Hybrid continuously variable transmission (CVT) driving assembly and tractor

Abstract

The utility model discloses a hybrid CVT (continuously variable transmission) driving assembly and a tractor. The hybrid CVT driving assembly comprises an engine, a power battery, a complete machine controller, a rear axle assembly, a power output, a PTO (power take-off) output, a PTO gearbox, a gearbox, a driving motor, a driving motor output shaft, an engine PTO input shaft, a generator and a universal transmission shaft, the engine is designed through a hybrid driving framework and used for power generation and PTO output, decoupling of the rotating speed of the engine and the vehicle speed is achieved, and the operation efficiency and the fuel economy are remarkably improved; the reversing working condition of the tractor is realized through reverse control of the motor; auxiliary power supply and energy recovery are achieved through the battery, and the tractor has sufficient torque reserve to meet the requirements of complex working conditions by means of the short-time overload capacity of the motor. The tractor is good in starting performance and acceleration performance; the motor runs stably at low speed, and ultra-low-speed crawling of the tractor is achieved; and decoupling of the PTO rotating speed and the running speed can meet the requirements of multi-working-condition complex operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of tractor transmission, and particularly relates to a hybrid continuously variable transmission (CVT) drive assembly and a tractor. Background Technique

[0002] CVT: Abbreviation of Continuously Variable Transmission, referring to a continuously variable transmission.

[0003] Hybrid power: It refers to a technology in which a vehicle power system adopts two different power sources, generally divided into fuel-electric hybrid and plug-in hybrid, mainly applied in the commercial vehicle field, and is currently becoming more and more common in the construction machinery industry.

[0004] PTO: Abbreviation of power take off, referring to power output in the tractor field, generally used to provide power for implements carried by the tractor, etc.

[0005] At present, hybrid technology and new energy technology are more and more widely applied and tend to be mature in the commercial vehicle field. The research on hybrid power in agricultural machinery, especially in the tractor industry, is in the conceptual design stage and has not reached the commercial level. However, the application of hybrid technology in tractors is mainly to solve the problem of continuously variable transmission efficiency and achieve maximum fuel economy. Its application has indeed solved the efficiency problem of traditional HMCVT, reduced fuel consumption. In the field of large-horsepower tractors, the reliability problems of core transmission components such as power shift transmissions and CVTs still restrict the popularization and application of industry products. The realization of electric continuously variable transmission through the application of hybrid technology will surely improve the reliability of power shift transmissions, and then drive the application of large-horsepower tractors.

[0006] The prior art CN 214728147U discloses an electric drive type tractor CVT power assembly with an electric drive through-hole PTO structure, but its technical PTO speed is strongly correlated with the speed of the motor 103 and decoupling is not achieved. When the tractor drives implements that require PTO, such as balers, rotary tillers, etc., due to the need for the PTO speed to match the vehicle speed, it will affect the operation effect and operation efficiency, and even cannot meet the working conditions requirements. Content of the Utility Model

[0007] Purpose of the utility model: The purpose of the utility model is to provide a hybrid continuously variable transmission (CVT) drive assembly and a tractor. In the field of large-horsepower tractors, the reliability problems of core transmission components such as power shift transmissions and CVTs still restrict the popularization and application of industry products. The realization of electric continuously variable transmission through the application of hybrid technology will surely improve the reliability of power shift transmissions, and then drive the application of large-horsepower tractors; through the application of hybrid continuously variable transmission, the operation comfort of the tractor is improved, and at the same time, a reliable platform for unmanned operation of the tractor is provided.

[0008] Technical solution: A hybrid continuously variable transmission (CVT) drive assembly of the present utility model includes an engine, a power battery, an overall machine controller, a rear axle assembly, a power output, a PTO output, a PTO transmission, a transmission, a drive motor, a drive motor output shaft, an engine PTO input shaft, a generator, and a universal drive shaft;

[0009] The engine is connected to the generator; the overall machine controller is connected to the power battery and the power output.

[0010] The armature shaft of the generator is a through-type shaft, which directly drives the PTO transmission through the drive motor output shaft of the drive motor, and then outputs power to the PTO output;

[0011] The drive motor is connected to the transmission to drive the rear axle assembly;

[0012] The transmission is provided with two power output ports, one end is connected to the rear axle assembly, and the other end is connected to the universal drive shaft;

[0013] The engine PTO input shaft is connected to the PTO transmission.

[0014] Further, the drive motor output shaft is a hollow structure, and the engine PTO input shaft passes through the middle of the drive motor output shaft.

[0015] Further, the crankshaft of the engine is connected to the rotor shaft of the generator, and the rotor shaft of the generator is a through shaft.

[0016] Further, the drive motor has a function of reverse dragging and slow running, and generates electricity under long downhill conditions and stores the generated electricity in the power battery through the overall machine controller.

[0017] Further, the rotor shaft of the generator is a through shaft, the main drive motor shaft is a hollow shaft, and the rotor shaft of the generator is connected to the PTO input shaft through a universal drive shaft.

[0018] Further, the overall machine is designed with a frame, and the engine and generator assembly are connected to the frame through suspension parts.

[0019] The present utility model also discloses a tractor, and the tractor is provided with a hybrid continuously variable transmission (CVT) drive assembly.

[0020] Beneficial effects: Compared with the prior art, the utility model has the following remarkable advantages: The hybrid CVT tractor and drive assembly provided by the utility model utilize the characteristics of the motor with high torque at low speed and wide speed range, and use the motor for driving. During the process, stepless speed change is realized through motor speed regulation in the tractor driving process; through the design of the hybrid drive architecture, the engine is used for power generation and PTO output, realizing the decoupling of the engine speed and vehicle speed, and significantly improving the operation efficiency and fuel economy; through the reverse control of the motor, the reverse operation condition of the tractor is realized, and the operation is simple; through the power battery, auxiliary power supply and energy recovery are realized, and by utilizing the short-term overload capacity of the motor, the tractor has sufficient torque reserve to meet the requirements of complex working conditions; the starting performance of the tractor is good, the starting is fast, and the acceleration performance is good; the motor runs stably at low speed, realizing the ultra-low speed crawling of the tractor; the decoupling of the PTO speed and the driving speed of the tractor can meet the requirements of complex operations in multiple working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the utility model Figure 1 ;

[0022] Figure 2 is a structural schematic diagram of the utility model Figure 2 ;

[0023] Among them, 1 is the engine, 2 is the whole machine controller, 3 is the power battery, 4 is the rear axle assembly, 5 is the power output, 6 is the PTO output, 7 is the PTO transmission, 8 is the transmission, 9 is the drive motor, 10 is the drive motor output shaft, 11 is the engine PTO drive shaft, 12 is the generator, and 13 is the universal drive shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solution of the utility model will be further described below with reference to the drawings.

[0025] The hybrid CVT tractor and drive assembly provided by the utility model, as Figure 1 shown, includes: 1 engine, 2 whole machine controller, 3 power battery, 4 rear axle assembly, 5 power output, 6 PTO output, 7 PTO transmission, 8 transmission, 9 drive motor, 10 drive motor output shaft, 11 engine PTO drive shaft, 12 generator, 13 universal drive shaft.

[0026] The crankshaft of engine 1 is drivingly connected to generator 12 for power generation to supply power to power battery 3, and at the same time, power is provided to drive motor 9 through the whole machine controller 2 in real time; the armature shaft of generator 12 is a through-type shaft, which directly drives PTO transmission 7 through the hollow structure of the drive motor output shaft 10 of drive motor 9, and then outputs power to PTO output shaft 6; drive motor 9 is directly connected to transmission 8 to drive rear axle assembly 4; the whole machine controller 2 is provided with a power output port 5 at the rear of the tractor to supply power to the implements or other drive units carried by the tractor; transmission 8 is provided with two power output ports, one end is connected to rear axle assembly 4, and the other end is connected to universal drive shaft 13, thereby realizing four-wheel drive of the tractor; in the long downhill working condition, drive motor 9 has a function of reverse towing and slow running, and can generate electricity and store the generated electricity in power battery 3 through the whole machine controller 2 to realize energy recovery; engine 1 generates electricity by directly connecting the crankshaft to generator 12, and at the same time, an engine PTO drive shaft 11 is provided and connected to PTO transmission 7 to realize mechanical power output; the drive motor output shaft 10 of drive motor 9 is a hollow structure, and the engine PTO drive shaft can pass through it; this configuration realizes the decoupling of PTO output and vehicle driving speed to meet the requirements of multi-condition operations.

[0027] The hybrid CVT tractor is equipped with an engine and a generator. The crankshaft of the engine is directly connected to the rotor shaft of the generator, and the rotor shaft of the generator is a through shaft; an electric motor is arranged to drive the transmission and the rear axle. The motor shaft is a hollow structure, and the engine output shaft can pass through it to drive the PTO transmission, and then drive the whole machine PTO; a whole machine controller and a power battery are arranged for the control and energy storage of the drive circuit of the tractor; a power output is arranged to provide a power source for the extended application of the tractor; a universal drive shaft and a rear axle assembly are arranged for the final drive of the vehicle, and the power output of the front axle is provided by the transmission output shaft. Auxiliary power supply and energy recovery are realized through the power battery. By using the short-term overload capacity of the motor, the tractor has sufficient torque reserve to meet the requirements of complex working conditions; the tractor has good starting performance, fast starting and good acceleration performance; the motor runs stably at low speed, realizing ultra-low speed crawling of the tractor; the decoupling of the PTO speed and the driving speed of the tractor can meet the requirements of multi-condition complex operations.

Claims

1. A hybrid continuously variable transmission CVT drive assembly, characterized in that: It includes an engine (1), a whole machine controller (2), a power battery (3), a rear axle assembly (4), a power output (5), a PTO output (6), a PTO gearbox (7), a gearbox (8), a drive motor (9), a drive motor output shaft (10), an engine PTO input shaft (11), a generator (12) and a universal drive shaft (13); The engine (1) is connected to a generator (12); the whole machine controller (2) is connected to a power battery (3) and a power output (5); The armature shaft of the generator (12) is of a through-type, and directly drives the PTO gearbox (7) through the drive motor output shaft (10) of the drive motor (9), thereby outputting power to the PTO output (6); The driving motor (9) is connected to the gearbox (8) to drive the rear axle assembly (4); The gearbox (8) is provided with two power output ports, one end of which is connected to the rear axle assembly (4) and the other end of which is connected to the universal transmission shaft (13); The engine PTO input shaft (11) is connected to the PTO gearbox (7).

2. A hybrid continuously variable transmission CVT drive assembly according to claim 1, characterized in that: The drive motor output shaft (10) is a hollow structure, and the engine PTO input shaft (11) passes through the middle of the drive motor output shaft (10).

3. A hybrid continuously variable transmission CVT drive assembly according to claim 1, characterized in that: The crankshaft of the engine (1) is connected to the rotor shaft of the generator (12), and the rotor shaft of the generator (12) is a through shaft.

4. A hybrid continuously variable transmission CVT drive assembly according to claim 1, characterized in that: The drive motor (9) has an anti-drag slowing function, generates electricity in a long downhill condition and stores the generated electricity in a power battery (3) through a whole machine controller (2).

5. The hybrid continuously variable transmission CVT drive assembly according to claim 1, characterized in that: The rotor shaft of the generator (12) is a through shaft, the shaft of the drive motor (9) is a hollow shaft, and the rotor shaft of the generator (12) is connected to the PTO input shaft (11) through a universal transmission shaft (13).

6. A tractor, characterized in that: The tractor is provided with the hybrid continuously variable transmission CVT drive assembly according to claim 1.

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