TWI715432B - Bicycle rear derailleur - Google Patents

Abstract

A bicycle rear derailleur includes a fixed component, a movable component, a linkage assembly and a chain guide. The fixed component is configured to be mounted on a bicycle frame. The linkage assembly includes a first link and a second link. Two opposite ends of the first link are respectively and pivotably disposed on the fixed component and the movable component. Two opposite ends of the second link are respectively and pivotably disposed on the fixed component and the movable component. The chain guide is pivotably disposed on the movable component. The chain guide is movable between a first position, relatively away from a bicycle wheel, and a second position, relatively close to the bicycle wheel by the movement of the link assembly and the movable component. When the chain guide is in the first position, a profile line of the first link and a profile line of the second link mates with each other, there is a gap formed between the profile lines of the first link and the second link.

Description

Bicycle rear derailleur

The invention relates to a rear derailleur, especially a bicycle rear derailleur.

The bicycle rear derailleur is basically composed of a fixed component fixed to the bicycle frame, two connecting rods, a movable component and a chain guide component. The opposite ends of the two connecting rods are respectively pivoted on the fixed member and the movable member, and the chain guide member is pivoted on the movable member. If the rear derailleur is an electronic rear derailleur, a motor and transmission gears are usually provided in one of the connecting rods. The output power of the motor and the transmission of the transmission gear can drive the two connecting rods and the movable member, so that the chain guide member can move between a position relatively close to the frame and a position relatively far away from the frame to toggle the bicycle chain.

Generally speaking, when a bicycle is racing, the rider usually puts the bicycle's rear derailleur in the lowest gear, and makes the bicycle have a larger gear ratio, so that the rider can step on the pedal for a full circle and the bicycle can move forward longer. Much distance. That is, the chain guide member is located relatively far away from the wheel and corresponds to the smallest chainring of the rear chainring group. In the process of bicycle racing, it is easy to splash dust or sand, but the splashed dust or sand can easily damage the motor and transmission gear in the connecting rod or the motor and transmission gear in the connecting rod through the gap between the fixing member and the two connecting rods. The connecting rod is adjacent to the cable on one side of the wheel. Therefore, researchers in this field are currently working on solving the aforementioned problems.

The present invention is to provide a bicycle rear derailleur, so as to solve the problem that the dust or sand splashed by the bicycle in the process of racing described in the prior art can easily damage the motor in the connecting rod through the gap between the fixing member and the two connecting rods. And the transmission gear or the cable on the side of the connecting rod adjacent to the wheel.

An embodiment of the present invention discloses a bicycle rear derailleur, which is installed on a frame and located beside a wheel, and includes a fixed member, a movable member, a connecting rod assembly and a chain guide member. The fixing member is used to be installed on the frame. The connecting rod assembly includes a first connecting rod and a second connecting rod. Two opposite ends of the first link are pivoted to the fixed member and the movable member, respectively, and two opposite ends of the second link are pivoted to the fixed member and the movable member, respectively. The chain guide member is pivoted on the movable member. Driven by the connecting rod assembly and the movable member, the chain guide member can be located at a first position relatively far away from the wheel or a second position relatively close to the wheel. When the chain guide member is in the first position, the first connecting rod and the second connecting rod are matched with each other by two adjacent contour lines, and there is a gap between the two contour lines.

Another embodiment of the present invention discloses a bicycle rear derailleur, which is installed on a frame and located beside a wheel, and includes a fixed member, a movable member, a connecting rod assembly and a chain guide member. The fixing member is used to be installed on the frame. The connecting rod assembly includes a first connecting rod and a second connecting rod. Two opposite ends of the first link are pivoted to the fixed member and the movable member, respectively, and two opposite ends of the second link are pivoted to the fixed member and the movable member, respectively. The chain guide member is pivoted on the movable member. Driven by the connecting rod assembly and the movable member, the chain guide member can be located at a first position relatively far away from the wheel or a second position relatively close to the wheel. When the chain guide member is in the first position, the fixing member and the second connecting rod are matched with each other by two adjacent contour lines, and there is a gap between the two contour lines.

According to the bicycle rear derailleur of the above embodiment, since the chain guide member is in the first position relatively far from the wheel, the contour line of the first link and the contour line of the second link match each other, or the contour of the fixing member The line and the contour line of the second link match each other, so when the bicycle is racing and the chain guide member is in the first position, the gap between the second link and the fixed member or the second link and the first The gap between a connecting rod is reduced to prevent splashing dust or rubble from entering, which can prevent dust or rubble from damaging the components located in the second connecting rod or the components located on the side of the second connecting rod adjacent to the wheel .

The above description of the content of the present invention and the description of the following embodiments are used to demonstrate and explain the principle of the present invention and provide a further explanation of the scope of the patent application of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic plan view of a bicycle rear derailleur, a frame, and wheels according to a first embodiment of the present invention.

In this embodiment, the bicycle rear derailleur 1 is used to be installed on a frame 2 and located beside a wheel 3. The bicycle rear derailleur 1 includes a fixed member 10, a connecting rod assembly 20, a movable member 30 and a chain guide member 40.

Then, please refer to Figures 1 to 5 together. Fig. 2 is a perspective schematic view of the bicycle rear derailleur of Fig. 1. Fig. 3 is an exploded schematic diagram of the rear derailleur of the bicycle of Fig. 1. FIG. 4 is a three-dimensional schematic diagram of FIG. 2 from another perspective. Fig. 5 is an exploded schematic view of the bicycle rear derailleur of Fig. 1 from another perspective.

In this embodiment or other embodiments, the bicycle rear derailleur 1 may further include a plurality of pivoting posts 50, 60, 70, 80, an elastic member 90, a power source 100, a circuit board 110, and a transmission assembly 120 , A first link 130, a second link 140, a battery 150 and a battery fixing member 160.

The fixing member 10 is used to be installed on the vehicle frame 2, and the fixing member 10 has a first pivot portion 11. The connecting rod assembly 20 includes a first connecting rod 21 and a second connecting rod 22. The first link 21 has a second pivot portion 211 and a third pivot portion 212 opposite to each other. The second pivot portion 211 of the first link 21 is pivoted on one side of the first pivot portion 11 of the fixing member 10 through the pivot post 50. The second link 22 has a fourth pivot portion 221 and a fifth pivot portion 222 opposite to each other. The fourth pivot portion 221 of the second link 22 is pivoted on the other side of the first pivot portion 11 of the fixing member 10 through the pivot post 60. The movable member 30 has a sixth pivotal portion 31, and the sixth pivotal portion 31 has three pivotal ears 311, 312, and 313. The third pivot portion 212 of the first link 21 is pivoted to the pivot lug 311 of the sixth pivot portion 31 of the movable member 30 through the pivot post 70, and the fifth pivot portion 222 of the second link 22 penetrates The pivot post 80 is pivotally disposed on the pivot lugs 312 and 313 of the sixth pivot portion 31 of the movable member 30. In this way, the fixed member 10, the first link 21, the second link 22 and the movable member 30 form a four-bar structure 200. The chain guide member 40 is pivotally disposed on the movable member 30, and the chain guide member 40 is used to guide the bicycle chain (not shown) to move between the chainrings 4 a of different sizes of the rear chainring set 4.

The elastic member 90 is, for example, a torsion spring. The elastic member 90 is sleeved on the pivot post 50, and its opposite ends are respectively provided on the first pivot portion 11 and the first connecting rod 21 of the fixing member 10. The elastic force exerted by the elastic member 90 on the first link 21 can be transmitted to the chain guide member 40 via the first link 21 and the movable member 30, so that the chain guide member 40 moves away from the wheel 3.

In this embodiment, the second connecting rod 22 includes a housing 223 and a cover 224. The cover 224 fixes the housing 223, and the cover 224 and the housing 223 jointly form an accommodating space 225. The power source 100 is, for example, a motor. The power source 100 and the circuit board 110 are disposed in the accommodating space 225, and the circuit board 110 is electrically connected to the power source 100. The circuit board 110 is closer to the cover 224 than the power source 100 is.

In this embodiment, the first pivot portion 11 of the fixing member 10 has an outer surface 111, the first connecting rod 21 also has an outer surface 213, and the cover 224 of the second connecting rod 22 also has an outer surface 2241 . The outer surface 111 of the fixing member 10, the outer surface 213 of the first link 21, and the outer surface 2241 of the second link 22 all face the same direction. When the wheel 3 is placed on the ground and the bicycle rear derailleur 1 is installed on the frame 2 and located next to the wheel 3, the outer surface 111 of the fixing member 10, the outer surface 213 of the first link 21, and the second link 22 The outer surfaces 2241 face away from the wheel 3 and face the ground. In addition, the outer surface 111 of the fixing member 10 has a contour line 1111 adjacent to a side of the second connecting rod 22, and the outer surface 213 of the first connecting rod 21 has a contour line 2131 adjacent to a side of the second connecting rod 22. , And the outer surface 2241 of the second link 22 adjacent to the side of the first link 21 and the fixing member 10 also has an outline 2242.

The transmission assembly 120 includes a plurality of transmission gears 1201 and a transmission rod 1202, for example. These transmission gears 1201 are located in the accommodating space 225 and are connected to each other, and one of the transmission gears 1201 is connected to the power source 100. The transmission rod 1202 is sleeved on the pivot pole 80. One end of the transmission rod 1202 is located in the accommodation space 225 and is connected to another transmission gear 1201, and the transmission rod 1202 is located outside the accommodation space 225. The first link 130 is fixed to the part of the transmission rod 1202 located outside the accommodating space 225. The second link 140 passes through the pivot ear 313 of the sixth pivot portion 31 of the movable member 30 and abuts against the first link 130.

In this embodiment, the bicycle rear derailleur 1 may further include a stop member 170 and another elastic member 180. The stopper 170 is pivotally disposed on the pivot ear 313 of the sixth pivot portion 31 of the movable member 30. The elastic member 180 is, for example, a torsion spring. The elastic member 180 is disposed on the movable member 30 through a plug 190. One end of the elastic member 180 is fixed to the movable member 30, and the other end of the elastic member 180 abuts against the stopper 170, so that the stopper 170 keeps abutting against the first linkage member 130.

In this embodiment, the fixing member 10 further has a battery assembly part 12. The battery 150 is installed in the battery assembly part 12 of the fixing member 10. The battery fixing member 160 is pivoted to the battery assembly part 12. The battery fixing part 160 has a fixing structure 1601, and the fixing structure 1601 is detachably clamped to the battery assembly part 12, so that the battery fixing part 160 and the battery assembly part 12 fix the battery 150 together.

In this embodiment, the battery 150 provides power to the circuit board 110 and the power source 100 through a cable (not shown), for example. Wherein, the cable is located on one side of the first connecting rod 21 and the second connecting rod 22 adjacent to the wheel 3, for example. In addition, the circuit board 110 receives, for example, a gear shift signal from a bicycle brake gear lever (not shown) in a wireless or wired manner. When the circuit board 110 receives the shift signal, the circuit board 110 will activate the power source 100, and then the power generated by the power source 100 will be driven by the transmission gear 1201, the transmission rod 1202, the first linkage 130 and the second linkage 140 The connecting rod assembly 20 and the movable member 30 enable the chain guide member 40 to move between a first position relatively far away from the wheel 3 and a second position relatively close to the wheel 3.

Next, as shown in FIGS. 1 to 3, the bicycle rear derailleur is in the lowest gear, the four-bar linkage structure 200 is in a folded state, and the chain guide member 40 is located at the first position away from the wheel 3 and corresponds to the size The smallest chainring 4a. At this time, the contour line 1111 of the outer surface 111 of the fixing member 10 and the contour line 2131 of the outer surface 213 of the first link 21 are jointly matched with the contour line 2242 of the outer surface 2241 of the second link 22. Wherein, there is a gap G1 between the contour line 1111 of the outer surface 111 of the fixing member 10 and the contour line 2242 of the outer surface 2241 of the second connecting rod 22, and the maximum width of the gap G1 is between 0.3 mm and 3.5 mm. Preferably, the maximum width value of the gap G1 is between 0.5 mm and 2.0 mm. Moreover, the ratio of the maximum width to the minimum width of the gap G1 is, for example, less than 3.5; preferably, the ratio of the maximum width to the minimum width of the gap G1 is, for example, less than 2.5. In addition, the length of the gap G1 is greater than 15 mm; preferably, the length of the gap G1 is greater than 25 mm. On the other hand, there is a gap G2 between the contour line 2131 of the outer surface 213 of the first connecting rod 21 and the contour line 2242 of the outer surface 2241 of the second connecting rod 22, and the maximum width of the gap G2 is 0.3 mm. Preferably, the maximum width of the gap G2 is between 0.5 mm and 2.0 mm. Moreover, the ratio of the maximum width value to the minimum width value of the gap G2 is, for example, less than 3.5; preferably, the ratio of the maximum width value to the minimum width value of the gap G2 is, for example, less than 2.5. In addition, the length of the gap G2 is greater than 15 mm; preferably, the length of the gap G2 is greater than 25 mm.

In this way, when the bicycle is sprinting and the chain guide member 40 is in the first position, the gap G1 between the fixing member 10 and the second link 22 and the first link 21 and the second link The gap G2 between the rods 22 is so small that it is not easy to allow the dust or sand splashed by the bicycle sprint to enter, and can prevent the dust or sand from damaging the power source 100 and the transmission gear 1201 located in the second link 22, and provides The first connecting rod 21 and the second connecting rod 22 are adjacent to the cable protection on one side of the wheel 3.

In addition, when the chain guide member 40 is in the first position, the maximum width of the gap G1 between the contour line 1111 of the outer surface 111 of the fixing member 10 and the contour line 2242 of the outer surface 2241 of the second link 22 If the ratio to the minimum width is close to 1, and the maximum width of the gap G2 between the contour 2131 of the outer surface 213 of the first connecting rod 21 and the contour 2242 of the second connecting rod 22 If the ratio of the width value is close to 1, the width of the gap G1 between the contour line 1111 of the fixed member 10 and the contour line 2242 of the second link 22 is approximately evenly distributed, and the contour line 2131 of the first link 21 and the second link 21 The width of the gap G2 between the contour lines 2242 of the two connecting rods 22 is approximately uniformly distributed. Thereby, the degree of matching between the contour line 1111 of the fixing member 10 and the contour line 2131 of the first connecting rod 21 with the contour line 2242 of the second connecting rod 22 can be increased, and the aesthetics of the bicycle rear derailleur 1 can be increased.

Next, please refer to FIGS. 3 and 6 to 8 together. FIG. 6 is a perspective view of the first linkage member in FIG. 4 pushing against the second linkage member. Fig. 7 is a perspective schematic view showing the four-bar linkage structure of the bicycle rear derailleur of Fig. 2 expanded. Fig. 8 is a schematic plan view of the chain guide member of Fig. 1 located relatively close to the wheel.

When the circuit board 110 receives the shift signal as an upshift signal, the power source 100 will be transmitted to the transmission rod 1202 via the transmission gear 1201 to rotate the first linkage 130 so that the first linkage 130 pushes the second linkage 140. Then, while the first linkage 130 pushes the second linkage 140, the four-bar linkage structure 200 will gradually expand, so that the chain guide member 40 gradually faces the wheel from a position relatively far away from the wheel 3 (the first position) 3 Move. Next, as shown in FIG. 8, after the power source 100 stops operating, the chain guide member 40 is located at the second position and corresponds to the chainring 4a with the next smallest size. In this way, the bicycle chain can be moved from the chainring 4a with the smallest size to the chainring 4a with the next smallest size.

In this embodiment, the chain guide member 40 at the second position is not limited to correspond to the chainring 4a with the next smallest size. In other embodiments, the chain guide member at the second position may correspond to other chainrings.

In this embodiment, the elastic member 180 keeps the stop member 170 against the first link member 130, which can reduce the angle at which the first link member 130 pivots in the opposite direction due to unexpected external forces, thereby reducing the transmission gear The probability of damage to 1201 and power source 100.

In the state that the chain guide member 40 is in the second position, when the circuit board 110 receives the back gear signal, the power source 100 will cause the transmission gear 1201, the transmission rod 1202, and the first linkage 130 to rotate in reverse, and then the elastic member The elastic force of 90 will cause the four-bar linkage structure 200 to be folded, and the chain guide member 40 will move away from the wheel 3. After the power source 100 stops operating, the chain guide member 40 is located at the first position and corresponds to the chainring 4a with the smallest size. In this way, the bicycle chain can be moved from the chainring 4a with the smallest size to the chainring with the smallest size.

According to the bicycle rear derailleur of the above embodiment, since the chain guide member is in the first position relatively far away from the wheel, the contour line of the first link matches the contour line of the second link, and the contour of the fixing member The line and the outline of the second link match each other, so when the bicycle is racing and the chain guide member is in the first position, the gap between the fixed member, the first link and the second link can be reduced It is difficult to let the splashed dust or gravel enter, and it can prevent the dust or gravel from damaging the power source and transmission gear located in the second link, and provide the side of the first link and the second link adjacent to the wheel Cable protection.

Although the present invention is disclosed in the foregoing embodiments as described above, it is not intended to limit the present invention. Anyone familiar with similar art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of patent protection for inventions shall be determined by the scope of patent applications attached to this specification.

1: Bicycle rear derailleur

2: Frame

3: wheel

4: Rear chainring

4a: chainring

10: Fixed components

11: The first pivot

12: Battery Assembly Department

111: outer surface

1111: Contour

20: Connecting rod assembly

21: The first link

211: Second pivot

212: Third pivot

213: outer surface

2131: Contour

22: second link

221: fourth pivot

222: Fifth pivot

223: Shell

225: accommodating space

224: Lid

2241: outer surface

2242: Contour

30: Active component

31: The sixth pivot

311, 312, 313: pivot ear

40: Chain guide member

50, 60, 70, 80: pivot post

90: Elastic

100: power source

110: circuit board

120: Transmission components

1201: Transmission gear

1202: Transmission rod

130: The first linkage

140: second linkage

150: battery

160: battery holder

1601: card structure

170: stop

180: Elastic

190: Bolt

200: Four-link structure

G1, G2: gap

Fig. 1 is a schematic plan view of a bicycle rear derailleur, frame and wheels according to a first embodiment of the present invention. Fig. 2 is a perspective schematic view of the bicycle rear derailleur of Fig. 1. Fig. 3 is an exploded schematic diagram of the rear derailleur of the bicycle of Fig. 1. FIG. 4 is a three-dimensional schematic diagram of FIG. 2 from another perspective. Fig. 5 is an exploded schematic view of the bicycle rear derailleur of Fig. 1 from another perspective. FIG. 6 is a perspective schematic view of the first link member in FIG. 4 pushing against the second link member. Fig. 7 is a perspective schematic view showing the four-bar linkage structure of the bicycle rear derailleur of Fig. 2 expanded. Fig. 8 is a schematic plan view of the chain guide member of Fig. 1 located relatively close to the wheel.

1: Bicycle rear derailleur

2: Frame

3: wheel

4: Rear chainring

4a: chainring

10: Fixed components

11: The first pivot

111: outer surface

20: Connecting rod assembly

21: The first link

213: outer surface

22: second link

2241: outer surface

30: Active component

40: Chain guide member

200: Four-link structure

Claims (27)

A bicycle rear derailleur, which is installed on a frame and is located beside a wheel, comprises: a fixed member for installation on the frame; a movable member; and a connecting rod assembly including a first connecting rod and A second link, two opposite ends of the first link are respectively pivoted to the fixed member and the movable member, and two opposite ends of the second link are respectively pivoted to the fixed member and the movable member; and The chain guide member is pivoted on the movable member; wherein, driven by the link assembly and the movable member, the chain guide member can be located at a first position relatively far away from the wheel or relatively close to a first position of the wheel In two positions, when the chain guide member is in the first position, the first connecting rod and the second connecting rod respectively match with two adjacent contour lines, and there is a gap between the two contour lines. In the bicycle rear derailleur described in item 1 of the scope of patent application, the maximum width of the gap is between 0.3 mm and 3.5 mm. As for the bicycle rear derailleur described in item 2 of the scope of patent application, the maximum width of the gap is preferably between 0.5 mm and 2.0 mm. As for the bicycle rear derailleur described in item 1 of the scope of patent application, the ratio of the maximum width value to the minimum width value of the gap is less than 3.5. For the bicycle rear derailleur described in item 4 of the scope of patent application, the ratio of the maximum width to the minimum width of the gap is preferably less than 2.5. In the bicycle rear derailleur described in item 1 of the scope of patent application, the length of the gap is greater than 15 mm. In the bicycle rear derailleur described in item 6 of the scope of patent application, the length of the gap is preferably greater than 25 mm. According to the bicycle rear derailleur described in claim 1, wherein the first link has an outer surface, the second link has an outer surface, the outer surface of the first link and the second link When the bicycle rear derailleur is installed on the frame, the outer surface of the first connecting rod and the outer surface of the second connecting rod face away from the wheel, and the two contour lines are respectively Located on the outer surface of the first connecting rod and the outer surface of the second connecting rod. The bicycle rear derailleur described in item 8 of the scope of patent application, wherein the fixing member has an outer surface, the outer surface of the fixing member and the outer surface of the first link face the same direction, and the outer surface of the fixing member The surface has a contour line. When the bicycle rear derailleur is installed on the frame, the outer surface of the fixing member faces away from the wheel. When the chain guide member is in the first position, the outer surface of the fixing member The contour line of the surface and the contour line of the outer surface of the second connecting rod match each other, and there is a gap between the contour line of the outer surface of the fixing member and the contour line of the outer surface of the second connecting rod A gap, and the maximum width of the gap between the contour line of the fixing member and the contour line of the second link is between 0.3 mm and 3.5 mm. For the bicycle rear derailleur described in claim 9, wherein the maximum width of the gap between the contour line of the fixing member and the contour line of the second link is preferably 0.5 mm to Between 2.0 mm. The bicycle rear derailleur described in item 9 of the scope of patent application, wherein the The ratio of the maximum width value to the minimum width value of the gap between the contour line of the fixing member and the contour line of the second connecting rod is less than 3.5. For the bicycle rear derailleur described in claim 11, the ratio of the maximum width value to the minimum width value of the gap between the contour line of the fixing member and the contour line of the second link is preferably Less than 2.5. In the bicycle rear derailleur described in item 9 of the scope of patent application, the length of the gap between the contour line of the fixing member and the contour line of the second link is greater than 15 mm. As for the bicycle rear derailleur described in item 13 of the scope of patent application, the length of the gap between the contour line of the fixing member and the contour line of the second link is preferably greater than 25 mm. The bicycle rear derailleur described in item 1 of the scope of patent application further includes a power source, the second link includes a housing and a cover, the cover is fixed to the housing, the cover and the housing A accommodating space is formed together, one of the contour lines is located on the cover, the power source is arranged in the accommodating space, and the power source is used to drive the connecting rod assembly and the movable member. For example, the bicycle rear derailleur described in claim 15 further includes a transmission assembly, a first linkage member and a second linkage member. The transmission assembly includes a plurality of transmission gears and a transmission rod. The transmission gears are located at The accommodating space is connected to each other, one of the transmission gears is connected to the power source, one end of the transmission rod is located in the accommodating space and connected to the other transmission gear, and the other end of the transmission rod is located in the accommodation Outside the space, the first link is fixed to a part of the transmission rod outside the accommodating space, and the second link passes through the movable member and abuts against the first link. For example, the bicycle rear derailleur described in item 16 of the scope of patent application further includes a stopper and an elastic member. The stopper is pivoted to the movable member, one end of the elastic member is fixed to the movable member, and the elastic member The other end abuts against the stopper, and the stopper abuts against the first linkage. The bicycle rear derailleur described in claim 15 further includes a circuit board located in the accommodating space and electrically connected to the power source, and the circuit board is closer to the cover than the power source. For example, the bicycle rear derailleur described in item 1 of the scope of patent application further includes a battery fixing member and a battery. The fixing member has a battery assembly part, the battery fixing part is pivoted on the battery assembly part, and the battery fixing part The battery is fixed together with the battery assembly part. For the bicycle rear derailleur described in item 19 of the scope of patent application, the battery fixing member has a fixing structure, and the fixing structure is detachably locked with the battery assembly part. A bicycle rear derailleur, which is installed on a frame and is located beside a wheel, comprises: a fixed member for installation on the frame; a movable member; and a connecting rod assembly including a first connecting rod and A second link, two opposite ends of the first link are respectively pivoted to the fixed member and the movable member, and two opposite ends of the second link are respectively pivoted to the fixed member and the movable member; and The chain guide member is pivoted on the movable member; wherein, driven by the link assembly and the movable member, the chain guide member can be located at a first position relatively far away from the wheel or relatively close to a first position of the wheel Two When the chain guide member is in the first position, the fixing member and the second connecting rod are matched with two adjacent contour lines respectively, and there is a gap between the two contour lines. For the bicycle rear derailleur described in item 21 of the scope of patent application, the maximum width of the gap is between 0.3 mm and 3.5 mm. For the bicycle rear derailleur described in item 22 of the scope of patent application, the maximum width of the gap is preferably between 0.5 mm and 2.0 mm. For the bicycle rear derailleur described in item 21 of the scope of patent application, the ratio of the maximum width to the minimum width of the gap is less than 3.5. For the bicycle rear derailleur described in item 24 of the scope of patent application, the ratio of the maximum width to the minimum width of the gap is preferably less than 2.5. For the bicycle rear derailleur described in item 21 of the scope of patent application, the length of the gap is greater than 15 mm. In the bicycle rear derailleur described in item 26 of the scope of patent application, the length of the gap is preferably greater than 25 mm.

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