键·花键·销联接.pptVIP

一、分类 Types of the key joints §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 §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 * * §12-1 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 键、花键和销联接 Key, spline and pin 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 §12-1 键联接 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 工作面 间隙 轴 导向平键和滑键 Guiding and sliding straight key 起键螺孔 固定螺钉 3. 半圆键 Woodruff key 工作面 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-taper key joint comprises two taper keys. The tow taper keys compose a rectangle and the small face of the rectangle is its operating surface. Torque is transmitted by the pressure between the operating surfaces of the key , shaft and hub. d d 斜度1：100 120? ~130? 在重型机械中常采用切向键----一对楔键组成。 装配时将两楔键楔紧，键的窄面是工作面，所产生的压力沿切向方向分布，当双向传递扭矩时，需要两对切向键分布成120~130 ? 。 窄面 工作面 主要失效形式 The main types of failure： 工作面压溃 Crushing（静联接 Fixed joints） 工作面磨损 Wear（动联接 Sliding joints） 有时：键剪断 shear failure of