Hydraulic expansion coupling hub

Abstract

A hydraulic expansion coupling shaft hub comprises a shaft hub body and an adjusting assembly, the shaft hub body comprises a shaft disc and a shaft joint, the shaft joint comprises an inner shaft sleeve and an outer shaft sleeve, a shaft hole is formed in the inner side of the inner shaft sleeve, an annular hydraulic cavity and an annular containing cavity are formed between the inner shaft sleeve and the outer shaft sleeve, and the annular hydraulic cavity is filled with hydraulic oil; the adjusting assembly comprises an adjusting ring and an adjusting screw rod, the adjusting ring is arranged in the containing cavity in a sliding mode, the axial length of the containing cavity is larger than that of the adjusting ring, and the adjusting screw rod is installed in the adjusting hole. One end of the adjusting screw is suitable for abutting against the end face of the adjusting ring so as to adjust the oil pressure of hydraulic oil in the annular hydraulic cavity, and therefore the inner shaft sleeve tightly holds a shaft body arranged in the shaft hole.

Description

Technical Field

[0001] This invention relates to couplings, and more particularly to a hydraulically tightened coupling hub. Background Technology

[0002] A hydraulic coupling is a mechanical transmission device that uses hydraulic oil pressure to cause radial deformation of the inner bushing, thereby achieving a tight connection between the shaft hub and the shaft body. Existing hydraulic couplings typically use multiple screws distributed circumferentially to independently apply force, increasing the pressure within the hydraulic chamber. This structure uses each screw to screw into and compress hydraulic oil, thereby driving the inner bushing to expand and grip the shaft body.

[0003] However, existing technologies have the following drawbacks: First, because a large number of screws need to be driven circumferentially to achieve effective pressurization, the operation is cumbersome, the adjustment efficiency is low, and it is not suitable for applications requiring frequent disassembly and assembly. Second, the independent force application of each screw can easily lead to uneven pressure distribution within the hydraulic chamber, resulting in uneven stress on the inner bushing and affecting the reliability of the tightening connection and the stability of the shaft transmission. Third, the oil inlet sealing structure of existing couplings often uses simple plugs or gaskets, which have insufficient sealing reliability under high-pressure hydraulic oil, making them prone to leakage and affecting the working performance and service life of the hydraulic system. Summary of the Invention

[0004] One advantage of this invention is that it provides a hydraulic expansion coupling hub. By setting an annular adjusting ring as a piston to compress the hydraulic oil as a whole, and cooperating with a small number of symmetrically distributed adjusting screws to drive the adjusting ring to move axially, the purpose of pressurizing the hydraulic chamber can be achieved by driving only a small number of screws, which significantly simplifies the operation process and improves the adjustment efficiency.

[0005] Another advantage of this invention is that it provides a hydraulic expansion coupling hub. Since the adjusting ring moves axially as an integral component to compress the hydraulic oil, it avoids the problem of uneven pressure distribution caused by the independent force application of traditional multi-screw couplings, making the pressure distribution in the hydraulic chamber more uniform and the force on the inner bushing more consistent, thereby improving the reliability of the expansion connection and the stability of the shaft transmission.

[0006] Another advantage of this invention is that it provides a hydraulic expansion coupling hub, which, by setting a ball valve-type sealing structure including a sealing ball, a conical groove and a sealing ring at the oil inlet, realizes convenient opening and closing control of the oil inlet channel and double sealing protection, effectively preventing leakage of high-pressure hydraulic oil and improving the sealing reliability and service life of the hydraulic system.

[0007] According to one aspect of the present invention, a hydraulically tightening coupling hub is provided, comprising: A hub body includes a hub disc and a hub segment. The hub segment includes an inner bushing and an outer bushing. A shaft hole is formed on the inner side of the inner bushing. The outer bushing is fitted onto the outer side of the inner bushing. An annular hydraulic cavity and an annular receiving cavity are formed between the outer cavity surface of the inner bushing and the inner cavity surface of the outer bushing. The annular hydraulic cavity and the annular receiving cavity are interconnected. The annular hydraulic cavity is filled with hydraulic oil. An adjustment hole communicating with the receiving cavity is provided on the end face of the hub segment. An adjusting assembly includes an adjusting ring and an adjusting screw. The adjusting ring is slidably disposed within the receiving cavity, and the axial length of the receiving cavity is greater than the axial length of the adjusting ring. The adjusting screw is installed in the adjusting hole, and one end of the adjusting screw is adapted to abut against the end face of the adjusting ring to adjust the oil pressure of the hydraulic oil in the annular hydraulic cavity, thereby causing the inner bushing to tightly grip the shaft disposed in the shaft hole.

[0008] In one embodiment, the adjusting ring has an annular groove on its circumferential surface, and a sealing ring is installed in the annular groove. The sealing ring forms a seal with the outer cavity surface of the inner bushing and the inner cavity surface of the outer bushing.

[0009] In one embodiment, the outer bushing has an oil inlet on the side away from the shaft disc that communicates with the hydraulic chamber, and the hydraulic expansion coupling hub also includes a sealing element disposed at the oil inlet.

[0010] In one embodiment, the sealing element includes a rod body, the rod body including a sealing end, a protrusion and an operating end, the sealing end extending into the oil inlet, and the sealing element further includes a sealing ring, the sealing ring being sleeved on the sealing end and abutting against the protrusion.

[0011] In one embodiment, the sealing end has an internal channel communicating with the hydraulic chamber, and an elastic sealing ball is provided at the entrance of the internal channel. The operating end has an internal hole, and a bolt component is movably disposed in the internal hole. When the bolt component is tightened, it presses against the sealing ball to block the internal channel.

[0012] In one embodiment, the sealing end is provided with a tapered groove located at the entrance of the inner channel to accommodate the sealing ball.

[0013] In one embodiment, at least two adjusting screws are arranged symmetrically along the circumferential direction of the shaft joint.

[0014] In one embodiment, one end of the adjusting screw is provided with an adjusting screw hole.

[0015] In one embodiment, the two sealing elements are respectively symmetrically arranged on opposite sides of the shaft joint.

[0016] In one embodiment, the shaft disc extends integrally to the outside of the outer bushing and is configured as a toothed disc for connecting a serpentine spring. Attached Figure Description

[0017] Figure 1 This is a perspective view of the hub of a hydraulic expansion coupling according to a preferred embodiment of the present invention.

[0018] Figure 2 This is another perspective view of the hub of the hydraulic expansion coupling according to the above-described preferred embodiment of the present invention.

[0019] Figure 3 This is another perspective view of the hub of the hydraulic expansion coupling according to the above-described preferred embodiment of the present invention.

[0020] Figure 4 This is an exploded view of the hub of the hydraulic expansion coupling according to the above-described preferred embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional schematic diagram of the hub of the hydraulic expansion coupling according to the above-described preferred embodiment of the present invention.

[0022] Figure 6 This is an enlarged perspective view of the sealing element of the hydraulic expansion coupling hub according to the above-described preferred embodiment of the present invention.

[0023] Figure 7 This is an exploded schematic diagram of the sealing element of the hydraulic expansion coupling hub according to the above-described preferred embodiment of the present invention.

[0024] Figure 8 This is an enlarged cross-sectional schematic diagram of the sealing element of the hydraulic expansion coupling hub according to the above-described preferred embodiment of the present invention.

[0025] Figure 9 This is a perspective view of a hydraulic expansion coupling hub according to a modified embodiment of the above-described preferred embodiment of the present invention.

[0026] Figure 10 This is another perspective view of the hub of the hydraulic expansion coupling according to the above-described modified embodiment of the preferred embodiment of the present invention.

[0027] Figure 11 This is an exploded view of the hub of the hydraulic expansion coupling according to the above-described modified embodiment of the preferred embodiment of the present invention.

[0028] Reference numerals: Hub body 10; Shaft joint 11; Shaft disc 12; Shaft hole 13; Keyway 14; Inner bushing 111; Outer bushing 112; Hydraulic chamber 113; Hydraulic oil 114; Oil inlet 115; Receiving cavity 116; Adjusting hole 117; Clearance 118; Outer cavity surface 1111; Inner cavity surface 1121; Sealing element 20; Rod body 21; Sealing end 211; Operating end 212; Inner hole 2121; Protrusion 213; Bolt component 22; Bolt groove 221; Sealing ring 23; Sealing ball 24; Conical groove 25; Adjusting assembly 30; Adjusting screw 31; Adjusting screw hole 311; Adjusting ring 32; Annular groove 321; Sealing ring 33. Detailed Implementation

[0029] The terms and words used in the following description are not limited to their literal meanings, but are used solely by the inventors to enable a clear and consistent understanding of the invention. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the invention is provided for illustrative purposes only and not for limiting the invention as defined by the appended claims and their equivalents.

[0030] While ordinal numbers such as "first," "second," etc., will be used to describe various components, there is no limitation on which components are used herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms "comprising" and / or "having" as used in this specification specify the presence of the described features, numbers, steps, operations, components, elements, or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.

[0032] like Figures 1 to 8 As shown, according to one embodiment of the present invention, a hydraulically tightening coupling hub is provided, which includes a hub body 10, a sealing element 20 and an adjusting assembly 30. The coupling includes two hub bodies 10 and a transmission assembly such as a serpentine spring disposed between the two hub bodies 10. In the following description, the transmission assembly is illustrated by way of a serpentine spring.

[0033] In this invention, each of the hub bodies 10 is used to achieve a fixed connection with the corresponding shaft through hydraulic tightening, and after installation, it cooperates with the serpentine spring, thereby enabling the coupling to absorb angular deviations, radial deviations, or axial micro-displacements generated during shaft operation while ensuring reliable torque transmission. Therefore, the serpentine spring coupling can effectively reduce impact loads under heavy load or high-speed conditions, improving the stability and service life of the entire transmission system.

[0034] In this embodiment, the hub body 10, together with the sealing element 20 and the adjusting assembly 30, forms an integrated hydraulic tightening structure. The sealing element 20 seals the hydraulic cavity inside the hub body 10, effectively preventing hydraulic oil leakage after injection or pressurization, and ensuring that the hydraulic tightening structure maintains a stable internal pressure state over a long period. The adjusting assembly 30 regulates the pressure of the hydraulic oil in the hydraulic cavity, allowing the hub body 10 to flexibly adjust its clamping force on the shaft according to actual working conditions during installation or maintenance.

[0035] By respectively assembling the sealing element 20 and the adjusting component 30 on the shaft hub body 10, the two shaft hub bodies 10 of the coupling are structurally independent but functionally complementary. On the one hand, each shaft hub body 10 can independently complete the hydraulic tightening connection with the corresponding shaft, avoiding the impact of installation errors on one side on the assembly accuracy of the other side; on the other hand, under the transmission action of the serpentine spring, the two shaft hub bodies 10 can still achieve efficient and stable power transmission as a whole.

[0036] Most importantly, since the hub body 10 is connected to the shaft via hydraulic expansion, compared to traditional keyed or interference-fit connections, this invention effectively avoids localized damage to the shaft surface caused by stress concentration, while improving the coaxiality and repeated assembly / disassembly performance between the hub and shaft. Combined with the elastic characteristics of the serpentine spring transmission assembly, the coupling maintains good transmission performance and reliability even under conditions of high torque or frequent start-stop cycles.

[0037] The hub body 10 is used to connect to the shaft body by hydraulic expansion. It includes a shaft joint 11 and a shaft disc 12. The shaft disc 12 can be implemented as a gear disc with multiple spaced teeth for connection with a serpentine spring. The shaft joint 11 includes an inner bushing 111 and an outer bushing 112 disposed outside the inner bushing 111. An annular hydraulic cavity 113 is formed between the inner bushing 111 and the outer bushing 112. The hydraulic cavity 113 is filled with hydraulic oil 114, which can be a medium with a certain fluidity, such as grease, lubricating oil, or synthetic oil.

[0038] In this invention, the hub body 10 is used to reliably connect to the shaft via hydraulic expansion, ensuring stable torque transmission even under axial and radial loads. The hub body 10's disc 12 has multiple spaced teeth arranged circumferentially for meshing with the serpentine spring transmission assembly, achieving flexible torque transmission and power coupling. Through the meshing of the disc 12 with the serpentine spring, the coupling can absorb angular misalignment, radial misalignment, and minor axial displacement generated during shaft operation, thereby improving the coupling's stability and service life under heavy loads or high-speed conditions.

[0039] The inner bushing 111 and the outer bushing 112 of the shaft joint 11 are coaxially fitted to form an annular gap, namely an annular hydraulic cavity 113. The hydraulic cavity 113 is filled with hydraulic oil 114. During the hydraulic tightening process, when the pressure of the hydraulic oil 114 is increased, the inner wall of the hydraulic cavity 113 expands uniformly, causing the inner bushing 111 to contract radially inward, thereby tightly holding the shaft body and realizing a firm fixation between the hub body 10 and the shaft body.

[0040] Through the hydraulic cavity 113 formed between the inner bushing 111 and the outer bushing 112, the hub body 10 can achieve uniform circumferential expansion and uniform radial contraction during the stress process, avoiding the problem of shaft surface damage caused by local stress concentration in traditional bolt-type tightening or interference fit connections. At the same time, the pressure of the hydraulic oil 114 can be adjusted according to the actual working conditions, thereby flexibly controlling the clamping force.

[0041] The inner bushing 111 has a shaft hole 13 formed on its inner side for mounting the shaft body, and the shaft disc 12 extends integrally to the outer side of the outer bushing 112. The shaft hole 13 of the inner bushing 111 allows the shaft body to be accurately positioned axially within the hub body 10. Through the engagement of the shaft hole 13 and the shaft body, the inner bushing 111 can uniformly contract radially inward during hydraulic tightening, thereby achieving a tight grip on the shaft body and ensuring a reliable connection between the hub body 10 and the shaft body. The shaft disc 12 extends integrally to the outer side of the outer bushing 112, allowing the shaft disc 12 to directly mesh with the serpentine spring drive assembly, achieving flexible torque transmission and maintaining stable power transmission performance of the coupling when subjected to axial, radial, and angular micro-displacements.

[0042] The inner bushing 111 and the outer bushing 112 have oil inlets 115 on the side away from the shaft disc 12. The oil inlets 115 are used to inject hydraulic oil into the hydraulic chamber 113 inside the shaft hub. A sealing element 20 is positioned at the oil inlet 115 to seal the hydraulic chamber 113, preventing hydraulic oil leakage during pressurization or use, thereby ensuring the long-term stable operation of the hydraulic tightening system. Through the effective sealing of the sealing element 20, the shaft hub body 10 can maintain a high-pressure state within the hydraulic chamber, achieving a continuous clamping force on the shaft and ensuring high reliability and safety of the entire serpentine spring coupling during operation.

[0043] like Figure 5 As shown, an annular receiving cavity 116 and an adjusting hole 117 communicating with the receiving cavity 116 are also formed between the inner bushing 111 and the outer bushing 112. The adjusting assembly 30 includes an adjusting screw 31 and an adjusting ring 32. The adjusting ring 32 is movably disposed in the receiving cavity 116 and is adapted to move along the axial direction of the shaft joint 11. When the shaft is placed in the shaft hole 13, the adjusting screw 31 is driven, such as by rotating a corresponding tool, to move towards the adjusting ring 32, thereby driving the adjusting ring 32 to pressurize the hydraulic oil 114 in the hydraulic cavity 113, adjusting the oil pressure in the hydraulic cavity 113, and further driving the inner bushing 111 to grip the shaft in the shaft hole 13.

[0044] The adjusting ring 32 can evenly distribute the local force applied by the adjusting screw 31 circumferentially throughout the entire hydraulic chamber 113, avoiding the problem of uneven expansion of the inner bushing caused by local pressure from multiple screws in the conventional technology. In this invention, by providing an annular adjusting ring 32, the number of adjusting screws 31 can be reduced. For example, in this embodiment, two symmetrical adjusting screws 31 can be set in two corresponding adjusting holes 117 and driven by corresponding tools to adjust the position of the entire adjusting ring 32, thereby adjusting the oil pressure of the hydraulic oil 114 in the hydraulic chamber 113 located between the sealing element 20 and the adjusting ring 32. In the prior art, a large number of adjusting screws 31 are required along the circumferential direction to adjust the oil pressure of the hydraulic oil 114 in the hydraulic chamber 113.

[0045] The adjusting ring 32 may be made of a hard material, such as steel, aluminum alloy or other metal materials with sufficient strength and rigidity, to ensure that the force applied by the adjusting screw 31 can be accurately transmitted during the adjustment process, to ensure that the pressure of the hydraulic oil 114 in the hydraulic chamber 113 is evenly distributed, and to maintain shape stability under high load or long-term use conditions.

[0046] In addition, the adjusting ring 32 can also be made of an elastic material, such as polyurethane, nylon, engineering plastics, or other materials with a certain degree of elasticity and deformability. The adjusting ring 32 made of an elastic material can deform slightly when pressure is applied, thereby further improving the pressure uniformity in the hydraulic chamber 113, and can play a buffering role when subjected to sudden loads or vibrations, reducing the impact of local stress concentration on the inner bushing 111 and the shaft.

[0047] By selecting the above materials, the present invention can flexibly design the adjustment ring 32 according to different working conditions. It can achieve rigid force transmission to ensure high-precision adjustment, and can also use elastic deformation to provide additional buffering and stress dispersion functions, thereby improving the uniformity of hydraulic expansion of the hub body 10, operational reliability and service life.

[0048] The adjusting screw 31 has an adjusting screw hole 311 at one end, and an adjusting tool (such as a screw wrench or an Allen wrench) is correspondingly provided with threads. By inserting it into the adjusting screw hole 311, the position of the adjusting screw 31 is adjusted accordingly. The other end of the adjusting screw 31 can abut against the adjusting ring 32 to adjust the position of the adjusting ring 32.

[0049] The inner bushing 111 has an outer cavity surface 1111, and the outer bushing 112 has an inner cavity surface 1121. An annular receiving cavity 116 is formed between the outer cavity surface 1111 of the inner bushing 111 and the inner cavity surface 1121 of the outer bushing 112. Along the axial direction of the shaft joint 11, the length of the receiving cavity 116 is greater than the length of the adjusting ring 32. Thus, there can be a gap 118 in the receiving cavity 116 along the axial direction of the shaft joint 11, which allows the adjusting ring 32 to move axially in the receiving cavity 116.

[0050] In addition, the circumferential surface of the adjusting ring 32 has an annular groove 321, and the adjusting assembly 30 also includes a flexible sealing ring 33, which is disposed in the annular groove 321, thereby achieving a seal between the outer cavity surface 1111 of the inner bushing 111 and the inner cavity surface 1121 of the outer bushing 112 and the circumferential surface of the adjusting ring 32, preventing hydraulic oil 114 from reaching the end of the adjusting ring 32 that abuts against the adjusting screw 32.

[0051] like Figures 6 to 8 As shown, the sealing element 20 includes a rod 21, a bolt component 22, and a flexible sealing ring 23. The rod 21 includes a sealing end 211 and an exposed operating end 212 opposite to the sealing end 211, as well as a protrusion 213 located between the two ends. The flexible sealing ring 23 is fitted onto the sealing end 211 and abuts against the side of the protrusion 213. The operating end 212 has an inner hole 2121 in which the bolt component 22 is movably disposed. The bolt component 22 has a bolt groove 221 for driving the bolt component 22 to move within the inner hole 2121 after a corresponding bolting tool is inserted.

[0052] The sealing element 20 also includes a sealing ball 24, which may be made of an elastic material and is disposed in the inner hole 2121 of the operating end 212 to be abutted by the bolt member 22. The sealing end 211 of the rod body 21 also has an inner channel 211 that communicates with the hydraulic chamber 113, and the sealing ball 24 is used to block the inner channel 211. The sealing element 20 has a tapered groove 25 on the side of the inner channel 211 adjacent to the sealing ball 24, which is suitable for receiving the sealing ball 24.

[0053] In this invention, two sealing elements 20 can be provided, which are respectively positioned at the two oil inlets 115. The two sealing elements 20 can be symmetrically arranged on opposite sides of the shaft joint 11.

[0054] like Figures 9 to 11 As shown, according to a modified embodiment, the shaft hole 13 of the shaft joint 11 of the hub body 10 also has a keyway 14. The depth and width of the keyway 14 can be optimized according to the surface roughness of the shaft and torque transmission requirements. The presence of the keyway 14 increases the contact area and friction coefficient between the inner bushing 111 and the shaft, enabling the transmission of greater torque under the same hydraulic pressure conditions, or reducing the required hydraulic pressure under the same torque demand, thereby improving the transmission efficiency and energy utilization of the coupling.

[0055] The hydraulic chamber 113 inside the hub body 10 can also be provided with a groove section surrounding the keyway 14 to avoid excessive contact pressure between the keyway 14 in the shaft hole 13 and the shaft body, ensure uniform distribution of the medium on the outside of the shaft body, achieve pressure balance inside the hub body 10, more effectively regulate the internal pressure, and further improve the stability and reliability of the connection.

[0056] This invention utilizes the adjusting component 30 to provide axial driving force, enabling the hydraulic expansion coupling hub to move the adjusting ring 32 axially within the receiving cavity 116, thereby compressing the hydraulic oil 114 within the hydraulic chamber 113. The increased pressure of the hydraulic oil 114 then drives the inner bushing 111 to expand uniformly, gripping the shaft within the shaft hole 13. According to this invention, the hydraulic expansion coupling hub uses the annular adjusting ring 32 as a piston to compress the hydraulic oil 114 as a whole, and the pressure of the hydraulic chamber 113 can be independently controlled by a small number of adjusting screws 31. The adjusting ring 32 moves axially as a single component, reducing reliance on the coordinated operation of multiple screws in the circumferential direction. Therefore, during installation or disassembly operations, operational convenience and the uniformity of force distribution on the inner bushing 111 are improved.

[0057] More specifically, during installation, the shaft hole 13 of the hub body 10 is fitted onto the shaft. Hydraulic oil 114 is injected into the hydraulic chamber 113 through the oil inlet 115, and the inner channel 2111 is sealed using the sealing ball 24 and bolt component 22. Next, a tightening tool is inserted into the corresponding adjusting screw holes 311 of the two symmetrically arranged adjusting screws 31, driving the adjusting screws 31 to rotate synchronously and move towards the adjusting ring 32 in the corresponding adjusting screw holes 311. The adjusting screws 31 move axially through the threaded engagement, pushing the adjusting ring 32 and compressing the hydraulic oil 114. As the pressure of the hydraulic oil 114 increases, the inner bushing 111 expands uniformly and clamps the shaft, completing the connection. During disassembly, the adjusting screws 31 are rotated in the opposite direction, causing the adjusting ring 32 to move away from the hydraulic chamber 113, the pressure of the hydraulic oil 114 decreases, the inner bushing 111 returns to its original shape, and the hub body 10 can be removed from the shaft.

[0058] It should also be noted that in the apparatus, device, and method of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of the present invention.

[0059] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0060] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A hydraulically tightening coupling hub, characterized in that... ,include: A hub body includes a hub disc and a hub segment. The hub segment includes an inner bushing and an outer bushing. A shaft hole is formed on the inner side of the inner bushing. The outer bushing is fitted onto the outer side of the inner bushing. An annular hydraulic cavity and an annular receiving cavity are formed between the outer cavity surface of the inner bushing and the inner cavity surface of the outer bushing. The annular hydraulic cavity and the annular receiving cavity are interconnected. The annular hydraulic cavity is filled with hydraulic oil. An adjustment hole communicating with the receiving cavity is provided on the end face of the hub segment. An adjusting assembly includes an adjusting ring and an adjusting screw. The adjusting ring is slidably disposed within the receiving cavity, and the axial length of the receiving cavity is greater than the axial length of the adjusting ring. The adjusting screw is installed in the adjusting hole, and one end of the adjusting screw is adapted to abut against the end face of the adjusting ring to adjust the oil pressure of the hydraulic oil in the annular hydraulic cavity, thereby causing the inner bushing to tightly grip the shaft disposed in the shaft hole.

2. The hydraulic expansion coupling hub according to claim 1, characterized in that... The adjusting ring has an annular groove on its circumference, and a sealing ring is installed in the annular groove. The sealing ring forms a seal with the outer cavity surface of the inner bushing and the inner cavity surface of the outer bushing.

3. The hydraulic expansion coupling hub according to claim 1, characterized in that... The outer bushing has an oil inlet on the side away from the shaft disc that communicates with the hydraulic chamber. The hydraulic expansion coupling hub also includes a sealing element, which is located at the oil inlet.

4. The hydraulic expansion coupling hub according to claim 3, characterized in that... The sealing element includes a rod body, which includes a sealing end, a protrusion, and an operating end. The sealing end extends into the oil inlet. The sealing element also includes a sealing ring, which is sleeved on the sealing end and abuts against the protrusion.

5. The hydraulic expansion coupling hub according to claim 4, characterized in that... The sealing end has an internal channel communicating with the hydraulic chamber. An elastic sealing ball is provided at the entrance of the internal channel. The operating end has an internal hole. A bolt component is movably disposed in the internal hole. When the bolt component is tightened, it presses against the sealing ball to block the internal channel.

6. The hydraulic expansion coupling hub according to claim 5, characterized in that... The sealing end is provided with a tapered groove, which is located at the entrance of the inner channel to accommodate the sealing ball.

7. The hydraulic expansion coupling hub according to any one of claims 1 to 6, characterized in that... At least two adjusting screws are arranged symmetrically along the circumference of the shaft joint.

8. The hydraulically tightening coupling hub according to any one of claims 1 to 6, characterized in that... One end of the adjusting screw is provided with an adjusting screw hole.

9. The hydraulically tightening coupling hub according to any one of claims 1 to 6, characterized in that... The two sealing elements are symmetrically arranged on opposite sides of the shaft joint.

10. The hydraulic expansion coupling hub according to any one of claims 1 to 6, characterized in that... The shaft disk extends integrally to the outside of the outer bushing and is constructed as a toothed disk for connecting the serpentine spring.

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