Stepless speed changing box of large-power tractor

Abstract

Disclosed is a stepless speed changing box of a large-power tractor. The stepless speed changing box of the large-power tractor comprises a speed changing box front box body, a middle box body, a rear box body, a first partition plate, a second partition plate, a third partition plate, a hydraulic mechanical double-flow transmission device, a fixed shaft speed changing transmission device, a forward transmission device, a backward transmission device, a four-wheel driving transmission device and a power output device. The speed changing box front box body, the middle box body and the rear box body are sequentially arranged. The speed changing box front box body and the middle box body are connected by using bolts through the first partition plate. The rear box body and the middle box body are connected through bolts. The middle box body and the rear box body are provided with the second partition plate and the third partition plate respectively through bolts. Six component installation cavities are formed inside the speed changing box bodies. The front end of the hydraulic mechanical double-flow transmission device stretches out of the front box body to be connected with an engine of the tractor. The rear end of the fixed shaft speed changing device stretches out of the rear box body to be connected with the input end of a rear axle. The rear end of the power output device stretches out of the rear box body to be connected with the input end of the power output shaft. The front end of the four-wheel driving transmission device stretches out of the rear box body to be connected with a front axle of the tractor.

Description

technical field [0001] The invention belongs to the field of tractors and relates to a tractor gearbox. In particular, it relates to a high-power tractor continuously variable transmission. Background technique [0002] At present, domestically produced high-power tractors generally adopt stepped shifting. The disadvantages are that there are many working gears, complex structure, discontinuous transmission ratio and low comfort. When the tractor is faced with different operating conditions, the engine cannot always be in the most ideal working condition, so that the energy saving and environmental protection of the tractor cannot be further realized. At present, foreign high-power tractors are mainly equipped with segmented power-split gearboxes. In order to realize the speed regulation, section change and direction change of the gearbox, there are mainly three structural forms: one is fixed-axis splitter device + integrated hydrostatic transmission device + hydraulic mec...

AI Technical Summary

Problems solved by technology

The first structural form, compact structure but high processing and assembly precision requirements

The second type of structure has a simple structure and a small number of parts, but requires high performance of hydraulic components

The third form requires low processing and assembly precision, but complex control

The above three schemes all use integrated hydraulic components and share the oil source with the gearbox lubrication system, which requires high cleanliness of the hydraulic system, and the reliability of the gearbox is not easy to guarantee

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