Electromagnetic hydraulic valve

US6328065A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Schmid · Heidenheim, DE
• Raymond Schuurman · Schwieberdingen, DE
• Christof Ott · Asperg, DE

Key dates

• Filing date: Sep 9, 1999
• Grant date: Dec 11, 2001
• Expiry date: Sep 9, 2019

Classification

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

Abstract

In a proposed electromagnetic pressure regulating valve (10, 10a), the functional characteristics of a pressure regulating valve are combined with those of a switching valve. The pressure regulating valve (10, 10a) can be used in particular to control automatic transmissions in motor vehicles and is characterized by reduced manufacturing costs, reduced leakage and an operating range which is expanded for reduced operating pressures and with a continuous characteristic line. For this purpose, the valve part (11, 11a) of the pressure regulating valve (10, 10a) has a first seat valve (45) with a closing element (34). This closing element (34) cooperates with an actuating element (35, 35a) which has a control edge (50) to form a second seat valve (49).