TWM559283U - Chain tensioner - Google Patents

Abstract

A tensioning device for a chain, which is suitable for being assembled on a vehicle body and disposed beside the chain, the tensioning device comprising a joint portion for assembling with the vehicle body, a metal joint and an elastic joint connecting the joint portion Segment, and a guide. The elastic constant of the elastic section is k=0.01~1000 N/mm. The guide member can be pushed against the elastic force of the elastic segment to maintain the chain to a certain degree of tension. Since the elastic section is made of a resilient metal sheet body, it has an appropriate range of elastic constants, so that it can generate appropriate deformation and elastic force, and pushes the guide member against the chain to maintain a certain degree of tension of the chain. , reduce the chain problem. The novel overall structure is simple, the manufacturing cost is low, the design is simple and light, and the light weight requirement of the bicycle is met, and the installation is convenient.

Description

Chain tensioning device

The present invention relates to a tensioning device, and more particularly to a tensioning device for a chain.

It is known that the chain of the bicycle will cause the chain to elongate due to the wear of the running process after a period of use. When the chain is stretched and loosened, the degree of meshing with the sprocket will be affected, resulting in the chain and the sprocket not meshing smoothly or even being produced. Chain phenomenon, so some bicycles will be additionally equipped with a chain tensioner to ensure that the chain can be properly tensioned to maintain a stable degree of engagement between the chain and the sprocket. For example, in the patent of Taiwan Patent No. I590980, a bicycle chain tensioning device is provided. However, the structure of the tensioning device of the patent is too complicated, resulting in a heavier overall weight, which cannot meet the requirements of light weight, and which has many assembly components, high cost, and inconvenience in installation, and therefore needs to be improved. In addition, a bicycle chain tensioner provided by Taiwan Patent No. M369912 provides that the tensioned component itself is inelastic and needs to be adjusted by pivotal assembly to provide tension, whenever the elongation of the chain changes. It takes a time-consuming adjustment, which is very inconvenient, and the component volume accounts for a certain proportion and cannot be effectively streamlined.

Accordingly, it is an object of the present invention to provide a tensioning device for a chain that overcomes at least one of the disadvantages of the prior art.

Therefore, the tensioning device of the novel chain is suitable for being assembled on a vehicle body and is suitable for being disposed beside the chain, the tensioning device of the chain comprises a coupling section suitable for assembling with the vehicle body, and a metal system. The elastic section, as well as a guide. The elastic section is connected to the joint section, and the elastic section has an elastic constant of k=0.01~1000 N/mm. The guiding member is located at an end of the elastic section away from the coupling section, and the guiding member can be pushed by the elastic force of the elastic section to maintain the chain to a certain degree of tension.

The effect of the novel is that since the elastic section is made of a resilient metal sheet body, it has an appropriate range of elastic constants, can generate appropriate deformation and elastic force, and pushes the guide member against the chain to maintain the chain. It must be tensioned to prevent the chain from swaying during operation due to elongation, resulting in unsatisfactory meshing. This can reduce the problem of chain loss and improve smooth running. The novel overall structure is simple, the manufacturing cost is low, the design is simple and light, and the light weight requirement of the bicycle is met, and the installation is convenient.

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 and 2, a first embodiment of the tensioning device of the novel chain 1 is suitable for assembly on a vehicle body 10 and is adapted to be disposed beside the chain 1, the chain 1 comprising a plurality of inner links a sheet 11, a plurality of outer chain pieces 12, and a plurality of chain rolls 13 between the inner chain pieces 11, the tensioning device of the chain 1 comprises a joint section 2, an elastic section 3, a fixing member 4, and a Guide member 5, and an assembly section 6.

The joint section 2 is made of a metal material and is substantially L-shaped, and includes a suspension arm portion 21 adapted to be assembled with the vehicle body 10, and a bottom portion extending from the bottom end of the suspension arm portion 21 toward the lower side of the chain 1. The arm portion 22 is extended. The suspension arm portion 21 is substantially a sheet-like body extending upward and downward, and is fixed to the vehicle body 10 through a bolt 101 and a nut 102.

The elastic section 3 is a sheet-like structure made of metal, and has an elastic constant of k=0.01-1000 N/mm and a Young's modulus of 69-220 MPa, so that it has appropriate elastic force and deformability. The elastic section 3 is substantially in the form of a sheet extending in the front-rear direction, and the width of the elastic section 3 in the left-right direction Y and the length in the front-rear direction X are larger than the thickness of the elastic section 3 in the up-and-down direction Z. The elastic section 3 includes an assembly portion 31 that is coupled to the extension arm portion 22 of the joint portion 2, and an engagement portion 32 that is coupled between the assembly portion 31 and the assembly portion 6. The assembly portion 31 has an assembly hole 311 extending from the top surface to the bottom surface. The outer shape of the assembly portion 31 is not limited as long as it can be assembled and fixed with the extension arm portion 22.

The fixing member 4 passes through the assembly hole 311 to lock the assembly portion 31 and the extending arm portion 22.

The guiding member 5 is located at an end of the elastic section 3 away from the coupling section 2 and is located outside the loose side of the chain 1. The guide member 5 of the present embodiment is rotatably mounted on the assembly section 6 through a shaft 50, and includes a central wheel portion 51 and two side wheel portions respectively connected to opposite sides of the center wheel portion 51. 52, and a projection 53 located between the side wheel portions 52 and projecting radially from the periphery of the center wheel portion 51. Each of the side wheel portions 52 has a plurality of weight reducing holes 521, and the weight reducing holes 521 are provided to reduce the weight of the guide member 5, thereby achieving a light weight requirement. In practice, the number of the lightening holes 521 of each side wheel portion 52 may be at least one, and only one side wheel portion 52 may be provided. The projections 53 are adapted to abut the chain rollers 13 of the chain 1.

The assembly section 6 connects the elastic section 3 and the guide 5, and includes two side walls 61 which are arranged on opposite sides of the guide 5 in the left-right direction Y. In practice, the assembly section 6 may also include only one of the side walls 61.

It should be noted that the joint section 2 and the elastic section 3 may be integrally formed metal parts, and the assembly of the two components is not limited. The elastic section 3 and the assembly section 6 can also be integrally formed metal parts. Further, the bonding section 2, the elastic section 3 and the assembly section 6 may be integrally formed metal parts.

When the present invention is used, since the elastic segment 3 is made of a resilient metal sheet body, it has an appropriate range of elastic constant (ie, 0.01 to 1000 N/mm), and is further matched with an appropriate Young's modulus of 69 to 220 MPa. The guide member 5 is located under the chain 1, that is, the outer side of the loose side of the chain 1, so that the elastic force of the elastic portion 3 can push the guide member 5 from bottom to top, that is, The chain 1 is pushed by the outer side of the loose side of the chain 1 to the inner side, so that the chain 1 maintains a certain degree of tension, maintaining a stable meshing degree between the chain 1 and the sprocket, and it is safer to ride, and the chain can be reduced. problem. Moreover, the novel overall structure is simple, the manufacturing cost is low, the design is simple and light, and the light weight requirement of the bicycle is met. The present invention can be mounted on a bicycle by the bolt 101 and the nut 102 or other locking components, and is convenient to install.

Referring to Figures 3 and 4, the second embodiment of the tensioning device of the novel chain 1 is substantially the same as the structure of the first embodiment, except that the assembly portion 31 of the second embodiment has several extensions. The assembly holes 311 are arranged at intervals in the front-rear direction X. The fixing member 4 can be selectively passed through any one of the assembly holes 311 to lock the assembly portion 31 with the extension arm portion 22. By installing the assembly holes 311, when the present invention is mounted on the vehicle body 10, it can be used to adjust the position of the guide member 5 against the chain 1, or to set the degree of tightness of the chain 1. In the implementation, the assembly portion 31 may have only one assembly hole 311, and the assembly hole 311 may be an elongated hole extending in the front-rear direction X, or the assembly hole 311 may be disposed on the extension arm portion. Therefore, the position of the guide member 5 against the chain 1 can be adjusted by locking the fixing member 4 at an appropriate position of the assembly hole 311. Therefore, in the present invention, the number of the assembly holes 311 is at least one.

The guide 5 of the present embodiment has a plurality of equally angularly spaced and radially projecting teeth 54 for engaging the chain 1. This second embodiment employs differently shaped guides 5 to press against the chain 1, providing an alternative to a lightweight tensioning device.

Referring to FIG. 5, a third embodiment of the tensioning device of the novel chain 1 is substantially the same as the structure of the second embodiment, except that the position of the guiding member 5 of the third embodiment is disposed on the chain 1. Within the range enclosed by the circle, and against the inner side of the loose side of the chain, the elastic force of the elastic section 3 will push the guide member 5 from the top to the bottom, that is, from the inner side of the loose side of the chain 1 to the outer side. The direction is pushed against the chain 1 to maintain the chain 1 at a certain degree of tension.

The different structural design of the third embodiment can be installed at different positions of the vehicle body 10. Therefore, the novel design can cooperate with different styles of the structure of the vehicle body 10 to improve the application flexibility, and the guide wheel 5 is located within the range enclosed by the chain 1 to avoid collision or kicking by foreign objects.

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.

10‧‧‧Car body
101‧‧‧ bolt
102‧‧‧ nuts
1‧‧‧Chain
11‧‧‧Internal link
12‧‧‧Outer link
13‧‧‧Chain Rolling
2‧‧‧Combined section
21‧‧‧ hanging arm
22‧‧‧Extended arm
3‧‧‧Flexible section
31‧‧‧ Assembly Department
311‧‧‧Assembled holes
32‧‧‧Connecting Department
4‧‧‧Fixed parts
5‧‧‧ Guides
50‧‧‧Connected shaft
51‧‧‧Central Wheels
52‧‧‧ side wheel
521‧‧‧Lightening hole
53‧‧‧Protruding
54‧‧‧ teeth
6‧‧‧ Assembly section
61‧‧‧ side wall
X‧‧‧ direction
Y‧‧‧ direction
Z‧‧‧Up and down direction

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: Figure 1 is an exploded perspective view showing a first embodiment of the tensioning device of the novel chain and a body Figure 2 is a side view showing the assembly relationship between the first embodiment and the vehicle body and the chain; Figure 3 is an exploded perspective view showing a second embodiment of the tensioning device of the novel chain Figure 4 is a side view showing the assembly relationship between the second embodiment and the vehicle body and the chain; and Figure 5 is a side view showing a tensioning device of the novel chain The assembly relationship between the third embodiment and the vehicle body and the chain.

Claims (15)

A tensioning device for a chain, which is suitable for being assembled on a vehicle body and adapted to be disposed beside the chain, the tensioning device of the chain comprises: a coupling section adapted to be assembled with the vehicle body; a metal elastic a section connecting the joint section, the elastic section has an elastic constant of k=0.01~1000 N/mm; and a guide member located at an end of the elastic section away from the joint section, the guide member being capable of receiving the elastic force of the elastic section The chain is maintained to maintain a certain degree of tension. A tensioning device for a chain according to claim 1, wherein the elastic section includes an assembly for assembly with the coupling section. A tensioning device for a chain according to claim 2, wherein the assembly has at least one assembly hole. The tensioning device of the chain according to claim 1, wherein the elastic segment is in the form of a sheet, and the width of the elastic segment in the left-right direction and the length in the front-rear direction are greater than the thickness of the elastic segment in the up-and-down direction. The tensioning device of the chain of claim 1, wherein the bonding section is made of a metal material. A tensioning device for a chain according to claim 2, wherein the coupling portion includes a suspension arm portion assembled with the vehicle body, and an extension arm coupled to one end of the suspension arm portion and assembled with the elastic portion unit. A tensioning device for a chain according to claim 6, further comprising a fixing member for fixing the extending arm portion and the assembling portion of the elastic portion. A tensioning device for a chain according to claim 1, further comprising an assembly section connected between the elastic section and the guide, the assembly section including at least one side wall on a side of the guide. A tensioning device for a chain according to claim 1, wherein the guide member is urged by the elastic force of the elastic portion to urge the chain from the outer side of the loose side of the chain to the inner side. A tensioning device for a chain according to claim 1, wherein the guide member is responsive to the elastic force of the elastic portion to urge the chain from the inner side of the loose side of the chain to the outer side. A tensioning device for a chain according to claim 1, wherein the guide member comprises a central wheel portion, and a projection projecting radially from a periphery of the central wheel portion and adapted to urge the chain. The tensioning device of the chain of claim 11, the chain comprising a plurality of chain rollers, wherein the projections are adapted to resist the chain rollers. A tensioning device for a chain according to claim 11, wherein the guide further comprises at least one side wheel portion connected to a side of the center wheel portion. The tensioning device of the chain of claim 13, wherein the at least one side wheel portion has at least one lightening hole. The tensioning device of the chain of claim 1, wherein the elastic section has a Young's modulus of 69 to 220 MPa.