An Analysis and Study of a Valve Variable Timing Mechanism in Engine
A valve variable timing mechanism in automotive engine is studied,and it's working principle and design thought is analyzed.The research put emphasis on mechanism composition and driving principle.The mechanism kinematical sketch for driving and adjusting is drawn and the freedom degree of the mechanism is calculated.The parametrical 3-D model is built and the output cam profile is drawn.The study indicates that the key points of the mechanism is to determine the optimal link length and ideal output cam profile based on requirements of engine.
This article analyses negotiations on democracy promotion by looking at the case of the Inter-American Democratic Charter. It argues that Venezuela contested the concept of representative d...