| 초록 |
The engine timing chain system uses chains to transfer power from the engine crankshaft to the camshafts, and control engine timing. Hydraulic tensioners are normally applied for the proper operation of the chain system. In addition, it is controlled by hydraulic forces using engine oil and mechanical force from the spring. Recently, new technologies have been applied to the engine valve train in order to increase engine power and improve fuel efficiency. It also causes engine crank torsional vibration and cam torque increase, thus affecting stable chain motion and resulting in abnormal engine noise and vibration. Although timing chain system components are not the main cause for abnormal NVH, it was improved through the development of new hydraulic tensioners. Through this paper, we would like to explain the correlation between tensioner flow control factor and abnormal NVH. Furthermore, a new tensioner specification will be introduced for the improvement of engine abnormal noise. |
