TW393414B - Sprocket shape of bike's derailleur system - Google Patents

Abstract

The invention proposed a novel configuration of multistage sprocket assembly used in a bicycle rear derailleur system which featured to guarantee a smooth chain shifting process form a larger diameter sprocket to a smaller diameter sprocket (hereinafter referred as L and S sprockets). This novel configuration for multistage sprocket assembly is made by having a proper modification on the tip ends of the teeth of larger diameter sprocket; controlling both upshifting and non-upshifting positions; as well as specifying a proper changer's path for the chain to be engaged with a tooth of a desired sprocket; arranging phase angle between L and S sprockets; and removing the interference portion between the chain and both L & S sprockets. While the chain is pulled from L sprocket to S sprocket by guide pulley, the chain shall not be able to move out from L sprocket when it is in non-upshifting position, thus, unexpected unsmooth phenomenon during upshifting can be avoided. On the other hand, the chain shall be able to move out from L sprocket immediately upon its arrival at the upshifting position. As following the rotation of sprocket assembly, the chain pitches sequentially about on the designated upshifting path and engage with S sprocket, and the chain shall be gradually disengaged with L sprocket and pulled onto S sprocket to achieve the purpose of completing smooth upshifting process.

Description

V. Explanation of the invention (I) This creation is the new hibiscus of the multi-stage sprocket of the bicycle rear transmission system. Π = In order to change the chain from a large sprocket to a small one. The small key wheel (down key action) can be properly trimmed under the μ. 'Control large key wheel = set the wheel ::: sprocket to remove the key bar from the large key wheel :; method! = Sprocket, when available = can step out of the large sprocket, the chain :: Down the chain path, and hook up the small chain, and recognize the chain in order: lean away from the large key wheel and enter the small key wheel, and finally reach == key key V. Description of the invention (2) The chain changing action of the bicycle transmission can be summarized Divided into two kinds of upper and lower chain, the design of the conventional bicycle multi-segment sprocket device is mostly aimed at the upper chain action, and the lower chain is rarely considered. The traditional bicycle sprocket device does not have a special design for the lower chain action when the chain is changed. When the rider toggles the shift lever, the chain change occurs immediately. At this time, the chain link will follow the guide chain and the guide wheel. With the large sprocket teeth, the chain link side plate can easily ride over the large sprocket tip β. With the rotation of the sprocket set, the chain deviates from the large = the gear 4 has a large path, and the small sprocket has no specific path and special phase relationship. Setting 2-Under normal circumstances, the chain roller will not immediately enter the small sprocket cogging, but the chain segment will ride on the small sprocket tip (@ — in the small sprocket cogging).鋥 φ, this and ^ clothing Yu Muyin in 瞌 Wr, and the riding span chain link mentioned in the journey is most likely on the second wheel. At this time, because the key bar was suddenly absorbed by the key wheel, the chain was held in a tightly collapsed state, & Twist with the KK chain, for the rider, due to the transmission substrate 5. Description of the invention (3) The reverse sharp spin of the foot suddenly feels the reaction force of the pedal becomes smaller, like stepping on the air, so there will be discomfort, which means that the action of the lower chain is not smooth. [Problems to be solved by this creation] · Whether the shift process of the down button and the _L button is smooth is as important as the rider's comfort when shifting gears. The overall process of the following chain in this creation is to consider how to smoothly "Complete-off-chain action as the goal". This is the origin of the creative idea and the problem that this creative wants to solve. _ α [Technology — Category]-A sprocket set for a stepped bicycle with at least a large sprocket and a small sprocket. This creation is the result of a computer-aided design / manufacturing sprocket set. , So that the chain can be changed to a small 'sprocket' when the chain moves. [Previous technology] In recent years, the design of bicycle sprocket sets has been patented, such as the announcement No. 1137 丨 7 " Bicycle flywheel toothed tooth structure ", No. 1 28371 " Bicycle multi-segment chain Wheel device ", No. 脚踏 " Pedal ^ wheels and flywheels for bicycles including a plurality of such sprockets ": Improvement of the tooth profile of bicycle transmission sprocket No. 16962, ", No. 172976 No. and No. 1 7431 4 V. Description of the Invention (4) 'No.' "Improved Structure of Chains Outside the Chain", No. δ573ι and No. 1 97683 " · For Bicycles, Multi-Segment Sprocket Device ", No. No. 88539, Improved Structure of Variable Speed Bicycle Chain ". The design is basically to make the chain easily detach from the large sprocket to the small sprocket, and set the lower chain path of the chain. The method is to increase the chain position of the chain change path located on the large sprocket to the tip of the tooth and maintain the lower chain path. The chain is in a straight line and changes to the small sprocket, but the impact force is still large when the chain is dropped from the large sprocket to the small sprocket. Even when it comes to the improvement of the tooth shape, such as No. 1 67026, No. 1857, No. 1 97683, they all adopt a fixed tooth shape · Dent > except for the oblique cut surface or the tooth top of the sprocket; it is still ideal first. Volleyball Public Announcement Mao 1 97683 "Multi-segment sprocket device for bicycles", its design for the lower chain is to trim 2 to 3 teeth of the large chain wheel *;

The strip is easy to disengage in the direction of the small sprocket, and a support part is set on the side of the sprocket, top I, and the joint is then brought by the chain guide to the appropriate position of the small sprocket (linear distance from the roller of the top south chain dragon) np-a). The rotation of the sprocket set drives the lower chain action. The patent design does not consider the modification of the non-downlink sprocket teeth on the large sprocket, so the undesired riding span may occur on the lower chain. In addition, it is designed to make the linear distance ρ-a between the link rollers leaving the large sprocket and the link rollers reaching the small sprocket when the chain is lowered. At the beginning of the chain change, although the positions of the chain links of the lower chain are arranged, when the chain change is completed and the top link leaves the large sprocket, the chain in the original lower path will quickly fall into the small chain wheel. The wheel causes an impact. V. Description of the invention (5) [Technical content] In order to avoid the undesired action of the lower chain, the first thing is to modify the tooth profile to distinguish the specific lower chain point and non-low chain point on the large sprocket, to grasp the chain exactly In order to use this as the basis for the tooth arrangement and design of the lower chain position on the large sprocket, instead of randomly changing the chain, "on the other hand, the setting of the non-downward key is intended to be biased. In the case of a large sprocket, if the chain link side plate does not cross and the sprocket tooth tip is released, the lowering action can be delayed (Figure Ping (〇), until the chain reaches the unwinding point before the unloading action (Figure 2 (B)). 、 Regarding the control of the tooth tip of the lower chain point 丨 | rectification, halogen key 3 is defined as 7 key chain links kri ti ca 1 chain ,; Ce ··, 3) This is-the guide wheel pulls the chain to the small chain wheel Determine whether the chain can deviate from the chain link of the large sprocket in the direction of the β β This creation "multi-chain chain of the bicycle rear transmission system, the new configuration of the wheel", the main purpose is to change the chain from a large chain wheel to a small chain wheel ( Down chain action) can be performed smoothly. The other purpose of the creation of the chain is to accurately grasp the positioning of the chain on the large sprocket, the arrangement and design of the tooth shape, and the 'strict tolerance is appropriate'> trimming the teeth of the sprocket is particularly to the teeth of the large key wheel Tips should be properly trimmed to control the creation of large sprockets

Five Descriptions of the Invention (6) Five Descriptions of the Invention (6) Down-link position and non-down-link changeover path, arrange the interference part of the large chain. When the towing chain is not expected to shift down the chain from time to time-you can cross the down chain path specified by the large sprocket, the bar gradually moves away from the large sprocket advance position, and an appropriate chain is designated at the lower chain position. The phase of the sprocket can be removed when the large and small sprocket wheels are removed from the large sprocket when the chain is moved from the large sprocket to the small sprocket. Conversely, when the chain reaches the lower chain position, as the sprocket group rotates, the key _ link leans on and hooks on the small sprocket in order, the sprocket group continues to rotate and links into the small sprocket ', and finally reaches a smooth chain. The purpose of this is to properly trim the sprocket teeth of this creation to control the lower chain position and non-down chain position of the large chain wheel, and make the lower chain position mean that the appropriate chain gradually escapes from the large key wheel and enters the small chain wheel. In addition to the definition of non-downlink points (: dagger, 21) and down-link points (dagger, 22), the purpose of smoothing downlinks is to calculate the position of the links in the path. Figure 4 shows the initial position of the chain link on the large sprocket when the chain action occurs. Based on the key links, 3), consider the link (ce, 3) at the contact point of the sprocket (and, 1). The moment the position of its chain plate is not the down-link point (

Pcrl, 21) The displacement in the Z-axis direction is shown in Figure 5 (a). The non-down key tooth tip is removed (: heart, 41). When the tooth tip is trimmed, the top is only $ degrees (Λ 31). If W, the key links cannot oscillate the large key wheel, which can achieve the purpose of delaying the unwinding. This is a non-unloading point. * "Similarly" if the link (, ce, 3) is at the contact point of the sprocket (乂, 丨) the moment

E on page 13 states (7) the position of the dagger, and the displacement of the lower chain point (4, 22) in the Z-axis direction is as shown in Figure 5 (b): the non-downlink tooth tip is removed, 4 2), when the tooth tip is trimmed When the top of the back tooth is only .degree (/ ·, 32), 'If // 2 + 2 + is centered, then the chain link will swing out of the large chain, and the purpose of the lower chain is the lower chain point. I exemption-the chain in the wide down-chain path quickly falls into the impact force of the small sprocket on the small sprocket. 'This creation's decision on the down-chain path, the link in the down-chain path is determined by the offline key of 27. Relationship position. _ •---* — ~ · *? The gap between the inner link and the outer link makes the chain yaw under the guide key guide wheel, using it-like characteristics * After computer calculation, you can decide a chain change The number of links in the path is g, i, and the chain is changed from a large chain wheel to the chain path of the ^ wheel, as shown in Figure 8.-_Combining the chain path with the trimming of the tooth tip, we can know that the chain is in the lower chain 1 And the deflection of the lower teeth. Figure 8 (a) shows the chain position of the small sprocket when the chain pulls the chain towards the small keywheel when the chain guide pulls the chain towards the small keywheel and reaches the small sprocket according to the designated path of the extended lower chain; Figure 8 (b) ) For the guide key guide wheel when the key is pulled toward the small key wheel, the chain cannot deflect the key position of the large key wheel when it is not under the chain teeth; Figure 8 (c) shows that the guide wheel has not pulled the chain ^丨 To the chain, when the chain is located on the big wheel. The figure shows the forward direction of rotation of the sprocket set and the direction β 'of the chain traction by the guide chain. The number of links that determine the entire chain change path, the chain from the large sprocket to the small key

Page 14 V. Description of the invention (8) The relative position of the chain link yaw in the lower chain path of the wheel will be shown in Figure 8 (a). According to the deflection of the chain links in the lower chain path, observe the relationship between the links of the non-linear lower chain path of Yuan Qi. It can be seen that the first chain link of the lower chain · diameter is separated from the large sprocket ^ The starting roller (I) is located in the cogging of the large sprocket. The last link of the lower chain path is the link that reaches the small key_wheel. The end roller (E) is located in the cogging of the small sprocket. Inside, the relationship between the links and the links has a certain relative angle of inflection, '7, which is the corner of the i-th link relative to the i-4 link. The length of the chain (the center of the key roller roller _ the center of the special sprocket set must be between the radius of the large π sprocket and the length of the small sprocket, and · 7ί exhausted __-the current link # determines c, ie The position of the chain links in the path can be calculated, and the phase angle difference between the large and small sprocket can be rolled out of the chain by the roller at the beginning of the chain (I) at the position of the cog of the large key wheel until the chain reaches the end of the chain of the small sprocket The sub-position is determined, as shown in the phase angle (κ) shown in Figure 9.-Finally, the tooth sides of the large and small sprocket wheels are trimmed as shown in Figure 10, which is intended to cut the links of the lower chain path order, one is to remove The interference part of the upper chain between the chain link and the sprocket in the lower chain path is completed. Figure 11 The section of the side circle of the large sprocket and the key teeth after removing the interference part from 1 m I AA to Figure 10 Circle ^ 〇 After continuing the process of μ · ', using CATIA software to remove the sprocket interference can be five' Description of invention (9) Computer-aided manufacturing based on this. [Technical Features] 9- 9- ^ 1. This Creation of tooth shape trimming that distinguishes specific down-link points and non-down-link points, so as to accurately grasp the chain-shaped house on the sprocket-tooth arrangement And design and use this as the basis, instead of letting the chain change randomly. Qi 2 Guangben's creation of the decision of the down-chain path, the non-linear down-chain method to determine the position of the links in the down-chain path to improve. To understand the impact of the chain sprocket on the small sprocket when the lower chain action is completed.-3. Multi-stage sprocket for various bicycle rear transmission systems, + trimming mode has been established, such as 13 teeth and 28 The trimming method of the toothed sprocket set is to remove the 2 positions of the first 4 sprocket wheels and the 2 positions of the rear 2 sprocket wheels * *, [Effect] In [Creative Background], it was mentioned that the chain was changed from a large sprocket to a small one. The irregularity of the sprocket will directly reflect the rapid rotation of the angle of the transmission substrate. That is, the key change is not smooth. Many riding spans will gradually leave the chain from the large sprocket and enter the small. In the small sprocket cogging, at this time the angle of worship of the transmission substrate, •, and the angular velocity of the base plate / #, the angular acceleration of the substrate will inevitably change suddenly.

Page 16 V. Description of the invention (10) After the CNC code was generated by CATIA software, the prototype was processed by a milling machine and the experiment was performed. The chain was changed from large sprocket to small sprocket through ENCODER. Relative to the relationship of the rotation angle of the sprocket group, I performs a differential processing on f to obtain the relationship between the rotation angle < ---From the measurement results, it can be seen that the curve is much smoother, and it does solve the problem of not leaking down the chain. "—-." [Illustration] Above picture 〆: Schematic diagram of the action of the down chain. Schematic diagram of the sprocket 囷-(a) Non-downlink control (b) Control of the underlink * * Figure 3: Schematic diagram of the key link for controlling the trimming of the keypoint of the lower key point Λ (a) Top view circle (b) Front view circle four: Schematic circle diagram of the initial position of the sideways of the chain link when the chain action occurs. Jade: Schematic diagram of chain tooth gas, sharpness. ≫ (a) Non-chain gear tooth trimming (b) _ Gear tip trimming Figure 6: After the tooth tip of a large sprocket is trimmed, its lower chain point and

Page 17 f. Description of the invention (11) I Perspective view of the tooth tip of the lower chain point Figure VII: Schematic diagram of a non-linear chain path Figure VIII: Schematic diagram of chain deflection during chain change (a) Chain deflection during chain change Positional relationship between links (b) Interlinkage position of the chain when the chain deflection meets the non-lower teeth, * * (c) Positional relationship of the chain link without deflection before the chain change, 〆α:- Figure 9: Schematic diagram of the phase determination of large and small key wheels'-Figure 10: Schematic diagram of sprocket shape after completion Figure 11: Side view of Figure 10 and section view of key teeth Figure 12: Θ of the effectiveness of this creation, ^ / # ， 'Schematic diagram of the measurement correspondence relationship between βέΤ / β and ξ [Symbol description] ,, Figure 2: 1. Offset 2. Offset 1¾ Figure 3: 1. Sprocket 2. Guide chain 3. Key Key link (critical chain, c «) Figure 4: 1. Sprocket contact point (V,) 21. Non-downlink point (A,). 3. Critical chair, (critical chair,) Figure 5: 31. = only Existing thickness (〆,) 32. Existing tooth top thickness (wide,) 41. Non-chain tooth tip removal (L,),

Page 18% Five 'invention description (12) 42. Non-chain tooth tip cutting (z „2) 4. AA load surface 5. A'-A' cross section circle 6: 1. Chain point tooth after trimming Tips: 2 · Non-down chain · point tooth tips after trimming Figure 8: 1. Large sprocket 2 · Small sprocket 3. Sprocket group rotation forward direction 2-; guide chain guide traction chain% direction diagram Η —: 1 · Large key wheel 2. Small key wheel Λ 1. A multi-stage sprocket device of a self-driving rear-vehicle transmission system, which includes at least one large sprocket and one small sprocket. The new configuration functions to make the chain · When changing from a large sprocket to a small keywheel (lower chain action), it can be performed smoothly. Its characteristics are to properly trim the tooth tips of the large keywheel to control the lower chain position of the large sprocket and the two lower key positions. The chain position specifies the proper reel-to-hang path, and determines the phase of the large and small sprocket wheels, and removes the interference between the large and small sprocket wheels and the chain. 2. Please request the bicycle buried in item 1 of the patent scope, after Transmission system wheel set [, which is characterized by trimming the tooth shape of the sprocket ^, distinguishing specific lowering points on the large sprocket and non-ordering points to avoid the unexpected occurrence of the lowering action The design of the path, the arrangement of the phase angle and the basis of this, so that the chain change is no longer carried out with the fifth and the invention (13) machine; the setting of the non-downlink point is characterized by the intention of the large chain on the chain When the wheel is rounded, the side edge of the chain link is not trimmed out of the sprocket tooth tip due to the back side (the side facing away from the small sprocket), and the lowering action is delayed until the pigeon reaches the lower chain ► point, the chain link Due to the trimming of the sprocket tooth tip on the front side (the side facing the small sprocket), the side plate moves out of the sprocket tooth tip to perform the lower chain action. It is characterized by adopting a suitable down-chain path after computer-aided calculation to determine the down-key. Action. When the chain is changed, the position relationship between the links of the large chain wheel to the small chain wheel is determined; The link f between the knuckle and the outer chain link will be deflected under the traction of the chain guide pulley. Using this characteristic, the number of links in the entire chain change path can be determined after computer calculation, and then the chain is changed from a large chain wheel to The lower chain path of the small key wheel; the chain is switched from the large key wheel to the small key wheel. The first link (off the chain link), the starting roller is located in the cogging of the large sprocket, the last chain / link (finish key link) of the lower chain path is the link that reaches the small sprocket, k end The roller is located in the cogging of the small sprocket. Γ is located between the disengagement of the key front and the complete link (transition link).

Page 20 V. Description of the invention (14) There is a certain relative angle of inclination%, which is the angle of the i-th key rolling relative to the 钤 i -1 key joint,% Lu 0 and the roller of the transition key joint is ten to the center of the sprocket group The distance must be between the length of the large chain and the radius of the small sprocket. 4. ## 言 豪 & 琴! ^ 1 户户 告 述 & ++ @ & 系, 轮 轮 组 ^ ， It is characterized in that the phase angle of the large and small sprocket wheels is determined by the position of the chain from the position where the rollers are separated from the beginning of the chain link to the cogging of the large pigeon wheel until the chain reaches _ the end of the small chain wheel. π · 5 · As described in the scope of the application, the bicycle rear shifting system wheel set 1¾ described in item I of the application, most of the features are the inner and outer links ... arranged according to their position in the lower chain path. The -tooth side interference part of the sprocket is cut to form a pocket-shaped groove on the tooth side of the large sprocket.癀 6. As mentioned above in the scope of application for patents No. 1 to No. 5; its characteristic is that the trimming of the tooth tips and sides of large and small sprocket wheels will change the chain from large sprocket to small sprocket by specifying Path, to avoid. Unsmooth phenomenon of chain change "

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Page 22 V. Description of Invention (16) 恻 儡 方 _ 恻 Partial

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-X z- A-A (a) Non-downlink teeth Figure Page 23 恻 Provisioning 1 Z- A-A < b) Downlink point X V. Description of the invention (17)

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Page 24 V. Description of the invention (18)

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IliBlil Page 25 V. Description of the Invention (19)

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/ (a) Non-chain tooth tip (b) Chain tooth tip

Page 27

Page 28 V. Description of the invention (22)

V. Description of Invention (23)

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V. Description of the invention

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