Valve unit for an electro-pneumatic brake control device for controlling a parking brake

US8794718B2 · kind B2 · utility

Assignee

• WABCO GmbH · DE

Inventors

• Uwe Bensch · Hannover, DE
• Jörg Helmer · Weingarten, DE
• Reiner Hölscher · Seelze, DE
• Bernd-Joachim Kiel · Wunstorf, DE
• Wilfried Menze · Springe, DE
• Juan Rovira-Rifaterra · Garbsen, DE

Key dates

• Filing date: Jul 4, 2007
• Grant date: Aug 5, 2014
• Expiry date: Aug 21, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/87233
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A valve unit for an electro-pneumatic brake control is connected to an input of an air-quantity-boosting valve for the aeration/venting thereof. A double-armature solenoid valve includes primary and secondary armatures each spring-loaded and actuated by a common magnet coil. The primary armature is a switch for a vent valve; the secondary armature is a switch for an intake valve. When the coil is not drawing current, the armatures are in spring-loaded position, the intake valve blocking intake and the vent valve venting. When a first current flows through the coil, the primary armature enters switching position, with the secondary armature in spring-loaded position; the intake valve blocking intake and the vent valve blocking venting. When a second current greater than the first flows through the coil, both primary and secondary armatures are moved into switching positions, so that the intake valve admits air and the vent valve blocks venting.