平面连杆机构之机械经典.pptx

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1、平面连杆机构之机械经典平面连杆机构之机械经典第3章 平面连杆机构131平面连杆机构及其特点平面连杆机构及其特点32平面四杆机构的类型及其应用平面四杆机构的类型及其应用 3-3平面四杆机构的基本知识平面四杆机构的基本知识8-4平面连杆机构的运动设计平面连杆机构的运动设计8-5平面多杆机构平面多杆机构Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2

2、.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第1页/共72页2 2 2 2 连杆机构的特点连杆机构的特点连杆机构的特点连杆机构的特点bb运动副元素简单,制造加工方便。运动副元素简单,制造加工方便。运动副元素简单,制造加工方便。运动副元素简单,制造加工方便。b 可以变换运动,在从动件上实现多种多样的运动。bb还可以实现增力扩大行程锁紧等。还可以实现增力扩大行程锁紧等。还可以实现增力扩大行程锁紧等。还可以实现增力扩大行程锁紧等。bb全部采用低副连接。故为面接触,压强小,易润滑,全部采用低副连接

3、。故为面接触,压强小,易润滑,全部采用低副连接。故为面接触,压强小,易润滑,全部采用低副连接。故为面接触,压强小,易润滑,磨损小,寿命长。磨损小,寿命长。磨损小,寿命长。磨损小,寿命长。Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2

4、011 Aspose Pty Ltd.第2页/共72页完成轨迹要求Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第3页/共72页1.难以平衡其惯性力。因难以平衡其惯性力。因此,限制了它在高速下的

5、使用。此,限制了它在高速下的使用。连杆机构的不足连杆机构的不足连杆机构的不足连杆机构的不足 3.3.运动副间存在间隙,过长的运动链会导致运动副间存在间隙,过长的运动链会导致运动副间存在间隙,过长的运动链会导致运动副间存在间隙,过长的运动链会导致较大的误差累积。较大的误差累积。较大的误差累积。较大的误差累积。2.2.杆数不宜过多(即待定的参数有限),杆数不宜过多(即待定的参数有限),杆数不宜过多(即待定的参数有限),杆数不宜过多(即待定的参数有限),难以精确地满足复杂的运动规律。难以精确地满足复杂的运动规律。难以精确地满足复杂的运动规律。难以精确地满足复杂的运动规律。Evaluation onl

6、y.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第4页/共72页3-2 平面四杆机构的类型及应用 1 1 平面四杆机构的基本形式平面四杆机构的基本形式平面四杆机构的基本形式平面四杆机构的基本形式-铰链四杆机构铰链四杆机构铰链

7、四杆机构铰链四杆机构 基本术语:基本术语:基本术语:基本术语:机架机架机架机架-相对静止的构件相对静止的构件相对静止的构件相对静止的构件l l 连杆连杆连杆连杆-作平面复杂运动作平面复杂运动作平面复杂运动作平面复杂运动l l 连架杆连架杆连架杆连架杆-与机架相连构件与机架相连构件与机架相连构件与机架相连构件 曲柄曲柄曲柄曲柄周转副周转副周转副周转副A A,B B 摇杆摇杆摇杆摇杆摆摆摆摆转副转副转副转副C C,D DEvaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.

8、0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第5页/共72页1.1 曲柄摇杆机构Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profil

9、e 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第6页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 A

10、spose Pty Ltd.第7页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第8页/共72页Evaluation only.Evaluation only.Created with

11、 Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第9页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Asp

12、ose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第10页/共72页1.2 双曲柄机构特点:通过作变速运动的曲柄CD,使往复运动的滑块获得加大的加速度。Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5

13、Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第11页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyrig

14、ht 2004-2011 Aspose Pty Ltd.第12页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第13页/共72页反平行四边形机构Evaluation only.Eval

15、uation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第14页/共72页1.3双摇杆机构Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client

16、 Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第15页/共72页鹤式起重机Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Clie

17、nt Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第16页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2

18、004-2011 Aspose Pty Ltd.第17页/共72页2.平面四杆机构的演化方平面四杆机构的演化方式式l lA A A A 变换不同构件为机架变换不同构件为机架变换不同构件为机架变换不同构件为机架l lB B B B 改变机构的相对尺寸改变机构的相对尺寸改变机构的相对尺寸改变机构的相对尺寸演化方式演化方式 ABC123123变形方式变形方式A A 扩大转动副扩大转动副B B 杆块的对调杆块的对调机构外形的改变对运动无影响机构外形的改变对运动无影响Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.

19、5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第18页/共72页ABCD 14 12 23 341234两构件间相对转角 14,12 0 360 23,34 180(变换机架不影响构件间的相对运动)(变换机架不影响构件间的相对运动)曲柄摇杆机构曲柄摇杆机构 (以(以4构件为机架)构件为机架)双曲柄机构双曲柄机构(以(以1构件为机架

20、)构件为机架)另一个曲柄摇杆机构另一个曲柄摇杆机构(以(以2构件为机架)构件为机架)双摇杆机构双摇杆机构(以(以3构件为机架)构件为机架)Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第19页/

21、共72页四杆机构的演化Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第20页/共72页加大加大CD构件的长度直至构件的长度直至CDBA曲柄摇杆机构曲柄摇杆机构ABC曲柄滑块机构曲柄滑块机构(偏置

22、)偏置)e取不同构件为机架取不同构件为机架曲柄滑块机构(对心)曲柄滑块机构(对心)BAC导杆机构导杆机构摆块机构摆块机构定块机构定块机构Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第21页/共

23、72页曲柄滑块机构曲柄滑块机构曲柄滑块机构曲柄滑块机构BACBACab转动导杆机构(转动导杆机构(ab)BCA定块机构定块机构CAB摆块机构摆块机构摆动导杆机构摆动导杆机构(a b)ab取不同构件为机架取不同构件为机架取不同构件为机架取不同构件为机架Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011

24、 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第22页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第23页/共72页Evalu

25、ation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第24页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5

26、 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第25页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Cl

27、ient Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第26页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright

28、 2004-2011 Aspose Pty Ltd.第27页/共72页ABL 正弦机构正弦机构 S=L*sin SBAC曲柄滑块机构曲柄滑块机构BC杆长增至杆长增至 AB1324变换机架变换机架双转块机构双转块机构(固定(固定2)双滑块机构双滑块机构(固定(固定4)Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2

29、004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第28页/共72页曲柄摇块机构汽车装卸料机构Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose P

30、ty Ltd.第29页/共72页正切机构Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第30页/共72页椭圆仪机构Evaluation only.Evaluation only.Created

31、with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第31页/共72页曲柄摇杆机构曲柄摇杆机构另一个曲柄摇杆机构另一个曲柄摇杆机构曲柄滑块机构曲柄滑块机构(带有一个移动副的四杆机构)(带有一个移动副的四杆机构)正弦机构正弦机构(带有二个移动副的四杆机构)(带有二个移动副的四杆机构

32、)导杆机构(摆动导杆,转动导杆机构)导杆机构(摆动导杆,转动导杆机构)双转块机构双转块机构双滑块机构双滑块机构定块机构定块机构双摇杆机构双摇杆机构双曲柄机构双曲柄机构正切机构正切机构变换机架变换机架改变构件相对长度改变构件相对长度摆块机构摆块机构四杆机构的演化Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004

33、-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第32页/共72页3-3 四杆机构的基本知识四杆机构的基本知识本小节要点本小节要点1.铰链四杆机构曲柄存在条件及类型的判别铰链四杆机构曲柄存在条件及类型的判别2.急回运动和行程速比系数急回运动和行程速比系数3.四杆机构的压力角传动角及死点问题四杆机构的压力角传动角及死点问题Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with

34、Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第33页/共72页1 1 1 1 铰链四杆机构曲柄存在条件铰链四杆机构曲柄存在条件铰链四杆机构曲柄存在条件铰链四杆机构曲柄存在条件Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Sl

35、ides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第34页/共72页曲柄存在的直观几何条件:曲柄存在的直观几何条件:在任何位置在任何位置 BCD存在存在,即即b+cfb-ca 可可得得:d+a b+c;d+b a+c;d+c a+d;f1 1 铰链四杆机构曲柄存在条件铰链四杆机构曲柄存在条件铰链四杆机构曲柄存在条件铰链四杆机构曲柄存在条件ABCDabcdaba Ca ddad bdCEvaluation only.Evalua

36、tion only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第35页/共72页Lmax L1+L2+L3结论结论 铰链四杆机构曲柄存在的条件式:铰链四杆机构曲柄存在的条件式:1)最短杆加最长杆小于等于其它两杆长度之和。)最短杆加最长杆小于等于其它两杆长

37、度之和。2)最短杆出现在于机架或连架杆之中。)最短杆出现在于机架或连架杆之中。铰链四杆机构类型的判定:铰链四杆机构类型的判定:Lmin+Lmax L1+L2考考察察机机架架固定最短杆固定最短杆双曲柄机构双曲柄机构固定最短杆邻边固定最短杆邻边曲柄摇杆机构曲柄摇杆机构固定最短杆对边固定最短杆对边双摇杆机构双摇杆机构可能有曲柄存在可能有曲柄存在Y没有曲柄存在没有曲柄存在NY不不能能成成为为机机构构NEvaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created

38、with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第36页/共72页例题例题 已知:已知:a =240 mm;b =600 mm;c =400 mm;d =500 mm。(1)当取杆当取杆 4为机架时,是否有曲柄存在?为机架时,是否有曲柄存在?有曲柄有曲柄存在存在 曲柄摇杆曲柄摇杆机构机构 (2)若各村长度不变,能否以选不同杆为机架)若各村长度不变,能否以选不同杆为机架的办法获得双曲柄机构和双播杆机

39、构?如何获得?的办法获得双曲柄机构和双播杆机构?如何获得?AB为机架为机架 双曲柄双曲柄机构机构CD为机架为机架 双摇杆双摇杆机构机构Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第37页/共7

40、2页(1)当取杆当取杆 4为机架时,是否有曲柄存在?为机架时,是否有曲柄存在?有曲柄有曲柄存在存在 曲柄摇杆曲柄摇杆机构机构 (2)若各村长度不变,能否以选不同杆为机架)若各村长度不变,能否以选不同杆为机架的办法获得双曲柄机构和双摇杆机构?如何获得?的办法获得双曲柄机构和双摇杆机构?如何获得?AB为机架为机架 双曲柄双曲柄机构机构CD为机架为机架 双摇杆双摇杆机构机构(3)若)若a、b、c三杆的长度不变,取杆三杆的长度不变,取杆4为机架,要获得曲柄摇杆机构,为机架,要获得曲柄摇杆机构,d的取值范围应为何值?的取值范围应为何值?分析:分析:a 必须最小必须最小 d FVamin=ABCDabcd

41、 min=arc cos b2+c2-(d-a)22 b c max=arc cos b2+c2-(d+a)22 b c;FVmax 3 3 压力角、传动角及死点位置压力角、传动角及死点位置压力角、传动角及死点位置压力角、传动角及死点位置结论:结论:曲柄摇杆机构中,以曲柄摇杆机构中,以曲柄为原动件时曲柄为原动件时最小传动角必出现在最小传动角必出现在曲柄与机架拉直或重叠共线两位置之中。曲柄与机架拉直或重叠共线两位置之中。Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2

42、.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第42页/共72页Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.

43、0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第43页/共72页机构的死点位置机构的死点位置机构的死点位置机构的死点位置 当机构中含有往复运动构件并以此为原动件时,机构运动中往往会出现当机构中含有往复运动构件并以此为原动件时,机构运动中往往会出现 =0(传动角等于零的位置),即死点位置。传动角等于零的位置),即死点位置。BCA内燃机中的曲柄滑块机构内燃机中的曲柄滑块机构另外可利用死点位置实现机构中某构件的可靠定位。另外可利用死点位置实现机构中某构件的可靠定位。(如夹具设计飞机起落架设计等)(如夹具

44、设计飞机起落架设计等)使机构闯过死点的方法;惯性法和辅助机构法。使机构闯过死点的方法;惯性法和辅助机构法。C1AB1D缝纫机脚踏板机构缝纫机脚踏板机构C2B2C2B2B1C1Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 As

45、pose Pty Ltd.第44页/共72页机车联动机构Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第45页/共72页飞机起落架Evaluation only.Evaluation only.

46、Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第46页/共72页夹具Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.C

47、reated with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第47页/共72页1)满足预定的运动规律要求满足预定的运动规律要求2)满足预定的连杆位置要求(刚体导向)满足预定的连杆位置要求(刚体导向)3)实现预定的轨迹实现预定的轨迹其它辅助条件;压力角大小,急回特性,曲柄存在否,杆长比等。其它辅助条件;压力角大小,急回特性,曲柄存在否,杆长比等。解析法解析法 图解法图解法 实验法实验法1 连杆机构

48、设计的基本问题连杆机构设计的基本问题方法3-4 3-4 平面连杆机构的设计平面连杆机构的设计平面连杆机构的设计平面连杆机构的设计(综合)(综合)(综合)(综合)Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pt

49、y Ltd.第48页/共72页1)按给定刚体位置设计四杆机构如图给定刚体三位置b12b23c12c23AD已知动铰链 求定铰链(垂直平分线交点)B1C1B2C2B3C2用作图法设计四杆机构用作图法设计四杆机构用作图法设计四杆机构用作图法设计四杆机构Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011

50、Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.第49页/共72页用变化机架法(反转法)作问题的转化给定刚体三位置和机架位置B1C1 B2 C2B3 C3 AD 保持刚体与机架的相对位置不变,实施反转。Evaluation only.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-20

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