Drive apparatus, press machine slide drive apparatus and method thereof
US6647870B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 2001 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | Dec 29, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B15/14
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.