Drive apparatus, press machine slide drive apparatus and method thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 18, 2003
Grant Date -
Jul 25, 2002
app pub date -
Nov 28, 2001
filing date -
Dec 5, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric motor and hydraulic pump/motor are combined on a torque level, a press machine is controlled with controllability of an electric motor, and kinetic energy of a slide is regenerated during braking without constraints of slide pressurization or an amount of energy. A screw press drives a slide through a screw mechanism made up of a drive nut and a driven screw. The drive nut is provided with a ring gear integral therewith and this ring gear is engaged with a gear provided for a drive axis of an electric motor and a gear provided for the drive axis of a hydraulic pump/motor. The hydraulic pump/motor is connected to a constant high pressure source that generates a quasi-constant pressure hydraulic liquid and a low pressure source. This allows the electric motor and hydraulic pump/motor to be combined on a torque level.
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