TW201940379A - Sprocket capable of making sprocket light-weighted and achieving stability while being engaged with the chain at the same time - Google Patents

Abstract

A sprocket comprises a main body, a plurality of first chain teeth and a plurality of second chain teeth, wherein the plurality of first chain teeth and the plurality of second chain teeth are distributed on the perimeter of the main body in a staggered manner. The first chain tooth includes a first root and a first protrusion extended from the first root toward the direction away from the axle center. The second chain tooth includes a second root and a second protrusion extended from the second root toward the direction away from the axle center. The crossed section of the first protrusion is smaller than that of the first root. The crossed section of the second protrusion is smaller than that of the second root and the width thereof is larger than that of the crossed section of the first protrusion. The second protrusion has a ramp extended between the adjacent first protrusion and first root. Thus, the present invention may make the sprocket to be light-weighted and achieve stability while being engaged with the chain at the same time.

Description

Sprocket

The invention relates to a chainring; in particular, it refers to a chainring that can be used on a bicycle and is lightweight.

In addition to serving as a means of transportation for people's daily lives, bicycles are also regarded as one of the tools of sports or competitions because they must be pedaled by humans when riding. Sports or competition bicycles may have different types depending on the venue or event used, and lighter bicycles can greatly improve the performance and performance of riders in terms of speed or distance. Therefore, in addition to the improvement of structure and sturdiness of modern bicycles, weight reduction is also the focus of development for sports or competition bicycles.

The means to achieve the weight reduction of bicycles, in addition to the development of lighter weight frames with equal or higher strength as an alternative, also reduces the weight of other parts without affecting the structural strength, such as reducing the weight of the bicycle chainring . The bicycle's chain disc is connected to the crank and pedal, and can be chained with the flywheel through the chain. When the user steps on the pedal, the chain disc is driven to rotate by the pedal and the crank, and then the flywheel is driven through the chain, causing the rear wheel connected to the flywheel to rotate. The whole bike goes forward. The structure of the chain plate is disc-shaped, and the periphery is provided with a plurality of chain teeth that can be linked with the chain. For weight reduction of the sprocket, in addition to using different materials, the sprocket on the sprocket can also be designed to further reduce weight.

In the prior art, reducing the volume and weight of some of the sprocket teeth in the sprocket can bring about a lightweight effect. For example, as shown in the description and drawings of the Patent No. I585319 of the Republic of China, the invention is a continuous stagger arrangement of sprockets with normal size and sprockets with reduced width. The effect of reducing the weight of the entire chainring.

When the chain disc is chained with the chain, at least half of the teeth are located in the link space of the chain to push the chain. However, in the above-mentioned prior art, the sprocket after the thickness reduction is in contact with the rollers of the chain only in the link space, unlike the other parts of the sprocket, which also contact the chain links. In other words, after the thickness is reduced, The sprocket only has an effect on pushing the chain. Although the weight of the chain disc is achieved, the stability of the chain disc and the chain becomes weaker. When a rider rides a bicycle, especially when pedaling at high speeds or needs to change gears, unstable chaining may cause the chain to fall off and may even cause accidents.

Therefore, it is necessary to develop a new type of chainring to solve the above problems.

In view of this, an object of the present invention is to provide a chain disk, which can take into account both the light weight and the stability of the linkage with the chain to solve the above problems.

In order to achieve the above object, the chain disk provided by the present invention has a main body, a plurality of first sprocket teeth and a plurality of second sprocket teeth, wherein the first sprocket and the second sprocket are distributed on the periphery of the body, and the two are continuously staggered. arrangement. The first sprocket includes a first root portion and a first protruding portion. The first root portion is disposed on a peripheral edge of the body, and the first protruding portion extends from the first root portion in a direction away from the axis of the body. The second sprocket includes a second root portion and a second protruding portion. The second root portion is disposed on a peripheral edge of the body, and the second protruding portion extends from the second root portion in a direction away from the axis of the body. The cross section of the first projection is smaller than the cross section of the first root, the cross section of the second projection is smaller than the cross section of the second root, and the width of the cross section of the second projection is larger than that of the first projection. The width of the cross section. The second protruding portion includes at least one inclined surface that extends between the adjacent first protruding portion and the first root portion.

Another object of the present invention is to provide a chain disc, which can simultaneously achieve both weight reduction and the stability of chain coupling with the chain, and can further reduce stepping resistance.

In order to achieve the above object, the chain disk provided by the present invention has a main body, a plurality of first sprocket teeth and a plurality of second sprocket teeth, wherein the first sprocket and the second sprocket are distributed on the periphery of the body, and the two are continuously staggered arrangement. The first sprocket includes a first root portion and a first protruding portion. The first root portion is disposed on a peripheral edge of the body, and the first protruding portion extends from the first root portion in a direction away from the axis of the body. The second sprocket includes a second root portion and a second protruding portion. The second root portion is disposed on a peripheral edge of the body, and the second protruding portion extends from the second root portion in a direction away from the axis of the body. The cross section of the first protrusion is smaller than the cross section of the first root, and the cross section of the second protrusion is smaller than the cross section of the second root. The width of the cross-section of the second protrusion is greater than the width of the cross-section of the first protrusion, and the height of the second protrusion extending from the second root is greater than the height of the first protrusion extending from the first root. the height of. The second protruding portion includes at least one inclined surface that extends between the adjacent first protruding portion and the first root portion.

Thus, the chain plate of the present invention can achieve the stability of the chain connection with the chain while reducing the overall weight.

In order to explain the present invention more clearly, preferred embodiments are described in detail below with reference to the drawings. Please refer to FIG. 1, which is a schematic diagram of a sprocket 1 according to a specific embodiment of the present invention. In practice, the sprocket 1 can be used on a bicycle, which can be connected to a crank and a pedal and linked with a flywheel through a chain. As shown in FIG. 1, the sprocket 1 has a main body 10, a plurality of first sprocket teeth 12, and a plurality of second sprocket teeth 14. The sprocket body 10 is disc-shaped, and therefore has a shaft center and a peripheral edge 100 located outside the disc. . All the first sprocket 12 and the second sprocket 14 are distributed on the periphery 100, and the first sprocket 12 and the second sprocket 14 are continuously staggered, that is, one first sprocket 12 is adjacent to two The second sprocket 14 is adjacent to the first sprocket 12. When the sprocket 1 and the chain are linked, each of the first sprocket 12 and each of the second sprocket 14 will be detachably engaged in the link space of the chain, thereby pushing the chain to move.

Please refer to FIG. 2 and FIG. 3 together. FIG. 2 is a partial schematic diagram of the chain plate 1 of FIG. 1, and FIG. 3 is a partial schematic diagram of the chain plate 1 of FIG. 1 from another perspective. As shown in FIG. 2 and FIG. 3, the first sprocket 12 further includes a first root portion 120 and a first protruding portion 122. The first root portion 120 is disposed on the peripheral edge 100 of the body 1, and the first protruding portion 122 is formed from the first protruding portion 122. The first portion 120 extends in a direction away from the axis of the main body 10, in other words, the direction of extension is a radial direction toward the outside of the main body 10. In practice, when the chain plate 1 and the chain are linked, the first protruding portion 122 can extend into the space of the chain link and can contact the rollers of the chain. Therefore, when a bicycle rider steps on the pedal, he receives the pedal And the first protrusion 122 of the sprocket 1 rotated by the crank drive can push the roller to make the chain move. In this specific embodiment, the width of the first root portion 120 is substantially the same as the width of the peripheral edge 100 of the body 10, and the width of the first protruding portion 122 is larger near the first root portion 120 and away from the first root portion. The direction of 120 gradually becomes smaller. Therefore, the cross section of the first protruding portion 122 is smaller than the cross section of the first root portion 120.

Similarly, the second sprocket 14 includes a second root portion 140 and a second protruding portion 142. The second root portion 140 is disposed on the peripheral edge 100 of the body 1, and the second protruding portion 142 moves away from the body from the second root portion 140. 10 axis direction. When the chain plate 1 and the chain are linked, the second protruding portion 142 also extends into the space of the chain link and pushes the rollers of the chain, causing the chain to move. Similarly, the width of the second root portion 140 is substantially the same as the width of the peripheral edge 100 of the body 10, and the width of the second protruding portion 142 is larger near the second root portion 140 and gradually moves away from the second root portion 140. It becomes smaller, so the cross section of the second protruding portion 142 is smaller than the cross section of the second root portion 140, but the width of the cross section is larger than the width of the cross section of the first protruding portion 140. In other words, the first protruding portion 122 is a sprocket with a reduced width, which can reduce the overall weight of the sprocket 1.

In addition to the above structure, the second protruding portion 142 of the second sprocket 14 further includes at least one inclined surface 144. In this embodiment, one second protruding portion 142 includes four inclined surfaces 144, which surround the second protruding portion. The portion 142 extends between the two first protruding portions 122 and the first root portion 120 adjacent to the second protruding portion 142. In this embodiment, the second protruding portion 142 is located between the two inclined surfaces 144 on the same side of the disc-shaped structure of the body 10 to form an intersection portion 146. Similarly, the second protruding portion 142 is disc-shaped on the body 10 An intersection section 146 is also formed on the other side.

In addition to the intersection portion on the second protruding portion 142, the inclined surface 144 may also form an intersection portion 146 between the first protruding portion 122 and the first root portion 120. As shown in FIG. 2 and FIG. 3, on one of the side surfaces of the disc-shaped structure of the body 10, the inclined surfaces 144 of the two second protruding portions 142 adjacent to one first protruding portion 122 will respectively extend there. The first protruding portion 122 and the corresponding first root portion 120 intersect with each other, and an intersection portion 146 is also formed at the intersection.

The intersection portion 146 formed by the intersection of the inclined surfaces 144 described above can be used to stabilize the chain when the chain plate 1 is chained with the chain. Please refer to FIGS. 4 and 5. FIG. 4 is a partial schematic diagram of the side of the chain plate 1 of FIG. 2, and FIG. 5 is a partial schematic diagram of the chain plate 1 and the chain 2 of FIG. 2 being chained. As shown in FIG. 4, when viewed from the top surfaces of the first protruding portion 122 and the second protruding portion 142, a plurality of inclined surfaces 144 are respectively formed on both sides of the first protruding portion 122 and the second protruding portion 142. Rendezvous Department 146. In addition, as shown in FIG. 5, when the chain plate 1 and the chain 2 are linked, the second protruding portion 142 can extend into the link space of the chain 2 and is located at the intersection of the two opposing sides on the second protruding portion 142. The portion 146 abuts against the chain piece 20 of the chain 2 so as to stabilize the chain 2 on the chain plate 1. Due to the reduced width of the first protruding portion 122, it only contacts the roller 22 of the chain 2 when it extends into the link space of the chain 2. However, the inclined surface 144 is the first protruding portion 122 and the corresponding first root portion. The intersection portion 146 formed by the 120 intersections will protrude into the same link space with this first protruding portion 122 and abut against the chain piece 20 of the chain 2. Therefore, although the first protruding portion 122 is only in contact with the roller 20 of the chain 2, the inclined surface 144 and the intersection portion 146 extending between the first protruding portion 122 and the first root portion 120 can also stabilize the chain 2 on the chain plate 1. on.

In the above specific embodiment, the first sprocket 12 and the second sprocket 14 are arranged alternately with each other. However, in practice, the first and second sprockets 12 and 14 may be arranged in other ways after reducing the width. For example, One or more first sprocket elements 12 are arranged between the two second sprocket elements 14. Taking FIG. 5 as an example, the wider link space in the chain 2 can accommodate the first protruding portion 122 and the second protruding portion 142, and the narrower link space can only accommodate the first protruding portion 122. Therefore, An odd number of first sprocket teeth 12 may be disposed between two second sprocket teeth 14 of the sprocket 1, and is not limited to one first sprocket 12. For example, three first sprocket elements 12 may be disposed between the two second sprocket elements 14 to further reduce the overall weight of the sprocket 1. In addition, if the sizes of the links of the chain are the same, the number of the first sprocket 12 provided between the two second sprocket 14 may not be limited to an odd number, and the two second sprocket 14 may be arranged adjacent to each other. The number of the first sprocket 12 provided between the two second sprockets 14 can be arbitrarily arranged without affecting the structural strength according to the needs of the user or the designer. Please note that the intersection portion 146 of the previous embodiment is formed by the inclined surfaces 144 extending from two adjacent second protruding portions 142. However, a plurality of first sprockets are provided between the two second sprockets 14. Under the condition of 14, an inclined surface having the same shape and function as the inclined surface 144 is also formed between the two first protruding portions 122. This inclined surface may intersect with the other inclined surface or the inclined surface 144 to form the intersection portion 146.

To sum up, the sprocket of the present invention also includes the sprocket after reducing the width, which can reduce the overall weight of the sprocket, and the reduced width of the sprocket assists to stabilize the sprocket by the intersection formed by the inclined plane, so the reduction in the prior art can be improved The problem of chain instability caused by the tooth width. In addition, the normal-width sprocket also forms an intersection with the chain piece of the chain. The area of the intersection abutting the chain piece is smaller than that of the prior-art sprocket, so that the side between the chain plate and the chain The friction force is reduced, so the rider can step on the bicycle more easily.

The above-mentioned lateral friction force between the chain plate and the chain is not helpful for the ride of the bicycle, and will only increase the resistance of the rider when he steps on it, which will cause the rider to spend more energy. However, it is not only that the side frictional force will cause the rider to spend more effort. When the first protrusion and the second protrusion are separated from the link space, due to the The direction of movement will be different from the direction of travel of the chain link, so the first protruding portion and the second protruding portion will also generate friction between the rollers of the chain and increase resistance.

Please refer to FIG. 6, which is a schematic diagram of a part of the sprocket 3 according to another embodiment of the present invention. Please note that the overall structure of the sprocket 3 in this embodiment is the same as the sprocket 1 in FIG. 1, that is, the sprocket 3 also has a disc-shaped body 30 and a plurality of staggered arrangements distributed on the periphery 300 of the body 30. A plurality of first sprocket teeth 32 and a plurality of second sprocket teeth 34. As shown in FIG. 6, this specific embodiment is different from the previous specific embodiment in that the first protruding portion 322 of the first sprocket 32 of this specific embodiment moves from the first root portion 320 toward the axis away from the axis of the body 30. The direction extends biased, so that the top of the first protruding portion 322 is biased toward one of the adjacent second protruding portions 342. At the same time, the height of the first protruding portion 322 is lower than that of the second protruding portion 342. In addition to the above-mentioned differences, the types and functions of other components of this specific embodiment are substantially the same as those of the corresponding components of the previous specific embodiment, so they are not repeated here.

Please refer to FIG. 7, which is a schematic diagram of a part of the chain plate 3 and the chain 2 of FIG. 6. As shown in FIG. 7, in a bicycle, the rider steps on the pedal to drive the chain wheel 3 to rotate in the direction D1, and will cause the chain 2 to move, thereby causing the chain 2 to roll away from the chain wheel 3 Child 22 moves in the direction of D2. In this embodiment, the height of the first protruding portion 322 is lower than that of the second protruding portion 342, so the roller 22 in the chain 2 that is in contact with the first protruding portion 322 can leave the first protruding portion earlier. 322, reducing the friction between the two. In addition, the first protruding portion 322 contacts and pushes the roller 22 with one side with a steeper slope, and the other side of the first protruding portion 322 has a gentler slope and a longer distance. In other words, in this specific embodiment, Compared with the first protrusion 122 of the foregoing specific embodiment, the first protrusion 322 has a structure in which the center of gravity of the first protrusion 322 is biased toward the roller 22 that it contacts, and the area in contact with the roller 22 is larger. less. At the point where the chain 2 is disengaged, the top of the first protruding portion 322 will further push the roller 22 and leave the roller 22 more quickly, so that when the rider steps on the pedal, the resistance caused by the friction force can be further reduced.

In summary, the sprocket of the present invention can achieve the effect of reducing the overall weight by reducing the width of some of the sprocket teeth. At the same time, the sprockets at the reduced width are also designed with bevels and intersections to help stabilize the chain on the sprocket. In addition, the width-reduced sprocket can be further designed to have a lower height and the center of gravity is more biased toward the rollers. In addition to the aforementioned functions, it can further reduce the friction between the rollers and the sprocket of the chain and reduce the bicycle. The resistance of the rider when stepping on the pedal is more conducive to the performance of the rider during sports or competition.

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

[this invention]

1, 3‧‧‧ chain plate

10, 30‧‧‧ Ontology

12, 32‧‧‧ the first sprocket

14, 34‧‧‧Second sprocket

100, 300‧‧‧periphery

120, 320‧‧‧ first root

122, 322‧‧‧ first protrusion

140, 340‧‧‧ second root

142, 342‧‧‧ second protrusion

144, 344‧‧‧ bevel

146, 346‧‧‧Intersection

2‧‧‧chain

20‧‧‧ Chain

22‧‧‧Roller

D1‧‧‧ direction

D2‧‧‧ direction

FIG. 1 is a schematic diagram of a sprocket according to a specific embodiment of the present invention. FIG. 2 is a partial schematic view of the sprocket of FIG. 1. FIG. 3 is a partial schematic view of the chainring of FIG. 1 from another perspective. FIG. 4 is a partial schematic view of a side surface of the sprocket of FIG. 2. FIG. 5 is a partial schematic view of the chain disc and the chain chain of FIG. 2. FIG. 6 is a partial schematic view of a sprocket according to another embodiment of the present invention. FIG. 7 is a partial schematic view of the chain disc of FIG. 6 being chained with the chain.

Claims (8)

A chain disc is used for linking with a chain. The chain disc comprises: a body having an axial center and a peripheral edge far from the axial center; a plurality of first sprockets distributed on the peripheral edge of the body for Separably engaged in the chain link space of the chain, the first sprocket teeth respectively include a first root portion and a first protruding portion, the first root portion is disposed at the peripheral edge, and the first protruding portion Extending from the first root portion in a direction away from the axis, the cross-section of the first protruding portion is smaller than the cross-section of the first root portion; and a plurality of second sprockets are distributed on the periphery of the body, such that At least one of the first elements is distributed between two of the second elements, and the second elements are used to be detachably engaged in the link space of the chain. The second elements are respectively It includes a second root portion and a second protruding portion. The second root portion is disposed on the peripheral edge. The second protruding portion extends from the second root portion in a direction away from the shaft center. The cross section is smaller than the cross section of the second root portion, and the width of the cross section of the second protrusion is At the width of the cross section of the first protruding portion, the second protruding portion has at least one inclined surface, and the at least one inclined surface extends to the first protruding portion and the first root portion adjacent to the second protruding portion. between. The chain wheel according to claim 1, wherein the second protruding portion includes two inclined planes, and an intersection is formed between the inclined planes. When the chain disc is linked with the chain, the intersection is in the link space. The inner piece abuts against the chain. The chainring according to claim 1, wherein the at least one inclined surface extended by one of the second protrusions is between the adjacent first protrusion and the first root and the Wait for the at least one oblique intersection extending from the other of the second protrusions to form an intersection. The reel according to claim 3, wherein when the reel is linked with the chain, the first protruding portion and the corresponding intersection portion are located in the same link space, and the intersection portion is in the chain The chain pieces abut against the chain in the joint space. A chain disc is used for linking with a chain. The chain disc comprises: a body having an axial center and a peripheral edge far from the axial center; a plurality of first sprockets distributed on the peripheral edge of the body for The chain is detachably engaged, and the first elements include a first root portion and a first protruding portion, respectively. The first root portion is disposed on the peripheral edge, and the first protruding portion faces from the first root portion toward the first root portion. A direction extending away from the axis is biased, a cross section of the first protruding portion is smaller than a cross section of the first root portion; and a plurality of second sprockets are distributed on the periphery of the body, and the second sprockets At least one of the first elements is distributed between the two, and the second elements are used to be detachably engaged in the link space of the chain. The second elements each include a second element. A root portion and a second protruding portion, the second root portion is disposed at the peripheral edge, the second protruding portion extends from the second root portion in a direction away from the axis, and a cross section of the second protruding portion is smaller than the A cross section of the second root portion, and a width of the cross section of the second protruding portion is larger than the The width of the cross section of the protruding portion, the height of the second protruding portion extending from the second root portion is greater than the height of the first protruding portion extending from the first root portion, and the second protruding portion has at least one An inclined surface, the at least one inclined surface extending between the first protruding portion and the first root portion adjacent to the second protruding portion. The chain disc as described in claim 5, wherein the second protruding portion includes two inclined planes, and an intersection portion is formed between the inclined planes. When the chain disc is linked with the chain, the intersection portion is in the link space The inner piece abuts against the chain. The chainring as claimed in claim 5, wherein the at least one inclined surface extended by one of the second protrusions is between the adjacent first protrusion and the first root and the Wait for the at least one oblique intersection extending from the other of the second protrusions to form an intersection. The reel according to claim 7, wherein when the reel is linked with the chain, the first protruding portion and the corresponding intersection portion are located in the same link space, and the intersection portion is in the chain The chain pieces abut against the chain in the joint space.