Middle motor

Abstract

The utility model discloses a built-in motor, and relates to the technical field of motors. The middle motor comprises a motor body and a reduction gearbox; the motor body comprises a machine barrel, a motor rotating shaft arranged in the machine barrel, a rotor fixed on the motor rotating shaft and a stator matched with the rotor; the front end of the motor rotating shaft is connected with the reduction gearbox and used for driving the reduction gearbox; the rear end of the motor rotating shaft is fixedly connected with magnetic steel, the rear end of the machine barrel is provided with a rear cover, and the inner side of the rear cover is provided with a magnetic encoder interacting with the magnetic steel; the rear cover is further provided with a protective cover corresponding to the magnetic encoder, and a sealing gasket is arranged between the protective cover and the rear cover. According to the centrally-mounted motor, the magnetic encoder assembly is integrated in the motor body, the magnetic steel is fixed at the rear end of the motor rotating shaft, and the magnetic encoder is arranged on the inner side of the rear cover, so that the integration level of the motor is higher, and the structure is more compact.

Description

Technical Field

[0001] The utility model relates to the technical field of electric motors, in particular to a mid-mounted motor. Background Art

[0002] Hub motors are commonly used motors on electric motorcycles, but the motor power of electric motorcycles is often limited by the size of the hub motor. If the size is too small, it is difficult to meet the motor power requirements. If the size is too large, it will cause unreasonable structure and complicated installation difficulties when installed on the electric motorcycle. Utility Model Content

[0003] In order to make up for the shortcomings of the prior art, the purpose of the present invention is to provide a mid-mounted motor with the advantages of high integration, reasonable structure, simple installation, high power density, etc.

[0004] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions.

[0005] Provided is a mid-mounted motor comprising a motor body and a reduction gearbox;

[0006] The motor body includes a barrel, a motor shaft disposed in the barrel, a rotor fixed on the motor shaft, and a stator adapted to the rotor;

[0007] The front end of the motor shaft is connected to the reduction gearbox for driving the reduction gearbox;

[0008] The rear end of the motor shaft is fixedly connected to a magnet, the rear end of the barrel is provided with a rear cover, and the inner side of the rear cover is provided with a magnetic encoder that interacts with the magnet;

[0009] The back cover is also provided with a protective cover corresponding to the magnetic encoder, and a sealing gasket is provided between the protective cover and the back cover.

[0010] Preferably, a magnetic steel fixing seat is provided at the rear end of the motor shaft, the magnetic steel fixing seat is connected to the motor shaft via a fastener, and the magnet is arranged on the magnetic steel fixing seat.

[0011] More preferably, the fastener is a bolt; and the magnetic steel is bonded to the magnetic steel fixing seat.

[0012] Furthermore, the outer side of the barrel is provided with three lugs protruding radially outward, and the angle between two adjacent lugs along the radial direction is 50°-180°. Preferably, the thickness of the lugs is consistent with the thickness of the barrel.

[0013] Furthermore, the reduction gear box includes a box cover, a driving gear and an output gear shaft; the front end of the barrel is provided with a front cover, and the outside of the front cover is provided with a accommodating cavity; the box cover seals the mouth of the accommodating cavity, forming a sealed cavity on the inside of the box cover; the front end of the motor shaft extends into the sealed cavity, the driving gear is sleeved on the front end of the motor shaft, the driving gear is engaged with the output gear shaft in the sealed cavity, and the output end of the output gear shaft extends to the outside of the box cover.

[0014] Preferably, among the three lifting ears, two lifting ears are located on one side of the plane where the center line of the motor shaft and the output gear shaft is located, and the other ear is located on the other side of the plane where the center line of the motor shaft and the output gear shaft is located.

[0015] Preferably, the driving gear is sleeved on the front end of the motor shaft through spline fitting.

[0016] Furthermore, the box cover is provided with a vent cap for balancing the air pressure inside and outside the sealed cavity.

[0017] Furthermore, the box cover is provided with an oil drain hole, and the oil drain hole is provided with a strong magnetic oil drain screw.

[0018] Preferably, the inner ring of the stator is evenly distributed with inclined stator teeth, a stator slot is formed between two adjacent stator teeth, and the inclination angle of the stator slot along the circumferential direction of the stator is 15°-30°.

[0019] Preferably, the front cover, the rear cover and the box cover are all provided with heat dissipation ribs.

[0020] The central motor of the utility model integrates a magnetic encoder assembly inside the motor body, fixes the magnet to the rear end of the motor shaft, and arranges the magnetic encoder inside the rear cover, so that the motor has a higher degree of integration and a more compact structure.

[0021] Furthermore, the barrel is provided with lifting ears for fixed connection with the frame of the electric motorcycle, which makes the installation convenient and quick; the three lifting ears are flexibly distributed on the circumference of the barrel and are not prone to assembly interference with other structural parts. In addition, the thickness of the lifting ears is consistent with the thickness of the barrel, which can further improve the installation stability and reliability of the mid-mounted motor.

[0022] Furthermore, the utility model's mid-mounted motor integrates a first-stage reduction mechanism, enabling significant reduction and torque increase with a relatively small transmission ratio. This results in high power and torque densities, significantly improving the electric motorcycle's wheel-side output torque and enhancing its dynamic performance. The stator utilizes a skewed slot structure, effectively reducing tooth harmonic potential, cogging torque, and the resulting vibration and noise, ensuring smooth motor operation. Furthermore, the oil drain hole is sealed with a strong magnetic drain screw, which magnetically attracts impurities generated by gear wear in the gear oil within the reduction gearbox, extending gear life. Furthermore, heat dissipation ribs have been added to the front, rear, and box covers of the mid-mounted motor to increase the heat dissipation area. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a cross-sectional view of the central motor in Example 1 of the present utility model.

[0025] Figure 2 This is a front view of the central motor in Example 1 of the present utility model.

[0026] Figure 3 This is a right side view of the central motor in Example 1 of the present utility model.

[0027] Figure 4 This is a structural diagram of the stator in the mid-mounted motor in Example 1 of the present utility model.

[0028] Description of the symbols in the figure:

[0029] 1-motor body; 2-reduction gearbox; 3-rear cover; 4-barrel; 5-front cover; 6-motor shaft; 61-rotor; 62-stator; 131-stator teeth; 132-stator slots; 7. Protective cover; 8-first bearing; 9-second bearing; 10-box cover; 11-lifting ear; 12-driving gear; 13-vent cap; 14-strong magnetic oil drain screw; 15-third bearing; 16-output gear shaft; 17-fourth bearing; 18-fifth bearing; 19-sprocket; 20-fixing screw; 21-locating pin; 22-waterproof connector; 30-screw; 31-magnetic encoder; 32-magnetic steel fixing seat; 33 magnet; 34-hexagon socket screw; 35-sealing gasket. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0033] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0034] Example 1

[0035] See also Figure 1-3 The mid-mounted motor shown includes a motor body 1 and a reduction gearbox 2 .

[0036] The motor body 1 includes a rear cover 3, a barrel 4, a front cover 5, a motor shaft 6, a rotor 61, and a stator 62. The rear cover 3 is fixed to the rear end of the barrel 4 to seal the rear end of the barrel 4; the front cover 5 is fixed to the front end of the barrel 4 to seal the front end of the barrel 4. The motor shaft 6 is set in the barrel 4, and the rotor 61 is fixed on the motor shaft 6; the stator 62 is fixed in the sealed barrel 4, and the rotor 61 is sleeved in the stator 62. Figure 4 In the stator shown, the inner ring of the stator 62 is evenly distributed with inclined stator teeth 131, and a stator slot 132 is formed between two adjacent stator teeth 131. The inclination angle of the stator slot 132 along the circumferential direction of the stator is 15°-30°, preferably 25°.

[0037] Both ends of the motor shaft 6 are rotatably mounted on the rear cover 3 and the front cover 5. Specifically, a first bearing 8 is provided on the inner side of the rear cover 3, and a second bearing 9 is provided on the inner side of the front cover 5. The rear end of the motor shaft 6 is sleeved in the first bearing 8, and the front end of the motor shaft 6 is sleeved in the second bearing 9.

[0038] A magnetic steel mounting base 32 is provided at the rear end of the motor shaft 6. This mounting base 32 is connected to the motor shaft 6 via fasteners, and a magnet 33 is mounted on the mounting base 32. A magnetic encoder 31 is mounted on the inside of the rear cover 3, interacting with the magnet 33. The rear cover 3 is also provided with a protective cover 7 that corresponds to the magnetic encoder 31, with a sealing gasket 35 positioned between the protective cover 7 and the rear cover 3. In this embodiment, the fasteners are bolts, the magnet 33 is bonded to the mounting base 32, the magnetic encoder 31 is secured to the inside of the rear cover 3 via hexagon socket screws 34, the protective cover 7 is secured to the rear cover 3 via screws 30, and the sealing gasket 35 is an O-ring.

[0039] The reduction box 2 is located at the front end of the motor body 1 and includes a box cover 10, a driving gear 12 and an output gear shaft 16. A accommodating cavity is provided on the outside of the front cover 5. The box cover 10 seals the mouth of the accommodating cavity, forming a sealed cavity on the inside of the box cover 10. In this embodiment, the box cover 10 and the front cover 5 are sealed by a plurality of fixing screws 20, and the box cover 10 and the front cover 5 are provided with matching positioning pins 21 and positioning holes to facilitate the positioning and assembly of the box cover 10 and the front cover 5. At the same time, in order to facilitate the filling of gear lubricating oil and maintenance during the use of the motor, a refueling hole and an oil drain hole are provided on the box cover 10. The refueling hole is provided with a refueling screw, and the oil drain hole is provided with a strong magnetic oil drain screw 14. The box cover 10 is also provided with a vent cap 13 for balancing the air pressure inside and outside the sealed cavity.

[0040] The front end of the motor shaft 6 extends into the sealed chamber. A third bearing 15 is provided on the inner side of the housing cover 10. The front end of the motor shaft 6 is sleeved within the third bearing 15. The driving gear 12 is sleeved on the motor shaft 6, located between the front cover 5 and the third bearing 15. In this embodiment, the front end of the motor shaft 6 is assembled and connected to the driving gear 12 via a spline. This splined connection of the driving gear 12 provides high connection reliability.

[0041] The sealed cavity is also provided with a fourth bearing 17 and a fifth bearing 18. The fourth bearing 17 is provided on the outside of the front cover 5, and the fifth bearing 18 is provided on the inside of the box cover 10. The fourth bearing 17 and the fifth bearing 18 are arranged opposite to each other, and both ends of the output gear shaft 16 are sleeved in the fourth bearing 17 and the fifth bearing 18. The output gear shaft 16 is located below the driving gear 12. The driving gear 12 meshes with the output gear shaft 16 in the sealed cavity. The output end of the output gear shaft 16 extends to the outside of the box cover 10 (as shown in FIG. Figure 1 The output end of the output gear shaft 16 is provided with a sprocket 19.

[0042] The outer side of the barrel 2 is provided with three lugs 11 protruding radially outward. The thickness of the lugs is consistent with the thickness of the barrel. The angle between two adjacent lugs along the radial direction is 50°-180°. In this embodiment, two of the three lugs 11 are located on one side of the plane where the center line of the motor shaft 6 and the output gear shaft 16 is located. The angle between the two lugs is 60°; the other lug 11 is located on the other side of the plane where the center line of the motor shaft and the output gear shaft is located (such as Figure 3 shown).

[0043] In addition, a waterproof joint 22 is provided on the front cover 5 and is located on one side of the reduction gearbox 2 ; heat dissipation ribs are provided on the rear cover 3 , the front cover 5 and the box cover 10 .

[0044] The central motor of this embodiment has the advantages of reasonable structure, simple installation, high power density, etc. The magnetic encoder component is integrated inside the motor body, the magnetic steel is fixed to the rear end of the motor shaft, and the magnetic encoder is arranged on the inner side of the rear cover, so that the motor has a higher degree of integration and a more compact structure. The barrel is fixedly connected to the frame of the electric motorcycle by a lifting lug, which is convenient and quick to install. The three lifting lugs are flexibly distributed on the circumference of the barrel and are not prone to assembly interference with other structural parts. In addition, the thickness of the lifting lug is consistent with the thickness of the barrel, which further improves the installation stability and reliability of the central motor. The integrated first-stage reduction mechanism can achieve significant deceleration and torque-increasing effects with a smaller transmission ratio, resulting in high power density and torque density, significantly improving the output torque of the electric motorcycle's wheel side, and strong dynamic performance. The stator adopts a skewed slot structure, which can effectively weaken the tooth harmonic potential, reduce the cogging torque, and reduce the vibration and noise caused by it, making the motor run smoothly. In addition, the oil drain hole is sealed with a strong magnetic drain screw, which can magnetically absorb impurities generated by gear running-in in the gear oil in the reduction gear box, thereby increasing the gear life. Moreover, heat dissipation ribs are added to the front cover, rear cover and box cover of the mid-mounted motor to increase the heat dissipation area.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A mid-mounted motor, characterized in that: Including motor body and reduction box; The motor body includes a barrel, a motor shaft disposed in the barrel, a rotor fixed on the motor shaft, and a stator adapted to the rotor; The front end of the motor shaft is connected to the reduction gearbox for driving the reduction gearbox; The rear end of the motor shaft is fixedly connected to a magnet, the rear end of the barrel is provided with a rear cover, and the inner side of the rear cover is provided with a magnetic encoder that interacts with the magnet; The back cover is also provided with a protective cover corresponding to the magnetic encoder, and a sealing gasket is provided between the protective cover and the back cover.

2. The mid-mounted motor according to claim 1, characterized in that: A magnetic steel fixing seat is provided at the rear end of the motor shaft. The magnetic steel fixing seat is connected to the motor shaft via a fastener. The magnetic steel is arranged on the magnetic steel fixing seat.

3. The mid-mounted motor according to claim 2, characterized in that: The fasteners are bolts; the magnetic steel is bonded to the magnetic steel fixing seat.

4. The mid-mounted motor according to claim 1, characterized in that: The outer side of the barrel is provided with three lifting ears protruding outward in the radial direction thereof, and the angle between two adjacent lifting ears in the radial direction thereof is 50°-180°.

5. The mid-mounted motor according to claim 4, characterized in that: The reduction gearbox includes a box cover, a driving gear and an output gear shaft; the front end of the barrel is provided with a front cover, and the outside of the front cover is provided with a accommodating cavity; the box cover seals the mouth of the accommodating cavity, forming a sealed cavity inside the box cover; the front end of the motor shaft extends into the sealed cavity, the driving gear is sleeved on the front end of the motor shaft, the driving gear is engaged with the output gear shaft in the sealed cavity, and the output end of the output gear shaft extends to the outside of the box cover.

6. The mid-mounted motor according to claim 5, characterized in that: Of the three lifting ears, two are located on one side of the plane where the center line of the motor shaft and the output gear shaft is located, and the other ear is located on the other side of the plane where the center line of the motor shaft and the output gear shaft is located.

7. The mid-mounted motor according to claim 5, characterized in that: The driving gear is sleeved on the front end of the motor shaft through spline matching.

8. The mid-mounted motor according to claim 5, characterized in that: The box cover is provided with a vent cap for balancing the air pressure inside and outside the sealed cavity.

9. The mid-mounted motor according to claim 5, characterized in that: The box cover is provided with an oil drain hole, and the oil drain hole is provided with a strong magnetic oil drain screw.

10. The mid-mounted motor according to claim 1, characterized in that: The inner ring of the stator is evenly distributed with inclined stator teeth, and a stator slot is formed between two adjacent stator teeth. The inclination angle of the stator slot along the circumferential direction of the stator is 15°-30°.

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