Multi-pawl rotating type flywheel structure for bicycle

Abstract

The multi-pawl rotating type flywheel structure for the bicycle comprises a hub body, an inner gear sleeve, an inner core and a flywheel, the inner core is in threaded connection with the hub body, a plurality of pawls and elastic pieces are arranged on the outer wall of the inner core in the circumferential direction, the inner core is arranged in the inner gear sleeve in a sleeved mode, and the inner core and the inner gear sleeve can rotate relatively. A gear ring is fixedly arranged on the inner wall of the inner gear sleeve, the pawl is meshed with the gear ring, and the flywheel is arranged on the inner gear sleeve in a sleeving mode and can rotate synchronously with the inner gear sleeve. When the bicycle advances, the pawl is clamped on the gear ring, and the flywheel can drive the inner gear sleeve, the inner core and the hub body to rotate. After the flywheel stops rotating, the hub body continues to rotate due to inertia, at the moment, the inner gear sleeve and the inner core rotate relatively, and the pawl and the gear ring rotate mutually. According to the utility model, the bicycle can be driven by connecting the inner core and the inner gear sleeve, the structure between the inner core and the inner gear sleeve is simple, the installation process is also simple and convenient, and the production and maintenance cost can be greatly saved.

Description

Technical Field

[0001] This utility model relates to the field of bicycle parts technology, and in particular to a multi-pawl spiral flywheel structure for bicycles. Background Technology

[0002] Bicycles are an important means of transportation for short-distance travel. In the structure of a bicycle, the transmission mechanism is used to drive the bicycle. The freewheel structure is a crucial component for transmitting power and propelling the bicycle. The freewheel structure includes a freewheel and a hub connected to it. A freehub is located between the freewheel and the hub. The freewheel connects to the bicycle chain, the hub connects to the spokes, and the freehub connects to the hub. The rotation of the freewheel drives the freehub and hub, thus propelling the bicycle. However, the freehub structures currently on the market are quite complex and have high production costs. For example, the freehub disclosed in patent application number CN2023236389233 contains a bearing. Over time, sludge will accumulate inside the bearing, affecting its normal rotation and lifespan. Furthermore, the bearing needs to be replaced when damaged. Due to the complex structure of the freehub, bearing replacement is cumbersome and inconvenient. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing a multi-pawl rotary flywheel structure for bicycles.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0005] A multi-pawl spiral freewheel structure for bicycles includes a freewheel with a socket in the middle.

[0006] The inner gear sleeve has a cylindrical structure and a gear ring is fixedly installed inside it. The inner gear sleeve is inserted into the socket of the flywheel.

[0007] The inner core is rotatably disposed within the inner gear sleeve. One end of the inner core is provided with an internal thread, and the other end is provided with an external thread. A fixing cover ring is threadedly connected to the end of the inner core with the external thread, and the fixing cover ring is located inside the inner gear sleeve.

[0008] Multiple pawls are provided and are evenly arranged on the outer wall of the inner core along the circumferential direction, and mesh with the toothed ring;

[0009] Multiple spring clips are evenly arranged on the outer wall of the inner core along the circumferential direction, and abut against the pawl to squeeze the pawl to rotate outward.

[0010] The hub body has an external thread at one end, which is threaded to the end of the inner core that has an internal thread.

[0011] Preferably, the hub body includes a connecting shaft, two connecting discs are symmetrically fixed on the connecting shaft, and connecting blocks are fixed at both ends of the connecting shaft. The connecting blocks are provided with external threads and are used to connect with the inner core thread.

[0012] Preferably, the outer wall of the inner gear sleeve is provided with a plurality of protruding limiting strips along the circumferential direction, the flywheel is provided with an insertion hole in the middle, the inner wall of the insertion hole is provided with a plurality of matching limiting grooves along the circumferential direction, and the limiting strips are engaged in the limiting grooves.

[0013] Preferably, the outer wall of the inner core is provided with a pawl groove and a spring clip groove. One end of the pawl is rotatably disposed in the pawl groove, and the other end extends to the outside of the inner core. One end of the spring clip is fixedly disposed in the spring clip groove, and the other end abuts against the side wall of the pawl.

[0014] Preferably, the pawl has multiple ratchet teeth on the side away from the spring piece, and the ratchet teeth are adapted to the toothed ring.

[0015] Preferably, an annular groove is formed on the outer wall of the inner core, and a steel wire is inserted into the annular groove to limit the pawl and the spring piece.

[0016] Preferably, a limiting sleeve is fixedly provided inside the inner toothed sleeve, the inner core is rotatably disposed inside the limiting sleeve, and the fixing cover ring abuts against one end of the limiting sleeve.

[0017] Preferably, one end of the limiting sleeve has an arc-shaped structure, and one side of the fixing cover ring is provided with a corresponding arc-shaped sliding groove, with one end of the limiting sleeve located in the arc-shaped sliding groove of the fixing cover ring.

[0018] Preferably, the fixing cover ring has at least two locking holes on the side away from the inner core.

[0019] The beneficial effects of adopting the above technical solution are as follows:

[0020] 1. In this utility model, the hub body and the flywheel are connected by an inner gear sleeve and an inner core. The inner core is rotatably disposed in the inner gear sleeve. The inner gear sleeve is fixedly connected to the flywheel, and the inner core is connected to the hub body. This makes the structure simpler, thereby reducing production costs, reducing the use of bearings, reducing the failure rate of components, and saving maintenance costs.

[0021] 2. In this utility model, the ratchet teeth on the pawl will produce a sound during the contact and meshing process with the toothed ring. The pawl is provided with multiple ratchet teeth, so that more sounds can be produced during the rotation of the toothed ring, making the sound more continuous and avoiding sound jamming, which would affect the user experience. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the main body of the flower drum of this utility model;

[0023] Figure 2 This is a three-dimensional schematic diagram of the flywheel of this utility model;

[0024] Figure 3 This is a three-dimensional schematic diagram of the inner toothed sleeve of this utility model;

[0025] Figure 4 This is a sectional view of the inner toothed sleeve of this utility model;

[0026] Figure 5 This is a three-dimensional schematic diagram of the inner core of this utility model;

[0027] Figure 6 This is a three-dimensional schematic diagram of the inner core of this utility model from another angle;

[0028] Figure 7 This is a three-dimensional schematic diagram of the fixing cover ring of this utility model;

[0029] Figure 8 This is a top view of the fixing cover ring of this utility model.

[0030] In the diagram: 1 is the hub body, 2 is the inner gear sleeve, 3 is the gear ring, 4 is the inner core, 5 is the fixing cover ring, 6 is the pawl, 7 is the spring, 8 is the freewheel, 9 is the connecting shaft, 10 is the connecting plate, 11 is the connecting block, 12 is the limiting strip, 13 is the pawl slot, 14 is the spring slot, 15 is the ratchet tooth, 16 is the limiting sleeve, and 17 is the locking hole. Detailed Implementation

[0031] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] like Figures 1 to 8 As shown, a multi-pawl spiral freewheel structure for bicycles includes a hub body 1, an inner gear sleeve 2, an inner core 4, and a freewheel 8. The hub body 1 has a through-hole in the middle for rotatable connection to the bicycle frame. The connection method between the hub body 1 and the bicycle is existing technology and will not be described further here. One end of the hub body 1 has an external thread. The inner core 4 is a cylindrical structure with an internal thread at one end, which is threaded to the externally threaded end of the hub body 1. The other end of the inner core 4 has an external thread. Multiple pawls 6 and multiple spring clips 7 are evenly arranged circumferentially on the outer wall of the inner core 4. One end of each pawl 6 is rotatably mounted on the inner core 4. The other end of the pawl 6 extends to the outside of the inner core 4. One end of the spring piece 7 is fixedly set on the outer wall of the inner core 4, and the other end of the spring piece 7 abuts against the side wall of the pawl 6 to squeeze the pawl 6 to rotate outward of the inner core 4. The inner toothed sleeve 2 is sleeved on the outside of the inner core 4. The inner toothed sleeve 2 and the inner core 4 are rotatably connected. The inner toothed sleeve 2 is a cylindrical structure. The inner core 4 has an external thread at one end, which is threaded to a fixing cover ring 5. The fixing cover ring 5 can limit the inner core 4 and prevent the inner core 4 from coming off the inner toothed sleeve 2. A toothed ring 3 is fixedly set inside the inner toothed sleeve 2. The toothed ring 3 meshes with the pawl 6 on the inner core 4. The flywheel 8 is fixedly set on the inner toothed sleeve 2 and can rotate synchronously with the inner toothed sleeve 2.

[0035] In traditional hub structures, the hub is connected to the freehub, and the freewheel is fixedly mounted on the freehub. However, the freehub structure is relatively complex, installation is cumbersome, and bearings are easily damaged, resulting in high maintenance costs. Furthermore, the hub connected to the freehub must be made of aluminum, which also increases production costs. In this invention, during installation, the inner core 4 is first fitted into the inner gear sleeve 2, allowing the pawl 6 to engage with the gear ring 3. Then, the fixing cap ring 5 is threadedly fixed to the inner core 4, securing it within the inner gear sleeve 2 and preventing it from detaching. Subsequently, the inner core 4 is threadedly fixed to the hub body 1. Finally, the freewheel 8 is fixed to the outer circumference of the inner gear sleeve 2. The installation process is simple and convenient, with a simpler structure, fewer parts, and reduced bearing usage. This reduces maintenance and production costs. During use, the hub body 1 is rotatably mounted on the frame and fixedly connected to the wheel. The freewheel 8 is connected to the chain. During normal riding, the freewheel 8 drives the inner gear sleeve 2 to rotate. At this time, the pawl 6 is engaged on the gear ring 3, so the inner gear sleeve 2 can drive the inner core 4 to rotate synchronously. Since the inner core 4 is fixedly connected to the hub body 1, the hub body 1 also rotates, driving the wheel to rotate, allowing the bicycle to ride normally. After the freewheel 8 stops rotating, the hub body 1 and the inner core 4 continue to rotate, while the inner gear sleeve 2 and the freewheel 8 stop rotating. When the gear ring 3 rotates, it can squeeze the pawl 6, causing the pawl 6 to rotate to one side of the inner core 4, and at the same time squeeze the spring 7, causing the spring 7 to deform. During the rotation, the pawl 6 and the gear ring 3 collide, thus producing a sound.

[0036] It should be noted that a retaining ring is provided at the end of the inner core 4 away from the fixing cover ring 5. The diameter of the retaining ring is larger than the diameter of the inner core 4. Therefore, after the inner core 4 is inserted into the inner gear sleeve 2, the retaining ring can abut against one end of the inner gear sleeve 2, and relative rotation can occur between the retaining ring and the inner gear sleeve 2. At the same time, the other end of the inner core 4 is threadedly connected to the fixing cover ring 5. The fixing cover ring 5 and the retaining ring abut against the two ends of the inner gear sleeve 2 respectively, thereby limiting the inner core 4 and preventing the inner core 4 from moving around in the inner gear sleeve 2.

[0037] In another embodiment, both ends of the hub body 1 are provided with external threads, and the inner core 4 is threadedly connected to one end of the hub body 1. Since both ends of the hub body 1 are provided with external threads, the two ends of the hub body 1 can be interchanged.

[0038] Furthermore, such as Figure 1 As shown, the hub body 1 includes a connecting shaft 9, on which two connecting discs 10 are symmetrically fixed. The connecting discs 10 are used to fix the spokes of the wheel, thereby fixing the wheel to the hub body 1. Connecting blocks 11 are fixedly provided at both ends of the connecting shaft 9. The connecting blocks 11 are cylindrical structures with external threads. The connecting blocks 11 are used to thread the inner core 4.

[0039] Furthermore, such as Figure 3 and Figure 4 As shown, the inner gear sleeve 2 has multiple protruding limiting strips 12 along the circumferential direction on its outer wall. The flywheel 8 has an insertion hole in the middle, and the inner wall of the insertion hole has multiple matching limiting grooves along the circumferential direction. When the flywheel 8 is connected to the inner gear sleeve 2, the inner gear sleeve 2 is inserted into the insertion hole in the middle of the flywheel 8, and the limiting strips 12 are locked in the limiting grooves. When the flywheel 8 drives the inner gear sleeve 2 to rotate, the limiting strips 12 can play a limiting role, so that the flywheel 8 and the inner gear sleeve 2 rotate synchronously.

[0040] Furthermore, such as Figure 5 and Figure 6 As shown, the outer wall of the inner core 4 is provided with multiple pawl slots 13 and multiple spring slots 14. Both the pawl slots 13 and the spring slots 14 are circular structures. The pawl slots 13 and the spring slots 14 are respectively provided with notches for the pawl 6 and the spring 7 to extend out. One end of the pawl 6 is rotatably disposed in the pawl slot 13, and the other end extends out from the notch of the pawl slot 13 and extends to the outside of the inner core 4 and meshes with the toothed ring 3. One end of the spring 7 is fixedly disposed in the spring slot 14, and the other end extends out from the notch of the spring slot 14 and abuts against the side wall of the pawl 6. In this embodiment, since the spring piece 7 presses the pawl 6 so that one end of the pawl 6 is located outside the inner core 4, the pawl 6 can always mesh with the toothed ring 3 when the inner toothed sleeve 2 and the inner core 4 rotate synchronously. During the relative rotation between the inner toothed sleeve 2 and the inner core 4, the toothed ring 3 can press the pawl 6 to rotate towards the side closer to the inner core 4, thereby pressing the spring piece 7.

[0041] Furthermore, the side of the pawl 6 away from the spring 7 is provided with multiple ratchet teeth 15, which are adapted to the toothed ring 3. In this embodiment, the inner toothed ring 3 is provided with 60 teeth, and the side of the pawl 6 is provided with 2 ratchet teeth 15. Therefore, the inner toothed ring 3 and the pawl 6 can generate 120 jumps in one rotation, and a sound is produced at the same time. The 120 jumps per rotation are relatively dense, so the sound is also relatively continuous and there will be no large sense of jamming, thereby improving the user experience.

[0042] Furthermore, an annular groove is provided on the outer wall of the inner core 4, and a steel wire is inserted in the annular groove to limit the pawl 6 and the spring piece 7.

[0043] More specifically, the inner core 4 is divided into a connecting part and a locking part. The connecting part is provided with external threads, and the connecting part is threadedly connected to the fixing cover ring 5. The diameter of the connecting part is smaller than the diameter of the locking part. An annular groove is opened between the connecting part and the locking part. The pawl groove 13 and the spring plate groove 14 are opened on the side of the locking part near the connecting part. Therefore, the pawl 6 and the spring plate 7 can be pushed into the pawl groove 13 and the spring plate groove 14 from one side of the locking part. In order to prevent the pawl 6 and the spring plate 7 from coming out of the pawl groove 13 and the spring plate groove 14, after the pawl 6 and the spring plate 7 are inserted, the steel wire is wound in the annular groove so that the steel wire abuts against one side of the pawl 6 and the spring plate 7, thereby limiting and locking the pawl 6 and the spring plate 7.

[0044] Furthermore, such as Figure 4 As shown, a limiting sleeve 16 is fixedly installed inside the inner toothed sleeve 2. The limiting sleeve 16 is coaxially arranged with the inner toothed sleeve 2. The inner core 4 is rotatably installed inside the limiting sleeve 16. The fixing cover ring 5 abuts against one end of the limiting sleeve 16.

[0045] Furthermore, one end of the limiting sleeve 16 has an arc-shaped structure, and one side of the fixing cover ring 5 is provided with a corresponding arc-shaped groove. One end of the limiting sleeve 16 is located in the arc-shaped groove of the fixing cover ring 5, and the fixing cover ring 5 and one end of the limiting sleeve 16 can rotate relative to each other, so that the fixing cover ring 5 can rotate synchronously when the inner core 4 rotates in the limiting sleeve 16.

[0046] Furthermore, such as Figure 8 As shown, the fixing cover ring 5 is provided with at least two locking holes 17 on the side away from the inner core 4. The locking holes 17 can be used to lock the fixing cover ring 5. A special tool is inserted into the locking hole 17, and the fixing cover ring 5 and the inner core 4 are threadedly connected and locked by rotating the special tool.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-pawl spiral flywheel structure for bicycles, characterized in that, Includes a flywheel (8), wherein the flywheel (8) has a socket in the middle; The inner gear sleeve (2) is a cylindrical structure with a gear ring (3) fixedly installed inside. The inner gear sleeve (2) is inserted into the insertion hole of the flywheel (8). The inner core (4) is rotatably disposed inside the inner gear sleeve (2). One end of the inner core (4) is provided with an internal thread, and the other end is provided with an external thread. The end of the inner core (4) with the external thread is threadedly connected to a fixing cover ring (5), which is located inside the inner gear sleeve (2). Multiple pawls (6) are provided and are evenly arranged on the outer wall of the inner core (4) along the circumferential direction, and mesh with the toothed ring (3); Multiple spring clips (7) are provided and are evenly arranged on the outer wall of the inner core (4) along the circumferential direction, and abut against the pawl (6) to squeeze the pawl (6) to rotate outward; The hub body (1) has an external thread at one end, which is threaded to the end of the inner core (4) that has an internal thread.

2. The multi-pawl spiral flywheel structure for bicycles according to claim 1, characterized in that, The hub body (1) includes a connecting shaft (9), on which two connecting discs (10) are symmetrically fixed. Connecting blocks (11) are fixed at both ends of the connecting shaft (9). The connecting blocks (11) are provided with external threads and are used to connect with the inner core (4) by threads.

3. The multi-pawl spiral flywheel structure for bicycles according to claim 1, characterized in that, The outer wall of the inner gear sleeve (2) is provided with a plurality of protruding limiting strips (12) along the circumferential direction. The flywheel (8) has an insertion hole in the middle. The inner wall of the insertion hole has a plurality of matching limiting grooves along the circumferential direction. The limiting strips (12) are engaged in the limiting grooves.

4. The multi-pawl spiral flywheel structure for bicycles according to claim 1, characterized in that, The outer wall of the inner core (4) is provided with a pawl groove (13) and a spring clip groove (14). One end of the pawl (6) is rotatably disposed in the pawl groove (13), and the other end extends to the outside of the inner core (4). One end of the spring clip (7) is fixedly disposed in the spring clip groove (14), and the other end abuts against the side wall of the pawl (6).

5. The multi-pawl spiral flywheel structure for bicycles according to claim 4, characterized in that, The pawl (6) has multiple ratchet teeth (15) on the side away from the spring (7), and the ratchet teeth (15) are adapted to the toothed ring (3).

6. The multi-pawl spiral flywheel structure for bicycles according to claim 4, characterized in that, An annular groove is provided on the outer wall of the inner core (4), and a steel wire is inserted in the annular groove to limit the pawl (6) and the spring piece (7).

7. The multi-pawl spiral flywheel structure for bicycles according to claim 1, characterized in that, A limiting sleeve (16) is fixedly installed inside the inner toothed sleeve (2), and the inner core (4) is rotatably installed inside the limiting sleeve (16). The fixing cover ring (5) abuts against one end of the limiting sleeve (16).

8. The multi-pawl spiral flywheel structure for bicycles according to claim 7, characterized in that, One end of the limiting sleeve (16) is an arc-shaped structure, and one side of the fixing cover ring (5) is provided with a corresponding arc-shaped groove. One end of the limiting sleeve (16) is located in the arc-shaped groove of the fixing cover ring (5).

9. A multi-pawl spiral flywheel structure for bicycles according to claim 1, characterized in that, The fixing cover ring (5) has at least two locking holes (17) on the side away from the inner core (4).

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