Determination of kinematic parameters of spatial articulated crank-slide mechanism by projectionmethod

Crank-slide four-link lever mechanism serves to convert one type of rotary motion into another translational motion. This mechanism is one of the most common, it is the main mechanism in piston machines (internal combustion engines, compressors, pumps). Recently, work has been underway to introduce spatial crank-slider mechanisms in different machines in which the crank rotates in one plane and the slider moves in a straight line crossing this plane at some angle. Mechanisms of this type are going to be introduced in different piston and sewing machines in order to make them as compact as possible. In these mechanisms, the movable joints are cylindrical and spherical hinges, the connecting rod in this case has free rotation around its longitudinal axis and this gives the mechanism an additional second degree of freedom in place of one. This paper describes a method of kinematic analysis of spatial articulated mechanisms that is convenient for practical use.This method is based on the projection of the calculated spatial scheme of the studied roping mechanism onto the orthogonal system of projection planes used in descriptive geometry. Using this method, you can plot the velocities and accelerations of any kind of spatial linkage.