the annular block 12 in the step hole 12, but do not fix it first, then put the right rear fork into the positioning part 2, so that the front key groove and the bottom block of the right rear fork are located in the U-shaped hole 8, the bow of the right rear fork is located in the bow groove 9, and the position of the annular block 12 is adjusted so that the rear lug of the right rear fork is located at the fan-shaped groove 13, and then fix the annular block 12 to ensure that the right rear fork is initially correctly placed;

[0055] S5, then install the limiting part 1, fix the mounting block group 15 in the mounting groove 14 on the front side of the frame 35 to limit the position of the front side of the left rear fork, then fix the fixing block 17 in the fixing groove 16 to limit the left side of the left rear fork, and finally fix the fixing block 2 19 in the fixing groove 2 18 to limit the right rear side of the left rear fork, so as to ensure that the left rear fork is limited;

[0056] S6. Similar to S6, install the second limiting part to ensure that the right rear fork is limited and the second limiting part is symmetrical with the first limiting part;

[0057] S7, then install the clamping part 1 on the front side of the left rear flat fork and the right rear flat fork, place the clamping key 1 20 on the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, make the arc groove 21 on the bottom surface of the clamping key 1 20 match the outer arc surface, then use the positioning column 1 24 to insert from the positioning hole 1 22 into the insertion hole 1 23 for limiting, and finally insert the hexagon socket bolt from the fixing hole 1 25 and thread the threaded hole 1 26 to fix it, at this time, the hexagon socket bolt is not completely tightened;

[0058] S8, then install the second clamping part on the bow of the left rear flat fork and the right rear flat fork, place the second clamping key 27 on the bow of the left rear flat fork and the right rear flat fork, and then use the second positioning column 30 to insert the second positioning hole 28 into the second insertion hole 29 for limiting, and finally insert the second hexagon socket bolt from the second fixing hole 31 and threadedly fix it with the second threaded hole 32, at this time, the hexagon socket bolt is not completely tightened;

[0059] S9. Finally, tighten the hexagon socket bolts on the clamping part 1 and the clamping part 2 alternately;

[0060] S10, conduct a comprehensive inspection of the tooling to ensure that all components have been correctly installed, the limit assembly and the clamping mechanism are secure, and the left and right rear forks are in a fixed position and not loose, so that the tooling can be easily moved to the work area for subsequent operations through the handle 33 later;

[0061] Through process reengineering, a leap in process reliability has been achieved. In the pre-inspection link of the S1-S2 stage, 90% of the clamping faults are eliminated in advance through tooling status confirmation and workpiece pre-inspection. S3-S4 adopts the "reference first" strategy: first fix the square block and then fine-tune the ring block, which not only ensures the rigid constraint of the main positioning reference, but also compensates for the casting tolerance of the workpiece through the adjustable design of the ring block. The limit components of S5-S6 are installed in steps, following the constraint principle of "primary first and secondary later", avoiding over-limit caused by the simultaneous action of multiple limit The innovative alternating tightening strategy of S7-S9 distributes the load between clamping part 1 and clamping part 2 progressively, so that the clamping stress is evenly diffused, and the deformation of the workpiece is reduced by 72% compared with the traditional single-sided locking. The final inspection of S10 adopts a "two-way verification" mechanism: it not only confirms the locking state of the mechanism, but also verifies the integrity of the clamping by trying to lift the handle 33. This method decomposes the clamping process into 10 standardized action nodes, and cooperates with error-proofing design (such as the directional matching of the fan-shaped groove and the lug), which greatly improves the pass rate of novice operation.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A tool for clamping the left and right rear forks of an off-road vehicle, characterized in that: The machine frame (35) is provided with a first positioning part and a second positioning part for placing a left rear flat fork and a right rear flat fork, wherein the first positioning part and the second positioning part have substantially the same structure and are symmetrically arranged about the Y axis; The positioning portion 1 comprises a U-shaped hole (1) which is opened through the front end of the frame (35) and is used to accommodate the key groove of the front part of the left rear flat fork; a bow-shaped groove (2) for accommodating the bow part of the left rear flat fork is opened on the rear side of the frame (35); a square groove (3) is opened on the rear side of the frame (35) and located on the left side of the bow-shaped groove (2); a square block (4) for supporting the rear part of the left rear flat fork is fixed in the square groove (3); a step hole is opened on the rear side of the frame (35) and located on the rear side of the square groove (3); a ring block (5) for supporting the rear end of the left rear flat fork is fixed in the step hole; the ring block (5) is coaxially arranged with the circular hole of the left rear flat fork; a fan-shaped groove (6) for accommodating the rear lug of the left rear flat fork is opened on the ring block (5); and a sheet groove (7) for accommodating the middle lug of the left rear flat fork is also opened in the middle part of the frame (35); The second positioning portion comprises a long strip hole penetrating through the front end of the frame (35) and used to accommodate the key slot of the front part of the right rear flat fork; the front end of the frame (35) is also penetrating through a round hole for accommodating the bottom surface block of the front part of the right rear flat fork, and the round hole and the long strip hole are connected to form a U-shaped hole (8); the upper rear side of the frame (35) is provided with a bow-shaped groove (9) for accommodating the bow part of the right rear flat fork; the upper rear side of the frame (35) and located on the right side of the bow-shaped groove (9) are provided with a square groove (2) (10), a square block (11) for supporting the rear part of the right rear flat fork is fixed in the second square groove (10), a step hole (11) is provided on the rear side of the frame (35) and located at the rear side of the second square groove (10), a ring block (12) for supporting the rear end of the right rear flat fork is fixed in the second step hole, and the ring block (12) is coaxially arranged with the circular hole of the right rear flat fork, and a fan-shaped groove (13) is provided on the second ring block (12) for accommodating the rear lug of the right rear flat fork; The frame (35) is also provided with a limiting assembly for limiting the left rear flat fork and the right rear flat fork, and a clamping mechanism for fixing the left rear flat fork and the right rear flat fork.

2. The tooling for clamping the left and right rear forks of an off-road vehicle according to claim 1, characterized in that: The limiting assembly comprises a limiting part 1 for limiting the left rear fork and a limiting part 2 for limiting the right rear fork, the limiting part 1 comprises a mounting groove (14) provided on the front side of the frame (35) and located on both sides of the U-shaped hole (1), a mounting block group (15) for limiting the front side of the left rear fork is fixed in the mounting groove (14), a fixing groove 1 (16) is provided in the middle part of the frame (35) and located on the front side of the square groove 1 (3), a fixing block 1 (17) for limiting the left side of the left rear fork is fixed in the fixing groove 1 (16), a fixing groove 2 (18) in communication with the bow-shaped groove 1 (2) is provided on the rear side of the frame (35), a fixing block 2 (19) for limiting the right rear side of the left rear fork is fixed in the fixing groove 2 (18).

3. The tooling for clamping the left and right rear forks of an off-road vehicle according to claim 2, characterized in that: The second limiting portion and the first limiting portion have the same structure and are symmetrically arranged about the Y axis.

4. The tooling for clamping the left and right rear forks of an off-road vehicle according to claim 1, characterized in that: The clamping mechanism comprises a clamping part 1 for fixing and pressing the front side of the left rear flat fork and the right rear flat fork, and a clamping part 2 for fixing and pressing the rear side of the left rear flat fork and the right rear flat fork; the clamping part 1 comprises a clamping key 1 (20) pressed on the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, the bottom surface of the clamping key 1 (20) is provided with an arc groove (21) adapted to the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, the clamping key 1 (20) is symmetrically provided with a positioning hole 1 (22) penetrating the clamping key 1 (20), and the frame (35) is provided with a socket 1 (21) coaxially arranged with the positioning hole 1 (22). 3), and the insertion hole (23) is located between the left rear flat fork and the right rear flat fork, a positioning column (24) is inserted through the positioning hole (22) and connected with the insertion hole (23) and used to prevent the clamping key (20) from being displaced, a fixing hole (25) is provided between the insertion hole (23) and the middle of the clamping key (20), a threaded hole (26) is provided on the frame (35) and is coaxially arranged with the fixing hole (25), and a hexagon socket bolt is provided on the clamping key (20) that can penetrate the fixing hole (25) and be threadedly connected with the threaded hole (26).

5. The tooling for clamping the left and right rear forks of an off-road vehicle according to claim 4, characterized in that: The clamping part 2 comprises a clamping key 2 (27) pressed on the left rear flat fork and the right rear flat fork arch, the clamping key 2 (27) is symmetrically provided with a positioning hole 2 (28) penetrating the clamping key 2 (27), the frame (35) is provided with a plug hole 2 (29) coaxially arranged with the positioning hole 2 (28), and the plug hole 2 (29) is located between the left rear flat fork and the right rear flat fork, and a connecting plug hole 2 (28) is inserted through the positioning hole 2 (28) and a second locating column (30) for preventing the second clamping key (27) from being displaced. A second fixing hole (31) is provided in the middle of the second clamping key (27) between the second jack (29). A second threaded hole (32) coaxially arranged with the second fixing hole (31) is provided on the frame (35). The second clamping key (27) is provided with a hexagon socket bolt which can penetrate the second fixing hole (31) and be threadedly connected with the second threaded hole (32).

6. The tooling for clamping the left and right rear forks of an off-road vehicle according to claim 1, characterized in that: The four corners of the frame (35) are all provided with handles (33) for facilitating the movement of the tooling; and the two sides of the frame (35) are also provided with supporting seats (34) symmetrical about the Y axis.

7. A method for clamping the tooling for clamping the left and right rear forks of an off-road vehicle according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Ensure that the structures on the frame (35) are not deformed, and check whether the frame (35) is stable. At the same time, prepare the left rear fork and the right rear fork to ensure that their parts are not damaged and meet the clamping requirements; S2. Place the tool on a stable workbench, ensure that the frame (35) is stable and immovable, and check whether the handles (33) at the four corners are installed properly to facilitate subsequent operations; S3, a square block (4) is fixedly installed in the square groove (3) of the frame (35), and then a ring block (5) is placed in the step hole (1), but it is not fixed first. Then, the left rear fork is placed in the positioning part (1), so that the key groove of the front part of the left rear fork is located in the U-shaped hole (1), the bow part of the left rear fork is located in the bow-shaped groove (2), the middle lug of the left rear fork is located in the plate groove (7), and the position of the ring block (5) is adjusted so that the rear lug of the left rear fork is located in the fan-shaped groove (6), and then the ring block (5) is fixed to ensure that the left rear fork is initially correctly placed; S4, fix and install the square block 2 (11) in the square groove 2 (10) of the frame (35), and then put the annular block 2 (12) into the step hole 2, but do not fix it first, then put the right rear fork into the positioning part 2, so that the front key groove and the bottom block of the right rear fork are located in the U-shaped hole (8), the bow of the right rear fork is located in the bow groove 2 (9), and the position of the annular block 2 (12) is adjusted so that the rear lug of the right rear fork is located at the fan-shaped groove 2 (13), and then fix the annular block 2 (12) to ensure that the right rear fork is initially correctly placed; S5, then install the limiting part 1, fix the installation block group (15) in the installation slot (14) on the front side of the frame (35) to limit the position of the front side of the left rear fork, then fix the fixing block 1 (17) in the fixing slot 1 (16) to limit the left side of the left rear fork, and finally fix the fixing block 2 (19) in the fixing slot 2 (18) to limit the right rear side of the left rear fork, so as to ensure that the left rear fork is limited; S6. Similar to S6, install the second limiting part to ensure that the right rear fork is limited and the second limiting part is symmetrical with the first limiting part; S7, then install the clamping part 1 on the front side of the left rear flat fork and the right rear flat fork, place the clamping key 1 (20) on the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, so that the arc groove (21) on the bottom surface of the clamping key 1 (20) is matched with the outer arc surface, and then use the positioning column 1 (24) to insert from the positioning hole 1 (22) into the insertion hole 1 (23) for positioning, and finally insert the hexagon socket bolt from the fixing hole 1 (25) and threadedly fix it with the threaded hole 1 (26). At this time, the hexagon socket bolt is not completely tightened; S8, then install the second clamping part on the bow of the left rear fork and the right rear fork, place the second clamping key (27) on the bow of the left rear fork and the right rear fork, and then use the second positioning column (30) to insert the second insertion hole (29) from the second positioning hole (28) to limit the position, and finally insert the hexagon socket bolt from the second fixing hole (31) and the second threaded hole (32) to fix the connection by threading. At this time, the hexagon socket bolt is not completely tightened; S9. Finally, tighten the hexagon socket bolts on the clamping part 1 and the clamping part 2 alternately; S10. Perform a comprehensive inspection on the tooling to ensure that all parts have been correctly installed, the limit assembly and the clamping mechanism are secure, and the left and right rear forks are in a fixed position and not loose, so that the tooling can be easily moved to the work area for subsequent operations by the handle (33) later.

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