Fixture for finish turning of worm gear
By designing a fixture for precision turning of worm gears, and utilizing a three-point clamping and sliding groove structure, the problem of unstable clamping during worm gear movement was solved, thereby improving the stability and precision of worm gear machining.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU D-MAX PRECISION DRIVE CO LTD
- Filing Date
- 2025-04-24
- Publication Date
- 2026-05-12
AI Technical Summary
During worm gear machining, the worm gear cannot maintain stable clamping when it needs to move, resulting in unstable machining.
A fixture for precision turning of worm gears was designed, including a mounting base, a centering shaft, a drive cylinder, and fixture components. The fixture ensures stable clamping of the worm gear during movement through a three-point clamping and sliding groove structure.
This achieves stable clamping of the worm gear during movement, improves machining accuracy and surface quality, and ensures good meshing between the worm gear and the worm.
Smart Images
Figure CN224223268U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of worm gear machining technology, and in particular to a fixture for precision turning of worm gears. Background Technology
[0002] Worm gear finishing is a process in worm gear finishing lathes that primarily improves the accuracy and surface quality of the worm gear, ensuring good meshing with the worm. During finishing, the worm gear blank is securely clamped, the tool is aligned with the workpiece center, preliminary cutting is performed to remove most of the excess material for rough machining, further cutting is performed to approach the final dimensions, and finally, fine cutting is performed to achieve the dimensions and surface roughness required by the drawing.
[0003] In the prior art, such as the patent with publication number CN206811573U, a lathe fixture for precision machining of worm gear shafts is disclosed, including a drive device and a pull rod connected to the drive device at the left end. A fixture body is provided on the right side of the pull rod, and a bolt connected to the pull rod is provided at the right end of the pull rod. A tip connected to the bolt is provided at the right end of the bolt. The tip is located in the fixture body and moves left and right in the fixture body. When the tip moves to the left end of the fixture body, the left end of the tip abuts against the inner wall of the left end of the fixture body.
[0004] The above structure improves the centering accuracy by fixing the left and right stroke of the center with the fixture body. However, during the machining of the worm gear, the worm gear needs to move, and it is impossible to maintain the stability of the clamping of the worm gear during the movement. Utility Model Content
[0005] In view of this, the purpose of this utility model is to propose a fixture for precision turning of worm gears, so as to solve the problem that the worm gear needs to move during the machining process and it is impossible to maintain the clamping stability of the worm gear during the movement.
[0006] To achieve the above objectives, this utility model provides a fixture for precision turning of worm gears, including a mounting base. The mounting base has a centering shaft for connecting the worm gear inside. One end of the centering shaft is detachably mounted with a stepped shaft. A drive cylinder is fixedly mounted inside the mounting base, and the output end of the drive cylinder is fixedly connected to the other end of the stepped shaft. A sliding groove is provided on the top of the mounting base, and a rod is slidably mounted inside the groove. A clamping component is provided on the rod for clamping worm gears of different sizes. A base is fixedly mounted on one side of the mounting base, and the top of the base abuts against the centering shaft.
[0007] Preferably, the clamping component includes a housing slidably mounted on a mounting base. A threaded rod is rotatably mounted inside the housing. A turntable is fixedly mounted outside the threaded rod. Two sets of extension blocks are fixedly mounted outside the turntable. A bent rod is rotatably connected inside each set of extension blocks. A side rod is movably connected to the end of the bent rod. The top of the insertion rod is movably connected to the inside of the side rod. The two sets of side rods are arranged in a mirror symmetrical manner. A transverse hole is opened inside the stepped shaft. The threaded rod passes through the transverse hole, and a nut sleeve is threaded to the bottom end of the threaded rod. A telescopic connecting rod is sleeved outside the nut sleeve. A telescopic bottom rod is fixedly mounted at the end of the telescopic connecting rod. The telescopic bottom rod is slidably mounted inside the base. Engaging blocks are installed at the ends of both the telescopic bottom rod and the side rod.
[0008] Preferably, the end of the centering shaft and one side of the worm gear are equipped with multiple sets of fastening bolts, and at least four sets of fastening bolts are provided.
[0009] Preferably, the bent rod has a V-shaped structure, and the bent rod is arranged opposite to the center of the turntable.
[0010] Preferably, the base has an L-shaped structure, and the interior of the base has sliding holes for the telescopic connecting rod to slide.
[0011] Preferably, a rotary knob is fixedly installed at the top end of the threaded rod.
[0012] The beneficial effects of this utility model are:
[0013] First, the worm gear is rough-machined and semi-finish-machined. After drilling the threaded hole, the centering shaft is connected to the worm gear to ensure the perpendicularity of the mounting end face of the worm gear to the center line of the centering shaft. Then, the other end of the centering shaft is fixedly connected to the stepped shaft. The worm gears of different sizes are clamped at three points using a fixture. When the worm gear needs to be finished after clamping, the centering shaft at the end of the stepped shaft is moved by the drive cylinder. During the movement, the centering shaft slides on the base, thereby driving the fixture on the insert rod to move inside the slide groove, thus maintaining the stability of the worm gear clamping during the movement. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a three-dimensional structural diagram of the entire utility model;
[0016] Figure 2This is a top view of the overall structure of this utility model;
[0017] Figure 3 This is a side view of the overall structure of this utility model;
[0018] Figure 4 This is a schematic diagram of the installation structure of the stepped shaft and the centering shaft of this utility model;
[0019] Figure 5 This is a schematic diagram of the connection structure between the turntable and the threaded rod of this utility model.
[0020] The markings in the diagram are as follows: 1. Mounting base; 2. Centering shaft; 3. Drive cylinder; 4. Stepped shaft; 5. Horizontal hole; 6. Threaded rod; 7. Nut sleeve; 8. Telescopic connecting rod; 9. Telescopic base rod; 10. Base; 11. Turntable; 12. Extension block; 13. Bent rod; 14. Side rod; 15. Engaging block; 16. Fastening bolt; 17. Rotary knob; 18. Insert rod; 19. Slide groove; 20. Housing. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.
[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a fixture for precision turning of worm gears includes a mounting base 1. A centering shaft 2 for connecting the worm gear is disposed inside the mounting base 1. A stepped shaft 4 is detachably mounted on one end of the centering shaft 2. A drive cylinder 3 is fixedly mounted inside the mounting base 1, and the output end of the drive cylinder 3 is fixedly connected to the other end of the stepped shaft 4. A sliding groove 19 is provided on the top of the mounting base 1. A rod 18 is slidably mounted inside the sliding groove 19, and a clamping component is provided on the rod 18 for clamping worm gears of different sizes. A base 10 is fixedly mounted on one side of the mounting base 1, and the top end of the base 10 abuts against the centering shaft 2.
[0023] In this embodiment, the worm gear is first rough-machined and semi-finish-machined, and after the threaded hole is drilled, the centering shaft 2 is connected to the worm gear to ensure the perpendicularity of the mounting end face of the worm gear to the center line of the centering shaft 2. Then, the other end of the centering shaft 2 is fixedly connected to the stepped shaft 4. The worm gears of different sizes are clamped at three points using a clamping device. When the worm gear needs to be finished after clamping, the centering shaft 2 at the end of the stepped shaft 4 is moved by the drive cylinder 3. During the movement, the centering shaft 2 slides on the base 10, thereby driving the clamping device on the insert rod 18 to move inside the slide groove 19, thus maintaining the stability of the worm gear clamping during the movement.
[0024] As one implementation method, such as Figure 1 , Figure 2 and Figure 4 As shown, the fixture includes a housing 20 slidably mounted on the mounting base 1. A threaded rod 6 is rotatably mounted inside the housing 20. A turntable 11 is fixedly mounted outside the threaded rod 6. Two sets of extension blocks 12 are fixedly mounted outside the turntable 11. A bent rod 13 is rotatably connected inside each of the two sets of extension blocks 12. A side rod 14 is movably connected to the end of the bent rod 13. The top of the insertion rod 18 is movably connected to the inside of the side rod 14. The two sets of side rods 14 are arranged in a mirror symmetrical manner. A transverse hole 5 is opened inside the stepped shaft 4. The threaded rod 6 passes through the inside of the transverse hole 5. A nut sleeve 7 is threadedly connected to the bottom end of the threaded rod 6. A telescopic connecting rod 8 is sleeved on the outside of the nut sleeve 7. A telescopic bottom rod 9 is fixedly mounted at the end of the telescopic connecting rod 8. The telescopic bottom rod 9 is slidably mounted inside the base 10. Engaging blocks 15 are installed at the ends of both the telescopic bottom rod 9 and the side rod 14.
[0025] In this embodiment, rotating the rotary knob 17 drives the threaded rod 6 to rotate, and the turntable 11 outside the threaded rod 6 rotates accordingly. The extension block 12 outside the turntable 11 drives the bent rod 13 to swing. When the bent rod 13 rotates around the center of the turntable 11, the insert rod 18 passes through the side rod 14, and based on the lever principle, it pulls the two sets of side rods 14 to move inward. At the same time, as the threaded rod 6 rotates, the nut sleeve 7 at the bottom rotates, and the nut sleeve 7 moves upward under the engagement of the threaded rod 6, thereby driving the telescopic bottom rod 9 upward and engaging with the two sets of side rods 14. The telescopic bottom rod 9 and the meshing block 15 at the ends of the two sets of side rods 14 are used to clamp the outside of the worm gear in a three-point manner, so as to achieve the purpose of clamping worm gears of different sizes.
[0026] As one implementation method, such as Figure 1 , Figure 2 and Figure 4 As shown, multiple sets of fastening bolts 16 are installed at the end of the centering shaft 2 and on one side of the worm gear, with at least four sets of fastening bolts 16.
[0027] In this embodiment, after the worm gear is rough-machined and semi-finish-machined, the threaded hole is drilled, and the centering shaft 2 is connected to the worm gear through the fastening bolt 16 to make a preliminary connection, so as to ensure the perpendicularity of the mounting end face of the worm gear to the center line of the centering shaft 2.
[0028] As one implementation method, such as Figure 5 As shown, the bent rod 13 has a V-shaped structure and is arranged opposite to the center of the turntable 11.
[0029] In this embodiment, when the turntable 11 rotates and drives the bent rod 13 on the extension block 12 to move, the bent rod 13 moves, and due to the V-shaped setting, the side rod 14 at the end of the bent rod 13 can be stretched to the maximum extent, thereby driving the side rod 14 to clamp worm gears of different sizes.
[0030] As one implementation method, such as Figure 1 As shown, the base 10 has an L-shaped structure, and the interior of the base 10 has a sliding hole for the telescopic connecting rod 8 to slide.
[0031] In this embodiment, the base 10 is fixedly installed with the mounting base 1 through the L-shaped structure. When the centering shaft 2 moves, the centering shaft 2 slides on the top of the base 10 and cooperates with the clamp to further maintain the stability of the movement process of the centering shaft 2.
[0032] As one implementation method, such as Figure 1 As shown, a rotary knob 17 is fixedly installed at the top of the threaded rod 6.
[0033] In this embodiment, rotating the rotary knob 17 drives the threaded rod 6 to rotate, and the turntable 11 outside the threaded rod 6 rotates accordingly, pulling the two sets of side rods 14 to move inward. At the same time, the bottom end of the threaded rod 6 drives the telescopic bottom rod 9 to move, and the telescopic bottom rod 9 and the end engagement block 15 of the side rods 14 clamp each other, so that the worm gear can be directly clamped by rotating the rotary knob 17.
[0034] Working principle: When in use, the worm gear is first rough-machined and semi-finish-machined, and the threaded hole is drilled. Then, the centering shaft 2 is connected to the worm gear through the fastening bolt 16 to ensure the perpendicularity of the mounting end face of the worm gear to the center line of the centering shaft 2. Then, the other end of the centering shaft 2 is fixedly connected to the stepped shaft 4.
[0035] Rotating the knob 17 drives the threaded rod 6 to rotate, causing the turntable 11 outside the threaded rod 6 to rotate accordingly. The extension block 12 outside the turntable 11 drives the bent rod 13 to swing. When the bent rod 13 rotates around the center of the turntable 11, the insert rod 18 passes through the side rod 14, pulling the two sets of side rods 14 inward based on the lever principle. At the same time, the nut sleeve 7 at the bottom of the threaded rod 6 rotates, and the nut sleeve 7 moves upward under the engagement of the threaded rod 6, thereby driving the telescopic bottom rod 9 upward and engaging with the two sets of side rods 14. The telescopic bottom rod 9 and the two sets of side rods 14 are then engaged. The meshing block 15 at the end of the 4 clamps the worm gear at three points to achieve the purpose of clamping worm gears of different sizes. When the worm gear needs to be precision machined after clamping, the centering shaft 2 at the end of the stepped shaft 4 is moved by the drive cylinder 3. During the movement, the centering shaft 2 slides on the base 10. At the same time, due to the transverse hole 5 opened in the stepped shaft 4, the housing 20 is pulled to move, thereby driving the side rod 14 and the insertion rod 18 to move inside the slide groove 19. At the same time, the telescopic linkage 8 is telescopic, thereby maintaining the stability of clamping the worm gear during the movement.
[0036] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.
[0037] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A fixture for precision turning of a worm gear, comprising a mounting base (1), wherein a centering shaft (2) for connecting the worm gear is disposed inside the mounting base (1), characterized in that, One end of the centering shaft (2) is detachably mounted with a stepped shaft (4), and a drive cylinder (3) is fixedly mounted inside the mounting base (1). The output end of the drive cylinder (3) is fixedly connected to the other end of the stepped shaft (4). A sliding groove (19) is provided on the top of the mounting base (1). A plug rod (18) is slidably mounted inside the sliding groove (19). A clamp is provided on the plug rod (18). The clamp is used to clamp worm gears of different sizes. A base (10) is fixedly mounted on one side of the mounting base (1), and the top end of the base (10) abuts against the centering shaft (2).
2. The fixture for precision turning of a worm gear according to claim 1, characterized in that, The clamping component includes a housing (20) slidably mounted on a mounting base (1), a threaded rod (6) rotatably mounted inside the housing (20), a turntable (11) fixedly mounted outside the threaded rod (6), two sets of extension blocks (12) fixedly mounted outside the turntable (11), a bent rod (13) rotatably connected inside each of the two sets of extension blocks (12), a side rod (14) movably connected to the end of the bent rod (13), and the top of the insertion rod (18) movably connected to the inside of the side rod (14). The two sets of side rods (14) are arranged in a mirror symmetrical manner. The stepped shaft (4) has a transverse hole (5) inside. The threaded rod (6) passes through the transverse hole (5) and the bottom end of the threaded rod (6) is threaded with a nut sleeve (7). The nut sleeve (7) is sleeved with a telescopic connecting rod (8). The end of the telescopic connecting rod (8) is fixedly installed with a telescopic bottom rod (9). The telescopic bottom rod (9) is slidably installed in the base (10). The ends of the telescopic bottom rod (9) and the side rod (14) are both equipped with engagement blocks (15).
3. The fixture for precision turning of a worm gear according to claim 1, characterized in that, The end of the centering shaft (2) and one side of the worm gear are equipped with multiple sets of fastening bolts (16), and at least four sets of fastening bolts (16) are provided.
4. A fixture for precision turning of a worm gear according to claim 2, characterized in that, The bent rod (13) has a V-shaped structure and is arranged opposite to the center of the turntable (11).
5. A fixture for precision turning of a worm gear according to claim 1, characterized in that, The base (10) has an L-shaped structure, and the interior of the base (10) has a sliding hole for sliding the telescopic connecting rod (8).
6. A fixture for precision turning of a worm gear according to claim 2, characterized in that, A rotary knob (17) is fixedly installed at the top of the threaded rod (6).