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易安迪Dash 2系列

易安迪Dash 2系列(英語:EMD Dash 2)是美国通用汽车易安迪公司(GM-EMD)在1972年1月1日起推出的电力传动柴油机车产品线,该系列机车的设计重点是致力于改善机车运用可靠性及经济性,最初推出的五种基本车型功率涵盖2000马力到3600马力等级,包括2000马力的GP38-2型SD38-2型柴油机车,3000马力的GP40-2型SD40-2型柴油机车,以及3600马力的SD45-2型柴油机车,分别取代上一代的GP38SD38GP40SD40SD45型柴油机车

易安迪Dash 2系列柴油机车全部装用经过改进的易安迪645E系列柴油机,与以往生产的645E系列柴油机相比,新柴油机改进了上活塞环位置、增大气缸套气口直径、采用全宽式气缸盖密封垫、主轴承轴瓦加装镍托等。电路系统方面,机车采用了已经在DDA40XSD45X型柴油机车上经过验证的模块化电子控制系统,在控制电路广泛采用了易于更换的插入式印刷电路板,全部控制电路及保护系统分装在17块电路板上,取代使用寿命较短且可靠性较低的有触点机械开关,便于迅速查找故障并节省维护时间。同时,机车主电路中取消了牵引电动机磁场削弱分路。

除此之外,六轴的Dash 2系列柴油机车装用了新一代的HT-C转向架,取代了以往SD系列机车使用的“Flexicoil”三轴转向架。HT-C转向架的主要设计目标是使机车达到最大可能的牵引能力,转向架必须能够充分利用最大的粘着重量,并且将各轴之间的轴重转移尽可能降至较低水平。HT-C转向架的主要特点包括:具有较大刚度的橡胶摇枕弹簧二系悬挂装置、牵引电动机顺置布置、大直径心盘及低位牵引装置等。

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易安迪Dash 2系列
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