A flower drum structure

Abstract

The utility model discloses a kind of flower drum structures, including flower drum axle and the flower drum shell being set on the flower drum axle, tower base and ratchet mechanism, the ratchet mechanism is set between the tower base and flower drum shell, the ratchet mechanism includes first drive ratchet and second drive ratchet, the end surface of the second drive ratchet away from the first drive ratchet is connected with the elastic member between the stepped surface being set in the flower drum shell, annular mounting groove is set on the inner wall of the tower base side of the flower drum shell, annular limiting elastic sheet is connected in the annular mounting groove, and the end surface of the first drive ratchet away from second drive ratchet is abutted with the annular limiting elastic sheet.The utility model's flower drum structure is fixed in flower drum shell by annular limiting elastic sheet, improve the reliability of flower drum structure, and the quick disassembly of ratchet mechanism can be realized by the disassembly of annular limiting elastic sheet, disassembly is convenient.

Description

Technical Field

[0001] This utility model relates to the field of bicycle accessories, specifically to a hub structure. Background Technology

[0002] As a core component connecting the wheel and frame, the bicycle hub's structural strength and durability directly affect the riding experience and safety. The ratchet mechanism inside the hub is a key component for achieving unidirectional transmission; existing hub structures are complex to disassemble and assemble, and the ratchet mechanism is easily damaged. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a hub structure that uses an annular limiting spring to fix the ratchet mechanism inside the hub shell, thereby improving the reliability of the hub structure. Furthermore, the ratchet mechanism can be quickly disassembled and assembled by removing and installing the annular limiting spring, making disassembly and assembly convenient.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A hub structure includes a hub shaft and a hub shell, a freehub, and a ratchet mechanism disposed on the hub shaft. The ratchet mechanism is disposed between the freehub and the hub shell. The ratchet mechanism includes a first drive ratchet and a second drive ratchet. The end face of the first drive ratchet is provided with a first tooth surface, and the end face of the second drive ratchet is provided with a second tooth surface that meshes with the first tooth surface. The freehub is connected to the inner circumferential surface of the second drive ratchet, and the hub shell is connected to the outer circumferential surface of the first drive ratchet. An elastic element is connected between the end face of the second drive ratchet away from the first drive ratchet and a stepped surface disposed inside the hub shell. An annular mounting groove is provided on the inner wall of the hub shell near the freehub, and an annular limiting spring is connected in the annular mounting groove. The end face of the first drive ratchet away from the second drive ratchet abuts against the annular limiting spring.

[0006] As a further improvement to the above technical solution, the elastic element is a spring, and the two ends of the spring abut against the second transmission ratchet and the stepped surface, respectively.

[0007] As a further improvement to the above technical solution, the end face of the second transmission ratchet is provided with an annular receiving groove, and the stepped surface is provided with an annular groove corresponding to the annular receiving groove. One end of the spring is accommodated in the annular receiving groove, and the other end of the spring is accommodated in the annular groove.

[0008] As a further improvement to the above technical solution, the annular limiting spring is provided with a notch, and the annular limiting spring can elastically deform inward based on the notch.

[0009] As a further improvement to the above technical solution, a shock-absorbing rubber layer is provided on the end face of the annular limiting spring near the first transmission ratchet.

[0010] As a further improvement to the above technical solution, the end face of the annular limiting spring away from the first transmission ratchet abuts against the limiting ring provided on the tower base, and a sealing groove is provided on the annular limiting spring, and a sealing ring is provided in the sealing groove.

[0011] As a further improvement to the above technical solution, a first external gear ring is provided on the outer peripheral surface of the first transmission ratchet, and a first internal gear ring is provided on the inner wall of the drum shell, wherein the first internal gear ring meshes with the first external gear ring.

[0012] As a further improvement to the above technical solution, the first external gear ring includes a first external tooth, a second external tooth, and a third external tooth. The second external tooth and the third external tooth are arranged adjacent to each other and form a first tooth groove between them. There are multiple first external teeth. A first vacant groove is formed between two adjacent first external teeth and between the first and last two first external teeth and the second external tooth and the third external tooth, respectively. The first internal gear ring includes a second tooth groove and multiple second vacant grooves. A first internal tooth is formed between the multiple second vacant grooves. A second internal tooth and a third internal tooth are formed between the second tooth groove and two adjacent second vacant grooves, respectively.

[0013] The first external gear ring and the first internal gear ring have two meshing states. When they are in one of the meshing states, one of the first external teeth engages with the second tooth groove, and at the same time, one of the first internal teeth engages with the first tooth groove.

[0014] When in another meshing state, the first external tooth, the second external tooth, and the third external tooth are all connected to the second dummy slot, while the first internal tooth, the second internal tooth, and the third internal tooth are all connected to the first dummy slot, and the first external tooth ring and the first internal tooth ring can rotate relative to each other by an angle.

[0015] As a further improvement to the above technical solution, the angle is 10-25°.

[0016] As a further improvement to the above technical solution, the inner circumferential surface of the second transmission ratchet is provided with a second internal gear ring, and the outer circumferential surface of the tower base is provided with a second external gear ring, wherein the second internal gear ring meshes with the second external gear ring.

[0017] The beneficial effects of this utility model are as follows: By setting the annular limiting spring, the ratchet mechanism can be fixed inside the hub shell, so when replacing the freehub, only the freehub needs to be removed, which facilitates the installation and removal of the freehub. When disassembling the ratchet mechanism, only the annular limiting spring needs to be removed, and then the first transmission ratchet, the second transmission ratchet, and the elastic element can be removed in sequence. Installation is done by reversing the operation. The hub structure of this utility model is simple, and both disassembly and assembly are relatively convenient. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is an exploded view of a flower drum structure according to this utility model;

[0020] Figure 2 This is a front view of a flower drum structure according to this utility model;

[0021] Figure 3 yes Figure 2 Sectional view of AA;

[0022] Figure 4 yes Figure 3 A magnified view of part A in the image;

[0023] Figure 5 This is a schematic diagram of two meshing states between the first external gear ring and the first internal gear ring in this utility model;

[0024] Figure 6 This is a cross-sectional view of the drum shell in a drum structure according to this utility model;

[0025] Figure 7 This is a schematic diagram of the internal structure of the flower drum shell in this utility model;

[0026] Figure 8 This is a schematic diagram of one side of the annular limiting spring in a flower drum structure according to this utility model;

[0027] Figure 9 This is a schematic diagram of the other side of the annular limiting spring in a flower drum structure according to this utility model;

[0028] Figure 10 This is a schematic diagram of the ratchet mechanism in a hub structure according to this utility model;

[0029] Figure 11 This is a schematic diagram of the tower base in a flower drum structure according to this utility model.

[0030] Reference numerals: 1. Hub shaft; 2. Right end cap; 3. Left end cap; 4. Hub shell; 401. Annular mounting groove; 402. Second dummy groove; 403. Second tooth groove; 404. First internal tooth; 405. Second internal tooth; 406. Third internal tooth; 407. Annular groove; 5. Freehub base; 501. Second external gear ring; 6. Annular limiting spring; 601. Notch; 602. Shock-absorbing rubber layer; 603. Sealing groove; 7. First drive ratchet; 701. First external tooth; 702. Second external tooth; 703. Third external tooth; 704. First dummy groove; 705. First tooth groove; 8. Second drive ratchet; 801. Annular receiving groove; 802. Second internal gear ring; 9. Spring. Detailed Implementation

[0031] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / connections involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. For example, fixed connections / fixed installations can use screw connections, bolt connections, pin connections, key connections, adhesive connections, mortise and tenon connections, welding, riveting, etc., as needed. For detachable connections, screw connections, bolt connections, threaded connections, snap-fit ​​connections, mortise and tenon connections, Velcro connections, etc., can be used as needed. The various technical features in this utility model can be combined interactively without contradicting each other.

[0032] Reference Figures 1-4This utility model provides a hub structure for use in mountain bikes. The hub structure includes a hub shaft 1, a hub shell 4, a freehub base 5, and a ratchet mechanism mounted on the hub shaft 1. A left end cap 3 and a right end cap 2 are respectively provided at both ends of the hub shaft 1. The left end cap 3 is connected to the freehub base 5 to seal the freehub base 5 and the hub shaft 1, while the right end cap 2 is connected to the hub shell 4 to seal the hub shell 4 and the hub shaft 1. The ratchet mechanism is located between the freehub base 5 and the hub shell 4 (the hub shell 4 has a mounting cavity for accommodating the ratchet mechanism, and the drive end of the freehub base 5 extends into the ratchet mechanism). The ratchet mechanism includes a first drive ratchet 7 and a second drive ratchet 8. The end face of the first drive ratchet 7 has a first tooth surface, and the end face of the second drive ratchet 8 has a second tooth surface that meshes with the first tooth surface. Both the first and second tooth surfaces are ratchet teeth, allowing them to rotate only in one direction. The base 5 is connected to the inner circumferential surface of the second transmission ratchet 8, and the drum shell 4 is connected to the outer circumferential surface of the first transmission ratchet 7. That is, when the first transmission ratchet 7 is stationary, rotating the base 5 will drive the second transmission ratchet 8 to rotate, thereby realizing the function of the ratchet mechanism.

[0033] In this embodiment, refer to Figure 4 The end face of the second transmission ratchet 8 away from the first transmission ratchet 7 is connected to an elastic element between it and a stepped surface provided inside the hub shell 4. An annular mounting groove 401 is provided on the inner wall of the hub shell 4 near the base 5 (see reference). Figure 6 and Figure 7 The annular mounting groove 401 is connected to an annular limiting spring 6, and the end face of the first transmission ratchet 7 away from the second transmission ratchet 8 abuts against the annular limiting spring 6. This can fix the ratchet mechanism inside the hub shell 4, improve the stability and reliability of the ratchet mechanism, and facilitate the individual disassembly and assembly of the hub base 5.

[0034] Furthermore, the elastic element is a spring 9, with both ends of the spring 9 abutting against the second transmission ratchet 8 and the stepped surface, respectively. Even further, the end face of the second transmission ratchet 8 is provided with an annular receiving groove 801, and the stepped surface is provided with an annular groove 407 corresponding to the annular receiving groove 801. One end of the spring 9 is housed in the annular receiving groove 801, and the other end of the spring 9 is housed in the annular groove 407, improving the stability of the spring 9 and facilitating disassembly and assembly.

[0035] In a specific embodiment, refer to Figure 8 and Figure 9The annular limiting spring 6 has a notch 601. Based on this notch 601, the annular limiting spring 6 can elastically deform inwards. When the annular limiting spring 6 is installed in the annular mounting groove 401, external force is applied to press the annular limiting spring 6 towards its center at the notch 601. The annular limiting spring 6 elastically deforms, reducing its outer diameter, thus allowing it to be inserted into the annular mounting groove 401. After the external force is removed, the annular limiting spring 6 elastically returns to its natural state, thus firmly connecting to the annular mounting groove 401. At this time, the portion of the annular limiting spring 6 located outside the annular mounting groove 401 can block and limit the ratchet mechanism, preventing it from falling out of the hub shell 4. In other words, during disassembly, by pulling the portion of the annular limiting spring 6 next to the notch 601 towards its center with a tool, it can elastically deform and move away from the annular mounting groove 401, thereby removing the annular limiting spring 6. Then, the first transmission ratchet 7, the second transmission ratchet 8, and the spring 9 can be removed sequentially.

[0036] In the preferred embodiment, refer to Figure 8 The annular limiting spring 6 is provided with a shock-absorbing rubber layer 602 near the end face of the first transmission ratchet 7. The shock-absorbing rubber layer 602 is made of elastic materials such as silicone, which can make the first transmission ratchet 7 and the second transmission ratchet 8 fit more tightly, making the ratchet mechanism stable and reliable.

[0037] In the preferred embodiment, refer to Figure 9 The annular limiting spring 6, facing away from the first transmission ratchet 7, abuts against the limiting ring provided on the base 5. The annular limiting spring 6 is provided with a sealing groove 603, and the sealing groove 603 is provided with a sealing ring. In this way, after the hub shell 4 is installed in the base 5, the base 5 is sealed, preventing foreign objects from entering the ratchet mechanism and causing problems.

[0038] In this embodiment, refer to Figure 4 The first transmission ratchet 7 has a first external gear ring on its outer circumferential surface and a first internal gear ring on the inner wall of the drum shell 4. The first internal gear ring meshes with the first external gear ring, thereby limiting the circumferential rotation of the first transmission ratchet 7 and causing it to rotate relative to the second transmission ratchet 8.

[0039] Specifically, refer to Figure 10 The first external gear ring includes a first external tooth 701, a second external tooth 702 and a third external tooth 703. The second external tooth 702 and the third external tooth 703 are arranged adjacent to each other and form a first tooth groove 705 between them. There are six first external teeth 701. A first dummy groove 704 is formed between two adjacent first external teeth 701 and between the first and last two first external teeth 701 and the second external tooth 702 and the third external tooth 703, respectively.

[0040] Reference Figure 6 and Figure 7 The first internal gear ring includes a second tooth groove 403 and seven second dummy grooves 402. A first internal tooth 404 is formed between adjacent second dummy grooves 402. A second internal tooth 405 and a third internal tooth 406 are formed between the second tooth groove 403 and two adjacent second dummy grooves 402, respectively.

[0041] It can be understood that, according to the above structure, the first external gear ring and the first internal gear ring have two meshing states (a first core state and a second meshing state). (Refer to...) Figure 5 a. When the first external gear ring and the first internal gear ring are in the first meshing state, one of the first external teeth 701 engages with the second tooth groove 403, and at the same time, one of the first internal teeth 404 engages with the first tooth groove 705. In this meshing state, the first transmission ratchet 7 and the hub shell 4 cannot rotate circumferentially, which is suitable for most riding scenarios.

[0042] Reference Figure 5 b. When the first external gear ring and the first internal gear ring are in the second meshing state, the first external tooth 701, the second external tooth 702, and the third external tooth 703 are all connected to the second vacant slot 402, while the first internal tooth 404, the second internal tooth 405, and the third internal tooth 406 are all connected to the first vacant slot 704. The first external gear ring and the first internal gear ring can rotate relative to each other at an angle of 10-25°, preferably 17°. That is, in this meshing state, the first transmission ratchet 7 and the hub shell 4 can rotate, which is suitable for specific riding scenarios, such as driving a bicycle without pedaling on a long downhill. At this time, the first external gear ring and the first internal gear ring rotate relative to each other, which can prevent the hub rotation force from being transmitted to the pedal and prevent the risk of 'kickback'.

[0043] In this embodiment, refer to Figure 10 The second transmission ratchet 8 has a second internal gear ring 802 on its inner circumferential surface, as shown in the reference. Figure 11 The outer circumferential surface of the freehub base 5 is provided with a second external gear ring 501, and the second internal gear ring 802 meshes with the second external gear ring 501. That is, the freehub base 5 can drive the second transmission ratchet 8 to rotate, and then drive the first transmission ratchet 7 and the hub shell 4 to rotate, thereby realizing the propulsion of the bicycle.

[0044] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A hub structure, comprising a hub shaft and a hub shell, a freehub, and a ratchet mechanism disposed on the hub shaft, wherein the ratchet mechanism is disposed between the freehub and the hub shell, the ratchet mechanism comprising a first drive ratchet and a second drive ratchet, the end face of the first drive ratchet being provided with a first tooth surface, the end face of the second drive ratchet being provided with a second tooth surface meshing with the first tooth surface, the freehub being connected to the inner circumferential surface of the second drive ratchet, and the hub shell being connected to the outer circumferential surface of the first drive ratchet, characterized in that: An elastic element is connected between the end face of the second transmission ratchet away from the first transmission ratchet and a stepped surface provided inside the hub shell. An annular mounting groove is provided on the inner wall of the hub shell near the base. An annular limiting spring is connected in the annular mounting groove, and the end face of the first transmission ratchet away from the second transmission ratchet abuts against the annular limiting spring.

2. The flower drum structure according to claim 1, characterized in that: The elastic element is a spring, and the two ends of the spring abut against the second transmission ratchet and the stepped surface, respectively.

3. The flower drum structure according to claim 2, characterized in that: The end face of the second transmission ratchet is provided with an annular receiving groove, and the stepped surface is provided with an annular groove corresponding to the annular receiving groove. One end of the spring is received in the annular receiving groove, and the other end of the spring is received in the annular groove.

4. The flower drum structure according to claim 1, characterized in that: The annular limiting spring is provided with a notch, and the annular limiting spring can elastically deform inward based on the notch.

5. A flower drum structure according to claim 1, characterized in that: The annular limiting spring is provided with a shock-absorbing rubber layer on the end face near the first transmission ratchet.

6. A flower drum structure according to claim 1, characterized in that: The end face of the annular limiting spring away from the first transmission ratchet abuts against the limiting ring provided on the tower base. The annular limiting spring is provided with a sealing groove, and the sealing groove is provided with a sealing ring.

7. A flower drum structure according to claim 1, characterized in that: The outer peripheral surface of the first transmission ratchet is provided with a first external gear ring, and the inner wall of the hub shell is provided with a first internal gear ring, which meshes with the first external gear ring.

8. A flower drum structure according to claim 7, characterized in that: The first external gear ring includes a first external tooth, a second external tooth, and a third external tooth. The second external tooth and the third external tooth are arranged adjacent to each other and form a first tooth groove between them. There are multiple first external teeth. A first vacant groove is formed between two adjacent first external teeth and between the first and last two first external teeth and the second external tooth and the third external tooth, respectively. The first internal gear ring includes a second tooth groove and multiple second vacant grooves. A first internal tooth is formed between the multiple second vacant grooves. A second internal tooth and a third internal tooth are formed between the second tooth groove and two adjacent second vacant grooves, respectively. The first external gear ring and the first internal gear ring have two meshing states. When they are in one of the meshing states, one of the first external teeth engages with the second tooth groove, and at the same time, one of the first internal teeth engages with the first tooth groove. When in another meshing state, the first external tooth, the second external tooth, and the third external tooth are all connected to the second dummy slot, while the first internal tooth, the second internal tooth, and the third internal tooth are all connected to the first dummy slot, and the first external tooth ring and the first internal tooth ring can rotate relative to each other by an angle.

9. A flower drum structure according to claim 8, characterized in that: The angle is 10-25°.

10. A flower drum structure according to claim 1, characterized in that: The second transmission ratchet has a second internal gear ring on its inner circumferential surface and a second external gear ring on its outer circumferential surface. The second internal gear ring meshes with the second external gear ring.

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