| 摘要 |
PROBLEM TO BE SOLVED: To improve a sound deflection performance by enlarging the substantial curvature radius of a locus 11 of the connection center C1 between a control link 6 and a lower link 4 without lengthening the arm of the control link 6. SOLUTION: The lower link 4 mounted on a crank pin 2 is linked up with a piston pin 1 by an upper link 3, and also is linked up, by a control link 6, with the tip of a control lever 9 swingably supported by the eccentric pin 23 (an eccentric part) of a control shaft 5. A recessed circular arc gear 8 having the eccentric pin 23 as a center is disposed on the control shaft 5, and a convex circular arc gear 7 engaging with the recessed gear 8 is installed on the control link 6. Thereby, when oscillating the control link 6 around the connection center C2 between the control lever 9 and the link 6 as a fulcrum, the convex gear 7 is revolved along the recessed gear 8 in an oscillating direction.
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