Built-in rotary oil inlet bicycle head structure and bicycle

Abstract

The utility model relates to a built-in rotary oil inlet bicycle head structure and a bicycle. The built-in rotary oil inlet bicycle head structure is used in cooperation with a bicycle frame, a head pipe is fixed to the front end of the bicycle frame, and the bicycle head structure further comprises a front fork rudder pipe, a front fork oil inlet pipe and a rear fork oil inlet pipe, the main core part is assembled on the annular outer wall of the front fork rudder pipe in a threaded mode and at least comprises a core part, an upper cover part and a first oil channel, the core part and the upper cover part are axially arranged, the first oil channel is axially formed in the main core part, the first end of the first oil channel communicates with an oil inlet, and an annular groove part communicating with the second end of the first oil channel is formed in the annular outer wall of the core part; the rotating piece is arranged in the head pipe, is assembled with the head pipe in a positioning manner and at least comprises a rotating sleeve body, the position, corresponding to the annular groove part, of the core part is movably sleeved with the rotating sleeve body, and a second oil channel communicating with the annular groove part is formed in the side wall, corresponding to the annular groove part, of the rotating sleeve body; the bowl assemblies are arranged at the two ends of the head tube respectively so that the front fork rudder tube and the main core piece can be rotationally and axially positioned and assembled on the head tube. Hidden assembly of the oil pipe is achieved, interference of the oil pipe is avoided during steering of the bicycle, and smooth riding is achieved.

Description

Technical Field

[0001] This utility model relates to the field of bicycle accessories technology, specifically to a built-in rotating oil inlet headstock structure and a bicycle. Background Technology

[0002] Currently, the common brake line routing methods for various bicycles on the market mainly adopt the internal routing method in the frame, that is, the brake line connecting to the rear brake down pump extends to the stem below the handlebars and passes through the stem, while the front part still adopts the external routing method, with the brake line connecting to the front brake down pump directly using the external routing method.

[0003] Exposed brake lines not only look unattractive, but they are also more likely to be touched by objects while riding, affecting riding safety and experience. At the same time, for aesthetic reasons, the brake lines that run into the frame need to be as short as possible when exposed, but this creates a new problem: when the vehicle turns, the internal brake lines will be pulled, stretched or twisted as the column rotates, posing a significant safety hazard and greatly reducing the lifespan of the brake lines.

[0004] To address this, we propose a built-in rotating oil inlet head structure and a bicycle. Utility Model Content

[0005] This application provides a built-in rotating oil inlet head structure and bicycle to at least solve the problems of exposed brake oil pipes in the prior art, which not only have poor appearance, but also make the exposed oil pipes likely to be touched by foreign objects during riding, affecting riding safety and riding experience; at the same time, when the vehicle turns, the internal oil pipes will be pulled, pulled or twisted with the rotation of the column, which poses a great safety hazard and greatly reduces the life of the oil pipes.

[0006] In a first aspect, embodiments of this application provide a built-in rotating oil inlet headgear structure, which is used in conjunction with a bicycle frame. The front end of the bicycle frame is fixed with a head tube, and the structure also includes:

[0007] The front fork steerer tube is movably inserted into the head tube;

[0008] The main core component is threadedly fitted onto the annular outer wall of the front fork rudder tube, and includes at least an axially arranged core, an upper cover, and a first oil passage axially opened inside the main core component. The diameter of the core is smaller than the diameter of the upper cover. The first end of the first oil passage is connected to an oil inlet, and the annular outer wall of the core is provided with an annular groove that connects to the second end of the first oil passage.

[0009] A rotating component is disposed inside the head tube and positioned and assembled with the head tube, and includes at least a rotating sleeve. The rotating sleeve is movably sleeved on the core at the position corresponding to the annular groove, and a second oil passage communicating with the annular groove is opened on its side wall corresponding to the annular groove.

[0010] The cup assembly is disposed at both ends of the head tube so that the fork steerer tube and the main core are rotatably and axially positioned on the head tube.

[0011] Optionally, the rotating component further includes:

[0012] Two rotary sealing rings are symmetrically assembled in the first groove formed on the axial inner wall of the rotary sleeve, and the two rotary sealing rings are located on both sides of the assembled position of the annular groove to prevent oil leakage of the annular groove.

[0013] The first bearing is assembled in the second slot opened in the lower part of the core. The inner ring of the first bearing is connected to the core, and the outer ring is connected to the inner wall of the rotating sleeve to maintain the rotational assembly of the rotating component on the main core.

[0014] The bottom cover is threaded onto the lower part of the core to position the axial assembly of the rotating sleeve and the first bearing.

[0015] Optionally, a third groove is provided at the upper end of the rotating sleeve, and a second bearing is assembled in the third groove. The inner ring of the second bearing is connected to the core, and the outer ring is connected to the inner wall of the rotating sleeve. The upper end of the second bearing abuts against the lower end of the first step formed on the annular outer wall of the core, so as to cooperate with the bottom cover to position the axial assembly position of the rotating sleeve.

[0016] Optionally, the fork rudder tube is divided into an upper tube section, a tapered tube section, and a lower tube section along the axial direction, and the diameter of the upper tube section is smaller than the diameter of the lower tube section.

[0017] Optionally, the bowl assembly includes:

[0018] The upper bowl assembly is fitted onto the core and is limited by the lower end of the upper cover, and the outer edge of the upper bowl assembly abuts against the edge of the first end of the head tube;

[0019] The lower cup assembly is fitted onto the lower tube section and is limited by the snap-edge portion formed at the free end of the lower tube section. Its outer edge abuts against the edge of the second end of the head tube to cooperate with the upper cup assembly in axially positioning the main core and the rotating component.

[0020] Optionally, the second oil passage is L-shaped, with its output end located at the lower end of the rotating component and connected to a second oil pipe via a movable oil plug. The movable oil plug and a portion of the second oil pipe are concealed within the inner cavity of the head tube.

[0021] Optionally, the head tube has an oil pipe outlet hole corresponding to the position of the movable oil plug and the second oil pipe.

[0022] Optionally, the head tube has at least one locking hole corresponding to the position of the rotating sleeve, and a locking bolt with its tail threaded to the rotating sleeve and its head located in the locking hole is fitted in the locking hole.

[0023] Optionally, it also includes a handlebar, which is hollow inside and has one end fitted onto the upper pipe section.

[0024] In a second aspect, this application provides a bicycle that includes the built-in rotating oil inlet headstock structure described in the first aspect.

[0025] Compared to related technologies, the built-in rotating oil inlet head structure and bicycle provided in this application embodiment have at least the following technical advantages:

[0026] The rotation of the fork steerer tube drives the rotation of the fork and front wheel to achieve steering. The second hydraulic hose, which runs through the bicycle frame, is quickly connected to the hydraulic circuit inside the head tube, achieving fully concealed assembly. During braking, the second hydraulic hose is mounted on the swivel assembly, which is positioned with the head tube and will not rotate with the steering of the fork steerer tube, ensuring that the second hydraulic hose will not be twisted or damaged. The swivel assembly is movably sleeved on the main core component, and the hydraulic circuit always maintains a continuous state of the first hydraulic passage - annular groove - second hydraulic passage, maintaining normal braking function. At the same time, the two ends of the first hydraulic hose are connected to the rear brake pump and the main core component, respectively. All three of these rotate with the rotation of the fork steerer tube during steering, and steering will not cause the hydraulic hose to twist or be damaged. The rear brake pump can be directly connected as short as possible, improving the aesthetics of the installation and avoiding damage to exposed hydraulic hoses.

[0027] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is one of the perspective views of a built-in rotating oil inlet head structure shown according to an exemplary embodiment.

[0030] Figure 2 This is a second perspective view of the built-in rotating oil inlet head structure shown according to an exemplary embodiment.

[0031] Figure 3This is an exploded view of the built-in rotating oil inlet front structure according to an exemplary embodiment.

[0032] Figure 4 This is one of the cross-sectional views of the built-in rotating oil inlet vehicle head structure shown according to an exemplary embodiment.

[0033] Figure 5 This is a second cross-sectional view of the built-in rotating oil inlet head structure shown according to an exemplary embodiment.

[0034] Explanation of reference numerals in the attached figures:

[0035] Front fork steerer tube 10; upper tube section 101; tapered tube section 102; lower tube section 103; retaining edge section 104;

[0036] Upper bowl set 20;

[0037] Main core component 30; core part 301; upper cover part 302; first oil passage 303; annular groove part 304; oil inlet 305;

[0038] Rotating component 40; Rotating sleeve 401; Second oil passage 402; First bearing 403; Bottom cover 404; Rotating sealing ring 405; Second bearing 406; Locking bolt 407;

[0039] Head tube 50; Oil pipe outlet 501; Locking hole 502;

[0040] Lower cup assembly 60; second oil pipe 70; handle riser 80. Detailed Implementation

[0041] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] In related technologies, exposed brake lines not only have poor aesthetics, but also pose a risk of being touched by external objects while riding, affecting riding safety and experience. At the same time, for aesthetic reasons, the brake lines that run into the frame need to be as short as possible when exposed, but this creates a new problem: when the vehicle turns, the internal brake lines will be pulled, stretched, or twisted as the column rotates, posing a significant safety hazard and greatly reducing the lifespan of the brake lines.

[0045] Based on the above, this utility model provides a built-in rotating oil inlet head structure and a bicycle, which will be described in detail below with reference to specific embodiments and accompanying drawings.

[0046] Example 1

[0047] This utility model embodiment provides a built-in rotating oil inlet head structure. Figure 1 This is one of the perspective views of a built-in rotating oil inlet head structure shown according to an exemplary embodiment. Figure 2 This is a second perspective view of the built-in rotating oil inlet head structure shown according to an exemplary embodiment. Figure 3 This is an exploded view of the built-in rotating oil inlet front structure according to an exemplary embodiment. Figure 4 This is one of the cross-sectional views of the built-in rotating oil inlet vehicle head structure shown according to an exemplary embodiment. Figure 5 This is a second cross-sectional view of the built-in rotating oil inlet vehicle front structure, according to an exemplary embodiment. (See example...) Figure 1-5 As shown, this is a built-in rotating oil inlet headgear structure. It is used with a bicycle frame, the front end of which is fixed with a head tube 50, and also includes:

[0048] The fork steerer tube 10 is movably inserted into the head tube 50. In this embodiment, the fork steerer tube 10 is divided into an upper tube section 101, a tapered tube section 102, and a lower tube section 103 along the axial direction. The diameter of the upper tube section 101 is smaller than the diameter of the lower tube section 103, forming a tapered tube structure. This structure can be compatible with existing stem diameters and can increase the rigidity of the fork. At the same time, when the head tube 50 of the bicycle frame can support a tapered headset, the rigidity of the frame is also significantly improved after assembly.

[0049] The main core component 30 is threadedly fitted onto the annular outer wall of the front fork rudder tube 10, and includes at least an axially arranged core portion 301, an upper cover portion 302, and a first oil passage 303 axially opened inside the main core component 30. The diameter of the core portion 301 is smaller than the diameter of the upper cover portion 302. The first end of the first oil passage 303 is connected to an oil inlet 305. In this embodiment, a first oil pipe is installed on the oil inlet 305. The annular outer wall of the core 301 is provided with an annular groove portion 304 that connects to the second end of the first oil passage 303.

[0050] A rotating component 40 is disposed within the head tube 50 and positioned and assembled with the head tube 50. It includes at least a rotating sleeve 401, which is movably fitted onto the core 301 at the position corresponding to the annular groove 304. A second oil passage 402 communicating with the annular groove 304 is opened on the side wall of the rotating component 401. The second oil passage 402 has an oil outlet, on which a second oil pipe is installed. In this embodiment, the head tube 50 at the position corresponding to the rotating sleeve 401 has at least one locking hole 502. A locking bolt 407, with its tail threadedly connected to the rotating sleeve 401 and its head located within the locking hole 502, is fitted into the locking hole 502 to achieve positioning and assembly between the rotating component 40 and the head tube 50.

[0051] The cup assembly is respectively disposed at both ends of the head tube 50 so that the fork steerer tube 10 and the main core 30 are rotatably axially positioned and assembled on the head tube 50.

[0052] It also includes a riser 80, which is hollow inside and has one end fitted onto the upper pipe section 101.

[0053] In the technical solutions of the above embodiments, please refer to the appendix. Figure 1-5 The oil inlet 305 of the first oil passage 303 is connected to the rear brake upper pump via the first oil pipe, and the oil outlet of the second oil passage 402 is connected to the rear brake lower pump via the second oil pipe 70. It is understood that quick-connect oil pipes can be pre-installed on the oil pipes to facilitate quick connection. Quick-connect oil pipes are existing technology and can be obtained by those skilled in the art from public information. This exemplary embodiment uses the quick-connect oil pipe structure disclosed in Chinese Patent ZL202411928412.1, which will not be described in detail here. The second oil pipe 70 runs inside the bicycle frame and extends near the rear brake lower pump to connect to the rear brake lower pump, achieving a fully concealed assembly of the second oil pipe 70. The oil inlet 305 is close to the brake lever of the bicycle, which can minimize the exposure of the first oil pipe. Furthermore, the first oil pipe can be hidden inside the stem tube 80 to achieve a fully concealed assembly.

[0054] When the bicycle turns, the handlebars drive the front fork steerer tube 10 and the main core component 30 connected to the front fork steerer tube 10 to rotate within the head tube 50, thus achieving the steering function. The second hydraulic hose 70, which runs through the bicycle frame, is quickly connected to the hydraulic circuit within the head tube 50, achieving a fully concealed assembly. During braking, the second hydraulic hose 70 is mounted on the swivel assembly 40, and the swivel assembly 40 is positioned with the head tube 50. That is, during steering, the swivel assembly 40 and the head tube 50 remain positioned and will not rotate with steering, thereby preventing the second hydraulic hose 70 from twisting or being damaged. The component 40 is movably mounted on the main core component 30. When turning, the oil circuit always maintains the continuity of the first oil passage 303-ring groove 304-second oil passage 402, maintaining normal braking function. At the same time, the two ends of the first oil pipe are connected to the rear brake pump and the main core component 30 respectively. All three of them rotate with the rotation of the front fork steer tube 10 when turning. Therefore, the first oil pipe will not rotate with the turning and cause the oil pipe to twist and be damaged. There is no need to reserve the turning length of the oil pipe for exposure. It can be hidden inside the assembly, improving the aesthetics of the vehicle and avoiding damage to the exposed oil pipe.

[0055] In this embodiment, please continue to refer to Appendix Figure 1-5 The rotating component 40 further includes:

[0056] Two rotary sealing rings 405 are symmetrically assembled in the first groove formed on the axial inner wall of the rotary sleeve 401, and the two rotary sealing rings 405 are located on both sides of the assembled position of the annular groove 304 to prevent oil leakage of the annular groove 304.

[0057] The first bearing 403 is assembled in the second slot opened at the lower part of the core 301. The inner ring of the first bearing 403 is connected to the core 301, and the outer ring is connected to the inner wall of the rotating sleeve 401 to maintain the rotational assembly of the rotating component 40 on the main core 30. In this embodiment, the ball bearing 404 can be a deep groove ball bearing.

[0058] The bottom cover 404 is threadedly fitted to the lower part of the core 301 to position the axial assembly position of the rotating sleeve 401 and the first bearing 403.

[0059] Further, refer to the appendix Figure 4-5In this embodiment, a third groove is provided at the upper end of the rotating sleeve 401. A second bearing 406 is assembled in the third groove. The inner ring of the second bearing 406 is connected to the core 301, and the outer ring is connected to the inner wall of the rotating sleeve 401. The upper end of the second bearing 406 abuts against the lower end of the first step formed on the annular outer wall of the core 301, so as to cooperate with the bottom cover 404 to position the axial assembly position of the rotating sleeve 401, so as to further reduce the rotational friction between the main core 30 and the rotating part 40, and improve the steering sensitivity and controllability.

[0060] In this embodiment, please continue to refer to Appendix Figure 1-5 The bowl assembly includes:

[0061] The upper bowl assembly 20 is fitted onto the core 301 and is limited by the lower end of the upper cover 302, and the outer edge of the upper bowl assembly 20 abuts against the edge of the first end of the head tube 50.

[0062] The lower cup assembly 60 is sleeved on the lower tube section 103 and limited by the snap-edge portion 104 formed at the free end of the lower tube section 103. Its outer edge abuts against the edge of the second end of the head tube 50 to cooperate with the upper cup assembly 20 to axially position the main core 30 and the rotating component 40.

[0063] In the above embodiment, during assembly, the second oil pipe 70 is first threaded through the bicycle frame, then the lower headset 60 is installed at the lower end of the head tube 50, and the fork steerer tube 10 is inserted.

[0064] Turn the main core 30 upside down, and then install the upper cup assembly 20, the second bearing 406, the rotating sleeve 401, and the first bearing 403 in sequence from top to bottom (that is, the lower part of the main core 30 in the normal state). Tighten the bottom cover 404 with threads.

[0065] The assembled main core component 30 is flipped upright and inserted into the upper part of the fork steerer tube 10. The main core component 30 and the fork steerer tube 10 are screwed together. At this time, the outer edge of the upper headset 20 abuts against the edge of the first end of the head tube 50, and the outer edge of the lower headset 606 abuts against the edge of the second end of the head tube 50, forming a snap-fit ​​structure. It should be noted that the above assembly steps in this embodiment are consistent with the overall assembly steps of existing bicycles. There is no need to change the existing assembly habits of workers when assembling the whole vehicle. It can be directly replaced, and the assembly is faster.

[0066] Connect the second oil pipe 70 to the oil outlet and the first oil pipe to the oil inlet 305 in sequence to complete the oil circuit connection.

[0067] In this embodiment, refer to the appendix. Figure 4The second oil passage 402 is L-shaped, and its output end is located at the lower end of the rotating part 40 and connected to the second oil pipe through a movable oil plug. The movable oil plug and part of the second oil pipe are hidden in the inner cavity of the head tube 50. Furthermore, the head tube 50 is provided with an oil pipe outlet hole 501 corresponding to the position of the movable oil plug and the second oil pipe. On the one hand, it is convenient for the second oil pipe and the movable oil plug to be connected through the oil pipe outlet hole 501. On the other hand, it is also convenient to match the head tube 50 and the frame if they cannot be directly connected. The second oil pipe can pass through the frame and then briefly jump out before entering the inner cavity of the head tube 50 through the oil pipe outlet hole 501 for quick connection.

[0068] In summary, the built-in rotating oil inlet headstock structure provided in Embodiment 1 of this invention achieves concealed assembly of the oil pipes when mounting the bicycle. When the bicycle turns, the rotation of the front fork steerer tube 10 drives the rotation of the front fork and front wheel to achieve steering. The second oil pipe 70, which runs through the bicycle frame, is quickly connected to the oil circuit within the head tube 50 cavity, achieving fully concealed assembly. During braking, the second oil pipe 70 is mounted on the rotating component 40, and the rotating component 40 is positioned and assembled with the head tube 50, preventing rotation with the steering of the front fork steerer tube 10. This ensures that the second oil pipe 70 will not be twisted or damaged, while the rotating part 40 is movably sleeved on the main core part 30. The oil circuit always maintains the continuity of the first oil passage 303-ring groove 304-second oil passage 402, maintaining normal braking function. At the same time, the two ends of the first oil pipe are respectively connected to the rear brake pump and the main core part 30. All three of them rotate with the rotation of the front fork steer tube 10 when turning. Turning will not cause the oil pipe to twist or be damaged. The rear brake pump can be directly connected as short as possible, improving the aesthetics of the vehicle installation and avoiding damage to the exposed oil pipe.

[0069] Example 2

[0070] Embodiment 2 of the present invention provides a bicycle, including the built-in rotating oil inlet headstock structure of Embodiment 1.

[0071] Other undescribed structures are described in Example 1.

[0072] In summary, the built-in rotating oil inlet headstock structure and bicycle provided by this utility model embodiment achieve concealed assembly of the oil pipe during bicycle mounting. When the bicycle turns, the rotation of the front fork steerer tube 10 drives the rotation of the front fork and front wheel to achieve the steering function. The second oil pipe 70, which runs through the bicycle frame, is quickly connected to the oil circuit in the inner cavity of the head tube 50, achieving fully concealed assembly. When braking, the second oil pipe 70 is mounted on the rotating component 40, and the rotating component 40 is positioned and assembled with the head tube 50, so it will not rotate with the turning of the front fork steerer tube 10. The rotation ensures that the second oil pipe 70 will not be twisted or damaged, while the rotating part 40 is movably sleeved on the main core part 30. The oil circuit always maintains the continuity of the first oil passage 303-ring groove 304-second oil passage 402, maintaining normal braking function. At the same time, the two ends of the first oil pipe are respectively connected to the rear brake pump and the main core part 30. All three of them rotate with the rotation of the front fork steer tube 10 when turning. Turning will not cause the oil pipe to twist or be damaged. The rear brake pump can be directly connected as short as possible, improving the aesthetics of the vehicle installation and avoiding damage to exposed oil pipes.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An in-built rotating oil inlet stem structure, which is used in combination with a bicycle frame, a head tube being fixed to a front end of the bicycle frame, characterized in that, It also includes: The front fork steerer tube is movably inserted into the head tube; The main core component is threadedly fitted onto the annular outer wall of the front fork rudder tube, and includes at least an axially arranged core, an upper cover, and a first oil passage axially opened inside the main core component. The diameter of the core is smaller than the diameter of the upper cover. The first end of the first oil passage is connected to an oil inlet, and the annular outer wall of the core is provided with an annular groove that connects to the second end of the first oil passage. A rotating component is disposed inside the head tube and positioned and assembled with the head tube, and includes at least a rotating sleeve. The rotating sleeve is movably sleeved on the core at the position corresponding to the annular groove, and a second oil passage communicating with the annular groove is opened on its side wall corresponding to the annular groove. The cup assembly is disposed at both ends of the head tube so that the fork steerer tube and the main core are rotatably and axially positioned on the head tube.

2. The built-in rotating intake hull structure of claim 1, wherein, The rotating component also includes: Two rotary sealing rings are symmetrically assembled in the first groove formed on the axial inner wall of the rotary sleeve, and the two rotary sealing rings are located on both sides of the assembled position of the annular groove to prevent oil leakage of the annular groove. The first bearing is assembled in the second slot opened in the lower part of the core. The inner ring of the first bearing is connected to the core, and the outer ring is connected to the inner wall of the rotating sleeve to maintain the rotational assembly of the rotating part on the main core. The bottom cover is threaded onto the lower part of the core to position the axial assembly of the rotating sleeve and the first bearing.

3. The built-in rotary intake hull structure of claim 2, wherein The upper end of the rotating sleeve is provided with a third groove, in which a second bearing is assembled. The inner ring of the second bearing is connected to the core, and the outer ring is connected to the inner wall of the rotating sleeve. The upper end of the second bearing abuts against the lower end of the first step formed on the annular outer wall of the core, so as to cooperate with the bottom cover to position the axial assembly position of the rotating sleeve.

4. The built-in rotary intake hull structure of claim 1, wherein The front fork rudder tube is divided into an upper tube section, a tapered tube section, and a lower tube section along the axial direction, and the diameter of the upper tube section is smaller than the diameter of the lower tube section.

5. The built-in rotary intake hull structure of claim 4, wherein The bowl assembly includes: The upper bowl assembly is fitted onto the core and is limited by the lower end of the upper cover, and the outer edge of the upper bowl assembly abuts against the edge of the first end of the head tube; The lower cup assembly is fitted onto the lower tube section and is limited by the snap-edge portion formed at the free end of the lower tube section. Its outer edge abuts against the edge of the second end of the head tube to cooperate with the upper cup assembly in axially positioning the main core and the rotating component.

6. The built-in rotary intake hull structure of claim 1, wherein The second oil passage is L-shaped, and its output end is located at the lower end of the rotating part and connected to a second oil pipe through a movable oil plug. The movable oil plug and part of the second oil pipe are hidden and assembled in the inner cavity of the head tube.

7. The built-in rotary intake hull structure of claim 6, wherein The head tube has an oil pipe outlet hole corresponding to the position of the movable oil plug and the second oil pipe.

8. The built-in rotary intake hull structure of claim 1, wherein The head tube has at least one locking hole corresponding to the position of the rotating sleeve. A locking bolt with its tail threaded to the rotating sleeve and its head located in the locking hole is fitted into the locking hole.

9. The built-in rotary intake hull structure of claim 4, wherein, It also includes a handlebar, which is hollow inside and has one end fitted onto the upper pipe section.

10. A bicycle characterized in that, It includes the built-in rotating oil inlet head structure as described in any one of claims 1-9.

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