第二次世界大战以后,为满足因石油危机所引起的节能需求及为环境保护制定的排放规则等社会要求,以美国为中心对使用中的载重汽车和建筑机械上的柴油机进行增压,包括汽油机在内的所有汽车发动机,都迅速而广泛地采用了增压技术。这种倾向,近年来在日本也很突出。 本文主要论述汽车发动机上使用的小型废气涡轮增压器的最新技术动向。 After the Second World War, the U.S.-centered diesel engines on used trucks and construction machinery were pressurized to meet the social requirements of the energy saving needs arising from the oil crisis and the emission regulations for environmental protection, including Gasoline engines, including all cars, are rapidly and widely used booster technology. This tendency has also been prominent in Japan in recent years. This article focuses on the latest technical trends in small exhaust gas turbochargers used in automotive engines.