Gear expansion sleeve structure

Abstract

The application relates to a gear expansion sleeve structure for coaxially fastening a gear on a connecting shaft, which comprises an inner pressure expansion sleeve, an outer pressure expansion sleeve and adjusting screws, the inner pressure expansion sleeve is axially symmetrically sleeved on the outer surface of the connecting shaft, the inner surface of the inner pressure expansion sleeve is gradually abutted against the outer surface of the connecting shaft; the outer pressure expansion sleeve is axially symmetrically sleeved on the inner diameter of the gear, and the end portion is abutted against the end surface of the gear, the outer surface of the outer pressure expansion sleeve is gradually abutted against the inner surface of the inner pressure expansion sleeve; the adjusting screws are provided with a plurality of end portions penetrating through the inner pressure expansion sleeve and the outer pressure expansion sleeve, and the inner pressure expansion sleeve is axially moved by being extruded through the axial movement of the adjusting screws, and is abutted against the inner surface of the outer pressure expansion sleeve and the outer surface of the connecting shaft, and the outer surface of the outer pressure expansion sleeve is extruded to the inner surface of the gear. The application realizes the stability between the gear and the connecting shaft, makes the component combination force more reasonable, and ensures the stability of the overall structure.

Description

Technical Field

[0001] This application relates to the technical field of expansion sleeves, and in particular to a gear expansion sleeve structure. Background Technology

[0002] The connection between gears and shafts is currently a crucial component in mechanical transmission systems, and its quality directly affects the accuracy, efficiency, and reliability of the transmission. Gear expansion sleeves, as a commonly used connecting component, are widely applied in various transmission devices.

[0003] In gearbox mechanisms, the expansion joint between the shaft and gear often employs a combination of flat keys and interference fits. While widely used, this method still presents several significant problems. First, after repeated disassembly and assembly, flat key connections are prone to reduced alignment accuracy due to keyway wear or deformation, making it difficult to guarantee the concentricity of the gear and shaft and affecting transmission smoothness. Second, the installation and disassembly process is complex, typically requiring auxiliary processes such as heating and cooling, resulting in inconvenient and inefficient operation. Furthermore, machining keyways on the shaft and gear hub weakens the strength of the components and creates stress concentration at the keyway root, making them susceptible to fatigue fracture under alternating loads, severely impacting structural reliability. On the other hand, under vibration or variable load conditions, fretting wear easily occurs on the key-keyway contact surface, increasing the clearance, causing impact and noise, and the resulting wear particles can contaminate the lubrication system, endangering adjacent components such as bearings.

[0004] To address the problems of low positioning accuracy, difficult assembly and disassembly, significant stress concentration, easy wear, and insufficient reliability of existing flat key interference fit tightening methods, a gear tightening sleeve structure is provided to solve the above technical problems. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a gear expansion sleeve structure.

[0006] This application provides a gear expansion sleeve structure, which adopts the following technical solution: A gear expansion sleeve structure for coaxially fastening a gear to a connecting shaft, comprising: An internal pressure expansion sleeve is axially adjustable and fitted onto the outer surface of the connecting shaft, with the inner surface of the internal pressure expansion sleeve abutting against the outer surface of the connecting shaft. An external pressure expansion sleeve is coaxially fitted into the inner hole of the gear, with its end abutting against the end face of the gear. The outer surface of the external pressure expansion sleeve abuts against the inner surface of the internal pressure expansion sleeve. Several adjusting screws are provided, passing through the ends of the inner and outer pressure sleeves. The axial movement of the adjusting screws compresses the inner pressure sleeve to move axially along the connecting shaft, respectively abutting the inner surface of the outer pressure sleeve and the outer surface of the connecting shaft. At the same time, the outer surface of the outer pressure sleeve is driven to compress the inner surface of the gear, so as to fasten the gear and the connecting shaft together.

[0007] By adopting the above technical solution, the inner pressure expansion sleeve is axially symmetrically fitted on the outer surface of the connecting shaft, and the outer pressure expansion sleeve is axially symmetrically fitted on the inner diameter of the gear with its end abutting the gear end face. When the adjusting screw moves axially, it will squeeze the inner pressure expansion sleeve to move axially, so that the inner surface of the inner pressure expansion sleeve gradually abuts against the outer surface of the connecting shaft, and at the same time, the outer surface of the inner pressure expansion sleeve gradually abuts against the inner surface of the outer pressure expansion sleeve, thereby driving the outer surface of the outer pressure expansion sleeve to squeeze the inner surface of the gear. This structure and adjustment method can achieve a tight fastening connection between the gear and the connecting shaft, effectively preventing the gear from loosening or shifting on the connecting shaft, and ensuring the stability and reliability of the transmission between the gear and the connecting shaft.

[0008] Optionally, the inner pressure expansion sleeve includes a first end plate as the end of the inner pressure expansion sleeve and an inner sleeve fixedly connected to the middle of the first end plate. The outer surface of the inner sleeve is provided with a first mating surface. When the inner sleeve moves axially with the first end plate, the outer surface of the inner sleeve presses against the outer pressure expansion sleeve. The inner surface of the inner sleeve is axially arranged and abuts against the outer surface of the connecting shaft.

[0009] By adopting the above technical solution, the inner sleeve of the inner pressure expansion sleeve is fixedly connected to the first end plate. When the adjusting screw drives the first end plate to move axially, the inner sleeve will move axially synchronously with the first end plate. The first mating surface on the outer surface of the inner sleeve can fully contact the outer pressure expansion sleeve and generate a squeezing effect during the axial movement. This squeezing makes the outer pressure expansion sleeve better press against the inner surface of the gear, enhancing the tightness of the connection between the outer pressure expansion sleeve and the gear. At the same time, the inner surface of the inner sleeve is axially set and presses against the outer surface of the connecting shaft, further strengthening the connection between the inner pressure expansion sleeve and the connecting shaft, making the fastening effect between the gear and the connecting shaft better, and ensuring the stability and reliability of power transmission.

[0010] Optionally, the external pressure sleeve includes a second end plate as the end of the external pressure sleeve and an outer sleeve fixedly connected to the middle of the second end plate. The first end plate and the second end plate are in contact with each other. The inner surface of the outer sleeve is provided with a second mating surface. The first mating surface and the second mating surface fit and abut against each other. The outer surface of the outer sleeve abuts against the inner surface of the gear.

[0011] By adopting the above technical solution, the second end plate of the outer pressure expansion sleeve and the first end plate of the inner pressure expansion sleeve are in close contact with each other. When the adjusting screw moves axially to compress the inner pressure expansion sleeve to move axially, the first mating surface of the outer surface of the inner sleeve will fit and abut against the second mating surface of the inner surface of the outer sleeve. This fit and abutment allows the pressure transmitted by the inner pressure expansion sleeve to be evenly applied to the outer sleeve, thereby enabling the outer surface of the outer sleeve to tightly press against the inner surface of the gear. In this way, the connection stability between the outer pressure expansion sleeve and the gear can be enhanced, the fastening effect between the gear and the connecting shaft can be guaranteed, and the loosening or slippage of the gear during operation can be effectively prevented, thereby improving the reliability and working efficiency of the entire gear expansion sleeve structure.

[0012] Optionally, the end face of the inner sleeve and the end face of the outer pressure sleeve are on the same horizontal plane, and a retention gap for separating the inner pressure sleeve and the outer pressure sleeve is provided between the upper outer surface of the inner sleeve and the inner surface of the outer pressure sleeve.

[0013] By adopting the above technical solution, when it is necessary to separate the inner pressure expansion sleeve and the outer pressure expansion sleeve, the reserved gap provides space, avoiding the situation where the ends of the inner sleeve and the outer pressure expansion sleeve are directly and tightly attached and difficult to separate, making the separation operation of the inner pressure expansion sleeve and the outer pressure expansion sleeve more convenient.

[0014] Optionally, it also includes a positioning element for preventing slippage between the first end plate and the second end plate. The positioning element includes a plurality of positioning rods disposed at the bottom of the first end plate and a plurality of positioning holes disposed through the top of the second end plate. The plurality of positioning rods are inserted into the positioning holes one by one.

[0015] By adopting the above technical solution, when the inner and outer pressure expansion sleeves move axially and are compressed under the action of the adjusting screw, the cooperation between the positioning rod and the positioning hole can limit the relative position of the first end plate and the second end plate, avoid slippage between the first and second end plates, ensure the stability of the relative position between the inner and outer pressure expansion sleeves, and thus ensure that the pressing and compression between the outer surface of the inner sleeve and the inner surface of the outer sleeve, the inner surface of the inner sleeve and the outer surface of the connecting shaft, and the outer surface of the outer sleeve and the inner surface of the gear can be stably achieved, making the fastening effect between the gear and the connecting shaft more reliable.

[0016] Optionally, a rubber sleeve is fixedly connected to the inner wall of each of the positioning holes, and the inner wall of the rubber sleeve is in contact with the outer surface of the positioning rod.

[0017] By adopting the above technical solution, and utilizing the elastic properties of the rubber sleeve, when the positioning rod is inserted into the positioning hole, the rubber sleeve will undergo elastic deformation, tightly wrapping the positioning rod and increasing the friction between the positioning rod and the positioning hole. This friction can effectively prevent the positioning rod from shaking or shifting in the positioning hole, thereby preventing slippage between the first end plate and the second end plate, making the connection between the inner pressure expansion sleeve and the outer pressure expansion sleeve more stable, and ensuring the overall stability and reliability of the gear expansion sleeve structure.

[0018] Optionally, it also includes a stabilizing disc sleeved on the outer surface of the connecting shaft. The symmetrically arranged inner and outer pressure expansion sleeves abut against the stabilizing disc between the connecting shaft and the gear. The stabilizing disc is used to combine the forces at both ends of the symmetrically arranged inner and outer pressure expansion sleeves.

[0019] By adopting the above technical solution, when the inner pressure expansion sleeve and the outer pressure expansion sleeve abut against the outer surface of the connecting shaft and the inner surface of the gear respectively and apply pressure, the stabilizing plate can make the symmetrical ends of the symmetrically arranged inner pressure expansion sleeve and outer pressure expansion sleeve combine to bear force, avoiding uneven force at both ends leading to structural instability, enhancing the overall stability and reliability of the gear expansion sleeve structure, and making the connection between the gear and the connecting shaft more secure.

[0020] Optionally, the upper and lower end faces of the stabilizing plate are provided with semi-concave arc surfaces. The outer surface of the semi-concave arc surface abuts against the inner surface of the gear. The bottom end of the outer pressure sleeve is provided with an inclined arc surface corresponding to the semi-concave arc surface. The outer surface of the outer pressure sleeve abuts against the inner surface of the gear while the inclined arc surface abuts against the semi-concave arc surface.

[0021] By adopting the above technical solution, when the adjusting screw presses the outer surface of the external pressure sleeve against the inner surface of the gear, the inclined arc surface will also press against the semi-concave arc surface. In this way, a tighter fit is formed between the external pressure sleeve and the stabilizing plate. The fit between the semi-concave arc surface and the inclined arc surface can increase the contact area and make the force transmission more uniform. On the one hand, it can enhance the squeezing effect of the external pressure sleeve on the inner surface of the gear, further improving the tightness between the gear and the connecting shaft. On the other hand, the stabilizing plate can better disperse the pressure transmitted by the external pressure sleeve, avoiding excessive local pressure that could lead to structural damage. This improves the stability and reliability of the entire gear expansion sleeve structure, ensuring that the connection between the gear and the connecting shaft remains tight during long-term use.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By adjusting the screw, the inner and outer pressure expansion sleeves abut against the connecting shaft and gear respectively, avoiding the loosening problem caused by keyway wear in keyed connections, improving transmission accuracy and stability, and without weakening the strength of the shaft and gear; the adjustment screw is used to press the inner and outer pressure expansion sleeves to achieve fastening, which is simpler to assemble and disassemble than interference fit, without requiring large pressure or special processes, and the connection reliability can be guaranteed even after multiple uses; 2. The stabilizing plate allows the symmetrical inner and outer pressure sleeves to be combined and subjected to force at both ends, improving the stability of the structure. The semi-concave arc surface at the upper and lower end edges of the stabilizing plate abuts against the inclined arc surface of the outer pressure sleeve, which can better cooperate with the outer pressure sleeve to abut against the inner surface of the gear, enhancing the stability of the connection. Attached Figure Description

[0023] Figure 1 This is a three-dimensional view of a gear expansion sleeve structure according to this application.

[0024] Figure 2 This is a front view of a gear expansion sleeve structure according to this application.

[0025] Figure 3 This is a cross-sectional view of a gear expansion sleeve structure according to this application.

[0026] Figure 4 This is a top view of a stabilizing disc of a gear expansion sleeve structure according to this application.

[0027] Figure 5 yes Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0028] Figure 6 yes Figure 3 Enlarged schematic diagram of the structure at point B.

[0029] Figure 7 yes Figure 3 A magnified schematic diagram of the structure at point C.

[0030] In the diagram: 1. Inner pressure expansion sleeve; 11. First end plate; 12. Inner sleeve; 13. First mating surface; 2. Outer pressure expansion sleeve; 21. Second end plate; 22. Outer sleeve; 23. Second mating surface; 24. Inclined arc surface; 3. Adjusting screw; 4. Reservation clearance; 5. Positioning component; 51. Positioning rod; 52. Positioning hole; 53. Rubber sleeve; 6. Stabilizing plate; 61. Semi-concave arc surface; 7. Connecting shaft; 8. Gear. Detailed Implementation

[0031] The following is in conjunction with the accompanying drawings. Figures 1-7 This application will be described in further detail.

[0032] Example 1 refer to Figures 1-6This application discloses a gear expansion sleeve structure for coaxially fastening a gear 8 to a connecting shaft 7, comprising: an inner pressure expansion sleeve 1, an outer pressure expansion sleeve 2, and an adjusting screw 3.

[0033] The inner pressure expansion sleeve 1 is axially adjustable and fitted onto the outer surface of the connecting shaft 7, with the inner surface of the inner pressure expansion sleeve 1 abutting against the outer surface of the connecting shaft 7. The outer pressure expansion sleeve 2 is coaxially fitted into the inner hole of the gear 8, with its end abutting against the end face of the gear 8, and the outer surface of the outer pressure expansion sleeve 2 abutting against the inner surface of the inner pressure expansion sleeve 1. Several adjusting screws 3 are provided, passing through the ends of the inner pressure expansion sleeve 1 and the outer pressure expansion sleeve 2. Several threaded holes are provided through the ends of both the inner pressure expansion sleeve 1 and the outer pressure expansion sleeve 2. Several adjusting screws 3 are threaded into the threaded holes. By adjusting the axial movement of the screws 3, the inner pressure expansion sleeve 1 is squeezed to move axially along the connecting shaft 7, abutting against the inner surface of the outer pressure expansion sleeve 2 and the outer surface of the connecting shaft 7 respectively. At the same time, the outer surface of the outer pressure expansion sleeve 2 is driven to squeeze the inner surface of the gear 8, which is used to fasten the gear 8 and the connecting shaft 7.

[0034] The inner pressure expansion sleeve 1 is axially symmetrically fitted onto the outer surface of the connecting shaft 7, and the outer pressure expansion sleeve 2 is axially symmetrically fitted onto the inner diameter of the gear 8 with its end abutting against the end face of the gear 8. The ends of the inner pressure expansion sleeve 1 and the outer pressure expansion sleeve 2 are threaded through and threadedly connected to the adjusting screw 3. When the adjusting screw 3 moves axially, it will compress the inner pressure expansion sleeve 1 to move axially, so that the inner surface of the inner pressure expansion sleeve 1 gradually abuts against the outer surface of the connecting shaft 7, and at the same time, the outer surface of the inner pressure expansion sleeve 1 gradually abuts against the inner surface of the outer pressure expansion sleeve 2, thereby driving the outer surface of the outer pressure expansion sleeve 2 to compress the inner surface of the gear 8. This structure and adjustment method can achieve a tight fastening connection between the gear 8 and the connecting shaft 7, effectively preventing the gear 8 from loosening or shifting on the connecting shaft 7, and ensuring the stability and reliability of the transmission between the gear 8 and the connecting shaft 7.

[0035] In this embodiment, more specifically, the inner pressure expansion sleeve 1 includes a first end plate 11 serving as the end of the inner pressure expansion sleeve 1 and an inner sleeve 12 fixedly connected to the middle of the first end plate 11. The outer surface of the inner sleeve 12 is provided with a first mating surface 13. When it moves axially with the first end plate 11, the outer surface of the inner sleeve 12 presses against the outer pressure expansion sleeve 2. The inner surface of the inner sleeve 12 is axially positioned and abuts against the outer surface of the connecting shaft 7. The inner sleeve 12 of the inner pressure expansion sleeve 1 is fixedly connected to the first end plate 11. When the adjusting screw 3 drives the first end plate 11 to move axially, the inner sleeve 12 will follow the first end plate. 11. Synchronous axial movement; the first mating surface 13 on the outer surface of the inner sleeve 12 can fully contact the outer pressure expansion sleeve 2 and generate a squeezing effect during axial movement. This squeezing makes the outer pressure expansion sleeve 2 better press against the inner surface of the gear 8, enhancing the tightness of the connection between the outer pressure expansion sleeve 2 and the gear 8. At the same time, the inner surface of the inner sleeve 12 is axially arranged and presses against the outer surface of the connecting shaft 7, further strengthening the connection between the inner pressure expansion sleeve 1 and the connecting shaft 7, making the fastening effect between the gear 8 and the connecting shaft 7 better, and ensuring the stability and reliability of power transmission.

[0036] In this embodiment, more specifically, the external pressure sleeve 2 includes a second end plate 21 as the end of the external pressure sleeve 2 and an outer sleeve 22 fixedly connected to the middle of the second end plate 21. The first end plate 11 and the second end plate 21 are fitted together. The inner surface of the outer sleeve 22 is provided with a second mating surface 23. The first mating surface 13 and the second mating surface 23 fit and abut together. The first mating surface 13 and the second mating surface 23 can be conical surfaces or arc surfaces to increase the tightness of the abutment between the first mating surface 13 and the second mating surface 23. The outer surface of the outer sleeve 22 abuts against the inner surface of the gear 8. The second end plate 21 of the external pressure sleeve 2 and the first end plate 11 of the inner pressure sleeve 1 are fitted together. When the adjusting screw 3 moves axially to compress the inner pressure expansion sleeve 1 to move axially, the first mating surface 13 of the outer surface of the inner sleeve 12 will engage and abut with the second mating surface 23 of the inner surface of the outer sleeve 22. This engagement and abutment allows the pressure transmitted by the inner pressure expansion sleeve 1 to be evenly applied to the outer sleeve 22, thereby enabling the outer surface of the outer sleeve 22 to tightly abut against the inner surface of the gear 8. In this way, the connection stability between the outer pressure expansion sleeve 2 and the gear 8 can be enhanced, ensuring the fastening effect between the gear 8 and the connecting shaft 7, effectively preventing the gear 8 from loosening or slipping during operation, and improving the reliability and working efficiency of the entire gear 8 expansion sleeve structure.

[0037] In this embodiment, more specifically, the end face of the inner sleeve 12 and the end of the outer pressure sleeve 2 are on the same horizontal plane, and a retention gap 4 for separating the inner pressure sleeve 1 and the outer pressure sleeve 2 is provided between the upper outer surface of the inner sleeve 12 and the inner surface of the outer pressure sleeve 2. When it is necessary to separate the inner pressure sleeve 1 and the outer pressure sleeve 2, the retention gap 4 provides space, avoiding the situation where the ends of the inner sleeve 12 and the outer pressure sleeve 2 are directly and tightly attached and difficult to separate, making the separation operation of the inner pressure sleeve 1 and the outer pressure sleeve 2 more convenient.

[0038] To ensure reliable self-locking performance and appropriate mechanical gain, the first mating surface 13 and the second mating surface 23 are made of conical surfaces, with the taper of the conical surfaces preferably between 1:5 and 1:10. Through the wedge-shaped force amplification effect of the conical surfaces, when the adjusting screw 3 applies an axial force F_axial, this force acts on the inclined contact surfaces of the first mating surface 13 and the second mating surface 23. According to the principle of force decomposition, the axial force is decomposed into a normal force F_normal perpendicular to the contact surface and a frictional force F_friction parallel to the contact surface. Among them, the normal force F_normal is further decomposed into a huge radial force F_radial and an axial component force. It is this radial force F_radial, amplified by the wedge structure, that enables the inner pressure sleeve 1 to generate sufficient contraction force and the outer pressure sleeve 2 to generate sufficient expansion force, thereby achieving a locking effect far exceeding the direct force of the screw.

[0039] To withstand the enormous stress generated during locking, the main load-bearing components, such as the inner pressure expansion sleeve 1 and the outer pressure expansion sleeve 2, are made of high-strength alloy steel (e.g., 42CrMo) and undergo quenching and tempering heat treatment to ensure that they have sufficient strength, hardness and toughness.

[0040] The implementation principle of the gear expansion sleeve structure in this application embodiment is as follows: In this gear 8 expansion sleeve structure, the adjusting screw 3 is threadedly connected to the threaded holes at the ends of the inner pressure expansion sleeve 1 and the outer pressure expansion sleeve 2. By rotating the adjusting screw 3, it moves axially. The axial movement of the adjusting screw 3 will squeeze the first end plate 11 of the inner pressure expansion sleeve 1, causing the inner pressure expansion sleeve 1 to move axially as a whole. On the one hand, the inner surface of the inner sleeve 12 of the inner pressure expansion sleeve 1 axially abuts against the outer surface of the connecting shaft 7. On the other hand, the first mating surface 13 of the outer surface of the inner sleeve 12 fits and abuts against the second mating surface 23 of the inner surface of the outer sleeve 22 of the outer pressure expansion sleeve 2. As the inner pressure expansion sleeve 1 moves axially, the outer surface of the inner sleeve 12 squeezes the outer pressure expansion sleeve 2, and the outer surface of the outer sleeve 22 of the outer pressure expansion sleeve 2 squeezes the inner surface of the gear 8, thereby achieving the fastening of the gear 8 and the connecting shaft 7, improving the stability and reliability of the connection between the gear 8 and the connecting shaft 7, and better meeting the requirements of modern mechanical transmission. It is a significant improvement compared with the prior art.

[0041] Example 2 refer to Figures 3-5The difference between this embodiment and Embodiment 1 is that it also includes a stabilizing disc 6 sleeved on the outer surface of the connecting shaft 7. The symmetrically arranged inner pressure expansion sleeve 1 and outer pressure expansion sleeve 2 abut against the stabilizing disc 6 between the connecting shaft 7 and the gear 8. The stabilizing disc 6 is used to combine the forces on both symmetrical ends of the symmetrically arranged inner pressure expansion sleeve 1 and outer pressure expansion sleeve 2. When the inner pressure expansion sleeve 1 and outer pressure expansion sleeve 2 abut against the outer surface of the connecting shaft 7 and the inner surface of the gear 8 respectively and apply pressure, the stabilizing disc 6 can make the symmetrical ends of the symmetrically arranged inner pressure expansion sleeve 1 and outer pressure expansion sleeve 2 combine the forces, avoiding uneven force on both ends leading to structural instability, enhancing the overall stability and reliability of the gear 8 tightening sleeve structure, and making the connection between the gear 8 and the connecting shaft 7 more secure.

[0042] In this embodiment, more specifically, semi-concave arc surfaces 61 are provided at the edges of both the upper and lower end faces of the stabilizing disc 6. The outer surface of the semi-concave arc surface 61 abuts against the inner surface of the gear 8. An inclined arc surface 24 is provided on one side of the bottom end of the outer pressure sleeve 2 corresponding to the semi-concave arc surface 61. While the outer surface of the outer pressure sleeve 2 presses against the inner surface of the gear 8, the inclined arc surface 24 presses against the semi-concave arc surface 61. When the adjusting screw 3 presses the outer surface of the outer pressure sleeve 2 against the inner surface of the gear 8, the inclined arc surface 24 will also press against the semi-concave arc surface 61. In this way, a more secure connection is formed between the outer pressure sleeve 2 and the stabilizing disc 6. The tight fit between the semi-concave arc surface 61 and the inclined arc surface 24 increases the contact area, making the force transmission more uniform. On the one hand, it enhances the squeezing effect of the external pressure expansion sleeve 2 on the inner surface of the gear 8, further improving the tightness between the gear 8 and the connecting shaft 7. On the other hand, the stabilizing disc 6 can better disperse the pressure transmitted by the external pressure expansion sleeve 2, avoiding excessive local pressure that could lead to structural damage. This improves the stability and reliability of the entire gear 8 expansion sleeve structure, ensuring that the connection between the gear 8 and the connecting shaft 7 remains tight during long-term use.

[0043] The outer diameter of the stabilizing disc 6 is fitted with the inner hole of the gear 8 with a small clearance, ensuring that it acts as a radial positioning reference in the inner hole of the gear 8. Its thickness and material selection must ensure that when it is subjected to the maximum axial locking force applied by the adjusting screws 3 on both sides, its deformation is minimal and it has sufficient axial stiffness. During operation, it acts as a rigid central reaction base, ensuring that the axial forces applied to the expansion units on both sides are always equal in magnitude and strictly opposite in direction, thus forming a mechanical balance system and forcing the entire connection structure to automatically align with the center during the locking process.

[0044] During installation, the central stabilizing disc 6 and the expansion units on both sides are fitted into the inner hole of the gear 8 and the connecting shaft 7 is threaded through. Then, the adjusting screws 3 on both sides are tightened symmetrically and gradually. The axial thrust of the adjusting screws 3 is transmitted to the inner pressure expansion sleeve 1 and the outer pressure expansion sleeve 2. Due to the wedge-shaped effect between the first mating surface 13 on the outer surface of the inner sleeve 12 and the second mating surface 23 on the inner surface of the outer sleeve 22, the axial thrust is efficiently decomposed into radial force: on the one hand, it generates a force that causes the inner pressure expansion sleeve 1 to contract, thereby tightly holding the connecting shaft 7; on the other hand, it generates a force that causes the outer pressure expansion sleeve 2 to expand, thereby firmly tightening the inner hole of the gear 8. Throughout the process, the forces on both sides are always kept in balance through the stabilizing disc 6, ensuring the automatic alignment of the gear 8.

[0045] Example 3 refer to Figure 3 and Figure 7 The difference between this embodiment and Embodiment 1 is that it also includes a positioning element 5 to prevent slippage between the first end plate 11 and the second end plate 21. The positioning element 5 includes several positioning rods 51 disposed at the bottom of the first end plate 11 and several positioning holes 52 disposed through the top of the second end plate 21. The several positioning rods 51 are inserted into the positioning holes 52 one by one. When the inner pressure sleeve 1 and the outer pressure sleeve 2 move axially and are squeezed under the action of the adjusting screw 3, the cooperation between the positioning rods 51 and the positioning holes 52 can limit the relative position of the first end plate 11 and the second end plate 21, prevent slippage between the first end plate 11 and the second end plate 21, and ensure the relative position between the inner pressure sleeve 1 and the outer pressure sleeve 2 is stable. This ensures that the pressing and squeezing action between the outer surface of the inner sleeve 12 and the inner surface of the outer sleeve 22, the inner surface of the inner sleeve 12 and the outer surface of the connecting shaft 7, and the outer surface of the outer sleeve 22 and the inner surface of the gear 8 can be stably realized, making the fastening effect between the gear 8 and the connecting shaft 7 more reliable.

[0046] In this embodiment, more specifically, a rubber sleeve 53 is fixedly connected to the inner wall of each of the several positioning holes 52. The inner wall of the rubber sleeve 53 contacts the outer surface of the positioning rod 51. Utilizing the elastic properties of the rubber sleeve 53, when the positioning rod 51 is inserted into the positioning hole 52, the rubber sleeve 53 will undergo elastic deformation, tightly wrapping the positioning rod 51 and increasing the friction between the positioning rod 51 and the positioning hole 52. This friction can effectively prevent the positioning rod 51 from shaking or shifting in the positioning hole 52, thereby preventing slippage between the first end plate 11 and the second end plate 21, making the connection between the inner pressure expansion sleeve 1 and the outer pressure expansion sleeve 2 more stable, and ensuring the overall stability and reliability of the gear 8 tightening sleeve structure.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gear expansion sleeve structure for coaxially fastening a gear (8) to a connecting shaft (7), characterized in that, include: An inner pressure expansion sleeve (1) is axially adjustable and sleeved on the outer surface of the connecting shaft (7), with the inner surface of the inner pressure expansion sleeve (1) abutting against the outer surface of the connecting shaft (7). An external pressure expansion sleeve (2) is coaxially fitted into the inner hole of the gear (8), and its end abuts against the end face of the gear (8). The outer surface of the external pressure expansion sleeve (2) abuts against the inner surface of the internal pressure expansion sleeve (1); and Several adjusting screws (3) are provided, which pass through the ends of the inner pressure expansion sleeve (1) and the outer pressure expansion sleeve (2). By axially moving the adjusting screws (3), the inner pressure expansion sleeve (1) is squeezed to move axially along the connecting shaft (7) and abuts against the inner surface of the outer pressure expansion sleeve (2) and the outer surface of the connecting shaft (7) respectively. At the same time, the outer surface of the outer pressure expansion sleeve (2) is driven to squeeze the inner surface of the gear (8) for fastening between the gear (8) and the connecting shaft (7).

2. The gear expansion sleeve structure according to claim 1, characterized in that: The inner pressure expansion sleeve (1) includes a first end plate (11) as the end of the inner pressure expansion sleeve (1) and an inner sleeve (12) fixedly connected to the middle of the first end plate (11). The outer surface of the inner sleeve (12) is provided with a first mating surface (13). When it moves axially with the first end plate (11), the outer surface of the inner sleeve (12) squeezes the outer pressure expansion sleeve (2). The inner surface of the inner sleeve (12) is axially arranged and abuts against the outer surface of the connecting shaft (7).

3. The gear expansion sleeve structure according to claim 2, characterized in that: The external pressure expansion sleeve (2) includes a second end plate (21) as the end of the external pressure expansion sleeve (2) and an outer sleeve (22) fixedly connected to the middle of the second end plate (21). The first end plate (11) and the second end plate (21) are in close contact with each other. The inner surface of the outer sleeve (22) is provided with a second mating surface (23). The first mating surface (13) and the second mating surface (23) fit and abut against each other. The outer surface of the outer sleeve (22) abuts against the inner surface of the gear (8).

4. The gear expansion sleeve structure according to claim 2, characterized in that: The end face of the inner sleeve (12) is on the same horizontal plane as the end of the outer pressure sleeve (2), and a retention gap (4) is provided between the upper outer surface of the inner sleeve (12) and the inner surface of the end of the outer pressure sleeve (2) for separating the inner pressure sleeve (1) and the outer pressure sleeve (2).

5. The gear expansion sleeve structure according to claim 3, characterized in that: It also includes a positioning element (5) for preventing slippage between the first end plate (11) and the second end plate (21). The positioning element (5) includes a plurality of positioning rods (51) disposed at the bottom of the first end plate (11) and a plurality of positioning holes (52) disposed through the top of the second end plate (21). The plurality of positioning rods (51) are inserted into the positioning holes (52) one by one.

6. The gear expansion sleeve structure according to claim 5, characterized in that: A rubber sleeve (53) is fixedly connected to the inner wall of each of the positioning holes (52), and the inner wall of the rubber sleeve (53) is in contact with the outer surface of the positioning rod (51).

7. The gear expansion sleeve structure according to claim 1, characterized in that: It also includes a stabilizing disc (6) sleeved on the outer surface of the connecting shaft (7). The symmetrically arranged inner pressure expansion sleeve (1) and outer pressure expansion sleeve (2) abut against the stabilizing disc (6) between the connecting shaft (7) and the gear (8). The stabilizing disc (6) is used to combine the forces at both ends of the symmetrically arranged inner pressure expansion sleeve (1) and outer pressure expansion sleeve (2).

8. The gear expansion sleeve structure according to claim 7, characterized in that: The upper and lower end faces of the stabilizing plate (6) are provided with semi-concave arc surfaces (61). The outer surface of the semi-concave arc surface (61) abuts against the inner surface of the gear (8). The bottom side of the outer pressure sleeve (2) is provided with an inclined arc surface (24) corresponding to the semi-concave arc surface (61). The outer surface of the outer pressure sleeve (2) abuts against the inner surface of the gear (8) while the inclined arc surface (24) abuts against the semi-concave arc surface (61).

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