Patent ID: 7090477

Claim:
An electromagnetic coaxial driving injection apparatus, comprising: an injection screw; a linear injection driving device, comprising a linear motor, with a linear stationary part, and a linear moving part interior of said linear stationary part, being rotatable within said linear stationary part, and having a common axis with said injector screw, for driving said injection screw in a linear movement along a main axis thereof; a metering driving device, comprising a rotary motor having a stator with transversal field coils, and a rotor, interior of said stator, having a shaft coaxial with and connected to said injector screw, said rotor being linearly moveable in an axial direction relative to said stator, driving said injection screw in a rotating movement for metering; and a connecting unit, connecting said linear moving part of said linear driving device and said rotor of said metering driving device; wherein said linear moving part and said rotor together with said injector screw, perform said linear and rotating movements against said stationary parts.