The effect of dwell angle on vibration characteristics of camshaft bearing housings

摘要

Cam-follower mechanisms are affected by undesired dynamic forces which may disrupt the accuracy of the follower motion. These undesired dynamic forces create vibrations which cause noise, wear, and increasing operating costs for cam-follower mechanisms. Journal bearings are the most widely-used mechanical parts in internal combustion engines under high load and high operating speeds. In this study, the effect of the dwell angle on the vibration characteristics of camshaft bearing housings was investigated. Two camshafts having a 6 mm lift and different dwell angles were tested at operating speeds of 450, 900, 1350, 1920, and 2400 rpm. The collected data were analyzed in detail. It was observed that with the increasing of the camshaft rotational speed, vibration responses of greater magnitude were obtained. In general, the first and second peak values of the low dwell angle camshaft were higher than those of the high dwell angle camshaft.