TWM514431U - Bicycle transmission device and bicycle sprocket - Google Patents

Description

Bicycle transmission and bicycle sprocket

The present invention relates to a transmission device and a sprocket, and more particularly to a bicycle transmission device and a bicycle sprocket.

In recent years, people have become more and more concerned about outdoor leisure activities and sports health, so more and more people like to ride bicycles, whether it is a daily travel tool or holiday leisure sports, it is very convenient. As the bicycle runs, there will be friction between the sprocket and the chain. Generally, the material of the sprocket and the chain roller in the chain are mainly metal. Although the metal material is resistant to friction, the metal material is heavy and generates noise, which is not good for bicycle. The need for lightweighting. In addition, there is a bicycle designed with a belt and a pulley. Although this transmission design can reduce noise, the cost of the belt is high, and the transmission efficiency is poor, so the use is not satisfactory.

In addition, in the patent No. 092122184, it is disclosed that the peripheral surface of the tooth has a sound-insulating portion made of an elastic composite material, but since the sound-insulating portions of the patent are only located on the peripheral surface of the tooth, the front surface and the rear of the tooth are The surface is not provided with a soundproof portion, that is, the front and rear surfaces of the latch are still made of metal, and collide with the metal chain and chain roller of the chain, and still have a large collision noise. The case has a limited effect of reducing collision noise.

Accordingly, it is an object of the present invention to provide a transmission for a bicycle that contributes to weight reduction, noise reduction, and cost reduction, and a bicycle sprocket.

Thus, the transmission of the bicycle of the present invention comprises: a sprocket, and a chain meshing with the sprocket. The sprocket includes a wheel body including an outer periphery having a plurality of teeth. The chain includes a plurality of left-and-right-connected series-connecting units, each of the series-connecting units includes two spaced-apart first links, two spaced-apart second links that are partially overlapped with the first link, At least one chain for connecting the first chain and the second chain, and at least one chain roller surrounding the chain shaft and of plastic material, the teeth of the sprocket contacting the The chain is rolled, and the parts of the teeth that are in contact with the chain roller are made of plastic material.

The sprocket of the bicycle of the present invention comprises: a coupling member, and a wheel body fixedly coupled with the coupling member. The joint member is made of metal and includes a fixing hole. The wheel body includes an inner circumference and an outer circumference, and at least one wheel surface extending from the inner circumference toward the outer circumference. The outer circumference is provided with a plurality of teeth, and the teeth have a circumference. An engaging portion on the edge, and at least one side portion on the wheel surface, the engaging portion and the side portion are made of a plastic material.

The utility model has the advantages that the chain roller and at least part of the teeth are made of plastic material, thereby achieving the effects of light weight, noise reduction and cost reduction.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 1 to 4, a first embodiment of the transmission of the bicycle of the present invention comprises: a sprocket 1, a fixing member 2, and a chain 3.

The sprocket 1 includes a wheel body 11 that surrounds a central axis not shown, and a plurality of coupling members 4 that are equally angularly coupled into the wheel body 11. Each of the bonding members 4 is made of a metal material and includes a fixing hole 41 and two spaced coupling holes 42. The wheel body 11 is made of a plastic material, and is mainly a plastic material containing nylon and wear-resistant. Specifically, the main component of the wheel body 11 is nylon, and further comprises glass fiber and/or Teflon, and the glass fiber has The high hardness can improve the wear resistance of the wheel body 11. The Teflon has lubricity, and a film can be formed on the surface of the wheel body 11 to prevent dirt, increase lubrication and extend the life of the component. The wheel body 11 has an annular structure and includes a base portion 111 surrounding the coupling member 4, and a plurality of extending portions 112 connecting the base portions 111 and respectively extending into the coupling holes 42 of the coupling member 4. . The base portion 111 has an annular inner periphery 113, an outer peripheral edge 114 opposite the inner peripheral edge 113, and two rims 118 that are spaced apart from each other and extend from the inner peripheral edge 113 toward the outer peripheral edge 114. The outer periphery 114 has a plurality of teeth 115 disposed at equal angular intervals. The teeth 115 each have an engagement portion 116 on the outer periphery 114 and two side portions 119 on the tread 118, respectively. Further, the base portion 111 further has a plurality of mounting holes 117 extending through the fixing holes 41, and the mounting holes 117 and the fixing holes 41 communicate with each other.

The fixing member 2 of the embodiment is a crank, and the fixing member 2 includes a plurality of mounting portions 21 combined with the sprocket 1 , and the mounting portions 21 are respectively located corresponding to the fixing holes 41 of the coupling member 4 . Each mounting portion 21 can be assembled and coupled to the corresponding fixing hole 41 through the mounting hole 117 through a connecting member 22 such as a rivet. In the implementation of the present invention, the structure of the sprocket 1 can be changed as needed, and when the fixing member 2 is assembled according to the sprocket 1 of different structure, the fixing member 2 can also be other transmission elements.

The chain 3 is meshed with the sprocket 1 and includes a plurality of adjacently arranged and connected splicing units 31. Each of the splicing units 31 includes: two spaced apart first links 32, two spaced opposites and respectively a second chain 33 partially overlapping the first chain piece 32 and located between the first chain pieces 32, and two chain shafts 34 for connecting the first chain piece 32 and the second chain piece 33 in series, Two bushings 35 respectively surrounding the chain shaft 34 and closely engaging with the second chain piece 33, and two surrounding the chain shaft 34 and the bushing 35 respectively and located at the second chain piece 33 The chain between the rolls 36. It should be noted that, in this embodiment, the first chain piece 32 and the second chain piece 33 which are assembled by overlapping the inside and the outside are described. However, in the implementation, the chain piece of the chain 3 may also adopt a so-called integrated half-eye chain form. Since this change is a well-known skill, it is no longer a rumor.

One of the chain shafts 34 is connected in series with the second chain piece 33 of the same serial connection unit 31 and the first chain piece 32, and the other of the chain shafts 34 is used for serially connecting the serial connection units 31 thereof. The second chain piece 33 and the first chain piece 32 of another adjacent series unit 31 are fixed to the first chain piece 32. Each of the chain rollers 36 of the present embodiment is made of a plastic material, mainly a plastic material containing nylon and wear-resistant, and further includes glass fiber and/or Teflon to improve the wear resistance and lubricity of the chain roller 36. With component life.

When the sprocket 1 of the embodiment is manufactured, the plastic material of the wheel body 11 can be injection molded and covered with the joint member 4, and the joint member 4 can be embedded in the wheel body 11. The extension portion 112 of the wheel body 11 extends into the coupling hole 42 of the coupling member 4 to help the wheel body 11 and the coupling member 4 to be firmly coupled. The material of the wheel body 11 is not filled in the fixing hole 41 to retain the fixing hole 41 for the fixing member 2 to be combined.

Since the engaging portion 116 of the tooth 115 contacts the chain roller 36, the engaging portion 116 is made of a plastic material, so that the tooth 115 and the chain roller 36 are plastic-to-plastic contact and friction. This can reduce the collision noise between the two, and the meshing between the two is the same material, and the wear of both sides is equivalent, which can prolong the service life of the components and the meshing transmission efficiency. In addition, the plastic material is lightweight and relatively inexpensive compared to known belt designs, helping to achieve weight reduction and cost reduction. It should be noted that, although the wheel body 11 is entirely made of a plastic material in the embodiment, as long as the part of the tooth 11 on the outer peripheral edge 14 that is in contact with the chain roller 36 is a plastic material, It can achieve the desired effect of this novel. In addition, the side portion 119 of each of the teeth 115 contacts the first link 32 and the second link 33 of the chain 3, and a collision occurs. When at least one of the side portions 119 is made of a plastic material, It can have obvious noise reduction effect compared with the prior art; further, when the side portions 119 are all made of plastic material, there is better noise reduction effect.

Moreover, the pitch d of the second link 33 of each of the series connection units 31 of the present invention is preferably 7 mm to 11 mm. The spacing d of the present invention can be designed to be larger than the pitch of a typical bicycle chain (usually about 3 mm), so that the chain roller 36 can be lengthened in the axial direction by the increase of the spacing d. Moreover, since the teeth 115 of the sprocket 1 respectively extend into the space between the adjacent chain rollers 36, the length of the chain roller 36 is increased, which helps to improve the chain roller 36 and the The contact area between the teeth 115 is such that the stress between the chain roller 36 and the sprocket 1 can be dispersed by increasing the contact area, so that the friction loss between the chain roller 36 and the sprocket 1 can be reduced. The aforementioned contact area of this embodiment is about three times the contact area of the conventional design. Preferably, the ratio of the pitch P of the chain 3 to the axial length L of the chain roller 36 is 1.5 to 2.1, that is, 1.5 ≦P/L ≦ 2.1, so the chain roller 36 of the present invention The axial length L occupies a certain proportion of the entire chain 3, which also helps to increase the contact area between the chain roller 36 and the gear teeth 115.

In this embodiment, the sprocket and the crank assembly are subjected to fatigue resistance detection by the ISO4210 bicycle standard specification, and the new model not only meets the standard specification (100,000 times of fatigue detection), but also adopts more stringent test conditions (200,000 times). When the fatigue test is performed, the transmission can still pass the test, and the new type has excellent fatigue resistance detection performance.

Referring to Fig. 5, a second embodiment of the transmission of the bicycle of the present invention is substantially the same as that of the first embodiment, but the chain 3 of the present embodiment omits the bushing 35 (Fig. 4). Each of the second links 33 of the present embodiment includes two end portions 331 spaced apart from each other and having a perforation 330, and two protruding rings 332 protruding integrally from the end portion 331 toward the other second link 33. The collars 332 surround the chain shaft 34, respectively. Each of the chain rollers 36 includes a first surrounding portion 361 surrounding the chain shaft 34 and interposed between the protruding rings 332 of the second chain piece 33, and two axially opposite ones respectively connecting the first surrounding portion 361 A second surrounding portion 362 on both sides. The aperture h2 of the second surrounding portion 362 is greater than the aperture h1 of the first surrounding portion 361, and the second surrounding portion 362 is fitted around the protruding ring 332. In the present embodiment, by providing the protruding ring 332 and cooperating with the structure of the chain roller 36, the bushing of the first embodiment can be omitted, thereby reducing the number of components of the chain 3. In the same embodiment, the chain roller 36 and the portion of the gear tooth 115 (FIG. 2) contacting the chain roller 36 are made of a plastic material, thereby achieving weight reduction, noise reduction, and cost reduction.

Referring to Figures 6 and 7, a bicycle sprocket 1 according to a third embodiment of the present invention includes: an annular coupling member 4 surrounding a central axis not shown, and a cover member coupled to the coupling member 4 a peripheral annular wheel body 11. The joint member 4 is made of a metal material and includes an inner peripheral surface 44 that is annular and defines a fixing hole 41, an outer peripheral surface 43 that surrounds the inner peripheral surface 44, and two front and rear spaces are opposed to each other and from the inner peripheral surface 44 toward The outer peripheral surface 43 extends to join the joint surface 40, and a plurality of equiangularly spaced apart and through the joint holes 42 of the joint surface 40. The inner circumferential surface 44 has a plurality of card points 46 that protrude toward the center of the fixing hole 41 at equal angular intervals. The outer peripheral surface 43 has a plurality of teeth 45 which are disposed at equal angular intervals and project outward.

The wheel body 11 is made of a plastic material, mainly a plastic material containing nylon and wear-resistant, and further comprises glass fiber and/or Teflon. The wheel body 11 includes a base portion 111 that is annular and covers the periphery of the coupling member 4, and a plurality of extending portions 112 that connect the base portions 111 and respectively extend into the coupling holes 42. The base portion 111 has an inner peripheral edge 113 between the inner peripheral surface 44 and the outer peripheral surface 43 , an outer peripheral edge 114 surrounding the inner peripheral edge 113 and the outer peripheral surface 43 , and a circumference defined by the inner peripheral edge 113 A mounting hole 117 that communicates with the fixing hole 41 of the coupling member 4, and a wheel surface 118 that is spaced apart from each other and extends from the inner circumference 113 toward the outer circumference 114. The outer periphery 114 has a plurality of teeth 115 disposed at equal angular intervals. The teeth 115 each have an engagement portion 116 on the outer periphery 114 that engages the chain roller. The gear teeth 115 also have two side portions 119 that are respectively located on the wheel surface 118. The protruding position of the tooth portion 45 of the joint member 4 respectively corresponds to the protruding position of the gear tooth 115, so that the joint stability of the joint member 4 and the wheel body 11 can be increased, and the gear teeth can also be enhanced. 115 tooth structure. It should be noted that the tooth portion 45 is not necessarily required, and the tooth portion 45 may be omitted in the present invention.

The wheel body 11 of the present embodiment is entirely made of a plastic material, wherein the gear teeth 115 are in contact with the chain by the engaging portion 116 thereof, so that the collision noise between the gear teeth 115 and the chain roller of the chain can be reduced. Lightweight and cost-effective. Further, the side surface portion 119 of the gear tooth 115 is also made of a plastic material. Since the side surface portion 119 contacts the chain of the chain, a collision occurs, so that the side surface portion 119 of the plastic can be lowered with the chain piece. Collision noise between them for better mute effect. In addition, in the implementation of the present invention, the base portion 111 of the wheel body 11 can be partially wrapped around the joint member 4, or can be completely wrapped around the joint member 4, and can be improved according to requirements.

When the sprocket 1 of the embodiment is manufactured, the plastic material of the wheel body 11 can be injection molded and covered, and the peripheral portion of the coupling member 4 can be embedded in the wheel body 11 to make the coupling member. The joint surface 40 of the joint member 40 is located between the wheel faces 118, and the annular portion of the joint member 4 adjacent to the inner peripheral surface 44 thereof is not covered by the wheel body 11 to be exposed. Since the fixing hole 41 of the coupling member 4 is used for a fixing member (not shown), the fixing member (not shown), for example, but not limited to the hub shaft of the rear wheel, the card point 46 of the inner circumferential surface 44 is The fixing member is occluded. Because the bonding member 4 is made of a metal material and has high wear resistance, the inner peripheral surface 44 and the fixing member can have a good wear-resisting and biting effect, and can improve the bonding stability. It can withstand the strong torque of the transmission to facilitate the transmission of power and extend the life of components. Therefore, the sprocket 1 is combined with metal and plastic materials to achieve the dual material effect.

Referring to FIG. 8, a bicycle sprocket 1 according to a fourth embodiment of the present invention is substantially the same as the third embodiment, except that the base 111 of the wheel body 11 of the present embodiment is only covered by One side of the joint member 4, i.e., the base portion 111, includes only a tread 118 that extends from the inner peripheral edge 113 toward the outer peripheral edge 114. The tooth 115 of the present embodiment has a side portion 119 on the wheel surface 118. This embodiment can also achieve the effects of weight reduction, collision noise reduction and cost reduction compared with the prior art. Moreover, the engaging portion 116 and the side portion 119 of the embodiment are both made of a plastic material. In addition to the collision noise between the chain roller and the chain roller, the embodiment can also reduce the collision noise with the chain roller. It reduces the collision noise with the chain, so it has a good noise reduction effect.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

1‧‧‧Sprocket
11‧‧‧ Wheel body
111‧‧‧ base
112‧‧‧Extension
113‧‧‧ inner circumference
114‧‧‧ outer periphery
115‧‧‧ teeth
116‧‧‧Meshing Department
117‧‧‧ mounting holes
118‧‧‧French
119‧‧‧ side section
2‧‧‧Fixed parts
21‧‧‧Installation Department
22‧‧‧Connecting parts
3‧‧‧Chain
31‧‧‧Sequence unit
32‧‧‧First chain
33‧‧‧Second chain
330‧‧‧Perforation
331‧‧‧End
332‧‧‧ 突环
34‧‧‧Chain
35‧‧‧ bushing
36‧‧‧Chain Rolling
361‧‧‧The first surrounding department
362‧‧‧Second Surroundings
4‧‧‧Connected parts
40‧‧‧ joint surface
41‧‧‧Fixed holes
42‧‧‧Combination hole
43‧‧‧ outer perimeter
44‧‧‧ inner circumference
45‧‧‧ teeth
46‧‧‧ card points
D‧‧‧ spacing
P‧‧‧ pitch
L‧‧‧ axial length
H1, h2‧‧‧ aperture

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: Figure 1 is a front view of a first embodiment of the transmission of the bicycle of the present invention; A front cross-sectional view of a sprocket according to an embodiment; FIG. 3 is a side cross-sectional view of the sprocket, and is a cross-sectional view taken along line 3-3 of FIG. 2; FIG. 4 is one of the first embodiments. Figure 5 is an incomplete sectional view of a chain of a second embodiment of the transmission of the bicycle of the present invention; Figure 6 is a front elevational view showing a third embodiment of the present invention Figure 7 is a side cross-sectional view of the sprocket of Figure 6; and Figure 8 is an incomplete side cross-sectional view showing a bicycle sprocket of a fourth embodiment of the present invention.

1‧‧‧Sprocket

11‧‧‧ Wheel body

111‧‧‧ base

112‧‧‧Extension

113‧‧‧ inner circumference

114‧‧‧ outer periphery

115‧‧‧ teeth

116‧‧‧Meshing Department

117‧‧‧ mounting holes

118‧‧‧French

119‧‧‧ side section

4‧‧‧Connected parts

41‧‧‧Fixed holes

42‧‧‧Combination hole

Claims (17)

A bicycle transmission includes: a sprocket including a wheel body, the wheel body including an outer circumference, the outer circumference is provided with a plurality of teeth; and a chain engaged with the sprocket and including a plurality of left and right a combined splicing unit, each splicing unit comprising two spaced apart first links, two spaced apart second links respectively partially overlapping the first slats, and at least one for cascading said a chain link of the first chain piece and the second chain piece, and at least one chain roll surrounding the chain axis and being of a plastic material, the gear teeth of the sprocket contacting the chain roller, and the gear teeth The parts in contact with the chain roll are all made of plastic material. The transmission device for a bicycle according to claim 1, wherein a ratio of a pitch of the chain to an axial length of the chain roller is 1.5 to 2.1. The transmission device for a bicycle according to claim 1, wherein the chain roller includes a first surrounding portion surrounding the chain shaft, and at least one aperture connecting the first surrounding portion and having a larger diameter than the first surrounding portion. Second surrounding part. The transmission device for a bicycle according to claim 1, wherein the plastic material of the wheel body and the chain roller comprises nylon. The transmission device for a bicycle according to claim 4, wherein the material of the gear teeth and the chain roller further comprises glass fiber and/or Teflon. The bicycle transmission of claim 1, wherein the sprocket further comprises at least one metal joint, the joint being at least partially coupled to the wheel body. The transmission device for a bicycle according to claim 6, wherein the coupling member comprises a fixing hole, and at least one coupling hole, the wheel body includes a base portion partially or completely wrapped around the coupling member, and at least one connection The base portion extends into the extension of the coupling hole, and the transmission of the bicycle further includes a fixing member coupled to the fixing hole. The bicycle transmission device of claim 7, wherein the wheel body further comprises at least one mounting hole that communicates with the fixing hole of the coupling member. The transmission device for a bicycle according to claim 7 or 8, wherein the coupling member further comprises an outer peripheral surface, the outer peripheral surface being provided with at least one tooth portion. The transmission of the bicycle of claim 9, wherein the tooth portion corresponds to a position of one of the teeth. A sprocket for a bicycle, comprising: a coupling member made of a metal material and comprising a fixing hole; and a wheel body fixedly coupled with the coupling member, the wheel body comprising an opposite inner circumference and an outer circumference, and at least one a tread extending from the inner periphery toward the outer periphery, the outer periphery being provided with a plurality of gear teeth, each of the teeth having an engaging portion on the outer periphery and at least one side portion on the wheel surface The engaging portion and the side portion are made of a plastic material. The sprocket of the bicycle of claim 11, wherein the coupling member further comprises at least one coupling hole, the wheel body comprising at least one extension extending into the coupling hole. The sprocket for a bicycle according to claim 11, wherein the coupling member further includes an inner circumferential surface defining the fixing hole, and an outer circumferential surface surrounding the inner circumferential surface, the outer circumferential surface being provided with at least one tooth portion And the tooth portion corresponds to a position of one of the teeth. The sprocket for a bicycle according to any one of claims 11 to 13, wherein the wheel body further includes at least one mounting hole that communicates with the fixing hole of the coupling member. The sprocket of the bicycle according to claim 13, wherein the inner peripheral surface of the coupling member has at least one click point protruding toward the fixing hole. The sprocket of the bicycle according to claim 11, wherein the wheel body comprises two treads extending from the inner periphery toward the outer periphery, the treads are spaced apart, and the teeth have two respectively located at the The side portion of the wheel surface. The sprocket of the bicycle according to claim 11, wherein the coupling member further includes an inner circumferential surface defining the fixing hole, and an outer circumferential surface surrounding the inner circumferential surface, the wheel body including a cover body The base around the joint has the inner circumference, the outer circumference and the tread, and the inner circumference is interposed between the inner circumferential surface and the outer circumferential surface.