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符号及其意义 θ1-阀片在弹簧力的作用下自由关闭所需要的时间对应的曲柄转角（度）; θ2-阀片在弹簧力与气体力的同时作用下开始关闭时至本行程止点曲柄转过的角度 （度）; θ3-阀片开始开启至本行程终点曲柄转过的角度（度）;
Symbols and their meanings θ1-valve plate in the spring force of the role of the time required to turn off the corresponding crank angle (degrees); θ2-valve in the spring force and gas force at the same time start to close to the end of this stroke Angle of crank rotation (degrees) θ3 Angle (degrees) at which the valve starts to turn to the end of the stroke crank,