| 摘要 |
In an internal combustion engine, comprising: an upper link (11) connected via a piston pin (21) to a piston (32) that reciprocates within a cylinder; a lower link (12) attached to a crank pin (33b) of a crankshaft (33) to be free to rotate and connected to the upper link (11) via an upper pin (22); and a control link (13) which is connected to the lower link (12) via a control pin (23) and oscillates about an oscillation central shaft (24), the following equation is established when the piston (32) is at bottom dead center <?in-line-formulae description="In-line Formulae" end="lead"?>cos(thetal+alpha)<cos(thetal+pi)<?in-line-formulae description="In-line Formulae" end="tail"?> where: thetal is a lower link attitude angle; and alpha is a lower link aperture angle. As a result, a load acting on a crank journal when the piston is at bottom dead center can be reduced.
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