Coupling structure and transmission device

Abstract

The application discloses a coupling structure and a transmission device. The coupling structure comprises a connecting sleeve, a movable block and an elastic piece. One end of the connecting sleeve is provided with a first connecting hole, and the other end of the connecting sleeve is provided with a containing cavity penetrating through the end surface of the connecting sleeve. The movable block is located in the containing cavity, and the movable block is circumferentially limitedly connected with the connecting sleeve and axially slidably connected with the connecting sleeve. The movable block is provided with a second connecting hole. One end of the elastic piece is abutted with the connecting sleeve, and the other end of the elastic piece is abutted with the movable block. The elastic piece is always in a compressed state. On the basis of realizing the transmission connection between a power output shaft and a product to be adjusted, the coupling structure is not easy to cause damage to the product to be adjusted.

Description

Technical Field

[0001] This application relates to the field of mechanical transmission technology, and in particular to a coupling structure and transmission device. Background Technology

[0002] In applications that transmit torque, couplings are often used for transmission connections.

[0003] Taking the pressure regulating valve of a gas proportional valve as an example, the pressure regulating valve includes a valve body, an adjusting rod, a pressure regulating spring, and an adjusting diaphragm. The adjusting rod is threadedly connected to the valve body, and the two ends of the pressure regulating spring abut against the adjusting rod and the adjusting diaphragm, respectively. By adjusting the position of the adjusting rod, the preload of the pressure regulating spring can be adjusted, thereby achieving pressure regulation of the gas proportional valve.

[0004] When adjusting the pressure of the gas proportional valve, the servo motor is connected to the hexagonal screwdriver bit through a disc coupling. The cylinder pushes the servo motor, disc coupling, and hexagonal screwdriver bit together until the head of the hexagonal screwdriver bit is inserted into the hexagonal hole of the adjusting rod. After the head of the hexagonal screwdriver bit is inserted into the appropriate position, the servo motor drives the hexagonal screwdriver bit to rotate, thereby adjusting the relative position of the adjusting rod and the valve body, and thus achieving pressure adjustment.

[0005] In the above scheme, the engagement between the hexagonal screwdriver bit and the adjusting rod is achieved through a cylinder drive. The cylinder stroke is fixed. If the hexagonal screwdriver bit is inserted too deeply into the adjusting rod, it will cause excessive force on the rod, potentially damaging the threads between the adjusting rod and the valve body, thus affecting the performance of the regulating valve. Furthermore, when the hexagonal screwdriver bit is pulled out after adjustment, it may cause the adjusting rod to move, affecting the accuracy of pressure regulation. If the hexagonal screwdriver bit is inserted too shallowly, the contact area between the hexagonal screwdriver bit and the adjusting rod's internal hexagonal hole will be too small, causing the adjusting rod to strip, affecting regulation efficiency. Additionally, during pressure regulation, the hexagonal screwdriver bit and the adjusting rod's internal hexagonal hole may not be accurately aligned, affecting regulation efficiency.

[0006] Similar problems exist in other applications that transmit torque as described above.

[0007] How to at least partially alleviate or resolve the above-mentioned defects is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0008] The purpose of this application is to provide a coupling structure and transmission device that, while achieving a transmission connection between the power output shaft and the product being adjusted, is less likely to cause damage to the product being adjusted.

[0009] To solve the above-mentioned technical problems, this application provides a coupling structure, including a connecting sleeve, a movable block, and an elastic element;

[0010] One end of the connecting sleeve has a first connecting hole, and the other end of the connecting sleeve has a receiving cavity that penetrates the end face of the connecting sleeve;

[0011] The movable block is located within the accommodating cavity. The movable block and the connecting sleeve are connected in the circumferential direction at an upper limit. The movable block and the connecting sleeve are slidably connected in the axial direction. The movable block has a second connecting hole.

[0012] One end of the elastic element abuts against the connecting sleeve, and the other end of the elastic element abuts against the movable block. The elastic element is always in a compressed state.

[0013] Using the above-mentioned coupling structure, the movable block and the connecting sleeve are circumferentially limited, and the movable block can rotate together with the connecting sleeve. In application, the first connecting hole of the connecting sleeve can be connected to the power output shaft, and the second connecting hole of the movable block can be connected to the transmission shaft, realizing torque transmission between the power output shaft and the transmission shaft. The combination of the elastic element in a compressed state set between the movable block and the connecting sleeve and the axial sliding property of the movable block gives the transmission shaft elastic movement space, making it less likely to damage the product being adjusted when the transmission shaft is used with the product being adjusted.

[0014] In one feasible embodiment, the peripheral wall of the connecting sleeve has an axially extending slide hole, the movable block is equipped with a slider, at least a portion of the slider protruding radially outward from the outer peripheral wall of the movable block, and at least a portion of the slider extending into the slide hole and being able to slide along the slide hole.

[0015] In one possible implementation, at least a portion of the slider protrudes radially inward from the inner peripheral wall of the movable block.

[0016] In one feasible solution, the sliding element is a set screw, which is threadedly connected to the movable block.

[0017] In one feasible embodiment, the outer peripheral wall of the movable block includes at least one planar portion, and the cross-sectional shape of the accommodating cavity is consistent with the cross-sectional shape of the movable block.

[0018] In one feasible solution, the first connecting hole communicates with the receiving cavity, and the connection between the first connecting hole and the receiving cavity forms a stepped surface facing the movable block. One end of the elastic member abuts against the stepped surface, and the other end of the elastic member abuts against the end face of the movable block facing the first connecting hole.

[0019] In one feasible solution, the connecting sleeve includes a sleeve body and a splicing block, a portion of the first connecting hole is formed in the sleeve body, a portion of the first connecting hole is formed in the splicing block, and the splicing block is spliced ​​and fixed to the sleeve body in the circumferential direction.

[0020] In one feasible solution, a keyway is provided on the wall of the first connecting hole.

[0021] This application also provides a transmission device, including a drive component, a transmission shaft, and a coupling structure. The coupling structure is any of the coupling structures described above. The output shaft of the drive component is tightly fitted with the first connecting hole, and the transmission shaft is inserted into the second connecting hole and circumferentially limited and connected to the movable block.

[0022] Since the aforementioned coupling structure has the aforementioned technical effects, the transmission device including the coupling structure also has the corresponding technical effects, which will not be discussed again here.

[0023] In one possible implementation, the drive shaft is clearance-fitted with the second connecting hole, and / or the movable block is clearance-fitted with the accommodating cavity.

[0024] In one possible embodiment, the portion of the drive shaft inserted into the second connecting hole has a recess, and the movable block is fitted with a set screw that abuts against the recess radially. Attached Figure Description

[0025] Figure 1 This is an exploded view of the coupling structure in the embodiments provided in this application;

[0026] Figure 2 This is a cross-sectional view of the coupling structure in a first state in the embodiments provided in this application;

[0027] Figure 3 This is a cross-sectional view of the coupling structure in a second state in the embodiments provided in this application;

[0028] Figure 4 for Figure 1 Structural diagram of the connecting sleeve;

[0029] Figure 5 for Figure 4 Structural diagram of the inner casing;

[0030] Figure 6 for Figure 5 The cross-sectional view of the main body shown;

[0031] Figure 7 for Figure 4 Structural diagram of the middle splicing block;

[0032] Figure 8 for Figure 4 Perspective view of the central panel;

[0033] Figure 9 for Figure 1 Structure diagram of the active block;

[0034] Figure 10 for Figure 1 Perspective view of the active block;

[0035] Figure 11 This is a perspective view of the splicing block in another embodiment.

[0036] Explanation of reference numerals in the attached figures:

[0037] The coupling structure 10 includes a connecting sleeve 11, a sleeve body 111, a first mounting hole 1111, a splicing block 112, a second mounting hole 1121, a clearance hole 1122, a first connecting hole 113, a first branch hole 1131, a second branch hole 1132, a receiving cavity 114, a slide hole 115, a keyway 116, a stepped surface 117, a movable block 12, a second connecting hole 121, a threaded hole 122, a flat surface 123, an elastic element 13, and a sliding element 14.

[0038] Drive shaft 20, handle 21, recess 211, rod 22, head 23. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] For ease of understanding and concise description, the following text will explain the coupling structure and the transmission device with the coupling structure together, and the beneficial effects will not be discussed again.

[0041] Please refer to Figures 1 to 3 , Figure 1 This is an exploded view of the coupling structure in the embodiments provided in this application; Figure 2 This is a cross-sectional view of the coupling structure in a first state in the embodiments provided in this application; Figure 3 This is a cross-sectional view of the coupling structure in the second state in the embodiments provided in this application. Figures 1 to 3 The drive shaft 20 connected to the coupling structure 10 is shown in both cases.

[0042] In this embodiment, the coupling structure 10 includes a connecting sleeve 11, a movable block 12, and an elastic element 13.

[0043] One end of the connecting sleeve 11 has a first connecting hole 113, and the other end of the connecting sleeve 11 has a receiving cavity 114 that penetrates the end face of the connecting sleeve 11. It can be understood that the end through which the receiving cavity 114 penetrates is the end face of the connecting sleeve 11 that is away from the first connecting hole 113.

[0044] The movable block 12 is located in the receiving cavity 114 of the connecting sleeve 11. The movable block 12 and the connecting sleeve 11 are connected in the circumferential direction and in the axial direction. The movable block 12 has a second connecting hole 121.

[0045] One end of the elastic element 13 abuts against the connecting sleeve 11, and the other end of the elastic element 13 abuts against the movable block 12. The elastic element 13 is always in a compressed state.

[0046] The coupling structure 10 can be used in applications that transmit torque. Specifically, it is connected between two shafts to realize torque transmission between the two shafts. The first connecting hole 113 and the second connecting hole 121 of the coupling structure 10 can be connected to the two shafts respectively to realize power transmission between the two shafts.

[0047] In this embodiment, the transmission device includes the aforementioned coupling structure 10, a drive component, and a transmission shaft 20. The first connecting hole of the coupling structure 10 is tightly fitted with the power output shaft of the drive component, and the power output shaft can be fixedly inserted into the first connecting hole 113. The transmission shaft 20 is inserted into the second connecting hole 121 of the coupling structure 10 and is circumferentially limited and connected to the movable block 12. In application, the transmission shaft 20 is inserted into the product being adjusted, and the torque of the power output shaft is transmitted to the transmission shaft 20 through the coupling structure 10, so that the transmission shaft 20 can drive the product being adjusted to rotate.

[0048] In the coupling structure 10 using the above scheme, the movable block 12 and the connecting sleeve 11 are connected in the circumferential direction. The movable block 12 can rotate together with the connecting sleeve 11, thereby ensuring torque transmission. At the same time, an elastic element 13 that is always in a compressed state is provided between the movable block 12 and the connecting sleeve 11, and the movable block 12 can slide axially relative to the connecting sleeve 11. In this way, when the drive shaft 20 connected to the second connecting hole 121 of the movable block 12 is inserted into the product being adjusted, the elastic force of the elastic element 13 allows the axially sliding movable block 12 to push the drive shaft 20 into the product being adjusted, so that the insertion and engagement of the drive shaft 20 and the product being adjusted has elastic movement space, rather than a hard engagement, which is less likely to cause damage to the product being adjusted. At the same time, when the product being adjusted is rotated by the coupling structure 10, the movable block 12 has axial extension and retraction movement under the action of the elastic element 13, which can ensure that the depth of the drive shaft 20 inserted into the product being adjusted is in a suitable position, ensuring the reliability of rotating the product being adjusted. When the operation of the product being adjusted is completed and the drive shaft 20 is disengaged from the product being adjusted, the action of the elastic element 13 also prevents the drive shaft 20 from driving the product being adjusted.

[0049] Please refer to this as well. Figures 4 to 10 , Figure 4 for Figure 1 Structural diagram of the connecting sleeve; Figure 5 for Figure 4 Structural diagram of the inner casing; Figure 6 for Figure 5 The cross-sectional view of the main body shown; Figure 7 for Figure 4 Structural diagram of the middle splicing block; Figure 8 for Figure 4 Perspective view of the central panel; Figure 9 for Figure 1 Structure diagram of the active block; Figure 10 for Figure 1 A perspective view of the active block.

[0050] In one implementation, the peripheral wall of the connecting sleeve 11 is provided with a slide hole 115 extending in the circumferential direction, and the movable block 12 is equipped with a slider 14. At least a portion of the slider 14 protrudes radially outward from the outer peripheral wall of the movable block 12, and at least a portion of the slider 14 extends into the slide hole 115 and can slide along the slide hole 115.

[0051] After the above settings, the axial sliding of the movable block 12 in the accommodating cavity 114 of the connecting sleeve 11 is achieved by the sliding engagement of the sliding member 14 and the slide hole 115. This can both limit the axial sliding range of the movable block 12 and guide the sliding of the movable block 12, ensuring that the transmission shaft 20 connected to the movable block 12 can float in the axial direction.

[0052] In a specific implementation, at least a portion of the sliding member 14 also protrudes radially inward from the inner peripheral wall of the movable block 12. With this configuration, when the coupling structure 10 is applied to a transmission device and cooperates with the transmission shaft 20, a recess 211 can be provided in the handle 21 of the second connecting hole 121 of the transmission shaft 20 into the movable block 12, so that the sliding member 14 can abut against the recess 211.

[0053] In some embodiments, the drive shaft 20 and the second connecting hole 121 of the movable block 12 can be clearance-fitted, allowing the drive shaft 20 to have a certain floating angle range in the direction perpendicular to its axis. Thus, when the transmission device is used with the product being adjusted, even if the product being adjusted is not aligned with the drive shaft 20, the floating of the drive shaft 20 allows it to be inserted into the product without affecting power transmission. The position of the drive shaft 20 and the movable block 12 can be limited by a sliding member 14 abutting against the recess 211 of the drive shaft 20.

[0054] In some embodiments, the movable block 12 and the receiving cavity 114 of the connecting sleeve 11 can be clearance-fitted, allowing the movable block 12 and the connecting sleeve 11 to have a certain floating space in the radial direction. With this configuration, when the transmission device is used with the product being adjusted, even if the product being adjusted and the transmission shaft 20 connected to the movable block 12 are not aligned, the floating of the movable block 12 relative to the connecting sleeve 11 can still allow the transmission shaft 20 to be inserted into the product being adjusted without affecting power transmission.

[0055] In other embodiments, the movable block 12 can be clearance-fitted with the receiving cavity 114 of the connecting sleeve 11, and the shank 21 of the drive shaft 20 can also be clearance-fitted with the second connecting hole 121 of the movable block 12. In this way, the floating space of the movable block 12 and the floating space of the drive shaft 20 can be used to ensure that the drive shaft 20 can effectively cooperate with the product being adjusted to achieve power transmission.

[0056] In practice, the slide hole 115 penetrates the connecting sleeve 11 in the radial direction, which is convenient for processing and also facilitates the assembly of the sliding part 14 and the movable block 12.

[0057] The sliding member 14 can be made of a set screw. A threaded hole 122 can be made through the movable block 12 radially. The set screw is screwed into the threaded hole 122. A part of the set screw extends out of the movable block 12 to cooperate with the slide hole 115. A part of the set screw extends into the second connecting hole 121 of the movable block 12 to abut against the drive shaft 20.

[0058] In the illustrated embodiment, two sets of mutually cooperating slide holes 115 and sliding members 14 are provided, and the two sets are evenly arranged along the circumference of the connecting sleeve 11 and the movable block 12. In this way, both the stability of the movable block 12 sliding axially relative to the connecting sleeve 11 and the positioning effect of the sliding member 14 on the drive shaft 20 can be guaranteed.

[0059] In other embodiments, the cooperating slide holes 115 and sliders 14 may be provided in three, four or more sets.

[0060] In other embodiments, an abutment member may also be provided separately for radially abutting the drive shaft 20.

[0061] In one implementation, the outer peripheral wall of the movable block 12 includes at least one planar portion 123, and the cross-sectional shape of the receiving cavity 114 of the connecting sleeve 11 is consistent with the cross-sectional shape of the movable block 12.

[0062] In this way, the planar structure of the movable block 12's flat portion 123 and the corresponding planar structure of the accommodating cavity 114 can restrict the movable block 12 from rotating relative to the connecting sleeve 11, ensuring that the connecting sleeve 11 can drive the movable block 12 to rotate together when it rotates under the drive of the driving component.

[0063] In the illustrated embodiment, the movable block 12 has a racetrack-shaped cross-section and has two opposing flat portions 123 and two opposing curved portions; correspondingly, the accommodating cavity 114 of the connecting sleeve 11 also has a racetrack-shaped cross-section.

[0064] In other embodiments, the cross-sectional shape of the movable block 12 can be square or polygonal, etc., and the receiving cavity 114 of the connecting sleeve 11 is matched accordingly.

[0065] In a specific implementation, the second connecting hole 121 of the movable block 12 is circumferentially connected to the drive shaft 20, which can also be achieved through the cross-sectional shapes of the second connecting hole 121 and the drive shaft 20. For example, the hole wall of the second connecting hole 121 has at least one planar segment. In the illustrated example, the second connecting hole 121 of the movable block 12 is a hexagonal hole, and correspondingly, the handle 21 of the drive shaft 20 inserted into the second connecting hole 121 is a hexagonal prism structure. In this way, the drive shaft 20 is directly connected to the movable block 12, which is less likely to cause wear on the drive shaft 20 and can reduce costs.

[0066] In one implementation, the first connecting hole 113 of the connecting sleeve 11 is connected to the accommodating cavity 114, and the connection between the first connecting hole 113 and the accommodating cavity 114 forms a stepped surface 117 facing the movable block 12. One end of the elastic member 13 abuts against the stepped surface 117, and the other end of the elastic member 13 abuts against the end face of the movable block 12 facing the first connecting hole 113.

[0067] This facilitates the installation and positioning of the elastic element 13.

[0068] The radial dimension of the elastic element 13 is larger than the diameter of the first connecting hole 113 and also larger than the diameter of the second connecting hole 121, so as to ensure that the elastic force of the elastic element 13 can act between the movable block 12 and the connecting sleeve 11.

[0069] For example, the elastic element 13 can be a spring.

[0070] In one implementation, the connecting sleeve 11 includes a sleeve body 111 and a splicing block 112. A portion of the first connecting hole 113 is formed in the sleeve body 111, and a portion of the first connecting hole 113 is formed in the splicing block 112. The splicing block 112 and the sleeve body 111 are spliced ​​and fixed in the circumferential direction.

[0071] This design facilitates the fixed connection between the connecting sleeve 11 and the power output shaft of the drive component, ensuring that the power output shaft can directly drive the connecting sleeve 11 to rotate.

[0072] In the illustrated embodiment, the splicing block 112 is generally a semi-circular ring structure, and the sleeve body 111 has a generally semi-circular notch that matches the splicing block 112. The splicing block 112 has a second dividing hole 1132, and the sleeve body 111 has a first dividing hole 1131. After the splicing block 112 and the sleeve body 111 are docked and fixed, the first dividing hole 1131 and the second dividing hole 1132 dock to form a first connecting hole 113.

[0073] In a specific implementation, a first mounting hole 1111 is provided on the mating surface where the sleeve body 111 and the splicing block 112 are assembled, and a second mounting hole 1121 that mates with the first mounting hole 1111 is provided on the mating surface of the splicing block 112. After the sleeve body 111 and the splicing block 112 are assembled, they can be fixedly connected by fasteners (such as bolts, screws, etc.) inserted into the second mounting hole 1121 and the first mounting hole 1111.

[0074] Specifically, the splicing block 112 is also provided with a clearance hole 1122 communicating with the second mounting hole 1121, and the diameter of the clearance hole 1122 is larger than the diameter of the second mounting hole 1121. The clearance hole 1122 is provided to facilitate the fixed connection between the splicing block 112 and the sleeve body 111.

[0075] Please refer to this as well. Figure 11 , Figure 11 This is a perspective view of the splicing block in another embodiment.

[0076] In one implementation, a keyway 116 is further provided on the wall of the first connecting hole 113 of the connecting sleeve 11. In application, the power output shaft of the drive component that mates with the first connecting hole 113 is provided with a key that mates with the keyway 116.

[0077] In this way, based on the tight fit between the power output shaft and the first connecting hole 113, the keyway 116 and the key also cooperate to reliably limit the circumferential relative position of the power output shaft and the connecting sleeve 11, allowing for the transmission of larger torques between them. The cooperation of the keyway 116 and the key prevents slippage between the connecting sleeve 11 and the power output shaft when transmitting large torques.

[0078] Figure 11 In the illustrated embodiment, the keyway 116 is disposed on the splicing block 112. In other embodiments, the keyway 116 may also be disposed on the sleeve body 111.

[0079] Taking the application of the transmission device with the above-mentioned coupling structure 10 to the pressure regulation operation of the gas valve as an example, the application operation process and advantages of the above-mentioned coupling structure 10 and the transmission device with the coupling structure 10 are explained in more detail.

[0080] In the application scenario of pressure regulation operation of gas valve, the product being regulated is the pressure regulating valve of the gas valve. The regulating rod of the pressure regulating valve is directly connected to the drive shaft 20 of the transmission device. The regulating rod generally has an internal hexagonal hole. The drive shaft 20 of the transmission device can be selected from internal hexagonal screwdriver bits. The recess 211 of the shank 21 of the internal hexagonal screwdriver bit can cooperate with the sliding part 14 mounted on the movable block 12. The shank 21 of the internal hexagonal screwdriver bit is a hexagonal prism structure. The second connecting hole 121 of the movable block 12 can be provided with a matching hexagonal hole. The head 23 of the internal hexagonal screwdriver bit is a hexagonal prism structure that matches the internal hexagonal hole of the regulating rod.

[0081] In application, the coupling structure 10 is connected to the power component and the drive shaft 20 to form a transmission device. Specifically, the first connecting hole 113 of the connecting sleeve 11 of the coupling structure 10 is tightly fitted to the power output shaft of the drive component (e.g., a servo motor), so that when the power output shaft rotates, it can drive the connecting sleeve 11 to rotate, and drive the movable block 12, which is circumferentially limited to the connecting sleeve 11, to rotate together; the handle 21 of the drive shaft 20, which is opposite to the head 23, is inserted into the second connecting hole 121 of the movable block 12 and is circumferentially limited to the movable block 12, so that when the movable block 12 rotates, the drive shaft 20 also rotates together.

[0082] After the transmission device is assembled, the initial state of the coupling structure 10 is as follows: Figure 2 As shown, under the elastic action of the elastic member 13, the movable block 12 is in the extreme position away from the first connecting hole 113. At this time, the sliding member 14 abuts against the end wall of the slide hole 115 away from the first connecting hole 113.

[0083] During operation, the transmission device can be first pushed onto the regulating rod of the gas valve using a cylinder or other telescopic drive component. At this time, the coupling structure 10 is in the following state: Figure 3 As shown, the elastic element 13 buffers a portion of the force from the cylinder, and the movable block 12 drives the transmission shaft 20 to slide closer to the first connecting hole 113, preventing the adjusting rod from being damaged by impact. Then, the drive component of the transmission device drives the connecting sleeve 11 to rotate the movable block 12 and the transmission shaft 20 together. Because the transmission shaft 20 has a certain degree of spatial floating, even if the adjusting rod is not aligned with the transmission shaft 20, the transmission shaft 20 can still be accurately positioned with the adjusting rod. After the head 23 of the transmission shaft 20 is aligned with the inner hole of the adjusting rod, the elastic force of the elastic element 13 can be used to push the transmission shaft 20 into the inner hole of the adjusting rod, causing the adjusting rod to rotate and change its position to achieve pressure regulation of the gas valve. During pressure regulation, the elastic force of the elastic element 13 allows the transmission shaft 20 to move axially along with the adjusting rod, ensuring full contact between the two and ensuring power transmission. After pressure regulation is completed, the cylinder retracts and pulls out the transmission shaft 20.

[0084] As described above, when the coupling structure 10 is used for pressure regulation of the gas valve in the transmission device, the elastic force of the elastic element 13 can push the transmission shaft 20 into the inner hole of the adjusting rod, which is less likely to damage the product. During the pressure regulation rotation, the elastic element 13 can extend and retract to ensure that the depth of the transmission shaft 20 inserted into the adjusting rod is in the appropriate position, and the adjusting rod will not be driven when the transmission shaft 20 is withdrawn, which can improve the pressure regulation accuracy. At the same time, because the coupling structure 10 has a large elastic floating amount, it can reduce the misalignment of the two shafts and the error caused by product positioning, ensuring the reliability of alignment.

[0085] In addition, the coupling structure 10 can be directly connected to the standard hexagonal screwdriver bit that serves as the drive shaft 20, without requiring additional machining of the hexagonal screwdriver bit, thus reducing costs.

[0086] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A coupling structure, characterized in that, Includes connecting sleeve, movable block, and elastic element; One end of the connecting sleeve has a first connecting hole, and the other end of the connecting sleeve has a receiving cavity that penetrates the end face of the connecting sleeve; The movable block is located within the accommodating cavity. The movable block and the connecting sleeve are connected in the circumferential direction at an upper limit. The movable block and the connecting sleeve are slidably connected in the axial direction. The movable block has a second connecting hole. One end of the elastic element abuts against the connecting sleeve, and the other end of the elastic element abuts against the movable block. The elastic element is always in a compressed state.

2. The coupling structure according to claim 1, characterized in that, The peripheral wall of the connecting sleeve has a slide hole extending axially. The movable block is equipped with a sliding member. At least a portion of the sliding member protrudes radially outward from the outer peripheral wall of the movable block. At least a portion of the sliding member extends into the slide hole and is able to slide along the slide hole.

3. The coupling structure according to claim 2, characterized in that, At least a portion of the slider protrudes radially inward from the inner peripheral wall of the movable block.

4. The coupling structure according to claim 2 or 3, characterized in that, The sliding component is a set screw, which is threadedly connected to the movable block.

5. The coupling structure according to claim 1, characterized in that, The outer peripheral wall of the movable block includes at least one planar portion, and the cross-sectional shape of the accommodating cavity is consistent with the cross-sectional shape of the movable block.

6. The coupling structure according to claim 1, characterized in that, The first connecting hole communicates with the accommodating cavity, and the connection between the first connecting hole and the accommodating cavity forms a stepped surface facing the movable block. One end of the elastic member abuts against the stepped surface, and the other end of the elastic member abuts against the end face of the movable block facing the first connecting hole.

7. The coupling structure according to any one of claims 1-6, characterized in that, The connecting sleeve includes a sleeve body and a splicing block. A portion of the first connecting hole is formed in the sleeve body, and a portion of the first connecting hole is formed in the splicing block. The splicing block is spliced ​​and fixed to the sleeve body in the circumferential direction.

8. The coupling structure according to any one of claims 1-6, characterized in that, The first connecting hole has a keyway on its wall.

9. A transmission device, characterized in that, It includes a drive component, a transmission shaft, and a coupling structure, wherein the coupling structure is the coupling structure according to any one of claims 1-8, the output shaft of the drive component is tightly fitted with the first connecting hole, the transmission shaft is inserted into the second connecting hole, and is circumferentially limited and connected to the movable block.

10. The transmission device according to claim 9, characterized in that, The drive shaft is clearance-fitted with the second connecting hole, and / or the movable block is clearance-fitted with the accommodating cavity.

11. The transmission device according to claim 9 or 10, characterized in that, The portion of the drive shaft that inserts into the second connecting hole has a recess, and the movable block is fitted with a set screw, which abuts against the recess radially.

Images