A self-centering tooling for hobbing large gear rings

Abstract

This utility model discloses a self-centering fixture for hobbing large gear rings, including a base plate. An electric push rod is fixedly connected to the upper end of the base plate, and a support plate is fixedly connected to the output end of the electric push rod. A connecting post is in contact with the inner side of the support plate and is fixedly connected to the base plate. A limit ring is fixedly connected to the upper end of the connecting post, and an adjusting rod is threadedly connected to the center of the upper end of the limit ring. A connecting plate is rotatably connected to the adjusting rod. Pressure rods are fixedly connected to the four sides of the bottom end of the connecting plate. The bottom end of the pressure rod has a hemispherical structure and is inserted into the limit ring. L-shaped grooves are opened on the four sides of the limit ring, and movable rods are inserted into the L-shaped grooves. An arc-shaped block is fixedly connected to one end of the movable rod. This utility model provides support for the gear ring by the limit ring and the connecting ring. Then, by rotating the adjusting rod, the pressure rod is pressed down, squeezing the movable rod and the arc-shaped block, thereby causing the contact block to extend and squeeze the inner ring of the gear ring, thus improving the centering speed and the adaptability of the fixture.

Description

Technical Field

[0001] This utility model relates to the field of large gear hobbing technology, specifically to a self-centering tooling for large gear hobbing. Background Technology

[0002] Large gear hobbing is based on the principle of helical gear meshing. The involute tooth profile is formed by the relative movement of the hob and the gear blank. The roller is essentially a helical gear with a large helix angle. Its rotation forms the cutting motion, the workpiece rotates to achieve the tooth splitting motion, and the tool holder moves slowly along the gear shaft to complete the axial feed. Usually, tooling fixtures are needed to locate the center position of the gear ring during gear hobbing.

[0003] According to the Chinese patent publication CN208195850U, "Self-centering fixture for hobbing large gears," the main process involves placing the steel ball at the lowest end of the inclined plane during use. The workpiece is easily fitted onto the outside of the rotating ring. Rotating the handle clockwise causes the rotating ring to rotate, which in turn rotates the limiting groove and the steel ball. Under the action of the inclined plane, the steel ball moves outward, tightening the inner hole of the workpiece. This achieves a gapless fit between the workpiece, the steel ball, and the mandrel, completely eliminating tooling positioning gaps. Then, a clamping device presses the workpiece against the boss, allowing for gear hobbing. After machining, the clamping device is released, and the handle is rotated counterclockwise to return the steel ball to the lowest end of the inclined plane, making it easy to remove the workpiece.

[0004] In common gear hobbing processes, the center point of the gear ring needs to be located before the hobbing is performed. In some cases, the workpiece is fitted onto the outside of a rotating ring, and the workpiece is moved by the cooperation of a limiting groove and a steel ball under the action of an inclined plane, which tightens the inner hole of the workpiece. However, in this case, the tooling fixture can only use a single size gear ring and cannot limit gear rings of multiple sizes, resulting in low adaptability of the tooling fixture. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a self-centering tooling for hobbing large gear rings, thereby improving the adaptability of the tooling fixture and enhancing the limiting effect on gear rings of various sizes.

[0006] The technical solution adopted by this utility model to solve the technical problem is: a self-centering tooling for hobbing large gear rings, including a base plate, an electric push rod fixedly connected to the upper end of the base plate, a support plate fixedly connected to the output end of the electric push rod, a connecting post contacting the inner side of the support plate, the connecting post fixedly connected to the base plate, a limit ring fixedly connected to the upper end of the connecting post, an adjusting rod threadedly connected to the center of the upper end of the limit ring, a connecting plate rotatably connected to the adjusting rod, pressure rods fixedly connected to the four sides of the bottom end of the connecting plate, the bottom end of the pressure rod having a hemispherical structure, the pressure rod inserting into the limit ring, an L-shaped groove opened on the four sides of the limit ring, a movable rod inserted into the L-shaped groove, an arc-shaped block fixedly connected to one end of the movable rod, a spring contacting one side of the arc-shaped block, the spring sleeved on the movable rod, a contact block fixedly connected to the end of the movable rod away from the arc-shaped block, a hidden groove contacting one side of the contact block, the hidden groove being located on the four sides of the limit ring.

[0007] As a preferred technical solution of this utility model, an adaptation groove is provided on the upper side of the limiting ring, and a pad is in contact with the adaptation groove. The pad is fixedly connected to the pressure rod. By setting the adaptation groove and the pad, the stability of the pressure rod moving up and down can be improved.

[0008] As a preferred technical solution of this utility model, a turntable is threadedly connected to the upper side of the adaptation groove, and protrusions are fixedly connected to the four sides of the upper end of the turntable. By setting the turntable, it is easy to open, thereby achieving the effect of disassembling the pressure rod and the adjustment rod.

[0009] As a preferred technical solution of this utility model, the support plate has through holes evenly opened on its four sides, and a positioning rod is inserted into the through hole. The positioning rod is threadedly connected to a connecting ring, and the connecting ring contacts the support plate. By setting the positioning rod and the connecting ring, further support can be provided when the gear ring is thin.

[0010] As a preferred technical solution of this utility model, each of the four mutually distant sides of the support plate is fixedly connected with an extension arm, and the bottom end of the extension arm is fixedly connected with a support column. By setting the extension arm and the support column, the stability of the connecting ring can be improved.

[0011] This utility model has the following advantages: by providing support for the gear ring through the limiting ring and the connecting ring, and then rotating the adjusting rod to press down the pressure rod and squeeze the movable rod and the arc block, the contact block is extended and squeezes the inner ring of the gear ring, thereby improving the centering speed and the adaptability of the fixture. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural schematic diagram of a self-centering tooling for hobbing large gear rings according to a preferred embodiment of the present invention.

[0013] Figure 2 This is a side sectional view of the limiting ring of a self-centering tooling for hobbing large gear rings according to a preferred embodiment of the present invention.

[0014] Figure 3 This is a side view of the connecting ring structure of a self-centering tooling for hobbing large gear rings according to a preferred embodiment of the present invention.

[0015] Explanation of reference numerals in the attached diagram: 1. Base plate; 2. Electric push rod; 3. Support plate; 4. Connecting column; 5. Limiting ring; 6. Adjusting rod; 7. Connecting plate; 8. Pressure rod; 9. L-shaped groove; 10. Movable rod; 11. Arc-shaped block; 12. Spring; 13. Contact block; 14. Hidden groove; 15. Adaptive groove; 16. Pad; 17. Turntable; 18. Connecting ring; 19. Positioning rod; 20. Extension arm; 21. Support column. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Please refer to the following: Figure 1-3 The self-centering fixture for hobbing a large gear ring includes a base plate 1. An electric push rod 2 is fixedly connected to the upper end of the base plate 1. The electric push rod 2 can drive a support plate 3 to move up and down, thereby adjusting the contact position between the inner wall of the gear ring and the contact block 13. The output end of the electric push rod 2 is fixedly connected to the support plate 3. A connecting post 4 contacts the inner side of the support plate 3 and is fixedly connected to the base plate 1. A limit ring 5 is fixedly connected to the upper end of the connecting post 4. The limit ring 5 has a split structure and is connected to each other by bolts. An adjusting rod 6 is threadedly connected to the center of the upper end of the limit ring 5. Rotating the adjusting rod 6 causes the connecting plate 7 to move down, which in turn causes the pressure rod 8 to move down and press the arc-shaped block 11, thereby causing the arc-shaped block 11 to move towards the hidden groove 14 within the L-shaped groove 9, thus causing the contact block 13 to contact the inner wall of the gear ring. The adjusting rod 6 is rotatably connected to... There is a connecting plate 7, and pressure rods 8 are fixedly connected to the four sides of the bottom of the connecting plate 7. The bottom of the pressure rods 8 is hemispherical. The pressure rods 8 are inserted into the limiting rings 5. L-shaped grooves 9 are opened on the four sides of the limiting rings 5. Movable rods 10 are inserted into the L-shaped grooves 9. One end of the movable rods 10 is fixedly connected to an arc-shaped block 11. One side of the arc-shaped block 11 contacts a spring 12. When the arc-shaped block 11 is squeezed by the pressure rods 8, the arc-shaped block 11 moves away from the outer ring of the limiting ring 5. Then the movable rod 10 and the contact block 13 move outward and squeeze the inner wall of the toothed ring, thereby providing a limit. Under normal conditions, the spring 12 extends and moves the arc-shaped block 11 toward the center point of the limiting ring 5. The spring 12 is sleeved on the movable rod 10. The end of the movable rod 10 away from the arc-shaped block 11 is fixedly connected to a contact block 13. One side of the contact block 13 contacts a hidden groove 14. The hidden groove 14 is located on the four sides of the limiting ring 5.

[0018] The upper side of the limiting ring 5 is provided with an adaptation groove 15, and a pad 16 is in contact with the adaptation groove 15. The pad 16 is fixedly connected to the pressure rod 8. By setting the adaptation groove 15 and the pad 16, the stability of the downward movement of the pressure rod 8 can be maintained.

[0019] The upper side of the adaptation groove 15 is threaded with a turntable 17, and the four sides of the upper end of the turntable 17 are fixedly connected with protrusions. By setting the turntable 17 and the protrusions, it is convenient to disassemble and maintain the pressure rod 8 and the adjustment rod 6 in the future.

[0020] The support plate 3 has through holes evenly distributed on its four sides, and a positioning rod 19 is inserted into each through hole. The positioning rod 19 is threadedly connected to a connecting ring 18, which contacts the support plate 3. By setting the positioning rod 19 and the connecting ring 18, a detachable connecting ring 18 is formed, which allows the contact block 13 to contact the inner wall of the gear ring when some gear rings are thin, and improves the adaptability of the gear ring tooling.

[0021] Among them, the four sides of the support plate 3 that are far apart from each other are fixedly connected with extension arms 20, and the bottom end of the extension arms 20 is fixedly connected with a support column 21. By setting the extension arms 20 and the support column 21, the support effect on the gear ring can be improved.

[0022] Working principle: Adjust the electric push rod 2 according to the thickness of the gear ring to move the support plate 3 upward. Then, select the connecting ring 18 of different diameters and limit it with the positioning rod 19. At the same time, ensure that the diameter of the connecting ring 18 is smaller than the diameter of the gear ring. Then, make the height of the gear ring correspond to that of the contact block 13. At the same time, rotate the adjusting rod 6 to make the connecting plate 7 and the pressure rod 8 move downward and squeeze the arc block 11. Then the spring 12 is compressed and the movable rod 10 and the contact block 13 move outward, thereby quickly limiting the gear ring. It can limit gear rings of different diameters and make the center point of the gear ring correspond to the center point of the limiting ring 5, and expose the machining position of the gear ring.

[0023] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

[0024] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A self-centering fixture for hobbing large gear rings, comprising a base plate (1), characterized in that, An electric push rod (2) is fixedly connected to the upper end of the base plate (1). A support plate (3) is fixedly connected to the output end of the electric push rod (2). A connecting column (4) contacts the inner side of the support plate (3). The connecting column (4) is fixedly connected to the base plate (1). A limit ring (5) is fixedly connected to the upper end of the connecting column (4). An adjusting rod (6) is threadedly connected to the center of the upper end of the limit ring (5). A connecting plate (7) is rotatably connected to the adjusting rod (6). Pressure rods (8) are fixedly connected to the four sides of the bottom end of the connecting plate (7). The bottom end of the pressure rod (8) has a hemispherical structure. The pressure rod (8) is inserted into the limiting ring (5). The limiting ring (5) has L-shaped grooves (9) on all four sides. A movable rod (10) is inserted into the L-shaped groove (9). An arc-shaped block (11) is fixedly connected to one end of the movable rod (10). A spring (12) is in contact with one side of the arc-shaped block (11). The spring (12) is sleeved on the movable rod (10). A contact block (13) is fixedly connected to the end of the movable rod (10) away from the arc-shaped block (11). A hidden groove (14) is in contact with one side of the contact block (13). The hidden groove (14) is located on the four sides of the limiting ring (5).

2. The self-centering tooling for hobbing large gear rings as described in claim 1, characterized in that, The upper side of the limiting ring (5) is provided with an adaptation groove (15), and a pad (16) is in contact with the adaptation groove (15). The pad (16) is fixedly connected to the pressure rod (8).

3. The self-centering tooling for hobbing large gear rings as described in claim 2, characterized in that, The upper side of the adaptation groove (15) is threaded with a turntable (17), and the upper end of the turntable (17) is fixedly connected with protrusions on all four sides.

4. The self-centering tooling for hobbing large gear rings as described in claim 1, characterized in that, The support plate (3) has through holes evenly distributed on its four sides, and a positioning rod (19) is inserted into the through hole. The positioning rod (19) is threadedly connected to a connecting ring (18), and the connecting ring (18) is in contact with the support plate (3).

5. The self-centering tooling for hobbing large gear rings as described in claim 4, characterized in that, The support plate (3) has four mutually spaced sides with extension arms (20) fixedly connected to each other, and the bottom end of the extension arm (20) is fixedly connected to a support column (21).

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