Actuator for intake manifold

An actuator for an intake manifold, which rotates a variable valve arranged in a runner of an intake manifold of a vehicle so as to variably change an air intake path in the runner, the actuator comprising:

• a housing having a negative pressure space in which negative pressure is formed;
• an operating unit operated by the pressure of air introduced into and discharged from the negative pressure space, and rotating the variable valve;
• an exhaust flow path formed at one side of the housing, and connected to an external negative pressure supply source through an exhaust pipe such that negative pressure is formed in the negative pressure space;
• an intake flow path formed in the housing, and receiving external air which raises the pressure of the negative pressure space;
• a spool hole formed in the housing so as to communicate with the exhaust flow path and the intake flow path, and housing a valve body therein;
• an air entry and exit flow path formed in the housing so as to communicate with the negative pressure space and the spool hole;
• a valve body slidably installed in the spool hole, and selectively opening/closing the exhaust flow path and the intake flow path;
• and
• a solenoid unit operating the valve body.