US 11,808,320 B2
Rolling vibration reduction device for internal combustion engine
Hiroki Iguma, Shizuoka-ken (JP); Ryota Tsuda, Susono (JP); Tomohito Ono, Susono (JP); and Keiju Tomoda, Shizuoka-ken (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Mar. 21, 2022, as Appl. No. 17/699,753.
Claims priority of application No. 2021-050597 (JP), filed on Mar. 24, 2021.
Prior Publication US 2022/0307571 A1, Sep. 29, 2022
Int. Cl. F16F 15/26 (2006.01)
CPC F16F 15/262 (2013.01) [F16F 2230/0011 (2013.01); F16F 2232/02 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A rolling vibration reduction device for an internal combustion engine, the rolling vibration reduction device comprising:
a main inertial system configured to rotate with a crankshaft of the internal combustion engine, the main inertial system including a drive gear coaxially mounted to the crankshaft;
a driving force transmission mechanism configured to transmit a rotational driving force of the crankshaft, a direction of the rotational driving force being reversed by the driving force transmission mechanism; and
a sub-inertial system configured to rotate by the rotational driving force transmitted from the driving force transmission mechanism and to reduce rolling vibration of the internal combustion engine associated with rotation of the crankshaft by rotating in an opposite direction to the crankshaft, the sub-inertial system including a driven gear coaxially mounted on a rotor shaft of a motor generator,
wherein a torsional resonance frequency in the rolling vibration reduction device is set to a value higher than an explosion primary frequency at a maximum engine speed in a preset operating region of the internal combustion engine.