Power dividing type ECVT hybrid power continuously variable transmission and tractor

Abstract

The invention discloses a power split type ECVT hybrid power continuously variable transmission and a tractor in the technical field of tractor transmission. The power split type ECVT hybrid power continuously variable transmission comprises a generator directly connected with an engine crankshaft, and a rotor shaft of the generator is a through shaft; a through shaft of the generator is connected with the PTO gearbox; one end of the driving motor is connected with a shunting planet row, and the driving motor drives the vehicle to run through the shunting planet row; the driving motor is electrically connected with the generator; the engine supplies power to the power battery and the driving motor through the generator, and meanwhile the PTO gearbox is driven through a through shaft of the generator. A hydraulic shock absorber is arranged between the engine and the shunting planet row; according to the invention, part of mechanical transmission is replaced by motor driving, so that stepless speed change is realized through motor driving; and the engine crankshaft is directly connected with the generator rotor shaft, so that the PTO rotating speed is not limited by the vehicle speed any more, decoupling of the PTO rotating speed and the vehicle running speed is achieved, and the multi-working-condition adaptability and the working efficiency are improved.

Description

Technical Field

[0001] This invention relates to a power-split ECVT hybrid continuously variable transmission and a tractor, belonging to the field of tractor transmission technology. Background Technology

[0002] Currently, hybrid and new energy technologies are being used more and more widely in the commercial vehicle sector and are becoming more mature. However, in the domestic high-horsepower tractor sector, the reliability of core transmission components such as power shift transmissions and CVTs remains a constraint on the promotion and application of products.

[0003] According to Chinese patent CN214728147U, an electric drive tractor CVT powertrain with a through-hole PTO structure is described. In this invention, the PTO speed and the motor speed are strongly correlated and not decoupled. When the tractor is driving implements that require the use of PTO, such as balers and rotary tillers, the PTO speed must be matched with the vehicle speed, which will affect the working effect and efficiency, and may even fail to meet the working conditions.

[0004] Furthermore, traditional high-horsepower tractors rely heavily on mechanical power shifting or CVT, which are prone to reliability issues due to their complex structure and large load impacts. In addition, since the output speed of the PTO depends on the speed of the drive motor, and the drive motor is affected by the vehicle speed, the operating and traveling speeds of the PTO cannot be adjusted independently. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings in related technologies and solve the problems of insufficient reliability of core transmission components in existing high-horsepower tractors and low operating efficiency caused by strong coupling between PTO speed and travel speed.

[0006] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution: Firstly, a power-split ECVT hybrid continuously variable transmission is provided, comprising: engine; A generator directly connected to the crankshaft of the engine, wherein the rotor shaft of the generator is a through shaft; The PTO gearbox, wherein the through shaft of the generator is connected to the PTO gearbox; A drive motor is connected to a shunt planetary gear set at one end, and the drive motor drives the vehicle through the shunt planetary gear set. The power battery is electrically connected to the drive motor and generator. The engine supplies power to the power battery and drive motor via a generator, and drives the PTO gearbox via the generator's through shaft. A hydraulic damper is installed between the engine and the split planetary gear set.

[0007] Furthermore, the hydraulic damper includes a driving wheel, a transmission medium, and a driven wheel; a gap is provided between the driving wheel and the driven wheel, and the gap is filled with the transmission medium.

[0008] Furthermore, one end of the split planetary gear set is connected to a shift mechanism, which is connected to the vehicle's drive axle.

[0009] Furthermore, the gearbox also includes a clutch device, which is disposed between the shift mechanism and the drive axle.

[0010] Furthermore, it also includes: a two-in-one controller and a complete machine controller; The two-in-one controller is electrically connected to the drive motor and the power battery; The overall controller is electrically connected to the drive motor, the generator, and the power battery.

[0011] Furthermore, the drive motor is a reversible motor.

[0012] Furthermore, the drive motor is equipped with a reverse dragging slow-moving function.

[0013] In a second aspect, a tractor is provided, comprising the power-split ECVT hybrid continuously variable transmission described in the first aspect, and further comprising a front axle assembly and a rear axle assembly connected to the transmission.

[0014] Compared with related technologies, the beneficial effects achieved by this invention are as follows: This invention replaces part of the mechanical transmission with an electric motor drive, thereby achieving continuously variable transmission; and by directly connecting the engine crankshaft and the generator rotor shaft, the PTO speed is no longer limited by the vehicle speed, thus decoupling the PTO speed from the vehicle speed and improving adaptability to multiple working conditions and operational efficiency. Attached Figure Description

[0015] Figure 1 The diagram shows the ECVT hybrid tractor power transmission architecture provided by this invention; Figure 2 The diagram illustrates the principle of the hybrid-driven hydraulic damper provided by this invention.

[0016] In the picture: 1. Engine; 2. Hydraulic shock absorber; 201. Drive wheel; 202. Transmission medium; 203. Driven wheel; 3. Diverter planetary gear set; 4. Gear shifting mechanism; 5. Drive motor; 6. Power battery; 7. Two-in-one controller; 8. Rear axle assembly; 9. Generator; 10. Overall controller; 11. Front axle assembly; 12. Clutch device. Detailed Implementation

[0017] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0018] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0019] In one specific embodiment, such as Figure 1 As shown, a power-split ECVT hybrid continuously variable transmission is provided, including an engine 1, a generator 9, a PTO transmission, a drive motor 5, a split planetary gear set 3, a shift mechanism 4, a clutch device 12, a power battery 6, a two-in-one controller 7, a whole machine controller 10, a front axle assembly 11, and a rear axle assembly 8.

[0020] Specifically, the crankshaft of engine 1 is directly connected to the rotor shaft of generator 9. The rotor shaft of generator 9 is a through shaft. This through shaft serves as the rotor shaft of generator 9 to generate electricity and also drives the PTO gearbox through a mechanical connection, thereby providing stable power output to external agricultural implements. Since the power of PTO comes from the through shaft of engine 1 and generator 9 and is independent of the vehicle's speed, the PTO speed is decoupled from the vehicle speed, and the PTO speed can be independently adjusted according to the needs of agricultural implements.

[0021] One end of the drive motor 5 is connected to the split planetary gear set 3. The drive motor 5 drives the vehicle through the split planetary gear set 3 and the shift mechanism 4. The split planetary gear set 3 can reasonably distribute the power from the drive motor 5 and transmit it to the drive axle of the vehicle through the shift mechanism 4. When needed, the shift mechanism 4 cooperates with the clutch device 12 to realize different power output modes and transmission switching.

[0022] In one specific embodiment, the drive motor 5 is preferably a reversible motor, which can drive the vehicle forward by rotating forward and reverse to achieve the reversing function under the control of the whole machine controller 10.

[0023] In addition, the drive motor 5 has a reverse drag slowing function. When the tractor is on a long downhill slope, the drive motor 5 can work in the power generation state, absorb some kinetic energy to form a braking effect, thereby achieving slow driving. The generated energy is stored in the power battery 6 to achieve energy recovery.

[0024] A hydraulic damper 2 is installed between the engine 1 and the planetary gear set 3 to buffer the impact torque output from the engine 1 to the transmission system. The hydraulic damper 2 includes a drive wheel 201, a driven wheel 203, and a liquid transmission medium 202 filled in the gap between them. During operation, when the drive wheel 201 and the driven wheel 203 move relative to each other, the medium is compressed, resulting in a buffering effect, thereby effectively absorbing torque impact, improving the reliability and service life of the transmission system, and improving the overall operating comfort.

[0025] Specifically, such as Figure 2 As shown, the cavity formed by the driven wheel 203 has the largest volume when it is in the middle position shown in the figure. When the driving wheel 201 and the driven wheel 203 move relative to each other, the volume of the cavity formed by them will decrease according to the set requirements. The liquid transmission medium 202 has the characteristic of controllable compressibility. When working, it is connected to the flywheel of the engine 1, and the driven wheel 203 is connected to the ECVT gearbox. The driving wheel 201 and the driven wheel 203 form a closed cavity, which is filled with liquid transmission medium 202. Due to the physical properties of the liquid transmission medium 202 and the structural characteristics of the hydraulic damper 2, the purpose of mitigating impact torque is achieved, thereby protecting the engine 1 and the ECVT gearbox.

[0026] The power battery 6 is electrically connected to the drive motor 5 and the generator 9, and is used to store the electrical energy output by the generator 9 and power the drive motor 5. Under high load conditions, the power battery 6 can provide additional electrical energy to the drive motor 5, improve the driving capability, and enable the tractor to have sufficient torque reserves to meet the needs of complex farmland operations.

[0027] The control unit includes a two-in-one controller 7 and a whole machine controller 10. The two-in-one controller 7 is connected to the drive motor 5 and the power battery 6 and is used to adjust the operating status of the drive motor 5. The whole machine controller 10 is electrically connected to the drive motor 5, the generator 9 and the power battery 6 and is used to comprehensively schedule the working status of the engine 1, the generator 9, the battery and the drive motor 5 according to the working conditions.

[0028] In one specific embodiment, a tractor is provided in which the drive motor 5 is connected to the rear axle assembly 8 and the front axle assembly 11 via the split planetary gear set 3, the shift mechanism 4 and the clutch device 12, thereby driving the vehicle to achieve four-wheel drive of the front and rear axles; the engine 1 drives the PTO gearbox through the through shaft of the generator 9 to provide working power for agricultural implements; the drive motor 5 achieves continuously variable transmission, reversing, slowing down and energy recovery through control.

[0029] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A power-split ECVT hybrid continuously variable transmission, characterized in that, include: Engine (1); A generator (9) is directly connected to the crankshaft of the engine (1), and the rotor shaft of the generator (9) is a through shaft; The PTO gearbox, wherein the through shaft of the generator (9) is connected to the PTO gearbox; The drive motor (5) is connected to a split planetary gear set (3) at one end, and the drive motor (5) drives the vehicle to travel through the split planetary gear set (3); The power battery (6) is electrically connected to the drive motor (5) and the generator (9); The engine (1) supplies power to the power battery (6) and drive motor (5) through the generator (9), and drives the PTO gearbox through the through shaft of the generator (9). A hydraulic damper (2) is provided between the engine (1) and the split planetary gear (3).

2. The power-split ECVT hybrid continuously variable transmission according to claim 1, characterized in that, The hydraulic damper (2) includes a drive wheel (201), a transmission medium (202) and a driven wheel (203); a gap is provided between the drive wheel (201) and the driven wheel (203), and the gap is filled with the transmission medium (202).

3. The power-split ECVT hybrid continuously variable transmission according to claim 1, characterized in that, One end of the split planetary gear set (3) is connected to a shift mechanism (4), which is connected to the vehicle's drive axle.

4. The power-split ECVT hybrid continuously variable transmission according to claim 3, characterized in that, The gearbox also includes a clutch device (12), which is disposed between the shift mechanism (4) and the drive axle.

5. The power-split ECVT hybrid continuously variable transmission according to claim 1, characterized in that, Also includes: Two-in-one controller (7) and whole machine controller (10); The two-in-one controller (7) is electrically connected to the drive motor (5) and the power battery (6); The overall controller (10) is electrically connected to the drive motor (5), the generator (9) and the power battery (6).

6. The power-split ECVT hybrid continuously variable transmission according to claim 1, characterized in that, The drive motor (5) is a reversible motor.

7. The power-split ECVT hybrid continuously variable transmission according to claim 1, characterized in that, The drive motor (5) is equipped with a reverse dragging function.

8. A tractor, characterized in that, The power-split ECVT hybrid continuously variable transmission as described in any one of claims 1 to 7 further includes a front axle assembly (11) and a rear axle assembly (8) connected to the transmission.

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