Magnetic valve for fluid control

US4690374A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wilhelm Polach · Asperg, DE
• Helmut Rembold · Stuttgart, DE

Key dates

• Filing date: Nov 26, 1985
• Grant date: Sep 1, 1987
• Expiry date: Nov 26, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S239/90
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A magnetic valve used for fluid control includes a valve housing, having a magnetic coil surrounding a core, and an armature, which is joined to a valve closing element which cooperates with a fixed valve seat. An end on which a collar is embodied, the valve closing element protrudes into an interior of a spring housing, which is slidably disposed counter to the force of a counterspring. A first bent end of an angle element is supported on a cover of the spring housing, while a second bent end grips the collar from behind and protrudes through a bottom opening of the spring housing. In the open position of the valve closing element, the second bent end is spaced apart from the collar by a distance a. In the valve closing element there is a compensation bore leading to the interior of the spring housing. After actuation of the magnetic coil, the armature displaces the valve closing element toward the valve seat counter to the force of the restoring spring. Only with a delay does a fluid pressure build up in the interior which displaces the spring housing toward the housing stop, thereby stressing a supplementary spring. When the magnetic coil excitation is interrupted, the forces of…