Electric drive with hydraulic assist in an injection molding machine
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United States of America Patent
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May 5, 1998
Grant Date -
N/A
app pub date -
Aug 30, 1996
filing date -
Sep 1, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An electric drive with hydraulic assist is disclosed for use in an injection molding machine, especially for screw advance during the injection process and/or in the dwell pressure phase. An electric motor is primarily used to produce the axial advance of the injection screw via an appropriate gear train. A piston that is moveable in a cylinder through pressure provided by a hydraulic fluid reservoir, can be used to supplement the axial movement produced by the electric motor. It is proposed according to the invention that pressurization occurs via the hydraulic fluid reservoir upon reaching a defined control quantity which corresponds to a defined load condition on the electric motor, such that the pressure rise in the cylinder is proportional to the load on the electric motor.
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