Injection unit
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United States of America Patent
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Oct 12, 2010
Grant Date -
Oct 30, 2008
app pub date -
Feb 24, 2006
filing date -
May 24, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is directed to an injection unit, in particular for an injection molding machine, comprising a screw which is guided in a plastication cylinder in a rotatable and axially movable manner and via which plastic material undergoes plastication and can be injected into a tool cavity. The screw is driven via an electric drive including an electric motor and is operatively connected to a support cylinder having a pressure chamber to which dynamic and/or support pressure can be applied during plastication and injection. The electric motor is coupled to a hydrostatic machine which during plastication is driven by the pressure medium displaced from the pressure chamber and which during injection conveys pressure medium into the pressure chamber so as to build up support pressure.
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