The purpose of the oil jet is to provide oil to the underside of piston for cooling and noise attenuation. If the oil jet is used, there are some additional considerations like oil flow rate, oil pressure and oil temperature. To solve these problems, ...
The purpose of the oil jet is to provide oil to the underside of piston for cooling and noise attenuation. If the oil jet is used, there are some additional considerations like oil flow rate, oil pressure and oil temperature. To solve these problems, oil cooler and oil pump size-up can be applied. But in this case, the friction torque will increase. In this study, it was confirmed that the friction torque increases as using the oil jet system - oil jet, oil cooler and oil pump size-up. Also the portion of friction torque by each part was measured by changing engine assembly condition. The friction torque by oil jet and oil pump size-up was similar. The friction torque by oil cooler was as twice as by others.