Three-planet row four-section hydraulic mechanical stepless transmission

Abstract

The invention discloses a three-planet row four-section hydraulic mechanical stepless transmission. According to the three-planet row four-section hydraulic mechanical stepless transmission, an integrated structure with a pump and a motor are adopted, the power of an engine is divided into a hydraulic path power input and a mechanical path power input through a hydraulic transmission system and amechanical transmission system, then convergence output of the two-strand power is carried out through three planetary rows of P1, P2 and P3, and finally, three power is output outwards by a third rowof gear rings, a duplex sun gear and a first planet carriers. The gearbox controls four gears to change speed by controlling the combination of the four clutches k1, k2, k3 and k4. According to the stepless transmission, four clutches K1, K2, K3 and K4 are controlled to combine to realize gear shifting, the first row of planet carriers, the second row of gear rings, a third row of planet carriersand a fifth fixed gear pair i5 are of an all-in-one rigid structure, so that synchronous rotation of the four components is ensured when the four components are operated, and high-efficiency and continuous stepless transmission of different sections is realized by switching the output modes of different components of the three planetary gear trains.

Description

technical field [0001] The invention belongs to the technical field of tractor gearbox transmission, and in particular relates to a three-planetary four-stage hydraulic-mechanical stepless gearbox. Background technique [0002] At present, the most widely used is the belt drive type that transmits power by the friction of the flexible belt or chain and the pulley. From the early rubber belt to the current metal chain or metal belt type, due to the metal belt type stepless speed change The box mainly relies on the friction torque generated by the friction between the metal block and the pulley to realize the power transmission. The size of the transmitted power is limited by the friction coefficient between the metal block and the pulley and the pressure on the working surface. The power transmitted by a single channel is not large enough, and Efficiency and service life all need to be improved, and cannot meet the requirements of high-power vehicles. The electric transmissi...

AI Technical Summary

Problems solved by technology

Its disadvantages are complex structure, high cost, low transmission efficiency and narrow range of high efficiency.

[0004] Due to the characteristics of wide-range controllable stepless speed regulation and high power density, hydraulic transmission has been paid more and more attention in the research of vehicle transmission, but there is a serious problem of low transmission efficiency in the development of vehicle hydraulic transmission.

Although the hydraulic components can realize continuously variable transmission in a wide range and the performance is close to the ideal characteristics, but the efficiency is obviously lower than that of pure mechanical transmission; the manufacturing precision of hydraulic components is high, the cost is high, and the manufacture of high-power hydraulic components is more difficult

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