| 摘要 |
PROBLEM TO BE SOLVED: To avoid a lock state of a reciprocating piece, when a control shaft operates at a maximum-minimum operating angle or more, without using a special member, by regulating a screw lead angle of the reciprocating piece by an operating angle of the control shaft. SOLUTION: This variable compression ration mechanism has the control shaft 9 arranged in parallel to a crankshaft and provided with an eccentric cam 10, a control plate 14 integrally arranged on this control shaft 9, the reciprocating piece 20 for slidably connecting a pin of a tip part to a slit of this control plate, and a rotatingly driving source for changing the internal combustion engine compression ratio by moving the reciprocating piece in the shaft direction by fixed position rotation by meshing with a base end part screw part of this reciprocating piece. The control plate 14 abuts on a stopper arranged in a position of a turning angleθor more of the control shaft 9 determined by an expression of tan<SP>-1</SP>(p/πd)+tan<SP>-1</SP>μ≤θ(in the expression,μ: a friction coefficient, p: a screw pitch, d: a screw diameter, andθ: an angle formed of a fork of the control shaft and a vertical shaft), when the control shaft 9 is at the maximum-minimum operating angle or more. COPYRIGHT: (C)2006,JPO&NCIPI
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