2连杆机构的特点(tèdiǎn)完成轨迹(guǐjì)要求1.难以平衡其惯性力。因此，限制(xiànzhì)了它在高速下的使用。§3-2平面四杆机构的类型(lèixíng)及应用1.1曲柄(qūbǐng)摇杆机构Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.1.2双曲柄(qūbǐng)机构Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.反平行四边形机构(jīgòu)1.3双摇杆机构(jīgòu)鹤式起重机Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.2.平面四杆机构的演化(yǎnhuà)方式四杆机构(jīgòu)的演化曲柄(qūbǐng)滑块机构Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.曲柄(qūbǐng)摇块机构－汽车装卸料机构正切(zhèngqiē)机构椭圆(tuǒyuán)仪机构曲柄(qūbǐng)摇杆机构1铰链四杆机构(jīgòu)曲柄存在条件曲柄存在的直观几何条件：在任何位置BCD存在,即b+c>fb-c<f例题(lìtí)已知：a=240mm；b=600mm；c=400mm；d=500mm。（1）当取杆4为机架时，是否(shìfǒu)有曲柄存在？曲柄(qūbǐng)摇杆机构的急回特性曲柄(qūbǐng)摇杆机构的急回其它(qítā)机构的急回特性铰链四杆机构(jīgòu)压力角a和传动角压力角a=FVa+=90oEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.机构(jīgòu)的死点位置机车联动(liándònɡ)机构飞机(fēijī)起落架夹具(jiājù)1)满足预定的运动规律(guīlǜ)要求1）按给定刚体(gāngtǐ)位置设计四杆机构用变化机架法（反转法）作问题(wèntí)的转化用变化(biànhuà)机架法（反转法）作问题的转化3）按给定行程速比系数设计(shèjì)四杆机构偏