The Analysis For Mechanical Characteristics Of The Spatial Crank-swing Mechanism

So far, the research of the spatial RCCR and RCRCR mechanism are concentrated in the situation of input and output offset being equal, which is named the spatial double crank mechanism for its perfect constant velocity property. However, in the situation of input and output offset are not being equal, the current cognition is the rotated-swing relationship between input and output movements. Because of its following advantages:simple organization with only four or five bars, components connected with lower pair, good abrasion resistance, simple shapes easy to manufacture and assemble. And most important one is that in unconsidering the interference of assembly, the angle between input axis and output axis can be any value within the scope of(0°,180°). As a result, we name this shape as the spatial crank-swing mechanism, and do more adequate theoretical research to make the application more popular and reliable.This thesis adopts combined method of theoretical analysis and computer simulation to do the following research of the state of the spatial crank-swing mechanism in the status of ideal friction-free.1) The motion analysis of the spatial crank-swing mechanism. This thesis adopts CPP (coordinate-plane-projection) method to simplify closed spatial vector equations to get each component motion parameters. The simulation motion analysis is completed in the SolidWorks environment, so the rotated-swing relationship between input and output movements and the reliable of theoretical research are certificated. The corresponding curves of motion parameters with structural parameters are also plotted.2) The kinetostatic analysis of the spatial crank-swing mechanism. This thesis adopts the method of showing reactions at one joint to get each constraints reaction and input rotation driving moment. The simulation dynamics analysis is completed in the SolidWorks environment in both pure rigid body and using the flexible connection body, so the two analysis results are compared and the corresponding curves of mechanical parameters with structural parameters are also plotted. 3) The comparison of two types of the spatial crank-swing mechanism. According to the calculation of DOF, motion analysis and kinetostatic analysis of the two types, the similarities and differences between the two is summarized.4) The total center-of-mass trace-analysis of the spatial crank-swing mechanism. This thesis uses coordinate conversion method to get each component expression of total center-of-mass trace and plot the three-dimensional curve. Extract the total center-of-mass trace from the simulation results, so the reliable of theoretical research is certificated.