High-stability hub structure of bicycle

Abstract

The utility model relates to a high-stability hub structure of a bicycle, which comprises a hub shell, a mandrel arranged in the hub shell, a flywheel shaft positioned between the mandrel and the hub shell, and a ratchet mechanism arranged between the end of the hub shell and the shaft end of the flywheel shaft, the ratchet wheel mechanism comprises a ratchet wheel fixed to the hub shell end, pawls circumferentially arranged at the flywheel shaft end and independent curved reeds in one-to-one correspondence with the pawls, the outer side face of each pawl is provided with three ratchets meshed with inner teeth of the ratchet wheel, and the ends, facing the pawls, of the reeds are provided with inwards-inclined folded edges. And the bent part at the folded edge of the reed is propped against the inner side surface of the pawl. The pawls and the independent curved reeds are in one-to-one correspondence, one reed only acts on one pawl, mutual influence is not generated, the stability of the pawls is improved, one end of each reed is provided with an inwards-inclined folded edge, contact between the reeds and the pawls is achieved through bent parts at the folded edges, moving resistance can be reduced, and rotation flexibility of the pawls is improved.

Description

Technical Field

[0001] The utility model belongs to the field of bicycle transmission, in particular to a high-stability hub structure of a bicycle. Background Art

[0002] The bicycle hub is a key component of a bicycle. The spokes support the rim, maintaining the wheel's shape and allowing it to roll stably on the ground. The internal rotating structure of the hub allows the axle and housing to rotate relatively freely, allowing the wheel to rotate smoothly around the axle. The hub consists of the hub shell, the axle core structure at the center of the hub, the rotating structure between the central axle and the hub shell, and the ratchet structure.

[0003] There are many types of ratchet structures in the hub. The most common one is the spring pawl ratchet structure, which consists of a ratchet, a pawl and a spring. The ratchet is usually installed on the hub shaft or on a component connected to the shaft, and the pawl engages with the ratchet tooth groove through the force of the spring.

[0004] However, the commonly used pawl system currently uses a ring-shaped steel wire spring as an elastic element to control the pawl. However, if the spring tension drops, the meshing force between the pawl and the ratchet wheel will weaken. During normal riding, the pawl may not fit snugly within the ratchet tooth. This results in energy loss during power transmission, resulting in insufficient power during wheel rotation and requiring the rider to expend more effort to drive the wheel forward. Due to the insufficient spring tension, the pawl cannot be stably retained in the ratchet tooth. Under rapid wheel rotation or high impact, the pawl may become disengaged. Once the pawl is disengaged, the hub will briefly spin, and the wheel will lose power. When the pawl reengages the ratchet tooth, it may jump, causing the hub to rotate unsteadily. This can cause noticeable wheel jerking during riding, impacting the riding experience. It can also cause additional wear on other internal hub components, shortening the lifespan of the hub. Summary of the Invention

[0005] The utility model provides a high-stability bicycle hub structure, which adopts an independent curved spring as a pawl supporting elastic member. One spring acts on only one pawl, and the springs do not affect each other, thereby improving the stability of the pawl. The end of the spring that contacts the pawl is provided with an inward-inclined folded edge, which reduces the friction between the pawl and the spring and improves the flexibility of the pawl.

[0006] The specific technical solution of the utility model is: a high-stability bicycle hub structure, including a hub shell, a core shaft arranged in the hub shell, a flywheel shaft between the core shaft and the hub shell, a ratchet mechanism is arranged between the end of the hub shell and the shaft end of the flywheel shaft, the ratchet mechanism includes a ratchet fixed to the end of the hub shell, a pawl circumferentially arranged at the end of the flywheel shaft and an independent curved spring corresponding to the pawl one by one, the outer side of the pawl is provided with three ratchet teeth meshing with the inner teeth of the ratchet, and an inward-inclined folded edge is provided on the end of the reed facing the pawl, and the bent portion of the folded edge of the reed conflicts with the inner side of the pawl.

[0007] The pawl corresponds to the independent curved spring leaf one by one, and one spring leaf only acts on one pawl, and they do not affect each other, thereby improving the stability of the pawl; three ratchet teeth are provided on the pawl to engage with the inner teeth of the ratchet wheel, and the position of the ratchet teeth is on the outer side of the pawl, so that after cooperating with the ratchet wheel, there are multiple force contact points, which can also improve the stability of the pawl; an inward-inclined folding edge is provided at one end of the spring leaf, and the contact between the spring leaf and the pawl is achieved through the bend at the folding edge. The bend of the folding edge is basically an arc shape, so that it contacts the surface of the pawl, which can reduce the movement resistance and avoid the end of the spring leaf pressing against the pawl. At the same time, it can also avoid affecting the pawl and improve the rotation flexibility of the pawl.

[0008] Preferably, there are 6 pairs of pawls and reeds, and 6 mounting slots are provided at the shaft end of the flywheel shaft, each mounting slot includes a pawl slot and a reed slot, and the pawl slot and the reed slot are both circular with openings, the radius of the circle where the center of the pawl slot is located is larger than the radius of the circle where the center of the reed slot is located, and the opening of the pawl slot is opposite to the opening of the reed slot.

[0009] Preferably, the opening of the mounting slot is formed of parallel straight edges on both sides, the central angle of the pawl slot is 250°, the central angle of the spring slot is 252°, and the bottom of the mounting slot is located between the pawl slot and the spring slot. The bottom of the slot is inclined relative to the line connecting the centers of the pawl slot and the spring slot at an angle of 7°, with the end facing the pawl slot being higher than the end facing the spring slot. This structure can effectively adjust the angle of force transmission between the spring and the pawl.

[0010] Preferably, the six mounting slots are divided into two groups, each group including three mounting slots evenly spaced at 120° intervals, the interval angles between adjacent mounting slots are 57° and 63° respectively, the interval angle between the mounting slots on the reed slot side is 57°, and the interval angle between the mounting slots on the pawl slot side is 63°.

[0011] Preferably, a relief groove is provided on the axial end face of the flywheel shaft corresponding to the mounting groove. The relief groove has a depth of 0.1 mm and comprises a relief groove bottom that coincides with the groove bottom of the mounting groove, a first arcuate segment that coincides with the arc of the pawl groove, and a second arcuate segment that coincides with the arc of the reed groove. The first arcuate segment, the relief groove bottom, and the second arcuate segment are connected and transitioned by an arc. The end face of the relief groove relative to the flywheel shaft is concave, thereby reducing the contact area between the pawl and the end face of the flywheel shaft, thereby reducing friction and facilitating movement of the pawl. Similarly, the contact area between the reed and the end face of the flywheel shaft is also reduced, thereby reducing friction and facilitating movement of the reed.

[0012] Preferably, the portion where the flywheel shaft cooperates with the hub shell has the largest diameter portion of the flywheel shaft, a sealing groove is provided on the outer periphery of the largest diameter portion, a sealing ring is provided in the sealing groove, the sealing ring includes a main ring that cooperates with the sealing groove and an inclined sealing petal radially outward from the main ring, the inclined sealing petal contacts the inner wall of the end portion of the shaft hole of the hub shell.

[0013] Preferably, one axial end of the mounting groove extends beyond the end of the flywheel shaft, and a flange is provided at the end of the flywheel shaft. The flange has an outer diameter greater than the diameter of the portion of the pawl closest to the axis of the flywheel shaft, and a relief notch is provided on the flange at positions corresponding to the pawl and the spring. The relief notch facilitates installation of the pawl and the spring.

[0014] Preferably, the axial length of the mounting groove is greater than the thickness of the pawl, which in turn is greater than the thickness of the spring. A gap is formed between the inner surface of the retaining edge and the side edges of the pawl and the spring, and a plastic retaining ring is disposed within the gap. The provision of the retaining edge and the plastic retaining ring limits the position of the pawl and the spring, ensuring a stable position of the pawl and the spring and improving safety.

[0015] Preferably, the reed includes an arc-shaped bent portion and two reed feet, one of which is a short reed foot in contact with the flywheel shaft, and the other reed foot is a long reed foot in contact with the pawl, and the folded edge is arranged at the end of the long reed foot, the length of the long reed foot is greater than the length of the short reed foot, and the folded edge is inclined inward toward the side of the short reed foot.

[0016] Preferably, the central angle of the arc-shaped curved portion is 304°, and the inward inclination angle of the folded edge relative to the long spring leg is 60°.

[0017] The beneficial effects of the present invention are as follows: the pawl corresponds to the independent curved spring leaf one-to-one, one spring leaf only acts on one pawl, and they do not affect each other, thereby improving the stability of the pawl; three ratchet teeth are provided on the pawl to mesh with the inner teeth of the ratchet wheel, and the position of the ratchet teeth is on the outer side of the pawl, so that after cooperating with the ratchet wheel, there are multiple force contact points, which can also improve the stability of the pawl; an inward-inclined folding edge is provided at one end of the spring leaf, and the contact between the spring leaf and the pawl is achieved through the bend at the folding edge, and the bending of the folding edge is basically arc-shaped, so that it contacts the surface of the pawl, which can reduce the movement resistance and avoid the end of the spring leaf pressing against the pawl, while also avoiding affecting the pawl, thereby improving the rotation flexibility of the pawl. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of a ratchet mechanism of the utility model;

[0020] Figure 3 This is a structural schematic diagram of a flywheel shaft of the utility model;

[0021] Figure 4 This is a schematic end view of a flywheel shaft of the utility model;

[0022] Figure 5 This is a structural diagram of a reed of the utility model;

[0023] In the figure: 1. hub shell, 2. core shaft, 3. flywheel shaft, 4. ratchet, 5. pawl, 6. sealing ring, 7. bearing, 8. plastic retaining ring, 9. reed, 10. sealing groove, 11. mounting groove, 12. retaining edge, 13. pawl groove, 14. avoidance groove, 15. reed groove, 16. arc-shaped bend, 17. short reed leg, 18. long reed leg, 19. folded edge. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to specific embodiments and in conjunction with the accompanying drawings. Example

[0025] like Figure 1 Figure 2 As shown, a high-stability bicycle hub structure includes a hub shell 1, a spindle 2 disposed within the hub shell, and a flywheel shaft 3 located between the spindle and the hub shell. The hub shell, spindle, and flywheel shaft are coaxial. The spindle and the hub shell are supported by two bearings, and the flywheel shaft and the spindle are supported by a bearing 7. A ratchet mechanism is provided between the end of the hub shell and the end of the flywheel shaft.

[0026] like Figure 3As shown, the part where the flywheel shaft cooperates with the hub shell has the largest diameter part of the flywheel shaft, and a sealing groove 10 is provided on the outer periphery of the largest diameter part. A sealing ring 6 is provided in the sealing groove. The sealing ring includes a main ring that cooperates with the sealing groove and an inclined sealing petal radially outward from the main ring. The inclined sealing petal contacts the inner wall of the end of the shaft hole of the hub shell. After the sealing ring is installed, the sealing petal is inclined toward the outside of the end of the hub shell.

[0027] The ratchet mechanism includes a ratchet 4 fixed to the end of the hub shell, a pawl 5 circumferentially arranged at the end of the flywheel shaft and an independent curved reed 9 corresponding to the pawl. There are 6 pairs of pawls and reeds in total. The outer side of the pawl is provided with three ratchet teeth that engage with the inner teeth of the ratchet. The end of the reed facing the pawl is provided with an inward-inclined folded edge 19, and the bent portion of the reed folded edge conflicts with the inner side of the pawl.

[0028] The flywheel shaft has six mounting slots 11 at its end, each including a pawl slot 13 and a reed slot 15. Both the pawl slot and the reed slot are circular with openings. The radius of the circle containing the pawl slot's center is greater than the radius of the circle containing the reed slot's center, and the pawl slot opening and the reed slot opening are opposite each other. The mounting slot openings are flanked by parallel straight edges. The pawl slot has a central angle of 250°, while the reed slot has a central angle of 252°. The mounting slot bottom is located between the pawl slot and the reed slot. The bottom is inclined at a 7° angle relative to the line connecting the pawl slot's and reed slot's centers, with the end facing the pawl slot being higher than the end facing the reed slot. The 6 mounting slots are divided into two groups, each group includes 3 mounting slots evenly spaced at 120° intervals. The interval angles between adjacent mounting slots are 57° and 63° respectively. The interval angle between the mounting slots on the reed slot side is 57°, and the interval angle between the mounting slots on the pawl slot side is 63°.

[0029] like Figure 4 As shown, a relief groove 14 is provided on the axial end face of the flywheel shaft corresponding to the mounting groove. The depth of the relief groove is 0.1 mm. The relief groove has a relief groove bottom that coincides with the groove bottom of the mounting groove, a first arc segment that matches the circular arc of the pawl groove, and a second arc segment that matches the circular arc of the spring groove. The first arc segment, the relief groove bottom, and the second arc segment are connected and transitioned by an arc. One axial end of the mounting groove extends beyond the axial end of the flywheel shaft. A circle of retaining flanges 12 is provided at the end position of the flywheel shaft. The outer diameter of the retaining flange is larger than the diameter of the portion of the pawl closest to the axis of the flywheel shaft. Relief recesses are provided on the retaining flange corresponding to the positions of the pawl and the spring. The relief recesses facilitate the installation of the pawl and the spring. The axial length of the mounting groove is greater than the thickness of the pawl, and the axial length of the mounting groove is greater than the thickness of the spring. A gap is formed between the inner surface of the retaining flange and the side edges of the pawl and the spring. A plastic retaining ring 8 is provided in the gap.

[0030] like Figure 5As shown, the spring includes an arcuate bend 16 and two spring legs. One leg is a short leg 17 that contacts the flywheel shaft, and the other leg is a long leg 18 that contacts the pawl. The folded edge is provided at the end of the long leg. The long leg is longer than the short leg, and the folded edge is tilted inward toward the short leg. The central angle of the arcuate bend is 304°, and the inward angle of the folded edge relative to the long leg is 60°.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation of the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high-stability bicycle hub structure, characterized in that: The invention comprises a hub shell (1), a core shaft (2) arranged in the hub shell, and a flywheel shaft (3) between the core shaft and the hub shell. A ratchet mechanism is arranged between the hub shell end and the shaft end of the flywheel shaft. The ratchet mechanism comprises a ratchet (4) fixed to the hub shell end, a pawl (5) circumferentially arranged at the flywheel shaft end, and an independent curved spring (9) corresponding to the pawl. The outer side surface of the pawl is provided with three ratchet teeth meshing with the inner teeth of the ratchet. The end of the spring facing the pawl is provided with an inwardly inclined folded edge (19), and the bent portion of the folded edge of the spring contacts the inner side surface of the pawl.

2. A high-stability bicycle hub structure according to claim 1, characterized in that: There are 6 pairs of pawls and reeds, and the shaft end of the flywheel shaft is provided with 6 mounting grooves (11), each mounting groove includes a pawl groove (13) and a reed groove (15), and the pawl groove and the reed groove are both circular with openings, the radius of the circle where the center of the pawl groove is located is greater than the radius of the circle where the center of the reed groove is located, and the opening of the pawl groove is opposite to the opening of the reed groove.

3. The high-stability bicycle hub structure according to claim 2, characterized in that: The two sides of the opening of the mounting groove are parallel straight edges, the central angle of the pawl groove is 250°, the central angle of the reed groove is 252°, and the bottom of the mounting groove is between the pawl groove and the reed groove. The bottom of the groove is inclined relative to the line between the center of the pawl groove and the center of the reed groove, with an inclination angle of 7°, and the end facing the pawl groove is higher than the end facing the reed groove.

4. The high-stability bicycle hub structure according to claim 2, characterized in that: The 6 mounting slots are divided into two groups, each group includes 3 mounting slots evenly spaced at 120° intervals. The interval angles between adjacent mounting slots are 57° and 63° respectively. The interval angle between the mounting slots on the reed slot side is 57°, and the interval angle between the mounting slots on the pawl slot side is 63°.

5. A high-stability bicycle hub structure according to claim 2, 3 or 4, characterized in that: An avoidance groove (14) is provided on the axial end surface of the flywheel shaft corresponding to the mounting groove, the depth of the avoidance groove is 0.1 mm, the avoidance groove has an avoidance groove bottom that coincides with the groove bottom of the mounting groove, a first arc segment that coincides with the circular arc of the pawl groove, and a second arc segment that coincides with the circular arc of the reed groove, and the first arc segment, the avoidance groove bottom, and the second arc segment are connected and transitioned by an arc.

6. A high-stability bicycle hub structure according to claim 1, 2, 3 or 4, characterized in that: The portion where the flywheel shaft and the hub shell cooperate with each other has a maximum diameter portion of the flywheel shaft, a sealing groove (10) is provided on the outer periphery of the maximum diameter portion, a sealing ring (6) is provided in the sealing groove, the sealing ring comprising a main ring that cooperates with the sealing groove and a sealing flap that is inclined radially outward from the main ring, the inclined sealing flap being in contact with the inner wall of the end portion of the shaft hole of the hub shell.

7. The high-stability bicycle hub structure according to claim 6, characterized in that: One axial end of the mounting groove extends beyond the end of the flywheel shaft, and a rib (12) is provided at the end of the flywheel shaft. The outer diameter of the rib is larger than the diameter of the closest portion of the pawl relative to the axis of the flywheel shaft, and an avoidance recess is provided on the rib corresponding to the position of the pawl and the spring.

8. The high-stability bicycle hub structure according to claim 7, characterized in that: The axial length of the mounting groove is greater than the thickness of the pawl, and the axial length of the mounting groove is greater than the thickness of the spring. A gap is formed between the inner surface of the retaining edge and the side edges of the pawl and the spring, and a plastic retaining ring (8) is provided in the gap.

9. A high-stability bicycle hub structure according to claim 1, 2, 3 or 4, characterized in that: The reed comprises an arc-shaped bent portion (16) and two reed legs, wherein one reed leg is a short reed leg (17) in contact with the flywheel shaft, and the other reed leg is a long reed leg (18) in contact with the pawl, wherein the folded edge is provided at the end of the long reed leg, the length of the long reed leg is greater than the length of the short reed leg, and the folded edge is inclined inwardly toward the side of the short reed leg.

10. The high-stability bicycle hub structure according to claim 9, characterized in that: The central angle of the arc-shaped bending portion is 304°, and the inward inclination angle of the folded edge relative to the long spring leg is 60°.

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