Electromagnetic driving device, fluid control valve having same and method of manufacturing same
US6601822B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2001 |
| Grant date | Aug 5, 2003 |
| Priority date | — |
| Expiry date | Apr 16, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8671
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a magnetic driving device, a fixed core has a housing portion, in which a plunger is housed to reciprocatingly move, and an attracting portion toward which the plunger is attracted upon energizing a coil. The housing portion is provided with a ring portion, which is formed by machining an outer circumference wall thereof and whose thickness is thinner than that of a part of the housing portion adjacent to the ring portion to an extent that mechanical strength of the housing portion is not damaged. The ring portion is provided with a plurality of through-holes penetrating radially the wall thereof. A magnetic flux area of the ring portion is limited due to the thin wall and the through-holes so that magnetic resistance is enlarged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.