Power dividing-converging type high-horsepower tractor transmission device

Abstract

The invention discloses a power dividing-converging type high-horsepower tractor transmission device which comprises a front axle, a rear axle, a gear transfer case, an electromechanical compound transmission system and a power output transmission case. The electromechanical compound transmission system comprises an engine, a first motor, a second motor, a power distributor, a planetary reducer and a power integrated piece. The power integrated piece is connected with an input shaft of the gear transfer case through an external engagement gear. A rear output shaft of the gear transfer case is connected with the rear axle. A front output shaft of the gear transfer case is connected with the front axle. An output shaft of the engine is connected with the power output transmission case sequentially through an elastic coupler, the first motor, the power distributor and a clutch. According to the power dividing-converging type high-horsepower tractor transmission device, the power of the engine is divided at the input end and converged on a wheel driving shaft at the output end, stepless speed change and compound driving of two power flows can be achieved, and the power dividing-converging type high-horsepower tractor transmission device has the advantages of being simple in transmission structure, small in occupied space, high in transmission efficiency, low in emission amount, low in oil consumption and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of agricultural machinery, and in particular relates to a power splitting and converging tractor transmission device. Background technique [0002] At present, most of the transmission devices of agricultural tractors in China, especially high-horsepower tractors, use gear-type gearboxes. When using tractors to plow the fields, they need low driving speed and large output torque. When tractors are transported on the road, they need relatively high Driving speed and small output torque, in order to adapt to frequent changes in external load and stroke resistance, the gearbox needs to be able to change the speed and torque in a timely manner, which usually requires increasing the number of shift rows of the gearbox, which will inevitably make the structure of the gearbox complicated and It is bulky, and although the hydrostatic transmission method using a hydraulic pump and a motor can achieve stable stepless ...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the transmission devices of agricultural tractors in China, especially high-horsepower tractors, use gear-type gearboxes. When using tractors to plow the fields, they need low driving speed and large output torque. When tractors are transported on the road, they need relatively high Driving speed and small output torque, in order to adapt to frequent changes in external load and stroke resistance, the gearbox needs to be able to change the speed and torque in a timely manner, which usually requires increasing the number of shift rows of the gearbox, which will inevitably make the structure of the gearbox complicated and It is bulky, and although the hydrostatic transmission method using a hydraulic pump and a motor can achieve stable stepless transmission, it has problems such as low transmission efficiency and high component cost, but pure electric drive has disadvantages such as short battery life and inconvenient charging. For high-horsepower tractors, large-capacity batteries have problems such as large volume, heavy weight, and high cost; however, a drive system that uses an engine, generator, motor, and gearbox in series can be applied to high-horsepower tractors, but the engine emits The power of the generator is first converted into electric energy by the generator, and then converted into mechanical energy by the motor. There are two energy conversions in the entire transmission device, resulting in low transmission efficiency of the transmission device. At the same time, due to the direct connection between the engine and the generator, the generator speed is low and the motor is installed. The power is large, but there are also problems such as large volume and weight of the motor, difficult space layout of the vehicle, and high cost

[0003] Now some automobile manufacturers have begun to develop power-split gearboxes, which can simplify the structure of the gearbox and realize the continuously variable speed function. Toyota's Prius hybrid system (THS) is a power-split and confluence continuously variable transmission device. It has been successfully applied in the field of automobiles. The THS transmission device has multiple working modes according to the working conditions of the car, and the system control is complex. Its drive system mainly meets the needs of the car to control the speed in the forward direction. When the Prius car is reversing, the engine is turned off. Battery energy is used for pure electric reversing. This is mainly because when reversing, the electric motor (ring gear) of the Prius is reversed. If the engine is still working, that is, the planetary carrier is rotating in the forward direction. According to the differential principle of the planetary mechanism, the generator will (The sun gear) rotates faster in the forward direction, exceeding the allowable rated speed, which affects the service life of the gears and bearings. Therefore, the Prius adopts a pure electric mode for reversing, and the reversing speed is not easy to be too fast, so that the various components of the planetary mechanism can work at Within the limited speed range

[0004] However, tractors have variable working conditions, various functions, and harsh working environments. The driving speed and output traction of the tractor must be precisely controlled in the forward and reverse directions. The very large battery capacity makes the layout of the vehicle difficult, so the THS transmission of the Prius is not suitable for use on tractors; in addition, when the Prius is driving in urban areas, it will brake and accelerate frequently, and the braking energy can be recovered considerably. The starting and reversing working conditions are all driven by pure electric power, so the Prius car is equipped with a large-capacity battery, while the tractor often works in the field, the driving speed is low, and the braking energy recovery is limited. output traction, so modifications to existing transmissions are required

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