Fixture for ensuring no deformation of shifting fork and use method

Abstract

The invention discloses a clamp capable of guaranteeing that a shifting fork does not deform and a using method, belongs to the technical field of shifting fork machining, and solves the problem that an existing shifting fork is prone to deformation in machining. The clamp comprises a bottom plate, supporting plates are arranged on the two sides of the bottom plate, a first pressing assembly for pressing one end of a shifting fork is arranged on one side of each supporting plate, a second extrusion assembly for pressing the two shifting forks at the same time is arranged in the middle of the bottom plate, and two symmetrically-arranged positioning columns are arranged above the bottom plate; a positioning column is arranged on the bottom plate, a locking screw rod is arranged on the bottom plate below the positioning column, a Y-shaped pressing plate for pressing the shifting fork is arranged on the locking screw rod, one end of the Y-shaped pressing plate is in contact with the shifting fork, a positioning plate is arranged below the other end of the Y-shaped pressing plate, and a supporting column is arranged on the positioning plate. According to the clamp capable of guaranteeing the shifting fork not to deform and the using method, the shifting fork is effectively positioned and clamped, and the size precision is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of shift fork processing, and in particular to a clamp for ensuring that a shift fork does not deform and a use method thereof. Background Art

[0002] The shift fork is one of the most important parts of the gearbox. Figure 5 As shown, the fork 1 includes a fork head 11, a fork arm 12 and a fork clamping opening 13. During the production process, it is necessary to process the fork connecting hole 14 on the fork head 11, and the fork clamping openings 13 on both sides need to be milled. The required processing accuracy is high, and the parallel accuracy of the fork clamping openings 13 on both sides is required to be 0.1mm. The existing clamping method usually uses conventional pressing blocks for clamping. Due to the use of forged steel blanks for processing, there are great differences in the appearance of the fork after forging, and the uniqueness of the clamping reference cannot be achieved. The products processed by conventional clamping will inevitably produce large thickness deviations of the fork, and the required dimensional accuracy cannot be guaranteed. At the same time, the special-shaped surface of the fork is relatively prominent, and the clamping space is relatively small. Conventional clamping cannot guarantee the clamping stability, and there is interference and compression clamping. After the processing is completed, the deformation is large, which exceeds the design requirements, and the processed products cannot be assembled and used normally. At the same time, because the clamping point is not in the processing position, the rigidity of the processing part is insufficient, serious vibration marks are produced, and the processed products do not meet the design requirements. In order to ensure the processing accuracy, a device for processing the fork without deformation is urgently needed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a clamp and a method of use for ensuring that the shift fork does not deform in view of the above-mentioned deficiencies in the prior art, so as to effectively position and clamp the shift fork and effectively ensure dimensional accuracy, and the present invention has the characteristics of wide application range and strong practicality.

[0004] The technical solution adopted by the present invention is: a clamp to ensure that the shift fork does not deform, including a base plate, support plates are provided on both sides of the base plate, each of the support plates is provided with a first clamping assembly on one side for clamping one end of the shift fork, a second extrusion assembly for simultaneously clamping two shift forks is provided in the middle position of the base plate, two symmetrically arranged positioning columns are provided above the base plate, a locking screw is provided on the base plate below the positioning columns, a Y-shaped pressure plate for clamping the shift fork is provided on the locking screw, one end of the Y-shaped pressure plate is in contact with the shift fork, a positioning plate is provided below the other end of the Y-shaped pressure plate, a support column is provided on the positioning plate, the support column is in contact with the Y-shaped pressure plate, and a locking nut is provided on the locking screw.

[0005] As a further improvement, the first clamping assembly includes a first pressure plate, a first screw and a locking nut. The lower end of the first screw is connected to the base plate, the first pressure plate is sleeved on the first screw, the locking nut is installed on the first screw, and the two sides of the first pressure plate are respectively clamped on the support plate and the fork.

[0006] Furthermore, the second extrusion assembly includes a positioning block, a second pressure plate, a second screw and a locking nut. The positioning block is installed in the middle position of the base plate, the lower end of the second screw is installed on the positioning block, the second pressure plate is sleeved on the second screw, the locking nut is installed on the second screw, and the two sides of the second pressure plate are respectively pressed on the forks on both sides.

[0007] Furthermore, small bosses are provided on both sides of the bottom of the first pressing plate and the second pressing plate, and supporting grooves adapted to the small bosses are provided on the supporting plate.

[0008] Furthermore, the positioning column is provided with two limit blocks arranged in a V shape, and the angle between the inner walls of the two limit blocks is 60° to 80°.

[0009] Furthermore, a spherical support block with a hemispherical structure is provided on the top of the support column, and the spherical support block is in point contact with the Y-shaped pressing plate.

[0010] A method for using a clamp to ensure that a shift fork does not deform, firstly, the bottom surface of the shift fork is milled flat to ensure that the bottom surface is of uniform standard, then the shift fork is turned over and placed on a bottom plate, and is positioned and limited by positioning blocks and positioning columns, wherein the positioning columns use V-shaped limit blocks to ensure that the thickness of the outer circle of the shift fork head is symmetrically distributed, and then the first clamping component, the second extrusion component and the Y-type pressing plate are locked, and the Y-type pressing plate is used to symmetrically press the shift fork head at a close distance to ensure the drilling accuracy, and the first pressing plate and the second pressing plate are used to symmetrically press the shift fork arm on one side of the shift fork clamping port at a close distance to ensure the parallelism of the milling surface.

[0011] Furthermore, the specific steps are as follows:

[0012] S1: First install the fork on the fixture and mill the bottom surface to ensure the bottom surface is uniform and standard;

[0013] S2: Turn the shift fork over and place it on the bottom plate, and use the positioning block and positioning column to position and limit it. The positioning column uses the V-shaped limit block to ensure that the thickness of the outer circle of the shift fork head is symmetrical and evenly distributed;

[0014] S3: Check whether the small bosses and corresponding pivots of all pressure plates meet the use requirements. If there is a damaged side that cannot be used, it must be maintained and replaced;

[0015] S4: Check whether the fork meets the normal processing requirements. If there are forging cracks, pores, severe deformation and other forging defects, the forging side cannot be processed;

[0016] S5: tighten the locking nut of the first clamping assembly, and then tighten the locking nut of the second extrusion assembly, so that the first pressing plate and the second pressing plate press the two ends of the fork arm on one side of the fork locking opening;

[0017] S6: Tighten the locking nut on the locking screw, and use the Y-shaped pressure plate to press the fork over a large area to lock and fix the positions of the fork that need to be processed.

[0018] Beneficial Effects

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The present invention provides a clamp and a method for using the clamp to ensure that the shift fork does not deform. By setting two workstations, two shift forks can be clamped at the same time for processing, which effectively improves the processing efficiency. During use, the locking nut on the locking screw is first loosened to allow the Y-shaped pressure plate to move flexibly. During the installation of the shift fork, the positioning block and the positioning column are used to position and limit it to ensure the uniformity of the clamping reference. The positioning column uses a V-shaped limit block to ensure that the thickness of the outer circle of the shift fork head is symmetrically distributed to avoid interference during the assembly of the whole machine. After the positioning is completed, the locking nut of the first clamping assembly is first tightened, and then the locking nut of the second extrusion assembly is tightened, so that the first pressure plate and the second pressure plate press the two ends of the shift fork tightly, and a small boss is set at the bottom , in the natural state, it can better correspond to the pressure point of the shift fork, play a balancing role, make the clamping of the shift fork stable, there is no interference, clamping under pressure, effectively ensure the size and roughness and no deformation after processing, finally tighten the locking nut on the locking screw, and use the Y-type pressure plate to press the shift fork over a large area, which plays a role of strongly pressing the shift fork to prevent loosening during processing and ensure processing accuracy. Compared with the conventional installation method, the shift fork is clamped by this device. After the shift fork is processed in the previous process, it has a complete and unified reference surface as support, and there is no reference inconsistency. It is to ensure the uniqueness of clamping and the stability of mass production, and to ensure that the shift fork is not deformed after processing. It has the characteristics of strong practicality and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is an enlarged schematic diagram of the structure of the positioning column in the present invention;

[0023] Figure 3 It is an enlarged schematic diagram of the structure of the first pressing block in the present invention;

[0024] Figure 4 It is an enlarged schematic diagram of the structure of the positioning plate in the present invention;

[0025] Figure 5 It is an enlarged schematic diagram of the structure of the shift fork in the present invention.

[0026] Among them: 1-shift fork, 2-first clamping assembly, 3-second extrusion assembly, 4-bottom plate, 5-support plate, 6-support groove, 7-positioning plate, 8-support column, 9-locking screw, 10-Y-type pressure plate, 11-shift fork head, 12-shift fork arm, 13-shift fork positioning port, 14-shift fork connecting hole, 15-spherical support block, 16-positioning column, 17-limiting block, 18-small boss, 21-small boss, 22-locking nut, 23-first pressure plate, 31-positioning block, 32-second pressure plate, 33-second screw. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0028] See also Figure 1-5As shown, a clamp for ensuring that the shift fork does not deform of the present invention comprises a bottom plate 4, support plates 5 are provided on both sides of the bottom plate 4, a first pressing assembly 2 for pressing one end of the shift fork 1 is provided on one side of each support plate 5, a second extrusion assembly 3 for simultaneously pressing two shift forks 1 is provided at the middle position of the bottom plate 4, two symmetrically arranged positioning columns 16 are provided above the bottom plate 4, a locking screw 9 is provided on the bottom plate 4 below the positioning column 16, a Y-shaped pressing plate 10 for pressing the shift fork 1 is provided on the locking screw 9, one end of the Y-shaped pressing plate 10 is in contact with the shift fork 1, and the other end of the Y-shaped pressing plate 10 is in contact with the shift fork 1. A positioning plate 7 is provided below one end, a support column 8 is provided on the positioning plate 7, the support column 8 is in contact with the Y-shaped pressure plate 10, and a locking nut 22 is provided on the locking screw 9. By setting two workstations, two shift forks 1 can be clamped for processing at the same time, which effectively improves the processing efficiency. During use, the locking nut 22 on the locking screw 9 is first loosened to allow the Y-shaped pressure plate 10 to move flexibly. During the installation of the shift fork 1, the positioning block 31 and the positioning column 16 are used to position and limit it to ensure the uniformity of the clamping reference, wherein the positioning column 16 is limited by a V-shaped arrangement Block 17 ensures that the thickness of the outer circle of the fork head 11 is symmetrical and evenly distributed to avoid interference during assembly of the whole machine. After positioning is completed, the locking nut 22 of the first clamping component 2 is tightened first, and then the locking nut 22 of the second extrusion component 3 is tightened, so that the first pressing plate 23 and the second pressing plate 32 press the two ends of the fork 1. By setting a small boss 21 at the bottom, it can better correspond to the pressure point of the fork 1 in the natural state, play a balancing role, so that the fork 1 is clamped stably, and there is no interference or compression when clamping, which effectively ensures the size and roughness. The locking nut 22 on the locking screw 9 is tightened finally, and the fork 1 is pressed over a large area by the Y-type pressure plate 10, which plays a role of strongly pressing the fork 1 to prevent loosening during processing and ensure processing accuracy. Compared with the conventional device method, the fork 1 is clamped by the device. After the fork 1 is processed in the previous process, it has a complete and unified reference surface as support, and there is no reference inconsistency, which ensures the uniqueness of the clamping and the stability of mass production, ensures that the fork 1 does not deform after processing, and improves the quality of the product.

[0029] Specifically, the first clamping assembly 2 includes a first pressure plate 23, a first screw 21 and a locking nut 22. The lower end of the first screw 21 is connected to the base plate 4. The first pressure plate 23 is sleeved on the first screw 21. The locking nut 22 is installed on the first screw 21. The two sides of the first pressure plate 23 are respectively pressed on the support plate 5 and the fork 1. The first pressure plate 23 is pressed by tightening the locking nut 22 to clamp the fork 1. The first clamping assembly 2 is arranged on one side of the fork positioning opening 13, and can be clamped at a close distance to prevent vibration marks from being generated when processing the fork positioning opening 13, thereby effectively improving the flatness.

[0030] Preferably, the second extrusion assembly 3 includes a positioning block 31, a second pressure plate 32, a second screw 33 and a locking nut 22. The positioning block 31 is installed in the middle position of the base plate 4, the lower end of the second screw 33 is installed on the positioning block 31, the second pressure plate 32 is sleeved on the second screw 33, and the locking nut 22 is installed on the second screw 33. The two sides of the second pressure plate 32 are respectively pressed on the forks 1 on both sides. By tightening the locking nut 22 to compress the second pressure plate 32, the two ends of the second pressure plate 32 can simultaneously press the forks 1 on both sides, thereby realizing the function of clamping two at the same time and improving the clamping efficiency.

[0031] Furthermore, small bosses 18 are provided on both sides of the bottom of the first pressing plate 23 and the second pressing plate 32, and a supporting groove 6 adapted to the small bosses 18 is opened on the supporting plate 5. The pressure point of the small boss 18 corresponds to the supporting point, which plays a balancing role and makes the fork clamping stable.

[0032] Furthermore, two V-shaped limit blocks 17 are provided on the positioning column 16, and the inner wall angle of the two limit blocks 17 is 60° to 80°, so as to ensure that the thickness of the outer circle of the shift fork 1 is symmetrical and evenly distributed, and avoid interference during assembly of the whole machine.

[0033] Furthermore, a spherical support block 15 with a hemispherical structure is provided on the top of the support column 8. The spherical support block 15 is in point contact with the Y-shaped pressure plate 10, which plays a point support role, effectively eliminating interference and compressing the clamping state, and ensuring that the required processing accuracy is achieved after the fork 1 is processed.

[0034] A method for using a clamp to ensure that a shift fork does not deform, firstly, the bottom surface of the shift fork 1 is milled flat to ensure that the bottom surface is of uniform standard, then the shift fork 1 is turned over and placed on a bottom plate 4, and is positioned and limited by a positioning block 31 and a positioning column 16, wherein the positioning column 16 uses a V-shaped limit block 17 to ensure that the thickness of the outer circle of the shift fork head 11 is symmetrically distributed, and then the first clamping component 2, the second extrusion component 3 and the Y-type pressing plate 10 are locked, and the Y-type pressing plate 10 is used to symmetrically press the shift fork head 11 at a close distance to ensure the drilling accuracy, and the first pressing plate 23 and the second pressing plate 32 are used to symmetrically press the shift fork arm on one side of the shift fork clamping opening 13 at a close distance to ensure the parallelism of the milling surface.

[0035] In this embodiment, compared with conventional clamping, by milling the bottom surface of the fork 1, the fork 1 has a complete unified reference surface as support after the previous process is completed, and there is no inconsistent reference phenomenon, which ensures the uniqueness of the clamping and the stability of mass production. Even if the external dimensions of the fork are unstable after forging, it can still play a good clamping role. The first clamping component 2, the second extrusion component 3 and the Y-shaped pressure plate 10 are used for precise clamping to improve the limit and stability, firmness and verticality of the clamping, increase the rigidity, effectively avoid vibration marks caused by the vibration knife, reduce the knife letting phenomenon, achieve the uniformity of the clamping reference, and the fulcrum and pressure point balancing device method allows the fork 1 to be clamped in a natural state without interference or pressure, effectively ensuring that the fork is not deformed or bent after processing.

[0036] Furthermore, the specific steps are as follows:

[0037] S1: First install the fork 1 on the fixture and mill the bottom surface to ensure that the bottom surface is uniform and standard;

[0038] S2: Turn the fork 1 over and place it on the bottom plate 4, and use the positioning block 31 and the positioning column 16 to position and limit it, wherein the positioning column 16 uses the V-shaped limit block 17 to ensure that the thickness of the outer circle of the fork head 11 is symmetrical and evenly distributed;

[0039] S3: Check whether the small bosses 18 of all the pressure plates and the corresponding fulcrums meet the use requirements. If there is a damaged side that cannot be used, it must be maintained and replaced;

[0040] S4: Check whether the fork meets the normal processing requirements. If there are forging cracks, pores, severe deformation and other forging defects, the forging side cannot be processed;

[0041] S5: Tighten the locking nut 22 of the first clamping assembly 2, and then tighten the locking nut 22 of the second extrusion assembly, so that the first pressing plate 23 and the second pressing plate 32 press the two ends of the fork arm 12 on one side of the fork locking opening 13;

[0042] S6: Tighten the locking nut 22 on the locking screw 9, and use the Y-shaped pressing plate 10 to press the shift fork 1 over a large area, so as to respectively lock and fix the positions of the shift fork 1 that need to be processed.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A clamp for ensuring that the shift fork does not deform, characterized in that: The invention comprises a base plate (4), support plates (5) are respectively provided on both sides of the base plate (4), a first pressing assembly (2) for pressing one end of a shift fork (1) is provided on one side of each support plate (5), a second extrusion assembly (3) for simultaneously pressing two shift forks (1) is provided in the middle of the base plate (4), two symmetrically arranged positioning columns (16) are provided above the base plate (4), a locking screw (9) is provided on the base plate (4) below the positioning columns (16), a Y-shaped pressing plate (10) for pressing the shift fork (1) is provided on the locking screw (9), one end of the Y-shaped pressing plate (10) is in contact with the shift fork (1), a positioning plate (7) is provided below the other end of the Y-shaped pressing plate (10), a support column (8) is provided on the positioning plate (7), the support column (8) is in contact with the Y-shaped pressing plate (10), and a locking nut (22) is provided on the locking screw (9).

2. A clamp for ensuring that the shift fork does not deform according to claim 1, characterized in that: The first clamping assembly (2) comprises a first clamping plate (23), a first screw rod (21) and a locking nut (22); the lower end of the first screw rod (21) is connected to the base plate (4); the first clamping plate (23) is sleeved on the first screw rod (21); the locking nut (22) is installed on the first screw rod (21); and the two sides of the first clamping plate (23) are respectively clamped on the support plate (5) and the shift fork (1).

3. A clamp for ensuring that the shift fork does not deform according to claim 2, characterized in that: The second extrusion assembly (3) comprises a positioning block (31), a second pressure plate (32), a second screw rod (33) and a locking nut (22); the positioning block (31) is mounted at the middle position of the base plate (4); the lower end of the second screw rod (33) is mounted on the positioning block (31); the second pressure plate (32) is sleeved on the second screw rod (33); the locking nut (22) is mounted on the second screw rod (33); and both sides of the second pressure plate (32) are respectively pressed against the shift forks (1) on both sides.

4. A clamp for ensuring that the shift fork does not deform according to claim 1, characterized in that: Small bosses (18) are provided on both sides of the bottom of the first pressing plate (23) and the second pressing plate (32), and a supporting groove (6) adapted to the small bosses (18) is provided on the supporting plate (5).

5. A clamp for ensuring that the shift fork does not deform according to claim 1, characterized in that: The positioning column (16) is provided with two limit blocks (17) arranged in a V shape, and the inner wall angle of the two limit blocks (17) is 60° to 80°.

6. A clamp for ensuring that the shift fork does not deform according to claim 1, characterized in that: A spherical support block (15) with a hemispherical structure is provided on the top of the support column (8), and the spherical support block (15) is in point contact with the Y-shaped pressing plate (10).

7. A method for using a clamp to ensure that a shift fork does not deform, characterized in that: First, the bottom surface of the shift fork (1) is milled flat to ensure that the bottom surface is uniformly standard. Then, the shift fork (1) is turned over and placed on the bottom plate (4). The shift fork (1) is positioned and limited by the positioning block (31) and the positioning column (16). The positioning column (16) uses the V-shaped limit block (17) to ensure that the thickness of the outer circle of the shift fork head (11) is symmetrically distributed. Then, the first pressing component (2), the second extrusion component (3) and the Y-shaped pressing plate (10) are locked. The shift fork head (11) is symmetrically pressed by the Y-shaped pressing plate (10) at a close distance to ensure the drilling accuracy. The shift fork arm on one side of the shift fork clamping opening (13) is symmetrically pressed by the first pressing plate (23) and the second pressing plate (32) to ensure the parallelism of the milling surface.

8. A method for using a clamp to ensure that a shift fork does not deform according to claim 1, characterized in that: The specific steps are as follows: S1: First, install the shift fork (1) on the fixture and mill the bottom surface to ensure that the bottom surface is uniform and standard; S2: Turn the shift fork (1) over and place it on the bottom plate (4), and use the positioning block (31) and the positioning column (16) to position and limit it, wherein the positioning column (16) uses the limiting block (17) arranged in a V shape to ensure that the thickness of the outer circle of the shift fork head (11) is symmetrical and evenly distributed; S3: Check whether the small bosses (18) of all the pressure plates and the corresponding fulcrums meet the use requirements. If there is a damaged side that cannot be used, it must be maintained and replaced; S4: Check whether the fork meets the normal processing requirements. If there are forging cracks, pores, severe deformation and other forging defects, the forging side cannot be processed; S5: tightening the locking nut (22) of the first pressing assembly (2), and then tightening the locking nut (22) of the second extrusion assembly, so that the first pressing plate (23) and the second pressing plate (32) press the two ends of the shift fork arm (12) on one side of the shift fork locking opening (13); S6: Tighten the locking nut (22) on the locking screw (9), and use the Y-shaped pressure plate (10) to press the shift fork (1) over a large area, so as to respectively lock and fix the positions of the shift fork (1) that need to be processed.

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