阅读说明：本技术 自行车花鼓结构 (Bicycle hub structure ) 是由 杰森·梅尔斯 于 2019-10-09 设计创作，主要内容包括：本发明提供一种自行车花鼓结构,包括：一花鼓本体,设有一第一离合环,一棘轮座,设有一第二离合环及一磁力环,该磁力环设于该第二离合环远离该花鼓本体的一轴向侧面,该第二离合环与该磁力环相邻的一侧设置有多个第一磁体；该棘轮座具有第一状态及第二状态,于第一状态时,该第一磁体与该磁力环可吸引该第一离合环,使该第一离合环与该第二离合环接合,于第二状态时,该第一磁体与该磁力环对该第一离合环的磁吸力小于第一状态。因此当第一离合环的第一棘齿受第二离合环的第二棘齿推抵而远离时,不会因磁力吸引而回复接合,可减少第一、第二离合环间的接触及摩擦产生的噪音及磨损。(The invention provides a bicycle hub structure, comprising: the hub body is provided with a first clutch ring, the ratchet seat is provided with a second clutch ring and a magnetic ring, the magnetic ring is arranged on one axial side surface of the second clutch ring, which is far away from the hub body, and one side of the second clutch ring, which is adjacent to the magnetic ring, is provided with a plurality of first magnets; the ratchet seat has a first state and a second state, wherein in the first state, the first magnet and the magnetic force ring can attract the first clutch ring to enable the first clutch ring to be jointed with the second clutch ring, and in the second state, the magnetic attraction force of the first magnet and the magnetic force ring to the first clutch ring is smaller than that in the first state. Therefore, when the first ratchet of the first clutch ring is pushed and pushed away by the second ratchet of the second clutch ring, the magnetic attraction can not be used for restoring the joint, and the noise and the abrasion caused by the contact and the friction between the first clutch ring and the second clutch ring can be reduced.)

1. A bicycle hub structure, comprising:

the hub body is provided with a first clutch ring;

the ratchet wheel seat is assembled at one side of the hub body and is provided with a second clutch ring, a plurality of first magnets and a magnetic ring, the magnetic ring is arranged at one axial side surface of the second clutch ring, which is far away from the hub body, and the plurality of first magnets are arranged at one side of the second clutch ring, which is adjacent to the magnetic ring;

the mandrel penetrates through the hub body and the ratchet wheel seat and is connected with the hub body and the ratchet wheel seat through a plurality of bearings;

a first torque transmission mechanism is arranged between the second clutch ring and the ratchet wheel seat, and a second torque transmission mechanism is arranged between the first clutch ring and the second clutch ring;

a third torque transmission mechanism is arranged between the first clutch ring and the hub body; the ratchet seat has a first state and a second state, wherein in the first state, the first magnet and the magnetic ring can attract the first clutch ring to enable the first clutch ring and the second clutch ring to be jointed, torque can be transmitted to the hub body from the ratchet seat through the second clutch ring and the first clutch ring, and in the second state, the magnetic attraction of the first magnet and the magnetic ring to the first clutch ring is smaller than that in the first state.

2. The bicycle hub assembly of claim 1, wherein the first plurality of magnets are equidistantly spaced around the second clutch ring adjacent to the magnetic ring, the magnetic ring is equidistantly spaced around the second plurality of magnets, and the first plurality of magnets and the second plurality of magnets are oppositely disposed.

3. The bicycle hub assembly of claim 2, wherein the adjacent ends of two adjacent first magnets have different polarities, and the adjacent ends of two adjacent second magnets have different polarities.

4. The bicycle hub assembly of claim 3, wherein in the first state, the first and second magnets are magnetically repulsive, and the first and second magnets attract the first and second clutch rings together to form the second torque-transmitting mechanism.

5. The bicycle hub structure of claim 3, wherein the plurality of first magnets and the plurality of second magnets are magnetically attractive when in the second state, and the plurality of first magnets and the plurality of second magnets do not attract the first clutch ring.

6. The bicycle hub structure according to claim 1, wherein the inner periphery of the ratchet seat is provided with at least one first protrusion and at least one receiving groove, the magnetic ring is provided with at least one second protrusion, and the second protrusion of the magnetic ring is disposed in the at least one receiving groove of the ratchet seat.

7. The bicycle hub assembly of claim 6, wherein when the ratchet seat is rotated counterclockwise as viewed from the ratchet seat toward the hub body, the first protrusion of the ratchet seat pushes against the second protrusion of the magnetic ring for a radial displacement to transition the ratchet seat from the first state to the second state.

8. The bicycle hub assembly of claim 7, wherein the ratchet seat rotates in a direction opposite to the rotational direction of the hub body.

9. The bicycle hub assembly of claim 6, wherein when the ratchet seat is rotated clockwise as viewed from the ratchet seat toward the hub body, the first protrusion of the ratchet seat pushes against the second protrusion of the magnetic ring for a radial displacement, such that the ratchet seat is transformed from the second state to the first state.

10. The bicycle hub assembly of claim 9, wherein the ratchet seat rotates in the same direction as the hub body.

11. The bicycle hub assembly of claim 1, wherein the hub body is provided with an assembly ring that is assembled with its outer periphery to the inner periphery of the hub body.

12. The bicycle hub structure of claim 11, wherein the companion ring has a first axial length and the first clutch ring has a second axial length, the first axial length of the companion ring being greater than the second axial length of the first clutch ring.

13. The bicycle hub structure according to claim 11, wherein the inner periphery of the ratchet wheel seat is provided with an inner toothed ring, the second clutch ring is provided with a plurality of splines engaged with the inner toothed ring to form the first torque transmission mechanism, the first clutch ring is provided with a plurality of first ratchet teeth toward an axial side of the ratchet wheel seat, the second clutch ring is provided with a plurality of second ratchet teeth toward an axial side of the hub body, the plurality of first ratchet teeth and the plurality of second ratchet teeth are engaged to form the second torque transmission mechanism, the outer periphery of the first clutch ring is provided with a plurality of outer ratchet teeth, the inner periphery of the assembly ring is provided with a plurality of inner ratchet teeth, and the plurality of outer ratchet teeth and the plurality of inner ratchet teeth are engaged to form the third torque transmission mechanism.

14. The bicycle hub structure according to claim 13, wherein the second clutch ring includes a first ring body adjacent to the first clutch ring and a second ring body adjacent to the magnetic ring, the first ring body having an axial side facing the hub body, the second ring body having another axial side opposite to the axial side, the radially outer peripheral rings of the first and second ring bodies being provided with the plurality of splines.

15. The bicycle hub assembly of claim 14, wherein the first magnet is disposed on the second ring.

16. The bicycle hub structure as in claim 1, wherein a sleeve is disposed around the spindle, the first clutch ring, the second clutch ring and the magnetic ring are disposed around the sleeve, and a friction member is disposed between the magnetic ring and the sleeve.

Technical Field

The invention relates to a hub of a bicycle, in particular to a clutch type hub structure of the bicycle.

Background

Now, a known US patent US2009/0255774a1 is a ratchet device for a bicycle rear frame, please refer to fig. 1 and fig. 2 together, which has an axle and a hub 1 mounted on the axle, the ratchet device 2 has a flywheel 3 mounted around the axle and having a collar 4, a ratchet ring 5 and a permanent magnet 6, wherein a center hole of the flywheel 3 is sleeved on the axle, the flywheel 3 has an inner surface facing the hub 1 and a plurality of wedge-shaped teeth a annularly arranged on the inner surface of the flywheel 3, the plurality of wedge-shaped teeth a protrude from the inner surface; the collar 4 is magnetic, the outer circumference of the collar is provided with an external thread 7 which can be firmly screwed on a thread part of the hub 1, and the inner circumference of the collar 4 is annularly provided with concave-convex adjacent connected meshing teeth 8; the ratchet ring 5 can be magnetic and is arranged on the wheel shaft, and is provided with an inner side, an outer side and an outer surface, the periphery of the ratchet ring 5 is annularly provided with a continuous concave-convex joint groove 9, the joint groove 9 is matched with the joint teeth 8 of the shaft collar 4, the outer side of the ratchet ring 5 facing the direction of the flywheel 3 is annularly provided with a plurality of ratchets b, and the ratchets b protrude out of the outer side of the ratchet ring 5 and are meshed with the wedge-shaped teeth a of the flywheel 3 so as to be driven by the flywheel 3 to rotate. The permanent magnet 6 is annularly sleeved on the wheel shaft and is arranged in the shaft ring 4, and the permanent magnet 6 is arranged on the inner side edge of the ratchet ring 5 so as to control the ratchet teeth b of the ratchet ring 5 to be engaged with the wedge-shaped teeth a of the flywheel 3.

Therefore, when the pedals of the bicycle are reversely stepped on, the chain of the bicycle drives the flywheel 3 to rotate in the anticlockwise direction, the wedge-shaped teeth a of the flywheel 3 push away the ratchet teeth b of the ratchet ring 5, the ratchet ring 5 moves inwards along the wheel axle direction, and the permanent magnet 6 is pushed to move inwards out of the axle ring 4 along with the inwards movement of the ratchet ring 5.

When the pedaling of the bicycle is stopped, i.e. the flywheel 3 stops rotating, the collar 4 and the ratchet ring 5 provide magnetic attraction to the permanent magnet 6, the permanent magnet 6 is attracted into the collar 4, the permanent magnet 6 pushes and resets the ratchet ring 5, and the ratchet teeth b of the ratchet ring 5 are engaged with the wedge-shaped teeth a of the flywheel 3.

When the pedal of the bicycle is being stepped on to drive the bicycle forward, the wedge-shaped teeth a of the flywheel 3 are engaged with the ratchet teeth b of the ratchet ring 5 to drive the ratchet ring 5 to rotate, the engaging grooves 9 of the ratchet ring 5 are engaged with the engaging teeth 8 of the shaft collar 4, and the shaft collar 4 is screwed with the hub 1, so that the shaft collar 4 can drive the hub 1 of the bicycle to rotate, and further drive the wheels of the bicycle to rotate forward.

When the bicycle pedal is stepped on reversely, although the permanent magnet 6 is pushed out of the collar 4 by the ratchet ring 5 and is displaced toward the inner side of the wheel shaft, the magnetic attraction between the collar 4 and the ratchet ring 5 attracts the permanent magnet 6, so that the ratchet teeth b of the ratchet ring 5 contact the wedge-shaped teeth a of the flywheel, thereby generating friction and generating noise and causing abrasion between elements.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned drawbacks of the prior art that the ratchet device of the rear frame of a bicycle generates noise and wear when the pedal of the bicycle is reversely stepped, and further provides a structure of a hub of a bicycle.

To achieve the above object, the present invention provides a bicycle hub structure, comprising: a hub body is provided with a first clutch ring; the ratchet wheel seat assembly is arranged on one side of the hub body and is provided with a second clutch ring, a plurality of first magnets and a magnetic ring, the magnetic ring is arranged on one axial side surface of the second clutch ring, which is far away from the hub body, and the plurality of first magnets are arranged on one side of the second clutch ring, which is adjacent to the magnetic ring; a mandrel penetrates through the hub body and the ratchet wheel seat and is connected with the hub body and the ratchet wheel seat through a plurality of bearings; a first torque transmission mechanism is arranged between the second clutch ring and the ratchet wheel seat, and a second torque transmission mechanism is arranged between the first clutch ring and the second clutch ring; a third torque transmission mechanism is arranged between the first clutch ring and the hub body; the ratchet seat has a first state and a second state, wherein in the first state, the first magnet and the magnetic force ring can attract the first clutch ring to enable the first clutch ring to be jointed with the second clutch ring, torque can be transmitted to the hub body from the ratchet seat through the second clutch ring and the first clutch ring, and in the second state, the magnetic attraction force of the first magnet and the magnetic force ring to the optional first clutch ring is smaller than that in the first state.

Optionally, the plurality of first magnets are equidistantly arranged on one side of the second separation ring adjacent to the magnetic ring, the plurality of second magnets are equidistantly arranged on the magnetic ring, and the plurality of first magnets and the plurality of second magnets are oppositely arranged.

Optionally, the polarities of the two adjacent ends of two adjacent first magnetic bodies are different, and the polarities of the two adjacent ends of two adjacent second magnetic bodies are different.

Optionally, in a first state, the first magnets and the second magnets repel each other in magnetic property, and the first clutch ring and the second clutch ring are attracted together by the first magnets and the second magnets to form the second torque transmission mechanism.

Optionally, in the second state, the magnetism of the plurality of first magnets and the plurality of second magnets are attracted, and the plurality of first magnets and the plurality of second magnets do not attract the first clutch ring.

Optionally, the inner circumference of the ratchet seat is provided with at least one first protrusion and at least one accommodating groove, the magnetic ring is provided with at least one second protrusion, and the second protrusion of the magnetic ring is disposed in the at least one accommodating groove of the ratchet seat.

Optionally, when the ratchet seat is rotated counterclockwise as viewed from the ratchet seat toward the hub body, the first protruding portion of the ratchet seat pushes against the second protruding portion of the magnetic ring to rotate for a radial displacement, so that the ratchet seat is changed from the first state to the second state.

Optionally, the ratchet seat rotates in a direction opposite to the rotation direction of the hub body.

Optionally, when the ratchet seat is rotated clockwise as viewed from the ratchet seat toward the hub body, the first protruding portion of the ratchet seat pushes against the second protruding portion of the magnetic ring to rotate for a radial displacement, so that the ratchet seat is changed from the second state to the first state.

Optionally, the ratchet seat rotates in the same direction as the rotation direction of the hub body.

Optionally, the hub body is provided with an assembly ring which is assembled with its outer periphery to the inner periphery of the hub body.

Optionally, the mating ring has a first axial length, the first clutch ring has a second axial length, and the first axial length of the mating ring is greater than the second axial length of the first clutch ring.

Optionally, an inner gear ring is disposed on an inner periphery of the ratchet seat, the second clutch ring is disposed with a plurality of splines, the plurality of splines are engaged with the inner gear ring to form the first torque transmission mechanism, the first clutch ring is disposed with a plurality of first ratchet teeth toward an axial side of the ratchet seat, the second clutch ring is disposed with a plurality of second ratchet teeth toward an axial side of the hub body, the plurality of first ratchet teeth are engaged with the plurality of second ratchet teeth to form the second torque transmission mechanism, the first clutch ring is disposed with a plurality of outer ratchet teeth on an outer periphery thereof, the mating ring is disposed with a plurality of inner ratchet teeth on an inner periphery thereof, and the plurality of outer ratchet teeth are engaged with the plurality of inner ratchet teeth to form the third torque transmission mechanism.

Optionally, the second clutch ring includes a first ring body adjacent to the first clutch ring and a second ring body adjacent to the magnetic ring, the first ring body has an axial side facing the hub body, the second ring body has another axial side opposite to the axial side, and the radial outer peripheral rings of the first ring body and the second ring body are provided with the plurality of splines.

Optionally, the first magnet is disposed on the second ring body.

Optionally, a sleeve is sleeved on the outer periphery of the mandrel, the first clutch ring, the second clutch ring and the magnetic ring are sleeved on the sleeve, and a friction member is arranged between the magnetic ring and the sleeve.

Therefore, when the pedal of the bicycle is being stepped on, the ratchet wheel seat can be driven to rotate clockwise, and the hub body and the ratchet wheel seat are driven to rotate together. At this time, the first magnet of the second clutch ring and the second magnet of the magnetic ring repel each other magnetically, the N-pole of the first magnet faces the N-pole of the second magnet, and the S-pole of the first magnet faces the S-pole of the second magnet, so that the magnetic force lines passing through the first clutch ring are increased. Therefore, the magnetic force of the first magnet of the second clutch ring and the second magnet of the magnetic ring attracts the first clutch ring, so that the first clutch ring moves axially towards the second clutch ring, and the first ratchet is engaged with the second ratchet of the second clutch ring, so that the ratchet seat drives the hub body to rotate, and further the wheels of the bicycle are driven to move forwards.

When the bicycle stops being trampled, the ratchet seat is not driven by the chain to stop rotating, the hub body continuously rotates due to inertia and drives the bicycle to move forwards, and at the moment, the second ratchet of the second clutch ring is separated from the first ratchet of the first clutch ring due to the tooth-shaped structure of the ratchet.

When the pedal of the bicycle is treaded reversely, the ratchet wheel seat can be driven to rotate in the anticlockwise direction, and the ratchet wheel seat and the hub body can rotate reversely. At the moment, the second protruding part of the magnetic force ring is pushed by the first protruding part of the ratchet seat, so that the second magnet is attracted to the first magnet, the N pole of the first magnet is opposite to the S pole of the second magnet, the S pole of the first magnet is opposite to the N pole of the second magnet, and further, the magnetic force line entering the first clutch ring is reduced, so that the magnetic force attracting the first clutch ring to lean against the second clutch ring is reduced, therefore, when the first ratchet of the first clutch ring is pushed by the second ratchet of the second clutch ring to be away from the first ratchet, the first ratchet of the first clutch ring is not attracted by the magnetic force to be restored to be jointed, the contact between the first ratchet of the first clutch ring and the second ratchet of the second clutch ring is reduced, and the noise and abrasion generated by the friction between the first ratchet of the first clutch ring and the second ratchet of the second clutch ring are reduced.

Drawings

FIG. 1 is an exploded perspective view of a ratchet device for a rear bicycle frame as disclosed in US2009/0255774A 1;

FIG. 2 is a schematic combination of the ratchet device for the rear frame of a bicycle as described in US2009/0255774A 1;

FIG. 3A is an exploded perspective view of the first embodiment of the present invention;

FIG. 3B is an exploded perspective view of a second embodiment of the present invention;

FIG. 4A is an exploded perspective view of the first embodiment of the present invention in another orientation;

FIG. 4B is an exploded perspective view of the second embodiment of the present invention in another orientation;

FIG. 5 is an assembled cross-sectional view of the first embodiment of the present invention;

FIG. 6A is a schematic diagram illustrating a pedaling operation of a bicycle according to a first embodiment of the present invention;

FIG. 6B is a schematic view of the operation of pedaling the bicycle in reverse according to the first embodiment of the present invention;

FIGS. 7A and 7B are schematic diagrams of magnetic poles of the magnetic ring cooperating with the second clutch ring according to the present invention;

FIG. 8A is a schematic view of the magnetic lines of force running inside the magnet;

FIG. 8B is a schematic view of the first magnet and the second magnet repelling each other to attract the first clutch ring and the second clutch ring to engage;

FIG. 8C is a schematic view of the first magnet magnetically attracting the second magnet, with the first clutch ring away from the second clutch ring, in accordance with the present invention;

FIGS. 9A and 9B are schematic views of the magnetic ring assembly of the present invention in a ratchet seat.

The notation in the figure is:

the known technology comprises the following steps: 1: a hub; 2: a ratchet gear; 3: a flywheel; 4: a collar; 5: a ratchet ring; 6: a permanent magnet;

7: an external thread; 8: meshing teeth; 9: an engaging groove; a: wedge-shaped teeth; b: a ratchet;

the invention comprises the following parts: 10: a hub body; 11: an end portion; 12: a threaded portion; 20: a ratchet seat; 21: an end portion; 22: an inner gear ring;

23: a first projecting portion; 24: a containing groove; 24 a: a first end portion; 24 b: a second end portion; 30: a mandrel; 31: a first bearing; 32: a second bearing; 33: a third bearing; 34: a fourth bearing; 35. 36: a sleeve; 37: a bushing;

40: a first clutch ring; 40a, 40 b: an axial side; 41: an outer ratchet; 42: a first ratchet; 50: a second clutch ring;

50a, 50 b: an axial side; 501: first ring body 51, 54: a spline; 502: a second ring body; 52: a second ratchet;

53. 531, 532, 533, 534: a first magnet; 531a, 532 a: a first end; 531b, 532 b: a second end;

60: a magnetic ring; 60a, 60 b: an axial side; 61. 611, 612, 613, 614: a second magnet; 62: a friction member;

611a, 612 a: a first end; 611b, 612 b: a second end; 63: a second projection; 70: assembling rings; 71: an external thread;

72: an inner ratchet; d1: clockwise direction; d2: a counterclockwise direction; l1: a first axial length; l2: a second axial length.

Detailed Description

The present invention will now be described in further detail by way of examples, which are to be construed as illustrative only and not as limiting the practice of the invention.

Referring to fig. 3A and 4A, in conjunction with fig. 5, 6A, 7A and 9A, a bicycle hub structure is disclosed, which includes a hub body 10, a ratchet seat 20, a spindle 30, a first clutch ring 40, a second clutch ring 50, a magnetic ring 60 and an assembling ring 70.

The inner periphery of one end 11 of the hub body 10 facing the ratchet seat 20 is provided with a threaded portion 12.

The ratchet seat 20 is assembled on one side of the hub body 10, an inner gear ring 22 is disposed on an inner periphery of one end 21 of the hub body 10, the ratchet seat 20 is assembled with a freewheel set (not shown) of a bicycle, the freewheel set is engaged with a chain, when a user steps on pedals of the bicycle, the chain drives the freewheel set and the ratchet seat 20 to rotate in a clockwise direction D1 or a counterclockwise direction D2, at least one first protrusion 23 is disposed on an inner periphery of the ratchet seat 20 adjacent to the inner gear ring 22, and at least one receiving groove 24 recessed relative to the first protrusion 23, at least one first protrusion 23 is disposed alternately with the at least one receiving groove 24, the receiving groove 24 has a first end 24a and a second end 24b, and further, a plurality of first protrusions 23 may be disposed equidistantly on an inner periphery of the ratchet seat 20. In this embodiment, two first protrusions 23 are oppositely disposed on the inner periphery of the ratchet seat 20, and two receiving grooves 24 are respectively disposed between the two first protrusions 23, and the two second protrusions 23 are spaced from each other by an angle of 180 °.

The mandrel 30 penetrates through the hub body 10 and the ratchet seat 20, the hub body 10, the ratchet seat 20 and the mandrel 30 are connected by a plurality of bearings, in the embodiment, the ratchet seat 20 and the mandrel 30 are connected by a first bearing 31 and a second bearing 32, the hub body 10 and the mandrel 30 are connected by a third bearing 33 and a fourth bearing 34, a sleeve 35 is arranged between the first bearing 31 and the second bearing 32, another sleeve 36 is arranged between the second bearing 32 and the third bearing 33, and the sleeves 35 and 36 are sleeved on the mandrel 30 in a tight fit manner, so that the first bearing 31, the second bearing 32 and the third bearing 33 are prevented from sliding. The spindle 30 includes two bushings 37 respectively mounted on both ends of the spindle 30, the bushings 37 being used for fixing a rear lower fork (not shown) of a bicycle frame. With the above-described structure, the bush 37 fixes the spindle 30 to the frame, and the plurality of bearings allow the hub body 10 and the ratchet seat 20 to rotate relative to the spindle 30.

The first clutch ring 40 is sleeved on the sleeve 36 and mounted inside the hub body 10, the first clutch ring 40 has an axial side surface 40a facing the ratchet seat 20 and another axial side surface 40b opposite to the axial side surface 40a, the first clutch ring 40 has a plurality of outer ratchet teeth 41 around its radial periphery, and a plurality of first ratchet teeth 42 around the axial side surface 40a facing the ratchet seat 20, the first clutch ring 40 has magnetism, for example, made of magnetic metal or additionally provided with magnetic metal.

Referring to fig. 5 and 6A, the second clutch ring 50 is sleeved on the sleeve 36 and disposed inside the ratchet seat 20 and adjacent to the first clutch ring 40, the second clutch ring 50 has an axial side 50a facing the hub body 10 and another axial side 50b opposite to the axial side 50a, a plurality of splines 51 are disposed on a radial outer peripheral ring of the second clutch ring 50, the splines 51 are engaged with the inner toothed ring 22 of the ratchet seat 20 to enable the ratchet seat 20 to drive the second clutch ring 50 to rotate, a plurality of second ratchet teeth 52 are disposed on an axial side 40a of the second clutch ring 50 facing the first clutch ring 40, the second ratchet teeth 52 are engaged with the first ratchet teeth 42 of the first clutch ring 40 to enable the second clutch ring 50 to drive the first clutch ring 40 to rotate, in this embodiment, a plurality of first magnets 53 are equidistantly embedded on an axial surface of the second clutch ring 50 facing the magnetic ring 60, one end of the first magnets 53 is S-pole, the other end is an N pole, and the magnetic forces at the two adjacent ends of the first magnets 53 repel each other and have the same magnetic pole.

In addition, referring to fig. 3B and 4B, in the second embodiment of the present invention, the second clutch ring 50 includes a first ring 501 adjacent to the first clutch ring 40 and a second ring 502 adjacent to the magnetic ring 60, the plurality of first magnets 53 are disposed on the second ring 502 and coupled to the inner ring 22 by a plurality of splines 54 to rotate together with the second clutch ring 50, and a plurality of second ratchet teeth 52 are disposed around a radial surface of the first ring 501 facing the first clutch ring 40.

Referring to fig. 7A, in the present embodiment, the second clutch ring 50 is provided with four first magnets 531, 532, 533, 534 equidistantly and annularly distributed on the second clutch ring 50, wherein a first end 531a of the first magnet 531 is an S-pole, and a second end 531b of the first magnet 531 is an N-pole; the other first magnet 532 is adjacent to the first magnet 531, a first end 532a of the other first magnet 532 is adjacent to the first end 531a of the first magnet 531, a second end 532b of the other first magnet 532 is remote from the first magnet 531, the first end 532a of the other first magnet 532 is S-pole, and the second end 532b is N-pole.

The magnetic ring 60 is sleeved on the second sleeve 36 and installed inside the ratchet seat 20, and the magnetic ring 60 is installed between the second bearing 32 and the second clutch ring 50, the magnetic ring 60 has an axial side surface 60a facing the hub body 10 and another axial side surface 60b opposite to the axial side surface 60a, the outer periphery of the magnetic ring 60 matches with the inner periphery of the ratchet seat 20 in a configuration manner, a plurality of second magnets 61 are embedded in the magnetic ring 60 in an annular and equidistant manner, the plurality of second magnets 61 are arranged opposite to the plurality of first magnets 53 of the second clutch ring 50, one end of each second magnet 61 is an S pole, the other end is an N pole, and two adjacent ends of the plurality of second magnets 61 repel each other by magnetic force, and the two adjacent ends can have the same magnetic pole.

Referring to fig. 7A, in the present embodiment, the magnetic ring 60 is provided with four second magnets 611, 612, 613, 614 distributed on the magnetic ring 60 in an equidistant ring shape, the second magnets 611, 612, 613, 614 are separated from each other by an angle of 90 °, the first end 611a of the second magnet 611 is an S-pole, and the second end 611b of the second magnet 611 is an N-pole; the second magnet 612 is adjacent to the first magnet 611, a first end 612a of the second magnet 612 is adjacent to the first end 611a of the second magnet 611, a second end 612b of the second magnet 612 is away from the second magnet 611, the first end 612a of the second magnet 612 is S-pole, and the second end 612b of the second magnet 612 is N-pole.

A friction member 62, in this embodiment, an O-ring, is disposed between the magnetic ring 60 and the sleeve 36 to provide a friction force between the magnetic ring 60 and the sleeve 36, so that the magnetic ring 60 is tightly fitted with the sleeve 36 via the friction member 62 without slipping, an outer periphery of the magnetic ring 60 is engaged with an inner periphery of the ratchet seat 20, an outer periphery of the magnetic ring 60 is provided with at least one second protrusion 63, and the at least one second protrusion 63 is engaged with the at least one receiving groove 24 of the ratchet seat 20. In this embodiment, the magnetic ring 60 has two second protrusions 63, the two second protrusions 63 are respectively disposed in the two receiving grooves 24 of the ratchet seat 20, the receiving grooves 24 provide a space for the second protrusions 63 to radially displace, and the two second protrusions 63 are spaced apart from each other by an angle of 180 °.

The assembling ring 70 has an external thread 71 on the outer circumference thereof, the external thread 71 is screwed with the thread part 12 of the hub body 10, a plurality of internal ratchet teeth 72 are provided on the inner circumference of the assembling ring 70, and the internal ratchet teeth 72 are engaged with the external ratchet teeth 41 of the first engaging ring 40. The companion ring 70 has a first axial length L1 and the first clutch ring 40 has a second axial length L2, the first axial length L1 of the companion ring 70 being greater than the second axial length L2 of the first clutch ring 40 to provide space for the first clutch ring 40 to move axially.

During assembly, the magnetic ring 60 is installed in the ratchet seat 20 and contacts with the axial side surface 50b of the second clutch ring 50 away from the hub body 10, the outer periphery of the magnetic ring 60 is matched with the inner periphery of the ratchet seat 20, the second protruding portion 63 of the magnetic ring 60 is matched with the accommodating groove 24 of the ratchet seat 20, the second magnet 61 of the magnetic ring 60 is arranged opposite to the first magnet 53 of the second clutch ring 50, and the spline 51 on the outer periphery of the second clutch ring 50 is matched with the inner gear ring 22 on the inner periphery of the ratchet seat 20, so as to form a first torque transmission mechanism; and the second ratchet teeth 52 of the second clutch ring 50 are engaged with the first ratchet teeth 42 of the first clutch ring 40, which is the second torque transmission mechanism, the external thread 71 of the companion ring 70 is threadedly engaged with the threaded portion 12 of the hub body 10, and the internal ratchet teeth 72 of the companion ring 70 are engaged with the external ratchet teeth 41 of the first clutch ring 40, which is the third torque transmission mechanism. The above-mentioned structures are assembled in the sleeve 36 and are disposed between the second bearing 32 and the third bearing 33.

With the above structure, referring to fig. 5, fig. 6A, fig. 7A, fig. 8B and fig. 9A, when the bicycle pedal is being stepped on, the ratchet seat 20 is driven to rotate clockwise D1, so as to drive the hub body 10 and the ratchet seat 20 to rotate together, as viewed from the direction from the ratchet seat 20 to the hub body 10. At this time, the first magnet 53 of the second clutch ring 50 and the second magnet 61 of the magnetic ring 60 are magnetically repelled, the N-pole of the first magnet 53 is opposite to the N-pole of the second magnet 61, the S-pole of the first magnet 53 is opposite to the S-pole of the second magnet 61, and the magnetic force lines passing through the first clutch ring 40 are increased. Therefore, the magnetic force between the first magnet 53 of the second clutch ring 50 and the second magnet 61 of the magnetic ring 60 attracts the first clutch ring 40, so that the first clutch ring 40 moves axially toward the second clutch ring 50, and the first ratchet 42 engages with the second ratchet 52 of the second clutch ring 50, so that the ratchet seat 20 drives the hub body 10 to rotate, thereby driving the bicycle wheel to move forward.

When the bicycle stops being stepped on, the ratchet seat 20 is not driven by the chain to stop rotating, the hub body 10 continuously rotates due to inertia and drives the bicycle to move forward, and at this time, the second ratchet teeth 52 of the second clutch ring 50 are disengaged from the first ratchet teeth 42 of the first clutch ring 40 due to the tooth-shaped structure of the ratchet teeth.

Referring to fig. 5, fig. 6B, fig. 7B, fig. 8A, fig. 8C and fig. 9B, when the bicycle pedal is reversely stepped on, the ratchet seat 20 is driven to rotate in the counterclockwise direction D2 to rotate the ratchet seat 20 and the hub body 10 in the opposite direction when the ratchet seat 20 is viewed in the direction of the hub body 10. At this time, the second protrusion 63 of the magnetic ring 60 is pushed by the first protrusion 23 of the ratchet seat 20, so that the second magnet 61 and the first magnet 53 are attracted to each other, the N-pole of the first magnet 53 is opposite to the S-pole of the second magnet 61, and the S-pole of the first magnet 53 is opposite to the N-pole of the second magnet 61, thereby reducing the magnetic force lines entering the first clutch ring 40, so that the magnetic force attracting the first clutch ring 40 toward the second clutch ring 50 is reduced, so that when the first ratchet 42 of the first clutch ring 40 is pushed by the second ratchet 52 of the second clutch ring 50 to be away from each other, the magnetic attraction does not cause the engagement to be restored, thereby reducing the contact between the first ratchet 42 of the first clutch ring 40 and the second ratchet 52 of the second clutch ring 50, and reducing noise and wear caused by the friction between the first ratchet 42 of the first clutch ring 40 and the second ratchet 52 of the second clutch ring 50.

As can be seen, the ratchet seat 20 of the present invention has a first state and a second state, and in the first state, the magnetic forces of the first magnets 531, 532, 533, 534 of the second clutch ring 50 and the second magnets 611, 612, 613, 614 of the magnetic ring 60 are repulsive, and the magnetic force lines of the first clutch ring 40 are increased, so that the first clutch ring 40 can be attracted, the first and second clutch rings 40, 50 can be engaged, and the torque can be transmitted from the ratchet seat 20 to the hub body 10 through the second clutch ring 50 and the first clutch ring 40. In the second state, the magnetic attraction of the first magnet 53 and the magnetic ring 60 to the first clutch ring 40 is smaller than that in the first state, the magnetic force attracting the first clutch ring 40 toward the second clutch ring 50 is reduced, the first ratchet 42 of the first clutch ring 40 is pushed by the second ratchet 52 of the first ring 51 of the second clutch ring 50 to be away from the first ratchet, and the magnetic attraction does not cause the return engagement, so that the friction between the first ratchet 42 of the first clutch ring 40 and the second ratchet 52 of the first ring 51 can be reduced.

In the present embodiment, the inner periphery of the ratchet seat 20 is provided with two opposite first protrusions 23 and two accommodating grooves 24 disposed between the two first protrusions 23, the two first protrusions 23 are spaced from each other by an angle of 180 °, the magnetic ring 60 is provided with two second protrusions 63, the two second protrusions 63 are respectively disposed in the two accommodating grooves 24, the two second protrusions 63 are spaced from each other by an angle of 180 °, the second clutch ring 50 is provided with four first magnets 531, 532, 533 and 534 equidistantly and annularly distributed on the second clutch ring 50, each of the first magnets 531, 532, 533 and 534 is spaced from each other by an angle of 90 °, the magnetic ring 60 is provided with four second magnets 611, 612, 613 and 614 equidistantly and annularly distributed on the magnetic ring 60, and each of the second magnets 611, 612, 613 and 614 is spaced from each other by an angle of 90 °.

When the pedal of the bicycle is being stepped on, the first magnets 531, 532, 533, and 534 and the second magnets 611, 612, 613, and 614 are disposed to face each other, the first magnet 531 and the second magnet 611 are disposed to face each other, the first magnet 532 and the second magnet 612 are disposed to face each other, the first magnet 533 and the second magnet 613 are disposed to face each other, the first magnet 534 and the second magnet 614 are disposed to face each other, and the first magnets 531, 532, 533, and 534 and the second magnets 611, 612, 613, and 614 magnetically repel each other to increase magnetic lines of force with the first clutch ring 40.

When the pedal of the bicycle is stepped backwards, the first protrusion 23 of the ratchet seat 20 pushes against the second protrusion 63 of the magnetic ring 60 to radially move by an angle of 90 °, so that each of the first magnets 531, 532, 533, 534 and the second magnets 611, 612, 613, 614 radially move by an angle of 90 ° to a magnetically attracted position. At this time, the first magnet 531 and the second magnet 614 are oppositely disposed, the first magnet 532 and the second magnet 611 are oppositely disposed, the first magnet 533 and the second magnet 612 are oppositely disposed, the first magnet 534 and the second magnet 613 are oppositely disposed, and the first magnets 531, 532, 533, 534 and the second magnets 611, 612, 613, 614 are magnetically attracted to reduce the magnetic force line with the first clutch ring 40, that is, the magnetic force attracting the first clutch ring 40, thereby reducing noise and abrasion generated by friction between the first ratchet 42 of the first clutch ring 40 and the second ratchet 52 of the second clutch ring 50.

Therefore, the present invention is sufficient to solve the problem of noise and abrasion caused by friction when the ratchet teeth of the ratchet ring contact the wedge-shaped teeth of the flywheel due to the magnetic property of the collar and the ratchet ring, which is caused by the fact that the permanent magnet is pushed out of the collar by the ratchet ring and displaced toward the inner side of the wheel shaft when the pedal of the bicycle is pedaled in reverse as shown in fig. 1 and 2.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.