Fundamental study on countermeasures against subharmonic vibration of order 1/2 in automatic transmissions for cars

¹ Graduate School of Engineering, Oita University, 700 Dannoharu, Oita-shi, Oita, Japan
² Department of Mechanical and Energy Systems Engineering, Oita University, 700 Dannoharu, Oitashi, Oita, Japan
³ Department of Mechanical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima-shi, Kagoshima, Japan

^* Corresponding author: ryu@oita-u.ac.jp

Abstract

In automatic transmissions for cars, a damper is installed in the lock-up clutch to absorb torsional vibrations caused by combustion in the engine. Although a damper with low stiffness reduces the torsional vibration, low-stiffness springs are difficult to use because of space limitations. To address this problem, dampers have been designed using a piecewise-linear spring having three different stages of stiffness. However, a nonlinear subharmonic vibration of order 1/2 occurs because of the nonlinearity of the piecewise-linear spring in the damper. In this study, we experimentally and analytically examined a countermeasure against the subharmonic vibration by increasing the stages of the piecewise-linear spring using the one-degree-of-freedom system model. We found that the gap between the switching points of the piecewise-linear spring was the key to vibration reduction. The experimental results agreed with results of the numerical analyses.