Power-cam mechanism has a very high mechanical efficiency. It has very little sliding friction. Please read the post https://www.linkedin.com/pulse/power-cam-mechanism-jing-yuan-zhou .
Cam Mechanism a mechanism that usually consists of two moving parts (a cam and tappet) and a fixedpart (the support). Cam mechanisms produce almost any type of motion of the drivenelement (the tappet) with continuous motion of the drive element (the cam). To reproducea complex path of motion of the working units, such as in knitting machines, two camstransmit motion to the tappet. Cam mechanisms are compact and may be easily introduced into the general scheme ofa machine. Some of their drawbacks are heavy wear in the double-action kinematic pairand a tendency toward disconnection at high speeds. To reduce wear, the elements of acam mechanism are made of high-quality steel and then are tempered and carefullyworked. Loss of contact between the cam and the tappet is prevented by forcibleconnection of the pair, using springs that constantly press the tappet to the cam, orgeometrical fastening, in which the cam or tappet is given a shape that makes impossibleseparation of the tappet from the cam (for example, the cam is constructed with a grooveinto which the tappet roller fits). Cam mechanisms are used in various areas of machine building, such as internal-combustion engines, metal-cutting machines, and machines of the food industry, in whichthe cam mechanism performs a programmed operation, as well as in automatedmachines, in which cam mechanisms perform control functions, connecting anddisconnecting working parts at the proper moment
