Ball screw device and injection molding machine incorporating the same
US6814558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2002 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | Oct 19, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18592
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a ball screw device for linear movement, which moves a working body by using a single of a plurality of ball screw shafts and ball screw nuts. In the ball screw device, a plurality of ball screw nuts are engaged threadedly with the same ball screw shaft. Also, one of the ball screw nuts on each ball screw shaft is attached to the working body via a fixed flange, the single fixed flange or one of the fixed flanges is provided with a load sensor, and other ball screw nuts serve as a fluid pressure supporting mechanism using a cylinder and a piston. A fluid pressure is controlled so that the support force of the fluid pressure supporting mechanism is equal to the pushing force detected by the load sensor. By this configuration, a large load can be distributed evenly to the ball screw nuts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.