Research on the combined crank linkage mechanism with transient high precision sinusoidal output characteristics

ObjectiveIn response to the problem of the large distance between the two cranks of the composite crank connecting rod machine and to avoid the transient vibration and the phase error caused by the chain transmission, an innovative combination crank connecting rod mechanism with the transient high-precision sinusoidal output characteristics was proposed.MethodsThe transient characteristics of chain transmission on the output of the mechanism were analyzed and calculated, resulting in a maximum fluctuation torque of ±5%. A coaxial reverse transmission mechanism was designed to coaxially arrange two cranks, achieving smooth and precise transmission. Using Ansys software to analyze the torsion angle of the bevel gear shaft, taking into account the transmission backlash of the bevel gear, the error between the output law of this mechanism and the standard sine curve was analyzed.ResultsThe results indicate that the absolute speed error caused by the torsional deformation of the bevel gear shaft and the backlash of the bevel gear transmission is relatively small. Thus, the mechanism has transient high-precision characteristics, and can meet the low-cost testing requirements for products such as wave energy power generation devices and automotive suspension vibrations.