Injection unit comprising a spindle drive and hydraulic support
US7306447B2 · kind B2 · utility
1Cited by
5References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 10, 2004 |
| Grant date | Dec 11, 2007 |
| Priority date | — |
| Expiry date | Nov 30, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/7716
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is an injection unit (1) for an injection molding machine, comprising a screw (4) that is driven by means of a spindle drive (18). The spindle drive (18) is driven via an electric motor (6). Additionally, a force that acts in an axial direction is transmitted to the screw of the injection unit (1) via a hydraulic cylinder (38). According to the invention, a pump (48, 68) is driven via the electric motor (6). A pressure chamber (44) of the cylinder (38) can be supplied with more pressurizing means via said pump (48, 68) than is needed during an axial displacement of the plunger (36).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.