To provide a variable compression ratio mechanism of an internal combustion engine for improving controllability and reliability.
This variable compression ratio mechanism of the internal combustion engine, variably controls the engine compression ratio by a relative positional change in a rocking center position of a control link 25 caused by rotation of a control shaft 23, by rotating the control shaft 23 by an actuator 30. The actuator 30 has an actuator shaft 32 and an actuator shaft driving member 34 engaging with the actuator shaft 32 via a trapezoidal screw part 41 (a screw mechanism), and is set so that the size of force acting on the trapezoidal screw part 41 changes with the lapse of time, by setting the direction of the force acting on the trapezoidal screw part 41 constant, when an engine rotates at a low speed, and the direction of the force and the size of the force acting on the trapezoidal screw part 41 change with the lapse of time, when the engine rotates at a high speed.
COPYRIGHT: (C)2007,JPO&INPIT
MOGI KATSUYA
TANAKA YOSHIAKI
TAKEMURA SHINICHI
SUGAWARA NARIFUMI
SAKATA AKIRA
MITSUBISHI ELECTRIC CORP
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Tomioka Kiyoshi