Differential motor and electric vehicle

Abstract

The utility model provides a differential motor and an electric vehicle, and relates to the technical field of electric vehicles. The motor comprises a motor body and a differential mechanism, the motor body comprises a motor shell, a stator, a rotor and two output shafts, the stator, the rotor and the two output shafts are arranged in the motor shell, the rotor can rotate relative to the stator, the rotor comprises an inner ring, an outer ring and a connecting plate connecting the inner ring and the outer ring, and the differential mechanism is located in the inner ring and connected with the inner ring. The stator is located between the inner ring and the outer ring and connected with the motor shell, and the two output ends of the differential mechanism are connected with the two output shafts respectively. According to the differential motor, the differential is arranged in the motor shell, and the differential is directly driven to rotate through the rotor. Compared with the prior art that the motor and the differential mechanism are two mutually-separated independent parts and need to be installed separately and drive connection between the motor and the differential mechanism is achieved through a connecting structure, the motor provided by the embodiment of the utility model has the advantages that the power assisting efficiency is improved, the cost is low, and installation is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and more specifically, to a differential motor and an electric vehicle. Background Art

[0002] At present, electric power-assisted tricycles have basic riding, power-assisted, speed display, battery voltage display, mileage recording and other functions. The existing electric power-assisted tricycle drive system generally includes: instruments, controllers, batteries, sensors, motors and other components. In addition, electric power-assisted tricycles also need to install a differential separately. The main function of the differential is to allow different tires to rotate at different speeds, solve the problem caused by the different rotation speeds of the inner and outer tires when turning during the driving process of the electric power-assisted tricycle, and keep the vehicle balanced and stable when turning.

[0003] In the existing electric power-assisted tricycle, the motor and the differential are two independent components, which can be connected by a chain, the motor drives the differential to rotate, and the left and right shafts of the differential respectively drive the two wheels to rotate. However, this design will lead to a high cost of the electric power-assisted tricycle and is not convenient for the installation of the motor and the differential. Utility Model Content

[0004] The purpose of the present application is to provide a differential motor and an electric vehicle in view of the deficiencies in the above-mentioned prior art, which have low cost, are easy to install and have improved power assist efficiency.

[0005] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0006] According to one aspect of an embodiment of the present application, a differential motor is provided, comprising: a motor body and a differential, the motor body comprising a motor housing, a stator arranged in the motor housing, a rotor and two output shafts, the rotor being capable of rotating relative to the stator, the rotor comprising an inner ring and an outer ring coaxially arranged, and a connecting plate connecting the inner ring and the outer ring, the differential being located in the inner ring and connected to the inner ring, the stator being located between the inner ring and the outer ring and connected to the motor housing, and the two output ends of the differential being respectively connected to the two output shafts.

[0007] Optionally, the motor body also includes an iron core, which is located between the stator and the rotor, and a coil is wound on the iron core. The inner wall of the outer ring is provided with a plurality of magnets, and the plurality of magnets are distributed at intervals along the circumferential direction of the outer ring. When the coil is energized, the magnetic field generated by the coil interacts with the magnet to make the rotor rotate relative to the stator.

[0008] Optionally, the motor housing includes an annular motor wheel shell and two end covers respectively arranged on the two end faces of the motor wheel shell. The two end covers are respectively provided with fixing frames on the side away from the motor wheel shell, and the fixing frames are used to cooperate with the electric vehicle. The end covers and the fixing frames are also provided with through holes, and the through holes are used for the output shaft to pass through.

[0009] Optionally, first bearings are respectively provided in the two end covers, and the outer surface of the first bearings is adapted to the end covers, and the inner surface of the first bearings is adapted to the differential.

[0010] Optionally, a plurality of first recessed holes are provided on an end cover, a plurality of second recessed holes corresponding to the first recessed holes are provided on the end surface of the stator, and connecting columns are provided in the first recessed holes and the second recessed holes, and the connecting columns connect the stator and the end cover.

[0011] Optionally, the differential includes a differential housing and two first bevel gears and two second bevel gears arranged in the differential housing, the two first bevel gears and the two second bevel gears are respectively coaxially symmetrically arranged, the two first bevel gears are respectively meshed with the two second bevel gears at the same time, the two first bevel gears are connected to the differential housing, the differential housing is connected to the inner ring, and the two second bevel gears are respectively connected to the two output shafts.

[0012] Optionally, an annular lug is provided on the differential housing, and an end surface of the annular lug is connected to an end surface of the inner ring.

[0013] Optionally, the differential further comprises a first clamping column, the two first bevel gears are respectively sleeved on the first clamping column, and both ends of the first clamping column are respectively located in the differential housing.

[0014] Optionally, the differential further includes a second clamping column, which is arranged in the output shaft along the radial direction of the output shaft, and both ends of the second clamping column are respectively located in the second bevel gear.

[0015] According to another aspect of an embodiment of the present application, an electric vehicle is provided, comprising a vehicle body and a differential motor as described above and arranged on the vehicle body.

[0016] The beneficial effects of this application include:

[0017] The present application provides a differential motor, comprising: a motor body and a differential, the motor body comprising a motor housing, a stator disposed in the motor housing, a rotor and two output shafts, the rotor being able to rotate relative to the stator, the rotor comprising an inner ring and an outer ring disposed coaxially, and a connecting plate connecting the inner ring and the outer ring, the differential being located inside the inner ring and connected to the inner ring, the stator being located between the inner ring and the outer ring and connected to the motor housing, and the two output ends of the differential being connected to the two output shafts respectively. The differential motor arranges the differential inside the motor housing, and directly drives the differential to rotate through the rotor. Compared with the prior art in which the motor and the differential are two separate independent components that need to be installed separately and realize the driving connection between the two through a connecting structure, the motor power-assisting efficiency provided by the embodiment of the present application is improved, the cost is low and it is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a differential motor provided in an embodiment of the present application;

[0020] Figure 2 for Figure 1 Sectional view at AA in the middle;

[0021] Figure 3 A schematic diagram of a partial structure of a differential motor provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of a differential and an output shaft in a differential motor provided in an embodiment of the present application;

[0023] Figure 5 for Figure 4 Cross-sectional view at BB in the middle.

[0024] Icons: 10-differential motor; 11-motor body; 111-motor housing; 1111-motor wheel housing; 1112-end cover; 112-stator; 1121-second recessed hole; 1122-connecting column; 113-rotor; 1131-inner ring; 1132-outer ring; 1133-connecting plate; 114-output shaft; 115-iron core; 1151-iron core body; 1152-winding arm; 116-fixing frame; 117-first bearing; 118-second bearing; 12-differential; 121-differential housing; 1211-first differential housing; 1212-second differential housing; 1213-annular lug; 122-first bevel gear; 123-second bevel gear; 124-first clamping column; 125-second clamping column; 13-bolt. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. It should be noted that, in the absence of conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In one aspect of the embodiment of the present application, please refer to Figure 1 and Figure 2 A differential motor 10 is provided, comprising: a motor body 11 and a differential 12, the motor body 11 comprising a motor housing 111, a stator 112 arranged in the motor housing 111, a rotor 113 and two output shafts 114, the rotor 113 can rotate relative to the stator 112, the rotor 113 comprises a coaxially arranged inner ring 1131, an outer ring 1132, and a connecting plate 1133 connecting the inner ring 1131 and the outer ring 1132, the differential 12 is located in the inner ring 1131 and connected to the inner ring 1131, the stator 112 is located between the inner ring 1131 and the outer ring 1132, and connected to the motor housing 111, and the two output ends of the differential 12 are respectively connected to the two output shafts 114.

[0031] The differential motor 10 has the differential 12 built into the motor housing 111. The motor housing 111 is also provided with a stator 112, a rotor 113 and two output shafts 114, wherein the stator 112 is fixed relative to the motor, and the rotor 113 can rotate in the motor housing 111 after being driven. The rotor 113 includes an inner ring 1131 and an outer ring 1132 sleeved outside the inner ring 1131. The axes of the inner ring 1131 and the outer ring 1132 coincide with each other. The inner ring 1131 and the outer ring 1132 are connected as a whole through a connecting plate 1133. Preferably, one end of the connecting plate 1133 is connected to the end face of the outer ring 1132, and the other end is connected to the end face of the inner ring 1131. A first accommodation space is formed between the outer ring 1132 and the inner ring 1131 of the rotor 113, and the stator 112 is located in the first accommodation space. A second accommodating space is formed in the inner ring 1131 of the rotor 113, and the differential 12 is arranged in the second accommodating space and fixedly connected to the rotor 113. When the rotor 113 rotates, it can drive the differential 12 to rotate together. The two ends of the differential 12 are respectively fixedly connected to the two output shafts 114, and the axes of the output shafts 114 coincide with the rotation axis of the differential 12. The ends of the two output shafts 114 away from the differential 12 extend out of the motor housing 111 and are connected to the wheels. When the differential 12 rotates, it drives the two output shafts 114 to rotate, and thus the power output of the differential motor 10 is realized.

[0032] It should be noted that, in this embodiment, there is no limitation on the manner of driving the rotor 113 to rotate relative to the stator 112 , and the rotor 113 may be driven by electromagnetic means, mechanical structure, or other means.

[0033] The differential motor 10 sets the differential 12 inside the motor housing 111, and directly drives the differential 12 to rotate through the rotor 113. Compared with the prior art in which the motor and the differential 12 are two separate independent components that need to be installed separately and the driving connection between the two is achieved through a connecting structure, the differential motor 10 provided in the embodiment of the present application has improved power assist efficiency, low cost and easy installation.

[0034] Optionally, see Figure 2 and Figure 3 The motor body 11 also includes an iron core 115, which is located between the stator 112 and the rotor 113. A coil (not shown in the figure) is wound around the iron core 115. A plurality of magnets (not shown in the figure) are provided on the inner wall of the outer ring 1132. The plurality of magnets are distributed at intervals along the circumferential direction of the outer ring 1132. When the coil is energized, the magnetic field generated by the coil interacts with the magnet to make the rotor 113 rotate relative to the stator 112.

[0035] The iron core 115 includes an iron core body 1151 and a plurality of winding arms 1152 arranged at intervals along the circumferential direction of the iron core body 1151, and a coil is wound on each winding arm 1152. The inner wall of the outer ring 1132 is provided with a plurality of magnets along the circumferential direction, and the magnets are located between the outer ring 1132 and the winding arms 1152. When the power supply is energized to the coil, the coil generates a rotating magnetic field, and the magnets rotate around the axis of the iron core 115 under the action of the magnetic field, thereby driving the rotor 113 to rotate.

[0036] Optionally, the motor housing 111 includes an annular motor wheel housing 1111, and two end covers 1112 respectively arranged on the two end surfaces of the motor wheel housing 1111, the stator 112, the rotor 113 and the differential 12 are all arranged in the motor wheel housing 1111, and the two end covers 1112 respectively close the two sides of the motor wheel housing 1111. The two end covers 1112 are respectively provided with a fixing frame 116 on the side away from the motor wheel housing 1111, and the fixing frame 116 is used to cooperate with the electric vehicle to fix the motor on the electric vehicle. The end cover 1112 and the fixing frame 116 are also provided with a through hole, and the through hole is used for the output shaft 114 to pass through, so that the output shaft 114 can be connected to the wheel.

[0037] For example, the end cover 1112 and the motor wheel housing 1111 , and the end cover 1112 and the fixing frame 116 are fixedly connected by bolts 13 .

[0038] In order to reduce the friction between the differential 12 and the motor housing 111 and make the differential 12 rotate more smoothly, optionally, first bearings 117 are respectively provided in the two end covers 1112 , and the outer surface of the first bearing 117 is adapted to the end cover 1112 , and the inner surface is adapted to the differential 12 .

[0039] The end cover 1112 is provided with a first bearing groove on one side facing the motor wheel housing 1111. The first bearing 117 is located in the first bearing groove, and the outer surface of the first bearing 117 is matched with the inner surface of the first bearing groove. The differential 12 is partially inserted into the first bearing 117 and matched with the inner surface of the first bearing 117.

[0040] Optionally, a second bearing 118 is respectively disposed in the two fixing frames 116 , and the outer surface of the second bearing 118 is adapted to the fixing frame 116 , and the inner surface of the second bearing 118 is adapted to the output shaft 114 .

[0041] A second bearing groove is provided on the side of the fixing frame 116 away from the motor wheel housing 1111. The second bearing 118 is located in the second bearing groove, and the outer surface of the second bearing 118 is matched with the inner surface of the second bearing groove. The output shaft 114 extends out of the fixing frame 116 after passing through the second bearing 118, and the outer surface of the output shaft 114 is matched with the inner surface of the second bearing 118. The second bearing 118 can provide support for the output shaft 114, reduce the friction between the output shaft 114 and the fixing frame 116, and make the rotation of the output shaft 114 smoother.

[0042] Optionally, a plurality of first recessed holes are provided on an end cover 1112 , a plurality of second recessed holes 1121 corresponding to the first recessed holes are provided on the end surface of the stator 112 , and connecting columns 1122 are provided in the first recessed holes and the second recessed holes 1121 , and the connecting columns 1122 connect the stator 112 to the end cover 1112 .

[0043] The stator 112 is fixed on one of the two end covers 1112. The end cover 1112 is provided with a plurality of first concave holes, which are spaced apart along the circumferential direction of the end cover 1112. Accordingly, a plurality of second concave holes 1121 are provided on the end surface of the stator 112, and each second concave hole 1121 corresponds to a first concave hole. A connecting column 1122 is penetrated in each pair of the first concave hole and the second concave hole 1121, and the connecting column 1122 is fixed relative to the first concave hole and the second concave hole 1121, respectively. The stator 112 and the end cover 1112 are fixedly connected by the plurality of connecting columns 1122.

[0044] Optionally, see Figure 4 and Figure 5 The differential 12 includes a differential housing 121 and two first bevel gears 122 and two second bevel gears 123 arranged in the differential housing 121. The two first bevel gears 122 and the two second bevel gears 123 are respectively coaxially symmetrically arranged, and the two first bevel gears 122 are respectively meshed with the two second bevel gears 123 at the same time. The two first bevel gears 122 are connected to the differential housing 121, the differential housing 121 is connected to the inner ring 1131, and the two second bevel gears 123 are respectively connected to the two output shafts 114.

[0045] The axes of the two first bevel gears 122 overlap and are symmetrically arranged, the axes of the two second bevel gears 123 overlap and are symmetrically arranged, and the axis of the first bevel gear 122 is perpendicular to the axis of the second bevel gear 123. The two sides of the first bevel gear 122 are respectively meshed with the two second bevel gears 123, and the two sides of the second bevel gear 123 are also respectively meshed with the two first bevel gears 122. The differential housing 121 is connected to the inner ring 1131 of the rotor 113 and rotates under the drive of the rotor 113. The axes of the two second bevel gears 123 overlap with the rotation axis of the differential housing 121, and the two first bevel gears 122 are fixedly connected to the differential housing 121. When the differential housing 121 rotates, the two first bevel gears 122 follow the differential housing 121 and rotate around the rotation axis of the differential housing 121. Since the second bevel gear 123 is meshed with the first bevel gear 122 , the two second bevel gears 123 will also rotate around the rotation axis of the differential housing 121 , thereby driving the output shaft 114 to rotate.

[0046] For example, the differential housing 121 includes a first differential housing 1211 and a second differential housing 1212, the first differential housing 1211 and the second differential housing 1212 are connected to form a third accommodating space, and the two first bevel gears 122 and the two second bevel gears 123 are both located in the third accommodating space. Furthermore, the first differential housing 1211 and the second differential housing 1212 are fixedly connected by bolts 13.

[0047] Optionally, see Figure 2 and Figure 5 The differential housing 121 is provided with an annular lug 1213 , and the end surface of the annular lug 1213 is connected to the end surface of the inner ring 1131 .

[0048] The annular lug 1213 extends along the circumferential direction of the differential housing 121 . After the differential housing 121 extends into the inner ring 1131 of the rotor 113 , the annular lug 1213 is located outside the inner ring 1131 and opposite to the end face of the inner ring 1131 . The differential housing 121 is fixed to the end face of the inner ring 1131 through the annular lug 1213 .

[0049] For example, the end surface of the annular lug 1213 is fixedly connected to the end surface of the inner ring 1131 by means of bolts 13 .

[0050] Optionally, the differential 12 further includes a first clamping column 124 , and the two first bevel gears 122 are respectively sleeved on the first clamping column 124 , and two ends of the first clamping column 124 are respectively located in the differential housing 121 .

[0051] The first clamping column 124 is coaxially arranged with the first bevel gear 122, and the two first bevel gears 122 are symmetrically sleeved on the first clamping column 124. Both ends of the first clamping column 124 are respectively inserted into the differential housing 121, and the differential housing 121 drives the two first bevel gears 122 to rotate around the rotation axis of the differential housing 121 through the first clamping column 124.

[0052] Optionally, the differential 12 further includes a second clamping column 125 , which is disposed in the output shaft 114 along the radial direction of the output shaft 114 , and both ends of the second clamping column 125 are respectively located in the second bevel gear 123 .

[0053] The axis of the second clamping column 125 is perpendicular to the axis of the output shaft 114 and intersects with the axis of the output shaft 114. After the second clamping column 125 passes through the output shaft 114, both ends thereof are exposed from the output shaft 114. Both ends of the second clamping column 125 are respectively inserted into the same second bevel gear 123, and the second bevel gear 123 drives the output shaft 114 to rotate through the second clamping column 125.

[0054] Optionally, a flywheel is sleeved on one of the output shafts 114, a chain is sleeved on the outer ring of the flywheel, and the chain is also sleeved on the sprocket of the pedal of the electric vehicle, thereby realizing the driving connection between the flywheel and the sprocket.

[0055] This embodiment further provides an electric vehicle, comprising a vehicle body and a differential motor 10 as described above and arranged on the vehicle body.

[0056] The electric vehicle may be an electric power-assisted tricycle, an electric power-assisted car, etc. The electric vehicle includes the same structure and beneficial effects as the differential motor 10 in the aforementioned embodiment. The structure and beneficial effects of the differential motor 10 have been described in detail in the aforementioned embodiment and will not be repeated here.

[0057] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A differential motor, characterized in that: include: A motor body and a differential, wherein the motor body includes a motor housing, a stator arranged in the motor housing, a rotor and two output shafts, the rotor can rotate relative to the stator, the rotor includes an inner ring and an outer ring arranged coaxially, and a connecting plate connecting the inner ring and the outer ring, the differential is located in the inner ring and connected to the inner ring, the stator is located between the inner ring and the outer ring and connected to the motor housing, and the two output ends of the differential are respectively connected to the two output shafts.

2. The differential motor according to claim 1, characterized in that: The motor body also includes an iron core, which is located between the stator and the rotor. A coil is wound on the iron core. A plurality of magnets are provided on the inner wall of the outer ring. The plurality of magnets are distributed at intervals along the circumferential direction of the outer ring. When the coil is energized, the magnetic field generated by the coil interacts with the magnet to make the rotor rotate relative to the stator.

3. The differential motor according to claim 1, characterized in that: The motor housing includes an annular motor wheel shell and two end covers respectively arranged on the two end surfaces of the motor wheel shell. The two end covers are respectively provided with fixing frames on the side away from the motor wheel shell, and the fixing frames are used to cooperate with the electric vehicle. The end covers and the fixing frames are also provided with through holes, and the through holes are used for the output shaft to pass through.

4. The differential motor according to claim 3, characterized in that: A first bearing is respectively arranged in the two end covers, and the outer surface of the first bearing is adapted to the end cover, and the inner surface of the first bearing is adapted to the differential.

5. The differential motor according to claim 3, characterized in that: A plurality of first recessed holes are arranged on one of the end covers, a plurality of second recessed holes corresponding to the first recessed holes are arranged on the end surface of the stator, and connecting columns are arranged in the first recessed holes and the second recessed holes, and the connecting columns connect the stator and the end cover.

6. The differential motor according to claim 1, characterized in that: The differential includes a differential housing and two first bevel gears and two second bevel gears arranged in the differential housing, the two first bevel gears and the two second bevel gears are respectively coaxially symmetrically arranged, the two first bevel gears are respectively meshed with the two second bevel gears at the same time, the two first bevel gears are connected to the differential housing, the differential housing is connected to the inner ring, and the two second bevel gears are respectively connected to the two output shafts.

7. The differential motor according to claim 6, characterized in that: The differential housing is provided with an annular lug, and the end surface of the annular lug is connected to the end surface of the inner ring.

8. The differential motor according to claim 6, characterized in that: The differential also includes a first clamping column, the two first bevel gears are respectively sleeved on the first clamping column, and both ends of the first clamping column are respectively located in the differential housing.

9. The differential motor according to claim 6, characterized in that: The differential further includes a second clamping column, which is arranged in the output shaft along the radial direction of the output shaft, and both ends of the second clamping column are respectively located in the second bevel gear.

10. An electric vehicle, characterized in that: The invention comprises a vehicle body and a differential motor as claimed in any one of claims 1 to 9 arranged on the vehicle body.

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