The Design, Research And Multi-conditions Analysis Of A New-type Continuously Variable Transmission

Continuously variable transmission (CVT) is widely used in every drive field becauseof its good shift-feel, comfort, fuel economy, convenient operation, etc. The research onCVT has always been the hotspot and difficulty. Through the research and analysis ofseveral kinds of mechanical continuously variable transmission, defects of larger speedfluctuation and smaller transmission ratio problems existing in mechanical continuouslyvariable transmission are found. A mechanical continuously variable transmission withnew-type structure is then presented to solve those problems above.Compared with traditional continuously variable transmission, the main difference isthat this new-type CVT used a special conical cam mechanism in its structure. Besides, thedesign of two ends’ profile curve of the conical cam is based on the follower’s combinedmotion law of the uniform motion and sine acceleration. Combined with the use ofoverrunning clutches, an ideal uniform output motion can be obtained in theory.SolidWorks software is used to create the CVT’s3D entity model and assembly model.ADAMS software is used to process kinematics and dynamics simulation of the CVT’sassembly model and simulation results comparison with existed CVT. HyperWorkssoftware is used for modal analysis and linear static analysis of the CVT’s important parts.Finally, processing performance analysis under multi-conditions is proposed to make clearits working performance under different conditions.According to the simulation results, the output shaft obtained a constant velocity frominput which is transmitted from the conical cam mechanism, gear mechanism andoverrunning clutches. The results are consistent with theoretical analysis. The CVT’stransmission ratio is better than traditional CVT’s after calculation. The new-type CVT canrealize stepless speed change when swing links move on the conical cam’s surface alongspline shafts. Synthesizing finite element analysis results and condition analysis resultsshows that the CVT’s structure meets the requirement of intensity and rigidity. Its workingperformance under different conditions is also proved stable and good.