抄録
Toyota Motor Corporation has developed a new series of engines based on the Toyota New Global Architecture (TNGA) design
philosophy with even better fuel economy and stronger dynamic performance. These engines incorporate innovative design
elements that boost combustion speed, helping to achieve thermal efficiency in excess of 40% and specific power of 60 kW/L.
Essential elements for high-speed combustion are the coefficient of flow at the intake port and the tumble ratio. Laser clad valve
seats were adopted to enhance both of these elements. This paper describes the development of a laser cladding process that
improves production efficiency and reduces the size of the cladding machine, with the aim of enabling the production of the TNGA
engine series for different markets around the world.
