TWM593362U - Harmonic drive system for pedal electric cycle - Google Patents

Abstract

A harmonic drive system of an electric power-assisted vehicle arranged in a frame of an electric power-assisted vehicle includes a transmission gear device. The transmission gear device includes a harmonic reducer, a steering gear set, and a first one-way clutch. The harmonic reducer includes a flexible wheel, a rigid wheel, an elliptical cam constituting a wave generator, and a flexible bearing. One of the inner rings of the flexible bearing is provided for accommodating an elliptical cam, so that the flexible bearing becomes elliptical. One of the flexible wheels has a flexible external gear at the first end. One inner ring of the first end of the flexible wheel is used to accommodate the wave generator, so that the shape of the first end of the flexible wheel becomes elliptical. The rigid wheel has a rigid wheel internal gear for meshing with the flexible wheel external gear. The steering gear set has a first input part, a second input part and an output part. The first input part is connected to the second end of the flexible wheel. The output part is for connecting with one of the chain wheels of the electric moped. The first one-way clutch is accommodated in an inner ring of the second input portion of the steering gear set. An inner ring of the first one-way clutch is provided for accommodating a center axle of the electric moped. A first input rotation axis of the first input part is not parallel to a second input rotation axis of the second input part.

Description

Harmonic drive system of electric moped

This creation relates to a harmonic drive system for electric mopeds, especially an electric moped drive system with a harmonic reducer.

Please refer to FIG. 13, which is a schematic cross-sectional view of an embodiment of a planetary gear transmission device of a conventional electric power-assisted vehicle. The planetary gear transmission 9 includes an electric motor 92, a hollow connecting shaft 93, a braking device 98, a hollow gear 94, a sun gear 96, three planet gears 95, and a planet gear carrier 99. Please also refer to FIG. 14, which is a partially enlarged schematic cross-sectional view of an embodiment of the conventional technology shown in FIG. The hollow gear 94 has an internal gear and an external gear. The center wheel 96 has an external gear. The three planet gears 95 each have an external gear. The three planetary gears 95 mesh with the inner gear of the hollow gear 94 and the outer gear of the center gear 96, respectively. The planet gear carrier 99 series is connected to the three planet gears 95 respectively. The gear train outside the hollow gear 94 meshes with the links of a chain 97 of one of the electric mopeds. The middle shaft 91 of one of the electric mopeds passes through the center of the hollow connecting shaft 93 and is fixedly connected to the planet gear carrier 99. The hollow connecting shaft 93 is fixedly connected to the electric motor 92 and also fixedly connected to the center wheel 96. The conventional technology uses the planetary gear transmission device 9, which mainly has the disadvantages of lower speed reduction, heavier weight, larger volume, larger noise and lower transmission accuracy. Due to its relatively low deceleration and heavy weight, the power demand for the electric motor is large, which in turn affects the battery's endurance. In addition, high noise and low transmission accuracy will affect the user's riding comfort degree. Furthermore, the larger size will affect the aesthetic design of the electric moped.

In view of this, the creator has developed a simple assembly design, which can avoid the above-mentioned shortcomings, is easy to install, and has the advantages of low cost, taking into account the flexibility of use and economic considerations, so the creation of this creation.

The technical problem to be solved in this creation is how to reduce the weight, volume, and noise of the harmonic drive system of the electric moped, and at the same time improve the reduction ratio of the harmonic drive system of the electric moped, and improve the transmission accuracy, thereby improving battery endurance and riding Time comfort, and aesthetic design to enhance the appearance.

In order to solve the aforementioned problems and achieve the desired effect, the present invention provides a harmonic drive system for an electric moped, which is installed in one of the frames of an electric moped. The harmonic drive system of the electric moped includes a transmission gear device. The transmission gear device includes a wave generator, a flexible wheel, a rigid wheel, a steering gear set, and a first one-way clutch. The wave generator includes an elliptical cam and a flexible bearing. The flexible bearing has an inner ring for accommodating an elliptical cam, so that the flexible bearing becomes elliptical. The flexible wheel has a first end and a second end. The first end of the flexible wheel has a flexible wheel external gear and an inner ring. The inner ring at the first end of the flexible wheel is for accommodating a wave generator to make the flexible wheel The first end of the shape becomes elliptical. The rigid wheel has a rigid wheel internal gear for meshing with the flexible wheel external gear. The steering gear set has a first input part, a second input part and an output part. The first input part is connected to the second end of the flexible wheel, the second input part has an inner ring, and the output part is provided for electric A chain disc of a moped is connected, and a first input rotation axis of the first input part is not parallel to a second input rotation axis of the second input part. The first one-way clutch is accommodated in the inner ring of the second input part of the steering gear set, and the first one-way clutch has an inner ring for accommodating One of the bottom axles of electric mopeds.

In addition, this creation also provides a harmonic drive system for electric mopeds, which is set in a frame of an electric moped. The harmonic drive system for electric mopeds includes a transmission motor device and a transmission gear device. The transmission motor device includes an electric motor. The electric motor has a motor output shaft. The transmission gear device includes a wave generator, a flexible wheel, a rigid wheel, a steering gear set, and a first one-way clutch. The wave generator includes an elliptical cam and a flexible bearing. The elliptical cam has an inner ring that is connected to the output shaft of the motor. The flexible bearing has an inner ring for accommodating an elliptical cam, so that the flexible bearing becomes elliptical. The flexible wheel has a first end and a second end. The first end of the flexible wheel has a flexible wheel external gear and an inner ring. The inner ring at the first end of the flexible wheel is for accommodating a wave generator to make the flexible wheel The first end of the shape becomes elliptical. The rigid wheel has a rigid wheel internal gear for meshing with the flexible wheel external gear. The steering gear set has a first input part, a second input part and an output part. The first input part is connected to the second end of the flexible wheel, the second input part has an inner ring, and the output part is provided for electric A chain disc of a moped is connected, and a first input rotation axis of the first input part is not parallel to a second input rotation axis of the second input part. The first one-way clutch is accommodated in the inner ring of the second input portion of the steering gear set. The first one-way clutch has an inner ring for accommodating a central axle of the electric moped.

In an embodiment, the steering gear set includes a first gear member and a second gear member. The first gear member includes a first gear and a first connecting shaft. The first input portion of the steering gear set is located at a first end of the first connecting shaft, and the first gear system is connected to a second end of the first connecting shaft. The second gear member includes a second gear and a second connecting shaft. The second input portion of the steering gear set is located at one of the first ends of the second connecting shaft, the second gear system is connected to the first end of the second connecting shaft, and the output portion of the steering gear set is located at one of the second connecting shafts The second end. its The first gear of the first gear member meshes with the second gear of the second gear member.

In an embodiment, the combination of the first gear and the second gear includes one selected from the group consisting of a combination of two bevel gears, a combination of two halberd gears, a combination of an external gear and a side gear, A combination of a worm gear and a cylindrical worm, and a combination of a worm gear and a drum-shaped worm.

In addition, this creation provides a harmonic drive system for an electric moped, which is set in a frame of an electric moped. The harmonic drive system for an electric moped includes a transmission gear device. The transmission gear device includes a wave generator, a flexible wheel, a rigid wheel, a parallel shaft gear set, and a first one-way clutch. The wave generator includes an elliptical cam and a flexible bearing. The flexible bearing has an inner ring for accommodating an elliptical cam, so that the flexible bearing becomes elliptical. The flexible wheel has a first end and a second end. The first end of the flexible wheel has a flexible wheel external gear and an inner ring. The inner ring at the first end of the flexible wheel is for accommodating a wave generator to make the flexible wheel The first end of the shape becomes elliptical. The rigid wheel has a rigid wheel internal gear for meshing with the flexible wheel external gear. The parallel shaft gear set has a first input part, a second input part and an output part. The first input part is connected to the second end of the flexible wheel, the second input part has an inner ring, and the output part is provided with A chain disc of the electric power-assisted vehicle is connected, and a first input rotation axis of the first input part is parallel to a second input rotation axis of the second input part. The first one-way clutch is accommodated in the inner ring of the second input portion of the parallel shaft gear set. The first one-way clutch has an inner ring for accommodating a middle shaft of the electric moped.

In addition, the author also provides a harmonic drive system for an electric moped, which is set in a frame of an electric moped. The harmonic drive system for an electric moped includes a transmission motor device and a transmission gear device. The transmission motor device includes an electric motor. The electric motor has a motor output shaft. The transmission gear device includes a wave generator, a flexible wheel, a rigid wheel, and a parallel shaft Gear set and a first one-way clutch. The wave generator includes an elliptical cam and a flexible bearing. The elliptical cam has an inner ring that is connected to the output shaft of the motor. The flexible bearing has an inner ring for accommodating an elliptical cam, so that the flexible bearing becomes elliptical. The flexible wheel has a first end and a second end. The first end of the flexible wheel has a flexible wheel external gear and an inner ring. The inner ring at the first end of the flexible wheel is for accommodating a wave generator to make the flexible wheel The first end of the shape becomes elliptical. The rigid wheel has a rigid wheel internal gear for meshing with the flexible wheel external gear. The parallel shaft gear set has a first input part, a second input part and an output part. The first input part is connected to the second end of the flexible wheel, the second input part has an inner ring, and the output part is provided with A chain disc of the electric power-assisted vehicle is connected, and a first input rotation axis of the first input part is parallel to a second input rotation axis of the second input part. The first one-way clutch is accommodated in the inner ring of the second input portion of the parallel shaft gear set. The first one-way clutch has an inner ring for accommodating a middle shaft of the electric moped.

In an embodiment, the parallel shaft gear set includes a first gear member and a second gear member. The first gear member includes a first gear and a first connecting shaft. The first input portion of the parallel shaft gear set is located at a first end of the first connecting shaft, and the first gear system is connected to a second end of the first connecting shaft. The second gear member includes a second gear and a second connecting shaft. The second input part of the parallel shaft gear set is located at a first end of the second connecting shaft, the second gear system is connected to the first end of the second connecting shaft, and the output portion of the parallel shaft gear set is located at the second connecting shaft One of the second end. The first gear of the first gear member meshes with the second gear of the second gear member.

In an embodiment, the combination of the first gear and the second gear includes one selected from the group consisting of: a combination of two external gears, a combination of two helical gears, and a combination of an external gear and an internal gear combination.

In an embodiment, the second gear has a second number of teeth and a first tooth The ratio of the first number of teeth of the wheel is greater than or equal to 1 and less than or equal to 2.

In an embodiment, the transmission gear device further includes at least one first bearing, and the at least one first bearing has an inner ring for accommodating the first connecting shaft of the first gear member.

In an embodiment, at least one of the first bearings includes at least one selected from the group consisting of a ball bearing and a needle bearing.

In an embodiment, the transmission gear device further includes a retaining ring for the hole, at least one first bearing has an outer ring, and the retaining ring for the hole is used to fix the outer ring of the at least one first bearing.

In an embodiment, the flexible wheel further includes a fixed portion, the first gear member further includes a fixed portion, at least one first bearing has an inner ring, the fixed portion of the flexible wheel and the fixed portion of the first gear member are provided Fix the inner ring of at least one first bearing.

In an embodiment, the transmission gear device further includes at least one second bearing. The at least one second bearing has an inner ring for accommodating the second connecting shaft of the second gear member.

In an embodiment, the at least one second bearing includes at least one selected from the group consisting of a ball bearing and a needle bearing.

In an embodiment, the transmission gear device further includes at least one third bearing, the second end of the first connecting shaft further includes a connecting shaft protrusion, and at least one third bearing has an inner ring for accommodating connection Shaft protrusion.

In one embodiment, at least one third bearing includes at least one selected from the group consisting of a ball bearing and a needle bearing.

In one embodiment, the ball bearing is a deep groove ball bearing.

In an embodiment, the first gear member further includes a second one-way clutch. The second one-way clutch has an inner ring for accommodating the second end of the first connecting shaft. The first gear There is an inner ring for accommodating the second one-way clutch.

In one embodiment, the second one-way clutch includes one selected from the group consisting of a roller-type one-way clutch and a strut-type one-way clutch.

In an embodiment, the harmonic drive system of the electric moped is disposed in a five-way pipe of the frame.

In an embodiment, the first input rotation axis and the second input rotation axis do not coincide.

In an embodiment, the harmonic drive system of the electric power-assisted vehicle further includes a housing, the housing is provided for accommodating the transmission gear device, and the rigid wheel system is fixed on the housing.

In one embodiment, the casing is an figure eight.

In an embodiment, the electric motor includes one selected from the group consisting of a brushless DC motor and a brushed DC motor.

In one embodiment, the harmonic drive system of the electric moped further includes a battery, wherein the battery is electrically connected to the transmission motor device.

In an embodiment, the battery is a rechargeable battery.

In an embodiment, the battery is disposed in a middle tube or an inclined tube of the frame.

In an embodiment, the wave generator, the flex wheel and the rigid wheel form a harmonic reducer, and the harmonic reducer has a harmonic reducer rotating shaft system that coincides with the first input rotating shaft; wherein the motor output shaft One of the motor output rotation shafts coincides with the first input rotation shaft.

In an embodiment, the transmission gear device further includes a retaining ring for the shaft, which is used to fix the connection between the elliptical cam and the output shaft of the motor.

In an embodiment, the wave generator, the flexible wheel and the rigid wheel form a harmonic reducer. The harmonic reducer has a reduction ratio, and the reduction ratio is greater than or equal to 20 and less than or equal to 50.

In an embodiment, wherein the external gear of the flexible wheel has a number of teeth of the external teeth of the flexible wheel, one of the meshing teeth of the external gear of the flexible wheel and the internal gear of the rigid wheel is greater than or equal to 15% of the external teeth of the flexible wheel, and is less than or equal to 30% of the external teeth of the flexible wheel.

In one embodiment, the flexspline outer gear has a flexspear gear module, the inner ring of the flexible bearing has a diameter of the inner ring of the flexible bearing, and the elliptical cam has a long axis and a short axis; wherein the long axis is greater than or equal to Flexible bearing inner ring diameter plus 1.8 times the flex wheel gear modulus, and less than or equal to the flexible bearing inner ring diameter plus 2.4 times the flex wheel gear module; where the short shaft system is greater than or equal to the flexible bearing inner ring diameter minus The modulus of the flexible gear is 2.4 times, and is less than or equal to the diameter of the inner ring of the flexible bearing minus 1.8 times the modulus of the flexible gear.

In an embodiment, the flexible wheel is cup-shaped, the first end of the flexible wheel is a cup-shaped mouth, and the second end of the flexible wheel is a cup-shaped bottom.

In an embodiment, the transmission gear device further includes a third one-way clutch. The third one-way clutch is housed in the inner ring of the elliptical cam, and the third one-way clutch has an inner ring for supplying power to the motor The shafts are connected.

In an embodiment, the transmission gear device further includes a third one-way clutch, the elliptical cam has an inner ring, and the third one-way clutch is accommodated in the inner ring of the elliptical cam.

In an embodiment, the third one-way clutch is a one-way roller bearing.

In an embodiment, the transmission gear device further includes a torque sensor. The torque sensor is accommodated in the inner ring of the first one-way clutch. The torque sensor has an inner ring for accommodating the center axle of the electric moped.

In an embodiment, the wave generator, the flex wheel and the rigid wheel form a harmonic reducer, and the harmonic reducer has one of the harmonic reducer rotating shafts coincides with the first input rotating shaft.

In one embodiment, the end of the harmonic drive system of the electric moped near the wave generator is set in a middle tube or an inclined tube of the frame; the end of the harmonic drive system of the electric moped away from the wave generator is set at One of the five frames in the frame.

In one embodiment, the angle between one of the first input rotation axis and the second input rotation axis is 90 degrees.

In an embodiment, the harmonic drive system of the electric power-assisted vehicle further includes a housing, the housing is provided for accommodating the transmission gear device, and the rigid wheel system is fixed on the housing.

In order to further understand the creation, the following is a preferred embodiment, in conjunction with the drawings and figure numbers, the specific composition content of the creation and the achieved effects are described in detail as follows.

1‧‧‧Electric moped harmonic drive system

10‧‧‧ Transmission gear device

11‧‧‧Housing

12‧‧‧ Close to one end of the wave generator

13‧‧‧ Far away from one end of the wave generator

2‧‧‧wave generator

20‧‧‧Elliptical cam

21‧‧‧Inner ring of elliptical cam

200‧‧‧Elliptical cam outer ring

22‧‧‧Flange

23‧‧‧End cap

24‧‧‧gasket

25‧‧‧flexible bearing

26‧‧‧Inner ring of flexible bearing

27‧‧‧Flexible bearing outer ring

28‧‧‧bearing

29‧‧‧Brass sleeve

3‧‧‧ flexible wheel

31‧‧‧The first end of the soft wheel

32‧‧‧Inner ring at the first end of the flexible wheel

33‧‧‧Fixed part of flexible wheel

34‧‧‧Flexible wheel external gear

35‧‧‧The second end of the flexible wheel

36‧‧‧Sealing element

4‧‧‧ Ganglun

40‧‧‧Rear wheel internal gear

45‧‧‧Harmonic reducer

46‧‧‧Harmonic reducer rotating shaft

5‧‧‧Steering gear set

50‧‧‧The first gear

500‧‧‧Fixed part of the first gear

51‧‧‧First input section

510‧‧‧The first input rotation axis

52‧‧‧First gear

520‧‧‧Inner ring of the first gear

53‧‧‧First connecting shaft

530‧‧‧The first end of the first connecting shaft

531‧‧‧The second end of the first connecting shaft

55‧‧‧Second gear

56‧‧‧Second input section

560‧‧‧Inner ring of the second input part

561‧‧‧Second input rotation axis

57‧‧‧ Output

58‧‧‧Second gear

59‧‧‧Second connecting shaft

590‧‧‧The first end of the second connecting shaft

591‧‧‧The second end of the second connecting shaft

6‧‧‧ Parallel shaft gear set

60‧‧‧The first gear

600‧‧‧Fixed part of the first gear

61‧‧‧First input section

610‧‧‧The first input rotation axis

62‧‧‧First gear

620‧‧‧Inner ring of the first gear

63‧‧‧The first connecting shaft

630‧‧‧The first end of the first connecting shaft

631‧‧‧The second end of the first connecting shaft

64‧‧‧Connecting shaft protrusion

65‧‧‧Second gear

66‧‧‧Second input section

660‧‧‧Inner ring of the second input part

661‧‧‧The second input rotation axis

67‧‧‧ Output

68‧‧‧Second gear

69‧‧‧Second connecting shaft

690‧‧‧The first end of the second connecting shaft

691‧‧‧The second end of the second connecting shaft

7‧‧‧First one-way clutch

71‧‧‧First bearing

710‧‧‧Inner ring of the first bearing

711‧‧‧Inner ring of the first bearing

712‧‧‧The first bearing outer ring

72‧‧‧Second bearing

73‧‧‧third bearing

74‧‧‧Retaining ring for hole

75、75’‧‧‧Second one-way clutch

750, 750’‧‧‧ inner ring of the second one-way clutch

76‧‧‧The third one-way clutch

760‧‧‧Inner ring of the third one-way clutch

77‧‧‧Torque Sensor

78‧‧‧Fourth bearing

780‧‧‧Inner ring of the fourth bearing

79‧‧‧Shaft retaining ring

80‧‧‧frame

81‧‧‧Chain

82‧‧‧Central axis

83‧‧‧ Five-way tube

84‧‧‧ middle tube

85‧‧‧ Inclined tube

86‧‧‧ Transmission motor device

87‧‧‧Electric motor

88‧‧‧Motor output shaft

880‧‧‧Motor output shaft

89‧‧‧Battery

9‧‧‧ planetary gear transmission

91‧‧‧ Central axis

92‧‧‧Electric motor

93‧‧‧Hollow connecting shaft

94‧‧‧ Hollow wheel

95‧‧‧Planetary gear

96‧‧‧Center wheel

97‧‧‧Chain

98‧‧‧braking device

99‧‧‧Planet gear carrier

Figure 1 is a schematic cross-sectional view of a specific embodiment of a harmonic drive system for an electric moped.

FIG. 2 is a partially enlarged schematic cross-sectional view of area a of the embodiment of FIG. 1.

FIG. 3 is an exploded perspective view of the elliptical cam, flexible bearing, flexible wheel, and rigid wheel in the embodiment of FIG. 1.

FIG. 4 is a schematic plan view of the combination of an elliptical cam, a flexible bearing, a flexible wheel, and a rigid wheel according to the embodiment of FIG. 3.

FIG. 5 is an exploded perspective view of the flexible wheel, the first gear member, and the second gear member of the embodiment of FIG. 1.

FIG. 6 is a schematic cross-sectional view of one specific embodiment of creating a harmonic driving system of an electric power-assisted vehicle on a frame of an electric power-assisted vehicle.

FIG. 7 is a schematic cross-sectional view of another specific embodiment of creating a harmonic drive system for an electric moped on the frame of the electric moped.

Figure 8 is a schematic diagram of the process of creating five scenario modes for a harmonic drive system of an electric moped.

Figure 9 is a schematic cross-sectional view of another specific embodiment of a harmonic drive system for an electric moped.

FIG. 10 is an exploded perspective view of the flexible wheel, the first gear member, and the second gear member of the specific embodiment of FIG. 9.

FIG. 11 is a schematic cross-sectional view of one specific embodiment of creating a harmonic driving system of an electric power-assisted vehicle on a frame of an electric power-assisted vehicle.

FIG. 12 is a schematic cross-sectional view of another specific embodiment of creating a harmonic drive system for an electric moped on the frame of the electric moped.

FIG. 13 is a schematic cross-sectional view of one embodiment of a planetary gear transmission device of an electric power-assisted vehicle of conventional technology.

FIG. 14 is a partially enlarged schematic cross-sectional view of an embodiment of the conventional technology shown in FIG.

Please refer to FIG. 1, which is a schematic cross-sectional view of a specific embodiment of a harmonic drive system for an electric moped. The harmonic drive system 1 of an electric power-assisted vehicle of the present invention includes a transmission gear device 10, a housing 11 and a transmission motor device 86. The harmonic drive system 1 of the electric moped created in this creation is set in the frame 80 of one of the electric mopeds (please also refer to Figure 6 or (Figure 7). The housing 11 is used to accommodate the transmission gear device 10. The transmission motor device 86 includes an electric motor 87. The electric motor 87 includes one selected from the group consisting of a brushless DC motor and a brushed DC motor. The electric motor 87 has a motor output shaft 88. The motor output shaft 88 has a motor output rotation shaft 880. Please also refer to FIG. 2, which is a partially enlarged schematic cross-sectional view of the area a of the embodiment of FIG. 1. The transmission gear device 10 includes a wave generator 2, a flexible wheel 3, a rigid wheel 4, a steering gear set 5, a first one-way clutch 7, a second one-way clutch 75, a third one-way clutch 76 , Two first bearings 71, two second bearings 72, a torque sensor 77, a retaining ring 74 for a hole, and a retaining ring 79 for a shaft. The wave generator 2 includes an elliptical cam 20 and a flexible bearing 25. Please also refer to FIG. 3, which is an exploded perspective view of the elliptical cam, flexible bearing, flexible wheel, and rigid wheel of the embodiment of FIG. The flexible bearing 25 has an inner ring 26 for accommodating the elliptical cam 20. When the elliptical cam 20 is accommodated in the inner ring 26 of the flexible bearing 25 (that is, the outer ring 200 of the elliptical cam 20 is inserted into the inner ring 26 of the flexible bearing 25), the flexible bearing 25 is deformed into an ellipse. This causes the elliptical cam 20 and the flexible bearing 25 to form the wave generator 2. The flexible wheel 3 has a first end 31 and a second end 35. The flexible wheel 3 is a cup shape, the first end 31 of the flexible wheel 3 is a cup-shaped mouth, and the second end 35 of the flexible wheel 3 is a cup-shaped bottom. The first end 31 of the flexible wheel 3 has a flexible wheel external gear 34 and an inner ring 32. When the wave generator 2 is accommodated in the inner ring 32 of the flexible wheel 3 (that is, the outer ring 27 of the flexible bearing 25 is inserted into the inner ring 32 of the flexible wheel 3), the first end 31 of the flexible wheel 3 The shape becomes elliptical. The rigid wheel 4 has a rigid wheel internal gear 40 for meshing with the flexible wheel external gear 34. The rigid wheel 4 is fixed on the housing 11. Please also refer to FIG. 4, which is a schematic plan view of the combination of the elliptical cam, the flexible bearing, the flexible wheel, and the rigid wheel in the embodiment of FIG. 3. The wave generator 2 (elliptical cam 20 and flexible bearing 25), flexible wheel 3 and rigid wheel 4 form a harmonic reducer 45. The elliptical cam 20 has an inner ring 21. The third one-way clutch 76 is accommodated in the inner ring 21 of the elliptical cam 20. The third one-way clutch 76 has an inner ring 760, which is For connection with the motor output shaft 88. The shaft retaining ring 79 is used to fix the connection between the motor output shaft 88 and the elliptical cam 20 and the third one-way clutch 76 to avoid axial displacement. A gasket 24 can be added when using the retaining ring 79 for the shaft. The harmonic reducer 45 has a harmonic reducer rotating shaft 46, which coincides with the motor output rotating shaft 880. Please also refer to FIG. 5, which is an exploded perspective view of the flexible wheel, the first gear member, and the second gear member of the embodiment of FIG. 1. The steering gear set 5 includes a first gear member 50 and a second gear member 55. The first gear member 50 includes a first gear 52 and a first connecting shaft 53. The second gear member 55 includes a second gear 58 and a second connecting shaft 59. The steering gear set 5 has a first input portion 51, a second input portion 56, and an output portion 57. The first input portion 51 of the steering gear set 5 is located at a first end 530 of the first connecting shaft 53. The first gear 52 is connected to the second end 531 of the first connecting shaft 53. The first gear 52 has an inner ring 520. In this embodiment, the two fourth bearings 78 each have an inner ring 780, and the second one-way clutch 75 has an inner ring 750. First, the second end 531 of the first connecting shaft 53 is accommodated in the two The inner ring 780 of the four-bearing 78 and the inner ring 750 of the second one-way clutch 75 are accommodated in the inner ring 520 of the first gear 52. The first input portion 51 (the first end 530 of the first connecting shaft 53) of the steering gear set 5 is connected to the second end 35 of the flexible wheel 3. The second input portion 56 of the steering gear set 5 is located at a first end 590 of the second connecting shaft 59. The second input portion 56 of the steering gear set 5 has an inner ring 560. The first one-way clutch 7 is accommodated in the inner ring 560 of the second input portion 56 of the steering gear set 5. The second gear 58 is connected to the first end 590 of the second connecting shaft 59. The first gear 52 of the first gear member 50 meshes with the second gear 58 of the second gear member 55. The output portion 57 of the steering gear set 5 is located at a second end 591 of a second connecting shaft 59. The output portion 57 (the second end 591 of the second connecting shaft 59) of the steering gear set 5 is connected to a chain plate 81 of an electric power-assisted vehicle. The first one-way clutch 7 has an inner ring, and the torque sensor 77 is accommodated in the inner ring of the first one-way clutch 7. The torque sensor 77 has an inner The circle is for accommodating one of the central axle 82 of the electric moped. Among them, a bearing 28 and a copper sleeve 29 can be added, so that the inner shaft 82 simultaneously has an inner ring of the torque sensor 77, an inner ring of the bearing 28, and an inner ring of the copper sleeve 29, which makes the rotation of the middle shaft 82 more Stable and avoid axial displacement. The first input portion 51 of the steering gear set 5 (the first end 530 of the first connecting shaft 53) has a first input rotating shaft 510. The second input portion 56 of the steering gear set 5 (the first end 590 of the second connecting shaft 59) has a second input rotation shaft 561. The first input rotation shaft 510 coincides with the harmonic reduction gear rotation shaft 46 and also the motor output rotation shaft 880. The angle between one of the first input rotation axis 510 and the second input rotation axis 561 is 90 degrees (not parallel). The flexible wheel 3 further includes a fixing portion 33. The first gear member 50 further includes a fixing portion 500 (located on the first connecting shaft 53). The two first bearings 71 have an inner ring 710, an inner ring 711, and an outer ring 712, respectively. Before the first input portion 51 of the steering gear set 5 (the first end 530 of the first connecting shaft 53) is connected to the second end 35 of the flexible wheel 3, the first input between the steering gear set 5 can be The first connecting shaft 53 between the portion 51 (the first end 530 of the first connecting shaft 53) and the fixed portion 500 is accommodated in the inner ring 710 of the two first bearings 71, and then the first of the steering gear set 5 The input portion 51 (the first end 530 of the first connecting shaft 53) is connected to the second end 35 of the flex spline 3, whereby the inner ring 711 of the first bearing 71 can be fixed to the fixing portion 33 of the flex spline 3 and Between the fixed parts 500 of the first gear member 50 to avoid the axial displacement of the first bearing 71. A gasket 24 may be added to the connection between the first input portion 51 of the steering gear set 5 (the first end 530 of the first connecting shaft 53) and the second end 35 of the flexible wheel 3. The retaining ring 74 for holes is used to fix the outer ring 712 of the first bearing 71 to the housing 11 to avoid axial displacement of the first bearing 71. The first bearing 71 includes at least one selected from the group consisting of a ball bearing and a needle bearing. The ball bearing system can be a deep groove ball bearing. The two second bearings 72 each have an inner ring, and the second connecting shaft 59 of the second gear member 55 is accommodated in the inner ring of the two second bearings 72. The second bearing 72 includes at least one selected from the group consisting of a ball bearing and a needle bearing. Of which ball bearings The system can be a deep groove ball bearing. It may further include a sealing element 36 to seal the gap between the middle shaft 82 and the output portion 57 of the steering gear set 5 (the second end 591 of the second connecting shaft 59).

Please refer to FIG. 6, which is a schematic cross-sectional view of one specific embodiment of creating a harmonic drive system for an electric moped on a frame of an electric moped. In this embodiment, the harmonic drive system 1 of the electric moped further includes a battery 89, wherein the battery 89 is electrically connected to the transmission motor device 86. The battery 89 can be a rechargeable battery. The harmonic drive system 1 of the electric moped near the end of the wave generator 2 is set in the inclined tube 85 of the frame 80; the end 13 of the harmonic drive system 1 of the electric moped away from the wave generator 2 is set on the frame 80 A five-way tube 83; wherein the battery 89 is disposed in the inclined tube 85 of the frame 80. In some other embodiments, the harmonic drive system 1 of the electric moped near the end 12 of the wave generator 2 is disposed in the inclined tube 85 of the frame 80; the harmonic drive system 1 of the electric moped is far from the end 13 of the wave generator 2 It is disposed in the five-way tube 83 of the frame 80; and the battery 89 is disposed in a middle tube 84 of one of the frames 80 (not shown in the figure).

Please refer to FIG. 7, which is a schematic cross-sectional view of another specific embodiment of creating a harmonic drive system for an electric moped on the frame of the electric moped. In this embodiment, the harmonic drive system 1 of the electric moped further includes a battery 89, wherein the battery 89 is electrically connected to the transmission motor device 86. The battery 89 can be a rechargeable battery. The harmonic drive system 1 of the electric moped near the end of the wave generator 2 is arranged in the middle tube 84 of the frame 80; the harmonic drive system 1 of the electric moped 1 is away from the wave generator 2 and the end 13 is arranged on the frame 80 of the fifth Inside the tube 83; wherein the battery 89 is disposed in the tube 84 in the frame 80. In some other embodiments, the harmonic drive system 1 of the electric moped is located near the end 12 of the wave generator 2 in the tube 84 of the frame 80; the harmonic drive system 1 of the electric moped is away from the end 13 of the wave generator 2 It is arranged in the five-way tube 83 of the frame 80; wherein the battery 89 is arranged in the inclined tube 85 of the frame 80 (not shown in the figure).

The harmonic drive system 1 of the electric moped used in this creation adopts the steering and deceleration structure of the steering gear set 5 (including two bevel gears: the first gear member 50 and the second gear member 55), together with the deceleration structure of the harmonic reducer 45, It can greatly reduce the volume and weight of the harmonic drive system 1 of the electric moped, and the harmonic drive system 1 of the electric moped can be installed in the tube 84 and the five-way tube 83 of the frame 80 of the electric moped or in the electric moped Inside the inclined tube 85 and the five-way tube 83 of the frame 80. Such a design can effectively reduce the volume of the harmonic drive system 1 of the entire electric moped at the five-way tube 83, thereby enhancing the design and other components of the electric moped, such as the shaft 82, the torque sensor 77, and the first one-way clutch 7 Configuration flexibility. Compared with the conventional technology, the harmonic drive system of the electric moped is externally attached to the frame. This structure adopts this structure to hide the entire harmonic drive system 1 of the electric moped in the frame 80 of the electric moped, which can improve the aesthetic design of the appearance. In addition, the harmonic reducer 45 has the characteristics of high reduction ratio, high meshing rate, small size, light weight, low noise and high transmission accuracy, which can effectively improve the battery endurance and high transmission accuracy of the electric drive vehicle harmonic transmission system 1 The operation is smooth and can improve the comfort when riding.

When riding or using an electric moped with the harmonic drive system 1 of the electric moped created in this book, users generally have the following five scenarios. Please refer to Figure 8, which is a schematic diagram of the process of creating five scenario modes for a harmonic drive system of an electric moped. Line 1, line two, line three, line four and line five in Figure 8 respectively represent situation mode 1, situation mode two, situation mode three, situation mode four and situation mode five, where the arrow direction of the line represents driving rotation Of direction. For example, the line between the central axis 82 and the torque sensor 77 represents that the central axis 82 drives the torque sensor 77. Scenario mode 1: The system is in a normal riding state. When the user depresses the pedal to rotate in the forward direction, the middle shaft 82 of the electric moped starts to rotate forward. At this time, the torque sensor 77 senses a rotating torque value, and the electric motor 87 starts according to the magnitude of the rotating torque value. Turn (The output torque of the electric motor 87 is related to the rotation torque value), and through the harmonic reducer 45, the first gear member 50 and the second gear member 55, the output portion 57 of the steering gear set 5 (second connecting shaft 59) is added The second end 591) of the torque output from the chain 81 of the electric moped helps reduce the burden on the user. (The user presses the pedal to rotate forward, driving the center shaft 82, driving the torque sensor 77, driving the first one-way clutch 7, driving the second gear member 55, and driving the chain plate 81; the electric motor 87 rotates, driving the third one To the clutch 76, the wave generator 2, the flexible wheel 3, the first connecting shaft 53, the second one-way clutch 75, the first gear 52, the second gear member 55, and the sprocket 81.) Mode 2: When the user wants to rotate the foot pedal in the reverse direction (reverse rotation of the central shaft 82), the first one-way clutch 7 functions at this time, so that the torque sensor 77 is connected to the first end 590 of the second connecting shaft 59 Disengagement (even if the middle shaft 82 is detached from the first end 590 of the second connecting shaft 59), and the torque value sensed by the torque sensor 77 at this time is zero (due to no load), so the electric motor 87 stops rotating. (The user depresses the pedal to rotate in the reverse direction, driving the center shaft 82, driving the torque sensor 77, and the first one-way clutch 7 disengages the torque sensor 77 from the second gear member 55.) Scenario Mode 3: When the battery 89 is empty The electric motor 87 does not rotate, or when the user does not want to use the electric motor 87 for assistance, the switch is turned off so that the electric motor 87 does not rotate. At this time, if there is no second one-way clutch 75, when the user steps on the pedal, the forward rotation of the central shaft 82 will not only bring the rotation of the second gear member 55 but also cause the chain disc 81 to rotate forward, the second gear member 55 will also rotate the first gear member 50 and the harmonic reducer 45 together. However, since the harmonic speed reducer 45 has a relatively large reduction ratio, the user may feel strenuous when stepping on the foot pedal. Therefore, in Scenario Mode 3, the second one-way clutch 75 of the harmonic drive system 1 of the original electric bicycle can function to disengage the first gear 52 from the second end 531 of the first connecting shaft 53, thereby The load caused by the interlocking harmonic speed reducer 45 when the user steps on the pedal is greatly reduced. (The user presses the foot pedal to rotate forward, driving the central shaft 82, driving the torque sensor 77, driving the first one-way clutch 7, driving the second The gear member 55 simultaneously drives the sprocket 81 and the first gear 52, and the second one-way clutch 75 disengages the first gear 52 from the first connecting shaft 53. ) Scenario Mode 4: During emergency braking, the user stops stepping on the foot pedal, but the electric motor 87 cannot immediately stop rotating at that moment, so before the electric motor 87 completely stops, it will still drive the harmonic reducer 45, the first A gear member 50 and a second gear member 55 in turn drive the central shaft 82. Although this period of time is very short, it may cause discomfort for the user. At this time, the first one-way clutch 7 of the harmonic drive system 1 of the electric power bicycle of the present invention can function to disengage the torque sensor 77 from the first end 590 of the second connecting shaft 59 (even if the middle shaft 82 and the second The first end 590 of the connecting shaft 59 is disengaged) to avoid discomfort for the user. (The electric motor 87 rotates, drives the third one-way clutch 76, drives the wave generator 2, drives the flexible wheel 3, drives the first connecting shaft 53, drives the second one-way clutch 75, drives the first gear 52, drives the second gear 55, driving the chain disc 81, while the first one-way clutch 7 disengages the second gear member 55 from the torque sensor 77.) Scenario Mode 5: The user sometimes needs to reverse the vehicle by pulling the car to reverse the chain disc 81 At this time, the torque value sensed by the torque sensor 77 is zero (because there is no load), so the electric motor 87 will not rotate. However, the reverse rotation of the chain plate 81 will cause the reverse rotation of the second gear member 55, which not only drives the reverse rotation of the central shaft 82, but also drives the first gear member 50 and the harmonic reducer 45 to rotate together. However, since the electric motor 87 cannot be reversed, the third one-way clutch 76 functions at this time to disengage the motor output shaft 88 from the elliptical cam 20, thereby reversing the way of pulling the vehicle without jamming. (The chain plate 81 rotates in the reverse direction, driving the second gear member 55, and simultaneously driving the first one-way clutch 7 and the first gear 52; the first one-way clutch 7 drives the torque sensor 77, drives the central shaft 82, and drives the foot pedal; A gear 52 drives the second one-way clutch 75, drives the first connecting shaft 53, drives the flexible wheel 3, drives the wave generator 2, and the third one-way clutch 76 disengages the wave generator 2 from the electric motor 87.)

In some preferred embodiments, the second gear 58 has a second number of teeth and The first gear 52 has a ratio of a first number of teeth greater than or equal to 1 and less than or equal to 2.

In some preferred embodiments, the combination of the first gear 52 and the second gear 58 includes one selected from the group consisting of: a combination of two bevel gears, a combination of two halberd gears, an external gear, and a side gear Combination, a worm gear and a cylindrical worm, and a worm gear and a drum worm.

The flexible external gear 34 has a flexible external tooth number. In some preferred embodiments, one of the meshing teeth of the flexible external gear 34 and the rigid internal gear 40 is greater than or equal to 15% of the flexible external teeth and less than or equal to 30% of the flexible external teeth.

In some preferred embodiments, the harmonic reducer 45 has a reduction ratio, and the reduction ratio is greater than or equal to 20 and less than or equal to 50.

In some preferred embodiments, the flexible external gear 34 has a flexible gear module. The inner ring 26 of the flexible bearing 25 has a flexible bearing inner ring diameter. The elliptical cam 20 has a long axis and a short axis, and the long axis is larger than the short axis. Among them, the long shaft system is greater than or equal to the diameter of the flexible bearing inner ring plus 1.8 times the flex wheel gear module, and less than or equal to the diameter of the flexible bearing inner ring plus 2.4 times the flex wheel gear module; where the short shaft system is greater than or equal to The diameter of the flexible bearing inner ring minus 2.4 times the modulus of the flexible gear, and less than or equal to the diameter of the flexible bearing inner ring minus 1.8 times the modulus of the flexible gear.

In some preferred embodiments, a flange 22 may be used to connect the transmission gear device 10 and the transmission motor device 86.

Please refer to FIG. 9, which is a schematic cross-sectional view of another specific embodiment of a harmonic drive system for an electric moped. The harmonic drive system 1 of an electric power-assisted vehicle of the present invention includes a transmission gear device 10, a housing 11 and a transmission motor device 86. The harmonic drive system 1 of the electric moped created in this creation is set in the frame 80 of one of the electric mopeds (please also refer to page 11 (Figure or Figure 12). The housing 11 is used to accommodate the transmission gear device 10. The transmission motor device 86 includes an electric motor 87. The electric motor 87 includes one selected from the group consisting of a brushless DC motor and a brushed DC motor. The electric motor 87 has a motor output shaft 88. The motor output shaft 88 has a motor output rotation shaft 880. The transmission gear device 10 includes a wave generator 2, a flexible wheel 3, a rigid wheel 4, a parallel shaft gear set 6, a first one-way clutch 7, a second one-way clutch 75', a third one-way A clutch 76, a first bearing 71, two second bearings 72, a third bearing 73, a torque sensor 77, and a shaft retaining ring 79. The wave generator 2 includes an elliptical cam 20 and a flexible bearing 25. Please refer to Figure 3 and Figure 4 at the same time. The flexible bearing 25 has an inner ring 26 for accommodating the elliptical cam 20. When the elliptical cam 20 is accommodated in the inner ring 26 of the flexible bearing 25 (the outer ring 200 of the elliptical cam 20 is inserted into the inner ring 26 of the flexible bearing 25), the flexible bearing 25 is deformed into an ellipse, thereby The wave generator 2 is formed. The flexible wheel 3 has a first end 31 and a second end 35. The flexible wheel 3 is a cup shape, the first end 31 of the flexible wheel 3 is a cup-shaped mouth, and the second end 35 of the flexible wheel 3 is a cup-shaped bottom. The first end 31 of the flexible wheel 3 has a flexible wheel external gear 34 and an inner ring 32. When the wave generator 2 is accommodated in the inner ring 32 of the flexible wheel 3 (the outer ring 27 of the flexible bearing 25 is inserted into the inner ring 32 of the flexible wheel 3), the first end 31 of the flexible wheel 3 is deformed It is oval. The rigid wheel 4 has a rigid wheel internal gear 40 for meshing with the flexible wheel external gear 34. The rigid wheel 4 is fixed on the housing 11. The housing 11 is a figure eight. The wave generator 2, the flexible wheel 3 and the rigid wheel 4 form a harmonic reducer 45. The elliptical cam 20 has an inner ring 21. The third one-way clutch 76 is accommodated in the inner ring 21 of the elliptical cam 20. The third one-way clutch 76 has an inner ring 760 for connecting with the motor output shaft 88. The shaft retaining ring 79 is used to fix the connection between the motor output shaft 88 and the elliptical cam 20 and the third one-way clutch 76 to avoid axial displacement. A gasket 24 can be added when using the retaining ring 79 for the shaft. The harmonic reducer 45 has a harmonic reducer rotating shaft 46, which coincides with the motor output rotating shaft 880. Please also refer to Figure 10, which is specific to Figure 9 An exploded perspective view of the flexible wheel, the first gear member and the second gear member of the embodiment. The parallel shaft gear set 6 includes a first gear member 60 and a second gear member 65. The first gear member 60 includes a first gear 62 and a first connecting shaft 63. The second gear member 65 includes a second gear 68 and a second connecting shaft 69. The parallel shaft gear set 6 has a first input portion 61, a second input portion 66, and an output portion 67. The first input portion 61 of the parallel shaft gear set 6 is located at a first end 630 of the first connecting shaft 63. The first gear 62 is connected to a second end 631 of one of the first connecting shafts 63. The first gear 62 has an inner ring 620. In this embodiment, the second one-way clutch 75' has an inner ring 750'. The second end 631 of the first connecting shaft 63 further includes a connecting shaft protrusion 64. The third bearing 73 has an inner ring. First, the second end 631 of the first connecting shaft 63 is accommodated in the inner ring 750' of the second one-way clutch 75'. The second one-way clutch 75' is then accommodated in the inner ring 620 of the first gear 62. Then, the connecting shaft protrusion 64 is accommodated in the inner ring of the third bearing 73. The second one-way clutch 75' includes one selected from the group consisting of a roller type one-way clutch and a strut type one-way clutch. The third bearing 73 includes at least one selected from the group consisting of a ball bearing and a needle bearing. The first input portion 61 (the first end 630 of the first connecting shaft 63) of the parallel shaft gear set 6 is connected to the second end 35 of the flexible wheel 3. The second input portion 66 of the parallel shaft gear set 6 is located at a first end 690 of the second connecting shaft 69. The second input portion 66 of the parallel shaft gear set 6 has an inner ring 660. The first one-way clutch 7 is accommodated in the inner ring 660 of the second input portion 66 of the parallel shaft gear set 6. The second gear 68 is connected to the first end 690 of the second connecting shaft 69. The first gear 62 of the first gear member 60 meshes with the second gear 68 of the second gear member 65. The output portion 67 of the parallel shaft gear set 6 is located at a second end 691 of a second connecting shaft 69. The output portion 67 (the second end 691 of the second connecting shaft 69) of the parallel shaft gear set 6 is connected to a chain plate 81 of an electric power-assisted vehicle. The first one-way clutch 7 has an inner ring, and the torque sensor 77 is accommodated in the inner ring of the first one-way clutch 7. The torque sensor 77 has an inner ring for accommodating one of the central axles of the electric moped 82. Among them, a bearing 28 and a copper sleeve 29 can be added, so that the inner shaft 82 simultaneously has an inner ring of the torque sensor 77, an inner ring of the bearing 28, and an inner ring of the copper sleeve 29, which makes the rotation of the middle shaft 82 more Stable and avoid axial displacement. The first input portion 61 (the first end 630 of the first connecting shaft 63) of the parallel shaft gear set 6 has a first input rotating shaft 610. The second input portion 66 (the first end 690 of the second connecting shaft 69) of the parallel shaft gear set 6 has a second input rotating shaft 661. The first input rotation shaft 610 coincides with the harmonic reduction gear rotation shaft 46 and also the motor output rotation shaft 880. The first input rotation axis 610 is parallel to the second input rotation axis 661, and the first input rotation axis 610 and the second input rotation axis 661 do not coincide. The flexible wheel 3 further includes a fixing portion 33. The first gear member 60 further includes a fixing portion 600 (located on the first connecting shaft 63). The first bearing 71 has an inner ring and an inner ring. Before the first input portion 61 (the first end 630 of the first connecting shaft 63) of the parallel shaft gear set 6 is connected to the second end 35 of the flexible wheel 3, the first A first connecting shaft 63 between an input portion 61 (the first end 630 of the first connecting shaft 63) and the fixing portion 600 is accommodated in the inner ring of the first bearing 71, and then the first of the parallel shaft gear set 6 The input portion 61 (the first end 630 of the first connecting shaft 63) is connected to the second end 35 of the flexible wheel 3, whereby the inner ring of the first bearing 71 can be fixed to the fixed portion 33 of the flexible wheel 3 and the first Between the fixed parts 600 of a gear member 60, the first bearing 71 prevents axial displacement. The first bearing 71 includes at least one selected from the group consisting of a ball bearing and a needle bearing. The ball bearing system can be a deep groove ball bearing. The two second bearings 72 each have an inner ring, and the second connecting shaft 69 of the second gear member 65 is accommodated in the inner ring of the two second bearings 72. The second bearing 72 includes at least one selected from the group consisting of a ball bearing and a needle bearing. The ball bearing system can be a deep groove ball bearing. It may further include a sealing element 36 to seal the gap between the middle shaft 82 and the output portion 67 of the parallel shaft gear set 6 (the second end 691 of the second connecting shaft 69).

Please refer to Figure 11, which is a harmonic drive system for electric bicycles A schematic cross-sectional view of a specific embodiment of a frame provided on an electric moped. In this embodiment, the harmonic drive system 1 of the electric moped further includes a battery 89, wherein the battery 89 is electrically connected to the transmission motor device 86. The battery 89 can be a rechargeable battery. The harmonic drive system 1 of the electric moped is arranged in the five-way tube 83 of the frame 80; wherein the battery 89 is arranged in the middle tube 84 of the frame 80.

Please refer to FIG. 12, which is a schematic cross-sectional view of one specific embodiment of creating a harmonic drive system for an electric power-assisted vehicle on a frame of the electric power-assisted vehicle. In this embodiment, the harmonic drive system 1 of the electric moped further includes a battery 89, wherein the battery 89 is electrically connected to the transmission motor device 86. The battery 89 can be a rechargeable battery. The harmonic drive system 1 of the electric moped is arranged in the five-way tube 83 of the frame 80; the battery 89 is arranged in the inclined tube 85 of the frame 80.

The harmonic drive system 1 of the electric moped used in this creation adopts the deceleration structure of the parallel shaft gear set 6 (including two external gears: the first gear member 60 and the second gear member 65), and the deceleration structure of the harmonic reducer 45 is The volume and weight of the harmonic drive system 1 of the electric moped can be greatly reduced, and the harmonic drive system 1 of the electric moped can be installed in the five-way tube 83 of the frame 80 of the electric moped. Compared with the conventional technology, the harmonic drive system of the electric moped is externally attached to the frame. This structure adopts this structure to hide the entire harmonic drive system 1 of the electric moped in the frame 80 of the electric moped, which can improve the aesthetic design of the appearance. In addition, the harmonic reducer 45 has the characteristics of high reduction ratio, high meshing rate, small size, light weight, low noise and high transmission accuracy, which can effectively improve the battery endurance and high transmission accuracy of the electric drive vehicle harmonic transmission system 1 The operation is smooth and can improve the comfort when riding.

When riding or using an electric moped with the harmonic drive system 1 of the electric moped created in this book, users generally have the following five scenarios. Please refer to figure 8. Scenario mode 1: The system is in a normal riding state. When the user depresses the foot pedal to rotate it forward, the electric moped The middle shaft 82 starts to rotate in the forward direction, at this time the torque sensor 77 senses a rotating torque value, and the electric motor 87 starts to rotate according to the value of the rotating torque value (the output torque of the electric motor 87 is related to the rotating torque value), And through the harmonic reducer 45, the first gear member 60 and the second gear member 65, the output portion 67 (the second end 691 of the second connecting shaft 69) of the parallel shaft gear set 6 is added to the chain disc 81 of the electric moped Torque output to reduce the user's burden. (The user presses the pedal to rotate forward, driving the center shaft 82, driving the torque sensor 77, driving the first one-way clutch 7, driving the second gear member 65, and driving the chain plate 81; the electric motor 87 rotates, driving the third one The direction clutch 76 drives the wave generator 2, drives the flexible wheel 3, drives the first connecting shaft 63, drives the second one-way clutch 75', drives the first gear 62, drives the second gear member 65, and drives the chain plate 81.) Scenario Mode 2: When the user wants to reverse the foot pedal (reverse rotation of the central shaft 82), the first one-way clutch 7 is now in effect, causing the torque sensor 77 to connect the first end of the second shaft 69 690 disengages (even if the middle shaft 82 disengages from the first end 690 of the second connecting shaft 69), and the torque value sensed by the torque sensor 77 at this time is zero (due to no load), so the electric motor 87 stops rotating. (The user steps on the pedal to rotate in the reverse direction, driving the central shaft 82, driving the torque sensor 77, and the first one-way clutch 7 disengages the torque sensor 77 from the second gear member 65.) Situation Mode 3: When the battery 89 is empty The electric motor 87 does not rotate, or when the user does not want to use the electric motor 87 for assistance, the switch is turned off so that the electric motor 87 does not rotate. At this time, if there is no second one-way clutch 75', when the user steps on the pedal, the positive rotation of the central shaft 82 will not only bring the rotation of the second gear member 65 but also cause the chain plate 81 to rotate forward, the second gear The member 65 will also rotate the first gear member 60 and the harmonic reducer 45 together. However, since the harmonic speed reducer 45 has a relatively large reduction ratio, the user may feel strenuous when stepping on the foot pedal. Therefore, in Scenario Mode 3, the second one-way clutch 75' of the harmonic drive system 1 of the original electric bicycle can function to disengage the first gear 62 from the second end 631 of the first connecting shaft 63. This greatly reduces the user’s stepping The load caused by the harmonic reducer 45. (The user presses the pedal to rotate forward, driving the central shaft 82, driving the torque sensor 77, driving the first one-way clutch 7, driving the second gear member 65, and simultaneously driving the chain plate 81 and driving the first gear 62, the second The one-way clutch 75' disengages the first gear 62 from the first connecting shaft 63.) Scenario Mode 4: When emergency braking, the user stops stepping on the foot pedal, but the electric motor 87 cannot immediately stop rotating at that moment, Therefore, before the electric motor 87 completely stops, it will still drive the harmonic reducer 45, the first gear member 60 and the second gear member 65, and then drive the central shaft 82. Although this period of time is very short, it may cause Feeling discomfort. At this time, the first one-way clutch 7 of the harmonic drive system 1 of the electric power bicycle of the present invention can function to disengage the torque sensor 77 from the first end 690 of the second connecting shaft 69 (even if the middle shaft 82 and the second The first end 690 of the connecting shaft 69 is disengaged) to avoid discomfort for the user. (The electric motor 87 rotates, drives the third one-way clutch 76, drives the wave generator 2, drives the flexible wheel 3, drives the first connecting shaft 63, drives the second one-way clutch 75', drives the first gear 62, drives the second The gear member 65 drives the sprocket 81, and at the same time, the first one-way clutch 7 disengages the second gear member 65 from the torque sensor 77.) Scenario Mode 5: The user sometimes needs to reverse the vehicle by pulling the car to make the sprocket 81 In the reverse rotation, the torque value sensed by the torque sensor 77 at this time is zero (because there is no load), so the electric motor 87 will not rotate. However, the reverse rotation of the sprocket 81 will cause the reverse rotation of the second gear member 65, which not only drives the reverse rotation of the central shaft 82, but also drives the first gear member 60 and the harmonic reducer 45 to rotate together. However, since the electric motor 87 cannot be reversed, the third one-way clutch 76 functions at this time to disengage the motor output shaft 88 from the elliptical cam 20, thereby reversing the way of pulling the vehicle without jamming. (The chain disc 81 rotates in the reverse direction, driving the second gear member 65, and simultaneously driving the first one-way clutch 7 and the first gear 62; the first one-way clutch 7 drives the torque sensor 77, drives the central shaft 82, and drives the foot pedal; A gear 62 drives the second one-way clutch 75', drives the first connecting shaft 63, drives the flexible wheel 3, drives the wave generator 2, and the third The one-way clutch 76 disengages the wave generator 2 from the electric motor 87. )

In some preferred embodiments, the third one-way clutch 76 is a one-way roller bearing.

In some preferred embodiments, the ratio of a second number of teeth of the second gear 68 to a first number of teeth of the first gear 62 is greater than or equal to 1 and less than or equal to 2.

In some preferred embodiments, the combination of the first gear 62 and the second gear 68 includes one selected from the group consisting of: a combination of two external gears, a combination of two helical gears, and an external gear and a Combination of internal gears.

The flexible external gear 34 has a flexible external tooth number. In some preferred embodiments, one of the meshing teeth of the flexible external gear 34 and the rigid internal gear 40 is greater than or equal to 15% of the flexible external teeth and less than or equal to 30% of the flexible external teeth.

In some preferred embodiments, the harmonic reducer 45 has a reduction ratio, and the reduction ratio is greater than or equal to 20 and less than or equal to 50.

In some preferred embodiments, the flexible external gear 34 has a flexible gear module. The inner ring 26 of the flexible bearing 25 has a flexible bearing inner ring diameter. The elliptical cam 20 has a long axis and a short axis, and the long axis is larger than the short axis. Among them, the long shaft system is greater than or equal to the diameter of the flexible bearing inner ring plus 1.8 times the flex wheel gear module, and less than or equal to the diameter of the flexible bearing inner ring plus 2.4 times the flex wheel gear module; where the short shaft system is greater than or equal to The diameter of the flexible bearing inner ring minus 2.4 times the modulus of the flexible gear, and less than or equal to the diameter of the flexible bearing inner ring minus 1.8 times the modulus of the flexible gear.

The above are the specific embodiments of the creation and the technical methods used. Based on the disclosure or teaching of this article, many changes and corrections can be derived and deduced, which can still be regarded as equivalent changes made for the concept of the creation. The effect has not exceeded the actual covered by the specification and drawings The qualitative spirit should be regarded as within the technical scope of this creation, and should be clarified first.

In summary, according to the content disclosed above, this creation can indeed achieve the intended purpose of the creation, provide a harmonic drive system for electric mopeds, very valuable in the industry, and file a patent application for creation.

1‧‧‧Electric moped harmonic drive system

10‧‧‧ Transmission gear device

11‧‧‧Housing

12‧‧‧ Close to one end of the wave generator

13‧‧‧ Far away from one end of the wave generator

2‧‧‧wave generator

20‧‧‧Elliptical cam

22‧‧‧Flange

23‧‧‧End cap

24‧‧‧gasket

25‧‧‧flexible bearing

28‧‧‧bearing

29‧‧‧Brass sleeve

3‧‧‧ flexible wheel

33‧‧‧Fixed part of flexible wheel

36‧‧‧Sealing element

4‧‧‧ Ganglun

5‧‧‧Steering gear set

50‧‧‧The first gear

500‧‧‧Fixed part of the first gear

55‧‧‧Second gear

56‧‧‧Second input section

560‧‧‧Inner ring of the second input part

561‧‧‧Second input rotation axis

57‧‧‧ Output

58‧‧‧Second gear

59‧‧‧Second connecting shaft

590‧‧‧The first end of the second connecting shaft

591‧‧‧The second end of the second connecting shaft

7‧‧‧First one-way clutch

71‧‧‧First bearing

712‧‧‧The first bearing outer ring

72‧‧‧Second bearing

74‧‧‧Retaining ring for hole

76‧‧‧The third one-way clutch

77‧‧‧Torque Sensor

79‧‧‧Shaft retaining ring

81‧‧‧Chain

82‧‧‧Central axis

86‧‧‧ Transmission motor device

87‧‧‧Electric motor

88‧‧‧Motor output shaft

880‧‧‧Motor output shaft

Claims (45)

A harmonic drive system for an electric moped is provided in a frame of an electric moped. The harmonic drive system of the electric moped includes: A transmission gear device, including: A wave generator, including: An elliptical cam; and A flexible bearing with an inner ring for accommodating the elliptical cam to make the flexible bearing deform into an elliptical shape; A flexible wheel having a first end and a second end, the first end of the flexible wheel has a flexible wheel external gear and an inner ring, the inner ring of the first end of the flexible wheel is for accommodating Setting the wave generator to change the shape of the first end of the flexible wheel into an ellipse; A rigid wheel with an internal gear of the rigid wheel for meshing with the external gear of the flexible wheel; A steering gear set having a first input part, a second input part and an output part, the first input part is connected to the second end of the flexible wheel, the second input part has an inner ring , The output part is for connecting with a sprocket of the electric moped, the first input rotation axis of the first input part is not parallel to the second input rotation axis of the second input part; as well as A first one-way clutch is accommodated in the inner ring of the second input portion of the steering gear set. The first one-way clutch has an inner ring for accommodating a central axle of the electric power-assisted vehicle. The harmonic drive system of an electric power-assisted vehicle as described in item 1 of the patent application scope, wherein the steering gear set includes: A first gear piece, including: A first gear; and A first connecting shaft, the first input portion of the steering gear set is located at a first end of the first connecting shaft, and the first gear system is connected to a second end of the first connecting shaft; A second gear member, including: A second gear; and A second connecting shaft, the second input portion of the steering gear set is located at a first end of the second connecting shaft, the second gear system is connected to the first end of the second connecting shaft, the steering The output part of the gear set is located at a second end of the second connecting shaft; The first gear of the first gear member meshes with the second gear of the second gear member. A harmonic drive system for an electric moped is provided in a frame of an electric moped. The harmonic drive system of the electric moped includes: A transmission motor device, including: An electric motor having a motor output shaft; and A transmission gear device, including: A wave generator, including: An elliptical cam with an inner ring connected to the output shaft of the motor; and A flexible bearing with an inner ring for accommodating the elliptical cam to make the flexible bearing deform into an elliptical shape; A flexible wheel having a first end and a second end, the first end of the flexible wheel has a flexible wheel external gear and an inner ring, the inner ring of the first end of the flexible wheel is for accommodating Setting the wave generator to change the shape of the first end of the flexible wheel into an ellipse; A rigid wheel with an internal gear of the rigid wheel for meshing with the external gear of the flexible wheel; A steering gear set having a first input part, a second input part and an output part, the first input part is connected to the second end of the flexible wheel, the second input part has an inner ring , The output part is for connecting with a sprocket of the electric moped, the first input rotation axis of the first input part is not parallel to the second input rotation axis of the second input part; A first one-way clutch is accommodated in the inner ring of the second input portion of the steering gear set. The first one-way clutch has an inner ring for accommodating a central axle of the electric power-assisted vehicle. The harmonic drive system of an electric power-assisted vehicle as described in item 3 of the patent application scope, wherein the steering gear set includes: A first gear piece, including: A first gear; and A first connecting shaft, the first input portion of the steering gear set is located at a first end of the first connecting shaft, and the first gear system is connected to a second end of the first connecting shaft; A second gear member, including: A second gear; and A second connecting shaft, the second input portion of the steering gear set is located at a first end of the second connecting shaft, the second gear system is connected to the first end of the second connecting shaft, the steering The output part of the gear set is located at a second end of the second connecting shaft; The first gear of the first gear member meshes with the second gear of the second gear member. Harmonic drive system for electric power-assisted vehicles as described in any of the second and fourth items of the patent application System, wherein the combination of the first gear and the second gear includes one selected from the group consisting of: a combination of two bevel gears, a combination of two halberd gears, a combination of an external gear and a side gear, and a worm gear And a combination of a cylindrical worm, and a combination of a worm wheel and a drum-shaped worm. A harmonic drive system for an electric moped is provided in a frame of an electric moped. The harmonic drive system of the electric moped includes: A transmission gear device, including: A wave generator, including: An elliptical cam; and A flexible bearing with an inner ring for accommodating the elliptical cam to make the flexible bearing deform into an elliptical shape; A flexible wheel having a first end and a second end, the first end of the flexible wheel has a flexible wheel external gear and an inner ring, the inner ring of the first end of the flexible wheel is for accommodating Setting the wave generator to change the shape of the first end of the flexible wheel into an ellipse; A rigid wheel with an internal gear of the rigid wheel for meshing with the external gear of the flexible wheel; A parallel shaft gear set has a first input part, a second input part and an output part, the first input part is connected to the second end of the flexible wheel, the second input part has an internal Circle, the output part is for connecting with a chain disc of the electric power-assisted vehicle, a first input rotation axis of the first input part is parallel to a second input rotation axis of the second input part; A first one-way clutch is accommodated in the inner ring of the second input portion of the parallel shaft gear set. The first one-way clutch has an inner ring for accommodating a central shaft of the electric power-assisted vehicle. The harmonic drive system of an electric power-assisted vehicle as described in item 6 of the patent application scope, wherein the parallel shaft gear set includes: A first gear piece, including: A first gear; and A first connecting shaft, the first input portion of the parallel shaft gear set is located at a first end of the first connecting shaft, and the first gear system is connected to a second end of the first connecting shaft; A second gear member, including: A second gear; and A second connecting shaft, the second input portion of the parallel shaft gear set is located at a first end of the second connecting shaft, the second gear system is connected to the first end of the second connecting shaft, the The output portion of the parallel shaft gear set is located at a second end of the second connecting shaft; The first gear of the first gear member meshes with the second gear of the second gear member. A harmonic drive system for an electric moped is provided in a frame of an electric moped. The harmonic drive system of the electric moped includes: A transmission motor device, including: An electric motor having a motor output shaft; and A transmission gear device, including: A wave generator, including: An elliptical cam with an inner ring connected to the output shaft of the motor; and A flexible bearing with an inner ring for accommodating the elliptical cam to make the flexible bearing deform into an elliptical shape; A flexible wheel has a first end and a second end, the first end of the flexible wheel has a An external gear of the flexible wheel and an inner ring, the inner ring of the first end of the flexible wheel is provided for accommodating the wave generator, so that the shape of the first end of the flexible wheel becomes elliptical; A rigid wheel with an internal gear of the rigid wheel for meshing with the external gear of the flexible wheel; A parallel shaft gear set has a first input part, a second input part and an output part, the first input part is connected to the second end of the flexible wheel, the second input part has an internal Circle, the output part is for connecting with a chain disc of the electric power-assisted vehicle, a first input rotation axis of the first input part is parallel to a second input rotation axis of the second input part; A first one-way clutch is accommodated in the inner ring of the second input portion of the parallel shaft gear set. The first one-way clutch has an inner ring for accommodating a central shaft of the electric power-assisted vehicle. The harmonic drive system of the electric moped as described in item 8 of the patent application scope, wherein the parallel shaft gear set includes: A first gear piece, including: A first gear; and A first connecting shaft, the first input portion of the parallel shaft gear set is located at a first end of the first connecting shaft, and the first gear system is connected to a second end of the first connecting shaft; A second gear member, including: A second gear; and A second connecting shaft, the second input portion of the parallel shaft gear set is located at a first end of the second connecting shaft, the second gear system is connected to the first end of the second connecting shaft, the The output portion of the parallel shaft gear set is located at a second end of the second connecting shaft; The first gear of the first gear member meshes with the second gear of the second gear member. The harmonic drive system for an electric power-assisted vehicle as described in any of items 7 and 9 of the patent application scope, wherein the combination of the first gear and the second gear includes one selected from the group: two The combination of external gears, the combination of two helical gears, and the combination of an external gear and an internal gear. The harmonic drive system of an electric power-assisted vehicle as described in any of items 7 and 9 of the patent application scope, wherein the transmission gear device further includes at least a third bearing, and the second end of the first connecting shaft further includes A connecting shaft protrusion, the at least one third bearing has an inner ring for accommodating the connecting shaft protrusion. The harmonic drive system for an electric moped according to item 11 of the patent application scope, wherein the at least one third bearing includes at least one selected from the group consisting of a ball bearing and a needle bearing. The electric power-assisted vehicle harmonic drive system as described in any one of the second, fourth, seventh and ninth items of the patent application scope, wherein the second gear has a second number of teeth and the first gear The ratio of one of the first teeth is greater than or equal to 1, and less than or equal to 2. The harmonic drive system for an electric power-assisted vehicle as described in any one of the second, fourth, seventh, and ninth items of the patent application scope, wherein the transmission gear device further includes at least one first bearing, the at least one first A bearing has an inner ring for accommodating the first connecting shaft of the first gear member. The harmonic drive system for an electric moped according to item 14 of the patent application scope, wherein the at least one first bearing includes at least one selected from the group consisting of a ball bearing and a needle bearing. The harmonic drive system for an electric power-assisted vehicle as described in item 14 of the patent scope, wherein the transmission gear device further includes a retaining ring for the hole, the at least one first bearing has an outer ring, and the retaining ring for the hole is used for fixing The outer ring of the at least one first bearing. The harmonic drive system for an electric power-assisted vehicle as described in item 14 of the patent scope, wherein the flexible wheel further includes a fixed portion, the first gear member further includes a fixed portion, and the at least one first bearing has an inner ring, the The fixing portion of the flexible wheel and the fixing portion of the first gear member are used to fix the inner ring of the at least one first bearing. The harmonic drive system for an electric power-assisted vehicle as described in any one of the second, fourth, seventh, and ninth items of the patent application scope, wherein the transmission gear device further includes at least one second bearing, the at least one second The two bearings have an inner ring for accommodating the second connecting shaft of the second gear member. The harmonic drive system for an electric moped according to item 18 of the patent application scope, wherein the at least one second bearing includes at least one selected from the group consisting of a ball bearing and a needle bearing. The harmonic drive system of an electric power-assisted vehicle as described in any one of the 12th, 15th and 19th items of the patent application scope, wherein the ball bearing is a deep groove ball bearing. The harmonic drive system for an electric power-assisted vehicle as described in any one of the second, fourth, seventh and ninth items of the patent application scope, wherein the first gear member further includes a second one-way clutch, the first The two one-way clutches have an inner ring for accommodating the second end of the first connecting shaft, and the first gear has an inner ring for accommodating the second one-way clutch. The harmonic drive system for an electric moped as described in item 21 of the patent application range, wherein the second one-way clutch includes one selected from the group consisting of: a roller-type one-way clutch and a strut-type one-way clutch . The harmonic drive system of an electric power-assisted vehicle as described in any one of the 6th and 8th items of the patent application scope, wherein the harmonic drive system of the electric-assisted vehicle is arranged in a five-way pipe of the frame. The harmonic drive system for an electric power-assisted vehicle as described in any of items 6 and 8 of the patent application scope, wherein the first input rotation shaft system and the second input rotation shaft do not coincide. The harmonic drive system for an electric power-assisted vehicle as described in any one of the 6th and 8th items of the patent application scope further includes a housing for accommodating the transmission gear device, and the rigid wheel system is fixed to the On the shell. The harmonic drive system of the electric power-assisted vehicle as described in item 25 of the patent application scope, wherein the casing is a figure eight. The harmonic drive system of an electric power-assisted vehicle as described in any one of items 3 and 8 of the patent scope, wherein the electric motor includes one selected from the group consisting of a brushless DC motor and a brushed DC motor. The harmonic drive system of an electric power-assisted vehicle as described in any one of the third and eighth patent applications further includes a battery, wherein the battery is electrically connected to the transmission motor device. The harmonic drive system for an electric moped as described in item 28 of the patent application scope, wherein the battery is a rechargeable battery. The harmonic drive system of an electric power-assisted vehicle as described in item 28 of the patent application scope, wherein the battery is disposed in a middle tube or an inclined tube of the frame. The harmonic drive system for an electric power-assisted vehicle as described in any one of the third and eighth patent applications, wherein the wave generator, the flexible wheel and the rigid wheel form a harmonic reducer, and the harmonic reducer A rotating shaft system of a harmonic reducer coincides with the first input rotating shaft; wherein a motor output rotating shaft system of the motor output shaft coincides with the first input rotating shaft. The harmonic drive system for an electric power-assisted vehicle as described in any one of the third and eighth patent applications, wherein the transmission gear device further includes a third one-way clutch, and the third one-way clutch is accommodated in the In the inner ring of the elliptical cam, the third one-way clutch has an inner ring for connection with the output shaft of the motor. The harmonic drive system of an electric power-assisted vehicle as described in Item 32 of the patent scope, wherein the third one-way clutch is a one-way roller bearing. The harmonic drive system for an electric power-assisted vehicle as described in any one of the third and eighth patent applications, wherein the transmission gear device further includes a retaining ring for the shaft, which is used to fix the elliptical cam and The connection of the output shaft of the motor. The harmonic drive system of an electric power-assisted vehicle as described in any of the first, third, sixth and eighth items of the patent application scope, wherein the wave generator, the flexible wheel and the rigid wheel form a harmonic A speed reducer, the harmonic speed reducer has a reduction ratio, the reduction ratio is greater than or equal to 20, and less than or equal to 50. The harmonic drive system of an electric power-assisted vehicle as described in any one of the first, third, sixth and eighth items of the patent application scope, wherein the flexible external gear has a flexible external gear tooth number, the flexible wheel One of the meshing teeth of the external gear meshing with the internal gear of the rigid wheel is greater than or equal to 15% of the external teeth of the flexible wheel, and less than or equal to 30% of the external teeth of the flexible wheel. The harmonic drive system of an electric power-assisted vehicle as described in any one of the first, third, sixth and eighth items of the patent application scope, wherein the flexible external gear has a flexible gear module and the flexible bearing The inner ring has a flexible bearing inner ring diameter, the elliptical cam has a long axis and a short axis; wherein the long axis is greater than or equal to the flexible bearing inner ring diameter plus 1.8 times the flexible gear module, And less than or equal to the diameter of the inner ring of the flexible bearing plus 2.4 times the modulus of the flexible gear; wherein the short shaft system is greater than or equal to the diameter of the inner ring of the flexible bearing minus 2.4 times the modulus of the flexible gear, and is less than Or equal to the flexible bearing gear diameter minus 1.8 times the flexible gear module. The harmonic drive system of an electric power-assisted vehicle as described in any one of the first, third, sixth and eighth items of the patent application scope, wherein the flexible wheel is cup-shaped, and the first end of the flexible wheel It is a cup opening of the cup shape, and the second end of the flexible wheel is a cup bottom of the cup shape. The harmonic drive system for an electric power-assisted vehicle as described in any one of the first and sixth patent applications, wherein the transmission gear device further includes a third one-way clutch, the elliptical cam has an inner ring, and the third The one-way clutch is accommodated in the inner ring of the elliptical cam. The harmonic drive system for an electric moped as described in item 39 of the patent application range, wherein the third one-way clutch is a one-way roller bearing. The harmonic drive system of an electric power-assisted vehicle as described in any one of the first, third, sixth and eighth items of the patent application scope, wherein the transmission gear device further includes a torque sensor, which is a torque sensor system Accommodated in the inner ring of the first one-way clutch, the torque sensor has an inner ring for accommodating the central axle of the electric power-assisted vehicle. The harmonic drive system of an electric power-assisted vehicle as described in any one of the first and sixth patent applications, wherein the wave generator, the flexible wheel and the rigid wheel form a harmonic reducer, and the harmonic reducer The rotating shaft system of one harmonic reducer coincides with the first input rotating shaft. The harmonic drive system of an electric power-assisted vehicle as described in any one of the first and third items of the patent application scope, wherein the harmonic drive system of the electric-assisted vehicle is disposed near one end of the wave generator and is disposed in a middle tube of the frame Inside or in an inclined tube; one end of the harmonic drive system of the electric moped away from the wave generator is arranged in a five-way tube of the frame. The harmonic drive system for an electric power-assisted vehicle as described in any one of the first and third patent application scopes, wherein the angle between one of the first input rotation axis and the second input rotation axis is 90 degrees. The harmonic drive system for an electric power-assisted vehicle as described in any one of the first and third patent application scopes further includes a housing for housing the transmission gear device, and the rigid wheel system is fixed to the On the shell.

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