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近代摩托车用汽油机普遍采用顶置凸轮轴结构(OHC)和组合式气门弹簧。每个气门都配置两个旋向相反的圆柱螺旋压缩弹簧,减小了弹簧外形尺寸,获得了较平稳的弹簧特性,与气门惯性力曲线匹配得更合适。根据气门运动规律设计气门弹簧特性,按等强度原则设计组合式气门弹簧。
Modern motorcycle gasoline engine commonly used overhead camshaft structure (OHC) and combined valve spring. Each valve is equipped with two oppositely rotating cylindrical helical compression springs, reducing the overall dimensions of the spring, resulting in a smoother spring characteristic that is more suitable for the valve inertia curve. According to the valve movement design valve spring characteristics, according to the principle of equal strength design combination valve spring.