A middle axle with self-lubrication and a bicycle thereof

Abstract

The utility model relates to a bicycle field discloses a kind of middle shaft and its bicycle with self-lubricating. It includes middle shaft sleeve, middle shaft core and end cap, end cap and middle shaft sleeve end portion plug-in connection;End cap inside is equipped with rotating bearing;Middle shaft sleeve, end cap and rotating bearing are all set in middle shaft core, and rotating bearing and middle shaft sleeve are all rotationally connected with middle shaft core;Middle shaft core is equipped with the oil storage groove for storing lubricating oil, and the side of rotating bearing is equipped with oil absorption cotton, and the groove wall of oil storage groove is provided with oil outlet passage;The inner diameter of oil outlet passage is 0.3mm-1.2mm;When middle shaft core is stationary, the tension of lubricating oil at the outlet of oil outlet passage is greater than gravity, and lubricating oil does not flow out;When middle shaft core rotates, lubricating oil slowly infiltrates oil absorption cotton through oil outlet passage, to lubricate rotating bearing. The utility model middle shaft has self-lubricating effect when riding, reduces the number of middle shaft lubrication maintenance;Convenience when lubricating maintenance is improved;Oil outlet passage is not easy to be blocked.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and more specifically, to a self-lubricating bottom bracket and a bicycle thereof. Background Technology

[0002] The bottom bracket is one of the core components of a bicycle, connecting the front and rear wheels and the chain drive system. The bottom bracket consists of a pivot, a sleeve, and end caps. The pivot is inserted into the sleeve and rotatably connected to it. There are two end caps, located at opposite ends of the sleeve, each fitting snugly onto the sleeve. Both ends of the pivot extend through their corresponding end caps in a cantilevered state, allowing for synchronous rotation with the cranks of the pedals. Both end caps have external threads, and the sleeve is inserted into the frame. The threaded connection between the two end caps and the frame connects the entire bottom bracket to the frame. Additionally, each end cap contains a bearing, which is fitted onto the pivot.

[0003] With the increasing popularity of cycling and the growing mileage of bicycles, most existing bottom brackets lack self-lubricating properties. Therefore, to ensure smooth rotation of the bottom bracket during riding, it is necessary to regularly lubricate the bearings inside the bottom bracket end cap. However, adding lubricant to the bottom bracket bearings requires first removing the bolts securing the pedals and cranks, then removing the cranks, and finally removing the end cap to lubricate the bearings inside. This makes bottom bracket lubrication maintenance inconvenient, and since the riding distance is long, the frequency of lubrication maintenance is also relatively high. Utility Model Content

[0004] To address at least one of the aforementioned problems, this utility model provides a self-lubricating bottom bracket, comprising a bottom bracket sleeve, a bottom bracket core, and an end cap. The end cap is located at the end of the bottom bracket sleeve and is inserted into and connected to the bottom bracket sleeve. The end cap is adapted for threaded connection with a vehicle frame, and a rotating bearing is provided inside the end cap. The bottom bracket sleeve, the end cap, and the rotating bearing are all sleeved on the bottom bracket core, and the rotating bearing and the bottom bracket sleeve are rotatably connected to the bottom bracket core. An oil reservoir is provided on the bottom bracket core, and the oil reservoir stores lubricating oil. An oil-absorbing cotton is provided on one side of the bearing, and an oil outlet channel is provided in the wall of the oil storage tank. The oil outlet channel passes through the central shaft, and the oil-absorbing cotton is located at the outlet of the oil outlet channel and is in contact with the rotating bearing. The inner diameter of the oil outlet channel is 0.3mm-1.2mm. When the central shaft is stationary, the tension of the lubricating oil at the outlet of the oil outlet channel is greater than the gravity, making it difficult for the lubricating oil to flow out. When the central shaft rotates, the lubricating oil slowly seeps into the oil-absorbing cotton through the oil outlet channel to lubricate the rotating bearing.

[0005] Optionally, the oil outlet channel is located on the side of the rotating bearing near the central shaft sleeve.

[0006] Optionally, the outer wall of the central shaft is provided with a spiral groove, and multiple spiral grooves are spaced apart circumferentially on the outer peripheral wall of the central shaft, and each of the multiple spiral grooves is coated with grease.

[0007] Optionally, the oil-absorbing cotton is ring-shaped.

[0008] Optionally, a fluororubber ring is provided between the rotating bearing and the central shaft sleeve. The fluororubber ring has an installation ring groove on the side near the rotating bearing. The installation ring groove is connected to the oil outlet channel, and the oil-absorbing cotton is located in the installation ring groove.

[0009] Optionally, the inner wall of the fluororubber ring is provided with an insertion ring groove, and a ceramic ring is provided in the insertion ring groove. The ceramic ring is sleeved on the central shaft core, and the inner peripheral wall of the ceramic ring is in contact with the outer peripheral wall of the central shaft core.

[0010] Optionally, the end of the central shaft extends through the end cap and is cantilevered. The oil reservoir is located at the end of the central shaft and a fixing bolt is threaded into the oil reservoir. The fixing bolt is adapted to fix the crank.

[0011] Optionally, a fluororubber plug is fixedly connected to the end of the oil storage tank by the fixing bolt, and the fluororubber plug is interference-fitted with the oil storage tank; the fluororubber plugs are spaced apart from the bottom of the oil storage tank.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0013] 1. The oil outlet channel is a micropore. The lubricating oil itself has a certain viscosity. When the bicycle is not being ridden, the bottom bracket is in a stationary state. The lubricating oil will form tension at the outlet of the oil outlet channel, and the tension is greater than the gravity. Therefore, the lubricating oil will not seep out from the oil outlet channel. However, during riding, the bottom bracket is in a rotating state. The lubricating oil in the oil reservoir will break through the tension under the action of centrifugal force, seep out from the oil outlet channel and be absorbed by the oil-absorbing cotton to lubricate the rotating bearing and the contact point between the rotating bearing and the bottom bracket, thus playing a self-lubricating role. In addition, the lubricating oil stored in the oil reservoir can play a lubricating role for a long time, reducing the frequency of bottom bracket lubrication maintenance.

[0014] 2. When lubricating oil needs to be added, simply remove the fixing bolts; there is no need to remove the end cover and rotating bearing, which improves the convenience of lubrication and maintenance.

[0015] 3. The fluororubber ring can seal the side of the oil-absorbing cotton near the central shaft sleeve, so that as much lubricating oil as possible on the oil-absorbing cotton can be applied to the rotating bearing. At the same time, it can also support the oil-absorbing cotton and keep the oil-absorbing cotton in a ring structure.

[0016] 4. The ceramic ring has high wear resistance. The inner circumferential wall of the ceramic ring contacts the outer circumferential wall of the central shaft core, which can not only ensure the sealing of the oil-absorbing cotton near the central shaft sleeve, but also make the fluororubber ring less prone to wear and improve its service life.

[0017] 5. The oil outlet channel is located on the side of the rotating bearing near the central shaft sleeve. After the rotating bearing and the central shaft core are connected by insertion, a sealing structure can be formed. At the same time, the oil-absorbing cotton can form a filter barrier, making it difficult for external dust particles to clog the oil outlet channel.

[0018] 6. The grease is filled into the spiral grooves, which can effectively prevent the grease from accumulating in one place in the central shaft sleeve as it rotates. Multiple spiral grooves can make the grease distribution more even, ensuring the lubrication of the central shaft core and central shaft sleeve when they rotate.

[0019] In addition, this utility model provides a bicycle, including the self-lubricating bottom bracket as described above.

[0020] Compared to existing technologies, the bicycle described in this utility model has the same advantages as the self-lubricating bottom bracket mentioned above, which will not be repeated here. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the central shaft in an embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional view of the central axis in an embodiment of this utility model;

[0023] Figure 3 This is a partial sectional view of the central axis in an embodiment of this utility model;

[0024] Figure 4 This is an exploded view of the end cap, rotating bearing, oil-absorbing cotton, and fluororubber ring in an embodiment of this utility model.

[0025] Figure 5 This is an exploded view of the central axis in an embodiment of this utility model.

[0026] Explanation of reference numerals in the attached drawings: 1. Central shaft sleeve; 2. Central shaft core; 21. Oil reservoir; 211. Oil outlet channel; 22. Fixing bolt; 23. Fluororubber plug; 24. Spiral groove; 3. End cap; 31. Rotary bearing; 32. Oil-absorbing cotton; 33. Fluororubber ring; 331. Mounting ring groove; 34. Ceramic ring. Detailed Implementation

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figure 1-5 This application will be described in further detail.

[0028] In a first aspect, embodiments of this utility model provide a self-lubricating central shaft, referring to... Figure 1 and Figure 2 The self-lubricating bottom bracket includes a bottom bracket sleeve 1, a bottom bracket core 2, and end caps 3. Two end caps 3 are provided, located at opposite ends of the bottom bracket sleeve 1, and both end caps 3 are fitted and inserted into the bottom bracket sleeve 1. The bottom bracket sleeve 1 is inserted into the frame, and the two end caps 3 are threaded into the frame and clamp the bottom bracket sleeve 1. Each end cap 3 contains a rotating bearing 31. The bottom bracket sleeve 1, end caps 3, and rotating bearings 31 are all fitted onto the bottom bracket core 2; the rotating bearings 31 and the bottom bracket sleeve 1 are rotatably connected to the bottom bracket core 2. The two ends of the bottom bracket core 2 extend through the two end caps 3 in a cantilevered configuration. The cranks connected to the pedals are fitted onto the cantilevered portions of the bottom bracket core 2 and rotate synchronously with it. Both ends of the central shaft core 2 are provided with oil storage grooves 21, which contain lubricating oil; each end cover 3 is provided with oil-absorbing cotton 32, and the lubricating oil in the oil storage groove 21 can flow into the oil-absorbing cotton 32 as the central shaft core 2 rotates, so that the oil-absorbing cotton 32 can lubricate the rotating bearing 31.

[0029] Since the two end caps 3 and the two oil reservoirs 21 have the same structure, the following explanation will take the matching structure of one end cap 3 and the oil reservoir 21 as an example.

[0030] Reference Figure 2 and Figure 3 Both ends of the central shaft core 2 are square prisms, allowing the crank to rotate synchronously with the central shaft core 2 after being fitted onto the square prisms. A fixing bolt 22 is inserted into and threadedly connected to the oil reservoir 21. The outer diameter of the head of the fixing bolt 22 (the driving end that mates with a wrench) is larger than the outer diameter of the central shaft core 2. A countersunk hole is provided on the crank, allowing the head of the fixing bolt 22 to be inserted into the larger hole in the countersunk hole of the crank, thus fixing the crank to the central shaft core 2 and enabling synchronous rotation. To add lubricating oil, simply remove the fixing bolt 22 and inject lubricating oil into the oil reservoir 21. Because the lubricating oil remains in the oil reservoir 21 for extended periods, the walls of the oil reservoir 21, the fixing bolt 22, and the entire central shaft core 2 are all coated with a highly corrosion-resistant paint.

[0031] A fluororubber plug 23 is provided at one end of the fixing bolt 22 located in the oil reservoir 21. A countersunk hole is formed on the side of the fluororubber plug 23 away from the fixing bolt 22, penetrating the plug and into which an internal hexagon bolt is inserted. A threaded groove is formed on the side of the fixing bolt 22 near the fluororubber plug 23, and the internal hexagon bolt is threaded into the groove, thus fixing the fluororubber plug 23 to the fixing bolt 22. The fluororubber plug 23 is interference-fitted with the oil reservoir 21, and the fluororubber plugs 23 and the bottom of the reservoir 21 are spaced apart. Lubricating oil is located between the fluororubber plug 23 and the bottom of the reservoir. The fluororubber plug 23 acts as a seal, preventing lubricating oil from leaking out of the reservoir 21. Simultaneously, fluororubber itself has high corrosion resistance, so the fluororubber plug 23 is not prone to cracking or failure after prolonged contact with lubricating oil, maintaining high sealing performance.

[0032] Reference Figure 2 and Figure 3 The oil reservoir 21 has an oil outlet channel 211 on its wall, which extends through the central axle core 2 along its opening direction. The inner diameter of the oil outlet channel 211 is 0.3mm-1.2mm. Since the lubricating oil has a certain viscosity, in this embodiment, the inner diameter of the oil outlet channel 211 is preferably 0.5mm. The higher the viscosity of the lubricating oil, the larger the inner diameter of the oil outlet channel 211 will be. When the central axle core 2 is stationary and not rotating, the lubricating oil will form tension at the outlet of the oil outlet channel 211, and the tension is greater than the gravity, so the lubricating oil will not seep out from the oil outlet channel 211. However, during riding, the central axle core 2 rotates, and the lubricating oil will be subjected to centrifugal force. The centrifugal force will break the balance between the tension and gravity of the lubricating oil, causing the lubricating oil to slowly seep out from the oil outlet channel 211, thereby achieving a self-lubricating effect. In this embodiment, two oil outlet channels 211 are preferably evenly spaced.

[0033] The socket head cap screw does not protrude from the countersunk hole on the fluororubber plug 23, and a fluororubber plug (not shown in the figure) is inserted into the countersunk hole to block it. This makes it difficult for the socket head cap screw to come into contact with the lubricating oil, and it rusts in the lubricating oil over a long period of time, causing the rust to fall off and block the oil outlet channel 211.

[0034] Reference Figure 2 and Figure 3 The end cap 3 has a first groove on one side, into which the central shaft sleeve 1 and the rotating bearing 31 are inserted, with the rotating bearing 31 abutting against the bottom of the first groove. A second groove is formed at the bottom of the first groove, with a groove diameter equal to the inner diameter of the rotating bearing 31. The second groove penetrates the end cap 3, and the central shaft core 2 passes through the second groove. In this way, the end cap 3 provides a seal for the rotating bearing 31, preventing dust from easily entering the first groove and adhering to the rotating bearing 31.

[0035] Reference Figure 3 and Figure 4 The oil outlet channel 211 is located on the side of the rotating bearing 31 near the central shaft sleeve 1. The oil-absorbing cotton 32 is annular and is fitted onto the central shaft core 2. The oil-absorbing cotton 32 is a single piece, not multiple pieces joined together, thus preventing it from loosening and tangling when the central shaft core 2 rotates. The oil-absorbing cotton 32 is located at the outlet of the oil outlet channel 211 and blocks its exit. The inner circumferential wall of the oil-absorbing cotton 32 is in contact with the outer circumferential wall of the central shaft core 2. The oil-absorbing cotton 32 is inserted between the inner and outer rings of the rotating bearing 31 and contacts the balls. Therefore, lubricating oil discharged through the oil outlet channel 211 is absorbed by the oil-absorbing cotton 32. During the rotation of the rotating bearing 31, the balls are lubricated after contacting the oil-absorbing cotton 32. Additionally, the lubricating oil on the oil-absorbing cotton 32 can also seep into the space between the rotating bearing 31 and the central shaft core 2 for lubrication. After the rotating bearing 31 is inserted and connected to the central shaft core 2, a sealing structure can be formed. At the same time, the oil-absorbing cotton 32 can form a filter barrier, making it difficult for external dust particles to clog the oil outlet channel 211.

[0036] Because the oil-absorbing cotton 32 blocks the outlet of the oil outlet channel 211, when the central shaft is in a stationary state, the tension of the lubricating oil can be balanced with gravity in a short time, so that the lubricating oil does not drip out of the outlet of the oil outlet channel 211.

[0037] Reference Figure 3 and Figure 4 A fluororubber ring 33 is provided between the oil-absorbing cotton 32 and the central shaft sleeve 1. The fluororubber ring 33 is sleeved on the central shaft core 2, and its outer peripheral wall abuts against the groove wall of the first groove. A mounting ring groove 331 is provided on the side of the fluororubber ring 33 near the rotating bearing 31. The mounting ring groove 331 communicates with the inner hole of the fluororubber ring 33, that is, it communicates with the oil outlet channel 211. The oil-absorbing cotton 32 is interference-fitted into the mounting ring groove 331, and the fluororubber ring 33 provides support for the oil-absorbing cotton 32, allowing it to maintain its annular structure. Because the oil-absorbing cotton 32 is interference-fitted into the mounting ring groove 331, even after the inner ring of the oil-absorbing cotton 32 is worn, the oil-absorbing cotton 32 can still maintain its fit with the central shaft core 2 due to its own deformation capacity, ensuring the oil-absorbing effect of the oil-absorbing cotton 32.

[0038] When the end cap 3 is tightened on the frame and installed in place, the oil-absorbing cotton 32 and the fluororubber ring 33 will be squeezed by the rotating bearing 31 and the central shaft sleeve 1. However, the oil-absorbing cotton 32 is still in a loose state, that is, the oil-absorbing cotton 32 can still be squeezed and deformed. This allows the oil-absorbing cotton 32 to absorb the lubricating oil and be better wetted by the lubricating oil, so that the entire oil-absorbing cotton 32 is wetted.

[0039] Reference Figure 3 and Figure 4The inner wall of the fluororubber ring 33 has an insertion groove, and a ceramic ring 34 is placed in the insertion groove. The ceramic ring 34 is sleeved on the central shaft core 2, and the inner circumferential wall of the ceramic ring 34 contacts the outer circumferential wall of the central shaft core 2. The fluororubber ring 33 can seal the side of the oil-absorbing cotton 32 near the central shaft sleeve 1, so that the lubricating oil on the oil-absorbing cotton 32 can be applied to the rotating bearing 31 as much as possible. The ceramic ring 34 has high wear resistance. The contact between the inner circumferential wall of the ceramic ring 34 and the outer circumferential wall of the central shaft core 2 can not only ensure the sealing of the side of the oil-absorbing cotton 32 near the central shaft sleeve 1, but also prevent the fluororubber ring 33 from being worn, thus improving its service life.

[0040] Reference Figures 3 to 5 The outer wall of the central shaft core 2 has spiral grooves 24 located between two oil outlet channels 211. Multiple spiral grooves 24 are spaced circumferentially on the outer wall of the central shaft core 2, and each spiral groove 24 is coated with grease. The grease filling the spiral grooves 24 effectively prevents grease from accumulating in one place within the central shaft sleeve 1 during rotation. The multiple spiral grooves 24 ensure a relatively uniform distribution of grease, guaranteeing lubrication between the central shaft core 2 and the central shaft sleeve 1 during rotation. Furthermore, when the lubricating oil on the oil-absorbing cotton 32 reaches saturation, the lubricating oil seeps from between the ceramic ring 34 and the central shaft core 2 into the spiral grooves 24, thereby improving the lubrication between the central shaft core 2 and the central shaft sleeve 1.

[0041] It is worth noting that the noise generated by the sloshing of the lubricating oil during riding is much less than the noise from the chain drive system and tire friction, so it can be ignored, ensuring riding comfort.

[0042] The implementation principle of a self-lubricating bottom bracket in this embodiment is as follows: the oil outlet channel 211 is a micropore, and the lubricating oil itself has a certain viscosity. When the bicycle is not being ridden, the bottom bracket core 2 is in a static state, and the lubricating oil will form tension at the outlet of the oil outlet channel 211. The tension is greater than the gravity, so the lubricating oil will not seep out from the oil outlet channel 211. During riding, the bottom bracket core 2 is in a rotating state, and the lubricating oil in the oil reservoir 21 will break through the tension under the action of centrifugal force, seep out from the oil outlet channel 211, and be absorbed by the oil-absorbing cotton 32 to lubricate the rotating bearing 31 and the contact area between the rotating bearing 31 and the bottom bracket core 2, thus playing a self-lubricating role. When the lubricating oil on the oil-absorbing cotton 32 reaches a saturated state, the lubricating oil will seep from between the ceramic ring 34 and the bottom bracket core 2 into the spiral groove 24, thereby improving the lubrication between the bottom bracket core 2 and the bottom bracket sleeve 1.

[0043] The micropores in the oil outlet channel 211 allow the lubricating oil to drain slowly, ensuring long-term lubrication and reducing the frequency of lubrication maintenance on the central shaft. When lubricating oil needs to be added, simply remove the fixing bolt 22; there is no need to remove the end cover 3 and the rotating bearing 31, improving the convenience of lubrication maintenance.

[0044] Secondly, another embodiment of the present invention provides a bicycle including the self-lubricating bottom bracket described in the first aspect.

[0045] Similarly, the components included in the "components," "mechanisms," and "devices" of this disclosure can also be flexibly combined. They can be modularly produced according to actual needs and assembled as an independent module; or they can be assembled separately to form a module in this device. The division of the above-mentioned components in this disclosure is only one embodiment for ease of reading and is not intended to limit the scope of protection of this disclosure. Any technical solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this disclosure.

[0046] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure 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. Therefore, they should not be construed as limitations on this disclosure.

[0047] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0049] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is considered to be "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0051] 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.

[0052] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, 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 inventive concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.

Claims

1. A self-lubricating central shaft, characterized in that: The axle assembly includes a central axle sleeve (1), a central axle core (2), and an end cap (3). The end cap (3) is located at the end of the central axle sleeve (1) and is inserted into the central axle sleeve (1). The end cap (3) is adapted to be threaded into the frame, and a rotating bearing (31) is provided inside the end cap (3). The central axle sleeve (1), the end cap (3), and the rotating bearing (31) are all fitted onto the central axle core (2), and the rotating bearing (31) and the central axle sleeve (1) are rotatably connected to the central axle core (2). An oil reservoir (21) is provided on the central axle core (2), and the oil reservoir (21) contains lubricating oil. An oil-absorbing cotton (32) is provided on one side of the rotating bearing (31). The oil storage tank (21) has an oil outlet channel (211) on its wall, which passes through the central shaft (2). The oil-absorbing cotton (32) is located at the outlet of the oil outlet channel (211) and is in contact with the rotating bearing (31). The inner diameter of the oil outlet channel (211) is 0.3mm-1.2mm. When the central shaft (2) is stationary, the tension of the lubricating oil at the outlet of the oil outlet channel (211) is greater than the gravity, making it difficult for the lubricating oil to flow out. When the central shaft (2) rotates, the lubricating oil slowly seeps into the oil-absorbing cotton (32) through the oil outlet channel (211) to lubricate the rotating bearing (31).

2. The self-lubricating central shaft according to claim 1, characterized in that: The oil outlet channel (211) is located on the side of the rotating bearing (31) near the central shaft sleeve (1).

3. The self-lubricating central shaft according to claim 1, characterized in that: The outer wall of the central core (2) is provided with a spiral groove (24), and multiple spiral grooves (24) are spaced apart circumferentially on the outer peripheral wall of the central core (2), and each spiral groove (24) is coated with grease.

4. The self-lubricating central shaft according to claim 1, characterized in that: The oil-absorbing cotton (32) is ring-shaped.

5. The self-lubricating central shaft according to any one of claims 1-4, characterized in that: A fluororubber ring (33) is provided between the rotating bearing (31) and the central shaft sleeve (1). The fluororubber ring (33) has an installation ring groove (331) on the side near the rotating bearing (31). The installation ring groove (331) is connected to the oil outlet channel (211). The oil-absorbing cotton (32) is located in the installation ring groove (331).

6. The self-lubricating central shaft according to claim 5, characterized in that: The inner wall of the fluororubber ring (33) is provided with a plug-in ring groove, and a ceramic ring (34) is provided in the plug-in ring groove. The ceramic ring (34) is sleeved on the central core (2), and the inner peripheral wall of the ceramic ring (34) is in contact with the outer peripheral wall of the central core (2).

7. The self-lubricating central shaft according to claim 5, characterized in that: The end of the central shaft (2) extends through the end cap (3) and is suspended. The oil reservoir (21) is opened at the end of the central shaft (2). A fixing bolt (22) is threaded in the oil reservoir (21) and is suitable for fixing the crank.

8. The self-lubricating central shaft according to claim 7, characterized in that: The fixing bolt (22) is fixedly connected to a fluororubber plug (23) at the end of the oil storage tank (21). The fluororubber plug (23) is interference-fitted with the oil storage tank (21). The fluororubber plug (23) is arranged at intervals with the bottom of the oil storage tank (21).

9. A bicycle, characterized in that, Includes the self-lubricating central shaft as described in any one of claims 1-8.

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