Planet carrier input series-parallel hybrid power system for tractor

Abstract

The utility model discloses a planet carrier input series-parallel hybrid power system for a tractor, which comprises an engine, a central shaft, a shaft sleeve, a planet row, an EM1 motor and an EM2 motor, the planet row comprises a sun gear, a planet gear, a planet carrier and a gear ring, one end of the central shaft is connected with the engine, and the other end of the central shaft is connected with the planet carrier; a planet wheel of the planet carrier is connected with the gear ring, and the gear ring outputs power to a walking system; one end of the shaft sleeve is provided with the sun gear and connected with the planet gear, and the other end of the shaft sleeve is connected with the EM1 motor which is used for generating electricity; and the EM2 motor is coupled to the gear ring. The utility model has the advantages of compact structure, strong functionality, stable power output and the like.

Description

Technical Field

[0001] This utility model relates to the field of hybrid power transmission technology, and in particular to a series-parallel hybrid power system with planetary carrier input for tractors. Background Technology

[0002] Existing tractor transmission systems are classified according to their shifting methods into manual shift transmission systems, power-uninterrupted automatic shift transmission systems, and hydraulic-mechanical continuously variable transmission systems (HMCVT).

[0003] When using a manual transmission system, tractors operating in the field experience significant variations in soil resistance and overall machine load. This necessitates frequent stops and gear shifts to meet the traction and speed requirements of implement operations, resulting in high workload for workers, low work efficiency, and inconsistent work quality. Furthermore, since engine speed is directly related to vehicle speed, variations in vehicle speed lead to a wide range of engine speed fluctuations. Consequently, the engine cannot operate within a stable and economical speed range, resulting in high fuel consumption, poor emissions, and significant vibration and wear.

[0004] The hydraulic mechanical continuously variable transmission (HMCVT) is adopted. This transmission system consists of a hydraulic piston variable pump / motor / multi-row planetary mechanism / wet clutch and brake. Its main advantages are: the power of the engine (1) is split into two power routes through the planetary gear set. One is the mechanical power route, which is directly transmitted to the input shaft of the gearbox; the other is the hydraulic power route, which is converted from mechanical to hydraulic to mechanical power and then merged with the input shaft of the gearbox. Through the principle of power splitting and merging, the torque and speed of the transmission system can be automatically and continuously changed according to the vehicle speed and traction requirements, so as to ensure the traction and speed requirements when the vehicle changes speed. The transmission system (HMCVT) realizes the stepless automatic change of the vehicle transmission system, with low operating intensity, good operating comfort, and high work efficiency and quality. Since the engine speed and torque are completely decoupled (unrelated) from the vehicle speed and traction, the engine can work stably in the low fuel consumption range, with low vibration and good emissions.

[0005] The applicant has previously published several applications, including those with publication numbers CN217994127U, CN217598331U, CN215435975U, CN215284352U, and CN215284353U. This patent represents a further optimization and improvement of the previously published patent technology, enhancing adaptability and enriching the functions of the tractor.

[0006] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0007] The main purpose of this utility model is to propose a planetary carrier input hybrid power system for tractors that is compact in structure, highly functional, and has stable power output.

[0008] Therefore, this utility model proposes a hybrid power system with planetary carrier input for tractors. Preferably, this utility model may also have the following technical features:

[0009] A hybrid power system with planetary carrier input for a tractor includes an engine, a central shaft, a bushing, a planetary gear set, an EM1 motor, and an EM2 motor. The planetary gear set includes a sun gear, planet gears, a planetary carrier, and a ring gear. One end of the central shaft is connected to the engine, and the other end is connected to the planetary carrier. The planet gears of the planetary carrier are connected to the ring gear, which outputs power to the travel system. One end of the bushing is fitted with the sun gear and connected to the planet gears, while the other end is connected to the EM1 motor, which generates electricity. The EM2 motor is coupled to the ring gear.

[0010] Furthermore, the EM2 motor is a drive motor, or a motor that integrates drive and power generation functions.

[0011] Furthermore, it also includes a force transmission shaft, one end of which is connected to the planetary carrier drive, and the other end is connected to the PTO.

[0012] Furthermore, it also includes a force transmission shaft, one end of which is connected to the central shaft via a gear, and the other end is connected to the PTO.

[0013] Furthermore, the power transmission shaft passes through the gearbox.

[0014] Furthermore, it also includes a hydraulic output system, which is connected to the central shaft drive.

[0015] Furthermore, the hydraulic output system includes a hydraulic pump and a high-flow variable pump, which are drivenly connected to the same gear.

[0016] Furthermore, it also includes a torsional damper, through which the engine is connected to the central shaft.

[0017] Furthermore, it also includes a parallel shaft shift gear system, which includes a first-speed gear set, a second-speed gear set, and a shifting mechanism; the EM2 motor is connected to the first-speed gear set and the second-speed gear set, and the shifting mechanism is used to transmit the power of the first-speed gear set and the second-speed gear set to the gear ring.

[0018] Furthermore, it also includes a rear planetary gear set, a housing, and a shift fork; the rear planetary gear set includes a rear sun gear, rear planet gears, a rear planet carrier, and a rear ring gear. The rear sun gear and the ring gear of the planetary gear set are connected in a driving connection. The rear planetary gear set and the shift fork are mounted on the housing. The rear ring gear and the rear planet carrier are locked and fixed by shifting the position of the shift fork, or the rear ring gear and the housing are locked and fixed.

[0019] The beneficial effects of this invention compared to existing technologies include: during operation, the EM1 motor generates electricity to supply power to the EM2 motor, and the EM2 motor outputs power, which is then channeled to the gear ring. In this embodiment, the power of the EM2 motor is coupled to the gear ring, allowing the walking system to be driven simultaneously by both engine power and EM2 motor power, resulting in strong performance and stable power output. The EM1 motor charges the battery, and the battery's charge is consumed by the EM2 motor, without placing an additional burden on the battery. Attached Figure Description

[0020] Figure 1 This is a diagram of the transmission structure of this utility model.

[0021] Figure 2 yes Figure 1 Based on this, another embodiment of the transmission structure diagram is shown.

[0022] Figure 3 yes Figure 1 Based on this, another embodiment of the transmission structure diagram is shown.

[0023] Figure 4 yes Figure 3 Another modified embodiment of the transmission structure diagram.

[0024] Explanation of reference numerals in the attached figures

[0025] 1. Engine; 2. Torsional damper; 3. EM1 motor; 4. Central shaft; 5. Gear transmission mechanism; 6. Sun gear; 7. Planetary gears; 8. Gear ring; 9. Walking system; 10. Force transmission shaft; 11. Planetary carrier; 12. Hydraulic pump; 13. High-flow variable pump; 14. EM2 motor; 15. Bushing. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0027] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0028] like Figure 1The diagram illustrates a planetary carrier-based hybrid power system for a tractor, comprising an engine 1, a central shaft 4, a bushing 15, a planetary gear set, an EM1 motor 3, and an EM2 motor 14. The planetary gear set includes a sun gear 6, planet gears 7, a planetary carrier 11, and a ring gear 8. One end of the central shaft 4 is connected to the engine 1, and the other end is connected to the planetary carrier 11. The planet gears 7 of the planetary carrier 11 are connected to the ring gear 8, which outputs power to a travel system 9 to drive the vehicle. One end of the bushing 15 is fitted with the sun gear 6, which is connected to the planet gears 7. The other end drives the EM1 motor 3 via gear transmission. The EM1 motor 3 generates electricity, which can be used to drive the EM2 motor 14. The EM2 motor 14 is coupled to the ring gear 8 and serves as a drive motor or a motor integrating drive and power generation functions. During operation, the EM1 motor 3 generates electricity to supply power to the EM2 motor 14, and the EM2 motor 14 outputs power, which is then fed into the ring gear 8. In this embodiment, the power of the EM2 motor 14 is coupled to the gear ring 8, and the walking system 9 can be driven by both the engine power and the EM2 motor power at the same time, resulting in strong performance and stable power output.

[0029] It also includes a force transmission shaft 10, one end of which is connected to the planetary carrier 11 for transmission, and the other end is connected to the PTO. Preferably, the force transmission shaft passes through the gearbox. In this embodiment, the other end of the force transmission shaft 10 may not be connected to the PTO, allowing the force transmission shaft 10 to idle.

[0030] In one example, engine 1 inputs power into the planetary gear set. The engine power branches into two transmission paths on the planet carrier 11: one path leads to the transmission shaft 10, and the other path transmits power along the planet carrier 11 to the planet gears 7. At the planet gears 7, power is split: a portion of the engine power is output via the ring gear 8 and transmitted to the drive system 9; the other portion drives the EM1 motor 3 via the sun gear 6, adjusting the torque of engine 1 and generating electricity. The power generated by EM1 motor 3 is used by EM2 motor 14, and EM2 motor 14 consumes exactly the same amount of power as EM1 motor 3. This achieves power balance, and the electricity generated by EM1 motor 3 does not place an additional burden on the battery. In other words, EM1 motor 3 charges the battery, and the battery receives all the electricity from EM1 motor 3, which is then consumed by EM2 motor 14.

[0031] Alternatively, in other implementations of the connection of the force transmission shaft 10, a first gear is provided at the end of the central shaft 4, and a second gear is provided at the end of the force transmission shaft 10 to mesh with the first gear, so that the power of the engine 1 is directly transmitted to the force transmission shaft 10, and the other end of the force transmission shaft 10 is connected to the PTO. The power of the PTO system is directly output by the engine at a constant speed.

[0032] Common hydraulic output systems are typically mounted on the rear axle, but this results in low adaptability. This embodiment utilizes a gear mechanism to connect the hydraulic output system to the central shaft 4, allowing the central shaft to output power to the hydraulic output system. The hydraulic output system includes a hydraulic pump 12 and a high-flow-rate variable pump 13. The hydraulic pump 12 and the high-flow-rate variable pump 13 are driven by the same gear. This embodiment, by connecting the hydraulic output system to the central shaft 4, offers better adaptability than the scheme where the hydraulic output system is mounted on the rear axle.

[0033] It also includes a torsional damper 2, through which the engine 1 is connected to the central shaft 4. The torsional damper 2 serves as overload protection. When the torsional damper 2 is activated, the engine 1 and the central shaft 4 are disconnected.

[0034] Combination Figure 2 The illustrated embodiment also includes a parallel shaft shift gear train, which includes a first gear set 18, a second gear set 19, and a shift mechanism 20; the EM2 motor 14 is connected to the first gear set 18 and the second gear set 19, and the shift mechanism 20 is used to transmit power from the first gear set 18 and the second gear set 19 to the gear ring 8. The EM2 motor shaft is connected to the input end of the parallel shaft shift gear system. When the shift mechanism 20 is engaged with the first gear set 18, the power output by the EM2 motor 14 is transmitted from the motor shaft 16 to the first gear set 18, then through the shift mechanism 20 to the output shaft 17, and finally through the gear assembly 21 to the gear ring 8. When the shift mechanism 20 is engaged with the second gear set 19, the power output by the EM2 motor 14 is transmitted from the motor shaft 16 to the second gear set 19, then through the shift mechanism 20 to the output shaft 17, and finally through the gear assembly 21 to the gear ring 8.

[0035] Combination Figure 3 and 4 Another embodiment shown also includes a rear planetary gear set 23, a housing 25, and a shift fork 24. The rear planetary gear set 23 is drivenly connected to the planetary gear set 22 (which can also be called a front planetary gear set), and the planetary gear set 22 transmits power to the rear planetary gear set 23 via a ring gear 8. The rear planetary gear set 23 includes a rear sun gear 231, rear planet gears 232, a rear planet carrier 234, and a rear ring gear 233. The rear sun gear 231 is drivenly connected to the ring gear 8 of the planetary gear set 22. The rear planetary gear set 23 and the shift fork 24 are mounted on the housing 25. By shifting the position of the shift fork 24, the rear ring gear 233 and the rear planet carrier 234 can be locked and fixed, or the rear ring gear 233 and the housing 25 can be locked and fixed. The rear planetary gear set 23, the housing 25, and the shift fork 24 adopt an existing structural arrangement to further adjust the speed ratio.

[0036] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0037] Although exemplary embodiments of the present invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the present invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the present invention.

Claims

1. A hybrid powertrain system for a tractor with planetary carrier input, comprising an engine, a central shaft, a shaft sleeve, a planetary gear set, an EM1 motor and an EM2 motor, the planetary gear set comprising a sun gear, a planet gear, a planetary carrier and a ring gear, characterized in that: One end of the center shaft is connected to the engine, and the other end is connected to the planet carrier; the planet gears of the planet carrier are connected to the ring gear, and the ring gear outputs power to the running system; one end of the shaft sleeve is installed on the sun gear connected to the planet gears, and the other end is connected to the EM1 motor, which is used for power generation; the EM2 motor is coupled on the ring gear.

2. The parallel-series hybrid system according to claim 1, characterized by: The EM2 motor is a driving motor, or a motor integrated with driving and power generation functions.

3. The parallel-series hybrid system according to claim 1, characterized by: It also includes a power transmission shaft, one end of which is drivingly connected to the planet carrier, and the other end is connected to the PTO.

4. The parallel-series hybrid system according to claim 1, characterized by: It also includes a power transmission shaft, one end of which is connected to the center shaft through a gear, and the other end is connected to the PTO.

5. The parallel-series hybrid system according to claim 3 or 4, characterized by: The power transmission shaft passes through the gearbox.

6. The parallel-series hybrid system according to claim 1, characterized by: It also includes a hydraulic output system, which is drivingly connected to the center shaft.

7. The parallel-series hybrid system according to claim 6, characterized by: The hydraulic output system includes a hydraulic pump and a large-flow variable pump, which are drivingly connected to the same gear.

8. The parallel-series hybrid system according to claim 1, characterized by: It also includes a torsional damper, through which the engine is connected to the center shaft.

9. The parallel-series hybrid system according to claim 1, characterized by: It also includes a parallel shaft gear shifting system, which includes a one-gear variable gear set, a two-gear variable gear set, and a gear shifting mechanism; the EM2 motor is drivingly connected to the one-gear variable gear set and the two-gear variable gear set, and the gear shifting mechanism is used to transmit power from the one-gear variable gear set and the two-gear variable gear set to the ring gear.

10. The parallel-series hybrid system according to claim 1, characterized by: It also includes a rear planetary row, a housing, and a shift fork; the rear planetary row includes a rear sun gear, rear planet gears, a rear planet carrier, and a rear ring gear, the rear sun gear is drivingly connected to the ring gear of the planet row, the rear planetary row and the shift fork are installed on the housing, and the rear ring gear and the rear planet carrier are locked and fixed by shifting the position of the shift fork, or the rear ring gear and the housing are locked and fixed.

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