A universal joint

Abstract

The utility model discloses a universal joint relates to universal joint technical field, include: from left to right setting main shaft, spring wire, sleeve and square tenon in proper order, the one end of main shaft is provided with first ball head, and the one end of first ball head is provided with first core hole, and first core hole extends to the inside of main shaft, this universal joint makes the first ball head of main shaft and the second ball head of square tenon only can move in the sleeve clearance range in the working process, has reduced the abnormal wear and tear of ball head with sleeve because of excessive deviation or deflection, and can rely on the elastic deformation and cooperation gap of spring wire to realize angle deflection and distance deviation, can keep relative flat state, reduced the transmission fluctuation caused by ball head position instability, improved the stability and precision of transmission, simultaneously, when assembling sensor, ball head can keep relatively stable position, more conveniently aligns the mounting hole of sensor, improved assembly efficiency and assembly quality.

Description

Technical Field

[0001] This utility model belongs to the field of universal joint technology, specifically a universal joint. Background Technology

[0002] Universal joints, as mechanical devices capable of transmitting power at varying angles, play a crucial role in numerous fields such as automobiles, aerospace, and industrial machinery. Traditional universal joints typically consist of components such as ball joints and sleeves. The ball joints have a large degree of freedom, which allows the universal joint to achieve large deflection angles and offset distances, thus providing greater flexibility and adapting to complex and changing working environments and motion requirements.

[0003] Chinese patent CN206608476U discloses a double-ball-head universal joint structure, which increases the swing angle during shaft transmission by using a double-ball-head universal joint, making the shaft transmission rotation angle more flexible. Although increasing the swing angle can improve the rotation flexibility of the universal joint, it can also easily cause excessive deflection and offset of the ball head, resulting in wear and gaps between the ball head and the sleeve. This makes it impossible for the universal joint to return to a straight state and ensure that it remains straight throughout its lifespan. Consequently, the stability and accuracy of the universal joint transmission cannot be guaranteed. Furthermore, it is difficult to align the mounting holes when assembling sensors, resulting in low assembly efficiency.

[0004] Therefore, there is an urgent need for a universal joint that reduces abnormal wear between the ball joint and the sleeve caused by excessive offset or deflection, ensures that it can maintain a relatively flat state throughout its lifespan, and improves assembly efficiency and quality. Utility Model Content

[0005] The purpose of this utility model is to provide a segmented wind turbine tower transfer fixture to solve at least one aspect of the problems and defects mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A universal joint includes: From left to right, the main shaft, spring steel wire, sleeve, and square tenon are arranged in sequence. The spindle is provided with a first ball head at one end, and a first core hole at one end of the first ball head, the first core hole extending into the spindle; The square tenon is provided with a second ball head at one end, and a second core hole is provided at one end of the second ball head, with the second core hole extending into the square tenon; One end of the spring steel wire is set inside the main shaft, and the other end is set inside the square tenon; The first ball head and the second ball head are respectively disposed inside the sleeve, and the inner wall of the sleeve is adapted to the outer wall of the first ball head and the second ball head.

[0007] The universal joint according to this solution has at least the following technical effects: This universal joint allows the first ball joint of the spindle and the second ball joint of the square tenon to move only within the sleeve clearance range during operation. Compared with traditional universal joints, this greatly reduces abnormal wear between the ball joints and the sleeve caused by excessive offset or deflection, effectively extending the service life of each ball joint and sleeve. Furthermore, it can achieve angular deflection and distance offset by relying on the elastic deformation of the spring steel wire and the fit clearance, ensuring that it can maintain a relatively straight state throughout its lifespan. This reduces transmission fluctuations caused by unstable ball joint positions and improves transmission stability and accuracy. At the same time, when assembling sensors, the ball joints can maintain a relatively stable position, making it easier to align with the sensor mounting holes, thus improving assembly efficiency and quality.

[0008] As a further embodiment of this utility model: the first ball head includes a first arc surface divided into four equal parts and a first spherical curved surface that is interposed with the first arc surface.

[0009] As a further embodiment of this utility model: the second ball head includes a second arc surface divided into four equal parts and a second spherical curved surface that is interposed with the second arc surface.

[0010] As a further embodiment of this utility model: the inner wall of the sleeve is provided with a curved surface that is adapted to the first arc surface and the second arc surface.

[0011] Because the first ball joint includes a first arc surface divided into four equal parts and a first spherical surface intersecting the first arc surface; the second ball joint includes a second arc surface divided into four equal parts and a second spherical surface intersecting the second arc surface; and the inner wall of the sleeve is provided with a curved surface adapted to the first and second arc surfaces; this increases the contact area between the ball joint and the sleeve. When transmitting torque and bearing loads, the larger contact area can disperse stress and reduce the pressure per unit area, thereby improving the load-bearing capacity of the universal joint and enabling its application in high-load-bearing conditions. Furthermore, compared to the traditional universal joint ball joint structure, it can more precisely control the movement trajectory of each ball joint, reducing transmission errors caused by movement deviations, thus improving the overall transmission accuracy of the universal joint and ensuring the accuracy and stability of power transmission. At the same time, the contact between each ball joint and the sleeve is more uniform, avoiding excessive local wear and extending the service life of the universal joint.

[0012] As a further embodiment of this utility model: the sleeve is provided with retaining rings at both ends, one retaining ring engaging with the first spherical curved surface, and the other retaining ring engaging with the second spherical curved surface.

[0013] By setting retaining rings at both ends of the sleeve, with one retaining ring engaging with the first spherical surface and the other retaining ring engaging with the second spherical surface, the retaining rings at both ends of the sleeve securely restrain the first and second ball heads within the sleeve through the first spherical surface of the first ball head and the second spherical surface of the second ball head, respectively. This ensures that the ball heads will not come out due to vibration, impact, or other external forces during operation. When transmitting power, this makes the transmission of torque and speed more stable, reduces transmission fluctuations and errors caused by ball head instability, and improves the stability of the entire transmission system.

[0014] As a further embodiment of this utility model: a buffer pad is also provided inside the sleeve, one end of the first ball head abuts against one side of the buffer pad, and one end of the second ball head abuts against the other side of the buffer pad.

[0015] Because a buffer pad is also installed inside the sleeve, one end of the first ball joint abuts against one side of the buffer pad, and one end of the second ball joint abuts against the other side of the buffer pad. During the operation of the universal joint, due to the unevenness of power transmission and changes in external load, the ball joints will be subjected to various impacts and vibrations. The buffer pad has good elasticity and cushioning performance. When impacts and vibrations are transmitted to the ball joints, the buffer pad can absorb and disperse these energies, reducing the direct collision and friction between the ball joints and the sleeve, thereby reducing the impact of impacts and vibrations on the universal joint and reducing the loosening and damage of parts caused by vibration and impact. Furthermore, the buffer pad can effectively eliminate the axial clearance between the first and second ball joints, ensuring a tight fit between the ball joints in the axial direction and improving the accuracy and stability of the transmission system. At the same time, the elasticity of the buffer pad can provide a reverse force when the ball joints deviate. When the buffering force acts on the ends of each ball joint, the buffer pad can restore the flatness, allowing the ball joints to return to a relatively flat state, ensuring that the universal joint can maintain a good working condition throughout its life cycle.

[0016] As a further improvement of this utility model, the buffer pad is made of rubber.

[0017] Because the buffer pad is made of rubber, it can undergo significant elastic deformation when subjected to external forces. When the first and second ball joints generate axial forces during operation and act on the buffer pad, the rubber buffer pad can absorb and disperse these energies through its own elastic deformation, effectively buffering the impact and vibration between the ball joint and the sleeve, reducing component wear and damage caused by impact and vibration, and extending the service life of the universal joint. Furthermore, the rubber material has a certain degree of flexibility and plasticity, which can tightly fill the space between the first and second ball joints, effectively eliminating axial clearance.

[0018] As a further improvement of this utility model, the sleeve is made of bearing steel.

[0019] Because the sleeve is made of bearing steel, preferably GCr15 bearing steel, which, after heat treatment, achieves high hardness, typically reaching HRC61-65. During the operation of the universal joint, the sleeve needs to withstand frequent friction and compression from the ball joints. High hardness allows the sleeve surface to resist wear, maintaining its shape and dimensional accuracy. This not only extends the sleeve's service life but also ensures the long-term stable performance of the universal joint, reducing the probability of decreased transmission accuracy and malfunctions due to sleeve wear. Simultaneously, the sleeve also possesses a certain degree of toughness, effectively absorbing energy and ensuring the reliability and safety of the universal joint. Attached Figure Description

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of a three-dimensional exploded structure of a universal joint; Figure 2 This is a schematic diagram of the overall cross-sectional structure of a universal joint; Figure 3 This is a schematic diagram of a universal joint spindle structure; Figure 4 This is a schematic diagram of a universal joint tenon structure; Figure 5 This is a schematic diagram of a universal joint sleeve structure.

[0022] Figure label: 1. Spindle; 11. First ball head; 111. First arc surface; 112. First spherical surface; 12. First core hole; 2. Spring steel wire; 3. Sleeve; 31. Curved surface; 4. Square tenon; 41. Second ball head; 411. Second arc surface; 412. Second spherical surface; 42. Second core hole; 5. Snap ring; 6. Buffer pad. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] 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 the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] like Figure 1 and Figure 2The embodiment of the present invention shown includes a universal joint comprising, from left to right, a main shaft 1, a spring steel wire 2, a sleeve 3, and a square tenon 4; a first ball head 11 is provided at one end of the main shaft 1, and a first core hole 12 is provided at one end of the first ball head 11, extending into the main shaft 1; a second ball head 41 is provided at one end of the square tenon 4, and a second core hole 42 is provided at one end of the second ball head 41, extending into the square tenon 4; one end of the spring steel wire 2 is provided in the main shaft 1, and the other end is provided in the square tenon 4; the first ball head 11 and the second ball head 41 are respectively provided in the sleeve 3, and the inner wall of the sleeve 3 is adapted to the outer wall of the first ball head 11 and the second ball head 4.

[0030] Specifically, this universal joint allows the first ball joint 11 of the spindle 1 and the second ball joint 41 of the tenon 4 to move only within the clearance range of the sleeve 3 during operation. Compared with traditional universal joints, this greatly reduces abnormal wear between the ball joints and the sleeve 3 caused by excessive offset or deflection, effectively extending the service life of each ball joint and the sleeve 3. Furthermore, it can achieve angular deflection and distance offset by relying on the elastic deformation of the spring steel wire 2 and the fit clearance, ensuring that it can maintain a relatively straight state throughout its life cycle, reducing transmission fluctuations caused by unstable ball joint positions, and improving transmission stability and accuracy. At the same time, when assembling sensors, the ball joints can maintain a relatively stable position, making it easier to align with the sensor mounting holes, thus improving assembly efficiency and assembly quality.

[0031] like Figure 3-5 As shown, the first ball head 11 includes a first arc surface 111 divided into four equal parts and a first spherical surface 112 that is interposed with the first arc surface 111; the second ball head 41 includes a second arc surface 411 divided into four equal parts and a second spherical surface 412 that is interposed with the second arc surface 411; the inner wall of the sleeve 3 is provided with a curved surface 31 that is adapted to the first arc surface 111 and the second arc surface 411.

[0032] Specifically, the first ball joint 11 includes a first arc surface 111 divided into four equal parts and a first spherical surface 112 intersecting the first arc surface 111; the second ball joint 41 includes a second arc surface 411 divided into four equal parts and a second spherical surface 412 intersecting the second arc surface 411; the inner wall of the sleeve 3 is provided with a curved surface 31 that matches the first arc surface 111 and the second arc surface 411; this increases the contact area between the ball joint and the sleeve 3. When transmitting torque and bearing load, the larger contact area can disperse stress and reduce the pressure per unit area, thereby improving the load-bearing capacity of the universal joint and enabling it to be used in working conditions with high load-bearing requirements; and compared with the traditional universal joint ball joint structure, it can more accurately control the movement trajectory of each ball joint, reduce the transmission error caused by movement deviation, and thus improve the transmission accuracy of the entire universal joint, ensuring the accuracy and stability of power transmission; at the same time, the contact between each ball joint and the sleeve 3 is more uniform, avoiding local excessive wear and extending the service life of the universal joint.

[0033] like Figure 1 As shown, the sleeve 3 is provided with retaining rings 5 ​​at both ends. One retaining ring 5 engages with the first spherical surface 112, and the other retaining ring 5 engages with the second spherical surface 412.

[0034] Specifically, by setting retaining rings 5 ​​at both ends of the sleeve 3, one retaining ring 5 engages with the first spherical surface 112, and the other retaining ring 5 engages with the second spherical surface 412, the retaining rings 5 ​​at both ends of the sleeve 3 securely restrict the first ball head 11 and the second ball head 41 within the sleeve 3 through the first spherical surface 111 of the first ball head 11 and the second spherical surface 412 of the second ball head 41, respectively. This ensures that the ball heads will not come out due to vibration, impact or other external forces during operation. When transmitting power, this makes the transmission of torque and speed more stable, reduces transmission fluctuations and errors caused by ball head instability, and improves the stability of the entire transmission system.

[0035] According to embodiments of the present invention, such as Figure 1 and Figure 2 As shown, a buffer pad 6 is also provided inside the sleeve 3. One end of the first ball head 11 abuts against one side of the buffer pad 6, and one end of the second ball head 41 abuts against the other side of the buffer pad 6.

[0036] Specifically, since a buffer pad 6 is also provided inside the sleeve 3, one end of the first ball head 11 abuts against one side of the buffer pad 6, and one end of the second ball head 41 abuts against the other side of the buffer pad 6. During the operation of the universal joint, due to the unevenness of power transmission and changes in external load, the ball head will be subjected to various impacts and vibrations. The buffer pad has good elasticity and buffering performance. When impacts and vibrations are transmitted to the ball head, the buffer pad can absorb and disperse these energies, reducing the direct collision and friction between the ball head and the sleeve 3, thereby reducing the impact of impacts and vibrations on the universal joint and reducing the loosening and damage of parts caused by vibrations and impacts. Furthermore, the buffer pad 6 can effectively eliminate the axial clearance between the first ball head 11 and the second ball head 41, ensuring that the ball head fits tightly in the axial direction, improving the accuracy and stability of the transmission system. At the same time, the elasticity of the buffer pad 6 can provide a reverse force when the ball head deviates. When the buffering force acts on the ends of each ball head, the buffer pad 6 can restore the flatness, allowing the ball head to return to a relatively flat state, ensuring that the universal joint can always maintain a good working condition throughout its life cycle.

[0037] Furthermore, the cushioning pad 6 is made of rubber.

[0038] Specifically, since the buffer pad 6 is made of rubber, it can undergo significant elastic deformation when subjected to external forces. When the first ball head 11 and the second ball head 41 generate axial forces during operation and act on the buffer pad 6, the rubber buffer pad can absorb and disperse these energies through its own elastic deformation, effectively buffering the impact and vibration between the ball head and the sleeve 3, reducing component wear and damage caused by impact and vibration, and extending the service life of the universal joint. Furthermore, the rubber material has a certain degree of flexibility and plasticity, which can tightly fill the space between the first ball head 11 and the second ball head 41, effectively eliminating axial clearance.

[0039] It should also be noted that sleeve 3 is made of bearing steel.

[0040] Specifically, sleeve 3 is made of bearing steel, preferably GCr15 bearing steel. GCr15 bearing steel, after heat treatment, achieves high hardness, typically reaching HRC61-65. During the operation of the universal joint, sleeve 3 needs to withstand frequent friction and compression from the ball joints. High hardness allows the surface of sleeve 3 to resist wear, maintaining its shape and dimensional accuracy. This not only extends the service life of sleeve 3 but also ensures the long-term stable performance of the universal joint, reducing the probability of decreased transmission accuracy and malfunctions caused by sleeve 3 wear. Simultaneously, sleeve 3 also possesses a certain degree of toughness, effectively absorbing energy and ensuring the reliability and safety of the universal joint.

[0041] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A universal joint, characterized in that, include: From left to right, the main shaft, spring steel wire, sleeve, and square tenon are arranged in sequence. The spindle is provided with a first ball head at one end, and a first core hole at one end of the first ball head, the first core hole extending into the spindle; The square tenon is provided with a second ball head at one end, and a second core hole is provided at one end of the second ball head, with the second core hole extending into the square tenon; One end of the spring steel wire is set inside the main shaft, and the other end is set inside the square tenon; The first ball head and the second ball head are respectively disposed inside the sleeve, and the inner wall of the sleeve is adapted to the outer wall of the first ball head and the second ball head.

2. The universal joint according to claim 1, characterized in that, The first ball head includes a first arc surface divided into four equal parts and a first spherical surface that is staggered with the first arc surface.

3. The universal joint according to claim 2, characterized in that, The second ball head includes a second arc surface divided into four equal parts and a second spherical surface that is interposed with the second arc surface.

4. The universal joint according to claim 3, characterized in that, The inner wall of the sleeve is provided with a curved surface that matches the first and second arc surfaces.

5. The universal joint according to claim 4, characterized in that, The sleeve is provided with retaining rings at both ends, one retaining ring engages with the first spherical curved surface, and the other retaining ring engages with the second spherical curved surface.

6. The universal joint according to claim 5, characterized in that, The sleeve is also provided with a buffer pad, one end of the first ball head abuts against one side of the buffer pad, and one end of the second ball head abuts against the other side of the buffer pad.

7. The universal joint according to claim 6, characterized in that, The cushioning pad is made of rubber.

8. The universal joint according to any one of claims 1 to 7, characterized in that, The sleeve is made of bearing steel.

Images