Dual-mode power system of tractor

Abstract

The utility model discloses a dual-mode power system of a tractor, which relates to the technical field of vehicle power, and comprises a walking transfer case, the output end of the walking transfer case is used for connecting a walking assembly, and the input end of the walking transfer case is provided with a main driving force and an auxiliary power in parallel; the main driving force comprises an engine, the power end of the engine is connected with an automatic gearbox, and the output end of the automatic gearbox is in power connection with the input end of the walking transfer case; the auxiliary power comprises an auxiliary motor, the power end of the auxiliary motor is connected with an auxiliary gearbox, and the output end of the auxiliary gearbox is in power connection with the input end of the walking transfer case; the auxiliary gearbox comprises at least one high-speed auxiliary gear and at least one low-speed auxiliary gear; the auxiliary power includes a torque boost assist mode using a high speed assist gear and a high torque output mode using a low speed assist gear. Required high-torque output can be quickly formed, forced stop is reduced, and continuous operation of operation machinery is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of vehicle power technology, and in particular to a dual-mode power system for tractors. Background Technology

[0002] Tractors are used to traction and drive mobile machinery to complete various mobile tasks, including tilling, sowing, and harvesting. In the tractor's power system, the engine output is distributed, with one portion driving the tractor's movement after connecting to the gearbox, and the other portion being output to the working machinery. During operations such as tilling, the working machinery often experiences a sudden increase in resistance due to soil changes, encountering obstacles such as rocks or tree roots. In this situation, the engine's traction torque output is insufficient to drive the working machinery further. Subsequently, under program control, the gearbox shifts to a lower gear to output higher torque and resume traction. Although this shifting process is relatively brief, only about 0.5 seconds, during this brief moment, the entire tractor and working machinery are in a state of losing traction power. The sudden increase in resistance can bring the tractor and working machinery to a near stop. After the gearbox shifts, the engine essentially needs to overcome this large resistance to restart, requiring even more torque, making restarting difficult, and even causing stalling. This forced stop also affects the continuous operation of the working machinery. Therefore, a power solution is needed to address the situation of sudden increases in resistance during operation and improve the current situation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a dual-mode power system for tractors, which can quickly generate the required high torque output, reduce the occurrence of forced stops, and facilitate continuous operation of the machinery.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a dual-mode power system for tractors, including a travel transfer case, the output end of which is used to connect to the travel assembly, and the input end of which is connected in parallel with a main driving force and an auxiliary power.

[0005] The main driving force includes an engine, the power end of which is connected to an automatic transmission, and the output end of the automatic transmission is connected to the input end of the travel transfer case.

[0006] The auxiliary power includes an auxiliary motor, the power end of which is connected to an auxiliary gearbox, and the output end of the auxiliary gearbox is connected to the input end of the travel transfer case; the auxiliary gearbox includes at least one high-speed auxiliary gear and at least one low-speed auxiliary gear.

[0007] The auxiliary power includes a torque-boosting auxiliary mode using the high-speed auxiliary gear and a high-torque output mode using the low-speed auxiliary gear.

[0008] As a preferred technical solution, the auxiliary power also includes a battery pack, which provides electrical energy to the auxiliary motor.

[0009] As a preferred technical solution, the capacity of the battery pack is 15-40 kWh.

[0010] As a preferred technical solution, the auxiliary motor also functions as a reverse generator.

[0011] As a preferred technical solution, the automatic transmission is an AMT (Automated Manual Transmission).

[0012] As a preferred technical solution, a power distribution box is further provided between the power end of the engine and the automatic transmission. The input end of the power distribution box is connected to the power end of the engine, the first output end of the power distribution box is connected to the input end of the automatic transmission, and the second output end of the power distribution box is connected to a PTO mechanism.

[0013] As a preferred technical solution, an auxiliary generator is connected in series between the first output end of the power distribution box and the input end of the automatic transmission. The auxiliary generator is used to supplement the auxiliary power with electrical energy.

[0014] As a preferred technical solution, the power distribution box is also provided with a third output terminal, which is connected to an auxiliary generator, and the auxiliary generator is used to supplement the auxiliary power with electrical energy.

[0015] Due to the adoption of the above technical solution, the tractor's dual-mode power system includes a travel transfer case. The output end of the travel transfer case is connected to the travel assembly, and the input end of the travel transfer case is connected in parallel with a main drive force and an auxiliary power force. The main drive force includes an engine, the power end of which is connected to an automatic transmission, and the output end of the automatic transmission is poweredly connected to the input end of the travel transfer case. The auxiliary power force includes an auxiliary motor, the power end of which is connected to an auxiliary transmission, and the output end of the auxiliary transmission is poweredly connected to the input end of the travel transfer case. The auxiliary transmission includes at least one high-speed auxiliary gear and at least one low-speed auxiliary gear. The auxiliary power force includes a torque-boosting auxiliary mode using the high-speed auxiliary gear and a high-torque output mode using the low-speed auxiliary gear. In the operation of traction machinery, when encountering a sudden increase in resistance, the auxiliary power system switches to torque-boosting mode. This means the auxiliary gearbox is in high-speed auxiliary gear, and the auxiliary motor drives the output of the auxiliary gearbox to provide high-speed output, supplementing the torque output of the automatic transmission in the main drive system. Together, they achieve a high torque output sufficient to overcome the sudden increase in resistance. However, if the torque output of both is still insufficient, the auxiliary power system switches to high-torque output mode. This means the auxiliary gearbox switches to low-speed auxiliary gear, and the auxiliary motor outputs high speed, providing a large torque output at the output of the auxiliary gearbox, temporarily replacing the engine for traction drive. The automatic transmission can then perform gear shifting. After shifting, the output of the automatic transmission reaches the required torque output, and the auxiliary power system stops outputting torque, thus enabling traction to overcome the sudden increase in resistance under continuous high torque output. Therefore, this invention reduces the occurrence of forced stops and facilitates continuous operation of the machinery. Attached Figure Description

[0016] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0017] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the auxiliary power output provided in an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the auxiliary generator supplementing electrical energy when the auxiliary power is provided and output according to an embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the auxiliary motor reversing charge when the auxiliary power does not provide output, according to an embodiment of this utility model.

[0021] Figure 5This is a schematic diagram of the structure of an auxiliary generator installed at the third output end of the power distribution box according to an embodiment of this utility model.

[0022] In the diagram: 1-Walking assembly; 2-Walking transfer case; 3-Main drive; 31-Engine; 32-Automatic transmission; 4-Auxiliary power; 41-Auxiliary motor; 42-Auxiliary transmission; 43-Battery pack; 5-Power distribution box; 51-PTO mechanism; 6-Auxiliary generator. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0024] like Figure 1 As shown, the tractor's dual-mode power system includes a travel transfer case 2. The output end of the travel transfer case 2 is connected to the travel assembly 1, thereby transmitting traction drive force to the travel assembly 1 to achieve traction drive. Conventionally, the travel assembly 1 includes a set of front wheels and a set of rear wheels. In actual use, the output end of the travel transfer case 2 can be connected to drive the front wheels or the rear wheels individually, or it can be connected to drive both the front wheels and the rear wheels simultaneously; this is not limited here. The travel transfer case 2 is a component that realizes the transmission of power from the input end to the output end, and can be implemented using conventional transmission methods such as gear transmission or chain belt transmission; this is not limited here.

[0025] The input end of the travel transfer case 2 is equipped with a main driving force 3 and an auxiliary power 4 connected in parallel, so that the main driving force 3 and the auxiliary power 4 cooperate to complete the required power output under different working conditions.

[0026] The main driving force 3 includes an engine 31, the power end of which is connected to an automatic transmission 32. The output end of the automatic transmission 32 is connected to the input end of the transfer case 2. The automatic transmission 32 can automatically switch between high and low gears according to torque conditions. In this embodiment, the automatic transmission 32 is an AMT (Automated Manual Transmission).

[0027] The auxiliary power 4 includes an auxiliary motor 41, the power end of which is connected to an auxiliary gearbox 42. The output end of the auxiliary gearbox 42 is poweredly connected to the input end of the travel transfer case 2. In actual installation, the two ends of the input shaft of the travel transfer case 2 can form two coaxial input ends. The output ends of the automatic gearbox 32 and the auxiliary gearbox 42 are poweredly connected to these two input ends respectively, thereby realizing the parallel connection of the main driving force 3 and the auxiliary power 4.

[0028] The auxiliary gearbox 42 includes at least one high-speed auxiliary gear and at least one low-speed auxiliary gear to cooperate with the auxiliary motor 41 in providing the required auxiliary power 4 output under different operating conditions. Correspondingly, the auxiliary power 4 includes a torque-boosting auxiliary mode using the high-speed auxiliary gear and a high-torque output mode using the low-speed auxiliary gear. The working principle of the auxiliary power 4 modes will be uniformly introduced later and will not be repeated here. Conventionally, the high-speed auxiliary gear is the gear with a smaller speed ratio from the output end of the auxiliary motor 41 to the output end of the auxiliary gearbox 42, and the low-speed auxiliary gear is the gear with a larger speed ratio from the output end of the auxiliary motor 41 to the output end of the auxiliary gearbox 42.

[0029] Conventionally, the auxiliary power source 4 also includes a battery pack 43, which provides electrical energy to the auxiliary motor 41. Preferably, the auxiliary motor 41 also functions as a reverse generator, so that when the auxiliary power source 4 is not normally providing auxiliary power output and the battery pack 43 has a low charge level, it can charge the battery pack 43 in reverse. Thus, the auxiliary motor 41 is a motor that combines the functions of a motor and a generator, such as a motor with a stator using a winding coil structure and a rotor using an electromagnet. When used as a motor, the rotor is energized, the stator receives current input, and the rotor rotates. When used as a generator, the rotor is energized, and the rotor rotates with the help of external force, generating current in the stator to achieve power generation. Of course, when it is not needed to be used as a motor or a generator, the rotor in the auxiliary motor 41 can be de-energized, allowing the rotor to idle.

[0030] In this embodiment, a power distribution box 5 is also provided between the power end of the engine 31 and the automatic transmission 32. The input end of the power distribution box 5 is connected to the power end of the engine 31, the first output end of the power distribution box 5 is connected to the input end of the automatic transmission 32, and the second output end of the power distribution box 5 is connected to a PTO mechanism 51. The power of the engine 31 is transmitted to traction and operation respectively through the power distribution box 5. The power distribution box 5 can also be implemented using conventional transmission methods such as gear transmission or chain transmission, which is not limited here.

[0031] Preferably, an auxiliary generator 6 is connected in series between the first output terminal of the power distribution box 5 and the input terminal of the automatic transmission 32. The auxiliary generator 6 is used to supplement the auxiliary power 4 with electrical energy, and also supplements the battery pack 43 with low charge during the auxiliary output process of the auxiliary power 4. The auxiliary generator 6 is located between the power distribution box 5 and the automatic transmission 32, and is unaffected by gear shifting in the automatic transmission 32, maintaining continuous power generation capability by receiving the drive of the engine 31. The auxiliary generator 6 can be implemented using an excitation motor; when power generation is not required, the excitation coil is de-energized and does not perform its power generation function. Of course, if... Figure 5 As shown, in this embodiment, the power distribution box 5 may also be provided with a third output terminal, which is connected to an auxiliary generator 6. The auxiliary generator 6 is used to supplement the auxiliary power 4 with electrical energy. This configuration of the auxiliary generator 6 is also possible and should be within the protection scope of this utility model.

[0032] In addition to the above structure, the power distribution box 5 may also be provided with a fourth output end for connecting a hydraulic pump, etc.

[0033] In this embodiment, when the traction machinery is in operation, the automatic transmission 32 in the main driving force 3 is fixed at a specified gear according to the torque output required for conventional traction.

[0034] like Figure 2 As shown, when the resistance increases suddenly due to soil changes or obstacles in the soil, the automatic transmission 32 is required to provide greater torque based on torque demand detection or load conditions, and there are two operating conditions at this time.

[0035] The first type is for working conditions where the sudden increase in resistance is relatively small, such as when tilling is only done from sandy soil to muddy soil or when encountering fine tree roots. In this case, the auxiliary power 4 switches to torque boosting mode. More specifically, the auxiliary gearbox 42 is in high-speed auxiliary gear, and the auxiliary motor 41 drives the output end of the auxiliary gearbox 42 to provide high-speed output, which supplements the torque output of the automatic gearbox 32 in the main drive force 3. Together, they achieve a high torque output that can overcome the sudden increase in resistance and realize continuous traction operation.

[0036] In this operating condition, if situations arise where tree roots are difficult to break during tilling operations, the torque output by the main driving force 3 and the auxiliary power 4 is insufficient to meet the demand. The auxiliary power 4 immediately switches to a high-torque output mode. More specifically, the auxiliary gearbox 42 switches to a low-speed auxiliary gear, and the auxiliary motor 41 outputs a high speed, providing a large torque output at the output end of the auxiliary gearbox 42 to temporarily replace the engine 31 for traction drive. Then, the automatic gearbox 32 switches to the required gear based on torque detection or load conditions. After the gear shift, the output end of the automatic gearbox 32 reaches the required torque output, and the auxiliary power 4 stops its auxiliary output, thus achieving traction by overcoming a sudden increase in resistance under continuous high torque output.

[0037] The second type is a working condition where the resistance increases sharply, such as when encountering thick tree roots or rocks during tillage. In this case, the current torque output of the main driving force 3 is significantly different from the required torque. At this time, the auxiliary power 4 directly switches to high torque output mode to take over the temporary traction drive from the engine 31. The automatic transmission 32 switches to the required gear, and after the gear shift, it is driven again by the main driving force 3, and the auxiliary power 4 stops outputting.

[0038] In both of the above operating conditions, the use of the four auxiliary power modes achieves the purpose of traction drive under continuous high torque output.

[0039] After passing through the area of ​​sudden increase in resistance, the tractor resumes normal traction operation. The torque demand at the output end of the automatic transmission 32 decreases. At this time, the auxiliary power 4 switches to a high torque output mode. The auxiliary motor 41 operates at medium to high speed, enabling the output end of the auxiliary transmission 42 to reach the required torque output, taking over from the engine 31 for temporary traction. The automatic transmission 32 switches to the required high gear, and then the main drive force 3 resumes driving the traction. The auxiliary power 4 stops outputting, thereby achieving economical power output while maintaining the required torque.

[0040] Furthermore, when the auxiliary power 4 is not needed under normal circumstances, and when the battery pack 43 has a low charge, such as Figure 4 As shown, the auxiliary motor 41 can reverse charge the battery pack 43. In this case, the auxiliary power 4 switches to a high-speed auxiliary gear torque-boosting mode to fully utilize the rotation drive of the engine 31 for power generation. Since the auxiliary motor 41 responds quickly by utilizing the instantaneous high-current discharge of the battery pack 43 when the auxiliary power 4 is output, and the battery pack 43 consumes energy quickly, if the battery pack 43 experiences low charge during the output of the auxiliary power 4, such as... Figure 3As shown, the auxiliary generator 6 charges the battery pack 43 to maintain the normal auxiliary function of the auxiliary power 4 in this embodiment. With the above dual charging function, the battery pack 43 can be a low-capacity battery pack, specifically, the capacity of the battery pack 43 is 15-40 kWh, in order to reduce the overall component cost while meeting the power supply requirements of the auxiliary power 4.

[0041] This embodiment utilizes the instantaneous rapid response of the auxiliary motor 41 and the cooperation of the auxiliary gearbox 42 to quickly generate a large torque output under different sudden increases in resistance conditions, thereby achieving the purpose of overcoming sudden increases in resistance and maintaining traction drive. Under the structural principle of this embodiment, for example, in a tractor model that originally uses a 460-horsepower engine, this embodiment can be configured with a 160-kW auxiliary motor 41 and the aforementioned battery pack 43 to achieve rapid coordination and continuous high torque output. In this case, the engine 31 only needs to have the torque output capability to drive conventional traction. Therefore, the engine 31 in the main drive force 3 can be reduced from 460 horsepower to 300 horsepower, and the cost of this component in the power system will be significantly reduced. Even with the addition of auxiliary motor 41, auxiliary gearbox 42, battery pack 43, and auxiliary generator 6, the cost of the entire power system can still be similar to the original. However, during operation, the energy consumption of the 300-horsepower engine 31 is greatly reduced. Therefore, this embodiment can form a tractor power system with high torque output instantaneous response and continuous holding function without significantly changing the system cost and reducing the later use cost. In actual operation, it can reduce the occurrence of forced stops and facilitate continuous operation of the machinery.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dual-mode power system for a tractor, including a travel transfer case, wherein the output end of the travel transfer case is used to connect to the travel assembly, characterized in that: The input end of the walking transfer case is equipped with a main driving force and an auxiliary power in parallel; The main driving force includes an engine, the power end of which is connected to an automatic transmission, and the output end of the automatic transmission is connected to the input end of the travel transfer case. The auxiliary power includes an auxiliary motor, the power end of which is connected to an auxiliary gearbox, and the output end of the auxiliary gearbox is connected to the input end of the travel transfer case; the auxiliary gearbox includes at least one high-speed auxiliary gear and at least one low-speed auxiliary gear. The auxiliary power includes a torque-boosting auxiliary mode using the high-speed auxiliary gear and a high-torque output mode using the low-speed auxiliary gear.

2. The tractor dual-mode power system as described in claim 1, characterized in that: The auxiliary power also includes a battery pack, which provides electrical energy to the auxiliary motor.

3. The tractor dual-mode power system as described in claim 2, characterized in that: The battery pack has a capacity of 15–40 kWh.

4. The tractor dual-mode power system as described in claim 2, characterized in that: The auxiliary motor also functions as a reverse generator.

5. The tractor dual-mode power system as described in claim 1, characterized in that: The automatic transmission is an AMT (Automated Manual Transmission).

6. The tractor dual-mode power system according to any one of claims 1 to 5, characterized in that: A power distribution box is also provided between the power end of the engine and the automatic transmission. The input end of the power distribution box is connected to the power end of the engine, the first output end of the power distribution box is connected to the input end of the automatic transmission, and the second output end of the power distribution box is connected to a PTO mechanism.

7. The tractor dual-mode power system as described in claim 6, characterized in that: An auxiliary generator is connected in series between the first output terminal of the power distribution box and the input terminal of the automatic transmission. The auxiliary generator is used to supplement the auxiliary power with electrical energy.

8. The tractor dual-mode power system as described in claim 6, characterized in that: The power distribution box is also equipped with a third output terminal, which is connected to an auxiliary generator. The auxiliary generator is used to supplement the auxiliary power with electrical energy.

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