Double-action piston that has a smaller area A R on the rear. Pressure on the piston area A K generates the piston force and pressure on the annular area A R (in (Figure D 21)) generates a counteracting return force F R. The smaller part of the piston is termed the "piston rod".
![c9e9af29fa5a50c93c1df49c917fc672be037043 0001_differentialkolben.gif](/fileadmin/smc/files/c9e9af29fa5a50c93c1df49c917fc672be037043.gif)
Figure D 21: Differential cylinder