TW467841B - The multi-stage sprocket assembly for the bicycle chain shifting - Google Patents

Abstract

The multi-stage sprocket assembly for the bicycle chain shifting A multiple sprocket assembly for use in a bicycle comprising at least a smaller diameter sprocket, a larger diameter sprocket disposed coaxially with the smaller sprocket, and a chain guide portion provided on both sprockets featured to guarantee a smooth chain shifting process from the smaller sprocket to the larger sprocket. The chain guide portion includes a supporting structure and an interference cutting. The supporting structure is located on the side face of the larger sprocket. It can support both outer-chain-links and inner-chain-links so that two types of chain shifting can be accomplished on the same tooth of the larger sprocket. The supporting structure also adjusts the leaving, rotary and engaging angles of transit chain links so as to increase the usable position of chain shifting. In order to achieve designated angles of the transit chain links, an interference cutting and tooth modification have to be performed on both larger and smaller sprocket.

Description

4 6 7-84 1 V. Description of the invention (1) *. The function of the multi-stage sprocket set of the bicycle shifting system is to guide the chain from the original coupled toothed disc to the desired change through the guidance of the transmission mechanism. The purpose of the chainring is to achieve the conversion of different gear ratios. The performance of the chain change directly affects the rider's smoothness and comfort. With the current technology used on large gears, because the difference in the number of teeth between adjacent gears is much larger than that of the multi-segment sprocket set of the rear flywheel, most of them adopt appropriate structures on the gears to support the links in the chain. To achieve the purpose of smooth chain change. But because the chain is formed by the outer link _ and the inner link are alternately connected, and the chain change is a random process, it is necessary to consider both the inner and outer link on the chain, known existing related patents, and teeth .. The side of the disc is dented to support the side chain. Although both the inner and outer chains can achieve the winding effect, this method will produce insufficient control force on the large gear, resulting in ... . In addition, the existing patent uses a protruding structure on the side of the toothed disc to support the side chain. However, this method can only support the outer chain plate and cannot support the inner chain plate. Therefore, when the inner chain plate is chained, it will fall and cause the chain to wind up. failure'. The invention mainly calculates the position of the support structure on the side of the toothed disc, so that the inner and outer links can achieve the winding effect at the same point. On the other hand, the turning link and the front and back can be changed by adjusting the position of the λ floor structure « The angle between the chain links, that is, the angle at which the chain is closed to the chainring, increases the position where the chain can be wound. Know-how In the multi-segment sprocket set of a bicycle transmission system, in order to improve the success rate and smoothness of gear shifting, many sprocket gear structure developments have been made in recent years. E.g

Page 6. 4 67 84 1 V. Description of the invention (2) US Patent Nos. 5,0 8 5, 6 2 1 and 5, 0 8 7, 2 2 6 have a structure using a side recess of the toothed disc. Avoiding the interference caused by the chain and the chainring during the chain change involves supporting the chain. In addition, U.S. Patent Nos. 4,889,521 and 5,400,942, 2 also have auxiliary key-up structures on the side of the toothed disc, in addition to making the winding smoother, it also has some functions to support the chain. The above structure has _ a major missing ’when the number of teeth between adjacent tooth discs is large, the key bar cannot get enough support during the chain change process and easily slips off, resulting in failure of the standard change. In response to this shortcoming, the US Patent Nos. 5, 1 92, 248, 5, 4, 13 and 5, 34, and .5, 464, 373 proposed related improvements. The main method is to add The structure is buckled with teeth or protruding to increase the support force of the key bar during the key change process and improve the success rate of the building change. However, the above structure also has a major deficiency. As shown in Figure 1, the chain is formed by the cross combination of the outer link plate 11, the inner key plate 12 and the roller 13. The above structure is only for the chain outside the chain ^ 11 to support, because the gear shift is a random process, it is impossible to predict that the outer plate or the inner link plate is in contact with this structure at the moment. If it is the inner link plate, the key bar will slide off and cannot be wound. This will cause vibration and noise, and also cause Shifting is delayed. Therefore, the conventional technology cannot effectively guarantee the upshift. .

4 67 84 1 V. Description of the invention (3) For the support, the winding type will be as shown in path 1 a, 1 b, 1 C. U is the center of the roller that is separated from the chain by the chain from the smaller toothed disc. 1 b is the key buckle • ... 丨 I., .. .- The key between the roller center of the chain link of the large chainring, the roller center point 1 a and the roller center point 1 b Winter straight in a space: line form, and an angle of 1 e with 15. The major disadvantage is that the smaller toothed disc must be at a fixed angle with the larger toothed disc 3, that is, the roller center point 1 a and point 1 b must have a fixed phase angle 1 d between the two toothed discs. Make point 1 and point 1 b ^: the distance of the straight line in space is an integer multiple of the chain pitch, such as U.S. Patent Nos. 4,8 8 9,5 2 No. 1, 5, 〇85, 621, .5, 087, 2 No. 2 No. 6, No. 5, 1 92, 248 and No. 5, 40 9, 42 No. 2 are the conventional patent technology institute: J times adopters. The position that exactly matches this angle between the small and large toothed discs is very rare. Under normal circumstances, a position close to this angle is often set as the key-up point. Therefore, an effective key-up path cannot be achieved, which generates vibration and voice or causes the chain to fail. . •... Objects of the invention The main object of the present invention is to provide a correct chain support structure, which can make the inner and outer plates of the chain suitable for winding when the number of teeth of the large and small discs is large. Support, so that the type of chain on the chain is as shown in the second diameter 4a, 4b, 4c, 4d. The links between 4b and 4c form a straight line, and the intersection angle 4e between 4a is called the chain escape angle. Large: The normal tooth center point 3a 'and the straight line 4b4c form an intersection angle 4f, which is called chain rotation = angle, 42 is then connected to the fastening chain link 43', and 42 and 43 also form an intersection angle 4g, which is called

Page 8 467841 V. Description of the invention (4). The mouth of person A needs to adjust the position of the auxiliary support device on the large toothed disc and the angle of the chain. The angles 4e, 4f, and 4g can be changed. . Therefore, although the distance between point 4b and point 3a is an integral multiple of 踫, as shown in Figure 3, the two sets of different phase negative degrees are not chain Langba... C u This, ίΓ ΤΓ, with the angle 4 e ′ 4 f, 4 g, 5 e, 5 f, and 5 g are adjusted in the case of 4 h and 5 h. 〇 Tightening of the chain link can also buckle the larger chainring smoothly, so that the position of the chain can be increased. . The invention relates to a multi-stage key wheel set used in a bicycle transmission system. The multi-stage sprocket device for a bicycle includes at least one small gear with fewer teeth and a large gear with more teeth. When shifting gears, the chain is changed. When the chain guide guides the winding process from the smaller gear to the larger gear, the appropriate key bar is designated on the large and small gears. The departure point and the engagement point are the first to escape from the smaller teeth. The link of the plate is set to be detached from the link. The link that was first buckled with the larger chainring is set to be a snap-in link, and the key before the snap-in link is set as a rod-folded link, which is separated from the link and the turning chain The internode is called the “over_crossing chain link”, which is characterized by: On the larger chainring and the smaller chainring, there is a support structure on the side facing the smaller chainring, which supports the chain link before the turning key green, so that it can be separated from the link to the turning link There is a linear relationship between the previous chain links; there is a support structure on the side opposite the smaller chainring on the larger plate, supporting the turning key link, so that the turning link and the previous chain link have an angle relationship; along the sprocket The direction of rotation, at least the front of the engagement point on the larger sprocket ~ between the tip of the tooth and the bottom of the tooth 'is adjacent to the smaller sprocket There are thousands of cuttings to eliminate the interference between the inner link plate and the chainring 'to maintain the angular relationship between the turning link and the previous chain link; 467841 V. Description of the invention (5) Follow the direction of rotation of the sprocket on the larger chainring At least the first two teeth of the buckle point have interference cutting to the side facing the center axis and the smaller tooth plate, eliminating the interference between the transition link and the larger tooth plate, and maintaining the angle relationship between the turning link and the previous chain link. ; 'In the direction of rotation of the sprocket, between the tip of the at least one front tooth or at least the back tooth on the smaller sprocket and the bottom of the tooth, the area included on the opposite side of the larger sprocket is opposite Interference cutting on the side eliminates the interference between the transition link and the smaller chainring, and maintains the angular relationship between the turning key link and the previous link. In addition, a multi-segment sprocket device is designed. A support structure is provided on the side facing the smaller chainring on the larger chainring to support the chain link before the turning chain link. The supporter can be the inner chain plate or the outer chain plate. _ 使 脱 _ 离 键 _ 节 到 _ * TURN_Bend a chain before the link. Links_ are in a straight line relationship. A branch structure is located on the side opposite to the small sprocket on the larger sprocket to support the turning chain link. The supporter is the inner link plate, so that the turning angle between the turning link and the previous link (Θ) Its range is less than or equal to 1 04. 48 degrees and greater than 0 degrees. Along the direction of rotation of the sprocket, at least the first two teeth of the engaging point on the larger sprocket to the area included in the central axis have interference cutting on the adjacent side of the smaller sprocket. Interference with larger gears, the minimum cutting width must be greater than or equal to the width of the chain plate, and the cutting angle must be consistent with the angle of the link before the turning link, maintaining the angle relationship between the turning link and the previous link . The two supporting structures have a protruding height of less than or equal to 1.0 mm, and must be shaped to provide chain plate support. In order to achieve the above functions, it is necessary to calculate

Page 10 4 β 7 84 1 V. 'Explanation of the invention (6) The total number of links between the disengaged link and the snap link. As shown in Figure 4, first specify the number of air teeth of the two-toothed discs, and select the link separation point 2 on the small toothed disc 2 and the flag on the large window disc 3. The linking point 3a, because 2a and 3a are the most The editing distance is a straight line, so the minimum required number of links between 2: a and 3a can be calculated. As shown in the last name on the picture, there are four links from the detached link 5 to the turning link 5 2. Four, the section is called the transition chain link :. Due to the difference in the number of teeth between the two toothed discs, and the position of the designated up key! The number of transition links will also change accordingly. After deciding the number of excessive links, geometric calculations must be applied to determine the turning angles of the disengaged links, the turning links, and the snap links. In Figure 5, after the chain turns, the 'roller center is aligned with the teeth. The center 2a coincides, and the roller center coincides with the 2 center 3a. Because 2E3a is a designated point in advance, it is. The straight line distance from 3a can be known from the previously determined number of excessive links, and the straight line distance between the roller center point 5 iodine 2a and 3a on the turning link 52, and the 5 flag & space distance is 3 times the chain pitch The space distance of 5 ^ 3a is double the chain pitch. Therefore, the triangles 5c, 2a, and 3a are the only decisions and the three internal angles can be obtained from the simple triangle function. g ('This I Hemingsi's' & ^ can be calculated. 〆b Each key knows the turning angle through this three-degree space geometric relationship can be through the map 丄 Can ... The number of transition links is η, the chain pitch Let's explain it in one step. Assume that the distance of W 3a is P, because 2a and dagger are selected, 2, and the distance is-', and assume that it is L. Therefore, Z; 疋: Therefore, the distance of 2 iodine and 3 can be obtained by the following trigonometric function formula know:

4 S7 84 1 V. Description of the invention. (7) Z2a5c3a = cos " \ (Kl) pf · ¥ (ρ) 2-ΰ 2χ ((«-φ) χ㈤ j Zn ^ = 180 ° -Z2α & 3 After the turning angle of the knot is determined to be 0, the chain changing path of the cold holiday key joint can be determined. Therefore, after selecting from the winding point, the chain changing path can be uniquely determined in this way. In a reasonable situation, L must meet the following formula To form this triangle: {n-\) p < L < np, •. ... · '. When L is exactly equal to an integer multiple of the chain pitch (. (N-1) p or np), there will be Two extreme cases arise. The first case is that when work = silicon, point 5c falls exactly on the connection between 2a and 3a, so Zθ = 0, and the transition link becomes a straight line at this time, so it cannot provide a transition as described above. Because of the characteristics of the chain link, it is one of the small pieces in the application. Another situation is: when. △ 5 c 2 a 3 a just becomes an isosceles triangle,

^ 2a5c3a = cos &quot; ^ ((»-1 Explanation (8) ^ = mm-Z2a5c3a = l'80 °-cos'1 —— [2 (^ 1)), if the number of transition links is 2 (n = 2), then Z0 = 18 (Τ-6 〇 · = 12〇 ·; if the transition • _... When the number of links is 3 (η = 3), then ΘΘ = 180_-75.52 · = 1 (M.48 ·; if the number of transition links is 4 (Η = 4), Bay 1J = 180 · -80.41 · = 99.59-, which is the situation in Figure 5. If the number of transition links approaches infinity (<-〇〇), then Zΰ = 180B-90 · = 90 ·: Therefore, the range of the maximum turning angle of the chain will vary depending on the winding point, that is, the number of transition links. It is based on the existing size-reasonable winding chain form and its radius range. That is, η must be greater than or equal to 3, also try to say that the chain turning angle is the maximum value of .48 •. In summary, the range of the chain turning angle is 0 &lt; M1 (M.48 ·.) As shown in Figure 2 It shows that if the chain cannot be properly supported, it will only be chained in a continuous mode, which cannot meet the calculated needs, so it must be The larger toothed disc plus the supporting structure is shown in Figures 31 and 32 in Figure 5. Although the circular structure is shown in the illustration, this structure does not have a specific shape and size, mainly to support the turning link And the transition chain link to make it reach the calculated turning angle. On the other hand, before the chain is buckled on the larger chainring, it will interfere with the two pieces of chainring, so in order to achieve the chain's predetermined turning angle

Page 13 4 6 7 8 4 1 ___ — _______ — V. Description of the invention (9) degree, it is necessary to cut off the interference part of the tooth plate 'on the smaller tooth plate, as shown in the structure 2 6 in Figure 7 and The characteristic of this cutting as shown in 2 5 is: · Rotate along the sprocket 乂 4 2 4 鱼 at the direction of rotation, the direction, the point on the smaller sprocket is separated from the point 2a "without the tip of the tooth 23 to the bottom of the tooth On the opposite side of the larger sprocket-there is dry = cutting on the opposite side, eliminating the interference between the transition key and the smaller sprocket 'to maintain the angle relationship between the turning key and the previous chain link. On the larger sprocket As shown in the structures 3 5 and 36 in Fig. 7, the characteristics of this cutting are: * The direction of rotation of the sprocket ^ The tip of a tooth 35 to the bottom of the tooth before engaging the point 3a on a larger toothed disc There is interference cutting on the side adjacent to the small tooth, and the internal link plate and the toothed disc are eliminated to maintain the angular relationship between the joint H and the previous chain link; and it is fastened to the large toothed disc 3a Zhiyu 34 tooth tip to the side of the central axis facing the smaller tooth plate, there is interference cutting. The minimum cutting width must be greater than the width of the chain plate. The angle of its sharp cut must be the link before the turning link. The degree of consistency is eliminated, and the inter-disc interference between the transition key link and the larger teeth is maintained, and the angular relationship between the turning link and the previous link is maintained. 6 This is an embodiment of the feature of the present invention. Structures 3 1 and-·-· ·. 3 2 really have another feature, of which Structure 3 1 can provide support for the inner link plate or the outer link plate at the same time, but the structure 32 only needs to provide the support of the inner link plate. The reason is that if the turning link 5 2 is an outer link plate, the turning link 5 2 can be smoothly fastened to the upper gear chain through the support of the interference cutting 3 6 and the structure 31 1 in FIG. 7, as shown in 5 in FIG. 8. 2 buckle the upper teeth 3 3, so in this case 3 2 is an unnecessary structure, but 3 1 must provide the support of the inner chain plate 5 4. Figure 9 is another embodiment of the features of the present invention. When the section 5 2 is the inner link plate, the inner link plate 5 2 has not been buckled yet.

Page 14 4 6 7 84

V. Description of the invention (ίο) Closing 3 3 .. It is necessary to fasten the chain link 5 3 to fasten the structure 32 to support the turning chain link 52 to reach a larger gear, so at this time there must be a predetermined turning angle 'structure 3 1 In turn, the support of the outer chain plate 5 4 is provided. The protruding height of the outer chain plate 5 and 2 must be less than or equal to that (also listed in Table 1, support structure 31 degrees), which is sufficient to provide chain plate support. (That is, the normal operation of the thick chain of the chain plate. (No chain change action), the right protruding height is greater than 1. Omm, in Figure 10 is another embodiment of the support structure. 2 interference to the chain. Section is the internal chain The outer chain board can pass through the problems caused by the ## $ 二 = key link and the conventional technology of the buckle chain service. The structure can obtain the proper support for the turning angle of gram. As shown above, the present invention uses the Adjust the chain link effect to increase the position where the groove can be changed between the large and small gears. In addition, the interference cutting can ensure that this mechanism can be achieved frequently. Intangible reduction 'f = f The user moves to the uncertain interval of the successful gear shift. It has also increased file quality and comfort in order to achieve industrial use value, which is indeed in line with the exclusive patents for invention, and abandoned the application for invention patents according to the law '

Page] 5 4 6 7 8 4 1---Schematic description of the description of the table. Table 1: The supporting structure and the chain link support plate supported by the 32. A brief description. A 'Picture 1: Bicycle chain Structured perspective view Figure 2: Comparison between the present invention and conventional technology Figure 3 · Description of the features of the present invention Figure 4: Determination of the number of transition links of the present invention Figure 5: Rotation angle of the links of the present invention Figure of decision and auxiliary supporting structure-Figure 6: Rotation angle of chain link of the present invention. Degree decision 圊 Figure 7: Interference cutting diagram of toothed disc of the present invention Figure 8: Example 1 of the features of the present invention Figure 9: This Embodiment 2 of the invention Figure 10: Example of a supporting structure (a) Other embodiment 1 (b) Other embodiment 2 Drawing number description: 1 1 ... outer key plate 12 ... inner key plate 1 3 ... roller 1 ... key bar la 'lb' 1 c ... roller center point

Page 16 467841 Simple illustration of the diagram 13 Roller 1 ... key bar la, lb, 1 c- ". Roller center

Id-1 e ”· • Phase angle. Cross angle small toothed disc 2 a ....... Key joint disengagement point 3 ...... Large toothed disc 3 a ...... Key joint engagement point 4a '4b, 4c' 4d Path 4 e ······················································································· etc. .... Key bar engagement angle. 4h, 5h ... Phase angle 4e, 4f '4g' 5 e '5 f 5' ... Key bar 2 a, 3 a ... tooth center 51 ... disengaged from the link 5 2 ... turned link 5 4 ... inner key plate 5 3 ... fastened the link 5b, 5c, 5 d ..... .Roller center 5 g ... Angle

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Claims (1)

4 6 7 8 4-1 VI. Patent Application Park '&quot; &quot; &quot; &quot; &quot;' --- 1. A multi-segment chain wheel set for bicycles _ _ / h. ^ Small number of small teeth Comparison of the number of discs and teeth, M $. Medium to medium include: One gear transmission mechanism is guided by a relatively large ::: large gear disk 'when changing' key ... In the process of keying up the large and small gear disks to the larger gear disk first The chain c breaks away from the smaller chainring and the break point, the table Ϊ =: before the coupling link-the link is determined as the turning chain k. The break between the chain 脱离 and the turning link is called rabbit loan. Its characteristics are: ] It is called a transition chain, that is, the chain Ϊ 齿 is adjacent to the smaller sprocket, and there is a supporting structure on the side facing the smaller sprocket, which supports the turning line: &amp; chain I, so that the detachment of the link to the link before the turning link is formed f The larger gear has a supporting structure on the gull side with the smaller gear, supporting the turning chain ^ Three makes the turning link an angle relationship with the previous link, ^: the direction of rotation of the sprocket, on the larger gear At least the front of the upper engagement point-teeth = between the bottom of the tooth and the side facing the smaller toothed disc, interference cutting, ^ rotating the sprocket. Direction, at least the first two tooth centers of the engaged point on the larger toothed disc The area of the shaft has interference cutting on the opposite side of the smaller toothed disc. According to the direction of rotation of the sprocket, at least one tooth or up to one tooth before and after the escape point on the smaller toothed disc. There is interference cutting between the tip and the bottom of the tooth, and the side opposite to the side facing the larger toothed disc. J 2 The multi-segment sprocket for a bicycle as described in the first item of the scope of the patent application is mounted on the larger toothed disc and the smaller toothed disc has a supporting structure on the side facing it. Page] 9 4-.6 7 8 4 1 VI. The applicant for the scope of the patent can apply for the inner link plate or the outer link plate. Please apply for the bicycle set described in the first item of the patent scope. On the side opposite to the smaller sprocket, there is a branch sprocket on the side of the branch to assemble the broken chain link, so that the buckle between the turning link and the previous link &amp; / structure 'branch is equal to 1 04. 48 degrees And greater than 0 degrees. Small range • · ν · ... 4. The self-made soap as described in the first item of the patent application scope ^: The area between the tooth and the central axis is adjacent to the smaller tooth. At least the first two of the ancient if Width-The minimum must be greater than or equal to that of Gan Gan. Its cut is consistent with the angle of the link before the turning link. Width, its cutting angle must be • 5. If the first application of the scope of the patent application, the supporting structure protrudes from the high-density bicycle assembly with multiple segments of sprocket assembly 'less than or equal to 1.0 off. ilH