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The synchronous belt employed in the valve train of automotive engines is operated under fluctuating load. Two types of the belt vibration are observed. One is the well-known lateral vibration. The other is the vibration in the belt running direction which may cause the resonant vibration of the camshaft rotation and may affect the belt life. The purpose of this paper is to describe an analysis of the latter vibration. This vibration was analyzed using the model composed of the inertia moment of the camshaft system and the nonlinear elasticity of the belt in the running direction. The predicted resonant frequency and amplitude were in good agreement with the measured ones. The influence of each factor of the model on the vibration was also investigated. The stiffness in the belt running direction that is determined by the tooth distortion When the belt engages with the pUlley should be increased to reduce the amplitudes of the resonant Vibration.

Lubrication of a connecting rod bearing is analyzed by the theory of elastohydrodynamic lubrication (EHL). The hydrodynamic of a connecting rod bearing was calculated in consideration of not only the effects of bearing elastic deformation but also those of bearing shapes. Journal center loci were measured to confirm the accuracy of calculated results. The governing equations of EHL are the Reynolds equation, the clearance gap equaution and the load equation. The effects of the shapes of a connecting rod bearing were included in the clearance gap equaution. The calculated results agree well with the measured results. Results of this study show that lubrication of a connecting rod journal bearing is significantly influenced by bearing elastic deformation and shapes of a connecting rod bearing.

The 2ZZ-GE is a sporty 1.8 liter engine based on the 1ZZ-FE, which is currently being mass produced in Japan, USA, and Canada. It was designed to fit into the same engine compartment as the base 1ZZ-FE, have equivalent vehicle performance as a 2.2 liter engine, and meet TLEV emission standards. The main features of the 2ZZ-GE are the Metal Matrix Composite (MMC) reinforced all-aluminum cylinder block and the intelligent Variable Valve Timing and Lift (VVTL-i) system. These features were adopted for size and performance. Other features such as a reinforced ladder frame, and an intake manifold spacer was utilized for a sporty engine sound. The 2ZZ-GE delivers maximum power at 7600rpm and maximum torque at 6800rpm.