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Technical Paper

Dynamic Connecting Rod Bolt Self-Loosening in Internal Combustion Engines

2010-04-12
2010-01-0692
As automobile manufacturers continue to strive toward delivering vehicles with the highest possible blend of fuel efficiency, reliability, performance and cost, new engine designs need to be as optimized as possible. A significant barrier to engine efficiency is unnecessary reciprocating and rotating mass in the internal combustion engine, which has driven the advancement of computer modeling and finite element analysis in order to optimize these components. As a consequence of this drive to reduce mass and cost, the safety factor of a component is made as low as possible. When a component is considered optimized for its environment and has a very low safety factor, any unforeseen stresses or strains may cause the part to fail or perform unexpectedly. Such stresses can be caused from engine misalignment, crank throw bending or abnormal combustion phenomenon.
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