The Exploratory Design And Research Of Hydrostatic Transmission Agent Structure In The High Speed Tracked Vehicle

A hydrostatic transmission agent structure of self-contained motors is design to drive a tracked vehicle to the high speed of 70 kilometers per hour. A new positive displacement pump patent model is built and used in this system. The assembly detail structure of motor and pump subsystem is finished by the classical mechanical design method.The failure parts and the design irrationality are modified and optimized by analysis the maximum Von Mises tress, its distribution and the deformation with a Finite Element Method (FEM) tool. In order to actualizing objective function of minimum power loss, the optimal radial and axial clearance width is found. A steady-state thermal-deformation coupled-field analysis is also accomplished by comparing the material of ZG34CrNiMo to super Invar. The result reveals that the axial thermal clearance deformation can be counterweighed by vanes and shells but the radial thermal clearance deformation can't. The material of super Invar is advised to use to minish the disadvantage of thermal deformation.To avoid the cavitation phenomenon, the inlet port of pumps is simulated by Computational Fluid Dynamics (CFD). The result reveals the minimum pressure between transmission agent and external environment.A new control valve, which controls and achieves the vehicle turn left, turn right and countermarch in different radiuses in high-speed, is designed instead of the differential mechanism to avoid tyres tracksliping.