Patent ID: 8448446

Claim:
An actuating device for a turbojet engine with a bypass air bleed system and a bypass air bleed shutter, the actuating device comprising: a mechanism that includes a piston which translates between a first position and a second position, and a crank which rotates about an axle based on translational displacement of the piston; the bypass air bleed shutter connected to the crank; at least one actuator attached at one end to an end of the piston and made of a shape memory alloy, wherein the actuator is a two-way actuator having a first stable state at a first temperature, in which state the actuator actuates either opening or closing of the shutter by moving the piston to the first position, and a second stable state at a second temperature in which state the actuator actuates the other one of the closing or opening of said shutter by moving the piston to the second position, respectively, and temperature regulating means for bringing the shape memory alloy actuator to the first temperature or to the second temperature, the regulating means comprising a regulating valve, a connecting pipe connected to the regulating valve, a first feed pipe connected to a first source of a fluid brought to the first temperature, and a second feed pipe connected to a second source of a fluid brought to the second temperature, the first and second feed pipes being connected to the regulating valve.