CN221263553U - Hub motor - Google Patents

Abstract

The utility model discloses a hub motor, which comprises a main shaft, a hub shell, a stator winding, a rotor and a planetary gear transmission mechanism, wherein a sun gear of the planetary gear transmission mechanism is rotatably connected to the main shaft and connected with the rotor, and a planet gear of the planetary gear transmission mechanism is in transmission connection with the hub shell; the main shaft comprises a first shaft and a second shaft which are coaxially arranged, the first end of the first shaft is arranged in the hub shell, and a first connecting part is arranged at the first end of the first shaft; the first end of the second shaft is arranged in the hub shell, the position, close to the first end, of the second shaft is provided with a mounting part for mounting the sun gear, and the first end of the second shaft is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected. The hub motor not only ensures that the diameter of the sun gear is not limited by the diameter of the main shaft, reduces the number of teeth of the sun gear and reduces the volume, but also has large output torque, simple assembly process and high production efficiency.

Description

Hub motor

Technical Field

The utility model relates to the technical field of driving motors, in particular to a hub motor.

Background

The electric bicycle is composed of a set of driving motor added on the basis of a common bicycle, the driving motor is powered by a storage battery arranged on a bicycle frame, and the driving motor rotates to drive the electric bicycle to travel, and the driving motor is generally arranged in a front hub or a rear hub, so that the electric bicycle is also called as a hub motor. The hub motor is used as a power core component on the electric power-assisted vehicle, and the development of the hub motor in the industry at present takes miniaturization, high power and high output torque as main trend.

The common practice of the related art hub motor for downsizing is to reduce the number of teeth of the sun gear or the outer diameter of the sun gear in the planetary reduction gear, so that the main shaft of the hub motor is made in two stages, thus ensuring that the diameter of the sun gear located in the middle is not limited by the diameter of the main shaft. The two-section hub motor is characterized in that a sun gear of a planetary reduction transmission mechanism can be arranged between the two sections of half shafts, so that the diameter of the sun gear is ensured not to be limited by the diameter of the main shaft. Therefore, the number of teeth of the sun gear can be further reduced, and the speed ratio or the transmission ratio of the hub motor can be increased.

In the related art, the hub motor with the main shaft made of two sections has the following defects in the actual use process: the left half shaft and the right half shaft of the hub motor are not associated with each other in a supporting way, so that the supporting strength is low, the output torque is limited to be improved, concentricity between the two half shafts is required to be corrected during assembly, the requirement on the machining precision of the parts is high, the assembly process is complex, and the production efficiency is low.

Disclosure of utility model

The application aims to overcome the defects of the related art, and provides the hub motor which not only ensures that the diameter of the sun gear is not limited by the diameter of the main shaft, reduces the number of teeth of the sun gear and reduces the volume, but also has large output torque, simple assembly process and high production efficiency.

The technical scheme of the application is that a hub motor with the following structure is provided: the planetary gear transmission mechanism comprises a main shaft, a hub shell, a stator winding, a rotor and a planetary gear transmission mechanism, wherein a sun gear of the planetary gear transmission mechanism is rotatably connected to the main shaft and connected with the rotor, and a planet gear of the planetary gear transmission mechanism is in transmission connection with the hub shell; the main shaft comprises a first shaft and a second shaft which are coaxially arranged, the first end of the first shaft is arranged in the hub shell, and a first connecting part is arranged at the first end of the first shaft; the first end of the second shaft is arranged in the hub shell, the position, close to the first end, of the second shaft is provided with a mounting part for mounting the sun gear, and the first end of the second shaft is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected; the second end of the first shaft and the second end of the second shaft are both disposed outside the hub shell and are configured for frame installation.

In some embodiments, a section of threaded hole is formed on the end surface of the first end of the first shaft in an inward axial manner, and the threaded hole forms the first connecting part; a first end of the second shaft is axially connected with a threaded column, and the threaded column forms the second connecting part; the threaded column is in threaded connection with the threaded hole.

In some embodiments, a receptacle for the mounting portion to be inserted is formed between the threaded bore and an end face of the first shaft first end.

In some embodiments, a first annular step is formed between the insertion hole and the threaded hole, a second annular step is formed between the threaded column and the mounting portion, and after the threaded column of the second shaft is connected with the threaded hole of the first shaft, the second annular step is tightly attached to the first annular step.

In some embodiments, the first end of the first shaft is provided with a radially outwards protruding annular boss, and a limiting step is formed on the second shaft at one end of the mounting part away from the first shaft, and when the second shaft is connected to the first shaft, the annular boss and the limiting step form a mounting space for mounting the sun gear.

In some embodiments, the first end of the first shaft is radially provided with a first pin bore and the first end of the second shaft is radially provided with a second pin bore; after the second shaft is connected with the first shaft, the second pin hole is overlapped with the first pin hole, and a pin shaft for preventing the first shaft and the second shaft from rotating relatively is connected in the second pin hole and the first pin hole.

In some embodiments, the hub shell is rotatably connected with the first shaft through a first bearing, and a toothed ring is circumferentially arranged in the hub shell; the planet wheel of the planetary gear transmission mechanism is meshed with the toothed ring for transmission; one end of the hub shell is connected with an end cover, the end cover is connected with the base, and the base is rotatably connected with the second shaft through a second bearing.

The other technical solution of the present application is to provide a hub motor having the following structure: the planetary gear transmission mechanism comprises a main shaft, a hub shell, a stator winding, a rotor and a planetary gear transmission mechanism, wherein a sun gear of the planetary gear transmission mechanism is rotatably connected to the main shaft and connected with the rotor, and a planet gear of the planetary gear transmission mechanism is in transmission connection with the hub shell; the main shaft comprises a first shaft and a second shaft which are coaxially arranged, the first end of the first shaft is arranged in the hub shell, and a first connecting part is arranged at the first end of the first shaft; the first end of the second shaft is arranged in the hub shell, the position, close to the first end, of the second shaft is provided with a mounting part for mounting the sun gear, and the first end of the second shaft is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected; the second end of the first shaft and the second end of the second shaft are both arranged outside the hub shell and are used for mounting a frame; the end face of the first end of the second shaft is concavely provided with a section of threaded hole along the axial direction, and the threaded hole forms the second connecting part; a first end of the first shaft is axially connected with a threaded column, and the threaded column forms the first connecting part; the threaded column is in threaded connection with the threaded hole.

The other technical solution of the present application is to provide a hub motor having the following structure: the planetary gear transmission mechanism comprises a main shaft, a hub shell, a stator winding, a rotor and a planetary gear transmission mechanism, wherein a sun gear of the planetary gear transmission mechanism is rotatably connected to the main shaft and connected with the rotor, and a planet gear of the planetary gear transmission mechanism is in transmission connection with the hub shell; the main shaft comprises a first shaft and a second shaft which are coaxially arranged, the first end of the first shaft is arranged in the hub shell, and a first connecting part is arranged at the first end of the first shaft; the first end of the second shaft is arranged in the hub shell, the position, close to the first end, of the second shaft is provided with a mounting part for mounting the sun gear, and the first end of the second shaft is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected; the second end of the first shaft and the second end of the second shaft are both arranged outside the hub shell and are used for mounting a frame; and a coaxial connector is arranged between the first shaft and the second shaft, one end of the coaxial connector is connected with the first end of the first shaft, and the other end of the coaxial connector is connected with the first end of the second shaft.

The other technical solution of the present application is to provide a hub motor having the following structure: the planetary gear transmission mechanism comprises a main shaft, a hub shell, a stator winding, a rotor and a planetary gear transmission mechanism, wherein a sun gear of the planetary gear transmission mechanism is rotatably connected to the main shaft and connected with the rotor, and a planet gear of the planetary gear transmission mechanism is in transmission connection with the hub shell; the main shaft comprises a first shaft and a second shaft which are coaxially arranged, the first end of the first shaft is arranged in the hub shell, and a first connecting part is arranged at the first end of the first shaft; the first end of the second shaft is arranged in the hub shell, the position, close to the first end, of the second shaft is provided with a mounting part for mounting the sun gear, and the first end of the second shaft is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected; the second end of the first shaft and the second end of the second shaft are both arranged outside the hub shell and are used for mounting a frame; an end face of the first end of the first shaft is concavely provided with a plug hole along the axial direction, and the plug hole forms the first connecting part; the first end of the first shaft is axially connected with a plug-in column, and the plug-in column forms the second connecting part; the plug-in column is in plug-in fit with the plug-in hole.

In summary, compared with the related art, the hub motor has the following advantages:

Firstly, the hub motor is used for arranging the main shaft into two sections, namely, the main shaft is divided into a first shaft and a second shaft, the first shaft and the second shaft are coaxially arranged, and the first shaft and the second shaft are connected in a detachable mode through a first connecting part and a second connecting part to realize splicing and separation of the main shaft; when the sun gear of the planetary gear transmission mechanism is installed, the first shaft and the second shaft can be separated, and after the sun gear is installed, the first shaft and the second shaft are coaxially connected; the installation of the sun gear is not limited by the diameter of the whole main shaft, the outer diameter of the installation part on the second shaft can be reduced, the diameter of the sun gear is reduced, the number of teeth of the sun gear is reduced, and the speed ratio or the transmission ratio of the planetary gear transmission mechanism is increased; compared with the hub motor in the related art, under the condition that the speed ratio or the transmission ratio of the planetary gear transmission mechanism is the same, the volume or the size of the hub shell can be reduced due to the reduction of the number of teeth or the diameter of the sun gear, so that the whole structure of the hub motor is more compact and the whole volume is more miniaturized; in addition, compared with the hub motor of the related art, when the volume or the size of the hub shell is the same, the number of teeth or the diameter of the sun gear is reduced, so that the output torque of the hub motor is large, and the provided rotating speed is high. Secondly, the first shaft and the second shaft which are divided into two sections of the main shaft are connected together, so that the supporting strength of the whole main shaft is improved, and the output torque of the hub motor can be effectively improved; furthermore, when the hub motor is assembled, because the first shaft and the second shaft are coaxially connected, the concentricity between the first shaft and the second shaft does not need to be checked or regulated, and compared with the hub motor in the related art, the hub motor has lower requirements on the machining precision of parts, and the hub motor is simple and convenient in assembly process and higher in production efficiency.

Drawings

Fig. 1 is a schematic cross-sectional structural view of an in-wheel motor according to some embodiments of the present application.

Fig. 2 is a schematic view of a semi-sectional structure of an in-wheel motor according to some embodiments of the present application.

Fig. 3 is a schematic view of a connection structure of a spindle of an in-wheel motor according to some embodiments of the present application.

Fig. 4 is a partial sectional structure schematic view of a spindle of an in-wheel motor according to some embodiments of the present application.

Fig. 5 is another partial sectional structure schematic view of a spindle of an in-wheel motor according to some embodiments of the present application.

Fig. 6 is a schematic view of a spindle mounting structure of an in-wheel motor according to some embodiments of the present application.

Fig. 7 is another spindle mounting structure schematic view of an in-wheel motor according to some embodiments of the present application.

Reference numerals illustrate:

1. Spindle, 100, first shaft, 101, second shaft, 102, threaded hole, 103, threaded post, 104, socket, 105, mount, 106, first annular step, 107, second annular step, 108, second pin hole, 109, first pin hole, 110, annular boss, 111, limit step, 112, plug post, 113, plug hole, 114, coaxial connector, 2, hub shell, 200, end cap, 3, planetary gear drive, 300, planetary gear carrier, 301, sun gear, 302, planetary gear, 303, toothed ring, 4, rotor, 400, stator winding, 5, first bearing, 500, second bearing, 6, base.

Detailed Description

First, it should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adapt it as desired to suit a particular application.

In describing embodiments of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present application will be understood in detail by those of ordinary skill in the art.

In embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

The utility model will be described in further detail with reference to the drawings and the specific examples.

As shown in fig. 1 to 4; the embodiment of the application discloses a hub motor, which structurally comprises a main shaft 1, a hub shell 2, a stator winding 400, a rotor 4 and a planetary gear transmission mechanism 3, wherein the main shaft 1 is arranged in the hub shell 2 in a penetrating way, two ends of the main shaft 1 extend out of two end surfaces of the hub shell 2, and two extending ends of the main shaft 1 are used for mounting a frame; in this embodiment, the planetary gear transmission mechanism 3, also called as planetary gear reduction mechanism, comprises a sun gear 301, a planetary gear carrier 300 and a plurality of planetary gears 302 rotatably connected to the planetary gear carrier 300, wherein the sun gear 301 of the planetary gear transmission mechanism 3 is rotatably connected to the main shaft 1 and connected to the rotor 4, and the planetary gears 302 of the planetary gear transmission mechanism 3 are in transmission connection with the inside of the hub shell 2; specifically, the hub shell 2 is rotatably connected with the main shaft 1 through a bearing, and a toothed ring 303 is connected in the hub shell 2 along the circumferential direction; the planet wheel 302 of the planet gear transmission mechanism 3 is meshed with the toothed ring 303 for transmission; an end cap 200 is connected to one end of the hub shell 2, the end cap 200 is connected to a base 6, and the base 6 is rotatably connected to the main shaft 1 through a bearing. Therefore, after the stator winding 400 is electrified, the rotor 4 rotates around the axis of the main shaft 1, the rotor 4 drives the sun gear 301 to synchronously rotate, and the sun gear 301 drives the hub shell 2 to rotate through the planet gears 302.

In the present embodiment, the main shaft 1 includes a first shaft 100 and a second shaft 101 coaxially disposed, as shown in fig. 1, 2 and 3, a first end of the first shaft 100 is disposed within the hub shell 2, and a first end of the first shaft 100 is provided with a first connection portion; the first end of the second shaft 101 is arranged in the hub shell 2, the second shaft 101 is provided with a mounting part 105 for mounting the sun gear 301 near the first end, and the first end of the second shaft 101 is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected; in this embodiment, the second end of the first shaft 100 and the second end of the second shaft 101 are both disposed outside the hub shell 2 for frame mounting; the hub shell 2 is rotatably connected with the first shaft 100 through a first bearing 5, and the base 6 is rotatably connected with the second shaft 101 through a second bearing 500; the planet carrier 300 is fixedly connected at a first end of the first shaft 100 and the stator winding 400 is connected to the second shaft 101.

In the present embodiment, as shown in fig. 1, 2 and 3, the in-wheel motor sets the spindle 1 in two stages, that is, divides the spindle 1 into a first shaft 100 and a second shaft 101, and the first shaft 100 and the second shaft 101 are coaxially disposed, and the first shaft 100 and the second shaft 101 achieve splicing and separation of the spindle 1 through the detachable connection of the first connection portion and the second connection portion; when the sun gear 301 of the planetary gear transmission mechanism 3 is installed, the first shaft 100 and the second shaft 101 can be separated first, and after the sun gear 301 is installed, the first shaft 100 and the second shaft 101 are coaxially connected; so that the installation of the sun gear 301 is not limited by the diameter of the whole main shaft 1, the outer diameter of the installation part 105 on the second shaft 101 can be reduced, the diameter of the sun gear 301 is reduced, the number of teeth of the sun gear 301 is reduced, and the speed ratio or the transmission ratio of the planetary gear transmission mechanism 3 is increased; compared with the hub motor of the related art, under the condition that the speed ratio or the transmission ratio of the planetary gear transmission mechanism 3 is the same, the volume or the size of the hub shell 2 can be reduced due to the reduction of the number of teeth or the diameter of the sun gear 301, so that the whole structure of the hub motor is more compact and the whole volume is more miniaturized; further, in comparison with the hub motor of the related art, in the case where the volume or the size of the hub shell 2 is the same, the number of teeth or the diameter of the sun gear 301 is reduced, so that the output torque of the hub motor is large and the rotational speed provided is high. Secondly, the first shaft 100 and the second shaft 101 which are divided into two sections of the main shaft 1 are connected together, so that the supporting strength of the whole main shaft 1 is improved, and the lifting of the output torque of the hub motor can be effectively ensured or adapted; moreover, when the hub motor is assembled, because the first shaft 100 and the second shaft 101 are coaxially connected, that is, after the first shaft 100 and the second shaft 101 are connected, the axes of the first shaft 100 and the second shaft 101 are coincident or have a common axis, so that the concentricity between the first shaft 100 and the second shaft 101 does not need to be checked or adjusted, compared with the hub motor in the related art, the hub motor has lower requirements on the machining precision of parts, and has simple and convenient assembly process and higher production efficiency.

It will be appreciated that the speed ratio or gear ratio is equal to the ratio of the rotational speed of the output wheel to the rotational speed of the input wheel, and in this embodiment, the outer diameter of the sun gear 301, that is, the number of teeth of the sun gear 301, is reduced by reducing the outer diameter of the mounting portion 105 of the second shaft 101, so that the overall size of the sun gear 301 is reduced, and similarly, the outer diameter of the planet wheel 302 engaged with the sun gear 301 can also be reduced, so that the volume or size of the hub shell can be reduced, and the structure in the hub shell is more compact.

In this embodiment, the first connection portion of the first shaft 100 is detachably connected to the second connection portion of the second shaft 101, and in this embodiment, as shown in fig. 1 and 3, a section of threaded hole 102 is formed on the end surface of the first end of the first shaft 100 along the axial direction in a concave manner, and the threaded hole 102 forms the first connection portion; a first end of the second shaft 101 is axially connected with a threaded column 103, and the threaded column 103 forms a second connection part; the threaded post 103 is threadedly coupled to the threaded bore 102. Namely, the first shaft 100 and the second shaft 101 are spliced or separated through the threaded connection of the threaded hole 102 and the threaded column 103, and the connecting structure is simple and convenient to install.

In some embodiments, in order to improve the connection firmness between the first shaft 100 and the second shaft 101, a socket 104 into which the mounting portion 105 is partially inserted is formed between the threaded hole 102 and the end surface of the first end of the first shaft 100, as shown in fig. 1, after the first shaft 100 and the second shaft 101 are connected, a portion of the mounting portion 105 near one side of the threaded post 103 is received in the socket 104, so that the connection firmness between the first shaft 100 and the second shaft 101 is improved, and concentricity between the first shaft 100 and the second shaft 101 is effectively ensured.

As is well known, the threaded hole 102 is formed in the center of the first end face of the first shaft 100, the threaded post 103 is located in the center of the first end face of the second shaft 101, and a steel rod is integrally formed between the threaded post 103 and the mounting portion 105 of the second shaft 101.

In some embodiments, in order to further improve concentricity of the first shaft 100 and the second shaft 101 after connection and stability and firmness of the first shaft 100 and the second shaft 101 after connection, as shown in fig. 3 or fig. 1, a first annular step 106 is formed between the insertion hole 104 and the threaded hole 102, a second annular step 107 is formed between the threaded post 103 and the mounting portion 105, and after the threaded post 103 of the second shaft 101 is connected with the threaded hole 102 of the first shaft 100, the second annular step 107 is tightly attached to the first annular step 106. The first annular step 106 and the second annular step 107 are both planar, and after the first annular step 106 and the second annular step are attached, the stability and the firmness of the first shaft 100 and the second shaft 101 after being connected can be improved, and the rotation gap between threads can be effectively compensated, so that the concentricity of the first shaft 100 and the second shaft 101 after being connected can be ensured.

In the above embodiment, the first end of the first shaft 100 is provided with the radially outwardly protruding annular boss 110, and the end of the mounting portion 105 remote from the first shaft 100 is formed with the limit step 111 on the second shaft 101, as shown in fig. 3, when the second shaft 101 is connected to the first shaft 100, the annular boss 110 and the limit step 111 form an axial limit structure that limits the axial movement of the sun gear 301. In this embodiment, the mounting portion 105 is formed by cutting on the second shaft 101, the outer diameter of the mounting portion 105 is smaller than the outer diameter of the second shaft 101, the annular boss 110 and the first shaft 100 are integrally formed, and the annular boss 110 and the limiting step 111 form a mounting space for mounting the sun gear 301 after the first shaft 100 and the second shaft 101 are assembled, so that a limiting snap ring, a blocking piece, etc. are not required to be provided on the first shaft 100 to limit the mounting space for mounting the sun gear 301, and therefore, the main shaft 1 has a simple structure and is convenient to mount.

In some embodiments, as shown in fig. 1 and fig. 4, in order to further improve the connection firmness of the first shaft 100 and the second shaft 101, so that the main shaft 1 as a whole can adapt to or bear larger output torque, a first pin hole 109 is radially arranged at a first end of the first shaft 100, and a second pin hole 108 is radially arranged at a first end of the second shaft 101; after the second shaft 101 is connected to the first shaft 100, the second pin hole 108 coincides with the first pin hole 109, and a pin shaft for preventing the first shaft 100 and the second shaft 101 from rotating relative to each other is connected to the second pin hole 108 and the first pin hole 109. That is, after the first shaft 100 and the second shaft 101 are connected, the first pin hole 109 and the second pin hole 108 are overlapped, and then the pin shaft is inserted into and tightly fitted in the first pin hole 109 and the second pin hole 108, so that the first shaft 100 and the second shaft 101 are connected more firmly, and the first shaft 100 and the second shaft 101 can be prevented from rotating relatively.

Another embodiment of the application discloses a hub motor, which structurally comprises a main shaft 1, a hub shell 2, a stator winding 400, a rotor 4 and a planetary gear transmission mechanism 3, wherein a sun gear 301 of the planetary gear transmission mechanism 3 is rotatably connected to the main shaft 1 and is connected with the rotor 4, and a planet gear 302 of the planetary gear transmission mechanism 3 is in transmission connection with the hub shell 2; the main shaft 1 comprises a first shaft 100 and a second shaft 101 which are coaxially arranged, wherein a first end of the first shaft 100 is arranged in the hub shell 2, and a first connecting part is arranged at a first end of the first shaft 100; the first end of the second shaft 101 is arranged in the hub shell 2, the second shaft 101 is provided with a mounting part 105 for mounting the sun gear 301 near the first end, and the first end of the second shaft 101 is provided with a second connecting part; the first connecting part is detachably connected with the second connecting part; the second end of the first axle 100 and the second end of the second axle 101 are both disposed outside the hub shell 2 for frame mounting; a section of threaded hole 102 is formed on the end surface of the first end of the second shaft 101 in an axially inward concave manner, and the threaded hole 102 forms the second connecting part; a first end of the first shaft 100 is axially connected with a threaded post 103, the threaded post 103 forming the first connection; a threaded post 103 is threadedly coupled to the threaded bore 102.

In the above-described embodiment, the screw post 103 is provided at the first end of the first shaft 100 and the screw hole 102 is provided at the first end of the second shaft 101, and in this embodiment, assembly and separation of the first shaft 100 and the second shaft 101 can be also achieved. Other technical means of the present embodiment are the same as those of the foregoing embodiments, so a description thereof will not be repeated.

Another embodiment of the application discloses a hub motor, which structurally comprises a main shaft 1, a hub shell 2, a stator winding 400, a rotor 4 and a planetary gear transmission mechanism 3, wherein a sun gear 301 of the planetary gear transmission mechanism 3 is rotatably connected to the main shaft 1 and is connected with the rotor 4, and a planet gear 302 of the planetary gear transmission mechanism 3 is in transmission connection with the hub shell 2; the main shaft 1 comprises a first shaft 100 and a second shaft 101 which are coaxially arranged, wherein a first end of the first shaft 100 is arranged in the hub shell 2, and a first connecting part is arranged at a first end of the first shaft 100; a first end of the second shaft 101 is arranged in the hub shell 2, a mounting part 105 for mounting the sun gear 301 is arranged at the position, close to the first end, of the second shaft 101, and a second connecting part is arranged at the first end of the second shaft 101; the first connecting part and the second connecting part are detachably connected; the second end of the first shaft 100 and the second end of the second shaft 101 are both arranged outside the hub shell 2 and used for frame installation; a coaxial connector 114 is disposed between the first shaft 100 and the second shaft 101, one end of the coaxial connector 114 is connected to the first end of the first shaft 100, and the other end of the coaxial connector 114 is connected to the first end of the second shaft 101. In this embodiment, for the detachable connection between the first shaft 100 and the second shaft 101, connection or disconnection may be performed by means of the coaxial connector 114, as in the structure described in fig. 7. In connection, it is only necessary to connect both ends of the coaxial connector 114 to the first shaft 100 and the second shaft 101, respectively. Other technical means of the present embodiment are the same as those of the foregoing embodiments, so a description thereof will not be repeated.

Another embodiment of the present application discloses a hub motor, as shown in fig. 5 and 6, the structure of the hub motor includes a main shaft 1, a hub shell 2, a stator winding 400, a rotor 4 and a planetary gear transmission mechanism 3, wherein a sun gear 301 of the planetary gear transmission mechanism 3 is rotatably connected to the main shaft 1 and connected to the rotor 4, and a planet gear 302 of the planetary gear transmission mechanism 3 is in transmission connection with the hub shell 2; the main shaft 1 comprises a first shaft 100 and a second shaft 101 which are coaxially arranged, wherein a first end of the first shaft 100 is arranged in the hub shell 2, and a first connecting part is arranged at a first end of the first shaft 100; a first end of the second shaft 101 is arranged in the hub shell 2, a mounting part 105 for mounting the sun gear 301 is arranged at the position, close to the first end, of the second shaft 101, and a second connecting part is arranged at the first end of the second shaft 101; the first connecting part is detachably connected with the second connecting part; the second end of the first axle 100 and the second end of the second axle 101 are both disposed outside the hub shell 2 for frame mounting; the end face of the first end of the first shaft 100 is concavely provided with a plug hole 113 along the axial direction, and the plug hole 113 forms a first connecting part; the first end of the first shaft 100 is axially connected with a plug-in post 112, and the plug-in post 112 forms a second connection part; the plug-in posts 112 are plugged into the plug-in holes 113.

In the above embodiment, the first shaft 100 and the second shaft 101 of the spindle 1 of the hub motor are connected by means of plug-in fit, in this embodiment, the plug-in hole 113 may be a round hole, or may be a special-shaped hole, such as a cross-shaped hole, a D-shaped hole, a square hole, etc., while the cross-sectional shape of the plug-in post 112 is adapted to the cross-sectional shape of the plug-in hole 113, the fit between the plug-in post 112 and the plug-in hole 113 is preferably set to be tight fit, and the two may be fixed by means of a radial limiting pin, so as to ensure that after the spindle 1 is installed, no relative rotation occurs between the first shaft 100 and the second shaft 101. Likewise, in order to make the connection between the first shaft 100 and the second shaft 101 stronger and to better ensure the concentricity of the first shaft 100 and the second shaft 101, as shown in fig. 6, the plugging post 112 may be configured as a frustum with a small outer end and a large inner end, and the inner wall of the plugging hole 113 is configured as a tapered hole adapted thereto. Other technical means of the present embodiment are the same as those of the foregoing embodiments, so a description thereof will not be repeated.

In the description of the embodiments of the present application, it should be noted that, in the description of the present application, terms such as "inner", "outer", and the like, refer to directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or components must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present application.

In the description of the present application, the descriptions of the terms "one embodiment," "some embodiments," "in this embodiment," "specific examples," or "some examples," etc., mean that a particular feature, mechanism, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, mechanisms, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (10)

1. The hub motor comprises a main shaft, a hub shell, a stator winding, a rotor and a planetary gear transmission mechanism, wherein a sun gear of the planetary gear transmission mechanism is rotatably connected to the main shaft and connected with the rotor, and a planet gear of the planetary gear transmission mechanism is in transmission connection with the hub shell; the method is characterized in that: the main shaft comprises a first shaft and a second shaft which are coaxially arranged, the first end of the first shaft is arranged in the hub shell, and a first connecting part is arranged at the first end of the first shaft; the first end of the second shaft is arranged in the hub shell, the position, close to the first end, of the second shaft is provided with a mounting part for mounting the sun gear, and the first end of the second shaft is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected; the second end of the first shaft and the second end of the second shaft are both disposed outside the hub shell and are configured for frame installation.

2. The in-wheel motor according to claim 1, wherein: the end face of the first end of the first shaft is concavely provided with a section of threaded hole along the axial direction, and the threaded hole forms the first connecting part; a first end of the second shaft is axially connected with a threaded column, and the threaded column forms the second connecting part; the threaded column is in threaded connection with the threaded hole.

3. The in-wheel motor according to claim 2, wherein: an insertion hole into which the mounting portion is partially inserted is formed between the screw hole and an end surface of the first end of the first shaft.

4. The in-wheel motor according to claim 3, wherein: the jack with be formed with first annular step between the screw hole, the screw thread post with be formed with the second annular step between the installation department, the screw thread post of second shaft with after the screw hole of first shaft is connected, the second annular step with first annular step is closely laminated.

5. The in-wheel motor according to claim 1, wherein: the first end of the first shaft is provided with a radial outwards protruding annular boss, one end of the mounting part, which is far away from the first shaft, is provided with a limiting step on the second shaft, and when the second shaft is connected to the first shaft, the annular boss and the limiting step form a mounting space for mounting the sun gear.

6. The in-wheel motor according to any one of claims 1 to 5, wherein: the first end of the first shaft is provided with a first pin hole along the radial direction, and the first end of the second shaft is provided with a second pin hole along the radial direction; after the second shaft is connected with the first shaft, the second pin hole is overlapped with the first pin hole, and a pin shaft for preventing the first shaft and the second shaft from rotating relatively is connected in the second pin hole and the first pin hole.

7. The in-wheel motor according to claim 1, wherein: the hub shell is rotatably connected with the first shaft through a first bearing, and a toothed ring is arranged in the hub shell along the circumferential direction; the planet wheel of the planetary gear transmission mechanism is meshed with the toothed ring for transmission; one end of the hub shell is connected with an end cover, the end cover is connected with the base, and the base is rotatably connected with the second shaft through a second bearing.

8. The hub motor comprises a main shaft, a hub shell, a stator winding, a rotor and a planetary gear transmission mechanism, wherein a sun gear of the planetary gear transmission mechanism is rotatably connected to the main shaft and connected with the rotor, and a planet gear of the planetary gear transmission mechanism is in transmission connection with the hub shell; the method is characterized in that: the main shaft comprises a first shaft and a second shaft which are coaxially arranged, the first end of the first shaft is arranged in the hub shell, and a first connecting part is arranged at the first end of the first shaft; the first end of the second shaft is arranged in the hub shell, the position, close to the first end, of the second shaft is provided with a mounting part for mounting the sun gear, and the first end of the second shaft is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected; the second end of the first shaft and the second end of the second shaft are both arranged outside the hub shell and are used for mounting a frame; the end face of the first end of the second shaft is concavely provided with a section of threaded hole along the axial direction, and the threaded hole forms the second connecting part; a first end of the first shaft is axially connected with a threaded column, and the threaded column forms the first connecting part; the threaded column is in threaded connection with the threaded hole.

9. The hub motor comprises a main shaft, a hub shell, a stator winding, a rotor and a planetary gear transmission mechanism, wherein a sun gear of the planetary gear transmission mechanism is rotatably connected to the main shaft and connected with the rotor, and a planet gear of the planetary gear transmission mechanism is in transmission connection with the hub shell; the method is characterized in that: the main shaft comprises a first shaft and a second shaft which are coaxially arranged, the first end of the first shaft is arranged in the hub shell, and a first connecting part is arranged at the first end of the first shaft; the first end of the second shaft is arranged in the hub shell, the position, close to the first end, of the second shaft is provided with a mounting part for mounting the sun gear, and the first end of the second shaft is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected; the second end of the first shaft and the second end of the second shaft are both arranged outside the hub shell and are used for mounting a frame; and a coaxial connector is arranged between the first shaft and the second shaft, one end of the coaxial connector is connected with the first end of the first shaft, and the other end of the coaxial connector is connected with the first end of the second shaft.

10. The hub motor comprises a main shaft, a hub shell, a stator winding, a rotor and a planetary gear transmission mechanism, wherein a sun gear of the planetary gear transmission mechanism is rotatably connected to the main shaft and connected with the rotor, and a planet gear of the planetary gear transmission mechanism is in transmission connection with the hub shell; the method is characterized in that: the main shaft comprises a first shaft and a second shaft which are coaxially arranged, the first end of the first shaft is arranged in the hub shell, and a first connecting part is arranged at the first end of the first shaft; the first end of the second shaft is arranged in the hub shell, the position, close to the first end, of the second shaft is provided with a mounting part for mounting the sun gear, and the first end of the second shaft is provided with a second connecting part; the first connecting part and the second connecting part are detachably connected; the second end of the first shaft and the second end of the second shaft are both arranged outside the hub shell and are used for mounting a frame; an end face of the first end of the first shaft is concavely provided with a plug hole along the axial direction, and the plug hole forms the first connecting part; the first end of the first shaft is axially connected with a plug-in column, and the plug-in column forms the second connecting part; the plug-in column is in plug-in fit with the plug-in hole.