Hub device and bicycle

Abstract

The utility model provides a hub device and a bicycle. The hub device comprises a connecting shaft, a tower footing assembly, a hub assembly and a ratchet wheel assembly. The connecting shaft comprises two sections which are oppositely arranged. The tower footing assembly is rotationally connected to one section of the connecting shaft and used for inputting power. The hub assembly is rotationally connected to the other section of the connecting shaft and used for outputting power. The ratchet wheel assembly comprises a first ratchet wheel and a second ratchet wheel which are oppositely arranged, the first ratchet wheel is connected to the tower footing assembly, and the second ratchet wheel is connected to the hub assembly. The first ratchet wheel comprises a first meshing end corresponding to the second ratchet wheel, the second ratchet wheel comprises a second meshing end corresponding to the first ratchet wheel, and the first meshing end and the second meshing end are partially meshed. According to the hub device provided by the embodiment of the invention, the first meshing end of the first ratchet wheel and the second meshing end of the second ratchet wheel are arranged to be opposite and partially meshed, so that the hub device has the beneficial effects that the friction resistance and the tooth surface abrasion of the two ratchet wheels can be effectively reduced, and the transmission efficiency and the riding experience feeling are improved.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, specifically to a hub device and a bicycle. Background Technology

[0002] The hub assembly is a crucial component in a bicycle wheel, connecting the spokes and transmitting power. As the drive wheel of a bicycle, the rear wheel hub assembly typically includes the hub, freehub, and ratchet mechanism. The ratchet mechanism is located between the freehub and the hub. When the rider pedals, the rotational power is transmitted from the freehub to the ratchet mechanism, and then from the freehub to the hub.

[0003] Please see Figure 1 , Figure 1 This is a schematic diagram of a ratchet assembly in related technologies. In these technologies, a ratchet assembly includes a pair of ratchets with their end faces facing each other. Each ratchet's end face is covered with teeth along the direction of rotation. One ratchet is connected to the freehub base, and the other is connected to the hub. The two ratchets mesh with each other. In this type of hub assembly, when the freehub base rotates, the opposing teeth in the ratchet assembly slide, generating significant frictional resistance. This reduces transmission efficiency, requiring the rider to exert more effort to pedal to propel the bicycle. When the bicycle is cruising, the increased frictional resistance accelerates the wear of the ratchet teeth, shortening their lifespan.

[0004] To address the technical problems existing in the hub assembly in related technologies, the commonly used improvement methods are: first, to use high-hardness wear-resistant materials or to reduce the wear of the two ratchet wheels of the ratchet assembly during bicycle riding through surface coating (such as tungsten carbide); second, to increase the amount of lubricating grease to reduce the frictional resistance between the two ratchet wheels. However, lubricating grease easily attracts dust or other impurity particles, causing accelerated wear and fatigue damage on the ratchet teeth, which in turn leads to a decrease in transmission performance. Utility Model Content

[0005] The embodiments of this utility model provide a hub device and a bicycle, which can improve the technical problems of low transmission efficiency, poor riding experience, and rapid wear of ratchet teeth in related technologies.

[0006] This application provides a hub device, comprising:

[0007] The connecting shaft consists of two segments positioned opposite each other.

[0008] The tower base assembly, rotatably connected to a section of the connecting shaft, is used for power input;

[0009] The hub assembly is rotatably connected to the other end of the connecting shaft and is used to output power;

[0010] The ratchet assembly includes a first ratchet and a second ratchet disposed opposite to each other, the first ratchet being connected to the freehub base assembly and the second ratchet being connected to the hub assembly;

[0011] The first ratchet includes a first engagement end corresponding to the second ratchet, and the second ratchet includes a second engagement end corresponding to the first ratchet. The first engagement end and the second engagement end are partially engaged.

[0012] In one embodiment, the first engaging end includes a first engaging region and a first vacant region, the first engaging region and the first vacant region being alternately distributed along the circumference of the first ratchet; the second engaging end includes a second engaging region, the second engaging region being continuously distributed along the circumference of the second ratchet; the first engaging region and the second engaging region engage with each other; or,

[0013] The first engaging end includes a first engaging region, which is continuously distributed along the circumference of the first ratchet. The second engaging end includes a second engaging region and a second idle region, which are alternately distributed along the circumference of the second ratchet. The first engaging region and the second engaging region engage with each other.

[0014] In one embodiment, the first meshing end includes a plurality of first ratchet teeth spaced apart circumferentially, and the second meshing end includes a plurality of second ratchet teeth continuously distributed circumferentially, wherein the first ratchet teeth and the second ratchet teeth mesh with each other; or,

[0015] The first meshing end includes a plurality of first ratchet teeth continuously distributed in the circumferential direction, and the second meshing end includes a plurality of second ratchet teeth spaced apart in the circumferential direction, wherein the first ratchet teeth and the second ratchet teeth mesh with each other.

[0016] In one embodiment, each first ratchet tooth of the first ratchet includes a first driving surface and a first sliding surface connected together, and each second ratchet tooth of the second ratchet includes a second driving surface and a second sliding surface connected together. The first driving surface and the second driving surface can abut against each other, and the first sliding surface and the second sliding surface can slide relative to each other.

[0017] The first sliding surface and the second sliding surface are not equal.

[0018] In one embodiment, the ratio of the radial dimension of the first ratchet to the radial dimension of the second ratchet is between 0.4 and 0.8; or,

[0019] The ratio of the radial dimension of the second ratchet to the radial dimension of the first ratchet is between 0.4 and 0.8.

[0020] In one embodiment, the meshing ratio of the first ratchet and the second ratchet is between 0.4 and 0.7; or,

[0021] The meshing ratio between the second ratchet and the first ratchet is between 0.4 and 0.7.

[0022] In one embodiment, the tip angle of the first ratchet tooth of the first ratchet is between 50° and 65°; and / or

[0023] The tip angle of the second ratchet tooth of the second ratchet is between 50° and 65°.

[0024] In one embodiment, the tooth height of the first ratchet tooth of the first ratchet is between 0.6 mm and 1 mm; and / or

[0025] The tooth height of the second ratchet tooth of the second ratchet ranges from 0.6 mm to 1 mm.

[0026] In one embodiment, the hub assembly includes a hub shell, the outer peripheral surface of which is provided with a plurality of annular grooves extending along the rotation direction of the hub shell, and the plurality of grooves being spaced apart along the rotation axis of the hub shell; and / or

[0027] The drum shell includes two opposite ends and a middle section connected between the two ends, and the middle section of the drum shell is bent toward the axis of rotation of the drum shell.

[0028] This application also provides a bicycle, including:

[0029] Frame;

[0030] The front wheel is rotatably mounted on the front side of the frame;

[0031] The rear wheel is rotatably mounted on the rear side of the frame; the rear wheel includes the hub device described in any embodiment of this application, and the hub device is located at the center of the rear wheel.

[0032] The beneficial effects of the embodiments of this utility model are as follows:

[0033] By setting the first engaging end of the first ratchet and the second engaging end of the second ratchet to a relative and partially engaged connection, the meshing contact area of ​​the first and second ratchets can be effectively reduced. This has the advantage that when the freehub assembly drives the hub assembly to rotate, it effectively reduces the frictional resistance of the first and second ratchets, improving the transmission efficiency of the hub assembly and the riding experience; when the bicycle is cruising, it reduces the wear on the tooth surfaces of the two ratchets, increasing their service life. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a structural schematic diagram of a ratchet assembly in related technologies;

[0036] Figure 2 This is an exploded schematic diagram of the hub device provided in the embodiments of this application;

[0037] Figure 3 This is a cross-sectional schematic diagram of the hub device provided in the embodiments of this application;

[0038] Figure 4 This is a schematic diagram of the ratchet assembly provided in an embodiment of this application;

[0039] Figure 5 This is a schematic diagram of the structure of a ratchet provided in an embodiment of this application;

[0040] Figure 6 This is a schematic diagram of another ratchet structure provided in an embodiment of this application;

[0041] Figure 7 This is a schematic diagram of the ratchet structure provided in the embodiments of this application;

[0042] Figure 8 This is a schematic diagram of the tower base shell provided in an embodiment of this application;

[0043] Figure 9 This is a schematic diagram of the structure of the drum shell provided in the embodiments of this application;

[0044] Figure 10 This is a schematic diagram of a ratchet provided in another embodiment of this application;

[0045] Figure 11 This is a comparative schematic diagram of the meshing ends of a pair of ratchet wheels provided in another embodiment of this application.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Hub assembly; 10. Connecting shaft; 20. Freehub base assembly; 21. Freehub base shell; 211. First positioning end; 2111. First positioning groove; 22. First bearing; 30. Hub assembly; 31. Hub shell; 310. Ring groove; 311. Second positioning end; 3111. Second positioning groove; 32. Second bearing; 40. Ratchet assembly; 400. Occupying structure; 41. First ratchet; 411. First engagement end; 4110. First drive angle; 4111. First engagement area; 4112. First empty area ; 411a, First ratchet; 4111a, First driving surface; 4112a, First sliding surface; 412, First assembly side; 4121, First positioning protrusion; 42, Second ratchet; 421, Second meshing end; 4210, Second driving angle; 4211, Second meshing area; 421a, Second ratchet; 4211a, Second driving surface; 4212a, Second sliding surface; 422, Second assembly side; 4221, Second positioning protrusion; 50, Limiting side cover; 61, First elastic element; 62, Second elastic element. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0049] The hub assembly is a crucial component in a bicycle wheel, connecting the spokes and transmitting power. As the drive wheel of a bicycle, the rear wheel hub assembly typically includes the hub, freehub, and ratchet mechanism. The ratchet mechanism is located between the freehub and the hub. When the rider pedals, the rotational power is transmitted from the freehub to the ratchet mechanism, and then from the freehub to the hub.

[0050] Please see Figure 1 , Figure 1This is a schematic diagram of a ratchet assembly in related technologies. In these technologies, a ratchet assembly includes a pair of ratchets with their end faces facing each other. Each ratchet's end face is covered with teeth along the direction of rotation. One ratchet is connected to the freehub base, and the other is connected to the hub. The two ratchets mesh with each other. In this type of hub assembly, when the freehub base rotates, the opposing teeth in the ratchet assembly slide, generating significant frictional resistance. This reduces transmission efficiency, requiring the rider to exert more effort to pedal to propel the bicycle. When the bicycle is cruising, the increased frictional resistance accelerates the wear of the ratchet teeth, shortening their lifespan.

[0051] To address the technical problems existing in the hub assembly in related technologies, the commonly used improvement methods are: first, to use high-hardness wear-resistant materials or to reduce the wear of the two ratchet wheels of the ratchet assembly during bicycle riding through surface coating (such as tungsten carbide); second, to increase the amount of lubricating grease to reduce the frictional resistance between the two ratchet wheels. However, lubricating grease easily attracts dust or other impurity particles, causing accelerated wear and fatigue damage on the ratchet teeth, which in turn leads to a decrease in transmission performance.

[0052] Based on the technical problems existing in the hub device in the related technology, this application provides a hub device 1, which can improve the low transmission efficiency, poor riding experience and rapid tooth surface wear of the hub device in the related technology.

[0053] Please see Figure 2 and Figure 3 , Figure 2 This is an exploded schematic diagram of the hub device provided in the embodiments of this application. Figure 3 This is a cross-sectional schematic diagram of the hub device provided in an embodiment of this application. The hub device 1 provided in this application includes a connecting shaft 10, a freehub assembly 20, a hub assembly 30, and a ratchet assembly 40.

[0054] The connecting shaft 10 positions and connects the freehub base assembly 20 and the hub assembly 30. The connecting shaft 10 may include two sections arranged opposite to each other, one section of the connecting shaft 10 being rotatably connected to the freehub base assembly 20, and the other section of the connecting shaft 10 being rotatably connected to the hub assembly 30.

[0055] The freehub assembly 20 is used for power input. The hub assembly 30 is used for power output. The ratchet assembly 40 is located between the freehub assembly 20 and the hub assembly 30, providing a drive connection between them.

[0056] Please see Figures 4 to 7 , Figure 4 This is a schematic diagram of the ratchet assembly provided in an embodiment of this application. Figure 5 This is a schematic diagram of a ratchet provided in an embodiment of this application. Figure 6 This is a schematic diagram of another ratchet structure provided in an embodiment of this application. Figure 7This is a schematic diagram of the ratchet structure provided in the embodiments of this application.

[0057] The ratchet assembly 40 includes a first ratchet 41 and a second ratchet 42 disposed opposite to each other. The first ratchet 41 is connected to the base assembly 20, and the second ratchet 42 is connected to the hub assembly 30. The first ratchet 41 includes a first engagement end 411 corresponding to the second ratchet 42, and the second ratchet 42 includes a second engagement end 421 corresponding to the first ratchet 41. The first engagement end 411 and the second engagement end 421 are partially engaged.

[0058] Specifically, the first engagement end 411 includes a plurality of first ratchet teeth 411a, each first ratchet tooth 411a including a first driving surface 4111a and a first sliding surface 4112a connected to each other. The second engagement end 421 includes a plurality of second ratchet teeth 421a, each second ratchet tooth 421a including a second driving surface 4211a and a second sliding surface 4212a connected to each other. The first driving surface 4111a and the second driving surface 4211a are opposite to each other and can abut against each other to transmit torque. The first driving surface 4111a is used to transmit driving force, the second driving surface 4211a is used to bear driving force, and the first sliding surface 4112a and the second sliding surface 4212a are opposite to each other and can perform relative sliding motion.

[0059] "Partial engagement" can be caused by the number of teeth of the first ratchet 411a being unequal to the number of teeth of the second ratchet 421a, and / or the first sliding surface 4112a and the second sliding surface 4212a being unequal. For example, the number of teeth of the first ratchet 411a is unequal to the number of teeth of the second ratchet 421a, but the first sliding surface 4112a and the second sliding surface 4212a are equal; or, the number of teeth of the first ratchet 411a is equal to the number of teeth of the second ratchet 421a, but the first sliding surface 4112a and the second sliding surface 4212a are unequal; or, the number of teeth of the first ratchet 411a is unequal to the number of teeth of the second ratchet 421a, but the first sliding surface 4112a and the second sliding surface 4212a are unequal.

[0060] In practical use, the freewheel assembly 20 is used to connect to the freewheel and input the power from the rider's pedaling. The hub assembly 30 is used to connect the spokes, supporting the rim and outputting power outwards.

[0061] When the freehub assembly 20 rotates in the first rotation direction (i.e., the driving direction), the first driving surface 4111a abuts against the second driving surface 4211a, the first ratchet 41 and the second ratchet 42 are in a locked state with a transmission connection, and the first sliding surface 4112a and the second sliding surface 4212a are relatively stationary. The freehub assembly 20 can drive the hub assembly 30 to rotate through the ratchet assembly 40, thereby causing the wheel to rotate. When the freehub assembly 20 rotates in the second rotation direction (i.e., the non-driving direction), the first sliding surface 4112a and the second sliding surface 4212a of the ratchet assembly 40 slide relative to each other, the ratchet assembly 40 is not locked, the first ratchet 41 and the second ratchet 42 can rotate relative to each other, the freehub assembly 20 spins freely, and the freehub assembly 20 cannot drive the hub assembly 30 to rotate.

[0062] The hub assembly 1 provided in this application embodiment, by setting the first engaging end 411 of the first ratchet 41 and the second engaging end 421 of the second ratchet 42 to a relatively partially engaged connection, can effectively reduce the meshing contact area of ​​the first ratchet 41 and the second ratchet 42. Its advantages are that when the freehub assembly 20 drives the hub assembly 30 to rotate, it can effectively reduce the frictional resistance of the first ratchet 41 and the second ratchet 42, improving the transmission efficiency and riding experience of the hub assembly 1; when the bicycle is cruising, it can reduce the wear on the tooth surfaces of the two ratchets, increasing their service life.

[0063] Please see Figure 2 and Figure 3 The connecting shaft 10 may include two shaft segments arranged opposite to each other, one shaft segment being rotatably connected to the base assembly 20, and the other shaft segment being rotatably connected to the hub assembly 30.

[0064] Specifically, the tower base assembly 20 may include a tower base shell 21 and a first bearing 22. The tower base shell 21 is a hollow shell with a first chamber inside, and the first bearing 22 is installed in the first chamber.

[0065] The hub assembly 30 may include a hub shell 31 and a second bearing 32. The hub shell 31 is also a hollow shell, and a second chamber is provided inside the hub shell 31. The second bearing 32 is installed in the second chamber.

[0066] The connecting shaft 10 passes through the first bearing 22 and the second bearing 32, so that the hub assembly 30 and the base assembly 20 are rotatably connected to the connecting shaft 10.

[0067] The hub assembly 1 may also include two limiting side covers 50, which are disposed opposite to each other at the two ends of the connecting shaft 10. The base assembly 20 and the hub assembly 30 are disposed between the two limiting side covers 50, and one limiting side cover 50 is sealed to the base assembly 20, while the other limiting side cover 50 is sealed to the hub assembly 30.

[0068] For example, the two ends of the connecting shaft 10 may be provided with external threads, and correspondingly, the two limiting side covers 50 may be provided with matching internal threads, so that the two limiting side covers 50 can be screwed to the two ends of the connecting shaft 10, thereby restricting the axial movement of the base assembly 20 and the hub assembly 30 along the connecting shaft 10.

[0069] Please see Figure 5 and Figure 8 , Figure 8 This is a schematic diagram of the structure of the hub base shell provided in the embodiment of this application. The hub base shell 21 has a first positioning end 211 near the hub assembly 30, and a first ratchet 41 is positioned and connected to the first positioning end 211. Specifically, the first ratchet 41 also includes a first mounting side 412 facing away from the first engagement end 411. The first mounting side 412 is provided with a first positioning protrusion 4121. Correspondingly, the first positioning end 211 is provided with a first positioning groove 2111, and the first positioning protrusion 4121 is adapted to fit into the first positioning groove 2111.

[0070] Understandably, in one embodiment, the first assembly side 412 may be provided with a first positioning groove 2111, and the first positioning end 211 may be provided with a first positioning protrusion 4121, the first positioning protrusion 4121 being adapted to the first positioning groove 2111. Alternatively, the first assembly side 412 may be provided with both the first positioning protrusion 4121 and the first positioning groove 2111, and the first positioning end 211 may also be provided with both the first positioning groove 2111 and the first positioning protrusion 4121, the first assembly side 412 and the first positioning end 211 being adapted to each other through the first positioning protrusion 4121 and the first positioning groove 2111. Any of the above embodiments can effectively limit the circumferential rotation between the first ratchet 41 and the tower base shell 21, thereby enabling the rotational movement of the tower base assembly 20 to be transmitted to the second ratchet 42 through the first ratchet 41.

[0071] Please see Figure 6 and Figure 9 , Figure 9 This is a schematic diagram of the hub shell provided in an embodiment of this application. The hub shell 31 has a second positioning end 311 near the base assembly 20, and a second ratchet 42 is positioned and connected to the second positioning end 311. Specifically, the second ratchet 42 also includes a second mounting side 421 facing away from the second engagement end 421. The second mounting side 422 is provided with a second positioning protrusion 4221. Correspondingly, the second positioning end 311 has a second positioning groove 3111, and the second positioning protrusion 4221 is adapted to fit into the second positioning groove 3111.

[0072] Understandably, in one embodiment, the second assembly side 422 may also be provided with a second positioning groove 3111, and the second positioning end 311 may be provided with a second positioning protrusion 4221, which fits into the second positioning groove 3111. Alternatively, the second assembly side 422 may be provided with both a second positioning protrusion 4221 and a second positioning groove 3111, and the second positioning end 311 may be provided with both a second positioning groove 3111 and a second positioning protrusion 4221, with the second assembly side 422 and the second positioning end 311 fitting together via the second positioning protrusion 4221 and the second positioning groove 3111. Any of the above embodiments can effectively limit the circumferential rotation between the second ratchet 42 and the hub shell 31, thereby enabling the rotational movement of the base assembly 20 to be transmitted to the second ratchet 42 via the first ratchet 41.

[0073] In this embodiment, the first ratchet 41 may be elastically connected to the first positioning end 211, and / or the second ratchet 42 may be elastically connected to the second positioning end 311. For example, the first ratchet 41 may be elastically connected to the first positioning end 211, and the second ratchet 42 may be rigidly connected to the second positioning end 311. Alternatively, the first ratchet 41 may be rigidly connected to the first positioning end 211, and the second ratchet 42 may be elastically connected to the second positioning end 311. Or, the first ratchet 41 may be elastically connected to the first positioning end 211, and the second ratchet 42 may be elastically connected to the second positioning end 311. Here, "elastic connection" means that the two connected components are connected by an elastic element, and the two connected components can be relatively far apart or close to each other; "rigid connection" means that the two connected components do not undergo or only undergo slight relative displacement or rotation.

[0074] Please see Figure 2 The hub assembly 1 may also include an elastic element, such as a spring. A first elastic element 61 may be installed between the first mounting side 412 and the first positioning end 211, and / or a second elastic element 62 may be installed between the second mounting side 421 and the second positioning end 311, so that the ratchet assembly can abut against the first ratchet 41 and the second ratchet 42 under the elastic force of the spring. When the freehub assembly 20 rotates in the first rotation direction, the first ratchet 41 and the second ratchet 42 can remain locked, and the first ratchet 41 and the second ratchet 42 can remain engaged under the elastic force, thereby allowing the entire hub assembly 1 to rotate. When the freehub assembly 20 rotates in the second rotation direction, the first ratchet 411a and the second ratchet 421a, which were originally engaged, can slide relative to each other under the drive of the freehub assembly 20, thereby allowing the freehub assembly 20 to idle. When the first ratchet 41 rotates to the target position, it can engage with the second ratchet 42 again.

[0075] In some embodiments, the first positioning protrusion 4121 may have a first receiving groove, the first elastic member 61 is installed in the first receiving groove, the first positioning protrusion 4121 and the first positioning groove are in clearance fit, and the two ends of the first elastic member 61 are elastically connected to the first assembly side 412 and the first positioning end 211, respectively. And / or, the second positioning protrusion 4221 may have a second receiving groove, the second elastic member 62 is installed in the second receiving groove, the second positioning protrusion 4221 and the second positioning groove are in clearance fit, and the two ends of the second elastic member 62 are elastically connected to the second assembly side 422 and the second positioning end 311, respectively.

[0076] By setting the elastic elements (first elastic element 61, second elastic element 62) on the positioning protrusions (first positioning protrusion 4121, second positioning protrusion 4221), with the elastic elements and positioning protrusions overlapping, the advantages are that it avoids the need to occupy extra space on the end sides of the first ratchet 41 and / or the second ratchet 42 when installing the elastic elements, thus improving the compactness of the structure. It can also effectively prevent the elastic elements from popping out accidentally, ensuring the reliability and safety of component assembly.

[0077] Please see Figure 5 and Figure 6 In one embodiment, the first engagement end 411 may include a first engagement region 4111 and a first idle region 4112, which are alternately distributed along the circumference of the first ratchet 41. The second engagement end 421 includes a second engagement region 4211, which is continuously distributed along the circumference of the second ratchet 42. The first engagement region 4111 and the second engagement region 4211 engage with each other.

[0078] Alternatively, in some embodiments, the first engaging end 411 includes a first engaging region 4111, which is continuously distributed along the circumference of the first ratchet 41, and the second engaging end 421 includes a second engaging region 4211 and a second vacant region, which are alternately distributed along the circumference of the second ratchet 42, and the first engaging region 4111 and the second engaging region 4211 engage with each other.

[0079] The first meshing region 4111 includes a plurality of first ratchet teeth 411a, which are continuously distributed in the first meshing region 4111. The second meshing region 4211 includes a plurality of second ratchet teeth 421a, which are continuously distributed in the second meshing region 4211.

[0080] The first ratchet 41 and the second ratchet 42 are annular structures. For ease of understanding, an embodiment in which the first engagement end 411 includes alternating first engagement regions 4111 and first idle regions 4112 (i.e., the illustrated embodiment) is given as an example. Since the implementation principle is the same, this illustrative description can also be applied to the description of embodiments in which the first engagement end 411 includes continuously distributed first engagement regions 4111 and the second engagement end 421 includes alternating second engagement regions 4211 and second idle regions.

[0081] For example, the first engagement area 4111 may have one, two, or more, and the corresponding first idle area 4112 may have one, two, or more. An indefinite number of first engagement areas 4111 and an indefinite number of first idle areas 4112 are alternately distributed along the circumference of the first ratchet 41 at the first engagement end 411 of the first ratchet 41. The second engagement area 4211 is continuously distributed along the circumference of the second ratchet 42 at the second engagement end 421 of the second ratchet 42. In embodiments including two or more first engagement areas 4111, the number of first ratchet teeth 411a contained in each first engagement area 4111 may be equal or unequal, and the circumferential width of each first idle area 4112 may be equal or unequal. When the number of first ratchet teeth 411a contained in each first engagement area 4111 is equal, and the circumferential width of each first idle area 4112 is equal, stress can be better distributed, and localized wear can be reduced. For example, the first ratchet 41 may have 36 first ratchet teeth 411a and 6 first engagement areas 4111. Each first engagement area 4111 includes 6 consecutively arranged first ratchet teeth 411a. The circumferential width of the first empty area 4112 between two adjacent first engagement areas 4111 is equal to the circumferential tooth width of the 6 first ratchet teeth 411a. The second ratchet 42 may have 72 second ratchet teeth 421a, which are continuously distributed along the circumference of the second ratchet 42.

[0082] By engaging an indefinite number of first engagement zones 4111 with second engagement zones 4211, or engaging the first engagement zone 4111 with an indefinite number of second engagement zones 4211, the number of meshing teeth pairs is reduced compared to the ratchet assembly 40 in the related art. When the first ratchet 41 and the second ratchet 42 make relative sliding movements, the sliding friction can be effectively reduced, thereby reducing wear and improving transmission efficiency.

[0083] Please see Figure 6 and Figure 10 , Figure 10This is a schematic diagram of a ratchet provided in another embodiment of this application. In one embodiment, the first meshing end 411 may include a plurality of first ratchet teeth 411a distributed circumferentially at intervals, and the second meshing end 421 may include a plurality of second ratchet teeth 421a continuously distributed circumferentially, wherein the first ratchet teeth 411a and the second ratchet teeth 421a mesh with each other.

[0084] Alternatively, in other embodiments, the first engagement end 411 may include a plurality of first ratchet teeth 411a continuously distributed in the circumferential direction, and the second engagement end 421 may include a plurality of second ratchet teeth 421a spaced apart in the circumferential direction, wherein the first ratchet teeth 411a and the second ratchet teeth 421a engage with each other.

[0085] The following is a schematic description of an embodiment in which multiple first ratchet teeth 411a are distributed circumferentially at intervals and multiple second ratchet teeth 421a are distributed continuously circumferentially. Since the implementation principle is the same, the embodiment in which multiple first ratchet teeth 411a are distributed continuously circumferentially and multiple second ratchet teeth 421a are distributed at intervals circumferentially can refer to this description.

[0086] For example, the first meshing end 411 may be pre-set with a plurality of first ratchet teeth 411a continuously distributed in the circumferential direction, and the second meshing end 421 is provided with the same number of second ratchet teeth 421a continuously distributed in the circumferential direction. Then, a portion of the tooth tips of the first ratchet teeth 411a are removed by grinding or other subtractive methods, so that a portion of the first ratchet teeth 411a form a vacant structure 400 that cannot effectively mesh with the second ratchet teeth 421a. The remaining first ratchet teeth 411a are spaced apart and can effectively mesh with the second ratchet teeth 421a. The remaining first ratchet teeth 411a are arranged at equal or unequal intervals. When they are arranged at equal intervals, stress can be more effectively dispersed and local wear can be reduced.

[0087] The ratio of the height of the occupant structure 400 to the height of the first ratchet 411a can be 0.5 to 0.7, specifically any selectable ratio value among 0.5, 0.6, and 0.7, or other values ​​between 0.5 and 0.7. This application does not impose specific limitations on the embodiments. For example, in one embodiment, the tooth height of the first ratchet 411a is 0.7 mm, and by removing 0.3 mm of height, an occupant structure 400 with a height of 0.4 mm can be formed.

[0088] Those skilled in the art will understand that an empty spacer structure 400 can also be used between two adjacent first ratchet teeth 411a, which can also achieve the spaced distribution of multiple first ratchet teeth 411a.

[0089] By setting multiple ratchet teeth of one ratchet to be spaced apart circumferentially and setting the ratchet teeth of the other ratchet to be continuously distributed circumferentially, when the two ratchets mesh, the number of meshing tooth pairs can be reduced, thereby reducing the contact area between the ratchets, effectively reducing sliding friction, improving transmission efficiency and reducing wear.

[0090] In implementing the above embodiments, the inventors discovered that when the meshing ratio of the first ratchet 41 and the second ratchet 42 is between 0.4 and 0.7, or when the meshing ratio of the second ratchet 42 and the first ratchet 41 is between 0.4 and 0.7, the transmission tooth pair can be ensured while reducing frictional resistance and improving transmission efficiency.

[0091] The meshing ratio refers to the ratio of the number of teeth of the two ratchet wheels (first ratchet 41 and second ratchet 42). The meshing ratio can be any value between 0.4 and 0.7. For example, the meshing ratio between the two ratchet wheels can be any of the optional values ​​of 0.4, 0.5, 0.6, and 0.7. The embodiments of this application do not impose specific limitations.

[0092] Please see Figure 6 and Figure 11 , Figure 11 This is a comparative schematic diagram of the meshing ends of a pair of ratchet wheels provided in another embodiment of this application, wherein, Figure 11 The left side shows a schematic diagram of one of the ratchet mechanisms. Figure 11 The diagram on the right shows the structure of another ratchet. In some embodiments, the first sliding surface 4112a of the first ratchet 411a and the second sliding surface 4212a of the second ratchet 421a can be set to be unequal to reduce the contact area of ​​the meshing ratchet pair. Specifically, the first sliding surface 4112a can be set to be smaller than the second sliding surface 4212a, or the second sliding surface 4212a can be set to be smaller than the first sliding surface 4112a.

[0093] To facilitate understanding of the embodiments, an example of an embodiment where the first sliding surface 4112a is smaller than the second sliding surface 4212a is used for illustrative description. Since the principle of the embodiments is the same, this illustrative description can also be applied to the description of embodiments where the second sliding surface 4212a is smaller than the first sliding surface 4112a.

[0094] For example, the first engagement end 411 includes a first ratchet 411a distributed circumferentially, and the second engagement end 421 includes a second ratchet 421a distributed circumferentially. In the radial direction, the radial dimension of the first ratchet 411a may be smaller than the radial dimension of the second ratchet 421a, and / or, in the circumferential direction, the circumferential dimension of the first ratchet 411a may be smaller than the circumferential dimension of the second ratchet 421a.

[0095] In implementing this embodiment, the inventors discovered that when the ratio of the radial dimension of the first ratchet 411a to the radial dimension of the second ratchet 421a is between 0.4 and 0.8, or when the ratio of the radial dimension of the second ratchet 421a to the radial dimension of the first ratchet 411a is between 0.4 and 0.8, the transmission design requirements of the ratchet assembly 40 can be ensured while reducing the wear of the meshing ratchets.

[0096] For example, the ratio of radial dimensions can be any of the optional ratios of 0.4, 0.5, 0.6, 0.7, and 0.8, or any other value between 0.4 and 0.8.

[0097] Please see Figure 7 In any embodiment of this application, the first ratchet 411a and the second ratchet 421a may have equal tooth profile parameters. For example, the tip angle of the first ratchet 411a may be between 50° and 65°, and / or the tip angle of the second ratchet 421a may be between 50° and 65°. The tooth height of the ratchet of the first ratchet 41 may be between 0.6 mm and 1 mm, and / or the tooth height of the ratchet of the second ratchet 42 may be between 0.6 mm and 1 mm. The first drive angle 4110 and the second drive angle 4210 may be equal, and both the first drive angle 4110 and the second drive angle 4210 may be less than 90 degrees. For example, the tip angle of the first ratchet 411a and the second ratchet 421a may be set to 60°, the tooth height of the first ratchet 411a and the second ratchet 421a may be set to 0.7 mm, and the first drive angle 4110 and the second drive angle 4210 may be set to 80°.

[0098] Among them, "tooth tip angle" is the angle between the driving surface and the sliding surface in the same ratchet, "tooth height" is the distance between the ratchet tip line (the intersection of the driving surface and the sliding surface) and the tooth root connecting line L (the tooth root connecting line can connect the tooth roots of at least two ratchets and is a construction line fabricated for the convenience of description in the manual) in the same ratchet, and the driving angle refers to the angle between the plane where the driving surface and the tooth root connecting line are located in a ratchet.

[0099] In any embodiment of this application, the first ratchet 41 and / or the second ratchet 42 may be made of bearing steel Gcr15, or other materials may be used. The first ratchet 41 and the second ratchet 42 may be formed by CNC (Computer Numerical Control) or other processing methods.

[0100] In any embodiment of this application, the ratchet teeth of the first ratchet 41 are provided with a wear-resistant layer, and / or the ratchet teeth of the second ratchet 42 are provided with a wear-resistant layer. In one embodiment, the wear-resistant layer can be provided on the ratchet with fewer teeth. For example, in an embodiment where the number of teeth of the first ratchet 411a is less than the number of teeth of the second ratchet 421a, the wear-resistant layer can be provided on the first ratchet 411a, or it can be formed by heat treatment of the ratchet teeth, while the second ratchet 421a may not have a wear-resistant layer. Of course, lubricating grease can also be added between the two ratchets to reduce frictional resistance, thereby reducing wear.

[0101] Please see Figure 3In implementing the embodiments of this application, the inventors also discovered that multiple annular grooves 310 can be provided on the outer peripheral surface of the hub shell 31. The annular grooves 310 extend along the rotation direction of the hub shell 31, and the multiple annular grooves 310 are distributed at intervals along the rotation axis of the hub shell 31. By providing multiple grooves 310 on the outer surface of the hub shell 31, when the airflow passes over the hub in this structure of the hub device 1, the annular grooves can disturb the boundary layer airflow close to the surface of the hub, causing the boundary layer airflow to change from laminar flow to turbulent flow, delaying airflow separation, reducing the low-pressure area behind the hub, reducing pressure drag, and thus reducing wind resistance.

[0102] Please continue reading. Figure 3 In one embodiment, the hub shell 31 includes two oppositely disposed ends and a middle portion connecting the two ends, with the middle portion of the hub shell 31 curved toward the axis of rotation of the hub shell 31. By designing the middle portion of the hub shell 31 as an axially curved concave surface, when a bicycle equipped with this hub device 1 is in motion, the curved concave surface structure allows airflow to flow more smoothly on the surface of the hub shell 31, reducing airflow separation and turbulence generation. This reduces turbulence flowing over the hub shell 31 during riding, allowing air to flow more closely to the surface of the hub shell 31, reducing the pressure difference between the front and back of the hub shell 31, and thus reducing wind resistance. Especially during high-speed riding, it reduces energy loss due to air resistance, thereby reducing wind resistance.

[0103] Based on the hub device 1 provided in the embodiments of this application, this application also provides a bicycle (not shown in the figure), which may include a frame, a front wheel and a rear wheel.

[0104] The front wheel is rotatably located on the front side of the frame, and the rear wheel is rotatably located on the rear side of the frame. The rear wheel includes a hub device 1 according to any embodiment of this application, and the hub device 1 is located at the center of the rear wheel.

[0105] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A flower drum device, characterized in that, include: The connecting shaft consists of two segments positioned opposite each other. The tower base assembly, rotatably connected to a section of the connecting shaft, is used for power input; The hub assembly is rotatably connected to the other end of the connecting shaft and is used to output power; The ratchet assembly includes a first ratchet and a second ratchet disposed opposite to each other, the first ratchet being connected to the freehub base assembly and the second ratchet being connected to the hub assembly; The first ratchet includes a first engagement end corresponding to the second ratchet, and the second ratchet includes a second engagement end corresponding to the first ratchet. The first engagement end and the second engagement end are partially engaged.

2. The hub device according to claim 1, characterized in that, The first engaging end includes a first engaging region and a first idle region, which are alternately distributed along the circumference of the first ratchet. The second engaging end includes a second engaging region, which is continuously distributed along the circumference of the second ratchet. The first engaging region and the second engaging region engage with each other; or, The first engaging end includes a first engaging region, which is continuously distributed along the circumference of the first ratchet. The second engaging end includes a second engaging region and a second idle region, which are alternately distributed along the circumference of the second ratchet. The first engaging region and the second engaging region engage with each other.

3. The hub device according to claim 1, characterized in that, The first meshing end includes a plurality of first ratchet teeth spaced apart circumferentially, and the second meshing end includes a plurality of second ratchet teeth continuously distributed circumferentially, wherein the first ratchet teeth and the second ratchet teeth mesh with each other; or, The first meshing end includes a plurality of first ratchet teeth continuously distributed in the circumferential direction, and the second meshing end includes a plurality of second ratchet teeth spaced apart in the circumferential direction, wherein the first ratchet teeth and the second ratchet teeth mesh with each other.

4. The hub device according to any one of claims 1-3, characterized in that, Each first ratchet tooth of the first ratchet includes a first driving surface and a first sliding surface connected together, and each second ratchet tooth of the second ratchet includes a second driving surface and a second sliding surface connected together. The first driving surface and the second driving surface can abut against each other, and the first sliding surface and the second sliding surface can slide relative to each other. The first sliding surface and the second sliding surface are not equal.

5. The hub device according to claim 4, characterized in that, The ratio of the radial dimension of the first ratchet to the radial dimension of the second ratchet is between 0.4 and 0.8; or, The ratio of the radial dimension of the second ratchet to the radial dimension of the first ratchet is between 0.4 and 0.

8.

6. The hub device according to any one of claims 1-3, characterized in that, The meshing ratio between the first ratchet and the second ratchet is between 0.4 and 0.7; or, The meshing ratio between the second ratchet and the first ratchet is between 0.4 and 0.

7.

7. The hub device according to any one of claims 1-3, characterized in that, The tip angle of the first ratchet tooth of the first ratchet is between 50° and 65°; and / or The tip angle of the second ratchet tooth of the second ratchet is between 50° and 65°.

8. The hub device according to any one of claims 1-3, characterized in that, The tooth height of the first ratchet tooth of the first ratchet is between 0.6 mm and 1 mm; and / or The tooth height of the second ratchet tooth of the second ratchet ranges from 0.6 mm to 1 mm.

9. The hub device according to any one of claims 1-3, characterized in that, The hub assembly includes a hub shell, the outer peripheral surface of which is provided with a plurality of annular grooves extending along the rotation direction of the hub shell, and the plurality of grooves being spaced apart along the rotation axis of the hub shell; and / or The drum shell includes two opposite ends and a middle section connected between the two ends, and the middle section of the drum shell is bent toward the axis of rotation of the drum shell.

10. A bicycle, characterized in that, include: Frame; The front wheel is rotatably mounted on the front side of the frame; The rear wheel is rotatably disposed at the rear of the frame; the rear wheel includes a hub assembly as described in any one of claims 1-9, the hub assembly being disposed at the center of the rear wheel.

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