The Principle Of The Static Pressure Coupled Clutch And The Vibration Problem Of The Relief Valve

In this paper, the transmission system of the vehicle was investigated and studied. The problems caused by the friction clutch and torque converter in the application of vehicle transmission were analyzed. On the basis of the planetary gear pump, a new type of hydrostatic coupling clutch is presented, which is based on the hydraulic-torque coupling relationship of the displacement pump (gear pump). The new clutch using hydrostatic transmission mode, but the difference is, it abandoned the traditional hydrostatic transmission system of pump-motor structure, and it use the innovation coupling hydrostatic transmission mechanism, so as to avoid the traditional hydrostatic transmission system of high speed transmission efficiency drop low disadvantage. Due to the different methods of transmission, it can, fundamentally, avoid the shortcomings of chatter by the friction clutch in the state of semi linkage. In the whole state, the transmission efficiency is much higher than that of the torque converter. Because of these characteristics, the hydrostatic coupling clutch has a high development potential.Based on the analysis of the basic mechanical principle of the hydrostatic coupling clutch, the mathematical model of the torque-slip difference in the fully coupled and semi-linkage of the hydrostatic coupling clutch is established. The calculation formula of the transmission efficiency of the hydrostatic coupling clutch is derived. The effect of oil viscosity and input speed on the efficiency of hydrostatic coupling clutch is analyzed. Design and manufacture the principle prototype of the hydrostatic coupling clutch. The torque test is carried out on the prototype, and the analysis result of the effect of oil viscosity and input speed on the transmission efficiency is verified.It is found that when the hydrostatic coupling clutch under the overload condition, the relief valve is prone to be unstable, which can endanger the stability of the clutch. The dynamic analysis of the valve core of the relief valve is carried out under the overload condition of the hydrostatic coupling clutch. A nonlinear dynamic model of the impact vibration of the valve core is established. The balance point of the valve core vibration is calculated by using the Lyapunov method. The model is linearized in the neighborhood of the equilibrium point. According to the stability of the linear equation and the Routh-Hurwitz criterion, the stability of the equilibrium point is judged. According to the conclusions of stability analysis, combined with the static pressure type clutch coupling mechanics model put forward the concept of clutch under the condition of critical slip difference. According to the vibration model and proposes method to reduce the critical slip difference.Write a MATLAB program of numerical calculation, ODE algorithm for the MATLAB standard was modified so that it can adapt to the impact vibration system. Through numerical calculation, analyzes the evolution process of valve vibration, vibration of the valve core by period-doubling bifurcation and collision bifurcation to chaos process was analyzed. Using the numerical results to draw the bifurcation diagram of the valve vibration, the bifurcation diagram of intuitive analysis of the different parameters of vibration and clutch on the spool of the critical slip difference effect.