Transmission system and automobile

Abstract

The present application relates to the technical field of vehicle engineering, in particular to a transmission system and a car. The transmission system provided by the present application comprises: first, second and third driving members, first and second small sun gears, a large sun gear, first and second short planetary gears, a long planetary gear, a ring gear and a planet carrier; the first small sun gear, the first short planetary gear, the long planetary gear and the ring gear are sequentially engaged; the large sun gear, the long planetary gear and the ring gear are sequentially engaged; the second small sun gear, the second short planetary gear, the long planetary gear and the ring gear are sequentially engaged; the first driving member is connected with the first small sun gear, the second driving member is connected with the planet carrier, and the third driving member is connected with the second small sun gear. The left side can serve as a Ravigneaux planetary system, and the right side can also serve as a Ravigneaux planetary system. When in use, the ring gear, the planet carrier and the large sun gear are braked, so that the gear set has multiple output gears, and the three planetary gears are integrated, so that the gear set structure is simpler.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle engineering, in particular to a transmission system and a vehicle. BACKGROUND

[0002] The hybrid electric vehicle refers to a vehicle whose driving system is composed of two or more single driving systems which can operate simultaneously, and the driving power of the vehicle is provided by the single driving systems alone or jointly according to the actual driving state of the vehicle.

[0003] Generally, the power source of the hybrid electric vehicle is an internal combustion engine and an electric motor, and the low-speed large-torque characteristics of the electric motor compensate for the low-speed torque deficiency of the internal combustion engine, especially a turbocharged internal combustion engine, so that the power performance of the vehicle is fully guaranteed. In the same level of vehicle models, the hybrid electric technology can match a small displacement engine without reducing the power performance, and the fuel consumption rate and emission performance are also greatly improved.

[0004] However, the internal combustion engine and the electric motor of the current hybrid transmission generally only have one gear, resulting in a single transmission ratio and being unable to better improve the working efficiency of the internal combustion engine and the electric motor. SUMMARY

[0005] (I) The problem to be solved by the present application is that the transmission ratio of the existing hybrid transmission is single, and the working efficiency of the internal combustion engine and the electric motor cannot be better improved.

[0006] (II) Technical scheme

[0007] In order to solve the above technical problems, one embodiment of the present application provides a transmission system, comprising: a first driving member, a second driving member, a third driving member and a gear set.

[0008] The gear set comprises a first small sun gear, a second small sun gear, a large sun gear, a first short planetary gear, a second short planetary gear, a long planetary gear, a ring gear and a planetary carrier.

[0009] The first short planetary gear, the second short planetary gear and the long planetary gear are all rotationally connected to the planetary carrier.

[0010] The first small sun gear, the first short planetary gear, the long planetary gear and the ring gear are sequentially engaged.

[0011] The large sun gear, the long planetary gear and the ring gear are sequentially engaged.

[0012] The second small sun gear, the second short planetary gear, the long planetary gear and the ring gear are sequentially engaged.

[0013] The first driving member is in transmission connection with the first small sun gear, the second driving member is in transmission connection with the planet carrier, and the third driving member is in transmission connection with the second small sun gear.

[0014] Further, the first driving member is a first motor, the second driving member is a second motor, and the third driving member is an engine.

[0015] Further, a first clutch for controlling on-off is arranged between the second driving member and the planet carrier.

[0016] Further, a second clutch for controlling on-off is arranged between the third driving member and the second small sun gear.

[0017] Further, the transmission system further comprises a first brake and a second brake.

[0018] The first brake is used for braking the planet carrier.

[0019] The second brake is used for braking the large sun gear.

[0020] Further, the first motor and the second motor are located on the same side of the gear set, and the engine is located on the side opposite to the first motor and the second motor.

[0021] Further, the rotor of the second motor is hollow.

[0022] The output shaft of the first motor is in transmission connection with the first small sun gear through the rotor of the second motor.

[0023] Further, the transmission system further comprises a first gear.

[0024] The first gear is in transmission connection with the ring gear, and power is outputted outward through the first gear.

[0025] Further, the transmission system further comprises a second gear, a third gear and a connecting shaft.

[0026] The second gear and the third gear are arranged on the connecting shaft.

[0027] The second gear is in meshing connection with the first gear, and the third gear is in transmission connection with the axle.

[0028] Another aspect of the embodiment of the present application further provides an automobile comprising the transmission system according to any one of the above-mentioned embodiments.

[0029] The present application has the following beneficial effects:

[0030] The transmission system provided by the application comprises a first driving member, a second driving member, a third driving member and a gear set; the gear set comprises a first small sun gear, a second small sun gear, a large sun gear, a first short planetary gear, a second short planetary gear, a long planetary gear, a ring gear and a planet carrier; the first short planetary gear, the second short planetary gear and the long planetary gear are all rotationally connected to the planet carrier; the first small sun gear, the first short planetary gear, the long planetary gear and the ring gear are sequentially meshed; the large sun gear, the long planetary gear and the ring gear are sequentially meshed; the second small sun gear, the second short planetary gear, the long planetary gear and the ring gear are sequentially meshed; the first driving member is in transmission connection with the first small sun gear, the second driving member is in transmission connection with the planet carrier, and the third driving member is in transmission connection with the second small sun gear.

[0031] The gear set is composed of three planetary rows, the left two planetary rows can be regarded as a Ravigneaux planetary system, the right two planetary rows can also be regarded as a Ravigneaux planetary system, and when in use, the gear set has multiple output gears through the braking of the ring gear, the planet carrier and the large sun gear, and the three planetary rows are integrated, so that the gear set structure is simpler, and the working efficiency of the internal combustion engine and the motor can be better adjusted compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 The structural schematic diagram of the transmission system provided by the embodiment of the application.

[0034] Icon: 11-first driving member; 12-second driving member; 13-third driving member;

[0035] 21-first small sun gear; 22-second small sun gear; 23-large sun gear; 24-first short planetary gear; 25-second short planetary gear; 26-long planetary gear; 27-ring gear; 28-planet carrier;

[0036] 31-first brake; 32-second brake; 33-first clutch; 34-second clutch;

[0037] 41-first gear; 42-second gear; 43-third gear; 44-differential gear; 45-axle. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be clearly and completely described below in combination with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0039] An embodiment of one aspect of the present application provides a transmission system, which comprises a first driving member 11, a second driving member 12, a third driving member 13 and a gear set. Figure 1 As shown in the figure, the transmission system comprises a first driving member 11, a second driving member 12, a third driving member 13 and a gear set. The gear set comprises a first small sun gear 21, a second small sun gear 22, a large sun gear 23, a first short planetary gear 24, a second short planetary gear 25, a long planetary gear 26, a ring gear 27 and a planet carrier 28. The first short planetary gear 24, the second short planetary gear 25 and the long planetary gear 26 are all rotationally connected to the planet carrier 28. The first small sun gear 21, the first short planetary gear 24, the long planetary gear 26 and the ring gear 27 are sequentially meshed. The large sun gear 23, the long planetary gear 26 and the ring gear 27 are sequentially meshed. The second small sun gear 22, the second short planetary gear 25, the long planetary gear 26 and the ring gear 27 are sequentially meshed. The first driving member 11 is in driving connection with the first small sun gear 21. The second driving member 12 is in driving connection with the planet carrier 28. The third driving member 13 is in driving connection with the second small sun gear 22.

[0040] In the embodiment, the transmission system is composed of a first driving member 11, a second driving member 12, a third driving member 13 and a gear set. The first driving member 11, the second driving member 12 and the third driving member 13 are all power output components. The first driving member 11, the second driving member 12 and the third driving member 13 are all in driving connection with the gear set. Under the action of the gear set, the first driving member 11, the second driving member 12 and the third driving member 13 cooperate with each other, so that the transmission system has multiple output gears and working modes.

[0041] In the embodiment, the gear set comprises a first small sun gear 21, a second small sun gear 22, a large sun gear 23, a first short planetary gear 24, a second short planetary gear 25, a long planetary gear 26 and a planet carrier 28. The first short planetary gear 24, the second short planetary gear 25 and the long planetary gear 26 are all provided in multiple numbers. For example, the first short planetary gear 24, the second short planetary gear 25 and the long planetary gear 26 are all provided in two numbers.

[0042] In the embodiment, the gear set is composed of three groups of planetary rows, and the three groups of planetary rows share the same ring gear 27.

[0043] Specifically, the first small sun gear 21, the first short planetary gear 24, the long planetary gear 26 and the ring gear 27 form the first planetary row. The first small sun gear 21 is located in the center, the ring gear 27 is located at the outermost side, and the first small sun gear 21 and the ring gear 27 are sequentially connected through the first short planetary gear 24 and the long planetary gear 26.

[0044] The large sun gear 23, the long planetary gear 26 and the ring gear 27 form the second planetary row. The large sun gear 23 is located in the center, the ring gear 27 is located at the outermost side, and the large sun gear 23 and the ring gear 27 are connected through the long planetary gear 26.

[0045] The second small sun gear 22, the second short planetary gear 25, the long planetary gear 26 and the ring gear 27 form the third planetary row. The second small sun gear 22 is located in the center, the ring gear 27 is located at the outermost side, and the second small sun gear 22 and the ring gear 27 are sequentially connected through the second short planetary gear 25 and the long planetary gear 26.

[0046] In the embodiment, the first planetary row and the second planetary row can be regarded as a Ravigneaux planetary system, and the third planetary row and the second planetary row can also be regarded as a Ravigneaux planetary system. In the embodiment, the first small sun gear 21, the second small sun gear 22, the large sun gear 23, the first short planetary gear 24, the second short planetary gear 25, the long planetary gear 26 and the planetary carrier 28 are combined to form a new Ravigneaux planetary system.

[0047] In the embodiment, the first driving member 11, the second driving member 12 and the third driving member 13 all have output shafts. The output shaft of the first driving member 11 is in transmission connection with the first small sun gear 21, specifically, the first small sun gear 21 can be arranged on the output shaft of the first driving member 11; the second driving member 12 is in transmission connection with the planetary carrier 28, specifically, a shaft coupling or the like can be arranged between the output shaft of the second driving member 12 and the planetary carrier 28; the output shaft of the third driving member 13 is in transmission connection with the second small sun gear 22, specifically, the second small sun gear 22 can be arranged on the output shaft of the third driving member 13.

[0048] The transmission system provided by the embodiment has the following advantages: the gear set is composed of three planetary rows, the left two planetary rows can be regarded as a Ravigneaux planetary system, the right two planetary rows can also be regarded as a Ravigneaux planetary system, during use, the gear set can have multiple output gears through braking of the ring gear 27, the planetary carrier 28 and the large sun gear 23, and the three planetary rows are integrated, so that the gear set has a simpler structure, and the working efficiency of the internal combustion engine and the electric motor can be better adjusted compared with the prior art.

[0049] The transmission system provided by the embodiment has the following advantages: the gear set is composed of three planetary rows, the left two planetary rows can be regarded as a Ravigneaux planetary system, the right two planetary rows can also be regarded as a Ravigneaux planetary system, during use, the gear set can have multiple output gears through braking of the ring gear 27, the planetary carrier 28 and the large sun gear 23, and the three planetary rows are integrated, so that the gear set has a simpler structure, and the working efficiency of the internal combustion engine and the electric motor can be better adjusted compared with the prior art.

[0050] In the embodiment, the first driving member 11 and the second driving member 12 are both electric motors, and for the convenience of description, the first driving member 11 is a first motor, and the second driving member 12 is a second motor. The third driving member 13 is an engine.

[0051] It can be understood that, in the embodiment, the first driving member 11 and the second driving member 12 can be internal combustion engines, and the third driving member 13 can also be an electric motor.

[0052] In the embodiment, by setting the first driving member 11 and the second driving member 12 as electric motors and setting the third driving member 13 as an internal combustion engine, the transmission system can realize three driving modes of pure electric mode, pure oil mode and hybrid mode.

[0053] The transmission system provided by the embodiment of the application comprises a first driving member 11, a second driving member 12 and a third driving member 13. Figure 1 As shown in the figure, a first clutch 33 for controlling on-off is arranged between the second driving member 12 and the planet carrier 28.

[0054] In the embodiment, the first clutch 33 is arranged between the second driving member 12 and the planet carrier 28, and the first clutch 33 is used for controlling on-off of power transmission between the second driving member 12 and the planet carrier 28. When the second driving member 12 does not work and the planet carrier 28 rotates, the second driving member 12 can be disconnected from the planet carrier 28 through the first clutch 33, so as to avoid idling of the second driving member 12 and thus power waste and improve the service life of the second driving member 12.

[0055] The transmission system provided by the embodiment of the application comprises a first driving member 11, a second driving member 12 and a third driving member 13. Figure 1 As shown in the figure, a second clutch 34 for controlling on-off is arranged between the third driving member 13 and the second small sun gear 22.

[0056] In the embodiment, the second clutch 34 is arranged between the third driving member 13 and the second small sun gear 22, and the second clutch 34 is used for controlling on-off of power transmission between the third driving member 13 and the second small sun gear 22. When the third driving member 13 does not work and the second small sun gear 22 rotates, the third driving member 13 can be disconnected from the second small sun gear 22 through the second clutch 34, so as to avoid idling of the third driving member 13 and thus power waste and improve the service life of the third driving member 13.

[0057] The transmission system provided by the embodiment of the application comprises a first driving member 11, a second driving member 12 and a third driving member 13. Figure 1 As shown in the figure, the transmission system further comprises a first brake 31 and a second brake 32; the first brake 31 is used for braking the planet carrier 28; and the second brake 32 is used for braking the large sun gear 23.

[0058] In the embodiment, the transmission system further comprises a first brake 31 and a second brake 32, wherein the first brake 31 is used to brake the planet carrier 28, and the second brake 32 is used to brake the big sun gear 23. By arranging the first brake 31 and the second brake 32, the gear set can have multiple output gears, and the specific braking mode is described in detail below.

[0059] In the embodiment, the brake and the clutch are both common brakes and clutches in the market, and the structure and principle thereof are well-known in the art, which will not be described herein.

[0060] The transmission system provided by the embodiment of the application, as shown in Figure 1 The first motor and the second motor are located on the same side of the gear set, and the engine is located on the side opposite to the first motor and the second motor.

[0061] In the embodiment, the gear set has two opposite sides, which are referred to as the left side and the right side for convenience of description.

[0062] The first motor and the second motor are located on the same side of the gear set, and the engine is located on the side opposite to the first motor and the second motor, that is, the first motor and the second motor are arranged on the left side of the gear set, and the engine is arranged on the right side of the gear set.

[0063] In the embodiment, by arranging the first motor and the second motor on the left side and arranging the engine on the right side, the arrangement of the transmission system on the whole vehicle is facilitated.

[0064] The transmission system provided by the embodiment of the application, as shown in Figure 1 The rotor of the second motor is hollow, and the output shaft of the first motor is in transmission connection with the first small sun gear 21 through the rotor of the second motor.

[0065] In the embodiment, the rotor of the second motor is hollow, and the output shaft of the first motor is in transmission connection with the first small sun gear 21 through the rotor of the second motor.

[0066] In the embodiment, by hollowing the rotor of the second motor, the output shaft of the first motor can pass through the second motor, so as to reduce the space occupied by the transmission system.

[0067] Optionally, in the embodiment, a bearing is arranged between the output shaft of the first motor and the rotor of the second motor.

[0068] The transmission system provided by the embodiment of the application, as shown in Figure 1 Further comprises a first gear 41, the first gear 41 is in transmission connection with the gear ring 27, and power is outputted outward through the first gear 41.

[0069] In the embodiment, the first gear 41 is in driving connection with the ring gear 27, and the ring gear 27 is an inner ring gear 27, and the ring gear 27 can be an engaging ring gear 27, and the outer edge of the ring gear 27 forms the first gear 41.

[0070] In the embodiment, the ring gear 27 can be in driving connection with the first gear 41 by setting a special-shaped shaft or the like.

[0071] The transmission system provided by the embodiment of the application comprises the first gear 41, the second gear 42 and the third gear 43. Figure 1 As shown in the figure, the transmission system further comprises a second gear 42 and a third gear 43, and the second gear 42 and the third gear 43 are arranged on the connecting shaft; the second gear 42 is in engagement with the first gear 41, and the third gear 43 is in driving connection with the axle 45.

[0072] In the embodiment, the torque output by the first motor, the second motor and the engine is finally output to the axle 45. The transmission system further comprises the second gear 42 and the third gear 43. The first gear 41 is in engagement with the second gear 42, the second gear 42 and the third gear 43 are coaxial, and the third gear 43 is in engagement with the differential gear 44 on the axle 45.

[0073] Optionally, the diameter of the second gear 42 is greater than the diameter of the third gear 43.

[0074] The transmission system provided by the embodiment of the application has multiple output gears.

[0075] In the pure electric mode, there are three output gears, and in the hybrid mode, there are four output gears.

[0076] Gear one

[0077] In this mode, the first motor is used as a power input component. When working, the first brake 31 is braked, and the first clutch 33 and the second clutch 34 are disconnected. The first brake 31 is braked, that is, in this mode, the planet carrier 28 remains stationary. The first motor rotates, the first small sun gear 21 rotates with the first motor, and further drives the first short planetary gear 24, the long planetary gear 26 and the ring gear 27 to rotate, and finally the power is transmitted to the axle 45 by the first gear 41, the second gear 42 and the third gear 43.

[0078] In this mode, the second short planetary gear 25 and the second small sun gear 22 also rotate, but since the second clutch 34 is disconnected, the engine does not rotate with the second small sun gear 22.

[0079] Gear two

[0080] In this mode, the second motor acts as the power input component. When working, the second brake 32 is braked, the first clutch 33 is closed, and the second clutch 34 is disconnected. The second clutch 34 is braked, that is, in this mode, the big sun gear 23 remains stationary. The second motor rotates, the planet carrier 28 rotates with the second motor, the long planet gears 26 on the planet carrier 28 rotate around the big sun gear 23, but since there is a speed difference between the inner and outer lines of the long planet gears 26, the ring gear 27 will rotate under the action of the long planet gears 26. Finally, the power is transmitted to the axle 45 by the first gear 41, the second gear 42, and the third gear 43.

[0081] Gear three

[0082] In this mode, the first motor and the second motor act as power input components. When working, the first clutch 33 is closed, and the second clutch 34 is disconnected. The first motor and the second motor rotate, the first motor drives the first small sun gear 21 to rotate, and in turn drives the first short planet gear 24, the long planet gear 26, and the ring gear 27 to rotate; the second motor rotates, the second motor drives the planet carrier 28 to rotate, the planet carrier 28 drives the long planet gear 26 to rotate around the big sun gear 23, and drives the first short planet gear 24 to rotate around the first small sun gear 21; since there is a speed difference between the inner and outer lines of the long planet gears 26, the ring gear 27 will rotate under the action of the long planet gears 26. The power is transmitted to the axle 45 by the ring gear 27, the first gear 41, the second gear 42, and the third gear 43.

[0083] In this mode, the second short planet gear 25 and the second small sun gear 22 will also rotate, but since the second clutch 34 is disconnected, the engine will not rotate with the second small sun gear 22.

[0084] The above-mentioned gear one to gear three are output gears under pure electric mode driving.

[0085] Gear four

[0086] In this mode, the first motor and the engine act as power input components. When working, the first brake 31 is braked, the first clutch 33 is disconnected, and the second clutch 34 is closed. The first brake 31 is braked, that is, in this mode, the planet carrier 28 remains stationary. The first motor rotates, the first motor drives the first small sun gear 21 to rotate, and in turn drives the first short planet gear 24, the long planet gear 26, and the ring gear 27 to rotate. The engine rotates, the engine drives the second small sun gear 22 to rotate, and in turn drives the second short planet gear 25, the long planet gear 26, and the ring gear 27 to rotate. Finally, the power is transmitted to the axle 45 by the first gear 41, the second gear 42, and the third gear 43.

[0087] Gear five

[0088] In this mode, the first motor and the engine are the power input components. When working, the second brake 32 is braked, the first clutch 33 is disconnected, and the second clutch 34 is connected. The second brake 32 is braked, that is, the big sun gear 23 remains stationary in this mode. The first motor rotates, the first motor drives the first small sun gear 21 to rotate, and further drives the first short planetary gear 24, the long planetary gear 26 and the ring gear 27 to rotate together. The engine rotates, the engine drives the second small sun gear 22 to rotate, and further drives the second short planetary gear 25, the long planetary gear 26 and the ring gear 27 to rotate together. Finally, the power is transmitted to the axle 45 by the first gear 41, the second gear 42 and the third gear 43.

[0089] Gear six

[0090] In this mode, the second motor and the engine are the power input components. When working, the second brake 32 is braked, and the first clutch 33 and the second clutch 34 are connected. The second brake 32 is braked, that is, the big sun gear 23 remains stationary. The second motor rotates, the second motor drives the carrier 28 to rotate, the carrier 28 drives the long planetary gear 26 to rotate around the big sun gear 23, and drives the first short planetary gear 24 to rotate around the first small sun gear 21; since there is an inner and outer line speed difference in the long planetary gear 26, the ring gear 27 will rotate under the action of the long planetary gear 26. The engine rotates, the engine drives the second small sun gear 22 to rotate, and further drives the second short planetary gear 25, the long planetary gear 26 and the ring gear 27 to rotate together. Finally, the power is transmitted to the axle 45 by the first gear 41, the second gear 42 and the third gear 43.

[0091] Gear seven

[0092] In this mode, the first motor, the second motor and the engine are the power input components. When working, the second brake 32 is braked, and the first clutch 33 and the second clutch 34 are connected. The second brake 32 is braked, that is, the big sun gear 23 remains stationary. The first motor rotates, the first motor drives the first small sun gear 21 to rotate, and further drives the first short planetary gear 24, the long planetary gear 26 and the ring gear 27 to rotate together. The second motor rotates, the second motor drives the carrier 28 to rotate, the carrier 28 drives the long planetary gear 26 to rotate around the big sun gear 23, and drives the first short planetary gear 24 to rotate around the first small sun gear 21; since there is an inner and outer line speed difference in the long planetary gear 26, the ring gear 27 will rotate under the action of the long planetary gear 26. The engine rotates, the engine drives the second small sun gear 22 to rotate, and further drives the second short planetary gear 25, the long planetary gear 26 and the ring gear 27 to rotate together. Finally, the power is transmitted to the axle 45 by the first gear 41, the second gear 42 and the third gear 43.

[0093] The gear four to gear seven are parallel driving of the first motor, the second motor and the engine, that is, the hybrid mode, in which mode, the power source speed is constant, and the two motors are speed-adapted to the engine.

[0094] The application also provides a vehicle comprising the transmission system according to any one of the above embodiments.

[0095] In the description of the present application, it should be noted that the terms "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0096] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "communication", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be direct communication, or indirect communication through intermediate medium, or communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0097] The above is only the preferred embodiment of the present application, and is not intended to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A transmission system characterized by, The transmission system comprises: a first driving member (11), a second driving member (12), a third driving member (13) and a gear set; the gear set comprises a first small sun gear (21), a second small sun gear (22), a large sun gear (23), a first short planetary gear (24), a second short planetary gear (25), a long planetary gear (26), a ring gear (27) and a planet carrier (28); the first short planetary gear (24), the second short planetary gear (25) and the long planetary gear (26) are all rotationally connected to the planet carrier (28); the first small sun gear (21), the first short planetary gear (24), the long planetary gear (26) and the ring gear (27) are in meshing sequence; the large sun gear (23), the long planetary gear (26) and the ring gear (27) are in meshing sequence; the second small sun gear (22), the second short planetary gear (25), the long planetary gear (26) and the ring gear (27) are in meshing sequence; the first driving member (11) is in driving connection with the first small sun gear (21), the second driving member (12) is in driving connection with the planet carrier (28), and the third driving member (13) is in driving connection with the second small sun gear (22); a first clutch (33) for controlling on-off is arranged between the second driving member (12) and the planet carrier (28); a second clutch (34) for controlling on-off is arranged between the third driving member (13) and the second small sun gear (22); a first brake (31) and a second brake (32) are further included; the first brake (31) is used for braking the planet carrier (28); the second brake (32) is used for braking the large sun gear (23).

2. The transmission system of claim 1, wherein, The first driving member (11) is a first motor, the second driving member (12) is a second motor, and the third driving member (13) is an engine.

3. The transmission system of claim 2, wherein, The first motor and the second motor are located on the same side of the gear set, and the engine is located on the side opposite to the first motor and the second motor.

4. The transmission system of claim 2, wherein, The rotor of the second motor is hollowly arranged; the output shaft of the first motor is in driving connection with the first small sun gear (21) through the rotor of the second motor.

5. The transmission system of claim 1, wherein, a first gear (41) is further included; the first gear (41) is in driving connection with the ring gear (27), and power is outputted outward through the first gear (41).

6. The transmission system of claim 5, wherein, a second gear (42), a third gear (43) and a connecting shaft are further included; the second gear (42) and the third gear (43) are both arranged on the connecting shaft; the second gear (42) is in meshing with the first gear (41), and the third gear (43) is in driving connection with an axle (45).

7. An automobile characterized by comprising: The transmission system comprises the transmission system according to any one of claims 1 to 6.

Images