Bicycle transmission device

Abstract

Bicycle transmission device (10), comprising: an input rotary shaft (14); an initial part (16); a transmission mechanism (20) which is designed to accelerate a rotary input from the input rotary shaft (14) and output the rotary input to the output part (16); a switching mechanism (22) which is designed to selectively switch between a first state in which the output part (16) and the input rotating shaft (14) are operatively coupled to transmit the rotational input via the transmission mechanism (20), and a second state, in which the output part (16) and the input rotating shaft (14) are operatively coupled without accelerating or switching the rotational input from the input rotating shaft (14) to the output part (16) via the transmission mechanism (20); and a transmission body (28) connecting the input rotating shaft (14) and a first rotating body (30), wherein the transmission body (28) is designed in a tubular shape and is provided to cover part of the output part (16); wherein the transmission mechanism (20) includes: the first rotating body (30) which is integrally rotatable with the input rotating shaft (14); a second rotating body (32) which is rotatable about a central axis (C) whose position does not change with respect to the input rotating shaft (14), and to which the torque of the first rotating body (30) is transmitted; a third rotating body (34) which is integrally rotatable with the second rotating body (32); and a fourth rotating body (36) to which the torque of the third body is transferred and which is integrally rotatable with the output part (16).

Description

[0001] This application claims priority over Japanese patent application 2015-063156, filed on March 25, 2015. The entire disclosure of Japanese patent application 2015-063156 is hereby fully incorporated by reference herein.

[0002] The present invention relates to a bicycle transmission device or bicycle derailleur device.

[0003] The bicycle transmission device described in Japanese Patent No. 5523636 comprises a transmission mechanism capable of reducing the speed of the rotational input to the crankshaft and outputting it to the output part, and a switching mechanism for switching between a state in which the crankshaft and the output part are coupled and a state in which the coupling between the crankshaft and the output part is disengaged. When the switching mechanism is in a state in which the crankshaft and the output part are disengaged, the rotation input to the crankshaft is slowed down by the transmission mechanism and output to the output part.When the shifting mechanism is in a state where the crankshaft and the output shaft are coupled, the rotation input to the crankshaft is transmitted to the output shaft without being slowed down or delayed by the transmission mechanism. This means that the transmission mechanism is capable of achieving two gear ratios with the shifting mechanism.

[0004] The transmission mechanism of the transmission device, as described above, slows down the rotation of the crankshaft and transmits this braking force to the output component. Therefore, the torque of the output component is greater than the torque of the crankshaft. Consequently, as the torque applied to the shifting mechanism increases, disengaging the coupling between the crankshaft and the output component becomes more difficult for the shifting mechanism. Therefore, the transmission power decreases.

[0005] Document EP 3 023 327 A1 discloses an electric auxiliary bicycle comprising a cylindrical link for translating the human driving force, a link for translating the combined force, and a reduction mechanism comprising pairs of reduction gears and a shift clutch that can be engaged with the reduction gears.

[0006] Document DE 10 2012 109 637 A1 discloses a bicycle drive unit comprising a motor with a hole in which a crank axle can be arranged, a transmission mechanism with a plurality of selectable gear ratios and an output part configured to add together an output of the transmission mechanism and an output of the motor.

[0007] Document FR 795 941 A discloses a bicycle gear system comprising a pedal shaft with a plurality of fixed gears with different pitch circles and an intermediate shaft with an equal number of loose gears, wherein a set of gears is constantly engaged via a movable wedge that sits in a hole in the intermediate shaft and a gear ratio can be set by moving the movable wedge.

[0008] Document DE 10 2010 051 727 A1 discloses a drive unit for a muscle-powered vehicle, comprising a first shaft on which a plurality of gears are mounted, and a second shaft on which a corresponding plurality of gears are mounted, which mesh with the gears of the first shaft, wherein one of the first and second shafts is connected or connectable to a motor shaft of an electric machine in order to couple a torque into or out of the transmission.

[0009] It is an object of the present invention to provide a bicycle transmission device or bicycle derailleur device that is capable of improving the transmission performance.

[0010] The bicycle transmission device or bicycle derailleur device according to the present invention comprises an input rotating shaft, an output part, a transmission mechanism or derailleur mechanism which can accelerate the rotation input from the input rotating shaft and output it to the output part, and a switching mechanism for switching between a first state in which the output part and the input rotating shaft are coupled via the transmission mechanism, and a second state in which the output part and the input rotating shaft are operatively coupled without accelerating the rotation input from the input rotating shaft to the output part via the transmission mechanism, wherein the transmission mechanism comprises a first rotating body which is integrally rotatable with the input rotating shaft;a second rotating body, rotatable about a central axis whose position does not change with respect to the input rotating shaft, and to which the torque of the first rotating body is transmitted; a third rotating body, rotatable integrally with the second rotating body; and a fourth rotating body, to which the torque of the third rotating body is / is transmitted and which is rotatable integrally with the output part.

[0011] Preferably, the switching mechanism, when in the first state, transmits the torque between the input rotating shaft and the first rotating body, between the first rotating body and the second rotating body, between the second rotating body and the third rotating body, between the third rotating body and the fourth rotating body, and between the fourth rotating body and the output part. It is also preferred that the switching mechanism, while in the second state, does not transmit the torque between the input rotating shaft and the first rotating body, the first rotating body and the second rotating body, the second rotating body and the third rotating body, the third rotating body and the fourth rotating body, and the fourth rotating body and the output part.

[0012] Preferably, the switching mechanism further comprises a one-way clutch that integrally rotates the input rotating shaft and the output part when the rotational speed of the input rotating shaft in one direction is equal to or greater than the rotational speed of the output part in one direction; when the rotational speed of the input rotating shaft in one direction is less than the rotational speed of the output part in one direction, and relative rotation between the input rotating shaft and the output part is / is allowed.

[0013] Preferably, the transmission mechanism includes a transmission shaft that supports the second rotating body and the third rotating body.

[0014] Preferably, the transmission shaft rotates integrally with at least one of the second rotating body and the third rotating body.

[0015] Preferably, the switching mechanism comprises a switching unit, wherein at least one part of it is arranged between the transmission shaft and the second rotating body, between the transmission shaft and the third rotating body, or between the fourth rotating body and the output part.

[0016] Preferably, the switching unit comprises a coupling element, wherein at least a part of it is arranged between the transmission shaft and the third rotating body, and which couples the transmission shaft and the third rotating body, and a control element that decouples the coupling element from the transmission shaft or the third rotating body.

[0017] Preferably, the coupling element comprises a latch which is provided / is provided on the outer periphery of the transmission shaft and which projects from or is separated from a groove which is formed / is formed on the inner periphery of the third rotating body.

[0018] Preferably, the control element is movable in the axial direction of the transmission shaft.

[0019] Preferably, the transmission mechanism is accelerated by the first rotating body and the second rotating body, and slowed down or decelerated by the third rotating body and the fourth rotating body.

[0020] Preferably, an auxiliary motor is attached to transmit torque to the second or third rotating body or the output part.

[0021] Preferably, the transmission mechanism comprises a transmission body that connects the input rotating shaft and the first rotating body, and a torque sensor which is / will be attached to the transmission body.

[0022] Preferably, the input rotating shaft is a crankshaft to which a muscle driving force is / is applied.

[0023] Preferably, the output part includes a mounting section to which a sprocket can be attached.

[0024] Preferably, the one-way coupling is a roller coupling.

[0025] Preferably, the bicycle transmission device further comprises a transmission body that connects the input rotating shaft and the first rotating body, wherein the transmission body is designed in a tubular shape and is provided to cover a part of the output part, wherein the one-way coupling is / is arranged between the inner periphery of the transmission body and the outer periphery of the output part.

[0026] Preferably, the transmission body and the first rotating body are integrally designed as a single, one-piece link.

[0027] The bicycle transmission device as described above can improve transmission performance. Fig. Figure 1 is a cross-sectional view of a bicycle transmission device when a transmission mechanism is in a first state with respect to the bicycle transmission device according to a first embodiment. Fig. Figure 2 is a cross-sectional view of the transmission device in Fig. 1, if the transmission mechanism is in a second state. Fig. Figure 3 is a cross-sectional view of a bicycle transmission device of a second embodiment. Fig. Figure 4 is a cross-sectional view of the bicycle transmission device of a third embodiment. Fig. Figure 5 is a schematic diagram of the transmission device of a first modified example of the first embodiment. Fig. Figure 6 is a schematic diagram of the transmission device of a second modified example of the first embodiment. Fig. Figure 7 is a schematic diagram of the transmission device of a third modified example of the first embodiment. Fig. Figure 8 is a cross-sectional view of the transmission device of a fourth modified example of the first embodiment. Fig. Figure 9 is a cross-sectional view of the transmission device of a fifth modified example of the first embodiment.

[0028] A bicycle transmission device of a first embodiment is described with reference to the Fig. 1 and Fig. 2 described.

[0029] As in Fig. As shown in Figure 1, the transmission device 10 comprises an input rotary shaft 14, which is a crankshaft, an output part 16 from which a rotation is output, a housing 18, a transmission mechanism 20 configured to output the rotation input from the input rotary shaft 14 to the output part 16, a switching mechanism 22 and an assistance mechanism 24.

[0030] The housing 18 is attached to a bicycle frame (not shown). The housing 18 accommodates part of the input rotary shaft 14, part of the output part 16, the transmission mechanism 20, and the shifting mechanism 22.

[0031] The input shaft 14 is rotatably supported by the housing 18. Both ends of the input shaft 14 are exposed outside the housing 18. A bicycle crank arm (not shown) can be attached to either end of the input shaft 14, and the muscle power is applied via the crank arm. The input shaft 14 can be a hollow shaft. The outer peripheral part of one end of the input shaft 14 is axially supported by the housing 18 via a bearing 19A. The outer peripheral part of the other end of the input shaft 14 is axially supported by the output part 16 of a bearing 19B.

[0032] The output part 16 is tubular in shape and arranged coaxially with the input rotating shaft 14. A bearing 19B, positioned axially spaced, is located on the inner peripheral surface of the output part 16. The output part 16 rotatably supports the input rotating shaft 14 via the bearing 19B. The outer peripheral surface in the vicinity of the exposed section of the output part 16 is supported by the housing via a bearing 19B. One end of the output part 16 is exposed outside the housing 18. The output part 16 includes a mounting section 16A, which is capable of being attached to an inner periphery of a sprocket S at one end in the axial direction of the input rotating shaft 14. Splines are formed on the outer peripheral surface of the mounting section 16A.The sprocket S is adapted to the splines of the outer peripheral surface of the mounting section 16A. A nut is formed in the inner peripheral surface of the mounting section 16A. The sprocket S is attached to the output part 16 by a bolt B, which is screwed into the mounting section 16A, clamping the sprocket S between them.

[0033] The transmission mechanism 20 comprises a transmission shaft 26, a transmission body 28, a first rotating body 30, a second rotating body 32, a third rotating body 34 and a fourth rotating body 36.

[0034] The transmission shaft 26 is arranged radially outside the input rotating shaft 14. The transmission shaft 26 is arranged parallel to the input rotating shaft 14. The transmission shaft 26 is rotatably supported by the housing 18. Both axial ends of the transmission shaft 26 are supported by the housing 18 via a pair of bearings 19D. The transmission shaft 26 is rotatable about a central axis C, the position of which does not change with respect to the input rotating shaft 14.

[0035] The transmission body 28 is tubular in shape. It is arranged around the input rotating shaft 14 and is coaxial with it. The transmission body 28 is supported by the input rotating shaft 14 in such a way that it cannot rotate relative to it via a spline fit, a press fit, or similar connection. Therefore, the transmission body 28 rotates integrally with the input rotating shaft 14.

[0036] The first rotating body 30 has a cylindrical shape, and one end of it in the axial direction is fitted to the transmission body 28. This means that the transmission body 28 couples the input rotating shaft 14 and the first rotating body 30. Gear teeth 30A, or toothing, are formed on the outer periphery of the first rotating body 30.

[0037] The second rotating body 32 is arranged coaxially with the transmission shaft 26. The transmission shaft 26 supports the second rotating body 32 such that it is not rotatable relative to the transmission shaft 26 via a spline fit, press fit, or similar connection. Therefore, the second rotating body 32 rotates integrally with the transmission shaft 26 about the central axis C. The gear teeth 32A are formed on the outer periphery of the second rotating body 32. The gear teeth 32A mesh with the gear teeth 30A of the first rotating body 30. Therefore, the torque of the transmission body 28 is transmitted to the second rotating body 32 via the first rotating body 30. The number of teeth of the gear teeth 32A of the second rotating body 32 is less than the number of teeth of the gear teeth 30A of the first rotating body 30.For this reason, the rotation which is transferred from the first rotating body 30 to the second rotating body 32 is accelerated.

[0038] The third rotating body 34 has a cylindrical shape. It is arranged around the transmission shaft 26 and is coaxial with it. The third rotating body 34 is supported by the transmission shaft 26 via the switching mechanism 22. The third rotating body 34 can be rotatably supported by the transmission shaft 26. When coupled to the transmission shaft 26 via the switching mechanism 22, the third rotating body 34 rotates integrally with the second rotating body 32 and the transmission shaft 26 about the central axis C. Several grooves 34B are formed on the inner periphery of the third rotating body 34 for coupling the switching mechanism 22. The multiple grooves 34B are arranged circumferentially at predetermined intervals. Each of the grooves 34B has the same shape as a so-called ratchet groove or pawl groove.The gear teeth 34A are formed on an outer periphery of the third rotating body 34.

[0039] The fourth rotating body 36 has a cylindrical shape. It is arranged around the output part 16 and is coaxial with it. The fourth rotating body 36 is coupled to the output part 16 via a spline fit, press fit, or similar connection. Therefore, the fourth rotating body 36 rotates integrally with the output part 16. Gear teeth 36A are formed on the outer periphery of the fourth rotating body 36. The gear teeth 36A mesh with the gear teeth 34A of the third rotating body 34. Therefore, torque is transmitted from the third rotating body 34 to the fourth rotating body 36. The number of teeth on the gear teeth 36A of the fourth rotating body 36 is less than the number of teeth on the gear teeth 34A of the third rotating body 34.For this reason, the rotation of the fourth rotating body 36, which is transmitted from the third rotating body 34, is slowed down by a predetermined speed reduction ratio to the fourth rotating body 36. The speed increase ratio between the first rotating body 30 and the second rotating body 32 is greater than the predetermined speed reduction ratio between the third rotating body 34 and the fourth rotating body 36. Therefore, when the rotation is transmitted from the first rotating body 30 to the fourth rotating body 36 via the second rotating body 32 and the rotating body 34, the rotational speed of the fourth rotating body 36 is greater than the rotational speed of the fourth rotating body 30.

[0040] The switching mechanism 22 switches between a first state, in which the output part 16 and the input rotating shaft 14 are coupled via the transmission mechanism 20, and a second state, in which the output part 16 and the input rotating shaft 14 are coupled without the transmission mechanism 20.

[0041] In the first state, the switching mechanism 22 allows torque to be transmitted between the input rotating shaft 14 and the first rotating body 30, between the first rotating body 30 and the second rotating body 32, between the second rotating body 32 and the third rotating body 34, between the third rotating body 34 and the fourth rotating body 36, and between the fourth rotating body 36 and the output part 16. In the second state, the switching mechanism 22 does not allow torque to be transmitted between the second rotating body 32 and the third rotating body 34.

[0042] The switching mechanism 22 comprises a switching unit 38, which is arranged between the transmission shaft 26 and the inner periphery of the fourth rotating body 34, a switching cam 40, which actuates the switching unit 38, an actuator 42, which actuates the switching cam 40, and a one-way clutch 44, which is arranged between the inner periphery of the transmission body 28 and the outer periphery of the output part 16. The actuator 42 is, for example, an electric motor.

[0043] The switching unit 38 comprises a coupling element 46, wherein at least a part of it is arranged between the outer periphery of the transmission shaft 26 and the inner periphery of the fourth rotating body 34, an elastic element 47 and a control element 48.

[0044] The coupling element 46 is provided at the outer periphery of the transmission shaft 26. The coupling element 46 can couple the transmission shaft 26 and the third rotating body 34. The coupling element 46 comprises a plurality of latches 46A that project from the transmission shaft 26 toward the inner periphery of the fourth rotating body 34. The inner periphery portions of the latches 46A are supported by and coupled to the transmission shaft 26.

[0045] The elastic element 47 is, for example, an annular spring. The elastic element 47 is fitted into the groove 46B, which is formed on the outer surfaces of a plurality of coupling elements 46. The elastic element 47 exerts a force on the pawls 46A in a direction that projects towards the inner periphery of the fourth rotating body 34.

[0046] The control element 48 has a cylindrical shape. The control element 48 is positioned around the transmission shaft 26 and is coaxial with the transmission shaft 26. The control element 48 can be moved in the axial direction of the transmission shaft 26. The control element 48 is not rotatable around the transmission shaft 26. The control element 48 is supported by a support section 18A, which is connected to the housing 18, such that the inner peripheral part can be moved in the axial direction of the transmission shaft 26. The control element 48 comprises a tapered surface 48A and a contact section 48B, which is in contact with a cam surface 40A of the switching cam 40. The tapered surface 48A is formed on one side of the transmission shaft 26 that is opposite the pawls 46A with respect to the axial direction.The contact section 48B of the control element 48 is formed on the opposite side of the tapered surface 48A with respect to the axial direction of the transmission shaft 26. A preload element, which is not illustrated, is attached to the control element 48. The preload element applies a force to the control element 48 in order to separate or disconnect it from the coupling element 46. The preload element is, for example, a spring.

[0047] The switching cam 40 is positioned opposite the contact section 48B. The switching cam 40 is provided with a cam surface 40A. The switching cam 40 is coupled to the actuator 42. When the electric motor, which is the actuator 42, rotates in one direction, the cam surface 40A of the switching cam 40 moves the control element 48 in a direction approaching the pawls 46A along the axial direction of the transmission shaft 26. When the electric motor, which is the actuator 42, rotates in the other direction, the movement of the control element 48 is permitted in a direction in which the switching cam 40 moves away from the control element 48 along the axial direction of the transmission shaft 26, and the preload element (not shown) moves the control element 48 away from the pawls 46A.

[0048] The one-way coupling 44 is a roller coupling. The one-way coupling 44 rotates integrally the input rotating shaft 14 and the output part 16 when the rotational speed of the input rotating shaft 14 in one direction is equal to or greater than the rotational speed of the output part 16 in that direction. The one-way coupling 44 allows relative rotation between the input rotating shaft 14 and the output part 16 when the rotational speed of the input rotating shaft 14 in one direction is less than the rotational speed of the output part 16 in that direction. The rotation in one direction corresponds to the direction of rotation of the input rotating shaft 14 when the bicycle (not shown) is moving forward.

[0049] When the control element 48 moves to one side away from the coupling element 46 in the axial direction of the transmission shaft 26 and is in a position away from the coupling element 46—in other words, when the transmission mechanism 20 is in the first state—the tapered surface 48A separates from the pawls 46A, and the pawls 46A spring forward toward the grooves 34B of the fourth rotating body 34. As a result, the pawls 46A are engaged in the grooves 34B. Consequently, the third rotating body 34 is no longer rotatable relative to the transmission shaft 26 and the fourth rotating body 32. As a result, the torque of the transmission shaft 26 and the fourth rotating body 32 is transmitted to the third rotating body 34.

[0050] The number of teeth on gear teeth 36A of the fourth rotating body 36 is less than the number of teeth on gear teeth 30A of the fourth rotating body 30. For this reason, when the switching mechanism 22 is in the first state, as shown in Fig. When the switching mechanism 22 is in the first state, the rotation input to the transmission mechanism 20 is accelerated and output to the output part 16. In the first state, the rotational speed of the input rotating shaft 14 and the fourth rotating body 30 is lower than the rotational speed of the output part 16. Therefore, the one-way coupling 44 allows relative rotation between the input rotating shaft 14 and the first rotating body 30, as well as the output part 16. As a result, the rotation of the input rotating shaft 14 is accelerated by the transmission mechanism 20 and output to the output part 16.

[0051] As in Fig. Figure 2 shows that when the control element 48 moves towards the side approaching the coupling element 46 in the axial direction of the transmission shaft 26 and is in a position that is in contact with the coupling element 46, that is, when the transmission mechanism 20 is in a second state, the tapered surface 48 pushes the pawls 46A downwards. As a result, the pawls 46A separate from the grooves 34B. This means that the control element 48 releases the coupling element 46 from the third rotating body 34. Consequently, the third rotating body 34 becomes rotatable relative to the transmission shaft 26 and the second rotating body 32. As a result, the torque from the transmission shaft 26 and the second rotating body 32 is no longer transmitted to the third rotating body 34.

[0052] When the switching mechanism 22 is in the second state, as in Fig. As shown in Figure 2, when the second rotating body 32 is in its second state, the torque is not transmitted from the second rotating body 32 to the third rotating body 34. Therefore, when the switching mechanism 22 is in its second state, the rotational speed of the input rotating shaft 14 and the fourth rotating body 30 is equal to or greater than the rotational speed of the output part 16. Consequently, the one-way clutch 44 integrally rotates the input rotating shaft 14 and the first rotating body 30, as well as the output part 16. As a result, the rotation of the input rotating shaft 14 is output to the output part 16 without acceleration by the transmission mechanism 20.

[0053] The assistance mechanism 24 includes an assistance motor 50. Gear teeth 52A are provided on the outer periphery of the output shaft 52 of the assistance motor 50. The gear teeth 52A mesh with the gear teeth 36A of the fourth rotating body 36 in a position different from the gear teeth 34A of the fourth rotating body 34. This means that the assistance motor 50 is / will be coupled to the output part 16 via the fourth rotating body 36.

[0054] A torque sensor 54 is attached to the transmission body 28. The torque sensor 54 outputs a signal corresponding to the torque applied to the transmission body 28 to the control device 56. The control device 56 controls the assist motor 50 based on the output of the torque sensor 54. The torque sensor 54 is implemented, for example, by a strain gauge. The signal from the strain gauge is transmitted wirelessly to the control device 56. The control device 56 controls the actuator 42. The control device 56 is connected to a switching unit (not shown) and drives the actuator 42 based on the signal from the switching unit. The switching unit consists of a switch and a lever located on the bicycle's handlebars.The switching unit can be connected to the control device 56 via electrical cables or wirelessly. The control device 56 can drive the actuator 42 based on, for example, a detection signal from a sensor provided on the bicycle. Examples of such a sensor include a speed sensor to detect the bicycle's speed and a cadence sensor to detect the crank's cadence. With the control device 56 driving the actuator 42, the transmission device 10 functions as a two-stage transmission device or derailleur device.

[0055] The operation of the transmission device 10 is described.

[0056] The coupling element 46 is positioned between the third rotating body 34 and the transmission shaft 26 after the rotation of the input rotating shaft 14 has been accelerated. This means that the amount of torque applied to the coupling element 46 is less than the amount of torque applied to the input rotating shaft 14. Therefore, when the transmission mechanism 20 is in the first state and the pawls 46A of the coupling element 46 are engaged in the grooves 34B of the fourth rotating body 34, the force required to disengage the pawls 46A from the grooves 34B can be reduced.

[0057] The transmission device 10 achieves the following effects: (1) The switching mechanism 22 switches the transmission of torque between the third rotating body 34 and the transmission shaft 26, which has a higher rotational speed and lower torque than the input rotating shaft 14. For this reason, the transmission performance is improved compared to when the transmission of torque between the elements is switched after the rotation of the input rotating shaft 14 has been slowed down or decelerated. (2) The switching mechanism 22 includes a one-way coupling 44. For this reason, for example, the configuration of the transmission device 10 can be simplified, compared to, for example, when an electric coupling is provided and the transmission of torque between the output part 16 and the input rotating shaft 14 or the first rotating body 30 is controlled. (3) The auxiliary motor 50 transmits the torque to the fourth rotating body 36. Therefore, the torque applied to the coupling element 46 can be reduced compared to when the torque of the auxiliary motor 50 is transmitted upstream of the fourth rotating body 36 along the power transmission path of the input rotating shaft 14 and the output part 16. Consequently, the power loss due to the torque from the auxiliary motor 50 can be suppressed.

[0058] A bicycle transmission device according to a second embodiment is referred to in the Fig. 3 described. Configurations that are identical to those in the first embodiment are designated with the same reference numerals and their descriptions are omitted.

[0059] The transmission device 10 comprises the input rotating shaft 14, the output part 16, the housing 18, a transmission mechanism 60 which can output the rotation that has been applied to the input rotating shaft 14 to the output part 16, and a switching mechanism 62.

[0060] The transmission mechanism 60 comprises the transmission shaft 26, a transmission body 28, the first rotating body 30, the second rotating body 32, the third rotating body 34, the fourth rotating body 36, a fifth rotating body 64, and a sixth rotating body 66. The transmission body 28 and the first rotating body 30 are provided as a single unit or integrated.

[0061] The fifth rotating body 64 is arranged around the transmission shaft 26 and is coaxial with the transmission shaft 26. The fifth rotating body 64 is supported by the transmission shaft 26 via a one-way coupling 68 of the switching mechanism 62. For this reason, the fifth rotating body 64 can be rotated integrally with the transmission shaft 26 about the central axis C when the transmission shaft 26 is rotated in a predetermined direction. Gear teeth 64A are formed on the outer periphery of the fifth rotating body 64.

[0062] The sixth rotating body 66 has a cylindrical shape. It is arranged around the output part 16 and is coaxial with it. The sixth rotating body 66 is coupled to the output part 16 via a spline fit, an interference fit, or a similar connection. Therefore, the sixth rotating body 66 rotates integrally with the output part 16. Gear teeth 66A are formed on the outer periphery of the sixth rotating body 66. The gear teeth 66A mesh with the gear teeth 64A of the fifth rotating body 64. Therefore, torque is transmitted from the fifth rotating body 64 to the sixth rotating body 66. The number of teeth on the gear teeth 66A of the sixth rotating body 66 is less than the number of teeth on the gear teeth 64A of the fifth rotating body 64. For this reason, the rotation of the fifth rotating body 64 is slowed down and transferred to the sixth rotating body 66.The speed reduction ratio between the fifth rotating body 64 and the sixth rotating body 66 differs from the predetermined speed reduction ratio between the third rotating body 34 and the fourth rotating body 36. The speed reduction ratio between the fifth rotating body 64 and the sixth rotating body 66 is lower than the predetermined speed reduction ratio between the third rotating body 34 and the fourth rotating body 36. The speed increase ratio between the first rotating body 30 and the second rotating body 32 is lower than the predetermined speed reduction ratio between the fifth rotating body 64 and the sixth rotating body 66.For this reason, when the rotation is transferred from the first rotating body 30 to the sixth rotating body 66 via the fourth rotating body 32 and the fifth rotating body 64, the rotational speed of the sixth rotating body 66 is slower or lower than that of the fourth rotating body 30.

[0063] The switching mechanism 62 switches between a first state and a second state via the transmission mechanism 60.

[0064] In the first state, the switching mechanism 62 allows torque to be transmitted between the input rotating shaft 14 and the first rotating body 30, between the first rotating body 30 and the second rotating body 32, between the second rotating body 32 and the third rotating body 34, between the third rotating body 34 and the fourth rotating body 36, and between the fourth rotating body 36 and the output part 16. However, it does not allow torque to be transmitted between the second rotating body 32 and the fifth rotating body 64.In the second state, the switching mechanism 62 allows torque to be transmitted between the input rotating shaft 14 and the first rotating body 30, between the first rotating body 30 and the second rotating body 32, between the second rotating body 32 and the fifth rotating body 64, between the fifth rotating body 64 and the sixth rotating body 66, and between the sixth rotating body 66 and the output part 16. However, torque transmission between the second rotating body 32 and the third rotating body 34 is not permitted.

[0065] The switching mechanism 62 comprises a switching unit 38, an actuator 42 and a one-way coupling 68, which is arranged between the inner periphery of the transmission body 28 and the outer periphery of the output part 16.

[0066] The one-way coupling 68 is a roller coupling. The one-way coupling 68 rotates integrally with the transmission shaft 26 and the fifth rotating body 64 when the rotational speed of the transmission shaft 26 and the second rotating body 32 in one direction is equal to or greater than the rotational speed of the fifth rotating body 64 in that direction. The one-way coupling 68 allows relative rotation of the transmission shaft 26 and the fifth rotating body 64 when the rotational speed of the transmission shaft 26 and the fourth rotating body 32 in one direction is less than the rotational speed of the fifth rotating body 64 in that direction. The rotation in one direction corresponds to the direction of rotation of the transmission shaft 26 and the fourth rotating body 32 when the bicycle (not shown) is moving forward.

[0067] When the transmission mechanism 60 is in the first state, the pawls 46A are engaged in the grooves 34B, and the torque of the transmission shaft 26 and the fourth rotating body 32 is transmitted to the third rotating body 34. The rotation transmitted to the third rotating body 34 is output to the output part 16 via the fourth rotating body 36. When the switching mechanism 62 is in the first state, the rotational speed of the transmission shaft 26 and the fourth rotating body 32 is lower than the rotational speed of the fifth rotating body 64, which is input to the fifth rotating body 64 from the output part 16 via the sixth rotating body 66. For this reason, the one-way clutch 68 allows relative rotation between the transmission shaft 26 and the fifth rotating body 64. As a result, the rotation of the input rotating shaft 14 is adjusted according to the transmission ratio.The transmission ratio between the first rotating body 30 and the second rotating body 32, as well as the transmission ratio or translation ratio between the third rotating body 34 and the fourth rotating body 36, is switched and output to the output part 16.

[0068] When the transmission mechanism 60 is in the second state, the pawls 46A are separated from the grooves 34B, such that the torque of the transmission shaft 26 and the fourth rotating body 32 is not transmitted to the third rotating body 34. Therefore, when the switching mechanism 62 is in the second state, the rotational speed of the transmission shaft 26 and the fourth rotating body 32 is equal to or greater than the rotational speed of the fifth rotating body 64. As a result, the one-way clutch 68 integrally rotates the transmission shaft 26 and the fifth rotating body 64. Consequently, the rotation of the input rotating shaft 14 is determined according to the transmission ratio between the first rotating body 30 and the second rotating body 32, as well as the transmission ratio of the first rotating body 30 to the second rotating body 32.The transmission ratio between the fifth rotating body 64 and the sixth rotating body 66 is switched and output to the output part 16. According to the transmission device 10 of the present embodiment, the effects can be achieved as in the first embodiment.

[0069] A bicycle transmission device according to a third embodiment is described with reference to Fig. 4 described. Configurations that are identical to those in the first embodiment are designated with the same reference numerals and their description is omitted.

[0070] The transmission device 10 comprises the input rotary shaft 14, the output part 16, the housing 18, a transmission mechanism 70 which can output the rotation input from the input rotary shaft 14 to the output part 16, and a switching mechanism 72.

[0071] The transmission mechanism 70 comprises the transmission shaft 26, the transmission body 28, a first rotating body 74, a second rotating body 76, a third rotating body 78 and a fourth rotating body 80.

[0072] The first rotating body 74 has a cylindrical shape, and one end of it in the axial direction is adapted to the transmission body 28. This means that the transmission body 28 couples the input rotating shaft 14 and the first rotating body 74. Gear teeth 74A are formed on the outer periphery of the first rotating body 74.

[0073] The second rotating body 76 is arranged around the transmission shaft 26 and is coaxial with it. The second rotating body 76 is supported by the transmission shaft 26 via a one-way coupling 86 of the switching mechanism 72. Therefore, the second rotating body 76 rotates integrally with the transmission shaft 26 about the central axis C. Gear teeth 76A are formed on the outer periphery of the second rotating body 76. The gear teeth 76A mesh with the gear teeth 74A of the first rotating body 74. Therefore, the torque of the first rotating body 74 is transmitted to the second rotating body 76 via the transmission body 28. The number of teeth on the gear teeth 76A of the second rotating body 76 is less than the number of teeth on the gear teeth 74A of the first rotating body 74. For this reason, the rotation of the first rotating body 74 is accelerated and transmitted to the second rotating body 76.

[0074] The third rotating body 78 is arranged around the transmission shaft 26 and is coaxial with it. The transmission shaft 26 supports the third rotating body 78 in such a way that it cannot rotate relative to it via a spline fit, an interference fit, or similar mechanism. Therefore, the third rotating body 78 rotates integrally with the transmission shaft 26 about the central axis C. Gear teeth 78A are formed on the outer periphery of the third rotating body 78.

[0075] The fourth rotating body 80 has a cylindrical shape. It is arranged around the output part 16 and is coaxial with it. The fourth rotating body 80 is coupled to the output part 16 via a spline fit, an interference fit, or a similar connection. Therefore, the fourth rotating body 80 rotates integrally with the output part 16. Gear teeth 80A are formed on the outer periphery of the fourth rotating body 80. The gear teeth 80A mesh with the gear teeth 78A of the third rotating body 78. Therefore, torque is transmitted from the third rotating body 78 to the fourth rotating body 80. The number of teeth on gear teeth 80A of the fourth rotating body 80 is less than the number of teeth on gear teeth 78A of the third rotating body 78. For this reason, the rotation of the fourth rotating body 80 is slowed down or decelerated.The rotation is slowed down and transferred to the fourth rotating body 80. The speed increase ratio between the third rotating body 78 and the second rotating body 76 is lower than the predetermined speed reduction ratio between the third rotating body 78 and the fourth rotating body 80. Therefore, when the rotation is transferred from the first rotating body 74 to the fourth rotating body 80 via the second rotating body 76 and the third rotating body 78, the rotational speed of the fourth rotating body 80 is lower, or slower, than that of the first rotating body 74.

[0076] The switching mechanism 72 switches between a first state in which the output part 16 and the input rotating shaft 14 are coupled via the transmission mechanism 70, and a second state in which the output part 16 and the input rotating shaft 14 are coupled without the transmission mechanism 70.

[0077] The switching mechanism 72 allows the torque to be transmitted in the first state between the input rotating shaft 14 and the first rotating body 74, between the first rotating body 74 and the second rotating body 76, between the second rotating body 76 and the third rotating body 78, between the third rotating body 78 and the fourth rotating body 80, and between the fourth rotating body 80 and the output part 16. The switching mechanism 72 does not allow the torque to be transmitted in the second state between the second rotating body 76 and the third rotating body 78.

[0078] The switching mechanism 72 comprises a switching unit 82, which is arranged between the transmission shaft 26 and the inner periphery of the third rotating body 78, the actuator 42, which actuates the switching unit 82, and a one-way coupling 86, which is arranged between the inner periphery of the second rotating body 76 and the outer periphery of the transmission shaft 26.

[0079] The switching unit 82 comprises a coupling element 84, wherein at least one part of it is arranged between the outer periphery of the output part 16 and the inner periphery of the first rotating body 74, the control element 48 and the switching cam 40.

[0080] The coupling element 84 is provided at the outer periphery of the output part 16. The coupling element 84 can couple the output part 16 and the first rotating body 74. The coupling element 84 comprises a plurality of latches 84A that can project from the output part 16 to the inner periphery of the first rotating body 74.

[0081] The one-way coupling 86 is a roller coupling. The one-way coupling 86 integrally rotates the second rotating body 76 and the transmission shaft 26 when the rotational speed of the input rotating shaft 14 in one direction is equal to or less than the rotational speed of the output part 16 in that direction. The one-way coupling 86 allows relative rotation between the input rotating shaft 14 and the output part 16 when the rotational speed of the input rotating shaft 14 in one direction is greater than the rotational speed of the output part 16 in that direction. The rotation in one direction corresponds to the direction of rotation of the input rotating shaft 14 when the bicycle (not shown) is moving forward.

[0082] When the control element 48 moves towards the coupling element 84 in the axial direction of the output part 16 and into a position that is in contact with the coupling element 84, that is, when the transmission mechanism 20 is in the first state, the tapered surface 48A pushes the pawls 84A downwards. The pawls 84A are thereby separated from the grooves 74B formed on the inner periphery of the first rotating body 74. This means that the control element 48 disengages the coupling element 84 from the first rotating body 74. As a result, the first rotating body 74 becomes rotatable relative to the output part 16. Consequently, the torque of the first rotating body 74 is transmitted to the output part 16.

[0083] At this point, the torque from the first rotating body 74 is transmitted to the second rotating body 76, causing it to rotate. Also at this point, the rotational speed of the third rotating body 78 is equal to or less than the rotational speed of the second rotating body 76. As a result, the second rotating body 76 integrally rotates the third rotating body 78 via the one-way coupling 86 and the transmission shaft 26. The torque of the third rotating body 78 is transmitted to the output part 16 via the fourth rotating body 80. Consequently, the rotation of the input rotating shaft 14 is slowed down by the transmission mechanism 70 and output to the output part 16.

[0084] When the control element 48 moves laterally away from the coupling element 84 in the axial direction of the output part 16 and is in a position away from the coupling element 84—in other words, when the transmission mechanism 70 is in a second state—the tapered surface 48A separates from the pawls 84A, and the pawls 84A spring forward toward the grooves 74B formed on the inner periphery of the first rotating body 74. As a result, the pawls 48A are engaged in the grooves 74B. Consequently, the first rotating body 74 becomes non-rotatable relative to the output part 16. The torque of the first rotating body 74 is then transmitted to the output part 16.

[0085] At this point, the torque of the output part 16 is transmitted to the third rotating body 78 via the fourth rotating body 80. The number of teeth on the gear teeth 78A of the third rotating body 78 is greater than the number of teeth on the gear teeth 80A of the fourth rotating body 80. Therefore, the rotational speeds of the input rotating shaft 14, the output part 16, and the first rotating body 74 are lower than the rotational speeds of the third rotating body 78 and the transmission shaft 26. As a result, the second rotating body 76 can rotate relative to the transmission shaft 26 via the one-way coupling 86. Consequently, the rotation of the second rotating body 76 is not transmitted to the transmission shaft 26. Therefore, the rotation of the input rotating shaft 14 is output to the output part 16 without being slowed down or decelerated by the transmission mechanism 70.

[0086] The specific shape that the bicycle transmission device can assume is not limited to the shapes described as examples in the preceding embodiments. The bicycle transmission device can assume different shapes from those described above. A modified example of the embodiments described above is explained below as an example of the different shapes that the bicycle transmission device can assume. • The coupling element 46 of the first embodiment can be connected between the transmission body 28 and the first rotating body 30, as shown in Fig. The coupling element 44 can be arranged as shown in Figure 5. In this case, the one-way coupling 44 is arranged between the input rotating shaft 14 and the output part 16. Furthermore, the third rotating body 34 is non-rotatably supported by the transmission shaft 26 via a spline fit, press fit, or similar connection. The coupling element 46 can also be arranged between the input rotating shaft 14 and the transmission body 28. In this case, the transmission performance of the transmission device 10 can also be improved compared to when the coupling element 46 is arranged after the rotation applied to the input rotating shaft 14 has been slowed down or decelerated to be slower than the rotation of the input rotating shaft 14. • The coupling element 46 of the first embodiment can be placed between the second rotating body 32 and the transmission shaft 26, as shown in Fig. The third rotating body 34 is arranged as shown in Figure 6. In this case, the third rotating body 34 is not rotatably supported by the transmission shaft 26 via a spline fit, press fit or similar. • The coupling element 46 of the first embodiment can be connected between the fourth rotating body 36 and the output part 16, as shown in Fig. 7 is shown, arranged. In this case, the third rotating body 34 is not rotatably supported by the transmission shaft 26 via a spline fit, press fit or similar. • The coupling element 46 of the first embodiment can be arranged on the inner periphery of the third rotating body 34. In this case, the outer periphery of the transmission shaft 26 has grooves into which the pawls 46A of the coupling element 46 are fitted. • The transmission body 28 and the first rotating body 30 of the first embodiment can be integrally formed as a one-piece link, as in Fig. 8 shown, be trained. • In the transmission mechanisms 20, 60 of the first and second embodiments, the speed between the third rotating body 34 and the fourth rotating body 36 can be increased. In this case, in the second embodiment, the speed between the fifth rotating body 64 and the sixth rotating body 66 can be increased at a speed increase ratio that differs from that of the third rotating body 34 and that of the fourth rotating body 36, and at a speed increase ratio that is lower than that of the third rotating body 34 and the fourth rotating body 36. • The assistance motor 50 of the first and second embodiments can be coupled to the second rotating body 32, 76. In particular, as shown in Fig.As shown in Figure 9, the gear teeth 52A of the output shaft 52 of the assist motor 50 mesh with the gear teeth 32A of the second rotating body 32. The torque of the assist motor 50 is added to the torque of the transmission shaft 26. Therefore, when the tapered surface 48A of the control element 48 and the pawls 46A are in contact, the force to which the torque of the assist motor 50 is added is converted into a force that pushes the pawls 46A down along the tapered surface 48A through the transmission shaft 26, thus allowing easier shifting. • The one-way couplings 44, 68, 86 of the first to third embodiments can be a one-way coupling which is / will be provided with a ratchet mechanism or pawl mechanism. • A one-way coupling, which prevents reverse rotation of the output part 16, can be provided on the transmission device 10 of the first to third embodiments. The one-way coupling is provided, for example, between the input rotating shaft 14 and the transmission body 28. • A braking mechanism or deceleration mechanism can be provided between the assistance motor 50 and the third rotating body 34, 78 of the first to third embodiments. • The assistance mechanism 24 of the first to third embodiments can also be omitted. • The transmission device 10 of the first to third embodiments can be provided radially outside the crankshaft. In this case, a transmission mechanism is provided for inputting the rotation of the crankshaft to the input rotating shaft. • The actuator 42 of the first to third embodiments can be omitted. In this case, the actuating device attached to the bicycle and the switching mechanisms 22, 62, 72 are connected by a cable, and the switching cam 40 is actuated by actuating the cable. • In the transmission device 10 of each of the embodiments described above, the first and second rotating bodies are coupled by gears, the third and fourth rotating bodies are coupled by gears, and the fifth and sixth rotating bodies are coupled by gears. However, the following modifications can be made. That is, the transmission device 10 can be configured such that the first to sixth rotating bodies are designed as a sprocket or a disc, so that a connection exists between the first rotating body and the second rotating body, between the third rotating body and the fourth rotating body, and between the fifth rotating body and the sixth rotating body via an annular body, such as a chain or a belt or band.

[0087] The technical concept encompassed by the embodiments and modified examples described above is appended below. (Annex 1)

[0088] A bicycle transmission device comprising: an input rotating shaft; an initial part; a transmission mechanism that can convert a rotary input from the input rotary shaft and output it to the output part; and a switching mechanism, wherein the transmission mechanism comprises: a first rotating body which is integrally rotatable with the input rotating shaft; a second rotating body which is rotatable about a central axis whose position does not change with respect to the input rotating shaft, and on which the rotation of the first rotating body is accelerated and transmitted; a third rotating body that is integrally rotatable with the second rotating body; and a fourth rotating body, to which the torque of the third rotating body is slowed down and transmitted in a predetermined transmission ratio, and which is integrally rotatable with the output part; a fifth rotating body, which is integrally rotatable with the second rotating body; and a sixth rotating body, in which the torque of the fifth rotating body is slowed down and transmitted in a transmission ratio that differs from the predetermined transmission ratio, and which is integrally rotatable with the output part; and the switching mechanism, between a first state in which the torque is transmitted between the input rotating shaft and the first rotating body, between the first rotating body and the second rotating body, between the second rotating body and the third rotating body, between the third rotating body and the fourth rotating body, and between the fourth rotating body and the output part, while the torque is not transmitted between the second rotating body and the fifth rotating body, and a second state in which the torque is transmitted between the input rotating shaft and the first rotating body, between the first rotating body and the second rotating body, between the second rotating body and the fifth rotating body, between the fifth rotating body and the sixth rotating body, and between the sixth rotating body and the output part,while the torque is not transmitted between the second rotating body and the third rotating body, it can switch. (Annex 2)

[0089] The bicycle transmission device includes: an input rotating shaft; an initial part; a transmission mechanism that can slow down an input rotation from the input rotating shaft and output it to the output part; and a switching mechanism that switches between a first state in which the output part and the input rotating shaft are coupled via the transmission mechanism and a second state in which the output part and the input rotating shaft are coupled without the transmission mechanism, wherein the transmission mechanism comprises: a first rotating body that is integrally rotatable with the input rotating shaft; a second rotating body which is rotatable about a central axis whose position does not change with respect to the input rotating shaft and to which the rotation of the first rotating body is accelerated and transmitted by a predetermined factor; a third rotating body that is integrally rotatable with the second rotating body; and a fourth rotating body, to which the torque of the third rotating body is slowed down further than the predetermined factor and transmitted, and which is integrally rotatable with the original part; and The switching mechanism transmits the torque between the input rotating shaft and the first rotating body, between the first rotating body and the second rotating body, between the second rotating body and the third rotating body, between the third rotating body and the fourth rotating body, and between the fourth rotating body and the output part in a first state; wherein in a second state the torque is not transmitted between the second rotating body and the third rotating body or between the third rotating body and the fourth rotating body. DESCRIPTION OF REFERENCE MARKS 10 Transmission device 14 Input rotating shaft (crankshaft) 16 Starting part 16A Mounting section 20 Transmission mechanism 26 transmission wave 28 transmission bodies 30 first rotating body 32 second rotating body 34 third rotating body 24B Nut 36 fourth rotating body 22 Switching mechanism 38 switching unit 46 Coupling element 46A jack 48 Control element 44 One-way coupling (roller coupling) 50 Assist motor 54 Torque sensor

Claims

Bicycle transmission device (10), comprising: an input rotating shaft (14); an output part (16); a transmission mechanism (20) configured to accelerate a rotational input from the input rotating shaft (14) and output the rotational input to the output part (16); a switching mechanism (22) configured to selectively switch between a first state in which the output part (16) and the input rotating shaft (14) are operatively coupled to transmit the rotational input via the transmission mechanism (20), and a second state in which the output part (16) and the input rotating shaft (14) are operatively coupled without accelerating the rotational input from the input rotating shaft (14) to the output part (16) via the transmission mechanism (20);and a transmission body (28) connecting the input rotating shaft (14) and a first rotating body (30), wherein the transmission body (28) is in a tubular shape and is provided to cover part of the output part (16); wherein the transmission mechanism (20) comprises: the first rotating body (30), which is integrally rotatable with the input rotating shaft (14); a second rotating body (32), which is rotatable about a central axis (C), the position of which does not change with respect to the input rotating shaft (14), and to which the torque of the first rotating body (30) is transmitted; a third rotating body (34), which is integrally rotatable with the second rotating body (32); and a fourth rotating body (36), to which the torque of the third body is transmitted, and which is integrally rotatable with the output part (16). Bicycle transmission device (10) according to claim 1, in which the switching mechanism (22) in the first state transmits the torque between the input rotating shaft (14) and the first rotating body (30), between the first rotating body (30) and the second rotating body (32), between the second rotating body (32) and the third rotating body (34), between the third rotating body (34) and the fourth rotating body (36), and between the fourth rotating body (36) and the output part (16); and the switching mechanism (22) in the second state does not transmit the torque between the input rotating shaft (14) and the first rotating body (30), the first rotating body (30) and the second rotating body (32), the second rotating body (32) and the third rotating body (34), the third rotating body (34) and the fourth rotating body (36), and the fourth rotating body (36) and the output part (16). Bicycle transmission device (10) according to claim 1 or 2, wherein the switching mechanism (22) further comprises a one-way clutch (44) which integrally rotates the input rotating shaft (14) and the output part (16) when the rotational speed of the input rotating shaft (14) in one direction is equal to or greater than the rotational speed of the output part (16) in one direction; when the rotational speed of the input rotating shaft (14) in one direction is less than the rotational speed of the output part (16) in one direction, and relative rotation between the input rotating shaft (14) and the output part (16) is / becomes permitted. Bicycle transmission device (10) according to claim 3, wherein the one-way coupling (44) is a roller coupling. Bicycle transmission device (10) according to one of claims 1 to 4, wherein the transmission mechanism (20) further comprises a transmission body (28) which connects the input rotating shaft (14) and the first rotating body (30) and a torque sensor is / will be attached to the transmission body (28). Bicycle transmission device (10) according to claim 3 or 4, in which the one-way coupling (44) is / is arranged between the inner periphery of the transmission body (28) and the outer periphery of the output part (16). Bicycle transmission device (10) according to claim 5 or 6, in which the transmission body (28) and the first rotating body (30) are integrally formed as a single-piece element. Bicycle transmission device (10) according to one of claims 1 to 7, wherein the transmission mechanism (20) comprises a transmission shaft (26) which supports the second rotating body (32) and the third rotating body (34), in particular the transmission shaft (26) rotates integrally with at least one of the second rotating body (32) and the third rotating body (34). Bicycle transmission device (10) according to claim 8, wherein the switching mechanism (22) comprises a switching unit (38), wherein at least a part of it is / is arranged between the transmission shaft (26) and the second rotating body (32), between the transmission shaft (26) and the third rotating body (34) or between the fourth rotating body (36) and the output part (16). Bicycle transmission device (10) according to claim 9, in which the switching unit (38) comprises a coupling element (46), wherein at least a part of it is / is arranged between the transmission shaft (26) and the third rotating body (34), and which can couple the transmission shaft (26) and the third rotating body (34), and a control element (48) which decouples the coupling element (46) from the transmission shaft (26) or the third rotating body (34). Bicycle transmission device (10) according to claim 10, wherein the coupling element (46) comprises a pawl (46A) which is provided / is provided on the outer periphery of the transmission shaft (26) and which projects from or is separated from a groove (24B) which is formed on an inner periphery of the third rotating body (34). Bicycle transmission device (10) according to claim 10 or 11, in which the control element (48) can be moved in an axial direction of the transmission shaft (26). Bicycle transmission device (10) according to one of claims 1 to 12, in which the transmission mechanism (20) is accelerated by the first rotating body (30) and the second rotating body (32), and is slowed down or decelerated by the third rotating body (34) and the fourth rotating body (36). Bicycle transmission device (10) according to one of claims 1 to 13, in which an assistance motor (50) which transmits the torque to the second rotating body (32) or the output part (16) is / will be attached. Bicycle transmission device (10) according to one of claims 1 to 14, wherein the input rotating shaft (14) is a crankshaft to which a muscle driving force is / is applied. Bicycle transmission device (10) according to one of claims 1 to 15, wherein the output part (16) comprises a mounting section (16A) to which a chain wheel (S) can be attached.

Images