Electric front derailleur

Abstract

The utility model discloses an electric front derailleur, which comprises a base component, a chain guide part, a chain guide plate, a chain guide plate and a chain guide plate, the connecting mechanism comprises a first connecting piece and a second connecting piece which are arranged front and back, the first connecting piece is connected with the base component in a pivoted mode and connected with the inner guide chain plate in a pivoted mode, and the second connecting piece is connected with the base component in a pivoted mode and connected with the inner guide chain plate in a pivoted mode. The coupling mechanism is configured to move the chain guide in a front-back direction and thus between a retracted position and an extended position when the base member is mounted to a bicycle frame; and the motor driving part is arranged above the connecting mechanism and the chain guiding piece, and an operation shaft of the motor driving part is rotatably connected with the chain guiding piece so as to drive the chain guiding piece to move in the front-back direction. By adopting the structural design, the size of the electric front derailleur can be reduced.

Description

Technical Field

[0001] The utility model relates to a derailleur for a bicycle, in particular to an electric front derailleur which can be installed on a bicycle frame. Background Art

[0002] A common bicycle has a front sprocket set consisting of one or more sprockets and a rear sprocket set consisting of one or more sprockets mounted on a rear wheel axle. The bicycle chain is mounted to one sprocket in the front sprocket set and one sprocket in the rear sprocket set respectively. A front derailleur mounted on the bicycle triangular frame can guide the chain to one sprocket in the front sprocket set, and a rear derailleur mounted on the rear fork of the bicycle frame can guide the chain to one sprocket in the rear sprocket set.

[0003] CN104176193A discloses a front derailleur, including a base member, a chain guide, and a linkage mechanism pivotally connected between the chain guide and the base member. The base member is configured to be fixedly connected to a bicycle, the chain guide is configured to guide a chain, and the linkage mechanism connects the chain guide to the base member in a manner that the chain guide can move between a retracted position and an extended position in response to the movement of an operating cable. When the chain guide moves from the retracted position to the extended position in response to the movement of the operating cable, the linkage mechanism moves away from the base member in a rearward direction.

[0004] US2013 / 0192405 discloses a bicycle electric transmission system, including a battery, a pair of electric transmissions mounted on the handlebars, and a front derailleur mounted on the bicycle frame. The front derailleur includes a base member, a chain guide, an inner link member and an outer link member, wherein the inner link member and the outer link member have a first end pivotally mounted to the base member and a second end pivotally mounted to the chain guide, and the base member, the chain guide, the inner link member and the outer link member are configured. A bicycle electric drive device is supported on the base member. The chain guide is operably connected to the electric drive part of the electric drive device. The chain guide moves between a retracted position and an extended position through the electric drive part of the electric drive device. In the front derailleur, the inner link member, the outer link member and the base member are configured as a parallelogram linkage mechanism in a vertical direction, wherein the parallelogram linkage mechanism extends along the tube length direction of the seat tube of the bicycle frame. The electric drive unit is arranged above the parallelogram linkage mechanism. The vertical parallelogram linkage mechanism and the electric drive unit and housing located above the vertical parallelogram linkage mechanism make the overall volume of the electric front derailleur relatively large. Therefore, it is desirable to design an electric front derailleur with a smaller volume. Summary of the invention

[0005] In order to solve the above technical problems, the utility model provides an electric front derailleur, which can reduce the volume of the electric front derailleur.

[0006] According to an embodiment of the utility model, an electric front derailleur is provided, comprising:

[0007] a base member mountable to a bicycle frame;

[0008] a chain guide configured to guide a chain, the chain guide comprising an inner chain guide plate and an outer chain guide plate, the inner chain guide plate being closer to the base member than the outer chain guide plate;

[0009] The linkage is configured to connect the chain guide to the bicycle frame in a forward and backward manner, and the linkage is configured to connect the chain guide to the bicycle frame in a forward and backward manner, and the second end of the first linkage is pivotally connected to the base member, and the second end of the first linkage is pivotally connected to the inner chain guide plate, the first end of the second linkage is pivotally connected to the base member, and the second end of the second linkage is pivotally connected to the inner chain guide plate, the linkage is configured to move the chain guide in a forward and backward direction and thus move between an extended position and a retracted position when the base member is installed to the bicycle frame; and a motor drive unit is configured to be above the linkage and the chain guide, the motor drive unit includes an electric motor and an operating shaft driven by the electric motor, the operating shaft is rotatably connected to the chain guide to drive the chain guide to move in the forward and backward direction.

[0010] Optionally, the coupling mechanism is configured such that when the base member is mounted to the bicycle frame, a movement plane of the chain guide forms an angle with a horizontal plane, so that the chain guide moves along an upper front and lower rear direction and thus moves between the extended position and the retracted position.

[0011] Optionally, the base member includes a first connecting portion and a second connecting portion arranged in a front-to-rear manner, and a drive accommodating portion located above the first connecting portion and the second connecting portion; the first end of the first connecting member is pivotally connected to the first connecting portion via a first pivot, the second end of the first connecting member is pivotally connected to the inner chain guide plate via a second pivot, the first end of the second connecting member is pivotally connected to the second connecting portion via a third pivot, the second connecting member is pivotally connected to the inner chain guide plate via a fourth pivot, the first pivot, the second pivot, the third pivot and the fourth pivot are parallel to each other; and the motor driving portion is placed on the drive accommodating portion.

[0012] Optionally, the connecting mechanism also includes a third connecting member located above the first connecting member and the second connecting member, the first end of the third connecting member is rotatably connected to the operating shaft of the motor drive unit, and the second end of the third connecting member is pivotally connected to the chain guide.

[0013] Optionally, the base member includes a mounting structure extending vertically upward from the drive receiving portion; and when the electric front derailleur is mounted to the bicycle frame via the mounting structure, the axes of the first pivot, the second pivot, the third pivot and the fourth pivot, which are parallel to each other, form an obtuse angle with the axis of the seat tube of the bicycle frame.

[0014] Optionally, a through hole is formed at the first end of the third connecting member, and the operating shaft extends from the top of the through hole into the through hole for a certain distance; the drive accommodating portion is provided with a third connecting portion, and the third connecting portion has a circular protrusion, and the first end of the third connecting member is placed on the third connecting portion, and the circular protrusion extends from the bottom of the through hole into the through hole for a certain distance.

[0015] Optionally, the chain guide comprises a fixed connection member arranged between the top end of the inner chain guide plate and the top end of the outer chain guide plate, and the third connection member is pivotally connected to the fixed connection member.

[0016] Optionally, the motor drive unit also includes a shell, the shell includes a lower shell and an upper shell, the electric motor is arranged in the shell, and the operating shaft extends out of the lower shell; and the electric front derailleur also includes a power module, and the power module is arranged above the upper shell to supply power to the motor drive unit.

[0017] Optionally, the motor drive unit further includes a control module and a gear transmission device arranged in the shell for controlling the rotation of the electric motor, the gear transmission device includes a multi-stage gear, a first-stage gear in the multi-stage gear is directly connected to the output end of the electric motor, and the output of the electric motor causes the first-stage gear in the multi-stage gear to rotate; and the gear transmission device and the electric motor are arranged below the control module.

[0018] Optionally, when the chain guide is in the retracted position, a portion of the chain guide is closer to the bicycle frame than the motor driving part, or a side of the chain guide closer to the bicycle frame is flush with a side of the motor driving part closer to the bicycle frame.

[0019] With the electric front derailleur of the utility model, since the first connecting member, the second connecting member, the base member and the chain guide member are constructed into a parallelogram connecting rod mechanism substantially along a horizontal plane, a smaller electric front derailleur can be designed and manufactured. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic diagram of an electric front derailleur installed on a bicycle frame according to an embodiment of the utility model.

[0021] Figure 2 It is a schematic diagram from an outer side perspective of an electric front derailleur according to an embodiment of the utility model.

[0022] Figure 3 It is a schematic diagram of an inner side view of an electric front derailleur according to an embodiment of the utility model.

[0023] Figure 4 It is a schematic diagram of an exploded structure of an electric front derailleur according to an embodiment of the utility model.

[0024] Figure 5 It is a partial structural schematic diagram of an electric front derailleur according to an embodiment of the utility model.

[0025] Figure 6 is a diagram of the chain guide in the retracted position in an electric front derailleur.

[0026] Figure 7 is a diagram of the chain guide in an electric front derailleur in the extended position.

[0027] Figure 8 yes Figure 5 The schematic diagram of the partial structure without the base component is shown.

[0028] Fig. 9 The figure is a schematic structural diagram of a motor driving unit of an electric front derailleur according to an embodiment of the present invention.

[0029] Fig.10 2 is another structural schematic diagram of the motor driving unit of the electric front derailleur according to an embodiment of the utility model.

[0030] Fig.11 It is a schematic diagram of the chain guide of the electric front derailleur moving along the upper front and lower rear according to an embodiment of the utility model.

[0031] Reference numerals:

[0032] 10-Electric front derailleur;

[0033] 20-base member; 22-first connecting portion; 24-second connecting portion; 26-drive accommodating portion; 28-third connecting portion; 30-chain guide; 32-inner chain guide plate; 321-first upper support member; 323-first lower support member; 325-second upper support member; 327-second lower support member; 34-outer chain guide plate; 36-fixed connecting member;

[0034] 40-connecting mechanism; 42-first connecting member; 44-second connecting member; 46-third connecting member;

[0035] 50-motor drive unit; 52-housing; 521-upper housing; 522-middle housing; 523-lower housing; 53-control module; 54-electric motor; 56-gear transmission device; 561-first gear; 562-second gear; 563-third gear; 564-fourth gear; 565-output gear; 566-radial magnet; 57-position sensor chip; 58-operating shaft;

[0036] 61 - axis of the first pivot; 62 - axis of the second pivot; 63 - axis of the third pivot; 64 - axis of the fourth pivot; 65 - axis of the fifth pivot; 66 - bolt;

[0037] 70-power module;

[0038] 101 - horizontal plane marking line; 102 - reference plane marking line for movement of the chain guide; 103 - equivalent horizontal height line when the chain guide is in the extended position; 104 - equivalent horizontal height line when the chain guide is in the retracted position. DETAILED DESCRIPTION

[0039] The technical solutions of the embodiments will be described clearly and completely below in conjunction with the drawings of the specification of the present application. Those skilled in the art will understand that the embodiments described in the specification are only part of the embodiments of the invention of the present utility model, rather than all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present utility model.

[0040] In the description of this patent specification, the directions or positional relationships indicated by "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "longitudinal", "lateral", "center", "vertical", "horizontal", "length", "width", "thickness", "clockwise", "counterclockwise" and so on are as follows: Figure 1 The orientation of the electric derailleur when mounted on the bicycle frame is shown as a reference, and the direction of the chain travel is forward. These orientations and positional relationships are only for the convenience of describing the embodiments involved in the technical innovation of the utility model, and cannot be understood as limiting the scope of protection of the claims. In addition, those skilled in the art will understand that the terms "first" and "second" used in this specification to describe various components are only to distinguish one component from another, and have no meaning of order, and the corresponding components should not be limited by these terms.

[0041] In the present invention, the bicycle may be any type of bicycle, such as a mountain bike, a road bike, etc. The electric front derailleur includes a sprocket configured to guide the bicycle chain between a plurality of sprockets in response to a shifting operation. Figure 1 As shown, the electric front derailleur can be mounted to the seat tube of a bicycle frame. Figure 2-Figure 10 As shown, the electric front derailleur 10 includes a base member 20, a chain guide 30, a coupling mechanism 40 and a motor drive portion 50. The base member 20 can be mounted to a bicycle frame. The chain guide 30 is configured to guide a chain. The coupling mechanism 40 movably couples the chain guide 30 to the base member 20, wherein the coupling mechanism 40 is configured to drive the chain guide 30 to move in the front-rear direction relative to the base member 20 and to move the chain guide 30 between an extended position and a retracted position.

[0042] The base member 20 includes a first connection portion 22 and a second connection portion 24 at the bottom, and a drive accommodating portion 26 at the top. The first connection portion 22 and the second connection portion 24 are arranged in a front-to-back manner and are spaced a certain distance apart. The drive accommodating portion 26 at the top is higher than the first connection portion 22 and the second connection portion 24 by a certain height.

[0043] The coupling mechanism 40 includes a first connecting member 42 and a second connecting member 44 located at a lower portion, and a third connecting member 46 located at an upper portion. The chain guide 30 includes an inner chain guide plate 32 close to the base member 20 and an outer chain guide plate 34 located farther from the base member 20 than the inner chain guide plate 32. The motor drive portion 50 includes a housing 52, an electric motor 54, and an operating shaft 58 driven by the electric motor 54. The electric motor 54 is disposed in the housing 52, and a portion of the operating shaft 58 extends out of the housing 52.

[0044] The first connecting member 42 includes a first end and a second end. The first end of the first connecting member 42 is arranged to be pivotally connected to the first connecting portion 22 of the base member 20 through a first pivot, so that the first connecting member 42 can rotate around the axis 61 of the first pivot. The second end of the first connecting member 42 is pivotally connected to the inner chain guide plate 32 through a second pivot. For example, the inner chain guide plate 32 is provided with a first connecting structure and a second connecting structure on a side facing the base member 20, and the first connecting structure and the second connecting structure are arranged front and back and spaced a certain distance apart. The second end of the first connecting member 42 is connected to the first connecting structure of the inner chain guide plate 32 through a second pivot. The first connecting structure includes a first upper support member 321 and a first lower support member 323, and the second end of the first connecting member 42 is arranged between the first upper support member 321 and the first lower support member 323, and the second pivot passes through the through holes on the first upper support member 321, the first connecting member, and the first lower support member 323 in sequence, so that the first connecting member 42 can rotate around the axis 62 of the second pivot.

[0045] The second connecting member 44 includes a first end and a second end. The first end of the second connecting member 44 is provided with an opening to accommodate the second connecting portion 24 of the base member 20. The first end of the second connecting member 44 is pivotally connected to the second connecting portion 24 of the base member 20 through a third pivot, so that the second connecting member 44 can rotate around the axis 63 of the third pivot. The second end of the second connecting member 44 is pivotally connected to the inner chain guide plate 32 through a fourth pivot 64. Specifically, the second end of the second connecting member 44 is connected to the second connecting structure of the inner chain guide plate 32 through the fourth pivot 64. As shown in the figure, the second connecting structure includes a second upper support member 325 and a second lower support member 327, the second end of the second connecting member 44 is arranged between the second upper support member 325 and the second lower support member 327, and the fourth pivot 64 passes through the through holes of the second upper support member 325, the second end of the second connecting member 44, and the second lower support member 327 in sequence, so that the second connecting member 44 can rotate around the axis 64 of the fourth pivot.

[0046] The first connecting member 42 is arranged in front of the second connecting member 44, and the first connecting member 42 is spaced a certain distance from the second connecting member 44. In the embodiment of the utility model, the first connecting member 42, the second connecting member 44, the base member 20 and the chain guide member 30 are configured to form a parallelogram linkage mechanism in the horizontal direction, that is, a parallelogram linkage mechanism viewed from top to bottom.

[0047] The base member 20 includes a drive accommodating portion 26 located above the first connection portion 22 and the second connection portion 24 for accommodating the motor drive portion 50 disposed thereon. The drive accommodating portion 26 is spaced a certain distance from the first connection portion 22 and the second connection portion 24 in the height direction.

[0048] The coupling mechanism 40 includes a third connecting member 46, which is arranged above the first connecting member 42 and the second connecting member 44. The third connecting member 46 includes a first end and a second end. A through hole is formed at the first end of the third connecting member 46. The portion of the operating shaft 56 extending out of the housing extends from above the through hole into the through hole of the third connecting member 46 and fits therewith. The first end of the third connecting member 46 can rotate around the operating shaft 56.

[0049] In an optional embodiment, a third connecting portion 28 is provided on the driving accommodation portion 26. A circular protrusion (not shown) is provided on the third connecting portion 28, and the diameter of the circular protrusion is smaller than the inner diameter of the through hole of the first end of the first connecting member 42. The first end of the third connecting member 46 is placed on the third connecting portion 28. The circular protrusion extends into the through hole from the bottom of the through hole for a certain distance, so that when the third connecting member 46 drives the chain guide 30, it rotates around the protrusion on the third connecting portion 28 as the axis. In this way, the deviation of the rotation axis when the third connecting member 46 drives the chain guide 30 can be reduced, and finally the chain guide 30 can be parallelly moved relative to the frame or the chain chainring.

[0050] The second end of the third connecting member 46 is pivotally connected to the chain guide 30 via a fifth pivot, so that the third connecting member 46 can rotate around the axis of the fifth pivot. A chain guide groove is formed between the inner chain guide plate 32 and the outer chain guide plate 34 of the chain guide 30 for guiding the bicycle chain. The top end of the inner chain guide plate 32 and the top end of the outer chain guide plate 34 are connected by a fixed connecting member 36. Optionally, the fixed connecting member 36 can also be formed integrally with the inner chain guide plate 32 and the outer chain guide plate 34. The fifth pivot passes through the through hole on the second end of the third connecting member 46 and the through hole on the fixed connecting member of the chain guide 30 to pivotally connect the third connecting member 46 to the chain guide 30.

[0051] In the prior art, the traditional connection mechanism is a double-link mechanism, i.e., an inner link and an outer link. The operating shaft of the motor drive unit is located at the rotating shaft of one of the links. In order to avoid the operating shaft from being in a vacant position and affecting stability, the structure of this type of connection mechanism requires external reinforcement of the operating shaft, such as increasing the thickness of the motor drive unit housing, increasing the diameter and length of the operating shaft, and strengthening the structure of the base member connected to the operating shaft. This will increase the size of the electric front derailleur and make it look bulky.

[0052] In the embodiment of the utility model, the linkage mechanism is a three-link structure, and the stability of the linkage mechanism can be improved by this three-link structure. Since the linkage mechanism designed in the present application has high stability, the volume of the electric drive part, the first connecting part of the base member and the first connecting member of the linkage mechanism can be greatly reduced.

[0053] In other optional embodiments, since the first connecting member 42, the second connecting member 44, the base member 20 and the chain guide 30 have formed a parallelogram linkage mechanism, the third connecting member 46 can also be omitted, and the operating shaft 58 can be directly rotatably connected to the chain guide 30.

[0054] The base member 20 includes a mounting structure. The base member 20 is mounted to the bicycle frame tube by the mounting structure. As shown, the mounting structure includes a mounting post extending vertically upward from the drive receiving portion, and the mounting structure is fixed to the universal mounting position of the bicycle frame tube by a fixing bolt 66 and a fixing washer in a conventional manner. Alternatively, the frame can be installed with a universal fastening ring, and the base member 20 is connected to the universal fastening ring by bolts 66 to be mounted to the bicycle tube frame.

[0055] like Figure 3 As shown, the housing 52 of the motor driving unit 50 includes an upper housing 521, a middle housing 522 and a lower housing 523. The electric front derailleur 10 further includes a power supply module 70, which is disposed above the upper housing 521 to supply power to the motor driving unit. The operating shaft 58 driven by the electric motor 54 extends out of the lower housing 523.

[0056] like Figure 4 , 9 As shown in Figures 10 and 10, the motor drive unit 50 also includes a control module 53 and a gear transmission device 56 disposed in the housing 52. The gear transmission device 56 and the electric motor 54 are disposed below the microcontroller 53. The control module 53 includes a microcontroller and a motor driver chip that interacts with the microcontroller. The rotation direction of the output shaft of the electric motor 54 is controlled by the microcontroller through the driver chip of the electric motor 54. The forward or reverse rotation of the motor determines whether the final chain guide 30 performs an upshift or downshift adjustment function. The gear transmission device 56 includes a plurality of gears, and each gear interacts with the adjacent gears. The first gear 561 is directly connected to the output end of the electric motor 54. As shown in Figures 10 and 10, the motor drive unit 50 also includes a control module 53 and a gear transmission device 56. Figure 9-10 As shown, the output of the electric motor 54 causes the primary gear 561 to rotate, the primary gear 561 drives the secondary gear 562 to rotate together, the secondary gear 562 drives the tertiary gear 563 to rotate together, the tertiary gear 563 drives the quaternary gear 564 to rotate together, and the quaternary gear 564 drives the output gear 565 to rotate together. One end shaft of the output gear 565 (i.e., the operating shaft 58) extends out of the housing 52 and extends into the through hole of the first end of the third connecting member 46, so that the output gear 565 rotates together with the third connecting member 46.

[0057] When the motor 54 rotates, Fig. 9 The radial magnet 566 shown will rotate with the four-stage gear 564. At this time, the position sensor chip 57 set on the control module 53 reads the rotation angle of the radial magnet 566 to know the angle between the output gear 565 and the third connecting member 16, and then know the accurate position of the chain guide 30. The microcontroller is integrated with a wireless radio frequency transceiver unit to receive external operation instructions. When the new position of the chain guide 30 is determined by the received shift instruction, the microcontroller outputs a corresponding rotation signal to start the electric motor 54 to rotate. When the chain guide 30 reaches the new position, the microcontroller cuts off the signal to the electric motor 54 and cuts off the power of the electric motor driving chip. Thereby, accurate control of the chain guide 30 is achieved.

[0058] Figure 6 A schematic diagram is shown showing the chain guide 30 in a retracted position. Figure 7 FIG. 2 shows a schematic diagram of the chain guide 30 in an extended position. In the embodiment shown in the figure, the second connection structure (the second upper support member 325 and the second lower support member 327) of the chain guide 30 is at least partially closer to the bicycle frame than the base 20. Since the motor drive unit 50 is disposed above the drive accommodation portion of the base 20, Fig. 9As shown, a portion of the chain guide 30 is closer to the bicycle frame than the motor drive unit 50. This can make the electric front derailleur more compact and smaller in size. Optionally, when the chain guide 30 is in the retracted position, it is also feasible that the inner side of the chain guide 30 is flush with the inner side of the motor drive unit 50.

[0059] In the preferred embodiment of the present utility model, Fig.11 As shown in FIG. 1 , when the electric front derailleur 10 is mounted on the seat tube of the bicycle frame, the seat tube is inclined, the base member 20 is perpendicular to the seat tube, and the operating shaft 58 extending from the motor drive portion 50 on the base member 20 is perpendicular to the fixed connecting member 36 at the upper end of the chain guide 30, so the movement plane of the chain guide forms a certain angle with the horizontal plane, see FIG. Fig.11 The horizontal plane marking line 101 and the reference plane marking line 102 for the movement of the chain guide are shown. In this way, when the chain guide 30 moves in the front-rear direction, it also moves up and down relatively in the direction perpendicular to the horizontal plane, see the equivalent horizontal height line 103 of the chain guide 30 in the extended position and the equivalent horizontal height line 104 of the chain guide 30 in the retracted position. The difference in equivalent horizontal height between the extended position and the retracted position of the chain guide is generally in the range of 1-3 mm.

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric front derailleur comprising: A base member, which can be mounted to a bicycle frame; a chain guide, which is configured to guide a chain, the chain guide comprising an inner chain guide plate and an outer chain guide plate, the inner chain guide plate being closer to the base member than the outer chain guide plate; a coupling mechanism, which movably couples the chain guide to the base member; characterized in that: The coupling mechanism includes a first coupling member and a second coupling member, the first coupling member and the second coupling member are arranged in a front-to-rear manner and spaced a certain distance apart, a first end of the first coupling member is pivotally connected to the base member, a second end of the first coupling member is pivotally connected to the inner chain guide plate, a first end of the second coupling member is pivotally connected to the base member, and a second end of the second coupling member is pivotally connected to the inner chain guide plate, the coupling mechanism is configured to move the chain guide in a front-to-rear direction and thus move between an extended position and a retracted position when the base member is mounted to the bicycle frame; and The motor driving part is arranged above the connecting mechanism and the chain guide, and the motor driving part includes an electric motor and an operating shaft driven by the electric motor, and the operating shaft is rotatably connected to the chain guide to drive the chain guide to move in the front-rear direction.

2. The electric front derailleur according to claim 1, characterized in that: The coupling mechanism is configured such that when the base member is mounted to the bicycle frame, the movement plane of the chain guide forms an angle with the horizontal plane, so that the chain guide moves along the upper front and lower rear and thus moves between the extended position and the retracted position.

3. The electric front derailleur according to claim 2, characterized in that: The base member includes a first connection portion and a second connection portion arranged in a front-to-rear manner, and a drive accommodating portion located above the first connection portion and the second connection portion; The first end of the first connecting member is pivotally connected to the first connecting portion via a first pivot, the second end of the first connecting member is pivotally connected to the inner chain guide plate via a second pivot, the first end of the second connecting member is pivotally connected to the second connecting portion via a third pivot, the second connecting member is pivotally connected to the inner chain guide plate via a fourth pivot, and the first pivot, the second pivot, the third pivot and the fourth pivot are parallel to each other; as well as, The motor driving portion is placed on the driving accommodation portion.

4. The electric front derailleur according to claim 3, characterized in that: The connecting mechanism also includes a third connecting member located above the first connecting member and the second connecting member, a first end of the third connecting member is rotatably connected to the operating shaft of the motor drive unit, and a second end of the third connecting member is pivotally connected to the chain guide.

5. The electric front derailleur according to claim 3, characterized in that: The base member includes a mounting structure extending vertically upward from the drive receiving portion; and When the electric front derailleur is mounted on the bicycle frame through the mounting structure, the axes of the first pivot, the second pivot, the third pivot and the fourth pivot, which are parallel to each other, form an obtuse angle with the seat tube axis of the bicycle frame.

6. The electric front derailleur according to claim 4, characterized in that: A through hole is formed at the first end of the third connecting member, and the operating shaft extends from above the through hole into the through hole for a certain distance; The drive accommodating portion is provided with a third connecting portion, the third connecting portion has a circular protrusion, the first end of the third connecting member is placed on the third connecting portion, and the circular protrusion extends from the bottom of the through hole into the through hole for a certain distance.

7. The electric front derailleur according to claim 4, characterized in that: The chain guide includes a fixed connection member disposed between a top end of the inner chain guide plate and a top end of the outer chain guide plate, and the third connection member is pivotally connected to the fixed connection member.

8. The electric front derailleur according to claim 1, characterized in that: The motor drive unit further comprises a housing, the housing comprising a lower housing and an upper housing, the electric motor is arranged in the housing, and the operating shaft extends out of the lower housing; The electric front derailleur further includes a power module disposed above the upper housing to supply power to the motor drive unit.

9. The electric front derailleur according to claim 8, characterized in that: The motor driving unit further comprises a control module and a gear transmission device disposed in the housing, the control module and the gear transmission device are used together to control the rotation of the electric motor; the gear transmission device comprises a multi-stage gear, a first-stage gear in the multi-stage gear is directly connected to the output end of the electric motor, and the output of the electric motor causes the first-stage gear in the multi-stage gear to rotate; and, The gear transmission device and the electric motor are arranged below the control module.

10. The electric front derailleur according to claim 9, characterized in that: When the chain guide is in the retracted position, a portion of the chain guide is closer to the bicycle frame than the motor driving part, or a side of the chain guide closer to the bicycle frame is flush with a side of the motor driving part closer to the bicycle frame.

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