Gear ring input series-parallel hybrid power system for tractor

Abstract

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

Description

TECHNICAL FIELD

[0001] The utility model relates to hybrid power transmission system technical field especially is related to a gear ring input's series-parallel hybrid power system for tractor. BACKGROUND

[0002] The existing tractor transmission system is divided into manual gear shifting transmission system, uninterrupted power automatic gear shifting transmission system and hydraulic mechanical continuously variable transmission system (HMCVT) according to gear shifting mode.

[0003] Adopt manual gear shifting transmission system, and the tractor is frequently parked gear shifting when field work due to the great change of land resistance, and the great change of whole machine load, and the tractor with manual gear shifting transmission system needs to be frequently parked gear shifting to meet the traction and speed requirement of farm implement operation, and the working strength of staff is big, and the operation efficiency is low, and the operation quality is unstable, and simultaneously, the engine speed is directly related to vehicle speed, and the change of vehicle speed leads to the great change range of engine speed, and the engine cannot work in a stable and economic speed range, resulting in high oil consumption, poor emission and big vibration and wear.

[0004] Adopt hydraulic mechanical continuously variable transmission system (HMCVT), and the transmission system is composed of hydraulic plunger variable pump / motor / multi-row planetary mechanism / wet clutch and brake, and the main advantages are as follows: through the power split of planetary row, the power of engine (1) is split into two power lines, one is mechanical power line, and the power is directly transmitted to the input shaft of transmission box, and the other is hydraulic power line, and after the machine-fluid-machine power conversion process, the power is converged with the input shaft of transmission box; through the power split and convergence principle, the torque and speed of transmission system are automatically and continuously changed according to the requirements of vehicle speed and traction, and the traction and speed requirements of vehicle during speed change are guaranteed. The transmission system (HMCVT) realizes the stepless automatic change of vehicle transmission system, and the operation strength of staff is low, and the operation comfort is good, and the operation efficiency and quality are high; since the engine speed and torque are completely decoupled (irrelevant) with vehicle speed and traction, the engine can stably work in the low oil consumption area, and the vibration is small, and the emission is good.

[0005] The applicant has disclosed multiple prior applications including announcement number CN217994127U, CN217598331U, CN215435975U, CN215284352U, CN215284353U and the like. This patent belongs to the further optimization and improvement of the prior disclosed patent technology, improves the adaptability and enriches the functions of tractor.

[0006] The disclosure of the above background art content is only used to assist in understanding the concept and technical scheme of the utility model, which does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present patent application, the above background technology should not be used to evaluate the novelty and inventiveness of the present application. Utility Model Content

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

[0008] Therefore, this utility model proposes a series-parallel hybrid power system with gear ring input for tractors.

[0009] Preferably, the present invention may also have the following technical features:

[0010] A hybrid power system with gear ring 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 planet carrier, and a gear ring. One end of the central shaft is connected to the engine, and the other end is connected to the gear ring. The gear ring is connected to the planet carrier, which outputs power to the travel system. One end of the bushing is equipped with a sun gear connected to the planet carrier, and the other end is connected to the EM1 motor, which is used for generating electricity. The EM2 motor is coupled to the planet carrier.

[0011] Furthermore, the EM2 motor is a drive motor, or a motor that integrates drive and power generation functions.

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

[0013] 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.

[0014] Furthermore, the force transmission shaft passes through the gearbox.

[0015] Furthermore, it also includes a hydraulic output system, which is poweredly connected to the central shaft.

[0016] Furthermore, the hydraulic output system includes a hydraulic pump and a high-flow variable pump, which are drivenly connected to the same gear.

[0017] Furthermore, it also includes a torsional damper, through which the engine is connected to the central shaft.

[0018] Furthermore, it also includes a parallel shaft shift gear train, which includes a first gear shift gear set, a second gear shift gear set, and a shift mechanism; the EM2 motor is connected to the first gear shift gear set and the second gear shift gear set, and the shift mechanism is used to transmit the power of the first gear shift gear set and the second gear shift gear set to the planetary carrier.

[0019] 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 planet carrier of the planetary gear set are connected in a transmission manner. 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.

[0020] The advantages of this invention compared to existing technologies include: the power of the EM2 motor is coupled to the planetary carrier, 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 power generated by the EM1 motor is used by the EM2 motor, and the EM2 motor consumes exactly the same amount of power as the EM1 motor outputs, achieving power balance. The power generated by the EM1 motor does not place an additional burden on the battery. Attached Figure Description

[0021] Figure 1 This is a diagram of the transmission structure of this utility model.

[0022] Figure 2 yes Figure 1 Based on this, another embodiment of the transmission structure diagram is shown.

[0023] Figure 3 yes Figure 1 Based on this, another embodiment of the transmission structure diagram is shown.

[0024] Figure 4 yes Figure 3 Another modified embodiment of the transmission structure diagram.

[0025] Explanation of reference numerals in the attached figures

[0026] 1. Engine; 2. Torsional damper; 3. EM1 motor; 4. Central shaft; 5. Gear transmission mechanism; 6. Bushing; 7. Planetary gears; 8. Gear ring; 9. Sun gear; 10. Travel system; 11. Force transmission shaft; 12. Planetary carrier; 13. Hydraulic pump; 14. High-flow variable pump; 15. EM2 motor. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] like Figure 1The illustrated hybrid power system for a tractor with gear input includes an engine 1, a central shaft 4, a bushing 6, a planetary gear set, an EM1 motor 3, and an EM2 motor 15. The planetary gear set includes a sun gear 9, planet gears 7, a planet carrier 12, and a gear ring 8. One end of the central shaft 4 is connected to the engine 1, and the other end is connected to the gear ring 8. The gear ring 8 is connected to the planet gears 7 on the planet carrier 12, which outputs power to a travel system 10 to drive the vehicle. One end of the bushing 6 is fitted with a sun gear 9 connected to the planet gears 7 on the planet carrier 12, and 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 15. The EM2 motor 15 is coupled to the planet carrier 12 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 15, and the EM2 motor 15 outputs power, which is then fed back to the planet carrier 12. In this embodiment, the power of the EM2 motor 15 is coupled to the planetary carrier 12, and the walking system 10 can be driven by both the power of the engine 1 and the power of the EM2 motor 15 at the same time, resulting in strong performance and stable power output.

[0030] It also includes a force transmission shaft 11, one end of which is connected to the gear ring 8, and the other end is connected to the PTO. Preferably, the force transmission shaft 11 passes through the gearbox. In this embodiment, the other end of the force transmission shaft 11 may not be connected to the PTO, allowing the force transmission shaft 11 to idle.

[0031] In one example, engine 1 inputs power to the planetary gear set. The power from engine 1 branches into two transmission paths on the ring gear 8 of the planetary gear set. One path splits the power to the transmission shaft 11, while the other path transmits the power along the ring gear 8 to the planetary gears 7. At the planetary gears 7, power is split: a portion of the engine power is output to the drive system 10 via the planet carrier 12, and the other portion drives the EM1 motor 3 via the sun gear 9 to rotate, adjusting the engine torque and generating electricity. The power generated by EM1 motor 3 is used by EM2 motor 15, and the power output of EM1 motor 3 is exactly the same as the power consumed by EM2 motor 15. This achieves power balance, and the power 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's charge is consumed by EM2 motor 15.

[0032] Alternatively, in other implementations of the connection of the force transmission shaft 11, 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 11 to mesh with the first gear, so that the power of the engine 1 is directly transmitted to the force transmission shaft 4, and the other end of the force transmission shaft is connected to the PTO. The power of the PTO system is directly output by the engine at a constant speed.

[0033] Common hydraulic output systems are typically mounted on the rear axle, but this method has low compatibility. In this embodiment, a gear transmission mechanism 5 connects the hydraulic output system to the central shaft 4, from which the central shaft 4 outputs power to the hydraulic output system. The hydraulic output system includes a hydraulic pump 13 and a high-flow-rate variable pump 14. The hydraulic pump 13 and the high-flow-rate variable pump 14 are driven by the same gear 51. This embodiment, by connecting the hydraulic output system to the central shaft 4, offers better compatibility than the scheme where the hydraulic output system is mounted on the rear axle.

[0034] 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.

[0035] 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 15 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 planetary carrier 12. The EM2 motor shaft is connected to the input end of the parallel shaft shift gear train. When the shift mechanism 20 and the first gear set 18 are engaged, the power output by the EM2 motor 15 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 planetary carrier 12. When the shift mechanism 20 and the second gear set 19 are engaged, the power output by the EM2 motor 15 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 planetary carrier 12.

[0036] 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 drive-connected to the planetary gear set 22 (which may 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 planet carrier 12. 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 drive-connected to the planet carrier 12 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.

[0037] 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.

[0038] 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 power system with gear ring input for a tractor, comprising an engine, a central shaft, bushings, a planetary gear set, an EM1 motor, and an EM2 motor, wherein the planetary gear set comprises a sun gear, planet gears, a planet carrier, and a gear ring, characterized in that: One end of the central shaft is connected to the engine, and the other end is connected to the gear ring; The gear ring is connected to the planetary carrier, which outputs power to the walking system; one end of the bushing is equipped with a sun gear connected to the planetary carrier, and the other end is connected to the EM1 motor, which is used to generate electricity; the EM2 motor is coupled to the planetary carrier.

2. The hybrid power system as described in claim 1, characterized in that: The EM2 motor is a drive motor, or a motor that integrates drive and power generation functions.

3. The series-parallel hybrid power system as described in claim 1, characterized in that: It also includes a force transmission shaft, one end of which is connected to a gear ring and the other end to a PTO.

4. The series-parallel hybrid power system as described in claim 1, characterized in that: 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.

5. The series-parallel hybrid power system as described in claim 3 or 4, characterized in that: The power transmission shaft passes through the gearbox.

6. The series-parallel hybrid power system as described in claim 1, characterized in that: It also includes a hydraulic output system, which is poweredly connected to the central shaft.

7. The series-parallel hybrid power system as described in claim 6, characterized in that: The hydraulic output system includes a hydraulic pump and a high-flow variable pump, which are drivenly connected to the same gear.

8. The series-parallel hybrid power system as described in claim 1, characterized in that: It also includes a torsional damper, through which the engine is connected to the central shaft.

9. The series-parallel hybrid power system as described in claim 1, characterized in that: It also includes a parallel shaft shift gear train, which includes a first gear shift gear set, a second gear shift gear set, and a shift mechanism; the EM2 motor is connected to the first gear shift gear set and the second gear shift gear set, and the shift mechanism is used to transmit the power of the first gear shift gear set and the second gear shift gear set to the planetary carrier.

10. The series-parallel hybrid power system as described in claim 1, characterized in that: 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 planet carrier of the planetary gear set are connected in a transmission. 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.

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