Internal combustion engine

US4386589A · kind A · utility

Assignee

• MOTORENFABRIK HATZ GMBH & CO. KG

Inventors

• Ernst Hatz · Ruhstorf, DE
• Erich Absenger · Passau, DE
• Johann Schmuck · Bad Feilnbach, DE

Key dates

• Filing date: May 13, 1981
• Grant date: Jun 7, 1983
• Expiry date: May 13, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/2184
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A single cylinder internal combustion engine has a piston which drives a crankshaft and flywheel through a connecting rod and has a counterweight arrangement which balances forces produced by the moving engine elements. The counterweight arrangement includes a weight on the crankshaft and two weights on the flywheel which fully balance the forces produced by rotating motion of the engine parts and partially balance the forces produced by reciprocal motion of the engine parts. Two balance shafts are provided which are parallel to and driven synchronously with the crankshaft. The balance shafts have respective first weights thereon which complete the balance of forces produced by the reciprocating motion of engine parts and have respective second weights thereon which balance the moment of the first weights with respect to the axis of the cylinder.