Electromagnet, particularly a proportional magnet for operating a hydraulic valve
US6313726A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1999 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Sep 1, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/17
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electromagnet (1), particularly a proportional magnet for operating a hydraulic valve, said electromagnet (1) comprising at least one coil winding (3) carried by a hollow cylindrical coil spool (2) which is circumferentially surrounded by a hollow cylindrical magnet housing (4) and limited at each end by a pole shoe (5, 6), said electromagnet (1) further comprising an axially moveable cylindrical armature (8) which is arranged in a hollow cylinder of the coil spool (2) that is configured as an armature space (7), the armature (8) being mounted for low friction in rotary, longitudinally moveable axial guides, and electromagnetically produced axial movements of the armature (8) can be transmitted to a hydraulic valve piston via a push rod (10) which is connected to the armature (8) to form an axial extension thereof. According to the invention, the rotary, longitudinally moveable axial guides of the armature (8) comprise at least one bushing-less linear ball bearing having a number of circumferentially spaced balls while being configured at the same time as an anti-stick means of the armature. The outer peripheral surface (9) of the armature (8) and/or the outer peripheral surface…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.