An actuator that performs mechanical work by regulating the air
pressure in a rubber chamber.
An example of pneumatic rubber-actuator has a rubber cylinder
covered with a sleeve made of twisted synthetic fiber cord woven into net form with both ends of the
cylinder fixed to metallic members. When the rubber cylinder is pressurized, the cylinder expands
diametrally and contracts axially, thus enabling mechanical work to be performed. Compared to other
types of actuators of the same size, the pneumatic rubber-actuator has a smaller stroke but is
lightweight and can produce a large force. This type of actuator has been experimentally applied to
the feet of microrobots to produce a hexapedal walking motion, and to the drive mechanism to produce
a human muscular-skeletal mimetic motion system.