TWM504890U - Continuous variable speed device of power-assisting bicycle - Google Patents

Description

Stepless speed change device for assisting bicycle

This creation department is related to the shifting technology of bicycles, especially a stepless speed change device for assisting bicycles.

Conventional bicycle stepless transmission systems mostly use a combination of planetary gears to match the dynamics of the motor drive and the rider's pedaling drive. The main purpose is to connect the sun gear or the planetary gear carrier to the motor and the rider's pedaling source, respectively. The effect of the stepless shifting is achieved by controlling the driving speed of the motor.

In our TW 201404657 patent, a power system is disclosed, which mainly utilizes two motors to cooperate with a planetary gear set to achieve a stepless shifting effect on the bicycle. However, in this case, only one motor acts directly on the planetary gear set, while the other motor provides assistance to assist the pedaling force. This method can assist the pedaling action, but when the motor providing the assist fails, There will be a problem that the driving force of the stepless shifting is too large and the rider feels the reverse force when stepping on.

In addition, in the Japanese Patent No. 1,360,483, a transmission system of a dual planetary gear set and a dual motor is disclosed. Although the two motors respectively drive a planetary gear set without the problems of the prior art described above, The structure is complex and extremely large, and it is not easy to be applied to bicycles. If such a structure uses a small-sized motor, there is a problem that the driving force is insufficient.

The main purpose of the present invention is to provide a stepless shifting device for assisting bicycles, which can be more compact and smaller in size than the prior art, and also achieves the effect of providing assistance and stepless shifting by using two motors.

According to the present invention, a stepless speed change device for assisting a bicycle includes: a planetary gear set, which mainly has a planetary gear carrier, a plurality of double-order planetary gears disposed on the planetary gear carrier, and a first sun. a gear, a second sun gear and an inner ring gear, wherein each of the double-stage planetary gear trains is composed of a coaxial and co-moving large gear and a pinion gear, and the first sun gear train is engaged with the plurality of double-order gears a pinion gear of the planetary gear, the second sun gear is meshed with the large gear of the plurality of double-stage planetary gears; and a pair of motor motors having an outer rotor, an outer stator, an inner stator and an inner rotor, the outer gear The stator surrounds the outer side of the inner stator and is disposed together with the inner stator on a certain sub-bracket, the inner rotor is disposed on the second sun gear, the outer rotor is disposed on the inner ring gear, and the outer rotor and the outer stator The spatial relationship between the inner stator, the inner rotor, the first sun gear and the second sun gear is coaxial with a crankshaft or a rear axle of a bicycle; wherein the first The male gear is rotated by the pedaling force source connected to the pedaling force source of the bicycle by a one-way device, and the planetary gear carrier is directly or indirectly connected to the bicycle power wheel to drive the power when rotating The second sun gear is pivotally connected to the crankshaft or the rear axle by at least one bearing.

Thereby, the dual motor motor can be utilized to provide the effect of assisting and stepless shifting, and is structurally simpler and smaller in size than the prior art.

In order to explain in detail the technical features of the present invention, the following preferred embodiments are described below with reference to the following:

As shown in FIG. 1 , a stepless speed change device 10 for assisting a bicycle according to a first preferred embodiment of the present invention is mainly composed of a planetary gear set 11 and a double motor motor 21, wherein:

The planetary gear set 11 mainly has a planetary gear carrier 12, a plurality of double-stage planetary gears 14 disposed on the planetary gear carrier 12, a first sun gear 16, a second sun gear 17, and an inner ring gear 18, wherein Each of the two-stage planetary gears 14 is composed of a coaxial and co-operating large gear 141 and a small gear 142. The first sun gear 16 is coupled to the pinion 142 of the plurality of double-stage planetary gears 14 . The two sun gears 17 are engaged with the large gears 141 of the plurality of double-stage planetary gears 14. In the present embodiment, the large gear 141 and the small gear 142 of each of the double-stage planetary gears 14 are integrally formed.

The dual motor 21 has an outer rotor 22, an outer stator 23, an inner stator 26 and an inner rotor 27. The outer stator 23 surrounds the outer side of the inner stator 26 and is disposed together with the inner stator 26 on a certain sub-bracket. The inner rotor 27 is disposed on the second sun gear 17, and the outer rotor 22 is disposed on the inner ring gear 18, and the outer rotor 22, the outer stator 23, the inner stator 26, the inner rotor 27, The spatial relationship between the first sun gear 16 and the second sun gear 17 is coaxial with a crankshaft 91 (not shown) or a rear axle 97 (shown in FIG. 2).

The first sun gear 16 is connected to the pedaling force source 93 of the bicycle by a one-way device 161 and is rotated by the pedaling force source 93. The planetary gear carrier 12 is coupled to the bicycle power wheel (Fig. In the first embodiment, the rear wheel is exemplified by a direct or indirect connection, and the power wheel is driven during rotation. The second sun gear 17 is pivotally connected to the crankshaft 91 by a plurality of bearings 171 or The rear axle 97. The number of bearings to be set depends on the actual demand and the specifications of the bearing, one or more.

In the first embodiment, the spatial relationship between the outer rotor 22, the outer stator 23, the inner stator 26, the inner rotor 27, the first sun gear 16, and the second sun gear 17 is the crank. The shaft 91 is coaxial with the shaft center. The pedaling force source 93 is a pedal 931 connected to the crankshaft 91. The first sun gear 16 is disposed on the crankshaft 91 by the one-way device 161. The stator bracket 29 is fixed to the bicycle, the planet. The gear carrier 12 is coupled to the bicycle in the bicycle 95 and is indirectly coupled to the bicycle's power wheel by a chain (not shown).

Further, in the present embodiment, the combination of the inner rotor 27 and the inner stator 26 is defined as a booster motor, and the combination of the outer rotor 22 and the outer stator 23 is defined as a variable speed motor.

The architecture of the first embodiment has been described above, and the operational state of the first embodiment will be described next.

Referring to FIG. 1 again, when the rider steps on the pedal, the crankshaft 91 is rotated by the pedaling force source 93, and the first sun gear 16 is unidirectionally driven by the action of the one-way device 161. The rotation of the first sun gear 16 drives the plurality of double-stage planetary gears 14 to rotate, and the plurality of double-stage planetary gears 14 drives the second sun gear 17 and the ring gear 18 to rotate. At this time, since the driving force provided by the assist motor (ie, the combination of the inner stator 26 and the inner rotor 27) acts on the second sun gear 17 to drive the plurality of double-step planetary gears 14, the assist motor The driving force provided can be linked to the pedaling force, which can provide the boosting effect. Since the driving force provided by the variable speed motor (ie, the combination of the outer rotor 22 and the outer stator 23) acts on the ring gear 18, the rotation speed of the ring gear 18 affects the plurality of double-order planetary gears. The moving speed of 14 , that is, affecting the rotational speed of the planetary gear carrier 12 , thus affecting the speed at which the power wheel is driven, that is, changing the speed of the ring gear 18 can change the gear ratio to achieve stepless shifting. effect. It can be seen from the structure of the first embodiment that not only the assisting motor can be used to provide the assisting force for stepping, but also the effect of the stepless shifting can be provided by the variable speed motor.

Since the assist motor and the variable speed motor are internally and externally coaxial with the crankshaft 91, and the two-stage planetary gears 14 are co-operating and can be fabricated together, after assembly, the structure is integrally assembled. It is more streamlined and smaller than the previous technology.

Referring to FIG. 2, a stepless speed change device 30 for assisting a bicycle according to a second preferred embodiment of the present invention is mainly similar to the first embodiment disclosed above, except that:

The spatial relationship between the outer rotor 42, the outer stator 43, the inner stator 46, the inner rotor 47, the first sun gear 36, and the second sun gear 37 is coaxial with the rear axle 97 as an axis. The pedaling force source 93 is a toothed disc 932 connected to a bicycle pedal (not shown) by a chain (not shown), and the toothed disc 932 is pivotally mounted to the rear axle 97 by a plurality of bearings 933. The first sun gear 36 is disposed on the toothed disc 932 by a one-way device 361. The stator bracket 49 is fixed to the rear axle 97. The planetary gear carrier 32 is coupled to the rear wheel hub 98 of the bicycle. The bicycle's power wheel is directly connected, wherein the bicycle rear hub 98 is pivotally mounted to the rear axle 97 by a bearing 981 and is disposed on the chainring 932 by another one-way 982. Further, the second sun gear 37 is pivotally connected to the rear axle 97 by a plurality of bearings 371.

The state of the architecture of the second embodiment at the time of operation is explained below.

Referring to FIG. 2 again, when the rider steps on the pedal, the pedal is driven to drive the chain 932 to rotate, and the first sun gear 36 is unidirectionally driven by the action of the one-way device 361. The rotation of the first sun gear 36 drives the plurality of double-stage planetary gears 34 to rotate, and the plurality of double-stage planetary gears 34 drive the second sun gear 37 and the ring gear 38 to rotate. At this time, since the driving force provided by the assist motor (ie, the combination of the inner stator 46 and the inner rotor 47) acts on the second sun gear 37 to drive the plurality of double-step planetary gears 34, the assist motor The driving force provided can be linked to the pedaling force, which can provide the boosting effect. Since the driving force provided by the variable speed motor (ie, the combination of the outer rotor 42 and the outer stator 43) acts on the inner ring gear 38, the rotation speed of the inner ring gear 38 affects the plurality of double-order planetary gears. The moving speed of 34, that is, affecting the rotational speed of the planetary gear carrier 32, thus affecting the speed at which the bicycle rear hub 98 (i.e., the power wheel) is driven, that is, changing the speed of the inner ring gear 38 can change the speed ratio. And achieve the effect of stepless speed change.

The sprocket 932 is connected to the first sun gear 361 and the rear hub 98 by two one-way devices 361, 982 respectively. During the riding, if the speed of stepping on the sprocket 932 is greater than or equal to The rotational speed of the planetary gear carrier 32 causes the rider to feel the feeling of exerting a pedaling force, and if the rotational speed of the pedal gear 932 is less than the rotational speed of the planetary gear carrier 32, the rider feels empty. feel.

The remaining structure of the second embodiment and the achievable functions are the same as those of the first embodiment, and will not be further described.

10‧‧‧Stepless gearbox for assisting bicycles
11‧‧‧ planetary gear set
12‧‧‧ Planetary Gear Bracket
14‧‧‧Double-order planetary gears
141‧‧‧big gear
142‧‧‧ pinion
16‧‧‧First sun gear
161‧‧‧One-way device
17‧‧‧second sun gear
171‧‧‧ bearing
18‧‧‧ Inner ring gear
21‧‧‧Double motor
22‧‧‧Outer rotor
23‧‧‧Outer stator
26‧‧‧ inner stator
27‧‧‧ Inner rotor
29‧‧‧stator bracket
30‧‧‧Stepless gearbox for assisting bicycles
32‧‧‧ Planetary Gear Bracket
34‧‧‧Double-order planetary gears
36‧‧‧First sun gear
361‧‧‧One-way device
37‧‧‧second sun gear
371‧‧‧ bearing
38‧‧‧ Inner ring gear
42‧‧‧Outer rotor
43‧‧‧Outer stator
46‧‧ ‧ inner stator
47‧‧‧ inner rotor
49‧‧‧stator bracket
91‧‧‧ crankshaft
93‧‧‧Ten source
931‧‧‧ pedal
932‧‧‧ toothed disc
933‧‧‧ bearing
95‧‧‧ center toothed disc
97‧‧‧ Rear axle
98‧‧‧ rear wheel hub
981‧‧‧ bearing
982‧‧‧ one-way device

Figure 1 is a schematic cross-sectional view showing a first preferred embodiment of the present invention. Figure 2 is a schematic cross-sectional view showing a second preferred embodiment of the present invention.

10‧‧‧Stepless gearbox for assisting bicycles

11‧‧‧ planetary gear set

12‧‧‧ Planetary Gear Bracket

14‧‧‧Double-order planetary gears

141‧‧‧big gear

142‧‧‧ pinion

16‧‧‧First sun gear

161‧‧‧One-way device

17‧‧‧second sun gear

171‧‧‧ bearing

18‧‧‧ Inner ring gear

21‧‧‧Double motor

22‧‧‧Outer rotor

23‧‧‧Outer stator

26‧‧‧ inner stator

27‧‧‧ Inner rotor

29‧‧‧stator bracket

91‧‧‧ crankshaft

93‧‧‧Ten source

931‧‧‧ pedal

95‧‧‧ center toothed disc

Claims (4)

A stepless transmission for assisting a bicycle includes: a planetary gear set, mainly comprising a planetary gear carrier, a plurality of double-order planetary gears disposed on the planetary gear carrier, a first sun gear, a second sun gear, and a An inner ring gear, wherein each of the two-step planetary gear trains is composed of a large coaxial gear and a small gear that is coupled to the pinion gear of the plurality of double-stage planetary gears, the second gear a sun gear is coupled to the large gear of the plurality of double-stage planetary gears; and a pair of motor motors having an outer rotor, an outer stator, an inner stator and an inner rotor, the outer stator surrounding the outer side of the inner stator and The inner stator is disposed in a certain sub-bracket, the inner rotor is disposed on the second sun gear, the outer rotor is disposed on the inner ring gear, and the outer rotor, the outer stator, the inner stator, the inner rotor, The spatial relationship between the first sun gear and the second sun gear is coaxial with a crankshaft or a rear axle of a bicycle; wherein the first sun gear is coupled by a one-way device Connected to the pedaling force source of the bicycle and rotated by the pedaling force source, the planetary gear carrier is directly or indirectly connected to the power wheel of the bicycle to drive the power wheel when rotating, the second sun gear is driven by At least one bearing is pivotally connected to the crankshaft or the rear axle. A stepless speed change device for a bicycle according to claim 1, wherein: the outer rotor, the outer stator, the inner stator, the inner rotor, the first sun gear, and the second sun gear have a spatial relationship When the crankshaft is coaxial and coaxial, the pedaling force source is a pedal connected to the crankshaft, and the first sun gear is disposed on the crankshaft by the one-way device, and the stator bracket is fixed on the crankshaft In the bicycle, the planetary gear carrier is coupled to the bicycle toothed disk and is indirectly connected to the bicycle power wheel by a chain. A stepless speed change device for a bicycle according to claim 1, wherein: the outer rotor, the outer stator, the inner stator, the inner rotor, the first sun gear, and the second sun gear have a spatial relationship When the rear axle is coaxial and coaxial, the pedaling source is a toothed disc connected to the bicycle pedal by a chain, and the toothed disc is pivoted to the rear axle by at least one bearing, the first The sun gear is disposed on the toothed disc by the one-way device, and the stator bracket is fixed to the rear axle. The planetary gear carrier is coupled to the rear hub of the bicycle to directly connect with the power wheel of the bicycle. A stepless speed change device for a bicycle according to claim 1, wherein the combination of the inner rotor and the inner stator is defined as a booster motor, and the combination of the outer rotor and the outer stator is defined as a variable speed motor.