第264章 拖拉机（下）
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一台拖拉机身上包含动机、传动、行走、转向、液压悬挂、动力输出、电器仪表、驾驶操纵及牵引等系统或装置，但是其中最重要的恐怕就要数动机或者动力系统。龙腾小说ltxsba.com网
早期的拖拉机使用的是蒸汽动力，这样的拖拉机笨重而昂贵，使用不便，效率也相对于其他动力的拖拉机来说也比较低。
除了蒸汽动力外，拖拉机还有两种动力疡，一种是汽油动机，一种是柴油动机。
两种动机相对比，前者比后者启动容易，噪音低，但辅助设备多，维修复杂，而后者扭距大，结构简单，可靠性高，耗油低，也可以说柴油动机出现故障几率比汽油动机小，容易维修，功率较大，但是柴油动机也有很明显的缺点，柴油动机工作振动大转低4ooo转5ooo转），噪音较大。
两者一对比，比较笨重的拖拉机还是疡柴油动机比较好，若是农用拖拉机批量生产销售，使用农业拖拉机的也只会是农民，柴油动机虽然噪音大，但是出现故障几率比较小，难道还能指望一个农民学会怎么维修拖拉机？这显然不现实。
柴油动机原本用是德国明家鲁道夫狄塞尔于1892年明的，不过中华帝国已经提前多年将柴油动机制造出来，帝国空军的飞艇就是用柴油动机来提供动力，只不过那是大型柴油动机。
虽然最开始的拖拉机比较笨重，但是也装不上大型柴油动机，柴油动机型化顺理成章，生产出适用于拖拉机的柴油动机。
当颜学义一行人走进厂区后，便看到数十号年龄最高不过三十岁的人在闻一辆实验型拖拉机转。
这辆实验型拖拉机宽2.5米长3.5米高1米多一些，看起来，感觉其全身都是拼凑起来的，一点也不美观，或许给其加一个外壳可能就好多了。
拖拉机的行走装置由引导轮、随动轮、支重轮、驱动轮及履带构成，这样的拖拉机可以称呼为履带式拖拉机。
行走装置衬托着拖拉机的底盘，底盘最前方则是一台裸露的柴油动机，一个竖立着的排气管和柴油动机相连，柴油动机一直在开动，而排气管也一直在冒出黑烟，若是拖拉机做出前进或者后退等动作时，排气管冒出的黑烟会更多。
柴油动机后面的位置是一个简易的驾驶室，任何遮挡都没有，甚至连一个正常点的座椅都没有，萨代之的是一个木质凳子，木质凳子上，一个被黑烟熏黑的人正在操纵着这辆实验型拖拉机，而这个人正是拖拉机厂的厂长郑友强。
郑友强今年二十六岁，是中华帝国第一所大学源河大学届毕业生，如今却已经成为永逸市拖拉机厂厂长，带领一班人马研究制造拖拉机。
颜学义一行人向着人群走近，即便拖拉机厂一众人再怎么痴迷拖拉机，也现颜学义一行人的到来。
别人不认识颜学义这位帝国皇帝，但是作为颜学义亲自任命的拖拉机厂厂长，郑友强可是亲眼见到过颜学义。
拖拉机正好正对着走近的颜学义一行人，郑友强双眼透过拖拉机排气管冒出的黑烟，看到迎面走来的颜学义一行人，郑友强一下子就认出来颜学义。
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