BICYCLE CHAINRING AND BICYCLE CHAINRING UNIT

Abstract

Bicycle sprocket (11) with a rotational axis (X), comprising: a sprocket body (13) and several sprocket teeth (14) extending outwards in a radial direction with respect to the rotational axis (X) from the sprocket body (13); wherein the several sprocket teeth (14) have several tooth head sections (17) and several tooth root sections (18), each of the several tooth root sections (18) being located between a pair of tooth head sections (17) that are adjacent to each other in the circumferential direction with respect to the rotational axis (X); wherein the several tooth root sections (18) have at least one first tooth root section (19) with a first tooth root shape and at least one second tooth root section (20) with a second tooth root shape; wherein the first tooth root shape differs from the second tooth root shape;and wherein the second tooth root shape is formed such that the tooth root diameter (r1) on a side upstream with respect to the drive direction of rotation of the bicycle sprocket (11) is smaller than the tooth root diameter (r2) on a side downstream with respect to the drive direction of rotation.

Description

[0001] The present invention relates to a bicycle chainring and a bicycle chainring assembly.

[0002] Conventional bicycle sprockets are mounted on a crank arm and a rear hub assembly. A bicycle chain runs between a chainring on the crank arm and a sprocket on the rear hub assembly. With this design, the rotation of the crank arm is transmitted to the rear hub assembly via the chain, thereby turning the rear wheel.

[0003] For example, a pinion package disclosed in JP 2008-189 254 A consists of several pinions.

[0004] Each pinion consists of an annular pinion body and several pinion teeth. Each of the multiple pinion teeth projects radially outwards from the pinion body. Tooth root sections are formed between each pair of pinion teeth that lie next to each other in the circumferential direction of the multiple pinion teeth. In this example, each tooth root section has the same shape around its entire circumference.

[0005] With multiple sprockets, according to the conventional technique, during a gear shift, the chain is moved from one of the two axially adjacent sprockets to the other. In this case, the chain roller moves from a tooth root section of one sprocket to a tooth root section of the other sprocket.

[0006] With multiple sprockets according to conventional technology, the tooth root sections of the sprockets, between which the chain roller can move, are significantly restricted, since the tooth root sections are formed with the same shape around the entire circumference.

[0007] In other words, the chain roller cannot easily move between two sprockets in tooth root sections that exclude the tooth root sections of the sprockets between which the chain roller can move.

[0008] For example, when the chain roller moves from one sprocket to another, encountering tooth root sections between which the chain roller cannot easily move, the chain roller makes contact with a tooth head of the other sprocket before it contacts the tooth root section of the other sprocket. As a result, the chain roller cannot move smoothly from the tooth root section of one sprocket to the tooth root section of the other. For this reason, the position at which gear changes can be performed is limited on a conventional chainring.

[0009] The present invention was made with regard to the problem described above, and an object of the present invention is the provision of a bicycle chainring with which the shifting behavior can be improved.

[0010] A bicycle sprocket according to the present invention is a sprocket with a central axis of rotation. The bicycle sprocket comprises a sprocket body and several sprocket teeth. The multiple sprocket teeth extend radially outwards from the sprocket body with respect to the central axis of rotation.

[0011] The multiple sprocket teeth have multiple tooth head sections and multiple tooth root sections. Each of the multiple tooth root sections is located between a pair of tooth head sections that lie adjacent to each other in the circumferential direction with respect to the axis of rotation. The multiple tooth root sections have at least one first tooth root section and at least one second tooth root section. The at least one first tooth root section has a first tooth root shape. The at least one second tooth root section has a second tooth root shape. The first tooth root shape differs from the second tooth root shape.

[0012] In the bicycle chainring, the first tooth base shape of at least one first tooth base section differs from the second tooth base shape of at least one second tooth base section of the several tooth base sections.

[0013] As described above, by forming the first tooth base shape of the first tooth base section and the second tooth base shape of the second tooth base section in such a way that different shapes result, the position of a chain roller (see in Fig. 4 (solid line shown) at the second tooth root section in relation to the position of the chain roller (see in Fig. The position of the chain roller located at the first tooth root section (shown in Figure 4) can be intentionally relocated. The position of the chain roller, which is located at at least one of the first and second tooth root sections, can be changed circumferentially and / or radially with respect to the axis of rotation by relocating the position of the chain roller at the second tooth root section relative to the position of the chain roller located at the first tooth root section. As a result of changing the position of the chain roller during a gear shift, the chain roller can easily be positioned at the tooth root section of an adjacent sprocket without the chain roller coming into contact with the sprocket teeth of the adjacent sprocket. That is, the number of positions into which the chain can be shifted can be increased at the sprocket compared to conventional technology.This can improve the shifting behavior of the sprocket.

[0014] In a bicycle sprocket according to another preferred aspect of the present invention, the second tooth root shape can be configured such that the tooth root diameter on a side upstream of the drive direction of rotation of the sprocket is smaller than the tooth root diameter on a side downstream of the drive direction of rotation of the sprocket. In this case, the position of the chain roller on the second tooth root section can be intentionally shifted relative to the position of the chain roller located on the first tooth root section without affecting the drive performance of the sprocket.

[0015] In the bicycle chainring according to another preferred aspect of the present invention, the second tooth root section can have a linear section. In this case, the degree of displacement of the position of the chain roller on the second tooth root section can be readily adjusted relative to the position of the chain roller located on the first tooth root section.

[0016] In the bicycle chainring according to another preferred aspect of the present invention, the first tooth root shape can be symmetrical with respect to the tooth root centerline extending in the radial direction. In this case, the first tooth root section can be formed without further ado.

[0017] In the bicycle sprocket according to another preferred aspect of the present invention, the second tooth root shape can be asymmetrical with respect to the radially extending tooth root centerline. In this case, the position of the chain roller located on the second tooth root section can be suitably adjusted, and the degree of displacement of the position of the chain roller on the second tooth root section can be readily adjusted with respect to the position of the chain roller located on the first tooth root section.

[0018] In the bicycle chainring according to another preferred aspect of the present invention, the at least one first tooth root section can comprise several first tooth root sections. In this case, when combined with the second tooth root shape, the position of the chain roller on the second tooth root section can be effectively shifted relative to the position of the chain roller located on the first tooth root section.

[0019] In the bicycle chainring according to another preferred aspect of the present invention, at least two of the several first tooth root sections can be arranged next to each other in the circumferential direction with respect to the axis of rotation. In this case, when combined with the second tooth root shape, the position of the chain roller on the second tooth root section can be effectively shifted relative to the position of the chain roller located on the first tooth root section.

[0020] In the bicycle chainring according to another preferred aspect of the present invention, the at least one second tooth root section can comprise several second tooth root sections. In this case, the roller spacing of the bicycle chain and the tooth spacing of the bicycle chainring can be effectively shifted.

[0021] In the bicycle chainring according to another preferred aspect of the present invention, at least two of the several second tooth root sections can be arranged next to each other in the circumferential direction with respect to the axis of rotation. In this case, the position of the chain roller on the second tooth root section can be effectively shifted with respect to the position of the chain roller located on the first tooth root section.

[0022] In the bicycle chainring according to another preferred aspect of the present invention, the total number of first tooth root sections and the total number of second tooth root sections can differ. In this case, the position of the chain roller on the second tooth root section can be effectively shifted relative to the position of the chain roller located on the first tooth root section.

[0023] In the bicycle chainring according to another preferred aspect of the present invention, the total number of first tooth root sections can be greater than the total number of second tooth root sections. In this case, the position of the chain roller on the second tooth root section can be effectively shifted relative to the position of the chain roller located on the first tooth root section.

[0024] According to another preferred aspect of the present invention, the bicycle chainring can further comprise a shifting region. The shifting region is a region intentionally formed to facilitate the shifting of the bicycle chain from a small sprocket to the bicycle chainring. The small sprocket is located parallel to the axis of rotation next to the bicycle chainring. In this case, the number of shifting regions can be increased if the number of positions to which the chain can be shifted increases. Furthermore, the shifting region can be adjusted to allow the bicycle chain to shift more smoothly from the adjacent small sprocket to the bicycle chainring.

[0025] In the bicycle sprocket according to another preferred aspect of the present invention, the upshift region can comprise several upshift regions. In this case, the shifting behavior during an upshift operation can be improved.

[0026] In the bicycle chainring according to another preferred aspect of the present invention, at least one of the several upshifting regions can be provided near the second tooth root section. In this case, the second tooth root shape of the second tooth root section ensures that the chain roller is suitably positioned on the second tooth root section, and thus the upshifting behavior of the upshifting region near the second tooth root section can be improved.

[0027] Preferably, according to another preferred aspect of the present invention, the bicycle chainring can further comprise a downshift region. The downshift region is a region intentionally formed to facilitate the transfer of the bicycle chain from the bicycle chainring to a smaller chainring. The smaller chainring is located adjacent to the bicycle chainring in the axial direction parallel to the axis of rotation.

[0028] In this case, the number of downshift regions can be increased if the number of positions the chain can shift into increases. Furthermore, the downshift region can be adjusted so that the bicycle chain can be moved more smoothly from the large chainring to the adjacent small chainring.

[0029] In the bicycle sprocket according to another preferred aspect of the present invention, the downshifting region can comprise several downshifting regions. In this case, the shifting behavior during a downshifting operation can be improved.

[0030] In the bicycle chainring according to another preferred aspect of the present invention, at least one of the downshifting regions can be provided near the second tooth root section. In this case, the second tooth root shape of the second tooth root section ensures that the chain roller is suitably positioned on the second tooth root section, and thus the downshifting behavior of the downshifting region near the second tooth root section can be improved.

[0031] In the bicycle chainring according to another preferred aspect of the present invention, the second tooth root sections can be arranged sequentially in the circumferential direction. In this case, the position of the chain roller at the second tooth root section can be effectively shifted relative to the position of the chain roller located at the first tooth root section.

[0032] In the bicycle chainring according to another preferred aspect of the present invention, the multiple tooth root sections can have at least one third tooth root section. This at least one third tooth root section has a third tooth root shape. In this case, the third tooth root section with the third tooth root shape can ensure that the position of the chain roller on the third tooth root section is effectively shifted relative to the position of the chain roller located on the first tooth root section.

[0033] In the bicycle chainring according to another preferred aspect of the present invention, the total number of chainring teeth can be equal to or less than 20. Generally, in a chainring where the total number of chainring teeth is equal to or less than 20, the number of positions into which the chain can be shifted is limited. However, in the chainring according to the present invention, the number of positions into which the chain can be shifted can be increased, and thus the shifting performance can be improved.

[0034] In the bicycle chainring according to another preferred aspect of the present invention, the total number of chainring teeth can be equal to or less than 15. Generally, in a chainring where the total number of chainring teeth is equal to or less than 15, the number of positions into which the chain can be shifted is further limited. However, in the chainring according to the present invention, the number of positions into which the chain can be shifted can be increased, and thus the shifting performance can be improved.

[0035] A bicycle chainring assembly according to the present invention comprises the bicycle chainring shown above. In this case, a bicycle chainring assembly with excellent shifting characteristics can be provided.

[0036] In a bicycle chainring assembly according to another preferred aspect of the present invention, the bicycle chainring can be a sprocket. In this case, the shifting behavior of the sprocket can be improved.

[0037] In the bicycle chainring assembly according to another preferred aspect of the present invention, the bicycle chainring can be a chainring. In this case, the shifting behavior of the chainring can be improved.

[0038] According to the present invention, a bicycle chainring and a bicycle chainring assembly can be provided with which the shifting behavior can be improved.

[0039] In the following, exemplary embodiments of the present invention are described with reference to the accompanying drawings, wherein

[0040] Fig. 1 a front view of a bicycle according to a first embodiment of the present invention;

[0041] Fig. 2 a front view of two sprockets of several sprockets is;

[0042] Fig. 3 is a front view of a large-diameter pinion;

[0043] Fig. 4 is an enlarged front view of the sprocket teeth of the large diameter pinion;

[0044] Fig. 5 is a front view illustrating the positional relationship between the large diameter sprocket and a chain roller;

[0045] Fig. 6 is a front view illustrating the movement of the chain roller from the large diameter sprocket to a small diameter sprocket;

[0046] Fig. 7 is a front view of two pinions according to a second embodiment of the present invention;

[0047] Fig. 8 is an enlarged front view of the pinion teeth according to another embodiment of the present invention; and

[0048] Fig. 9 is an enlarged front view of the pinion teeth according to another embodiment of the present invention.

[0049] As in Fig. Shown in 1, a bicycle 1 according to one embodiment of the present invention, a chainring assembly 4 and a pinion assembly 5 (an example of a bicycle chainring assembly). The chainring assembly 4 , the pinion assembly 5 and a chain 2 Together they form a drive section. The chain 2 is between the chainring assembly 4 and the pinion assembly 5 tense.

[0050] The driving force is provided by the chainring assembly. 4 to the pinion assembly 5 about the chain 2 transferred. The pinion assembly 5 is on a rear wheel hub (not shown), which is in relation to the frame 3It is rotatable and mounted so that it rotates integrally with the rear wheel hub. The sprocket assembly 5 has several sprockets 10 and several spacers (not shown).

[0051] The multiple sprockets 10 They are preferably made of metal. In this example, each pinion is 10 A metallic, plate-shaped component. The multiple spacers are located between two axially adjacent pinions. 10 the multiple sprockets 10 arranged.

[0052] An embodiment of the present invention using two pinions is described below. 11 and 12 , shown in Fig. 2, which is the pinion assembly 5 form, described. The pinion 11 It is designed in such a way that it has a larger diameter than the other pinion. 12 has. The following describes the pinion. 11 as a large diameter pinion 11designated, and the other pinion 12 is described as a small diameter pinion gear 12 designated.

[0053] The large diameter pinion 11 (An example of a bicycle chainring) is axially adjacent to the small-diameter sprocket. 12 arranged. As in the Fig. 2 and Fig. As shown in point 3, the pinion has a large diameter. 11 a rotational axis X. As used herein, the terms “axial” and “axis direction” refer to a direction parallel to the rotational axis X.

[0054] As in Fig. As shown in section 3, the pinion has a large diameter. 11 a first sprocket body 13 (an example of a sprocket body), several first sprocket teeth 14 (an example of several sprocket teeth), a high-shift region 15 and several downshift regions 16 on.

[0055] The first sprocket body13 is formed in an essentially ring-shaped form. The first sprocket body 13 It is designed to rotate around a hub axle (not shown). The hub axle is attached to the frame. 3 mounted, and the rear wheel hub (not shown) is rotatably attached to the hub axle.

[0056] The first sprocket body 13 It is attached to the rear wheel hub, which is rotatable relative to the hub axle, so that it rotates integrally with the rear wheel hub. With this design, the first sprocket can rotate together with the rear wheel hub relative to the hub axle, or in other words, relative to the frame. 3 turn.

[0057] The first several sprocket teeth 14 are designed in such a way that the chain 2 which can intervene in these. The first several sprocket teeth 14 can be integral to the first sprocket body 13This is intended to be the case for the first several sprocket teeth. 14 on the outer circumferential section of the first sprocket body 13 arranged at intervals in the circumferential direction with respect to the axis of rotation X. Furthermore, each of the first several sprocket teeth runs along this path. 14 from the first sprocket body 13 in a radial direction outwards with respect to the axis of rotation X.

[0058] For example, the total number of several first sprocket teeth 14 equal to or less than 20. Specifically, the total number of the first sprocket teeth is important. 14 equal to or less than 15. This example describes an instance where the total number of multiple first sprocket teeth is 14 13.

[0059] As in the Fig. 2 and Fig. 3 shown, the several (13) first sprocket teeth 14 several (for example 13) tooth head sections17 and several (for example, 13) tooth base sections 18 on.

[0060] Each of the tooth base sections 18 is between a pair of the tooth head sections 17 provided for, which lie next to each other in the circumferential direction with respect to the axis of rotation X. In other words, each of the tooth root sections 18 is located between a pair of the tooth head sections 17 , which lie next to each other in the circumferential direction with respect to the axis of rotation X.

[0061] As in Fig. As shown in section 3, the multiple tooth base sections are 18 several (for example 6) first tooth base sections 19 and several (for example, 7) second tooth base sections 20 The total number of first tooth root segments. 19 and the total number of second tooth base sections 20 They differ from each other. Specifically, the total number of first tooth root segments is different. 19greater than the total number of second tooth base sections 20 The several first tooth base sections 19 are an example of at least one first tooth root segment. The several second tooth root segments 20 are an example of at least one second tooth base section.

[0062] As in Fig. As shown in section 3, the several first tooth root segments are 19 arranged sequentially in the circumferential direction. At least two of the several first tooth root segments are also 19 arranged side by side in the circumferential direction. Specifically, in a first region H1 forming the tooth root, the several first tooth root segments are 19 successively on the outer circumferential section of the first sprocket body 13 educated.

[0063] The first area H1 forming the tooth base is bordered by two boundary tooth head sections (a first boundary tooth head section) 17aand a second limiting tooth head section 17b ) defined, which are between the first tooth root sections 19 and the second tooth base sections 20 are arranged in the circumferential direction. Specifically, the first region H1 forming the tooth root is defined by a straight line that forms the upper midpoint of the first boundary tooth head section. 17a and connects the axis of rotation X, and a straight line that defines the upper center of the second limiting tooth head section 17b and connects the axis of rotation X, defined. The upper center of the first limiting tooth head section. 17a and the upper center of the second limiting tooth head section 17b are the middle of the tooth head section 17a , 17b in the circumferential direction. The first area H1 forming the tooth base has several first tooth base segments. 19 on.

[0064] Each first tooth base section 19 is so formed that it can act as a chain roller2a can absorb each first tooth root segment 19 It has a first tooth root shape. The first tooth root shape is symmetrical with respect to a first tooth root centerline S1, which runs in the radial direction. The first tooth root centerline S1 is a straight line that defines the rotational centerline X and the midpoint C1 of a distance between the tooth tips of a pair of circumferentially adjacent tooth tip sections. 17 connects. In this example, the first tooth base shape is essentially arc-shaped.

[0065] In this example, the several first tooth root segments 19 each a first switching tooth foot section 21 up. The first shift tooth root section 21 is a tooth root section that causes the chain roller to 2a from the large diameter pinion 11 onto the small diameter pinion 12 moved. The first shift tooth root sections 21are on a downstream side of a first downshift region 23 (described below) provided in the sprocket drive direction R.

[0066] As in Fig. As shown in section 3, the several second tooth root sections are 20 aligned sequentially in the circumferential direction. Furthermore, at least two of the several second tooth root segments are 20 arranged side by side in the circumferential direction. Specifically, in a second region H2 forming the tooth root, the several second tooth root sections are 20 successively on the outer circumferential section of the first sprocket body 13 arranged.

[0067] The second area H2 forming the tooth base is bordered by the first limiting tooth head section. 17a and the second limiting tooth head section 17bdefined as in the first area H1 forming the tooth base described above. The second area H2 forming the tooth base has several second tooth base sections. 20 on.

[0068] Each of the second tooth base sections 20 is trained to act as a chain roller 2a can absorb every second tooth root section 20 It has a second tooth root shape. The first tooth root shape described above is formed differently from the second tooth root shape. For example, the second tooth root shape is asymmetrical with respect to the second tooth root centerline S2, which runs in the radial direction. The second tooth root centerline S2 is a straight line that defines the rotational centerline X and the midpoint C2 of the distance between the tooth tips of a pair of circumferentially adjacent tooth tip sections. 17 connects.

[0069] Furthermore, as in Fig. As shown in Figure 4, the second tooth root shape is designed such that the tooth root diameter r1 on the side upstream of the sprocket drive direction R is smaller than the tooth root diameter r2 on the side downstream of the sprocket drive direction R. The second tooth root shape is formed by successively joining essentially two arcs.

[0070] For example, the second tooth base form consists of a first arc section 20a and a second arc section 20b The first arc section 20a forms a second tooth base section 20 on the side upstream of the sprocket drive direction R. The tooth root diameter of the first arc segment. 20a The diameter “r1” described above is the tooth root diameter r1 of the first arc segment. 20acorresponds to the length of a line segment that defines the axis of rotation X and a point that lies on the axis of rotation X in the arc of the first arc segment. 20a the nearest one connects.

[0071] The second arc section 20b forms the second tooth base section 20 on the side downstream of the sprocket drive rotation direction R. The tooth root diameter of the second arc segment. 20b The diameter “r2” described above is the tooth root diameter r2 of the second arc segment. 20b corresponds to the length of a line segment that defines the axis of rotation X and a point that lies on the axis of rotation X in the arc of the second arc segment. 20b The nearest one connects. The tooth root diameter r2 of the second arc segment. 20b is larger than the tooth root diameter r1 of the first arc segment 20a .

[0072] In this example, we show how in Fig. 3 shown, the several second tooth root sections 20 a second shift tooth foot section 22 up. The second shift tooth root section 22 is a tooth root section that causes the chain roller to 2a from the large diameter pinion 11 onto the small diameter pinion 12 moved. The second shift tooth root section 22 is on the downstream side of a second downshift region 24 (described later) provided in the sprocket drive direction of rotation R.

[0073] The upshift region 15 is a region that is deliberately created to shift the chain 2 from the small diameter pinion 12 , which is next to the large-diameter pinion 11 lies, towards the large diameter pinion 11 to facilitate in the axial direction parallel to the axis of rotation X.

[0074] As in Fig. Shown in section 3, this is the upshift region. 15 near the second tooth base sections 20 planned. For example, the upshift region 15 on the large diameter pinion 11 so designed that it is contained in the second area H2 forming the tooth base.

[0075] The upshift region 15 has a first recessed section 15a on. During a gear shift, an outer link of the chain 2 in the first recess section 15a arranged and leads the chain 2 towards the large diameter pinion 11 .

[0076] The first recess section 15a is on a side surface of one of the several first sprocket teeth 14 formed. The position at which the first recess section is formed. 15a The formed surface is not on the side of the first sprocket teeth. 14limited, and the first recess section 15a can be on a side surface of the first sprocket body 13 be educated.

[0077] The first recess section 15a is in a recessed shape on the side surface of the first sprocket tooth 14 formed. The lower part of the first recess section 15a is designed in such a way that it forms the outer link of the chain 2 absorbs. The aforementioned side surface is one of the small-diameter pinion gears. 12 Surface facing the axis.

[0078] In this configuration, when an upshifting process is performed, when the chain 2 with the small diameter pinion 12 The outer link of the chain is engaged. 2 near the first recess section 15a In this state, when the pinion has a large diameter 11and the small diameter pinion 12 to be turned, the chain 2 from the small diameter pinion 12 solved and with the first sprocket teeth 14 of the large diameter pinion 11 Intervention occurs in this way in the upshift region. 15 the chain 2 from the small diameter pinion 12 on the large diameter sprocket 11 switched on.

[0079] The multiple downshift regions 16 are regions that were deliberately created to shift the bicycle chain 2 from the large diameter pinion 11 towards the small diameter pinion 12 , which is next to the large-diameter pinion 11 to facilitate movement in the axial direction parallel to the rotational center axis X.

[0080] As in Fig. As shown in section 3, at least one of the several downshift regions is shown. 16 near the second tooth base sections 20 Provided. In this example, the multiple (for example, 2) downshift regions are 16 on the large diameter pinion 11 provided near the second area H2 forming the tooth base.

[0081] For example, the multiple downshift regions 16 a first downshift region 23 and a second downshift region 24 up. The first downshift region 23 is formed in such a way that it extends over the first tooth root-forming region H1 and the second tooth root-forming region H2. The second downshifting region 24 is formed in the first area H1 that forms the base of the tooth.

[0082] Each of the downshift regions 16 (the first downshift region 23and the second downshift region 24 ) has a second recessed section 16a and a third recess section 16b on.

[0083] During a gear shifting process, an inner link of the chain 2 in the second recess section 16a arranged and leads the chain 2 towards the small diameter pinion 12 .

[0084] The second recess section 16a is next to the third recess section 16b arranged in the circumferential direction. The second recess section is particularly noteworthy. 16a next to the third recess section 16b at the third recess section 16b arranged on the side downstream of the chain wheel drive direction R.

[0085] The second recess section 16a is on a side surface of the pinion with a large diameter 11formed. The second recessed section is particularly noteworthy. 16a on a side surface of a first sprocket tooth 14 (for example, tooth head section) 17 ) formed. The position at which the second recess section 16a The formed area is not on the side surface of a first sprocket tooth. 14 limited, and the second recess section 16a can be located on the side surface of the first sprocket body 13 be educated.

[0086] The second recess section 16a is in a recessed shape on the side surface of the large-diameter pinion 11 formed. The lower part of the second recess section 16a is designed in such a way that it engages the inner link of the chain 2 absorbs. The aforementioned side surface is one of the small-diameter pinion gears. 12 Surface facing the axial direction.

[0087] During a gear shifting process, the outer plate of the chain 2 in the third recess section 16b arranged and leads the chain 2 towards the small diameter sprocket.

[0088] The third recess section 16b is next to the second recess section 16a arranged in the circumferential direction. The third recess section is particularly noteworthy. 16b next to the second recess section 16a at the second recess section 16a arranged on the side upstream in the direction of rotation of the sprocket drive R.

[0089] The third recess section 16b is on the side surface of the pinion with a large diameter 11 formed. The third recessed section is particularly noteworthy. 16b on the side surface of the large-diameter pinion 11 at a position between a pair of first sprocket teeth 14(for example, a pair of tooth head sections) 17 ), which lie next to each other in the circumferential direction.

[0090] The second recess section described above 16a is on one of the first two sprocket teeth 14 (for example, the two tooth head sections) 17 ) formed. The position at which the third recess section 16b The formed surface is not on the side of the first sprocket teeth. 14 limited, and the third recess section 16b can be on a side surface of the first sprocket body 13 be educated.

[0091] The third recess section 16b is in a recessed shape on the side surface of the large-diameter pinion 11 formed. The lower part of the third recess section 16b is designed in such a way that it forms the outer link of the chain 2absorbs. The aforementioned side surface is one of the small-diameter pinion gears. 12 Surface facing the axis.

[0092] In this example, the third recess section 16b a deeper depth than the second recess section 16a In this example, there is a step between the lower part of the third recess section. 16b and the lower part of the second recess section 16a In the lower part of the third recess section 16b is the outer link of the chain 2 arranged. As described above, in the lower part of the second recess section. 16a the inner plate of the chain 2 arranged.

[0093] In this configuration, when a downshifting process is performed, when the chain 2 with the large diameter pinion 11The inner flap is engaged with the second recess section. 16a between the large diameter pinion 11 and the small diameter pinion 12 facing the third recess section. Furthermore, at this point the outer flap is aligned with the third recess section. 16b between the large diameter pinion 11 and the small diameter pinion 12 facing.

[0094] In this state, when the pinion has a large diameter 11 and the small diameter pinion 12 to be rotated, the outer link of the chain 2 towards the side of the pinion with the small diameter 12 from a section of wall 16c of the third recess section 16b pressed.

[0095] Then the chain roller 2a , which are located in the first shift tooth foot section 21 or the second shift tooth foot section 22is arranged from the first switching tooth foot section 21 or the second shift tooth foot section 22 solved.

[0096] That means the chain 2 begins to move away from the large-diameter pinion 11 to solve, and is solved with second sprocket teeth 26 of the small diameter pinion 12 The chain is thus activated. 2 from the large diameter pinion 11 onto the small diameter pinion 12 with the first downshift region 23 or the second downshift region 24 switched on.

[0097] The small diameter pinion 12 is next to the large diameter pinion 11 Arranged in the axial direction. The small-diameter pinion gear. 12 has a rotational axis X. The rotational axis X of the small-diameter pinion. 12is coaxial to the rotational axis X of the large-diameter pinion 11 The small diameter pinion 12 is designed in such a way that it integrates integrally with the large-diameter pinion. 11 rotates. The small-diameter pinion shown in this example 12 For example, a sprocket is used for the highest gear.

[0098] As in Fig. As shown in 2, the pinion has a small diameter. 12 a second sprocket body 25 and several second sprocket teeth 26 on.

[0099] The second sprocket body 25 is essentially ring-shaped. The second sprocket body 25 It is designed to rotate around the hub axle (not shown). The hub axle is attached to the frame. 3 mounted, and the rear wheel hub (not shown) is rotatably attached to the hub axle.

[0100] The second sprocket body25 It is attached to the rear wheel hub, which is rotatable relative to the hub axle, so that it rotates integrally with the rear wheel hub. This design allows the second sprocket to rotate together with the rear wheel hub relative to the hub axle, or, in other words, relative to the frame. 3 turn.

[0101] The several second sprocket teeth 26 are designed in such a way that the chain 2 which intervenes in these. The several second sprocket teeth 26 are on the second sprocket body 25 specifically designed for multiple second sprocket teeth. 26 on the outer circumferential section of the second sprocket body 25 provided at intervals in the circumferential direction with respect to the axis of rotation X. In addition, each of the several second sprocket teeth extends 26 from the second sprocket body 25in a radial direction outwards with respect to the axis of rotation X. This example describes a case where the total number of multiple second sprocket teeth 26 11.

[0102] The several (11) second sprocket teeth 26 exhibit several (for example, 11) tooth head sections 27 and several (for example, 11) tooth base sections 28 on. Each tooth root section 28 is between a pair of tooth head sections 27 provided for, which lie next to each other in the circumferential direction with respect to the axis of rotation X. In other words, each tooth root section 28 is located between a pair of tooth head sections 27 , which lie next to each other in the circumferential direction with respect to the axis of rotation X. Each of the tooth root sections 28 is so formed that it can act as a chain roller 2a records. In this example, the tooth root sections are28 formed in such a way that they have the same tooth base shape in the circumferential direction. That is to say, the tooth base segments 28 They are formed with the same shape around their entire circumference. In this example, the tooth base shape is essentially arc-shaped.

[0103] Are these large-diameter sprockets? 11 and the small diameter pinion 12 trained as described above, the chain 2 in the following way from the large diameter pinion 11 onto the small diameter pinion 12 moved.

[0104] For example, as in Fig. 5 shown, the chain 2 with the first sprocket teeth 14 of the large diameter pinion 11 between the first limiting tooth head section 17a and the second limiting tooth head section 17b (in the second area H2 forming the tooth base) in intervention.

[0105] Special features are, as in the Fig. 4 and Fig. 5 shown, the chain rollers 2a in the second tooth base sections 20 between the first limiting tooth head section 17a and the second limiting tooth head section 17b The position of the chain roller is located in the second area H2 forming the tooth base. 2a (for example, center position P) in the opposite direction of the chain wheel drive rotation direction R and in the direction of the rotation center axis X of the large diameter sprocket 11 moves when they move away from the first limiting tooth head section 17a to the second limiting tooth head section 17b This movement is achieved by forming the second tooth base shape of the second tooth base segments. 20 realized with the form described above. The position of the chain roller 2a (see in Fig. 4 (full line shown) can be seen in the second tooth root section 20 regarding the position of a chain roller 2a' (see in Fig. 4 (shown dotted line), which is located in the first tooth base section 19 is located, will be deliberately relocated.

[0106] The one with the in Fig. Position of the chain roller indicated by the dotted line shown in section 4 2a' is the position of the chain roller 2a in the case of a design in which the multiple tooth base sections 18 of the large diameter pinion 11 only from the several first tooth base sections 19 consist.

[0107] In this example, a chain roller is used. 201a (the chain roller 2a near the first limiting tooth head section 17a ) on the most downstream side of the sprocket drive direction of rotation R in the second area forming the tooth root H2 on the second tooth root section 20at a position near the first limiting tooth head section 17a arranged. On the other hand, a chain roller 201b (the chain roller 2a near the second bordering tooth head section 17b ) on the most forward side of the sprocket drive direction of rotation R in the second area forming the tooth root H2 on the second tooth root section 20 at a position near the second limiting tooth head section 17b arranged. The second tooth root section 20 , in which the chain roller 201b The arrangement corresponds to the second switching tooth foot section described above. 22 .

[0108] With the several second tooth base sections 20 (second tooth base shape) in the second area forming the tooth base H2, the number of tooth base sections in which the chain roller is located can be determined. 2a from the large diameter pinion 11 onto the small diameter pinion12 can be moved by changing the position (center position P) of the chain roller 2a increased in the manner described above.

[0109] For example, in the case of a design where the first sprocket teeth 14 of the large diameter pinion 11 only from the first tooth base sections 19 (first tooth root shape) exist, during a downshifting process the chain roller 2a from the large diameter pinion 11 onto the small diameter pinion 12 It can only move at one point. That is, during a downshift, it can only move in the first shift tooth root section. 21 , the chain roller 2a from the large diameter pinion 11 onto the small diameter pinion 12 move.

[0110] On the other hand, in the present embodiment, as in Fig. 6 shown, the first sprocket teeth 14 of the large diameter pinion 11 not only the first tooth base sections 19 (first tooth base form), but also the second tooth base sections 20 (second tooth root shape) on, and during a downshifting process the chain roller can 2a therefore from the large diameter pinion 11 onto the small diameter pinion 12 be moved in two places.

[0111] That is, in the present embodiment, the chain roller can be engaged during a downshifting process. 2a suitable for use with a large diameter pinion 11 onto the small diameter pinion 12 in the first shift tooth foot section 21 and the second shift tooth foot section 22 can be moved. This design allows for the use of a large-diameter pinion. 11The shifting behavior of the downshifting process will be improved.

[0112] The present invention can be applied to a pinion with a large diameter 111 and a small diameter pinion 112 (an example of a bicycle chainring), shown in Fig. 7, instead of the large diameter pinion 11 and the small-diameter pinion 12 as described in the first embodiment.

[0113] In the second embodiment, the tooth root sections consist of 118 of the large diameter pinion 111 from tooth base sections that are formed with the same shape around their entire circumference. Furthermore, the tooth base sections consist of 128 of the small diameter pinion 112 from tooth base sections with different shapes.

[0114] In the second embodiment, a description of the components, which are the same as those in the first embodiment, is omitted. Furthermore, the configuration, which is essentially the same as that of the first embodiment, bears the same reference numerals as the first embodiment. large diameter pinion

[0115] The large diameter pinion 111 features a third sprocket body 113 and third sprocket teeth 114 up. The third sprocket body 113 is designed in such a way that it has essentially the same design as the first sprocket body 13 according to the first embodiment, apart from the sprocket diameter.

[0116] The several third sprocket teeth 114 several tooth head sections 117 and several tooth root sections 118 on. The several tooth head sections 117are designed in such a way that they essentially have the same shape as the tooth head sections 17 According to the first embodiment, apart from the total number of tooth heads, in this example the total number of multiple tooth head sections is... 117 For example, 19. That is, the total number of third sprocket teeth. 114 For example, it is 19.

[0117] The several tooth base sections 118 They have the same shape around their entire circumference. For example, the tooth base shape of the several tooth base segments is the same. 118 The same in the circumferential direction. That is, as with the tooth root shape of the small-diameter pinion. 12 According to the first embodiment, the tooth root shape of the several tooth root sections is 118 the same in the circumferential direction.

[0118] Although not illustrated here, as in the first embodiment, an upshifting region and a downshifting region can be incorporated into the large-diameter pinion. 111 be planned.

[0119] The small diameter pinion 112 features a fourth sprocket body 125 (an example of a sprocket body) and several fourth sprocket teeth 126 (an example of several sprocket teeth).

[0120] The fourth sprocket body 125 is designed in such a way that it has essentially the same design as the second sprocket body 25 according to the first embodiment, apart from the sprocket diameter.

[0121] The several fourth sprocket teeth 126 several tooth head sections 127 and several tooth root sections 128 on. The several tooth head sections 127are designed in such a way that they essentially have the same shape as the tooth head sections. 27 According to the first embodiment, apart from the total number of tooth heads. In this example, the total number of multiple tooth head sections is 127 For example, 17. That is, the total number of fourth sprocket teeth. 126 For example, it is 17.

[0122] The several tooth base sections 128 exhibit several (for example, 9) third tooth base segments 129 (one example of at least one first tooth base segment) and several (for example, 8) fourth tooth base segments 130 (an example of at least one second tooth root segment). As just described, the total number of third tooth root segments differs. 129 and the total number of fourth tooth root sections 130 from each other. The total number of third tooth root sections is particularly noteworthy. 129greater than the total number of fourth tooth base segments 130 .

[0123] In this example, each of the several third tooth root sections has 129 a third tooth base shape, which is symmetrically formed, as in the first tooth base shape of the large-diameter pinion 11 according to the first embodiment. The third tooth root shape of each of the several third tooth root sections. 129 consists of, for example, a type of arc section.

[0124] Each of the several fourth tooth root sections 130 has a fourth tooth base form, which differs from the third tooth base form of the several third tooth base sections. 129 is formed. The fourth tooth base form of each of the several fourth tooth base segments. 130 is asymmetrically shaped, as in the second tooth base shape of the pinion with a large diameter 11according to the first embodiment. The fourth tooth root shape of each of the multiple fourth tooth root sections. 130 consists of, for example, two types of arc sections.

[0125] For this reason, a third tooth root-forming area H3, corresponding to the first tooth root-forming area H1, and a fourth tooth root-forming area H4, corresponding to the second tooth root-forming area H2, in which small-diameter pinions are located, are present. 112 formed as in the first embodiment. The third tooth root region H3 and the fourth tooth root region H4 are defined by a third limiting tooth head section. 127a and a fourth limiting tooth head section 127b defined.

[0126] The multiple (for example, 9) third tooth base sections 129 are contained in the third region H3, which forms the tooth base. The third tooth base sections 129show third shift tooth foot sections 121 on, which the first shift tooth foot sections 21 correspond. Furthermore, the several fourth tooth root segments are 130 The fourth area forming the tooth base, H4, is contained within it. The fourth tooth base sections 130 show fourth interchangeable tooth foot sections 122 on, which the second shift tooth foot sections 22 are equivalent to.

[0127] Although not illustrated here, an upshift region and a downshift region can be found in the small-diameter sprocket. 112 provided for, as in the first embodiment. Movement of the chain from the small diameter sprocket to the large diameter sprocket

[0128] Are these large-diameter sprockets? 111 and the small diameter pinion 112 trained as described above, the chain 2in the following way from the small diameter pinion 112 on the large diameter sprocket 111 moved.

[0129] For example, the chain 2 with the fourth sprocket teeth 126 of the small diameter pinion 112 between the third limiting tooth head section 127a and the fourth limiting tooth head section 127b (in the fourth area H4, which forms the base of the tooth) was intervened.

[0130] A chain roller is a special feature. 2a at every fourth tooth base section 130 between the third limiting tooth head section 127a and the fourth limiting tooth head section 127b The position of the chain roller is arranged in the fourth area H4 forming the tooth base, as in the first embodiment. 2a(for example, center position P) in the opposite direction of the chain wheel drive rotation direction R and in the direction of the rotational axis X of the small diameter sprocket 112 moves when they move away from the third limiting tooth head section 127a in the direction of the fourth limiting tooth head section 127b This movement is achieved by forming the fourth tooth base shape of the fourth tooth base segments. 130 realized with the form described above. The position of the chain roller 2a in the fourth tooth base section 130 Therefore, in relation to the position of a chain roller 2a , which are located in the third tooth base section 129 is located, will be deliberately relocated.

[0131] The positional relationship between the chain roller 2a , which are located in the third tooth base section 129 is located, and the chain roller 2a of the fourth tooth base 130This essentially corresponds to the positional relationship between the Fig. 4 chain rollers shown 2a , 2a' .

[0132] In the several fourth tooth root sections 130 (fourth tooth base shape) in the fourth area forming the tooth base H4, the number of tooth base sections in which the chain roller is located can be determined. 2a smooth operation of the small diameter pinion 112 on the large diameter sprocket 111 can be moved by changing the position (center position P) of the chain roller 2a increased in the manner described above.

[0133] For example, in the case of a design where the fourth sprocket teeth 126 of the small diameter pinion 112 only from third tooth base sections 129 (third tooth root shape) exist, during an upshifting process the chain roller 2a from the small diameter pinion 112on the large diameter sprocket 111 be moved in two places.

[0134] In this case, even if the pinion has a large diameter 111 and the small diameter pinion 112 are designed so that the chain roller 2a smooth operation of the small diameter pinion 112 on the large diameter sprocket 111 moved at a high-speed switching point, the chain roller 2a not easy to turn from the small diameter pinion 112 on the large diameter sprocket 111 at the other upshifting point. As a result, a small jolt can occur at the switching point during an upshifting process. 124 be generated.

[0135] On the other hand, in the present embodiment, as in Fig. 7 shown, the fourth sprocket teeth 126 of the small diameter pinion 112the third tooth base sections 129 (third tooth base form) and the fourth tooth base sections 130 (fourth tooth root shape) and therefore the chain roller can be affected during an upshifting process. 2a smooth operation of the small diameter pinion 112 on the large diameter sprocket 111 at two points, namely the switching points 123 and 124 , be moved.

[0136] This means that during an upshifting process, the chain roller 2a suitable for both switching points 123 and 124 be arranged. That is, at the two up-switching points 123 and 124 can the chain roller 2a smooth operation of the small diameter pinion 112 on the large diameter sprocket 111 can be moved. With this design, the pinion can have a small diameter. 112 to improve the switching behavior of the upshifting process.

[0137] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments specified above, and various modifications can be made without departing from the core of the present invention. In particular, the embodiments specified in this specification can optionally be combined in any way.

[0138] The first embodiment described above shows an example in which every second tooth root section 20 (second tooth base shape) from a first arch section 20a and a second arc section 20b consists. Furthermore, the second embodiment described above shows an example in which every fourth tooth root section 130 (fourth tooth base shape) consists of two types of arc sections, as in the first embodiment.

[0139] Instead, as in Fig. 8 shown, every second tooth root section 20 (second tooth base form) and every fourth tooth base segment 130 (fourth tooth base shape) from a first arch section 20a , a second arc section 20b and a linear section 20c exist. That is, the second tooth root segments. 20 and the fourth tooth base sections 130 can have a linear section.

[0140] In this case, the first arc section 20a and the second arc section 20b designed to have the same configuration as in the first and second embodiments. The linear section 20c is a section that includes the first arc section 20a and the second arc section 20b connects. In this way, the position of the chain roller can be adjusted. 2a at the second tooth base 20and the fourth tooth base section 130 regarding the position of the chain roller 2a , which are located in the first tooth base section 19 and the third tooth base section 129 located, can be intentionally relocated by the linear section 20c at the second tooth base 20 (second tooth base form) and on the fourth tooth base section 130 (fourth tooth base shape) is provided.

[0141] The first and second embodiments described above show an example in which the multiple tooth root sections 18 , 128 from the several first tooth base sections 19 (the third tooth base sections) 129 ) and the several second tooth base sections 20 (the fourth tooth base sections) 130 ) exist. Instead, as in Fig. 9 shows the several tooth root sections 18 , 128furthermore, at least a fifth tooth base section 30 (an example of a third tooth root segment).

[0142] In this case, the fifth tooth root segment 30 A fifth tooth base shape (an example of a third tooth base shape). The fifth tooth base shape consists of a first arch segment. 20a and a linear section 20d The first arc section 20a forms the fifth tooth base section 30 on the upstream side of the sprocket drive direction of rotation R. The linear section 20d forms the fifth tooth base section 30 on the downstream side of the sprocket drive direction of rotation R. The position of the chain roller 2a at the fifth tooth base 30 can be related to the position of the chain roller 2a , which are located in the first tooth base section 19 and the third tooth base section 129located, by forming the fifth tooth base section 30 , which is trained as described above, will be deliberately relocated.

[0143] The first embodiment described above shows an example where the upshift region 15 is planned at a location that serves multiple upshifting regions 15 However, they can be formed in the sprocket. In this case, at least one of the several upshift regions is affected. 15 near the second tooth base sections 20 planned.

[0144] In the first and second embodiments described above, the embodiment of the present invention was focused on the large-diameter pinion. 11 , 111 and the small diameter pinion 12 , 112 , which are made up of several sprockets 10The following are included and described. The design described herein, for example the design of the pinion with a large diameter. 11 and the small-diameter pinion 112 However, it is also applicable to other sprockets that are separated from the multiple sprockets. 10 are included.

[0145] In the first and second embodiments described above, only one of the large-diameter and small-diameter pinions has multiple tooth root shapes; however, the present invention is not limited thereto. Both the large-diameter and small-diameter pinions can have multiple tooth root shapes.

[0146] The bicycle chainring according to the present invention can have four or more different types of tooth root shapes. That is, the bicycle chainring according to the present invention can have a fourth tooth root shape, a fifth tooth root shape, and more tooth root shapes. Furthermore, the tooth root shapes are not limited to those shown in the examples of the present invention. Any other shape can be used, as long as the shape allows for the intentional displacement of the position of the chain roller. 2a regarding the position of the chain roller 2a , which are located in the first tooth base section 19 and the third tooth base section 129 is located, permitted.

[0147] The embodiments described above are examples in which the present invention is applied to the large-diameter pinion. 11 and the small diameter pinion 112The present invention can be applied to a chainring, but it can also be applied to a chainring assembly. That is to say, the present invention can also be applied to the chainring assembly. 4 applicable.

[0148] The present invention is applicable to a wide range of bicycle chainrings and bicycle chainring assemblies. Reference symbol list 1 bicycle 2 chain 2a Chain roller 2a' Chain roller 3 frames 4 chainring assembly 5-pinion assembly 10 sprockets 11 large-diameter pinions 12 small diameter pinions 13 first sprocket body 14 first sprocket tooth 15 Upshift region 15a first recess section 16 Downshift region 16a second recess section 16b third recess section 16c wall section 17 Tooth head section of the first sprocket tooth 17a first limiting tooth head section 17b second limiting tooth head section 18 Tooth root section of the first sprocket tooth 19 first tooth base section 20 second tooth base section 20a first arc section 20b second arc section 20c linear section 20d linear section 21 first switching tooth foot section 22 second switching tooth foot section 23 first downshift region 24 second downshift region 25 second sprocket body 26 second sprocket teeth 27 Tooth head section of the second sprocket tooth 28 Tooth root section of the second sprocket tooth 30 fifth tooth root section 111 large diameter pinions 112 small diameter pinions 113 third sprocket body 114 third sprocket teeth 117 tooth head sections 118 tooth root segments 121 third switching tooth foot sections 122 fourth interlocking tooth foot sections 123 Switching point 124 Switching point 125 fourth sprocket body 126 fourth sprocket teeth 127 tooth head sections 127a third limiting tooth head section 127b fourth bordering tooth head section 128 tooth root segments 129 third tooth base sections 130 fourth tooth root sections 201a chain roller 201b chain roller C1 Middle C2 Middle H1 first area forming the tooth base H2 second area forming the tooth base H3 third area forming the tooth base H4 fourth area forming the tooth base P Center position r1 Tooth root diameter on the side upstream of the sprocket drive direction of rotation r2 Tooth root diameter on the side downstream of the sprocket drive direction R Sprocket drive direction S1 first midline of the tooth base S2 second midline of the tooth base X pivot axis QUOTES INCLUDED IN THE DESCRIPTION

[0149] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0150] JP 2008-189254 A

[0003]

Claims

[1] Bicycle chainring ( 11 ) with a rotational center axis (X), having: a sprocket body ( 13 ) and several sprocket teeth ( 14 ), which extend in a radial direction with respect to the axis of rotation (X) from the sprocket body ( 13 ) run outwards; where the multiple sprocket teeth ( 14 ) several tooth head sections ( 17 ) and several tooth base sections ( 18 ) exhibit, with each of the several tooth base sections ( 18 ) between a pair of the tooth head sections ( 17 ) which are located next to each other in the circumferential direction with respect to the axis of rotation (X); where the several tooth base sections ( 18 ) at least one first tooth base section ( 19 ) with a first tooth base form and at least one second tooth base section ( 20 ) exhibiting a second tooth base form; and the first tooth base shape differs from the second tooth base shape. [2] Bicycle chainring ( 11 ) according to claim 1, wherein the second tooth root shape is formed such that the tooth root diameter (r1) is on a surface which is oriented with respect to the drive direction of rotation of the bicycle sprocket ( 11 ) the upstream side is smaller than the tooth root diameter (r2) on a downstream side with respect to the direction of drive rotation. [3] Bicycle chainring ( 11 ) according to claim 1 or 2, wherein the second tooth root section ( 20 ) has a linear section. [4] Bicycle chainring ( 11 ) according to one of the preceding claims, wherein the first tooth base shape is symmetrical with respect to the tooth base centerline (S1) extending in the radial direction. [5] Bicycle chainring ( 11) according to one of the preceding claims, wherein the second tooth base shape is asymmetrical with respect to the tooth base centerline (S1) extending in the radial direction. [6] Bicycle chainring ( 11 ) according to one of the preceding claims, wherein the at least one first tooth root section ( 19 ) includes several first tooth base sections. [7] Bicycle chainring ( 11 ) according to claim 6, wherein at least two of the several first tooth root sections ( 19 ) are arranged side by side in the circumferential direction. [8] Bicycle chainring ( 11 ) according to one of the preceding claims, wherein the at least one second tooth root section ( 20 ) comprises several second tooth base sections. [9] Bicycle chainring ( 11 ) according to claim 8, wherein at least two of the several second tooth root sections ( 20 ) are arranged side by side in the circumferential direction. [10] Bicycle chainring (11 ) according to one of the preceding claims, wherein the total number of first tooth root sections ( 19 ) and the total number of second tooth base segments ( 20 ) differ from each other. [11] Bicycle chainring ( 11 ) according to claim 10, wherein the total number of first tooth root sections ( 19 ) greater than the total number of second tooth base segments ( 20 ) is. [12] Bicycle chainring ( 11 ) according to one of the foregoing claims, further comprising: a high-shift region ( 15 ), which causes the shifting of the bicycle chain ( 2 ) from a small sprocket ( 21 ) towards the bicycle chainring ( 11 ) facilitated, whereby the small sprocket ( 12 ) in the axial direction parallel to the axis of rotation (X) next to the bicycle chainring ( 11 ) lies. [13] Bicycle chainring ( 11 ) according to claim 12, wherein the upshift region (15 ) includes several upshift regions. [14] Bicycle chainring ( 11 ) according to claim 13, wherein at least one of the several upshift regions ( 15 ) near the second tooth base segments ( 20 ) is planned. [15] Bicycle chainring ( 11 ) according to one of the foregoing claims, further comprising: a downshift region ( 16 ), which causes the shifting of the bicycle chain ( 2 ) from the bicycle chainring ( 11 ) towards a small sprocket ( 12 ) facilitated, whereby the small sprocket ( 12 ) in the axial direction parallel to the axis of rotation (X) next to the bicycle chainring ( 11 ) lies. [16] Bicycle chainring ( 11 ) according to claim 15, wherein the downshift region ( 16 ) includes several downshift regions. [17] Bicycle chainring ( 11) according to claim 16, wherein at least one of the several downshift regions ( 16 ) near the second tooth base segments ( 20 ) is planned. [18] Bicycle chainring ( 11 ) according to one of the preceding claims, wherein the second tooth base sections ( 20 ) are arranged one after the other in the circumferential direction. [19] Bicycle chainring ( 11 ) according to one of the preceding claims, wherein the multiple tooth base sections ( 18 ) have at least one third tooth base section with a third tooth base shape. [20] Bicycle chainring ( 11 ) according to one of the preceding claims, wherein the total number of multiple sprocket teeth ( 14 ) is equal to or less than 20. [21] Bicycle chainring ( 11 ) according to claim 20, wherein the total number of multiple sprocket teeth ( 14 ) is equal to or less than 15. [22] Bicycle chainring assembly (4 , 5 ), which is a bicycle chainring ( 11 ) according to one of the preceding claims. [23] Bicycle chainring assembly ( 5 ) according to claim 22, wherein the bicycle chainring ( 11 ) a pinion ( 10 ) is. [24] Bicycle chainring assembly ( 4 ) according to claim 22, wherein the bicycle chainring ( 11 ) is a chainring.

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