Driving device and engineering machinery

Abstract

The utility model provides a driving device and engineering machinery. The driving device comprises a walking mechanism; the main driving mechanism comprises a walking gear set and a walking motor for driving the walking gear set; the PTO driving mechanism comprises a PTO traction gear set and a PTO motor for driving the PTO traction gear set; the gear shifting mechanism comprises a main gear shifting device and a standby gear shifting device, the main gear shifting device is used for being combined with the walking mechanism and the walking gear set, and the standby gear shifting device is used for being combined with the walking mechanism and the PTO traction gear set. According to the driving device, the main driving mechanism serves as a main power source of the walking mechanism, the PTO motor serves as a standby power source, the power performance of the driving device can be improved under the condition that the power of the walking motor is insufficient, the driving device can adapt to complex construction working conditions, and the economical efficiency and the power performance of the driving device can be guaranteed at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of power devices, and in particular relates to a driving device and engineering machinery. Background Art

[0002] Because construction machinery, such as tractors, often experience significant load fluctuations during operation, they must constantly switch gears to accommodate the demands of the operation. However, existing transmission mechanisms for construction machinery are often complex, expensive, and difficult to maintain, failing to meet both economical and dynamic requirements.

[0003] For example, in Chinese patent publication number CN116852969A, the ISG motor is directly connected to the engine, with a clutch located between the ISG motor and the transmission. Speed ​​ratio adjustment and gear shifting are achieved through synchronizer movement. This solution only has one gear when driving the TM motor in pure electric mode, making it unsuitable for the complex operating conditions of construction machinery such as tractors. Utility Model Content

[0004] The main purpose of the utility model is to provide a driving device and engineering machinery, aiming to solve the technical problem that the speed change structure in the prior art cannot simultaneously meet the economic and dynamic performance of the engineering machinery.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a drive device, which includes: a traveling mechanism; a main driving mechanism, including a traveling gear set and a traveling motor that drives the traveling gear set; a PTO driving mechanism, including a PTO traction gear set and a PTO motor that drives the PTO traction gear set; a shifting mechanism, including a main shifter and a backup shifter, the main shifter is used to combine the traveling mechanism and the traveling gear set, and the backup shifter is used to combine the traveling mechanism and the PTO traction gear set.

[0006] In an embodiment of the present utility model, the driving device also includes a controller, and the travel motor and the PTO motor are both electrically connected to the controller. The controller is used to receive the shift signal of the travel motor and adjust the output torque and speed of the PTO motor according to the shift signal.

[0007] In an embodiment of the present invention, the PTO drive mechanism further includes a PTO output member and a PTO input shaft, the driving end of the PTO input shaft is connected to the PTO motor, the output end is connected to the PTO output member, and the PTO traction gear set is arranged on the PTO input shaft.

[0008] In an embodiment of the present invention, the PTO drive mechanism further includes a PTO clutch provided on the PTO input shaft, and the PTO clutch is connected to the PTO output member.

[0009] In an embodiment of the present invention, the backup shifter is provided on the PTO input shaft or the traveling mechanism.

[0010] In an embodiment of the present utility model, the main drive mechanism includes a main input shaft, the driving end of the main input shaft is connected to the travel motor, at least two travel gear sets are arranged on the main input shaft at axial intervals along the main input shaft, and the main shifter is arranged on the main input shaft or the travel mechanism.

[0011] In an embodiment of the present invention, the number of the traveling gear sets is two, the number of the two traveling gear sets is at least two, and the transmission ratios of the various traveling gear sets are different.

[0012] In an embodiment of the present invention, the main shifter is a clutch sleeve or a synchronizer; and / or the backup shifter is a clutch sleeve or a synchronizer.

[0013] In an embodiment of the present invention, the travel motor and the PTO motor are arranged in parallel and spaced apart; or, the travel motor and the PTO motor are coaxially arranged through a hollow shaft.

[0014] The present utility model also provides an engineering machine, which includes the driving device as described above.

[0015] Through the above technical solution, the driving device provided by the embodiment of the utility model has the following beneficial effects:

[0016] The drive device includes a travel motor and a PTO motor, wherein the main drive mechanism includes at least two pairs of travel gear sets for transmitting the power of the travel motor to the travel mechanism to drive travel. The PTO drive mechanism includes a PTO traction gear set, which is used to transmit the power of the PTO motor to the travel mechanism to drive travel. The shift mechanism includes a main shifter and a backup shifter. The main shifter is used to adjust the power output of the travel motor, and the backup shifter is used to adjust the power output of the PTO motor. The main shifter can combine the travel gear set and the travel mechanism. The backup shifter is in the neutral position, the PTO traction gear set and the travel mechanism are separated, and the driving force of the travel motor is transmitted to the travel mechanism through the travel gear set, so that the travel motor can achieve power drive. When the construction machinery is performing medium-load operations such as plowing, the current gear of the travel motor is insufficient. The driver then shifts gears and presses the shift button, allowing the PTO motor, with its higher rated power and torque, to drive the machinery independently. The backup shifter then couples the travel mechanism with the PTO traction gear set, while the main shifter is in neutral. The PTO motor's driving force is then transmitted to the travel mechanism via the PTO traction gear set. When the construction machinery is performing heavy-load operations such as clearing land, the travel motor alone may be insufficient. In this case, the travel motor can be coupled to the PTO motor. The backup shifter couples the travel mechanism with the PTO traction gear set, while the main shifter couples the travel mechanism with the travel gear set. The PTO motor is then coupled to the travel motor to drive the construction machinery. This decoupling of the drive unit from the engine results in a simple structure and high reliability. Power coupling using the PTO motor when the PTO unit is not operating improves the drive unit's dynamic performance, eliminating the need for an additional motor and allowing the existing PTO motor to be reused, saving costs. The drive device uses the main drive mechanism as the main power source of the traveling mechanism and the PTO motor as the backup power source. It can improve the power performance of the drive device when the traveling motor has insufficient power, so that the drive device can adapt to complex construction conditions. It has a simple structure, fewer driving components, low cost and is easy to control, which can ensure the economy and power of the drive device at the same time.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of a driving device according to one embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of power transmission of a driving device according to one embodiment of the present utility model;

[0021] Figure 3 is a schematic diagram of power transmission of a driving device according to another embodiment of the present utility model;

[0022] Figure 4 is a schematic diagram of power transmission of a driving device according to another embodiment of the present utility model;

[0023] Figure 5 It is a schematic diagram of power transmission of a driving device according to yet another embodiment of the present utility model.

[0024] Description of Reference Numerals

[0025] Label Name Label Name

[0026] 100 Drive unit 23 Main input shaft

[0027] 1 Travel mechanism 3 PTO drive mechanism

[0028] 11 Output shaft 31 PTO motor

[0029] 12 travel wheels 32 PTO traction gear set

[0030] 13 rear axle box 33 PTO output

[0031] 2 Main drive mechanism 34 PTO input shaft

[0032] 21 Travel motor 35 PTO clutch

[0033] 22 Travel gear set 4 Main shifter

[0034] 22a 1st gear set 5 spare shifter

[0035] 22b Second gear set 6 controller DETAILED DESCRIPTION

[0036] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0037] The driving device according to the present invention will be described below with reference to the accompanying drawings.

[0038] like Figures 1 to 5As shown, in an embodiment of the present invention, a drive device 100 includes a traveling mechanism 1, a main drive mechanism 2, a PTO drive mechanism 3, and a shift mechanism. In one embodiment, the traveling mechanism 1 includes an output shaft 11 and traveling wheels 12 connected to the output shaft 11. In other embodiments, the traveling mechanism 1 may include the output shaft 11, a bracket, a front axle, a rear axle, the traveling wheels 12, and other components. The main drive mechanism 2 includes a traveling gear set 22 and a traveling motor 21 that drives the traveling gear set 22. In one embodiment, the main drive mechanism 2 includes at least two traveling gear sets 22, each having a different transmission ratio. The transmission ratios of each traveling gear set 22 are different. The traveling gear sets 22 may be a first gear set 22a, a second gear set 22b, a third gear set, or an N-speed gear set. The main shifter 4 can connect any of the traveling gear sets 22 to the traveling mechanism 1. In another embodiment, the main drive mechanism 2 includes one traveling gear set 22. The present invention does not limit the number of traveling gear sets 22; the number of traveling gear sets 22 can be adjusted based on actual needs. The PTO drive mechanism 3 includes a PTO traction gear set 32 ​​and a PTO motor 31 that drives the PTO traction gear set 32; the shifting mechanism includes a main shifter 4 and a spare shifter 5, the main shifter 4 is used to combine the traveling mechanism 1 and any one of the traveling gear sets 22, and the spare shifter 5 is used to combine the traveling mechanism 1 and the PTO traction gear set 32.

[0039] As will be understood, the drive device 100 in this embodiment is primarily intended for use in construction machinery such as tractors. It can be used in extended-range hybrid tractors, where the engine drives the generator, while the travel motor 21 and PTO motor 31 serve as power sources to drive the travel wheels 12 and the PTO device. The travel mechanism 1 also includes a rear axle box 13 mounted on the output shaft 11. The driving force transmitted to the output shaft 11 by the travel motor 21 and PTO motor 31 is transmitted to at least two travel wheels 12 via the rear axle box 13. The rear axle box 13 coordinates the rotational speeds of the left and right travel wheels 12 via a differential, ensuring flexible maneuverability of the construction machinery during cornering. Specifically, the rear axle box 13 can be located between the backup shifter 5 and the travel wheels 12.

[0040] The drive device 100 in this embodiment includes a travel motor 21 and a PTO motor 31, wherein the travel gear set 22 of the main drive mechanism 2 is used to transmit the power of the travel motor 21 to the travel mechanism 1 to drive travel. The PTO drive mechanism 3 includes a PTO traction gear set 32, which is used to transmit the power of the PTO motor 31 to the travel mechanism 1 to drive travel. The shift mechanism includes a main shifter 4 and a backup shifter 5. The main shifter 4 is used to adjust the power output of the travel motor 21, and the backup shifter 5 is used to adjust the power output of the PTO motor 31. The main shifter 4 can connect the travel gear set 22 and the output shaft 11 of the travel mechanism 1. When the backup shifter 5 is in the neutral position, the PTO traction gear set 32 ​​is separated from the travel mechanism 1, and the driving force of the travel motor 21 is transmitted to the travel mechanism 1 via the travel gear set 22, so that the travel motor 21 can achieve power drive. When the construction machinery is performing medium-load operations such as plowing, the current gear driving force of the travel motor 21 is insufficient. At this time, the driver makes a gear shift decision and presses the gear shift button, and the PTO motor 31 with larger rated power and torque can be used to drive the travel alone. At this time, the power transmission of the drive device 100 is as follows: Figure 3 As shown. The backup shifter 5 combines the travel mechanism 1 and the PTO traction gear set 32. The main shifter 4 is in the neutral position. The driving force of the PTO motor 31 is transmitted to the travel mechanism 1 through the PTO traction gear set 32. When the construction machinery is performing heavy load operations such as land reclamation, the driving power of the travel motor 21 alone is insufficient. In this case, the travel motor 21 can be power-coupled with the PTO motor 31. The power transmission is as follows. Figure 5 As shown. The backup shifter 5 connects the travel mechanism 1 and the PTO traction gear set 32, while the main shifter 4 connects the travel mechanism 1 and the travel gear set 22. The PTO motor 31 is coupled with the travel motor 21 to drive the construction machine. The drive device 100 in this embodiment is decoupled from the engine, resulting in a simple structure and high reliability. The PTO motor 31 is used for power coupling when the PTO device is not operating, improving the power performance of the drive device 100. This eliminates the need for an additional motor and allows the existing PTO motor 31 to be reused, saving costs.

[0041] The drive device 100 in this embodiment uses the main drive mechanism 2 as the main power source of the walking mechanism 1 and the PTO motor 31 as the backup power source. It can improve the power performance of the drive device 100 when the walking motor 21 is insufficiently powered, so that the drive device 100 can adapt to complex construction conditions. It has a simple structure, fewer driving components, low cost and is easy to control, which can simultaneously ensure the economy and power of the drive device 100.

[0042] Specifically, the main shifter 4 can be a clutch sleeve or synchronizer, and the backup shifter 5 can also be a clutch sleeve or synchronizer. The clutch sleeve in this embodiment shifts gears via axial movement, making it suitable for helical gear transmissions. Operation is simple, and the shift fork's movement during shifting is minimal, reducing impact and extending the life of the shifting components. The synchronizer automatically coordinates the speeds of the input shaft and the running gear 1, ensuring quick and smooth shifting, reducing noise, and improving driving comfort.

[0043] In one embodiment, the driving device 100 further includes a controller 6, and the travel motor 21 and the PTO motor 31 are both electrically connected to the controller 6. The controller 6 is used to receive the shift signal of the travel motor 21 and adjust the output torque and speed of the PTO motor 31 according to the shift signal.

[0044] When the tractor needs to transfer to a new field at high speed after finishing operations such as sowing, the driver presses the gear button according to the working conditions and sends a gear shift signal from the first gear to the second gear to the controller 6. Figure 2 The first gear power transmission of the drive device 100 shown will become as follows Figure 4 The driving device 100 is shown as the second gear power transmission. In order to ensure that the power is not interrupted during the tractor shifting process, the present embodiment adopts the traction gear of the PTO motor 31 to perform torque compensation.

[0045] Specifically, when the controller 6 receives a shift signal from first to second gear, it adjusts the torque and speed of the PTO motor 31, engaging the backup shifter 5 with the PTO traction gear set 32. At this point, the travel motor 21 unloads torque, and the main shifter 4 disengages from the first gear set 22a. After adjusting the speed of the travel motor 21, the main shifter 4 engages with the second gear set 22b. Finally, the PTO motor 31 is torque-unloaded, and the backup shifter 5 disengages from the PTO traction gear set 32, completing the tractor's power shift from first to second gear. Gear shifting can be accomplished simply by the driver's button operation, simplifying operation. By coordinating the torque between the PTO motor 31 and the travel motor 21 and providing torque compensation during the shift process, the shift process remains uninterrupted, avoiding shift jerk and improving driving comfort.

[0046] Specifically, the PTO drive mechanism 3 also includes a PTO output member 33 and a PTO input shaft 34. The driving end of the PTO input shaft 34 is connected to the PTO motor 31, and the output end is connected to the PTO output member 33. The PTO traction gear set 32 ​​is disposed on the PTO input shaft 34 and is located between the PTO motor 31 and the PTO output member 33. In this embodiment, the PTO traction gear set 32 ​​is disposed on the PTO input shaft 34, and the PTO input shaft 34 can output power to the PTO output member 33. This allows the PTO traction gear set 32 ​​and the PTO output member 33 to share the same PTO input shaft 34, resulting in a simple structure and easy control. It should be noted that by adjusting the backup shifter 5 and the PTO clutch 35, the PTO motor 31 can simultaneously drive the road wheels 12 and the PTO output member 33, independently drive the road wheels 12, or independently drive the PTO output member 33, fully utilizing the driving function of the PTO motor 31 and avoiding the need for an additional motor.

[0047] like Figure 1 As shown, the PTO drive mechanism 3 also includes a PTO clutch 35 provided on the PTO input shaft, and the PTO input shaft 34 is connected to the PTO output member 33 through the PTO clutch 35. The PTO output member 33 in this embodiment can output power to the working parts of the engineering machinery (such as a rotary tiller, etc.) as a PTO device. When the working parts are operating, the PTO clutch 35 is engaged, and the PTO motor 31 can transmit power through the PTO input shaft 34 and the PTO clutch 35. When the tractor is performing medium-load operations such as plowing, the first gear driving force of the travel motor 21 is insufficient. At this time, the driver makes a decision to shift gears and presses the traction gear button in the cab. The controller 6 can receive the traction gear signal transmitted by the traction gear button and start the PTO motor 31 with a larger rated power and torque to drive the tractor alone. At this time, the power transmission of the drive device 100 is as follows: Figure 3 At this point, the backup shifter 5 is engaged with the PTO traction gear set 32, the PTO clutch 35 is disengaged, and the main shifter 4 is in neutral. The driving force of the PTO motor 31 is transmitted to the output shaft 11 via the PTO traction gear set 32, and ultimately to the travel wheels 12 via the rear axle case 13. By providing the PTO clutch 35 between the PTO output member 33 and the PTO traction gear set 32, the drive device 100 of this embodiment can adapt to a wider range of operating conditions.

[0048] Specifically, the main drive mechanism 2 includes a main input shaft 23, the drive end of which is connected to the travel motor 21. At least two travel gear sets 22 are spaced apart along the axial direction of the main input shaft 23. The main shifter 4 is disposed on the main input shaft 23 or the output shaft 11 of the travel mechanism 1. In this embodiment, the at least two travel gear sets 22 are coaxially arranged, simplifying the structure and eliminating the need for additional transmission components. A single main input shaft 23 and travel motor 21 can simultaneously drive the at least two travel gear sets 22.

[0049] It should be noted that in one embodiment, there are two travel gear sets 22, namely a first-speed gear set 22a and a second-speed gear set 22b. The first-speed gear set 22a and the second-speed gear set 22b share a common main shifter 4, which is located between the first-speed gear set 22a and the second-speed gear set 22b. This embodiment, in which the first-speed gear set 22a and the second-speed gear set 22b share a common main shifter 4, simplifies the structure and control, saves shifting components, and reduces the cost of the drive device 100. In other embodiments, more travel gear sets 22 can be designed as needed to achieve more speed ratios. Multiple travel gear sets 22 are spaced apart along the axial direction of the main input shaft 23, and a main shifter 4 can be provided between any two adjacent travel gear sets 22. If the main shifter 4 is a meshing sleeve, it can be located on the main input shaft 23 or the output shaft 11 of the travel mechanism 1.

[0050] The gears of the driving device 100 of this embodiment include: 1st gear, 2nd gear, 3rd gear, 4th gear, N gear and R gear. 1st gear to 4th gear are forward gears, N gear is neutral gear (no power output), and R gear is reverse gear.

[0051] The first gear can be used for the tractor to turn around at low speed and to move forward at low speed when the PTO output member 33 is working;

[0052] The second gear can be used for high-speed transition and high-speed forward movement when the PTO output part 33 is working;

[0053] Third gear can be used to get the tractor out of trouble and for heavy-load operations;

[0054] Fourth gear can be used for medium-load work with the tractor;

[0055] N gear can be used for working conditions such as tractor maintenance trailer;

[0056] R gear can be used for reversing of the tractor.

[0057] Specifically, the first gear power transmission direction of the driving device 100 is as follows: Figure 2The main shifter 4 is coupled to the first gear set 22a, the backup shifter 5 is in the neutral position, and the driving force of the travel motor 21 is transmitted to the output shaft 11 via the first gear set 22a, and finally transmitted to the travel wheel 12 via the rear axle box 13.

[0058] When the tractor is doing medium-load operations such as plowing, the driving force of the travel motor 21 in the first gear is insufficient. At this time, the driver makes a gear shift decision and presses the traction gear button (fourth gear). The PTO motor 31 with larger rated power and torque drives the travel wheel 12 to move alone. At this time, the power transmission of the drive device 100 is as follows: Figure 3 The backup shifter 5 is engaged with the PTO traction gear set 32, the PTO clutch 35 is disengaged, the main shifter 4 is in the neutral position, and the driving force of the PTO motor 31 is transmitted to the output shaft 11 through the PTO traction gear set 32, and finally transmitted to the travel wheel 12 through the rear axle box 13.

[0059] When the tractor is engaged in heavy load operations such as land reclamation, the driving power of the travel motor 21 alone is insufficient. At this time, the drive device 100 is engaged in the coupling gear (third gear) to couple the travel motor 21 with the PTO motor 31. The power transmission of the coupling gear is as follows: Figure 5 As shown. At this time, the PTO output member 33 is inoperative, the PTO clutch 35 is disengaged, the backup shifter 5 is engaged with the PTO traction gear set 32, the main shifter 4 is engaged with the first gear gear set 22a, and the PTO motor 31 is coupled with the travel motor 21 to drive the tractor. This embodiment of the drive device 100 utilizes the PTO motor 31 to perform power coupling when the PTO output member 33 is inoperative, improving the tractor's power performance. This eliminates the need for a separate motor and allows the existing PTO motor 31 to be reused, saving costs. Furthermore, the drive device 100 has a simple structure and high reliability.

[0060] like Figure 1 As shown, in one embodiment, both the backup shifter 5 and the main shifter 4 utilize a meshing sleeve. Both the backup shifter 5 and the main shifter 4 are mounted on the output shaft 11, with the backup shifter 5 positioned between the main shifter 4 and the rear axle case 13. This reduces the distance between the first-speed gear set 22a and the second-speed gear set 22b, simplifying the structure of the drive device 100 while also achieving miniaturization. In other embodiments, the backup shifter 5 may be mounted on the PTO input shaft 34.

[0061] Specifically, the travel motor 21 and the PTO motor 31 can be arranged in parallel and spaced apart. In this embodiment, the travel motor 21 and the PTO motor 31 are arranged in parallel, with the main input shaft 23, the output shaft 11, and the PTO input shaft 34 arranged in parallel and spaced apart. The travel motor 21 and the PTO motor 31 are located on the same side of the drive device 100, and the travel wheel 12 is located on the other side of the drive device 100. This simple structure facilitates the assembly and connection of the travel mechanism 1, the main drive mechanism 2, and the PTO drive mechanism 3. The travel motor 21 and the PTO motor 31 can also be coaxially arranged via a hollow shaft. The coaxial arrangement of the travel motor 21 and the PTO motor 31 facilitates the corresponding arrangement of the components of the main drive mechanism 2 and the PTO drive mechanism 3, thereby improving the matching accuracy between the components of the drive device 100.

[0062] The present invention also provides a construction machine comprising the aforementioned drive device 100. The specific structure of the drive device 100 is described in detail in the aforementioned embodiments. Because the construction machine utilizes all of the technical solutions of all of the aforementioned embodiments, it possesses at least all of the beneficial effects provided by the technical solutions of the aforementioned embodiments, and therefore will not be detailed here. In one embodiment, the construction machine can be used with a hybrid tractor or a pure electric tractor. Specifically, the construction machine can be used with an extended-range tractor.

[0063] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0064] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A driving device, characterized in that: The driving device (100) comprises: Walking mechanism (1); A main driving mechanism (2) includes a traveling gear set (22) and a traveling motor (21) driving the traveling gear set (22); A PTO drive mechanism (3) comprising a PTO traction gear set (32) and a PTO motor (31) driving the PTO traction gear set (32); The shift mechanism comprises a main shifter (4) and a backup shifter (5), wherein the main shifter (4) is used to combine the traveling mechanism (1) and the traveling gear set (22), and the backup shifter (5) is used to combine the traveling mechanism (1) and the PTO traction gear set (32).

2. The driving device according to claim 1, characterized in that The driving device (100) further includes a controller (6), the travel motor (21) and the PTO motor (31) are both electrically connected to the controller (6), and the controller (6) is used to receive a shift signal from the travel motor (21) and adjust the output torque and speed of the PTO motor (31) according to the shift signal.

3. The driving device according to claim 1, characterized in that The PTO drive mechanism (3) further comprises a PTO output member (33) and a PTO input shaft (34), wherein the driving end of the PTO input shaft (34) is connected to the PTO motor (31), and the output end is connected to the PTO output member (33), and the PTO traction gear set (32) is arranged on the PTO input shaft (34).

4. The driving device according to claim 3, characterized in that The PTO drive mechanism (3) further comprises a PTO clutch (35) arranged on the PTO input shaft (34), and the PTO clutch (35) is connected to the PTO output member (33).

5. The driving device according to claim 4, characterized in that The backup shifter (5) is arranged on the PTO input shaft (34) or the traveling mechanism (1).

6. The driving device according to any one of claims 1 to 5, characterized in that The main drive mechanism (2) includes a main input shaft (23), a driving end of the main input shaft (23) is connected to the travel motor (21), at least two travel gear sets (22) are arranged on the main input shaft (23) at intervals along the axial direction of the main input shaft (23), and the main shifter (4) is arranged on the main input shaft (23) or the travel mechanism (1).

7. The driving device according to any one of claims 1 to 5, characterized in that: The number of the traveling gear sets (22) is at least two, and the transmission ratios of the various traveling gear sets (22) are different.

8. The driving device according to any one of claims 1 to 5, characterized in that: The main shifter (4) is a meshing sleeve or a synchronizer; and / or, The standby shifter (5) is a meshing sleeve or a synchronizer.

9. The driving device according to any one of claims 1 to 5, characterized in that The travel motor (21) and the PTO motor (31) are arranged in parallel and spaced apart; or, The travel motor (21) and the PTO motor (31) are coaxially arranged via a hollow shaft.

10. An engineering machine, characterized in that: The engineering machine comprises the driving device (100) according to any one of claims 1 to 9.

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