Bicycle center shaft sealing structure

Abstract

The invention discloses a bicycle center shaft sealing structure, which belongs to the technical field of sealing center shafts, and comprises a crank connecting shaft, the outer walls of the two ends of the crank connecting shaft are sleeved with rotating shaft bodies, the outer walls of the rotating shaft bodies on the two sides are sleeved with sealing bearings, and the outer wall of the sealing bearing on one side is fixedly connected with a first adjusting shaft sleeve; a first adjusting shaft sleeve is fixedly connected to the outer wall of the sealing bearing on one side, a second adjusting shaft sleeve is fixedly connected to the outer wall of the sealing bearing on the other side, and adjusting assemblies are installed on the first adjusting shaft sleeve and the second adjusting shaft sleeve. The relative distance between the first adjusting shaft sleeve and the second adjusting shaft sleeve can be adjusted by matching with sealing bearings arranged on the inner walls of the first adjusting shaft sleeve and the second adjusting shaft sleeve, and the threaded end of a fixing screw damages the external threaded pipe by screwing the fixing screw. The positions of the second adjusting shaft sleeve and the first adjusting shaft sleeve are fixed.

Description

Technical Field

[0001] The invention belongs to the technical field of sealed middle shafts, and in particular relates to a sealing structure of a bicycle middle shaft. Background Art

[0002] Bicycles are divided into front axles, middle axles and rear axles. The middle axle of a bicycle is the axle connected to the pedals, and the rear axle is the axle of the rear wheel. The two axles are connected by a chain. The middle axle generates power and transmits it to the rear axle through the chain. The rear axle drives the rear wheel to rotate and generates driving force for forward movement. The sealed middle axle is a type of bicycle middle axle. Compared with the traditional ball bearing middle axle, the sealed middle axle has an additional waterproof rubber ring, which has a better sealing and waterproof effect. As in the prior art, Chinese patent CN220315228U discloses an easily detachable bicycle sealed middle shaft, comprising: an axle body, both left and right ends of the axle body are connected with connecting pins, and a sealing block is fixedly connected to one end of the connecting pin away from the vertical center line of the axle body, a bearing is arranged on the outer side of the axle body, and a shaft sleeve is fixedly connected between the monomers of the bearing, and the axle body comprises a mounting section, a connecting section, a connecting hole and a limiting hole; a first bowl sleeve, which is connected to the outer side of the bearing, a second bowl sleeve is arranged on the right side of the first bowl sleeve, and a connecting ring is fixedly connected to the inner surface of the second bowl sleeve; a crank frame body, which is connected to the outer side of the axle body, a mounting hole is opened inside the crank frame body, and a connecting hole is opened at the rear end of the crank frame body. The easily detachable bicycle sealed middle shaft solves the problems that the existing bicycle sealed middle shaft is not easy to disassemble and assemble, has low connection stability, is easy to loosen and fall off, and is mostly difficult to replace the bowl sleeve.

[0003] Although the above-mentioned prior art can more conveniently disassemble the sealed middle shaft, the existing sealed middle shafts are mostly divided into two types: 68mm and 73mm. When the user purchases the middle shaft by himself, if the size purchased deviates, it cannot be installed, and the fixed middle shaft size limits the design of the bicycle frame. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In order to solve the problem that the sealed middle shaft mentioned in the above background technology is mostly divided into two types, 68mm and 73mm, and when the user purchases the middle shaft by himself, if the purchased size deviates, it cannot be installed, and the fixed middle shaft size limits the design of the bicycle frame, the present invention adopts the following technical solution.

[0006] A bicycle middle shaft sealing structure comprises a crank connecting shaft, wherein the outer walls at both ends of the crank connecting shaft are sleeved with rotating shaft bodies, the outer walls of the rotating shaft bodies on both sides are sleeved with sealed bearings, the outer wall of the sealed bearing on one side is fixedly connected with a first adjusting sleeve, and the outer wall of the sealed bearing on the other side is fixedly connected with a second adjusting sleeve, an adjusting assembly is installed on the first adjusting sleeve and the second adjusting sleeve, the adjusting assembly adjusts the distance between the first adjusting sleeve and the second adjusting sleeve, a limiting assembly is installed on the first adjusting sleeve and the second adjusting sleeve, and the limiting assembly fixes the first adjusting sleeve and the second adjusting sleeve after the distance is adjusted.

[0007] Preferably, the outer wall of the second adjusting sleeve is provided with a threaded hole, the inner thread of the threaded hole is connected with a fixing screw, and the threaded end of the fixing screw contacts the external threaded tube.

[0008] Preferably, the crank connecting shaft includes a right connecting shaft and a left connecting shaft, the rotating shaft body includes a left shaft body and a right shaft body, the right connecting shaft passes through the right shaft body, the left connecting shaft passes through the left shaft body, one end of the left connecting shaft passing through the left shaft body is fixedly connected with a connecting sleeve shaft, and the connecting sleeve shaft is slidably connected to one end of the right connecting shaft passing through the right shaft body.

[0009] Preferably, the inner wall of the connecting sleeve shaft is fixedly connected with a plurality of sliding protrusions, the outer wall of the right connecting shaft passing through the right shaft body is provided with a plurality of limiting sliding grooves, and the sliding protrusions are slidably connected with the inside of the limiting sliding grooves.

[0010] Preferably, a plurality of first limit sliding rods are fixedly connected to the outer walls of the opposite surfaces of the right shaft body and the left shaft body, and a plurality of first limit sliding holes are provided on the opposite surfaces of the left shaft body and the right shaft body, and each first limit sliding rod is inserted into the interior of the first limit sliding hole.

[0011] Preferably, the adjustment assembly includes an external threaded tube and an internal threaded groove, the first adjustment sleeve is fixedly connected to one end thereof close to the second adjustment sleeve with the external threaded tube, the inner wall of the second adjustment sleeve is provided with an internal threaded groove, and the external threaded tube is threadedly connected to the internal threaded groove.

[0012] Preferably, the limiting assembly comprises a second limiting sliding hole and a second limiting sliding rod, the second limiting sliding holes are arranged at opposite ends of the second adjustment sleeve and the first adjustment sleeve, and the second limiting sliding rod is slidably connected inside the second limiting sliding hole.

[0013] Preferably, adsorption magnets are installed on the deepest inner walls of the second limiting sliding holes on both sides.

[0014] Preferably, inner grooves are provided at both ends of the crank connecting shaft, pedal cranks are installed on the outer walls at both ends of the crank connecting shaft, the second adjusting sleeve is fixedly connected to the outer wall away from the first adjusting sleeve with a sealing flange, and the sealing flange is fixedly connected to the outer wall close to the first adjusting sleeve with a connecting thread head.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The relative distance between the first adjusting sleeve and the second adjusting sleeve can be adjusted by rotating the first adjusting sleeve or the second adjusting sleeve of the adjusting assembly and cooperating with the sealed bearing arranged on the inner wall of the first adjusting sleeve and the second adjusting sleeve.

[0016] 2. By tightening the set screw, the threaded end of the set screw destroys the external threaded tube, so that the positions of the second adjustment sleeve and the first adjustment sleeve are fixed.

[0017] 3. By setting the sliding connection between the connecting sleeve shaft and the right connecting shaft, the first adjusting sleeve and the second adjusting sleeve can be adaptively extended or shortened when adjusting the spacing, so that the crank connecting shaft can extend to the same length on both sides when adjusting the length of the middle shaft, thereby not affecting the installation of the pedal crank.

[0018] 4. By inserting the sliding protrusion into the interior of the limit sliding groove, the connection strength between the connecting sleeve shaft, the left connecting shaft and the right connecting shaft is higher, and the transmission effect is better.

[0019] 5. By inserting the first limit sliding rod into the first limit sliding hole, the first limit sliding rod slides inside the first limit sliding hole when the first adjustment sleeve and the second adjustment sleeve are adjusting the spacing, thereby further increasing the strength of the central axis, and further increasing the stability of the transmission, avoiding deformation between the connecting sleeve shaft and the right connecting shaft.

[0020] 6. After adjusting the distance between the first adjusting sleeve and the second adjusting sleeve, slide the second limit sliding rod outward from the inside of the second limit sliding hole on the second adjusting sleeve and insert it into the inside of the second limit sliding hole on the first adjusting sleeve, so that the first adjusting sleeve and the second adjusting sleeve will not rotate when the middle shaft is connected to the bicycle, so that the middle shaft can be installed more conveniently, and the second limit sliding hole can be adsorbed by the setting of the adsorption magnet, so that it can remain fixed whether it is in the limited state or not. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a bicycle middle shaft sealing structure in the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the first sleeve and the second sleeve in the present invention; Figure 3 It is a schematic diagram of the sliding structure of the left connecting shaft and the right connecting shaft in the present invention; Figure 4 It is a schematic diagram of the sliding structure of the sliding protrusion block and the internal sliding groove of the limiting sliding groove in the present invention; Figure 5 It is a schematic diagram of the structure of the limit sliding rod in the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the left shaft body and the right shaft body in the present invention.

[0022] The corresponding relationship between the illustrations and component names in the figure is as follows: 100, crank connecting shaft; 1001, right connecting shaft; 1002, left connecting shaft; 101, sealed bearing; 102, rotating shaft; 1021, left shaft; 1022, right shaft; 103, connecting sleeve shaft; 104, sliding protrusion block; 105, limiting sliding groove; 106, first limit sliding hole; 107, first limit sliding rod; 108, second limit sliding hole; 109. A second limit sliding rod; 110. An adsorption magnet; 200, first adjusting sleeve; 201, second adjusting sleeve; 202, sealing flange; 203, connecting thread head; 204, external threaded pipe; 205, internal thread groove; 206, fixing screw. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0026] like Figure 1As shown, it is a schematic diagram of a bicycle middle shaft sealing structure according to a preferred embodiment of the present invention. The bicycle middle shaft sealing structure of this embodiment includes a crank connecting shaft 100, and the outer walls of both ends of the crank connecting shaft 100 are sleeved with rotating shaft bodies 102, and the outer walls of the rotating shaft bodies 102 on both sides are sleeved with sealed bearings 101, and the outer wall of the sealed bearing 101 on one side is fixedly connected with a first adjusting sleeve 200, and the outer wall of the sealed bearing 101 on the other side is fixedly connected with a second adjusting sleeve 201, and the first adjusting sleeve 200 and the second adjusting sleeve 201 move relative to each other, and the crank connecting shaft 100 is adaptively extended and retracted according to the movement of the first adjusting sleeve 200 and the second adjusting sleeve 201, and the second adjusting sleeve 201 is away from the first adjusting sleeve 200. A sealing flange 202 is fixedly connected to the outer wall, and a connecting threaded head 203 is fixedly connected to the outer wall of the sealing flange 202 near the first adjusting sleeve 200. Inner grooves are provided at both ends of the crank connecting shaft 100, and pedal cranks are installed on the outer walls of both ends of the crank connecting shaft 100. In this embodiment, the bicycle pedal crank is connected through the crank connecting shaft 100, and the length of the middle shaft can be adjusted through the relative movement of the first adjusting sleeve 200 and the second adjusting sleeve 201, and the adaptive telescopic extension of the crank connecting shaft 100 makes it possible to not affect the transmission effect of the pedal after the length is adjusted, so that it is not limited to the existing fixed size, and the length can be adjusted according to actual needs, so that it has a better adaptation effect, and it can be connected to the bicycle through the connecting threaded head 203.

[0027] like Figure 2 As shown, it is a schematic diagram of the cross-sectional structure of the first sleeve and the second sleeve in this embodiment, the first adjusting sleeve 200 is fixedly connected to one end close to the second adjusting sleeve 201 with an external threaded tube 204, the inner wall of the second adjusting sleeve 201 is provided with an internal threaded groove 205, the external threaded tube 204 is threadedly connected with the internal threaded groove 205, in this embodiment, by rotating the first adjusting sleeve 200 or the second adjusting sleeve 201, the sealing bearing 101 provided on the inner wall of the first adjusting sleeve 200 and the second adjusting sleeve 201 can adjust the relative distance between the first adjusting sleeve 200 and the second adjusting sleeve 201.

[0028] It is worth noting that the above-mentioned external threaded tube 204 and internal threaded groove 205 are the adjustment components in this embodiment, and the adjustment components include but are not limited to the external threaded tube 204 and the internal threaded groove 205. As long as it is a component that can make the first adjustment sleeve 200 and the second adjustment sleeve 201 move relative to each other, it can be applied to this embodiment.

[0029] like Figure 2As shown, in order to be able to fix the middle axis after the length is adjusted, in this embodiment, the outer wall of the second adjusting sleeve 201 is provided with a threaded hole, and the internal thread of the threaded hole is connected with a fixing screw 206, and the threaded end of the fixing screw 206 contacts the external threaded tube 204. In this embodiment, the threaded end of the fixing screw 206 destroys the external threaded tube 204 by tightening the fixing screw 206, so that the position of the second adjusting sleeve 201 and the first adjusting sleeve 200 is fixed. It is worth noting that if the length of the middle axis needs to be adjusted later, there is no need to screw in the fixing screw 206.

[0030] like Figure 3 As shown, it is a schematic diagram of the sliding structure of the left connecting shaft and the right connecting shaft in this embodiment, the crank connecting shaft 100 includes a right connecting shaft 1001 and a left connecting shaft 1002, the rotating shaft body 102 includes a left shaft body 1021 and a right shaft body 1022, the right connecting shaft 1001 passes through the right shaft body 1022, the left connecting shaft 1002 passes through the left shaft body 1021, and one end of the left connecting shaft 1002 passing through the left shaft body 1021 is fixedly connected with a connecting sleeve shaft 103, and the connecting sleeve shaft 103 is slidingly connected to one end of the right connecting shaft 1001 passing through the right shaft body 1022. In this embodiment, through the sliding connection between the connecting sleeve shaft 103 and the right connecting shaft 1001, the first adjusting shaft sleeve 200 and the second adjusting shaft sleeve 201 can be adaptively extended or shortened when adjusting the spacing, so that the crank connecting shaft 100 can have the same protruding length on both sides when the middle axis is adjusted in length, thereby not affecting the installation of the pedal crank.

[0031] like Figure 4 As shown, it is a schematic diagram of the sliding structure of the sliding protrusion block and the internal sliding groove in this embodiment, the inner wall of the connecting sleeve shaft 103 is fixedly connected with multiple sliding protrusion blocks 104, the outer wall of the right connecting shaft 1001 passing through the right shaft body 1022 is provided with multiple limiting sliding grooves 105, the sliding protrusion block 104 is connected to the internal sliding of the limiting sliding groove 105, in this embodiment, by inserting the sliding protrusion block 104 into the limiting sliding groove 105, the connection strength between the connecting sleeve shaft 103, the left connecting shaft 1002 and the right connecting shaft 1001 is higher, and the transmission effect is better.

[0032] like Figure 4 as well as Figure 5As shown, it is a schematic diagram of the sliding structure of the sliding protrusion block and the internal sliding groove and the schematic diagram of the limiting sliding rod structure in this embodiment. The outer walls of the opposite surfaces of the right shaft body 1022 and the left shaft body 1021 are fixedly connected with multiple first limiting sliding rods 107, and the opposite surfaces of the left shaft body 1021 and the right shaft body 1022 are provided with multiple first limiting sliding holes 106, and each first limiting sliding rod 107 is inserted into the first limiting sliding hole 106. In this embodiment, the first limiting sliding rod 107 is inserted into the first limiting sliding hole 106, so that the first adjusting sleeve 200 and the second adjusting sleeve 201 adjust the spacing. The first limiting sliding rod 107 slides inside the first limiting sliding hole 106, thereby further increasing the strength of the central axis, and can also further increase the stability of the transmission, and avoid deformation between the connecting sleeve shaft 103 and the right connecting shaft 1001.

[0033] like Figure 6 As shown, it is a schematic diagram of the cross-sectional structure of the left shaft body and the right shaft body in this embodiment, the second adjusting sleeve 201 and the opposite ends of the first adjusting sleeve 200 are provided with a second limit sliding hole 108, and the second limit sliding hole 108 is internally slidably connected with a second limit sliding rod 109. In this embodiment, after the spacing between the first adjusting sleeve 200 and the second adjusting sleeve 201 is adjusted, the second limit sliding rod 109 is slid outward from the inside of the second limit sliding hole 108 on the second adjusting sleeve 201 and inserted into the inside of the second limit sliding hole 108 on the first adjusting sleeve 200, so that the first adjusting sleeve 200 and the second adjusting sleeve 201 will not rotate when the middle shaft is connected to the bicycle, so that the middle shaft can be installed more conveniently.

[0034] It is worth noting that the above-mentioned second limiting sliding hole 108 and the second limiting sliding rod 109 are the limiting components in this embodiment, and the limiting components include but are not limited to the second limiting sliding hole 108 and the second limiting sliding rod 109. As long as it is a component that can fix the first adjustment sleeve 200 and the second adjustment sleeve 201 to each other, it can be applied to this embodiment.

[0035] like Figure 6 As shown, in order to avoid the second limit sliding hole 108 from resetting during installation, in this embodiment, adsorption magnets 110 are installed on the deepest inner walls of the second limit sliding holes 108 on both sides. In this embodiment, the second limit sliding hole 108 can be adsorbed by the setting of the adsorption magnets 110, so that it can remain fixed regardless of whether it is in the limit state or not.

[0036] In summary, the specific use of this embodiment is as follows: By rotating the first adjusting sleeve 200 or the second adjusting sleeve 201, the relative distance between the first adjusting sleeve 200 and the second adjusting sleeve 201 can be adjusted in cooperation with the sealed bearing 101 arranged on the inner wall of the first adjusting sleeve 200 and the second adjusting sleeve 201. By tightening the fixing screw 206, the threaded end of the fixing screw 206 destroys the external threaded tube 204, so that the position of the second adjusting sleeve 201 and the first adjusting sleeve 200 is fixed. It is worth noting that if the length of the middle shaft needs to be adjusted later, it is not necessary to tighten the fixing screw 206. The fixing screw 206 is inserted, and the sliding connection between the connecting sleeve shaft 103 and the right connecting shaft 1001 is made so that the first adjusting sleeve 200 and the second adjusting sleeve 201 can be adaptively extended or shortened when adjusting the spacing, so that the crank connecting shaft 100 can be extended to the same length on both sides when the length of the middle shaft is adjusted, thereby not affecting the installation of the pedal crank. The sliding protrusion 104 is inserted into the interior of the limiting sliding groove 105, so that the connection between the connecting sleeve shaft 103, the left connecting shaft 1002 and the right connecting shaft 1001 is strengthened. The degree of rigidity is higher and the transmission effect is better. The first limiting sliding rod 107 is inserted into the first limiting sliding hole 106, so that the first limiting sliding rod 107 slides inside the first limiting sliding hole 106 when the first adjusting sleeve 200 and the second adjusting sleeve 201 adjust the spacing, thereby further increasing the strength of the middle shaft, and further increasing the stability of the transmission, avoiding deformation between the connecting sleeve shaft 103 and the right connecting shaft 1001. After the spacing between the first adjusting sleeve 200 and the second adjusting sleeve 201 is adjusted, the second limiting sliding rod 109 is slid outward from the inside of the second limiting sliding hole 108 on the second adjusting sleeve 201 and inserted into the inside of the second limiting sliding hole 108 on the first adjusting sleeve 200, so that the first adjusting sleeve 200 and the second adjusting sleeve 201 will not rotate when the middle shaft is connected to the bicycle, so that the middle shaft can be installed more conveniently. The second limiting sliding hole 108 can be adsorbed by the setting of the adsorption magnet 110, so that it can be kept fixed whether it is in a limited state or not in a limited state.

[0037] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A bicycle middle shaft sealing structure, comprising a crank connecting shaft (100), wherein the outer walls of both ends of the crank connecting shaft (100) are sleeved with rotating shaft bodies (102), and the outer walls of the rotating shaft bodies (102) on both sides are sleeved with sealed bearings (101), characterized in that: A first adjusting sleeve (200) is fixedly connected to the outer wall of the sealing bearing (101) on one side, and a second adjusting sleeve (201) is fixedly connected to the outer wall of the sealing bearing (101) on the other side. An adjusting assembly is installed on the first adjusting sleeve (200) and the second adjusting sleeve (201). The adjusting assembly adjusts the distance between the first adjusting sleeve (200) and the second adjusting sleeve (201). A limiting assembly is installed on the first adjusting sleeve (200) and the second adjusting sleeve (201). The limiting assembly allows the first adjusting sleeve (200) and the second adjusting sleeve (201) to be fixed after the distance is adjusted.

2. The bicycle middle shaft sealing structure according to claim 1, characterized in that: The outer wall of the second adjustment sleeve (201) is provided with a threaded hole, the inner thread of the threaded hole is connected with a fixing screw (206), and the threaded end of the fixing screw (206) contacts the external threaded tube (204).

3. The bicycle middle shaft sealing structure according to claim 1 or 2, characterized in that: The crank connecting shaft (100) comprises a right connecting shaft (1001) and a left connecting shaft (1002); the rotating shaft body (102) comprises a left shaft body (1021) and a right shaft body (1022); the right connecting shaft (1001) passes through the right shaft body (1022); the left connecting shaft (1002) passes through the left shaft body (1021); one end of the left connecting shaft (1002) passing through the left shaft body (1021) is fixedly connected to a connecting sleeve shaft (103); the connecting sleeve shaft (103) is slidably connected to one end of the right connecting shaft (1001) passing through the right shaft body (1022).

4. The bicycle middle shaft sealing structure according to claim 3, characterized in that: The inner wall of the connecting sleeve shaft (103) is fixedly connected with a plurality of sliding protrusions (104); the outer wall of the right connecting shaft (1001) passing through the right shaft body (1022) is provided with a plurality of limiting sliding grooves (105); the sliding protrusions (104) are slidably connected with the inside of the limiting sliding grooves (105).

5. The bicycle middle shaft sealing structure according to claim 4, characterized in that: A plurality of first position-limiting sliding rods (107) are fixedly connected to the outer walls of the opposite surfaces of the right shaft body (1022) and the left shaft body (1021), and a plurality of first position-limiting sliding holes (106) are provided on the opposite surfaces of the left shaft body (1021) and the right shaft body (1022), and each first position-limiting sliding rod (107) is inserted into the interior of the first position-limiting sliding hole (106).

6. The bicycle middle shaft sealing structure according to claim 5, characterized in that: The adjustment component comprises an external threaded tube (204) and an internal threaded groove (205); an end of the first adjustment sleeve (200) close to the second adjustment sleeve (201) is fixedly connected to the external threaded tube (204); an inner wall of the second adjustment sleeve (201) is provided with an internal threaded groove (205); and the external threaded tube (204) is threadedly connected to the internal threaded groove (205).

7. The bicycle middle shaft sealing structure according to claim 6, characterized in that: The limiting assembly comprises a second limiting sliding hole (108) and a second limiting sliding rod (109); the second limiting sliding hole (108) is provided at opposite ends of the second adjustment sleeve (201) and the first adjustment sleeve (200); and the second limiting sliding rod (109) is slidably connected inside the second limiting sliding hole (108).

8. The bicycle middle shaft sealing structure according to claim 7, characterized in that: Adsorption magnets (110) are installed on the deepest inner walls of the second limiting sliding holes (108) on both sides.

9. The bicycle middle shaft sealing structure according to claim 8, characterized in that: Inner grooves are provided at both ends of the crank connecting shaft (100), pedal cranks are mounted on the outer walls of both ends of the crank connecting shaft (100), a sealing flange (202) is fixedly connected to the outer wall of the second adjustment shaft sleeve (201) away from the first adjustment shaft sleeve (200), and a connecting thread head (203) is fixedly connected to the outer wall of the sealing flange (202) close to the first adjustment shaft sleeve (200).

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