Flexible transmission structure

Abstract

The utility model relates to mechanical drive technical field especially relates to a kind of flexible transmission structure, the shaft hole of first transmission shaft is uniformly arranged with several first grooves in circle;The outer surface of intermediate transmission shaft is uniformly arranged with tooth part in circle, tooth part extends installation to first groove, the shaft hole of intermediate transmission shaft is formed into conical hole, and first key groove is provided on conical hole;Flexible block can be extruded deformation, flexible block is set in at least one side of each tooth part and adheres to the side wall of first groove and tooth part;One end of second transmission shaft is formed into conical part, second key groove is provided on conical part, conical part is inserted into conical hole installation, and conical part inserts flat key and connects first key groove and second key groove.Transmission torque, flexible block produces deformation after being stressed, can buffer the impact generated by rigid connection, also can contain the problem that the first transmission shaft and second transmission shaft are not concentric caused by machining and assembly error, avoid noise, abrasion and broken shaft failure.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical transmission technology, and in particular relates to a flexible transmission structure. Background Technology

[0002] Currently, torque transmission between motors and gearboxes on the market is usually achieved through a rigid connection between the motor shaft and the gearbox shaft, such as a tapered mating connection or a splined mating connection. This structure requires high machining precision, is complex, difficult to assemble, and is relatively expensive. Furthermore, the rigid connection can generate impact during torque transmission, and insufficient machining or assembly can lead to misalignment between the motor shaft and the gearbox shaft, resulting in problems such as noise, wear, and even shaft breakage.

[0003] Therefore, this utility model addresses the aforementioned technical problems by providing a flexible transmission structure. By configuring a flexible block between the motor shaft and the gearbox shaft for transmission connection, it can effectively solve one or more of the aforementioned problems. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, this utility model provides a flexible transmission structure, comprising:

[0005] The first drive shaft is a hollow shaft, and a number of first grooves are evenly arranged in a circular pattern on the shaft hole of the first drive shaft.

[0006] An intermediate drive shaft is a tubular structure. The outer surface of the intermediate drive shaft is evenly arranged with a number of teeth. The teeth extend into the first groove. The shaft hole of the intermediate drive shaft is formed as a tapered hole, and a first keyway is provided on the tapered hole.

[0007] A flexible block, which can be extruded and deformed, is disposed on at least one side of each of the teeth and conforms to the first groove and the sidewall of the tooth;

[0008] The second drive shaft is a solid shaft, and one end of the second drive shaft is formed into a tapered portion. A second keyway is provided on the tapered portion. The tapered portion is inserted into the tapered hole for installation. The first keyway is aligned with the second keyway. The tapered portion is inserted into a flat key to connect the first keyway and the second keyway.

[0009] Optionally, in some technical solutions, the first drive shaft is connected to a motor, and the power output from the first drive shaft is transmitted to the intermediate drive shaft via the flexible block. The intermediate drive shaft then drives the second drive shaft via the flat key.

[0010] Optionally, in some technical solutions, the second drive shaft is connected to a motor, and the power output from the second drive shaft drives the intermediate drive shaft via the flat key. The intermediate drive shaft drives the first drive shaft via the flexible block.

[0011] Optionally, in some technical solutions, a front end cover and a rear end cover are also included. The front end cover is installed at the front end of the intermediate drive shaft by a first fastening bolt and abuts against the flexible block. The rear end cover is installed at the rear end of the intermediate drive shaft by a second fastening bolt and abuts against the flexible block.

[0012] Optionally, in some technical solutions, the front end face of the tapered part is provided with a plurality of tension threaded holes, and the front end cover is provided with a plurality of through holes corresponding to the tension threaded holes, and the third fastening bolt passes through the through holes and is fastened to the tension threaded holes.

[0013] Optionally, in some technical solutions, a step is formed at the rear end of the tapered portion, and the step abuts against the rear end cover.

[0014] Optionally, in some technical solutions, the flexible block is disposed on both sides of each of the tooth portions, and the flexible block is in close contact with the first groove and the sidewall of the tooth portion, or the flexible block is in a gap fit with the first groove and the sidewall of the tooth portion.

[0015] Optionally, in some technical solutions, the outer diameter of the tooth portion is smaller than the inner diameter of the first groove, the depth of the tooth portion into the first groove is not less than two-thirds of the height of the tooth portion, the contact height between the flexible block and the tooth portion is not less than three-quarters of the height of the tooth portion, and the contact depth between the flexible block and the first groove is not less than three-quarters of the depth of the first groove.

[0016] Optionally, in some technical solutions, the flexible block is made of polyurethane, nylon, or rubber material, and the flexible block is elongated with a cross-section that is rectangular, involute-toothed, trapezoidal, elliptical, circular, or fan-shaped.

[0017] Optionally, in some technical solutions, the first groove is a rectangular groove, an involute tooth groove, a spline groove, a circular groove, or a U-shaped groove.

[0018] The technical solution of this utility model has the following advantages or beneficial effects:

[0019] The flexible transmission structure provided by this utility model includes a first transmission shaft, an intermediate transmission shaft, a flexible block, and a second transmission shaft. The first transmission shaft is a hollow shaft, and a plurality of first grooves are evenly arranged circumferentially on the shaft hole of the first transmission shaft. The intermediate transmission shaft has a tubular structure, and a plurality of teeth are evenly arranged circumferentially on the outer surface of the intermediate transmission shaft. The teeth extend into the first grooves and are installed thereon. The shaft hole of the intermediate transmission shaft is formed into a conical hole, and a first keyway is provided on the conical hole. The flexible block can be deformed by compression. The flexible block is provided on at least one side of each tooth and fits against the sidewall of the first groove and the tooth. The second transmission shaft is a solid shaft, and one end of the second transmission shaft is formed into a conical part. A second keyway is provided on the conical part. The conical part is inserted into the conical hole for installation. The first keyway is aligned with the second keyway. The conical part is inserted into a flat key to connect the first keyway and the second keyway. The flexible transmission structure uses flexible blocks to connect the first, intermediate, and second transmission shafts. When transmitting torque, the flexible blocks deform under force, which can buffer the impact of rigid connection and also accommodate the misalignment of the first and second transmission shafts caused by processing and assembly errors, thus avoiding noise, wear, and shaft breakage failure. Attached Figure Description

[0020] Embodiments of the present invention will be described more fully with reference to the accompanying drawings. However, the accompanying drawings are for illustration and explanation only and do not constitute a limitation on the scope of the present invention.

[0021] Figure 1 This is a front view of the flexible transmission structure of this utility model;

[0022] Figure 2 for Figure 1 AA sectional view;

[0023] Figure 3 for Figure 1 CC cross-sectional view.

[0024] Illustration:

[0025] 1. First drive shaft; 2. Intermediate drive shaft; 3. Flexible block; 4. Second drive shaft; 5. First groove; 6. Toothed part; 7. Tapered hole; 8. First keyway; 9. Tapered part; 10. Second keyway; 11. Flat key; 12. Front end cover; 13. Rear end cover; 14. First fastening bolt; 15. Second fastening bolt; 16. Tension threaded hole; 17. Through hole; 18. Third fastening bolt; 19. Step. Detailed Implementation

[0026] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0027] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] In this description of the present invention, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In the description of this utility model, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0030] like Figure 1-3As shown, an embodiment of this utility model provides a flexible transmission structure, including a first transmission shaft 1, an intermediate transmission shaft 2, a flexible block 3, and a second transmission shaft 4. The first transmission shaft 1 is a hollow shaft, and a plurality of first grooves 5 are evenly arranged circumferentially on the shaft hole of the first transmission shaft 1. The intermediate transmission shaft 2 has a tubular structure, and a plurality of teeth 6 are evenly arranged circumferentially on the outer surface of the intermediate transmission shaft 2. The teeth 6 extend into the first grooves 5 and are installed thereon. The shaft hole of the intermediate transmission shaft 2 is formed into a conical hole 7, and a first keyway 8 is provided on the conical hole 7. The flexible block 3 can be deformed by compression. The flexible block 3 is provided on at least one side of each tooth 6 and fits against the first groove 5 and the sidewall of the tooth 6. The second transmission shaft 4 is a solid shaft, and one end of the second transmission shaft 4 is formed into a conical part 9. A second keyway 10 is provided on the conical part 9. The conical part 9 is inserted into the conical hole 7 for installation. The first keyway 8 is aligned with the second keyway 10. The conical part 9 is inserted into a flat key 11 to connect the first keyway 8 and the second keyway 10. The flexible transmission structure uses a flexible block 3 between the first transmission shaft 1, the intermediate transmission shaft 2, and the second transmission shaft 4 for transmission connection. When transmitting torque, the flexible block 3 deforms after being subjected to force, which can buffer the impact generated by the rigid connection and also accommodate the problem of misalignment of the first transmission shaft 1 and the second transmission shaft 4 caused by processing and assembly errors, thus avoiding noise, wear and shaft breakage failure.

[0031] Specifically, in this embodiment, the first drive shaft 1 is a motor shaft, which is connected to or mounted on the motor and is used to output the motor's torque power. The first drive shaft 1 has a hollow shaft structure and can accommodate the installation of the intermediate drive shaft 2. The intermediate drive shaft 2 and the first drive shaft 1 are connected by a gear-like or spline-like connection. That is, multiple circumferentially evenly distributed first grooves 5 are formed on the shaft hole of the first drive shaft 1. The intermediate drive shaft 2 has a tubular structure, and multiple teeth 6 are also circumferentially evenly distributed on the outer surface of the intermediate drive shaft 2 corresponding to the first grooves 5. When the intermediate drive shaft 2 is installed, each tooth 6 extends into the corresponding first groove 5. More specifically, in this embodiment, the shaft hole of the intermediate drive shaft 2 is formed as a tapered hole 7, and a first keyway 8 is also provided on the tapered hole 7. The tapered hole 7 is used to adapt the installation of the second drive shaft 4. The second drive shaft 4 is a solid shaft and can be a gearbox shaft. The front end of the second drive shaft 4 is formed as a tapered portion 9. The outer dimensions of the tapered portion 9 are adapted to the inner diameter of the tapered hole 7. The tapered portion 9 is inserted into the tapered hole 7 for tight installation. A second keyway 10 is also provided on the tapered portion 9. The second keyway 10 is aligned with the first keyway 8 and embedded in a flat key 11 for installation, so that torque power transmission is realized between the second drive shaft 4 and the intermediate drive shaft 2. Furthermore, in order to realize a flexible connection between the intermediate drive shaft 2 and the first drive shaft 1, a flexible block 3 is provided on at least one side of each tooth portion 6. The two sides of the flexible block 3 abut against the first groove 5 and the sidewall of the tooth portion 6, respectively. The flexible block 3 can be deformed by compression. When the first drive shaft 1 transmits torque, the torque can be transmitted to the intermediate drive shaft 2 via the flexible block 3, and then to the second drive shaft 4 via the flat key 11. The torque is then output from the second drive shaft 4, completing the power transmission. During torque transmission, the sidewall of the first groove 5 compresses the flexible block 3, which in turn compresses the sidewall of the toothed portion 6. The deformed flexible block 3 provides sufficient buffer for the first drive shaft 1 and the intermediate drive shaft 2, thus enabling the flexible transmission structure to not only buffer the impact generated by the rigid connection, but also to accommodate the misalignment of the first drive shaft 1 and the second drive shaft 4 caused by machining and assembly errors, reducing transmission impact and avoiding noise, wear, and shaft breakage.

[0032] Furthermore, in this embodiment, the first drive shaft 1 is connected to the motor, and the power output from the first drive shaft 1 is transmitted to the intermediate drive shaft 2 via the flexible block 3. The intermediate drive shaft 2 then transmits the power to the second drive shaft 4 via the key 11. Specifically, when the first drive shaft 1 is used as the power input end, it can be connected to the output end of the motor. In this way, the torque power output by the motor can reach the first drive shaft 1. The first drive shaft 1 rotates and compresses the flexible block 3, and then outputs torque power to the intermediate drive shaft 2 through the flexible block 3. The intermediate drive shaft 2 then transmits torque power to the second drive shaft 4 via the key 11. Finally, the second drive shaft 4 can output torque power to the gearbox or other transmission mechanism.

[0033] Furthermore, in some embodiments, the second drive shaft 4 is connected to a motor, and the power output from the second drive shaft 4 is transmitted to the intermediate drive shaft 2 via the key 11. The intermediate drive shaft 2 then transmits power to the first drive shaft 1 via the flexible block 3. Specifically, when the second drive shaft 4 serves as a power input, it can be connected to the output of the motor. In this way, the torque output from the motor can reach the second drive shaft 4. The second drive shaft 4 rotates and transmits power to the intermediate drive shaft 2 via the key 11. The intermediate drive shaft 2 rotates and presses against the flexible block 3, transmitting torque power to the first drive shaft 1 via the flexible block 3. Finally, the first drive shaft 1 can output torque power to the gearbox or other transmission mechanisms.

[0034] Furthermore, in this embodiment, a front cover 12 and a rear cover 13 are also included. The front cover 12 is installed at the front end of the intermediate drive shaft 2 by a first fastening bolt 14 and abuts against the flexible block 3. The rear cover 13 is installed at the rear end of the intermediate drive shaft 2 by a second fastening bolt 15 and abuts against the flexible block 3. Specifically, in order to stabilize the flexible block 3 between the first groove 5 and the toothed portion 6 and prevent the flexible block 3 from exiting from both ends of the first drive shaft 1 or the intermediate drive shaft 2, a front cover 12 and a rear cover 13 are respectively installed at both ends of the intermediate drive shaft 2 to abut against the flexible block 3. More specifically, the front cover 12 is installed at the front end of the intermediate drive shaft 2 by a first fastening bolt 14 and abuts against the flexible block 3, and the rear cover 13 is installed at the rear end of the intermediate drive shaft 2 by a second fastening bolt 15 and abuts against the flexible block 3. When assembling the flexible transmission structure, firstly, the rear end cover 13 is fitted onto the tapered portion 9 of the second transmission shaft 4, and then the intermediate transmission shaft 2 is threadedly connected by the second fastening bolt 15 to fasten the rear end cover 13; next, the tapered portion 9 of the second transmission shaft 4 is inserted into the tapered hole 7 of the intermediate transmission shaft 2 and installed so that the first keyway 8 is aligned with the second keyway 10, and then the flexible block 3 is assembled between the first groove 5 and the toothed portion 6, and a flat key 11 is driven between the first keyway 8 and the second keyway 10; finally, the intermediate transmission shaft 2 is threadedly connected to the front end of the intermediate transmission shaft 2 by the first fastening bolt 14 to press the front end cover 12, and the edges of the front end cover 12 and the rear end cover 13 extend outward and can resist the flexible block 3 to limit the forward and backward movement of the flexible block 3.

[0035] Furthermore, in this embodiment, the front end face of the tapered portion 9 is provided with a plurality of tension threaded holes 16, and the front end cover 12 is provided with a plurality of through holes 17 corresponding to the tension threaded holes. The third fastening bolt 18 passes through the through holes 17 and is fastened to the tension threaded holes 16. Specifically, in order to tension the second drive shaft 4, a plurality of tension threaded holes 16 are provided on the front end face of the tapered portion 9 of the second drive shaft 4, and a plurality of through holes 17 are provided on the front end cover 12 corresponding to the tension threaded holes 16. The third fastening bolt 18 passes through the through holes 17 and is fastened to the tension threaded holes 16, so as to stabilize the installation of the second drive shaft 4 and the intermediate drive shaft 2, prevent the second drive shaft 4 from loosening from the intermediate drive shaft 2 during transmission, and improve the transmission stability of the flexible transmission structure.

[0036] Furthermore, in this embodiment, a step 19 is formed at the rear end of the tapered portion 9, and the step 19 abuts against the rear end cover 13. Specifically, in order to restrict the rear end cover 13 on the second drive shaft 4, a step 19 is formed at the rear end of the tapered portion 9 on the second drive shaft 4. The outer diameter of the step 19 is larger than the inner diameter of the rear end cover 13. When the second drive shaft 4 is installed on the intermediate drive shaft 2 and positioned with a bearing, the step 19 can be lowered to the end face of the rear end cover 13 to prevent the rear end cover 13 from moving backward.

[0037] Furthermore, in this embodiment, flexible blocks 3 are disposed on both sides of each tooth portion 6 and abut against the first groove 5 and the sidewalls of the tooth portion 6. Specifically, to meet the application scenario of the flexible transmission structure, i.e., to achieve flexible transmission in both forward and reverse rotation of the motor, flexible blocks 3 are installed on both sides of each tooth portion 6. The two sides of the flexible blocks 3 are tightly abutted against the first groove 5 and the sidewalls of the tooth portion 6, thus enabling flexible transmission in both forward and reverse rotation of the motor. In particular, in the event of a sudden start of the motor or a sudden change in load causing an impact, the flexible blocks 3 on both sides of the tooth portion 6 can achieve a buffering effect. It should be noted that in this embodiment, the flexible blocks 3 can also be installed with a clearance fit to abut against the sidewalls of the first groove 5 and the tooth portion 6, so that the two sidewalls of the flexible blocks 3 maintain a certain gap with the sidewalls of the first groove 5 and the tooth portion 6, ensuring the buffering effect and making the assembly of the flexible blocks 3 relatively easy.

[0038] Furthermore, in this embodiment, the outer diameter of the toothed portion 6 is smaller than the inner diameter of the first groove 5, the depth of the toothed portion 6 extending into the first groove 5 is not less than two-thirds of the height of the toothed portion 6, the contact height between the flexible block 3 and the toothed portion 6 is not less than three-quarters of the height of the toothed portion 6, and the contact depth between the flexible block 3 and the first groove 5 is not less than three-quarters of the depth of the first groove 5. Specifically, to facilitate the assembly of the intermediate drive shaft 2 and the first drive shaft 1, the outer diameter of the toothed portion 6 should be less than or equal to the inner diameter of the first groove 5, that is, the first groove 5 and the toothed portion 6 are connected by a clearance fit or a transition fit. To ensure the transmission efficiency of the flexible transmission structure and to avoid excessive shearing of the flexible block 3 by the first drive shaft 1 and the intermediate drive shaft 2, the depth of the toothed portion 6 extending into the first groove 5 is not less than two-thirds of the height of the toothed portion 6, the contact height between the flexible block 3 and the toothed portion 6 is not less than three-quarters of the height of the toothed portion 6, and the contact depth between the flexible block 3 and the first groove 5 is not less than three-quarters of the depth of the first groove 5.

[0039] Furthermore, in this embodiment, the shape of the first groove 5 can be designed to adapt to the shape of the flexible block 3 according to actual needs. The flexible block 3 is made of polyurethane, nylon, or rubber material, and is elongated. The cross-sectional shape of the flexible block 3 includes, but is not limited to, rectangle, involute tooth, trapezoid, ellipse, circle, and fan shape. The groove shape of the first groove 5 includes, but is not limited to, rectangular groove, involute tooth groove, spline groove, circular groove, and U-shaped groove.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A flexible transmission structure, characterized in that, include: The first drive shaft is a hollow shaft, and a number of first grooves are evenly arranged in a circular pattern on the shaft hole of the first drive shaft. An intermediate drive shaft is a tubular structure. The outer surface of the intermediate drive shaft is evenly arranged with a number of teeth. The teeth extend into the first groove. The shaft hole of the intermediate drive shaft is formed as a tapered hole, and a first keyway is provided on the tapered hole. A flexible block, which can be extruded and deformed, is disposed on at least one side of each of the teeth and conforms to the first groove and the sidewall of the tooth; The second drive shaft is a solid shaft, and one end of the second drive shaft is formed into a tapered portion. A second keyway is provided on the tapered portion. The tapered portion is inserted into the tapered hole for installation. The first keyway is aligned with the second keyway. The tapered portion is inserted into a flat key to connect the first keyway and the second keyway.

2. The flexible transmission structure as described in claim 1, characterized in that, The first drive shaft is connected to a motor, and the power output from the first drive shaft is transmitted to the intermediate drive shaft via the flexible block. The intermediate drive shaft drives the second drive shaft via the flat key.

3. The flexible transmission structure as described in claim 1, characterized in that, The second drive shaft is connected to the motor, and the power output from the second drive shaft drives the intermediate drive shaft via the flat key. The intermediate drive shaft drives the first drive shaft via the flexible block.

4. The flexible transmission structure as described in any one of claims 2 or 3, characterized in that, It also includes a front cover and a rear cover. The front cover is installed at the front end of the intermediate drive shaft by a first fastening bolt and abuts against the flexible block. The rear cover is installed at the rear end of the intermediate drive shaft by a second fastening bolt and abuts against the flexible block.

5. The flexible transmission structure as described in claim 4, characterized in that, The front end face of the tapered part is provided with a plurality of tension threaded holes, and the front end cover is provided with a plurality of through holes corresponding to the tension threaded holes. The third fastening bolt passes through the through holes and is fastened to the tension threaded holes.

6. The flexible transmission structure as described in claim 5, characterized in that, The rear end of the tapered portion has a step, which abuts against the rear end cover.

7. The flexible transmission structure as described in claim 1, characterized in that, The flexible block is disposed on both sides of each tooth portion, and the flexible block is in close contact with the first groove and the side wall of the tooth portion or the flexible block is in gap fit with the first groove and the side wall of the tooth portion.

8. The flexible transmission structure as described in claim 1, characterized in that, The outer diameter of the tooth portion is smaller than the inner diameter of the first groove, the depth of the tooth portion into the first groove is not less than two-thirds of the height of the tooth portion, the contact height between the flexible block and the tooth portion is not less than three-quarters of the height of the tooth portion, and the contact depth between the flexible block and the first groove is not less than three-quarters of the depth of the first groove.

9. The flexible transmission structure as described in claim 1, characterized in that, The flexible block is made of polyurethane, nylon, or rubber material, and is elongated with a cross-section that is rectangular, involute-toothed, trapezoidal, elliptical, circular, or fan-shaped.

10. The flexible transmission structure as described in claim 1, characterized in that, The first groove is a rectangular groove, an involute tooth groove, a spline groove, a circular groove, or a U-shaped groove.

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