Large-speed-ratio double-cycloid gear speed reduction inner rotor hub motor assembly

Abstract

The utility model relates to a large-speed-ratio double-cycloid gear reduction inner rotor hub motor assembly, which belongs to the technical field of hub motors and comprises a motor stator, a motor rotor and a double-cycloid gear reduction mechanism which are mounted in a hub motor, and the double-cycloid gear reduction mechanism comprises an outer cycloid gear, a middle cycloid gear and a cycloid output gear. The epicycloid gear is fixedly installed on an epicycloid fixing shell in the hub motor, the outer wall of the cycloid output gear and the inner wall of the epicycloid gear are provided with a fourth epicycloid tooth and a first hypocycloid tooth respectively, the two sides of the output end of the middle cycloid gear are provided with a second epicycloid tooth and a third hypocycloid tooth respectively, the second epicycloid tooth is meshed with the first hypocycloid tooth, and the third epicycloid tooth is meshed with the second hypocycloid tooth. A motor shaft penetrating through the hub motor is arranged at the center of the rotor shaft, the speed reduction mechanism adopts a double-cycloid planetary speed reduction structure mode, the size is small, the weight is light, the transmission ratio and the transmission efficiency are high, the service life is long, the processing performance is good, and the cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of in-wheel motors, and specifically relates to a large reduction ratio double cycloid gear reduction in-rotor in-wheel motor assembly. Background Art

[0002] With the substantial increase in the urbanization rate in China and the continuous influx of urban population, urban traffic congestion has intensified. The increase in the number of automobiles has, on the one hand, caused the overloaded operation of parking lots, and on the other hand, large parking lots occupy a large amount of public space; all of the above problems are promoting the transformation of transportation modes. Therefore, the construction of cities is vigorously promoting public transportation and green travel.

[0003] Currently, domestic shared bicycles and shared electric bicycles are growing based on such a development logic; coupled with the continuous improvement of people's health awareness, there will be more and more choices for green travel modes. The usage requirements for personal green transportation tools such as electric bicycles, electric-assisted bicycles, and electric skateboards will be increasing, and thus higher requirements are put forward for the technical upgrade and experience upgrade of such products.

[0004] Currently, most personal travel tools such as electric bicycles and electric-assisted bicycles adopt the drive scheme of in-wheel motors.

[0005] For the in-wheel motor used in electric-assisted bicycles, in order to pursue the coordination between the appearance and the bicycle, the outer diameter of the in-wheel motor needs to be made as small as the same as the outer diameter of the frisbee. However, due to the limitation of the axial space, the torque output of the motor becomes smaller, and it cannot well adapt to the usage requirements of bicycles in multiple working conditions. Therefore, the in-wheel motors on electric-assisted bicycles mostly adopt the motor scheme of an outer rotor motor plus planetary reduction to increase the torque of the motor.

[0006] This kind of motor structure can achieve the torque increase output of the motor in a relatively small space structure. Due to the limitation of the internal structure, most of the planetary gear train structures adopted by the current in-wheel motors can only achieve a single-stage reduction ratio of 5. And in order to reasonably control the total mass, a plastic gear mechanism is mostly used inside, which to a certain extent affects the service life of the motor and the output of the maximum torque.

[0007] As an in-wheel motor for electric-assisted bicycles, it pursues a small volume, that is, complete bicycleization, and at the same time needs to provide a certain torque output. Therefore, both the motor and the reduction mechanism need to be made very small. To meet the small size requirement of the motor, a reduction mechanism with a large reduction ratio and a small volume is required to match it. Summary of the Utility Model

[0008] 1. Technical Problems to be Solved by the Utility Model

[0009] The purpose of the utility model is to solve the problems raised in the above background.

[0010] 2. Technical solution

[0011] To achieve the above object, the technical solution provided by the present utility model is as follows:

[0012] A large speed ratio double cycloid gear reduction inner rotor hub motor assembly of the present utility model includes a motor stator, a motor rotor and a double cycloid gear reduction mechanism installed in the hub motor. The double cycloid gear reduction mechanism includes an external cycloid gear, an intermediate cycloid gear and a cycloid output gear. The external cycloid gear is fixedly installed on an external cycloid gear fixed shell in the hub motor. The intermediate cycloid gear is installed on a rotor shaft in the hub motor through a bearing. A cycloid output gear is provided in the hub motor. The cycloid output gear is coaxially arranged with the external cycloid gear. External cycloid teeth four and internal cycloid teeth one are respectively provided on the outer wall of the cycloid output gear and the inner wall of the external cycloid gear. External cycloid teeth two and internal cycloid teeth three are respectively provided on both sides of the output end of the intermediate cycloid gear. The external cycloid teeth two are meshed with the internal cycloid teeth one, and the internal cycloid teeth three are meshed with the external cycloid teeth four. A motor shaft penetrating the hub motor is provided at the center of the rotor shaft. The motor stator is installed in the hub motor housing through a stator housing.

[0013] Preferably, the input end of the intermediate cycloid gear is positioned and installed on the rotor shaft through a bearing. The position of the bearing for positioning and installing the rotor shaft is eccentrically arranged with respect to the axis of the rotor shaft. The rotor shaft drives the intermediate cycloid gear to perform planetary rotation relative to the external cycloid gear through the bearing.

[0014] Preferably, the motor stator is connected to the stator housing, the stator housing is fixedly connected to the motor shaft, the motor rotor is fixedly installed on the rotor shaft, and the rotor shaft is installed on the motor shaft through bearings on both sides.

[0015] Preferably, the cycloid output gear is installed on the output gear through a bearing type one-way clutch, and the output gear is installed on the rotor shaft through a bearing.

[0016] Preferably, the output gear is installed on the hub motor housing through bolts. A flywheel installation base is provided between the output gear and the hub motor housing. The bolts pass through the flywheel installation base, and the flywheel installation base is coaxial with the motor shaft.

[0017] Preferably, the hub motor housing includes a left structural shell and a right cover. The left structural shell is installed on the motor shaft through a bearing and is sealed with an oil seal. The right cover is installed on the left structural shell and is connected to the flywheel installation base.

[0018] Preferably, the external cycloid fixed shell is positioned and installed on the right cover through a bearing.

[0019] Preferably, the output gear and the cycloid output gear are connected through a bearing one-way clutch.

[0020] 3. Beneficial effects

[0021] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0022] (1) For the large speed ratio double cycloid gear reduction inner rotor hub motor assembly of the present utility model, the reduction mechanism adopts the structure of double cycloid planetary reduction, with small volume, light weight, high transmission ratio, high transmission efficiency, long service life, good process performance and low cost.

[0023] (2) For the large speed ratio double cycloid gear reduction inner rotor hub motor assembly of the present utility model, an integrated one-way clutch with bearings is integrated inside, which can greatly improve the system stability and compactness. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the large speed ratio double cycloid gear reduction inner rotor hub motor assembly of the present utility model;

[0025] Figure 2 It is a schematic diagram of the internal structure of the large speed ratio double cycloid gear reduction inner rotor hub motor assembly of the present utility model;

[0026] Figure 3 It is a side view of the large speed ratio double cycloid gear reduction inner rotor hub motor assembly of the present utility model;

[0027] Figure 4 It is a sectional view at B of the large speed ratio double cycloid gear reduction inner rotor hub motor assembly of the present utility model;

[0028] Figure 5 It is a schematic diagram of the eccentric installation of the intermediate cycloid gear at C of the large speed ratio double cycloid gear reduction inner rotor hub motor assembly of the present utility model.

[0029] Explanation of the reference numerals in the schematic diagram:

[0030] 100, hub motor; 101, motor stator; 102, motor rotor; 103, stator housing; 110, external cycloid gear; 111, first internal cycloid teeth; 120, intermediate cycloid gear; 121, second external cycloid teeth; 122, third internal cycloid teeth; 130, rotor shaft; 140, cycloid output wheel; 141, fourth external cycloid teeth; 150, motor shaft; 160, one-way clutch with bearings; 170, output wheel; 180, flywheel mounting base; 190, hub motor housing; 191, left structural housing; 192, right cover.

[0031] 200, bearing; 210, external cycloid fixing housing. DETAILED DESCRIPTION OF THE INVENTION

[0032] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0033] It should be noted that the terms "first", "second", etc. in the specification, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0035] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0036] In addition, the terms "install", "set", "provided with", "connect", "connected", "socketed" should be understood in a broad sense. For example, it can be a connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] Embodiment 1

[0039] Referring to the attached Figures 1-5 , a large speed ratio double cycloid gear reduction inner rotor hub motor assembly in this embodiment includes a motor stator 101, a motor rotor 102 and a double cycloid gear reduction mechanism installed in the hub motor 100. The double cycloid gear reduction mechanism includes an external cycloid gear 110, an intermediate cycloid gear 120 and a cycloid output gear 140. The external cycloid gear 110 is fixedly installed in the external cycloid fixed housing 210. The intermediate cycloid gear 120 is installed on the rotor shaft 130 in the hub motor 100 through a bearing 200. The cycloid output gear 140 is coaxially arranged with the external cycloid gear 110. External cycloid teeth four 141 and internal cycloid teeth one 111 are respectively provided on the outer wall of the cycloid output gear 140 and the inner wall of the external cycloid gear 110. External cycloid teeth two 121 and internal cycloid teeth three 122 are respectively provided on both sides of the output end of the intermediate cycloid gear 120. The external cycloid teeth two 121 are meshed with the internal cycloid teeth one 111, and the internal cycloid teeth three 122 are meshed with the external cycloid teeth four 141. A motor shaft 150 penetrating the hub motor 100 is provided at the center of the rotor shaft 130. The motor stator 101 is installed in the hub motor housing 190 through a stator housing. When in use, the motor shaft 150 is installed in the rear flat fork of the bicycle to realize the fixation of the hub motor 100 and the vehicle body.

[0040] In this embodiment, the input end of the intermediate cycloid gear 120 is positioned and installed on the rotor shaft 130 through a bearing 200. The position where the rotor shaft 130 positions and installs the bearing 200 is eccentrically arranged with respect to the axis of the rotor shaft. The rotor shaft 130 drives the intermediate cycloid gear 120 to perform planetary rotation relative to the external cycloid gear 110 through the bearing 200.

[0041] In this embodiment, the motor stator 101 is connected to the stator housing 103, the stator housing 103 is connected to the motor shaft 150, the motor rotor 102 is fixedly installed on the rotor shaft 130, and the rotor shaft 130 is installed on the motor shaft 150 through bearings on both sides.

[0042] In this embodiment, the cycloid output gear 140 is installed on the output gear 170 through a bearing type one-way clutch 160, and the output gear 170 is installed on the rotor shaft 130 through a bearing.

[0043] In this embodiment, the output gear 170 is installed on the hub motor housing 190 through bolts. A flywheel installation base 180 is provided between the output gear 170 and the hub motor housing 190. The bolts pass through the flywheel installation base 180, and the flywheel installation base 180 is coaxial with the motor shaft 150.

[0044] The hub motor housing 190 of this embodiment includes a left structural housing 191 and a right cover 192. The left structural housing 191 is mounted on the motor shaft 150 through a bearing and is sealed with an oil seal. The right cover 192 is mounted on the left structural housing 191 and presses the flywheel mounting base 180.

[0045] The external cycloid fixed housing of this embodiment is positioned and mounted on the right cover 192 through a bearing.

[0046] The output wheel and the cycloid output wheel of this embodiment are connected by a bearing one-way clutch.

[0047] The working principle of this embodiment is divided into different driving modes, which are specifically as follows:

[0048] The bearing one-way clutch arranged inside the hub motor can automatically engage and disengage according to the motor drive and human drive conditions, realizing different motion modes.

[0049] When electrically driven: The motor rotor 102 drives the rotor shaft 130 to rotate. The rotational motion of the rotor shaft 130 drives the intermediate cycloid gear 120 to perform planetary rotation relative to the external cycloid gear 110 through the eccentric shaft setting structure. At the same time, the intermediate cycloid gear 120 drives the cycloid output gear 140 to perform output rotation. At this time, the bearing one-way clutch 160 is engaged, so the cycloid output gear 140 can drive the output gear 170 to rotate. The output gear is connected to the hub motor housing, so the rotation of the motor drives the rotation of this hub motor.

[0050] When pedaling manually: When pedaling manually, the power of the pedal is transmitted to the flywheel through the chainring and chain. At this time, the flywheel drives the flywheel mounting seat to rotate through the internal ratchet mechanism. The flywheel mounting seat is fixedly mounted on the hub motor housing, so it can drive the wheel to rotate and at the same time drive the output gear 170 fixedly mounted on the housing to rotate. At this time, the bearing one-way clutch 160 inside the hub motor is disengaged, so the rotation of the output gear 170 will not drive the rotation of the cycloid reduction mechanism and the motor shaft connected thereto, realizing that when pedaling manually, it will not drive the reduction mechanism and the motor part inside the hub motor to rotate, achieving the same riding effect as an ordinary bicycle.

[0051] The above-described embodiments only express certain implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention; therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A large speed ratio double cycloid gear reduction inner rotor hub motor assembly, characterized in that: The invention comprises a motor stator (101), a motor rotor (102) and a double cycloid gear reduction mechanism installed in a wheel hub motor (100); the double cycloid gear reduction mechanism comprises an outer cycloid wheel (110), an intermediate cycloid wheel (120) and a cycloid output wheel (140); the intermediate cycloid wheel (120) is installed on a rotor shaft (130) in the wheel hub motor (100) via a bearing (200); the cycloid output wheel (140) is coaxially arranged with the outer cycloid wheel (110); the outer wall of the cycloid output wheel (140) and the inner wall of the outer cycloid wheel (110) are respectively provided with There are four outer cycloidal teeth (141) and one inner cycloidal tooth (111); two outer cycloidal teeth (121) and three inner cycloidal teeth (122) are respectively arranged on both sides of the output end of the intermediate cycloidal wheel (120); the two outer cycloidal teeth (121) are meshed with the one inner cycloidal teeth (111); the three inner cycloidal teeth (122) are meshed with the four outer cycloidal teeth (141); a motor shaft (150) penetrating the wheel hub motor (100) is arranged at the center of the rotor shaft (130); and the motor stator (101) is installed in the wheel hub motor housing (190) through the stator housing (103).

2. The high speed ratio double cycloid gear reduction inner rotor hub motor assembly according to claim 1, characterized in that: The outer wall of the outer cycloid wheel (110) is connected to the outer cycloid fixed shell (210), and the input end of the intermediate cycloid wheel (120) is positioned and installed on the rotor shaft (130) through a bearing (200). The position of the bearing for positioning and installing the rotor shaft (130) is eccentrically arranged with respect to the rotor shaft axis. The rotor shaft (130) drives the intermediate cycloid wheel (120) to perform planetary rotation relative to the outer cycloid wheel (110) through the bearing (200).

3. The large speed ratio double cycloid gear reduction inner rotor hub motor assembly according to claim 1 is characterized in that: The motor stator (101) is connected to a stator housing (103), the stator housing (103) is connected to a motor shaft (150), the stator housing (103) is fixedly connected to an epicycloid fixed housing (210), the motor rotor (102) is fixedly mounted on a rotor shaft (130), and the rotor shaft (130) is mounted on the motor shaft (150) via bearings (200) on both sides.

4. The large speed ratio double cycloid gear reduction inner rotor hub motor assembly according to claim 1 is characterized in that: The cycloid output wheel (140) is mounted on the output wheel (170) via a bearing-type one-way clutch (160), and the output wheel (170) is mounted on the rotor shaft (130) via a bearing (200).

5. The large speed ratio double cycloid gear reduction inner rotor hub motor assembly according to claim 4, characterized in that: The output wheel (170) is mounted on a wheel hub motor housing (190) by means of bolts; a flywheel mounting base (180) is provided on the wheel hub motor housing (190); and the flywheel mounting base (180) is mounted on a motor shaft (150) by means of a bearing (200).

6. The large speed ratio double cycloid gear reduction inner rotor hub motor assembly according to claim 1, characterized in that: The hub motor housing (190) comprises a left structural shell (191) and a right cover (192); the left structural shell (191) is mounted on the motor shaft (150) via a bearing (200) and is provided with an oil seal for sealing; the right cover (192) is mounted on the left structural shell (191) and is connected to a flywheel mounting base (180).

7. The large speed ratio double cycloid gear reduction inner rotor hub motor assembly according to claim 2, characterized in that: The epicycloid fixed housing (210) is positioned and mounted on the right cover (192) via a bearing.

8. The high speed ratio double cycloid gear reduction inner rotor hub motor assembly according to claim 1, characterized in that: The output wheel (170) is connected to the cycloid output wheel (140) via a bearing one-way clutch.

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