Electromagnetically actuated valve for slip-controlled hydraulic brake systems in motor vehicles

US5630569A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Oehler · Leingarten, DE
• Guenther Hohl · Stuttgart, DE
• Norbert Mittwollen · Markgröningen, DE
• Hans-Juergen Herderich · Weingarten, DE
• Stephan Jonas · Gerlingen, DE

Key dates

• Filing date: Jun 5, 1995
• Grant date: May 20, 1997
• Expiry date: Jun 5, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/87217
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

An electromagnetically actuated valve which achieves the setting of a reduced cross section of flow following a closed position of the valve. The solenoid valve has a seat valve which is surrounded by a sleeve which is secured pressure-tightly on a valve body. In the closed position of the seat valve, a tappet engages in the sleeve, forming a small radial gap. From the interior of the sleeve, a first pressure-medium passage leads to an end face of a magnet armature, said end face being remote from the seat valve. Outside the sleeve, a second pressure-medium passage leads to that end face of the magnet armature which is close to the seat valve. In the case of a pressure drop between the pressure-medium inlet and the pressure-medium outlet of the solenoid valve, the seat valve can assume a partially open position following a closed position of said valve since, due to the gap, which acts as a restriction, a pressure disequilibrium arises at the magnet armature and valve opening forces are compensated. The valve can be employed in slip-controlled hydraulic brake systems of motor vehicles.