Multi-layer pinion configuration for rear wheel assembly of a bicycle and rear wheel assembly

Abstract

The invention provides a multi-layered pinion configuration for a rear wheel assembly of a bicycle with a chain gear shift device, wherein the multi-layered pinion configuration has a rotation axis and is adapted to be coupled rotationally resistant to a transmission of the rear wheel assembly, wherein the multi-layered pinion configuration comprises at least 11 pinions with different number of teeth. Each pinion has an inner side and an outer side in the area of its teeth and a pinion center plane between the inner side and the outer side and orthogonal to the rotation axis. The multi-layered pinion configuration is designed such that, after mounting, at least two pinions with the smallest number of teeth are implemented radially self-supporting and coupled to the transmission by at least one other pinion with a larger number of teeth, and the arrangement of the three pinions with the smallest number of teeth is such that the pinion center plane of the pinion with the third smallest number of teeth of the multi-layered pinion configuration extends in the area of an axial end face of the transmission or axially outside the transmission.

Description

Technical Field

[0001] This invention relates to a multi-layer pinion configuration for the rear wheel assembly of a bicycle with a chain-driven shifter, the multi-layer pinion configuration being adapted to be mounted on the rear wheel hub of the bicycle. The invention also relates to a rear wheel assembly for a bicycle with a chain-driven shifter having a multi-layer pinion configuration. Furthermore, the invention relates to a rear wheel assembly for a bicycle with a chain-driven shifter and a bicycle frame, wherein the rear wheel assembly is mounted on the rear wheel hub, and the rear wheel hub is connected to the bicycle frame. Background Technology

[0002] The rear wheel assembly for bicycles with chain-driven shifters typically includes a multi-pinion configuration coupled to the rear wheel hub via a drivetrain, or alternatively, via a drivetrain. This drivetrain is engaged with the rear wheel hub via a one-way clutch for torque transmission and is capable of torque transmission in one direction of rotation (drive direction), while being decoupled from the rear wheel hub in the other direction via a one-way mechanism. In the assembled state of the rear wheel assembly with the bicycle frame, the rear wheel hub is connected to the rear axle, which is then mounted on the corresponding fork ends of the bicycle frame at its opposite ends. Therefore, the bicycle frame defines a mounting width and an internal distance between the two fork ends to accommodate, for example, all components for mounting the rear derailleur, such as the wheel, drivetrain, multi-pinion configuration, hub caps, and possibly other components, fastened to the rear wheel hub.

[0003] In recent years, chain-driven shifting systems with a single sprocket in the pedal crank area have become increasingly sophisticated. This development has coincided with the widespread adoption of motor-assisted bicycles. However, this development is driven by the idea of ​​eliminating the heavy weight of multiple sprockets and corresponding front derailleurs. This development necessitates providing a sufficient number of gears on the rear multi-coil configuration (cassette freewheel) to offer a greater range of gear ratios. However, due to limited mounting width and the default width of commercially available chains, it is not possible to simply add any number of pinions to the multi-coil configuration to meet the growing demand for more gears and more pinions. The width of a standard chain and the corresponding width of each pinion are limiting factors in terms of available structural space (mounting width). Nevertheless, to improve the gear ratio with a limited number of pinions, it is necessary to increase the range of gear ratios between the largest and smallest pinions. For both professional and recreational cyclists, having the smallest possible gear (the largest pinion) and the largest possible gear (the smallest pinion) is particularly important. This allows for comfortable riding up steep slopes while achieving greater speeds with the same cadence. The intermediate pinions in a multi-coil configuration must be matched accordingly. Significant differences in transmission levels may occur between adjacent pinions, but this should generally be avoided.

[0004] In traditional solutions, the geometry of the transmission limits the need to provide a pinion for the largest possible gear ratio. The pinion is conventionally fastened to the radial circumference of the transmission, thus the minimum inner diameter (root circle) of the pinion is predetermined by the outer diameter of the transmission. When using transmissions commonly found in the market, the geometry of the transmission is precisely such that a minimum pinion with 11 teeth can be mounted on the pinion configuration.

[0005] However, cycling requires extremely small gears, specifically gears with 10 or fewer teeth. To meet this need, existing technologies employ new transmissions, distinct from the first type, that can accommodate gears with fewer than 11 teeth through appropriate design features. However, compared to standard solutions, these specialized solutions are more expensive due to lower production volumes. Furthermore, they are often incompatible with traditional rear wheel components and commercially available transmissions. Moreover, these specialized solutions are difficult to bring to market.

[0006] Document EP 1342657 B1 discloses a transmission device specifically designed to accommodate small pinions. This transmission device has a first tubular element that can be fastened to a bicycle wheel hub using a one-way mechanism. A second tubular element with a smaller diameter can be coupled to the axial outer end of the first tubular element. The second tubular element has an outer diameter smaller than the first tubular element and is capable of fastening and radially supporting a 10-tooth pinion on that outer diameter. One embodiment shows three pinions accommodated and radially supported on the second tubular element.

[0007] Patent application DE 102017004853 A1 discloses another scheme using two pinions with inner diameters smaller than the outer diameter of the transmission device. The two smaller pinions are connected by a first link and by another link to the smallest pinion arranged on the transmission device, and are secured by a locking element to prevent axial movement. The locking element has an outer diameter sufficient to engage with the radially inward region of the transmission device. In one embodiment, the two smaller pinions are implemented as self-supporting. Summary of the Invention

[0008] The purpose of this invention is to provide a multi-layer pinion configuration that simplifies existing solutions and allows for coupling with conventional transmission devices while making better use of the preset mounting width.

[0009] The solution of the present invention to achieve the above-mentioned objective is: a multi-layer pinion configuration for the rear wheel assembly of a bicycle with a chain-driven shifting mechanism. Furthermore, the solution of the present invention to achieve the above-mentioned objective is: a rear wheel assembly and a bicycle frame for a bicycle with a chain-driven shifting mechanism.

[0010] According to a first aspect of the invention, a multi-layer pinion configuration for the rear wheel assembly of a bicycle having a chain-driven gear mechanism has a rotating shaft and is adapted to be anti-rotationally coupled to the transmission of the rear wheel assembly. The multi-layer pinion configuration includes at least 11 pinions with different numbers of teeth, wherein each pinion has an inner and outer surface within its tooth region, and a pinion center plane located between the inner and outer surfaces and orthogonal to the rotating shaft.

[0011] The pinion center plane refers to the plane that is orthogonal to the central axis of the rear wheel hub and passes through the pinion, preferably through the radially outermost pinion tip. The distances between the pinion center plane and the two axial sides of the pinion are preferably equal, but not necessarily equal. These two sides of the pinion are referred to as the inner and outer sides. After the rear wheel assembly is assembled with the bicycle frame, the inner side faces the bicycle center plane, which is orthogonal to the rotation axis of the multi-layered pinion configuration and passes through the center point between the fork ends of the bicycle frame. The outer side of the pinion is arranged opposite the inner side and faces the rear fork end of the bicycle frame, which, after assembly, is closer to the drivetrain.

[0012] After installation, the multi-layer pinion configuration is constructed such that at least two pinions with the fewest teeth are radially self-supporting (i.e., not radially supported) and coupled to the transmission via at least one other pinion with a larger number of teeth. In the solution of the present invention, the three pinions with the fewest teeth are arranged such that the center plane of the third smallest pinion in the multi-layer pinion configuration extends within the region of the axial end face of the transmission or axially outside the transmission. That is, in the solution of the present invention, according to the first aspect of the invention, after installation, at least two pinions are fully positioned and at least partially positioned between the axial end face of the transmission and the rear fork end of the bicycle. Generally, the multi-layer pinion configuration is coupled to the transmission after installation, allowing torque to be transmitted from the multi-layer pinion configuration to the transmission.

[0013] According to the solution of the present invention, the three smallest pinions in the multi-layer pinion configuration, that is, the three pinions with the fewest teeth, are arranged axially outside the transmission device such that the center plane of the third smallest pinion is outside the axial end face of the transmission device, or geometrically coincides with this axial end face. This ensures that at least two of the smallest pinions, that is, at least two pinions with the fewest teeth, are completely arranged axially outside the transmission device, i.e., at the front of the transmission device. Therefore, at least for these two smallest pinions, the outer diameter of the transmission device no longer needs to be considered a limiting factor. Thus, the smallest pinions in the multi-layer pinion configuration can be constructed to be smaller than those in the prior art. Furthermore, in most gears, the bicycle chain moving between the front sprocket and the cassette is less skewed longitudinally compared to the prior art. This results in smoother operation and less wear on the transmission components.

[0014] Generally speaking, "smallest pinion", "second smallest pinion", and "third smallest pinion" refer to the corresponding pinions with the smallest, second smallest, and third smallest number of teeth in a multi-layer pinion configuration.

[0015] According to an improved embodiment of the present invention, after installation, the arrangement of at least the three pinions with the fewest teeth is such that the inner plane of the third smallest pinion, extending along its inner side, extends within the region of the axial end face of the transmission device or axially outside the transmission device. In other words, in this embodiment of the invention, after installation, the inner plane of the third smallest pinion coincides with the axial end face of the transmission device, or is even arranged axially outside the transmission device. In this embodiment of the invention, at least three pinions are completely arranged between the axial end face of the transmission device and the rear fork end of the bicycle. This further enhances the aforementioned effects, such as smoother operation and less wear on the transmission components.

[0016] In an improved embodiment of the invention, the axial outer end face of the transmission device is orthogonal to the rotation axis in a plane. Preferably, the end face that is orthogonal to the rotation axis and forms the surface of the transmission device that protrudes outwards most axially is considered the end face of the transmission device.

[0017] According to an improved embodiment of the present invention, the rear wheel assembly is designed such that torque is transmitted from the smallest pinion with the fewest teeth to the third smallest pinion via the adjacent second smallest pinion, and from this third smallest pinion to the transmission mechanism. In other words, the three smallest pinions are connected in a torque-transmitting manner after installation.

[0018] In one implementation, the two pinions with the fewest teeth are detachably connected after installation. Specifically, these pinions mesh with each other in a complementary torque-transmitting structure (such as spur gears), and a predefined rotational orientation is defined between the two pinions. For example, a detachable connection can be used, where the pinions engage with corresponding grooves on adjacent pinions via a snap tooth on one pinion. The predefined rotational orientation can be achieved, for example, by having one snap tooth and its corresponding groove have different dimensions than the other snap teeth and grooves, such that the snap tooth can only engage with its corresponding groove. Adjustability of the rotational orientation of the teeth on the pinions allows for flexible shifting, thereby improving riding comfort.

[0019] Alternatively, according to another embodiment of the invention, the two pinions with the fewest teeth are connected in an inseparable manner after installation. This inseparable connection can be achieved in a monolithic construction or by applying joining processes, such as welding or bonding, when constructed separately. Furthermore, 3D printing technology can also be used to print two or more pinions as a single integral part. In this 3D printing process, the pinions can be separated, for example, only by breaking them apart. Alternatively, two pinions can be integrally manufactured using other processes, such as cutting processes, such as turning.

[0020] To achieve chain link engagement, two adjacent pinions in a multi-pinion configuration can be axially spaced apart and connected, or can be connected, by a connecting member. A flange section or retaining bolt extending parallel to the rear axle can be provided as a connecting member between the pinions and adjacent pinions. The flange section can be, for example, an annular element. These connecting members can extend between the two pinion faces facing each other. Alternatively, all or some of the pinions in the multi-pinion configuration can be integrally constructed with the connecting member. In both alternatives, the distance between the pinions can be determined by the connecting member. The connecting member can also be designed such that it can transmit torque between the pinions it connects to. The connecting member can be arranged on the inner circumference of the pinion to be connected, whether the diameter is smaller or larger. For example, this determines the inner diameter of at least one of the pinions connected by the connecting member. Furthermore, adjacent pinions can also have the same inner diameter. For example, the two pinions with the fewest teeth can share the same inner diameter.

[0021] The arrangement of at least two pinions in front of the transmission, as advocated above, allows these two pinions, preferably three, with the fewest teeth, to at least partially span the transmission on the end side. That is, when viewed axially, they are arranged in front of the transmission and at least partially cover it in this viewing direction. Preferably, the transmission is also spanned as described above by pinions mounted on the transmission to directly or indirectly transmit torque.

[0022] According to an improved embodiment of the invention, at least two radially self-supporting pinions are axially fixed after installation to prevent axial movement relative to the transmission. For this purpose, a sealing element, for example constructed as a helical plug, can be provided, adapted to engage externally with the internal threads of the transmission.

[0023] According to an improved embodiment of the invention, in order to arrange the sealing element in a space-saving manner, the invention proposes that the pinion with the fewest teeth has axial and radial grooves, preferably annular, on its outer surface. These grooves are adapted to accommodate at least one section of the sealing element axially and radially. The sealing element may have a protrusion or flange at its axial end, which, after installation, fully or partially engages with the groove. Thus, the protrusion and the pinion with the fewest teeth are axially flush. Alternatively, the protrusion may extend axially from the groove, and further axially from the pinion with the fewest teeth, for example, by a maximum of 2 mm, preferably a maximum of 1.7 mm. The protrusion may, for example, extend from the groove by 1.55 mm + / - 0.20 mm.

[0024] According to one embodiment of the invention, the inner diameter of the pinion with the fewest teeth is equal to or smaller than the internal thread diameter of the transmission device, and this internal thread is adapted to accommodate the external thread of the sealing element. The aforementioned thread provides a feasible connection between the sealing element and the transmission device, thereby axially fixing at least two self-supporting pinions.

[0025] Generally, especially in mass-produced products, threaded connections make it impossible to achieve precise angular positioning between the screwed components. Furthermore, in bicycle technology, components are sometimes disassembled for maintenance or repair purposes, further increasing the difficulty of re-establishing precise angular positioning between the threaded connections after reassembly. However, in higher-priced bicycle shifting mechanisms, it is precisely necessary for the pinions to have a predetermined angular positioning after installation to ensure that the chain shifting process between the pinions is flexible and almost imperceptible to the rider, thereby ensuring the most continuous torque transmission possible. Therefore, according to an improvement of the invention, when the sealing element and the transmission are threadedly connected, the rotational orientation of at least two pinions arranged in front of the transmission is independent of the thread position. Therefore, according to an improvement of the invention, at least the smallest pinion can rotate relative to the sealing element. Alternatively, at least two smallest pinions can also rotate relative to the sealing element. The rotational orientation of the smallest pinion, preferably at least two smallest pinions, relative to the pinion with a larger number of teeth can be set in such a way that it is independent of the thread position between the sealing element and the transmission. For example, the smallest pinion can be determined by a suitable fixing member before, during, or after connecting the sealing element to the transmission, preferably by the rotational orientation of at least two smallest pinions. By defining the rotational orientation between two adjacent pinions, the tooth profiles of the pinions are aligned with each other, making it easy for the bicycle chain to disengage from engagement with one pinion and engage with the adjacent pinion, thus making shifting smooth.

[0026] According to one embodiment of the invention, the multi-layer pinion configuration of the invention enables the configuration to include at least 12 pinions. In an improved embodiment of the invention, the multi-layer pinion configuration can even include at least 13 pinions. The largest pinion can have at least 48, particularly 50, 51, or 52 teeth. The smallest pinion can have 10 teeth. According to the invention, smaller pinions can have less than 10 teeth, for example, 9 or 8 teeth. The minimum number of teeth is limited by the minimum possible inner diameter of the smallest pinion associated with the chain used.

[0027] Coupling with the first type of transmission (“standard transmission”)

[0028] According to another aspect of the invention, a multi-layer pinion configuration for the rear wheel assembly of a bicycle with a chain-driven shift mechanism has a rotating shaft and is adapted to be anti-rotationally coupled to the transmission of the rear wheel assembly. The multi-layer pinion configuration includes at least 11 pinions with different numbers of teeth, wherein each pinion has an inner and outer surface within its tooth region, and a pinion center plane located between the inner and outer surfaces and orthogonal to the rotating shaft.

[0029] In particular, this multi-layer pinion configuration is constructed such that it can be coupled to or coupled with a first type of transmission device. Specifically, the multi-layer pinion configuration is constructed such that, after installation, when the axial length of the first type of transmission device from the transmission device stop to the axial outer end is in the range of 34.5 mm to 35.9 mm, preferably 34.9 + / - 0.3 mm, the following applies: a first axial distance from the transmission device stop to the outer surface of the pinion with the fewest teeth is greater than 38 mm. To better utilize the available installation width, the first distance is preferably greater than 39.1 mm, more preferably 39.9 + / - 0.2 mm. Alternatively or supplementarily, in the first type of transmission device, a second axial distance from the axial outer end of the first type of transmission device to the outer surface of the pinion with the fewest teeth is greater than 4.0 mm, preferably 5.0 + / - 0.2 mm. The axial outer end of the transmission device can refer to the transmission device end face closer to the pinion with the fewest teeth after installation.

[0030] The first type of transmission device widely used in the prior art and market, for example, by name Sales of transmission devices, or HG transmission devices for short.

[0031] According to one embodiment of the invention, a first type of transmission device may have a transmission profile in a first region of its radially outer surface, the transmission profile being arranged along a first axial length outward from the transmission device stop. The transmission profile is adapted to engage with a complementary profile on the inner circumferential surface of a multi-layered pinion configuration. The transmission profile may include transmission protrusions or so-called splines, which may be distributed around the periphery of the radially outer surface of the transmission device. At least one of the transmission protrusions or splines may differ from the others, for example, being wider or narrower circumferentially, wherein in this case, the complementary profile acting in conjunction with this transmission protrusion or spline must have correspondingly complementary geometry. This ensures the desired rotational orientation of the pinions in the multi-layered pinion configuration secured to the complementary profile. The transmission profile may include 8, 9, or 22 transmission protrusions / splines, with a preferred number of 9 or more splines.

[0032] Furthermore, according to one embodiment of the invention, in the first type of transmission device, the first axial length may be less than the second axial length extending from the transmission device stop to the axial outer end side of the transmission device. The first type of transmission device may not have a transmission member profile, for example, in the form of a smooth cylindrical outer circumferential surface, on a second region of its radially outer surface adjacent to the axial outer end side. Furthermore, the first type of transmission device may have an opening extending radially outward from the central axis of the transmission device and axially inward from the axially outer end side of the transmission device. This opening may have internal threads on its radially inner surface.

[0033] The aforementioned sealing element can, for example, be screwed into the internal thread of a first-type transmission device with its external thread. This results in a particularly simple and reliable installation solution.

[0034] In another embodiment of the invention, the first axial length of the first type of transmission device from the transmission device stop to the end of the transmission member profile is greater than 32.9 mm, preferably 33.2 mm, and the transmission member profile is arranged on the transmission device along this first axial length. As an alternative or supplementary solution, the second axial length of the transmission device from the transmission device stop to the end side of the transmission device is greater than 34.2 mm, preferably 34.9 + / - 0.2 mm.

[0035] Furthermore, the outer diameter of the first type of transmission device determines the minimum inner diameter of the pinion to be housed thereon. The first outer diameter of the first type of transmission device within a first region along its first axial length is greater than 34.2 mm, preferably 34.5 + / - 0.15 mm. Alternatively or as a supplement, the second outer diameter of the first type of transmission device within a second region adjacent to its end side is greater than 31.4 mm, preferably 32.1 + / - 0.2 mm. In another alternative or as a supplement to the aforementioned diameter, the first outer diameter of the internal thread of the first type of transmission device axially adjacent to its end side is greater than 29.8 mm, preferably 30.6 + / - 0.2 mm. These outer diameters are also referred to as nominal diameters. The preferred pitch of the internal thread of the first type of transmission device is 24 TPI, such that, according to known dimensioning, the thread can be characterized as M 30.6 × 24 TPI.

[0036] The features of the multi-layer pinion configuration in the foregoing aspects of the invention and embodiments can be combined.

[0037] Coupling with the second type of transmission device (“miniature spline transmission device”)

[0038] According to another aspect of the invention, a multi-layer pinion configuration for the rear wheel assembly of a bicycle with a chain-driven shift mechanism has a rotating shaft, and the multi-layer pinion configuration is adapted to be anti-rotationally coupled to the transmission of the rear wheel assembly. The multi-layer pinion configuration includes at least 11 pinions with different numbers of teeth, wherein each pinion has an inner surface and an outer surface within its tooth region, and a pinion center plane located between the inner and outer surfaces and orthogonal to the rotating shaft.

[0039] In particular, this multi-layer pinion configuration is constructed in a way that allows it to couple with or be coupled to a second type of transmission device. Specifically, the multi-layer pinion configuration is constructed such that, after installation, when the axial length from the transmission device stop to the outer axial end of the first type of transmission device is in the range of 25mm to 27mm, preferably 26.0+ / -0.2mm, the following applies: the first axial distance from the transmission device stop to the outer surface of the pinion with the fewest teeth is greater than 34mm, preferably 35.0+ / -0.2mm. Alternatively or supplementarily, in the second type of transmission device, the second axial distance from the outer axial end of the second type of transmission device to the outer surface of the pinion with the fewest teeth is greater than 8.0mm, preferably 9.0+ / -0.2mm.

[0040] According to this aspect of the invention, each pinion has an inner surface and an outer surface within its tooth region, as well as a pinion center plane located between the inner and outer surfaces and orthogonal to the rear hub. The definitions of the surfaces and planes mentioned herein are given in the preceding description of the invention.

[0041] The second type of transmission device, which is widely used in the prior art, is sold for example under the name "miniature spline".

[0042] The second type of transmission device may have a transmission element profile on a first region of its radially outer surface, the transmission element profile being arranged along a first axial length extending outward from the transmission device stop. This transmission element profile may be designed corresponding to the description of the first type of transmission device above. The transmission element profile of the second type of transmission device may include 8, 9, or 22 transmission element protrusions / splines, with 9 or more splines being preferred. Alternatively, exactly 22 splines are preferred. In the second type of transmission device, the first axial length may also be less than the second axial length extending from the transmission device stop to the end side of the second type of transmission device. The second type of transmission device may not have a transmission element profile on a second region of its radially outer surface adjacent to the end side of the transmission device, for example, in the form of a cylindrical circumferential surface. Furthermore, the second type of transmission device may have an opening extending radially outward from the central axis of the transmission device and axially inward from the outside. This opening may have internal threads on its radially inner surface.

[0043] According to an improved embodiment of the present invention, the aforementioned sealing element can, for example, be screwed into the internal thread of a second type of transmission device by its external thread.

[0044] According to one embodiment, the first axial length of the second type of transmission device from the transmission device stop portion to the end of the transmission member profile is greater than 24.7 mm, preferably 25.7 + / - 0.2 mm, and the transmission member profile is arranged on the second type of transmission device along this first axial length. Alternatively or supplementarily, the second axial length of the second type of transmission device from the transmission device stop portion to the end side of the second type of transmission device is greater than 25.0 mm, preferably 26.0 + / - 0.2 mm.

[0045] Furthermore, the outer diameter of the transmission device determines the minimum inner diameter of the pinion to be housed thereon. The first outer diameter of the second type of transmission device in a first region along the first axial length of the second type of transmission device is greater than 31.6 mm, preferably 32.60 + 0.05 / - 0.1 mm. This first outer diameter is determined by the radial extension of the transmission member profile. The diameter of the base surface connecting the transmission member profile can be reduced by the height of the transmission member profile, and is preferably 30.1 + / - 0.2 mm. As an alternative or supplementary option, the second outer diameter of the second type of transmission device in a second region adjacent to the axial outer end side of the transmission device is greater than 28.5 mm, preferably 29.5 + / - 0.1 mm. In another alternative or as a supplement to the aforementioned diameter, the first nominal diameter of the internal thread of the second type of transmission device axially adjacent to its end side is greater than 25.2 mm, preferably 26 mm + / - 0.2 mm.

[0046] Coupling with the third type of transmission (“XD transmission”)

[0047] According to another aspect of the invention, a multi-layer pinion configuration for the rear wheel assembly of a bicycle with a chain-driven shift mechanism has a rotating shaft, and the multi-layer pinion configuration is adapted to be anti-rotationally coupled to the transmission of the rear wheel assembly. The multi-layer pinion configuration includes at least 11 pinions with different numbers of teeth, wherein each pinion has an inner surface and an outer surface within its tooth region, and a pinion center plane located between the inner and outer surfaces and orthogonal to the rotating shaft.

[0048] In particular, this multi-layer pinion configuration is constructed such that it can be coupled to or coupled with a third type of transmission. Specifically, the multi-layer pinion configuration is constructed such that, after installation, when the axial length from the transmission stop to the outer axial end of the first type of transmission is in the range of 28.5 mm to 30.5 mm, preferably 29.5 + / - 0.2 mm, the following applies: a first axial distance from the transmission stop to the outer surface of the pinion with the fewest teeth is greater than 38 mm. When the first distance is preferably greater than 39.1 mm, and more preferably 39.9 + / - 0.2 mm, the available mounting width can be utilized more advantageously. Alternatively or supplementarily, in the first type of transmission, a second axial distance from the outer axial end of the first type of transmission to the outer surface of the pinion with the fewest teeth is greater than 9.1 mm, preferably 10.4 + / - 0.2 mm. The aforementioned sizes of the first and second distances allow for more efficient utilization of the mounting width available for the rear wheel assembly. For example, a multi-pinion configuration with more pinions can be used, or the multi-pinion configuration can be placed further out in the axial direction to reduce chain skewing.

[0049] The definitions of the surfaces and planes mentioned are given in the preceding description of the invention. This aspect of the invention relates to a multi-layered pinion configuration that is coupled to, or can be coupled to, a transmission device different from the first and second types of transmission devices, and is hereinafter referred to as a third type of transmission device.

[0050] The third type of transmission device refers to, for example, those named XD TM The main body of the transmission device is the transmission device sold.

[0051] According to another aspect of the invention, the third type of transmission device is implemented as a multi-component device, and in one embodiment of the invention, includes a transmission device body and a receiving body. The transmission device body may have external threads on its outer peripheral surface in a region adjacent to the transmission device stop. The receiving body has internal threads on its inner peripheral surface, which are adapted to engage with the external threads of the transmission device body.

[0052] After the multi-component transmission device is installed, the housing can be arranged radially outside the transmission device body, and extend axially outward from the transmission device body at its axial outer end. The inner diameter of the axial outer end of the housing can be smaller than the outer diameter of the transmission device body.

[0053] In one embodiment, the third type of multi-component transmission is part of the rear wheel assembly, and the third type of transmission is coupled to or can be coupled to a multi-level pinion configuration. The at least two pinions with the fewest teeth in the multi-level pinion configuration are preferably arranged radially self-supportingly in front of the radially outer side of the transmission body. A housing may extend radially inward of the at least two pinions and secure them to prevent axial movement.

[0054] To axially secure the multi-layer pinion configuration, the housing may have a groove at its axial outer end, which is suitable for accommodating a locking element, for example, in the form of a ring. After the third type of transmission is assembled, the locking element can be accommodated in the groove and engage with a groove in the multi-layer pinion configuration, preferably with the groove in the pinion with the fewest teeth.

[0055] Furthermore, after installation, the outer axial end of the multi-layer pinion configuration, preferably the outer surface of the pinion with the fewest teeth, is flush with the axial end of the housing. Alternatively, the axial end of the housing extends out of the multi-layer pinion configuration by a maximum of 0.9 mm.

[0056] To implement torque transmission from a multi-pinion configuration to a third type of transmission, the transmission body may have a transmission member profile on its outer peripheral surface adjacent to the transmission stop. The transmission member profile can engage with the complementary profile of the multi-pinion configuration. For example, the transmission member profile may be constructed such that it only engages with the complementary profile of the largest pinion in the multi-pinion configuration. The transmission member profile may include 8, 9, or 22 transmission member protrusions / splines, with 9 or more splines being preferred.

[0057] The housing can be arranged radially outside the transmission body. The housing can have a different cylindrical geometry than the transmission body and taper axially outwards at one end. Therefore, particularly in the region adjacent to a smaller pinion, the radial dimension of the housing should be as small as possible to allow the smaller pinion to be arranged in that region. The inner or outer diameter of the housing can gradually taper in the region between its internal thread and its protruding axially outward end.

[0058] In one embodiment, the housing is provided with a thermoplastic material, such as polyoxymethylene (POM), or an elastomer in one region. The thermoplastic or elastomer can be injection-molded onto the housing, for example, as a locating element. The region provided with the plastic or elastomer can be used to position the housing relative to the transmission body in the axial and radial directions. After the transmission is installed, the locating element can be located at the interface between the housing and the transmission body (i.e., the area of ​​the transmission body interface), and at the interface between the transmission body and the multi-pinion gear configuration (i.e., the area of ​​the multi-pinion gear configuration interface). The locating element can circumferentially cover these two interfaces and abut against both the outer and inner circumferential surfaces of the housing.

[0059] The housing interface is preferably arranged radially further inward than the multi-layer pinion configuration interface. Axial misalignment may exist between the interfaces. The advantage is that manufacturing tolerances of the thermoplastic or elastomer do not act equally on the two interfaces. Specifically, the interfaces are spatially separated in this way, thus achieving a degree of decoupling.

[0060] In order to mount the housing onto the transmission body, the housing may have a tool interface on its radial inner surface, preferably on its axial outer end.

[0061] In the event of a bicycle malfunction, the chain may detach from the pinion and move towards the smallest pinion in a multi-pinion configuration. In adverse situations, the chain may become trapped between the housing and the rear fork end of the frame during operation, making it difficult to release from this clamp. To prevent this, multi-component drivetrains may include a chain detachment protection device, which is secured to, or can be secured to, the housing or multi-pinion configuration. The chain detachment protection device may have a radially outwardly extending portion. The radially outer surface of the extending portion of the chain detachment protection device may be an inclined surface that, after installation, slopes downward towards the smallest pinion.

[0062] After installation, the outer diameter of the protruding portion can be smaller than the outer diameter of the pinion with the fewest teeth. To secure the chain slippage protection device, it can include resilient fastening elements adapted to radially engage with the housing or a multi-tiered pinion configuration. The resilient retaining element of the chain slippage protection device can, for example, engage with a tool interface within the housing. It should be noted that the third type of drivetrain is designed with the distance defined above such that sufficient structural space remains for the third type of drivetrain when it is applied to the rear wheel assembly.

[0063] According to the foregoing embodiments, all the aforementioned transmission component profiles include the outline of so-called transmission component protrusions or splines on their outer periphery. A spline specifically refers to a wedge-shaped protrusion on the outer peripheral surface of the corresponding transmission device. The spline may extend primarily axially. Preferably, the number of splines is less than 10, more preferably less than 9. Splines may have different dimensions in their height and / or width and / or length.

[0064] Application of the multi-layer pinion configuration of the present invention in the rear wheel assembly

[0065] According to another aspect, the present invention relates to a rear wheel assembly for a bicycle having a chain-driven shift mechanism, the rear wheel assembly including a rear wheel hub that can be arranged between two opposing frame sections of the bicycle frame, a drive mechanism rotatably mounted on the rear wheel hub, and a multi-layer pinion configuration anti-rotationally coupled to or capable of anti-rotationally coupling to the drive mechanism according to one of the foregoing aspects of the invention.

[0066] According to existing technology, hub caps are used to set the axial rear wheel hub clearance. According to the present invention, the rear wheel assembly can also have such a hub cap, which is arranged axially adjacent to the drivetrain after the rear wheel assembly is assembled on the rear wheel hub. Furthermore, the rear wheel assembly may include another hub cap arranged adjacent to the frame section away from the drivetrain on the rear wheel hub. The distance between the axially outer ends of these hub caps, that is, between the two axially opposite ends of the hub caps, can be at least 142 mm, preferably at least 148 mm, and more preferably at least 157 mm. This distance between the hub caps is also referred to as the mounting width. That is, if mounting width is mentioned in this invention, it refers to the distance between the hub caps.

[0067] When the rear wheel assembly includes a transmission of the first type, the third distance between the transmission stop and the axial outer end of the hub end cap can be greater than 42.5 mm, preferably 44.1 + 1.0 / - 0.3 mm. In an alternative embodiment, when the rear wheel assembly includes a transmission of the second type, this third distance can be greater than 38.1 mm, preferably 39.7 + / - 0.2 mm. In another alternative embodiment, when the rear wheel assembly includes a transmission of the third type, this third distance can be greater than 42.5 mm, preferably 44.1 + 1.0 / - 0.2 mm.

[0068] The rear wheel assembly and bicycle frame of the present invention

[0069] Another aspect of the invention relates to a rear wheel assembly and a bicycle frame for a bicycle having a chain-driven shift mechanism. The rear wheel assembly includes a rear wheel hub disposed between two opposing frame sections of the bicycle, a drivetrain rotatably mounted on the rear wheel hub, and a multi-layered pinion configuration having at least 11 pinions of varying tooth numbers that is anti-rotatably coupled to or can be anti-rotatably coupled to the drivetrain.

[0070] Each pinion has an inner and an outer surface within its tooth region, as well as a pinion center plane located between the inner and outer surfaces and orthogonal to the rear hub. The definitions of the surfaces and planes mentioned are given above.

[0071] When the rear wheel assembly includes a drivetrain of the first drivetrain type, after the rear wheel assembly is assembled on the bicycle frame, the fourth distance axially from the outer side of the pinion with the fewest teeth to the circumferential surface on the rear fork end of the bicycle frame (the circumferential surface adjacent to and closest to the rear wheel assembly) is less than 8.2 mm, preferably 7.2 + / - 0.2 mm. If the rear wheel assembly includes a drivetrain of the second drivetrain type, this fourth distance is less than 8.7 mm, preferably 7.7 + / - 0.2 mm. If the rear wheel assembly includes a drivetrain of the third drivetrain type, this fourth distance is less than 8.35 mm, preferably 7.35 + / - 0.15 mm. For the aforementioned drivetrain, the above distances enable efficient utilization of the available mounting width of the rear wheel assembly.

[0072] As an alternative or supplementary solution, according to one aspect of the invention, when the rear wheel assembly includes a transmission of the first drivetrain type, after the rear wheel assembly is assembled with the bicycle frame, the fifth distance in the axial direction from the outer side of the pinion with the fewest teeth to the recessed surface on the rear fork end of the bicycle frame (the surface being adjacent to the rear wheel assembly and orthogonal to the rear wheel hub) is less than 12.2 mm, preferably 11.2 + / - 0.2 mm. If the rear wheel assembly includes a transmission of the second drivetrain type, then this fifth distance is less than 12.7 mm, preferably 11.7 + / - 0.2 mm. If the rear wheel assembly includes a transmission of the third drivetrain type, then this fifth distance is less than 11.5 mm, preferably 10.55 + / - 0.15 mm.

[0073] The aforementioned fourth and fifth distances achieve optimal utilization of the available structural space (installation width) for the rear wheel assembly. To this end, the multi-layer pinion configuration is axially displaced as far outward as possible, thus bringing it closer to the frame fork end. Of course, if the bicycle's drive chainring or sprocket is arranged accordingly, chain skew can also be reduced.

[0074] According to an improved embodiment of the present invention, after the rear wheel assembly is assembled with the bicycle frame, a sixth distance is defined between the outer surface of the pinion with the smallest number of teeth and the hub end cap. The spatial coefficient formed by the quotient of the fifth distance and the sixth distance is less than 3 and greater than 2.2, preferably between 2.7 and 2.4, and more preferably 2.5. The sixth distance is, for example, 4.2 mm + / - 0.2 mm.

[0075] Furthermore, a derailleur hanger can be installed on the rear fork end of the bicycle frame, or the derailleur hanger can be mounted on the rear fork end of the bicycle frame. The derailleur hanger is used to protect the rear shift mechanism and frame from damage in situations where the rear shift mechanism is under stress, such as during a fall. In an improved embodiment of the invention, after the rear wheel assembly is assembled with the bicycle frame, the derailleur hanger mounted on the fork end of the bicycle frame contacts the hub end cap and is held in a position where the rear wheel axle can be guided through the derailleur hanger and the rear wheel hub. The derailleur hanger can also have a structure that serves as a positioning aid for the rear wheel hub.

[0076] Method for installing rear wheel assembly

[0077] The present invention also relates to a method for installing a rear wheel assembly. This method may include the following steps: connecting at least two pinions with the fewest teeth in a multi-layer pinion configuration together; connecting the at least two connected pinions to a auger such that the at least two pinions are supported in a manner rotatable about the central axis of the auger; fastening the auger to the transmission by engaging the external thread of the auger with the internal thread of the transmission; aligning the two connected pinions with the pinion with the largest number of teeth connected to the transmission; and fixing the two aligned and connected pinions to the pinion connected to the transmission by a fastening member.

[0078] The multi-layer pinion configuration and all features of the rear wheel assembly in the foregoing aspects and embodiments can be combined. Attached Figure Description

[0079] The exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Wherein:

[0080] Figure 1 A perspective view of a rear wheel assembly arranged between two frame sections and a rear shift mechanism arranged on one of these frame sections, according to an embodiment of the present invention.

[0081] Figure 2a -b is a corresponding cross-sectional view of a rear wheel assembly according to an embodiment of the present invention, the rear wheel assembly being fastened to a rear wheel hub arranged between two frame sections;

[0082] Figure 3 This is a rear view of the rear wheel assembly, including a multi-layer pinion configuration and a first type of transmission device according to a first embodiment of the present invention;

[0083] Figure 4a -b is Figure 3 The side view shown is of the rear wheel assembly fastened to the frame. Figure 4a )as well as Figure 3 The side view of the transmission hanger shown ( Figure 4b );

[0084] Figure 5a -c is the cross-section of the first type of transmission device of the rear wheel assembly. Figure 5a ), front view ( Figure 5b ) and perspective ( Figure 5c The transmission device can be coupled with a multi-layer pinion configuration according to a first embodiment of the present invention;

[0085] Figure 6 for Figure 3 A cross-sectional view of the rear wheel assembly shown;

[0086] Figure 7a -b is a cross-sectional view of the rear wheel assembly, including a multi-layer pinion configuration and a second type of transmission device according to a second embodiment of the present invention;

[0087] Figure 8a -b is a side view of the second type of transmission device of the rear wheel assembly. Figure 8a ) and the front view of the rear wheel assembly ( Figure 8b );

[0088] Figure 9 For mounting on the fork end of the frame Figure 7a An enlarged view of the rear wheel assembly shown;

[0089] Figure 10 This is a cross-sectional view of the rear wheel assembly, including a multi-layer pinion configuration and a third type of transmission device according to a third embodiment of the present invention.

[0090] Figure 11a -b is a cross-sectional view of the rear wheel assembly, including a multi-layer pinion configuration and a third type of transmission device according to a third embodiment of the present invention. Figure 11a ), and a magnified portion of the rear wheel assembly ( Figure 11b );

[0091] Figure 12a -b is a cross-sectional view of the rear wheel assembly, including a multi-layer pinion configuration and a third type of transmission device according to a third embodiment of the present invention. Figure 12a ), and a magnified portion of the rear wheel assembly ( Figure 12b );

[0092] Figure 13a -d is a perspective view of the housing of the third type of transmission device. Figure 13a ) and front view ( Figure 13b ), and along Figure 13b Two different sectional views of the section line shown. Figure 13c and Figure 13b );

[0093] Figure 14a -b is the rear wheel assembly, wherein the multi-layer pinion configuration according to the fourth embodiment of the present invention is mounted on the third type of transmission device. Figure 14a ), and a magnified portion of the rear wheel assembly ( Figure 14b );

[0094] Figure 15a -b is a perspective view of the chain detachment protection device. Figure 15a ), and the cross-section of the chain detachment protection device along with the pinion mounted thereon ( Figure 15b ). Detailed Implementation

[0095] Figure 1 A perspective view of the rear wheel assembly 10 arranged between two frame sections 12, 14 is shown, wherein the rear shift mechanism 1, arranged on one of the frame sections 14, engages with the bicycle chain 5. A B-knuckle 6 for securing the rear shift mechanism 1 loops around the fork end 18 of the frame section 14 and is secured to this fork end by means of a connector shaft, which is received in both the fork end 18 and the fork end of the other frame section 12. A P-knuckle 9 is rotatably mounted on the B-knuckle 6, wherein deflection of the P-knuckle 9 changes at least its axial position relative to the B-knuckle 6.

[0096] The rear wheel assembly 10 includes a transmission 16 (not shown) and a multi-tiered pinion configuration 26. For clarity, Figure 1 The pinions of the multi-layered pinion configuration 26 are shown schematically only by indicating the corresponding outer periphery of the pinion. Figure 1 In this configuration, the bicycle chain 5, driven by a front drive pinion (not shown), engages with the pinions of the multi-layer pinion configuration 26 and the two chain rollers 8 of the rear shift mechanism 1. Of course, deflection of the rear shift mechanism 1 (especially deflection of the P-steering knuckle 9) changes the position of the bicycle chain 5 relative to the pinions, allowing the bicycle chain 5 to engage with the next adjacent pinion or the pinion after that.

[0097] General description of the accompanying drawings

[0098] The accompanying drawings illustrate rear wheel assemblies 10, 100, and 1000 with different embodiments of multi-layer pinion configurations 26; 126; 1026, suitable for bicycles with chain-driven shifting. Each rear wheel assembly 10, 100, and 1000 includes a rear wheel hub 17; 1017 (see also...) that can be arranged between two opposing frame sections 12, 112, 1012; 14, 114, 1014. Figure 2a -b、 Figure 11a -b) and drivetrain 16, 116, 1016 rotatably mounted on the rear wheel hub. The drivetrain is arranged between frame sections 14, 114, 1014, preferably their fork ends 18, 118, 1018 and the bicycle center planes 20, 120, 1020. To determine the bicycle center planes 20, 120, 1020, these two frame sections 12, 112, 1012; 14, 114, 1014 are used as reference points, with the bicycle center planes 20, 120, 1020 centered between these reference points and extending orthogonally to the rear wheel hubs 17, 1017, such as the axis of rotation or longitudinal axis of the rear wheel hub. Rear wheel axles 15, 115, 1015 are guided through the rear wheel hubs 17, 1017 to secure the rear wheel hub to the bicycle frame. Rear wheel axles 15, 115, and 1015 are plug-in shafts suitable for multi-layer pinion configurations with more than 11 pinions.

[0099] The axial direction used in this application refers to the bicycle's center planes 20, 120, 1020 and frame sections 14, 114, 1014. The inward direction of the axial direction is A. i It is defined as the direction toward the bicycle's center plane 20, 120, 1020, while the axial outward direction A a It is defined as the direction toward frame sections 14, 114, and 1014. Therefore, the axial direction A i and A a They are opposite to each other. And if we mention the radially outward direction R... a This refers to the direction away from the rotation axes 24, 124, and 1024 of the multi-layered pinion configuration 26, 126, and 1026. The radially inward direction R... i Radial outward direction R a Conversely, the direction is towards the rotation axes 24, 124, 1024 of the multi-layer pinion configuration 26, 126, 1026. The rotation axes 24, 124, 1024 of the multi-layer pinion configuration 26, 126, 1026 are parallel to the rear wheel hubs 17, 1017 and coincide with the rotation axis or longitudinal axis of the rear wheel hubs 17, 1017.

[0100] Furthermore, each of the rear wheel assemblies 10, 100, and 1000 shown in the attached figures has a multi-layered pinion configuration 26, 126, and 1026 with at least 11 pinions R1-R11, coupled or coupled to the transmission devices 16, 116, and 1016, respectively. These pinions have different numbers of teeth. Each pinion has inner surfaces 28, 128, and 1028 and outer surfaces 30, 130, and 1030 within its tooth region, as well as pinion center planes 31, 131, and 1031 located between the inner surfaces 28, 128, and 1028 and the outer surfaces 30, 130, and 1030 and orthogonal to the rear wheel hub. The outer surfaces 28 of the three pinions with the smallest number of teeth are, for example, located on... Figure 4a Visible in the side view. Best as Figure 7b As shown, the central planes 31, 131, and 1031 of the pinions can extend through the center of the corresponding pinions, that is, they are centrally defined between the inner surfaces 28, 128, and 1028 and the outer surfaces 30, 130, and 1030.

[0101] Figure 2a -b combines two multi-layer pinion configurations 26 with different construction methods to show a multi-layer pinion configuration 26 with twelve pinions R1-R12. Figure 2a A multi-layer pinion configuration 26 is shown, in which the four largest pinions R1-R4 are connected to a star gear 13, thereby transmitting torque to the transmission 16 via the star gear 13. In this space-saving embodiment, the four largest pinions are radially spaced from the transmission 16. Six medium pinions R4-R9 are axially spaced from the spacer segments 27 and directly engage with the transmission 16 in a torque-transmitting manner. The two smallest pinions R11 and R12 are connected to the transmission 16 via a third smallest pinion R10 through a helical plug 46 in a torque-transmitting manner.

[0102] Figure 2b An alternative multi-layer pinion configuration 26 is shown, in which the pinions are connected by pins / bolts 19. Only the largest pinion R1 is connected to the transmission 16 in a torque-transmitting manner, i.e., extends to the transmission 16. The remaining pinions R2-R12 are radially spaced from the transmission 16. The three smallest pinions are integrally formed, for example, welded together, and are connected to the transmission 16 in a torque-transmitting manner via a third smallest pinion R10, and are axially secured by a helical plug 46.

[0103] also, Figure 2a -b indicates the mounting width D0 that can be used for the components to be fastened to the rear wheel hub 17, which is at least 142 mm. The mounting width refers to the distance between the outer side 7 of the left wheel hub end cap 3 adjacent to the frame section 12 and the outer side 4 of the right wheel hub end cap 2 adjacent to the frame section 14.

[0104] First Embodiment

[0105] Figures 2, 3, and 6 illustrate a rear wheel assembly 10 having a multi-layer pinion configuration according to a first embodiment of the invention. The rear wheel assembly 10 includes a transmission device hereinafter referred to as a first-type transmission device 16, which, due to its widespread use, is also known in the professional field as a "standard transmission device." Figure 5a In -c, the first type of transmission device 16 is a separate component marked with selected characteristic dimensions. This component has a transmission profile 32 that rises radially outward from the base surface 34 on its outer peripheral surface. The transmission profile 32 may include transmission protrusions or so-called splines. At least one of the splines 32' has a different dimension than the remaining splines of the profile 32. The pinion to be fastened to the transmission device 16 typically has an inner profile that is complementary to the transmission profile 32 of the transmission device 16. Thus, the pinion with the corresponding inner profile engages with the transmission device 16 in a torque-transmitting manner.

[0106] For example, the transmission device 16 may have a transmission member profile on a first region of its radially outer surface, which extends axially outward from the transmission device stop portion 40 along a first axial length L1. a The extension is as follows. For all embodiments, a section of the transmission devices 16, 116, and 1016 is generally referred to as the transmission device stop. The multi-layer pinion configurations 26, 126, and 1026, fastened to the transmission devices, are stopped in this section, and the position of the multi-layer pinion configurations 26, 126, and 1026 relative to the transmission devices 16, 116, and 1016 can be determined by this section. The first axial length L1 of this first type of transmission device is preferably greater than 32.9 mm, preferably 33.2 + / - 0.2 mm. The outer diameter d1 measured on the radial outer surface of the transmission member contours 32, 32' within this first region is preferably greater than 34.2 mm, preferably 34.5 + / - 0.15 mm.

[0107] like Figure 5a As shown in -c, a first region with the transmission member contour 32 is connected to a relatively short second region in which the radially outer surface of the transmission device 16 does not have the transmission member contour and is therefore smooth. The second axial length L2 of the transmission device 16 extends from the transmission device stop portion 40 to the axially outer end side 42 of the transmission device 16 and is 34.5 mm to 35.9 mm, but preferably 34.9 + / - 0.3 mm. The outer diameter d2 of the second region can be greater than 31.4 mm, and preferably 32.1 + / - 0.2 mm.

[0108] Furthermore, the transmission device 16 has an internal thread 38 facing radially inward adjacent to its axial outer end 40. The internal thread 38 preferably has a nominal diameter d3 of less than 29.8 mm, and more preferably about 30.6 mm. The preferred pitch of the internal thread of the transmission device is 24 TPI, such that, according to known dimensioning, the thread can be characterized as M 30.6 × 24 TPI.

[0109] like Figure 6 As shown, in the rear wheel assembly 10, multiple pinions of the multi-layer pinion configuration 26 can be installed not only in the outer peripheral region of the first type of transmission device 16, but also axially outside the first type of transmission device 16, that is, axially in front of the transmission device 16. Thus, as... Figure 6 The diagram shows a first distance D1 along the axial direction from the transmission stop 40 to the outer surface 28 of the smallest pinion R12, which is greater than 38.0 mm. Of course, if this first distance D1 is as large as possible, for example greater than 39.1 mm or better, 39.9 + / - 0.2 mm, the available mounting width can be optimally utilized to arrange as many pinions as possible.

[0110] exist Figure 6 In the illustrated embodiment, the two pinions R12 and R11 with the smallest number of teeth are arranged axially in front of the first type of transmission device 16. The inner diameter of these two pinions is smaller than the outer diameter of the transmission device 16. Furthermore, the inner diameter of the smaller pinions R12 and R11 is also smaller than the nominal diameter d3 of the internal thread of the transmission device 16. These two pinions R12 and R11, arranged outside the transmission device 16, create a second axial distance D2 from the outer axial end 42 of the first type of transmission device 16 to the outer surface 28 of the pinion R12 with the smallest number of teeth. This second distance D2 is greater than 4.0 mm, preferably 5.0 + / - 0.2 mm.

[0111] The two pinions R12, R11, positioned before or axially outside the first type of transmission 16, are radially self-supporting but connected to another pinion R10 in the multi-layer pinion configuration 26. That is, the self-supporting pinions R12, R11 are not supported on their radial inner circumference but are connected to the radially supported pinion R10 on the first type of transmission, which engages with the transmission profile 32 on the outer circumference of the first type of transmission 16. To connect the two self-supporting smallest pinions R12, R11 to each other and to connect these pinions to adjacent pinions R10 fastened to the transmission 16, connecting members 44 are provided, extending between the pinions and parallel to the rear hub or parallel to the rotation axis 24 of the multi-layer pinion configuration 26. Figure 6As shown, the connecting member 44 is installed within the area of ​​the root circle of the pinion. The connecting member 44 may refer to a flange or other annular fastening element. Alternatively, a retaining bolt connected to two adjacent pinions may be used as the connecting member 44.

[0112] The radially self-supporting pinions R12 and R11 are axially fixed by means of a sealing element. Figure 6 The central sealing element is constructed as a spiral plug 46, which, after installation, engages with the internal thread of the first type of transmission device 16 via external threads arranged on its outer periphery. Furthermore, Figure 6 The shown screw plug 46 has a protruding portion 48 on its axially outward-facing end side. The protruding portion 48 is adapted to abut against the end face of the smallest pinion R12 and absorb the forces applied to these pinions R12, R11 in the axial direction. Specifically, the axially outward-facing R... a The force acting on the ground is absorbed by the protrusion 48 of the closing element 46. Therefore, the closing element 46 fixes two self-supporting pinions R12, R11 in the axial direction. For space-saving arrangement, the protrusion 48 is engaged with the groove 49 of the smallest pinion R12 such that the protrusion 48 is flush with or extends out of the outer surface 28 of the smallest pinion R12 by a maximum of 2 mm, preferably 0.9 mm.

[0113] To facilitate easy screwing of the screw plug 46 into the transmission device 16, the screw plug has a tool interface 50 in the area of ​​its inner circumference.

[0114] The closure element 46 is adapted to accommodate one or both of the two smallest pinions. For this purpose, the closure element 46 has a region 47 for accommodating the pinion, which is constructed as an undercut and has a reduced outer diameter. The undercut outer diameter is smaller than the outer diameter of the first type of transmission 16. Therefore, one or more pinions accommodated in the undercut region can have an inner diameter such that, for example, a pinion with 10 teeth and a correspondingly small root circle can be accommodated. Undercut means that there exists a region whose outer circumferential surface is surrounded by two axial stops with a larger diameter.

[0115] Two self-supporting pinions R12, R11 are connected by a connecting member 44'. This can refer to a separable connection, or, for example, an engagement connection that can only be separated again by breaking. With the closing element 46 installed, the two self-supporting pinions R12, R11 can rotate about the central axis of the closing element 44'. That is, the closing element 48 can be screwed into the first type of transmission 16 regardless of the rotational orientation of the pinions R12, R11. This makes it possible to fasten the self-supporting pinions R12, R11 relative to the pinion R10 housed in the first type of transmission 16 only when the desired rotational orientation is determined.

[0116] Of course, in particular, the self-supporting pinions R12 and R11 can be housed in the undercut closure element 48 when the inner diameter of the accommodated pinions R12 and R11 is equal to or only slightly larger than the outer diameter of the undercut region 47. For this purpose, the closure element 48 can be implemented as a two-piece unit, and the self-supporting pinions R12 and R11 are connected together, for example, by means of a joint connection or a screw connection, after being arranged within the undercut region 47. Alternatively, the closure element 48 can have a resilient region, such that even when the closure element 48 has an undercut, the self-supporting pinions R12 and R11 can still be pushed towards the undercut region 47 on the resilient region by means of the resilient region. Alternatively, additive manufacturing processes, such as the 3D printing process of the present invention, can be used.

[0117] Therefore, the aforementioned rear wheel assembly 10 can transmit the torque applied to the self-supporting pinions R12 and R11 to the first type of transmission 16. For example, if the torque is applied to the smallest pinion R12 via the bicycle chain, the torque transmission from the smallest pinion R12 to the second smallest pinion R11 can be implemented via the connecting member 44' between the smallest pinion R12 and the second smallest pinion R11. The second smallest pinion R11 is also not directly connected to the first type of transmission 16; therefore, the torque is further transmitted to the first type of transmission 16 via the connecting member 44 between the second smallest pinion R11 and pinion R10, which is adjacent to and connected to the first type of transmission 16. Of course, the torque applied to the second smallest pinion R11 is also transmitted via the connecting member 44 to the pinion R10 connected to the first type of transmission 16, and thus to the first type of transmission 16.

[0118] Figure 6 A partial cross-sectional view is shown of a rear wheel assembly 10 mounted on a bicycle hub, which is housed in the fork end 18 of the frame section 14 by means of retaining screws 52. To optimally utilize the structural space, the mounting width available for the rear wheel assembly 10 is minimized by a fourth distance D4 axially from the outer surface 28 of the smallest pinion R12 to the circumferential surface 54 of the frame section 14 or the rear fork end 18 of the bicycle frame. This fourth distance D4 is, for example, less than 8.2 mm, preferably 7.2 + / - 0.2 mm. In some cases, the frame section 14 or its fork end 18 has a recessed surface 56 for accommodating a derailleur lug 58. In order to provide sufficient structural space between the frame section 14 or its fork end 18 and the rear wheel assembly 10 for mounting the transmission hanger 58, the fifth distance D5 in the axial direction from the outer side 28 of the smallest pinion R12 to the recessed surface 56 on the frame section 14 or its fork end 18 is less than 12.2 mm, and preferably about 11.2 + / - 0.2 mm.

[0119] As described above, the transmission hanger 58 is arranged in the region between the smallest pinion R12 in the axial direction and the frame section 14. The transmission hanger 58 is adapted to carry the rear shift mechanism. For this purpose, the transmission hanger is fastened to the rear axle 15 and has a through hole 62 in the first region 60, which is preferably located in... Figure 4a -b is visible and used for fastening the shift mechanism. Figure 6 The transmission hanger 58 shown also has a second region 64 arranged opposite to the first region 60. The second region 64 is connected to the rear wheel hub and in Figure 6 It has a protrusion 66 adjacent to the smallest pinion R12. Furthermore, the transmission lug 58 has... Figure 4b The wheel mounting slot 59 is shown. The wheel mounting slot 59 is defined by the offset between a first region 60 and a second region 64 of the transmission lug 58. The wheel mounting slot 59 has a width 61 of 2 mm to 3 mm, preferably 2.5 + / - 0.2 mm. The first region 60 can be made of thermoelastic plastic, and the second region 64 can be made of metal. The aforementioned embodiment of the wheel mounting slot 59 with a given width 61 can form a multi-layer pinion configuration, wherein the smallest pinion can be positioned in the furthest axial direction possible. This reduces chain skew and utilizes the mounting width particularly efficiently.

[0120] Therefore, the wheel mounting groove 59 helps to ensure that the seventh distance D7 between the outer surface 28 of the smallest pinion R12 and the protrusion 66 of the second region 64 of the transmission hanger 58 facing the pinion is at least 2.2 mm. This provides sufficient free space between the protrusion 66 of the transmission hanger 58 and the chain engaging the smallest pinion R12. However, in order to make the best use of the available structural space, the seventh distance D7 should be less than 3.2 mm.

[0121] Second Embodiment

[0122] The rear wheel assembly 100 having a multi-layer pinion configuration according to a second embodiment of the present invention will now be described. Elements that have been described in the first embodiment and are correspondingly included in the second embodiment are provided with reference numerals that are numerically increased by 100, and only technical solutions or functions different from those described above will be described below.

[0123] According to a second embodiment of the present invention, the rear wheel assembly 100 includes a second type of transmission device 116. After installation, at least two pinions R12 and R11 with the smallest number of teeth on this second type of transmission device are configured to be radially self-supporting and connected to the second type of transmission device via at least one other pinion R10 with a larger number of teeth. Figure 7bThe magnified view best shows that the arrangement of the three pinions with the fewest teeth, R12, R11, and R10, is such that the center plane 131 of the third smallest pinion, R10, extends within the region of the axial end face 142 of the second type of transmission device or axially outside the second type of transmission device. Line 200 represents the extension of the axial end face 142 of the second type of transmission device 116, illustrating the axial offset between the center plane 131 of the pinions and the axial end face 142 of the second type of transmission device 116.

[0124] The rear wheel assembly 100 also has a closure element 146, which is similar to the closure element 46 in the first embodiment. Figure 7b As shown, the sealing element, as a spiral plug 146, is equipped with an external thread for engaging with the internal thread of the second type of transmission device, and a protruding portion 148. Even if the protruding portion 148 is... Figure 7b The diagram shows the smallest pinion R12 on its axial outer side. In an alternative embodiment, the smallest pinion R12 may also have a groove in the transition area between its axial outer end side and its inner circumferential surface, into which the protruding portion 148 of the spiral plug 146 can be engaged.

[0125] exist Figure 7a In the embodiment shown in -b, the inner diameter of the pinion R12 with the smallest number of teeth is equal to the inner thread diameter (nominal diameter) of the internal thread of the second type of transmission device 116 suitable for accommodating the internal thread of the sealing element 146.

[0126] The second type of transmission device is characterized by its geometric dimensions, as detailed below. Figure 8a -b provides a detailed description of these geometric dimensions.

[0127] The second type of transmission device 116 also has transmission component outlines 132, 132' on a first region of its radially outer peripheral surface, which extend axially outward from the transmission device stop portion 140 along a first axial length L1. a The first axial length L1 is greater than 24.7 mm, preferably 25.7 + / - 0.2 mm. The outer diameter d1 measured on the radial outer surface of the transmission profiles 32, 32' within this first region is preferably greater than 31.6 mm, preferably 32.6 + 0.05 / 0.1 mm.

[0128] like Figure 8aAs shown, a first region having transmission component outlines 32, 32' is connected to a second region, in which the radial outer surface of the second type of transmission device does not have a transmission component outline. The second axial length L2 of the second type of transmission device 116 extends from the transmission device stop portion 140 to the axial outer end side 142 of the second type of transmission device 116, and is 25 mm to 27 mm, but preferably 26.0 + / - 0.2 mm. The outer diameter d2 of the second region can be greater than 31.4 mm, and preferably 29.5 + / - 0.1 mm.

[0129] The multi-layer pinion configuration 126 of the present invention also utilizes available structural space in a manner advantageous compared to the prior art, namely... Figure 2a The mounting width is shown in -b. Therefore, as mentioned above, pinions R12, R11, and R10 are axially arranged in front of the second type of transmission. A first distance D1 is generated axially from the transmission stop 140 to the outer surface 128 of the smallest pinion R12, which is greater than 34 mm, preferably 35.0 + / - 0.2 mm.

[0130] According to a second embodiment of the present invention, the second distance D2 from the outer axial end 42 of the second type of transmission device to the outer surface 128 of the pinion R12 with the smallest number of teeth is greater than 4.0 mm, preferably 5.0 + / - 0.2 mm.

[0131] Figure 9 A rear wheel assembly 100 is shown mounted on a bicycle hub, which is housed in the fork end 118 of the frame section 114 by means of retaining screws 152. To set the axial hub clearance, a hub end cap 202 is provided, which is arranged on the outer circumferential surface of the bicycle hub and radially surrounds this outer circumferential surface. After installation, the third distance D3 between the drivetrain stop 140 and the axially outward-facing end side 204 of the hub end cap 202 is greater than 38.1 mm, preferably 39.7 + / - 0.2 mm.

[0132] like Figure 2a As shown in -b, the rear wheel assembly includes another hub cap 203, which is disposed adjacent to the frame section 112 away from the drivetrain on the rear wheel hub. The hub cap distance D0 between the axially outer ends 204 and 205 of the hub cap can be at least 142 mm, preferably at least 148 mm, and more preferably at least 157 mm. For all embodiments, the hub cap distance D0 between the axially outer ends of the aforementioned hub caps is referred to as the mounting width.

[0133] To optimally utilize the structural space, i.e., the mounting width for the rear wheel assembly, the fourth distance D4 axially from the outer surface 128 of the smallest pinion R12 to the circumferential surface 154 of the frame section 114 or the rear fork end 118 of the bicycle frame is kept as small as possible. This fourth distance D4 is, for example, less than 8.7 mm, and preferably 7.7 + / - 0.2 mm. Furthermore, the fifth distance D5 axially from the outer surface 128 of the smallest pinion R12 to the recessed surface 156 on the frame section 114 or its fork end 118 is less than 12.7 mm, and preferably about 11.7 + / - 0.2 mm. Additionally, the sixth distance D6 between the outer surface 128 of the smallest pinion R12 and the radially outward-facing end side 204 of the hub end cap can be 4.7 + / - 0.2 mm.

[0134] A transmission hanger 158, corresponding to the transmission hanger 58 in the first embodiment, is arranged between the frame section 114 and the second type of transmission 116. As described with respect to the first embodiment of the invention, the transmission hanger 158 has a first region 160 including a through hole for mounting a rear shift mechanism and a second region 164 including a protrusion 166 adjacent to the smallest pinion R12. Furthermore, the transmission hanger 158 has a wheel mounting groove 59 as described in the first embodiment, with a width 61 of 2.0 mm to 3.0 mm, preferably 2.5 + / - 0.2 mm. The seventh distance D7 between the outer surface 128 of the smallest pinion R12 and the surface of the protrusion 166 of the second region 164 of the transmission hanger 158 facing this pinion can be at least 2.7 mm. This ensures sufficient free space between the protrusion 166 of the transmission hanger 158 and the chain engaging the smallest pinion R12. However, to make the best use of the available structural space, the seventh distance D7 should be less than 3.2 mm.

[0135] Third Embodiment

[0136] The rear wheel assembly 1000 according to a third embodiment of the present invention will now be described. Elements that have been described in the first or second embodiment and are correspondingly included in the third embodiment are provided with reference symbols that are numerically increased by 1000, and only technical solutions or functions different from those described above will be described below.

[0137] Figure 10-1 2. According to a third embodiment of the present invention, the multi-layer pinion configuration 1026 is coupled to or can be coupled to the third type of transmission device 116, wherein, in the coupled state, at least two pinions R12, R11 with the smallest number of teeth are configured to be self-supporting in the radial direction, and are coupled to the third type of transmission device through at least one other pinion R10 with a larger number of teeth. Figure 11bThe magnified view best shows that the three pinions with the fewest teeth, R12, R11, and R10, are arranged such that the center plane 1032 of the third smallest pinion, R10, extends axially outside the outer end face 1042 of the third type of transmission device. Furthermore, in the third type of transmission device, as indicated by reference numeral 1300 between the inner surface / inner plane 1030 of the pinion and the outer end face 1042, even the inner surface / inner plane 1030 of the third smallest pinion, R10, is arranged axially outside the outer end face 1042 of the third type of transmission device 1016.

[0138] The third type of transmission device 1016 differs from the first and second types of transmission devices 16 and 116 in that it includes a transmission device body 1302 and a receiving body 1304. The transmission device body 1302 has a transmission device stop portion 1040 and a region adjacent to this stop portion, the region having external threads 1306 on its outer circumferential surface. The receiving body 1304 has internal threads 1308 on its inner circumferential surface, which are adapted to engage with the external threads 1306 of the transmission device body 1302 after the third type of transmission device 1016 is assembled.

[0139] After the multi-layer pinion configuration with the third type of transmission device is installed, the accommodating body 1304 stops at its axial inner end on the largest pinion R1 of the multi-layer pinion configuration 1026, so that the largest pinion R101 stops both on the transmission device stop portion 1040 of the transmission device body 1302 and on the accommodating body 1304. At the opposite axial outer ends of the accommodating body 1304, the accommodating body 1304 extends axially outward from its axial outer end 1309. a The housing 1304 extends from the transmission body 1302. Therefore, the housing 1304 can also axially fix the pinion arranged outside the transmission body 1302, as will be explained in more detail below. For this purpose, the housing 1304 includes a locking element 1310 adjacent to its axially outer end, which axially fixes the multi-layered pinion arrangement 1026, thereby preventing axial movement of the pinion. Furthermore, as... Figure 10 As shown in Figure 11, the receiving body 1310 engages with the groove 1049 of the smallest pinion R12 using a locking element 1310. The locking element 1310 can be a locking ring 1310, which is received in a groove 1312 near the axially outer end of the receiving body 1304. That is, the locking element 1310 can be detachably connected to the receiving body 1304.

[0140] Even if the accommodating body 1304 is not referred to as a closing element, this accommodating body can perform the function of such a closing element, such as axial fixation of a pinion.

[0141] like Figure 11b As shown, if the locking element 1310 engages with the groove 1049 of the smallest pinion R12, then the axial outer end 1315 of the smallest pinion R12 is flush with the axial outer end 1316 of the receiving body 1304. In an alternative embodiment, the axial outer end 1316 of the receiving body 1304 extends slightly from the outer surface 1028 of the smallest pinion R12, but by a maximum of 0.9 mm. Therefore, the locking element 1310 can certainly be arranged in the groove 1049 of the smallest pinion R12. That is, the locking element 1310 is axially inward A i The ground is offset from the outer surface 1028 of the smallest pinion R12.

[0142] The inner diameter of the outer axial end 1309 of the accommodating body 1304 is smaller than the outer diameter of the transmission body 1302. Therefore, small gears R12 and R11, whose inner diameter is smaller than the outer diameter of the transmission body 1302, can be accommodated in the outer axial direction of the transmission body 1302.

[0143] Figure 10 The distances already described in the above embodiments are shown. The first axial distance D1 from the transmission stop 1040 to the outer surface 1028 of the pinion R12 with the fewest teeth can be greater than 37.4 mm. The first distance D1 can also be greater than 38.0 mm, and is even more preferably 39.9 mm. The second axial distance D2 from the outer end 1042 of the transmission body 1302 to the outer surface 1028 of the pinion R12 with the fewest teeth can be less than 9.1 mm, and is preferably 7.1 + / - 0.12 mm.

[0144] Furthermore, the rear wheel assembly 1000 includes a hub cap 1202, which stops both on the bearing of the drivetrain 1016 and on the derailleur hanger 1058. After the rear wheel assembly 1000 is assembled with the bicycle frame, the third distance D3 between the drivetrain stop 1040 and the radially outer end 1204 of the hub cap 1202 can be greater than 42.5 mm. The third distance D3 is further preferably about 44.1 + 1.0 / - 0.3 mm. The fourth distance D4 between the outer surface 1028 of the smallest pinion R12 and the circumferential surface of the frame section 1014 or its fork end 1018 can be greater than 8.35 mm. To efficiently utilize the structural space or the structural space available for the rear wheel assembly 1000, the fourth distance D4 is preferably 7.35 + / - 0.15 mm. The fifth distance D5, extending axially from the outer surface 1028 of the pinion R12 with the fewest teeth to the recessed surface 1056 on the rear fork end 1018 of the bicycle frame, can be less than 11.5 mm. However, for particularly efficient use of structural space, the fifth distance D5 is preferably 10.5 + / - 0.15 mm. Furthermore, the sixth distance D6 between the outer surface 1028 of the pinion R12 with the fewest teeth and the radially outward-facing end side 1204 of the hub end cap can be 4.7 + / - 0.2 mm.

[0145] The transmission hanger 1058 corresponds to the transmission hanger 58 described in the first embodiment. The seventh distance D7 between the outer surface 1028 of the smallest pinion R12 and the axial inner surface of the protrusion 1066 of the transmission hanger 1058 is, for example, 2.35 mm. Furthermore, the position of the rear wheel assembly according to the third embodiment of the present invention can be characterized by an eighth distance D8 between the outer surface 1028 of the smallest pinion R12 and the axial outer surface of the metal portion 1312 of the transmission hanger 1058. The eighth distance D8 is, for example, 9.35 mm. Here, it is assumed that the transmission hanger 1058 with the metal portion 1312 is used, for example... Figure 4b The transmission hanger shown. This metal portion 1312 is encapsulated in plastic injection molding within the second region 1064 of the transmission hanger 1058. The second region 1064 and its protrusion 1066 are, for example, formed of plastic. The first region 1060 for accommodating the rear shift mechanism and the region for mounting to the rear wheel hub 1017 can, for example, be metal.

[0146] Furthermore, the ninth distance D9 from the transmission stop portion 1040 to the recessed surface 1056 on the rear fork end 1018 is, for example, 51.1 mm.

[0147] The torque, i.e., the torque applied to the pinions R2-R12 of the multi-layer pinion configuration 1026, is transmitted to the largest pinion R1 via the connected pinions 1026. For this purpose, for example, all the pinions in the multi-layer pinion configuration 1026 are connected in a torque-transmitting manner. For example, all the pinions except the largest pinion R1 are integrally connected. In principle, the multi-layer pinion configuration 1026 can be fabricated using 3D printing. Alternatively, the connection can be formed by connecting elements such as flanges or retaining bolts. Furthermore, the pinions can also be integrally linked. To transmit torque from the largest pinion R1 to the third type of transmission 1016, the transmission body 1302 has a transmission profile 1032 on its outer peripheral surface adjacent to the axial inner end face of the transmission body 1302, and the complementary transmission profile on the inner peripheral surface of the largest pinion R1 engages with this transmission profile in a torque-transmitting manner. Furthermore, the largest pinion R1 is radially supported on the transmission body 1302 within the region 1314 where the transmission profile 1032 is arranged.

[0148] Figure 12a -b illustrates a rear wheel assembly 1000 with the multi-layer pinion configuration 1026 of the present invention, mounted on a bicycle frame. Figure 12a In the example of the rear wheel assembly 1000 shown in -b, the rear shift mechanism is coaxially mounted on the rear fork end 1018 of the frame section 1014 with the rotation shaft 1024 by means of a structural element 1006, also referred to as the B steering knuckle 1006. That is, according to the fourth embodiment of the invention, no gearshift lug is provided for mounting the rear shift mechanism; rather, the structural element 1006 carrying the rear shift mechanism is fastened to the frame section 1014 by the rear wheel axle 1015, which is constructed as a plug-in shaft.

[0149] The following reference Figure 13a -d provides a detailed description of the housing 1304 of the third type of transmission device 1016.

[0150] Figure 13a -d shows a housing 1304 with an axially outward end 1309, which extends radially outward in the axial direction after the third type of transmission device is assembled. a The transmission device body 1302 extends outwards. Furthermore, in... Figure 13c and 13d In the cross-sectional views AA and BB, the internal thread 1308 can be seen, which can be engaged with the external thread of the transmission body 1302. In the middle region 1318 of the transmission body 1302, the transmission body 1302 gradually becomes tapered axially outward between the internal thread 1308 and the axial outer end 1309.

[0151] In addition, Figure 13a , 13cThe slot 1312 can be seen in -d, and the locking element 1310 can be engaged in the slot to axially fix the multi-layer pinion configuration 1026. The locking element 1310 can also be defined as part of the transmission device 1302 or part of the housing 1304.

[0152] like Figure 13a As shown, the accommodating body 1304 has through holes 1320 distributed around its periphery. The through holes 1320 are arranged within an intermediate region 1318 and adjacent to the axially outer end 1309 of the accommodating body 1304. The through holes are adapted to accommodate thermoplastics such as POM or elastomers in a manner that allows thermoplastics such as POM or elastomers to pass through the through holes 1320 and extend along the regions connected in the radial outer and radial inner directions. Figure 13c The cross-section AA of the accommodating body 1304 is shown in a region in which no through holes are provided and thermoplastic or elastomer 1322 is located radially outside and radially inside the accommodating body 1304. Figure 13d The cross-sectional view BB shows the form of the thermoplastic or elastomer 1322 within the region of the through-hole 1320. The region formed by the thermoplastic or elastomer can also be referred to as the positioning body 1322. The positioning body 1322 can be injected around the receiving body 1304 during the injection molding process.

[0153] The positioning body 1322 forms interfaces 1324 and 1326 for the transmission body 1302 and the multi-layer pinion configuration 1026. Figure 14 shows the transmission body interface 1324, which is the abutment of the radially inner region of the accommodating body 1304 on the transmission body 1304. Figure 14 also shows the multi-layer pinion configuration interface 1326, which is the abutment of the radially outer region of the accommodating body 1304 on the multi-layer pinion configuration 1026. These two interfaces 1324 and 1326 are radially offset, with the transmission body interface 1324 preferably arranged more axially than the multi-layer pinion configuration interface 1326. In an alternative embodiment (not shown), interfaces 1324 and 1326 overlap radially.

[0154] The positioning body 1322 can support the multi-layer pinion configuration 1026 radially and axially on the transmission body 1302. In Figure 14, the third smallest pinion R10 is radially supported on the receiving body 1304, while the two smallest pinions R12 and R11 are implemented as self-supporting.

[0155] The accommodating body 1304 has a tool interface 1323 on the inner circumferential surface of its axial outer end 1309. A tool can be inserted into this tool interface, and the accommodating body can be rotated such that its internal thread 1308 engages with the external thread 1306 of the transmission body 1302, thereby fixing the two together.

[0156] Figure 15a -b shows a chain derailment protection device 1326, which is fastened to a housing 1304 in the figure. Alternatively, the chain derailment protection device 1326 may also be fastened to a multi-pinion configuration 1026, but this is not shown. The chain derailment protection device 1326 includes: a retaining element 1328 for engaging with the housing 1304 or the multi-pinion configuration 1026; and a radially outwardly extending portion 1330. The radially outer surface 1332 of the extending portion of the chain derailment protection device 1326 is constructed as an inclined surface, such as... Figure 15a As shown, after installation, the surface slopes downward toward the pinion R12 with the fewest teeth. After installation, the outer diameter of the protruding portion 1326 is smaller than the outer diameter of the pinion with the fewest teeth.

[0157] To secure the chain derailment protection device 1326, the retaining element 1328 is constructed to be flexible and adapted to engage with the housing 1304 or the multi-tiered pinion configuration 1026. The housing 1304 engages in the region of its axially outer end 1309. The retaining element of the chain derailment protection device can, for example, engage with the tool interface 1323 of the housing 1304.

[0158] Even though the foregoing embodiments pertain to a multi-layer pinion configuration with 12 pinions, the present invention can also be applied to multi-layer pinion configurations with other numbers of teeth, such as 11 or 13 pinions. In the case of 11 pinions, the two smallest pinions are denoted as R11 and R10 in the present invention notation, and the third smallest pinion is denoted as R9. The largest pinion can be referred to as R1 regardless of the total number of pinions. Similarly, in the case of 13 pinions, the two smallest pinions are denoted as R13 and R12 in the present invention notation, and the third smallest pinion is denoted as R11. The smallest pinion can have 10 or fewer teeth regardless of the total number of pinions.

[0159] In this application, when referring to the smallest or largest pinion, this statement means the pinion with the smallest number of teeth or the pinion with the largest number of teeth. Of course, the second smallest or third smallest pinion refers to the pinion with the second smallest or third smallest number of teeth.

[0160] The arrangement of at least two self-supporting pinions allows the use of pinions with a root circle smaller than the outer diameter of the transmission. This multi-layered pinion configuration can thus include, for example, pinions with fewer than 10 teeth.

[0161] Furthermore, the pinion positioned axially in front of the drivetrain allows for optimal utilization of the mounting width between the fork ends of the bicycle frame, which is available for mounting the drivetrain and the multi-pinion configuration. This not only allows multiple pinions to be mounted on or in front of the drivetrain, but also enables the entire multi-pinion configuration to be further displaced axially outward. This displacement reduces undesirable chain misalignment between the front drive pinion and the rear multi-pinion configuration pinions. This is particularly advantageous when using only a single front drive pinion. In other words, reduced chain misalignment improves overall drivetrain efficiency and reduces chain wear. Additionally, chain noise that is uncomfortable for the rider is reduced.

[0162] A space-saving and material-saving design for the rear wheel assembly is achieved through an implementation where at least two pinions are radially self-supporting. This indicates that the drivetrain preferably does not require additional retaining elements to radially support the pinions arranged axially in front of the drivetrain. The connection between the self-supporting pinions and another pinion with a larger number of teeth is used to fully transmit the torque generated during bicycle operation to the drivetrain and then to the rear wheel hub. This larger pinion is itself coupled to the drivetrain or can be coupled to the drivetrain. Of course, the material-saving design without additional retaining elements also contributes to a reduction in drivetrain weight.

[0163] If the three pinions with the fewest teeth are arranged such that the center plane of the third smallest pinion in the multi-layer pinion configuration extends within the axial end face of the transmission device or axially outside the transmission device, the mounting width available for the rear wheel hub can be utilized particularly efficiently. Compared to known solutions in the prior art, the solution of the present invention can increase the mounting width available for arranging the multi-layer pinion configuration by up to 2.5 mm.

Claims

1. A multi-level pinion configuration for a rear wheel assembly of a bicycle having a chain-driven shift mechanism, wherein the multi-level pinion configuration has a rotating shaft and is adapted to be anti-rotationally coupled to a transmission of the rear wheel assembly, wherein the multi-level pinion configuration comprises: At least 11 small gears with different numbers of teeth, Each pinion has an inner surface and an outer surface within its tooth region, as well as a pinion center plane located between the inner and outer surfaces and orthogonal to the axis of rotation. The multi-layered pinion configuration is constructed after installation. The first pinion with the smallest number of teeth and the second pinion with the second smallest number of teeth are configured to be self-supporting in the radial direction and coupled to the transmission device via the third pinion with the third smallest number of teeth. The arrangement of the first, second, and third pinions is such that the center plane of the third pinion with the third smallest number of teeth extends axially outside the transmission device. The configuration of the multi-layer pinion gears is such that, after installation, the axial length of the transmission device from the stop portion to the outer axial end of the transmission device is within the range of 34.5 mm to 35.9 mm, and the following conditions apply: The first axial distance from the stop portion of the transmission device to the outer surface of the first pinion with the fewest teeth is greater than 38 mm. Or / and The second distance along the axial direction from the outer end of the transmission device to the outer surface of the first pinion with the fewest teeth is greater than 4.0 mm.

2. A multi-level pinion configuration for a rear wheel assembly of a bicycle having a chain-driven shift mechanism, wherein the multi-level pinion configuration has a rotating shaft and is adapted to be anti-rotationally coupled to a transmission of the rear wheel assembly, wherein the multi-level pinion configuration comprises: At least 11 small gears with different numbers of teeth, Each pinion has an inner surface and an outer surface within its tooth region, as well as a pinion center plane located between the inner and outer surfaces and orthogonal to the axis of rotation. The multi-layered pinion configuration is constructed after installation. The first pinion with the smallest number of teeth and the second pinion with the second smallest number of teeth are configured to be self-supporting in the radial direction and coupled to the transmission device via the third pinion with the third smallest number of teeth. The arrangement of the first, second, and third pinions is such that the center plane of the third pinion with the third smallest number of teeth extends axially outside the transmission device. The construction method of the multi-layer pinion configuration is applicable when, after installation, the axial length of the transmission device from the transmission device stop to the axial outer end of the transmission device is in the range of 25 mm to 27 mm, and the following conditions apply: The first axial distance from the stop portion of the transmission device to the outer surface of the first pinion with the fewest teeth is greater than 34 mm. Or / and The second distance along the axial direction from the outer end of the transmission device to the outer surface of the first pinion with the fewest teeth is greater than 8.0 mm.

3. The multi-layer pinion configuration according to claim 1 or claim 2, wherein... The transmission device has a transmission element profile on a first region of its radially outer surface, the transmission element profile being arranged axially outward from the stop portion of the transmission device along a first axial length. The first axial length is less than the second axial length extending from the stop portion of the transmission device to the outer axial end of the transmission device. The transmission device does not have the transmission component outline on a second region of its radial outer surface adjacent to the end side of the transmission device. The transmission device has an opening that extends radially outward from the central axis of the transmission device and axially inward from the outer end side of the axial direction. The opening has internal threads on its radial inner surface.

4. The multi-layer pinion configuration according to claim 3, wherein... The first axial length of the transmission device from the stop portion of the transmission device to the end of the transmission component profile, on the transmission device for which the transmission component profile is arranged. When the multi-layer pinion configuration is constructed according to claim 1, it is greater than 32.9 mm, or When the multi-layer pinion configuration is constructed according to claim 2, it is greater than 24.7 mm.

5. The multi-layer pinion configuration according to claim 1 or 2, wherein... The second axial length of the transmission device from the stop portion of the transmission device to the end side of the transmission device. When the multi-layer pinion configuration is constructed according to claim 1, the diameter is greater than 34.2 mm. When the multi-layer pinion configuration is constructed according to claim 2, it is greater than 25.0 mm.

6. The multi-layer pinion configuration according to claim 1 or 2, wherein The first outer diameter of the transmission device within a first region along the first axial length of the transmission device When the multi-layer pinion configuration is constructed according to claim 1, it is greater than 34.2 mm, or When the multi-layer pinion configuration is constructed according to claim 2, the diameter is greater than 32 mm.

7. The multi-layer pinion configuration according to claim 1 or 2, wherein The second outer diameter of the transmission device in the second region adjacent to the end side of the transmission device. When the multi-layer pinion configuration is constructed according to claim 1, it is greater than 31.4 mm, or When the multi-layer pinion configuration is constructed according to claim 2, it is greater than 28.5 mm.

8. The multi-layer pinion configuration according to claim 1 or 2, wherein The first nominal diameter of the internal thread of the transmission device that is axially adjacent to its end side When the multi-layer pinion configuration is constructed according to claim 1, it is greater than 29.8 mm, or When the multi-layer pinion configuration is constructed according to claim 2, it is greater than 25.2 mm.

9. A multi-level pinion configuration for a rear wheel assembly of a bicycle having a chain-driven shift mechanism, wherein the multi-level pinion configuration has a rotating shaft and is adapted to be anti-rotationally coupled to a transmission of the rear wheel assembly, wherein the multi-level pinion configuration comprises: At least 11 small gears with different numbers of teeth, Each pinion has an inner surface and an outer surface within its tooth region, as well as a pinion center plane located between the inner and outer surfaces and orthogonal to the axis of rotation. The multi-layered pinion configuration is constructed after installation. The first pinion with the smallest number of teeth and the second pinion with the second smallest number of teeth are configured to be self-supporting in the radial direction and coupled to the transmission device via the third pinion with the third smallest number of teeth. The arrangement of the first, second, and third pinions is such that the center plane of the third pinion with the third smallest number of teeth extends axially outside the transmission device. The construction method of the multi-layer pinion configuration is applicable when, after installation, the axial length of the transmission device from the transmission device stop to the axial outer end of the transmission device is in the range of 28.5 mm to 30.5 mm, and the following conditions apply: The first axial distance from the stop portion of the transmission device to the outer surface of the first pinion with the fewest teeth is greater than 37.4 mm. Or / and The second distance along the axial direction from the outer end of the transmission device to the outer surface of the first pinion with the fewest teeth is greater than 9.1 mm.

10. The multi-layer pinion configuration according to claim 9, wherein... The transmission device includes: The transmission device body has external threads on its outer peripheral surface in the region adjacent to the transmission device stop. A receiving body having an internal thread on its inner circumferential surface, the internal thread being adapted to engage with the external thread of the transmission device body. After the transmission device is installed, the accommodating body is arranged radially outside the transmission device body, and extends axially outward from its axially outer end onto the transmission device body. The inner diameter of the outer axial end of the accommodating body is smaller than the outer diameter of the transmission device body.

11. The multi-layer pinion configuration according to claim 10, wherein the axial outer end of the multi-layer pinion configuration is flush with the axial end of the accommodating body, or the axial outer end of the accommodating body extends out by a maximum of 0.9 mm.

12. The multi-layer pinion configuration according to claim 10 or 11, wherein the inner diameter of the receiving body gradually tapers between its internal thread and its projecting axial outer end.

13. The multi-layer pinion configuration according to claim 10 or 11, wherein the interface between the housing and the transmission body is arranged more inwardly in the axial direction than the interface between the housing and the multi-layer pinion configuration.

14. The multi-layer pinion configuration according to claim 10 or 11, wherein the transmission device body has a transmission member profile on its outer peripheral surface arranged adjacent to its transmission device stop portion.

15. The multi-layer pinion configuration according to claim 14, wherein the transmission profile includes splines, and the number of splines is 8, 9, or 22.

16. A rear wheel assembly for a bicycle having a chain-driven shift mechanism, comprising: It can be positioned at the rear wheel hub between two opposite frame sections of a bicycle. A transmission device rotatably mounted on the rear wheel hub, and A multi-layer pinion configuration that is anti-rotationally coupled to or can be anti-rotationally coupled to the transmission device according to any one of claims 1 to 15.

17. The rear wheel assembly of claim 16, further comprising a hub end cap arranged outwardly on the rear wheel hub adjacent to the drive unit in the axial direction, and another hub end cap arranged on the rear wheel hub further away from the drive unit and adjacent to the frame section, wherein the hub end cap distance between the axially outer ends of the hub end cap and the other hub end cap is at least 142 mm.

18. The rear wheel assembly of claim 17, wherein... The third distance between the transmission device stop and the axial outer end of the hub end cover of the transmission device. When the multi-layer pinion configuration is constructed according to claim 1, it is greater than 42.5 mm, or When the multi-layer pinion configuration is constructed according to claim 2, it is greater than 38.1 mm, or When the multi-layer pinion configuration is constructed according to claim 9, the diameter is greater than 42.5 mm.

19. A rear wheel assembly and bicycle frame for a bicycle having a chain-driven shift mechanism, wherein the rear wheel assembly comprises: The rear wheel hub is located between two opposite frame sections of the bicycle. A transmission device rotatably coupled to the rear wheel hub, and A multi-layered pinion configuration having at least 11 pinions with different numbers of teeth, either anti-rotationally coupled to or capable of anti-rotationally coupling with the transmission, wherein each pinion has an inner and outer surface within its tooth region, and a pinion center plane located between the inner and outer surfaces and orthogonal to the rear wheel hub. After the rear wheel assembly is assembled on the bicycle frame... The fourth distance axially from the outer surface of the pinion with the fewest teeth to the circumferential surface of the rear fork end of the bicycle frame that is adjacent to and closest to the rear wheel assembly. When the multi-layer pinion configuration is constructed according to any one of claims 1, 3 to 8, the diameter is less than 8.2 mm, or When the multi-layer pinion configuration is constructed according to any one of claims 2 to 8, the diameter is less than 8.7 mm, or When the multi-layer pinion configuration is constructed according to any one of claims 9 to 15, the diameter is less than 8.35 mm, or / and The fifth distance axially from the outer surface of the pinion with the fewest teeth to the recessed surface on the rear fork end of the bicycle frame that is adjacent to the rear wheel assembly and orthogonal to the rear wheel hub. When the multi-layer pinion configuration is constructed according to any one of claims 1, 3 to 8, the diameter is less than 12.2 mm, or When the multi-layer pinion configuration is constructed according to any one of claims 2 to 8, the diameter is less than 12.7 mm, or When the multi-layer pinion configuration is constructed according to any one of claims 9 to 15, the diameter is less than 11.5 mm.

20. The rear wheel assembly and bicycle frame according to claim 19, wherein after the rear wheel assembly and the bicycle frame are assembled, A sixth distance is defined between the outer surface of the pinion with the fewest teeth and the hub end cap. The hub end cap and the transmission device are arranged axially adjacent to each other on the rear hub, and The spatial coefficient formed by the quotient of the fifth distance and the sixth distance is less than 3 and greater than 2.

2.

21. The rear wheel assembly and bicycle frame of claim 20, wherein... The sixth distance is 4.7 + / - 0.2 mm.

22. The rear wheel assembly and bicycle frame according to any one of claims 19 to 21, further comprising a derailleur hanger, the derailleur hanger being mounted or potentially mounted on the rear fork end of the bicycle frame and, upon assembly, contacting the hub end cap to be held in a position that guides the rear axle through the derailleur hanger and the rear hub.

23. The rear wheel assembly and bicycle frame according to any one of claims 19 to 21, wherein the multi-layer pinion configuration of the rear wheel assembly is constructed according to any one of claims 1 to 15.

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