Transmission system and bicycle

Abstract

The utility model belongs to the technical field of bicycles, and provides a transmission system which comprises a bicycle frame, a belt, a first gear and a second gear. The first gear is connected with a driving shaft on the frame and located on the outer side of the frame, the second gear is connected to a rear wheel shaft on the frame and located on the outer side of the frame and located on the same side as the first gear, and the first gear is connected with the second gear through a belt. After the transmission system is adopted, due to the fact that the transmission system is located outside the bicycle frame and uses belt transmission, after the transmission system is damaged or dirty, the belt can be easily detached, or the first gear or the second gear can be detached for maintenance and cleaning, and the transmission system is convenient to use. The cleaning device is particularly suitable for mountain bikes which need to be cleaned frequently.

Description

Technical Field

[0001] This utility model relates to the field of bicycle transmission system technology, and more particularly to a transmission system and a bicycle. Background Technology

[0002] Currently, bicycles on the market have their transmission structure located inside the frame. If a belt is used as the transmission component, the rear triangle of the frame needs to be disconnected during installation, which leads to a complex frame structure and troublesome installation, disassembly and maintenance. Utility Model Content

[0003] In view of this, the present invention provides a transmission system and a bicycle to solve the problems in the background art described above.

[0004] To achieve one or more of the above objectives or other objectives, this utility model proposes a transmission system for a bicycle, including a frame, a belt, a first gear, and a second gear;

[0005] The first gear is connected to the drive shaft on the frame and is located on the outside of the frame. The second gear is connected to the rear wheel axle on the frame and is located on the outside of the frame and on the same side as the first gear. The first gear and the second gear are connected by a belt.

[0006] Furthermore, the transmission system also includes a tensioning screw, a tensioning lever, and a tensioning wheel. The tensioning lever is movably connected to the frame, the tensioning wheel is connected to one end of the tensioning lever and abuts against the belt, and the tensioning screw is connected to the other end of the tensioning lever and abuts against the frame.

[0007] Furthermore, at least a portion of the tooth groove sides of the first gear and the second gear are provided with anti-detachment plates, and the anti-detachment plates of the first gear and the second gear are circumferentially distributed on both the inner and outer sides.

[0008] Furthermore, at least a portion of the tooth groove sides of the first gear and the second gear are provided with anti-detachment plates;

[0009] i) The anti-detachment plates of the first gear are circumferentially distributed on both the inner and outer sides, the anti-detachment plates of the second gear are circumferentially distributed on one side, and the anti-detachment plates of the second gear are distributed only within a circumferential 180-degree range on the other side; or,

[0010] ii) The anti-detachment plates of the second gear are circumferentially distributed on both the inner and outer sides, the anti-detachment plates of the first gear are circumferentially distributed on one side, and the anti-detachment plates of the first gear are distributed only within a circumferential 180-degree range on the other side.

[0011] Furthermore, the second gear has a ratchet on its inner side along its axial direction, and the second gear is unidirectionally connected to the rear wheel axle on the frame through the ratchet.

[0012] Furthermore, the vehicle frame is equipped with a gearbox, and the drive shaft is the output shaft of the gearbox.

[0013] Furthermore, the frame also includes hubs, drive rods, external connectors, and retaining screws;

[0014] The outer wall of the transmission rod is provided with a ratchet portion, and the outer wall of the transmission rod is fitted with a first bearing on both sides of the ratchet portion. The rear wheel axle is a key shaft. The side wall of the second gear extends with a ratchet portion. The frame has a first connecting hole and a second connecting hole. The first connecting hole is provided with a first bearing, and the second connecting hole is provided with a second bearing. The external component is provided in the first connecting hole and connected to the first bearing in the first connecting hole.

[0015] The rear wheel axle passes sequentially through the external connector, the hub's axle, the second connecting hole, and the drive rod. The rear wheel axle is circumferentially fixedly connected to both the hub and the drive rod, and the drive rod is located inside the second connecting hole. The ratchet portion is inserted into the second connecting hole and unidirectionally connected to the ratchet portion, and is connected to the second bearing inside the second connecting hole and the first bearings on both sides of the ratchet portion. The fixing screw passes through the second gear and is fixedly connected to the rear wheel axle.

[0016] Furthermore, the ratchet part includes a ratchet seat and multiple pawls. The ratchet seat has multiple mounting slots corresponding to the multiple pawls. One end of the pawl is rotatably connected to the mounting slot, and the other end of the pawl can extend out of the mounting slot and mesh with the internal tooth ring. An elastic element is provided in the mounting slot and connected to the back of the pawl. The compression direction of the elastic element is the same as the rotation direction of the transmission rod.

[0017] Furthermore, the frame also includes an outer sealing ring, which is installed on the outside of the first connecting hole.

[0018] To achieve one or more of the above objectives or other objectives, this utility model also proposes a bicycle, which includes the transmission system described in any of the above claims.

[0019] Implementing the embodiments of this utility model will have the following beneficial effects:

[0020] With the above-mentioned transmission system, since the transmission system is located outside the bicycle frame and uses belt drive, if the transmission system is damaged or dirty, the belt can be easily removed, or the first or second gear can be removed for maintenance and cleaning. This is especially suitable for mountain bikes, which are models that require frequent cleaning. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0022] in:

[0023] Figure 1 This is a schematic diagram of the transmission system in one embodiment of the present invention;

[0024] Figure 2 This is an exploded view of the transmission system in one embodiment of the present invention;

[0025] Figure 3 This is an exploded view of the transmission system in another embodiment of the present invention;

[0026] Figure 4 This is an exploded view of the transmission system in another embodiment of the present invention;

[0027] Figure 5 This is an exploded view of the transmission system in another embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of a bicycle in one embodiment of the present invention;

[0029] Figure 7 for Figure 6 Schematic diagram of section AA.

[0030] Figure label:

[0031] 1. Frame; 11. Drive shaft; 12. Rear axle; 2. Belt; 3. First gear; 31. Anti-slip plate; 4. Second gear; 41. Ratchet; 41a. Ratchet part; 5. Tensioning screw; 6. Tensioning lever; 7. Tensioning wheel; 8. Hub; 9. Drive rod; 91. Ratchet part; 10. External part; 100. First bearing; 101. Second bearing; 102. Sealing ring; 103. Fixing screw. Detailed Implementation

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] Reference Figures 1 to 7 This utility model proposes a transmission system for a bicycle, including a frame 1, a belt 2, a first gear 3, and a second gear 4;

[0036] The first gear 3 is connected to the drive shaft 11 on the frame 1 and is located on the outside of the frame 1. The second gear 4 is connected to the rear wheel axle 12 on the frame 1 and is located on the outside of the frame 1 and on the same side as the first gear 3. The first gear 3 and the second gear 4 are connected by a belt 2.

[0037] In this embodiment, the aforementioned transmission system is formed by placing the first gear 3 and the second gear 4 on the outside of the frame 1 and connecting them via a belt 2 to create an external transmission structure. This structure allows for easy removal of the belt 2, or the first gear 3 or the second gear 4, for maintenance and cleaning if the transmission system becomes damaged or dirty. This is particularly suitable for mountain bikes, which require frequent cleaning. It is worth noting that a protective cover can be added to the outside of the belt 2.

[0038] In some embodiments, the transmission system further includes a tensioning screw 5, a tensioning lever 6, and a tensioning wheel 7. The tensioning lever 6 is movably connected to the frame 1, the tensioning wheel 7 is connected to one end of the tensioning lever 6 and abuts against the belt 2, and the tensioning screw 5 is connected to the other end of the tensioning lever 6 and abuts against the frame 1.

[0039] In this embodiment, to further facilitate the assembly and disassembly of belt 2, the following can be provided: Figure 1 and Figure 3 The tension screw 5, tension lever 6, and tension wheel 7 are shown. The tension wheel 7 is connected to the tension lever 6 via a bearing. That is, by adjusting the tension screw 5, the tension of the belt 2 can be adjusted through the lever principle. Loosening the tension wheel 7 allows the belt 2 to be quickly removed. Adjusting the tension wheel 7 to the appropriate position allows for riding.

[0040] Reference Figure 4 In some embodiments, at least a portion of the tooth groove sides of the first gear 3 and the second gear 4 are provided with anti-detachment plates 31, and the anti-detachment plates 31 of the first gear 3 and the second gear 4 are circumferentially distributed on both the inner and outer sides.

[0041] In this embodiment, the belt 2 can be an internal toothed belt 2. Since the belt 2 does not have a snap-fit ​​structure like a chain and gears, the anti-detachment plate 31 can prevent the belt 2 from shifting and dislodging during use.

[0042] In some embodiments, at least a portion of the tooth groove sides of the first gear 3 and the second gear 4 are provided with anti-detachment plates 31;

[0043] i) The anti-detachment plates 31 of the first gear 3 are circumferentially distributed on both the inner and outer sides, the anti-detachment plates 31 of the second gear 4 are circumferentially distributed on one side, and the anti-detachment plates 31 of the second gear 4 are distributed only within a circumferential 180-degree range on the other side; or,

[0044] ii) The anti-detachment plate 31 of the second gear 4 is circumferentially distributed on both the inner and outer sides, the anti-detachment plate 31 of the first gear 3 is circumferentially distributed on one side, and the anti-detachment plate 31 of the first gear 3 is distributed only within a circumferential 180-degree range on the other side.

[0045] In this embodiment, to facilitate the installation and removal of the belt 2, the anti-detachment plate 31 can be set as described in i) or ii) above, which makes the installation and removal of the belt 2 easier. In comparison, compared with the method where the first gear 3 and the second gear 4 are covered with anti-detachment plates 31, the method in i) or ii) requires the belt 2 to be long enough to pass over more anti-detachment plates 31 for installation, thus requiring a longer belt 2 for better installation.

[0046] In some embodiments, the second gear 4 has a ratchet 41 on its inner side along its axial direction, and the second gear 4 is unidirectionally connected to the rear wheel axle 12 on the frame 1 through the ratchet 41.

[0047] In this embodiment, the second gear 4 is unidirectionally connected to the rear wheel axle 12 on the frame 1 via a ratchet 41, eliminating the need for a separate freehub base and saving on freehub base costs.

[0048] In some embodiments, the frame 1 is provided with a gearbox, and the drive shaft 11 is the output shaft of the gearbox.

[0049] In some embodiments, the frame further includes a hub, a drive rod, an external connector, and a retaining screw;

[0050] The outer wall of the transmission rod is provided with a ratchet portion, and the outer wall of the transmission rod is fitted with a first bearing on both sides of the ratchet portion. The rear wheel axle is a key shaft. The side wall of the second gear extends with a ratchet portion. The frame has a first connecting hole and a second connecting hole. The first connecting hole is provided with a first bearing, and the second connecting hole is provided with a second bearing. The external component is provided in the first connecting hole and connected to the first bearing in the first connecting hole.

[0051] The rear wheel axle passes sequentially through the external connector, the hub's axle, the second connecting hole, and the drive rod. The rear wheel axle is circumferentially fixedly connected to both the hub and the drive rod, and the drive rod is located inside the second connecting hole. The ratchet portion is inserted into the second connecting hole and unidirectionally connected to the ratchet portion, and is connected to the second bearing inside the second connecting hole and the first bearings on both sides of the ratchet portion. The fixing screw passes through the second gear and is fixedly connected to the rear wheel axle.

[0052] Specifically, the hub is connected to the rim via multiple spokes, and an inner tube and outer tire are installed outside the rim, thus forming the rear wheel of the bicycle. To drive the hub to rotate, a connecting hole is set in the hub's axle, and a key shaft passes through the connecting hole. The rotation of the key shaft drives the hub to rotate together. The cross-section of the connecting hole is the same as the cross-section of the key shaft. The cross-section of the key shaft can be quadrilateral, pentagon, hexagon, or semi-circular, etc. This embodiment preferably uses a hexagon, as the key shaft of this shape has more balanced force and more stable torque transmission. The connection between the drive rod and the key shaft is similar to the connection between the drive rod and the hub, and will not be described again. This embodiment also includes a fixing screw. The key shaft is hollow, and the fixing screw is transmitted to the connecting key shaft from the side of the second gear to limit the axial movement between the drive rod and the key shaft. In this embodiment, a ratchet portion is provided on the transmission rod. The ratchet portion consists of an internal toothed ring located in the middle of the inner wall of a cavity extending from the side wall of the second gear. The internal toothed ring has multiple teeth that engage with the ratchet portion. The ratchet portion meshes with the second gear through forward rotation, thereby driving the transmission rod to rotate. This, in turn, drives the hub to rotate via the key shaft, thus driving the rear wheel of the bicycle. When the rear wheel of the bicycle is spinning freely, the second gear remains stationary relative to the transmission rod due to the unidirectional driving effect of the ratchet portion. Therefore, this embodiment achieves torque transmission between the hub and the drive rod by installing a key shaft inside the hub. It rationally arranges the internal space of the hub and finally sets a ratchet part on the outer wall of the drive rod to mesh unidirectionally with the internal gear ring in the second gear, so that the rotation of the second gear drives the drive rod. There is no need to set a freehub at the end of the hub to achieve torque transmission, which improves the lightweight effect of the rear wheel hub structure. Moreover, the torque transmission is achieved through the cooperation of the entire hub shaft and the key shaft, which is more stable and reliable than the traditional method of transmitting torque through a freehub. It greatly improves the torque transmission effect while reducing the installation space of components.

[0053] In some embodiments, the ratchet portion includes a ratchet seat and a plurality of pawls. The ratchet seat has a plurality of mounting grooves corresponding to the plurality of pawls. One end of the pawl is rotatably connected to the mounting groove, and the other end of the pawl can extend out of the mounting groove and engage with the internal gear ring. An elastic element is provided in the mounting groove and connected to the back of the pawl. The compression direction of the elastic element is the same as the rotation direction of the transmission rod.

[0054] In some embodiments, the frame further includes an outer sealing ring, which is mounted on the outside of the first connection hole.

[0055] In some embodiments, the present invention also provides a bicycle, the bicycle including any of the transmission systems described above.

[0056] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A transmission system for a bicycle, characterized in that, Includes the frame, belt, first gear, and second gear; The first gear is connected to the drive shaft on the frame and is located on the outside of the frame. The second gear is connected to the rear wheel axle on the frame and is located on the outside of the frame and on the same side as the first gear. The first gear and the second gear are connected by a belt. The transmission system also includes a tensioning screw, a tensioning lever, and a tensioning wheel. The tensioning lever is movably connected to the frame, the tensioning wheel is connected to one end of the tensioning lever and abuts against the belt, and the tensioning screw is connected to the other end of the tensioning lever and abuts against the frame.

2. The transmission system according to claim 1, characterized in that, At least a portion of the tooth grooves of the first gear and the second gear are provided with anti-detachment plates, and the anti-detachment plates of the first gear and the second gear are circumferentially distributed on both the inner and outer sides.

3. The transmission system according to claim 1, characterized in that, At least a portion of the tooth groove sides of the first gear and the second gear are provided with anti-detachment plates; i) The anti-detachment plates of the first gear are circumferentially distributed on both the inner and outer sides, the anti-detachment plates of the second gear are circumferentially distributed on one side, and the anti-detachment plates of the second gear are distributed only within a circumferential 180-degree range on the other side; or, ii) The anti-detachment plates of the second gear are circumferentially distributed on both the inner and outer sides, the anti-detachment plates of the first gear are circumferentially distributed on one side, and the anti-detachment plates of the first gear are distributed only within a circumferential 180-degree range on the other side.

4. The transmission system according to claim 1, characterized in that, The second gear has a ratchet on its inner side along its axial direction, and the second gear is unidirectionally connected to the rear wheel axle on the frame through the ratchet.

5. The transmission system according to claim 1, characterized in that, The vehicle frame is equipped with a gearbox, and the drive shaft is the output shaft of the gearbox.

6. The transmission system according to claim 1, characterized in that, The frame also includes hubs, drive rods, external connectors, and fixing screws; The outer wall of the transmission rod is provided with a ratchet portion, and the outer wall of the transmission rod is fitted with a first bearing on both sides of the ratchet portion. The rear wheel axle is a key shaft. The side wall of the second gear extends with a ratchet portion. The frame has a first connecting hole and a second connecting hole. The first connecting hole is provided with a first bearing, and the second connecting hole is provided with a second bearing. The external component is provided in the first connecting hole and connected to the first bearing in the first connecting hole. The rear wheel axle passes sequentially through the external connector, the hub's axle, the second connecting hole, and the drive rod. The rear wheel axle is circumferentially fixedly connected to both the hub and the drive rod, and the drive rod is located inside the second connecting hole. The ratchet portion is inserted into the second connecting hole and unidirectionally connected to the ratchet portion, and is connected to the second bearing inside the second connecting hole and the first bearings on both sides of the ratchet portion. The fixing screw passes through the second gear and is fixedly connected to the rear wheel axle.

7. The transmission system according to claim 6, characterized in that, The ratchet part includes a ratchet seat and multiple pawls. The ratchet seat has multiple mounting slots corresponding to the multiple pawls. One end of the pawl is rotatably connected to the mounting slot, and the other end of the pawl can extend out of the mounting slot and mesh with the internal tooth ring. The mounting slot is provided with an elastic element connected to the back of the pawl. The compression direction of the elastic element is the same as the rotation direction of the transmission rod.

8. The transmission system according to claim 7, characterized in that, The frame also includes an outer sealing ring, which is installed on the outside of the first connecting hole.

9. A bicycle, characterized in that, The bicycle includes the transmission system as described in any one of claims 1 to 8.

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