Assessing the Propensity for Valve Train Tick Noise 2013-01-1737
Valve ticking noises within a cam actuated valve train can arise mysteriously. One valve train may produce valve ticking noises, while a second, geometrically similar valve train may perform more quietly. To better understand this phenomena, we examine in detail the prototypical motion of a valve driven by a rocker arm with cylindrical rocker pad. General features of a valve's motion through its guide, induced by a rocker arm with a cylindrical pad, are derived. From these general features of valve motion, guide contact points during lift events can be inferred, and as a result, detailed forces and moments acting on the valve may be derived. From this derivation of forces acting on the valve, a metric for assessing the propensity of a valve train to tick as a result of the valve stem impacting its guide is proposed. The proposed metric indicates how the likelihood of valve tick noise can be reduced through judicious choices for valve train geometries, clearances and surface finishes.
Citation: Geist, B., Resh, W., Fisher, S., McLean, I. et al., "Assessing the Propensity for Valve Train Tick Noise," SAE Int. J. Engines 6(1):637-646, 2013, https://doi.org/10.4271/2013-01-1737. Download Citation
Author(s):
Bruce K. Geist, William Resh, Scott Fisher, Ian McLean, Mark Hannon
Affiliated:
Chrysler Group LLC
Pages: 10
Event:
SAE 2013 World Congress & Exhibition
ISSN:
1946-3936
e-ISSN:
1946-3944
Also in:
SAE International Journal of Engines-V122-3, SAE International Journal of Engines-V122-3EJ
Related Topics:
Valve trains
Valves
Coatings, colorants, and finishes
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