Double Dance Course Presentation

    A cam mechanism is a high-leverage mechanism composed of three basic components: a cam, a follower, and a frame. The cam is a component with a curved profile or a groove and is usually the active part, rotating at a constant speed or moving in a linear recursive manner.
 A mechanism driven by the rotation, movement, or reciprocating movement of a cam to move the actuated member in a prescribed reciprocating or oscillating motion. The cam has a curved profile or groove, including disc-shaped, cylindrical, and moving cams, among which the cylindrical cam's groove curve is a spatial curve, thus belonging to a spatial cam. The actuated member makes point contact or line contact with the cam, including roller actuated members, flat-bottom actuated members, and tip-end actuated members, etc. The tip-end actuated member can maintain contact with any complex cam profile, enabling any movement, but the tip is prone to wear and is suitable for low-speed mechanisms with small force transmission. To maintain contact between the actuated member and the cam, spring or additional force can be applied. A cam with a groove can ensure that the actuated member transmits a definite motion, which is a type of definite motion cam. In general, the cam is the active element, but there are also passive or fixed cams. Most cams have a single degree of freedom, but there are also double-degree-of-freedom split conical cams. Cam mechanisms are compact in structure and are suitable for applications requiring the actuated member to make intermittent movements. Compared with similar mechanisms in hydraulic and pneumatic, cam mechanisms are reliable in movement, and therefore are widely used in automatic machines, internal combustion engines, printing machines, and textile machines. However, cam mechanisms are prone to wear and have noise. The design of high-speed cams is relatively complex, and manufacturing requirements are high.

Working Principle:
 It bears the force transmitted by the connecting rod and converts it into torque to output through the crankshaft, driving other attachments on the engine to work. The crankshaft is subjected to the combined effects of centrifugal forces from the rotating mass, periodic changes in gas inertia forces, and recoil inertia forces, making the crankshaft bear the action of bending and torsional loads.

Experiment Report:

 The structure is simple, compact, and convenient to design, so it is widely used in machine tools, textile machinery, light industry machinery, printing machinery, and the integration of mechanical and electrical equipment assembly. As long as an appropriate cam profile is made, the driven rod can obtain any predetermined motion law.