A four-gear dual-motor hybrid power transmission device and transmission method

Abstract

A four-gear dual-motor driven hybrid power transmission device and transmission method, belonging to the technical field of transmission. The input shaft is connected to the engine, the generator motor and the drive motor; the single planetary gear is connected to the first clutch and the second clutch, the first clutch is connected to the drive motor, and the second clutch is connected to the CR-CR type planetary gear mechanism; the drive motor is connected to the CR-CR type planetary gear mechanism; the CR-CR type planetary gear mechanism is connected to the first brake and the second brake, and the other ends of the first brake and the second brake are fixedly mounted on the housing; the front planet carrier and rear ring gear assembly of the CR-CR type planetary gear mechanism is connected to the output shaft. The structure of the present invention has the functions of energy recovery and parking power generation. The CR-CR type planetary gear mechanism and the single planetary gear can independently design the transmission ratio, and has the characteristics of high transmission efficiency, low component speed and large transmission ratio.

Description

Technical Field

[0001] The present invention relates to a four-gear dual-motor driven hybrid power transmission device and a transmission method, belonging to the technical field of transmissions. Background Art

[0002] With the rapid development of the automotive industry and technological innovation, as well as the gradual increase in the number of new energy vehicles actually in operation, the application of new energy hybrid devices in the field of transmissions is becoming more and more extensive. Hybrid devices can meet various power combination modes of engines, generators, and electric motors, and multi-speed transmissions can change speed ratios according to different working conditions, which can achieve better vehicle benefits. In the next few years, it will be the main development direction of new energy vehicles.

[0003] However, existing hybrid power devices have relatively few gears, mainly single gear or two gears, with large speed differences between gears and a prominent problem of large gear shock. Summary of the Invention

[0004] In order to solve the problems existing in the background technology, the present invention provides a four-gear-dual-motor driven hybrid power transmission device and a transmission method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a four-speed, dual-motor hybrid power transmission device, comprising a generator motor, an input shaft, a first clutch, a second clutch, a drive motor, a first brake, a second brake, an output shaft, a housing, a single planetary gear set, and a CR-CR planetary gear mechanism. The input end of the input shaft is connected to the power system of the engine, and the output end of the input shaft is connected to the generator motor through the single planetary gear set and to the drive motor through the CR-CR planetary gear mechanism. The single planetary gear set is connected to one end of the first clutch and one end of the second clutch, the other end of the first clutch is connected to the drive motor, and the other end of the second clutch is connected to the third sun gear of the CR-CR planetary gear mechanism. The other end of the drive motor is connected to the front ring gear and rear planetary carrier assembly of the CR-CR planetary gear mechanism. The front ring gear and rear planetary carrier assembly of the CR-CR planetary gear mechanism is connected to one end of the first brake, and the second sun gear of the CR-CR planetary gear mechanism is connected to one end of the second brake. The other ends of the first brake and the second brake are both fixedly mounted to the housing. The front planetary carrier and rear ring gear assembly of the CR-CR planetary gear mechanism is connected to the output shaft.

[0006] A first gear transmission method of a four-gear dual-motor driven hybrid power transmission device according to the present invention comprises the following steps:

[0007] S1: putting the second clutch, the first brake and the engine into a working state, and putting the generator motor, the first clutch, the drive motor and the second brake into a non-working state;

[0008] S2: Starting the engine, transmitting the engine power to the third sun gear of the CR-CR planetary gear mechanism via the input shaft and the second clutch, causing the third sun gear to rotate clockwise;

[0009] S3: The front planet carrier and rear ring gear assembly of the CR-CR planetary gear mechanism rotates clockwise through the third planetary gear of the CR-CR planetary gear mechanism;

[0010] S4: The front planetary carrier and rear ring gear assembly are connected to the drive wheel through the output shaft to output power.

[0011] A second-gear transmission method for a four-gear dual-motor hybrid power transmission device according to the present invention comprises the following steps:

[0012] S1: putting the second clutch, the second brake and the engine into a working state, and putting the generator motor, the first clutch, the drive motor and the first brake into a non-working state;

[0013] S2: Starting the engine, transmitting the engine power to the third sun gear of the CR-CR planetary gear mechanism via the input shaft and the second clutch, causing the third sun gear to rotate clockwise;

[0014] S3: The third sun gear drives the third planetary gear of the CR-CR planetary gear mechanism to rotate;

[0015] S4: The third planetary gear drives the front planet carrier and rear ring gear assembly of the CR-CR type planetary gear mechanism to rotate clockwise.

[0016] At the same time, the third planetary gear drives the front ring gear and rear planetary carrier assembly to rotate clockwise, and the front ring gear and rear planetary carrier assembly drives the front planetary carrier and rear ring gear assembly to rotate clockwise.

[0017] The front planetary carrier and rear ring gear assembly are connected to the drive wheel via an output shaft to output power.

[0018] A three-gear transmission method for a four-gear dual-motor driven hybrid power transmission device according to the present invention comprises the following steps:

[0019] S1: putting the first clutch, the second clutch and the engine into a working state, and putting the generator motor, the drive motor, the first brake and the second brake into a non-working state;

[0020] S2: Starting the engine, the engine power is transmitted to the front ring gear, rear planetary carrier assembly and the third sun gear of the CR-CR type planetary gear mechanism via the input shaft, the first clutch and the second clutch, causing the front ring gear, rear planetary carrier assembly and the third sun gear to rotate clockwise;

[0021] S3: the front ring gear, rear planet carrier assembly and the third sun gear drive the third planet gear to rotate clockwise;

[0022] S4: The third planetary gear drives the front planetary carrier and rear ring gear assembly to rotate clockwise;

[0023] S5: The front planetary carrier and rear ring gear assembly are connected to the drive wheel via the output shaft to output power.

[0024] A four-speed transmission method for a four-speed dual-motor driven hybrid power transmission device according to the present invention comprises the following steps:

[0025] S1: putting the first clutch, the second brake and the engine into a working state, and putting the generator motor, the second clutch, the drive motor and the first brake into a non-working state;

[0026] S2: Starting the engine, the engine power is transmitted to the front ring gear and rear planetary carrier assembly of the CR-CR type planetary gear mechanism via the input shaft and the first clutch, causing the front ring gear and rear planetary carrier assembly to rotate clockwise;

[0027] S3: the front ring gear and rear planet carrier assembly of the CR-CR planetary gear mechanism drives the front planet carrier and rear ring gear assembly of the CR-CR planetary gear mechanism to rotate clockwise;

[0028] S4: The front planetary carrier and rear ring gear assembly are connected to the drive wheel through the output shaft to output power.

[0029] The present invention provides an EV gear transmission method for a four-gear dual-motor driven hybrid power transmission device, the method comprising the following steps:

[0030] S1: putting the drive motor and the second brake in a working state, and putting the generator motor, the first clutch, the second clutch, the first brake and the engine in a non-working state;

[0031] S2: Start the drive motor, which drives the front ring gear and rear planetary carrier assembly to rotate clockwise;

[0032] S3: The front ring gear and rear planet carrier assembly drive the front planet carrier and rear ring gear assembly to rotate clockwise;

[0033] S4: The front planetary carrier and rear ring gear assembly are connected to the drive wheel through the output shaft to output power.

[0034] The present invention provides a parallel mode transmission method for a four-gear dual-motor hybrid power transmission device, the method comprising the following steps:

[0035] S1: putting the first clutch, the second clutch, the drive motor and the engine into a working state, and putting the generator motor, the first brake and the second brake into a non-working state;

[0036] S2: starting the drive motor and the engine, and driving the front ring gear, the rear planetary carrier assembly and the third sun gear to rotate clockwise at the same speed;

[0037] S3: drives the front planet carrier and rear ring gear assembly to rotate clockwise through the third planetary gear;

[0038] S4: The front planetary carrier and rear ring gear assembly are connected to the drive wheel through the output shaft to output power.

[0039] The present invention provides an ECVT mode transmission method for a four-speed dual-motor hybrid power transmission device, the method comprising the following steps:

[0040] S1: putting the generator motor, the second clutch, the drive motor and the engine into a working state, and putting the first clutch, the first brake and the second brake into a non-working state;

[0041] S2: Starting the engine, transmitting engine power to the third sun gear via the input shaft and the second brake, causing the third sun gear to rotate clockwise;

[0042] Starting the drive motor to transmit power to the front ring gear and rear planetary carrier assembly;

[0043] S3: drives the front planet carrier and rear ring gear assembly to rotate clockwise through the third planetary gear;

[0044] S4: The front planetary carrier and rear ring gear assembly are connected to the drive wheel through the output shaft to output power.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The present invention has a simple and compact structure and provides a hybrid vehicle transmission device based on dual single-stage planetary gear rows and dual motor drive, including a CR-CR planetary gear mechanism, a single planetary row, two motors, two brakes and two clutches. Different combinations of the two clutches and two brakes, and different operating states of the engine and the two motors can realize EV gear, engine fourth gear, parallel mode and ECVT mode, and has energy recovery and parking power generation functions. The motor can also provide quite effective assistance during acceleration to avoid excessive engine load. The CR-CR planetary gear mechanism and the single planetary row can independently design the transmission ratio, and have the characteristics of high transmission efficiency, low component speed and large transmission ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the present invention;

[0048] Figure 2 It is a gear diagram;

[0049] Figure 3 It is a schematic diagram of a gear structure;

[0050] Figure 4 It is a schematic diagram of the second gear structure;

[0051] Figure 5 It is a schematic diagram of the three-gear structure;

[0052] Figure 6 It is a schematic diagram of the four-gear structure;

[0053] Figure 7 This is a schematic diagram of the EV gear structure;

[0054] Figure 8 It is a schematic diagram of the parallel mode structure;

[0055] Figure 9 It is a schematic diagram of the ECVT mode structure. DETAILED DESCRIPTION

[0056] The technical solutions 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 only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] A four-speed dual-motor hybrid transmission device includes a generator motor 1, an input shaft 2, a first clutch 7, a second clutch 8, a drive motor 9, a first brake 16, a second brake 17, an output shaft 18, a housing 19, a single planetary gear and a CR-CR planetary gear mechanism. The input end of the input shaft 2 is connected to the power system of the engine, and the output end of the input shaft 2 is connected to the generator motor 1 through the first sun gear 3 of the single planetary gear and is connected to the drive motor 9 through the CR-CR planetary gear mechanism; the planet carrier 5 of the single planetary gear is connected to one end of the first clutch 7 and one end of the second clutch 8, and the other end of the first clutch 7 is connected to the first clutch 7. The drive motor 9 is connected, and the other end of the second clutch 8 is connected to the third sun gear 13 of the CR-CR planetary gear mechanism; the other end of the drive motor 9 is connected to the front ring gear and rear planetary carrier assembly 12 of the CR-CR planetary gear mechanism; the front ring gear and rear planetary carrier assembly 12 of the CR-CR planetary gear mechanism is connected to one end of the first brake 16, and the second sun gear 10 of the CR-CR planetary gear mechanism is connected to one end of the second brake 17, and the other ends of the first brake 16 and the second brake 17 are both fixedly mounted on the housing 19; the front planetary carrier and rear ring gear assembly 15 of the CR-CR planetary gear mechanism is connected to the output shaft 18.

[0058] The single planetary gear includes a first sun gear 3, a first planetary gear 4, a planet carrier 5 and an outer ring gear 6; the planet carrier 5 is mounted on the outer side of the input shaft 2, and the first planetary gear 4 is provided on the planet carrier 5. The first planetary gear 4 is meshed with the first sun gear 3 and the outer ring gear 6. The outer ring gear 6 is fixedly mounted on the housing 19, and the first sun gear 3 is connected to the generator motor 1.

[0059] A first gear transmission method of a four-gear dual-motor driven hybrid power transmission device according to the present invention comprises the following steps:

[0060] S1: The second clutch 8, the first brake 16 and the engine are in a working state, and the generator motor 1, the first clutch 7, the drive motor 9 and the second brake 17 are in a non-working state;

[0061] S2: The engine is started, and the engine power is transmitted to the third sun gear 13 of the CR-CR planetary gear mechanism via the input shaft 2 and the second clutch 8, causing the third sun gear 13 to rotate clockwise;

[0062] S3: The rotation of the third sun gear 13 drives the third planetary gear 14 to rotate, and the third planetary gear 14 of the CR-CR planetary gear mechanism drives the front planet carrier and rear ring gear assembly 15 of the CR-CR planetary gear mechanism to rotate clockwise;

[0063] S4: The front planetary carrier and rear ring gear assembly 15 is connected to the drive wheel via the output shaft 18 to output power.

[0064] In the first gear, the speed is low. When the third planetary gear 14 drives the front planetary carrier and rear ring gear assembly 15 to rotate clockwise, a torque is generated on the front ring gear and rear planetary carrier assembly 12 to rotate counterclockwise. To prevent counterclockwise rotation, the first brake 16 is activated, so that the engine power is transmitted to the output shaft 18 through the input shaft 2, the third sun gear 13, the third planetary gear 14 and the front planetary carrier and rear ring gear assembly 15.

[0065] A second-gear transmission method for a four-gear dual-motor hybrid power transmission device according to the present invention comprises the following steps:

[0066] S1: The second clutch 8, the second brake 17 and the engine are in a working state, and the generator motor 1, the first clutch 7, the drive motor 9 and the first brake 16 are in a non-working state;

[0067] S2: The engine is started, and the engine power is transmitted to the third sun gear 13 of the CR-CR planetary gear mechanism via the input shaft 2 and the second clutch 8, causing the third sun gear 13 to rotate clockwise;

[0068] S3: The third sun gear 13 drives the third planetary gear 14 of the CR-CR planetary gear mechanism to rotate;

[0069] S4: The third planetary gear 14 drives the front planet carrier and rear ring gear assembly 15 of the CR-CR type planetary gear mechanism to rotate clockwise.

[0070] At the same time, the third planetary gear 14 drives the front ring gear and rear planetary carrier assembly 12 to rotate clockwise. Since the second brake 17 is working and the second sun gear 10 is fixed, the front ring gear and rear planetary carrier assembly 12 drives the front planetary carrier and rear ring gear assembly 15 to rotate clockwise through the second planetary gear 11.

[0071] The front planetary carrier and rear ring gear assembly 15 is connected to the drive wheel via an output shaft 18 to output power.

[0072] In this gear position, the front planetary carrier and rear ring gear assembly 15 receives power output from the third planetary gear 14 and the second planetary gear 11 at the same time.

[0073] A three-gear transmission method for a four-gear dual-motor driven hybrid power transmission device according to the present invention comprises the following steps:

[0074] S1: The first clutch 7, the second clutch 8 and the engine are in a working state, and the generator motor 1, the drive motor 9, the first brake 16 and the second brake 17 are in a non-working state;

[0075] S2: The engine is started, and the engine power is transmitted to the front ring gear and rear planetary carrier assembly 12 and the third sun gear 13 of the CR-CR planetary gear mechanism via the input shaft 2, the first clutch 7, and the second clutch 8. The input shaft 2 is connected to the front ring gear and rear planetary carrier assembly 12 and the third sun gear 13 as a whole, so that the front ring gear and rear planetary carrier assembly 12 and the third sun gear 13 rotate clockwise at the same speed as the input shaft 2.

[0076] S3: the front ring gear rear planet carrier assembly 12 and the third sun gear 13 drive the third planet gear 14 to rotate clockwise;

[0077] S4: The third planetary gear 14 drives the front planetary carrier and rear ring gear assembly 15 to rotate clockwise;

[0078] S5: The front planetary carrier and rear ring gear assembly 15 is connected to the drive wheel via the output shaft 18 to output power. At this time, the second planetary gear 11 is in an idling state.

[0079] A four-speed transmission method for a four-speed dual-motor driven hybrid power transmission device according to the present invention comprises the following steps:

[0080] S1: The first clutch 7, the second brake 17 and the engine are in a working state, and the generator motor 1, the second clutch 8, the drive motor 9 and the first brake 16 are in a non-working state;

[0081] S2: The engine is started, and the engine power is transmitted to the front ring gear and rear planetary carrier assembly 12 of the CR-CR type planetary gear mechanism via the input shaft 2 and the first clutch 7, causing the front ring gear and rear planetary carrier assembly 12 to rotate clockwise;

[0082] S3: As the second brake 17 is actuated, the second sun gear 10 is fixed, and the front ring gear and rear planet carrier assembly 12 of the CR-CR planetary gear mechanism drives the front planet carrier and rear ring gear assembly 15 of the CR-CR planetary gear mechanism to rotate clockwise via the second planetary gear 11;

[0083] S4: The front planetary carrier and rear ring gear assembly 15 is connected to the drive wheel via the output shaft 18 to output power. At this time, the third planetary gear 14 is in an idling state.

[0084] The present invention provides an EV gear transmission method for a four-gear dual-motor driven hybrid power transmission device, the method comprising the following steps:

[0085] S1: The drive motor 9 and the second brake 17 are in a working state, and the generator motor 1, the first clutch 7, the second clutch 8, the first brake 16 and the engine are in a non-working state;

[0086] S2: Starting the drive motor 9, which transmits power to the front ring gear and rear planetary carrier assembly 12, driving the front ring gear and rear planetary carrier assembly 12 to rotate clockwise;

[0087] S3: As the second brake 17 works, the second sun gear 10 is fixed, and the front ring gear and rear planet carrier assembly 12 drives the front planet carrier and rear ring gear assembly 15 to rotate clockwise through the second planetary gears 11;

[0088] S4: The front planetary carrier and rear ring gear assembly 15 is connected to the drive wheel via the output shaft 18 to output power.

[0089] The present invention provides a parallel mode transmission method for a four-gear dual-motor hybrid power transmission device, the method comprising the following steps:

[0090] S1: The first clutch 7, the second clutch 8, the drive motor 9 and the engine are in a working state, and the generator motor 1, the first brake 16 and the second brake 17 are in a non-working state;

[0091] S2: Start the drive motor 9 and the engine. The drive motor 9 is powered by the battery or the generator motor 1. The drive motor 9 and the engine drive the front ring gear, rear planetary carrier assembly 12 and the third sun gear 13 to rotate clockwise at the same speed.

[0092] S3: The third planetary gear 14 drives the front planet carrier and rear ring gear assembly 15 to rotate clockwise;

[0093] S4: The front planetary carrier and rear ring gear assembly 15 is connected to the drive wheel via the output shaft 18 to output power.

[0094] The present invention provides an ECVT mode transmission method for a four-speed dual-motor hybrid power transmission device, the method comprising the following steps:

[0095] S1: The generator motor 1, the second clutch 8, the drive motor 9 and the engine are in a working state, and the first clutch 7, the first brake 16 and the second brake 17 are in a non-working state;

[0096] The torque ratio between the front ring gear and rear planetary carrier assembly 12 and the front planetary carrier and rear ring gear assembly 15 in the planetary mechanism is fixed. The transmitted power is proportional to the rotational speed. The engine and drive motor 9 provide a more efficient power combination for the mechanism by adjusting the rotational speed. The power distribution is as follows: the drive motor 9 assists the engine in transmitting power to the final gear, and the generator motor 1 acts as a generator to distribute power from the engine to provide a power source for the drive motor 9.

[0097] When the car starts and runs at a low speed (0-30km / h), the engine transfers power to the generator motor 1, and the drive motor 9 provides the main power to drive the vehicle forward.

[0098] When the vehicle is running normally (30-100km / h), the engine distributes the power into two power flows, one of which directly drives the wheels and the other is transferred to the generator motor 1.

[0099] When the vehicle accelerates rapidly (>100km / h), in addition to the power provided by the engine, the drive motor 9 is also required to supplement the power. The engine and the drive motor 9 work together to provide the power required to accelerate the vehicle.

[0100] S2: The engine is started, and the engine power is transmitted to the third sun gear 13 via the input shaft 2 and the second brake 17, causing the third sun gear 13 to rotate clockwise;

[0101] The drive motor 9 is started. The power comes from the battery or the generator motor 1. The drive motor 9 transmits the power to the front ring gear and the rear planetary carrier assembly 12.

[0102] S3: The third planetary gear 14 drives the front planet carrier and rear ring gear assembly 15 to rotate clockwise;

[0103] S4: The front planetary carrier and rear ring gear assembly 15 is connected to the drive wheel via the output shaft 18 to output power.

[0104] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0105] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A four-gear dual-motor hybrid power transmission device, characterized in that: The invention comprises a generator motor (1), an input shaft (2), a first clutch (7), a second clutch (8), a drive motor (9), a first brake (16), a second brake (17), an output shaft (18), a housing (19), a single planetary gear and a CR-CR type planetary gear mechanism, wherein the input end of the input shaft (2) is connected to the power system of the engine, the output end of the input shaft (2) is connected to the generator motor (1) through the single planetary gear and is connected to the drive motor (9) through the CR-CR type planetary gear mechanism; the single planetary gear is connected to one end of the first clutch (7) and one end of the second clutch (8), the other end of the first clutch (7) is connected to the drive motor (9), and the other end of the second clutch (8) is connected to the third sun gear (13) of the CR-CR type planetary gear mechanism; the other end of the drive motor (9) is connected to the front ring gear and rear planet carrier assembly (12) of the CR-CR type planetary gear mechanism; The front ring gear and rear planet carrier assembly (12) of the CR-CR planetary gear mechanism is connected to one end of a first brake (16), the second sun gear (10) of the CR-CR planetary gear mechanism is connected to one end of a second brake (17), and the other ends of the first brake (16) and the second brake (17) are both fixedly mounted on a housing (19); the front planet carrier and rear ring gear assembly (15) of the CR-CR planetary gear mechanism is connected to an output shaft (18); the single planetary gear comprises a first sun gear (3), a first planetary gear (4), a planet carrier (5) and an outer ring gear (6); a planet carrier (5) is sleeved on the outer side of the input shaft (2), a first planetary gear (4) is provided on the planet carrier (5), the first planetary gear (4) is meshedly connected with the first sun gear (3) and the outer ring gear (6), the outer ring gear (6) is fixedly mounted on the housing (19), and the first sun gear (3) is connected to a generator motor (1).

2. A transmission method of a four-gear dual-motor driven hybrid power transmission device according to claim 1, characterized in that: The transmission method includes a first gear transmission method, and the first gear transmission method includes the following steps: S1: putting the second clutch (8), the first brake (16) and the engine in a working state, and putting the generator motor (1), the first clutch (7), the drive motor (9) and the second brake (17) in a non-working state; S2: starting the engine, and transmitting the engine power to the third sun gear (13) of the CR-CR type planetary gear mechanism via the input shaft (2) and the second clutch (8), so that the third sun gear (13) rotates clockwise; S3: driving the front planet carrier and rear ring gear assembly (15) of the CR-CR planetary gear mechanism to rotate clockwise via the third planetary gear (14) of the CR-CR planetary gear mechanism; S4: The front planet carrier rear ring gear assembly (15) is connected to the drive wheel via an output shaft (18) to output power.

3. A transmission method of a four-gear dual-motor driven hybrid power transmission device according to claim 1, characterized in that: The transmission method includes a second-gear transmission method, and the second-gear transmission method includes the following steps: S1: putting the second clutch (8), the second brake (17) and the engine in a working state, and putting the generator motor (1), the first clutch (7), the drive motor (9) and the first brake (16) in a non-working state; S2: starting the engine, and transmitting the engine power to the third sun gear (13) of the CR-CR type planetary gear mechanism via the input shaft (2) and the second clutch (8), so that the third sun gear (13) rotates clockwise; S3: the third sun gear (13) drives the third planetary gear (14) of the CR-CR type planetary gear mechanism to rotate; S4: The third planetary gear (14) drives the front planetary carrier and rear ring gear assembly (15) of the CR-CR type planetary gear mechanism to rotate clockwise. At the same time, the third planetary gear (14) drives the front ring gear and the rear planetary carrier assembly (12) to rotate clockwise, and the front ring gear and the rear planetary carrier assembly (12) drives the front planetary carrier and the rear ring gear assembly (15) to rotate clockwise. The front planet carrier rear ring gear assembly (15) is connected to the drive wheel via an output shaft (18) to output power.

4. A transmission method of a four-gear dual-motor driven hybrid power transmission device according to claim 1, characterized in that: The transmission method includes a three-gear transmission method, and the three-gear transmission method includes the following steps: S1: putting the first clutch (7), the second clutch (8) and the engine in a working state, and putting the generator motor (1), the drive motor (9), the first brake (16) and the second brake (17) in a non-working state; S2: starting the engine, and transmitting the engine power to the front ring gear rear planet carrier assembly (12) and the third sun gear (13) of the CR-CR type planetary gear mechanism through the input shaft (2), the first clutch (7) and the second clutch (8), so that the front ring gear rear planet carrier assembly (12) and the third sun gear (13) rotate clockwise; S3: the front ring gear rear planet carrier assembly (12) and the third sun gear (13) drive the third planet gear (14) to rotate clockwise; S4: the third planetary gear (14) drives the front planetary carrier rear ring gear assembly (15) to rotate clockwise; S5: The front planet carrier rear ring gear assembly (15) is connected to the drive wheel via an output shaft (18) to output power.

5. A transmission method of a four-gear dual-motor driven hybrid power transmission device according to claim 1, characterized in that: The transmission method includes a four-speed transmission method, and the four-speed transmission method includes the following steps: S1: putting the first clutch (7), the second brake (17) and the engine in a working state, and putting the generator motor (1), the second clutch (8), the drive motor (9) and the first brake (16) in a non-working state; S2: starting the engine, and transmitting the engine power to the front ring gear and rear planet carrier assembly (12) of the CR-CR type planetary gear mechanism through the input shaft (2) and the first clutch (7), so that the front ring gear and rear planet carrier assembly (12) rotates clockwise; S3: the front ring gear and rear planet carrier assembly (12) of the CR-CR type planetary gear mechanism drives the front planet carrier and rear ring gear assembly (15) of the CR-CR type planetary gear mechanism to rotate clockwise; S4: The front planet carrier rear ring gear assembly (15) is connected to the drive wheel via an output shaft (18) to output power.

6. A transmission method of a four-gear dual-motor driven hybrid power transmission device according to claim 1, characterized in that: The transmission method includes an EV gear transmission method, and the EV gear transmission method includes the following steps: S1: putting the drive motor (9) and the second brake (17) in a working state, and putting the generator motor (1), the first clutch (7), the second clutch (8), the first brake (16) and the engine in a non-working state; S2: starting the driving motor (9), so that the driving motor (9) drives the front ring gear and the rear planet carrier assembly (12) to rotate clockwise; S3: the front ring gear and rear planet carrier assembly (12) drives the front planet carrier and rear ring gear assembly (15) to rotate clockwise; S4: The front planet carrier rear ring gear assembly (15) is connected to the drive wheel via an output shaft (18) to output power.

7. A transmission method of a four-gear dual-motor driven hybrid power transmission device according to claim 1, characterized in that: The transmission method includes a parallel mode transmission method, and the parallel mode transmission method includes the following steps: S1: putting the first clutch (7), the second clutch (8), the drive motor (9) and the engine in a working state, and putting the generator motor (1), the first brake (16) and the second brake (17) in a non-working state; S2: starting the drive motor (9) and the engine, so that the drive motor (9) and the engine drive the front ring gear, the rear planetary carrier assembly (12) and the third sun gear (13) to rotate clockwise at the same speed; S3: driving the front planet carrier rear ring gear assembly (15) to rotate clockwise via the third planetary gear (14); S4: The front planet carrier rear ring gear assembly (15) is connected to the drive wheel via an output shaft (18) to output power.

8. A transmission method of a four-gear dual-motor driven hybrid power transmission device according to claim 1, characterized in that: The transmission method includes an ECVT mode transmission method, and the ECVT mode transmission method includes the following steps: S1: putting the generator motor (1), the second clutch (8), the drive motor (9) and the engine in a working state, and putting the first clutch (7), the first brake (16) and the second brake (17) in a non-working state; S2: starting the engine, and transmitting the engine power to the third sun gear (13) via the input shaft (2) and the second brake (17), causing the third sun gear (13) to rotate clockwise; The drive motor (9) is started, and the drive motor (9) transmits power to the front ring gear and rear planet carrier assembly (12); S3: driving the front planet carrier rear ring gear assembly (15) to rotate clockwise via the third planetary gear (14); S4: The front planet carrier rear ring gear assembly (15) is connected to the drive wheel via an output shaft (18) to output power.

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