TW201542418A - Eight-speed internal transmission hub of bicycle - Google Patents

Abstract

The invention provides an eight-speed internal transmission hub of a bicycle, in which a wheel hub unit comprises three stationary clutches, one transmission unit, three gear shifting units, and three one-way clutches arranged therein. The transmission unit receives input of power, and each stationary clutch on the main axle is made ejecting to mesh with a sun gear of the corresponding gear shifting units. Thus, through combination of different ejecting states of the stationary clutches on the main axle, eight different gear shift positions can be obtained. Cooperation of a planetary gear mechanism of each gear shifting unit with each stationary clutch increases the transmission efficiency and effectively reduce the use of axial space. Therefore, this invention can provide an eight-speed internal transmission hub of a bicycle with a small axial space and a simple structure.

Description

Bicycle eight-speed internal transmission

The invention relates to a bicycle shifting device, in particular to a bicycle eight-speed internal transmission.

The bicycle transmission can be mainly divided into an external transmission and an internal transmission according to the difference between the constituent mechanism and the installation mode, both of which are disposed at the rear wheel hub of the bicycle, the outer transmission is disposed outside the hub, and the internal transmission is disposed at In the hub, the general internal transmission usually uses the planetary gear train as the main body of the shifting mechanism. The power part is input by the sprocket. After switching the different components and changing the speed and torque, the power is output from the hub to the rear wheel. In order to achieve the purpose of multi-speed shifting.

The existing internal transmission uses the translating control unit to adjust the speed, and uses the change of the axial position to drive the planetary gears at different positions to complete the adjustment of the multi-stage gear position and achieve the purpose of switching different shift gear positions.

However, the existing bicycle internal transmission also requires a large axial space for the stroke to be carried out, so that the hub needs a large volume to provide a large internal space for the internal transmission installation, and the lightweight requirements required by the current bicycle industry. Inconsistent, the lack of improvement is necessary.

In order to solve the problem that the existing bicycle internal transmission requires a large axial space, the present invention provides a bicycle eight-speed internal transmission that can effectively reduce axial space utilization.

The invention provides a bicycle eight-speed internal transmission, comprising: a hub unit comprising a hub body, two side covers and a main shaft, wherein the hub body is hollow and includes a hub inner tooth formed on the inner side, two The side covers are respectively disposed at two ends of the hub and are first and second side covers respectively, the main shaft passes through the two side covers and the hub; three fixed clutches, which are first, second and third fixed clutches respectively And disposed at different longitudinal positions of the main shaft, each of the fixed clutches includes a spring end and a pawl, and the pawls of each fixed clutch are respectively located at different positions in the longitudinal direction of the main shaft, and the spring end of each fixed clutch is also located at the main shaft a different position of the longitudinal direction, a spring is disposed between each spring end and the main shaft; a transmission unit is disposed on the hub unit, and includes a sprocket, a speed control sleeve, three speed control rings and a control sleeve a cylinder, wherein the sprocket is disposed on one side of the first side cover, the speed control sleeve is sleeved on the main shaft, passes through the first side cover, and each speed regulating ring is not the first The second and third speed control rings are sleeved on the main shaft and located in the speed control sleeve, and the speed control rings and the speed control sleeve are circumferentially clamped, and the inside of each speed control ring a plurality of ratchet teeth are disposed on the side, and the ratchet teeth of each of the speed regulating rings are respectively located at different positions in the circumferential direction with respect to each other, and the control sleeve is sleeved on the adjusting sleeve, the outer wall of the control sleeve and the first side The cover is circumferentially locked; a first shifting unit is disposed in the hub unit, and includes a first sun gear and a plurality of first planetary gears, wherein the first sun gear is sleeved on the main shaft, and The inner side of the first sun gear is selectively engaged with the spring end of the first fixed clutch, and each of the first planetary gears is disposed around the first sun gear in a snap-fit manner; a second shifting unit is disposed In the hub unit, including a second sun gear and a plurality of second planetary gears, wherein the second sun gear is sleeved on the main shaft, and the inner side of the second sun gear and the spring of the second fixed clutch Selective phase card a second planetary gear is disposed around the second sun gear; a third shifting unit is disposed in the hub unit, and includes a third sun gear and a plurality of third planetary gears, wherein The third sun gear is sleeved on the main shaft, and the inner side of the third sun gear is selectively engaged with the spring end of the third fixed clutch, and each of the third planetary gears is disposed around the third sun. a ring gear set, disposed in the hub unit, and including a three-ring gear and a plurality of fourth planetary gears, wherein each of the ring gears is a first, a second, and a third ring gear, respectively The ring gear is sleeved on the first side cover and includes an inner tooth portion and an outer tooth portion. The inner tooth portion is engaged with each of the first planetary gears, and each of the fourth planetary gears is disposed around the first ring gear. The second ring gear is sleeved on the second shifting unit, and includes an inner tooth portion and an inner ratchet portion. The inner tooth portion of the second ring gear meshes with each of the second planetary gears. The third ring tooth The first ring gear, the second ring gear and the third shifting unit are sleeved, and include an inner tooth portion and an inner ratchet portion, the inner tooth portion of the third ring gear and each of the third planetary gears a side plate group, disposed in the hub unit, comprising five side plates and at least five fixing bolts, each of the side plates being first, second, third, fourth and fifth side plates, the first side plate being located Between the control sleeve and the first shifting unit, and circumferentially locking with the control sleeve, the second side plate is located between the first shifting unit and the second shifting unit, the third a side plate is located between the second shifting unit and the second ring gear, the fourth side plate is located between the third shifting unit and the third ring gear, and the fifth side plate is sleeved on the first ring gear, located at the Between the third ring gear and each of the fourth planetary gears, each of the at least five fixing bolts is a first, a second, a third, a fourth and a fifth fixing bolt, and the first fixing bolt is inserted into the first side plate, wherein a first planetary gear, the second side plate, and a second row thereof a gear and the third side plate, the second fixing bolt is inserted into the first, second and third side plates, and the third fixing bolt is inserted into the second ring gear, one of the third planetary gears and the fourth side plate, The fourth fixing bolt is inserted into the fifth side plate and the third ring gear, the fifth fixing bolt is inserted into the fifth side plate and one of the fourth planetary gears, and the three one-way clutch is disposed in the hub unit. The first, second, and third one-way clutches are respectively disposed, wherein the first one-way clutch is disposed around the third side plate and selectively engages the inner ratchet portion of the second ring gear, the second single Providing a clutch around the fourth side plate and selectively engaging an inner ratchet portion of the third ring gear, the third one-way clutch being disposed on an outer wall of the first side cover, and selectively engaging the first side The inner wall of the ring gear.

The bicycle eight-speed internal transmission, wherein the main shaft is recessed with three fixed clutch grooves respectively corresponding to the fixed clutches, and the fixed clutch grooves are respectively recessed at different longitudinal positions of the outer wall of the main shaft and each fixed clutch is accommodated. The pop-up springs are respectively disposed in the respective fixed clutch grooves.

According to the above technical means, the achievable improvement of the present invention is: controlling the operation of each fixed clutch by the speed control sleeve, integrating the fixed clutches with the split planetary gear system, and designing different gear positions. The operation sequence of the different clutches enables the present invention to have an eight-speed shift position, and the fixed clutch is radially ejected or received relative to the main shaft instead of axially moving, thereby effectively reducing the use of axial space, thereby achieving Reduce overall space, reduce transmission size and reduce production costs.

In order to understand the technical features and practical functions of the present invention in detail, and in accordance with the contents of the specification, the following is further illustrated in the following preferred embodiments.

Referring to FIG. 1 to FIG. 3, a preferred embodiment of the bicycle eight-speed internal transmission provided by the present invention is as shown in the drawings, including a hub unit 10, three fixed clutches 20, a transmission unit 30, and a first shifting speed. The unit 40, a second shifting unit 50, a third shifting unit 60, a ring gear set 70, a side plate set 80, and a three-way clutch 90.

Referring to FIG. 4 and FIG. 5 , the hub unit 10 is disposed at a center position of a bicycle rear wheel W and is used to drive the bicycle rear wheel W to rotate. The hub unit 10 includes a hub body 11 and two. The side cover 12 and a main shaft 13 are formed in a circular tubular shape, and include a hub internal tooth 111 annularly formed on the inner wall of the inner tooth 11 of the hub, and the side cover 12 The first side cover 12A and the second side cover 12B are respectively disposed at the two ends of the hub body 11 , wherein the first side cover 12A is fixed to the hub body The first side cover 12A is formed on the inner wall of the first side cover 12A, and the first side cover 12A and the hub body 11 are connected to each other. A bearing B1 is disposed. The main shaft 13 passes through the two side covers 12 and the hub body 11. A bearing B2 is disposed between the main shaft 13 and the second side cover 12B. The main shaft 13 includes three fixed clutch grooves 131. The first, second and third fixed clutch grooves 131A, 131B, 131C are respectively fixed clutches Recesses 131 are disposed at the outer wall of the main shaft 13 in different longitudinal positions.

Referring to FIG. 2, FIG. 5, and FIG. 6A to FIG. 6C, each of the fixed clutches 20 is a first, second, and third fixed clutches 20A, 20B, and 20C, respectively, and is respectively accommodated in the first and second portions. And the third fixed clutch grooves 131A, 131B, and 131C, each of the fixed clutches 20 includes a spring end 21 and a pawl 22, and the pawls 22 of each fixed clutch 20 are respectively located at different positions in the longitudinal direction of the main shaft 13, and are fixed at each position. The spring end 21 of the clutch 20 is also located at different positions in the longitudinal direction of the main shaft 13, and a pop-up spring S is respectively disposed between each fixed clutch groove 131 and the spring end 21 of each fixed clutch 20, and each pop-up spring S is supported at a corresponding position. The fixed clutch groove 131 is between the spring end 21 of the corresponding fixed clutch 20.

Referring to FIG. 4 , the transmission unit 30 is disposed on the hub unit 10 . The transmission unit 30 includes a sprocket 31 , a speed control sleeve 32 , three speed control rings 33 , and a control sleeve 34 . The sprocket 31 is disposed on a side of the first side cover 12A of the hub body 11. The sprocket 31 is used for interlocking a bicycle chain C. The speed control sleeve 32 is sleeved on the main shaft 13 and worn. A bearing B3 is disposed between the speed control sleeve 32 and the first side cover 12A, and a bearing B4 is also disposed between the speed control sleeve 32 and the main shaft 13. The speed control sleeve is disposed between the speed control sleeve 32 and the first side cover 12A. The cylinder 32 is used for connecting a bicycle shift control unit (not shown), and each speed control ring 33 is sleeved on the main shaft 13 and located in the speed control sleeve 32, and each speed regulating ring 33 and the speed control sleeve 32 is locked in the circumferential direction, so that when the speed control sleeve 32 rotates, the speed control ring 33 can be controlled to rotate, and each speed adjusting ring 33 is the first, second and third speed regulating ring 33A respectively. 33B, 33C, the inner side surface of each speed regulating ring 33 is provided with a plurality of ratchet teeth 331, and the ratchet teeth 331 of each speed regulating ring 33 are respectively located at different positions in the circumferential direction with respect to each other, The teeth 331 are selectively clamped to the pawls 22 of the corresponding fixed clutches 20 . The control sleeves 34 are sleeved on the speed control sleeve 32 and include a plurality of side plate clamping portions 341 and a plurality of side cover cards. The portion 342, each of the plurality of side plate locking portions 341 is formed at an end of the control sleeve 34 away from the sprocket 31, and each side cover locking portion 342 is formed on the outer wall of the control sleeve 34, and is clamped to each of the controls. The sleeve locking portion 121A allows the control sleeve 34 to rotate in synchronization with the first side cover 12A.

Referring to FIG. 2 , FIG. 4 , FIG. 7 and FIG. 8 , the first shifting unit 40 is disposed in the hub unit 10 and includes a first sun gear 41 and three first planetary gears 42 . The first sun gear 41 sets are disposed on the main shaft 13 and include a plurality of ratchet teeth 411. The ratchet teeth 411 are annularly formed on the inner side surface of the first sun gear 41, and are selectively opposite to the spring end 21 of the first fixed clutch 20A. The first planetary gears 42 are disposed around the first sun gear 41 and are engaged with the first sun gear 41.

The second shifting unit 50 is disposed in the hub unit 10 and includes a second sun gear 51 and three second planetary gears 52. The second sun gear 51 is sleeved on the main shaft 13 and includes a plurality of ratchet teeth 511. The ratchet teeth 511 are annularly formed on the inner side surface of the second sun gear 51, and are selectively engaged with the spring end 21 of the second fixed clutch 20B, and the second planetary gears 52 are circumferentially disposed on the second sun. The gear 51 is surrounded by the second sun gear 51.

Referring to FIG. 2, FIG. 7 and FIG. 9, the third shifting unit 60 is disposed in the hub unit 10, and includes a third sun gear 61 and three third planetary gears 62. The third sun gear 61 is sleeved. In the main shaft 13 and including a plurality of ratchet teeth 611, the ratchet teeth 611 are annularly formed on the inner side surface of the third sun gear 61, and are selectively engaged with the spring end 21 of the third fixed clutch 20C. Each of the third planetary gears 62 is disposed around the third sun gear 61 and is engaged with the third sun gear 62.

Referring to FIG. 2, FIG. 3, FIG. 4 and FIG. 7, the ring gear set 70 is disposed in the hub unit 10, and includes a three-ring gear 71 and three fourth planetary gears 72, wherein the ring gear 71 is respectively The first to third ring gears 71A, 71B, and 71C are sleeved on the first side cover 12A and include an inner tooth portion 711A and an outer tooth portion 712, and the inner tooth portion 711A is annularly formed at The inner side surface of the first ring gear 71A is engaged with the first planetary gears 42. The outer tooth portion 712 is formed on the outer side surface of the first ring gear 71A, and each of the fourth planetary gears 72 is disposed around the first ring gear 71. The outer gear portion 712 of the ring gear 71A is engaged with the outer tooth portion 712 and the hub inner tooth 111 of the hub body 11, and the second ring gear 71B is sleeved on the second shifting unit 50, and includes a The inner tooth portion 711B and the inner ratchet portion 713B are formed on the inner wall of the second ring gear 71B and mesh with the second planetary gears 52. The second ring The inner ratchet portion 713B of the gear 71B is formed on the inner wall of the second ring gear 71B, and the third ring gear 71C is sleeved on the first ring gear 7 1A, the second ring gear 71B and the third shifting unit 60. The third ring gear 71C includes an inner tooth portion 711C and an inner ratchet portion 713C. The inner tooth portion 711C and the inner ratchet portion 713C are both The inner ring portion 711C of the third ring gear 71C is engaged with each of the third planetary gears 62.

As shown in FIG. 2, FIG. 4, FIG. 7 and FIG. 8, the side panel group 80 is disposed in the hub unit 10, and includes five side panels 81 and a plurality of fixing bolts 82. The fifth side plate 81A, 81B, 81C, 81D, 81E is disposed on the main shaft 13 between the control sleeve 34 and the first shifting unit 40. The first side plate 81A includes a plurality of forms. The first side plate 81A faces the sleeve locking portion 811A of the control sleeve 34, and the sleeve clamping portion 811A and the side plate locking portion 341 of the control sleeve 34 are mutually engaged, and the second side plate 81B is sleeved. The third side plate 81C is sleeved between the first shifting unit 40 and the second shifting unit 50, and the third side plate 81C is disposed between the second shifting unit 50 and the second ring gear 71B. The fourth side plate 81D is sleeved between the third shifting unit 60 and the third ring gear 71C. The fifth side plate 81E has an annular shape and is sleeved on the first ring gear 71A. Located between the third ring gear 71C and each of the fourth planetary gears 72.

Each of the fixing bolts 82 is respectively inserted into the different side plates 71. The first fixing bolt 82A is simultaneously inserted into the first side plate 71A, one of the first planetary gears 42, the second side plate 71B, and one of the second planetary gears 52. The third side plate 71C, wherein the second fixing pin 82B is simultaneously inserted into the first, second and third side plates 71A, 71B, 71C, wherein the third fixing pin 82C is simultaneously inserted into the second ring gear 71B, a third planetary gear 62 and the fourth side plate 81D, wherein the fourth fixing bolt 82D is inserted into the fifth side plate 81E and the third ring gear 71C, wherein the plurality of fifth fixing bolts 82E are inserted into the fifth side plate 81E and one of the fourth planetary gears 72.

Referring to FIG. 2, FIG. 4 and FIG. 9, each one-way clutch 90 is disposed in the hub unit 10, which are first, second and third one-way clutches 90A, 90B, 90C, respectively, wherein the first single The clutch 90A is disposed around the third side plate 81C and selectively engages with the inner ratchet portion 713B of the second ring gear 71B. The second one-way clutch 90B is disposed around the fourth side plate 81D and is selectively Interspersed with the inner ratchet portion 713C of the third ring gear 71C, the third one-way clutch 90C has a total of four, disposed on the outer wall of the first side cover 12A, and selectively engages the first ring gear The inner wall of the 71A.

In use, before the shifting, the power is directly outputted by the sprocket 31 to drive the rear wheel W of the bicycle. When the shift is performed, the user controls the speed control sleeve 32 to rotate by the bicycle shift control unit. The speed control sleeve 32 is rotated to each of the speed control rings 33 to control the operation of different fixed clutches 20. In the process, according to different actuation states of the one-way clutch 90 and the fixed clutch 20, the present invention can achieve eight different output gear positions, each of which can achieve eight different output gear positions. For the operation of the gear position, please refer to the following Table 1. In Table 1, the "V" symbol indicates that each clutch is in the active state in the gear position, that is, it is engaged with the corresponding sun gear or ring gear.

Referring to Table 1, FIG. 2 and FIG. 11 , in the first gear position, the power is input into the speed control sleeve 32 and the first side cover 12A by the sprocket 31 and is divided into two, wherein FIG. 11 The flow direction of the power split is indicated by a thick black line, and the clutches are in an active state by a black square: Split 1: The first fixed clutch 20A is actuated and clamped to the first sun gear 41 to make the first sun gear 41 The rotation speed of the first ring gear 71A is greater than the rotation speed of the first side cover 12A, thereby generating an overspeed characteristic so that the third one-way clutches 90C are not actuated, and the power is transmitted to the fourth planetary gear 72 to the Hub body 11; splitter 2: since the second and third fixed clutches 20B, 20C are not actuated, the second and third sun gears 51, 61 are not fixed, and the second and third planet gears 52, 62 are rotated. Power can be directly transmitted to the hub body 11 by the first and second one-way clutches 90A, 90B. Therefore, the power flow collected to the hub body 11 can complete the shift of the first gear position due to the relative speed difference.

Referring to Table 1, FIG. 2 and FIG. 12, in the second gear position, the power is input into the speed control sleeve 32 and the first side cover 12A by the sprocket 31 and is divided into two, wherein FIG. 12 The thick black line indicates the flow direction of the power split, and the black squares indicate that the clutches are in the active state: the split one: the first fixed clutch 20A is not actuated, and the first sun gear 41 rotates to drive the first ring gear 71A to rotate. Each of the third one-way clutches 90C is actuated, and the first side cover 12A transmits power to the hub body 11 by actuation of the third one-way clutches 90C; the second two: the second and third fixed clutches 20B, 20C is not actuated, so the second and third sun gears 51, 61 are not fixed, and the second and third planetary gears 52, 62 are rotated, and the power can be directly transmitted to the first and second one-way clutches 90A, 90B. The hub body 11 is. Therefore, the power flow collected to the hub body 11 can be shifted in the second gear position due to the relative speed difference.

Referring to Table 1, FIG. 2 and FIG. 13 , in the third gear position, the power is input into the speed control sleeve 32 and the first side cover 12A by the sprocket 31 and is divided into two, wherein FIG. 13 The flow direction of the power split is indicated by a thick black line, and the clutches are in an active state by a black square: Split 1: The first fixed clutch 20A is actuated and clamped to the first sun gear 41 to make the first sun gear 41 The rotation speed of the first ring gear 71A is greater than the rotation speed of the first side cover 12A, thereby generating an overspeed characteristic so that the third one-way clutches 90C are not actuated, and the power is transmitted to the fourth planetary gear 72 to the The hub body 11; the splitter 2: the second fixed clutch 20B is actuated, the second sun gear 51 is fixed, the rotation speed of the second ring gear 71B is greater than the rotation speed of the first side cover 12A, and the overspeed characteristic is generated to make the first one-way The clutch 90A is not actuated, and power is transmitted to the hub body 11 by the second one-way clutch 90B. Therefore, the power flow collected to the hub body 11 can be shifted in the third gear position due to the relative speed difference.

Referring to Table 1, FIG. 2 and FIG. 14 , in the fourth gear position, the power is input into the speed control sleeve 32 and the first side cover 12A by the sprocket 31 and is divided into two, wherein FIG. 14 The thick black line indicates the flow direction of the power split, and the black squares indicate that the clutches are in the active state: the split one: the first fixed clutch 20A is not actuated, and the first sun gear 41 rotates to drive the first ring gear 71A to rotate. Each of the third one-way clutches 90C is actuated, and the first side cover 12A transmits power to the hub body 11 by actuation of each third one-way clutch 90C; and the second fixed clutch 20B is actuated. The second sun gear 51 is fixed. The rotation speed of the second ring gear 71B is greater than the rotation speed of the first side cover 12A. The overspeed characteristic is generated to disable the first one-way clutch 90A, and the power is transmitted to the second one-way clutch 90B. The hub body 11 is. Therefore, the power flow collected to the hub body 11 can be shifted in the fourth gear position due to the relative speed difference.

Referring to Table 1, FIG. 2 and FIG. 15, in the fifth gear position, the power is input into the speed control sleeve 32 and the first side cover 12A by the sprocket 31 and is divided into two, wherein FIG. 15 The flow direction of the power split is indicated by a thick black line, and the clutches are in an active state by a black square: Split 1: The first fixed clutch 20A is actuated and clamped to the first sun gear 41 to make the first sun gear 41 The rotation speed of the first ring gear 71A is greater than the rotation speed of the first side cover 12A, thereby generating an overspeed characteristic so that the third one-way clutches 90C are not actuated, and the power is transmitted to the fourth planetary gear 72 to the The hub body 11; the splitter 2: the third fixed clutch 20C is actuated, the third sun gear 61 is fixed, the rotation speed of the third ring gear 71C is greater than the rotation speed of the first side cover 12A, and the overspeed characteristic is generated to make the second single The clutch 90B is not actuated, the second fixed clutch 20B is not actuated, and the power is transmitted to the second sun gear 51, the second planetary gear 52, and the second ring gear 71B by the first one-way clutch 90A, and then transmitted to The hub body 11 is. Therefore, the power flow collected to the hub body 11 can be shifted in the fifth gear position due to the relative speed difference.

Referring to Table 1, FIG. 2 and FIG. 16, in the sixth gear position, the power is input from the sprocket 31 to the speed control sleeve 32 and the first side cover 12A, and is divided into two, wherein FIG. 16 The thick black line indicates the flow direction of the power split, and the black square indicates that the clutches are in the active state: the split one: the first fixed clutch is not activated by 20A, and the first sun gear 41 rotates to drive the first ring gear 71A to rotate. Each of the third one-way clutches 90C is actuated, and the first side cover 12A transmits power to the hub body 11 by actuation of each third one-way clutch 90C; and the second fixed clutch 20C is actuated. The third sun gear 61 is fixed, the rotation speed of the third ring gear 71C is greater than the rotation speed of the first side cover 12A, the overspeed characteristic is generated to make the second one-way clutch 90B not actuate, and the second fixed clutch 2B is actuated by the power. The first one-way clutch 90A is transmitted to the second sun gear 51, the second planetary gear 52, and the second ring gear 71B, and is transmitted to the hub body 11. Therefore, the power flow collected to the hub body 11 can be shifted in the sixth gear position due to the relative speed difference.

Referring to Table 1, FIG. 2 and FIG. 17, in the seventh gear position, the power is input into the speed control sleeve 32 and the first side cover 12A by the sprocket 31 and is divided into two, wherein FIG. 17 The flow direction of the power split is indicated by a thick black line, and the clutches are in an active state by a black square: Split 1: The first fixed clutch 20A is actuated and clamped to the first sun gear 41 to make the first sun gear 41 The rotation speed of the first ring gear 71A is greater than the rotation speed of the first side cover 12A, so that an overspeed characteristic is generated to disable the third one-way clutch 90A, and the power is transmitted to the fourth planetary gear 72. The hub body 11; the splitter 2: the second and third fixed clutches 20B, 20C are actuated, the second and third sun gears 51, 61 are fixed, and the rotation speed of the second ring gear 71B is greater than the rotation speed of the first side cover 12A The overspeed characteristic is caused to cause the second one-way clutch 90B to be inactive, and the power is directly transmitted to the hub body 11. Therefore, the power flow collected to the hub body 11 can be shifted in the seventh gear position due to the relative speed difference.

Referring to Table 1, FIG. 2 and FIG. 18, in the eighth gear position, the power is input into the speed control sleeve 32 and the first side cover 12A by the sprocket 31 and is divided into two, wherein FIG. 18 The thick black line indicates the flow direction of the power split, and the black squares indicate that the clutches are in the active state: the split one: the first fixed clutch 20A is not actuated, and the first sun gear 41 rotates to drive the first ring gear 71A to rotate. Each of the third one-way clutches 90C is actuated, and the first side cover 12A transmits power to the hub body 11 by actuation of the third one-way clutches 90C; the second two: the second and third fixed clutches 20B, 20C is actuated, the second and third sun gears 51, 61 are fixed, and the rotation speed of the second ring gear 71B is greater than the rotation speed of the first side cover 12A, so that the overspeed characteristic causes the second one-way clutch 90B to be inactive, and the power is directly It is transmitted to the hub body 11. Therefore, the power flow collected to the hub body 11 can be shifted in the eighth gear position due to the relative speed difference.

10‧‧‧Wheel unit
11‧‧·Wheel body
111‧‧·Inner hub
12‧‧‧ side cover
12A‧‧‧ first side cover
121A‧‧‧Control sleeve clamping department
12B‧‧‧Second side cover
13‧‧‧ Spindle
131‧‧‧Fixed clutch groove
131A, 131B, 131C‧‧‧ first, second and third fixed clutch slots
20‧‧‧Fixed clutch
20A, 20B, 20C‧‧‧ first, second and third fixed clutches
21‧‧‧Spring end
22‧‧‧ pawl
30‧‧‧Transmission unit
31‧‧‧Sprocket
32‧‧‧Speed sleeve
33‧‧‧Speed ring
33A, 33B, 33C‧‧‧ first, second and third speed rings
331‧‧‧ ratchet
34‧‧‧Control sleeve
341‧‧‧ Side Panel Carding Department
342‧‧‧ Side Cover Carding Department
40‧‧‧First shifting unit
41‧‧‧First sun gear
411‧‧‧ ratchet
42‧‧‧First planetary gear
50‧‧‧Second gear unit
51‧‧‧second sun gear
511‧‧‧ ratchet
52‧‧‧Second planetary gear
60‧‧‧3rd shifting unit
61‧‧‧ Third sun gear
611‧‧‧ ratchet
62‧‧‧ Third planetary gear
70‧‧‧ring gear set
71‧‧‧ring gear
71A, 71B, 71C‧‧‧ first to third ring gears
711A, 711B, 711C‧‧‧ internal tooth
712‧‧‧ external teeth
713A, 713B, 713C‧‧‧ internal ratchet
72‧‧‧fourth planetary gear
80‧‧‧ side panel
81‧‧‧ side panels
81A, 81B, 81C, 81D, 81E‧‧‧ first to fifth side panels
811A‧‧‧Sleeve Carding Department
82‧‧‧fixing bolt
82A, 82B, 82C, 82D, 82E‧‧‧ first to fifth fixing bolts
90‧‧‧ one-way clutch
90A, 90B, 90C‧‧‧ first to third one-way clutches
B1‧‧‧ bearing
B2‧‧‧ bearing
B3‧‧‧ bearing
B4‧‧‧ bearing
C‧‧‧Bicycle chain
S‧‧ ‧ spring
W‧‧‧ bicycle rear wheel

1 is a schematic view of a preferred embodiment of the present invention disposed in a rear wheel of a bicycle. Figure 2 is a cross-sectional side view of a preferred embodiment of the present invention. Figure 3 is an exploded perspective view of a preferred embodiment of the present invention. 4 and 5 are perspective exploded views of some components of the preferred embodiment of the present invention. 6A to 6C are cross-sectional front views of the respective speed control ring and fixed clutch. 7 to 9 are exploded perspective views of some of the components of the preferred embodiment of the present invention. Figure 10 is a schematic illustration of a preferred embodiment of the present invention. Figure 11 is a schematic view showing the operation of the first gear position in the preferred embodiment of the present invention. Figure 12 is a schematic view showing the operation of the second gear position according to the preferred embodiment of the present invention. FIG. 13 is a schematic diagram of the operation of the third gear position according to the preferred embodiment of the present invention. Figure 14 is a schematic view showing the operation of the fourth gear position in the preferred embodiment of the present invention. Figure 15 is a schematic view showing the operation of the fifth gear position in the preferred embodiment of the present invention. Figure 16 is a schematic view showing the operation of the sixth gear position in the preferred embodiment of the present invention. Figure 17 is a schematic view showing the operation of the seventh gear position in the preferred embodiment of the present invention. Figure 18 is a schematic view showing the operation of the eighth gear position in the preferred embodiment of the present invention.

11‧‧·Wheel body

31‧‧‧Sprocket

C‧‧‧Bicycle chain

W‧‧‧ bicycle rear wheel

Claims (2)

A bicycle eight-speed internal transmission includes: a hub unit including a hub body, two side covers, and a main shaft, wherein the hub body is hollow and includes a hub inner tooth formed on the inner side, and the two side covers are respectively disposed At the two ends of the hub and respectively being first and second side covers, the main shaft passes through the two side covers and the hub; three fixed clutches, which are respectively provided by the first, second and third fixed clutches The different longitudinal positions of the main shafts, each of the fixed clutches includes a spring end and a pawl, the pawls of each fixed clutch are respectively located at different positions in the longitudinal direction of the main shaft, and the spring ends of the fixed clutches are also located at different positions in the longitudinal direction of the main shaft. Wherein, a spring is disposed between each of the spring ends and the main shaft; a transmission unit is disposed on the hub unit, and includes a sprocket, a speed control sleeve, three speed control rings and a control sleeve, wherein The sprocket is disposed on one side of the first side cover, the speed control sleeve is sleeved on the main shaft, passes through the first side cover, and each speed regulating ring is not the first, second and third speed regulation The sleeve is disposed in the speed control sleeve, and the speed control ring and the speed control sleeve are circumferentially clamped, and the inner side surfaces of each speed control ring are provided with a plurality of ratchet teeth, each The ratchet teeth of the speed regulating ring are respectively located at different positions in the circumferential direction with respect to each other, and the control sleeve is sleeved on the adjusting sleeve, and the outer wall of the control sleeve is circumferentially locked with the first side cover; a first shifting unit disposed in the hub unit, including a first sun gear and a plurality of first planet gears, wherein the first sun gear is sleeved on the main shaft, and an inner side of the first sun gear is The spring end of the first fixed clutch is selectively engaged, and each of the first planetary gears is disposed around the first sun gear in a snap-fit manner; a second shifting unit is disposed in the hub unit, including a first a second sun gear and a plurality of second planetary gears, wherein the second sun gear is sleeved on the main shaft, and an inner side of the second sun gear is selectively engaged with a spring end of the second fixed clutch, each Second planetary gear ring a third shifting unit disposed in the hub unit, including a third sun gear and a plurality of third planetary gears, wherein the third sun gear is sleeved In the main shaft, the inner side of the third sun gear is selectively engaged with the spring end of the third fixed clutch, and each of the third planetary gears is disposed around the third sun gear in a snap-fit manner; a ring gear set Included in the hub unit, and including a three-ring gear and a plurality of fourth planetary gears, wherein each of the ring gears is a first, a second, and a third ring gear, and the first ring gear is sleeved at the first The side cover includes an inner tooth portion and an outer tooth portion, and the inner tooth portion is engaged with each of the first planetary gears, and each of the fourth planetary gears is disposed around the outer tooth portion of the first ring gear. The second ring gear is sleeved on the second shifting unit, and includes an inner tooth portion and an inner ratchet portion. The inner tooth portion of the second ring gear meshes with each of the second planetary gears, and the third ring gear sleeve is sleeved. In the first ring gear The second ring gear and the third shifting unit include an internal tooth portion and an internal ratchet portion, the internal tooth portion of the third ring gear meshes with each of the third planetary gears; The hub unit includes five side plates and at least five fixing bolts, each of the side plates being first, second, third, fourth and fifth side plates respectively, the first side plate is located at the control sleeve and the first shifting plate Between the units, and circumferentially locking with the control sleeve, the second side plate is located between the first shifting unit and the second shifting unit, the third side plate is located at the second shifting unit and the Between the second ring gears, the fourth side plate is located between the third shifting unit and the third ring gear, and the fifth side plate is sleeved on the first ring gear, the third ring gear and each fourth planet Between the gears, each of the at least five fixing bolts is a first, a second, a third, a fourth, and a fifth fixing bolt, and the first fixing bolt is inserted into the first side panel, wherein the first planetary gear, the second a side plate, one of the second planetary gears and the third side plate, The second fixing bolt is inserted into the first, second and third side plates, and the third fixing bolt is inserted into the second ring gear, one of the third planetary gears and the fourth side plate, and the fourth fixing bolt is inserted in the a fifth side plate and the third ring gear, the fifth fixing bolt is inserted in the fifth side plate and one of the fourth planetary gears; and the three one-way clutch is disposed in the hub unit, respectively being the first and second a third one-way clutch, wherein the first one-way clutch is disposed around the third side plate and selectively engages an inner ratchet portion of the second ring gear, and the second one-way clutch is disposed on the fourth side plate The third one-way clutch is disposed around the outer wall of the first side cover and selectively engages the inner wall of the first ring gear. The bicycle eight-speed internal transmission according to claim 1, wherein the main shaft is recessed with three fixed clutch grooves respectively corresponding to the fixed clutches, and the fixed clutch grooves are respectively recessed at different longitudinal positions of the outer wall of the main shaft and are accommodated respectively. The fixed clutches are respectively disposed in the respective fixed clutch grooves.