液压与气压传动Chapter_9.ppt

Fig.9-7 Principle chatr of hydraulic system principle chart with modular valves Chapter 9 Design of Hydraulic Transmission systems * Hydraulic and pneumatic pressure transmission * Chapter 9 Design of Hydraulic Transmission System 9.1 The Approach for Hydrostatic Circuits Design 9.2 A Design Example of Hydraulic System Introduction The design of hydrostatic transmission systems is an important part of the whole mechanical design and also a summarizing and comprehensive application of knowledge in previous chapters. The aim of this chapter is to show through an example how hydrostatic transmission circuits can be designed to satisfy a given set of requirements. 9.1 The Approach for Design of Hydrostatic systems 9.1.1 Determination of designed requirements 9.1.2 Analysis for working conditions and determination of main parameters 9.1.3 The determination of hydraulic system diagram 9.1.4 Hydraulic components calculation and selection 9.1.5 Performance check for a hydraulic system designed 9.1.6 Drawing of working diagrams and technical documents 9.1 The Approach for Design of Hydrostatic systems Fig.9-1 General design process for a hydraulic transmission system 9.1.1 Determination of designed requirements Before a hydraulic system is designed, the working conditions of the mainframe in the mechanical equipment must be analyzed. 1. The purpose of the mainframe, the overall arrangement, the limitations to the position of the hydraulic devices and their sizes. 2. The mainframe work cycle, the system actions, their sequence, interlock function, automatization. 3. The load on actuators and the ranges of speed, motion stability, position accuracy, conversion accuracy, etc. 4. Working environment and working conditions. 5. Working efficiency, safety, reliability, cost, etc. 9.1.2 Analysis for working conditions and determination of  main parameters Analysis of working conditions 1）Dynamic parameter