Gearbox power assembly and engineering machinery

Abstract

The utility model belongs to the technical field of engineering machinery, and particularly relates to a gearbox power assembly and engineering machinery. The gearbox power assembly comprises a first motor, a second motor, a gearbox, a first gear pair, a second gear pair and a clutch, the first motor is used for driving the working accessory, and the second motor is used for driving the gearbox; the gearbox comprises a plurality of planet rows and a gear switching mechanism; the first gear pair comprises a first gear and a second gear, the first gear is connected with a power output piece of the gearbox, and the second gear is fixed to an output shaft of the rear drive axle. The second gear pair comprises a third gear and a fourth gear, the third gear and the second gear are coaxially arranged, and the fourth gear is fixed to the front drive axle output shaft; the clutch is used for connecting or disconnecting the second gear and the third gear. The switching of four-wheel drive and two-wheel drive of the whole vehicle can be realized by controlling the engagement and disengagement of the clutch, and the switching efficiency is high; and the gearbox is a planetary gearbox, so that the structure is novel, and the design is reasonable.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a gearbox power assembly and engineering machinery. Background Art

[0002] In recent years, electric tractors have developed rapidly in the agricultural field. Its powertrain consists of batteries, motors and a small-gear transmission, which has unparalleled advantages such as energy saving, environmental protection, strong power and easy operation, replacing the traditional powertrain consisting of an engine and a multi-gear transmission. The drive motor can easily adjust the speed within the range of 0 to 4000rpm, which is much wider than the engine's range of 800 to 2200rpm, which reduces the number of gears of the matching transmission from more than 10 gears to 2 to 3 gears.

[0003] When a tractor is working in the field, it generally needs four-wheel drive to give the vehicle a stronger driving force; when driving in a field, it needs to switch from four-wheel drive to two-wheel drive to improve driving efficiency. Therefore, a decoupling mechanism needs to be set on the gearbox so that the vehicle has the function of switching between four-wheel drive and two-wheel drive. Most of the current decoupling mechanisms are mechanical and cannot achieve automatic switching. They must be stopped before switching, which seriously affects the operating efficiency of the vehicle. In particular, when the vehicle is in two-wheel drive mode and braking, the vehicle cannot automatically switch to four-wheel drive, affecting the braking performance of the vehicle. Utility Model Content

[0004] The purpose of the utility model is to provide a gearbox power assembly and engineering machinery, which can realize the switching between four-wheel drive and two-wheel drive of the whole vehicle by controlling the engagement and disconnection of the clutch, without stopping, and the switching efficiency is high; and the gearbox adopts a planetary gearbox with novel structure and reasonable design.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Transmission powertrain, including:

[0007] A first motor, an output end of which is connected to a first drive shaft, wherein the first drive shaft is connected to a working attachment;

[0008] A second motor, an output end of which is connected to a second drive shaft;

[0009] A gearbox, comprising a plurality of planetary rows and a gear switching mechanism, wherein the plurality of planetary rows are arranged in series along the axial direction of the second drive shaft, the sun gears in the plurality of planetary rows are fixedly sleeved on the second drive shaft, and the planet carriers or gear rings in the plurality of planetary rows close to the end of the second drive shaft are power output members; the gear switching mechanism is used to switch the power transmission path from the second drive shaft to the power output member;

[0010] A first gear pair, comprising a first gear and a second gear meshing with each other, wherein the first gear is connected to the power output member, the first gear is rotatably sleeved on the first drive shaft or the second drive shaft, and the second gear is fixedly sleeved on the output shaft of the rear drive axle;

[0011] A second gear pair includes a third gear and a fourth gear meshing with each other, wherein the third gear is coaxially arranged with the second gear, and the fourth gear is fixedly sleeved on the front drive axle output shaft;

[0012] The clutch is used to connect or disconnect the second gear and the third gear.

[0013] As a preferred technical solution of the transmission powertrain, the number of the planetary rows is two, including a first planetary row and a second planetary row, and the first planetary row is located on a side of the second planetary row away from the second motor.

[0014] As an optimal technical solution for the gearbox powertrain, the first planetary row includes a first sun gear, a first planetary gear, a first planetary carrier and a first ring gear, and the second planetary row includes a second sun gear, a second planetary gear, a second planetary carrier and a second ring gear; the series connection of the first planetary row and the second planetary row is that the first ring gear is fixedly connected to the second planetary carrier, and the first planetary carrier is a power output component.

[0015] As a preferred technical solution of the gearbox powertrain, the gear switching mechanism includes a gear gear and a sliding sleeve, the gear gear includes a zero gear gear, a first gear gear, a second gear gear and a third gear gear, the zero gear gear is fixedly arranged on the gearbox housing, the first gear gear is fixedly connected to the second planetary carrier, the second gear gear is fixedly connected to the second ring gear, and the third gear gear is fixedly sleeved on the second drive shaft; the sliding sleeve can control the engagement and disconnection of the zero gear gear and the first gear gear, the engagement and disconnection of the zero gear gear and the second gear gear, and the engagement and disconnection of the first gear gear and the third gear gear.

[0016] As an optimal technical solution for the gearbox powertrain, the first planetary row includes a first sun gear, a first planetary gear, a first planetary carrier and a first ring gear, and the second planetary row includes a second sun gear, a second planetary gear, a second planetary carrier and a second ring gear; the series connection of the first planetary row and the second planetary row is that the first planetary carrier is fixedly connected to the second ring gear, and the first ring gear is a power output component.

[0017] As a preferred technical solution of the gearbox powertrain, the gear switching mechanism includes a gear gear and a sliding sleeve, the gear gear includes a zero gear gear, a first gear gear, a second gear gear and a third gear gear, the zero gear gear is fixedly arranged on the gearbox housing, the first gear gear is fixedly connected to the second ring gear, the second gear gear is fixedly connected to the second planetary carrier, and the third gear gear is fixed to the second drive shaft; the sliding sleeve can control the engagement and disconnection of the zero gear gear and the first gear gear, the engagement and disconnection of the zero gear gear and the second gear gear, and the engagement and disconnection of the first gear gear and the third gear gear.

[0018] As a preferred technical solution of the gearbox powertrain, the zero gear is a double-row gear, including two sub-zero gears, one of which is located on the same side as the second gear, and the other is located on the same side as the first gear and the third gear;

[0019] The sliding sleeve includes a first sliding sleeve and a second sliding sleeve, the first sliding sleeve can control the connection and disconnection of one of the sub-zero gears with the second gear, and the second sliding sleeve can control the connection and disconnection of another sub-zero gear with the first gear, and the connection and disconnection of the first gear with the third gear.

[0020] As a preferred technical solution for the transmission power assembly, the first motor and the second motor are located on the same side of the transmission power assembly, the second drive shaft has a center hole, and the first drive shaft can pass through the center hole.

[0021] As a preferred technical solution for the transmission powertrain, the clutch is a wet clutch.

[0022] An engineering machine comprises a rear drive axle, a front drive axle and a gearbox power assembly as described in any of the above schemes, wherein the rear drive axle output shaft is connected to the rear drive axle, and the front drive axle output shaft is connected to the front drive axle.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides a gearbox power assembly, which can realize the switching between four-wheel drive and two-wheel drive of the whole vehicle by controlling the engagement and disengagement of the clutch, without stopping the vehicle, and has high switching efficiency; and the gearbox adopts a planetary gearbox with novel structure and reasonable design. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the principle of the gearbox power assembly provided by the utility model. Figure 1 ;

[0026] Figure 2This is a schematic diagram of the principle of the gearbox power assembly provided by the utility model. Figure 2 .

[0027] In the figure:

[0028] 10. A first motor; 11. A first drive shaft;

[0029] 20. Second motor; 21. Second drive shaft;

[0030] 31. First planetary row; 311. First sun gear; 312. First planetary gear; 313. First planetary carrier; 314. First ring gear; 32. Second planetary row; 321. Second sun gear; 322. Second planetary gear; 323. Second planetary carrier; 324. Second ring gear; 33. Shift gear; 331. Zero gear; 332. First gear; 333. Second gear; 334. Third gear; 34. Sliding sleeve; 341. First sliding sleeve; 342. Second sliding sleeve;

[0031] 40. First gear pair; 41. First gear; 42. Second gear;

[0032] 50, second gear pair; 51, third gear; 52, fourth gear;

[0033] 60. Working accessories; 70. Rear drive axle output shaft; 80. Front drive axle output shaft; 90. Clutch. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] like Figure 1 and Figure 2 As shown, the embodiment of the utility model provides a gearbox power assembly, including a first motor 10, a second motor 20, a gearbox, a first gear pair 40, a second gear pair 50 and a clutch 90. The output end of the first motor 10 is connected to a first drive shaft 11, and the first drive shaft 11 is connected to a working attachment 60; the output end of the second motor 20 is connected to a second drive shaft 21. The gearbox includes a plurality of planetary rows and a gear switching mechanism, the plurality of planetary rows are arranged in series along the axial direction of the second drive shaft 21, the sun gears in the plurality of planetary rows are fixedly sleeved on the second drive shaft 21, and the planet carriers or gear rings in the plurality of planetary rows near the end of the second drive shaft 21 are power output members; the gear switching mechanism is used to switch the power transmission path from the second drive shaft 21 to the power output member. The first gear pair 40 includes a first gear 41 and a second gear 42 that are meshed with each other, the first gear 41 is connected to the power output member of the gearbox, the first gear 41 is rotatably sleeved on the first drive shaft 11 or the second drive shaft 21, and the second gear 42 is fixedly sleeved on the rear drive axle output shaft 70. The second gear pair 50 includes a meshing third gear 51 and a fourth gear 52, the third gear 51 is coaxially arranged with the second gear 42, and the fourth gear 52 is fixedly sleeved on the front drive axle output shaft 80. The clutch 90 is used to connect or disconnect the second gear 42 and the third gear 51.

[0039] When the clutch 90 disconnects the second gear 42 and the third gear 51, the power of the second motor 20 is first transmitted to the first gear 41 through the gearbox, and then transmitted from the first gear 41 to the second gear 42, and then transmitted from the second gear 42 to the rear drive axle output shaft 70. Because the clutch 90 disconnects the second gear 42 and the third gear 51, the power of the second gear 42 cannot be transmitted to the third gear 51. At this time, only the rear drive axle output shaft 70 outputs power, and the whole vehicle is in a two-wheel drive state, which is suitable for high-speed driving conditions. When the clutch 90 combines the second gear 42 and the third gear 51, the power of the second motor 20 is first transmitted to the first gear 41 through the gearbox, and then transmitted from the first gear 41 to the second gear 42, and then transmitted from the second gear 42 to the rear drive axle output shaft 70. Because the clutch 90 connects the second gear 42 and the third gear 51, the power of the second gear 42 can also be transmitted to the third gear 51, and then transmitted from the third gear 51 to the fourth gear 52, and then transmitted from the fourth gear 52 to the front drive axle output shaft 80. At this time, the front drive axle output shaft 80 and the rear drive axle output shaft 70 output power at the same time, and the whole vehicle is in a four-wheel drive state, which is suitable for working conditions.

[0040] The braking signal of the vehicle communicates with the control signal of the clutch 90 in real time. When the vehicle brakes, the control valve of the clutch 90 is connected, the clutch 90 combines the second gear 42 and the third gear 51, and the vehicle switches to the four-wheel drive state; when the vehicle releases the brake, the control valve of the clutch 90 is disconnected, the clutch 90 disconnects the second gear 42 and the third gear 51, and the vehicle switches to the two-wheel drive state. Optionally, the clutch 90 is a wet clutch 90.

[0041] Optionally, there are two planetary rows, including a first planetary row 31 and a second planetary row 32, the first planetary row 31 including a first sun gear 311, a first planetary gear 312, a first planetary carrier 313 and a first ring gear 314, and the second planetary row 32 including a second sun gear 321, a second planetary gear 322, a second planetary carrier 323 and a second ring gear 324.

[0042] The gear switching mechanism includes a gear gear 33 and a sliding sleeve 34 . The gear gear 33 includes a zero gear 331 , a first gear gear 332 , a second gear gear 333 and a third gear gear 334 .

[0043] There are two ways to connect the first planetary gear 31 and the second planetary gear 32 in series. Figure 1The first series connection mode is that the first gear ring 314 is fixedly connected to the second planetary carrier 323, and the first planetary carrier 313 is connected to the first gear 41 as a power output member. In this series connection mode, the zero gear 331 is fixedly arranged on the gearbox housing, the first gear 332 is fixedly connected to the second planetary carrier 323, the second gear 333 is fixedly connected to the second gear ring 324, and the third gear 334 is fixed on the second drive shaft 21. Figure 2 The second series connection mode is that the first planetary carrier 313 is fixedly connected to the second gear ring 324, and the first gear ring 314 is used as a power output member to be connected to the first gear 41. In this series connection mode, the zero gear 331 is fixedly arranged on the gearbox housing, the first gear 332 is fixedly connected to the second gear ring 324, the second gear 333 is fixedly connected to the second planetary carrier 323, and the third gear 334 is fixed on the second drive shaft 21.

[0044] The difference between the two series connection modes of the first planetary gear 31 and the second planetary gear 32 is that the output transmission ratios are different. The output transmission ratio of the first series connection mode is greater than the output transmission ratio of the second series connection mode. The specific selection can be made according to needs.

[0045] The sliding sleeve 34 can control the connection and disconnection between the zero gear 331 and the first gear 332, the connection and disconnection between the zero gear 331 and the second gear 333, and the connection and disconnection between the first gear 332 and the third gear 334. In this embodiment, the zero gear 331 is a double-row gear, including two sub-zero gears, one of which is located on the same side as the second gear 333, and the other sub-zero gear is located on the same side as the first gear 332 and the third gear 334. The sliding sleeve 34 includes a first sliding sleeve 341 and a second sliding sleeve 342, the first sliding sleeve 341 can control the connection and disconnection between one of the sub-zero gears and the second gear 333, the second sliding sleeve 342 can control the connection and disconnection between the other sub-zero gear and the first gear 332, and the connection and disconnection between the first gear 332 and the third gear 334.

[0046] When the gearbox needs to be switched to the first gear, the second sliding sleeve 342 is controlled to combine the zero gear 331 and the first gear 332. Figure 1 When the first planetary gear 31 and the second planetary gear 32 are connected in series in the first gear, the power transmission route of the gearbox in the first gear state is: the power of the motor is transmitted to the first gear 41 via the first sun gear 311, the first planetary gear 312 and the first planetary carrier 313. Figure 2When the first planetary gear 31 and the second planetary gear 32 adopt the second series connection mode, the power transmission route of the gearbox in the first gear state is: the power of the motor is transmitted to the first gear 41 via the first sun gear 311, the first planetary gear 312 and the first ring gear 314. The power is then transmitted to the rear drive axle output shaft 70 via the first gear pair 40. When the clutch 90 is connected, the power is simultaneously transmitted to the front drive axle output shaft 80 via the second gear pair 50. At this time, the whole vehicle is in a four-wheel drive state; when the clutch 90 is disconnected, the power will not be transmitted to the front drive axle output shaft 80 via the second gear pair 50. At this time, the whole vehicle is in a two-wheel drive state.

[0047] When the gearbox needs to switch to the second gear, the second sliding sleeve 342 is controlled to disconnect the zero gear 331 from the first gear 332, and the second sliding sleeve 342 is returned to the empty position of the first gear 332, and then the speed of the second motor 20 is adjusted to make the speed of the second gear 333 the same as the speed of the zero gear 331, and then the first sliding sleeve 341 is controlled to connect the second gear 333 with the zero gear 331. Figure 1 When the first planetary gear 31 and the second planetary gear 32 adopt the first series connection mode, the power transmission route of the main gearbox in the second gear state is: the power of the motor is transmitted to the first planetary gear 313 via the second sun gear 321, the second planetary gear 322, the second planetary gear 323, the first ring gear 314 and the first planetary gear 312, and is transmitted to the first planetary gear 313 via the first sun gear 311 and the first planetary gear 312. The two powers are transmitted to the first gear 41 after merging at the first planetary gear 313. Figure 2 When the first planetary gear 31 and the second planetary gear 32 adopt the second series connection mode, the power transmission route of the gearbox in the second gear state is: the power of the motor is transmitted to the first ring gear 314 via the second sun gear 321, the second planetary gear 322, the second ring gear 324, the first planetary carrier 313, and the first planetary gear 312 on the one hand, and is transmitted to the first ring gear 314 via the first sun gear 311, the first planetary gear 312 on the other hand. The two powers are combined at the first ring gear 314 and then transmitted to the first gear 41. The power is then transmitted to the rear drive axle output shaft 70 through the first gear pair 40. When the clutch 90 is connected, the power is simultaneously transmitted to the front drive axle output shaft 80 through the second gear pair 50. At this time, the whole vehicle is in a four-wheel drive state; when the clutch 90 is disconnected, the power will not be transmitted to the front drive axle output shaft 80 through the second gear pair 50. At this time, the whole vehicle is in a two-wheel drive state.

[0048] When the gearbox needs to switch to the third gear, the first sliding sleeve 341 is controlled to disconnect the zero gear 331 from the second gear 333, and the first sliding sleeve 341 is returned to the empty position of the second gear 333, and then the speed of the second motor 20 is adjusted to make the speed of the third gear 334 the same as the speed of the first gear 332, and then the second sliding sleeve 342 is controlled to connect the third gear 334 with the first gear 332. Figure 1 When the first planetary gear 31 and the second planetary gear 32 are connected in series in the first manner, the power transmission route of the gearbox in the third gear state is: the power of the motor is directly transmitted to the first gear 41. Figure 2 When the first planetary gear 31 and the second planetary gear 32 adopt the second series connection mode, the power transmission route of the gearbox in the third gear state is also: the power of the motor is directly transmitted to the first gear 41. The power is then transmitted to the rear drive axle output shaft 70 through the first gear pair 40. When the clutch 90 is connected, the power is simultaneously transmitted to the front drive axle output shaft 80 through the second gear pair 50. At this time, the whole vehicle is in a four-wheel drive state; when the clutch 90 is disconnected, the power will not be transmitted to the front drive axle output shaft 80 through the second gear pair 50. At this time, the whole vehicle is in a two-wheel drive state.

[0049] The utility model also provides an engineering machine, comprising a rear drive axle, a front drive axle and the above-mentioned gearbox power assembly, wherein the rear drive axle output shaft 70 is connected to the rear drive axle, and the front drive axle output shaft 80 is connected to the front drive axle. In this embodiment, the engineering machine is an electric tractor, but is not limited thereto.

[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A gearbox powertrain, characterized in that: include: A first motor (10), an output end of which is connected to a first drive shaft (11), wherein the first drive shaft (11) is connected to a working tool (60); A second motor (20), an output end of which is connected to a second drive shaft (21); A gearbox, comprising a plurality of planetary gears and a gear switching mechanism, wherein the plurality of planetary gears are arranged in series along the axial direction of the second drive shaft (21), the sun gears in the plurality of planetary gears are fixedly sleeved on the second drive shaft (21), and the planet carriers or gear rings in the plurality of planetary gears close to the ends of the second drive shaft (21) are power output components; and the gear switching mechanism is used to switch the power transmission path from the second drive shaft (21) to the power output component; A first gear pair (40) comprises a first gear (41) and a second gear (42) meshing with each other, wherein the first gear (41) is connected to the power output member, the first gear (41) is rotatably sleeved on the first drive shaft (11) or the second drive shaft (21), and the second gear (42) is fixedly sleeved on the rear drive axle output shaft (70); A second gear pair (50) comprises a third gear (51) and a fourth gear (52) meshing with each other, wherein the third gear (51) is coaxially arranged with the second gear (42), and the fourth gear (52) is fixedly sleeved on the front drive axle output shaft (80); The clutch (90) is used to connect or disconnect the second gear (42) and the third gear (51).

2. The gearbox power assembly according to claim 1, characterized in that: The number of the planetary rows is two, including a first planetary row (31) and a second planetary row (32); the first planetary row (31) is located on a side of the second planetary row (32) away from the second motor (20).

3. The gearbox power assembly according to claim 2, characterized in that: The first planetary row (31) comprises a first sun gear (311), a first planetary gear (312), a first planetary carrier (313) and a first ring gear (314); the second planetary row (32) comprises a second sun gear (321), a second planetary gear (322), a second planetary carrier (323) and a second ring gear (324); the first planetary row (31) and the second planetary row (32) are connected in series in such a way that the first ring gear (314) is fixedly connected to the second planetary carrier (323), and the first planetary carrier (313) is a power output component.

4. The gearbox power assembly according to claim 3, characterized in that: The gear switching mechanism comprises a gear gear (33) and a sliding sleeve (34); the gear gear (33) comprises a zero gear (331), a first gear gear (332), a second gear gear (333) and a third gear gear (334); the zero gear gear (331) is fixedly arranged on a gearbox housing; the first gear gear (332) is fixedly connected to the second planetary carrier (323); the second gear gear (333) is fixedly connected to the second gear ring (324); and the third gear gear (334) is fixedly sleeved on the second drive shaft (21); and the sliding sleeve (34) is capable of controlling the engagement and disconnection of the zero gear gear (331) and the first gear gear (332), the engagement and disconnection of the zero gear gear (331) and the second gear gear (333), and the engagement and disconnection of the first gear gear (332) and the third gear gear (334).

5. The gearbox power assembly according to claim 2, characterized in that: The first planetary row (31) comprises a first sun gear (311), a first planetary gear (312), a first planetary carrier (313) and a first ring gear (314); the second planetary row (32) comprises a second sun gear (321), a second planetary gear (322), a second planetary carrier (323) and a second ring gear (324); the first planetary row (31) and the second planetary row (32) are connected in series in such a way that the first planetary carrier (313) and the second ring gear (324) are fixedly connected, and the first ring gear (314) is a power output component.

6. The gearbox power assembly according to claim 5, characterized in that: The gear switching mechanism comprises a gear gear (33) and a sliding sleeve (34); the gear gear (33) comprises a zero gear (331), a first gear gear (332), a second gear gear (333) and a third gear gear (334); the zero gear gear (331) is fixedly arranged on a gearbox housing; the first gear gear (332) is fixedly connected to the second gear ring (324); the second gear gear (333) is fixedly connected to the second planetary carrier (323); and the third gear gear (334) is fixed to the second drive shaft (21); and the sliding sleeve (34) is capable of controlling the connection and disconnection of the zero gear gear (331) and the first gear gear (332), the connection and disconnection of the zero gear gear (331) and the second gear gear (333), and the connection and disconnection of the first gear gear (332) and the third gear gear (334).

7. The gearbox power assembly according to claim 4 or 6, characterized in that: The zero gear (331) is a double-row gear, comprising two sub-zero gears, wherein one of the sub-zero gears is located on the same side as the second gear gear (333), and the other sub-zero gear is located on the same side as the first gear gear (332) and the third gear gear (334); The sliding sleeve (34) comprises a first sliding sleeve (341) and a second sliding sleeve (342), wherein the first sliding sleeve (341) is capable of controlling the engagement and disconnection of one of the sub-zero gears with the second gear (333), and the second sliding sleeve (342) is capable of controlling the engagement and disconnection of another sub-zero gear with the first gear (332), and the engagement and disconnection of the first gear (332) with the third gear (334).

8. The transmission power assembly according to claim 1, characterized in that: The first motor (10) and the second motor (20) are located on the same side of the gearbox power assembly, the second drive shaft (21) has a center hole, and the first drive shaft (11) can pass through the center hole.

9. The transmission power assembly according to claim 1, characterized in that: The clutch (90) is a wet clutch.

10. Construction machinery, characterized in that: It comprises a rear drive axle, a front drive axle and a gearbox power assembly as claimed in any one of claims 1 to 9, wherein the rear drive axle output shaft (70) is connected to the rear drive axle, and the front drive axle output shaft (80) is connected to the front drive axle.

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