bicycle rear derailleur

Abstract

Rear derailleur (12) comprising: a basic element (40), configured to be mounted on a bicycle (10); a movable element.(42), movably coupled to the base element (40); a chain guide (44) coupled to the movable element (42) to rotate around an axis of rotation (A) in relation to the movable element (42); a friction element (70) arranged between the movable element (42) and the chain guide (44) to provide frictional resistance to rotation in a first direction of rotation (D1) of the chain guide (44); an adjusting screw (72) provided to adjust the frictional resistance of the friction element (70); a one-way coupling (74) arranged between the moving element (42) and the chain guide (44) to engage with the friction element (70) when the chain guide (44) rotates in the first direction of rotation (D1); an electric actuator (76) operatively coupled to the one-way clutch (74) to control the one-way clutch (74) between a disengaged mode and an engaged mode, wherein the electric actuator (76) has a motor (90) having an output shaft (92) and a mode switching part (88) which is operatively coupled to the output shaft (92) of the motor (90) to switch the one-way clutch (74) between the engaged mode and the disengaged mode independently of the set friction resistance.

Description

REFERENCE TO RELATED REGISTRATIONS

[0001] The present application claims priority over US application number US 13 / 752622, the contents of which are incorporated herein by reference. BACKGROUND Area of ​​the invention

[0002] This invention relates generally to a rear derailleur for a bicycle. More precisely, the present invention relates to a rear derailleur which is provided with a friction element between the moving element and the chain guide. Background information

[0003] A typical bicycle rear derailleur is used to selectively move a chain from one of a number of sprockets to another, thus changing the bicycle's gears. A typical bicycle rear derailleur has a base element suitable for mounting on the bicycle frame, a moving element that is movably coupled to the base element, and a chain guide that is coupled to the moving element. The chain guide engages with and guides the chain in such a way that it can selectively shift the chain among the multiple sprockets as the moving element moves relative to the base element.

[0004] The chain guide of a rear derailleur is usually rotatably mounted to the moving element and is spring-tensioned in a clockwise direction so that it can absorb or compensate for chain slack when the chain engages with the smaller diameter sprockets. However, riding over uneven terrain, jumps, or impacts can cause the chain guide to rotate counterclockwise, resulting in unwanted chain slack. To prevent this, some derailleurs incorporate anti-rotation mechanisms. An example of such a mechanism is disclosed in US patent application US 2009 / 0054183A1.As shown there, a bicycle derailleur comprises a base element suitable for mounting on a bicycle, a movable element movably coupled to the base element, and a chain guide coupled to the movable element. The chain guide is coupled for rotation around an axis of rotation, and a pretensioning element pretensions the chain guide in a selected direction of rotation around the axis of rotation. A resistance unit applies resistance to the rotation of the chain guide in a direction opposite to the selected direction of rotation, and an adjustment unit sets the amount or magnitude of the resistance applied by a friction element of the resistance unit.

[0005] German document DE 10 2011 114 699 A1 discloses a controllable one-way coupling with a manually adjustable cam for adjusting the friction of a friction element of a one-way coupling.

[0006] The American document US 2009 / 0291789A1 discloses a motor coupling that counteracts the movement of a chain guide in order to maintain chain tension.

[0007] The purpose of the present application is to provide a rear derailleur in which a friction rotation or friction resistance of a friction element can be adjusted even when a one-way clutch is controlled between an engaged mode and a disengaged mode. OVERVIEW OF THE INVENTION

[0008] The problem described above is solved by the independent claims; preferred embodiments are specified in the dependent claims.

[0009] In general, the present invention relates to various features of a bicycle rear derailleur.

[0010] In accordance with a first aspect of the present invention, a rear derailleur is proposed to solve the aforementioned problem, which essentially comprises a base element, a movable element, a chain guide, a friction element, a slip clutch or one-way clutch, an electric actuator, and an adjusting screw. The base element is configured and intended to be mounted on a bicycle. The movable element is movably coupled to the base element. The chain guide is coupled to the movable element to rotate about an axis of rotation with respect to the movable element. The friction element is operatively arranged between the movable element and the chain guide to provide rotational resistance in a first direction of rotation of the chain guide by friction or by means of a frictional force. The slip clutch is operatively arranged between the movable element and the chain guide to engage with the friction element.to interact with these when the chain guide rotates in the first direction. The electric actuator is operatively coupled to the one-way clutch to control the one-way clutch between a clutch mode (engaged mode) and a disengaged mode (disengaged mode). The adjusting screw is designed to set the frictional resistance of the friction element. The electric actuator has a motor with an output shaft and a mode switching component, which is operatively coupled to the motor's output shaft to switch the slip clutch between the engaged and disengaged modes, regardless of the set frictional resistance.

[0011] In accordance with a second aspect of the present invention, the rear derailleur is configured according to the first aspect such that the electric actuator is mounted on the movable element.

[0012] Preferably, the rear derailleur is configured such that the electric actuator still has a reduction unit which connects the motor's output shaft to the mode switching part.

[0013] Another aspect of the present invention relates to a rear derailleur comprising: a basic element, configured to be mounted on a bicycle; a movable element, movably coupled to the base element; a chain guide, coupled to the moving element, to rotate around an axis of rotation in relation to the moving element; a friction element, arranged between the movable element and the chain guide, to provide frictional resistance to rotation in a first direction of rotation of the chain guide; a one-way coupling, operatively arranged between the moving element and the chain guide, to engage with the friction element when the chain guide rotates in the first direction of rotation; an electric actuator, operatively coupled to the one-way clutch, to control the one-way clutch between a disengaged mode and an engaged mode; wherein the electric actuator has a mode switching part and a coil which is operatively coupled to the mode switching part to switch the one-way clutch between the engaged mode and the disengaged mode; and wherein the electric actuator has a holder connected to the coil, moving in a direction parallel to the extension direction of the axis of rotation, and the mode switching part has a control ring, wherein the control ring rotates about the axis of rotation when the coil moves the holder in the direction parallel to the extension direction of the axis of rotation.

[0014] Preferably, the rear derailleur is configured such that the electric actuator continues to have a cam structure, which is formed at least on one of the control ring and the holder.

[0015] Preferably, the rear derailleur is configured such that the first direction of rotation is a counterclockwise direction of rotation around the chain guide about the axis of rotation when viewed along the axis of rotation of the moving element from a side facing away from the bicycle frame.

[0016] Preferably, the rear derailleur has a preload element which preloads the movable element towards a low shifting position in relation to the base element.

[0017] The rear derailleur according to a preferred embodiment further comprises a switching motor which is operatively coupled to the moving element in order to move the moving element in a lateral direction with respect to the base element.

[0018] The rear derailleur according to a preferred embodiment further comprises a controller connected to the electric actuator to control the electric actuator between an engaged or coupled position, which controls the slip clutch into the engaged or coupled mode, and an uncoupled position, which controls the slip clutch into the uncoupled mode.

[0019] Preferably, the rear derailleur is configured such that the controller controls the electric actuator from the coupled position to the uncoupled position when the chain guide moves in a lateral direction with respect to the base element from a first shift position to a second shift position.

[0020] Preferably, the rear derailleur is configured so that the controller moves the electric actuator into the engaged position when the chain guide is not shifted.

[0021] The rear derailleur is configured so that the controller repeatedly attempts to move the electric actuator to the uncoupled position after a set time interval has elapsed without receiving a signal; which is the next shift position reached after a gear change command has been issued.

[0022] Preferably, the rear derailleur is configured such that the controller repeatedly attempts to control the electric actuator into the engaged state when a current from the electric actuator is detected that exceeds a set current level, which occurs during a gear change.

[0023] Preferably, the rear derailleur further comprises an actuator position sensor, which is arranged to detect an actuation position of the electric actuator. The controller sets or changes an output voltage to a switching motor, which is operatively coupled to the moving element, in order to move the moving element in a lateral direction relative to the base element when the actuator position sensor indicates that the actuation position of the electric actuator is the engaged position during a switching operation.

[0024] The rear derailleur according to a preferred embodiment further comprises an actuator position sensor arranged to detect an actuation position of the electric actuator. The controller actuates or controls the electric actuator from the engaged position to the disengaged position when the actuator position sensor indicates that the actuation position of the electric actuator is the engaged position after a gear-shift command has been issued.

[0025] Preferably, the rear derailleur is configured such that the controller repeatedly attempts to control the electric actuator from the engaged position to the disengaged position when the actuator position sensor indicates that the operating position of the electric actuator is the engaged position.

[0026] Preferably, the rear derailleur is configured so that the controller issues a warning that the electric actuator is malfunctioning when a set number of attempts is reached.

[0027] Preferably, the rear derailleur is configured so that the controller moves the electric actuator from the engaged position to the disengaged position when the bicycle speed is below a set speed.

[0028] Other tasks, features, aspects and advantages of the disclosed rear derailleur will become apparent to the person skilled in the art from the following detailed description, which, in conjunction with the accompanying drawings, discloses selected embodiments of the rear derailleur. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Reference is now made to the attached drawings, which form part of these original revelations: Fig. Figure 1 is a side view of a bicycle comprising a plurality of rear sprockets and a bicycle rear derailleur, in accordance with an embodiment shown; Fig. 2 is a perspective view of a steering rod area of ​​the in Fig. 1. Bicycle shown, with a controller and switches mounted on a straight handlebar or mountain bike handlebar; Fig. Figure 3 is an enlarged partial side view of a section of the in Fig. 1 rear derailleur shown; Fig. 4 is a perspective view from a direction opposite the frame of the object in Fig. 3 rear derailleur shown, wherein the rear derailleur is in the low actuation position when a chain is not engaged; Fig. 5 is a top view of the outer four-bar linkage and the inner components of the motor unit of the in Fig. 3 and Fig. 4 rear derailleurs shown; Fig. 6 is a partial side view of a rear section of the in Fig. 3 and Fig. 4 rear derailleur shown, with a cover element of the movable element removed; Fig. Figure 7 is a partial sectional view of the moving element of the in Fig. 3 and Fig. 4 rear derailleurs shown; Fig. Figure 8 is a perspective view of a roller cage of the one-way or roller coupling of the in Fig. 3 and Fig. 4 rear derailleurs shown; Fig. 9 is a cross-sectional view of the roller cage of the in Fig. 3 and Fig. 4 rear derailleurs shown; Fig. Figure 10 is a perspective view of the friction element from a side opposite the frame, showing the slip clutch and the electric actuator of the Fig. 3 and Fig. The 4 rear derailleurs shown are visible; Fig. Figure 11 is a side view of the friction element from a direction opposite the frame, with the slip clutch and the electric actuator shown in Fig. 10 are shown with the slip clutch in an engaged mode; Fig. 12 is a side view of the friction element from a side opposite the frame, showing the slip clutch and the in Fig. 9 and Fig. Figure 10 shows an electric actuator with the slip clutch in a decoupled mode; Fig. Figure 13 is a partially enlarged perspective view of a section of the roller cage of the slip clutch and a section of the mode switching part in which the slip clutch is in the engaged mode. Fig. Figure 14 is a partially enlarged cross-sectional view of a section of the roller cage of the slip clutch and a section of the mode switching part in which the slip clutch is in an engaged mode; Fig. Figure 15 is a partially enlarged perspective view of a section of the roller cage of the slip clutch and a section of the mode switching part in which the slip clutch is in the disengaged mode; Fig. Figure 16 is a partially enlarged cross-sectional view of a section of the cage of the slip clutch and a section of the mode switching part in which the slip clutch is in the disengaged mode; Fig. Figure 17 is a perspective view of the electric actuator with an alternative mode switching part seen from an opposite side of the frame, for switching the slip clutch between the uncoupled mode and the coupled mode; Fig. Figure 18 is a simplified view of the electric actuator with the alternative mode switching part, in which the slip clutch is in the engaged mode; Fig. Figure 19 is a simplified view of the electric actuator with the alternative mode switching part, in which the slip clutch is in the disengaged mode; Fig. Figure 20 is a first flowchart showing exemplary control processes that are carried out by the controller of the rear derailleur; Fig. Figure 21 is a second flowchart showing exemplary control processes that are carried out by the rear derailer controller; Fig. Figure 22 is a third flowchart, showing exemplary control operations performed by the rear derailleur controller; and Fig. 23 is a fourth flowchart, showing exemplary control operations performed by the rear derailleur controller, DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0030] Selected embodiments are explained below with reference to the drawings. It is evident to the person skilled in the art from this disclosure that the descriptions of the embodiments given below are for illustrative purposes only and not for the purpose of limiting or restricting the invention as defined by the attached claims and their equivalents.

[0031] Initially referring to Fig. Figure 1 shows a bicycle 10, which has a rear derailleur 12 in accordance with an illustrated embodiment. In the illustrated embodiment, the rear derailleur 12 is an electrically controlled derailleur, which is part of a bicycle drivetrain 12. The drivetrain 12 essentially comprises a front crankset 16, an electrically controlled front derailleur 18, a set of rear sprockets 20, and a chain 22.

[0032] As can be seen in Fig. 2 A bicycle control unit 24 is mounted on a handlebar 26 of the bicycle 10. The bicycle control unit 24 is electrically connected to the rear derailleur 12 and the front derailleur 18 to issue commands or control signals to control or actuate the rear derailleur 12 and the front derailleur 18. An electrical switch 28 is mounted on the handlebar 26 to actuate the rear derailleur 12 either directly or via the bicycle control unit 24. An electrical switch 30 is attached to the handlebar 26 to actuate the front derailleur 18 either directly or via the bicycle control unit 24.While the electrical switches 28 and 30 are electrically connected to the bicycle control unit 24 for issuing commands or control signals to the bicycle control unit 24, the electrical switches 28 and 30 can each be configured to communicate wirelessly with the bicycle control unit 24 and / or the rear derailleur 12 or the front derailleur 18.

[0033] The bicycle control unit 24 interprets and executes instructions (data, signals, and commands) from the various programs and hardware to direct or control the operation of the rear derailleur 12 and the front derailleur 18, as well as other components, as required and / or desired. The bicycle control unit 24 includes a microcomputer with a processor and memory for processing the various signals from different sensors and components of the bicycle 10. While the bicycle control unit 24 is shown as a simple, separate unit, it can also be part of another component or part of several components (e.g., multiple controllers attached to different parts).

[0034] In the illustrated embodiment, the bicycle 10 further comprises a speed sensor 32, which is mounted on a section (e.g., a front fork) of the bicycle 10. The speed sensor 32 detects a magnet 34 mounted on the spokes of the front wheel of the bicycle 10. The speed sensor 32 can, for example, be a Hall effect sensor or a reed (magnetic) switch, which detects the magnet 34 when the front wheel of the bicycle 10 and the magnet 34 pass in the vicinity of the speed sensor 32. The signal from the speed sensor 32 is output to the bicycle control unit 24 either wirelessly or via a wire (not shown).

[0035] In the illustrated embodiment, the bicycle control unit 24 is preferably provided with both a manual shifting mode and an automatic shifting mode. While the rear derailleur 12 and the front derailleur 18 are shown as being used with the bicycle control unit 24, it is apparent to those skilled in the art from this disclosure that the bicycle control unit 24 can be removed so that the rear derailleur 12 and the front derailleur 18 are controlled directly by the respective electrical switches 28 and 30.

[0036] With reference to the Fig. Sections 3 to 6 below discuss the rear derailleur 12 in more detail. The rear derailleur 12 is secured to a rear section of a bicycle frame 36 by a mounting screw 28 in a conventional manner. The rear derailleur 12 is actuated by the electric switch 28, which is a shifting device. The electric switch 28 actuates the rear derailleur 12 between a multitude of shifting (gear) positions, so that the chain 22 is moved by the rear derailleur 12 in a lateral direction between the rear sprockets 20. The rear derailleur 12 is in a low shifting (gear) position in Fig. Figure 3 illustrates this. As used here, the term "low shift position" refers to the rear derailleur 12 being actuated so that the chain 22 is guided onto the rear sprocket 20 with the largest number of teeth. As further used here, the term "upper shift position" refers to the rear derailleur 12 being in an actuated position corresponding to the chain 16 being guided onto the rear sprocket 20 with the smallest number of teeth.

[0037] As can be seen in Fig. 3 and Fig. The rear derailleur 12 essentially comprises a base element 40, a movable element 42, and a chain guide 44. The base element 40 is configured and designed to be attached to the bicycle 10 by means of the mounting screw 38. The movable element 42 is movably coupled to the base element 40. The chain guide 44 is relatively conventional and has a pair of rollers P1 and P2. The chain guide 44 is coupled to the movable element 42 to rotate about an axis of rotation A with respect to the movable element 42. Consequently, the chain guide 44 rotates about the axis of rotation A with respect to the movable element 42 when the movable element 42 is moved between the different shift positions. In the illustrated embodiment, the rear derailleur 12 further comprises a first or outer coupling member 46 and a second or inner coupling member 48 for the movable connection of the movable element 42 to the base element 40.The outer and inner coupling elements 46 and 48 have first ends which are pivotably coupled to the base element 40 and second ends which are pivotably connected to the movable element 42 to form a four-bar linkage arrangement.

[0038] As best seen in Fig. 4 The rear derailleur 12 further comprises a first preload element 50, which preloads the movable element 52 towards a low shift position with respect to the base element 40. In the illustrated embodiment, the first preload element 50 is a tension coil spring, which has a first element 50a, which is connected to the outer coupling member 46, and a second end 50b, which is connected to the inner coupling member 48.

[0039] As can be seen in Fig. The rear derailleur 12 further comprises a switching motor 52, which is operatively coupled to a movable element 42 via the outer coupling element 46 in order to move the movable element 42 in a lateral direction relative to the base element 40. The switching motor 52 is a reversible electric motor. The rear derailleur 12 further comprises a controller which controls the actuation or operation of the switching motor 52. The switching motor 52 is part of a motor unit which is mounted on the base element 40. In the illustrated embodiment, the motor unit further comprises a reduction unit 56 and a switching state position sensor 58.

[0040] The switching motor 52 is connected to the outer coupling link 46 via the reduction unit 56. Specifically, the outer coupling link 46 is connected to one end of an output shaft 60 of the reduction unit 56. Rotation of the output shaft 60 in a first or forward direction moves the movable element 42 and the chain guide 44 to an upper switching state position relative to the base element 40. Rotation of the output shaft 60 in a second or reverse direction moves the movable element 42 of the chain guide 44 to a lower switching state position relative to the base element 40. Alternatively, the inner coupling link 46 can be coupled to one end of an output shaft 60 of the reduction unit 56.

[0041] As can be seen in Fig. In the illustrated embodiment, the switching state sensor 58 is formed by a position aperture wheel and a dual-channel photointerrupter. The dual-channel photointerrupter of the switching state position sensor 58 is electrically connected to the controller. The switching state position sensor 58 generates a switching position signal based on the rotation of the position aperture wheel. In particular, the position aperture wheel is rotated by rotating the reduction unit 56, which in turn is rotated by the switching motor 52. Consequently, the rotation of the position aperture wheel is indicative of the magnitude or length of the movement of the chain guide 44 by or due to the actuation of the switching motor 52. The dual-channel photointerrupter has a light source (e.g., an LED) and a light detector (e.g., a phototransistor). The light source (e.g., an LED) is arranged on one side of the aperture wheel. The light detector (e.g., a phototransistor) is located on the other side of the position aperture wheel.A phototransistor is located on the opposite side of the aperture wheel. Light from the light source passes through circumferentially spaced openings in the aperture wheel when the aperture wheel is rotated. The light passing through the opening in the aperture wheel is then detected as pulsed light or light pulses by the light detector to determine the rotational path or circumference of the rotary motion of the output shaft 60 by the reduction unit 56. Consequently, the switching state position sensor 58 generates a switching position signal and outputs it to the controller. The switching state position sensor 58 is not limited to the illustrated embodiment. Other types of switching state position sensors can be used, such as potentiometers, resistive position sensors, optical position sensors, contact switches, Hall effect sensors, MR sensors, etc.

[0042] As can be seen in Fig. 6 and Fig. 7 The chain guide 44 is fixedly attached to a rotation axis 62, which in turn is rotatably connected to the movable element 42. In other words, the chain guide 44 is mounted to the movable element 42 by means of the rotation axis 62 for rotation around the axis of rotation A. For assembly purposes, the rotation axis 62 is preferably constructed from several sections which are removablely connected to one another. Likewise, although not shown, bushings and / or bearings are provided between the movable element 42 and the rotation axis 62.

[0043] In the illustrated embodiment, the rear derailleur 12 has a rotational resistance application unit 68, which includes a friction element 70 that provides resistance to a rotational movement of the chain guide in a second direction of rotation, opposite to the first direction of rotation. In this case, the friction element 70 is a belt friction element. Preferably, the rotational resistance (friction of the rotational resistance application unit 68) is adjustable. Consequently, in the illustrated embodiment, an adjusting screw 72 is provided for compressing the free ends of the friction element 70 to achieve the desired frictional resistance.

[0044] In the illustrated embodiment, the friction element 70 is arranged between the movable element 42 and the chain guide 44 to provide frictional resistance in a first direction of rotation D1 of the chain guide 44 when the chain guide 44 rotates about the axis of rotation A. The first direction of rotation D1 is a counterclockwise rotation of the chain guide 44 about the axis of rotation A when viewed along the axis of rotation A from a side of the movable element 42 not facing the frame. More precisely, the rear derailleur 12 has a slip clutch or one-way clutch 74, which is operatively arranged between the movable element 44 and the chain guide 44 to engage with the friction element 70 when the chain guide 44 rotates in the first direction of rotation D1.In the illustrated embodiment, the rear derailleur 12 has an electric actuator 76 which is operatively coupled to the slip clutch 74 in order to control the slip clutch 74 between a coupled or engaged mode and a disengaged mode.

[0045] As can be seen in Fig. 7 A second pretensioning element 78 pretensions the chain guide 44 around the axis of rotation A in a second direction of rotation D2 around the axis of rotation A, which is opposite to the first axis of rotation D1. Consequently, the second direction of rotation, D2, is a clockwise direction of rotation of the chain guide 44 around the axis of rotation A when viewed along the axis of rotation A from the side of the movable element 44 not facing the frame. In the illustrated embodiment, the second pretensioning element 78 is a torsion spring which has a first end arranged in an opening of the movable element 42 and a second end arranged in an opening of the chain guide 44.

[0046] In the illustrated embodiment, as can be seen in Fig. 6, the slip clutch 74 is arranged between the friction element 70 and the axis of rotation 62. The friction element 70 provides resistance to the rotational movement of the chain guide 44 in the first direction of rotation D1 with respect to the movable element 42. In particular, the friction element 70 provides frictional resistance to the rotational movement of the chain guide 44 by applying frictional resistance to the rotation of the slip clutch 74. A protective cover is mounted on the movable element 42 to enclose and protect the slip clutch and the friction element 70 from the environment.

[0047] With reference to Fig. 6, Fig. 8 and Fig. In this embodiment, the axis of rotation 62 forms an inner ring or track of the slip clutch 74. The slip clutch 74 further comprises an outer ring or track 80, a plurality of rollers 82, and a roller cage. The friction element 74 applies friction to an outer circumferential surface of the outer ring 80 of the slip clutch 74 when the chain guide 44 and the axis of rotation 62 rotate in the first direction D1 with respect to the movable element 42. Consequently, in this embodiment, the slip clutch 74 is a roller slip clutch that is engaged, active, and transmits when the chain guide 44 and the axis of rotation 62 rotate in the first direction D1 with respect to the movable element 42, and is disengaged and does not transmit when the chain guide 44 and the axis of rotation 62 rotate in the second direction D2 with respect to the movable element.Consequently, the chain guide 44 and the axis of rotation 62 can rotate freely with respect to the movable element 42 without the application of the rotational resistance of the friction element 74 when the chain guide 44 and the axis of rotation 62 rotate in the second direction of rotation D2 with respect to the movable element 42.

[0048] The roller cage 84, as can be seen in Fig. Figure 8 essentially comprises a first cage ring 84a, a second cage ring 84b, a plurality of cage struts 84c, and a spring assembly 84d. Since the slip clutch 74 is disclosed in detail in US application number US 2012 / 0083371A1, the slip clutch 74 will not be described in detail here.

[0049] With reference to Fig. At points 6, 7, and 10 to 16, the electric actuator 76 is fixedly mounted to the movable element 42, and the slip clutch 74 is further equipped with a mode switching part 88. Essentially, the controller is connected to the electric actuator 76 to control the electric actuator 76, which switches the mode switching part 88 between an engaged position, which moves the slip clutch 74 into the engaged mode, and a disengaged position, which moves the slip clutch 74 into the disengaged mode. The mode switching part 88 switches the slip clutch 74 between an engaged mode and a disengaged mode. In the engaged mode, the slip clutch 78 can be actuated such that the friction element 70 applies resistance to the axis of rotation 62 when the chain guide 44 rotates in the first direction of rotation D1 with respect to the movable element 42, but not in the second direction of rotation D2.In disengaged mode, the slip clutch 74 is in operative or non-acting mode, so that the friction element 70 exerts no resistance on the axis of rotation 62 when the chain guide 44 rotates in either the first direction of rotation D1 or the second direction of rotation D2 with respect to the movable element.

[0050] In the embodiment of the Fig. 6, 7 and 10 to 16, the electric actuator 76 has a motor 90 with an output shaft 92, which is operatively coupled to the mode switching unit 88 for switching the slip clutch 74 between the engaged mode and the disengaged mode. The electric actuator 76 further has a reduction unit 94, which connects the output shaft 92 of the motor 90 to the mode switching unit 88. In the illustrated embodiment, the electric actuator is electrically connected to the controller. The controller outputs signals, as discussed below, to control the actuation of the electric actuator 76 in order to selectively switch the slip clutch 74 between the engaged mode and the disengaged mode.

[0051] As can be seen in Fig. Figures 10 to 12 show that the mode switching part 88 has a gear 88a which engages with one of the gears of the reduction unit 94, so that the rotation of the output shaft 92 of the motor 90 is transmitted to the gear 88a of the mode switching part 88. The gear 88 is rotatably mounted on the axis of rotation 62. The mode switching part 88 also has a plurality of connecting pins 88b (only one shown in Figure 10). Fig. 13 to 16) and a variety of prestressing elements 88c (only one shown in Fig. 13 to 16). The connecting pins 88b and the preload elements 88c are arranged in pockets on the side of the outer ring 80 facing the frame. The preload elements 88c preload the connecting pins 88b into contact with the side of the gear 88 facing away from the frame. The gear 88a and the second cage ring 84b are attached to each other such that the cage ring 84b rotates when the gear 88a is rotated. The gear 88a changes the relative angular position between the second cage ring 84b and the outer ring 80. The gear 88a has a plurality of holes 88d for the selective reception of the connecting pins 88b. As can be seen in Fig. 13 and Fig. 14, the mode switching part 88 places the slip clutch 74 in the engaged mode when the connecting pins 88b are not engaged with the holes 88d of the gear 88a. In particular, when the connecting pins 88e are not engaged with the holes 88d of the gear 88a, the second cage ring 84b of the roller cage 84 of the slip clutch 74 can rotate to effectively couple the outer ring of the slip clutch 74 to the axis of rotation 62 when the axis of rotation 62 rotates in the first direction of rotation D1 with respect to the movable element 42. Consequently, the friction element 70 exerts a rotational resistance on the axis of rotation 62 when the axis of rotation 62 rotates in the first direction of rotation D1 with respect to the movable element 42, when the connecting pins 88b are not engaged with the holes 88d of the gear 88a.

[0052] On the other hand, the mode switching part 88 places or brings the slip clutch 74 into the disengaged mode, as can be seen in Fig. 15 and Fig. 16, when the connecting pins 88b are engaged with the holes 88d of the gear 88a. In particular, when the connecting pins 88b are engaged with the holes 88d of the gear 88a, the second cage ring 84b of the roller cage 84 of the slip clutch 74 cannot rotate to effectively couple the outer ring 80 of the slip clutch 74 with the axis of rotation 62. Consequently, the rollers 82 cannot move into a position to effectively couple the outer ring 80 of the slip clutch 74 with the axis of rotation 62 when the axis of rotation 62 rotates in the first direction of rotation D1 with respect to the movable element 42. Consequently, the friction element 70 exerts no rotational resistance on the axis of rotation 62 when the axis of rotation 62 rotates in the first direction of rotation D1 with respect to the movable element 42, when the connecting pins 88b are engaged with the holes 88d of the gear 88a,

[0053] Preferably, the rear derailleur 12 further comprises an actuator position sensor 96, which is arranged to detect the actuation position of the electric actuator 76. The actuator position sensor 96 is electrically connected to the controller and indicates whether the slip clutch 74 is in either the disengaged or engaged mode. Consequently, the controller receives signals from the actuator position sensor 96 so that the controller can determine whether the slip clutch 74 is in either the engaged or disengaged mode. Preferably, as described below, the controller actuates the electric actuator 76 from the engaged position to the disengaged position when the actuator position sensor 96 indicates that the actuation position of the electric actuator 76 is in the engaged position after a gear shift command has been issued.

[0054] In the present case, the actuator position sensor 96 is shown detecting the rotational movement of the gear 88a. However, the actuator position sensor 96 is not limited to this arrangement in the illustrated embodiment. The actuator position sensor 96 can equally well detect the rotational movement of one of the gears of the reduction unit 94, or of another moving part of the electric actuator 76, which indicates whether the slip clutch 74 is in either the engaged or disengaged mode.

[0055] For example, as shown, the actuator position sensor 96 has a magnetic signal receiver which has one or more detection elements that detect a magnet 98 on the gear 88. However, the actuator position sensor 96 is not limited to a magnetic type of detection as in the illustrated embodiment. Other types of position sensors can also be used, such as potentiometers, resistive position sensors, optical position sensors, contact switches, etc. Consequently, the actuator position sensor 96 can be a contact sensor or a non-contact sensor, as required and / or desired.

[0056] In the Fig. In the embodiment shown in Figures 17 to 19, an alternative electric actuator 76' is shown, which replaces the electric actuator 76. Essentially, the electric actuator 76' operates in a similar manner to the electric actuator 76 described above in order to switch the slip clutch 74 between the engaged mode and the disengaged mode. Fig. 17 and Fig. Figure 18 shows the electric actuator 76' in a engaged position such that the slip clutch 74 (see Fig. 6, Fig. 8 and Fig. 9) is in the engaged mode. Fig. Figure 19 shows the electric actuator 76 in a disengaged position such that the slip clutch 74 (see Fig. 6, Fig. 8 and Fig. 9) is in the disengaged mode. In the present case, the electric actuator 76' has a mode switching part 88' and a coil 90'. The coil 90' is operatively coupled to the mode switching part 88' to switch the slip clutch 74 between the engaged mode and the disengaged mode. In particular, the electric actuator 76 further has a holder 100, which is connected to the coil 90' via an intermediate element 92', so that together they move in a direction parallel to the axis of rotation A. In the present case, the holder has an outer sleeve 102, an inner sleeve 104, and a plurality of connecting pins 106. The connecting pins 106 couple the outer sleeve 102 and the inner sleeve 104 together. The mode switching part 88' has a control ring 108 which is rotated around the axis of rotation A when the coil 90' moves the holder 100 in the direction parallel to the axis of rotation A.In the present case, for example, the control ring 108 is rotatably arranged between the outer sleeve 102 and the inner sleeve 104. The control ring 108 is attached to the second cage ring 84b. The electric actuator 76' further comprises a cam structure formed on at least one of the control ring 108 and the holder 102. In the present case, for example, the control ring 108 has a plurality of cam slots 110. The cam slots 110 form a cam structure which interacts with the connecting pins 106 to rotate the control ring 108 when the holder 100 moves in the direction parallel to the axis of rotation A. Essentially, the control ring 108 rotates when the mode switching part 88' is disengaged from the engaged position, as shown in [Figure 1]. Fig. 17 and Fig. 18, into the disengaged position, as can be seen in Fig. 9 rotates, the second cage ring 84b in the second direction of rotation D2. Consequently, the rotation of the second cage ring 84b locks the slip clutch 74 in the disengaged mode so that the axis of rotation 62 can rotate freely without resistance from the friction element 70.

[0057] With reference to Fig. Section 20 below describes a first control sequence or procedure, executed by the controller, for controlling the mode of the slipper clutch 74 for downshifting (i.e., the chain 22 moves to a larger of the sprockets 20) of the rear derailleur 12. This control sequence is executed when the controller receives a shift signal from either the bicycle control unit 24 or the electrical switch 28. As mentioned above, the shift signal can be generated by the bicycle control unit 24 based on one or more operating states of the bicycle 10 if an automatic shifting mode is selected. Alternatively, the shift signal can be generated by the rider, who operates the electrical switch 28.

[0058] In the course of the Fig. The actuator position sensor 96 can be omitted. Consequently, the rear derailleur 12 can be built more compactly and less expensively than a derailleur which has a position sensor for detecting the engaged and disengaged positions of the electric actuator 76.

[0059] In step S1, the controller controls the electric actuator 76 so that the slip clutch 74 is switched from the engaged mode (i.e., the slip clutch 74 is active or engaged) to the disengaged mode (i.e., the slip clutch is not active or engaged). The sequence then proceeds to step S2.

[0060] In step S2, the controller activates the shifting motor 52 to rotate the output shaft 60 of the reduction unit 56 such that the outer and inner coupling links 46 and 48, the movable element 42, and the chain guide 44 move laterally and sideways, respectively, with respect to the base element 40. Consequently, the rear derailleur 12 is moved from the current shift position to a target shift position.

[0061] Consequently, as a result of the processes or activation of steps S1 and S2, the controller moves the electric actuator 76 from the engaged position to the disengaged position when the chain guide 44 moves laterally relative to the base element 40 from a first (current) switching position to a second (target) switching position. The process then switches to step S3.

[0062] In step S3, the controller determines whether the current level of the switching motor 52 is above a defined current level. If the current level of the switching motor 52 is above a defined current level, the controller determines that the friction element 70 is still applying rotational resistance to the axis of rotation 62. Consequently, it is determined that the slip clutch 74 is still engaged, and the sequence proceeds to step S4.

[0063] In step S4, the controller stops the switching motor 25, and then the sequence changes to step S5, in which the controller again activates the electric actuator 70 to switch the slip clutch 74 from the engaged to the disengaged position. Consequently, if the chain guide 44 is not switched, the controller moves the electric actuator 76 to the engaged position as a result of the processes in steps S4 and S5. The sequence then changes to step S6.

[0064] In step S6, the controller increments a current counter value "N" by one. In other words, the controller has a counter that counts the number of attempts it made to shift into the target gear position before the sequence ends.

[0065] After step S6, the sequence switches to step S7, in which the controller compares the current counter value "N" with a preset counter value "N1". If the current counter value "N" is equal to or greater than the preset counter value "N1", the sequence terminates. However, if the current counter value "N" is less than the preset counter value "N1", the sequence jumps back to S2. In this way, the controller repeatedly attempts to engage the electric actuator 76 whenever the current of the electric actuator 76 exceeds the preset current level during a gear change. In other words, the controller's counter is used to determine how many times the sequence has been repeated to perform the shift to the target gear position before the sequence terminates.

[0066] The controller has a preset counter value "N1", which corresponds to a maximum number of attempts to repeatedly shift into the target gear position before the sequence is terminated. This preset counter value "N1" can also be adjusted to a desired value by the rider or another person using the bicycle control unit 24, a personal computer connected directly to the rear derailleur 12, an adjustment device provided on the rear derailleur 12, or in any other desired manner.

[0067] In step S3, the process switches to step S8 if the controller detects that the current level of the switching motor 52 is equal to or below the set current level, if the controller has detected that the slip clutch 74 is in the disengaged mode.

[0068] In step S8, the controller determines whether the target shift (gear) position has been reached within a defined time period, using the shift position sensor 58. If not, the controller executes steps S4 to S7 as described above. As a consequence of the processes in steps S6, S7, and S8, the controller repeatedly attempts to move the electric actuator 76 to the displaced position if a set time period has elapsed without receiving a signal that a subsequent shift position has been reached after issuing a gear shift command.

[0069] However, the sequence changes to step S9 when, in step S8, the controller determines that the target shift (gear) position has been reached within the set time period.

[0070] In step S9, the controller stops the switching motor 52 and then switches to step S10, in which the controller controls the electric actuator 76 so that the slip clutch is switched from the disengaged mode to the engaged mode. Then the sequence ends.

[0071] With reference to the Fig. 21 A second or alternative control sequence will be discussed below, which is executed by the controller to control the mode of the slipper clutch 74 when downshifting (i.e., the chain 22 moves to a larger of the sprockets 22) of the rear derailleur 12. This control sequence is executed when the controller receives a shift signal from either the bicycle control unit 24 or the electrical switch 28, as described above.

[0072] In step S20, the controller controls the electric actuator 76 to switch the slip clutch 74 from the engaged mode to the disengaged mode, then the sequence changes to step S21.

[0073] In step S21, the controller determines whether the signal from the actuator position sensor 96 indicates that the slip clutch 74 is in disengaged mode. If not, the sequence proceeds to step S22, in which the controller increases the voltage output of the switching motor 52 so that the switching motor 52 can complete the switching operation with the increased force required due to the rotational resistance applied to the axis of rotation 62 by the friction element 70. In other words, the controller sets or changes (i.e., increases) the voltage output to the switching motor 52, which is operatively coupled to the moving element 42 via the coupling elements 46 and 48, in order to move the moving element 42 laterally or axially.to move laterally with respect to the base element 40 when the actuator position sensor 96 indicates that the actuation position of the electric actuator 76 is in the engaged position during a switching operation. In this way, switching can be carried out reliably when the slip clutch 74 is in the engaged position such that the friction element 70 applies frictional resistance to the axis of rotation 62. The sequence then proceeds to step 23.

[0074] The sequence also switches to step S23 when the controller detects that the signal from the actuator position sensor 96 indicates that the slip clutch 74 is in the disengaged mode. In step S23, the controller activates the shift motor 52 to rotate the output shaft 60 of the reduction unit 56 so that the outer and inner coupling links 46 and 48 move the movable element 42 and the chain guide 44 laterally and sideways, respectively, with respect to the base element 40. Consequently, the rear derailleur 12 is moved from its current shift (gear) position to a target shift (gear) position. The sequence then switches to step S24.

[0075] In step S24, the controller controls the electric actuator 76 so that the slip clutch 74 is switched from disengaged mode to engaged mode. Then the sequence ends.

[0076] With reference to the Fig. 22 A third or alternative control sequence is explained, which is executed by the controller, to control the mode of the slip clutch 74 for downshifting (i.e. the chain 22 is moved to a larger of the sprockets 20) of the rear derailleur 12. This control sequence is executed when the controller receives a shift signal from either the bicycle control unit 24, or the electrical switch 28, as explained above.

[0077] In step S30, the controller controls the electric actuator 76 to switch the slip clutch 74 from the engaged mode to the disengaged mode. The sequence then changes to step S31.

[0078] In step S31, the controller determines whether the signal from the actuator position sensor 96 indicates that the slip clutch 74 is in the disengaged mode. If this is the case, the sequence proceeds to step S32.

[0079] In step S32, the controller activates the shifting motor 52 to rotate the output shaft 60 of the reduction unit 56 so that the outer and inner coupling links 46 and 48, the movable element 42, and the chain guide 44 move laterally relative to the base element 40. Consequently, the rear derailleur 12 is moved from its current shift position to a target shift position. The sequence then proceeds to step S33.

[0080] In step S33, the controller controls the electric actuator 76 to switch the slip clutch from the disengaged mode to the engaged mode, then the process ends.

[0081] However, if, in step S31, the signal from the actuator position sensor 96 indicates that the slip clutch 74 is still in the engaged mode, the sequence changes to step S34, in which the controller increments the current counter value "N" by one. The sequence then changes to step S35, in which the controller compares the current counter value "N" with a set counter value "N1". If the current counter value N is equal to or greater than the set counter value "N1", the sequence changes to step S36, in which the controller issues a message indicating that the electric actuator 76 has a malfunction. The sequence then ends.

[0082] Consequently, in the course of the Fig. 22 The controller will display a warning that the electric actuator is malfunctioning when a preset number of repetitions is reached. The warning that the electric actuator 76 is malfunctioning can be seen on the display of the bicycle control unit 24 (see Fig. 2) are represented. Preferably, each time the electric actuator 76 malfunctions, the malfunction data is stored in the memory of the controller and / or the bicycle control unit 24. The malfunction data of the electric actuator 76 can then subsequently be read out by an external computer (PC) via a cable or wirelessly.

[0083] On the other hand, the sequence reverts to step S30 if, in step S35, the counter "N" is below the set counter value "N1": Consequently, the controller repeats the attempts to switch the electric actuator 76 from the engaged position to the disengaged position when the actuator position sensor 96 indicates that the operating position of the electric actuator 76 is in the engaged position. As a consequence of the actuations of steps S30, S31, S34, and S35, the controller moves the electric actuator 76 from the engaged position to the disengaged position when the actuator position sensor 96 indicates that the operating position of the electric actuator 76 is in the engaged position after a gear shift command has been issued.

[0084] With reference to Fig. Section 23 below describes a fourth or alternative control sequence, executed by the controller, to control the mode of the slip clutch 74 based on the vehicle speed or bicycle speed. This control sequence is executed continuously when the rear derailleur 12 is supplied with power.

[0085] In step S40, the controller determined whether the bicycle's speed was below a preset speed, using speed sensor 32. If not, the process repeated step S40.

[0086] If the controller detects that the bicycle's speed exceeds the preset speed value, the sequence switches to step S23, in which the controller controls the electric actuator 76 so that the slip clutch 74 is switched from the engaged mode to the disengaged mode. The sequence then ends.

[0087] In the course of the Fig. 23. When the bicycle speed is below a predetermined speed value, the frictional resistance on the axis of rotation 62 is not required under a high rotational load P, since it is unlikely that the chain guide 44 will rotate and consequently cause undesirable chain slack 22. Therefore, the controller moves the electric actuator 76 from the engaged position to the disengaged position when the detected speed value is below a set speed value. By switching the slip clutch 74 to the disengaged mode at low speeds, less energy is consumed during low-speed shifting.

[0088] Regarding the understanding of the scope of the present invention, the term "comprise" and its derivatives, as used herein, are to be understood as open terms that specify the presence of the mentioned features, elements, components, groups, integers, and / or steps, but do not exclude the presence of other unmentioned features, elements, components, groups, integers, and / or steps. The foregoing also applies to words with similar meanings, such as the terms "exhibit," "with," "have," and their derivatives. Furthermore, the terms "part," "section," "section," "link," or "element," when used in the singular, can have the plural meaning of a single part or a plurality of parts.

[0089] As used above to describe the embodiment(s), the following directional terms "front", "rear", "above", "below", "vertical", "horizontal", "below" and "transverse", as well as any other directional or positional indications, refer to a bicycle upright and equipped with the rear derailleur 12. Accordingly, these terms used to describe the rear derailleur 12 are to be understood as referring to a bicycle equipped with the rear derailleur 12 in a normal riding position on a flat surface.

[0090] It should also be understood that while the terms "first" and "second" in this description are used to explain different components, these components are not intended to be limited by these terms. These terms are used solely to distinguish one component from another. Therefore, for example, a first component described above can be called a second component without deviating from the disclosure of the present invention.

[0091] The term "coupled" or "coupling," as used here, encompasses configurations in which one element is directly secured to another by attaching the element directly to the other element; configurations in which the element is indirectly attached to the other element by attaching the element to intermediate elements or an intermediate element which is in turn attached to the other element; and configurations in which one element is integrally formed with another element, i.e., one element is essentially part of the other. This definition can also be applied to words with similar meanings, such as "connected," "attached," "mounted," "glued," "fixed," and so on.

[0092] Finally, terms of magnitude such as "essentially", "about" and "approximately" as used here have the meaning of a deviation from the term they denote, so that the final result is not significantly changed.

[0093] While only selected embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without deviating from the scope of the invention as defined in the appended claims. For example, the size, shape, location, or orientation of the various components can be changed as desired and / or required, provided that they do not thereby substantially depart from their intended function. Components shown to be directly connected to one another may have intermediate structures between them unless specifically stated otherwise. The function of one element can be achieved by two and vice versa unless specifically stated otherwise.The structures and functions of one embodiment can be transferred to another embodiment. It is not necessary for all advantages or features to be present simultaneously in every embodiment. Any feature that differs from the prior art, alone or in combination with other features, shall also be considered a separate description of further inventions by the applicant, including the structural and / or functional concepts embodied by such feature(s). Therefore, the preceding descriptions of exemplary embodiments according to the present invention are given for illustrative purposes only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

Claims

[1] Rear derailleur (12) comprising: a basic element (40), configured to be mounted on a bicycle (10); a movable element.(42), movably coupled to the base element (40); a chain guide (44) coupled to the movable element (42) to rotate around an axis of rotation (A) in relation to the movable element (42); a friction element (70) arranged between the movable element (42) and the chain guide (44) to provide frictional resistance to rotation in a first direction of rotation (D1) of the chain guide (44); an adjusting screw (72) provided to adjust the frictional resistance of the friction element (70); a one-way coupling (74) arranged between the moving element (42) and the chain guide (44) to engage with the friction element (70) when the chain guide (44) rotates in the first direction of rotation (D1); an electric actuator (76) operatively coupled to the one-way clutch (74) to control the one-way clutch (74) between a disengaged mode and an engaged mode, wherein the electric actuator (76) has a motor (90) having an output shaft (92) and a mode switching part (88) which is operatively coupled to the output shaft (92) of the motor (90) to switch the one-way clutch (74) between the engaged mode and the disengaged mode independently of the set frictional resistance. [2] Rear derailleur (12) according to claim 1, wherein the electric actuator (76;) is mounted on the movable element (42). [3] Rear derailleur (12) according to claim 1 or claim 2, wherein the electric actuator (76) further comprises a reduction unit (56) which connects the output shaft (92) of the motor (90) to the mode switching part (88). [4] Rear derailleur (12) comprising: a basic element (40), configured to be mounted on a bicycle (10); a movable element (42), movably coupled to the base element (40); a chain guide (44) coupled to the movable element (42) to rotate around an axis of rotation (A) in relation to the movable element (42); a friction element (70) arranged between the movable element (42) and the chain guide (44) to provide frictional resistance to rotation in a first direction of rotation (D1) of the chain guide (44); a one-way coupling (74) arranged between the moving element (42) and the chain guide (44) to engage with the friction element (70) when the chain guide (44) rotates in the first direction of rotation (D1); an electric actuator (76') operatively coupled to the one-way clutch (74) to control the one-way clutch (74) between a disengaged mode and an engaged mode, wherein the electric actuator (76') has a mode switching part (88') and a coil (90') which is operatively coupled to the mode switching part (88') to switch the one-way clutch (74) between the engaged mode and the disengaged mode, and wherein the electric actuator (76') has a holder (100) which is connected to the coil to move in a direction parallel to the axis of rotation (A), and the mode switching part (88') of the one-way coupling (74) has a control ring (108) which rotates around the axis of rotation (A) when the coil (90') moves the holder (100) in the direction parallel to the axis of rotation (A). [5] Rear derailleur (12) according to claim 4, wherein the electric actuator (76') further comprises a cam structure which is formed at least on one of the control ring (108) and the holder (100). [6] Rear derailleur (12) according to any one of claims 1 to 5, wherein the first direction of rotation (D1) is a counterclockwise direction of rotation of the chain guide (44) around the axis of rotation (A) when viewed along the axis of rotation (A) of the movable element (42) from a side facing away from the frame (36). [7] Rear derailleur (12) according to one of claims 1 to 6 further comprising a preloading element (50) which preloads the movable element (42) towards a low shifting position in relation to the base element (40). [8] Rear derailleur (12) according to one of claims 1 to 7, further comprising a switching motor (52) which is operatively coupled to the movable element (42) to move the movable element (42) in a lateral and / or sideways direction with respect to the base element (40). [9] Rear derailleur (12) according to any one of claims 1 to 8 further comprising a controller which is connected to the electric actuator (76; 76') to control the electric actuator (76; 76') between an engaged position which controls the one-way clutch (74) into the engaged mode and an unengaged position which controls the slip clutch (74) into the unengaged mode. [10] Rear derailleur (12) according to claim 9, wherein one or more of the following are fulfilled: a) the controller controls the electric actuator (76; 76') from the engaged position to the disengaged position when the chain guide (44) moves in a lateral and / or sideways direction with respect to the base element (40) from a first switching position to a second switching position; b) the controller controls the electric actuator (76; 76') into the engaged position when the chain guide (44) is not switched; The controller repeats the attempts to move the electric actuator (76; 76') to the disengaged position after a set time interval has elapsed without receiving a signal, indicating that a subsequent switching position has been reached after a gear-shift command has been issued; d) the controller repeatedly attempts to control the electric actuator (76; 76') into the engaged state when a voltage of the electric actuator (76; 76') is detected that exceeds a preset voltage value during a switching operation; and e) The controller controls the electric actuator (76; 76') from the engaged position to the disengaged position when it is detected that a bicycle speed is below a preset speed value. [11] Rear derailleur (12) according to one of claims 9 or 10 further comprising an actuator position sensor (96) arranged to detect an actuation position of the electric actuator (76; 76'), wherein the controller either sets an output voltage at a switching motor (52) which is operatively coupled to the movable element (42) to move the movable element (42) in a lateral and / or sideways direction with respect to the base element (40) when the actuator position sensor (96) indicates that the actuation position of the electric actuator (76; 76') corresponds to the engaged position during a switching operation, or controls the electric actuator (76; 76') from the engaged position to the disengaged position when the actuator position sensor (96) indicates that the actuation position of the electric actuator (76; 76') corresponds to the engaged position The engaged position corresponds to the position after a gear change command has been issued. [12] Rear derailleur (12) according to claim 11, wherein the controller repeatedly attempts to control the electric actuator (76; 76') from the engaged position to the disengaged position when the actuator position sensor (96) indicates that the actuation position of the electric actuator (76; 76') corresponds to the engaged position. [13] Rear derailleur (12) according to claim 12, wherein the controller issues a warning that the electric actuator (76; 76') has a malfunction when a predetermined number of attempts is reached.

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