Chagas, C., Freitas, T., Falleiros, M., Silva, A. et al., "Innovative Product and Project for Timing Chain Drive System with Increase in Transmission Efficiency," SAE Technical Paper 2013-36-0122, 2013, doi:10.4271/2013-36-0122.
A proper way to innovate consists in identify some kind of customer dissatisfaction and within this observation the companies ought to develop products which will be acceptable by the market. Only in this way, companies will be able to stand out in front of their competitors and the innovative companies can create new needs and valuable knowledge. More and more, the automotive vehicle consumers tend to opt internal combustion engines which use chain drive in their timing system, since the chain drive system presents high durability, avoiding the usual maintenance common to the belt timing system. The necessity of developing parts which increase the efficiency and minimize the fuel consumption, noise and vibration in the timing chain drive system lead the study and comprehension of some physical phenomena. It is inherent to the chain drive system the fluctuation of the angular velocity between shafts, this feature is known as “polygonal action”. In the present work the fluctuation of the angular rotations between camshafts and crankshafts are treated by the geometry of the transmission. Initially, the chain drive is modeled as being a four bar linkage, following by a more complex way, which uses theory of instant center of zero velocity and acceleration to understand the role of each chain link and the chain guide profile. The chain guides have presented fundamental importance to increase the efficiency of the chain transmissions, consequently, a better understanding about its profile and others phenomena such wear and manufacture process allowed the developing an innovative chain guide which is adaptable and can find market demand.