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Reason for
selection:
Automotive exhaust gas regulations in a number of countries of the world have been tightened in recent years. Particularly, regulations on PM and NOx emitted from diesel engines have become more stringent. Under the circumstances, a turbocharger is now an indispensable component because it works not only to maintain horse powers but also to purify exhaust gas and to improve fuel efficiency so that environmental burdens may be reduced.
Capturing this trend, the applicant has developed [CK-SMiTH], a new product, through making the turbine housing of a turbocharger with sheet product leading to weight reduction of the component and to a drastic upgrading of temperature-raising performance of the automotive catalyst.
Turbochargers must take in exhaust gas of elevated temperature and have been conventionally made of cast iron for ensuring necessary heat resistance and durability.
To make [CK-SMiTH], heat-resistant ferritic stainless steel sheet, which is difficult to process, is press-formed into a complicated shape and a dual structure of outer pipe and inner pipe is employed. With such ingenuity, [CK-SMiTH] performs better than conventional cast iron turbochargers in terms of heating the automotive catalyst and purification of exhaust gas. Making the component with sheet product also reduces its weight by 15% and contributes to the improvement of fuel efficiency.
[CK-SMiTH] is the world’s first such product for diesel engines and is expected to expand applications of stainless steel.
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