Magnet valve with pressure limitation for slip-controlled motor vehicle brake systems

US6086164A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Oehler · Leingarten, DE
• Guenther Hohl · Stuttgart, DE
• Hans-Peter Huebner · Stuttgart, DE
• Norbert Mittwollen · Markgröningen, DE

Key dates

• Filing date: Apr 28, 1997
• Grant date: Jul 11, 2000
• Expiry date: Apr 28, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S303/901
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A magnet valve with low noise upon shutoff from the pressure limiting function. The magnet valve has a two-part valve tappet, whose inner valve tappet part has the closing member of a seat valve. The closing member is circumferentially engaged in spaced-apart fashion, forming a gap space, by a tubular portion of the outer valve tappet part. From the gap space, a pressure fluid conduit leads to a control chamber, which is located between the face end, remote from the seat valve, of a magnet armature that cooperates with the valve tappet, and a valve dome. Upon shutoff of the magnet valve, the seat valve changes from its closing position to a partly open position, in which dynamic pressure in the gap space becomes operative and is transmitted through the pressure fluid conduit into the control chamber. The hydraulic force that is operative there on the magnet armature acts counter to the opening forces of the magnet valve and slows down its opening motion. Because of the thus-throttled flow of pressure fluid through the seat valve, a pressure surge is averted. The magnet valve can be used in slip-controlled motor vehicle brake systems.