机构创新设计实例（An example of institutional innovation design）.docVIP

机构创新设计实例（An example of institutional innovation design） Chapter vii institutional innovation design The first section is the same trajectory linkage mechanism The development of a new type of internal combustion engine Section 3 innovation design of coupling The principle of the fourth section is innovative design Section 5 mechanical structure design of overload protection device The instance The first section is the same trajectory linkage mechanism Trajectory four bar linkage is refers to the degree of freedom with the same input motion components and f, output component on the same set of linkage locus of a point, but this group of linkage kinematics size is different, so the stress state, dynamic performance has a huge difference. Therefore, the formation method of the same trajectory linkage mechanism is one of the important methods of institutional innovation design. The Robert chebeschoff theorem for the formation of the same locus is the American mathematician, sumer. It was discovered in 1875 by Robert, a Russian scholar, in 1878. It was called Robert chibechevs theorem. The content of this theorem is that a link curve of a four-bar hinge mechanism can also be produced by two other four hinged mechanisms. The same link curve can be expressed in three different mechanisms. 1. Link point k is located in the link connecting rod linkage The graphical scaling principle is shown in FIG. 7-1a as a parallelogram mechanism, which is articulated by the parallelogram obkd and the rack at o point. A point is a point on the bk extension cord. I have to connect the ao to the c. When a point moves along any given trajectory, c will give a similar but smaller trajectory to a. The value of ao over co and ab over KB is equal to the constant m (ray theorem). The ratio of aa to cc is equal to the constant m of the ratio of aa to cc by the ray theorem. Everything in point a is the synthesis of these two parts. Therefore, the movement of c points is to simulate the motion of a