TWI694952B - Harmonic gear transmission mechanism of electric auxiliary power of electric bicycle - Google Patents

Abstract

The invention relates to a harmonic gear transmission mechanism of electric auxiliary power of an electric bicycle, which comprises a housing, a motor, a rigid wheel, a bearing seat, an output disc, a flexible wheel, a hollow shaft and a cam ring. The stator of the outer ring of the motor is fixed in the middle section of the housing chamber. The inner circumferential ring of the tube section of the front section of the rigid wheel is provided with clamping teeth, and the disc surface of the rear section is fixed on the front section of the chamber. The bearing housing accommodates the front section of the accommodation chamber, and the first bearing is interposed between the outer periphery and the bearing housing. The front disc surface of the flexible wheel is clamped by the output disc and the bearing seat, the rear tube portion of the flexible wheel extends into the front tube portion, and the outer ring of the rear tube portion of the flexible wheel is provided with matching latch teeth that mesh with the latch teeth. The middle section of the hollow shaft runs through the inner ring rotor of the motor. The inner circumference of the cam ring is sleeved on the front section of the hollow shaft, and a flexible bearing is interposed between the outer circumference of the cam ring and the inner section of the tube section behind the flexible wheel, so that the harmonic gear transmission technology can be applied to the power transmission mechanism of the bicycle to achieve harmonics The effect of power transmission deceleration.

Description

Harmonic gear transmission mechanism of electric auxiliary power of electric bicycle

The invention relates to a harmonic gear transmission mechanism of electric auxiliary power of an electric bicycle, in particular to an electric bicycle auxiliary power transmission technology which can achieve the effect of reducing the harmonic power transmission and deceleration of the electric bicycle.

According to the press, bicycles are not only general means of transportation, they have even developed into indispensable compound sports and leisure tools in recreation and sports competitions. In particular, electric assisted bicycles equipped with electric motors can effectively reduce the physical burden of riders, so electric assisted bicycles have been favored and loved by consumers. Generally speaking, the motor transmission mechanism of the electric auxiliary bicycle is installed in the front and rear wheel hubs of the bicycle or connects with the output shaft of the bicycle and is connected with the large gear plate to provide auxiliary power for driving the front or rear wheels to rotate.

According to what is known, representative patents for bicycles with auxiliary power transmission functions are shown in the new patent No. M484555 "Bike Booster Motors with One-way Function". The patent includes a rotatable housing, a motor mechanism provided in the housing, and a gear set that is transmitted between the housing and the output shaft of the motor mechanism, whereby the power of the motor mechanism is sequentially transmitted from the output shaft and gear to the housing . Although the patent has the output function of subsidizing power; however, the mechanism of this patent is not a harmonic gear transmission mechanism, so it cannot produce the transmission effect of harmonic power, so that there will be poor power reduction effect, large size and heavy weight The lack of heavy and poor transmission stability, resulting in Does not meet the lightweight trend in the bicycle field.

In addition, the general harmonic gear transmission mechanism is mainly a mechanical power transmission mechanism composed of three components such as a wave generator (that is, a cam ring), a flexible gear (such as a flexible wheel), and a rigid gear (such as a rigid wheel). This mechanical power transmission mechanism is under the action of the wave generator of the cam ring, so that the flexible wheel is elastically deformed and interacts with the rigid wheel to achieve the purpose of transmitting motion or power. In the transmission, the wave generator makes one revolution, and the number of cyclic deformations at a certain point on the flexible wheel is called the wave number. As for the deformation process of the flexible wheel, it is a basically symmetrical harmonic, so it is called a harmonic drive.

In addition, the conventional cycloid gear reducers have the defects of large volume, heavy weight and poor transmission stability. In addition, there are many defects in the design of the existing electric bicycle power transmission mechanism, which results in many defects such as large volume, large noise and small transmission output ratio. Therefore, how to develop a bicycle power transmission technology that combines harmonic gear technology to improve the transmission stability of the bicycle has become a technical issue that the industry in the related technical fields desperately wants to improve and challenge.

Therefore, in view of the above-mentioned conventional technology and the lack of the patent, the inventor has made continuous efforts to develop a set of inventions that are different from the above-mentioned conventional technology and have improved efficacy.

The main purpose of the present invention is to provide a harmonic gear transmission mechanism for electric auxiliary power of an electric bicycle, which mainly applies the harmonic gear transmission technology to the power transmission mechanism of the bicycle, so that the flexible wheel can realize harmonic power under the fixed limitation of the rigid wheel The effect of transmission deceleration, so it has small size, light weight, large transmission ratio range, high transmission precision, high transmission efficiency and transmission Features such as better dynamic stability. The technical means to achieve the main purpose of the invention include the housing, motor, rigid wheel, bearing housing, output disk, flexible wheel, hollow shaft and cam ring. The stator of the outer ring of the motor is fixed in the middle section of the housing chamber. The inner circumferential ring of the tube section of the front section of the rigid wheel is provided with clamping teeth, and the disc surface of the rear section is fixed on the front section of the chamber. The bearing housing accommodates the front section of the accommodation chamber, and the first bearing is interposed between the outer periphery and the bearing housing. The front disc surface of the flexible wheel is clamped by the output disc and the bearing seat, the rear tube portion of the flexible wheel extends into the front tube portion, and the outer ring of the rear tube portion of the flexible wheel is provided with matching latch teeth that mesh with the latch teeth. The middle section of the hollow shaft runs through the inner ring rotor of the motor. The inner circumference of the cam ring is sleeved on the front section of the hollow shaft, and a flexible bearing is interposed between the outer circumference of the cam ring and the inner circumference of the tube section of the rear section of the flexible wheel.

10‧‧‧Housing

11‧‧‧Room

110‧‧‧ Ring Department

20‧‧‧Motor

21‧‧‧Inner ring rotor

22‧‧‧Outer ring stator

30‧‧‧gang

31‧‧‧Front tube department

32‧‧‧ Rear plate

33‧‧‧jaw

40‧‧‧Bearing

41‧‧‧ First bearing

42‧‧‧Flexible bearing

43‧‧‧Second bearing

44‧‧‧third bearing

45‧‧‧Fourth bearing

46‧‧‧bolt

47‧‧‧key

50‧‧‧Output plate

51‧‧‧Side cover

52‧‧‧End cap

60‧‧‧Flex wheel

61‧‧‧front plate

62‧‧‧ Rear management department

63‧‧‧With clamping teeth

70‧‧‧Hollow shaft

80‧‧‧Cam ring

90‧‧‧rotating oil seal

91‧‧‧Inner C buckle

FIG. 1 is an exploded schematic diagram of the specific architecture of the present invention.

FIG. 2 is a combined schematic diagram of a specific architecture of the present invention.

FIG. 3 is a schematic view of another perspective of the specific architecture of the present invention.

FIG. 4 is a schematic cross-sectional view of a specific structure of the present invention.

FIG. 5 is a partial cross-sectional schematic diagram of a specific architecture of the present invention.

In order for your review committee to further understand the overall technical features of the present invention and the technical means to achieve the purpose of the invention, specific examples and drawings are used to explain in detail:

Please refer to Figures 1 to 5 for an embodiment of the main purpose of the invention. It is installed on the electric bicycle (such as installed in the front and rear hubs of the bicycle or connected to the output shaft of the bicycle to form a linkage with the large gear disc ; But not limited to this), used to drive the wheels of electric bicycles to provide the auxiliary power required by electric bicycles. The electric auxiliary power transmission mechanism includes a shell The technical features of the body 10, a motor 20, a rigid wheel 30, a bearing housing 40, an output disc 50, a flexible wheel 60, a hollow shaft 70 and a cam ring 80. A housing 11 is provided inside the housing 10. The motor 20 includes an inner ring rotor 21 and an outer ring stator 22 surrounding the inner ring rotor 21. The outer ring stator 22 is fixed near the middle position on the side of the chamber 11. The rigid wheel 30 includes a front-stage tube portion 31 and a rear-stage disk surface 32. The inner circumference of the front-stage tube portion 31 is provided with a plurality of teeth 33, and the rear-stage disk surface 32 is fixed to the front stage of the chamber 11. The bearing housing 40 accommodates the front section of the accommodation chamber 11, and a first bearing 41 (such as a needle roller bearing; but not limited to this) is interposed between the outer periphery of the rigid wheel 30 and the inner periphery of the bearing housing 40. The flexible wheel 60 includes a front disk surface 61 and a rear tube portion 62. The front disk surface 61 is clamped and positioned by the output disk 50 and the bearing housing 40. The rear tube portion 62 extends into the inner periphery of the front tube portion 31 of the rigid wheel 30. The outer ring of the rear tube portion 62 of the wheel 60 is provided with a plurality of matching teeth 63 meshing with the teeth 33. The middle section of the hollow shaft 70 penetrates the inner ring rotor 21 of the motor 20 and can be coaxially located in the chamber 11 and can be driven to rotate by the motor 20. The inner circumference of the cam ring 80 is sleeved on the front section of the hollow shaft 70. A flexible bearing 42 is interposed between the outer circumference of the cam ring 80 and the inner circumference of the tube section 62 of the rear section of the flexspline 60. The output disc 50 is fixed on the front disc surface 6 of the flexible wheel 60. When the present invention is in operation, the motor 20 is used to drive the hollow shaft 70 to rotate, and the cam ring 80 and the flexible bearing 42 on the hollow shaft 70 are rotated to continuously deform the flexible wheel 60 and drive the output disk under the restriction of the rigid wheel 30 50 rotation, by the power transmission of the output disk 50, to achieve the deceleration effect of harmonic power transmission.

Referring to the embodiment shown in FIG. 4, a ring portion 110 protrudes inward from the front section of the chamber 11. A second bearing 43 is interposed between the ring portion 110 and the hollow shaft 70, and the rigid wheel 30 is fixed through the locking bolt 46. A side wall of the ring portion 110.

Please refer to FIG. 1 and FIG. 4. The inner circumference of the cam ring 80 and the outer circumference of the hollow shaft 70 are fitted with a key 47 to form a linkage.

Please refer to the embodiment shown in FIGS. 1 and 5, the output disk 50 is fixed on the front disk surface 61 of the flexible wheel 60 through the locking bolt 46.

Please refer to FIG. 1, FIG. 4 and FIG. 5, the present invention further includes an end cover 52 And one side cover 51. The end cover 52 is fixed to the rear section of the chamber 11 through the locking bolt 46. A third bearing 44 is interposed between the end cover 52 and the hollow shaft 70. A fourth bearing 45 is interposed between the output disk 50 and the hollow shaft 70.

Please refer to FIG. 1 and FIG. 5. The side cover 51 passes through the locking bolt 46 and is fixed in the ring groove of the inner periphery of the output tray 50.

In order to facilitate the clarification of the purpose and function of the important components of this case, the main features of the present invention are described as follows:

a. The housing 10 is used to install the body of each part of the reducer, and the motor end measuring cover and the rigid wheel 30 are locked to fix the internal parts.

b. The flexible wheel 60 is deformed by the rotation of the cam ring 80 and the flexible bearing 42 and rotates under the limit of the rigid wheel 30, and drives the output disk 50 and the side cover 51 provided on the output disk 50 to rotate.

c. The rigid wheel 30 is locked with the housing 10 to restrict the flexible wheel 60 from rotating due to deformation.

d. The output disc 50 and the flexible wheel 60 are locked and interlocked, and the output disc 50 can be driven to rotate due to the rotation of the flexible wheel 60.

e. The side cover 51 is locked with the output disk 50 to restrict the movement of the flexible bearing 42.

f. The cam ring 80 is used to deform the flexible bearing 42 to deform together with the flexible wheel 60.

g. The bearing base 40 and the flexible wheel 60 are locked and linked with the output disc 50, and the needle roller bearing makes the rotation smoother.

h. The protection of the end cover 52 and the housing 10 for locking to prevent the motor 20 from coming out.

i. The arrangement of the needle bearing and the needle bearing housing 40 can make the rotation smoother.

j. The motor 20 is used to drive the hollow shaft 70 to rotate.

k. The flexible bearing 42 makes the flexible wheel 60 smoother when rotating.

l. The hollow shaft 70 is rotated by the drive of the motor 20, and drives the cam ring 80 to rotate in cooperation with itself.

Specifically, the present invention is mainly used as a speed reducer, and the cam ring 80 and the flexible bearing 42 are used as the initiative, the rigid wheel 30 is fixed, and the flexible wheel 60 is the power output mechanism. form. As for the cam ring 80 and the flexible bearing 42, they are the components that cause the controllable elastic deformation of the flexible wheel 60. When the cam ring 80 and the flexible bearing 42 are installed in the flexible wheel 60, the cross section of the flexible wheel 60 can be forced to change from the original circle to an ellipse, and the clamping teeth 63 and the clamping teeth of the rigid wheel 30 near the two ends of the long axis 33 is fully engaged, and the matching teeth 63 near the ends of the short shaft are just completely disengaged from the teeth 33 of the rigid wheel 30. When the cam ring 80 and the flexible bearing 42 continuously rotate, the deformation of the flexible wheel 60 continuously changes. The meshing state of the flexspline 60 and the rigid wheel 30 is also continuously changed, by engaging, meshing, disengaging, disengaging, and re-engaging continuously, so that the flexspline 60 is along the cam relative to the rigid wheel 30 The purpose of the slow deceleration rotation of the ring 80 and the flexible bearing 42 (wave generator H) in the opposite direction.

Therefore, through the description of the above specific embodiments, the present invention can indeed apply the harmonic gear transmission technology to the power transmission mechanism of the bicycle, so that the flexible wheel can achieve the effect of decelerating the harmonic power transmission under the fixed limitation of the rigid wheel, so It has the characteristics of small size, light weight, large transmission ratio range, high transmission precision, high transmission efficiency and better transmission stability.

The above is only a feasible embodiment of the present invention and is not intended to limit the patent scope of the present invention. Any equivalent implementation of other changes based on the content, features and spirit described in the following claims should be Included in the patent scope of the present invention. The structural features of the invention specifically defined in the claim are not found in similar items, and are practical and progressive. They have met the requirements of the invention patent. You have filed an application in accordance with the law, and I would like to ask the Jun Bureau to approve the patent in accordance with the law to maintain this. The applicant's legal rights and interests.

10‧‧‧Housing

20‧‧‧Motor

21‧‧‧Inner ring rotor

22‧‧‧Outer ring stator

30‧‧‧gang

31‧‧‧Front tube department

32‧‧‧ Rear plate

33‧‧‧jaw

40‧‧‧Bearing

41‧‧‧ First bearing

42‧‧‧Flexible bearing

43‧‧‧Second bearing

44‧‧‧third bearing

45‧‧‧Fourth bearing

46‧‧‧bolt

47‧‧‧key

50‧‧‧Output plate

51‧‧‧Side cover

52‧‧‧End cap

60‧‧‧Flex wheel

61‧‧‧front plate

62‧‧‧ Rear management department

63‧‧‧With clamping teeth

70‧‧‧Hollow shaft

80‧‧‧Cam ring

90‧‧‧rotating oil seal

91‧‧‧Inner C buckle

Claims (7)

A harmonic gear transmission mechanism for electric auxiliary power of an electric bicycle, which comprises: a housing with a chamber inside; a motor inside the chamber; a rigid wheel including a front pipe section and a rear section The disc surface, the inner circumferential ring of the front tube section is provided with a plurality of matching teeth, the rear disc surface is fixed on a front section of the chamber; a bearing housing which houses the front section of the chamber and the outer circumference of the front section of the rigid wheel A first bearing is interposed between the inner periphery of the bearing housing; a hollow shaft which is penetrated in the motor and can be driven to rotate by the motor; a cam ring whose inner periphery is sleeved on the hollow shaft The front section of a; a flexible wheel, which includes a front plate surface and a rear tube portion, the front plate surface can be clamped by the bearing seat, the rear tube portion extends into the front tube portion of the rigid wheel, the outer periphery of the cam ring and A flexible bearing is interposed between the inner circumferences of the rear tube section, and the outer ring of the rear section tube section of the flexible wheel is provided with a plurality of matching teeth that mesh with the teeth; and an output disc, which is fixed to the flexible wheel The front disk surface; when the motor drives the hollow shaft to rotate, the cam ring and the flexible bearing sleeved on the hollow shaft can be rotated to make the flexible wheel continuously deform and rotate under the restriction of the rigid wheel. Driving the output disc to rotate; wherein, a ring portion protrudes inwardly from the front section of the chamber, and a second bearing is interposed between the ring portion and the hollow shaft, and the rigid wheel is fixed to the ring portion through a locking bolt A side wall. The harmonic gear transmission mechanism of the electric auxiliary power of the electric bicycle according to claim 1, wherein the inner periphery of the cam ring and the outer periphery of the hollow shaft are connected with one key to form a linkage. The harmonic gear transmission mechanism of the electric auxiliary power of the electric bicycle according to claim 1, wherein the output disk is fixed to the front disk surface of the flexible wheel through a locking bolt, and an interposed between the output disk and the hollow shaft The fourth bearing. The harmonic gear transmission mechanism of the electric auxiliary power of the electric bicycle according to claim 1, further comprising an end cover, the end cover is fixed to a rear section of the chamber through a locking bolt, between the end cover and the hollow shaft A third bearing is interposed. The harmonic gear transmission mechanism of electric assist power of an electric bicycle as described in claim 1, wherein the first bearing is a needle roller bearing. The harmonic gear transmission mechanism of the electric auxiliary power of the electric bicycle according to claim 1, further includes a side cover, the side cover is fixed in a ring groove of the inner periphery of the output disk through a locking bolt. The harmonic gear transmission mechanism of the electric auxiliary power of the electric bicycle according to claim 1, wherein the motor includes an inner ring rotor and an outer ring stator fixed around the inner ring rotor and fixed to the middle section of the chamber, the hollow The middle section of the shaft passes through the inner ring rotor, so that the hollow shaft can be coaxially located in the chamber.

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