Speed change device and power system

Abstract

The invention relates to the technical field of transmissions, and discloses a speed change device and a power system. A second input shaft; a third input shaft; the first output shaft is in transmission fit with the first input shaft and the second input shaft at the same time through a transmission assembly and is in transmission fit with the third input shaft; the planetary speed reduction part is provided with a transmission adjusting assembly and a first planet wheel assembly and a second planet wheel assembly which are in transmission connection, the first planet wheel assembly is provided with a power input part, the second planet wheel assembly is provided with a power output part, and the power input part is in transmission connection with the first output shaft; power input by the speed change device is combined with the planetary speed reduction part in a planetary power dividing mode to achieve power transmission, more gears can be selected, the gear use efficiency of the speed change device is effectively improved, an engine can continuously work in a high-efficiency interval, the efficiency of a power system is improved, and oil consumption is reduced; and in addition, the working stability and reliability of the speed change device under the heavy load condition are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and in particular to a transmission device and a power system. Background Art

[0002] With the continuous development of new energy technologies, traditional working vehicles that use engines as their core power are gradually moving towards electric and hybrid. By integrating traditional fuel technology and electric technology, hybrid working vehicles not only improve the economy and environmental protection of vehicles, but also enhance the adaptability and work efficiency of vehicles under various working conditions.

[0003] At present, existing hybrid vehicles usually use automatic transmissions that are suitable for low loads. The automatic transmission has an engine power input shaft and a motor power input shaft. The power of the two input shafts is output after coupling through a series of transmission gears and a planetary gear system. Although the hybrid effect can be achieved, this form of automatic transmission is a single-speed transmission and can only be used in low-load environments. Hybrid working vehicles have a large load and usually operate under complex road conditions. This form of automatic transmission is difficult to meet the use requirements of hybrid working vehicles. Summary of the invention

[0004] In view of this, the present invention provides a transmission device and a power system to solve the problem that the transmission of the existing hybrid system is difficult to effectively meet the use requirements of the hybrid working vehicle.

[0005] In a first aspect, the present invention provides a speed change device, comprising: a first input shaft, adapted to be connected to an engine through a power clutch; a second input shaft, adapted to be connected to a first power motor; a third input shaft, adapted to be connected to a second power motor; a first output shaft, which is simultaneously matched with the first input shaft and the second input shaft through a transmission assembly, and the first output shaft is matched with the third input shaft; the transmission assembly comprises a planetary transmission part, a first clutch and a second clutch, the planetary transmission part comprises a transmission sun gear, a transmission planet gear, a transmission planet carrier, and a transmission ring gear that are matched with each other, the first input shaft is detachably connected with the transmission ring gear through the first clutch, the transmission sun gear is matched with the second input shaft, the transmission planet carrier is matched with the first output shaft, and the second clutch is used to fix the transmission ring gear separately; a planetary reduction part, comprising a transmission adjustment component and a first planetary wheel assembly and a second planetary wheel assembly that are connected with each other, the first planetary wheel assembly having a power input part, the second planetary wheel assembly having a power output part, the power input part being connected with the first output shaft, the transmission adjustment component being adapted to adjust the transmission matching state of the first planetary wheel assembly and the second planetary wheel assembly, and the planetary reduction part having a first transmission state, a second transmission state, and a third transmission state with a gradually decreasing transmission ratio.

[0006] Beneficial effects: The power input by the transmission device is combined with the planetary reduction unit in the form of planetary power splitting to realize power transmission. The planetary reduction unit can realize three-speed ratio by adjusting the transmission state, so that the transmission device can realize pure electric three-speed and hybrid three-speed transmission. Since there are many selectable gears, the hybrid working vehicle can flexibly select the required gear for power output according to needs, which can effectively improve the gear utilization efficiency of the transmission device; the power of the first input shaft and the second input shaft is coupled through the planetary transmission unit and output through the transmission planetary carrier. Since the speed of the transmission planetary carrier is jointly determined by the speed of the first input shaft and the second input shaft, when the whole vehicle works in a hybrid state, the engine can be operated at high efficiency. The first input shaft is driven to work continuously in the rate range, and the speed of the transmission planetary carrier can be adjusted by adjusting the power input at the second input shaft, which can effectively improve the efficiency of the power system and reduce fuel consumption. In addition, under this transmission mode, since the planetary reduction unit is the main component for reducing speed and increasing torque, the planetary reduction unit has a large torque output, and the power input of the first output shaft can meet the transmission requirements through a relatively low torque input, so the radial force received by the first input shaft, the second input shaft and the third input shaft during transmission can be effectively reduced, and the working stability and reliability of the speed change device under heavy load conditions can be improved, which effectively solves the problem that the transmission of the existing hybrid system is difficult to effectively meet the use requirements of hybrid working vehicles.

[0007] In an optional embodiment, the transmission assembly also includes a first transmission shaft and a second transmission shaft, the first transmission shaft is rotatably mounted on the outside of the second input shaft, the first transmission shaft is transmission-matched with the first input shaft and is transmission-connected to the transmission ring gear, the second transmission shaft is transmission-connected to the transmission planetary carrier and is transmission-matched with the first output shaft.

[0008] Beneficial effects: The first transmission shaft can axially extend the transmission matching position of the transmission ring gear, and the second transmission shaft can axially extend the transmission matching position of the transmission planetary carrier. After assembly, the overall structure is compact and reliable, which facilitates the transmission matching between the planetary transmission part and the corresponding components, and occupies less space.

[0009] In an optional embodiment, a first power gear is provided on the first output shaft, a second power gear is provided on the second transmission shaft, a third power gear is provided on the third input shaft, and the first power gear is simultaneously cooperated with the second power gear and the third power gear.

[0010] Beneficial effect: The transmission requirement can be met by arranging a first power gear on the first output shaft, which can effectively reduce the number of transmission parts used and reduce the complexity of the device.

[0011] In an optional embodiment, the second input shaft, the first transmission shaft and the second transmission shaft are coaxially arranged, and the second input shaft and the third input shaft are located on two radially opposite sides of the first output shaft.

[0012] Beneficial effect: This input shaft arrangement can make the force on the first output shaft more balanced during transmission.

[0013] In an optional embodiment, a first mounting seat is provided on the outer circumferential surface of the first transmission shaft, the outer hub of the first clutch is connected to the first mounting seat, and the inner hub is connected to the transmission gear ring.

[0014] Beneficial effects: With this assembly method, the transmission gear ring only needs a simple connecting structure to be connected to the inner hub of the transmission gear ring, which can effectively simplify the structure of the transmission gear ring. In addition, the first mounting seat is connected to the outer hub of the first clutch, and a protective structure can also be formed on the outside of the first clutch to prevent external components from interfering with the first clutch.

[0015] In an optional embodiment, the first planetary gear assembly includes a first sun gear, a first planetary gear, a first planet carrier, and a first ring gear that are in transmission cooperation, and the second planetary gear assembly includes a second sun gear, a second planetary gear, a second planet carrier, and a second ring gear that are in transmission cooperation, the first planet carrier is transmission connected to the second ring gear, the first ring gear is transmission connected to the second sun gear, the first sun gear is the power input part and is connected to the first output shaft, and the second ring gear is the power output part.

[0016] Beneficial effects: The structures of the first planetary gear assembly and the second planetary gear assembly are simple and reliable, and a variety of transmission modes with different transmission ratios can be realized by matching the two planetary gear assemblies.

[0017] In an optional embodiment, the planetary reduction unit also includes a second output shaft and a transmission sleeve, the first planetary carrier is transmission connected to the second ring gear through the second output shaft, the transmission sleeve is sleeved on the outside of the second output shaft, and the first ring gear is transmission connected to the second sun gear through the transmission sleeve; wherein, when the planetary reduction unit is in the first transmission state, the transmission adjustment assembly alone fixes the second planetary carrier, when the planetary reduction unit is in the second transmission state, the transmission adjustment assembly alone fixes the first ring gear, and when the planetary reduction unit is in the third transmission state, the planetary reduction unit fixes the first planetary gear assembly as a whole for rotation.

[0018] Beneficial effects: The matching form of the second output shaft and the transmission sleeve is simple and reliable, the two are matched in the form of sleeve arrangement, the overall structure is compact and occupies less space.

[0019] In an optional embodiment, the transmission adjustment assembly includes a fixed frame, a third clutch, a fourth clutch and a fifth clutch, the second planetary carrier is detachably connected to the fixed frame through the third clutch, the first ring gear is detachably connected to the fixed frame through the fourth clutch, and the first ring gear is detachably connected to the first output shaft through the fifth clutch.

[0020] Beneficial effects: The transmission adjustment component has a simple and reliable structure.

[0021] In an optional implementation, the first clutch, the second clutch, the third clutch, the fourth clutch and the fifth clutch are all wet clutches.

[0022] Beneficial effect: Wet clutch is more reliable and durable.

[0023] In the second aspect, the present invention also provides a power system, which includes: the above-mentioned speed transmission device; an engine, connected to the first input shaft of the speed transmission device through a power clutch; a first power motor, connected to the second input shaft of the speed transmission device; and a second power motor, connected to the third input shaft of the speed transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A cross-sectional schematic diagram of a speed change device according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 An enlarged schematic diagram of the speed change device at point A shown;

[0027] Figure 3 for Figure 1 The transmission diagram shown is a diagram of the first output shaft of the speed change device after being assembled with the planetary reduction unit.

[0028] Description of reference numerals:

[0029] 1. First input shaft; 2. Second input shaft;

[0030] 3. third input shaft; 301. third power gear;

[0031] 4. First output shaft; 401. First power gear; 402. Second mounting seat;

[0032] 5. Transmission assembly; 501. first transmission shaft; 5011. first mounting seat; 502. second transmission shaft; 5021. second power gear;

[0033] 6. Planetary transmission unit; 601. Transmission sun gear; 602. Transmission planetary gear; 603. Transmission planet carrier; 604. Transmission ring gear;

[0034] 7. First clutch; 8. Second clutch;

[0035] 9. First planetary gear assembly; 901. First sun gear; 902. First planetary gear; 903. First planet carrier; 904. First ring gear;

[0036] 10. Second planetary gear assembly; 1001. Second sun gear; 1002. Second planetary gear; 1003. Second planet carrier; 1004. Second ring gear;

[0037] 11. Second output shaft; 12. Transmission sleeve; 13. Fixed frame; 14. Third clutch; 15. Fourth clutch; 16. Fifth clutch;

[0038] 17. Engine; 18. Power clutch; 19. First power motor; 20. Second power motor. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0041] According to an embodiment of the present invention, on the one hand, a speed change device is provided, including: a first input shaft 1, a second input shaft 2, a third input shaft 3, a first output shaft 4 and a planetary reduction unit, the first input shaft 1 is suitable for being connected to an engine 17 through a power clutch 18; the second input shaft 2 is suitable for being connected to a first power motor 19; the third input shaft 3 is suitable for being connected to a second power motor 20; the first output shaft 4 is simultaneously matched with the first input shaft 1 and the second input shaft 2 through a transmission assembly, and the first output shaft 4 is matched with the third input shaft 3; the transmission assembly includes a planetary transmission unit 6, a first clutch 7 and a second clutch 8, the planetary transmission unit 6 includes a transmission sun gear 601, a transmission planetary gear 602, a transmission planetary carrier 603, and a transmission ring gear 606 that are matched with each other in transmission. 04, the first input shaft 1 is detachably connected to the transmission ring gear 604 through the first clutch 7, the transmission sun gear 601 is matched with the second input shaft 2, the transmission planetary carrier 603 is matched with the first output shaft 4, and the second clutch 8 is used to fix the transmission ring gear 604 alone; the planetary reduction unit has a transmission adjustment component and a first planetary gear assembly 9 and a second planetary gear assembly 10 that are connected in transmission, the first planetary gear assembly 9 has a power input part, the second planetary gear assembly 10 has a power output part, the power input part is connected in transmission with the first output shaft 4, the transmission adjustment component is suitable for adjusting the transmission matching state of the first planetary gear assembly 9 and the second planetary gear assembly 10, and the planetary reduction unit has a first transmission state, a second transmission state and a third transmission state with gradually decreasing transmission ratios.

[0042] The transmission device of this embodiment is used, and the input power is combined with the planetary reduction unit in a planetary power splitting manner to realize power transmission. The planetary reduction unit can realize three-speed ratio by adjusting the transmission state, so that the transmission device can realize pure electric three-speed and hybrid three-speed transmission. Since there are many selectable gears, the hybrid working vehicle can flexibly select the required gear for power output according to demand, which can effectively improve the gear utilization efficiency of the transmission device;

[0043] Specifically, the power of the first input shaft 1 and the second input shaft 2 is coupled through the planetary transmission part 6 and then outputted through the transmission planet carrier 603. Since the rotation speed of the transmission planet carrier 603 is jointly determined by the rotation speeds of the first input shaft 1 and the second input shaft 2, when the vehicle is operating in a hybrid state, the engine 17 can drive the first input shaft 1 to continuously operate in a high efficiency range. The rotation speed of the transmission planet carrier 603 can be adjusted by adjusting the power input at the second input shaft 2, which can effectively improve the efficiency of the power system and reduce fuel consumption.

[0044] In addition, under this transmission mode, since the planetary reduction unit is the main component for reducing speed and increasing torque, the planetary reduction unit has a large torque output, and the power input of the first output shaft 4 can meet the transmission requirements through a relatively low torque input. Therefore, the radial force exerted on the first input shaft 1, the second input shaft 2 and the third input shaft 3 during transmission can be effectively reduced, and the working stability and reliability of the speed change device under heavy load conditions can be improved, which effectively solves the problem that the transmission of the existing hybrid system is difficult to effectively meet the use requirements of hybrid working vehicles.

[0045] Specifically, since the speed change device of this embodiment mainly uses a clutch to change the current transmission gear, compared with the sleeve shifting in the related art, the speed change device of this embodiment will not experience power interruption when shifting gears. At the same time, it is more wear-resistant and durable during long-term use.

[0046] In a possible embodiment, the transmission assembly 5 also includes a first transmission shaft 501 and a second transmission shaft 502. The first transmission shaft 501 is rotatably sleeved on the outside of the second input shaft 2. The first transmission shaft 501 is transmission-matched with the first input shaft 1 and is transmission-connected to the transmission ring gear 604. The second transmission shaft 502 is transmission-connected to the transmission planetary carrier 603 and is transmission-matched with the first output shaft 4. The first transmission shaft 501 can axially extend the transmission matching position of the transmission ring gear 604, and the second transmission shaft 502 can axially extend the transmission matching position of the transmission planetary carrier 603. After assembly, the overall structure is compact and reliable, which facilitates the transmission matching of the planetary transmission part 6 with the corresponding components, and occupies a small space.

[0047] It can be understood that, as a replaceable embodiment, the transmission assembly 5 may not be provided with the first transmission shaft 501 and the second transmission shaft 502, and one end face of the transmission ring gear 604 may be extended along the axial direction to form the required transmission matching sleeve, and a transmission gear is provided on the outside of the transmission matching sleeve to enable the transmission ring gear 604 to directly cooperate with the first transmission shaft 501; the transmission planetary carrier 603 may also be extended along the axial direction to form the required transmission matching shaft, and a transmission gear is provided on the outer peripheral surface of the transmission matching shaft to enable the transmission planetary carrier 603 to directly cooperate with the first output shaft 4.

[0048] In a possible implementation, a first power gear 401 is provided on the first output shaft 4, a second power gear 5021 is provided on the second transmission shaft 502, a third power gear 301 is provided on the third input shaft 3, and the first power gear 401 is simultaneously in transmission cooperation with the second power gear 5021 and the third power gear 301. By providing a first power gear 401 on the first output shaft 4, the transmission requirements can be met, the number of transmission components used can be effectively reduced, and the complexity of the device can be reduced.

[0049] It can be understood that, as a replaceable embodiment, two first power gears 401 can also be provided on the first input shaft 1, and the second power gear 5021 and the third power gear 301 are respectively matched with the corresponding first power gear 401 for transmission. The first power gear 401 in this arrangement can also change the transmission ratio by changing the transmission radius of the corresponding first power gear 401.

[0050] In a possible implementation, the second input shaft 2, the first transmission shaft 501 and the second transmission shaft 502 are coaxially arranged, and the second input shaft 2 and the third input shaft 3 are located on two radially opposite sides of the first output shaft 4. This input shaft arrangement can make the force on the first output shaft 4 more balanced during transmission.

[0051] It can be understood that, as an alternative embodiment, if necessary, the second input shaft 2, the first transmission shaft 501 and the second transmission shaft 502 can be coaxially arranged, or all three can be non-coaxially arranged.

[0052] In a possible embodiment, a first mounting seat 5011 is provided on the outer peripheral surface of the first transmission shaft 501, the outer hub of the first clutch 7 is connected to the first mounting seat 5011, and the inner hub is connected to the transmission ring gear 604. In this assembly method, the transmission ring gear 604 only requires a simple structural connection structure to be connected to the inner hub of the transmission ring gear 604, which can effectively simplify the structural form of the transmission ring gear 604. In addition, the first mounting seat 5011 is connected to the outer hub of the first clutch 7, and a protective structure can also be formed on the outside of the first clutch 7 to prevent external components from interfering with the first clutch 7.

[0053] It can be understood that, as a replaceable implementation, the outer hub of the first clutch 7 may be connected to the transmission ring gear 604 , and the inner hub may be connected to the first mounting seat 5011 .

[0054] Specifically, the first mounting seat 5011 is an annular component sleeved on the outer circumferential surface of the first transmission shaft 501. The first mounting seat 5011 is provided with an annular mounting groove on the side facing the transmission ring gear 604, and the first clutch 7 is arranged in the mounting groove. This form of the first mounting seat 5011 provides an installation space for the first clutch 7, and the first mounting seat 5011 can be installed during assembly.

[0055] In a possible embodiment, the first planetary gear assembly 9 includes a first sun gear 901, a first planetary gear 902, a first planetary carrier 903, and a first ring gear 904 that are in transmission cooperation, and the second planetary gear assembly 10 includes a second sun gear 1001, a second planetary gear 1002, a second planetary carrier 1003, and a second ring gear 1004 that are in transmission cooperation. The first planetary carrier 903 is transmission-connected to the second ring gear 1004, and the first ring gear 904 is transmission-connected to the second sun gear 1001. The first sun gear 901 is a power input part and is connected to the first output shaft 4, and the second ring gear 1004 is a power output part. The structural form of the first planetary gear assembly 9 and the second planetary gear assembly 10 is simple and reliable. By cooperating with the two planetary gear assemblies, a variety of transmission modes with different transmission ratios can be achieved.

[0056] In a possible implementation, the planetary reduction unit also includes a second output shaft 11 and a transmission sleeve 12, the first planetary carrier 903 is transmission-connected to the second ring gear 1004 via the second output shaft 11, the transmission sleeve 12 is sleeved on the outside of the second output shaft 11, and the first ring gear 904 is transmission-connected to the second sun gear 1001 via the transmission sleeve 12; wherein, when the planetary reduction unit is in the first transmission state, the transmission adjustment component alone fixes the second planetary carrier 1003, when the planetary reduction unit is in the second transmission state, the transmission adjustment component alone fixes the first ring gear 904, when the planetary reduction unit is in the third transmission state, the planetary reduction unit fixes the first planetary gear assembly 9 as a whole for rotation, the matching form of the second output shaft 11 and the transmission sleeve 12 is simple and reliable, the two are matched in the form of sleeve, the overall structure is compact and occupies less space.

[0057] Specifically, there is no limitation on the fixing form of the planetary reduction unit that fixes the first planetary gear assembly 9 as a whole for rotation. It can be that the first output shaft 4 is fixedly connected to the first ring gear 904, the first output shaft 4 is fixedly connected to the first planetary carrier 903, the first sun gear 901 is fixedly connected to the first planetary carrier 903, or the first sun gear 901 is fixedly connected to the first ring gear 904, as long as the first sun gear 901, the first planetary gear 902 and the first planetary carrier 903 can rotate as a whole.

[0058] In a possible embodiment, the transmission adjustment component includes a fixed frame 13, a third clutch 14, a fourth clutch 15 and a fifth clutch 16, the second planetary carrier 1003 is detachably connected to the fixed frame 13 through the third clutch 14, the first ring gear 904 is detachably connected to the fixed frame 13 through the fourth clutch 15, and the first ring gear 904 is detachably connected to the first output shaft 4 through the fifth clutch 16, and the transmission adjustment component has a simple and reliable structure.

[0059] The third clutch 14 and the fourth clutch 15 are brakes that play a braking role.

[0060] Specifically, when in the first transmission state, the first output shaft 4 transmits power to the first sun gear 901. At this time, the third clutch 14 locks the second planetary carrier 1003. A part of the power of the first sun gear 901 is output through the first planetary carrier 903 driven by the first planetary gear 902. The first planetary carrier 903 is connected to the second output shaft 11 through a spline. Another part of the power of the first sun gear 901 is output through the first ring gear 904 driven by the first planetary gear 902. The first ring gear 904 drives the second sun gear 1001 to rotate through the transmission sleeve 12. The rotation of the second sun gear 1001 drives the second planetary gear 1002 to rotate and then drives the second ring gear 1004 to rotate. The power of the second ring gear 1004 is coupled with the power on the second output shaft 11 and then output.

[0061] When in the second transmission state, the first output shaft 4 transmits power to the first sun gear 901. At this time, the fourth clutch 15 locks the first ring gear 904. The power of the first sun gear 901 is all output through the first planetary carrier 903 driven by the first planetary gear 902. The first planetary carrier 903 is connected to the second output shaft 11 through a spline.

[0062] When in the third transmission state, the first output shaft 4 transmits power to the first sun gear 901. At this time, the fifth clutch 16 fixedly connects the first ring gear 904 to the first output shaft 4. At this time, the first planetary gear assembly 9 rotates as a whole. The power of the first sun gear 901 is directly output through the first planetary carrier 903, and the first planetary carrier 903 is connected to the second output shaft 11 through a spline.

[0063] The fixing frame 13 may be a separate frame body, or may be the outer shell of the transmission device itself.

[0064] In addition, a second mounting seat 402 is provided on the outer circumferential surface of the first output shaft 4 , the outer hub of the fifth clutch 16 is connected to the second mounting seat 402 , and the inner hub of the fifth clutch 16 is connected to the first ring gear 904 .

[0065] It can be understood that, as an alternative embodiment, the inner hub of the fifth clutch 16 can also be connected to the second mounting seat 402, while the outer hub is connected to the first ring gear 904, which can be flexibly selected according to needs.

[0066] Specifically, Figure 1 As shown, the second mounting seat 402 is a separate component, which is connected to the outer circumferential surface of the first output shaft 4 through an assembly step.

[0067] In a possible implementation, the first clutch 7, the second clutch 8, the third clutch 14, the fourth clutch 15 and the fifth clutch 16 are all wet clutches, which are more reliable and durable.

[0068] The gear positions of the transmission device of this embodiment are described in detail below:

[0069] Pure electric mode: Figure 1 As shown, when the power clutch 18 is disengaged, the engine 17 is not involved in the work. At this time, the second clutch 8 fixes the transmission ring gear 604 alone, and the power of the first power motor 19 is transmitted to the transmission sun gear 601 through the second input shaft 2. The transmission sun gear 601 drives the transmission planetary carrier 603 to rotate, and is transmitted to the first output shaft 4 through the transmission planetary carrier 603. The second power motor 20 transmits power to the first output shaft 4 through the third input shaft 3; wherein, it can be a single motor or two motors can work at the same time.

[0070] Hybrid mode: Figure 1 As shown, when the power clutch 18 is engaged, the engine 17 is in the working state. At this time, the second clutch 8 is in the disengaged state. The engine 17 drives the transmission ring gear 604 to rotate through the first input shaft 1. The power of the first power motor 19 is transmitted to the transmission sun gear 601 through the second input shaft 2. The transmission sun gear 601 and the transmission ring gear 604 simultaneously drive the transmission planetary carrier 603 to rotate. The transmission planetary carrier 603 outputs the hybrid power of the engine 17 and the first power motor 19. The hybrid power is transmitted to the first output shaft 4 through the transmission planetary carrier 603. The second power motor 20 transmits the power to the first output shaft 4 through the third input shaft 3.

[0071] When the first clutch 7, the second clutch 8, the third clutch 14, the fourth clutch 15 and the fifth clutch 16 are all in the disengaged state, it is the N gear.

[0072] like Figure 1As shown, when only the power clutch 18 and the third clutch 14 are in the engaged state, the engine 17 drives the first transmission shaft 501 to rotate through the first input shaft 1, and the first transmission shaft 501 drives the transmission ring gear 604 to rotate, and the power of the first power motor 19 is transmitted to the transmission sun gear 601 through the second input shaft 2, and the transmission sun gear 601 and the transmission ring gear 604 simultaneously drive the transmission planetary carrier 603 to rotate, and the transmission planetary carrier 603 outputs the hybrid power of the engine 17 and the first power motor 19 and drives the second transmission shaft 502 to rotate, and the hybrid power is transmitted to the second transmission shaft 502, and the power of the second power motor 20 is transmitted to the third input shaft 3, and the second transmission shaft 502 and the third input shaft 3 simultaneously drive the first output shaft 4 to rotate. The first output shaft 4 transmits power to the first sun gear 901. At this time, the third clutch 14 locks the second planetary carrier 1003. A part of the power of the first sun gear 901 is output through the first planetary carrier 903 driven by the first planetary gear 902. The first planetary carrier 903 is connected to the second output shaft 11 through a spline. Another part of the power of the first sun gear 901 is output through the first ring gear 904 driven by the first planetary gear 902. The first ring gear 904 drives the second sun gear 1001 to rotate through the transmission sleeve 12. The rotation of the second sun gear 1001 drives the second planetary gear 1002 to rotate and then drives the second ring gear 1004 to rotate. The power of the second ring gear 1004 is coupled with the power on the second output shaft 11 and then output. The above is the transmission process of the first gear.

[0073] The specific gear position is mainly controlled by the working state of each clutch and other shifting elements. The working state of the shifting elements of other gear positions is shown in Table 1 below:

[0074]

[0075] Table 1 Coupling modes of shifting elements

[0076] Among them, it should be noted that the circle in the above table indicates that the clutch is in the engaged state, and the no circle indicates that the clutch is in the disengaged state; in the pure electric or hybrid state, the transmission ratios of the first to sixth gears decrease successively; the pure electric and hybrid states shown in the above table are both the case where the first power motor 19 and the second power motor 20 output power at the same time, or only one of the motors can output power.

[0077] According to an embodiment of the present invention, on the other hand, a power system is provided, which includes: the above-mentioned speed transmission device, an engine 17, a first power motor 19, and a second power motor 20, the engine 17 is connected to the first input shaft 1 of the speed transmission device through a power clutch 18; the first power motor 19 is connected to the second input shaft 2 of the speed transmission device; the second power motor 20 is connected to the third input shaft 3 of the speed transmission device.

[0078] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A speed change device, characterized in that: include: A first input shaft (1) adapted to be connected to an engine (17) via a power clutch (18); A second input shaft (2) adapted to be connected to a first power motor (19); A third input shaft (3), adapted to be connected to a second power motor (20); A first output shaft (4) is simultaneously in transmission cooperation with the first input shaft (1) and the second input shaft (2) through a transmission assembly, and the first output shaft (4) is in transmission cooperation with the third input shaft (3); The transmission assembly comprises a planetary transmission part (6), a first clutch (7) and a second clutch (8); the planetary transmission part (6) comprises a transmission sun gear (601), a transmission planetary gear (602), a transmission planetary carrier (603) and a transmission ring gear (604) in transmission cooperation; the first input shaft (1) is detachably connected to the transmission ring gear (604) through the first clutch (7); the transmission sun gear (601) is in transmission cooperation with the second input shaft (2); the transmission planetary carrier (603) is in transmission cooperation with the first output shaft (4); and the second clutch (8) is used to fix the transmission ring gear (604) alone; A planetary reduction unit comprises a transmission adjustment component and a first planetary gear assembly (9) and a second planetary gear assembly (10) in transmission connection, wherein the first planetary gear assembly (9) has a power input part, and the second planetary gear assembly (10) has a power output part, wherein the power input part is in transmission connection with the first output shaft (4), and the transmission adjustment component is suitable for adjusting the transmission matching state of the first planetary gear assembly (9) and the second planetary gear assembly (10), and the planetary reduction unit has a first transmission state, a second transmission state and a third transmission state in which the transmission ratio gradually decreases.

2. The speed change device according to claim 1, characterized in that: The transmission assembly further comprises a first transmission shaft (501) and a second transmission shaft (502); the first transmission shaft (501) is rotatably sleeved on the outside of the second input shaft (2); the first transmission shaft (501) is transmission-matched with the first input shaft (1) and is transmission-connected with the transmission ring gear (604); the second transmission shaft (502) is transmission-connected with the transmission planetary carrier (603) and is transmission-matched with the first output shaft (4).

3. The speed change device according to claim 2, characterized in that: The first output shaft (4) is provided with a first power gear (401), the second transmission shaft (502) is provided with a second power gear (5021), the third input shaft (3) is provided with a third power gear (301), and the first power gear (401) is simultaneously in transmission cooperation with the second power gear (5021) and the third power gear (301).

4. The speed change device according to claim 2, characterized in that: The second input shaft (2), the first transmission shaft (501) and the second transmission shaft (502) are coaxially arranged, and the second input shaft (2) and the third input shaft (3) are located on two radially opposite sides of the first output shaft (4).

5. The speed change device according to claim 2, characterized in that: A first mounting seat (5011) is provided on the outer peripheral surface of the first transmission shaft (501), the outer hub of the first clutch (7) is connected to the first mounting seat (5011), and the inner hub is connected to the transmission gear ring (604).

6. The speed change device according to any one of claims 1 to 5, characterized in that: The first planetary gear assembly (9) comprises a first sun gear (901), a first planetary gear (902), a first planet carrier (903), and a first ring gear (904) which are in transmission cooperation; the second planetary gear assembly (10) comprises a second sun gear (1001), a second planetary gear (1002), a second planet carrier (1003), and a second ring gear (1004) which are in transmission cooperation; the first planet carrier (903) is in transmission connection with the second ring gear (1004); the first ring gear (904) is in transmission connection with the second sun gear (1001); the first sun gear (901) is the power input part and is connected to the first output shaft (4); the second ring gear (1004) is the power output part.

7. The speed change device according to claim 6, characterized in that: The planetary reduction unit further comprises a second output shaft (11) and a transmission sleeve (12); the first planet carrier (903) is transmission-connected to the second ring gear (1004) via the second output shaft (11); the transmission sleeve (12) is sleeved on the outside of the second output shaft (11); the first ring gear (904) is transmission-connected to the second sun gear (1001) via the transmission sleeve (12); Wherein, when the planetary reduction unit is in the first transmission state, the transmission adjustment component alone fixes the second planetary carrier (1003); when the planetary reduction unit is in the second transmission state, the transmission adjustment component alone fixes the first ring gear (904); when the planetary reduction unit is in the third transmission state, the planetary reduction unit fixes the first planetary gear assembly (9) as a whole for rotation.

8. The speed change device according to claim 7, characterized in that: The transmission adjustment assembly comprises a fixed frame (13), a third clutch (14), a fourth clutch (15) and a fifth clutch (16); the second planetary carrier (1003) is detachably connected to the fixed frame (13) via the third clutch (14); the first ring gear (904) is detachably connected to the fixed frame (13) via the fourth clutch (15); and the first ring gear (904) is detachably connected to the first output shaft (4) via the fifth clutch (16).

9. The speed change device according to claim 8, characterized in that: The first clutch (7), the second clutch (8), the third clutch (14), the fourth clutch (15) and the fifth clutch (16) are all wet clutches.

10. A power system, characterized in that: include: The speed change device according to any one of claims 1 to 9; An engine (17) is connected to the first input shaft (1) of the transmission device via a power clutch (18); A first power motor (19) connected to the second input shaft (2) of the speed change device; The second power motor (20) is connected to the third input shaft (3) of the speed change device.

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