| Summary: | In recent years, high-power and low-cylinder engines are widely used. These engines produce a strong torsional vibration due to engine combustion in the powertrain. In automatic transmissions, a lock-up clutch which connects the engine and the gear train directly is operated in low engine rotation speed for fuel economy. The lock-up clutch operation in the low engine rotation speed causes the increase of vibration due to the resonance. To suppress the torsional vibration, a lock-up damper, a torsional spring, is attached in the torque converter. Centrifugal pendulum vibration absorbers (CPVA) are also developed for the countermeasure. However, the natural frequency of the CPVA varies in the large amplitude due to the nonlinearity, and large size of the centrifugal pendulum vibration absorber is needed to increase the suppressive effect. To overcome these problems, a new centrifugal pendulum vibration absorber with slider crank chain (SCDA) is invented. In this paper, the equation of motion of the SCDA is derived, and the suppressive effect of the SCDA is discussed theoretically. It is found that (1) the nonlinear natural frequency of SCDA can be designed almost linearly with its optimal link length ratio, (2) the SCDA with optimal link length ratio can suppress the vibration amplitude effectively, and (3) the suppressive effect of SCDA is larger than that of the CPVA.
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