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

US5649748A · 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 7, 1995
• Grant date: Jul 22, 1997
• Expiry date: Jun 7, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T8/5025
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

[The aim is to] A solenoid valve which achieves a setting of a reduced flow area which is active after a closed position of the valve is disclosed. The solenoid valve has a seat valve in a valve chamber. A magnet armature for actuating the seat valve is provided on its end face remote from the seat valve with an axially expandable hollow part whose interior, acting as a control chamber, is connected to a valve sub chamber through a pressure fluid channel. A [D]dynamic pressure is generated in the partly open position of the seat valve in the valve subchamber and is capable through expansion of the hollow part in the control chamber of causing a force which acts on the magnet armature against the force of a resetting spring and on the basis of which the seat valve maintains its partly open position. The valve can be used in slip-controlled hydraulic brake systems of motor vehicles.