Patent ID: 7527026
Filing Date: 2009-05-05
Classification: F02B

Abstract:
1. A variable compression ratio piston and rod assembly for an internal combustion engine, said assembly comprising: a piston having a pin bore centered along a first axis; a piston pin disposed in said pin bore; a connecting rod having a lower crank end and an upper piston end, said upper piston end including a rod bore centered along a second axis that is offset from and parallel to said first axis of said pin bore; an eccentric bushing pivotally interconnecting said piston pin and said rod bore, said eccentric bushing including a bore along said first axis that receives said piston pin and an eccentric outer journaled portion carried in said rod bore, said eccentric bushing being rotatable so as to effect a spatial displacement between said piston and said connecting rod to alter the compression ratio created by said assembly when operatively disposed in an internal combustion engine: an actuator selectively energizable for producing an actuation impulse; a latch responsive to said actuation impulse for movement between a latched position in which said eccentric bushing is fixed in one of at least two rotated positions, and an unlatched position in which said eccentric bushing is freely rotatable relative to said connecting rod; and a force transmitter for transmitting an energizing force to said actuator, said force transmitter being mechanically isolated from the acceleration fields of said connecting rod such that inertial accelerations experienced by said connecting rod do not influence said force transmitter.