Bicycle speed changing mechanism

Abstract

The present invention discloses a bicycle speed change mechanism, including a power input mechanism, which includes a middle shaft; and a driving wheel group, the driving wheel group includes a speed change wheel and a fixed wheel, the speed change wheels are coaxially arranged with the middle shaft, the transmission ratio of the fixed wheel is smaller than the transmission ratio of the speed change wheel, the fixed wheel is fixedly connected to the middle shaft, and the speed change wheel can rotate relative to the middle shaft; and a clutch mechanism, which includes a synchronous structure arranged on each of the speed change wheels, and a blocking mechanism that can rotate with the middle shaft, the blocking mechanism can block or give way to the synchronous structure on the speed change wheel when rotating through movement. The present application has a simple structure and low cost. The blocking mechanism and the synchronous structure in the clutch mechanism cooperate to synchronize or separate the speed change wheel with the middle shaft, so that the switching between the fixed wheel and different speed change wheels is realized when the middle shaft inputs power, thereby changing the transmission ratio to change the speed.

Description

Technical Field

[0001] The invention belongs to the field of bicycle speed changing mechanisms, and in particular relates to a bicycle speed changing mechanism. Background Art

[0002] In the existing variable speed bicycles, most of them realize the conversion of different speeds by setting a set of chainrings on the rear wheel shaft and / or the middle shaft, and then adding rear pullers and / or front pullers, and one set of finger pullers or two sets of finger pullers. However, this type of variable speed bicycle is not only expensive and complex in structure, but also easy to lose the chain. Except for professional road bicycle competitions or mountain cross-country special occasions, more transmission ratios are needed to achieve speed and climbing changes. In general occasions, more simple climbing and flat road riding are needed, so it is necessary to design a simple and reliable variable speed bicycle. The above problems are technical problems that need to be solved in this field. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a bicycle speed change mechanism, which has a simple structure and can easily switch the speed ratio for speed change.

[0004] The technical solution of the present invention to solve the above technical problem is as follows: A bicycle speed change mechanism includes a power input mechanism, which includes a middle shaft; and

[0005] A driving wheel set, the driving wheel set comprising a speed-changing wheel and a fixed wheel, the speed-changing wheels are coaxially arranged with the central axis, the transmission ratio of the fixed wheel is smaller than the transmission ratio of the speed-changing wheel, the fixed wheel is fixedly connected to the central axis, and the speed-changing wheel can rotate relative to the central axis; and

[0006] The clutch mechanism comprises a synchronous structure arranged on each of the speed-changing wheels, and a blocking mechanism which can rotate with the central shaft, wherein the blocking mechanism can block or give way to the synchronous structure on the speed-changing wheel when rotating.

[0007] The beneficial effects of the bicycle speed change mechanism disclosed in the present application are as follows: the present application has a simple structure, and the blocking mechanism and the synchronization structure in the clutch mechanism cooperate to synchronize or separate the speed change wheel with the middle shaft, so that when the middle shaft inputs power, switching between the fixed wheel and the different speed change wheels is achieved, thereby changing the transmission ratio for speed change.

[0008] In an optional embodiment, the power input mechanism further includes a rotating shaft and a plurality of flywheels sleeved on the rotating shaft, the flywheels corresponding one-to-one to the fixed wheel and the variable speed wheel, and the fixed wheel and the variable speed wheel are used to drive the corresponding flywheels to rotate.

[0009] In an optional embodiment, the middle shaft is connected to the crank, the synchronization structure includes a protrusion arranged on the side of the speed change wheel close to the crank, the blocking mechanism includes a guide member arranged on the crank and a blocking member slidably engaged with the guide member, and the blocking member can block or give way to the protrusion by sliding.

[0010] In an optional embodiment, the guide member is fixed to the crank along the radial direction of the speed change wheel, the blocking member can slide along the radial direction of the speed change wheel, the blocking member includes a blocking area and a yield area opened on the blocking area, and the blocking member can slide to place the protrusion on the rotation path of the blocking area or the yield area.

[0011] In an optional embodiment, a positioning mechanism is further included, and the positioning mechanism is used to position the blocking member to a position where it can block the protrusion.

[0012] In an optional embodiment, the positioning mechanism includes a slide groove, a positioning groove, and a positioning block arranged on the blocking member, and the positioning block is slidably matched with the slide groove. Each time the blocking member slides back and forth along the guide member, the positioning block can switch between the slide groove and the positioning groove. When the positioning block is located in the positioning groove, the blocking member blocks the protrusion.

[0013] In an optional embodiment, a reset mechanism is further included. When the positioning block is located in the slide groove, the reset member is used to drive the blocking member to give way to the protrusion. When the positioning block is located in the positioning groove, the reset mechanism is used to support the blocking member.

[0014] The present application provides positioning grooves and sliding grooves, and provides protrusions on the blocking member, and the protrusions cooperate with the positioning grooves and sliding grooves so that the protrusions stay in the positioning grooves and sliding grooves, and then block or give way to the protrusions.

[0015] In an optional embodiment, the positioning groove deviates from the sliding groove, and the positioning block is hinged to the guide member through a rocker rod.

[0016] In an optional embodiment, the speed-changing wheels include multiple ones, the transmission ratios of the speed-changing wheels are different, the synchronization structures on the speed-changing wheels do not interfere with each other, and the blocking mechanism can be movable to block or give way to the synchronization structures on each speed-changing wheel during rotation.

[0017] In an optional embodiment, each of the speed change wheels is provided with a speed change shaft protruding toward the blocking mechanism, the speed change shafts are rotatably sleeved with each other, and the synchronization mechanism on each of the speed change wheels is provided on the corresponding speed change shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall exploded view of an embodiment of the present application;

[0019] Figure 2 This is an assembly diagram of an embodiment of the present application;

[0020] Figure 3 This is an assembly diagram of the embodiment of the present application without a chain;

[0021] Figure 4 This is a schematic diagram of a fixed wheel and a clutch mechanism in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of a single speed-changing wheel in an embodiment of the present application;

[0023] Figure 6 This is a schematic diagram of a blocking member in an embodiment of the present application;

[0024] Figure 7 This is a schematic diagram of the fixed wheel in operation in an embodiment of the present application;

[0025] Figure 8 for Figure 7 The enlarged schematic diagram at A in the middle;

[0026] Fig. 9 This is a schematic diagram of the speed change wheel in operation in an embodiment of the present application;

[0027] Fig.10 for Fig. 9 The enlarged schematic diagram at A in the middle;

[0028] Fig.11 A schematic diagram of linking the speed-changing wheels in an embodiment with multiple speed-changing wheels;

[0029] Description of reference numerals:

[0030] 11. Middle shaft; 12. Flywheel; 13. Chain; 14. Crank;

[0031] 21. speed-changing wheel; 211. speed-changing wheel shaft; 22. fixed wheel;

[0032] 31. Bump; 32. Guide member; 33. Blocking member; 34. Slide groove; 35. Positioning groove; 36. Positioning block; 37. Rocker arm. DETAILED DESCRIPTION

[0033] The principles and features of the present application are described below in conjunction with the accompanying drawings and embodiments. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0034] The following discloses a variety of different implementation methods or examples of the subject technical solution. To simplify the disclosed content, the following describes specific embodiments of one or more arrangements of each feature, but the examples are not intended to limit this specification. The first feature and the second feature subsequently recorded in the specification are connected, which may include a direct connection implementation method, or an implementation method that forms additional features. Further, it also includes using one or more other intervening features to indirectly connect or combine the first feature and the second feature with each other, so that the first feature and the second feature may not be directly connected.

[0035] like Figures 1 to 10 As shown, the present application discloses an embodiment of a bicycle speed change mechanism, including a power input mechanism, a driving wheel and a clutch mechanism.

[0036] The power input mechanism includes a central shaft 11 for mounting a crank 14, and the driving wheel includes a fixed wheel 22 and a plurality of speed-changing wheels 21, and the speed-changing wheels 21 are all coaxially arranged with the central shaft 11, wherein, Figure 1 and Figure 3 As shown, the diameter of the fixed wheel 22 is smaller than the diameters of all the speed wheels 21, that is, the transmission ratio of the fixed wheel 22 is smaller than the transmission ratio of all the speed wheels 21, and the fixed wheel 22 and the central shaft 11 are directly fixedly connected, so that the fixed wheel 22 can always rotate synchronously with the central shaft 11, and the speed wheels 21 can rotate relative to the central shaft 11. For example, a bearing is provided in the middle of the speed wheel 21, and the speed wheel 21 can be connected to the central shaft 11 through the bearing, so that when no external force is applied to the speed wheel 21, the speed wheel 21 does not rotate with the central shaft 11.

[0037] The above-mentioned clutch mechanism is used to synchronize one or more of the speed wheels 21 with the central axis 11. Specifically, the clutch mechanism includes a synchronization structure installed on each speed wheel 21, and a blocking mechanism that can rotate with the central axis 11. The blocking mechanism can block or give way to the synchronization structure on the speed wheel 21 during rotation through movement.

[0038] When the number of the above-mentioned speed wheels 21 is more than two, the transmission ratio of each speed wheel 21 is different, and the blocking mechanism can block or give way to the synchronization structure on each speed wheel 21 respectively during rotation through movement, that is, in some examples, the blocking mechanism can block or give way to only any one of the speed wheels 21 through movement.

[0039] When applying this application to a bicycle, Figure 1 and Figure 2As shown, the power input mechanism may also include a rotating shaft and a plurality of flywheels 12 sleeved on the rotating shaft. For example, the rotating shaft may be the axle of the bicycle itself, or a rotating shaft separately arranged between the wheel rotating shaft and the middle shaft. The rotating shaft is connected to the flywheel 12 on the bicycle wheel shaft through a chain. The flywheel 12 on the rotating shaft as the power input mechanism corresponds to the fixed wheel 22 and the speed-changing wheel 21 one by one. The fixed wheel 22 and the speed-changing wheel 21 are used to drive the corresponding flywheel 12 to rotate. For example, the flywheel 12 may be connected to the corresponding fixed wheel 22 or speed-changing wheel 21 through a chain 13, a gear or a self-engaging method. When one or more speed-changing wheels 21 rotate with the middle shaft, due to the existence of the flywheel 12, the speed-changing wheel 21 and the fixed wheel 22 with a smaller transmission ratio will drive the corresponding flywheel 12 to rotate idly, thereby not affecting the rotation of the rotating shaft driven by the speed-changing wheel 21 with a larger transmission ratio.

[0040] In order to explain the present application, some more specific embodiments are provided below to illustrate the present application.

[0041] In some examples, such as Figures 3 to 10 As shown, the middle shaft 11 is connected to the crank 14, wherein the synchronization structure includes a protrusion 31 fixed to the side of the speed change wheel 21 close to the crank 14, when the speed change wheel 21 includes multiple, the protrusion 31 also includes multiple, the blocking mechanism includes a guide member 32 arranged on the crank 14 and a blocking member 33 slidably matched with the guide member 32, and the blocking member 33 can block or give way to the protrusion 31 by sliding. More specifically, the guide member 32 is fixed to the crank 14 along the radial direction of the speed change wheel 21, and the blocking member 33 can slide along the radial direction of the speed change wheel 21. A blocking area is provided on the blocking member 33, and a giving way area is opened on the blocking area. By sliding the blocking member 33 , so that the protrusion is in the rotation path of the blocking area or the yielding area, thereby blocking or yielding the protrusion 31. For example, the above-mentioned guide member 32 can be a sleeve fixed on the crank 14 and extending along the speed change wheel diameter 21. The blocking member 33 is a blocking rod slidably sleeved in the sleeve. A notch is provided on the blocking rod as the yielding area. The notch can be staggered or opposite to the protrusion 31 by sliding the blocking rod, thereby blocking or yielding the protrusion 31. In an embodiment with multiple speed change wheels 21, the protrusions 31 on each speed change wheel 21 are arranged from small to large in the radial direction from the central axis 11 to the outside according to the transmission ratio. In order to prevent the speed change wheels 21 from interfering with each other, such as Fig.11As shown, the speed wheel 21 is provided with a speed shaft 211 protruding toward the crank, and each speed shaft 211 is sleeved with each other through bearings, so that each speed wheel 21 and the speed shaft 211 can rotate relatively. Considering the large size of the speed wheel with a large transmission ratio, in a specific example, the speed wheels 21 can be sleeved with bearings in order from large to small in accordance with the transmission ratio of the speed wheels 21, gradually away from the middle axis 11, wherein the protrusion 31 is provided on the side of each speed shaft 21 facing the crank 14, so that when the blocking member 33 blocks one of the protrusions 31, it will not interfere with other speed wheels 21 and the chain 13 installed on the speed wheel 21.

[0042] In addition, some embodiments also include a positioning mechanism, which is used to position the blocking member 33 to a position where it can block the protrusion 31. For example, in a more specific example, the positioning mechanism includes a slide groove 34 and a positioning groove 35 opened on the crank 14, wherein a positioning block 36 is installed on the blocking member 33, and the positioning block 36 slides and engages in the slide groove 34. When the blocking member 33 slides along the guide member 32, the slide groove 34 can guide the positioning block 36 to the positioning groove 35. When the positioning block 36 is located in the positioning groove 35, the blocking member 33 blocks or gives way to the protrusion 31.

[0043] Specifically, the positioning groove 35 deviates from the slide groove 34 at a certain angle, and the positioning block 36 can slide toward the positioning groove 35 when sliding along the slide groove 34, so as to enter the positioning groove 35. In order to allow the positioning block 36 to deviate from the slide groove 34 and enter the positioning groove 35 when sliding along the slide groove 34, the positioning block 36 is hinged to the guide member 32 through a swing rod 37. In a more specific example, as shown in FIG. Figure 4 , Figure 7 and Fig. 9 As shown, the overall structure of the slide groove 34 is arrow-shaped, and the application defines the recessed portion at the tail of the arrow as a positioning groove 35 .

[0044] It should be understood that when there are multiple speed change wheels 21, the positioning grooves 35 can also be correspondingly set to be multiple. When the positioning blocks 36 are located in different positioning grooves 35, the blocking rod can block or give way to the corresponding one or more speed change wheels 21.

[0045] In some examples, the present application further includes a reset mechanism, which can be a reset spring sleeved on the outside of the blocking member 33, and the reset spring is connected to the blocking member 33 and the guide member 32 at the same time. In the example in which the slide groove 34 is an arrow as a whole, the reset spring is used to drive the blocking member 33 away from the central axis 11, so that when the positioning block 36 is located in the slide groove 34, the reset member is used to drive the blocking member 33 to give way to the protrusion 31, and when the positioning block 36 is located in the positioning groove 35, the reset mechanism is used to support the blocking member 33.

[0046] The specific working principle of this application is as follows: Figure 8 As shown, the blocking structure in the clutch mechanism does not block or give way to synchronization. At this time, when riding, the crank 14 drives the middle shaft 11 to rotate, the middle shaft 11 drives the fixed wheel 22 to rotate, and then drives the rotating shaft to rotate. At this time, the bicycle is in a low-speed and labor-saving state. When it is necessary to increase the riding speed, such as Fig.10 As shown, by driving the clutch mechanism, the blocking mechanism blocks or gives way to the synchronization structure, so that the speed change wheel 21 is synchronized with the middle shaft 11. At this time, the speed change wheel 21 drives the middle shaft 11 to rotate, and the flywheel 12 connected to the fixed wheel 22 is idling. At this time, it is in a state of high speed that is relatively laborious. Combined with the embodiment of the present application in which the guide member 32 is a sliding sleeve and the blocking member 33 is a blocking rod, when it is necessary to switch to a high speed, the blocking rod is driven to slide along the sliding sleeve to a position where the protrusion 31 of the speed change wheel 21 can be blocked or given way. At this time, the crank 14 is rotated, and the crank The blocking rod on 14 drives the protrusion 31 to rotate, and then drives the speed wheel 21 to rotate. When there are multiple speed wheels 21, the blocking rod is used to block or give way to the protrusions 31 on different speed wheels 21, so as to achieve switching of different speeds. When it is necessary to switch to a low speed state, the blocking rod can be moved to reset it, so that the protrusion 31 on any speed wheel 21 is no longer blocked or given way. At this time, the speed wheel 21 no longer rotates with the central shaft 11, and only the fixed wheel 22 drives the rotating shaft to rotate, and the flywheel 12 connected to the speed wheel 21 is idling.

[0047] The present application has a simple structure and low cost. The blocking mechanism and the synchronization structure in the clutch mechanism cooperate to synchronize or separate the speed change wheel 21 and the middle shaft 11, so that when the middle shaft 11 inputs power, it switches between the fixed wheel 22 and different speed change wheels 21, thereby changing the transmission ratio for speed change.

[0048] In the description of this specification, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this specification.

[0049] In the description of this specification, "multiple" means at least two, such as two, three, etc., and "several" means one or more, such as one, two, etc., unless otherwise clearly and specifically defined.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] The terms used in this specification are those general terms currently widely used in the art in consideration of the functions of the present disclosure, but these terms may vary according to the intention of a person of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the specification should not be understood as simple names, but rather as an overall description based on the meaning of the terms and the present disclosure.

[0052] Flowcharts or text are used in this specification to illustrate the operation steps performed according to the embodiments of the present application. It should be understood that the operation steps in the embodiments of the present application are not necessarily performed accurately in the order of recording. On the contrary, various steps can be processed in reverse order or simultaneously as needed. At the same time, other operations can also be added to these processes, or one or more operations can be removed from these processes.

[0053] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A bicycle speed change mechanism, characterized in that: It includes a power input mechanism, which includes a middle shaft and a crank; as well as A driving wheel group, the driving wheel group includes a speed-changing wheel and a fixed wheel, the speed-changing wheels are coaxially arranged with the central axis, the transmission ratio of the fixed wheel is smaller than the transmission ratio of the speed-changing wheel, the fixed wheel is fixedly connected to the central axis, and the speed-changing wheel can rotate relative to the central axis; as well as A clutch mechanism, comprising a synchronous structure disposed on each of the speed-changing wheels, and a blocking mechanism that can rotate with the central shaft, wherein the blocking mechanism can block or give way to the synchronous structure on the speed-changing wheel when rotating; The synchronization structure includes a protrusion disposed on a side of the speed change wheel close to the crank, and the blocking mechanism includes a guide member disposed on the crank and a blocking member slidably matched with the guide member, and the blocking member can block or give way to the protrusion by sliding; The guide member is fixed to the crank in the radial direction of the speed change wheel, the blocking member can slide in the radial direction of the speed change wheel, the guide member includes a blocking area and a yielding area opened on the blocking area, and the guide member can slide to make the protrusion be located on the rotation path of the blocking area or the yielding area; The positioning mechanism is used to position the blocking member to a position where it can block the protrusion; The positioning mechanism includes a slide groove, a positioning groove, and a positioning block arranged on the blocking member, the positioning block is slidably matched with the slide groove, and the positioning block can switch between the slide groove and the positioning groove each time the blocking member reciprocates along the guide member, and when the positioning block is located in the positioning groove, the blocking member blocks the protrusion; It also includes a reset mechanism, which is used to drive the blocking member to give way to the protrusion when the positioning block is located in the sliding groove, and is used to support the blocking member when the positioning block is located in the positioning groove.

2. The bicycle speed change mechanism according to claim 1, characterized in that: The power input mechanism also includes a rotating shaft and a plurality of flywheels sleeved on the rotating shaft. The flywheels correspond to the fixed wheels and the speed-changing wheels one by one. The fixed wheels and the speed-changing wheels are used to drive the corresponding flywheels to rotate.

3. The bicycle speed change mechanism according to claim 1, wherein: The positioning groove deviates from the sliding groove, and the positioning block is hinged to the guide member through a rocker rod.

4. The bicycle speed change mechanism according to any one of claims 1 to 3, characterized in that: The transmission ratios of the speed change wheels are different, the synchronous structures on the speed change wheels do not interfere with each other, and the blocking mechanism can block or give way to the synchronous structures on the speed change wheels respectively during rotation.

5. The bicycle speed change mechanism according to claim 4, wherein: Each of the speed-changing wheels is provided with a speed-changing shaft protruding toward the blocking mechanism, and the speed-changing shafts are rotatably sleeved with each other, and the synchronization structure on each of the speed-changing wheels is provided on the corresponding speed-changing shaft.

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