Patent · US Expired

Electromagnetic adjusting device

US6556113B2 · kind B2 · utility

3Cited by

1References

13Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Christiane Ketschau · Cologne, DE
Markus Deeg · Eberdingen, DE
Lothar Pfeiffer · Freiberg, DE

Key dates

Filing date	Jan 17, 2002
Grant date	Apr 29, 2003
Priority date	—
Expiry date	Jan 17, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH01F7/081
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electromagnetic adjusting device for automatic transmissions of motor vehicles has an electromagnet having a magnetic coil, a substantially cup-shaped housing which surrounds the magnetic coil and is composed of a ferromagnetic material, the housing having a housing bottom, a ferromagnetic central part which extends from the housing bottom and supports the magnetic coil, and a movable armature located before the central part and leaving a working air gap so as to form with the housing and the central part a magnetic circuit which has a magnetic resistance for a magnetic flux, and means for changing the magnetic resistance, the means for changing the magnetic resistance including an axial depression provided in the central part and an axially displaceable ferromagnetic filling member inserted in the depression and limiting with a bottom of the depression an auxiliary air gap.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.