CN219041595U - Rim motor and electric automobile - Google Patents

Abstract

The utility model relates to the technical field of electric automobile transmission, and provides a rim motor and an electric automobile. The fixed shaft is inserted into the rim from the front end cover along the axis of the rim and is rotationally connected with the front end cover and the rear end cover; the inner gear ring is fixed with the rim main body; the double-rotor motor is arranged in the accommodating space and is in meshed transmission with the annular gear through the planetary gear train, the double-rotor motor comprises a rotor assembly and a stator assembly, the rotor assembly comprises an inner rotor and an outer rotor, permanent magnets are respectively attached to the inner rotor and the outer rotor, the inner rotor is fixedly connected with the sun gear, the stator assembly is positioned between the inner rotor and the outer rotor, and the stator assembly is fixedly connected with the fixed shaft through a fixing plate. Through the design, the rim is driven by the double-rotor motor, the torque density of the double-rotor motor can be greatly improved, the requirement on high-quality permanent magnet materials is reduced, the radial magnetic pulling force between the rotor and the stator can be balanced, and the stable operation of the motor is facilitated.

Description

Rim motor and electric automobile

Technical Field

The utility model relates to the technical field of electric automobile transmission, in particular to a rim motor and an electric automobile.

Background

Nowadays, an electric automobile gradually becomes the main stream direction in the automobile field, and the consumed energy is secondary energy, so that excessive consumption of primary energy is avoided.

Rim motors are a technology of arranging an electric motor for driving an automobile in a rim, and are characterized in that power, transmission and braking devices are integrated in the rim, so that mechanical parts of the electric vehicle are greatly simplified. In the case of transmissions, a reduction gear is one of the most important components, and planetary reduction gears are used as a most common reduction gear mechanism in different electric vehicles, and also in rim motors.

In a common rim motor, most of motor driving of a single rotor is performed, the effective air gap area between a stator and a rotor is small, so that the torque density is small, the torque density of the motor can be ensured only by using high-quality permanent magnet materials, and the manufacturing cost of the rim motor is consistent, high and resident.

Therefore, there is a need for a rim motor and an electric vehicle to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a rim motor and an electric automobile, which can improve torque density, thereby reducing required permanent magnet materials and manufacturing cost.

To achieve the purpose, the utility model adopts the following technical scheme:

rim motor, comprising:

a rim including a front end cover, a rear end cover, and a rim main body, the front end cover and the rear end cover being fixed to both end surfaces of the main body, respectively, an accommodating space being formed inside the rim;

a fixed shaft inserted into the rim from the front cover along an axis of the rim and rotatably connected to the front cover and the rear cover;

the planetary gear train comprises a sun gear, a planet wheel, a planet carrier and an inner gear ring, wherein the sun gear is sleeved on the fixed shaft and is rotationally connected with the fixed shaft, the sun gear is meshed with the planet wheel, the planet wheel is rotationally connected with the planet carrier, the planet carrier is fixedly connected with the fixed shaft,

the annular gear is fixed with the rim main body, and the annular gear is meshed with the planet gears;

the double-rotor motor is arranged in the accommodating space and comprises a rotor assembly and a stator assembly, wherein the rotor assembly comprises an inner rotor and an outer rotor, the inner rotor and the outer rotor are respectively stuck with permanent magnets, the inner rotor is fixedly connected with the outer rotor, the rotor assembly is fixedly connected with the sun wheel, the stator assembly is positioned between the inner rotor and the outer rotor, and the stator assembly is fixedly connected with the fixing shaft through a fixing plate.

As a preferable embodiment of the rim motor, a spigot structure is provided at a connection position of the front end cover and the rim body and a connection position of the rear end cover and the rim body.

As a preferable mode of the rim motor, the front end cover and the rear end cover are each provided with a bearing, and the bearings are disposed at intervals along the peripheral side of the fixed shaft and are rotatably connected to the fixed shaft.

As a preferable technical scheme of the rim motor, an oil seal is provided at a connection position of the front end cover and the fixed shaft.

As a preferable technical scheme of the rim motor, a bearing is interposed between the inner rotor and the fixed shaft.

As a preferable technical scheme of the rim motor, the ring gear is in interference fit with the rim body.

As a preferable embodiment of the rim motor, the ring gear is integrally formed with the rim body.

As a preferable embodiment of the rim motor, an air gap space is provided between the stator and the outer rotor and between the stator and the inner rotor.

The electric automobile comprises a frame and the rim motor, and the fixing shaft is fixedly connected with the frame.

As a preferable embodiment of the electric vehicle, a tire is fitted over the rim body.

The utility model has the beneficial effects that:

the front end cover and the rear end cover of the rim are respectively arranged on two axial end surfaces of the rim main body through bolts to form a relatively airtight accommodating space. The fixed shaft is inserted into the accommodating space from the front end cover along the axial direction of the rim and is rotationally connected with the rim. The birotor motor is arranged in the accommodating space, wherein the fixed plate is fixedly connected with the fixed shaft through a key, and the stator is fixed with the fixed plate through a fastener and then fixed with the fixed shaft. The inner rotor is fixedly connected with the outer rotor to form a U-shaped groove structure, and the stator assembly is positioned in the U-shaped groove structure and clamped between the inner rotor and the outer rotor. The double-rotor motor and the rim are driven through a planetary gear train structure, wherein the sun gear is sleeved on the fixed shaft and in interference fit with the rotor assembly, the planet carrier is fixedly connected with the fixed shaft through a key, the planet carrier and the fixed shaft are enabled to be relatively static, the planet gear is rotationally connected with the planet carrier through a pin shaft, and the sun gear is meshed with the planet gear for driving. The inner gear ring is cold-pressed and installed on the rim main body, and the inner gear ring is meshed with the planet gears for transmission. In this way, the rotor sequentially passes through the sun wheel, the planet wheel and the inner gear ring to drive, so that the transmission with the rim is realized.

When the stator assembly is electrified, the stator assembly, the inner rotor and the outer rotor form a magnetic field, so that the rotor assembly and the stator assembly rotate relatively, the stator assembly is fixed with the rim through the fixing plate, the rotor assembly rotates around the fixing shaft, the inner rotor and the outer rotor are fixedly connected, the inner rotor and the outer rotor synchronously rotate, the rotor assembly drives the sun wheel to rotate around the fixing shaft, the sun wheel drives the planet wheel to rotate, the planet carrier is fixed on the fixing shaft by the key and cannot rotate relatively to the fixing shaft, the planet wheel drives the annular gear to rotate around the fixing shaft, and the rim main body rotates along with the annular gear due to the fixed connection of the annular gear and the rim main body. When the stator assembly is powered off, the magnetic field between the stator assembly and the rotor assembly disappears, the rotor assembly stops rotating, and the planetary gear train and the rim also stop rotating along with the rotor assembly. Through the design, the rim is driven by the double-rotor motor, the torque density of the double-rotor motor can be greatly improved, the demand for high-quality permanent magnet materials is reduced, the radial magnetic pulling force between the rotor and the stator can be balanced, the stable operation of the motor is facilitated, and the stability and the safety of the rim are further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic structural view of a rim motor according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a planetary gear train according to an embodiment of the present utility model.

In the figure:

10. a front end cover; 11. a rear end cover; 12. a rim body; 13. an oil seal;

20. a fixed shaft; 21. a wire harness;

30. a sun gear; 31. a planet wheel; 32. a planet carrier; 33. an inner gear ring; 34. a fixing plate; 35. a pin shaft;

40. a rotor assembly; 41. a stator assembly; 42. permanent magnets.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1-2, the present application provides a rim motor including a rim, a stationary shaft 20, a planetary gear train, and a dual rotor motor. The rim comprises a front end cover 10, a rear end cover 11 and a rim main body 12, wherein the front end cover 10 and the rear end cover 11 are respectively fixed with two end faces of the main body, and an accommodating space is formed in the rim; the fixed shaft 20 is inserted into the rim from the front end cover 10 along the axis of the rim and is rotatably connected with the front end cover 10 and the rear end cover 11; the planetary gear train comprises a sun gear 30, a planetary gear 31, a planetary carrier 32 and an annular gear 33, wherein the sun gear 30 is sleeved on the fixed shaft 20 and is in rotary connection with the fixed shaft 20, the sun gear 30 is meshed with the planetary gear 31, the planetary gear 31 is in rotary connection with the planetary carrier 32, and the planetary carrier 32 is fixedly connected with the fixed shaft 20; the annular gear 33 is fixed with the rim body 12, and the annular gear 33 is meshed with the planet gears 31; the double-rotor motor is arranged in the accommodating space, the double-rotor motor comprises a rotor assembly 40 and a stator assembly 41, the rotor assembly 40 comprises an inner rotor and an outer rotor, permanent magnets 42 are respectively stuck to the inner rotor and the outer rotor, the inner rotor is fixedly connected with the outer rotor, the inner rotor is fixed with the sun gear 30, the stator assembly 41 is arranged between the inner rotor and the outer rotor, and the stator assembly 41 is fixed with the fixed shaft 20 through a fixed plate 34.

Specifically, the front end cover 10 and the rear end cover 11 of the rim are respectively mounted on two axial end surfaces of the rim body 12 by bolts, so as to form a relatively airtight accommodating space. The fixed shaft 20 is inserted into the accommodating space from the front cover 10 along the axial direction of the rim, and is rotatably connected with the rim. The dual rotor motor is installed in the accommodating space, wherein the fixing plate 34 is fixedly connected with the fixing shaft 20 through a key, and the stator is fixed with the fixing plate 34 through a fastener and then fixed with the fixing shaft 20. The inner rotor is fixedly connected with the outer rotor to form a U-shaped groove structure, and the stator assembly 41 is positioned in the U-shaped groove structure and is clamped between the inner rotor and the outer rotor. The dual-rotor motor and the rim are driven through a planetary gear train structure, wherein a sun gear 30 is sleeved on the fixed shaft 20 and in interference fit with the rotor assembly 40, the planet carrier 32 is fixedly connected with the fixed shaft 20 through a key, the planet carrier 32 and the fixed shaft 20 are enabled to be relatively static, the planet wheel 31 is rotationally connected with the planet carrier 32 through a pin shaft 35, and the sun gear 30 is meshed with the planet wheel 31 for driving. The inner gear ring 33 is cold-pressed and installed on the rim main body 12, and the inner gear ring 33 is meshed with the planet gears 31 for transmission. In this way, the rotor is driven by the sun gear 30, the planet gears 31 and the inner gear ring 33 in sequence, so that the transmission with the rim is realized.

The stationary shaft 20 is provided with a hole structure or a slot structure so that the motor harness 21 can be connected to a control module for controlling the on/off state of the stator assembly 41 through the stationary shaft 20. When the stator assembly 41 is electrified, the stator assembly 41, the inner rotor and the outer rotor form a magnetic field, so that the rotor assembly 40 and the stator assembly 41 rotate relatively, wherein the stator assembly 41 is fixed with the rim through the fixing plate 34, the rotor assembly 40 rotates around the fixed shaft 20, and the inner rotor and the outer rotor synchronously rotate because the inner rotor is fixedly connected with the outer rotor, the rotor assembly 40 drives the sun wheel 30 to rotate around the fixed shaft 20, the sun wheel 30 drives the planet wheel 31 to rotate, the planet carrier 32 is fixed on the fixed shaft 20 through keys and cannot rotate relative to the fixed shaft 20, the planet wheel 31 drives the inner gear ring 33 to rotate around the fixed shaft 20, and the rim main body 12 rotates along with the inner gear ring 33 because the inner gear ring 33 is fixedly connected with the rim main body 12. When the stator assembly 41 is powered off, the magnetic field between the stator assembly 41 and the rotor assembly 40 is removed, the rotor assembly 40 stops rotating, and the planetary gear train and the rim stop rotating accordingly.

Through the design, the rim is driven by the double-rotor motor, the torque density of the double-rotor motor can be greatly improved, the radial magnetic tension between the rotor and the stator can be balanced, the stable operation of the motor is facilitated, and the stability and the safety of the rim are further improved.

Optionally, the connection position of the front end cover 10 and the rim body 12 and the connection position of the rear end cover 11 and the rim body 12 are both provided with spigot structures. Specifically, the end cap is provided with a male spigot, and the end face of the rim body 12 is provided with a female spigot. This design ensures that the front end cap 10 and the rear end cap 11 are coaxially aligned with the rim body 12.

Optionally, the front end cover 10 and the rear end cover 11 are both provided with bearings, which are disposed at intervals along the peripheral side of the fixed shaft 20 and are rotatably connected with the fixed shaft 20. By this arrangement, when the rim and the fixed shaft 20 are rotated relatively, frictional resistance between the both end surfaces and the fixed shaft 20 is reduced.

Optionally, an oil seal 13 is disposed at a connection position of the front end cover 10 and the fixed shaft 20. So the design can dust seal, prevents outside dust debris through the oil blanket 13 structure and gets into the accommodation space from the gap of front end housing 10 and fixed axle 20 junction in, because install birotor motor in the accommodation space, under the adsorption of static, dust debris can concentrate to adhere to the birotor motor, influences the use.

Optionally, a bearing is interposed between the rotor assembly 40 and the stationary shaft 20. Specifically, a needle bearing may be used to support the rotor assembly 40 and the fixed shaft 20, so as to reduce rotational friction between the rotor assembly 40 and the fixed shaft 20.

In other embodiments, other bearings may be used, if space size permits.

Optionally, the ring gear 33 is interference fit with the rim body 12. So designed that the ring gear 33 is fixed with the rim.

Alternatively, the ring gear 33 is integrally formed with the rim body 12. By the design, the rim and the annular gear 33 can synchronously rotate, the mounting structure is simplified, and the stability is improved.

Optionally, air gap spaces are provided between the stator and the outer rotor and between the stator and the inner rotor. By the design, the effective air gap area of the motor is increased through the double-air-gap structure, and the torque density is further improved.

The application also provides an electric automobile, including frame and foretell rim motor, fixed axle 20 and frame fixed connection. The design is such that the stator assembly 41, which is connected to the stationary shaft 20 by the stationary plate 34, can be kept relatively stationary and not rotated.

Alternatively, the tire is fitted over the rim body 12.

Furthermore, the foregoing description of the preferred embodiments and the principles of the utility model is provided herein. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. Rim motor, its characterized in that includes:

the rim comprises a front end cover (10), a rear end cover (11) and a rim main body (12), wherein the front end cover (10) and the rear end cover (11) are respectively fixed with two end faces of the main body, and a containing space is formed in the rim;

a fixed shaft (20), wherein the fixed shaft (20) is inserted into the rim from the front end cover (10) along the axis of the rim, and is rotationally connected with the front end cover (10) and the rear end cover (11);

the planetary gear system comprises a sun gear (30), a planet wheel (31), a planet carrier (32) and an inner gear ring (33), wherein the sun gear (30) is sleeved on the fixed shaft (20) and is rotationally connected with the fixed shaft (20), the sun gear (30) is meshed with the planet wheel (31), the planet wheel (31) is rotationally connected with the planet carrier (32), the planet carrier (32) is fixedly connected with the fixed shaft (20),

the inner gear ring (33) is fixed with the rim main body (12), and the inner gear ring (33) is meshed with the planet gears (31);

the double-rotor motor is arranged in the accommodating space and comprises a rotor assembly (40) and a stator assembly (41), the rotor assembly (40) comprises an inner rotor and an outer rotor, the inner rotor and the outer rotor are respectively stuck with a permanent magnet (42), the inner rotor is fixedly connected with the outer rotor, the rotor assembly (40) is fixedly connected with the sun gear (30), the stator assembly (41) is located between the inner rotor and the outer rotor, and the stator assembly (41) is fixedly connected with the fixing shaft (20) through a fixing plate (34).

2. Rim motor according to claim 1, characterized in that the connection of the front end cap (10) to the rim body (12) and the connection of the rear end cap (11) to the rim body (12) are provided with spigot structures.

3. Rim motor according to claim 1, characterized in that the front end cap (10) and the rear end cap (11) are each provided with bearings which are arranged at intervals along the peripheral side of the stationary shaft (20) and are rotatably connected with the stationary shaft (20).

4. Rim motor according to claim 1, characterized in that the connection of the front end cap (10) to the stationary shaft (20) is provided with an oil seal (13).

5. Rim motor according to claim 1, characterized in that a bearing is interposed between the inner rotor and the fixed shaft (20).

6. Rim motor according to claim 1, characterized in that the ring gear (33) is interference fitted with the rim body (12).

7. Rim motor according to claim 1, characterized in that the ring gear (33) is integrally formed with the rim body (12).

8. The rim motor of claim 1, wherein an air gap space is provided between the stator and the outer rotor and between the stator and the inner rotor.

9. An electric vehicle, characterized by comprising a frame and a rim motor according to any one of claims 1-8, said stationary shaft (20) being fixedly connected to said frame.

10. The electric vehicle according to claim 9, characterized in that a tyre is fitted over the rim body (12).

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