第三章 鍵,花鍵及銷聯(lián)結(jié)

1、3 鍵、花鍵和銷聯(lián)接Key, spline and pin joints3-1 鍵聯(lián)接 Key joints3-2 花鍵聯(lián)接 Spline joints3-3 銷聯(lián)接 Pin joints 3-1 鍵聯(lián)接 Key joints 分類 Types of the key joints平鍵聯(lián)接的尺寸選擇和強度計算Option of sizes and strength calculations for straight key joints一、分類 Types of the key jointsKey jointsLoose jointsTight jointsStraight key joints

2、Woodruff key jointsOrdinary straight key jointsGuiding and sliding straight key jointsTaper keyTaper key jointsTangent double-taper key joints1. 普通平鍵聯(lián)接Ordinary straight key jointsRounded end Square endOne rounded and one square end2. 導向平鍵和滑鍵Guiding and sliding straight key3. 半圓鍵 Woodruff key4. 楔鍵聯(lián)接

3、Taper key joint5. 切向鍵聯(lián)接 Tangent double-taper key joint1、失效形式Types of failure主要失效形式 The main types of failure：工作面壓潰Crushing（靜聯(lián)接 Fixed joints）工作面磨損 Wear（動聯(lián)接 Sliding joints）二、平鍵聯(lián)接的尺寸選擇和強度計算Selection of sizes and strength calculations for straight key jointsv有時：鍵剪斷shear failure of the key（一般不作計算，重要時驗算 N

4、o such strength calculations are required in designing.） 工作面的壓潰或磨損發(fā)生在鍵、軸和轂三者中較弱的零件上，一般為轂。Crushing or wear of the operating surfaces usually take place on the elements of which the strength is weakest among the key, shaft and hub. And it usually occurs on the hub.2. 計算公式 Calculations3. 平鍵聯(lián)接的計算步驟 Desi

5、gn procedure for straight key joints 花鍵聯(lián)接的特點 Features of spline joints 花鍵聯(lián)接的分類 Types of spline joints 3-2 花鍵聯(lián)接 Spline joints依靠軸和轂上齒的互壓傳遞轉(zhuǎn)矩，可用于動聯(lián)接和靜聯(lián)接。The teeth of shaft and hub press each other, through which the torque is transmitted. The spline joints can be used for both fixed and sliding joints.

6、 一、花鍵聯(lián)接的特點 Features of spline jointsWith respect to straight key joints:Uniform force distributionLess stress concentrationMore accurately centeredTeeth are difficult to be manufactured二、花鍵聯(lián)接的分類 Types of spline joints（矩形花鍵 Rectangle spline、漸開線花鍵Involute spline 、三角形花鍵Triangle spline ）三、花鍵的定心方式Centeri

7、ng methods of spline 矩形花鍵定心方式Major diameter fit Minor diameter fit Fit on sides of spline漸開線花鍵定心方式Major diameter fit Side fit3-3 銷聯(lián)接 Pin joints 銷聯(lián)接的功用 Functions of pin joints 銷的分類 Types of pin joints（1）定位 Locating （2）安全裝置 Safety device （3）傳遞不大的載荷 Transmit relatively small loads一、銷聯(lián)接的功用 Functions of pin joints二、銷的分類 Types of pin（1）普通圓柱銷 Plain cylindrical pins （多次裝拆，定位精度下降 Locating precision is lowered after disassembled many times） （2）普通圓錐銷 Plain taper pins （錐度1：50 、自鎖、可以多次裝拆 With a taper of 1:50,selflocking, may be disassembled for many times ）v（3）特殊形式銷 Spe