Cylindrical gear pair tooth hobbing processing clamp
The design of the clamping mechanism solves the problem of frequent fixture changes in existing technologies, enabling stable clamping of gears of different models, improving processing efficiency and fixture flexibility, and ensuring gear processing accuracy and interchangeability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINHUA XINHUA GEAR
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-24
AI Technical Summary
Existing hobbing fixtures for cylindrical gears require frequent changes depending on the gear model, resulting in high processing costs, low efficiency, and poor flexibility.
The clamping mechanism includes a spring, an adjusting knob, a pressure ring, an arc-shaped inner support tensioning clamp, and a connecting rod. By adjusting the knob, the pressure ring and the connecting rod push the arc-shaped inner support tensioning clamp to slide in the sliding groove, thereby achieving the inner support tensioning clamping of gears of different models.
The elimination of frequent fixture changes reduces processing costs, saves time and manpower, improves work efficiency, enhances the flexibility and practicality of fixture use, and ensures gear processing accuracy and interchangeability.
Smart Images
Figure CN224543350U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fixtures, and in particular to a fixture for hobbing cylindrical gears. Background Technology
[0002] A gear hobbing fixture is a specialized device used for hobbing cylindrical gears. During the hobbing process, it plays a crucial role in accurately fixing and positioning the gear blank. This fixture typically consists of positioning elements, clamping elements, gear-aligning adjustment elements, and a fixture body. The positioning elements act like precise "rulers," accurately placing the gear blank in a predetermined position based on features such as the gear's inner bore, outer diameter, or end face. The clamping elements act like sturdy "grips," firmly fixing the gear blank with bolts, pressure plates, and other structures to prevent displacement due to cutting forces during machining. The gear-aligning adjustment elements act as "adjusters," ensuring correct gear meshing and adjusting the gear blank's mounting angle to match design parameters such as the gear's helix angle and pressure angle. The fixture body serves as a "base," connecting all components and fixing the entire fixture to the hobbing machine's worktable. Using this fixture ensures gear machining accuracy, improves production efficiency, and enables gear interchangeability in mass production, ensuring that the machined gears mesh well with other gears.
[0003] In the existing technology, for the existing cylindrical gear hobbing fixtures, since the size and model of the cylindrical gears to be processed are different, when clamping different models of cylindrical gears for hobbing, the operator needs to change to the corresponding model of the fixture according to the model of the cylindrical gear in order to position and fix the cylindrical gear. This method not only increases the processing cost, but also the frequent disassembly and replacement of the fixture is time-consuming and labor-intensive, thus reducing work efficiency and the flexibility and practicality of the fixture. Utility Model Content
[0004] The main purpose of this utility model is to provide a jig for hobbing cylindrical gears, which can effectively solve the problems in the background art.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A hobbing fixture for cylindrical gears includes a cylindrical gear blank and a fixture base. The top surface of the cylindrical gear blank has a central hole. The cylindrical gear blank is fixedly connected to the top surface of the fixture base by a clamping mechanism, which includes a spring, an adjusting knob, a pressure ring, an arc-shaped inner support tensioning plate, and a connecting rod. The spring is sleeved on the outside of a threaded short rod on the top surface of the fixture base, and the pressure ring is fixedly connected to the top of the spring. The adjusting knob is movably connected to the pressure ring through a convex rotating ring on the bottom surface. The arc-shaped inner support tensioning plate is movably connected to the top surface of the fixture base through a T-shaped sliding block on the bottom surface, and the connecting rod is movably connected between the arc-shaped inner support tensioning plate and the pressure ring through rotating rods at both ends.
[0006] Preferably, the top surface of the clamp seat has three T-shaped sliding grooves arranged in a circular array.
[0007] Preferably, the threaded short rod is fixedly installed at the center of the top surface of the clamp seat, and the top surface of the adjusting knob is provided with a threaded hole. The adjusting knob is threadedly connected to the threaded short rod through the threaded hole, and a convex rotating ring is fixedly installed on the bottom surface of the adjusting knob.
[0008] Preferably, the pressure ring is fitted onto the outside of the threaded short rod, and a convex annular groove is formed on the top surface of the pressure ring. The convex rotating ring is movably installed in the convex annular groove. The spring is fitted onto the outside of the threaded short rod, and the spring is also fixedly installed between the opposite walls of the clamp seat and the pressure ring.
[0009] Preferably, a T-shaped sliding block is fixedly installed on the bottom surface of the arc-shaped inner support tensioning clamp, and the T-shaped sliding block is movably installed in the T-shaped sliding groove. Corresponding concave blocks are fixedly installed on the inner wall of the arc-shaped inner support tensioning clamp and the outer wall of the pressure ring, and rotating holes are respectively opened on both sides of the concave block's concave inner wall.
[0010] Preferably, a set of symmetrical rotating rods are fixedly installed at the upper and lower ends of the connecting rod, and the rotating rods are movably installed in the rotating hole.
[0011] Compared with the prior art, the present invention has the following beneficial effects: In this invention, the clamping mechanism, through the cooperation of components such as springs, adjusting knobs, pressure rings, arc-shaped inner support tensioning plates, and connecting rods, utilizes the rotation of the adjusting knob on the threaded short rod to drive the pressure ring to move. This, in turn, pushes the arc-shaped inner support tensioning plates to slide within the T-shaped sliding groove via the connecting rod. This achieves inner support tensioning clamping of cylindrical gear blanks of different sizes and models, eliminating the need for frequent fixture changes based on gear model. This effectively reduces processing costs, avoids the tedious operation of disassembling and changing fixtures, greatly saves time and manpower, and significantly improves work efficiency. Simultaneously, it enhances the flexibility and practicality of the fixture, ensuring precise fixing and positioning of gear blanks during gear hobbing, guaranteeing gear processing accuracy, achieving gear interchangeability in mass production, and enabling the processed gears to mesh well with other gears. Attached Figure Description
[0012] Figure 1 This is a top view of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a schematic diagram of the overall structure of the cylindrical gear blank of this utility model; Figure 4 This is a schematic diagram of the overall structure of the clamp base of this utility model; Figure 5 This is a structural breakdown diagram of the clamping mechanism of this utility model.
[0013] In the diagram: 1. Cylindrical gear blank; 2. Center hole; 3. Fixture seat; 4. Clamping mechanism; 5. Threaded short rod; 6. T-shaped sliding groove; 7. Spring; 8. Adjusting knob; 9. Threaded hole; 10. Convex rotating ring; 11. Pressure ring; 12. Convex ring groove; 13. Arc-shaped inner support tensioning clamp; 14. T-shaped sliding block; 15. Concave block; 16. Rotating hole; 17. Connecting rod; 18. Rotating rod. Detailed Implementation
[0014] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.
[0015] like Figure 1 - Figure 5As shown, a gear hobbing fixture for cylindrical gears includes a cylindrical gear blank 1 and a fixture base 3. The top surface of the cylindrical gear blank 1 has a central hole 2. The cylindrical gear blank 1 is fixedly connected to the top surface of the fixture base 3 by a clamping mechanism 4. The clamping mechanism 4 includes a spring 7, an adjusting knob 8, a pressure ring 11, an arc-shaped inner support tensioning plate 13, and a connecting rod 17. The spring 7 is sleeved on the outside of the threaded short rod 5 on the top surface of the fixture base 3, and the pressure ring 11 is fixedly connected to the top of the spring 7. The adjusting knob 8 is movably connected to the pressure ring 11 through a convex rotating ring 10 on the bottom surface. The arc-shaped inner support tensioning plate 13 is movably connected to the top surface of the fixture base 3 through a T-shaped sliding block 14 on the bottom surface, and the connecting rod 17 is movably connected between the arc-shaped inner support tensioning plate 13 and the pressure ring 11 through rotating rods 18 at both ends.
[0016] like Figure 4 As shown, the top surface of the clamping base 3 has three T-shaped sliding grooves 6 arranged in a ring array. The special shape of the T-shaped sliding grooves 6 can restrict the movement direction of the T-shaped sliding block 14 on the bottom surface of the arc-shaped inner support tensioning clamping plate 13, so that it can only move in a straight line along the direction of the groove. This realizes the stable and orderly movement of the arc-shaped inner support tensioning clamping plate 13 on the top surface of the clamping base 3, which provides a basis for the subsequent clamping of cylindrical gear blanks 1 of different sizes and models, and ensures the stability and accuracy of the clamping process. like Figure 4 and Figure 5 As shown, the threaded short rod 5 is fixedly installed at the center of the top surface of the clamping seat 3, and the top surface of the adjusting knob 8 is provided with a threaded hole 9. The adjusting knob 8 is threadedly connected to the threaded short rod 5 through the threaded hole 9, and a convex rotating ring 10 is fixedly installed on the bottom surface of the adjusting knob 8. When the adjusting knob 8 is rotated, due to the interaction of the threads, the adjusting knob 8 will move up and down on the threaded short rod 5. At the same time, the convex rotating ring 10 fixedly installed on the bottom surface of the adjusting knob 8 provides a structural basis for the subsequent movable connection with the pressure ring 11, so that the operator can precisely control its position on the threaded short rod 5 by rotating the adjusting knob 8, thereby providing power for the subsequent movement of the pressure ring 11, realizing the initial adjustment of the clamping force, and improving the operability and adjustment accuracy of the clamp. like Figure 4 and Figure 5As shown, the pressure ring 11 is fitted onto the outside of the threaded short rod 5, and a convex annular groove 12 is provided on the top surface of the pressure ring 11. The convex rotating ring 10 is movably installed in the convex annular groove 12. The spring 7 is fitted onto the outside of the threaded short rod 5, and the spring 7 is also fixedly installed between the opposite walls of the clamping seat 3 and the pressure ring 11. When the adjusting knob 8 moves downward to push the pressure ring 11, the spring 7 is compressed and generates elastic force. When the adjusting knob 8 moves upward, the elastic force of the spring 7 pushes the pressure ring 11 upward, realizing the stable movement and reset function of the pressure ring 11. The presence of the spring 7 not only plays a buffering role, but also automatically adjusts the clamping force to a certain extent, making the clamping process more stable, reducing the damage to the cylindrical gear blank 1 caused by excessive or insufficient clamping force, and improving the reliability and adaptability of the clamp. like Figure 4 and Figure 5 As shown, a T-shaped sliding block 14 is fixedly installed on the bottom surface of the arc-shaped inner support tensioning clamp 13, and the T-shaped sliding block 14 is movably installed in the T-shaped sliding groove 6. Corresponding concave blocks 15 are fixedly installed on the inner wall of the arc-shaped inner support tensioning clamp 13 and the outer wall of the pressure ring 11, and rotating holes 16 are respectively opened on both sides of the concave inner wall of the concave block 15, ensuring that the arc-shaped inner support tensioning clamp 13 can move synchronously with the movement of the pressure ring 11. At the same time, the rotating rods 18 at both ends of the connecting rod 17 rotate in the rotating holes 16, realizing the smooth movement and angle adjustment of the arc-shaped inner support tensioning clamp 13, so that the arc-shaped inner support tensioning clamp 13 can better fit the inner wall of the cylindrical gear blank 1 of different sizes and models, improving the stability and adaptability of clamping. like Figure 4 and Figure 5 As shown, a set of symmetrical rotating rods 18 are fixedly installed at the upper and lower ends of the connecting rod 17, and the rotating rods 18 are movably installed in the rotating hole 16. When the pressure ring 11 moves, it will drive the arc-shaped inner support tensioning clamp 13 to move through the connecting rod 17. Since the rotating rods 18 can rotate in the rotating hole 16, the connecting rod 17 can adapt to the relative position change between the pressure ring 11 and the arc-shaped inner support tensioning clamp 13, thereby realizing reliable clamping of cylindrical gear blanks 1 of different sizes and models, and improving the versatility and clamping accuracy of the fixture.
[0017] The specific operating principle of this cylindrical gear hobbing fixture is as follows: The cylindrical gear blank 1 to be processed is placed on the top surface of the fixture 3, and the threaded short rod 5 on the top surface of the fixture 3 and the arc-shaped inner support tensioning plates 13 on the three sides of the threaded short rod 5 pass through the center hole 2 opened on the top surface of the cylindrical gear blank 1. The adjusting knob 8 located on the threaded short rod 5 is rotated. The adjusting knob 8 will rotate and move downward along the thread of the threaded short rod 5 through the threaded hole 9 opened on the top surface. The convex rotating ring 10 installed on the bottom surface of the adjusting knob 8 will rotate in the convex ring groove 12 opened on the top surface of the pressure ring 11. During the rotation, the convex rotating ring 10 pushes the pressure ring 11 downward along the threaded short rod 5. As the pressure ring 11 moves downward, This forces the spring 7, which is fitted outside the threaded short rod 5 and installed between the clamp seat 3 and the pressure ring 11, to tighten. At this time, the symmetrical rotating rods 18 installed at the upper and lower ends of the connecting rod 17 will rotate in the rotating holes 16 opened on both sides of the inner wall of the corresponding concave blocks 15 installed on the inner side wall of the arc-shaped inner support tensioning clamp 13 and the outer wall of the pressure ring 11, respectively. The connecting rod 17 will tilt, and the angle formed between the connecting rod 17 and the threaded short rod 5 will gradually increase. During this change, the arc-shaped inner support tensioning clamp 13 will be pushed outward, causing the arc-shaped inner support tensioning clamp 13 to move on the top surface of the clamp seat 3, and the arc-shaped inner support tensioning clamp 13 will move outward. The T-shaped sliding block 14 installed on the bottom surface of the clamping plate 13 will slide within the T-shaped sliding groove 6 opened on the top surface of the fixture seat 3 until the outer wall of the arc-shaped inner support tensioning clamping plate 13 presses against the inner wall of the center hole 2 opened on the cylindrical gear blank 1, so that the pressure ring 11 can no longer rotate. The cylindrical gear blank 1 can then be quickly positioned, clamped and fixed on the top surface of the fixture seat 3 by the inner support tensioning method. After the cylindrical gear blank 1 has completed the gear hobbing process, the adjusting knob 8 is rotated in the opposite direction to move it upward and no longer squeeze the pressure ring 11. The pressure ring 11 will move upward under the elastic restoring force of the spring 7, and during the movement, it will drive the arc-shaped inner support tensioning clamping plate 13 to move inward through the connecting rod 17. After the cylindrical gear blank 1 is moved so that it is no longer clamped and fixed on the fixture seat 3 by the arc-shaped inner support tensioning clamp 13, the machined fixture seat 3 can be removed from the top surface of the fixture seat 3. Then, by adjusting the moving distance of the arc-shaped inner support tensioning clamp 13, the inner support tensioning clamping of cylindrical gear blanks 1 of different sizes can be achieved. There is no need for the staff to frequently change the fixture according to the model of the cylindrical gear blank 1, which effectively reduces the processing cost, avoids the tedious operation of disassembling and changing the fixture, greatly saves time and manpower, significantly improves work efficiency, and enhances the flexibility and practicality of the fixture, ensuring that the cylindrical gear blank 1 can be accurately fixed and positioned in gear hobbing.
[0018] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.
Claims
1. A hobbing fixture for cylindrical gears, comprising a cylindrical gear blank (1) and a fixture base (3), wherein a center hole (2) is formed on the top surface of the cylindrical gear blank (1), characterized in that: The cylindrical gear blank (1) is fixedly connected to the top surface of the fixture seat (3) by the clamping mechanism (4), and the clamping mechanism (4) includes a spring (7), an adjusting knob (8), a pressure ring (11), an arc-shaped inner support tensioning plate (13) and a connecting rod (17). The spring (7) is sleeved on the outside of the threaded short rod (5) on the top surface of the fixture seat (3), and the pressure ring (11) is fixedly connected to the top of the spring (7). The adjusting knob (8) is movably connected to the pressure ring (11) through the convex rotating ring (10) on the bottom surface. The arc-shaped inner support tensioning plate (13) is movably connected to the top surface of the fixture seat (3) through the T-shaped sliding block (14) on the bottom surface, and the connecting rod (17) is movably connected between the arc-shaped inner support tensioning plate (13) and the pressure ring (11) through the rotating rods (18) at both ends.
2. The gear hobbing fixture for cylindrical gears according to claim 1, characterized in that: The top surface of the clamp seat (3) is provided with three T-shaped sliding grooves (6) in a ring array.
3. A hobbing fixture for cylindrical gears according to claim 2, characterized in that: The threaded short rod (5) is fixedly installed at the center of the top surface of the clamp seat (3), and the top surface of the adjustment knob (8) is provided with a threaded hole (9). The adjustment knob (8) is threadedly connected to the threaded short rod (5) through the threaded hole (9), and a convex rotating ring (10) is also fixedly installed on the bottom surface of the adjustment knob (8).
4. A hobbing fixture for cylindrical gears according to claim 3, characterized in that: The pressure ring (11) is fitted on the outside of the threaded short rod (5), and a convex ring groove (12) is provided on the top surface of the pressure ring (11). The convex rotating ring (10) is movably installed in the convex ring groove (12). The spring (7) is fitted on the outside of the threaded short rod (5), and the spring (7) is also fixedly installed between the clamp seat (3) and the opposite wall of the pressure ring (11).
5. A hobbing fixture for cylindrical gears according to claim 4, characterized in that: The bottom surface of the arc-shaped inner support tensioning clamp (13) is fixedly installed with a T-shaped sliding block (14), and the T-shaped sliding block (14) is movably installed in the T-shaped sliding groove (6). Corresponding concave blocks (15) are fixedly installed on the inner wall of the arc-shaped inner support tensioning clamp (13) and the outer wall of the pressure ring (11), and rotating holes (16) are respectively opened on both sides of the concave inner wall of the concave block (15).
6. A hobbing fixture for cylindrical gears according to claim 5, characterized in that: A set of symmetrical rotating rods (18) are fixedly installed at the upper and lower ends of the connecting rod (17), and the rotating rods (18) are movably installed in the rotating hole (16).