TWI752637B - bicycle hub - Google Patents

Abstract

A bicycle wheel hub includes a mandrel, a body combined with the mandrel, a flywheel seat and a clutch unit. The clutch unit includes a first ratchet ring and a second ratchet ring, and the first ratchet ring and the second ratchet ring are respectively combined with the main body and the flywheel seat. The first ratchet ring has a first inclined wall, the second ratchet ring has a second inclined wall facing the first inclined wall, and it is characterized in that: the minimum number of teeth of the first ratchet teeth on the first inclined wall is 72 teeth; the number of teeth of the second ratchet on the second inclined wall is smaller than that of the first ratchet. With the above structure design, when the first ratchet ring is engaged with the second ratchet ring, the flywheel seat can stably transmit the body and reduce the weight of the entire bicycle hub.

Description

bicycle hub

The invention relates to the field of bicycle transmission; in particular, it refers to a bicycle wheel hub. The clutch unit in the wheel hub utilizes the clutch driving mode of axial displacement to achieve the purpose that the bicycle can be rotated and driven in one direction.

A bicycle with rear shifting function, the rear wheel hub has a flywheel seat, and a set of flywheels composed of a plurality of different chainrings are arranged on the flywheel seat, for the chain of the bicycle to be wound around one of the chainrings on the bicycle, and through the rear derailleur of the bicycle, the chain can be changed to other chainrings to achieve the function of shifting.

This kind of wheel hub further includes a set of clutch units, which are used as the drive connection interface for connecting the body of the rear wheel spokes of the bicycle and the flywheel seat in the wheel hub, so that when the flywheel seat receives a positive driving force, the body is driven to rotate, And when the flywheel seat is subjected to a reverse driving force, the driving connection relationship between the flywheel seat and the body is disconnected. There are different types of clutch units for the above purposes on the market. Some use the movable ratchet teeth and the inner gear ring arranged along the radial direction of the hub spindle to achieve the clutch function, and there are also two ratchet teeth rings, one of which can be used along the hub spindle. Axial reciprocating movement to achieve clutch effect.

With the development of bicycle production technology and the change of bicycle usage, the lightweight of bicycles has become a very important demand in the bicycle market in recent years and the goal that bicycle manufacturers focus on pursuing. For the hub provided with the latter clutch unit, reducing the number of teeth of one of the two ratchet rings can not only provide sufficient meshing force between the two ratchet rings, but also reduce the weight of the hub. Therefore, how to find the number of teeth of the ratchet ring that can both reduce weight and provide sufficient meshing force is a technical issue that many related manufacturers are currently focusing on.

In view of this, the purpose of the present invention is to provide a bicycle wheel hub, which has a stable transmission effect and reduces the overall weight.

In order to achieve the above object, the bicycle hub provided by the present invention includes a mandrel, a main body, a flywheel seat and a clutch unit. The mandrel is used as the rotation axis of the hub of a bicycle; the body is rotatably coupled to the mandrel for coupling the spokes of the bicycle wheel; the flywheel seat is rotatably coupled to the mandrel is used to combine the rear flywheel of the bicycle; the clutch unit includes a first ratchet ring and a second ratchet ring, wherein the first ratchet ring has a first inclined wall, and the first inclined wall There are a plurality of first ratchet teeth arranged along the first inclined wall, wherein the minimum number of teeth of the first ratchet teeth is 72; the second ratchet tooth ring has a second inclined wall, and the second inclined wall faces The first inclined wall has a plurality of second ratchet teeth arranged along the second inclined wall, wherein the number of teeth of the second ratchet teeth is smaller than that of the first ratchet teeth. One of the first ratchet ring and the second ratchet ring is combined with the body in a manner that can drive the body to rotate, and the other is combined with the flywheel seat in a manner that can drive the flywheel seat to rotate; the One of the first ratchet ring and the second ratchet ring is movable along the axial direction of the mandrel between a first position and a second position, wherein the first position is the first ratchet teeth The position of engaging with the second ratchet teeth is the position where the first ratchet teeth and the second ratchet teeth are disengaged.

The number of teeth of the second ratchet is divided by the number of teeth of the first ratchet, and the ratio of the number of teeth of the first ratchet to the number of teeth of the second ratchet can be 2, 3, 5, 7 or a multiple thereof.

The number of teeth of the first ratchet is a multiple of 18, and the minimum number of teeth of the second ratchet is 18.

The maximum number of teeth of the first ratchet is 180 teeth.

The distance between any two adjacent second ratchet teeth is not less than the distance between any two adjacent first ratchet teeth.

The second ratchet ring can move between the first position and the second position along the axial direction of the mandrel; the clutch unit includes a reset piece; the reset piece is connected to the second ratchet ring and applies With a restoring force of the second ratchet ring, the second ratchet ring is in the first position.

Wherein, the reset member is one of a spring, a magnet or a shrapnel.

The flywheel seat is provided with a plurality of first spline parts, and each of the first spline parts defines a long axis; one of the first ratchet ring or the second ratchet ring is provided with a plurality of first spline parts Two spline parts; the second spline parts are combined with the second spline parts in a manner that can be displaced along the long axial direction of the first spline parts.

The long axis of each of the first spline portions is parallel to the axis of the mandrel.

The long axis of each of the first spline parts is obliquely intersected with the axial direction of the mandrel, and the first spline parts form a right-hand thread part; the rotation direction of the right-hand thread part is the same as that of the bicycle flywheel The rotation direction of the flywheel seat driven by being stepped on is the same; the second spline parts are arranged corresponding to the right-handed threaded parts.

The effect of the present invention is that the number of teeth of the first ratchet teeth of the first ratchet ring and the second ratchet teeth of the second ratchet ring are not equal, so that the flywheel seat can pass through the first ratchet ring and the second ratchet ring. The meshing relationship of the two ratchet rings stably drives the body to act synchronously; in addition, the weight of the overall bicycle hub is lighter than that of conventional bicycle hubs; moreover, there is no excessive noise when riding a bicycle.

In order to describe the present invention more clearly, preferred embodiments are given and described in detail with the drawings as follows. Referring to FIGS. 1 to 5 , a bicycle hub 100 according to a preferred embodiment of the present invention is shown, which includes a spindle 10 , a main body 20 , a flywheel seat 30 and a clutch unit 40 .

The spindle 10 of the bicycle hub 100 is combined with a rear fork of a bicycle (not shown in the figure), and serves as the rotation axis of the bicycle hub 100 . The body 20 is rotatably coupled to the mandrel 10 and has a plurality of through holes 20a. Two ends of the bicycle spokes are respectively connected to the through holes 20a and the rim of the bicycle, whereby when the body 20 rotates, the spokes of the bicycle can drive the rim of the bicycle to rotate. The flywheel seat 30 is also rotatably coupled to the spindle 10 and used for coupling the rear flywheel of the bicycle. In this embodiment, the structure for realizing the combination of the main body 20 or the flywheel seat 30 on the mandrel 10 includes a plurality of bearings 50 , as shown in FIG. 5 , the body 20 is indirectly connected to the core through two bearings 50 The shaft 10, the flywheel seat 30 is also indirectly connected to the mandrel 10 by means of the two-pin 50, so that the body 20 and the flywheel seat 30 can rotate relative to the mandrel 10 about the axial direction of the mandrel 10 , while the spindle 10 does not rotate. However, the number of the aforementioned bearing is not limited thereto.

The body 20 and the flywheel seat 30 are indirectly connected by the clutch unit 40 . The clutch unit 40 is disposed in an accommodating groove 22 of the main body 20 , and includes a first ratchet ring 42 , a second ratchet ring 44 and a reset member 46 . As shown in FIG. 2 and FIG. 3 , the first ratchet ring 42 is coupled to the main body 20 in a manner that can drive the main body 20 to rotate. In this embodiment, the first ratchet ring 42 is screw-to-lock. The first ratchet ring 42 is fixed on the body 20, but those skilled in the art can also fix the first ratchet ring 42 on the body 20 in other ways, such as a C-ring, a screw, etc., and the first ratchet ring 42 has A first inclined wall 422 . The first inclined wall 422 has a plurality of first ratchet teeth 424 arranged along the first inclined wall 422 .

The second ratchet ring 44 has a plurality of second spline portions 442 on the inner peripheral surface thereof, and the outer peripheral edge of the flywheel seat 30 has a plurality of first spline portions 32 , wherein the first spline portions 32 are located at Among the second spline portions 442 , in this way, the second spline portions 442 of the second ratchet ring 44 can slide along the first spline portions 32 , and the second ratchet ring 44 It can be driven to rotate by the flywheel seat 30 . One side of the second ratchet ring 44 abuts against the reset member 46 , and the other side has a second inclined wall 444 facing the first inclined wall 422 , and the second inclined wall 444 has a plurality of edges. The second ratchet teeth 446 are arranged on the second inclined wall 444 , and the second ratchet teeth 446 can be engaged with or disengaged from the first ratchet teeth 424 . The number of teeth of the second ratchet teeth 446 is smaller than the number of teeth of the first ratchet teeth 424 , and the distance between any two adjacent second ratchet teeth 446 is not less than the distance between any two adjacent first ratchet teeth 424 , so as to facilitate the stable combination of the first ratchet ring 42 and the second ratchet ring 44 .

One end of the reset member 46 abuts against the bottom of the accommodating groove 22 , and the other end abuts against the second ratchet ring 44 , and a restoring force (not shown) is applied to the second ratchet ring 44 . The force is the axial force in the direction of the first ratchet ring 42 . In this embodiment, the restoring member 46 is a spring, but it is not limited to this. Components that provide restoring force, such as shrapnel, magnets, etc. commonly found in bicycle hubs, can be substitutes for springs.

In order to reduce the weight of the bicycle, reducing the number of teeth of the ratchet ring of the clutch unit is a means of reducing the weight, which is also the content of the present invention. As far as the clutch unit of the present invention is concerned, considering that during the operation of the clutch unit, the first ratchet ring and the second ratchet ring in the clutch unit are prone to fatigue damage due to repeated torques. , and under the condition that the number of the first ratchet teeth of the first ratchet ring is a multiple of 9, in this embodiment, the number of the first ratchet teeth is further selected to be a multiple of 18, and the number of the first ratchet teeth is gradually increased, And increase or decrease the number of the second ratchet teeth of the second ratchet ring for testing, it is found that when the central angle between any two adjacent first ratchet teeth is 5 degrees, it means that the minimum number of teeth of the first ratchet teeth is 72 teeth, so that the gap between any two adjacent first ratchet teeth is too large, so that when the clutch unit is in use, high loudness is generated due to the play between the first ratchet teeth and the second ratchet teeth.

Under the condition that the minimum number of teeth of the first ratchet teeth is 72 teeth, continuously reduce the number of teeth of the second ratchet teeth of the second ratchet ring for testing, and found that the minimum number of teeth of the second ratchet teeth of the second ratchet ring is 18 teeth , and the first ratchet teeth and the second ratchet teeth can still be stably engaged, which has a good transmission effect and can reduce the weight of the second ratchet tooth ring.

Secondly, under the condition that the transmission effect is not changed, the number of the first ratchet teeth of the first ratchet ring is continuously increased as required, such as 90 teeth, 126 teeth or 144 teeth, and the second ratchet ring will also correspond accordingly. The number of teeth is increased, so as to avoid that the number of ratchet teeth of the first ratchet ring and the second ratchet ring is too large to cause insufficient occlusal force. For example, the ratio of the number of ratchet teeth of the first ratchet ring to the number of ratchet teeth of the second ratchet ring may be, but not limited to, 90:18, 90:45, 126:18, 144:18, 144:36 or 144 :72, compared with the conventional clutch unit structure, it can achieve the purpose of light weight.

Furthermore, in the process of continuously increasing the number of the first ratchet teeth of the first ratchet ring, it is found that the maximum number of teeth of the first ratchet tooth is 180, so as to prevent the size of the first ratchet tooth from being too small and affecting its relationship with the first ratchet tooth. The meshing effect between the two ratchet teeth.

In this experiment, the following conclusions were obtained: the ratio of the number of ratchet teeth of the first ratchet ring to the number of ratchet teeth of the second ratchet ring is a better ratio relationship of 2, 3, 5, 7 or its multiples. More specifically, when the number of ratchet teeth of the first ratchet ring is a multiple of the number of ratchet teeth of the second ratchet ring, the ratchet teeth of the second ratchet ring equally engage the ratchet teeth of the first ratchet ring, Make the force transmission more uniform, avoid partial stress concentration and accelerate the fatigue phenomenon. In this embodiment, the ratio of the number of ratchets of the first ratchet teeth 424 to the number of ratchet teeth of the second ratchet teeth 446 is 72:18, which means the ratio is 4.

As shown in FIGS. 6 to 9 , the second ratchet ring 44 can move between a first position P1 and a second position P2 along the axial direction of the mandrel 10 . 6 and 7 , when the flywheel of the bicycle is stepped on to drive the flywheel seat 30 to rotate counterclockwise, the second ratchet ring 44 is in the first position P1, and the second ratchets 446 and the The first ratchet teeth 424 mesh with each other, and the flywheel seat 30 drives the body 20 to rotate synchronously through the second ratchet ring 44 and the first ratchet ring 42 , thereby driving the wheels of the bicycle to move forward. 8 and 9, when the flywheel seat 30 is rotated clockwise by an external force, the second ratchet teeth 446 of the second ratchet ring 44 will slide along the tooth surfaces of the first ratchet teeth 424, The second ratchet ring 44 is moved from the first position P1 to the second position P2, the second ratchet teeth 446 are separated from the first ratchet teeth 424, and the reset member 46 is compressed. As such, the flywheel seat 30 will idle relative to the body 20 . At the same time, the restoring force can make the second ratchet ring 44 return to the first position P1 from the second position P2, so that the second ratchet ring 44 and the first ratchet ring 42 are engaged with each other again.

In addition, the first spline portions 32 of the flywheel seat 30 are protruded and formed along a long axis A parallel to the axial direction X of the flywheel seat 30 as disclosed in FIG. 10 . Referring to FIGS. 11 and 12 , In another preferred embodiment of the flywheel seat 30A and the second ratchet ring 44A of the present invention, the long axis A of the first spline portions 32A obliquely intersects with the axis X of the flywheel seat 30A, and the first The spline portion 32A forms a right-hand thread portion 32B, and the rotation direction of the right-hand thread portion 32B is the same as the counterclockwise rotation direction of the flywheel seat 30A. The second ratchet ring 44A has a pair of thread segments 442B corresponding to the right-handed thread portion 32B, and the gaps between the threads of the thread segments 442B constitute the second spline portions 442A. With the above structure, when the flywheel of the bicycle is stepped on to drive the flywheel seat 30A to rotate counterclockwise, the ratchet teeth of the second ratchet ring 44A are loaded by the ratchet teeth of the first ratchet ring, so that these The second spline portions 442A move toward the first ratchet ring along the long axis A of the first spline portions 32A, thereby enhancing the mutual engagement effect of the second ratchet ring 44A and the first ratchet ring On the contrary, when the flywheel seat 30A is rotated clockwise by an external force, the second spline portions 442A of the second ratchet ring 44A will move away from the first spline portion 32A along the long axis A of the first spline portion 32A. The ratchet ring helps to disengage the second ratchet ring 44A from the first ratchet ring.

In other embodiments, the second ratchet ring can drive the body to rotate, and the first ratchet ring can drive the flywheel seat to rotate to achieve the same transmission effect. In addition, optionally, the reset member is connected to the first ratchet ring, so that the first ratchet ring can be displaced along the axial direction of the mandrel, thereby achieving the relationship between the first ratchet ring and the second ratchet ring clutch relationship.

To sum up, the number of teeth of the first ratchet teeth of the first ratchet ring and the second ratchet teeth of the second ratchet ring of the present invention is designed so that the clutch unit of the present invention is compared with the conventional full-engagement clutch unit. , weight reduction. In addition, through the design of the ratio of the number of teeth of the first ratchet to the number of teeth of the second ratchet and the design of the number of ratchets, the contact surface of the first ratchet ring and the second ratchet ring forms a sufficient meshing strength, and the flywheel seat can be stable ground to drive the body to act synchronously. Furthermore, the aforementioned ratio design can avoid the situation of the conventional clutch unit, such as the ratio of the number of the first ratchet teeth to the number of the second ratchet teeth is too large, which leads to the loudness of the bicycle when riding, resulting in poor user experience.

The above descriptions are only preferred feasible embodiments of the present invention, and any equivalent changes made by applying the description of the present invention and the scope of the patent application should be included in the patent scope of the present invention.

[this invention] 100: Bicycle Hub 10: Mandrel 20: Ontology 20a: Through hole 22: accommodating slot 30: Flywheel seat 30A: flywheel seat 32: The first spline part 32A: The first spline part 32B: Right-hand thread 40: clutch unit 42: The first ratchet ring 422: The first inclined wall 424: First Ratchet 44: Second Ratchet Ring 44A: Second ratchet ring 442: Second spline part 442A: Second spline part 442B: Threaded segment 444: Second inclined wall 446: Second Ratchet 46: reset piece 50: Palin P1: first position P2: Second position X: Axial A: Long axis

FIG. 1 is a perspective view of a bicycle hub according to a preferred embodiment of the present invention. . FIG. 2 is a partial exploded view of the bicycle hub of the above preferred embodiment. FIG. 3 is another view of FIG. 2 . FIG. 4 is a front view of the bicycle hub of the above preferred embodiment. FIG. 5 is a cross-sectional view taken along the line 5-5 of FIG. 4 . FIG. 6 is a cross-sectional view taken along the line 6-6 of FIG. 4 . FIG. 7 is a partial enlarged view of part A of FIG. 5 . FIG. 8 is similar to FIG. 6 , showing that the first ratchet ring is disengaged from the second ratchet ring. Fig. 9 is similar to Fig. 7, showing that the first ratchet ring is disengaged from the second ratchet ring and the spring is compressed. FIG. 10 is a perspective view of the flywheel seat of the bicycle hub according to the above preferred embodiment. 11 is a perspective view of a second ratchet ring and a flywheel seat of a bicycle hub according to another preferred embodiment. FIG. 12 is a right side view of the flywheel seat of FIG. 11 .

100: Bicycle Hub

20: Ontology

30: Flywheel seat

Claims (9)

A bicycle wheel hub, comprising: a mandrel, used as the rotation axis of a bicycle wheel hub; a body, rotatably combined with the mandrel, used to combine the spokes of the bicycle wheel; a flywheel seat, can is rotatably coupled to the mandrel for coupling the rear flywheel of the bicycle; a clutch unit includes a first ratchet ring and a second ratchet ring, wherein the first ratchet ring has a first oblique wall, and the first inclined wall has a plurality of first ratchet teeth arranged along the first inclined wall, wherein the minimum number of teeth of the first ratchet teeth is 72 teeth, and the maximum number of teeth of the first ratchet teeth is 180 teeth; the The second ratchet ring has a second inclined wall, and the second inclined wall is disposed corresponding to the first inclined wall, and has a plurality of second ratchet teeth arranged along the second inclined wall, wherein the second ratchet teeth The number of teeth is less than the number of teeth of the first ratchet; wherein, one of the first ratchet ring and the second ratchet ring is combined with the body in a way that can drive the body to rotate, and the other can drive the flywheel The seat is coupled to the flywheel seat in a rotational manner; one of the first ratchet ring and the second ratchet ring can move between a first position and a second position along the axial direction of the mandrel, wherein The first position is a position where the first ratchet teeth and the second ratchet teeth are engaged, and the second position is a position where the first ratchet teeth and the second ratchet teeth are disengaged. The bicycle hub of claim 1, wherein the number of teeth of the second ratchet is divided by the number of teeth of the first ratchet, and the ratio of the number of teeth of the first ratchet to the number of teeth of the second ratchet can be 2 or 3 , 5, 7 or multiples thereof. The bicycle hub of claim 2, wherein the number of teeth of the first ratchet is a multiple of 18, and the minimum number of teeth of the second ratchet is 18. The bicycle hub according to claim 1, wherein the distance between any two adjacent second ratchet teeth is not less than the distance between any two adjacent first ratchet teeth. The bicycle hub as claimed in claim 1, wherein the second ratchet ring can move between the first position and the second position along the axial direction of the spindle; the clutch unit comprises a reset member; the reset member The second ratchet ring is connected, and a restoring force is applied to the second ratchet ring, so that the second ratchet ring is in the first position. The bicycle hub as claimed in claim 5, wherein the reset member is one of a spring, a magnet or a spring. The bicycle hub as claimed in claim 1, wherein the flywheel seat is provided with a plurality of first spline parts, and each of the first spline parts defines a long axis; the first ratchet ring or the second ratchet teeth One of the rings is provided with a plurality of second spline parts; the second spline parts are combined with the second spline parts in a manner that can be displaced along the long axial direction of the first spline parts. The bicycle hub of claim 7, wherein the long axis of each of the first spline portions is parallel to the axis of the spindle. The bicycle hub as claimed in claim 7, wherein the long axial direction of each of the first spline parts obliquely intersects with the axial direction of the mandrel, and the first spline parts form a right-handed threaded part; the right-handed The rotation direction of the threaded portion is the same as the rotation direction of the flywheel seat of the bicycle being driven to rotate by being stepped on; the second spline portions are arranged corresponding to the right-handed threaded portion.

Images