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To meet the long life expectancy and durability of the constant velocity joint (CVJ) boots an analytical study for CVJ boots using new material Thermoplastic Elastomer(hereafter TPEE) has been carried out in the paper. TPEE is known to be the new thermoplastic elastomer material featuring superior mechanical and chemical properties compared to the conventional chloroprene rubber. The deformation and contact characteristics of TPEE CVJ boots under the actual applied load conditions were analyzed through finite element method in the paper. The study has shown that the behavior of deformation and contact characteristics of TPEE CVJ boots under load can be modeled and predicted analytically. Also the study has shown that durability of the boots can be obtained by choosing the proper contraction ratio and thickness in the boots design.

This paper presents a discussion of the development of a viscous fan clutch with continuous linear variable speed control function for engine cooling system to reduce cooling fan noise and improve the overall fuel efficiency of the engine. It is well known generally that the operation of the engine cooling fan is one of the major noise and vibration sources in an engine as well as the major power consumption device in engine. By applying a fan drive clutch having a continuous speed control device providing the proper cooling air flow rate proportional to engine cooling load, it can be expected that the fan driving horsepower can be reduced and also fan noise and vibration can be reduced significantly. In the present study it is shown that a viscous fluid fan clutch, for small and medium diesel engines (1 to 3.5 ton class), having a linear variable speed control function corresponding to cooling load and low temperature hysteresis has been developed.

The thermal design for a new compact circular external type water cooled engine oil cooler has been performed in the present study to meet the use of one of the typical DOHC 4 cylinder gasoline engine. The oil cooler examined in this study is characterized as one of the highly compact water cooling engine oil cooler having no offset strip fin in oil cooler core and no the encasing body housing. The oil cooler in this study is comprised of the heat exchanger core plates made of multiple identical wavy dimples to enhance the heat transfer in oil flow side and body is made of brazed stacking of identical core plates. In the study a thermal design model has been developed for this new compact water cooled oil cooler. The design model is validated through the experimental data of various coolant and oil flow rate plus temperature conditions. Also a predictive theoretical model has been made, based on the application of the actual thermal fluid flow pattern and construction geometry.

The thermal design for a new compact circular external type water cooled engine oil cooler has been performed in the present study to meet the use of one of the typical DOHC 4 cylinder gasoline engine. The oil cooler examined in this study is characterized as one of the highly compact water cooling engine oil cooler having no offset strip fin in oil cooler core and no the encasing body housing. The oil cooler in this study is comprised of the heat exchanger core plates made of multiple identical wavy dimples to enhance the heat transfer in oil flow side and body is made of brazed stacking of identical core plates. In the study a thermal design model has been developed for this new compact water cooled oil cooler. The design model is validated through the experimental data of various coolant and oil flow rate plus temperature conditions. Also a predictive theoretical model has been made, based on the application of the actual thermal fluid flow pattern and construction geometry.