机械原理 英汉双语 教学课件 ppt 作者 张春林 Chapter 5 Synthesis of Planar Linkages
40页1、Chapter 5 Synthesis of Planar Linkages,1.The Characteristics of Planar Linkages,1) A linkage has a simple structure and it is easy to manufacture, so it has a low cost. 2) The pressure in a lower pair with surface contact is lower, so the linkage has a large load capacity. 3) A linkage can achieve various motions by designing its dimensions of the links. 4) A linkage can transmit motion within a long distance. 5) It is difficult to perform precision motion; this is a disadvantage of linkages.,5.
2、1 Characteristics and Types of Planar Linkages,Fig.5-1 Types of four-bar linkages(铰链四杆机构的类型),2.Types of Planar Linkages,Fig.5-2 Types of four-bar linkages with a sliding pair(含有一个移动副的四杆机构类型),(1) Crank rocker linkage If a four bar linkage shown in Fig 5-1a is designed so that link 1 can rotate continuously while link 3 only oscillates through an angle, it is called a crank rocker linkage. (2) Double crank linkage Both link 2 and link 4 in Fig 5-1b can rotate continuously relative to the frame 1;
3、this linkage is called a double crank linkage. (3) Double rocker linkage Both link 2 and link 4 in Fig 5-1c can not rotate completely relative to the frame 3; this linkage is called a double rocker linkage. (4) Parallel crank four bar linkage If in a four bar linkage, two opposite links are parallel and equal in length, as shown in Fig 5-1d, cranks 2 and 4 always have the same angular velocity. This mechanism is called a parallel crank four bar linkage. It is widely used, such as in the coupling
4、 of locomotive wheels, in pantograph, etc. (5) Isosceles trapezium linkage If two rockers of a double rocker linkage are equal in length, see the Fig 5-1e, this linkage is called an isosceles trapezium linkage; it can be used in the steering mechanism in automobiles.,(6) Slider crank linkage This linkage is shown in Fig 5-2a, in which side link 1 is a crank, and the other side link 3 is a slider. Turning pairs A and B are full turning pairs, and C is oscillating turning pair. (7) Rotating guide
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