《机械设计》 第10章 蜗杆传动设计 Chapter 10 Design of Worm Gears.pptVIP

PART Ⅱ Design of Mechanisms and Drives in Common Use;10.1 Introduction 概述;蜗杆蜗轮传动是由交错轴斜齿圆柱齿轮传动演变而来的。;小齿轮1的螺旋角?1很大，其分度圆柱直径d1较小，轴向长度b1较长、齿数(常称头数) z1很少(一般为1, 2, 4, 6)，每个轮齿在分度圆柱面上能缠绕一周以上，外形像一根螺杆，称为蜗杆。;1;10.1.2 Types of Worm Gears 蜗杆传动的类型;Types of Cylindrical Worm Gears;刀具两刃与蜗杆轴线共面； 轴面内相当于直线齿条，端面齿形为阿基米德螺线(Archimedes spiral) ；;渐开线蜗杆(involute helicoid worm)，简称ZI蜗杆——;法向直廓圆柱蜗杆(straight sided normal worm)，简称ZN蜗杆——;锥面包络蜗杆(cone enveloping worm)，简称ZK蜗杆——;10.1.3 Characteristics and Application of Worm Gears 蜗杆传动的特点和应用;电动蜗杆传动卷扬机;10.2 Kinematic Design of General Cylindrical Worm Gears 普通圆柱蜗杆传动的运动设计;1. Modules and Pressure Angle (模数和压力角);2. The coefficient of addendum and the coefficient of bottom clearance (齿顶高系数和顶隙系数);普通圆柱蜗杆模数、分度圆直径及其匹配 ;4. The number of threads of worm and the number of teeth of wormgear (蜗杆头数和蜗轮齿数);5. The lead angle of the worm (导程角);10.2.2 Characteristics of Modified Worm Gears 蜗杆传动变位的特点 ;凑中心距——变位前后，蜗轮齿数z2不变，仅改变中心距 ;10.2.3 Calculation of Geometric Dimensions of General Cylindrical Worm Gears 普通圆柱蜗杆传动的几何尺寸计算 ;蜗杆传动轮齿旋向、转向的判断——;10.3 Loading Capacity Calculation of General Cylindrical Worm Gears 普通圆柱蜗杆传动的承载能力计算;Calculating Rules——;2. Materials in Common Use;10.3.2 Force Analysis and Calculated Loads of Worm Gears 蜗杆传动的受力分析和计算载荷 ;Fa1;1;The load factor (载荷系数) K——由于蜗杆传动比齿轮传动平稳，且圆周速度不高，内部动载荷的影响可以不考虑，故取K=KA；KA—使用系数，同齿轮传动，查表。 ;使用系数 KA;10.3.3 Calculation of Contact Fatigue Strength of Worm Tooth Surface 蜗轮齿面接触疲劳强度计算 ;The Allowable Stress (许用应力);滑动速度影响系数，图，图;寿命系数;10.3.4 Calculation of Contact Fatigue Strength of Worm Gears 蜗杆传动的刚度计算 ;10.4 Efficiency, Lubrication and Heat Balance Calculation of General Cylindrical Worm Gears 普通圆柱蜗杆传动的效率、润滑及热平衡计算;2. The Sliding Velocity;10.4.2 Lubrication of Worm Gears 蜗杆传动的润滑;2. Selection of Lubricating Oil Viscosity;3. Selection of Lubricating Methods;10.4.3 Heat Balance Calculation of Worm