Clutch hydraulic control system of single-planet-row convergence hydraulic mechanical continuously variable transmission

Abstract

A clutch hydraulic control system of a single-planet-row convergence hydraulic mechanical continuously variable transmission comprises a gear-shifting mechanism clutch control system, a planet-row clutch control system, a lubrication cooling system and an oil supply system. Control pressures required by the gear-shifting mechanism clutch control system, the planet-row clutch control system and the lubrication cooling system are sequentially decreased. The clutch hydraulic control system has the advantages that accurate pressure control, gentle pressure change and supplementation of a small amount of oil leakage are ensured by using a clutch energy accumulator; a synchronizing clutch behind a planet row is controlled by adopting a magnetic exchange valve, and the hydraulic control cost is reduced on the basis that gear shifting is basically stable; the intelligence degree of the system is improved and energy consumption is reduced by using a temperature sensor; an oil supply pump adopts a small-displacement high-pressure gear pump and meets the requirements for large clutch control oil way pressure and low required oil quantity; a large-displacement low-pressure gear pump is used for cooling and meets the requirements for low cooling lubrication oil way pressure and large oil quantity.

Description

Technical field [0001] The invention relates to a control system for controlling a clutch by fluid pressure, in particular to a clutch control system in a continuously variable transmission hydraulic control system. Background technique [0002] When a vehicle is running, its load varies with road conditions and driving conditions. Especially for non-road vehicles such as high-horsepower agricultural vehicles and construction vehicles, they have large transmission power, harsh operating environments, and frequent external load fluctuations. The transmission is required to change the speed and torque in a timely manner to adapt to the continuous changes of the actual load, and to ensure the power and fuel economy of the vehicle. Although traditional stepped gearboxes can meet certain requirements by shifting gears, they can only transmit power according to a fixed transmission ratio and cannot achieve continuous transmission. If the gears are increased, the mechanical structure of...

AI Technical Summary

Problems solved by technology

In order to expand the transmission ratio range and improve transmission efficiency, HMCVT usually uses multiple clutches and planetary mechanisms to form a multi-stage continuously variable transmission mechanism. To change the speed, it is also necessary to control the engagement and separation of the clutch to realize the switching of the working section, which is complicated and difficult to control

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