Hub bearing limiting mechanism and hub assembly

Abstract

This invention relates to the field of bicycles, specifically to a hub bearing limiting mechanism and hub assembly. It is used to axially limit two rolling bearings mounted on the bottom bracket. Each rolling bearing includes an inner bearing ring connected to the bottom bracket and an outer bearing ring connected to the hub housing. The hub bearing limiting mechanism includes two limiting components, each comprising a fastening nut and an inner pressing member. The inner pressing member includes a fixed ring, a rotating ring, and several balls embedded between the fixed ring and the rotating ring. The rotating ring has a pressing surface on its end face adapted to the outer bearing ring. A compression spring connects the fixed ring to the bottom bracket. The inner pressing member also includes a locking structure. This invention uses a fastening nut and an inner pressing member to bidirectionally clamp the rolling bearings, with the rotating ring rigidly abutting against the outer bearing ring. The compression spring self-adapts to preload, and the locking structure rigidly locks, eliminating gaps and ensuring stable transmission with high coaxiality and no slippage.

Description

Technical Field

[0001] This invention relates to the field of bicycles, specifically to a hub bearing limiting mechanism and a hub assembly. Background Technology

[0002] As a key component of the bicycle drivetrain, the hub primarily supports the wheel and facilitates rotational transmission between the bottom bracket and the wheelset. To ensure smooth transmission and structural stability, modern hubs generally use rolling bearings to connect the hub housing to the bottom bracket, allowing the hub housing to rotate freely around the bottom bracket. However, rolling bearings themselves lack axial restraint. Without an effective restraint structure, under dynamic loads such as braking force, driving force, and road impacts during riding, the bearing is prone to axial movement, leading to a loose hub housing, unstable transmission, increased abnormal noise, and severely impacting riding efficiency.

[0003] A bicycle hub with a bearing limiting structure, currently disclosed in Chinese Patent Publication No. CN119058280B, includes a hub body. Mounting rings are fixed to both the left and right sides of the hub body. A hub shaft body passes through the inner side of the two mounting rings and the hub body. A fixing limiting component is installed on the inner side of the left mounting ring, and an assembly limiting component is installed on the inner side of the right mounting ring. The fixing limiting component includes a fixed bearing fixedly mounted on the outer side of the hub shaft body, a first limiting ring fixed to the inner side of the hub body, an annular abutment plate abutting the left side of the fixed bearing, several insertion rods fixed to the right side of the annular abutment plate, several insertion slots opened on the left side of the left mounting ring, and several first connecting holes opened on the left side of the annular abutment plate.

[0004] According to the aforementioned patent, the patent uses multiple sets of plug-in limiting structures to axially fix the bearings on both sides, and utilizes clearance grooves to avoid contact with the inner ring of the bearing, effectively preventing displacement and reducing friction, thereby improving transmission efficiency and stability. However, the aforementioned patent uses a rigid limiting structure, which, although it can achieve axial fixation of the bearing, is difficult to compensate for manufacturing or installation errors, and is prone to insufficient preload or overload.

[0005] Therefore, there is a need for a hub bearing limiting mechanism and hub assembly with adaptive adjustment capabilities, which can automatically compensate for manufacturing tolerances and installation deviations during assembly, ensuring that the bearing outer ring and the end face of the hub housing fit tightly together, and achieving high coaxiality limiting. Summary of the Invention

[0006] To address the problems existing in the prior art, a hub bearing limiting mechanism and hub assembly are provided. The rolling bearing is bidirectionally clamped by a fastening nut and an inner pressing member, the rotating ring rigidly abuts against the outer ring of the bearing, the compression spring adaptively preloads, and the locking structure rigidly locks, eliminating gaps and ensuring stable transmission with high coaxiality and no axial movement.

[0007] To address the problems of existing technologies, this invention provides a hub bearing limiting mechanism for axially limiting two rolling bearings mounted on a central shaft. Each rolling bearing includes an inner ring connected to the central shaft and an outer ring connected to the hub housing. The hub bearing limiting mechanism includes two limiting components, one corresponding to one rolling bearing. Each limiting component includes a fastening nut threaded to the end of the central shaft for applying an axial limiting force to the rolling bearing from the outside, and an inner pressing member disposed on the central shaft and located inside the fastening nut for applying an axial limiting force from the inside. The rolling bearing provides axial support. The inner pressing component includes a fixed ring, a rotating ring, and a plurality of balls embedded between the fixed ring and the rotating ring. The fixed ring and the rotating ring are coaxially sleeved on the central shaft and are clearance-fitted with the central shaft. The rotating ring has a pressing surface adapted to its end face on the side near the outer ring of the bearing. A compression spring is connected between the fixed ring and the central shaft to provide an axial preload force to the rotating ring toward the outer ring of the bearing. The inner pressing component also includes a locking structure to rigidly lock the axial position of the rotating ring after the rolling bearing is installed in place.

[0008] Preferably, a fixed sleeve is fixedly sleeved in the middle of the central shaft, and annular flanges are formed at both ends of the fixed sleeve. A movable sleeve is sleeved on the annular flanges extending inward from the fixed ring. The compression spring is sleeved on the central shaft, and the two ends of the compression spring abut against the annular flanges and the fixed rings, respectively.

[0009] Preferably, the locking structure includes a plurality of wedges evenly distributed along the circumference of the fixed sleeve. The wedges are capable of sliding radially along the fixed sleeve. The fixed sleeve and the central shaft are provided with radial grooves for accommodating the wedges. A hollow insert shaft is inserted into the central shaft. The upper and lower ends of the wedges are respectively provided with guide slopes for abutting and cooperating with the movable sleeve and the hollow insert shaft, respectively.

[0010] Preferably, the end faces of the movable sleeve and the hollow insert shaft that abut against the wedge block are both inclined structures that cooperate with them.

[0011] Preferably, the radial groove is provided with rubber blocks symmetrically arranged on both sides of the wedge, and the wedge is provided with a guide shaft that passes through the rubber blocks. The two ends of the guide shaft are respectively embedded in the corresponding rubber blocks to form a support structure for providing radial elastic restoring force.

[0012] Preferably, the hollow insert shaft has an external thread near its outer end on its outer side, and the inner side of the central shaft has an internal thread near its end that mates with the external thread. When the hollow insert shaft is screwed until its inclined structure abuts against the guide inclined surface of the wedge, the wedge is clamped between the hollow insert shaft and the movable sleeve and is in a radially locked state.

[0013] Preferably, the movable sleeve is provided with a radially penetrating pin at the position corresponding to the annular flange, and the pin spans both sides of the annular flange to form an anti-detachment structure that prevents the movable sleeve from axially dislodging.

[0014] The present invention also provides a hub assembly, including a bottom bracket and a hub housing, wherein both ends of the hub housing are rotatably connected to the bottom bracket via the rolling bearings, and further includes the hub bearing limiting mechanism, which is disposed inside the hub housing.

[0015] Preferably, the outer ring of the rolling bearing is provided with a plurality of locking blocks along the circumferential direction, and the inner wall of the hub housing is provided with corresponding locking grooves.

[0016] Preferably, the inner wall of the hub shell is provided with a through groove along the axial direction, and the outer periphery of the rotating ring is provided with a boss that slides and engages with the through groove.

[0017] The advantages of this application compared to the prior art are:

[0018] 1. This invention uses a bidirectional limiting assembly consisting of a fastening nut and an inner pressing member at both ends of the central shaft to clamp the rolling bearing between the two end faces of the hub housing. The rotating ring in the inner pressing member forms a rotatable but axially linked structure with the fixed ring through ball bearings, and its pressing surface rigidly abuts against the end face of the bearing outer ring. The fixed ring is sleeved on the annular flange of the fixed sleeve through a movable sleeve, and a compression spring provides continuous axial preload.

[0019] Once the rolling bearing is installed, the compression spring automatically adjusts its compression, pushing the rotating ring to tightly fit against the bearing's outer ring, eliminating assembly gaps. Subsequently, the locking structure rigidly locks the axial position of the movable sleeve, preventing the rotating ring from retracting. This securely confines the rolling bearing within the hub housing, ensuring high coaxiality and stable transmission without any movement.

[0020] 2. This invention uses a wedge block set within a radial groove formed by the fixed sleeve and the central shaft, and utilizes the inclined structures at the upper and lower ends of the movable sleeve and the hollow insert shaft to abut against the upper and lower guide inclined surfaces of the wedge block, forming a bidirectional reverse clamping. When the hollow insert shaft is screwed in, its inclined structure pushes the lower end of the wedge block, while the movable sleeve driven by the compression spring simultaneously presses the upper end of the wedge block, so that the wedge block is rigidly supported and locked in the radial groove.

[0021] Meanwhile, the pre-compressed rubber blocks on both sides of the wedge provide continuous elastic pressure, ensuring that its guiding slope always fits tightly with the inclined structure of the movable sleeve and the hollow insert shaft, eliminating gaps and wobbling. Thus, the radial locking of the wedge fixes the axial position of the movable sleeve, thereby firmly limiting the rotating ring and rolling bearing, effectively preventing axial movement during operation, and improving locking reliability and transmission stability.

[0022] 3. This invention integrates the hub bearing limiting mechanism into the inner side of the hub housing, and works in conjunction with the outer fastening nut to clamp the rolling bearing, thereby achieving bidirectional axial limiting.

[0023] Meanwhile, the outer ring of the bearing is embedded in a groove on the inner wall of the hub housing via a circumferential locking block, ensuring efficient torque transmission and preventing circumferential slippage. The boss on the outer circumference of the swivel ring slides into the axial through-groove of the hub housing, forcing it to rotate synchronously with the hub housing while retaining axial micro-motion freedom to accommodate preload and locking processes. This effectively avoids axial movement and circumferential slippage, ensuring high coaxiality and transmission response accuracy while improving the operational stability and long-term reliability of the hub assembly. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the hub bearing limiting mechanism and hub assembly of the present invention.

[0025] Figure 2 This is a three-dimensional structural cross-sectional view of the hub bearing limiting mechanism and hub assembly of the present invention.

[0026] Figure 3 This is a planar sectional view of the hub bearing limiting mechanism and hub assembly of the present invention.

[0027] Figure 4 This is a partial three-dimensional structural cross-sectional view of the hub bearing limiting mechanism and hub assembly of the present invention.

[0028] Figure 5 This is a partial planar sectional view of the hub bearing limiting mechanism and hub assembly of the present invention.

[0029] Figure 6 This is an exploded three-dimensional structural diagram of the hub bearing limiting mechanism and hub assembly of the present invention.

[0030] Figure 7 This is a three-dimensional structural diagram of the hub bearing limiting mechanism and the rolling bearing and limiting component of the hub assembly of the present invention.

[0031] Figure 8 This is an exploded three-dimensional structural diagram of the hub bearing limiting mechanism and the rolling bearing and limiting component of the hub assembly of the present invention from a first perspective.

[0032] Figure 9 This is an exploded three-dimensional structural diagram of the hub bearing limiting mechanism and the rolling bearing and limiting component of the hub assembly of the present invention from a second perspective.

[0033] Figure 10 This is an exploded three-dimensional structural diagram of the hub bearing limiting mechanism and the fixed sleeve and movable sleeve of the hub assembly of the present invention.

[0034] The following are the labels in the diagram: 1. Bottom shaft; 11. Hollow insert shaft; 2. Hub housing; 21. Slot; 211. Locking block; 22. Through slot; 221. Boss; 3. Rolling bearing; 31. Inner bearing ring; 32. Outer bearing ring; 4. Limiting assembly; 41. Fastening nut; 42. Inner pressing component; 421. Fixing ring; 4211. Compression spring; 422. Rotating ring; 423. Ball bearing; 43. Locking structure; 431. Wedge block; 5. Fixing sleeve; 51. Annular flange; 511. Pin; 52. Radial groove; 521. Rubber block; 522. Guide shaft; 6. Movable sleeve. Detailed Implementation

[0035] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0036] See Figures 1 to 6 As shown, the hub bearing limiting mechanism is used to axially limit the two rolling bearings 3 sleeved on the central shaft 1. Each rolling bearing 3 includes an inner bearing ring 31 connected to the central shaft 1 and an outer bearing ring 32 connected to the hub housing 2. The hub bearing limiting mechanism includes two limiting components 4, one of which corresponds to one rolling bearing 3. Each limiting component 4 includes a fastening nut 41 threaded to the end of the central shaft 1, used to apply an axial limiting force to the rolling bearing 3 from the outside, and an inner pressing member 42 disposed on the central shaft 1 and located inside the fastening nut 41, used to provide axial support to the rolling bearing 3 from the inside. 2 includes a fixed ring 421, a rotating ring 422, and a plurality of balls 423 embedded between the fixed ring 421 and the rotating ring 422. The fixed ring 421 and the rotating ring 422 are coaxially sleeved on the central shaft 1 and are clearance-fitted with the central shaft 1. The rotating ring 422 has a pressing surface adapted to its end face on the side near the outer ring 32 of the bearing. A compression spring 4211 is connected between the fixed ring 421 and the central shaft 1 to provide an axial preload force to the rotating ring 422 toward the outer ring 32 of the bearing. The inner pressing member 42 also includes a locking structure 43 to rigidly lock the axial position of the rotating ring 422 after the rolling bearing 3 is installed in place.

[0037] During the assembly of the hub bearing limiting mechanism, the hub shell 2 is first fitted onto the central shaft 1, centered along the axial direction of the central shaft 1. Then, rolling bearings 3 are inserted from the outside inwards at both ends of the central shaft 1, so that the outer rings 32 of the two rolling bearings 3 press against the left and right end faces of the hub shell 2, thereby clamping and positioning the hub shell 2 between the two rolling bearings 3. At this time, the inner rings 31 of the rolling bearings 3 are fixedly connected to the central shaft 1, ensuring that they do not rotate with the hub shell 2. The outer rings 32 of the bearings, however, form a torque transmission fit with the hub shell 2, allowing the hub shell 2 to rotate synchronously with the outer rings 32.

[0038] Next, fastening nuts 41 are installed at each end of the central shaft 1, screwed into the external threads of the end of the central shaft 1, and gradually pushed inward to apply an axial limiting force from the outside of the rolling bearing 3, initially restricting the outward movement of the rolling bearing 3. At the same time, an inner pressing member 42 is provided on the inner side of the fastening nut 41, that is, on the side closer to the center of the hub housing 2, to provide reverse support to the rolling bearing 3 from the inside.

[0039] In the initial state, the compression spring 4211 continuously applies an axial preload force toward the rolling bearing 3 to the rotating ring 422. When the rolling bearing 3 is pushed in and contacts the end face of the hub housing 2, the outer ring 32 of the bearing will further press against the pressing surface of the rotating ring 422, and the compression spring 4211 will then generate elastic compression, causing the rotating ring 422 to automatically fine-tune its axial position until the outer ring 32 of the bearing, the end face of the hub housing 2, and the rotating ring 422 are tightly fitted together, eliminating assembly gaps and achieving self-adaptive preload with high coaxiality.

[0040] Finally, the locking structure 43 is activated to rigidly lock the axial position of the rotating ring 422. Once locked, the rotating ring 422 can no longer move axially, and the limiting space formed by it and the outer fastening nut 41 is permanently fixed, thus firmly clamping the rolling bearing 3 between the inner pressing member 42 and the fastening nut 41. The entire limiting process uses the hub housing 2 as a reference for bidirectional clamping, achieving assembly tolerance compensation through the compression spring 4211 and ensuring long-term operational stability through mechanical locking, effectively guaranteeing the stability of the transmission.

[0041] See Figures 4 to 10 As shown, a fixed sleeve 5 is fixedly sleeved in the middle of the central shaft 1. The two ends of the fixed sleeve 5 form annular flanges 51 respectively. A movable sleeve 6 is sleeved on the annular flange 51 extending inward from the fixed ring 421. The compression spring 4211 is sleeved on the central shaft 1. The two ends of the compression spring 4211 abut against the annular flange 51 and the fixed ring 421 respectively.

[0042] During the limiting process before the hub is in normal operation, when the rolling bearing 3 is installed in place and presses against the end face of the hub housing 2, its outer ring will push the rotating ring 422 inward. The rotating ring 422 transmits the axial force to the fixed ring 421 through the ball bearing 423, thereby driving the fixed ring 421 and its inwardly extending movable sleeve 6 to move together towards the center of the central shaft 1.

[0043] Since the movable sleeve 6 is fitted around the annular flange 51 at the end of the fixed sleeve 5, this movement synchronously compresses the compression spring 4211 located between the fixed ring 421 and the annular flange 51. This ensures that the pressing surface of the rotating ring 422 is always tightly fitted to the end face of the bearing outer ring 32, thereby forming a stable axial preload and ensuring that there is no gap or looseness between the bearing outer ring 32 and the hub housing 2, achieving initial positioning with high coaxiality.

[0044] See Figures 4 to 10 As shown, the locking structure 43 includes a plurality of wedges 431 evenly distributed along the circumference of the fixed sleeve 5. The wedges 431 can slide radially along the fixed sleeve 5. The fixed sleeve 5 and the central shaft 1 are provided with a radial groove 52 for accommodating the wedges 431. A hollow insert shaft 11 is inserted into the central shaft 1. The upper and lower ends of the wedges 431 are respectively provided with guide slopes for abutting and cooperating with the movable sleeve 6 and the hollow insert shaft 11 respectively.

[0045] During the limiting and locking process, the movable sleeve 6, due to the preload of the compression spring 4211, pushes the guide slope at the upper end of the wedge block 431 outward from the outside. Since the wedge block 431 is constrained within the radial groove 52 formed by the fixed sleeve 5 and the central shaft 1, the wedge block 431 can only slide radially. As the movable sleeve 6 pushes, the wedge block 431 moves towards the center of the central shaft 1.

[0046] When the hollow insert shaft 11 is screwed into the central shaft 1, its front end gradually approaches and abuts against the guide slope at the lower end of the wedge block 431. Meanwhile, the movable sleeve 6 continuously abuts against the guide slope at the upper end of the wedge block 431. The opposing forces from the two slopes cause the wedge block 431 to be tightened and locked in the radial groove 52. At this point, the wedge block 431 can no longer move radially, thus locking the axial position of the movable sleeve 6 in the opposite direction. Once the wedge block 431 is rigidly fixed, the movable sleeve 6 cannot retract or move. Therefore, the axial position of the rotating ring 422 is rigidly locked, ensuring reliable positioning of the rolling bearing 3.

[0047] See Figures 4 to 10 As shown, the end faces of the movable sleeve 6 and the hollow insert shaft 11 that abut against the wedge block 431 are both inclined structures that cooperate with them.

[0048] During the locking process, the movable sleeve 6 and the hollow insert shaft 11 respectively engage with the guide slopes at the upper and lower ends of the wedge block 431 through their respective inclined structures. The inclined structure of the movable sleeve 6 abuts against the guide slope at the upper end of the wedge block 431, applying a radially downward component force. Meanwhile, the inclined structure of the hollow insert shaft 11 abuts against the guide slope at the lower end of the wedge block 431, applying a radially upward component force.

[0049] Since the wedge 431 is confined within the radial groove 52 formed by the fixed sleeve 5 and the central shaft 1, it cannot move freely in the radial direction, ensuring that the position of the rotating ring 422 and the rolling bearing 3 does not move axially during operation.

[0050] See Figures 4 to 10 As shown, the radial groove 52 is provided with rubber blocks 521 symmetrically arranged on both sides of the wedge block 431. The wedge block 431 is provided with a guide shaft 522 that passes through the rubber block 521. The two ends of the guide shaft 522 are respectively embedded in the corresponding rubber blocks 521 to form a support structure for providing radial elastic restoring force.

[0051] During the locking process, the wedge 431 needs to rely on the guide slopes at its upper and lower ends to fit tightly with the slope structure of the movable sleeve 6 and the hollow insert shaft 11 respectively, so as to achieve reliable force transmission and rigid locking.

[0052] To ensure the effectiveness of this inclined surface fit, rubber blocks 521 symmetrically arranged on both sides of the wedge 431 within the radial groove 52 are pre-compressed during assembly, applying continuous elastic pressure to the wedge 431 and keeping it stable within the radial groove 52. This ensures that the guiding inclined surface of the wedge 431 remains in close contact with the corresponding inclined surface of the movable sleeve 6 under any working condition, whether in the pre-tightening stage or the locked state, thereby guaranteeing the synchronicity, stability, and reliability of the locking action.

[0053] See Figures 4 to 10 As shown, the hollow insert shaft 11 has an external thread near its outer end on the outer side, and the central shaft 1 has an internal thread near its end that mates with the external thread. When the hollow insert shaft 11 is screwed until its inclined structure abuts against the guide inclined surface of the wedge block 431, the wedge block 431 is clamped between the hollow insert shaft 11 and the movable sleeve 6 and is in a radially locked state.

[0054] During the locking operation, the hollow insert shaft 11 is screwed into the corresponding internal thread at the end of the central shaft 1 through its external thread. As the screwing proceeds deeper, the inclined structure at the front end of the hollow insert shaft 11 gradually approaches and eventually abuts against the guide inclined surface at the lower end of the wedge block 431. At this time, the movable sleeve 6, due to the preload of the compression spring 4211, has pressed its own inclined structure against the guide inclined surface at the upper end of the wedge block 431.

[0055] The outer end of the hollow insert shaft 11 refers to the end of the hollow insert shaft 11 near the fastening nut 41, which has an external thread.

[0056] As the hollow insert shaft 11 is tightened further, its inclined structure pushes the lower end of the wedge block 431 inward, while the inclined structure of the movable sleeve 6 abuts against the upper end of the wedge block 431 from the opposite direction. The combined forces of the two opposing inclined surfaces clamp the wedge block 431 between them. Since the wedge block 431 is confined within the radial groove 52 formed by the fixed sleeve 5 and the central shaft 1, it cannot move freely. Therefore, under this bidirectional clamping action, it is firmly locked and enters a radially locked state, thereby achieving axial limitation of the rotating ring 422.

[0057] See Figure 4 and Figure 5 As shown, the movable sleeve 6 is provided with a radially penetrating pin 511 at the position corresponding to the annular flange 51. The pin 511 spans both sides of the annular flange 51, forming an anti-detachment structure to prevent the movable sleeve 6 from axially dislodging.

[0058] To prevent the movable sleeve 6 from axially dislodging from the annular flange 51 under the action of the compression spring 4211 or when subjected to external impact, a pin 511 is provided. Therefore, when the movable sleeve 6 attempts to axially disengage from the annular flange 51, one end of the pin 511 will abut against the lateral end face of the annular flange 51, forming a mechanical block and effectively limiting its axial displacement.

[0059] Thus, the pin 511 and the annular flange 51 together form a reliable anti-disengagement structure, ensuring that the movable sleeve 6 always remains in the working position.

[0060] See Figures 1 to 6 As shown, the hub assembly includes a bottom bracket 1 and a hub shell 2. Both ends of the hub shell 2 are rotatably connected to the bottom bracket 1 through the rolling bearings 3. It also includes the hub bearing limiting mechanism mentioned above, which is located inside the hub shell 2.

[0061] During the operation of the hub assembly, the bottom bracket 1 serves as a fixed core throughout the entire structure. The hub shell 2 is fitted outside the bottom bracket 1 and forms a rotatable connection with the bottom bracket 1 through the rolling bearings 3 at both ends, allowing the hub shell 2 to rotate freely around the bottom bracket 1 to drive the wheel.

[0062] To ensure that the rolling bearings 3 do not move axially during operation, the hub bearing limiting mechanism is located inside the hub housing 2, specifically in the inner regions of the two rolling bearings 3. A stable and controllable axial limiting force is applied to the rolling bearings 3 from the inside, working in conjunction with the fastening bolts on the outside to firmly clamp the rolling bearings 3 at predetermined positions at both ends of the hub housing 2. Thus, the hub housing 2 rotates smoothly around the central axis 1 via the rolling bearings 3, while the limiting assembly 4 always provides reliable support and positioning inside the hub housing 2, ensuring the coaxiality and stability of the transmission.

[0063] See Figure 2 and Figure 6 As shown, the outer ring of the rolling bearing 3 is provided with a plurality of locking blocks 211 along the circumferential direction, and the inner wall of the hub shell 2 is provided with corresponding locking grooves 21.

[0064] During the operation of the hub assembly, the outer ring 32 of the rolling bearing 3 is embedded in the corresponding groove 21 on the inner wall of the hub housing 2 through several circumferentially distributed locking blocks 211, forming a circumferential meshing fit.

[0065] When the hub housing 2 rotates with the wheel, the torque is directly transmitted to the locking block 211 through the side wall of the locking groove 21, thereby driving the outer ring 32 of the rolling bearing 3 to rotate synchronously, while the inner ring 31 of the bearing remains fixed to the bottom shaft 1. The cooperation between the locking block 211 and the locking groove 21 not only achieves efficient power transmission, but also prevents the outer ring 32 of the bearing from circumferentially slipping or slipping relative to the hub housing 2 under high load or rapid acceleration conditions, ensuring accurate transmission response and stable and reliable structure.

[0066] See Figure 6 As shown, the inner wall of the hub shell 2 is provided with a through groove 22 along the axial direction, and the outer periphery of the rotating ring 422 is provided with a boss 221 that is slidably engaged in the through groove 22.

[0067] During the operation of the hub assembly, the rotating ring 422 rotates together with the outer ring 32 of the rolling bearing 3, and the boss 221 on its outer periphery slides into the through groove 22 opened axially on the inner wall of the hub housing 2. The through groove 22 extends axially along the hub housing 2 and passes through the end face, allowing the boss 221 to be smoothly inserted during assembly and to maintain a sliding fit along the length of the groove in the working state.

[0068] Through the engagement of the boss 221 and the through slot 22, the rotating ring 422 is constrained to rotate only synchronously with the hub housing 2, and cannot circumferentially deflect relative to the hub housing 2. At the same time, necessary axial fine-tuning freedom is retained to accommodate displacement requirements during pre-tensioning and locking processes. This achieves reliable circumferential linkage between the rotating ring 422 and the hub housing 2 while avoiding additional friction or interference, ensuring smooth transmission and precise positioning.

[0069] This invention constructs a bidirectional axial limiting system consisting of fastening nuts 41 and inner pressing members 42 at both ends of the central shaft 1, precisely clamping the rolling bearing 3 between the two end faces of the hub housing 2. The rotating ring 422 in the inner pressing member 42 forms a rotatable but axially linked structure with the fixed ring 421 via balls 423. Its rigid pressing surface is in contact with the end face of the bearing outer ring 32, and in conjunction with the compression spring 4211, it applies an adaptive preload to the movable sleeve 6, automatically eliminating assembly gaps.

[0070] Subsequently, the locking structure 43 clamps the wedge block 431 in opposite directions with the upper and lower inclined surfaces of the hollow insert shaft 11 and the movable sleeve 6, rigidly locking it in the radial groove 52. The pre-pressed rubber blocks 521 on both sides of the wedge block 431 ensure that the inclined surfaces are always tightly fitted, preventing any wobbling. Simultaneously, the bearing outer ring 32 achieves reliable torque transmission by embedding the circumferential locking block 211 into the hub housing 2's locking groove 21. The rotating ring 422's boss 221 slides in conjunction with the axial through-groove 22 of the housing, forcing synchronous rotation while retaining axial fine-tuning freedom. This achieves stable positioning and efficient transmission with high coaxiality and zero axial movement, improving the reliability and durability of the hub assembly.

[0071] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A hub bearing limiting mechanism for axially limiting two rolling bearings sleeved on the central shaft, wherein the rolling bearings include an inner bearing ring connected to the central shaft and an outer bearing ring connected to the hub housing; Its features are, The hub bearing limiting mechanism includes two limiting components, one limiting component corresponding to one rolling bearing, and the limiting component includes: A fastening nut, threaded to the end of the central shaft, is used to apply an axial limiting force to the rolling bearing from the outside; An inner pressing member is provided on the central shaft and located inside the fastening nut, for axial support of the rolling bearing from the inside. The inner pressing component includes a fixed ring, a rotating ring, and a plurality of balls embedded between the fixed ring and the rotating ring; Both the fixed ring and the rotating ring are coaxially sleeved on the central shaft and are clearance-fitted with the central shaft. The rotating ring has a pressing surface on the side near the outer ring of the bearing that is adapted to its end face; A compression spring is connected between the fixed ring and the central shaft to provide an axial preload force to the rotating ring toward the outer ring of the bearing. The inner pressing component also includes a locking structure for rigidly locking the axial position of the rotating ring after the rolling bearing is installed in place. A fixed sleeve is fixedly sleeved in the middle of the central shaft. The two ends of the fixed sleeve are respectively formed into annular flanges. A movable sleeve is sleeved on the annular flanges extending inward from the fixed ring. The compression spring is sleeved on the central shaft. The two ends of the compression spring abut against the annular flanges and the fixed rings respectively. The locking structure includes a plurality of wedges evenly distributed along the circumference of the fixed sleeve. The wedges are capable of sliding radially along the fixed sleeve. The fixed sleeve and the central shaft are provided with radial grooves for accommodating the wedges. A hollow insert shaft is inserted into the central shaft. The upper and lower ends of the wedges are respectively provided with guide slopes for abutting and cooperating with the movable sleeve and the hollow insert shaft, respectively.

2. The hub bearing limiting mechanism according to claim 1, characterized in that, The end faces of the movable sleeve and the hollow insert shaft that abut against the wedge are both inclined structures that cooperate with them.

3. The hub bearing limiting mechanism according to claim 1, characterized in that, The radial groove is provided with rubber blocks symmetrically arranged on both sides of the wedge. The wedge is provided with a guide shaft that passes through the rubber blocks. The two ends of the guide shaft are respectively embedded in the corresponding rubber blocks to form a support structure for providing radial elastic restoring force.

4. The hub bearing limiting mechanism according to claim 2, characterized in that, The hollow insert shaft has an external thread near its outer end on its outer side, and the inner side of the central shaft has an internal thread near its end that mates with the external thread. When the hollow insert shaft is screwed until its inclined structure abuts against the guide inclined surface of the wedge, the wedge is clamped between the hollow insert shaft and the movable sleeve and is in a radially locked state.

5. The hub bearing limiting mechanism according to claim 1, characterized in that, The movable sleeve has a radially penetrating pin at the position corresponding to the annular flange. The pin spans both sides of the annular flange, forming an anti-detachment structure to prevent the movable sleeve from axially dislodging.

6. A hub assembly, comprising a bottom bracket and a hub housing, wherein both ends of the hub housing are rotatably connected to the bottom bracket via rolling bearings, characterized in that, It also includes a hub bearing limiting mechanism as described in any one of claims 1-5, wherein the hub bearing limiting mechanism is disposed inside the hub housing.

7. The hub assembly according to claim 6, characterized in that, The outer ring of the rolling bearing is provided with several locking blocks along the circumference, and the inner wall of the hub housing is provided with corresponding locking grooves.

8. The hub assembly according to claim 6, characterized in that, The inner wall of the hub shell is provided with a through groove along the axial direction, and the outer periphery of the rotating ring is provided with a boss that slides and engages with the through groove.

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