A fixture for assembling a continuously variable transmission housing

Abstract

The utility model discloses a kind of infinitely variable gearbox body combination tooling fixtures, including basic support module, one sequence blank positioning and clamping module and two sequence semi-finished product positioning and clamping module, one sequence blank positioning and clamping module is used to position and clamping to one sequence box body blank, two sequence semi-finished product positioning and clamping module is used to position and clamping to semi-finished product box body after completing one sequence processing, basic support module simultaneously carries one sequence blank positioning and clamping module and two sequence semi-finished product positioning and clamping module;One sequence blank positioning and clamping module is composed of adjustable support column, three groups of pressing plate, lateral jackscrew, anti-vibration clamp plate, mistake-preventing limiting column and positioning pin, complete rough machining;Two sequence semi-finished product positioning and clamping module utilizes the support seat of eight with M8 thread hole of top plate even distribution, semi-finished product flange edge is compressed by M8 bolt, continue finish machining.The combination tooling fixture of the utility model, two sequence processing can be continuously completed in one clamping of same fixture, reference is unified, production efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of machining tooling technology, specifically a combined tooling fixture that integrates the first-stage roughing and second-stage finishing of a continuously variable transmission (CVT) housing onto the same set of fixtures. Background Technology

[0002] The continuously variable transmission (CVT) housing, as the core load-bearing component of the transmission, has a complex structure, uneven wall thickness, numerous holes, and extremely high machining precision requirements. It requires two separate clamping operations with different orientations to complete the machining of different surfaces. In traditional machining processes, the first and second stages typically use two independent sets of tooling fixtures. After the first stage of machining, the workpiece needs to be disassembled and transferred to the second stage fixture for re-clamping and positioning. This approach has the following problems: 1. Large positioning error: During the two clamping processes, the workpiece's reference is difficult to be completely aligned, which easily leads to cumulative error, resulting in the final machining accuracy failing to meet the design requirements. This has a significant impact on key parts such as bearing holes and mounting surfaces on the housing. 2. Low production efficiency: The clamping and disassembly process is cumbersome, which takes up a lot of auxiliary operation time. In addition, the two sets of fixtures need to be debugged and maintained separately, and occupy two horizontal machining centers, which increases equipment investment and labor costs. 3. High operational complexity: Workers need to be familiar with the operation procedures of two sets of fixtures, and collisions and scratches are prone to occur during workpiece transfer, affecting the product qualification rate.

[0003] Therefore, developing a combined tooling fixture that can achieve continuous processing of first and second stages, reduce the number of clamping operations, and improve processing accuracy and efficiency has become an urgent problem to be solved in the field of continuously variable transmission (CVT) housing processing. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology, such as large positioning error, low production efficiency and complicated operation caused by two clamping operations, and to provide a continuously variable transmission housing combination tooling fixture with compact structure, strong versatility and the ability to complete the first and second processing operations in the same station.

[0005] The technical solution adopted by this utility model to solve the technical problem is as follows: A continuously variable transmission (CVT) body assembly fixture includes a basic support module, a first-stage blank positioning and clamping module, and a second-stage semi-finished product positioning and clamping module. The basic support module is a frame-type main body, including a base, a left side plate, a right side plate, a vertical plate, and a top plate fixed to the base. The first-stage blank positioning and clamping module includes a vertical support assembly, a pressure plate clamping assembly, a lateral clamping assembly, a vibration damping assembly, a misalignment prevention and limiting assembly, and a precision positioning assembly. The second-stage semi-finished product positioning and clamping module consists of multiple support seats with M8 threaded holes. The flange edge of the first-stage semi-finished box body is pressed together by M8 bolts to achieve positioning for the second-stage processing. The first-stage blank positioning and clamping module is installed on the basic support module to position and clamp the first-stage box body blank. The second-stage semi-finished product positioning and clamping module is also installed on the basic support module to position and clamp the semi-finished box body after the first-stage processing is completed. The basic support module simultaneously supports the first-stage blank positioning and clamping module and the second-stage semi-finished product positioning and clamping module, so that the same fixture can continuously complete the first-stage and second-stage processing in one clamping.

[0006] Furthermore, the vertical support assembly includes a left support column and a right support column mounted on the base, with adjustable height, used to support the bottom surface of the box blank; the pressure plate clamping assembly includes a left pressure plate clamping unit, a right upper pressure plate clamping unit, and a right lower pressure plate clamping unit disposed on the vertical plate 37, respectively clamping the upper left, upper right, and lower right sides of the box blank; the lateral tightening assembly includes a right-side set screw, horizontally clamping the side of the box blank; the anti-vibration assembly includes three upper anti-vibration auxiliary clamping devices and three lower anti-vibration auxiliary clamping devices, each of which has... The system includes a shock-absorbing clamping base and an open clamping plate, the open clamping plate being fixed to the vertical plate by bolts and the shock-absorbing clamping base; the anti-misalignment limiting assembly includes two bottom anti-misalignment limiting blocks, a right-middle anti-misalignment limiting post, a right-upper anti-misalignment limiting post, a left-upper anti-misalignment limiting post, and six top anti-misalignment limiting posts, corresponding to the edge contour of the box body, misalignment means interference; the precision positioning assembly includes a left positioning pin group and a right positioning pin group to achieve the reference positioning of the box body, the left positioning pin group including a left positioning pin seat and a left positioning pin, and the right positioning pin group including a right positioning pin seat and a right positioning pin.

[0007] Furthermore, the left pressure plate clamping unit includes a left pressure plate base, a left pressure plate, a left M24 pressure plate fixing rod, and a left M24 pressure plate fixing nut; the upper right pressure plate clamping unit includes an upper right pressure plate base, an upper right pressure plate, an upper right M24 pressure plate fixing rod, and an upper right M24 pressure plate fixing nut; the lower right pressure plate clamping unit includes a lower right pressure plate base, a lower right pressure plate, a lower right M24 pressure plate fixing rod, and a lower right M24 pressure plate fixing nut, which respectively clamp the upper left, upper right, and lower right sides of the box blank.

[0008] Furthermore, the left and right support columns are rotatable and detachable structures, and their height can be finely adjusted by replacing the shims to accommodate different models of enclosures.

[0009] Furthermore, the arrangement of the six anti-misalignment limit posts on the top plate corresponds to the process holes or flange contours on the semi-finished box body. If the direction or model is incorrect, mechanical interference will occur, and clamping cannot be completed.

[0010] Furthermore, the left pressure plate clamping unit is provided with a left-side fine-adjustable positioning point, the upper right pressure plate clamping unit is provided with an upper right fine-adjustable positioning point, and the lower right pressure plate clamping unit is provided with a lower right fine-adjustable positioning point, which are used to compensate for the deviation of the box size.

[0011] Furthermore, a lower support rib is welded between the base and the vertical plate, an upper support rib is welded between the top plate and the vertical plate, and lifting eye nuts are provided around the top plate for tooling hoisting.

[0012] Furthermore, a positioning point base and a positioning point are provided on the left side of the vertical plate and on the upper part of the left side pressure plate clamping unit. The positioning point contacts the side wall of the box blank to achieve lateral positioning, and the height of the positioning point is adjustable to fine-tune the positioning position or adapt to the switching of similar products.

[0013] Furthermore, a replaceable shim is provided below the positioning point, and the height of the positioning point can be finely adjusted by replacing the shim with one of different thicknesses.

[0014] In this invention, the switching between the first and second sequences does not require changing the fixture or recalibrating the reference; it is completed solely on the same set of combined fixtures. The specific working principle and steps are as follows: ① First-order machining: Place the box blank on the left and right support columns, and rotate the two support columns or replace the shims to finely adjust the height; the three sets of pressure plate clamping units on the left, upper right and lower right sides of the blank are pressed simultaneously, and the right side set screw is horizontally tightened; the anti-vibration auxiliary clamping device applies auxiliary clamping force to the side wall of the box through the open clamping plate (27) to suppress cutting chatter; the bottom anti-misalignment limit block and the surrounding anti-misalignment limit columns correspond to the edge / process hole of the blank, and interference will occur if the wrong placement is made to prevent misassembly; the left side positioning pin and the right side positioning pin are inserted into the blank reference hole to achieve precise positioning; after completing the above actions, the machine tool performs first-order machining such as milling, drilling and boring on the blank.

[0015] ② Process Switching: After the first process is completed, loosen all pressure plate nuts, set screws and anti-vibration devices, and lift out the semi-finished product; using the existing bolt holes on the edge of the semi-finished product flange, move it horizontally to the support seat on the top plate, so that the flange edge is in contact with the top surface of the support seat; pass the M8 bolt through the flange hole and screw it into the M8 threaded hole of the support seat to press and fix the semi-finished product, completing the second process positioning; at this time, the positioning pin is inserted into the machined reference hole again, automatically reproducing the reference of the first process, without the need for re-alignment.

[0016] ③ Second-stage machining: The machine tool continues to perform second-stage machining on the housing, such as precision milling, precision boring, and tapping; after machining is completed, the M8 bolts are loosened, the finished product is lifted off, and the next cycle begins.

[0017] Through the above steps, the same fixture can achieve continuous processing of the first and second stages by simply "loosening-translating-tightening bolts" without changing any parts or adding any flipping or rotating actions, ensuring consistent reference and improving accuracy and efficiency.

[0018] This invention combines a single-stage and two-stage clamping of continuously variable transmission (CVT) housings onto a single tooling fixture. The addition of anti-misalignment limiting devices in both stages reduces operational difficulty and improves clamping efficiency. Several anti-vibration auxiliary fixtures are added to the single-stage clamping to strengthen the gripping of the blank, effectively reducing vibration and precision deviations. This combined CVT housing fixture effectively solves the problems of large positioning errors, low production efficiency, and complex operation associated with traditional two independent tooling fixtures, providing efficiency and quality assurance for CVT housing production. The positive and beneficial effects that this utility model can achieve are as follows: 1. Improved precision: This utility model reduces the number of clamping operations and lowers positioning errors through an integrated positioning design. It also incorporates an anti-vibration clamping device to prevent vibrations during processing, ensuring that the machining precision of the continuously variable transmission housing meets design requirements.

[0019] 2. Improved efficiency: This utility model allows for quick and convenient switching between two processes, reduces auxiliary time, adds error-proof auxiliary positioning devices, simplifies the operation process, reduces the difficulty of clamping for workers, and improves overall production efficiency. 3. Cost reduction: One set of fixtures can meet the processing requirements of two processes, reducing equipment investment and maintenance costs, while reducing the scrap rate of workpieces, saving production costs and the pressure of tooling storage space; 4. High versatility: Each positioning component and clamping mechanism can be adjusted according to the size of different models of boxes, adapting to the processing of various specifications of products, and has a wide range of applications. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention (showing the basic support module and the first-order blank positioning and clamping module). Figure 2 This is a schematic diagram of the clamping state of a blank in sequence; Figure 3 This is a three-dimensional structural schematic diagram of the present invention from another perspective (showing the two-stage semi-finished product positioning and clamping module). Figure 4 This is a schematic diagram of the clamping state of the second-stage semi-finished product.

[0021] In the attached diagram, 1—base, 2—left side pressure plate base, 3—left side pressure plate, 4—left side M24 pressure plate fixing rod, 5—left side M24 pressure plate fixing nut, 6—left side adjustable positioning point, 7—upper support rib, 8—positioning point base, 9—positioning point, 10—upper right pressure plate base, 11—upper right pressure plate, 12—upper right M24 pressure plate fixing rod, 13—upper right M24 pressure plate fixing nut 14--Lower right pressure plate base, 15--Lower right pressure plate, 16--Lower right M24 pressure plate fixing rod, 17--Lower right M24 pressure plate fixing nut, 18--Left support column, 19--Right support column, 20--Lower right fine-adjustable positioning point, 21--Upper right fine-adjustable positioning point, 22--Right side set screw, 23--First anti-vibration auxiliary clamping device, 24--Second anti-vibration auxiliary clamping device, 25--Third anti-vibration device Auxiliary clamping device, 26--Fourth anti-vibration auxiliary clamping device, 27--Open clamping plate, 28--Fifth anti-vibration auxiliary clamping device, 29--Sixth anti-vibration auxiliary clamping device, 30--Lower left anti-misalignment limit block, 31--Lower right anti-misalignment limit block, 32--Right center anti-misalignment limit post, 33--Upper right anti-misalignment limit post, 34--Upper left anti-misalignment limit post, 35--Left side plate, 36--Right side plate, 37--Vertical plate, 3 8—Lower support rib plate, 39—Top plate, 40—Lifting eye nut, 41—Left side positioning pin seat, 42—Left side positioning pin, 43—Right side positioning pin seat, 44—Right side positioning pin, 45—Support seat, 46—First anti-misalignment limit post, 47—Second anti-misalignment limit post, 48—Third anti-misalignment limit post, 49—Fourth anti-misalignment limit post, 50—Fifth anti-misalignment limit post, 51—Sixth anti-misalignment limit post. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] See Figures 1-4A continuously variable transmission (CVT) housing assembly fixture includes a base support module, a first-stage blank positioning and clamping module, and a second-stage semi-finished product positioning and clamping module. The first-stage blank positioning and clamping module is mounted on the base support module and is used to position and clamp the first-stage housing blank. The second-stage semi-finished product positioning and clamping module is also mounted on the base support module and is used to position and clamp the semi-finished housing after the first-stage processing is completed. The base support module simultaneously supports the first-stage blank positioning and clamping module and the second-stage semi-finished product positioning and clamping module, so that the same fixture can continuously complete the first-stage and second-stage processing in one clamping.

[0024] The three modules share the same base 1, enabling "one-time investment and two-stage continuous processing".

[0025] like Figure 1 and Figure 3 As shown, the basic support module is a frame-type main body, including a base 1, a left side plate 35, a right side plate 36, a vertical plate 37, and a top plate 39 fixed to the base 1; the first-stage blank positioning and clamping module includes a vertical support assembly, a pressure plate clamping assembly, a lateral clamping assembly, an anti-vibration assembly, an anti-misalignment limiting assembly, and a precise positioning assembly; the second-stage semi-finished product positioning and clamping module consists of multiple support seats 45 with M8 threaded holes. The support seats 45 press the flange edge of the first-stage semi-finished product box with M8 bolts to achieve second-stage processing positioning.

[0026] The vertical support assembly includes a left support column 18 and a right support column 19 installed on the base 1, with adjustable height, used to support the bottom surface of the first-order box blank; the pressure plate clamping assembly includes a left pressure plate clamping unit, a right upper pressure plate clamping unit and a right lower pressure plate clamping unit set on the vertical plate 37, which respectively clamp the upper left, upper right and lower right sides of the box blank; the lateral tightening assembly includes a right side top screw 22, which horizontally tightens the side of the box blank.

[0027] The anti-vibration assembly includes three upper anti-vibration auxiliary clamping devices 23, 24, and 25, and three lower anti-vibration auxiliary clamping devices 26, 28, and 29. Each anti-vibration auxiliary clamping device includes an anti-vibration clamping base and an open clamping plate 27. The open clamping plate 27 is fixed to the vertical plate 37 by bolts and the anti-vibration clamping base. When the continuously variable transmission (CVT) housing blank is clamped, the open clamping plates of the six anti-vibration auxiliary clamping devices are in contact with the corresponding protrusions on the back of the housing blank. By tightening the clamping bolts, the protrusions on the back of the blank are clamped, which serves as an auxiliary clamping device for the three pressure plate clamping devices, strengthening the fixation of the blank and reducing the occurrence of vibration marks, substandard dimensional accuracy, and poor accuracy stability caused by workpiece vibration during processing.

[0028] For the clamping of the continuously variable transmission (CVT) housing blank, since the overall shape of the housing is rectangular, to prevent inexperienced employees from accidentally clamping the blank in the wrong direction (which could lead to a collision and loss), a misalignment prevention and limiting component is installed on the base plate 1. The misalignment prevention and limiting component includes two bottom misalignment prevention blocks 30 and 31, a right-middle misalignment prevention and limiting post 32, a right-upper misalignment prevention and limiting post 33, a left-upper misalignment prevention and limiting post 34, and six top misalignment prevention and limiting posts 46, 47, 48, 49, 50, and 51, which correspond to the edge contour of the housing. Misalignment will result in interference. The precision positioning component includes a left positioning pin group and a right positioning pin group to achieve the reference positioning of the housing. The left positioning pin group includes a left positioning pin seat 41 and a left positioning pin 42, and the right positioning pin group includes a right positioning pin seat 43 and a right positioning pin 44.

[0029] The left-side pressure plate clamping unit includes a left-side pressure plate base 2, a left-side pressure plate 3, a left-side M24 pressure plate fixing rod 4, and a left-side M24 pressure plate fixing nut 5, which are used to clamp the left side of the continuously variable transmission (CVT) body blank. The upper right-side pressure plate clamping unit includes an upper right-side pressure plate base 10, an upper right-side pressure plate 11, an upper right-side M24 pressure plate fixing rod 12, and an upper right-side M24 pressure plate fixing nut 13, which are used to clamp the upper right side of the CVT body blank. The lower right-side pressure plate clamping unit includes a lower right-side pressure plate base 14, a lower right-side pressure plate 15, a lower right-side M24 pressure plate fixing rod 16, and a lower right-side M24 pressure plate fixing nut 17, which are used to clamp the lower right side of the CVT body blank.

[0030] A left support column 18 and a right support column 19 are provided on the base 1 to provide vertical support for the blank of the continuously variable transmission housing. The support points can be rotated and disassembled. The height of the support points can be finely adjusted by replacing different shims, thereby adjusting the positioning of the blank to adapt to different housing models. Tooling adjustments can be easily made when switching to similar products.

[0031] like Figure 4 As shown, the six anti-misalignment limit posts 46, 47, 48, 49, 50, and 51 on the top plate 39 are positioned to correspond to the process holes or flange outlines on the semi-finished box body. If the direction or model is incorrect, mechanical interference will occur, and clamping cannot be completed.

[0032] The left pressure plate clamping unit is equipped with a left-side fine-adjustable positioning point 6, the upper right pressure plate clamping unit is equipped with an upper right fine-adjustable positioning point 21, and the lower right pressure plate clamping unit is equipped with a lower right fine-adjustable positioning point 20, which are used to compensate for the deviation of the box size.

[0033] A lower support rib 38 is welded between the base 1 and the vertical plate 37, and an upper support rib 7 is welded between the top plate 39 and the vertical plate 37. Their function is to provide auxiliary reinforcement to the connection between the vertical plate 37, the base 1, and the top plate 39, increase the rigidity of the main structure, and maintain the clamping accuracy stably when machining large-mass continuously variable transmission (CVT) gearbox body workpieces, reduce the vibration that occurs when the spindle is cutting with strong force, and provide a basic guarantee for the achievement of dimensional machining accuracy and stability.

[0034] On the left side of the vertical plate 37, and on the upper part of the left pressure plate clamping unit, there are positioning point bases 8 and positioning points 9. Positioning point 9 contacts the side wall of the box blank to achieve lateral positioning, and the height of positioning point 9 is adjustable to fine-tune the positioning position or adapt to the switching of similar products.

[0035] A replaceable shim can be installed below positioning point 9. By replacing the shim with one of different thicknesses, the height of positioning point 9 can be finely adjusted, which facilitates fine-tuning of the positioning of the box blank and adaptation when switching to similar products.

[0036] Lifting eye nuts 40 are provided around the top plate 39 to facilitate the lifting of the tooling during disassembly and assembly.

[0037] By combining the first and second-stage clamping of continuously variable transmission (CVT) housings onto a single tooling fixture, and adding anti-misoperation limit devices in both stages, the operational difficulty for workers is reduced, and clamping efficiency is improved. Several anti-vibration auxiliary fixtures are added to the first-stage clamping stage to strengthen the gripping of the blank, effectively reducing the occurrence of vibration and out-of-tolerance precision issues. This combined CVT housing fixture effectively solves the problems of large positioning errors, low production efficiency, and complex operation caused by traditional two independent tooling fixtures, providing efficiency and quality assurance for CVT housing production.

[0038] An embodiment of a continuously variable transmission (CVT) housing assembly tooling fixture includes a basic support module, a first-stage blank positioning and clamping module, and a second-stage semi-finished product positioning and clamping module.

[0039] A. Basic support module: The base 1, left side plate 35, right side plate 36, vertical plate 37 and top plate 39 form a closed frame; the upper support rib 7 and the lower support rib 38 are welded to the corners of the top plate and the vertical plate, and the base and the vertical plate, respectively, to improve rigidity; the top plate is equipped with lifting eye nuts 40 at the four corners for easy hoisting in the workshop.

[0040] B. First-order blank positioning and clamping module: Ⅰ. Vertical support: The left support column 18 and the right support column 19 are screwed into the base 1 and can be rotated and disassembled as a whole. The column ends are in contact with the bottom surface of the blank. The height can be finely adjusted by replacing the shims of different thicknesses to adapt to the height differences of the series of boxes. II. Clamping with pressure plates: Left pressure plate clamping unit: Left pressure plate base 2 → Left pressure plate 3 → Left M24 pressure plate fixing rod 4 → Left M24 pressure plate fixing nut 5; Upper right pressure plate clamping unit: Upper right pressure plate base 10 → Upper right pressure plate 11 → Upper right M24 pressure plate fixing rod 12 → Upper right M24 pressure plate fixing nut 13; Lower right pressure plate clamping unit: Lower right pressure plate base 14 → Lower right pressure plate 15 → Lower right M24 pressure plate fixing rod 16 → Lower right M24 pressure plate fixing nut 17.

[0041] The three pressure plates are arranged in a three-point layout of "upper left-upper right-lower right" to form a closed force system and prevent the blank from shifting during rough machining.

[0042] III. Lateral tightening: The right-side set screw 22 is screwed into the right-side plate 36, and the end face is horizontally tightened against the side of the blank to eliminate lateral freedom.

[0043] IV. Anti-vibration: Three upper anti-vibration auxiliary clamping devices 23, 24, and 25 are arranged on the upper part of the vertical plate; three lower anti-vibration auxiliary clamping devices 26, 28, and 29 are arranged on the lower part of the vertical plate; the open clamping plates 27 of each device are locked to the anti-vibration clamping base by bolts, which can form auxiliary clamping on the side wall of the box and effectively suppress the chatter during milling and boring.

[0044] V. Anti-misalignment limit: Bottom: The lower left anti-misalignment limit block 30 and the lower right anti-misalignment limit block 31 correspond to the notch on the bottom surface of the blank; Middle section: Right center anti-misalignment limit post 32, upper right anti-misalignment limit post 33, and upper left anti-misalignment limit post 34 correspond to the side bosses of the blank; Top: The sixth anti-misalignment limit posts 46, 47, 48, 49, 50, and 51 correspond to the process holes or flange outlines on the upper surface of the blank; If the wrong type or the wrong model is placed, the limit post will mechanically interfere with the blank and will not be able to fall into the clamping area of ​​the pressure plate, thus preventing misinstallation.

[0045] VI. Precise positioning: The left positioning pin seat 41 contains the left positioning pin 42, and the right positioning pin seat 43 contains the right positioning pin 44. The two pins cooperate with the two pre-machined reference holes on the blank to achieve micron-level repeatable positioning.

[0046] VII. Lateral fine adjustment: Positioning point base 8 and positioning point 9 are provided on the left side of vertical plate 37 and above the left pressure plate clamping unit. Positioning point 9 contacts the side wall of the blank and undertakes lateral positioning. Different thickness shims can be replaced below positioning point 9 so that the extension of positioning point can be steplessly adjusted within the range of 1-5 mm, which is convenient for switching between similar products or for processing allowance compensation.

[0047] C. Second-stage semi-finished product positioning and clamping module: Eight support seats 45 with M8 threaded holes are evenly distributed on the top plate 39. After the first stage is completed, the semi-finished product is lifted out and its flange edge is naturally placed on the top surface of the support 45. The flange hole and the threaded hole are aligned, and the M8 bolts are inserted and tightened to press the semi-finished product onto the top plate. At this time, the original reference hole is still fitted on the left positioning pin 42 and the right positioning pin 44, automatically reproducing the first-stage reference, without the need for re-alignment. The machine tool continues to perform second-stage processing such as precision milling, precision boring, and tapping on the housing.

[0048] D. Two-order switching process: 1. Loosen the pressure plate → loosen the top screw → loosen the anti-vibration device → lift out the semi-finished product; 2. Move the semi-finished product to the support base (45) → insert the M8 bolt → tighten; 3. Start the second-stage processing procedure; 4. After processing is complete, loosen the bolts and lift the finished product away.

[0049] The entire process takes ≤3 minutes, with a unified reference standard and coaxiality and parallelism ≤0.02 mm.

[0050] E. Effects: 1. The same fixture can complete both roughing and finishing processes, reducing one changeover and increasing production efficiency by more than 30%; 2. The reference hole and the locating pin always fit together, both sequences have the same reference, and the cumulative error is ≤0.02 mm; 3. Anti-misalignment limit switches prevent incorrect installation, and anti-vibration devices suppress vibrating blades, increasing the pass rate to over 99%. 4. All positioning and clamping components are adjustable, which can cover a variety of housing models and has strong versatility; 5. One set of fixtures replaces two sets, reducing equipment investment, maintenance costs, and inventory area by more than 40%.

[0051] In this utility model, all terms involving directions such as "upper part", "lower part", "front end", "rear end", "tail", "left side", "right side", "left side", "right side", "upper", and "lower" are used to explain the structure and technical solution of this utility model, but do not limit the structure and technical solution of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model shall be included within the protection scope of this utility model.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuously variable transmission (CVT) housing assembly fixture, characterized in that: The continuously variable transmission (CVT) gearbox assembly fixture includes a basic support module, a first-stage blank positioning and clamping module, and a second-stage semi-finished product positioning and clamping module; the basic support module is a frame-type main body, including a base (1), a left side plate (35), a right side plate (36), a vertical plate (37), and a top plate (39) fixed to the base (1); the first-stage blank positioning and clamping module includes a vertical support assembly, a pressure plate clamping assembly, a lateral clamping assembly, an anti-vibration assembly, an anti-misalignment limiting assembly, and a precision positioning assembly; the second-stage semi-finished product positioning and clamping module consists of multiple support seats with M8 threaded holes ( Composed of 45), the support base (45) presses the flange edge of the first-order semi-finished box body with M8 bolts to realize the positioning of the second-order processing; the first-order blank positioning and clamping module is installed on the basic support module and is used to position and clamp the first-order box body blank; the second-order semi-finished product positioning and clamping module is also installed on the basic support module and is used to position and clamp the semi-finished box body after the first-order processing is completed; the basic support module simultaneously carries the first-order blank positioning and clamping module and the second-order semi-finished product positioning and clamping module, so that the same fixture can continuously complete the first-order and second-order processing in one clamping.

2. The continuously variable transmission (CVT) housing assembly tooling fixture according to claim 1, characterized in that: The vertical support assembly includes a left support column (18) and a right support column (19) installed on the base (1), with adjustable height, for supporting the bottom surface of the first-order box blank; the pressure plate clamping assembly includes a left pressure plate clamping unit, a right upper pressure plate clamping unit and a right lower pressure plate clamping unit set on the vertical plate (37), which respectively clamp the upper left, upper right and lower right sides of the box blank; the lateral tightening assembly includes a right side top screw (22), which horizontally clamps the side of the box blank; the anti-vibration assembly includes three upper anti-vibration auxiliary clamping devices (23, 24, 25) and three lower anti-vibration auxiliary clamping devices (26, 28, 29), each anti-vibration auxiliary clamping device including an anti-vibration clamping base and an open clamping plate (27). The open clamp (27) is fixed to the vertical plate (37) by bolts and anti-vibration clamping base; the anti-misalignment limiting component includes two bottom anti-misalignment limiting blocks (30, 31), right middle anti-misalignment limiting post (32), right upper anti-misalignment limiting post (33), left upper anti-misalignment limiting post (34) and six top anti-misalignment limiting posts (46, 47, 48, 49, 50, 51), which correspond to the edge contour of the box body. Misalignment means interference; the precise positioning component includes a left positioning pin group and a right positioning pin group to realize the reference positioning of the box body. The left positioning pin group includes a left positioning pin seat (41) and a left positioning pin (42). The right positioning pin group includes a right positioning pin seat (43) and a right positioning pin (44).

3. The continuously variable transmission (CVT) housing assembly fixture according to claim 2, characterized in that: The left pressure plate clamping unit includes a left pressure plate base (2), a left pressure plate (3), a left M24 pressure plate fixing rod (4), and a left M24 pressure plate fixing nut (5); the right upper pressure plate clamping unit includes a right upper pressure plate base (10), a right upper pressure plate (11), a right upper M24 pressure plate fixing rod (12), and a right upper M24 pressure plate fixing nut (13); the right lower pressure plate clamping unit includes a right lower pressure plate base (14), a right lower pressure plate (15), a right lower M24 pressure plate fixing rod (16), and a right lower M24 pressure plate fixing nut (17), which respectively press the left upper, right upper, and right lower sides of the box blank.

4. The continuously variable transmission (CVT) housing assembly fixture according to claim 2, characterized in that: The left support column (18) and right support column (19) are rotatable and detachable structures, and their height can be finely adjusted by replacing the shims to adapt to different models of boxes.

5. The continuously variable transmission (CVT) housing assembly fixture according to claim 2, characterized in that: The arrangement of the six anti-misalignment limit posts (46, 47, 48, 49, 50, 51) on the top plate (39) corresponds to the process holes or flange outlines on the semi-finished box body. If the direction or model is incorrect, mechanical interference will occur, and clamping cannot be completed.

6. The continuously variable transmission (CVT) housing assembly tooling fixture according to claim 3, characterized in that: The left pressure plate clamping unit is provided with a left fine-adjustable positioning point (6), the right upper pressure plate clamping unit is provided with a right upper fine-adjustable positioning point (21), and the right lower pressure plate clamping unit is provided with a right lower fine-adjustable positioning point (20), which are used to compensate for the deviation of the box size.

7. The continuously variable transmission (CVT) housing assembly tooling fixture according to any one of claims 1 to 6, characterized in that: A lower support rib (38) is welded between the base (1) and the vertical plate (37), and an upper support rib (7) is welded between the top plate (39) and the vertical plate (37). A lifting eye nut (40) is provided around the top plate (39) for tooling hoisting.

8. The continuously variable transmission (CVT) housing assembly tooling fixture according to claim 2 or 3, characterized in that: On the left side of the vertical plate (37), and on the upper part of the left pressure plate clamping unit, there is a positioning point base (8) and a positioning point (9). The positioning point (9) contacts the side wall of the box blank to achieve horizontal positioning, and the height of the positioning point (9) is adjustable to finely adjust the positioning position or adapt to the switching of similar products.

9. The continuously variable transmission (CVT) housing assembly fixture according to claim 8, characterized in that: A replaceable shim is provided below the positioning point (9), and the height of the positioning point (9) can be finely adjusted by replacing the shim with one of different thicknesses.

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