key, spline and pin joints解析.ppt

一、分类 Types of the key joints ⑵有时：键剪断shear failure of the key（一般不作计算，重要时验算 No such strength calculations are required in designing.） 工作面的压溃或磨损发生在键、轴和毂三者中较弱的零件上，一般为毂。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. §12-2 花键联接 Spline joints 三、花键的定心方式Centering methods of spline §12-3 销联接 Pin joints 一、销联接的功用 Functions of pin joints （3）特殊形式销 Special types of pin ① 孔未开通或拆卸困难时： 螺尾锥销 With thread for disassembly ②冲击、振动或变载荷时： 开尾锥销、槽销或弹性圆柱销（防松） With open slot for fastening § 12-4 其它联接 Other joints 一、成形联接 Shaped joints To join (metals) by applying heat, sometimes with pressure and sometimes with an intermediate or filler metal having a high melting point. 思考题 * * §12 键、花键和销联接 Key, spline and pin joints §12-1 键联接 Key joints §12-2 花键联接 Spline joints §12-3 销联接 Pin joints §12-4 其它联接 Other joints § 12-1 键联接 Key joints 分类 Types of the key joints 平键联接的尺寸选择和强度计算 Option of sizes and strength calculations for straight key joints * Selection of sizes and strength Calculations for straight key joints Key joints Loose joints Tight joints Straight key joints Woodruff key joints Ordinary straight key joints Guiding and sliding straight key joints Taper key Taper key joints Tangent double-taper key joints 普通平键联接 Ordinary straight key joints 平键的两侧面是工作面，靠键和键槽之间的互压传递转矩。The load is carried by the sides of straight keys. The both side surfaces of key and keyway press each other, through which the torque is transmitted. Rounded end Square end One rounded and one square end 导向平键和滑键 Guiding and sliding straight key 3. 半圆键 Woodruff key 4. 楔键联接 Taper key joint 楔键联接上下面为工作面，靠键、轴和毂之间的摩擦力以及键受到的偏压传递扭矩。Torque is transmitted by friction of above and below surfaces on the key, shaft and hub. 5. 切向键联接 Tangent double-taper key joint 切向键的工作面是两个楔键组成矩形的窄面，工作面上的挤压力沿轴的切线方向，靠挤压传递扭矩。Tangent double-