Piston crank mechanism of reciprocating internal combustion engine

• Main Authors: AOYAMA, SHUNICHI, HIYOSHI, RYOSUKE
• Format: Patent
• Language: English; French; German
• Published: 17.08.2011
• Subjects: BEARINGS; BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; CYLINDERS; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINE PLANTS IN GENERAL; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENTTYPE, e.g. STEAM ENGINES; MECHANICAL ENGINEERING; PISTONS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SEALINGS; SHAFTS; STEAM ENGINES; THERMAL INSULATION IN GENERAL; WEAPONS

A piston crank mechanism of a reciprocating internal combustion engine including a piston moveable through a stroke in the engine and having a piston pin and a crankshaft changing reciprocating motion of the piston into rotating motion and having a crankpin, the piston crank mechanism comprising: an upper link connected at one end to the piston via the piston pin; a lower link connected at one end to the piston via the piston pin; a control link connected at one end to the lower link via a second connecting pin and pivoted at its other end to a body of the engine to permit oscillating motion of the control link on the body of the engine; a center-of-gravity of the lower link lying inside of a triangle defined by three vertexes corresponding to a center of the first connecting pin, a center of the second connecting pin, and a center of the crankpin; and a distance from the center-of-gravity to the center of the crankpin is less than at least one of a distance from the center-of-gravity to the center of the first connecting pin and a distance from the center-of-gravity to the center of the second connecting pin.