机械原理 英汉双语 教学课件 ppt 作者 张春林 Chapter 2 Structural Analysis of Planar Mechanisms
45页1、Chapter 2 Structural Analysis of Planar Mechanisms,1. Link,2.1 Kinematic Chain and Mechanisms,A part is a minimum unit in a machine from the standpoint of manufacture, such as a rigid link, nut, bolt, gear and so on. Fig.2-1a shows a single cylinder four stroke cycle engine, and Fig.2-1b is the schematic diagram. Fig.2-1c is a coupler. The coupler consists of several parts which are connected rigidly.,Fig.2-1 Coupler of the internal combustion engine(内燃机中的连杆),2. Kinematic Pair,(1) Kinematic pair
2、s according to nature of relative motion According to the feature of relative motion between the two links, kinematic pairs may be classified as turning pairs and sliding pairs. 1) Turning pair. When one link has a turning or revolving motion relative to the other link, these two links constitute a turning pair or a revolving pair. ,A kinematic pair is a joint that permits relative motion.,Fig.2-2 Turning pairs(转动副),2) Sliding pair. If two links have a sliding motion relative to each other, they
3、 form a sliding pair or prismatic pair. Fig.2-3 shows some sliding pairs and their symbols.,Fig.2-3 Sliding pairs(移动副),(2) Kinematic pairs according to nature of contact According to the feature of contact between the two links, kinematic pairs may be classified as lower pairs and higher pairs.,1) Lower pair. When a pair has surface or area contact between two links, it is known as a lower pair. 2) Higher pair. When a pair has a point or line contact between two links, it is known as a higher pa
4、ir. ,Fig.2-4 Higher pairs(高副),(3) Kinematic pair element The geometric forms of contact in a pair, such as point, line or surface, are known as pair elements. A pair is made up of two elements, one on each link being joined, such as the outside cylindrical surface of shaft 1 in Fig.2-2 and inner cylindrical surface of bearing 2 in Fig.2-2 are pair elements respectively.。,3. Kinematic Chain,Fig.2-5 Closed kinematic chains(闭链),A kinematic chain is an assembly of links in which the relative motions
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