Barrier valve with pressure limiting function in particular for slip-controlled hydraulic brake systems of motor vehicles

US6250725A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Guenther Schnalzger · Blaichach, DE
• Peter Zimmermann · Munich, DE
• Robert Mueller · Roth, DE

Key dates

• Filing date: Nov 9, 2000
• Grant date: Jun 26, 2001
• Expiry date: Nov 9, 2020

Classification

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

Abstract

A barrier valve including an armature, longitudinally movable toward a pole core by excitation of an electrical winding. A prestressed compression spring in a longitudinal bore of the armature, as well as a support body, loaded by the compression spring, that is braced on a shoulder of the bore. The barrier valve furthermore has a tappet, which engages the support body and is movable relative to the armature and carries a closing body of a seat valve. When the winding is excited, the closing body is movable, overcoming the valve stroke, toward a valve seat of the seat valve. When the winding is excited, the closing body can be lifted from the valve seat by hydraulic forces acting on the closing body toward the valve seat, counter to the spring force of the compression spring in the armature. The stroke of the tappet relative to the armature engaging the pole core is limited to an amount less than the valve stroke. The barrier valve can be used in slip-controlled hydraulic brake systems and is distinguished by low noise when the pressure limiting function becomes operative.