3504_四驱越野车转向驱动桥的设计.doc

四驱越野车转向驱动桥的设计 摘 要 本课题解决的主要问题：设计出适合本课题的驱动桥。四驱越野车传动系的总任务是传递发动机的动力，使之适应于越野车行驶的需要。在一般越野车的机械式传动中，有了变速器还不能完全解决发动机特性与越野车行驶要求间的矛盾和结构布置上的问题。首先是因为绝大多数的发动机在越野车上的纵向安置的，为使其转矩能传给左、右驱动车轮，必须由驱动桥的主减速器来改变转矩的传递方向，同时还得由驱动桥的差速器来解决左、右驱动车轮间的转矩分配问题和差速要求。其次，需将经过变速器、传动轴传来的动力，通过驱动桥的主减速器，进行进一步增大转矩、降低转速的变化。因此，要想使越野车驱动桥的设计合理，首先必须选好传动系的总传动比，并恰当地将它分配给变速器和驱动桥。 关键词： 差速器 驱动桥 四驱越野车 Abstract This topic to solve the main problems: design for the drive axle of the topic. Four-wheel-drive suv addition is passing the engine power transmission system, in order to adapt to the need of suvs driving. In general suvs mechanical transmission, the transmission can not completely solve contradictions between engine characteristics and suvs driving demand and structure arrangement. First, because the vast majority of engines in suvs on the placement of longitudinal, in order to make the torque can be passed on to the left and right driving wheels, must by the drive axle of the main reducer to change torque transmission direction, while also consists of drive axle differential to solve the left and right drive torque distribution between the wheel and differential requirements. Second, must be through the transmission, drive shaft of the power, through the drive axle of the main reducer, to further increase the torque, reduce the speed of change. Therefore, reasonable to make the design of the drive axle suv, you must first selected the total transmission ratio, transmission system and properly assign it to the transmission and drive axle. Key words: differential drive axle Four-wheel-drive suv 目 录 1前言 1 2总体方法论证 2 2.1转向驱动桥分析 2 2.2 结构方案的确定 2 2.2.1驱动桥的分析 2 2.2.2转向器的分析 2 2.2.3转向节的分析 2 2.3本车桥的结构 3 3主减速器的设计计算 4 3.1主减速器传动比的计算 4 3.2主减速器的选择 4 3.3主减速器齿轮的类型 5 3.4主减速齿轮计算载荷的确定 6 3.5主减速器齿轮基本参数的选择 7 3.5.1齿数的选择 7 表3-1 越野车驱动桥主减速器主动锥齿轮齿数（用于半展成法*加工时） 7 3.5.2节圆直径的选择 8 3.5.3齿面宽的选择 9 3.5.4双曲面齿轮的偏移距E 9 3.5.5双曲面齿轮的偏移方向 9 3.5.6齿轮法向压力角的选择 9 3.5.7齿轮几何尺寸的计算 9 3.6.1单位齿长上的圆周力 12 3.6.2轮齿的弯曲强度计算 13 3.6.3轮齿的接触强度计算 13 3