CN215444923U - Flywheel structure, transmission system and bicycle - Google Patents
Flywheel structure, transmission system and bicycle Download PDFInfo
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- CN215444923U CN215444923U CN202120764755.4U CN202120764755U CN215444923U CN 215444923 U CN215444923 U CN 215444923U CN 202120764755 U CN202120764755 U CN 202120764755U CN 215444923 U CN215444923 U CN 215444923U
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Abstract
The utility model relates to a flywheel structure, a transmission system and a bicycle. The flywheel structure comprises a core and gear teeth; the inner core comprises a shaft cylinder part and a fixing part, and the fixing part extends along the circumferential direction of one end of the shaft cylinder part; the gear teeth are rotatably sleeved on the shaft cylinder part; at least one part of the fixing part is exposed out of the gear teeth, a fixing hole is formed in the part, exposed out of the gear teeth, of the fixing part, and the flywheel structure is fixed on the bicycle through the fixing hole. According to the utility model, the fixing part is designed on the inner core, and the flywheel structure is fixed on the bicycle through the fixing hole on the fixing part, so that the flywheel structure can be better prevented from loosening.
Description
Technical Field
The utility model relates to the technical field of vehicles, in particular to a flywheel structure, a transmission system and a bicycle.
Background
Along with the green travel mode, the bicycle becomes a common tool for people to ride instead of walk. The flywheel is an important component of a bicycle transmission system, but the flywheel structure often has the problem of loosening and the like along with the use time.
In the prior art, in order to solve the problem of loosening of the flywheel, an inner thread is usually arranged on the flywheel, and the flywheel is screwed on other hub components through the inner thread to prevent the flywheel from loosening in the circumferential direction; in addition, the outermost end of the flywheel is provided with a clamp spring to resist the axial loosening of the flywheel. However, in the anti-loosening mode, on one hand, the installation and the disassembly are complex, on the other hand, the internal thread can loosen along with the lapse of time, and on some bicycles with compact structures, the outer end of the flywheel is not provided with a space for installing the clamp spring, so that the problem of loosening of the flywheel cannot be effectively solved.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to provide a flywheel arrangement and transmission system and bicycle that solves at least one of the problems of the prior art.
According to an aspect of the present invention, there is provided a flywheel structure for a bicycle, comprising: a core and gear teeth;
the inner core comprises a shaft cylinder part and a fixing part, and the fixing part extends along the circumferential direction of one end of the shaft cylinder part;
the gear teeth are rotatably sleeved on the shaft cylinder part;
at least one part of the fixing part is exposed out of the gear teeth, a fixing hole is formed in the part, exposed out of the gear teeth, of the fixing part, and the flywheel structure is fixed on the bicycle through the fixing hole.
Optionally, the fixing portion is annular, and an outer diameter of the fixing portion is greater than or equal to a tip circle diameter of the gear teeth.
Optionally, a sleeve portion is axially connected to the gear teeth, the sleeve portion is sleeved on the shaft cylinder portion, and one end of the sleeve portion, close to the fixing portion, abuts against the fixing portion.
Optionally, the fixing hole is provided with a chamfer.
Optionally, the number of the fixing holes is at least 3.
According to a second aspect of the present invention, there is provided a transmission system for a bicycle, comprising:
a hub assembly, a central shaft and the flywheel construction of the first aspect;
the hub assembly and the flywheel structure are rotatably sleeved on the middle shaft;
the fixing part is fixedly connected with the hub component through the fixing hole.
Optionally, the hub assembly includes a motor end cover, a mounting boss is provided on the motor end cover, a mounting hole is provided on the mounting boss, the mounting hole corresponds to the fixing hole, and the mounting hole is connected to the fixing hole through a fastener.
Optionally, an internal thread is provided in the mounting hole, and the fastener is a screw.
Optionally, a gasket is interposed between the motor end cover and the fixing portion.
Optionally, the hub assembly includes a hub, and the fixing portion is fixedly connected to the hub through the fixing hole.
According to a third aspect of the present invention, there is provided a bicycle comprising the transmission system of the second aspect.
The bicycle has the technical effects that the fixing part is designed on the inner core, and the flywheel structure is fixed on the bicycle through the fixing hole in the fixing part, so that the flywheel structure is prevented from loosening.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.
FIG. 1 illustrates a prior art flywheel attachment.
Fig. 2 is an exploded view of the flywheel construction of the present application.
Fig. 3 is a schematic side view of the flywheel construction of the present application.
Fig. 4 is a schematic front view of the flywheel structure of the present application.
Fig. 5 is a schematic view of the assembly of the core and gear teeth of the flywheel construction of the present application.
Fig. 6 is a schematic view of the core structure of the present application.
FIG. 7 is a schematic illustration of a gear tooth configuration in the present application.
FIG. 8 is a schematic of the transmission system of the present application.
Fig. 9 is a partial structure diagram of the flywheel structure fixed on the motor end cover in the application.
Description of reference numerals:
1-flywheel structure; 101-a core; 1011-shaft cylinder part; 1012-a fixed part; 1013-fixing holes; 102-gear teeth; 1021-a sleeve portion; 103-a bearing; 2-a hub assembly; 201-motor end cover; 202-mounting a boss; 2021-mounting holes; 203-a fastener; 3-the middle shaft; 4-washer.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses.
Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1, in the prior art, generally, an inner thread is disposed on a flywheel, an outer thread is disposed on a hub assembly, and the flywheel is fixed on the hub assembly by matching the inner thread and the outer thread and plays a role in blocking the circular motion of the flywheel; in addition, the outer end of the flywheel is provided with a clamp spring in a blocking mode, and the effect of blocking the axial movement of the flywheel is achieved. Wherein the hub assembly is a combination of various components mounted centrally on a central axle for supporting the tire. The hub assembly may have a variety of design variations depending on the actual bicycle design requirements. For example, in an electric bicycle, a motor end cover is generally arranged in a hub assembly to hide a motor for design attractiveness, a flywheel with internal threads is screwed on external threads of the motor end cover, a clamp spring is arranged on the outer side of the flywheel and clamped on the motor end cover, and if the flywheel loosens, the clamp spring of the motor end cover can resist the outward movement of the flywheel.
Although the above-mentioned solution theoretically solves the problem of loosening the flywheel, in practical use, it cannot be fully applied due to limitations of design space and the like. For example, due to design requirements, when a small flywheel is adopted or due to the height limitation of a motor end cover and the like, the motor end cover has no space and a clamp spring to limit the loosening of the flywheel. In addition, when the bicycle actually runs, the flywheel and the motor end cover have a motion trend of being unscrewed or screwed, and the matching of the flywheel and the threads of the motor end cover can also be screwed or unscrewed to fall off along with the progress of time, so that the service life of the flywheel is influenced.
As shown in fig. 2 to 3, according to an aspect of the present invention, there is provided a flywheel structure 1 for a bicycle, including: a core 101 and gear teeth 102; the inner core 101 includes a shaft cylinder portion 1011 and a fixing portion 1012, the fixing portion 1012 extending in a circumferential direction of one end of the shaft cylinder portion 1011; the gear teeth 102 are rotatably sleeved on the shaft cylinder part 1011; at least a portion of the fixing portion 1012 is exposed from the gear teeth 102, a fixing hole 1013 is disposed on the portion of the fixing portion 1012 exposed from the gear teeth 102, and the flywheel structure 1 is fixed on the bicycle through the fixing hole 1013.
Specifically, in the present embodiment, as shown in fig. 6, the fixing portion 1012 is designed on the inner core 101 of the flywheel structure 1, and the flywheel structure 1 can be directly fixed to the bicycle (for example, the hub assembly 2) through the fixing hole 1013 on the fixing portion 1012. The flywheel structure 1 adopts the fixing part 1012 to replace an assembly form of internal thread in the prior art, omits a loose-proof part similar to a snap spring, simplifies the structure, prevents the axial and circumferential motion of the flywheel structure 1, improves the tightness of the flywheel, and can effectively prevent the flywheel structure 1 from loosening from a bicycle. As shown in fig. 4 to 5, the fixing portion 1012 can be fixed to the hub assembly 2 in various ways, such as by fastening the fastening member 203 with a screw or the like through the fixing hole 1013 to be screwed to the hub assembly 2; the gear teeth 102 and the shaft cylinder 1011 are sleeved together, and the middle can be rotatably connected by adopting a bearing 103 or a ratchet or other connecting piece, so that the inner core 101 can rotate along with the gear teeth 102 and the hub component 2 simultaneously or only along with the hub component 2 during the driving of a bicycle. For example, when the driving force of the bicycle is from external force to pedal, the pedal transmits the driving force to the gear 102 through a chain, and the gear 102 drives the core 101 and the hub assembly 2 to rotate through a connecting member like a ratchet; when the driving force is supplied from the motor, the motor drives the hub assembly 2 to rotate, the inner core 101 rotates with the hub assembly 2, and at this time, the gear teeth 102 may not rotate therewith. The embodiment is not particularly limited in the form of fixing the fixing hole 1013 and the manner of connecting the cylindrical shaft portion 1011 and the gear teeth 102.
Alternatively, as shown in fig. 4 to 6, the fixing portion 1012 is annular, and the outer diameter of the fixing portion 1012 is greater than or equal to the addendum circle diameter of the gear tooth 102.
Specifically, the fixing portion 1012 is fixedly mounted on other components of the bicycle through the fixing hole 1013, and the gear teeth 102 are located at an outer side of the fixing portion 1012 during assembly, so that the fixing hole 1013 is exposed to the gear teeth 102 to facilitate the fixing assembly of the flywheel structure 1. Since the outer contour of the gear 102 is generally circular, the fixing portion 1012 is designed to be annular, so that the fixing hole 1013 can be maximally exposed to the gear 102 while saving space. When the outer diameter of the fixing portion 1012 is larger than the tip circle diameter of the gear 102, the fixing hole 1013 may be disposed at a position on the fixing portion 1012 exceeding the outer contour of the gear 102, without the intervention of the gear 102, so that the detachment of the core 101 may be more convenient. When the outer diameter of the fixing portion 1012 is equal to the tip circle diameter of the gear tooth 102, the outer contour of the fixing portion 1012 is as large as the outer contour of the gear tooth 102, and at this time, the fixing hole 1013 may be disposed on the fixing portion 1012 exposed to the gap between two teeth of the gear tooth 102 (refer to fig. 4), which not only saves the material cost of the inner core 101, but also facilitates the detachment of the inner core 101.
Alternatively, as shown in fig. 5 and 7, a sleeve portion 1021 is connected to the gear teeth 102 in the axial direction, the sleeve portion 1021 is fitted around the shaft cylinder portion 1011, and one end of the sleeve portion 1021 near the fixing portion 1012 abuts against the fixing portion 1012.
Specifically, since the thickness of the gear 102 is limited, when the gear 102 rotates or the inner core 101 rotates, in order to prevent the fixing portion 1012 and the gear 102 from interfering with each other, the sleeve portion 1021 is provided in the axial direction of the gear 102, so that the mutual interference between the fixing portion 1012 of the inner core 101 and the gear 102 can be prevented, and when the sleeve portion 1021 and the shaft sleeve portion 1011 are engaged with each other, the contact area between the two portions becomes large, so that the connection is more stable. In addition, the rotation of the gear teeth 102 may block a portion of the fixing hole 1013, and after the sleeve portion 1021 abuts against the fixing portion 1012, a certain gap is left between the gear teeth 102 and the fixing portion 1012, so that a portion of the fixing hole 1013 is exposed, thereby facilitating the detachment of the flywheel structure 1.
Optionally, the fixing hole 1013 is provided with a chamfer.
Specifically, the fixing hole 1013 may be a through hole, and a chamfer may be provided in the fixing hole 1013 to facilitate assembly and fastening of the fastener 203.
Alternatively, the number of the fixing holes 1013 is at least 3.
Specifically, in the present application, the fixing holes 1013 are important factors for determining whether the flywheel structure 1 is loosened, and at least 3 fixing holes 1013 are provided, that is, 3, 4 or more fixing holes may be provided. Generally, when there are 3 fixing holes 1013, the fixing holes may be arranged on the fixing portion 1012 in a triangular shape around the gear teeth 102, so that on one hand, the fastening performance may be ensured, and on the other hand, the problem of complicated assembly caused by too many fixing holes 1013 may be avoided. If there are 4 fixing holes 1013, they may be arranged uniformly on the fixing portion 1012 around the gear teeth 102. The fixing holes 1013 are uniformly arranged on the fixing portion 1012 around the gear teeth 102, and can also distribute and balance the stress of the fixing portion 1012, thereby prolonging the service life thereof.
According to a second aspect of the present invention, as shown in fig. 8, there is provided a transmission system for a bicycle, comprising: a hub assembly 2, a centre shaft 3 and the flywheel construction 1 of the first aspect; the hub component 2 and the flywheel structure 1 are rotatably sleeved on the middle shaft 3; the fixing portion 1012 is fixedly connected to the hub unit 2 through the fixing hole 1013.
Specifically, when the flywheel structure 1 in any of the above embodiments is used in a transmission system of a bicycle, the fixing portion 1012 of the core 101 may be fixedly connected to the hub assembly 2 of the bicycle. The hub unit 2 of the bicycle rotates with the wheel, and the core 101 also rotates with it. Because fixed part 1012 is fixed on wheel hub subassembly 2 through fixed orifices 1013, and axle cylinder portion 1011 and wheel hub subassembly 2 of core 101 are the rotatable cover and are established on axis 3, make flywheel structure 1 and wheel hub subassembly 2's fixed connection, both solved the loose problem that the circular motion and the axial motion of flywheel structure 1 lead to, replace the mode that directly sets up interior profile in core 101 among the prior art again, still saved and set up the design space of jump ring in the core 101 outside, improved anti-loosening effect and production efficiency simultaneously.
Optionally, as shown in fig. 9, the hub assembly 2 includes a motor cover 201, a mounting boss 202 is disposed on the motor cover 201, a mounting hole 2021 is disposed on the mounting boss 202, the mounting hole 2021 is disposed corresponding to the fixing hole 1013, and the mounting hole 2021 is connected to the fixing hole 1013 by a fastener 203.
Specifically, in order to save labor, the electric bicycle is generally used at present, and in the design of the electric bicycle, for the consideration of design beauty and space saving, the motor can be hidden in the hub assembly 2, and at this time, a part of the hub assembly 2 is changed into the motor end cover 201, so that the motor can be protected, and the motor end cover can be used for supporting wheels and the like. In this embodiment, the fixing portion 1012 of the flywheel structure 1 is directly fixed on the mounting boss 202 of the motor end cover 201, and the number and the positions of the mounting holes 2021 formed in the mounting boss 202 correspond to those of the fixing holes 1013, so that the flywheel structure is convenient to detach, and a fixing component specially designed for fixing the flywheel structure 1 is omitted.
In addition, in the prior art with the motor end cover, the motor end cover is provided with external (male) threads, the flywheel is provided with internal (female) threads, the flywheel is screwed and fixed on the motor end cover through the threads, then a clamp spring is additionally arranged on the outer side of the flywheel, the clamp spring is clamped on the motor end cover, and if the flywheel is loosened, the clamp spring of the motor end cover can resist the outward movement of the flywheel. However, due to the design, the bicycle needs to adopt a small flywheel or the height limitation of the motor end cover, so that the motor end cover has no space and is limited by adding a clamp spring to release the flywheel. And the flywheel structure 1 in this embodiment relies on the fixed part 1012 to prevent the pine from taking off with the motor end cover 201 direct fixation, need not add and establishes the jump ring, has saved the installation space of jump ring, has also avoided simultaneously adding the problem that leads to the flywheel structure 1 pine to take off when establishing the jump ring inefficacy.
Optionally, an internal thread is provided in the mounting hole 2021, and the fastener 203 is a screw.
The internal thread is arranged in the mounting hole 2021, so that the flywheel structure 1 and the motor end cover 201 can be conveniently screwed by screws, and during threaded connection, the fastening piece is generally a standard piece, so that independent design is not needed, and repeated disassembly can be realized.
Alternatively, as shown in fig. 8 to 9, a gasket 4 is interposed between the motor cover 201 and the fixing portion 1012.
Specifically, in the prior art, the flywheel is directly screwed on the motor end cover through the arranged internal thread, and the distance (chain line value) between the flywheel and the center of the frame is fixed and cannot be adjusted. If different flywheel chain line values are designed for other new vehicle types, the corresponding motor end cover needs to be opened again, and the adaptability is poor. The washers 4 in this embodiment may be selected from different thicknesses or a combination of a plurality of washers 4, so that the flywheel structure 1 in this embodiment may be directly raised or reduced in distance between the flywheel and the center of the frame (motor) by adding or subtracting the washers 4, and the motor end cover 201 does not need to be redesigned, and is good in adaptability.
Optionally, the hub assembly 2 comprises a hub, and the fixing portion 1012 is fixedly connected to the hub through the fixing hole 1013.
The hub is an important component of the hub unit 2 and can be used to connect some other parts of the hub unit 2. In some manual bicycles, without the motor, the motor end cap 201 may be deformed as part of the hub. The fixing portion 1012 is fixedly connected with the hub, so that the anti-loosening effect of the flywheel structure 1 can be achieved without additionally arranging the inner thread of the inner core 101 and the clamp spring structure.
According to a third aspect of the present invention, there is provided a bicycle comprising the transmission system of the second aspect.
The bicycle in this embodiment may include a shared bicycle and other bicycles, or a shared moped and other bicycles, and any vehicle type that can use the transmission system of the flywheel structure 1 in this application may be included in this embodiment, which is not limited in this application. Compared with the prior art, the bicycle adopting any one of the flywheel structures 1 in the above embodiments or the transmission system comprising the flywheel structure 1 has the advantages that the flywheel structure 1 is not easy to loosen, and complicated design procedures and redundant structures are omitted.
In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.
Claims (11)
1. A flywheel construction for a bicycle, comprising: a core and gear teeth;
the inner core comprises a shaft cylinder part and a fixing part, and the fixing part extends along the circumferential direction of one end of the shaft cylinder part;
the gear teeth are rotatably sleeved on the shaft cylinder part;
at least one part of the fixing part is exposed out of the gear teeth, a fixing hole is formed in the part, exposed out of the gear teeth, of the fixing part, and the flywheel structure is fixed on the bicycle through the fixing hole.
2. The flywheel structure of claim 1, wherein the fixing portion is annular, and an outer diameter of the fixing portion is greater than or equal to an addendum circle diameter of the gear teeth.
3. The flywheel structure according to claim 2, wherein a sleeve portion is axially connected to the gear teeth, the sleeve portion is fitted over the shaft tube portion, and one end of the sleeve portion close to the fixing portion abuts against the fixing portion.
4. The flywheel structure of claim 1, wherein the fixing hole is provided with a chamfer.
5. The flywheel structure of claim 1, wherein the number of the fixing holes is at least 3.
6. A transmission system for a bicycle, comprising:
a hub assembly, a central axle and a flywheel construction as claimed in any one of claims 1 to 5;
the hub assembly and the flywheel structure are rotatably sleeved on the middle shaft;
the fixing part is fixedly connected with the hub component through the fixing hole.
7. The transmission system according to claim 6, wherein the hub assembly includes a motor end cover, a mounting boss is disposed on the motor end cover, a mounting hole is disposed on the mounting boss, the mounting hole corresponds to the fixing hole, and the mounting hole is connected to the fixing hole through a fastener.
8. The transmission system according to claim 7, wherein the mounting hole is internally threaded and the fastener is a screw.
9. The transmission system according to claim 7, wherein a washer is interposed between the motor end cover and the fixing portion.
10. The transmission system according to claim 6, wherein the hub assembly includes a hub, and the fixing portion is fixedly connected to the hub through the fixing hole.
11. A bicycle comprising a transmission system according to any one of claims 6 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120764755.4U CN215444923U (en) | 2021-04-14 | 2021-04-14 | Flywheel structure, transmission system and bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120764755.4U CN215444923U (en) | 2021-04-14 | 2021-04-14 | Flywheel structure, transmission system and bicycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215444923U true CN215444923U (en) | 2022-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120764755.4U Active CN215444923U (en) | 2021-04-14 | 2021-04-14 | Flywheel structure, transmission system and bicycle |
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| Country | Link |
|---|---|
| CN (1) | CN215444923U (en) |
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2021
- 2021-04-14 CN CN202120764755.4U patent/CN215444923U/en active Active
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