Four-gear new energy automobile hub motor driving device and speed regulation method

Abstract

The invention discloses a four-gear new energy automobile hub motor driving device and a speed regulation method. The hub motor driving device comprises a motor, a shell, a first brake, a first-stage planetary gear train, a synchronizer, a second brake, a third brake, a fourth brake, a second-stage planetary gear train, a double clutch, a first shaft, a second shaft and a hub. The synchronizer is located in the rotation space of the special-shaped gear ring, the first shaft is an input shaft of the first-stage planetary gear train, and the second shaft is an input shaft of the second-stage planetary gear train. The second combined gear ring is connected with the special-shaped gear ring, and the first combined gear ring is connected with the first-stage planet carrier; through axial movement of the combination sleeve, the second shaft can be combined with the first-stage planet carrier or the special-shaped gear ring, the first-stage planet carrier and the special-shaped gear ring can transmit power to the second-stage sun gear, input of two rotating speeds of the second-stage sun gear is achieved, and through matching of two-stage input and two-stage output of the second-stage planet gear train, the four-gear speed regulation effect is achieved. According to the invention, the output torque can be increased, and more stable output power and speed regulation of more gears can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a four-speed new energy vehicle hub motor driving device and a speed regulation method. Background Art

[0002] New energy vehicles have attracted widespread attention from researchers and developers due to their zero emissions and high energy efficiency. The wheel hub motor drive system of new energy vehicles is usually divided into two forms: direct drive and reducer drive, of which reducer drive is more common. The wheel hub motor reducer is an important transmission device integrated in the wheel hub, which is used to convert the high-speed rotation of the motor into the low-speed and high-torque output required by the wheel. Most of the current wheel hub motor reducers use a single-row planetary gear structure, which has limited torque conversion, and most wheel hub motors cannot achieve speed regulation through the reducer structure, but can only achieve variable speed output through motor speed regulation. This speed change method causes the output power of the motor to be unstable to a certain extent.

[0003] For example, the Chinese invention patent with publication number CN116605042A discloses a double-row planetary gear reducer, which uses a two-stage planetary gear system. The motor rotor is input to the first-stage sun gear, then output to the second-stage sun gear by the first-stage planet carrier, and finally output by the second-stage planet carrier, achieving two decelerations and torque increases. However, the reducer has a fixed transmission ratio and cannot achieve speed change through the reducer structure.

[0004] The Chinese invention patent with publication number CN106394213A discloses a two-speed hub motor reducer, which is a two-speed hub motor reducer that symmetrically installs two planetary gear trains with different transmission ratios on both sides of the motor. The motor rotor can be combined with the sun gears of the two planetary gear trains respectively, and then output from the planet carrier to the hub to achieve two-speed speed regulation. However, the reducer can only achieve two-speed speed regulation, and the two gears only achieve one deceleration and torque increase. Since the two planetary gear trains have no cooperative relationship, the two planetary gear trains are not fully utilized and cannot generate greater output torque and more speed regulation gears. Summary of the invention

[0005] The object of the present invention is to provide a four-speed new energy vehicle hub motor drive device and a speed regulation method to increase the output torque and achieve more stable output power and speed regulation with more gears.

[0006] One aspect of the present invention provides a four-speed new energy vehicle wheel hub motor drive device, comprising a motor, a housing, a brake 1, a primary planetary gear train, a synchronizer, a brake 2, a brake 3, a brake 4, a secondary planetary gear train, a dual clutch, a shaft 1, a shaft 2, and a wheel hub; The primary planetary gear train includes a primary planet carrier, three evenly distributed primary planetary gears, a primary sun gear and a special-shaped ring gear; The synchronizer includes a lock ring, a first combined gear ring, a combined sleeve, a slider, a second combined gear ring, a spring ring, and a spline hub; The secondary planetary gear train includes a secondary ring gear, a secondary sun gear, three evenly distributed secondary planetary gears, and a secondary planet carrier; The dual clutch includes a first clutch, a second clutch and a flywheel; The synchronizer is located in the rotation space of the special-shaped gear ring. The first shaft is the input shaft of the primary planetary gear train, and the second shaft is the input shaft of the secondary planetary gear train. The second combined gear ring is connected to the special-shaped gear ring, and the first combined gear ring is connected to the primary planet carrier. Through the axial movement of the coupling sleeve, shaft two can be combined with the primary planetary carrier or the special-shaped ring gear. The primary planetary carrier and the special-shaped ring gear can respectively transmit power to the secondary sun gear, thereby realizing two speed inputs of the secondary sun gear. Through the combination of the two-stage input and output of the secondary planetary gear system, a four-speed speed regulation effect can be achieved.

[0007] Another aspect of the present invention provides a speed regulation method for a four-speed new energy vehicle wheel hub motor drive device, comprising: When the coupling sleeve moves axially and moves toward the first coupling ring gear, only the power of the first-stage planetary carrier in the first-stage planetary gear train can be transmitted to the second shaft through the synchronizer, and then the second shaft inputs the power into the second-stage planetary gear train; When the coupling sleeve moves axially and moves toward the second coupling ring gear, only the power of the special-shaped ring gear in the first-stage planetary gear train can be transmitted to the second shaft through the synchronizer, and then the second shaft inputs the power into the second-stage planetary gear train; The secondary planetary carrier and the secondary ring gear can be combined with the flywheel of the dual clutch through the second clutch and the first clutch respectively to achieve two speed outputs. Through the combination of the two speed input and output of the secondary planetary gear system, a four-speed speed regulation effect can be achieved.

[0008] The four-speed new energy vehicle wheel hub motor driving device and speed regulation method provided by the present invention have the following beneficial effects: 1. In the transmission part, the synchronizer is installed inside the primary planetary gear train, and the input end of the dual clutch can be directly installed on the secondary planetary gear train, which can reduce the space occupied by the dual clutch, make the overall structure compact, and realize the integrated design of the wheel; 2. The wheel hub motor drive device has a simple structure and can achieve four-speed speed regulation. The invention uses the deceleration effect of the planetary gear train, and can achieve double deceleration and torque increase in each gear through a two-stage planetary gear train, so that the final output torque is maximized, and the four-speed speed regulation can be achieved only by switching the synchronizer and cooperating with the corresponding brake; 3. The present invention achieves a speed regulation effect through structural design, that is, the motor can achieve multi-gear output while maintaining the speed or power unchanged, which enables the motor to work in a stable state and reduce power loss; 4. Compared with other planetary gear transmission mechanisms that only use the planet carrier as the output, the present invention uses the special-shaped ring gear and the secondary ring gear as the output part, so that the planetary gear system is more fully utilized, and can generate a larger output torque and more speed gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is an exploded schematic diagram of the four-speed new energy vehicle wheel hub motor drive device of the present invention; Figure 2 It is a cross-sectional schematic diagram of the transmission part of the four-speed new energy vehicle wheel hub motor drive device of the present invention; Figure 3 is a cross-sectional schematic diagram of a synchronizer; Figure 4 This is a schematic diagram of the structure of the first-stage planetary gear train from the first perspective; Figure 5 This is a schematic diagram of the structure of the first-stage planetary gear train from the second perspective; Figure 6 It is a structural diagram of the secondary planetary gear train; Figure 7 It is a schematic diagram of the structure of a dual clutch; Figure 8 is a partial cross-sectional schematic diagram of a dual clutch; Fig. 9 It is a schematic diagram of the power flow in the first gear; Fig.10 It is a schematic diagram of the power flow in the second gear; Fig.11 It is a schematic diagram of the power flow in three gears; Fig.12 This is a schematic diagram of the power flow in four gears. DETAILED DESCRIPTION

[0010] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0011] See also Figures 1 to 8The four-speed new energy vehicle wheel hub motor driving device provided by the embodiment of the present invention includes a motor 1, a housing 2, a brake 1 3, a primary planetary gear train 4, a synchronizer 5, a brake 2 6, a brake 3 7, a brake 4 8, a secondary planetary gear train 9, a dual clutch 10, a shaft 1 11, a shaft 2 12, and a wheel hub 13.

[0012] The primary planetary gear train 4 includes a primary planet carrier 401 , three evenly distributed primary planetary gears 402 , a primary sun gear 403 and a special-shaped ring gear 404 .

[0013] The synchronizer 5 includes a lock ring 501 , a first combined gear ring 502 , a combined sleeve 503 , a slider 504 , a second combined gear ring 505 , a spring ring 506 , and a spline hub 507 .

[0014] The secondary planetary gear train 9 includes a secondary ring gear 901 , a secondary sun gear 902 , three evenly distributed secondary planetary gears 903 , and a secondary planet carrier 904 .

[0015] The double clutch 10 includes a first clutch 1001 , a second clutch 1002 and a flywheel 1003 .

[0016] The flywheel 1003 is connected to the hub 13 via bolts, and the housing 2 is connected to the motor 1 via bolts.

[0017] Please refer to Figure 2 The transmission part of the wheel hub motor drive device includes shaft 11, brake 13, primary planetary gear train 4, synchronizer 5, shaft 2 12, brake 2 6, brake 3 7, brake 4 8, secondary planetary gear train 9, first clutch 1001, and second clutch 1002. The synchronizer 5 is located in the rotation space of the special-shaped gear ring 404, shaft 11 is the input shaft of the primary planetary gear train 4, and shaft 2 12 is the input shaft of the secondary planetary gear train 9. Shaft 11, primary sun gear 403, primary planet carrier 401, special-shaped gear ring 404, synchronizer 5, shaft 2 12, and secondary sun gear 902 are coaxially installed.

[0018] Please refer to Figure 3One end of the second shaft 12 is connected to the spline hub 507, and the other end is connected to the secondary sun gear 902. There are three evenly distributed notches on the spline hub 507 for installing the slider 504, and a spring ring 506 is installed under the slider 504. The second combined gear ring 505 is installed on the second shaft 12 through a bearing. A lock ring 501 is installed between the spline hub 507 and the first combined gear ring 502 and the second combined gear ring 505, and the combined sleeve 503 is clearance-matched with the spline hub 507. The second combined gear ring 505 is connected to the special-shaped gear ring 404, and the first combined gear ring 502 is connected to the primary planet carrier 401. Through the axial movement of the coupling sleeve 503, the shaft 2 12 can be combined with the primary planetary carrier 401 or the special-shaped ring gear 404. The primary planetary carrier 401 and the special-shaped ring gear 404 can respectively transmit power to the secondary sun gear 902, thereby realizing two speed inputs of the secondary sun gear 902. Through the combination of the two-stage input and output of the secondary planetary gear system 9, a four-speed speed regulation effect can be achieved.

[0019] Please refer to Figure 4 and Figure 5 , the primary sun gear 403 is connected to the shaft 11 through a key, and one end of the shaft 11 is only connected to the primary sun gear 403. The three primary planetary gears 402 are evenly distributed in the primary planetary gear system 4 through the primary planetary carrier 401, and mesh with the primary sun gear 403 and the special-shaped gear ring 404. The primary planetary carrier 401 is connected to the three primary planetary gears 402 through a bearing, and the end of the shaft section on the primary planetary carrier 401 is connected to the brake disc of the brake 3 through a key, and a boss is provided at the center of the end face of one end of the primary planetary carrier 401 without a shaft section, and a spline is provided on the boss, and the spline can be connected to the first combined gear ring 502. The special-shaped design of the special-shaped gear ring 404 forms a protruding rotation space at one end of the special-shaped gear ring 404, and a hole with a spline groove is provided in the rotation space, which can be connected to the second combined gear ring 505, and the other side of the special-shaped gear ring 404 is connected to the brake disc of the brake 2 6 through bolts.

[0020] Please refer to Figure 6 The three secondary planetary gears 903 are evenly distributed in the secondary planetary gear system 9 through the secondary planetary carrier 904, and mesh with the secondary sun gear 902 and the secondary ring gear 901. The secondary planetary carrier 904 is connected to the three secondary planetary gears 903 through bearings, and the end of the shaft section of the secondary planetary carrier 904 is connected to the brake disc of the brake three 7 through a key, and the input end of the second clutch 1002 is installed on the secondary planetary carrier 904, and the power of the secondary planetary carrier 904 can be finally transmitted to the wheel hub 13 through the second clutch 1002. The input end of the first clutch 1001 is installed on the secondary ring gear 901, and the power of the secondary ring gear 901 can be finally transmitted to the wheel hub 13 through the first clutch 1001, and one end of the secondary ring gear 901 is connected to the brake disc of the brake four 8 through bolts.

[0021] Please refer to Figure 7 and Figure 8 In the secondary planetary gear train 9, the secondary ring gear 901 and the secondary planet carrier 904 are both provided with slots for installing the clutch plate, that is, the secondary ring gear 901 and the secondary planet carrier 904 can be regarded as components of the dual clutch 10, which can simplify the structure and achieve lightweight design.

[0022] The speed regulation method of the wheel hub motor drive device is described below. The synchronizer 5 is located in the rotation space of the special-shaped gear ring 404, the first combined gear ring 502 of the synchronizer 5 and the boss at the center of the primary planet carrier 401 are connected by splines, the second combined gear ring 505 of the synchronizer 5 is connected to the rotating part of the special-shaped gear ring 404 by splines, and the second combined gear ring 505 is installed on the shaft 2 12 through a bearing, and one end of the shaft 2 12 and the spline hub 507 of the synchronizer 5 are connected by splines. When the coupling sleeve 503 of the synchronizer 5 moves axially, if it moves in the direction of the first coupling ring gear 502, only the power of the first-stage planetary carrier 401 in the first-stage planetary gear train 4 can be transmitted to the second shaft 12 through the synchronizer 5, and then the power is input into the second-stage planetary gear train 9 by the second shaft 12; if it moves in the direction of the second coupling ring gear 505, only the power of the special-shaped ring gear 404 in the first-stage planetary gear train 4 can be transmitted to the second shaft 12 through the synchronizer 5, and then the power is input into the second-stage planetary gear train 9 by the second shaft 12. The second-stage planetary carrier 904 and the second-stage ring gear 901 can be respectively combined with the flywheel 1003 of the dual clutch 10 through the first clutch 1001 and the second clutch 1002 to achieve two speed outputs. Through the combination of the two speed inputs and outputs of the second-stage planetary gear train 9, the four-speed speed regulation effect is achieved.

[0023] The transmission routes of each gear are as follows: First gear: Its power flow is as follows Fig. 9 As shown, the motor 1 rotates forward, the brake 1 3 and the brake 3 7 brake, and the primary planet carrier 401 and the secondary planet carrier 904 remain fixed. In the primary planetary gear train 4, the motor 1 is used as the input of the primary sun gear 403, and the special-shaped ring gear 404 outputs. In the synchronizer 5, the coupling sleeve 503 moves axially and combines with the second coupling ring gear 505, and the second coupling ring gear 505 is connected with the special-shaped ring gear 404, that is, the power can be transmitted from the special-shaped ring gear 404 to the shaft 2 12; in the secondary planetary gear train 9, the shaft 2 12 transmits the power to the secondary sun gear 902, and the secondary ring gear 901 outputs. The input end of the first clutch 1001 is installed on the secondary ring gear 901, and the first clutch 1001 in the dual clutch 10 is engaged, and the secondary ring gear 901 transmits the power to the flywheel 1003 of the dual clutch 10, and then the flywheel 1003 transmits the power to the hub 13.

[0024] Second gear: Its power flow is as follows Fig.10As shown, the motor 1 is reversed, the brake 1 3 and the brake 4 8 are braked, and the primary planet carrier 401 and the secondary ring gear 901 remain fixed. In the primary planetary gear train 4, the motor 1 is used as the input of the primary sun gear 403, and the special-shaped ring gear 404 is output. In the synchronizer 5, the coupling sleeve 503 moves axially and is coupled with the second coupling ring gear 505, and the second coupling ring gear 505 is connected with the special-shaped ring gear 404, that is, the power can be transmitted from the special-shaped ring gear 404 to the shaft 2 12. In the secondary planetary gear train 9, the shaft 2 12 transmits the power to the secondary sun gear 902, and the secondary planet carrier 904 outputs. The input end of the second clutch 1002 is installed on the secondary planet carrier 904. The second clutch 1002 in the dual clutch 10 is coupled, and the secondary planet carrier 904 transmits the power to the flywheel 1003 of the dual clutch 10, and the flywheel 1003 transmits the power to the hub 13.

[0025] Third gear: Its power flow is as follows Fig.11 As shown, the motor 1 is reversed, the brake 2 6 and the brake 3 7 are braked, and the special-shaped ring gear 404 and the secondary planet carrier 904 remain fixed. In the primary planetary gear train 4, the motor 1 is used as the input of the primary sun gear 403, and the primary planet carrier 401 is output. In the synchronizer 5, the coupling sleeve 503 moves axially and is coupled with the first coupling ring gear 502. The first coupling ring gear 502 is splined to the center boss on the primary planet carrier 401, that is, the power can be transmitted from the primary planet carrier 401 to the shaft 2 12. In the secondary planetary gear train 9, the shaft 2 12 transmits the power to the secondary sun gear 902, and the secondary ring gear 901 outputs. The input end of the first clutch 1001 is installed on the secondary ring gear 901. The first clutch 1001 in the dual clutch 10 is coupled, and the secondary ring gear 901 transmits the power to the flywheel 1003 of the dual clutch 10, and the flywheel 1003 transmits the power to the hub 13.

[0026] Fourth gear: Its power flow is as follows Fig.12 As shown, the motor 1 rotates forward, the brake 2 6 and the brake 4 8 brake, and the special-shaped ring gear 404 and the secondary ring gear 901 remain fixed. In the primary planetary gear train 4, the motor 1 serves as the input of the primary sun gear 403, and the primary planet carrier 401 outputs. In the synchronizer 5, the coupling sleeve 503 moves axially and combines with the first coupling ring gear 502, and the first coupling ring gear 502 is splined to the center boss on the primary planet carrier 401, that is, the power can be transmitted from the primary planet carrier 401 to the shaft 2 12. In the secondary planetary gear train 9, the shaft 2 12 transmits the power to the secondary sun gear 902, and the secondary planet carrier 904 outputs. The input end of the second clutch 1002 is installed on the secondary planet carrier 904, and the second clutch 1002 in the dual clutch 10 is engaged, and the secondary planet carrier 904 transmits the power to the flywheel 1003 of the dual clutch 10, and then the flywheel 1003 transmits the power to the hub 13.

[0027] The transmission ratios of the above four gears are calculated as follows: ; ; ; ; in, i 1 is the first gear transmission ratio, i 2 is the second gear transmission ratio, i 3 is the third gear transmission ratio, i 4 is the fourth gear transmission ratio, z 1 is the number of teeth of the first-stage sun gear, z 3 is the number of teeth on the special-shaped gear ring. z 4 is the number of teeth of the secondary sun gear, z 6 is the number of teeth on the secondary gear ring.

[0028] In summary, the four-speed new energy vehicle wheel hub motor driving device and speed regulation method provided by the present invention have the following beneficial effects: 1. In the transmission part, the synchronizer is installed inside the primary planetary gear train, and the input end of the dual clutch can be directly installed on the secondary planetary gear train, which can reduce the space occupied by the dual clutch, make the overall structure compact, and realize the integrated design of the wheel; 2. The wheel hub motor drive device has a simple structure and can achieve four-speed speed regulation. The invention uses the deceleration effect of the planetary gear train, and can achieve double deceleration and torque increase in each gear through a two-stage planetary gear train, so that the final output torque is maximized, and the four-speed speed regulation can be achieved only by switching the synchronizer and cooperating with the corresponding brake; 3. The present invention achieves a speed regulation effect through structural design, that is, the motor can achieve multi-gear output while maintaining the speed or power unchanged, which enables the motor to work in a stable state and reduce power loss; 4. Compared with other planetary gear transmission mechanisms that only use the planet carrier as the output, the present invention uses the special-shaped ring gear and the secondary ring gear as the output part, so that the planetary gear system is more fully utilized, and can generate a larger output torque and more speed gears.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A four-speed new energy vehicle wheel hub motor drive device, characterized in that: It includes a motor, a housing, a brake 1, a primary planetary gear train, a synchronizer, a brake 2, a brake 3, a brake 4, a secondary planetary gear train, a double clutch, a shaft 1, a shaft 2, and a wheel hub; The primary planetary gear train includes a primary planet carrier, three evenly distributed primary planetary gears, a primary sun gear and a special-shaped ring gear; The synchronizer includes a lock ring, a first combined gear ring, a combined sleeve, a slider, a second combined gear ring, a spring ring, and a spline hub; The secondary planetary gear train includes a secondary ring gear, a secondary sun gear, three evenly distributed secondary planetary gears, and a secondary planet carrier; The dual clutch includes a first clutch, a second clutch and a flywheel; The synchronizer is located in the rotation space of the special-shaped gear ring. The first shaft is the input shaft of the primary planetary gear train, and the second shaft is the input shaft of the secondary planetary gear train. The second combined gear ring is connected to the special-shaped gear ring, and the first combined gear ring is connected to the primary planet carrier. Through the axial movement of the coupling sleeve, shaft two can be combined with the primary planetary carrier or the special-shaped ring gear. The primary planetary carrier and the special-shaped ring gear can respectively transmit power to the secondary sun gear, thereby realizing two speed inputs of the secondary sun gear. Through the combination of the two-stage input and output of the secondary planetary gear system, a four-speed speed regulation effect can be achieved.

2. The four-speed new energy vehicle wheel hub motor drive device according to claim 1, characterized in that: The first shaft, the primary sun gear, the primary planet carrier, the special-shaped ring gear, the synchronizer, the second shaft and the secondary sun gear are coaxially installed.

3. The four-speed new energy vehicle wheel hub motor drive device according to claim 1, characterized in that: One end of shaft two is connected to the spline hub, and the other end is connected to the secondary sun gear; there are three evenly distributed grooves on the spline hub for installing the slider, a spring ring is installed under the slider, the second combined gear ring is installed on shaft two through a bearing, a locking ring is installed between the spline hub and the first combined gear ring and the second combined gear ring, and the combining sleeve and the spline hub are clearance-matched.

4. The four-speed new energy vehicle wheel hub motor drive device according to claim 1, characterized in that: The primary sun gear is connected to shaft one through a key, and one end of shaft one is only connected to the primary sun gear; the three primary planetary gears are evenly distributed in the primary planetary gear system through the primary planetary carrier, and are meshed with the primary sun gear and the special-shaped gear ring; the primary planetary carrier is connected to the three primary planetary gears through a bearing, the end of the shaft section on the primary planetary carrier is connected to the brake disc of brake one through a key, and a boss is provided at the center of the end surface of one end of the primary planetary carrier without the shaft section, and a spline is provided on the boss, and the spline can be connected to the first combined gear ring; a protruding rotating space is formed at one end of the special-shaped gear ring, and a hole with a spline groove is provided in the rotating space for connecting with the second combined gear ring, and the other side of the special-shaped gear ring is connected to the brake disc of brake two by bolts.

5. The four-speed new energy vehicle wheel hub motor drive device according to claim 4, characterized in that: The three secondary planetary gears are evenly distributed in the secondary planetary gear system through the secondary planetary carrier, and are meshed with the secondary sun gear and the secondary ring gear; the secondary planetary carrier is connected to the three secondary planetary gears through bearings, the end of the shaft section of the secondary planetary carrier is connected to the brake disc of brake three through a key, and the input end of the second clutch is installed on the secondary planetary carrier, and the power of the secondary planetary carrier can be finally transmitted to the wheel hub through the second clutch; the input end of the first clutch is installed on the secondary ring gear, and the power of the secondary ring gear can be finally transmitted to the wheel hub through the first clutch, and one end of the secondary ring gear is connected to the brake disc of brake four through bolts.

6. The four-speed new energy vehicle hub motor drive device according to claim 1, characterized in that: Both the secondary ring gear and the secondary planet carrier are provided with slots for installing the clutch plate.

7. The four-speed new energy vehicle wheel hub motor driving device according to claim 1, characterized in that: The flywheel is connected to the wheel hub by bolts, and the housing is connected to the motor by bolts.

8. The speed regulation method of the four-speed new energy vehicle hub motor drive device according to any one of claims 1 to 7, characterized in that: include: When the coupling sleeve moves axially and moves toward the first coupling ring gear, only the power of the first-stage planetary carrier in the first-stage planetary gear train can be transmitted to the second shaft through the synchronizer, and then the second shaft inputs the power into the second-stage planetary gear train; When the coupling sleeve moves axially and moves toward the second coupling ring gear, only the power of the special-shaped ring gear in the first-stage planetary gear train can be transmitted to the second shaft through the synchronizer, and then the second shaft inputs the power into the second-stage planetary gear train; The secondary planetary carrier and the secondary ring gear can be combined with the flywheel of the dual clutch through the second clutch and the first clutch respectively to achieve two speed outputs. Through the combination of the two speed input and output of the secondary planetary gear system, a four-speed speed regulation effect can be achieved.

9. The speed regulation method of the four-speed new energy vehicle wheel hub motor drive device according to claim 8, characterized in that: The four-speed speed regulation process is as follows: First gear: the motor rotates forward, brake one and brake three brake, and the primary planetary carrier and the secondary planetary carrier remain fixed; in the primary planetary gear system, the motor serves as the input of the primary sun gear, and the special-shaped ring gear outputs; in the synchronizer, the coupling sleeve moves axially and combines with the second coupling ring gear, and the second coupling ring gear is connected to the special-shaped ring gear, that is, the power can be transmitted from the special-shaped ring gear to the second shaft; in the secondary planetary gear system, the second shaft transmits the power to the secondary sun gear, and the secondary ring gear outputs, and the input end of the first clutch is installed on the secondary ring gear, and the first clutch in the dual clutch is engaged, and the secondary ring gear transmits the power to the flywheel of the dual clutch, and then the flywheel transmits the power to the wheel hub; Second gear: the motor reverses, brake one and brake four brake, the primary planet carrier and the secondary ring gear remain fixed; in the primary planetary gear system, the motor serves as the input of the primary sun gear, and the special-shaped ring gear outputs; in the synchronizer, the coupling sleeve moves axially and combines with the second coupling ring gear, and the second coupling ring gear is connected to the special-shaped ring gear, that is, the power can be transmitted from the special-shaped ring gear to the second shaft; in the secondary planetary gear system, the second shaft transmits the power to the secondary sun gear, and the secondary planet carrier outputs, the input end of the second clutch is installed on the secondary planet carrier, the second clutch in the dual clutch is engaged, the secondary planet carrier transmits the power to the flywheel of the dual clutch, and then the flywheel transmits the power to the wheel hub; Third gear: the motor reverses, brake 2 and brake 3 brake, and the special-shaped ring gear and the secondary planet carrier remain fixed; in the primary planetary gear system, the motor serves as the input of the primary sun gear and the primary planet carrier outputs; in the synchronizer, the coupling sleeve moves axially and combines with the first coupling ring gear, and the first coupling ring gear is splined to the center boss on the primary planet carrier, that is, the power can be transmitted from the primary planet carrier to the second shaft; in the secondary planetary gear system, the second shaft transmits the power to the secondary sun gear, and the secondary ring gear outputs, and the input end of the first clutch is installed on the secondary ring gear, and the first clutch in the dual clutch is engaged, and the secondary ring gear transmits the power to the flywheel of the dual clutch, and then the flywheel transmits the power to the wheel hub; Fourth gear: the motor rotates forward, brake two and brake four brake, and the special-shaped ring gear and the secondary ring gear remain fixed; in the primary planetary gear system, the motor serves as the input of the primary sun gear and the primary planet carrier outputs it; in the synchronizer, the axial movement of the combining sleeve is combined with the first combining ring gear, and the first combining ring gear is connected to the center boss on the primary planet carrier through a spline, that is, the power can be transmitted from the primary planet carrier to shaft two; in the secondary planetary gear system, shaft two transmits the power to the secondary sun gear, and the secondary planet carrier outputs it. The input end of the second clutch is installed on the secondary planet carrier, and the second clutch in the dual clutch is engaged, and the secondary planet carrier transmits the power to the flywheel of the dual clutch, and then the flywheel transmits the power to the wheel hub.

10. The speed regulation method of the four-speed new energy vehicle wheel hub motor drive device according to claim 9, characterized in that: The transmission ratios of the four-speed speed regulation are: ； ； ； ； in, i 1 is the first gear transmission ratio, i 2 is the second gear transmission ratio, i 3 is the third gear transmission ratio, i 4 is the fourth gear transmission ratio, z 1 is the number of teeth of the first-stage sun gear, z 3 is the number of teeth on the special-shaped gear ring. z 4 is the number of teeth of the secondary sun gear, z 6 is the number of teeth on the secondary gear ring.

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