Multi-gear dual-motor longitudinal front-drive hybrid transmission transmission mechanism and transmission method thereof

Abstract

The invention discloses a multi-gear dual-motor longitudinal front-drive hybrid transmission transmission mechanism and a transmission method thereof, and belongs to the technical field of hybrid electric vehicle transmission. The input shaft is connected with the engine, the front-row planetary gear train and the generator are arranged on the outer side, and the generator rotor is connected with the front-row planetary gear train; the front-row planetary gear train is connected with the first clutch and the second clutch, the first clutch is connected with the rear-row stepped planetary gear train, and the second clutch and the rear-row stepped planetary gear train are both connected with the driving motor; the rear-row stepped planetary gear train is connected with the first brake, the second brake and the output shaft, and the generator stator, the drive motor stator, the first brake and the second brake are all connected with the transmission shell. According to the invention, the economical efficiency of the high-speed cruise working condition is improved, power interruption or pause is avoided, the system integration level and the transmission efficiency are improved, the flexible regulation and control of the dynamic property and the balance of the economical efficiency are realized, and the space utilization rate and the transmission efficiency are improved.

Description

Technical Field

[0001] This invention relates to a multi-speed dual-motor longitudinally mounted front-wheel drive hybrid transmission mechanism and its transmission method, belonging to the field of hybrid vehicle transmission technology. Background Technology

[0002] In the field of hybrid vehicle transmission technology, existing hybrid transmissions are mainly divided into three categories: power-split type, series-parallel type, and multi-gear hybrid transmissions. Power-split hybrid transmissions achieve power distribution through planetary gear mechanisms. Although they have a compact structure, their fuel economy is limited in the high-speed range. Series-parallel hybrid transmissions can take advantage of the engine's high-efficiency range in parallel mode, but there are power interruption or jerking problems when switching modes. Multi-gear hybrid transmissions improve power performance by adding mechanical gears, but their adaptability to front-wheel drive layouts and system integration are often limited by longitudinal structures.

[0003] Current hybrid power control strategies are trending towards simplification, and compact hybrid vehicle transmissions have become an important development direction in the new energy field. However, existing technologies still face bottlenecks in the following aspects:

[0004] First, poor matching between engine speed and load during high-speed cruising leads to reduced fuel economy. Second, the smoothness of mode switching during the coupling / decoupling process between the motor and engine is difficult to guarantee. Third, the longitudinally mounted engine is not well adapted to the torque transmission path required by front-wheel drive, affecting system integration and transmission efficiency. Finally, the dynamic response matching of the dual-motor cooperative control strategy during multi-gear switching still needs to be optimized. Summary of the Invention

[0005] To address the problems existing in the background art, the present invention provides a multi-gear dual-motor longitudinally mounted front-wheel drive hybrid transmission mechanism and its transmission method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a multi-speed dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, comprising an input shaft, a generator, a first clutch, a second clutch, a drive motor, a first brake, a second brake, an output shaft, a front planetary gear train, and a rear stepped planetary gear train; the input end of the input shaft is connected to the engine's power system, and the front planetary gear train and the generator are mounted on the outer side of the input shaft, with the rotor of the generator connected to the front planetary gear train; the front planetary gear train is fixedly connected to the outer discs of the first clutch and the second clutch, the inner hub of the first clutch is connected to the rear stepped planetary gear train, and the inner hub of the second clutch and the rear stepped planetary gear train are fixedly connected to the rotor of the drive motor; the rear stepped planetary gear train is fixedly connected to the moving end of the first brake, the moving end of the second brake, and the input end of the output shaft, and the stator of the generator, the stator of the drive motor, the fixed end of the first brake, and the fixed end of the second brake are all fixedly connected to the transmission housing.

[0007] Furthermore, the front planetary gear train includes a first sun gear, a first planet gear, a first planet carrier, and a first ring gear; the first sun gear and the first planet carrier are both mounted on the outside of the input shaft, the first planet carrier is fixedly connected to the input shaft, and the first planet carrier is fixedly connected to the outer disk of the first clutch, the first planet gear is mounted on the first planet carrier, the first planet gear is meshed with the first sun gear and the first ring gear, the first ring gear is fixedly mounted on the transmission housing, and the first sun gear is fixedly connected to the rotor of the generator.

[0008] Furthermore, the rear stepped planetary gear system includes a second sun gear, a second stepped planetary gear, a second ring gear, a second planetary carrier, and a third sun gear; the inner hub of the first clutch is fixedly connected to the second planetary carrier, the second stepped planetary gear is mounted on the second planetary carrier, and the second planetary carrier is fixedly connected to the moving end of the second brake; one end of the second stepped planetary gear is meshed with the third sun gear, and the other end of the second stepped planetary gear is meshed with both the second sun gear and the second ring gear; the second ring gear is fixedly connected to the moving end of the first brake; the second sun gear is fixedly connected to the rotor of the drive motor; and the third sun gear is fixedly mounted on the outside of the output shaft.

[0009] The present invention discloses a first-gear transmission method for a multi-gear dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0010] S1: Put the generator, drive motor and engine into operation, put the first clutch and the second brake into disengagement, and put the second clutch and the first brake into engagement.

[0011] S2: Start the engine to drive the input shaft to rotate;

[0012] S3: The input shaft drives the first planetary carrier to rotate;

[0013] S4: Because the transmission housing fixes the first gear ring, the first planet carrier drives the first planet gear to rotate;

[0014] S5: The first planetary gear drives the first sun gear to rotate;

[0015] S6: The first sun gear drives the rotor of the generator to rotate. After generating electricity, the generator stores the energy in the battery to power the drive motor when needed.

[0016] S7: Since the second clutch is engaged, the power provided by the second clutch and the power output by the drive motor are combined to drive the second sun gear to rotate.

[0017] S8: The second gear ring is fixed in position by the first brake in the engaged state, and the second sun gear only drives the second step planetary gear to rotate;

[0018] S9: The second-stage planetary gear drives the third sun gear to rotate;

[0019] S10: The third sun gear drives the output shaft to rotate, thus outputting power.

[0020] The present invention discloses a second-gear transmission method for a multi-gear dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0021] S1: Put the generator, drive motor and engine into operation, put the first clutch, first brake and second brake into disengagement, and put the second clutch into engagement.

[0022] S2: Start the engine to drive the input shaft to rotate;

[0023] S3: The input shaft drives the first planetary carrier to rotate;

[0024] S4: Because the transmission housing fixes the first gear ring, the first planet carrier drives the first planet gear to rotate;

[0025] S5: The first planetary gear drives the first sun gear to rotate;

[0026] S6: The first sun gear drives the rotor of the generator to rotate. After generating electricity, the generator stores the energy in the battery to power the drive motor when needed.

[0027] S7: Since the second clutch is engaged, the power provided by the second clutch and the power output by the drive motor are combined to drive the second sun gear to rotate.

[0028] S8: The first brake is in the disengaged state and does not restrict the rotation of the second ring gear. The second sun gear simultaneously drives the second stepped planetary gear and the second ring gear to rotate.

[0029] S9: The second-stage planetary gear drives the third sun gear to rotate;

[0030] S10: The third sun gear drives the output shaft to rotate, thus outputting power.

[0031] The present invention discloses a three-speed transmission method for a multi-speed dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0032] S1: The generator and drive motor are both in working condition, the engine is not working, and the first clutch, the second clutch, the first brake and the second brake are all in the engaged state.

[0033] S2: Start the drive motor to drive the inner hub of the second clutch and the second sun gear to rotate synchronously;

[0034] S3: The second clutch in the engaged state drives the first planetary carrier to rotate through the first clutch in the engaged state, and the input shaft rotates freely. Since the gearbox housing fixes the first gear ring, the first planetary carrier drives the first planetary gear to rotate, the first planetary gear drives the first sun gear to rotate, and the first sun gear drives the generator rotor to rotate. After the generator generates electricity, it stores the energy in the battery to power the drive motor when needed.

[0035] S4: At the same time, the second sun gear drives the second step planetary gear to rotate. At this time, since the first brake and the second brake are engaged, the second gear ring and the second planetary carrier are fixed in position. The second step planetary gear drives the third sun gear to rotate the output shaft and output power.

[0036] The present invention discloses a four-speed transmission method for a multi-speed dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0037] S1: Put the drive motor into operation, the engine into operation, and both the second clutch and the first brake into disengagement; put both the first clutch and the second brake into engagement.

[0038] S2: Start the drive motor to drive the second sun gear to rotate. Since the second clutch is in the disengaged state, the power transmission to the first planetary carrier is cut off.

[0039] S3: At this time, since the first brake is in the disengaged state and does not restrict the rotation of the second gear ring, while the second brake is in the engaged state and the position of the second planetary carrier is fixed, the second sun gear drives the second stepped planetary gear and the second gear ring to rotate at the same time. The second stepped planetary gear drives the third sun gear to drive the output shaft to rotate, thus outputting power.

[0040] The present invention discloses an EV1 gear transmission method for a multi-gear dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0041] S1: Put the drive motor into operation, and put the first clutch, the second clutch, and the second brake into disengagement; put the first brake into engagement.

[0042] S2: The battery supplies power to the drive motor;

[0043] S3: The drive motor drives the second sun gear to rotate;

[0044] S4: At this time, the second gear ring is fixed in position by the first brake in the engaged state, while the second brake is in the disengaged state and does not restrict the rotation of the second planetary carrier. The second stepped planetary gear drives the third sun gear to drive the output shaft to rotate and output power.

[0045] The present invention discloses an EV 2-speed transmission method for a multi-gear dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0046] S1: Put the drive motor into operation, and put the first clutch, the second clutch, and the first brake into disengagement; put the second brake into engagement.

[0047] S2: The battery supplies power to the drive motor;

[0048] S3: The drive motor drives the second sun gear to rotate;

[0049] S4: At this time, the second planetary carrier is fixed in position by the second brake in the engaged state, while the first brake is in the disengaged state and does not restrict the rotation of the second ring gear. The second stepped planetary gear drives the third sun gear to rotate the output shaft and output power.

[0050] Compared with the prior art, the beneficial effects of the present invention are:

[0051] 1. This invention achieves flexible speed ratio control through a combination of a multi-gear planetary gear system and a clutch / brake, optimizes engine speed and load matching, and improves fuel economy during high-speed cruising.

[0052] 2. This invention employs coordinated control of the clutch engagement / disengagement state and the brake fixation / release state to achieve seamless connection of the power coupling / decoupling process, avoiding power interruption or jerking;

[0053] 3. This invention improves system integration and transmission efficiency by optimizing the torque transmission path of the longitudinally mounted engine and front-wheel drive, combined with a stepped planetary gear system and a dual-motor power convergence structure.

[0054] 4. This invention optimizes the power combination strategy of the motor and engine during multi-gear switching, thereby achieving a balance between flexible power control and economy.

[0055] 5. The overall structure of this invention adopts a compact layout of planetary gear train and clutch / brake, which reduces the number of parts and shrinks the axial space size, making it easier to install in the vehicle and arrange the automatic transmission axially, thereby improving space utilization and transmission efficiency. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the first gear transmission operation;

[0057] Figure 2 This is a schematic diagram of the second gear transmission.

[0058] Figure 3 This is a schematic diagram of the three-speed transmission.

[0059] Figure 4 This is a schematic diagram of the four-speed transmission.

[0060] Figure 5 This is a schematic diagram of the EV1 gear transmission.

[0061] Figure 6 This is a schematic diagram of the EV2 gear transmission. Detailed Implementation

[0062] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0063] A multi-speed dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism includes an input shaft 1, a generator 2, a first clutch 7, a second clutch 8, a drive motor 9, a first brake 13, a second brake 14, an output shaft 16, a front planetary gear train, and a rear stepped planetary gear train. The input end of the input shaft 1 is connected to the engine's power system. The front planetary gear train and the generator 2 are mounted on the outer side of the input shaft 1. The rotor of the generator 2 is connected to the front planetary gear train. The front planetary gear train is fixedly connected to the outer discs of the first clutch 7 and the second clutch 8. The inner hub of the first clutch 7 is connected to the rear stepped planetary gear train. The inner hub of the second clutch 8 and the rear stepped planetary gear train are both fixedly connected to the rotor of the drive motor 9. The rear stepped planetary gear train is fixedly connected to the moving end of the first brake 13, the moving end of the second brake 14, and the input end of the output shaft 16. The stator of the generator 2, the stator of the drive motor 9, the fixed end of the first brake 13, and the fixed end of the second brake 14 are all fixedly connected to the transmission housing.

[0064] Furthermore, the front planetary gear train includes a first sun gear 3, a first planet gear 4, a first planet carrier 5, and a first ring gear 6; the first sun gear 3 and the first planet carrier 5 are both mounted on the outside of the input shaft 1, the first planet carrier 5 is fixedly connected to the input shaft 1, and the first planet carrier 5 is fixedly connected to the outer disk of the first clutch 7. The first planet gear 4 is mounted on the first planet carrier 5, and the first planet gear 4 is meshed with the first sun gear 3 and the first ring gear 6. The first ring gear 6 is fixedly mounted on the transmission housing, and the first sun gear 3 is fixedly connected to the rotor of the generator 2.

[0065] Furthermore, the rear stepped planetary gear system includes a second sun gear 10, a second stepped planetary gear 11, a second ring gear 12, a second planetary carrier 15, and a third sun gear 17; the inner hub of the first clutch 7 is fixedly connected to the second planetary carrier 15, the second stepped planetary gear 11 is mounted on the second planetary carrier 15, and the second planetary carrier 15 is fixedly connected to the moving end of the second brake 14; one end of the second stepped planetary gear 11 is meshed with the third sun gear 17, and the other end of the second stepped planetary gear 11 is meshed with both the second sun gear 10 and the second ring gear 12; the second ring gear 12 is fixedly connected to the moving end of the first brake 13; the second sun gear 10 is fixedly connected to the rotor of the drive motor 9; and the third sun gear 17 is fixedly mounted on the outside of the output shaft 16.

[0066] The present invention discloses a first-gear transmission method for a multi-gear dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0067] S1: Make the generator 2, drive motor 9 and engine all work, make the first clutch 7 and the second brake 14 disengaged, and make the second clutch 8 and the first brake 13 engaged.

[0068] S2: Start the engine to drive input shaft 1 to rotate;

[0069] S3: Input shaft 1 drives the first planetary carrier 5 to rotate;

[0070] S4: Since the gearbox housing fixes the first gear ring 6, the first planet carrier 5 drives the first planet gear 4 to rotate;

[0071] S5: The first planetary gear 4 drives the first sun gear 3 to rotate;

[0072] S6: The first sun gear 3 drives the rotor of the generator 2 to rotate. After generating electricity, the generator 2 stores the energy in the battery to power the drive motor 9 when needed.

[0073] S7: Since the second clutch 8 is engaged, the power provided by the second clutch 8 and the power output by the drive motor 9 are combined to drive the second sun gear 10 to rotate.

[0074] S8: The second gear ring 12 is fixed in position by the first brake 13 in the engaged state, and the second sun gear 10 only drives the second step planetary gear 11 to rotate.

[0075] S9: The second-stage planetary gear 11 drives the third sun gear 17 to rotate;

[0076] S10: The third sun gear 17 drives the output shaft 16 to rotate, thus outputting power.

[0077] The present invention discloses a second-gear transmission method for a multi-gear dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0078] S1: Make the generator 2, drive motor 9 and engine all work, and make the first clutch 7, first brake 13 and second brake 14 all disengaged; make the second clutch 8 engaged.

[0079] S2: Start the engine to drive input shaft 1 to rotate;

[0080] S3: Input shaft 1 drives the first planetary carrier 5 to rotate;

[0081] S4: Since the gearbox housing fixes the first gear ring 6, the first planet carrier 5 drives the first planet gear 4 to rotate;

[0082] S5: The first planetary gear 4 drives the first sun gear 3 to rotate;

[0083] S6: The first sun gear 3 drives the rotor of the generator 2 to rotate. After generating electricity, the generator 2 stores the energy in the battery to power the drive motor 9 when needed.

[0084] S7: Since the second clutch 8 is engaged, the power provided by the second clutch 8 and the power output by the drive motor 9 are combined to drive the second sun gear 10 to rotate.

[0085] S8: The first brake 13 is in the disengaged state and does not restrict the rotation of the second ring gear 12. The second sun gear 10 simultaneously drives the second stepped planetary gear 11 and the second ring gear 12 to rotate.

[0086] S9: The second-stage planetary gear 11 drives the third sun gear 17 to rotate;

[0087] S10: The third sun gear 17 drives the output shaft 16 to rotate, thus outputting power.

[0088] The present invention discloses a three-speed transmission method for a multi-speed dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0089] S1: Both generator 2 and drive motor 9 are in working condition, the engine is not working, and the first clutch 7, second clutch 8, first brake 13 and second brake 14 are all in the engaged state.

[0090] S2: Start the drive motor 9 to drive the inner hub of the second clutch 8 and the second sun gear 10 to rotate synchronously;

[0091] S3: The second clutch 8 in the engaged state drives the first planetary carrier 5 to rotate through the first clutch 7 in the engaged state, and the input shaft 1 rotates freely. Since the gearbox housing fixes the first gear ring 6, the first planetary carrier 5 drives the first planetary gear 4 to rotate, the first planetary gear 4 drives the first sun gear 3 to rotate, and the first sun gear 3 drives the rotor of the generator 2 to rotate. After generating electricity, the generator 2 stores the energy in the battery to supply power to the drive motor 9 when needed.

[0092] S4: At the same time, the second sun gear 10 drives the second stepped planetary gear 11 to rotate. At this time, since the first brake 13 and the second brake 14 are engaged, the second gear ring 12 and the second planetary carrier 15 are fixed in position. The second stepped planetary gear 11 drives the third sun gear 17 to drive the output shaft 16 to rotate, and outputs power.

[0093] The present invention discloses a four-speed transmission method for a multi-speed dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0094] S1: The drive motor 9 is in the working state, the engine is not working, the second clutch 8 and the first brake 13 are both in the disengaged state; the first clutch 7 and the second brake 14 are both in the engaged state.

[0095] S2: Start the drive motor 9 to drive the second sun gear 10 to rotate. Since the second clutch 8 is in the disengaged state, the power transmission to the first planetary carrier 5 is cut off.

[0096] S3: At this time, since the first brake 13 is in the disengaged state and does not restrict the rotation of the second gear ring 12, while the second brake 14 is in the engaged state and the position of the second planetary carrier 15 is fixed, the second sun gear 10 simultaneously drives the second stepped planetary gear 11 and the second gear ring 12 to rotate, and the second stepped planetary gear 11 drives the third sun gear 17 to drive the output shaft 16 to rotate, thus outputting power.

[0097] The present invention discloses an EV1 gear transmission method for a multi-gear dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0098] S1: Put the drive motor 9 into operation, and put the first clutch 7, the second clutch 8 and the second brake 14 into disengagement; put the first brake 13 into engagement.

[0099] S2: The battery supplies power to the drive motor 9;

[0100] S3: Drive motor 9 drives the second sun gear 10 to rotate;

[0101] S4: At this time, the second gear ring 12 is fixed in position by the first brake 13 in the engaged state, while the second brake 14 is in the disengaged state and does not restrict the rotation of the second planetary carrier 15. The second stepped planetary gear 11 drives the third sun gear 17 to drive the output shaft 16 to rotate and output power.

[0102] The present invention discloses an EV 2-speed transmission method for a multi-gear dual-motor longitudinally mounted front-wheel-drive hybrid transmission mechanism, the method comprising the following steps:

[0103] S1: Put the drive motor 9 into operation, and put the first clutch 7, the second clutch 8 and the first brake 13 into disengagement; put the second brake 14 into engagement.

[0104] S2: The battery supplies power to the drive motor 9;

[0105] S3: Drive motor 9 drives the second sun gear 10 to rotate;

[0106] S4: At this time, the second planetary carrier 15 is fixed in position by the second brake 14 in the engaged state, while the first brake 13 is in the disengaged state and does not restrict the rotation of the second gear ring 12. The second stepped planetary gear 11 drives the third sun gear 17 to drive the output shaft 16 to rotate and output power.

[0107] This invention maintains a compact structure while comprehensively improving power, economy, and smoothness, solving the technical bottlenecks of existing hybrid transmissions in terms of high-speed economy, mode switching smoothness, and front-wheel drive layout adaptability.

[0108] 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 implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0109] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-gear dual-motor longitudinally-mounted front-drive hybrid transmission drive mechanism, characterized in that: It includes input shaft (1), generator (2), first clutch (7), second clutch (8), drive motor (9), first brake (13), second brake (14), output shaft (16), front planetary gear train and rear row stepped planetary gear train;The input end of the input shaft (1) is connected with the power system of the engine, and the outside of the input shaft (1) is sleeved with the front planetary gear train and the generator (2), the rotor of the generator (2) is connected with the front planetary gear train;The front planetary gear train is fixedly connected with the outer disc of the first clutch (7) and the outer disc of the second clutch (8), the inner hub of the first clutch (7) is connected with the rear row stepped planetary gear train, the inner hub of the second clutch (8) and the rear row stepped planetary gear train are fixedly connected with the rotor of the drive motor (9);The rear row stepped planetary gear train is fixedly connected with the moving end of the first brake (13), the moving end of the second brake (14) and the input end of the output shaft (16), the stator of the generator (2), the stator of the drive motor (9), the fixed end of the first brake (13) and the fixed end of the second brake (14) are fixedly connected with the transmission housing.

2. The multi-gear dual-motor longitudinally-mounted front-drive hybrid transmission drive mechanism according to claim 1, characterized in that: The front planetary gear train includes first sun gear (3), first planetary gear (4), first planet carrier (5) and first ring gear (6);The first sun gear (3) and the first planet carrier (5) are sleeved on the outside of the input shaft (1), the first planet carrier (5) is fixedly connected with the input shaft (1), and the first planet carrier (5) is fixedly connected with the outer disc of the first clutch (7), the first planet carrier (5) is provided with the first planetary gear (4), the first planetary gear (4) is meshed with the first sun gear (3) and the first ring gear (6), the first ring gear (6) is fixedly installed on the transmission housing, and the first sun gear (3) is fixedly connected with the rotor of the generator (2).

3. The multi-gear dual-motor longitudinally-mounted front-drive hybrid transmission drive mechanism according to claim 2, characterized in that: The rear row stepped planetary gear train includes second sun gear (10), second stepped planetary gear (11), second ring gear (12), second planet carrier (15) and third sun gear (17);The inner hub of the first clutch (7) is fixedly connected with the second planet carrier (15), the second planet carrier (15) is provided with the second stepped planetary gear (11), and the second planet carrier (15) is fixedly connected with the moving end of the second brake (14), one end of the second stepped planetary gear (11) is meshed with the third sun gear (17), the other end of the second stepped planetary gear (11) is meshed with the second sun gear (10) and the second ring gear (12), the second ring gear (12) is fixedly connected with the moving end of the first brake (13), the second sun gear (10) is fixedly connected with the rotor of the drive motor (9), and the third sun gear (17) is fixedly sleeved on the outside of the output shaft (16).

4. A method for transmitting power in one gear of a multi-gear double-motor longitudinally-placed front-drive hybrid transmission mechanism according to any one of claims 1-3, characterized in that: The method comprises the following steps: S1: make the generator (2), drive motor (9) and engine are in working condition, make the first clutch (7) and second brake (14) are in the separation state; make the second clutch (8) and the first brake (13) are in the combined state; S2: start the engine drive input shaft (1) rotation; S3: input shaft (1) drive first planetary carrier (5) rotation; S4: because the first gear (6) is fixed by the transmission housing, the first planetary carrier (5) drive first planetary gear (4) rotation; S5: the first planetary gear (4) drive first sun gear (3) rotation; S6: the first sun gear (3) drive the rotor of the generator (2) rotation, the generator (2) generates electricity after the energy storage to the battery in need for drive motor (9) power supply; S7: because the second clutch (8) is in the combined state, the first planetary carrier (5) through the power provided by the second clutch (8) and the power output by the drive motor (9) after the confluence drive second sun gear (10) rotation; S8: the second gear (12) is position fixed by the first brake (13) in the combined state, the second sun gear (10) only drive second stepped planetary gear (11) rotation; S9: the second stepped planetary gear (11) drive third sun gear (17) rotation; S10: the third sun gear (17) drive output shaft (16) rotation, power output.

5. The two-gear transmission method of the multi-gear double-motor longitudinally-placed front-drive hybrid transmission mechanism according to any one of claims 1-3, characterized in that: The method comprises the following steps: S1: make the generator (2), drive motor (9) and engine are in working condition, make the first clutch (7), the first brake (13) and the second brake (14) are in the separation state; make the second clutch (8) is in the combined state; S2: start the engine drive input shaft (1) rotation; S3: input shaft (1) drive first planetary carrier (5) rotation; S4: because the first gear (6) is fixed by the transmission housing, the first planetary carrier (5) drive first planetary gear (4) rotation; S5: the first planetary gear (4) drive first sun gear (3) rotation; S6: the first sun gear (3) drive the rotor of the generator (2) rotation, the generator (2) generates electricity after the energy storage to the battery in need for drive motor (9) power supply; S7: because the second clutch (8) is in the combined state, the first planetary carrier (5) through the power provided by the second clutch (8) and the power output by the drive motor (9) after the confluence drive second sun gear (10) rotation; S8: the first brake (13) is in the separation state without limiting the rotation of the second gear (12), the second sun gear (10) drive second stepped planetary gear (11) and second gear (12) rotation at the same time; S9: the second stepped planetary gear (11) drive third sun gear (17) rotation; S10: the third sun gear (17) drive output shaft (16) rotation, power output.

6. A three-gear transmission method of the multi-gear double-motor longitudinally-placed front-drive hybrid transmission mechanism according to any one of claims 1-3, characterized in that: The method comprises the following steps: S1: the generator (2) and the drive motor (9) are in working state, the engine is not working, the first clutch (7), the second clutch (8), the first brake (13) and the second brake (14) are in the combined state; S2: the drive motor (9) is started to drive the inner hub of the second clutch (8) and the second sun gear (10) to rotate synchronously; S3: the second clutch (8) in the combined state drives the first planetary carrier (5) to rotate through the first clutch (7) in the combined state, the input shaft (1) is idling, and since the first ring gear (6) is fixed by the transmission housing, the first planetary carrier (5) drives the first planetary gear (4) to rotate, the first planetary gear (4) drives the first sun gear (3) to rotate, the first sun gear (3) drives the rotor of the generator (2) to rotate, and the generator (2) generates electricity and stores the energy into the battery to supply power to the drive motor (9) when needed; S4: at the same time, the second sun gear (10) drives the second stepped planetary gear (11) to rotate, and at this time, since the first brake (13) and the second brake (14) are in the combined state, the second ring gear (12) and the second planetary carrier (15) are fixed in position, the second stepped planetary gear (11) drives the third sun gear (17) to drive the output shaft (16) to rotate, and the power is output.

7. A four-gear transmission method of the multi-gear double-motor longitudinally-placed front-drive hybrid transmission mechanism according to any one of claims 1-3, characterized in that: The method comprises the following steps: S1: the drive motor (9) is in working state, the engine is not working, the second clutch (8) and the first brake (13) are in the separated state; the first clutch (7) and the second brake (14) are in the combined state; S2: the drive motor (9) is started to drive the second sun gear (10) to rotate, and since the second clutch (8) is in the separated state, the power transmission to the first planetary carrier (5) is cut off; S3: at this time, since the first brake (13) is in the separated state and does not limit the rotation of the second ring gear (12), and the second brake (14) is in the combined state, the second planetary carrier (15) is fixed in position, the second sun gear (10) drives the second stepped planetary gear (11) and the second ring gear (12) to rotate, and the second stepped planetary gear (11) drives the third sun gear (17) to drive the output shaft (16) to rotate, and the power is output.

8. A transmission method of EV1 gear of the multi-gear double-motor longitudinally-placed front-drive hybrid transmission mechanism according to any one of claims 1-3, characterized in that: The method comprises the following steps: S1: the drive motor (9) is in working state, the first clutch (7), the second clutch (8) and the second brake (14) are in the separated state; the first brake (13) is in the combined state; S2: the battery supplies power to the drive motor (9); S3: the drive motor (9) drives the second sun gear (10) to rotate; S4: at this time, the second ring gear (12) is fixed in position through the first brake (13) in the combined state, and the second brake (14) is in the separated state and does not limit the rotation of the second planetary carrier (15), the second stepped planetary gear (11) drives the third sun gear (17) to drive the output shaft (16) to rotate, and the power is output.

9. A method of EV2 transmission of a multi-gear dual-motor longitudinally-mounted front-drive hybrid transmission mechanism according to any one of claims 1-3, characterized in that: The method comprises the following steps: S1: the driving motor (9) is in working state, the first clutch (7), the second clutch (8) and the first brake (13) are all in separation state; the second brake (14) is in combination state; S2: the battery supplies power to the driving motor (9); S3: the driving motor (9) drives the second sun gear (10) to rotate; S4: at this time, the second carrier (15) is position-fixed through the second brake (14) in combination state, the first brake (13) is in separation state and does not limit the rotation of the second ring gear (12), the second stepped planetary gear (11) drives the third sun gear (17) to drive the output shaft (16) to rotate, and the power is output.

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