TW201800307A - Pulley assembly for bicycle - Google Patents

Abstract

A pulley assembly for bicycle includes an upper pulley, a lower pulley, a connecting element, and a chain. The upper pulley has a plurality of first teeth on a periphery thereof. The lower pulley has a plurality of second teeth on a periphery thereof. The connecting element connects the upper pulley and the lower pulley therebetween so that the upper pulley and the lower pulley are rotatably disposed on the connecting element respectively. The chain is engaged with the first teeth and the second teeth to be connected to a derailleur system. When the chain is moved toward a direction, the upper pulley and the lower pulley are rotated along opposite directions. The number of the first teeth is equal to the number of the second teeth, and each of the number of the first teeth and the number of the second teeth is equal to or larger than 16.

Description

Bicycle guide wheel set

The present invention relates to a steering wheel set for a bicycle shifting system.

Press, the bicycle guide wheel is linked by a chain and a shifting system to provide chain guidance during shifting. The conventional bicycle guide wheel generally has 11 teeth, even less than 11 teeth, and the chain rotation angle (the angle of any two teeth connecting the adjacent three teeth) is more than 35 degrees, the power inertia is greatly degraded, and the chain meshes with the teeth. The number of the chain is small, and the chain is prone to occur, but the circumferential angle of the chain and the guide wheel is large, the friction is large, and the energy consumption is further increased.

Therefore, how to improve energy transfer efficiency and reduce impairment has become a very important issue.

The main object of the present invention is to provide a bicycle guide wheel set which can reduce the angle change of the chain rotation, so that the power inertia loss is small, and the transmission efficiency is better.

To achieve the above object, the present invention provides a bicycle guide wheel set comprising an upper guide wheel, a lower guide wheel, a connecting member and a chain.

The outer rim of the upper guide wheel has a plurality of first teeth, and the outer rim of the lower guide wheel has a plurality of second teeth, and the connecting member is connected between the upper guide wheel and the lower guide wheel, so that the upper guide wheel And the lower guide wheel is rotatably disposed on the connecting member, the chain chain is disposed on the first and second teeth of the upper and lower guide wheels and is connected to a shifting system, wherein the chain is located The portion between the upper guide wheel and the lower guide wheel coincides with the inner tangent of the upper guide wheel and the lower guide wheel. When the chain moves in one direction, the upper guide wheel and the lower guide wheel are oppositely driven. The direction of rotation is equal to the number of the second teeth, and the number of the first teeth and the number of the second teeth are respectively greater than 16.

Thereby, the bicycle guide wheel set of the invention can reduce the chain rotation angle, reduce energy loss and improve transmission efficiency.

The following is a description of the possible embodiments of the present invention, and is not intended to limit the scope of the invention as claimed.

1 to 4, the present invention provides a bicycle guide wheel set 10 comprising an upper guide wheel 11, a lower guide wheel 12, a connecting member 13 and a chain 14.

The outer rim of the upper guide wheel 11 has a plurality of first teeth 111; the outer rim of the lower guide wheel 12 has a plurality of second teeth 121; the connecting member 13 is connected to the upper guide wheel 11 and the lower guide wheel 12 The upper guide wheel 11 and the lower guide wheel 12 are respectively rotatably disposed on the connecting member 13; the chain 14 is chained to the first tooth 111 and the first tooth 111 and the lower guide wheel 12 The two teeth 121 are connected to a shifting system 20, and the portion of the chain 14 between the upper guide wheel 11 and the lower guide wheel 12 coincides with the inner tangent of the upper guide wheel 11 and the lower guide wheel 12, when When the chain 14 moves in a direction, the upper guide wheel 11 and the lower guide wheel 12 are rotated in opposite directions; wherein the number of the first teeth 111 is equal to the number of the second teeth 121, and the first The number of teeth 111 and the number of the second teeth 121 are respectively greater than 16.

Preferably, the number of the first teeth 111 and the number of the second teeth 121 are respectively less than 20. The center line of the upper guide wheel 11 and the lower guide wheel 12 defines a connecting line L1, and the connecting line L1 and the upper guiding line The acute angle θ1 of the tangential line L2 of the wheel 11 and the lower guide wheel 12 is between 40 and 60 degrees, and the upper guide wheel 11 is connected to any of the first adjacent teeth 111 of any three adjacent first teeth 111. The angles θ2 of the lines L3 and L4 are less than 30 degrees.

In this embodiment, the number of the first teeth 111 and the number of the second teeth 121 are both 16, θ1 is about 50 degrees, and θ2 is about 20 degrees, which is the same as the number of teeth of the upper and lower guide wheels and the number of teeth is less than that on the market. 11, θ1 and θ2 are obviously smaller, that is, the chain 14 has a smaller rotation angle, the power inertia is less damaged, and the central angle of the portion of the guide wheel that is contacted by the chain is smaller, the friction is reduced, and in addition, the number of teeth is small. A large angle causes a situation of disconnection.

In summary, the bicycle guide wheel set provided by the invention has a smaller chain rotation angle, which helps to reduce the loss of power inertia, and reduces friction and avoids chain detachment, which is helpful for improving transmission efficiency. Great progress.

10‧‧‧Bicycle guide wheel set
11‧‧‧Upper guide wheel
111‧‧‧First tooth
12‧‧‧ lower guide wheel
121‧‧‧second tooth
13‧‧‧Connecting parts
14‧‧‧Chain
20‧‧‧Transmission system
L1‧‧‧With heart line
L2‧‧‧ inscribed line
L3‧‧‧ connection
L4‧‧‧ connection θ1‧‧‧ angle θ2‧‧‧ angle

Figure 1 is a perspective view of the present invention. Figure 2 is a perspective exploded view of the present invention. Figure 3 is a front elevational view of the present invention. Figure 4 is a schematic illustration of the use of the invention.

10‧‧‧Bicycle guide wheel set

11‧‧‧Upper guide wheel

111‧‧‧First tooth

12‧‧‧ lower guide wheel

121‧‧‧second tooth

13‧‧‧Connecting parts

14‧‧‧Chain

Claims (5)

A bicycle guide wheel set comprising: an upper guide wheel, the outer ring edge of the upper guide wheel has a plurality of first teeth; a lower guide wheel, the outer ring edge of the lower guide wheel has a plurality of second teeth; a connecting piece, connecting Between the upper guide wheel and the lower guide wheel, the upper guide wheel and the lower guide wheel are respectively rotatably disposed on the connecting member; a chain, the chain is disposed on the upper guide wheel and the lower guide wheel a first tooth and a second tooth are connected to a shifting system, and a portion of the chain between the upper guide wheel and the lower guide wheel coincides with an inner tangent of the upper guide wheel and the lower guide wheel when the chain When moving in a direction, the upper guide wheel and the lower guide wheel are rotated in opposite directions; wherein the number of the first teeth is equal to the number of the second teeth, and the number of the first teeth is different from the second The number of teeth is greater than 16, respectively. The bicycle guide wheel set according to claim 1, wherein the upper guide wheel and the lower guide wheel center line define a connecting line, and the angle between the connecting line and the upper guide wheel and the lower guide inner tangent line At 40 to 60 degrees. The bicycle guide wheel set according to claim 1, wherein the number of the first teeth and the number of the second teeth are respectively less than 20. The bicycle guide wheel set according to claim 1, wherein any one of the first adjacent teeth of the three upper adjacent guide wheels has an angle of less than 30 degrees. The bicycle guide wheel set according to claim 1, wherein the number of the first teeth and the number of the second teeth are 16, respectively.