Abstract
A Planetary Gear Train (PGT) can be used in series-parallel transmission to redistribute powers. Selectable one-way clutches (SOWCs), compared with traditional friction clutches, can simplify controls and diversify patterns especially for hybrid transmissions. In this paper, a nonlinear torsional model of a power-split PGT coupled with three SOWCs is proposed. Piecewise nonlinearities of SOWCs as well as clearance, time-varying mesh stiffness, and synthetic transmission error of the PGT are considered. With a specified group of comprehensive evaluation indices, influences of piecewise nonlinearities of SOWCs are explored. Simulation results show that the piecewise nonlinearities of SOWCs can diminish collision range and reduce resonances of the PGT. Further research studies on parameter configurations of each SOWC reveal that of the three SOWCs, stiffness and radius of the SOWC connected to the sun gear of the PGT are dominant factors. Large stiffness and effective radius of the SOWC render the PGT fall into chaos on lower meshing frequencies; however, enormous impact vibrations occur to the SOWC if it gets too soft. Additionally, the increase of the damping ratio of the SOWC connected to sun gear can distinctly reduce the vibration and maximum dynamic load of the system on the entire working range.
Highlights
Friction clutches, as common executive mechanisms, are widely used in vehicle transmissions
Dynamic characteristics of the system are relatively simple on the range of 0–600 Hz, and this paper focuses on a meshing frequency range of 600–1600 Hz
To investigate the influences of Selectable one-way clutches (SOWCs) on each position and avoid synchronies, three theoretically different SOWCs are used in Case A. ey have same parameters except for their radius
Summary
As common executive mechanisms, are widely used in vehicle transmissions. To resolve the defect of single direction transmission of OWCs, controllable transformations, which add assembly elements to manage the trigger of engagement, reinforce SOWCs by providing options of transferring torque in neither direction, either direction, or both directions. Parameter configurations of SOWCs and their influences on torsional oscillations need further research. Multiple nonlinearities of PGT and SOWCs render complex dynamic behaviors that greatly affect the transmission quality and reliability. Several research studies have been proposed with gears and OWCs, the dynamic behaviors of PGT with three SWOCs under the influences of the floating ring gear, sun gear, and carrier of the PGT are not clear. Is paper establishes a nonlinear torsional model of a two DOF singlestage PGT coupled with three SOWCs. Gear clearance, time-varying mesh stiffness, synthetic transmission error, and piecewise characteristic of SOWCs are considered. Complex dynamic behaviors are revealed. e research results can be used to guide the parameter configurations of SOWCs
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