Abstract
Vibration is an important issue faced by reciprocating piston engines, and is caused by reciprocating inertia forces of the piston set. To reduce the vibration without changing the main structure and size of the original engine, we proposed a novel coaxial balance mechanism design based on a compact unit body. By introducing a second-order balance mass, this mechanism can significantly increase the efficiency of vibration reduction. The proposed mechanism can effectively balance the first-order and second-order inertia forces with the potential of balancing high-order inertia forces. To accurately determine the second-order balance mass, a closed-form method was developed. Simulation results with a single-cylinder piston DK32 engine demonstrate the effectiveness and advantage of the proposed mechanism. At a crankshaft speed of 2350 r/min, compared with the first-order balance device, the average root mean square velocity of the test points on the engine’s cylinder was reduced by 97.31%, and the support reaction force was reduced by 96.54%.
Highlights
Vibration is one of the most commonly observed phenomena in reciprocating piston engines, and this with a single cylinder
We focused on achieving vibration reduction of a single-cylinder engine by reducing the inertia force, aiming to design a mechanism that can eliminate the effect of inertia force as much as possible
A set of novel coaxial balance mechanisms [25] that can automatically balance firs and second-order inertia forces was designed in this study by comprehensiv3eolfy15conside ing the manufacturing cost, size limitation, and engine vibration reduction
Summary
Vibration is one of the most commonly observed phenomena in reciprocating piston engines, and this with a single cylinder. We focused on achieving vibration reduction of a single-cylinder engine by reducing the inertia force, aiming to design a mechanism that can eliminate the effect of inertia force as much as possible. A set of novel coaxial balance mechanisms [25] that can automatically balance firs and second-order inertia forces was designed in this study by comprehensiv3eolfy15conside ing the manufacturing cost, size limitation, and engine vibration reduction. Using a novel closed-form method to calculate second-order inertia force is an important means of reducing single-cylinder engine vibration. This method can be adapted to improve the high-order balance performance of the multiple-cylinder engine because it still provides accurate results if the effect of fourth-order inertia force is further considered
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