CHAIN ​​SHIELD FOR A BICYCLE

Description

Technical area

[0001] The invention relates to a bicycle attachment for shielding a traction drive of a bicycle drive. The invention also relates to a bicycle rear triangle and a bicycle with such a bicycle attachment. State of the art

[0002] It is known to attach a chain guard, for example a chain guard disc, to a bicycle crankset to prevent a cyclist's trousers from coming into contact with a chainring of the crankset. Document JPH0899663A discloses a bicycle component of this type. Description of the invention

[0003] In one aspect, the invention relates to a bicycle attachment for shielding a section of a traction drive of the bicycle drive that is exposed between two gears of a bicycle drive.

[0004] The drive mechanism can be a bicycle chain. If the drive mechanism is a bicycle chain, the two gears can be a chainring and a pinion of the bicycle drive. The chainring can be a front gear of the bicycle drive connected to a crank and a crank spider. The pinion can be a rear gear of the bicycle drive connected to a hub of a rear wheel.

[0005] As an alternative to a bicycle chain, the traction drive can be a toothed belt. In this case, one of the two gears can be a front gear connected to the crank and the crank spider, and the other of the two gears can be a rear gear connected to the rear wheel hub. The bicycle attachment can therefore be a traction drive guard, particularly a chain guard.

[0006] The exposed portion of the traction drive may comprise a portion of the traction drive that does not mesh with the teeth of one of the gears. The exposed portion of the traction drive may also be formed from such a portion. The exposed portion of the traction drive may be spatially arranged between the two gears.

[0007] Shielding the exposed section of the traction drive can involve at least partially concealing, covering, surrounding, and / or enclosing the exposed section of the traction drive. The shielding can also temporarily guide the exposed section of the traction drive when the bicycle attachment is in motion, i.e., when mounted on a bicycle and while riding the bicycle, if the exposed section of the traction drive abuts and temporarily touches the bicycle attachment. However, the shielding does not permanently guide the exposed section of the traction drive during motion.Rather, the bicycle attachment should be able to replace a permanent traction drive guide, in particular a chain guide, and at the same time still act as a jump-off protection to protect the traction drive from jumping off one of the two gears, without the need for a permanent mechanical guide of the traction drive through the bicycle attachment.

[0008] The bicycle attachment is designed for attachment to a drive-side strut, in particular a chainstay, of a bicycle rear triangle. The drive-side strut can be the right or left strut with respect to the operation of the bicycle, which connects the bottom bracket to the hub of the rear wheel on the bicycle drive side. The drive-side strut can be spring-mounted on the bicycle frame. The drive-side strut can thus be designed as a swing arm or have a swing arm. When the bicycle attachment is attached, the bicycle attachment is attached to the drive-side strut. The bicycle attachment can be firmly connected to the drive-side strut, for example, screwed to it, wherein the bicycle attachment can be arranged at least partially flush with the drive-side strut.The bicycle attachment can also be attached to the drive-side strut or snapped into it, whereby the bicycle attachment can engage with the drive-side strut.

[0009] The bicycle attachment surrounds the exposed section of the traction drive on at least three sides when fastened to the drive-side strut. The bicycle attachment can thus conceal, cover, surround and / or enclose the exposed section of the traction drive on at least three sides when fastened. The bicycle attachment can thus have three component sides or component walls, which can be angled to one another in pairs. The bicycle attachment can therefore have a U-profile in a component profile transverse to a longitudinal extent of the bicycle attachment. The bicycle attachment can therefore be a traction drive tunnel, in particular a chain tunnel, which encloses the exposed section of the traction drive in three walls.

[0010] In connection with the invention, a bicycle attachment for attachment to a bicycle is provided, which can surround a traction drive of a bicycle drive with three surfaces and at a distance. An exposed section of the traction drive can thus be shielded or protected from environmental influences by the bicycle attachment. The bicycle attachment can thus be protected, for example, from dirt during riding and function as a splash guard. In addition, the bicycle attachment can make it more difficult for the traction drive to jump off the gears and prevent damage and injuries caused by a cyclist touching the traction drive during riding. The bicycle attachment can thus also function as a jump-off guard or as a ride guard. The bicycle attachment can thus advantageously provide dual functionality as a tire splash guard and as a chain jump-off guard.

[0011] According to one embodiment of the bicycle attachment, the bicycle attachment is designed to be attached exclusively to the drive-side strut of the bicycle rear triangle. The bicycle attachment can be attached or designed to be attached only to the drive-side strut. The bicycle attachment is thus not attached to the bicycle frame or to another strut of the bicycle rear triangle. If the drive-side strut is spring-mounted on the bicycle frame, the bicycle attachment can thus carry out a movement of the drive-side strut relative to the bicycle frame when the drive-side strut compresses or rebounds. The bicycle attachment can thus move relative to a chainring rotatably mounted on the bicycle frame when the drive-side strut compresses or rebounds, and can execute a pitching movement together with the drive-side strut during compression or rebound.The bicycle attachment can thus be designed as a rigid bicycle attachment. The bicycle attachment itself can therefore advantageously be low-maintenance, as the bicycle attachment itself can be designed without any joints requiring maintenance.

[0012] According to the invention, the bicycle attachment has an inner component region for shielding the exposed section of the traction drive from a rear wheel tire arranged on the bicycle rear triangle. The inner component region can be a component region facing the rear wheel tire or the center plane of the bicycle when the bicycle attachment is attached, or a component region adjacent thereto. In this state, the inner component region can be arranged in regions between a region of the rear wheel tire and the exposed section of the traction drive. The inner component region can extend vertically in this state. The inner region can thus advantageously shield the traction drive from the effects of dirt thrown off by the rear wheel tire when the bicycle attachment is in operation.

[0013] According to the invention, the bicycle attachment has an upper component area for further shielding the exposed section of the traction drive.

[0014] The upper component area can extend horizontally when the bicycle attachment is attached. In this state, the upper component area can extend outwards from the inner component area or away from the center plane of the bicycle. The inner component area and the upper component area can form or enclose an angle, for example an acute angle, i.e. an angle of less than 90 degrees, or a right angle. An edge can therefore be formed between the inner component area and the upper component area, which edge can be rounded or flattened. The upper area can thus advantageously shield the traction drive not only from the effects of dirt from the side, but also from external influences from above, for example contact from a cyclist.

[0015] According to the invention, the bicycle attachment has an external component area for further shielding the exposed section of the traction drive.

[0016] The outer component region can be a component region facing away from the rear wheel tire or the center plane of the bicycle when the bicycle attachment is attached. In this state, the outer component region can thus be further away from the rear wheel tire than the inner component region, with the two regions being spaced apart from one another. In this state, the outer component region can be arranged in regions between a passing crank and a passing pedal of the bicycle drive and the traction drive. In this state, the outer component region can extend vertically, whereby the outer component region can extend in a V-shape and / or at an angle to the inner component region.The distance between the inner and outer component areas can thus decrease downwards, thus reducing the space enclosed by the bicycle component. In this state, the outer component area can extend downwards from the upper component area. The outer component area and the upper component area can form or enclose an angle, for example an acute angle, i.e. an angle of less than 90 degrees, or a right angle. An edge can therefore be formed between the outer component area and the upper component area, which edge can be rounded or flattened. The outer component area can thus advantageously shield the traction drive from external influences such as the shoes or clothing of a cyclist when the bicycle component is in operation.

[0017] The bicycle attachment can be a component that is angled or curved at least twice, whereby the bicycle attachment can have two upper edges. From the upper component area, the outer component area and the inner component area can extend downwards together in a funnel shape.

[0018] According to a further embodiment of the bicycle attachment, the bicycle attachment has a lower fastening region for fastening the bicycle attachment to the drive-side strut. The lower fastening region of the bicycle attachment can extend horizontally on the drive-side strut when the bicycle attachment is fastened. In this state, the lower fastening region can extend outward from the inner component region or away from the center plane of the bicycle. Alternatively or additionally, the lower fastening region can extend inward from the outer component region or toward the center plane of the bicycle in this state.The inner component area and / or the outer component area can each form or enclose an angle with the lower fastening area, for example an obtuse angle, i.e., an angle greater than 90 degrees, or a right angle. Therefore, an edge can be formed between the inner component area and / or the outer component area and the lower fastening area, which edge can be rounded or flattened. The lower fastening area can also shield the drive-side strut from the traction mechanism drive in the event of a downward deflection of the traction mechanism drive, thus protecting it from impacts from the traction mechanism drive.

[0019] The bicycle attachment can therefore also be a component with at least three or four angles or bends, whereby the bicycle attachment can have two upper edges and at least one lower edge. The lower attachment area can be connected to the inner component area and to the outer component area, whereby the attachment area is then not closed and has two separate sections. The bicycle attachment can have an open cross-section.

[0020] According to this embodiment, the lower fastening area can have a fastening recess for a fastening means. In the attached state, the bicycle attachment can thus be screwed to the drive-side strut using a screw as the fastening means.

[0021] According to a further embodiment of the bicycle attachment, the bicycle attachment is formed in one piece. The bicycle attachment can thus comprise a bent sheet metal, whereby the bicycle attachment can be made of metal, for example, aluminum. Alternatively, the bicycle attachment can comprise an injection-molded part, whereby the bicycle attachment can be made of a plastic. In a further alternative, the bicycle attachment is made of carbon. The bicycle attachment can thus advantageously be manufactured efficiently and in one piece.

[0022] According to a further embodiment of the bicycle attachment, the inner component region is plate-shaped and designed as a closed surface. The closed surface can be impermeable to dirt thrown off the rear wheel tire, for example soil material or dirty water. The closed surface can therefore be seamless or have recesses through which such dirt cannot penetrate. The closed surface can thus be impermeable to dirt and / or water. Corresponding contamination of the traction drive can thus be reduced with the bicycle attachment. Reduced contamination can also reduce wear on the traction drive, in particular on a bicycle chain, and increase the service life of the traction drive. Increased running resistance caused by a dirty traction drive can also be advantageously avoided during riding.

[0023] According to a further embodiment of the bicycle attachment, the outer component area is plate-shaped and has a viewing recess. Through the viewing recess, the condition of the traction drive surrounded by the bicycle attachment can be inspected from the outside, even in the area of ​​the outer component area. The viewing recess can have the shape of a polygon, for example, a triangle. Thus, the exposed section of the traction drive is also visible from the outside in the area of ​​the bicycle attachment. A further advantageous effect of the viewing recess is a reduction in the weight of the bicycle attachment.

[0024] According to a further embodiment of the bicycle attachment, the outer component region has a concave outer contour section for providing clearance for a moving crank arm of the bicycle drive. The outer contour section can have at least one curved section. In addition, the outer contour section can have at least one straight section. Thus, when attached to the drive-side strut, the bicycle attachment can also extend above a front gear of the bicycle drive, in particular a chainring, without being attached to this bicycle component. The bicycle attachment can thus additionally function to shield a front gear of the bicycle drive, in particular a chainring.

[0025] According to a further embodiment of the bicycle attachment, the inner component region has a concave outer contour section for providing clearance for a moving crank spider of the bicycle drive. The outer contour section can have at least one curved section. In addition, the outer contour section can have at least one straight section. Thus, when attached to the drive-side strut, the bicycle attachment can also extend above a bottom bracket shell of the bicycle frame without being attached to the bicycle frame. The bicycle attachment can thus be attached exclusively to the bicycle rear triangle. The bicycle attachment can thus additionally function to shield a crankset of the bicycle drive, in particular a chainring, and to shield the crankset from the effects of dirt during riding.

[0026] According to a further embodiment of the bicycle attachment, the concave outer contour section of the outer component region and the concave outer contour section of the inner component region are shaped differently. The outer component region and the inner component region can therefore have different outer contours. The outer contour of the outer component region can extend further forward toward the front gear in the attached state than the outer contour of the inner component region. This allows for improved outward shielding of the front gear.

[0027] According to the invention, the upper component region tapers at least partially toward a front gear of the two gears, in particular a chainring, of the bicycle drive. The regions extending downward from the upper component region in the attached state can thus be arranged at an angle to one another. In this state, the bicycle attachment can extend from rear to front in a funnel shape. In the space enclosed by the bicycle attachment, freedom of movement can thus be provided for the traction drive, which can thus also run on one of a plurality of different rear gears.

[0028] According to a further embodiment of the bicycle attachment, the inner component area and / or the outer component area tapers downwards, at least in sections. Such a taper can be formed by one of the described free spaces or outer contour sections. The inner component area and / or the outer component area can also be wedge-shaped.

[0029] According to a further embodiment of the bicycle attachment, the bicycle attachment has a spacer between the inner component region and the outer component region for stiffening the bicycle attachment. The spacer can be attached to the inner component region. The outer component region can rest on the spacer, wherein a holding means extending through the outer component region can engage with the spacer. The bicycle attachment can thus also have a screw which extends through the outer component region and can be screwed to the spacer. For this purpose, the spacer can have an internal thread into which the screw can be screwed. The spacer can thus be a bolt with an internal thread.The spacer advantageously prevents the outer component area from moving relative to the inner component area during operation. Another advantageous effect of the spacer is that it provides lower impact protection for the traction drive.

[0030] According to a further embodiment of the bicycle attachment, the spacer engages the drive-side strut when fastened. The inner component region can have a passage for this purpose, at which the spacer can be arranged and through which the retaining means can pass. The bicycle attachment can thus also be fastened to the drive-side strut with the retaining means. If the bicycle attachment has the fastening region, the bicycle attachment can be fastened twice to the drive-side strut. For example, the bicycle attachment is screwed twice to the drive-side strut. The bicycle attachment can thus be securely mounted to the drive-side strut.

[0031] According to a further embodiment of the bicycle attachment, an insert facing the traction mechanism is arranged on the bicycle attachment to provide a sliding surface for the traction mechanism. The insert can be arranged in any of the described regions and surfaces. The insert can be made of plastic, for example. The insert can have a lower coefficient of sliding friction than the material of the described regions and thus provide a sliding surface for the traction mechanism in the event of temporary contact or temporary guidance of the traction mechanism. Furthermore, the insert can be arranged on the bicycle attachment to provide impact protection for the traction mechanism. For this purpose, the insert can also be made of an elastic material, for example rubber.

[0032] According to a further embodiment of the bicycle attachment, the bicycle attachment has a portion projecting toward a front gear of the two gears, in particular a chainring, to provide chain slip protection. The projecting portion can be formed by the outer component region or by its outer contour. In the attached state, the projecting portion can extend up to or beyond a vertex of the chainring.

[0033] According to a further embodiment of the bicycle attachment, the bicycle attachment has an outer contour region that follows a contour of the drive-side strut in the attached state, in particular over a wide area. The bicycle attachment can thus be attached flush to the drive-side strut. The attachment region and / or the inner component region can have a respective fitting region that precisely matches an attachment region for attaching the bicycle attachment to the drive-side strut. A fastening aid for attaching the bicycle attachment to the drive-side strut and / or to the bicycle attachment can also be formed.

[0034] In a further aspect, the invention relates to a bicycle rear triangle which has an attachment area on a drive-side strut for attaching the bicycle attachment according to the preceding aspect. The attachment area can be a fastening area for attaching the bicycle attachment. The bicycle attachment can be attached to the drive-side strut as in the previous aspect or according to the fastening state described therein. The attachment area of ​​the bicycle rear triangle can form a snug fit with a geometrically corresponding area of ​​the bicycle attachment, in particular the fastening area thereof, for the precise attachment of the bicycle attachment. The attachment of the bicycle attachment can thus already be taken into account during production of a bicycle rear triangle.

[0035] In another aspect, the invention relates to a bicycle with a rear triangle that is sprung and pivoted to a bicycle frame and has a drive-side stay, in particular a chainstay. The bicycle can be a mountain bike or a full-suspension bike. The bicycle can be an e-bike, in which case the traction drive can be electrically driven.

[0036] A bicycle attachment according to the corresponding preceding aspect is attached to the drive-side strut of the bicycle. The bicycle attachment can be attached to the drive-side strut as described in this aspect or according to the attachment state described therein. The bicycle attachment can be detachably attached, for example, by being screwed at least once.

[0037] The bicycle attachment is attached to the drive-side strut and dimensioned in such a way that the exposed section of the traction drive is surrounded on three sides by the bicycle attachment when the bicycle frame is in its extended state and when the bicycle frame is in its compressed state. This can be achieved by attaching the bicycle attachment to the drive-side strut in a spring-loaded manner, meaning that the bicycle attachment also carries out the spring movement of the bicycle frame or the drive-side strut during compression and rebound.

[0038] In both states, the bicycle attachment can be spaced apart from the exposed section of the traction drive. A gap can be maintained between the upper component area of ​​the bicycle component and the traction drive in both states. Thus, the bicycle attachment can surround the exposed section of the traction drive on three sides or in a tunnel-like manner in both states. Short description of the characters

[0039] Figure 1 shows a bicycle attachment according to an embodiment of the invention in a side view from the outside. Figure 2 shows the bicycle attachment of Figure 1 in another side view from the inside. Figure 3 shows the bicycle attachment of Figure 1 in a perspective view from below. Figure 4 shows the bicycle attachment of Figure 1in a further perspective view from above. Figure 5 shows the bicycle attachment in a state of attachment to a drive-side strut of a sprung rear frame of a bicycle, which is in a rebounded state. Figure 6 shows the rear frame of Figure 5 with the bicycle attachment in a compressed state. Detailed description of embodiments

[0040] The terms "top", "bottom", "outside", "inside", "front" and "rear" used in the preceding illustration and the following description in connection with the bicycle attachment refer to a fastening state of the bicycle attachment to a drive-side strut of a rear frame of a bicycle or to a riding operation of the bicycle.

[0041] Figure 1shows a bicycle attachment 100. The bicycle attachment 100 has an inner component region 30, an upper component region 40, and an outer component region 50. If an exposed section of a traction drive not shown in Figures 1 to 4 is located in the space enclosed by the component regions 30, 40, 50, the exposed section of the traction drive is surrounded on three sides by these component regions 30, 40, 50.

[0042] The upper component area 40 is connected to the inner component area 30 via a left upper edge 42. The upper component area 40 is also connected to the outer component area 50 via a right upper edge 44. At least one of the two edges 42, 44 can, as in the Figures 1 to 4 shown embodiment, rounded. In Figure 1 is the rounding of the upper right edge 44 and in Figure 2the rounding of the upper left edge 42 is shown.

[0043] The inner component region 30 can have a fin-like outer contour 33. A projecting section 56 is arranged in a front region of the outer component region 50, which can impart this fin shape to the outer component region 50. An optional viewing recess 52 can also be arranged in the outer component region 50, which can have a triangular contour with flattened and / or rounded corners. The contour of the viewing recess 52 can run, at least in sections, parallel to the outer contour 53 of the outer component region 50.

[0044] The inner component area 30 can be designed differently than the outer component area 50. In this case, an outer contour 33 of the inner component area 30 can differ from the outer contour 53 of the outer component area 50. The inner component area 30 is used for Figure 2 described in more detail.

[0045] At a lower region or at a lower edge of the inner component region 30, a fastening region 60 is arranged, which has a lower outer contour region 102. The fastening region 60 is connected to the inner component region 30 via a left lower edge 46. The left lower edge 46 can be rounded or flattened. The fastening region 60 has a Figure 3 shown fastening recess 62, in which a fastening means 64 for fastening the bicycle attachment 100 to the Figures 5 and 6shown drive-side chainstay 20. The fastening means 64 can be a screw, for example a hexagon socket screw.

[0046] The inner component area 30 can also be connected to the outer component area 50 with a Figures 3 and 4 The outer component region 50 can be screwed to the inner component region 30 by means of the holding means 72, for example a hexagon socket screw, wherein the inner component region 30 has a Figure 2 shown recess 32 with internal thread.

[0047] Figure 2 shows the bicycle attachment 100 with a view of the inner component area 30. This can be designed like a fin. The outer component area 50 and / or the inner component area 30 can be as shown in the Figures 1 and 2shown, each taper downwards. The inner component region 30 can also have a projecting section in a front region thereof. The recess 32 in the inner component region 30 can be closed by the holding means 72, whereby the inner component region 30 can also form a closed surface with the recess 32.

[0048] The retaining means 72 can be arranged flush with the inner component area 30 in the recess 32. The retaining means 72 can also protrude through the recess 32 and protrude inwards from the inner component area 30. If this is the case, the retaining means 72 can be inserted into the chain stay 20 or into the Figures 5 and 6shown swing arm 22 and be screwed to the drive-side chainstay 20 or the swing arm 22. The bicycle attachment 100 can thus be fastened to the drive-side chainstay 20 or the swing arm 22 with the fastening means 64 and the holding means 72.

[0049] The outer component area 50 has an outer contour section 54, which corresponds to a Figures 5 and 6 shown crank arm 16 provides a clearance necessary for its movement when the bicycle attachment 100 is attached to the drive-side chainstay 20. The inner component area 30 has an inner outer contour section 34, which corresponds to a Figures 5 and 6shown crank spider 18 provides a comparable clearance when the attachment 100 is attached to the drive-side chainstay 20. The bicycle attachment 100 thus does not hinder a rotating movement of the Figures 5 and 6 shown crankset 11 of the bicycle drive 10.

[0050] In the Figures 3 and 4 The bicycle attachment 100 is shown in perspective views obliquely from below and obliquely from above, looking toward the outer component area 50. An insert 80 is mounted on a downwardly directed surface of the upper component area 40, which insert provides a sliding surface or impact surface for a traction mechanism of the bicycle drive. The insert 80 can extend to the front end of the upper component area 40, as shown in Figure 4 shown, or extend only partially over the upper part of the component, as in Figure 3shown. In addition, a spacer 70 can be arranged on the inner component region 30, into which the retaining means 72 engages. If the retaining means 72 is a screw, the outer component region 50 can be screwed to the inner component region 30 via the spacer 70. Furthermore, a defined distance between the inner component region 30 and the outer component region 50 can be defined in this way, and the bicycle attachment 100 can be stiffened.

[0051] The one in the Figures 1 to 4 not shown traction drive, which is in the Figures 5 and 6In one embodiment, the chain is designed as a bicycle chain 14, and can extend between the inner component region 30, the upper component region 40, and the outer component region 50, whereby an exposed section of the traction drive is surrounded by these component regions 30, 40, 50 at a distance on three sides. The traction drive can also be surrounded by the fastening region 60 on a fourth side. The spacer 70 can also surround the traction drive on the fourth side.

[0052] As in Figure 4As also shown, the upper component region 40 can taper toward the front. Thus, the bicycle attachment 100 is funnel-shaped toward the front. Furthermore, the spacer 70 can have a smaller width than the section of the upper component region 40 located above the spacer 70, whereby the bicycle attachment 100 also extends downward in a funnel shape. In other words, the distance between the outer component region 50 and the inner component region 30 then decreases from top to bottom.

[0053] As in the Figures 3 and 4 Also shown, the fastening area 60 has an outer contour area 102, which can be stepped. Such a gradation of the fastening area 60 can ensure a precise mounting of the bicycle attachment 100 on a mounting area 202 of the drive-side chainstay 20, as in the Figures 5 and 6 shown, ready. In Figure 5is the bicycle attachment 100 of the Figures 1 to 4 shown in a state of attachment to a drive-side chainstay 20 of a bicycle rear triangle 200. The drive-side chainstay 20 has a swing arm 22, to which the bicycle attachment 100 can be attached using the fastening means 64. Alternatively or additionally, the bicycle attachment 100 can be attached to the swing arm 22 of the drive-side chainstay 20 using the holding means 72, as described for the previous figures. The opposing regions, the outer contour region 102 of the bicycle attachment 100 and the attachment region 202 of the bicycle rear triangle 200, can form a snug fit.

[0054] In Figure 5 The bicycle rear frame 200 is shown in a rebounded state Z1. Between the exposed section 15 of the Figures 5 and 6shown bicycle chain 14 and the surrounding bicycle attachment 100, a distance is formed to the upper component area 40. In addition, the Figures 5 and 6 The bicycle attachment 100 shown in its attached state maintains a distance from the crank arm 16 and the crank spider 18 of the crankset 11, allowing the latter to move freely. Teeth of the chainring 12 can be surrounded at least partially by the bicycle attachment 100.

[0055] In Figure 6 The bicycle rear triangle 200 is shown in a compressed state Z2. The angle enclosed by the drive-side chain stay 20 and a seat tube 4 of the bicycle frame 2 is smaller in this compressed state Z2 than the corresponding angle in the Figure 5shown extended state Z1. Between the two states Z1, Z2, the drive-side chainstay 20 can in principle be arranged at any angle during cycling of the bicycle. For this purpose, the drive-side chainstay 20 is spring-mounted on the bicycle frame 2 via its swing arm 22. A suspension of the bicycle rear triangle 200 on the bicycle frame 2 is not shown in the figures, nor is a further strut, in particular a seat stay, connecting the drive-side chainstay 20 at its dropout to the seat tube 4 of the bicycle frame 2.

[0056] In the Figure 6In the compressed state Z2 of the drive-side chain stay 20 shown, the distance between the exposed section 15 of the bicycle chain 14 and the upper component area 40 of the bicycle attachment 100 is reduced compared to the rebounded state Z1. However, the bicycle attachment 100 or its upper component area 40 does not touch the bicycle chain 14 even in the compressed state Z2. As also shown in Figure 2 As shown, the bicycle attachment 100 pivots forward in the compressed state Z2 relative to the bicycle frame 2 and the crankset 11 together with the drive-side chainstay 20. The bicycle attachment 100 continues to surround an area of ​​the chainring 12 that is larger than the corresponding area in the extended state Z1. Reference symbol

[0057] 2Bicycle frame 4Seat tube 10Bicycle drive 11Crankset 12Chainring 14Bicycle chain 15Exposed section 16Crank arm 18Crank spider 20Drive-side strut 22Swing arm 30Inner component area 32Recess 33Outer contour 34Inner outer contour section 40Upper component area 42Left upper edge 44Right upper edge 46Left lower edge 50Outer component area 52Visible recess 53Outer contour 54Outer outer contour section 56Protruding section 60Fastening area 62Fastening recess 64Fasteners 70Spacer 80Insert 100Bicycle component 102Outer contour area 200Bicycle rear triangle 202Mounting area Z1Retracted state Z2Compressed state

Claims

1. A bicycle attachment part (100) for shielding an exposed section (15) of a traction transmission of a bicycle drive (10), in particular a bicycle chain (14), wherein the exposed section (15) is exposed between two gear wheels of the bicycle drive (10), wherein the bicycle attachment part (100) is configured to be mounted on a drive sided strut, in particular a chain strut (20), of a bicycle rear frame (200), and wherein the bicycle attachment part (100), in the state of mounting on the drive sided strut, surrounds the exposed section (15) of the traction transmission on three sides, wherein the bicycle attachment part (100) comprises an inner part region (30) for shielding the exposed section (15) of the traction transmission from a rear wheel tyre, which is arranged on the bicycle rear frame (200), and wherein the bicycle attachment part (100) comprises an upper part region (40) and an outer part region (50) for respectively shielding the exposed section (15) of the traction transmission, characterised in that the upper part region (40) tapers at least in sections towards a front gear wheel of the two gear wheels, in particular a chain ring (12), of the bicycle drive (10).

2. The bicycle attachment part (100) according to claim 1, wherein the bicycle attachment part (100) comprises a lower mounting area (60) for mounting the bicycle attachment part (100) on the drive sided strut, and wherein the lower mounting area (60) comprises a mounting recess (62) for a mounting means (64).

3. The bicycle attachment part (100) according to any one of the preceding claims, wherein the bicycle attachment part (100) is formed integrally.

4. The bicycle attachment part (100) according to any one of the preceding claims, wherein the inner part region (30) is configured plate-shaped and as a closed surface.

5. The bicycle attachment part (100) according to any one of the preceding claims, wherein the outer part region (50) is configured plate-shaped and comprises a viewing recess (52).

6. The bicycle attachment part (100) according to any one of the preceding claims, wherein the outer part region (50) comprises a concave outer contour section (54) for providing a clearance for a moving crank arm (16) of the bicycle drive (10).

7. The bicycle attachment part (100) according to any one of the preceding claims, wherein the inner part region (30) comprises a concave outer contour section (34) for providing a clearance for a moving crank spider (18) of the bicycle drive (10).

8. The bicycle attachment part (100) according to claims 6 and 7, wherein the concave outer contour section (54) of the outer part region (50) and the concave outer contour section (34) of the inner part region (30) are shaped differently.

9. The bicycle attachment part (100) according to any one of the preceding claims, wherein the inner part region (30) and the outer part region (50) taper downwards at least in sections.

10. The bicycle attachment part (100) according to any one of the preceding claims, wherein the bicycle attachment part (100) comprises a spacer (70) between the inner part region (30) and the outer part region (50) for stiffening the bicycle attachment part (100).

11. The bicycle attachment part (100) according to claim 10, wherein the spacer (70) engages in the drive sided strut in the state of mounting.

12. The bicycle attachment part (100) according to any one of the preceding claims, wherein an insert (80) for providing a sliding surface for the traction transmission or for providing an impact protection for the traction transmission is arranged on the bicycle attachment part (100), wherein the insert (80) faces the traction transmission.

13. The bicycle attachment part (100) according to any one of the preceding claims, wherein the bicycle attachment part (100) comprises a section (56) for providing a chain jumping off protection, wherein the section (56) projects towards a front gear wheel of the two gear wheels, in particular a chain ring (12).

14. Bicycle rear frame (200), which comprises, on a drive sided strut, an attachment region (202) for mounting the bicycle attachment part (100) according to any one of the preceding claims.

15. Bicycle, with a bicycle rear frame (200) which is articulated in a spring-mounted manner to a bicycle frame (2) and which comprises a drive sided strut, in particular a chain strut (20), wherein a bicycle attachment part (100) according to any one of claims 1 to 13 is mounted on the drive sided strut, and wherein the bicycle attachment part (100) is mounted to the drive sided strut and is dimensioned in such a way that the exposed section (15) of the traction transmission is surrounded on three sides by the bicycle attachment part (100) in an undeflected state (Z1) of the bicycle rear frame (200) and in a deflected state (Z2) of the bicycle rear frame (200).