Hydraulic expansion connecting structure of zigzag spring coupling

Abstract

The hydraulic expansion connecting structure of the zigzag spring coupler comprises a shaft hub, the shaft hub is provided with a shaft joint and a fluted disc which are coaxially arranged, the shaft joint and the fluted disc are integrally formed, a shaft hole is formed in the center of the shaft hub, an oil cavity surrounding the shaft hole is formed in the shaft hub, and at least one communicating hole communicating with the oil cavity and an oil injection hole are formed in the shaft joint; a sealing assembly; each pressure supplementing assembly comprises a piston, a rebound assembly and a pressure supplementing fixing piece, and the pistons, the rebound assemblies and the pressure supplementing fixing pieces are sequentially and coaxially arranged from inside to outside along the hole axes of the communicating holes. According to the zigzag spring coupling, volume changes and pressure changes caused by temperature differences can be compensated, the stability of hydraulic pressure in the shaft hub can be maintained, performance fluctuation caused by the temperature difference changes is reduced, meanwhile, the contact pressure between the shaft hub and the shaft body is maintained within the normal working range, and the connection stability and reliability of the zigzag spring coupling are guaranteed.

Description

Technical Field

[0001] The present application relates to the field of serpentine spring couplings, and in particular to a hydraulic expansion connection structure of serpentine spring couplings. Background Art

[0002] The serpentine spring coupling is a shaft connection transmission component that relies on a serpentine spring to transmit torque. It mainly consists of two hubs and a serpentine spring. The hub and the shaft body are connected by hydraulic expansion. By injecting high-pressure oil into the oil storage chamber inside the hub, the part of the hub surrounding the shaft body expands evenly, thereby holding the shaft body and realizing the connection between the hub and the shaft body.

[0003] In actual installation scenarios, there may be a variety of reasons that cause temperature differences in the medium inside the hub, such as changes in ambient temperature, heat generated during equipment operation, installation methods involving heating the hub or cooling the shaft, changes in load during shaft transmission, etc. Temperature differences will affect the expansion coefficient of the medium, resulting in insufficient contact pressure between the hub and the shaft, reducing the connection stability between the hub and the shaft, and the shaft may produce relative displacement, increasing vibration and energy consumption, affecting system performance and transmission accuracy, while aggravating wear and affecting the service life of the spring coupling. Summary of the invention

[0004] One advantage of the present application is that it provides a hydraulic expansion connection structure of a serpentine spring coupling to solve or at least partially alleviate the problems in the related art such as the temperature difference of the oil body in the hub, which affects the expansion coefficient of the oil body and the contact pressure between the hub and the shaft body, and reduces the connection stability between the hub and the shaft body.

[0005] Another advantage of the present application is that it provides a hydraulic expansion connection structure of a snake spring coupling, wherein at least one connecting hole and an oil filling hole are arranged on the shaft joint of the hub, a sealing assembly is arranged in the oil filling hole, and a pressure compensation assembly is arranged in the connecting hole, and the hydraulic cavity is cooperated to form a buffer space capable of accommodating media of different volumes, thereby compensating for volume changes and pressure changes caused by temperature differences, helping to maintain the stability of the hydraulic pressure inside the hub, reducing performance fluctuations caused by temperature differences, and at the same time maintaining the contact pressure between the hub and the shaft body within a normal working range, thereby ensuring the connection stability and reliability of the snake spring coupling.

[0006] Another advantage of the present application is that it provides a hydraulic expansion connection structure of the serpentine spring coupling, wherein the connecting holes are all located at the upper part of the shaft joint of the shaft hub, and the oil filling holes are located at the lower part of the shaft joint of the shaft hub. When injecting, the medium is injected from the bottom of the hydraulic chamber, which is conducive to achieving uniform distribution of the medium in the hydraulic chamber, reducing the generation of bubbles and the mixing of impurities, and ensuring the cleanliness and lubrication of the medium.

[0007] Another advantage of the present application is that it provides a hydraulic expansion connection structure of a serpentine spring coupling, wherein the pressure-compensating component is configured by setting a rebound component between the piston and the pressure-compensating fixing member, so that the piston can move in the connecting hole when the medium expands or contracts, thereby achieving regulation of the pressure in the hydraulic chamber, effectively coping with internal pressure fluctuations caused by temperature changes, and facilitating maintaining pressure balance in the hydraulic chamber.

[0008] One or more embodiments of the present application provide a hydraulic expansion connection structure of a serpentine spring coupling, which adopts the following technical solution:

[0009] The hydraulic expansion connection structure of the snake spring coupling includes:

[0010] A shaft hub, wherein the shaft hub has a shaft section and a toothed disc coaxially arranged, the two are integrally formed and have a shaft hole at the center for inserting the shaft body, the toothed disc has a plurality of tooth grooves, a hydraulic cavity surrounding the shaft hole is arranged in the shaft hub, at least one connecting hole and an oil injection hole are opened on the shaft section, and the connecting hole and the oil injection hole are both connected to the hydraulic cavity;

[0011] A sealing assembly disposed in the oil filling hole; and

[0012] A pressure-compensating assembly is arranged in each of the connecting holes, and the pressure-compensating assembly includes a piston, a rebound assembly and a pressure-compensating fixing piece. The piston, the rebound assembly and the pressure-compensating fixing piece are coaxially arranged in sequence from the inside to the outside along the hole axis of the connecting hole.

[0013] In some embodiments, the resilient assembly is a stacked spring assembly.

[0014] In some embodiments, at least two of the communication holes are located at the upper portion of the shaft joint, and the oil filling hole is located at the lower portion of the shaft joint.

[0015] In some embodiments, the hole axis of the connecting hole and the hole axis of the oil injection hole both intersect the axis of the shaft hole at right angles.

[0016] In some embodiments, when the number of the connecting holes is two, the two connecting holes are arranged in parallel along the axial direction or along the circumferential direction on the shaft section.

[0017] In some embodiments, when the number of the coupling holes exceeds two, a plurality of the connecting hole arrays are distributed on the shaft section to form an array area.

[0018] In some embodiments, when the number of the connecting holes in the same circumferential distribution is odd, on the radial projection surface of the hub, the projected hole axis of at least one of the connecting holes and the projected hole axis of the oil filling hole are connected to form a straight line.

[0019] In some embodiments, on the radial surface of the hub, a midline of the projection of the array area is connected to the axis of the oil injection hole to form a straight line.

[0020] In some embodiments, the sealing assembly includes a sealing steel ball and a sealing fixing member sequentially arranged from the inside to the outside along the hole axis of the oil filling hole, the oil filling hole includes a connecting section, a hemispherical section and a fixing section which are sequentially connected, the connecting section is connected to the hydraulic chamber, the hemispherical section accommodates the sealing steel ball, and the sealing fixing member is sealed and fixed to the fixing section and abuts against the sealing steel ball;

[0021] The apertures of the connecting section, the hemispherical section and the fixing section increase in sequence.

[0022] The present application also provides a snake spring coupling, comprising:

[0023] The hydraulic expansion connection structure of the serpentine spring coupling as described above; and

[0024] A snake spring is embedded in the tooth grooves of the two toothed discs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0026] Figure 1 It is a schematic diagram of the hydraulic expansion connection structure of the serpentine spring coupling according to some embodiments of the present application.

[0027] Figure 2 It is an exploded schematic diagram of the hydraulic expansion connection structure of the serpentine spring coupling according to some embodiments of the present application.

[0028] Figure 3 It is a schematic structural diagram of the connecting holes and the oil filling holes on the radial projection surface of the hub according to some embodiments of the present application.

[0029] Figure 4 for Figure 3 Enlarged view of part A.

[0030] Figure 5 for Figure 3 Enlarged view of part B.

[0031] Figure 6 It is a schematic diagram of the structure of a stacked spring assembly according to some embodiments of the present application.

[0032] Figure 7 Schematic diagram of the piston structure according to some embodiments of the present application.

[0033] Figure 8 It is a schematic diagram of the hydraulic expansion connection structure of a serpentine spring coupling having two circumferentially parallel connecting holes according to the second embodiment of the present application.

[0034] Fig. 9 It is a schematic structural diagram of the connecting hole and the oil filling hole on the radial projection surface of the hub according to the second embodiment of the present application.

[0035] Fig.10 It is a schematic diagram of the hydraulic expansion connection structure of a serpentine spring coupling with a keyway and four connecting holes according to the third embodiment of the present application.

[0036] Fig.11 It is a schematic structural diagram of the connecting holes and the oil filling holes on the radial projection surface of the hub according to the third embodiment of the present application.

[0037] Fig.12 It is a schematic diagram of the hydraulic expansion connection structure of a serpentine spring coupling with nine connecting holes according to the fourth embodiment of the present application.

[0038] Fig.13 It is a schematic structural diagram of the connecting holes and the oil filling holes on the radial projection surface of the hub according to the third embodiment of the present application.

[0039] In the figure: 10, hub; 11, shaft joint; 12, gear plate; 111, connecting hole; 1111, connecting section; 1112, pressure-compensating section; 1113, threaded fixing section; 112, oil filling hole; 1121, connecting section; 1122, hemispherical section; 1123, fixing section; 101, shaft hole; 102, hydraulic chamber; 1011, keyway; 1021, recessed section; 20, sealing assembly; 21, sealing steel ball; 22, sealing fixing piece; 30, pressure-compensating assembly; 31, piston; 311, mounting groove; 312, sealing ring; 32, stacked spring assembly; 321, stacked spring component; 33, pressure-compensating fixing piece. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings showing multiple embodiments of the present application. It should be understood that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in this field without spending creative work will fall within the scope of protection of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those generally understood by technicians in the technical field of this application; the terms used in the specification of the application are only for the purpose of describing specific implementation methods, and are not intended to limit this application; the terms "including", "comprising", "having", "having", "containing", "including", etc. in the specification and claims of this application and the above-mentioned figure description are open-ended words. Therefore, "including", "comprising", "having" and "having" are, for example, a method or device of one or more steps or elements, which has one or more steps or elements, but is not limited to having only these one or more elements. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "multiple" is two or more.

[0042] In the description of the present application, it should be understood that the terms "center", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0045] As mentioned above, it should be emphasized that when the term "includes / comprising" is used in this specification, it is used to clearly indicate the existence of the features, integers, steps or components, but does not exclude the existence or addition of one or more other features, integers, steps, components or groups of features, integers, steps, components. As used in this application, the singular forms "a", "an" and "the" also include plural forms, unless the context clearly indicates otherwise.

[0046] The words "a" and "an" in this specification may mean one, but may also be consistent with the meaning of "at least one" or "one or more". The term "about" generally means plus or minus 10% of the mentioned value, or more specifically plus or minus 5%. The term "or" used in the claims means "and / or" unless it is clearly stated that it refers to only alternative solutions.

[0047] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0048] One or more embodiments of the present application disclose a hydraulic expansion connection structure of a serpentine spring coupling. Figure 1-13 The hydraulic expansion connection structure of the snake spring coupling includes a hub 10, a sealing assembly 20 and a pressure compensation assembly 30. The hub 10 has a shaft section 11 and a toothed disc 12 coaxially arranged along its own axis. The two are integrally formed and have a shaft hole 101 at the center for inserting the shaft body. The toothed disc 12 has a plurality of tooth grooves for accommodating the snake spring. A hydraulic cavity 102 surrounding the shaft hole 101 is provided in the hub 10. At least two connecting holes 111 and an oil injection hole 112 are provided on the shaft section 11. The connecting hole 111 and the oil injection hole 112 are both connected to the hydraulic cavity 102.

[0049] The sealing assembly 20 is arranged in the oil filling hole 112. The pressure compensation assembly 30 arranged in each of the connecting holes 111 includes a piston 31, a rebound assembly and a pressure compensation fixing piece 33. The piston 31, the rebound assembly and the pressure compensation fixing piece 33 are coaxially arranged in sequence from the inside to the outside along the hole axis of the connecting hole 111.

[0050] The shaft body extends into the shaft hole 101 of the shaft hub 10, and the contact pressure generated by the expansion of the medium in the hydraulic chamber 102 is used to hold the shaft body tightly, thereby realizing the installation of the shaft body and the shaft hub 10. During the installation and shaft transmission and rotation process, the shaft hub will produce a certain temperature difference change, resulting in a change in the expansion coefficient of the medium in the hydraulic chamber 102, thereby affecting the contact pressure and connection stability between the shaft body and the shaft hub 10.

[0051] In the hydraulic expansion connection structure of the snake spring coupling of the present application, the shaft section 11 of the hub 10 is provided with at least two connecting holes 111 and one oil filling hole 112. The connecting hole 111 and the oil filling hole 112 are both connected with the hydraulic cavity 102 in the hub 10 to form a space connecting the inside of the hub 10 with the outside. The sealing assembly 20 arranged in the oil filling hole 112 is then used to seal the oil filling hole 112. The pressure compensation assembly 30 arranged in each of the connecting holes 111 cooperates with the hydraulic cavity 102 to form a buffer space capable of accommodating media of different volumes, compensates for the volume and pressure caused by the temperature difference, helps to maintain the stability of the hydraulic pressure inside the hub, effectively copes with the internal pressure fluctuation caused by the temperature difference, reduces the performance fluctuation caused by the temperature difference, and at the same time maintains the contact pressure between the hub and the shaft body within the normal working range, thereby ensuring the connection stability and reliability of the snake spring coupling.

[0052] When the temperature rises, the medium expands, and the hydraulic chamber 102 itself provides additional space to accommodate the expansion of the medium to prevent the pressure from being too high. As the pressure in the hydraulic chamber 102 increases, the piston 31 in the pressure compensation component 30 moves in the connecting hole 111 toward the outside of the hole, squeezing the rebound component to play a buffering role. When the temperature drops, the medium contracts, and the hydraulic chamber 102 absorbs excess space to prevent the pressure from being too low. As the pressure in the hydraulic chamber 102 decreases, the pressure on the piston 31 decreases, and the rebound component squeezes the piston 31 toward the inside of the hole to adjust the pressure in the hydraulic chamber 102, playing a role of pressure compensation, thereby effectively coping with internal pressure fluctuations caused by temperature changes.

[0053] The medium in the hydraulic cavity 102 can be implemented as a medium with a certain fluidity such as grease, lubricating oil, synthetic oil, or a solid lubricating medium that is greatly affected by temperature difference. The specific choice of the medium is determined according to the actual working scenario of the snake spring coupling.

[0054] In the present application, the hole axis of the shaft hole 101 of the hub 10 is taken as the axis of the hub 10, the extension direction of the axis is the axial direction of the hub 10, the extension direction of the circumferential wall of the shaft joint 11 of the hub 10 is taken as the axial direction, the plane perpendicular to the axis of the hub 10 is the radial surface of the hub 10 or the radial surface of the shaft joint 11, and the plane parallel to the end surface of the shaft joint 11 or the end surface of the gear disk 12 can also be defined as the radial surface of the shaft joint. The above-mentioned radial surfaces can all be used as radial projection surfaces, wherein the direction formed by extending on the radial surface with a certain point on the axis of the hub 10 as the starting point is the radial direction.

[0055] In some embodiments of the present application, the rebound assembly is implemented as a stacked spring assembly 32, which is composed of multiple stacked spring components 321 coaxially connected in sequence. The two ends of the stacked spring assembly 32 respectively abut the bottom end of the pressure-compensating fixture 33 and the top end of the piston 31, providing high stiffness and good buffering and vibration absorption performance between the piston 31 and the pressure-compensating fixture 33. The stacked spring assembly 32 has a higher load-to-size ratio and can provide a larger elastic force in a smaller space. When the medium shrinks, it can provide a rebound force to the piston 31 in time, so that it moves toward the inside of the hole for pressure compensation, thereby ensuring the connection stability of the snake spring coupling.

[0056] Specifically, a recessed mounting groove 311 is provided at the top end of the piston 31 for embedding the stacked spring assembly 32. When the piston 31 moves in the connecting hole 111 due to the change in the pressure in the hydraulic chamber 102, the stacked spring assembly 32 is embedded in the mounting groove 311 of the piston 31 and couples the piston 31 and the pressure-compensating fixture 33, thereby providing stable force transmission between the piston 31 and the pressure-compensating fixture 33, so that the pressure-compensating assembly 30 composed of the three can achieve stable pressure regulation in a smaller space, thereby reducing the adverse effects of vibration and impact on the entire pressure-compensating assembly 30.

[0057] More specifically, a sealing ring 312 is also provided on the outer side of the piston 31 to prevent the piston 31 from deforming itself during the pressure adjustment process and causing a gap between the piston 31 and the hole wall of the connecting hole 111, thereby reducing the risk of pressure release, and facilitating maintaining the pressure balance in the hydraulic chamber 102 and ensuring the contact pressure between the hub 10 and the shaft body.

[0058] Next, the connecting hole 111 and the oil filling hole 112 are described in detail.

[0059] like Figure 1 As shown, the shaft section 11 of the shaft hub 10 has an annular curved surface and an end surface. In some embodiments of the present application, at least two openings of the connecting holes 111 and one opening of the oil injection hole 112 are both located on the annular curved surface of the shaft section 11, and both extend along the radial direction of the shaft section 11 to connect to the hydraulic chamber 102. Among them, the hole axis of the connecting hole 111 and the hole axis of the oil injection hole 112 are perpendicularly intersected with the axis of the shaft section 11 of the shaft hub 10, but do not overlap, so as to avoid the pressure adjustment process of the connecting hole 111 having an adverse effect on the sealing effect of the oil injection hole 112.

[0060] In some optional embodiments, at least two openings of the connecting hole 111 and one opening of the oil injection hole 112 may also be implemented to be located on the end face of the shaft joint 11, and both extend along an axis parallel to the axis of the shaft joint 11 to connect to the hydraulic chamber 102, wherein the hole axis of the connecting hole 111 and the hole axis of the oil injection hole 112 are both parallel to the axis of the shaft joint 11 of the hub 10, but do not overlap.

[0061] In some optional embodiments, at least two openings of the connecting holes 111 and one opening of the oil injection hole 112 can be implemented on the annular surface or the end surface of the shaft joint 11, and the hole depth extension directions of the connecting hole 111 and the oil injection hole 112 are both located on or partially located on the radial surface of the shaft joint 11, but do not overlap.

[0062] In some embodiments of the present application, at least two of the connecting holes 111 are concentratedly distributed on the upper part of the shaft section 11 of the shaft hub 10, forming a hole or a sector-shaped area located on the radial projection surface of the shaft hub 10, and the oil injection hole 112 is located at the lower part of the shaft section 11. The medium enters the hydraulic chamber 102 from the oil injection hole 112 and is evenly distributed in the hydraulic chamber 102 to an ideal liquid level. The upper and lower distribution of the connecting hole 111 and the oil injection hole 112 provides a good ventilation volume and pressure environment for the injection and distribution process of the medium, which is conducive to ensuring the flow performance of the medium, while keeping the medium in the hydraulic chamber 102 clean and lubricated.

[0063] Among them, the connecting position of the oil filling hole 112 and the hydraulic chamber 102 is located at the lowest point of the hydraulic chamber 102. During the injection and discharge of the medium in the hydraulic chamber 102, the medium is more likely to enter or be discharged from the hydraulic chamber 102 by gravity. During the injection from the lowest point, the bubbles generated in the medium rise due to their low density and thus gather at the top of the medium. At the same time, the injection process reduces the mixing of impurities and ensures the cleanliness of the medium.

[0064] Specifically, the direction and position of the oil injection hole 112 are determined according to actual installation and design requirements. In some optional embodiments, the orifice of the oil injection hole 112 is located at the bottom of the shaft section 11, and the hole axis of the oil injection hole 112 or part of the hole axis is as close to the vertical line as possible, further improving the injection effect of the medium.

[0065] like Figure 3As shown, the oil filling hole 112 is implemented as an oil filling hole 112 with a vertical hole axis and a downward opening, and the connection position between the oil filling hole 112 and the hydraulic chamber 102 is located at the lowest point of the hydraulic chamber 102, wherein the sealing assembly 20 is assembled in the oil filling hole 112, and the sealing assembly 20 includes a sealing steel ball 21 and a sealing fixing member 22 which are sequentially arranged from the inside to the outside along the hole axis of the oil filling hole 112, the diameter of the sealing steel ball 21 is larger than the size of the connection port between the oil filling hole 112 and the hydraulic chamber 102, so as to seal the oil filling hole 112, the sealing fixing member 22 is threadedly connected to the orifice of the oil filling hole 112, and abuts against the sealing steel ball 21 at the inner end, so as to fix the sealing steel ball 21 at the position of the oil filling hole 112 to ensure its sealing effect.

[0066] Specifically, the oil filling hole 112 has a connecting section 1121, a sealing section 1122 and a fixing section 1123 which are connected in sequence. The connecting section 1121 is connected to the hydraulic chamber 102. The inner wall curved surface of the sealing section 1122 is adapted to the shape of the sealing steel ball 21. The inner wall of the fixing section 1123 is provided with a thread adapted to the sealing fixing member 22. The apertures of the connecting section 1121, the sealing section 1122 and the fixing section 1123 increase in sequence. The diameter of 1121 is smaller than the diameter of the sealing section 1122, so that the sealing steel ball 21 can block the connecting section 1121 when it fits the inner curved surface of the sealing section 1122 to achieve a sealing effect; the diameter of the fixing section 1123 is not smaller than the tail end diameter of the hemispherical section 1122, providing an exit space for the sealing steel ball 21. When the sealing fixing part 22 is loosened or removed, the sealing steel ball 21 falls freely, thereby achieving unsealing and facilitating the discharge of the medium.

[0067] like Figure 3 and Figure 5 As shown, the sealing section 1122 of the oil injection hole 112 is implemented as a conical section and a cylindrical section arranged in sequence from the inside to the outside, the diameter of the conical section gradually increases in the direction toward the outside of the hole, and the diameter of the cylindrical section is equal to the diameter of the tail end of the conical section and is equal to the diameter of the sealing steel ball 21, so as to achieve a sealing effect. In some optional embodiments, the sealing section 1122 of the oil injection hole 112 can be implemented as a hemispherical section adapted to the sealing steel ball 21, and the diameter of the hemispherical section gradually increases in the direction toward the outside of the hole.

[0068] More specifically, the sealing fixing member 22 and the pressure-compensating fixing member 33 can be implemented as bolts, nuts or other fixing parts.

[0069] In some embodiments of the present application, the connecting position between the connecting hole 111 and the hydraulic chamber 102 is located at the upper part of the hydraulic chamber 102. During the process of injecting the medium through the oil filling hole 111 located at the bottom, it assists in exhausting air and impurities and reducing the generation of bubbles. At the same time, since the connecting hole 111 is located at the upper part, the medium naturally flows downward under the action of gravity during the injection process, which helps to evenly distribute the medium in the hydraulic chamber 102 and reduce the risk of medium leakage.

[0070] Specifically, the connecting hole has a connecting section 1111, a pressure supplementing section 1112 and a threaded fixing section 1113 arranged from inside to outside. Figure 3-4 As shown, the connecting section 1111 is connected to the hydraulic chamber 102, the inner wall of the pressure-compensating section 1112 is sealed and connected to the outer side of the piston 31, and the inner wall of the threaded fixing section 1113 is provided with a thread matched with the pressure-compensating fixing piece 33, wherein the aperture of the connecting section 1111 is smaller than the aperture of the pressure-compensating section 1112 and the aperture of the threaded fixing section 1113, so as to facilitate the movement of the piston 31 in the pressure-compensating section 1112, thereby realizing pressure regulation.

[0071] When the number of the connecting holes 111 is two, the two connecting holes 111 are arranged in parallel on the shaft section 11 along the axial direction or along the circumferential direction. Figure 1-5 as well as Figure 8-9 As shown, when the two connecting holes 111 are axially arranged in parallel on the upper part of the shaft joint 11, the projections of the two connecting holes 111 on the radial projection surface of the shaft hub 10 overlap; when the two connecting holes 111 are circumferentially arranged in parallel on the upper part of the shaft joint 11, the areas formed by the two side edges of the two connecting holes 111 along the circumferential direction are fan-shaped areas on the radial projection surface of the shaft hub 10.

[0072] When the number of the communication holes 111 is greater than two, a plurality of the communication holes 111 are distributed in an array on the shaft section 11 to form an array area, such as Figure 10-13 As shown, among the multiple connecting holes 111, the projections of the connecting holes 111 located in the same axial direction on the radial projection surface of the hub 10 overlap, and the fan-shaped area formed by the projections of the connecting holes 111 located in the same circumferential direction on the radial projection surface of the hub 10 is the fan-shaped area formed by the projection of the array area on the radial projection surface.

[0073] Furthermore, on the radial projection surface of the hub, the projected hole axis of at least one of the connecting holes 111 is connected to the projected hole axis of the oil filling hole in a straight line to maintain the uniformity of expansion and contraction of the medium in the hydraulic chamber 102 under temperature changes, which is beneficial to improving the pressure regulation effect, avoiding the risk of local overheating and wear, and reducing the adverse effects of changes in the local medium expansion coefficient.

[0074] In some optional embodiments, the midline of the fan-shaped area formed by the projection of the array area on the radial projection plane is connected to the hole axis of the projection of the oil filling hole 112 on the radial projection plane to form a straight line, so that the array area formed by the multiple connecting holes has a certain symmetry in the upper part of the shaft section 11, which is conducive to the uniform distribution of the medium in the hydraulic cavity 102. When the medium expands or contracts due to temperature changes, the uniform transmission of the pressure change in the hydraulic cavity 102 is ensured, the pressure balance in the cavity is maintained, and the risk of excessive or low local pressure is reduced.

[0075] In some specific examples, the number of the connecting holes 111 is four, such as Figure 10-11 As shown, the four connecting holes 111 are distributed in a 2*2 array on the top of the shaft section 11, that is, there are two connecting holes 11 distributed along the same circumferential direction, and there are two connecting holes 11 distributed along the same axial direction, wherein, on the radial projection surface of the hub, the projected hole axes of the two connecting holes 111 located in one axial direction are connected to the projected hole axes of the oil filling hole in a straight line, or the array area formed by the four connecting holes 111 is projected on the radial projection surface of the hub 10 to form a fan-shaped area, and the midline of the fan-shaped area is connected to the radial projection hole axis of the oil filling hole 112 in a straight line.

[0076] In some specific examples, the number of the communication holes 111 is nine, such as Figure 12-13 As shown, the nine connecting holes 111 are distributed in a 3*3 array at the top of the shaft section 11, that is, there are three connecting holes 11 distributed along the same circumferential direction, and there are three connecting holes 11 distributed along the same axial direction, among which the projections of the three connecting holes 111 located in the middle axial direction on the radial projection surface of the hub 10 coincide, and the hole axis of their projections is connected to the hole axis of the radial projection of the oil filling hole 112 in a straight line.

[0077] Furthermore, the aperture of the connecting holes 111 decreases as the number of the connecting holes 111 increases, thereby improving the uniformity of pressure distribution while maintaining the total flow area, reducing the pressure loss of a single connecting hole 111, further improving the pressure regulation accuracy of the pressure compensation assembly 30 in each connecting hole 111, and at the same time improving the structural strength of the hub 10.

[0078] In some optional embodiments, the shaft hole 101 of the shaft hub 10 further has a keyway 1011, and the hydraulic chamber 102 in the shaft hub 10 has a recessed section 1021 surrounding the keyway 1011. Figure 10-11As shown, the keyway 1011 is located at the top of the shaft hole 101, and correspondingly, the recessed section 1021 is located at the top of the hydraulic chamber 102. All the connecting holes 111 are connected to the recessed section 1021 of the hydraulic chamber 102, so as to avoid excessive contact pressure between the keyway 1011 of the shaft hole 101 and the shaft body, ensure uniform distribution of the medium on the outside of the shaft body, achieve pressure balance inside the hub 10, more effectively regulate the internal pressure, and further improve the stability and reliability of the connection.

[0079] One or more embodiments of the present application also discloses a serpentine spring coupling, comprising two hydraulic expansion connection structures of the above-mentioned serpentine spring couplings, a serpentine spring embedded in the tooth grooves of the two toothed discs, and two interconnected half-cover bodies, the two half-cover bodies being sealed to the hydraulic expansion connection structure of the serpentine spring coupling and the outer side of the serpentine spring.

[0080] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. The hydraulic expansion connection structure of the snake spring coupling is characterized by: include: A shaft hub, wherein the shaft hub has a shaft section and a toothed disc coaxially arranged, the two are integrally formed and have a shaft hole at the center for inserting the shaft body, the toothed disc has a plurality of tooth grooves, a hydraulic cavity surrounding the shaft hole is arranged in the shaft hub, at least one connecting hole and an oil injection hole are opened on the shaft section, and the connecting hole and the oil injection hole are both connected to the hydraulic cavity; A sealing assembly disposed in the oil filling hole; and A pressure-compensating assembly is arranged in each of the connecting holes, and the pressure-compensating assembly includes a piston, a rebound assembly and a pressure-compensating fixing piece. The piston, the rebound assembly and the pressure-compensating fixing piece are coaxially arranged in sequence from the inside to the outside along the hole axis of the connecting hole.

2. The hydraulic expansion connection structure of the serpentine spring coupling according to claim 1, characterized in that: The rebound component is a stacked spring component.

3. The hydraulic expansion connection structure of the serpentine spring coupling according to claim 1, characterized in that: At least two of the communication holes are located at the upper part of the shaft joint, and the oil filling hole is located at the lower part of the shaft joint.

4. The hydraulic expansion connection structure of the serpentine spring coupling according to claim 3 is characterized in that: The hole axis of the connecting hole and the hole axis of the oil injection hole both intersect the axis of the shaft hole perpendicularly.

5. The hydraulic expansion connection structure of the serpentine spring coupling according to claim 1, characterized in that: When the number of the communication holes is two, the two communication holes are arranged in parallel on the shaft section along the axial direction or along the circumferential direction.

6. The hydraulic expansion connection structure of the serpentine spring coupling according to claim 1, characterized in that: When the number of the coupling holes exceeds two, a plurality of the connecting holes are arrayed on the shaft section to form an array area.

7. The hydraulic expansion connection structure of the serpentine spring coupling according to claim 4, characterized in that: On the radial projection surface of the hub, a hole axis of the projection of at least one of the connecting holes and a hole axis of the projection of the oil filling hole are connected to form a straight line.

8. The hydraulic expansion connection structure of the serpentine spring coupling according to claim 6, characterized in that: On the radial surface of the hub, the midline of the projection of the array area and the axis of the oil injection hole are connected to form a straight line. 。 9. The hydraulic expansion connection structure of the serpentine spring coupling according to claim 1, characterized in that: The sealing assembly comprises a sealing steel ball and a sealing fixing piece which are sequentially arranged along the hole axis of the oil filling hole from the inside to the outside, the oil filling hole comprises a connecting section, a hemispherical section and a fixing section which are sequentially connected, the connecting section is connected to the hydraulic chamber, the hemispherical section accommodates the sealing steel ball, and the sealing fixing piece is sealed and fixed to the fixing section and abuts against the sealing steel ball; The apertures of the connecting section, the hemispherical section and the fixing section increase in sequence.

10. Snake spring coupling, characterized in that: include: A hydraulic expansion connection structure of a serpentine spring coupling as described in any one of rights 1 to 19; and A snake spring is embedded in the tooth grooves of the two toothed discs.

Images