车用,船用、摩托车用的各种内燃机,为取得迅速发展,要求进一步提高零部件的性能、延长使用寿命,同时还要降低价格。特别是机动车,无论是摩托车和汽车,汽油车和柴油车,都将随着日本国内高速公路网的扩大,在实现高速化、高功率化的同时,用户对长寿命、低油耗、简易维修提出了强烈要求。 In order to achieve rapid development, various types of internal combustion engines for vehicles, boats and motorcycles are required to further improve the performance of parts and components, extend their service life, and at the same time reduce the price. In particular, motor vehicles, both motorcycles and automobiles, gasoline vehicles and diesel vehicles, will expand their expressway networks in Japan to achieve high-speed and high-power production. Meanwhile, users will have a long-life, low fuel consumption, Maintenance made a strong demand.