Figure 8.29 illustrates the working principle of a forward and reverse expansible
gas vane motor. The expansion ratio of the expanded vane motor is 2:6 : 1. When
gas (or compressed air) enters the motor from A or B inlet, the working state of
counter-clockwise rotation or clockwise rotation can be obtained.
If the rotation angle of the output shaft of the actuator is required to be 360°
*720°, and the control load moment is not very large, and the rotation speed is
relatively low, a spiral spline shaft swing pneumatic motor can be used. Figure 8.30
shows the basic structure of the swing pneumatic motor.
Exhaust hole (reversed as inlet hole)
Inlet hole (reversed as exhaust hole)
Output Shaft valve
Gear
Fig. 8.28 Pneumatic gear motor
Rotor
Blade
Housing
Inlet (reverse turn)
Output Shaft
Inlet (positive turn)
Exhaust
Fig. 8.29 Operating principle of forward and reverse blade pneumatic motor
8.2 Structure and Characteristics of Actuators
37