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Theory Analysis and Research on Dynamic Characteristics of Hydraulic Circuit of Shifting of Hmcvt

Author: JiaQing
Tutor: XiongGuoLiang
School: East China Jiaotong University
Course: Mechanical Manufacturing and Automation
Keywords: Hydraulic mechanical stepless transmission Hydraulic spread mechanism Dynamic characteristic Easy5 simulation
CLC: TH137
Type: Master's thesis
Year: 2009
Downloads: 174
Quote: 0
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Abstract


Hydraulic Machinery composite stepless transmission is a multi-power flow stepless transmission in this research field, the speed ratio can be automatically stepless adjustment, to achieve the best match of engine - gearbox - road load in order to achieve the best vehicle powertrain fuel economy and power. Gear for the process of shifting power interruption, the shift shock can be reduced to improve the ride comfort of the vehicle, the vehicle transmission is the ideal form. Hydraulic mechanical stepless transmission for the study, to carry out hydro-mechanical composite stepless transmission theory analysis and simulation research. This paper presents the best solution to a hydraulic mechanical composite stepless transmission; MSC Easy5 environment, the establishment of a hydro-mechanical stepless transmission hydraulic simulation model of the spread mechanism, based on state and non-linear aspects of the displacement control mechanism multi-model describes the method, the analysis shows that the model can be adapted to different hydraulic mechanical stepless transmission hydraulic modeling of convective mechanism; hydraulic convective mechanism of the electric displacement control mechanism to control the response characteristics of the current electric displacement control agencies exist to control the response of the current dead zone and hysteresis effects, the diameter of the orifice of their response characteristics have a significant impact, the orifice diameter decreases, the dead zone and hysteresis effects are more obvious, so step control current and appropriate increasing the orifice diameter can effectively reduce the dead zone and hysteresis; fluctuations in hydraulic mechanical stepless transmission to change the speed of the hydraulic components segment process piping vibration of factors, simulation results show that reducing the hydraulic circulating pipe mechanism the length of the pipe, the pipe diameter, hydraulic oil working volume, to extend the time in the process of reverse torque, can effectively reduce the fixed displacement hydraulic components in the reverse torque speed fluctuation and pressure shocks; paragraph breaks given row amount of hydraulic Component torque reverse, its speed and the volumetric efficiency of the hydraulic drive system to obtain a higher volumetric efficiency, the smaller the speed fluctuation, in order to counteract the influence of the volumetric efficiency is reduced during the reverse torque variable displacement hydraulic the displacement of the element, can effectively reduce the the speed fluctuation fixed displacement hydraulic components. Our research has revealed paragraph breaks in fluctuations in the speed of the hydraulic components and piping vibration influencing factors, and its measures to reduce shock and vibration, can effectively improve the the Hydraulic Machinery composite stepless transmission the paragraph breaks quality and dynamic characteristics.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Hydraulic transmission
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