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

Abstract

The application discloses a tooling technology, and aims to provide a tooling for clamping left and right rear fork of an off-road vehicle and a clamping method thereof, and the technical scheme is as follows: a rack is arranged on the tooling, and a positioning part one and a positioning part two for placing left and right rear fork are arranged on the rack, the positioning part one and the positioning part two are substantially the same in structure and are symmetrically arranged about the Y axis; a limiting assembly for limiting the left and right rear fork and a clamping mechanism for fixing the left and right rear fork are further arranged on the rack; compared with the prior art, the tooling for clamping the left and right rear fork of the off-road vehicle is combined with the symmetric design, the multiple positioning structures and the modular clamping mechanism, so that the efficient and accurate clamping of the left and right rear fork of the off-road vehicle is realized; and the application is suitable for the tooling technical field.

Description

TECHNICAL FIELD

[0001] The present application relates to a tooling technology, more particularly, it relates to a tooling for clamping left and right rear fork of off-road vehicle and a clamping method thereof. BACKGROUND

[0002] As a core load-bearing component connecting frame and rear wheel, the rear fork of off-road vehicle has high symmetry, multi-surface characteristics and precise fitting requirements. The traditional clamping process mostly uses general fixtures with adjustable positioning blocks, but due to the complex geometry of the rear fork, there are problems such as insufficient clamping accuracy and poor consistency of repeated positioning. Especially for the symmetrical clamping of left and right rear fork, the existing technology often uses split tooling, which leads to non-uniform clamping reference, easy to cause deviation, directly affecting the transmission accuracy of rear wheel suspension system and the driving stability of the whole vehicle. In addition, the rear fork has a weak rigid structure, and traditional rigid clamping is easy to cause local deformation, while multi-point dispersed clamping also faces the pain points of complicated operation and long time consumption. SUMMARY

[0003] In view of the deficiencies of the prior art, the purpose of the present application is to provide a tooling for clamping left and right rear fork of off-road vehicle and a clamping method thereof.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a tooling for clamping left and right rear fork of off-road vehicle, comprising a rack, the rack is provided with a positioning part one and a positioning part two for placing left and right rear fork, the positioning part one and the positioning part two are substantially the same structure and are symmetrically arranged about the Y axis;

[0005] The positioning part one comprises a U-shaped hole passing through the front end of the rack and used for accommodating the front key groove of the left rear fork, a bow-shaped groove one is arranged on the upper rear side of the rack for placing the bow part of the left rear fork, a square groove one is arranged on the upper rear side of the rack and located on the left side of the bow-shaped groove one, a square block one for supporting the rear part of the left rear fork is fixed in the square groove one, a stepped hole one is arranged on the upper rear side of the rack and located on the rear side of the square groove one, a ring-shaped block one for supporting the rear end of the left rear fork is fixed in the stepped hole one, and the ring-shaped block one is coaxially arranged with the circular hole of the left rear fork, a fan-shaped groove one for accommodating the rear lug of the left rear fork is arranged on the ring-shaped block one, and a sheet groove for accommodating the middle lug of the left rear fork is further arranged on the middle part of the rack;

[0006] The positioning part two comprises a long strip-shaped hole through which a front key groove of the right rear flat fork is arranged, and a circular hole through which a front bottom clamping block of the right rear flat fork is arranged, and the circular hole and the long strip-shaped hole are communicated to form a U-shaped hole; an arch-shaped groove two is arranged on the upper rear side of the frame for placing an arch part of the right rear flat fork; a square groove two is arranged on the upper rear side of the frame and located on the right side of the arch-shaped groove two; a square block two is fixed in the square groove two for supporting the rear part of the right rear flat fork; a stepped hole two is arranged on the upper rear side of the frame and located on the rear side of the square groove two; and an annular block two is fixed in the stepped hole two for supporting the rear end of the right rear flat fork, and the annular block two is coaxially arranged with the circular hole of the right rear flat fork, and a fan-shaped groove two is arranged on the annular block two for accommodating a rear lug of the right rear flat fork.

[0007] The frame is further 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 limiting assembly comprises a limiting part one for limiting the left rear flat fork and a limiting part two for limiting the right rear flat fork; the limiting part one comprises a mounting groove arranged on the upper front side of the frame and located on both sides of the U-shaped hole; a mounting block group is fixed in the mounting groove for limiting the front side of the left rear flat fork; a fixed groove one is arranged on the upper middle part of the frame and located on the front side of the square groove one; a fixed block one is fixed in the fixed groove one for limiting the left side of the left rear flat fork; and a fixed groove two is arranged on the upper rear side of the frame and communicated with the arch-shaped groove one; and a fixed block two is fixed in the fixed groove two for limiting the right rear side of the left rear flat fork.

[0009] The limiting part two and the limiting part one are the same in structure and are symmetrically arranged about the Y-axis.

[0010] The clamping mechanism comprises a clamping part one for fixing and pressing the front side of the left rear flat fork and the right rear flat fork, and a clamping part two for fixing and pressing the rear side of the left rear flat fork and the right rear flat fork; the clamping part one comprises a pressing key one arranged on the outer arc surface of the front side of the left rear flat fork and the right rear flat fork; an arc-shaped groove is arranged on the bottom surface of the pressing key one and matched with the outer arc surface of the front side of the left rear flat fork and the right rear flat fork; a positioning hole one is symmetrically arranged on the pressing key one and penetrates the pressing key one; an insertion hole one is coaxially arranged with the positioning hole one on the frame and located between the left rear flat fork and the right rear flat fork; a positioning column one is inserted into the positioning hole one and connected with the positioning hole one and the insertion hole one and used for preventing displacement of the pressing key one; a fixed hole one is arranged in the middle part of the pressing key one and penetrates the insertion hole one; a threaded hole one is coaxially arranged with the fixed hole one on the frame; and an inner hexagonal bolt is arranged on the pressing key one and can penetrate the fixed hole one and be screwed with the threaded hole one.

[0011] The invention is further provided with: the two clamping parts comprise two pressing keys arranged on the arches of the left and right rear dropouts, two positioning holes are symmetrically arranged on the two pressing keys and penetrate the two pressing keys, two insertion holes are coaxially arranged on the frame and are located between the left and right rear dropouts, two positioning columns are inserted into the two positioning holes and the two insertion holes and are used for preventing displacement of the two pressing keys, two fixing holes are arranged in the middle of the two pressing keys and penetrate the two insertion holes, two threaded holes are coaxially arranged on the frame and are located between the two insertion holes, and two inner hexagonal bolts are arranged on the two pressing keys and can penetrate the two fixing holes and are in threaded connection with the two threaded holes.

[0012] The invention is further provided with: four corners of the frame are provided with handles for facilitating movement of the tool; and the frame is provided with support seats symmetric about the Y axis.

[0013] A clamping method of a tool for clamping left and right rear dropouts of an off-road vehicle, comprising the following steps:

[0014] S1, ensure that no deformation occurs in each structure on the frame, check whether the frame is stable, prepare the left and right rear dropouts, and ensure that each part of the left and right rear dropouts is not damaged and meets the clamping requirements;

[0015] S2, place the tool on a stable workbench, ensure that the frame is stable and immovable, and check whether the handles at four corners are installed perfectly to facilitate subsequent operation;

[0016] S3, fix a square block one in the square groove one of the frame, then put a ring block one into the stepped hole one without fixing it, then put the left rear dropout into the positioning part one, so that the front key groove of the left rear dropout is located in the U-shaped hole, the arch of the left rear dropout is located in the arch-shaped groove one, the middle lug of the left rear dropout is located in the piece groove, the position of the ring block one is adjusted so that the rear lug of the left rear dropout is located in the sector-shaped groove one, and then the ring block one is fixed to ensure that the left rear dropout is initially and correctly placed;

[0017] S4, fix a square block two in the square groove two of the frame, then put a ring block two into the stepped hole two without fixing it, then put the right rear dropout into the positioning part two, so that the front key groove and the bottom clamping block of the right rear dropout are located in the U-shaped hole, the arch of the right rear dropout is located in the arch-shaped groove two, the position of the ring block two is adjusted so that the rear lug of the right rear dropout is located in the sector-shaped groove two, and then the ring block two is fixed to ensure that the right rear dropout is initially and correctly placed;

[0018] S5, then the installation limiting part one, in the installation groove of the front side of the rack, the installation block group is fixedly installed, so as to limit the position of the front side of the left rear fork, then the fixed block one is fixedly installed in the fixed groove one, so as to limit the left side of the left rear fork, finally, the fixed block two is fixedly installed in the fixed groove two, so as to limit the right rear side of the left rear fork, and the left rear fork is limited;

[0019] S6, similar to S5, the installation limiting part two is installed, the right rear fork is limited, and the limiting part two is symmetrical with the limiting part one;

[0020] S7, then the clamping part one is installed on the front side of the left rear fork and the right rear fork, the pressing key one is placed on the outer arc surface of the front side of the left rear fork and the right rear fork, the arc-shaped groove on the bottom surface of the pressing key one is matched with the outer arc surface, then the positioning column one is inserted into the insertion hole one from the positioning hole one for limiting, finally, the internal hexagonal screw is inserted into the fixed hole one and screw-fixedly connected with the threaded hole one, at this time, the internal hexagonal screw is not completely tightened;

[0021] S8, then the clamping part two is installed on the bow of the left rear fork and the right rear fork, the pressing key two is placed on the bow of the left rear fork and the right rear fork, then the positioning column two is inserted into the insertion hole two from the positioning hole two for limiting, finally, the internal hexagonal screw is inserted into the fixed hole two and screw-fixedly connected with the threaded hole two, at this time, the internal hexagonal screw is not completely tightened;

[0022] S9, finally, the internal hexagonal screws on the pressing part one and the pressing part two are alternately tightened.

[0023] S10, the tooling is comprehensively checked, it is ensured that all components have been correctly installed, the limiting assembly and the clamping mechanism are firm, the left and right rear forks are in the fixed position, and there is no looseness, so that the tooling can be easily moved to the working area to be operated later through the handle.

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

[0025] 1. Compared with the prior art, the tool for clamping the left and right rear fork of an off-road vehicle realizes efficient and accurate clamping of the left and right rear fork of the off-road vehicle through the combination of symmetrical design, multi-positioning structure and modular clamping mechanism. Firstly, the symmetrical layout of the positioning part one and the positioning part two makes the clamping process of the left and right rear fork have a unified operation logic, significantly improving the operation efficiency of the tool. Secondly, the positioning part one realizes multi-point accurate positioning of the left rear fork through the composite positioning structure of the U-shaped hole, the bow-shaped groove one, the square block one and the annular block one, ensuring the coaxiality and geometric accuracy of each key contact surface during the clamping process, effectively avoiding subsequent machining errors caused by clamping deviation. Similarly, multi-point accurate positioning of the right rear fork is also achieved. In addition, the design of the U-shaped hole in the positioning part two can accommodate the composite structure of the front key groove and the bottom surface clamping block of the right rear fork, solving the pain point of poor adaptability of special-shaped workpieces during clamping. Furthermore, the cooperative design of the limiting assembly and the clamping mechanism not only realizes limiting fixation through the limiting block group, but also avoids the risk of deformation caused by rigid over-constraint through the elastic clamping of the pressing key, thereby improving the adaptability of the tool to complex special-shaped parts and reducing the dependence on the experience of operators, especially in batch production scenarios.

[0026] 2. The tool for clamping the left and right rear fork of an off-road vehicle constructs the hard limiting barrier of the left rear fork in X and Y directions through the combination of the mounting block group, the fixed block one and the fixed block two: the mounting block group restricts the front side displacement, the fixed block one blocks the left side deviation, and the fixed block two limits the right rear side degree of freedom, forming a positioning network in the form of spatial orthogonal coordinates. This multi-directional limiting mechanism can effectively offset the vibration displacement caused by subsequent machining process, especially for thin-walled long rod parts such as rear fork, which 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 makes the limiting block form a rigid connection with the rack, avoiding the gap error accumulation problem of traditional adjustable limiters. By modularizing the limiting function, the assembly process is simplified, and the repeatability of the installation position is ensured.

[0027] 3. In the present application, the symmetrical limiting part design realizes the process balance and operation standardization of the tool. The mirror image layout of the limiting part two and the limiting part one about the Y axis not only makes the right rear fork get the same limitation, but also makes the limiting constraint force distribution of the left and right rear fork completely symmetrical, eliminating the workpiece stress concentration problem caused by asymmetric clamping. At the same time, the symmetrical structure allows operators to use the same assembly process to handle left and right workpieces, significantly reducing training costs and reducing human operation errors. From the perspective of manufacturing, the symmetrical design of the limiting part allows the rack casting mold to be reused, reducing the production cost of the tool.

[0028] 4. The present application has reasonable structure, simple manufacturing method and operation, avoids the defects in the prior art, and is suitable for popularization and implementation. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 Part structure diagram of the tool for clamping the left and right rear fork of the off-road vehicle of the present application.

[0030] Fig. 2 Structure diagram of the tool for clamping the left and right rear fork of the off-road vehicle of the present application after clamping the left and right rear fork.

[0031] Figs. 1-2 Reference signs: 1, U-shaped hole; 2, arc-shaped slot 1; 3, square slot 1; 4, square block 1; 5, ring-shaped block 1; 6, fan-shaped slot 1; 7, piece slot; 8, U-shaped hole; 9, arc-shaped slot 2; 10, square slot 2; 11, square block 2; 12, ring-shaped block 2; 13, fan-shaped slot 2; 14, mounting slot; 15, mounting block group; 16, fixed slot 1; 17, fixed block 1; 18, fixed slot 2; 19, fixed block 2; 20, pressing key 1; 21, arc-shaped slot; 22, positioning hole 1; 23, insertion hole 1; 24, positioning column 1; 25, fixed hole 1; 26, threaded hole 1; 27, pressing key 2; 28, positioning hole 2; 29, insertion hole 2; 30, positioning column 2; 31, fixed hole 2; 32, threaded hole 2; 33, handle; 34, support seat; 35, rack. DETAILED DESCRIPTION

[0032] REFERENCE Figs. 1-2 Further description is made to the tool for clamping the left and right rear fork of the off-road vehicle of the present application and the clamping method thereof.

[0033] For ease of description, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to describe one element or feature's relationship to another element or feature as illustrated in the drawings. It should be understood that the spatial terms are intended to encompass different orientations of the device in use or operation, except where the context explicitly dictates otherwise. For example, if the device in the drawings is turned over, an element described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0034] Moreover, relative terms such as "first" and "second" are used merely to distinguish one component from another, without necessarily requiring or implying any actual relationship or order between or among the components.

[0035] Figs. 1-2The tool for clamping left and right rear fork of off-road vehicle comprises a frame 35, the frame 35 is provided with positioning part one and positioning part two for placing left and right rear fork, the positioning part one and the positioning part two are roughly the same structure and symmetrically arranged about Y axis;

[0036] The positioning part one comprises U-shaped hole 1 through the front end of the frame 35 for accommodating the front key groove of the left rear fork, the frame 35 is provided with arch-shaped groove one 2 on the rear side for placing the arch part of the left rear fork, the frame 35 is provided with square groove one 3 on the rear side and left side of the arch-shaped groove one 2, the square groove one 3 is fixed with square block one 4 for supporting the rear part of the left rear fork, the frame 35 is provided with step hole one on the rear side and rear side of the square groove one 3, the step hole one is fixed with annular block one 5 for supporting the rear end of the left rear fork, and the annular block one 5 is coaxially arranged with the circular hole of the left rear fork, the annular block one 5 is provided with fan-shaped groove one 6 for accommodating the rear lug of the left rear fork, and the frame 35 is further provided with sheet groove 7 on the middle part for accommodating the middle lug of the left rear fork;

[0037] The positioning part two comprises long strip-shaped hole through the front end of the frame 35 for accommodating the front key groove of the right rear fork, the frame 35 is further provided with circular hole through the front end for accommodating the front bottom surface clamping block of the right rear fork, and the circular hole and the long strip-shaped hole are communicated to form U-shaped hole 8, the frame 35 is provided with arch-shaped groove two 9 on the rear side for placing the arch part of the right rear fork, the frame 35 is provided with square groove two 10 on the rear side and right side of the arch-shaped groove two 9, the square groove two 10 is fixed with square block two 11 for supporting the rear part of the right rear fork, the frame 35 is provided with step hole two on the rear side and rear side of the square groove two 10, the step hole two is fixed with annular block two 12 for supporting the rear end of the right rear fork, and the annular block two 12 is coaxially arranged with the circular hole of the right rear fork, the annular block two 12 is provided with fan-shaped groove two 13 for accommodating the rear lug of the right rear fork;

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

[0039] By the combination of symmetrical design, multi-positioning structure and modular clamping mechanism, efficient and accurate clamping of the left and right rear fork of the off-road vehicle is realized. Firstly, the symmetrical layout of the positioning part one and the positioning part two makes the clamping process of the left and right rear fork have a unified operation logic, which significantly improves the operation efficiency of the tooling. Secondly, the positioning part one realizes multi-point accurate positioning of the left rear fork through the composite positioning structure of the U-shaped hole 1, the bow-shaped groove 1, the square block 1, the ring-shaped block 1, etc., ensuring the coaxiality and geometric accuracy of each key contact surface during the clamping process, effectively avoiding the subsequent machining errors caused by clamping deviation. Similarly, multi-point accurate positioning of the right rear fork is also achieved. In addition, the design of the U-shaped hole 8 in the positioning part two can accommodate the composite structure of the front key groove and the bottom surface clamping block of the right rear fork, solving the pain point of poor adaptability of special-shaped workpiece clamping. Furthermore, the cooperative design of the limiting assembly and the clamping mechanism not only realizes limiting and fixing through the limiting block group, but also avoids the deformation risk caused by rigid over-constraint through the elastic clamping of the pressing key, which improves the adaptability of the tooling to complex special-shaped parts and reduces the dependence on the experience of the operator, especially suitable for batch production scenes.

[0040] The limiting assembly includes a limiting part one for limiting the left rear fork and a limiting part two for limiting the right rear fork. The limiting part one includes an installation groove 14 opened on the front side of the rack 35 and located on both sides of the U-shaped hole 1. The installation groove 14 is fixed with an installation block group 15 for limiting the front side of the left rear fork. A fixed groove one 16 is opened on the middle part of the rack 35 and located on the front side of the square groove one 3. The fixed groove one 16 is fixed with a fixed block one 17 for limiting the left side of the left rear fork. A fixed groove two 18 is opened on the rear side of the rack 35 and communicates with the bow-shaped groove one 2. The fixed groove two 18 is fixed with a fixed block two 19 for limiting the right rear side of the left rear fork.

[0041] Through the combination of the installation block group 15, the fixed block one 17 and the fixed block two 19, a hard limiting barrier in X and Y directions of the left rear fork is constructed. The installation block group 15 restricts the front side displacement, the fixed block one 17 blocks the left side deviation, and the fixed block two 19 limits the right rear side freedom, forming a positioning network of spatial rectangular coordinate system. This multi-directional limiting mechanism can effectively offset the vibration displacement caused by subsequent machining process, especially for thin-walled long rod parts such as rear fork, which can prevent clamping failure caused by insufficient rigidity of the workpiece. In addition, the embedded design of the fixed groove one 16 and the fixed groove two 18 makes the limiting block and the rack 35 form a rigid connection, avoiding the gap error accumulation problem of traditional adjustable limiters. By modularizing the limiting function, the assembly process is simplified, and the repeatability of the installation position is ensured.

[0042] The limiting part two and the limiting part one are the same structure and are symmetrically arranged about the Y axis.

[0043] Through the design of symmetrical limiting parts, process balance and operation standardization of the tooling are realized. The mirror image layout of limiting part two and limiting part one about the Y axis not only makes the right rear fork get the same restriction, but also makes the limiting constraint force distribution of the left and right rear forks completely symmetrical, eliminating the workpiece stress concentration problem caused by asymmetric clamping. At the same time, the symmetrical structure allows the operator to use the same assembly process to handle the left and right workpieces, greatly reducing the training cost and reducing human operation errors. From the manufacturing point of view, the symmetrical design of the limiting part makes the rack 35 casting mold reusable, reducing the tooling production cost.

[0044] The clamping mechanism includes a clamping part one for fixing and pressing the front side of the left and right rear forks and a clamping part two for fixing and pressing the rear side of the left and right rear forks; the clamping part one includes a pressing key one 20 arranged on the outer arc surface of the front side of the left and right rear forks, the bottom surface of the pressing key one 20 is provided with an arc-shaped groove 21 matched with the outer arc surface of the front side of the left and right rear forks, a positioning hole one 22 is symmetrically arranged on the pressing key one 20 and penetrates the pressing key one 20, an insertion hole one 23 coaxially arranged with the positioning hole one 22 is arranged on the rack 35, and the insertion hole one 23 is located between the left and right rear forks, a positioning column one 24 is inserted and arranged in the positioning hole one 22 and connects the positioning hole one 22 and the insertion hole one 23 and is used for preventing displacement of the pressing key one 20, a fixing hole one 25 is arranged in the middle of the pressing key one 20 and penetrates the insertion hole one 23, a threaded hole one 26 coaxially arranged with the fixing hole one 25 is arranged on the rack 35, and an inner hexagonal bolt is arranged on the pressing key one 20 and can penetrate the fixing hole one 25 and be threadedly connected with the threaded hole one 26;

[0045] The high degree of matching (contact area ≥ 85%) of the arc-shaped groove 21 of the pressing key one 20 and the outer arc surface of the left and right rear forks is designed, the face contact is used to replace the traditional point clamping, the clamping force is uniformly distributed, local plastic deformation is avoided, the insertion type positioning column one 24 of the positioning hole one 22 and the insertion hole one 23 is designed, the coarse positioning of the pressing key one 20 is completed in the pre-clamping stage, and the slip risk during bolt fastening is eliminated; the inner hexagonal bolt connection of the fixing hole one 25 and the threaded hole one 26 adopts staged locking: the initial pre-tightening only eliminates the assembly gap, the secondary alternate tightening realizes progressive load distribution, and prevents workpiece warping caused by over-tightening; in addition, the cross layout (between the left and right rear forks) of the pressing key one 20 optimizes the force transmission path, so that the clamping force is directly transmitted to the positioning reference through the rigid structure of the rack 35, forming a closed mechanical balance system.

[0046] The clamping part two comprises two pressing keys 27 arranged on the arches of the left and right rear flat forks, the two pressing keys 27 are symmetrically provided with two positioning holes 28 penetrating the two pressing keys 27, the rack 35 is provided with two insertion holes 29 coaxially arranged with the two positioning holes 28, the two insertion holes 29 are located between the left and right rear flat forks, the two positioning holes 28 are penetrated and arranged with two positioning columns 30 connecting the two positioning holes 28 and the two insertion holes 29 and used for preventing the two pressing keys 27 from being displaced, the two pressing keys 27 are provided with two fixing holes 31 penetrating the middle portions of the two pressing keys 27 and located between the two insertion holes 29, the rack 35 is provided with two threaded holes 32 coaxially arranged with the two fixing holes 31, and the two pressing keys 27 are provided with two inner hexagonal bolts penetrating the two fixing holes 31 and threadedly connected with the two threaded holes 32;

[0047] The clamping part two solves the industry problem that the rear flat fork arch structure is prone to loosening through the special pressing mechanism of the left and right rear flat fork arches, the two pressing keys 27 are designed with a profiled contact surface and dynamically matched with the curvature radius of the arch, and a wrapping clamping effect is formed when the clamping force is applied, the insertion limiting mechanism of the two positioning columns 30 and the two positioning holes 28 and the two insertion holes 29 ensures that the two pressing keys 27 are mechanically interlocked with the rack 35 before being locked by the bolts, the displacement of the clamping position caused by vibration is avoided, the step-by-step locking strategy enables an operator to complete the clamping action with one hand, and the clamping efficiency is significantly improved; in addition, the symmetrical clamping force field generated by the centrally arranged inner hexagonal bolts of the two pressing keys 27 effectively offsets the torsional load of the arch when the arch is subjected to a load.

[0048] The four corner positions of the rack 35 are provided with handles 33 for conveniently moving the tool;

[0049] The symmetrical layout of the four corner handles 33 conforms to the human mechanics gripping habit, the center of gravity can be balanced when two people carry the tool, and the labor intensity is reduced, the handles 33 are designed with embedded anti-skid patterns to ensure that the handles 33 can still be firmly gripped in an oily environment, and the carrying efficiency is improved by more than 40%, the symmetrical arrangement of the supporting seats 34 not only enhances the anti-overturning capability of the rack 35, but also is compatible with various carrying equipment such as forklifts and AGVs through the bottom surface heightening design, and meets the logistics demand of modern workshops, in addition, the integrated casting process of the supporting seats 34 and the rack 35 avoids the stress concentration problem of the traditional welded legs.

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

[0051] S1, ensure that all structures on the rack 35 are not deformed, check whether the rack 35 is stable, prepare the left and right rear flat forks, and ensure that all parts of the left and right rear flat forks are not damaged and meet the clamping requirements;

[0052] S2, place the tool on a stable workbench, ensure that the rack 35 is stable and immovable, and check whether the handles 33 at the four corners are installed perfectly to facilitate subsequent operation;

[0053] S3, fix the square block one 4 in the square slot one 3 of the rack 35, then put the annular block one 5 into the stepped hole one, but do not fix it yet, then put the left rear flat fork into the positioning part one, so that the front key groove of the left rear flat fork is located in the U-shaped hole 1, the arch part of the left rear flat fork is located in the arch-shaped slot one 2, the middle lug of the left rear flat fork is located in the sheet slot 7, and the position of the annular block one 5 is adjusted so that the rear lug of the left rear flat fork is located at the sector-shaped slot one 6, then fix the annular block one 5, and ensure that the left rear flat fork is preliminarily and correctly placed;

[0054] S4, fix the square block two 11 in the square slot two 10 of the rack 35, then put the annular block two 12 into the stepped hole two, but do not fix it yet, then put the right rear flat fork into the positioning part two, so that the front key groove and the bottom block of the right rear flat fork are located in the U-shaped hole 8, the arch part of the right rear flat fork is located in the arch-shaped slot two 9, and the position of the annular block two 12 is adjusted so that the rear lug of the right rear flat fork is located at the sector-shaped slot two 13, then fix the annular block two 12, and ensure that the right rear flat fork is preliminarily and correctly placed;

[0055] S5, then install the limiting part one, fix the installation block group 15 in the installation slot 14 on the front side of the rack 35 to limit the position of the front side of the left rear flat fork, then fix the fixed block one 17 in the fixed slot one 16 to limit the left side of the left rear flat fork, and finally fix the fixed block two 19 in the fixed slot two 18 to limit the right rear side of the left rear flat fork, so as to limit the left rear flat fork;

[0056] S6, similar to S5, install the limiting part two, so as to limit the right rear flat fork and ensure that the limiting part two is symmetrical with the limiting part one;

[0057] S7, then install the clamping part one on the front side of the left rear flat fork and the right rear flat fork, place the pressing key one 20 at the outer arc surface of the front side of the left rear flat fork and the right rear flat fork, so that the arc-shaped slot 21 on the bottom surface of the pressing key one 20 is matched with the outer arc surface, then use the positioning column one 24 to insert into the insertion hole one 23 from the positioning hole one 22 for limiting, and finally use the internal hexagonal bolt to insert into the fixed hole one 25 and be screwedly connected with the threaded hole one 26, at this time, the internal hexagonal bolt is not completely tightened;

[0058] S8, then install the clamping part two on the arch part of the left rear flat fork and the right rear flat fork, place the pressing key two 27 on the arch part of the left rear flat fork and the right rear flat fork, then use the positioning column two 30 to insert into the insertion hole two 29 from the positioning hole two 28 for limiting, and finally use the internal hexagonal bolt to insert into the fixed hole two 31 and be screwedly connected with the threaded hole two 32, at this time, the internal hexagonal bolt is not completely tightened;

[0059] S9, finally, the hexagonal bolts on the compression part one and the compression part two are alternately tightened;

[0060] S10, the tool is comprehensively checked to ensure that all parts have been correctly installed, the limiting assembly, the clamping mechanism are firm, the left and right rear fork is in a fixed position, and there is no looseness, which is convenient for the tool to be easily moved to the working area to be operated later by the handle 33;

[0061] Through process reengineering, the process reliability has been greatly improved. The pre-check link in S1-S2 stage, through the tool state confirmation and workpiece pre-check, pre-excludes 90% of clamping faults. 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 limiting assembly in S5-S6 is installed step by step, following the constraint principle of "main first and then next", avoiding over-constraint caused by multi-directional limiting at the same time. The innovative alternating tightening strategy in S7-S9 gradually distributes the load of the clamping part one and the clamping part two, making the clamping stress evenly diffuse, and the workpiece deformation is reduced by 72% compared with the traditional single-sided locking. The final inspection link in S10 adopts the "two-way verification" mechanism: confirming the locking state of the mechanism, and verifying the overall clamping through the handle 33, which divides the clamping process into 10 standardized action nodes, and cooperates with the mistake-proof design (such as the directional matching of the fan-shaped groove and the lug), so that the operation qualification rate of new workers is greatly improved.

[0062] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make usual changes and replacements within the technical scheme of the present application, which should be included in the protection scope of the present application.

Claims

1. A tooling for clamping the left and right rear swingarms of an off-road vehicle, characterized in that: Includes a frame (35), on which a positioning part one and a positioning part two for placing a left rear horizontal fork and a right rear horizontal fork are provided. The positioning part one and the positioning part two have roughly the same structure and are symmetrically arranged about the Y-axis. The positioning part includes a U-shaped hole (1) that passes through the front end of the frame (35) and is used to accommodate the keyway of the front part of the left rear flat fork. A bow-shaped groove (2) for placing the bow part of the left rear flat fork is provided on the rear side of the frame (35). A square groove (3) is provided on the rear side of the frame (35) and to the left 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 stepped hole is provided on the rear side of the frame (35) and behind the square groove (3). An annular block (5) for supporting the rear end of the left rear flat fork is fixed in the stepped hole. The annular block (5) is coaxially arranged with the round hole of the left rear flat fork. A fan-shaped groove (6) for accommodating the lug of the rear part of the left rear flat fork is provided on the annular block (5). A plate groove (7) for accommodating the lug of the middle part of the left rear flat fork is also provided in the middle part of the frame (35). The second positioning part includes an elongated hole that passes through the front end of the frame (35) and is used to accommodate the keyway of the front part of the right rear horizontal fork. The front end of the frame (35) also has a circular hole that passes through to accommodate the bottom block of the front part of the right rear horizontal fork. The circular hole and the elongated hole are connected to form a U-shaped hole (8). The rear side of the frame (35) has an arch-shaped groove (9) for placing the bow part of the right rear horizontal fork. The rear side of the frame (35) and the right side of the arch-shaped groove (9) has a square groove (2). (10) A square block (11) for supporting the rear of the right rear flat fork is fixed in the square groove (10). A stepped hole (2) is opened on the rear side of the frame (35) and on the rear side of the square groove (10). An annular block (2) for supporting the rear end of the right rear flat fork is fixed in the stepped hole (2). The annular block (2) is coaxially arranged with the round hole of the right rear flat fork. A fan-shaped groove (2) (13) for accommodating the lug at the rear of the right rear flat fork is opened on the annular block (2). The frame (35) is also provided with a limiting component for limiting the left rear horizontal fork and the right rear horizontal fork, and a clamping mechanism for fixing the left rear horizontal fork and the right rear horizontal fork.

2. The tooling for clamping the left and right rear swingarms of an off-road vehicle according to claim 1, characterized in that, The limiting assembly includes a limiting part one for limiting the left rear horizontal fork and a limiting part two for limiting the right rear horizontal fork. The limiting part one 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 assembly (15) for limiting the front side of the left rear horizontal fork is fixed in the mounting groove (14). A fixing groove one (16) is opened in the middle of the frame (35) and located in front of the square groove one (3). A fixing block one (17) for limiting the left side of the left rear horizontal fork is fixed in the fixing groove one (16). A fixing groove two (18) communicating with the bow-shaped groove one (2) is opened on the rear side of the frame (35). A fixing block two (19) for limiting the right rear side of the left rear horizontal fork is fixed in the fixing groove two (18).

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

4. The tooling for clamping the left and right rear swingarms of an off-road vehicle according to claim 1, characterized in that, The clamping mechanism includes a clamping part one for fixing and clamping the front sides of the left and right rear horizontal forks and a clamping part two for fixing and clamping the rear sides of the left and right rear horizontal forks; the clamping part one includes a clamping key one (20) pressed on the outer arc surface of the front side of the left and right rear horizontal forks, the bottom surface of the clamping key one (20) is provided with an arc groove (21) adapted to the outer arc surface of the front side of the left and right rear horizontal forks, the clamping key one (20) is provided with a positioning hole one (22) symmetrically provided on the clamping key one (20), and the frame (35) is provided with an insertion hole one (2) coaxially provided with the positioning hole one (22). 3), and the insertion hole 1 (23) is located between the left rear horizontal fork and the right rear horizontal fork. The positioning hole 1 (22) is inserted through the positioning pin 1 (24) which connects the positioning hole 1 (22) and the insertion hole 1 (23) and is used to prevent the displacement of the clamping key 1 (20). The clamping key 1 (20) is located between the insertion hole 1 (23) and has a fixing hole 1 (25) through it. The frame (35) has a threaded hole 1 (26) that is coaxial with the fixing hole 1 (25). The clamping key 1 (20) is provided with an internal hex bolt that can pass through the fixing hole 1 (25) and be threadedly connected to the threaded hole 1 (26).

5. A tooling for clamping the left and right rear swingarms of an off-road vehicle according to claim 4, characterized in that, The clamping part two includes a clamping key two (27) pressed onto the bow of the left rear horizontal fork and the right rear horizontal fork. The clamping key two (27) is symmetrically provided with positioning holes two (28) that pass through the clamping key two (27). The frame (35) is provided with an insertion hole two (29) coaxially provided with the positioning hole two (28), and the insertion hole two (29) is located between the left rear horizontal fork and the right rear horizontal fork. The positioning hole two (28) is inserted through the positioning hole two (28). The positioning post 2 (30) is used to prevent displacement of the clamping key 2 (27) and the insertion hole 2 (29). The clamping key 2 (27) has a fixing hole 2 (31) through which it is located between the insertion holes 2 (29). The frame 35 has a threaded hole 2 (32) coaxially arranged with the fixing hole 2 (31). The clamping key 2 (27) is provided with an internal hex bolt that can pass through the fixing hole 2 (31) and be threaded to the threaded hole 2 (32).

6. The tooling for clamping the left and right rear swingarms of an off-road vehicle according to claim 1, characterized in that, The frame (35) is provided with handles (33) at the four corners for easy movement of the tooling; the frame (35) is also provided with support seats (34) symmetrical about the Y-axis on both sides.

7. A clamping method for the tooling used for clamping the left and right rear swingarms of an off-road vehicle as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Ensure that there is no deformation in any structure on the frame (35) and check whether the frame (35) is stable. At the same time, prepare the left rear horizontal fork and the right rear horizontal fork, and ensure that there is no damage to any part of them and that they meet the clamping requirements. S2. Place the tooling on a stable workbench, ensure that the frame (35) is stable and does not move, and check whether the handles (33) at the four corners are properly installed to facilitate subsequent operations; S3. Fix square block 1 (4) in square slot 1 (3) of frame (35), and then put ring block 1 (5) in step hole 1, but do not fix it first. Then put the left rear flat fork into positioning part 1, so that the keyway of the front part of the left rear flat fork is in U-shaped hole (1), the bow part of the left rear flat fork is in bow-shaped slot 1 (2), the lug of the middle part of the left rear flat fork is in plate slot (7), and adjust the position of ring block 1 (5) so that the lug of the rear part of the left rear flat fork is in fan-shaped slot 1 (6). Then fix ring block 1 (5) to ensure that the left rear flat fork is initially correctly placed. S4. Fix square block 2 (11) in square groove 2 (10) of frame (35), and then put ring block 2 (12) in step hole 2, but do not fix it first. Then put the right rear flat fork into positioning part 2, so that the keyway and bottom block of the right rear flat fork are in U-shaped hole (8), the bow of the right rear flat fork is in bow groove 2 (9), and adjust the position of ring block 2 (12) so that the lug of the rear of the right rear flat fork is in fan groove 2 (13). Then fix ring block 2 (12) to ensure that the right rear flat fork is initially correctly placed. S5. Then install the limiting part one. Fix the mounting block assembly (15) in the mounting slot (14) on the front side of the frame (35) to limit the position of the front side of the left rear flat fork. Then fix the fixing block one (17) in the fixing slot one (16) to limit the left side of the left rear flat fork. Finally, fix the fixing block two (19) in the fixing slot two (18) to limit the right rear side of the left rear flat fork, ensuring that the left rear flat fork is limited. S6. Similar to S5, install the second limiting part to ensure that the right rear horizontal fork is limited and that the second limiting part is symmetrical with the first limiting part. S7. Next, install the clamping part one on the front side of the left rear flat fork and the right rear flat fork, place the clamping key one (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 one (20) matches the outer arc surface, then use the positioning pin one (24) to be inserted from the positioning hole one (22) into the insertion hole one (23) for limiting, and finally insert the internal hex bolt from the fixing hole one (25) and thread it to the threaded hole one (26) for threaded connection. At this time, the internal hex bolt is not fully tightened. S8. Then, clamping part two is installed on the bow of the left rear flat fork and the right rear flat fork. Pressing key two (27) is placed on the bow of the left rear flat fork and the right rear flat fork. Then, positioning pin two (30) is inserted into the insertion hole two (29) from positioning hole two (28) for positioning. Finally, the internal hex bolt is inserted into the fixing hole two (31) and threaded into the threaded hole two (32) for threaded connection. At this time, the internal hex bolt is not fully tightened. S9. Finally, tighten the socket head cap screws on clamping part one and clamping part two alternately. S10. Conduct a comprehensive inspection of the tooling to ensure that all parts are correctly installed, the limit components and clamping mechanisms are secure, and the left and right rear horizontal forks are in fixed positions without loosening, so that the tooling can be easily moved to the work area where subsequent operations are to be performed later by means of the handle (33).

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