A welding-free hydraulic coupling hub and hydraulic coupling

Abstract

This invention discloses a weldless hydraulic coupling hub and a hydraulic coupling. The weldless hydraulic coupling hub includes: a hub body having a receiving hole extending axially along the hub body, the wall of the receiving hole forming the inner peripheral wall of the body; an adjusting member including an adjusting section extending into the receiving hole and radially opposite to the inner peripheral wall of the hub body, a hydraulic cavity being formed between the adjusting section and the inner peripheral wall of the body; a shaft hole defining a shaft hole for receiving a shaft body, wherein the adjusting section clamps the shaft body by injecting or releasing hydraulic oil into the hydraulic cavity to adjust the diameter of the shaft hole; a sealing assembly disposed between the hub body and the adjusting member for sealing the hydraulic cavity; and a connecting assembly for detachably mechanically connecting the hub body and the adjusting member, thereby clamping the sealing assembly between the hub body and the adjusting member.

Description

Technical Field

[0001] This invention relates to the field of shaft connection devices, and in particular to a weld-free hydraulic coupling hub and a hydraulic coupling. Background Technology

[0002] As a core component in shaft systems for transmitting torque, couplings typically use a hydraulic expansion connection between the hub and the shaft. This involves injecting high-pressure oil into a sealed oil reservoir inside the hub, causing the hub walls to expand elastically and evenly grip the shaft, creating the required interference fit. Hydraulic expansion couplings offer advantages such as easy assembly and disassembly, no damage to the shaft, and high torque transmission capacity, and are therefore widely used.

[0003] In related technologies, hydraulic expansion couplings typically construct the oil reservoir using a "machined annular groove + welded end cap" method. This involves machining a circumferential groove on the inner wall of the hub, then inserting an inner sleeve or sealing plate and welding it to form a sealed cavity. However, the welding process introduces a series of problems, such as: welding heat input causing hub wall deformation and uneven expansion, leading to an imbalance in clamping force; stress concentration at the weld toe, which can easily cause fatigue cracks during repeated pressure injection and depressurization, even resulting in instantaneous pressure loss; and defects such as porosity and lack of fusion in the weld, which gradually form leakage channels under long-term high-pressure oil pressure, requiring frequent pressure replenishment and resulting in high maintenance costs. Furthermore, the welding process itself is characterized by a long flow and numerous quality control points; failure at any stage leads to the scrapping of the entire component, and the reduced strength of the heat-affected zone limits the application of high-strength steel and stainless steel, making it difficult to guarantee the reliability of hydraulic expansion couplings. Summary of the Invention

[0004] One object of the present invention is to provide a weldless hydraulic coupling hub that can form a hydraulic cavity for accommodating hydraulic oil without welding, thereby reducing the difficulty of forming the hydraulic cavity and reducing the risk of hydraulic oil leakage.

[0005] Another object of the present invention is to provide a hydraulic coupling having the above-described weldless hydraulic coupling hub.

[0006] To achieve at least one of the above objectives, the technical solution adopted by the present invention is as follows: a weldless hydraulic coupling hub, comprising: a hub body having a receiving hole extending axially along the hub body, the wall of the receiving hole forming the inner peripheral wall of the body; an adjusting member including an adjusting section extending into the receiving hole and radially opposite to the inner peripheral wall of the body, a hydraulic cavity being formed between the adjusting section and the inner peripheral wall of the body; the adjusting member defining a shaft hole for receiving a shaft body, wherein the adjusting section clamps the shaft body by injecting or releasing hydraulic oil into the hydraulic cavity; a sealing assembly disposed between the hub body and the adjusting member for sealing the hydraulic cavity; and a connecting assembly for detachably mechanically connecting the hub body and the adjusting member, thereby clamping the sealing assembly between the hub body and the adjusting member.

[0007] As a preferred embodiment, the sealing assembly includes an annular first seal and a second seal, which are spaced apart along the axial direction of the hub body. A hydraulic cavity is formed between the first seal and the second seal, and the adjusting section undergoes radial elastic deformation under the pressure of hydraulic oil in the hydraulic cavity to grip the shaft.

[0008] As a preferred embodiment, the outer peripheral wall of the adjusting section is provided with a first reservoir for accommodating hydraulic oil. Along the axial direction of the hub body, the size of the first reservoir is smaller than the size of the adjusting section, and the first reservoir is located between the first seal and the second seal; and / or the inner peripheral wall of the hub body is provided with a second reservoir for accommodating hydraulic oil. Along the axial direction of the hub body, the size of the second reservoir is smaller than the size of the adjusting section. The second reservoir and the adjusting section are arranged radially opposite to each other along the hub body, and the second reservoir is located between the first seal and the second seal.

[0009] As a preferred embodiment, the adjusting member further includes a fixing section integrally formed with the adjusting section, the outer diameter of the fixing section being larger than the outer diameter of the adjusting section, and the fixing section being disposed opposite to the end face of the hub body along the axial direction of the hub body; the first sealing member is clamped between the end face of the hub body and the fixing section of the adjusting member along the axial direction of the hub body; the second sealing member is clamped between the inner peripheral wall of the hub body and the adjusting section of the adjusting member along the radial direction of the hub body.

[0010] As a preferred embodiment, the connecting assembly includes a first connecting assembly and a second connecting assembly. The first connecting assembly is used to connect the fixed section of the adjusting member and the hub body, and the first connecting assembly is located on the side of the first seal away from the hydraulic cavity. The second connecting assembly is used to connect the adjusting section of the adjusting member and the hub body, and the second connecting assembly is located on the side of the second seal away from the hydraulic cavity.

[0011] As a preferred embodiment, the hub body includes a first end face and a second end face disposed opposite to each other along the axial direction of the hub body; the second connecting assembly includes a stop member and a plurality of second fasteners, the stop member including an integrally formed mounting section and a stop section, the outer diameter of the mounting section being larger than the outer diameter of the stop section, the mounting section being disposed opposite to one of the first end face or the second end face along the axial direction of the hub body; the stop section extending into the receiving hole along the radial direction of the hub body, a portion of the adjusting section being located between the stop section and the inner peripheral wall of the body along the radial direction of the hub body; the plurality of second fasteners are used to connect the mounting section and the hub body; the fixing section of the adjusting member being disposed opposite to the other of the first end face or the second end face along the axial direction of the hub body.

[0012] As a preferred embodiment, the stop further includes an extension section connected to the outer edge of the mounting section. The extension section extends axially along the outer periphery of the hub body and radially along the hub body. A portion of the hub body and a portion of the adjusting section are located between the extension section and the stop section.

[0013] As a preferred embodiment, the hub body has an oil passage that communicates with the hydraulic chamber for injecting and releasing hydraulic oil into and from the hydraulic chamber; the weldless hydraulic coupling hub also includes a sealing element that is installed on the hub body to seal the oil passage.

[0014] As a preferred embodiment, the oil passage is staggered from the first connecting component of the connecting assembly along the circumferential direction of the hub body.

[0015] To achieve at least one of the above objectives, the technical solution adopted by the present invention is: a hydraulic coupling, including the weldless hydraulic coupling hub as described above.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: A hydraulic cavity is formed between the hub body and the adjusting component. The hydraulic cavity is sealed by a sealing assembly. The hub body and the adjusting component are connected by a connecting assembly, which helps to ensure that the sealing assembly is reliably clamped between the hub body and the adjusting component. Thus, the hydraulic cavity can be formed without welding, which reduces the difficulty of forming the hydraulic cavity and reduces the risk of hydraulic oil leakage. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a weldless hydraulic coupling hub according to a first preferred embodiment of this application.

[0018] Figure 2 This is an exploded view of the weldless hydraulic coupling hub according to the first preferred embodiment of this application.

[0019] Figure 3 This is a cross-sectional view of the hub of the weldless hydraulic coupling according to the first preferred embodiment of this application along the direction of the connecting assembly.

[0020] Figure 4 This is a cross-sectional view of the hub of the weldless hydraulic coupling according to the first preferred embodiment of this application along the oil passage direction.

[0021] Figure 5 This is a schematic diagram of a weldless hydraulic coupling hub according to a second preferred embodiment of this application.

[0022] Figure 6 This is an exploded view of the weldless hydraulic coupling hub according to a second preferred embodiment of this application.

[0023] Figure 7 This is a cross-sectional view of the hub of the weldless hydraulic coupling according to the second preferred embodiment of this application along the direction of the connecting assembly.

[0024] Figure 8 This is a cross-sectional view of the hub of the weldless hydraulic coupling according to the second preferred embodiment of this application along the oil passage direction.

[0025] Figure 9 This is a schematic diagram of a weldless hydraulic coupling hub according to a third preferred embodiment of this application.

[0026] Figure 10 This is an exploded view of the weldless hydraulic coupling hub according to the third preferred embodiment of this application.

[0027] Figure 11 This is a cross-sectional view of the hub of the weldless hydraulic coupling according to the third preferred embodiment of this application along the direction of the connecting assembly.

[0028] Figure 12This is a cross-sectional view of the hub of the weldless hydraulic coupling according to the third preferred embodiment of this application along the oil passage direction.

[0029] Figure 13 This is a schematic diagram of a weldless hydraulic coupling hub according to the fourth preferred embodiment of this application.

[0030] Figure 14 This is an exploded view of the weldless hydraulic coupling hub according to the fourth preferred embodiment of this application.

[0031] Figure 15 This is a cross-sectional view of the hub of the weldless hydraulic coupling according to the fourth preferred embodiment of this application along the direction of the connecting assembly.

[0032] Figure 16 This is a cross-sectional view of the hub of the weldless hydraulic coupling according to the fourth preferred embodiment of this application along the oil passage direction.

[0033] In the figure: 10, hub body; 11, receiving hole; 111, inner peripheral wall of the body; 12, shaft disc; 121, first end face; 122, retaining tooth; 13, shaft joint; 131, second end face; 132, stepped surface; 14, oil passage; 20, adjusting component; 21, fixed section; 22, adjusting section; 221, shaft hole; 222, first liquid reservoir; 30, hydraulic chamber; 40, sealing assembly; 41, first seal; 42, second seal; 50, connecting assembly; 51, first connecting assembly; 511, first fastener; 52, second connecting assembly; 521, second fastener; 522, stop; 5221, mounting section; 5222, stop section; 5223, extension section; 60, sealing component. Detailed Implementation

[0034] The present invention will now be further described in conjunction with specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0035] In the description of this invention, it should be noted that directional terms such as "center," "lateral," "longitudinal," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0036] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0037] A weld-free hydraulic coupling hub, such as Figures 1-16 As shown, the assembly includes: a hub body 10, an adjusting member 20, a sealing assembly 40, and a connecting assembly 50. Specifically, the hub body 10 has a receiving hole 11 extending axially along the hub body 10, and the wall surface of the receiving hole 11 forms an inner peripheral wall 111 of the body. The adjusting member 20 includes an integrally formed fixed section 21 and an adjusting section 22. The outer diameter of the fixed section 21 is larger than the outer diameter of the adjusting section 22. The fixed section 21 and the end face of the hub body 10 are arranged opposite each other axially along the hub body 10. The adjusting section 22 extends into the receiving hole 11 and is arranged radially opposite to the inner peripheral wall 111 of the body. A hydraulic cavity 30 is formed between the adjusting section 22 and the inner peripheral wall 111 of the body. The adjusting member 20 defines a shaft hole 221 for receiving a shaft. By injecting hydraulic oil into or releasing hydraulic oil from the hydraulic cavity 30, the adjusting section 22 clamps the shaft. A sealing assembly 40 is disposed between the hub body 10 and the adjusting member 20 to seal the hydraulic chamber 30. A connecting assembly 50 is used to detachably mechanically connect the hub body 10 and the adjusting member 20, and to clamp the sealing assembly 40 between the hub body 10 and the adjusting member 20.

[0038] In other words, such as Figure 3 , Figure 7 , Figure 11 and Figure 15 As shown, a hydraulic cavity 30 is formed between the hub body 10 and the adjusting member 20. The hydraulic cavity 30 is sealed by a sealing assembly 40, and the hub body 10 and the adjusting member 20 are connected by a connecting assembly 50, which helps to ensure that the sealing assembly 40 is reliably clamped between the hub body 10 and the adjusting member 20. It should be understood that this configuration eliminates the need for welding to form the hydraulic cavity 30, thus reducing the difficulty of forming the hydraulic cavity 30. Furthermore, it helps to avoid defects such as deformation, stress concentration, and porosity in the hub body 10 and the adjusting member 20 caused by welding, thereby reducing the risk of hydraulic oil leakage and improving the reliability of the hydraulic coupling. In other words, this embodiment can achieve uniform radial deformation of the adjusting section 22 by direct hydraulic drive through a purely mechanical assembly and a fully detachable structure, so that the weldless hydraulic coupling hub has both a minimalist structure and high reliability.

[0039] Furthermore, since the hub body 10 and the adjusting component 20 are independent, the optimal materials can be selected according to their functional requirements. For example, the hub body 10 can be made of high-strength alloy steel to withstand large torques, while the adjusting component 20 can be made of special steel with moderate elastic modulus and excellent fatigue performance to ensure deformation performance, without being limited by the weldability of the material as in welded structures.

[0040] It is worth mentioning that the connecting component 50 detachably mechanically connects the hub body 10 and the adjusting component 20. If the sealing component 40 fails due to prolonged operation and a leakage channel is formed, the hub body 10 and the adjusting component 20 can be disassembled, the sealing component 40 can be replaced, and then reassembled. In other words, the hub body 10 and the adjusting component 20 can be reused multiple times, which helps to reduce the maintenance cost of the weldless hydraulic coupling hub.

[0041] In addition, the pressure of the hydraulic oil acts directly on the adjusting section 22, driving the adjusting section 22 to adjust the radial clamping force on the shaft, which helps to avoid multi-stage matching, making the utilization efficiency of hydraulic energy higher, and making the response of the weldless hydraulic coupling hub faster and the structure simpler.

[0042] In some embodiments, such as Figure 3 and Figure 4 As shown, the sealing assembly 40 includes an annular first seal 41 and a second seal 42. The first seal 41 and the second seal 42 are spaced apart along the axial direction of the hub body 10, forming a hydraulic cavity 30 between them. The adjusting section 22 undergoes radial elastic deformation under the pressure of hydraulic oil in the hydraulic cavity 30 to grip the shaft. In other words, the hydraulic cavity 30 is formed between the inner peripheral wall 111 of the main body, the first seal 41, the outer peripheral wall of the adjusting member 20, and the second seal 42, which effectively prevents hydraulic oil leakage.

[0043] It is understandable that sealing the hydraulic chamber 30 through welding can easily lead to leakage channels due to welding defects. In this embodiment, the first seal 41 and the second seal 42 are suitable for using standardized extrusion seals or lip seals, such as O-rings, Y-rings, and U-rings. Furthermore, the materials of the first seal 41 and the second seal 42 can be appropriately selected according to the type of hydraulic oil injected, such as mineral oil, water glycol, or phosphate ester, for example, fluororubber, nitrile rubber, or hydrogenated nitrile rubber, thereby achieving a stable and reliable seal, reducing the risk of hydraulic oil leakage, and enabling the weldless hydraulic coupling hub to have broader media compatibility.

[0044] In addition, the first seal 41 and the second seal 42 can also be made of solid metal; the first seal 41 and the second seal 42 can also be hollow and filled with inert gas.

[0045] In at least one embodiment, the first seal 41 and the second seal 42 are implemented as C-shaped metal seals with the opening of the C-shaped metal seal facing the direction of the hydraulic oil. When the hydraulic oil enters the opening of the C-shaped metal seal, the pressure opens the C-shaped metal seal to achieve a reactive seal.

[0046] Furthermore, welding seals in related technologies require sufficient weld space around the hydraulic cavity 30 and need to avoid sharp corners or thin-walled structures to improve the sealing performance and reliability of the weld. In this embodiment, however, only an annular groove structure needs to be formed on the outside of the hub body 10 and / or the adjusting member 20 to accommodate the first seal 41 and the second seal 42. This arrangement allows for a more compact geometry of the hydraulic cavity 30, improving the integration of the weldless hydraulic coupling hub.

[0047] It is worth mentioning that the number of the first seal 41 and the second seal 42 can be one, in order to reduce the number of parts of the weldless hydraulic coupling hub and reduce the assembly difficulty; the number of the first seal 41 and the second seal 42 can also be multiple, in order to further improve the sealing reliability, and this application does not impose specific restrictions on this.

[0048] In some embodiments, such as Figure 2 , Figure 6 , Figure 10 and Figure 14 As shown, a first reservoir 222 for accommodating hydraulic oil is provided on the outer peripheral wall of the adjusting section 22. Along the axial direction of the hub body 10, the size of the first reservoir 222 is smaller than the size of the adjusting section 22. The first reservoir 222 is located between the first seal 41 and the second seal 42. Specifically, the first seal 41, the first reservoir 222 and the second seal 42 are spaced apart. The first reservoir 222 constitutes part of the hydraulic cavity 30. And / or a second reservoir (not shown) for accommodating hydraulic oil is provided on the inner peripheral wall 111 of the main body. Along the axial direction of the hub body 10, the size of the second reservoir is smaller than the size of the adjusting section 22. The second reservoir and the adjusting section 22 are arranged opposite each other along the radial direction of the hub body 10. The second reservoir is located between the first seal 41 and the second seal 42. Specifically, the first seal 41, the second reservoir and the second seal 42 are spaced apart. The second reservoir constitutes part of the hydraulic cavity 30.

[0049] It is understandable that when hydraulic oil is injected into the hydraulic chamber 30 to deform the adjusting member 20 and reduce the diameter of the shaft hole 221, the provision of the first reservoir 222 and / or the second reservoir provides additional buffering and accommodating space. This helps to prevent excessive local deformation or stress concentration of the adjusting member 20 due to excessively high instantaneous pressure or uneven flow of the hydraulic oil, thereby improving the uniformity and controllability of the deformation of the adjusting member 20. Furthermore, by providing the first reservoir 222 and / or the second reservoir, the oil pressure fluctuations in the hydraulic chamber 30 can be stabilized, reducing the direct impact of oil pressure fluctuations on the first seal 41 and the second seal 42, thereby extending the service life of the sealing assembly 40.

[0050] It is worth mentioning that hydraulic oil expands and contracts with temperature changes. By setting the first reservoir 222 and / or the second reservoir, additional volume space can be provided to accommodate the volume of hydraulic oil that expands due to temperature rise. This helps to prevent damage to the sealing assembly 40 or the regulating component 20 due to excessive pressure in the hydraulic chamber 30 caused by excessive expansion of the hydraulic oil.

[0051] In some embodiments, combined with Figure 2 and Figure 3 As shown, the adjusting member 20 is also integrally formed with a fixed section 21, including an adjusting section 22. The outer diameter of the fixed section 21 is larger than the outer diameter of the adjusting section 22. The fixed section 21 and the end face of the hub body 10 are arranged opposite each other along the axial direction of the hub body 10. Further, the first sealing member 41 is clamped between the end face of the hub body 10 and the fixed section 21 of the adjusting member 20 along the axial direction of the hub body 10, thereby achieving a seal on one end of the hydraulic cavity 30 using axial clamping force, and is suitable for withstanding the axial thrust generated by the hydraulic oil on the adjusting member 20. The second sealing member 42 is clamped between the inner peripheral wall 111 of the hub body 10 and the adjusting section 22 of the adjusting member 20 along the radial direction of the hub body 10, thereby achieving a seal on the other end of the hydraulic cavity 30 using radial clamping force. Specifically, the second sealing member 42 is close to the end of the adjusting section 22 away from the fixed section 21.

[0052] It should be understood that the second seal 42 is radially sandwiched between the inner peripheral wall 111 of the main body and the adjusting section 22, which helps the adjusting section 22 to maintain good radial following seal when it undergoes radial elastic deformation under the pressure of hydraulic oil; in other words, when the adjusting section 22 undergoes radial elastic deformation, the second seal 42 can always adhere to the inner peripheral wall 111 of the main body and the outer peripheral wall of the adjusting section 22 through its own slight deformation, thereby maintaining sealing contact.

[0053] It is worth mentioning that the first seal 41 is clamped along the axial direction of the hub body 10 between the end face of the hub body 10 and the fixed section 21 of the adjusting member 20, and the second seal 42 is clamped along the radial direction of the hub body 10 between the inner peripheral wall 111 of the body and the adjusting section 22 of the adjusting member 20. This arrangement allows the sealing assembly 40 to withstand axial thrust and adapt to the radial deformation of the adjusting section 22, thereby providing multi-directional sealing for the hydraulic cavity 30 during the operation of the weldless hydraulic coupling hub, further reducing the risk of hydraulic oil leakage. In other words, the orthogonal sealing arrangement helps improve the adaptability and reliability of the weldless hydraulic coupling hub to complex forces and deformations, and also helps extend the service life of the sealing assembly 40. The orthogonal sealing arrangement also absorbs and buffers the impact of dynamic loads on the sealing interface from different directions, preventing seal failure caused by instantaneous load fluctuations, and improving the reliability of the weldless hydraulic coupling hub under harsh working conditions.

[0054] In addition, the adjusting component 20 is a one-piece stepped structure that can be formed in one step through conventional processes such as turning, casting or forging, without the need for additional welding or mechanical connection processes, thereby reducing manufacturing costs and improving production efficiency.

[0055] In some embodiments, combined with Figure 2 and Figure 3 As shown, the connecting assembly 50 includes a first connecting assembly 51 and a second connecting assembly 52. ​​The first connecting assembly 51 connects the fixed section 21 of the adjusting member 20 and the hub body 10, and is located on the side of the first seal 41 away from the hydraulic chamber 30. The second connecting assembly 52 connects the adjusting section 22 of the adjusting member 20 and the hub body 10, and is located on the side of the second seal 42 away from the hydraulic chamber 30. This arrangement helps to avoid the connecting assembly 50 interfering with the flow and pressure distribution of the hydraulic oil in the hydraulic chamber 30; it also helps to prevent the hydraulic oil from directly impacting the connecting assembly 50, thereby reducing the risk of leakage or loosening at the connection; and it helps to prevent the tightening force of the connecting assembly 50 from directly acting on the sealing assembly 40, preventing the sealing assembly 40 from being squeezed, deformed, or damaged due to excessive local stress.

[0056] Furthermore, in combination Figure 2 and Figure 3 As shown, the first connecting component 51 and the second connecting component 52 are located on the outside of the first seal 41 and the second seal 42, respectively. This reduces the corrosive effect of hydraulic oil on the connecting component 50 and helps to prevent fatigue failure of the connecting component 50. In addition, it facilitates the inspection or replacement of the first connecting component 51 and the second connecting component 52 without disassembling the hydraulic chamber 30, thereby improving the convenience of maintaining the shaft hub of the weldless hydraulic coupling.

[0057] It should be understood that the first connecting component 51 and the second connecting component 52 independently connect the fixed section 21 and the adjusting section 22 of the adjusting component 20, which can improve the connection stability and reliability between the adjusting component 20 and the hub body 10, and reduce the impact of the rigid constraint of the connecting component 50 on the adjusting section 22, so that the adjusting section 22 can smoothly generate elastic deformation under the pressure of hydraulic oil; in other words, the constraint effect of the first connecting component 51 and the second connecting component 52 on the radial elastic deformation of the middle part of the adjusting section 22 is small, so that the adjusting section 22 can generate radial contraction more freely and uniformly under the pressure of hydraulic oil, thereby improving the deformation efficiency and uniformity.

[0058] It is worth mentioning that, combined with Figure 2 and Figure 3 As shown, by arranging the first connecting assembly 51 and the first seal 41 adjacent to each other, and arranging the second connecting assembly 52 and the second seal 42 adjacent to each other, the connecting assembly 50 can form effective axial auxiliary clamping and radial auxiliary clamping on the adjacent first seal 41 and second seal 42 while connecting the hub body 10 and the adjusting member 20. This prevents the seal assembly 40 from loosening or shifting during operation due to mechanical vibration, pressure fluctuation or material creep, and helps the seal assembly 40 maintain a reliable sealing state for a long time. In other words, it can improve the installation stability and long-term working reliability of the first seal 41 and the second seal 42.

[0059] In some embodiments, such as Figure 11 , Figure 12 , Figure 15 and Figure 16As shown, the hub body 10 includes a first end face 121 and a second end face 131 disposed opposite to each other along the axial direction of the hub body 10. Further, the second connecting assembly 52 includes a stop member 522 and a plurality of second fasteners 521. Specifically, the stop member 522 includes an integrally formed mounting section 5221 and a stop section 5222. The outer diameter of the mounting section 5221 is larger than the outer diameter of the stop section 5222. The mounting section 5221 is disposed opposite to one of the first end face 121 or the second end face 131 along the axial direction of the hub body 10. The stop section 5222 extends into the receiving hole 11. Along the radial direction of the hub body 10, a portion of the adjusting section 22 is located between the stop section 5222 and the inner peripheral wall 111 of the body, so as to indirectly fix the adjusting section 22 to the hub body 10 through the stop section 5222. A plurality of second fasteners 521 are used to connect the mounting section 5221 and the hub body 10 so that the stop 522 is fixed to the hub body 10. Furthermore, the fixing section 21 of the adjusting member 20 is disposed axially opposite to the other of the first end face 121 or the second end face 131 of the hub body 10. The first connecting assembly 51 includes a plurality of first fasteners 511 for connecting the fixing section 21 and the hub body 10 so that the stop 522 is fixed to the hub body 10.

[0060] It is understandable that the stop section 5222 of the stop member 522 provides a mechanical limit to the adjusting section 22, helping to ensure that the second seal 42 is within the effective compression range, thereby reducing the risk of hydraulic oil leakage and improving the reliability of the hydraulic coupling. Furthermore, the mounting section 5221 of the stop member 522 is fixed to one of the first end face 121 or the second end face 131 of the hub body 10 via the second connecting assembly 52, and the fixing section 21 of the adjusting member 20 is fixed to the other of the first end face 121 or the second end face 131 of the hub body 10 via the second connecting assembly 52. ​​The assembly sequence among the hub body 10, the stop member 522, and the adjusting member 20 is clear, which helps to improve assembly efficiency.

[0061] It is worth mentioning that the hydraulic cavity 30 of the weldless hydraulic coupling hub only involves the hub body 10 and the adjusting member 20. In other words, the stop member 522 does not participate in the formation of the hydraulic cavity 30, and the sealing assembly 40 is only set between the hub body 10 and the adjusting member 20. This further reduces the leakage points of hydraulic oil, reduces the difficulty of sealing the hydraulic cavity 30, thereby improving the reliability of the hydraulic cavity 30 seal and reducing the risk of hydraulic oil leakage.

[0062] In at least one embodiment, such as Figure 11 and Figure 15As shown, the first fastener 511 passes through the fixing section 21 of the adjusting member 20 along the axial direction of the hub body 10 and is screwed into the hub body 10; the second fastener 521 passes through the mounting section 5221 of the stop member 522 along the axial direction of the hub body 10 and is screwed into the hub body 10.

[0063] In at least one embodiment, such as Figure 15 As shown, the stop 522 also includes an extension 5223, which is connected to the outer edge of the mounting section 5221. The extension 5223 extends axially along the outer periphery of the hub body 10 and radially along the hub body 10. A portion of the hub body 10 and a portion of the adjusting section 22 are located between the extension 5223 and the stop 5222.

[0064] It is understandable that the extension section 5223, the mounting section 5221, and the stop section 5222 together form a "U"-shaped structure, which helps to improve the overall bending resistance of the stop member 522, thereby providing a more reliable limiting effect on the adjusting section 22 of the adjusting member 20. Furthermore, the mounting section 5221 and the extension section 5223 wrap around the end of the shaft hub body 10 from the outside, which can play an auxiliary buffering and supporting role when the shaft hub of the weldless hydraulic coupling is subjected to axial impact or vibration, thereby reducing the risk of damage to the shaft hub body 10 and helping to avoid damage such as cracks in the shaft hub body 10 that would affect the sealing performance of the hydraulic chamber 30.

[0065] It is worth mentioning that by setting the extension section 5223, the gap path formed between the stop 522 and the hub body 10 is made more tortuous, thereby accommodating the small amount of hydraulic oil that may overflow from the second seal 42, and preventing external dust, debris and other foreign objects from entering the hydraulic chamber 30; in other words, this setting can play the role of secondary sealing and dust prevention.

[0066] In other embodiments, such as Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, the first connecting assembly 51 includes a plurality of first fasteners 511, and the second connecting assembly 52 includes only a plurality of second fasteners 521. Specifically, the fixing section 21 of the adjusting member 20 is disposed opposite to one of the first end face 121 or the second end face 131 along the axial direction of the hub body 10. The first fasteners 511 are used to connect the fixing section 21 and the hub body 10, and the plurality of second fasteners 521 are used to connect the adjusting section 22 and the hub body 10, so that the adjusting member 20 is fixed to the hub body 10. It should be understood that this arrangement further reduces the number of parts in the weldless hydraulic coupling hub, simplifies the assembly process, and facilitates a compact layout, resulting in a smaller space occupied by the weldless hydraulic coupling hub in the hydraulic coupling.

[0067] It is worth mentioning that fixing the adjusting section 22 to the hub body 10 with the second fastener 521 helps to prevent the adjusting section 22 from twisting circumferentially relative to the hub body 10, thereby reducing the risk of friction between the adjusting section 22 and the hub body 10. Furthermore, this arrangement also helps to position the axial relative position of the adjusting member 20 and the hub body 10, thus helping to ensure that the first seal 41 is axially clamped between the fixed section 21 and the hub body 10, reducing the risk of hydraulic oil leakage.

[0068] In at least one embodiment, such as Figure 3 and Figure 7 As shown, the first fastener 511 passes through the fixing section 21 of the adjusting member 20 along the axial direction of the hub body 10 and is screwed into the hub body 10; the second fastener 521 passes through the adjusting section 22 of the adjusting member 20 along the radial direction of the hub body 10 and is screwed into the hub body 10.

[0069] In some embodiments, such as Figure 2 As shown, the hub body 10 includes an integrally formed hub disc 12 and hub joint 13. Specifically, the outer diameter of the hub disc 12 is larger than the outer diameter of the hub joint 13. The end face of the hub disc 12 forms a first end face 121, and the end face of the hub joint 13 forms a second end face 131. It is worth mentioning that the outer periphery of the hub disc 12 may be provided with retaining teeth 122 for mounting a serpentine spring, or it may not be provided with retaining teeth 122. This application does not impose specific limitations on this.

[0070] In at least one embodiment, such as Figures 1-4 As shown, the fixed section 21 of the adjusting member 20 and the second end face 131 are arranged opposite each other along the axial direction of the hub body 10. Specifically, the outer diameter of the fixed section 21 is the same as or slightly smaller than the outer diameter of the shaft joint 13; in other words, the outer peripheral surface of the fixed section 21 is flush with or slightly lower than the outer peripheral surface of the shaft joint 13. This arrangement helps to avoid interference between the adjusting member 20 and other devices.

[0071] In at least one embodiment, such as Figures 5-8 As shown, the fixing section 21 of the adjusting member 20 is arranged opposite to the first end face 121 along the axial direction of the hub body 10. Specifically, the outer diameter of the fixing section 21 is smaller than the outer diameter of the shaft disk 12 and is adapted to the inner diameter of the shaft disk 12, so that the fixing section 21 is embedded in the inner side of the shaft disk 12; preferably, the outer surface of the fixing section 21 is flush with or slightly lower than the first end face 121, which helps to avoid interference between the adjusting member 20 and other devices.

[0072] In at least one embodiment, such as Figures 9-12As shown, the mounting section 5221 of the stop 522 is arranged opposite to the first end face 121 along the axial direction of the hub body 10. Specifically, the outer diameter of the mounting section 5221 is smaller than the outer diameter of the shaft disk 12 and is adapted to the inner diameter of the shaft disk 12, so that the mounting section 5221 is embedded in the inner side of the shaft disk 12; preferably, the outer surface of the mounting section 5221 is flush with or slightly lower than the first end face 121, which helps to avoid interference between the stop 522 and other devices.

[0073] In at least one embodiment, such as Figures 13-16 As shown, the mounting section 5221 of the stop 522 is arranged opposite to the second end face 131 along the axial direction of the hub body 10. Specifically, the portion of the shaft joint 13 near the second end face 131 has a stepped surface 132, and the outer extension 5223 of the stop 522 is located on the outer periphery of the stepped surface 132. The inner diameter of the outer extension 5223 is adapted to the outer diameter of the stepped surface 132 so that the stop 522 can be fitted onto the shaft joint 13. Furthermore, the outer diameter of the outer extension 5223 is the same as or slightly smaller than the outer diameter of the shaft joint 13; in other words, the outer peripheral surface of the outer extension 5223 is flush with or slightly lower than the outer peripheral surface of the shaft joint 13. This arrangement helps to avoid interference between the stop 522 and other components.

[0074] In some embodiments, such as Figure 4 , Figure 8 , Figure 12 and Figure 16 As shown, the hub body 10 has an oil passage 14, which is connected to the hydraulic chamber 30 and is used to inject hydraulic oil into and release hydraulic oil from the hydraulic chamber 30. The weldless hydraulic coupling hub also includes a sealing member 60, which is installed on the hub body 10 and is used to seal the oil passage 14, thereby sealing the hydraulic chamber 30.

[0075] In at least one embodiment, the plug 60 has a drive hole, such as a square hole or a hexagonal hole. By inserting a suitable tool into the drive hole, the plug 60 can be moved to adjust its position within the oil passage 14, thereby adjusting the oil pressure within the hydraulic chamber 30. It should be understood that this arrangement helps avoid frequent disassembly of the plug 60 during oil pressure adjustment, i.e., adjusting the diameter of the shaft hole 221, thus improving the ease of use of the hydraulic coupling. Furthermore, this arrangement facilitates stepless pressure regulation, i.e., stepless adjustment of the diameter of the shaft hole 221.

[0076] In at least one embodiment, such as Figure 4 , Figure 8 , Figure 12 and Figure 16As shown, the hub body 10 has multiple circumferentially distributed oil passages 14, each with a corresponding sealing element 60. This arrangement helps to achieve multi-point injection and release of hydraulic oil along the circumference of the hydraulic chamber 30, thereby improving the efficiency of adjusting the bore diameter of the shaft hole 221. It also helps to avoid uneven pressure distribution caused by a single oil passage 14, improving the uniformity of deformation and response consistency of the adjusting section 22 of the adjusting element 20 under the pressure of the hydraulic oil.

[0077] In at least one embodiment, along the circumference of the hub body 10, the oil passage 14 is offset from the first connecting component 51 of the connecting assembly 50; in other words, the oil passage 14 on the hub body 10 and the through hole through which the first connecting component 51 passes are offset. It should be understood that this arrangement helps to avoid adverse effects on the structural strength of the hub body 10 due to the opening of the oil passage 14 and the through hole; in other words, it can preserve the continuous cross-section of the hub body 10 to a greater extent, thereby maintaining the structural strength of the hub body 10, and reducing the risk of defects such as cracks in the hub body 10 during processing or operation, and can further reduce the risk of hydraulic oil leakage in the hydraulic chamber 30.

[0078] In at least one embodiment, such as Figure 4 , Figure 8 , Figure 12 and Figure 16 As shown, along the radial direction of the hub body 10, the connection between the oil passage 14 and the hydraulic chamber 30 is positioned opposite to the first reservoir 222. As mentioned above, the first reservoir 222 provides additional buffering and accommodating space, which helps to avoid excessive local deformation or stress concentration of the adjusting component 20 due to excessive instantaneous pressure or uneven flow of hydraulic oil; and can reduce the direct impact of oil pressure fluctuations on the first seal 41 and the second seal 42, thereby extending the service life of the sealing assembly 40.

[0079] In some embodiments, such as Figure 1 , Figure 5 , Figure 9 and Figure 13As shown, the hub body 10, adjusting member 20, and stop member 522 are all cylindrical. The connecting assembly 50 is evenly distributed along the circumference of the hub body 10 to connect the hub body 10 and the adjusting member 20. It should be understood that this arrangement helps ensure that the tightening force of the connecting assembly 50 is uniformly transmitted axially, thereby maintaining the coaxiality of the hub body 10 and the adjusting member 20, and helping to avoid uneven wear of the first seal 41 and the second seal 42 due to eccentricity. Furthermore, through the combined action of the cylindrical hub body 10 and the stop member 522, as well as the evenly distributed connection points of the first connecting assembly 51 and the second connecting assembly 52, the radial elastic deformation of the adjusting member 20 under the pressure of hydraulic oil is symmetrical and consistent along the circumference, which helps the second seal 42 maintain good radial following.

[0080] A hydraulic coupling includes the aforementioned weldless hydraulic coupling hub. It should be understood that the weldless hydraulic coupling hub can form the hydraulic cavity 30 without welding, thereby reducing the difficulty of forming the hydraulic cavity 30. Furthermore, it helps to avoid defects such as deformation, stress concentration, and porosity in the hub body 10 and adjusting component 20 due to the welding process, thereby reducing the risk of hydraulic oil leakage and improving the reliability of the hydraulic coupling.

[0081] The basic principles, main features, and advantages of this invention have been described above. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection claimed by this invention is defined by the appended claims and their equivalents.

Claims

1. A weldless hydraulic coupling hub, characterized by, include: A hub body having a receiving hole extending axially along the hub body, the wall of the receiving hole forming the inner peripheral wall of the body; An adjusting member includes an adjusting section extending into the receiving hole and disposed radially opposite to the inner peripheral wall of the main body along the hub body. A hydraulic cavity is formed between the adjusting section and the inner peripheral wall of the main body. The adjusting member defines a shaft hole for accommodating a shaft body. By injecting hydraulic oil into or releasing hydraulic oil from the hydraulic cavity, the adjusting section can grip the shaft body. A sealing assembly is disposed between the hub body and the adjusting member for sealing the hydraulic chamber; A connecting assembly for detachably mechanically connecting the hub body and the adjusting member, such that the hub body and the adjusting member clamp the sealing assembly.

2. The weldless hydraulic coupling hub of claim 1, wherein, The sealing assembly includes an annular first seal and a second seal, which are spaced apart along the axial direction of the hub body. A hydraulic cavity is formed between the first seal and the second seal. The adjusting section undergoes radial elastic deformation under the pressure of hydraulic oil in the hydraulic cavity to grip the shaft.

3. The weldless hydraulic coupling hub of claim 2, wherein, The outer peripheral wall of the adjusting section is provided with a first reservoir for accommodating hydraulic oil. Along the axial direction of the hub body, the size of the first reservoir is smaller than the size of the adjusting section. The first reservoir is located between the first seal and the second seal. And / or a second reservoir for accommodating hydraulic oil is provided on the inner peripheral wall of the main body. Along the axial direction of the hub body, the size of the second reservoir is smaller than the size of the adjusting section. The second reservoir and the adjusting section are arranged opposite to each other along the radial direction of the hub body. The second reservoir is located between the first seal and the second seal.

4. The no-weld hydraulic coupling hub of claim 2, wherein, The adjusting component also includes a fixing section integrally formed with the adjusting section. The outer diameter of the fixing section is larger than the outer diameter of the adjusting section. The fixing section and the end face of the hub body are arranged opposite to each other along the axial direction of the hub body. The first sealing member is clamped along the axial direction of the hub body between the end face of the hub body and the fixed section of the adjusting member; the second sealing member is clamped along the radial direction of the hub body between the inner peripheral wall of the body and the adjusting section of the adjusting member.

5. The weldless hydraulic coupling hub of any one of claim 4, wherein, The connecting assembly includes a first connecting assembly and a second connecting assembly. The first connecting assembly is used to connect the fixed section of the adjusting member and the hub body. The first connecting assembly is located on the side of the first seal member away from the hydraulic chamber. The second connecting assembly is used to connect the adjusting section of the adjusting member and the hub body, and the second connecting assembly is located on the side of the second seal away from the hydraulic chamber.

6. The weldless hydraulic coupling hub according to claim 5, characterized in that, The hub body includes a first end face and a second end face that are disposed opposite to each other along the axial direction of the hub body. The second connecting assembly includes a stop member and a plurality of second fasteners. The stop member includes an integrally formed mounting section and a stop section. The outer diameter of the mounting section is larger than the outer diameter of the stop section. The mounting section is disposed opposite to one of the first end face or the second end face along the axial direction of the hub body. The stop section extends into the receiving hole along the radial direction of the hub body. A portion of the adjusting section is located between the stop section and the inner peripheral wall of the body along the radial direction of the hub body. Several second fasteners are used to connect the mounting section and the hub body; The fixed section of the adjusting member is disposed opposite to the other of the first end face or the second end face along the axial direction of the hub body.

7. The weldless hydraulic coupling hub according to claim 6, characterized in that, The stop also includes an extension section connected to the outer edge of the mounting section. The extension section extends axially along the outer periphery of the hub body and radially along the hub body. A portion of the hub body and a portion of the adjusting section are located between the extension section and the stop section.

8. The weldless hydraulic coupling hub according to any one of claims 1-4, characterized in that, The hub body has an oil passage that communicates with the hydraulic chamber and is used to inject hydraulic oil into and release hydraulic oil from the hydraulic chamber. The weldless hydraulic coupling hub also includes a sealing element, which is installed on the hub body to seal the oil passage.

9. The weldless hydraulic coupling hub according to claim 8, characterized in that, Along the circumference of the hub body, the oil passage is offset from the first connecting component of the connecting assembly.

10. A hydraulic coupling, characterized in that, Includes the weldless hydraulic coupling hub as described in any one of claims 1-9.

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