Brake valve infinitely variable pressure intensification

US4706545A · kind A · utility

Assignee

• Mannesmann Rexroth AG · DE

Inventors

• Dietmar Gossl · Gössenheim, DE
• Ludwig Muncke · Lohr am Main, DE
• Kurt Wittich · Bad Hersfeld, DE

Key dates

• Filing date: Oct 16, 1985
• Grant date: Nov 17, 1987
• Expiry date: Oct 16, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/2409
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

In a brake valve of the type in which a given ratio is maintained between a master pressure developed by a brake pedal and an actual brake pressure, an arrangement is provided for continuous, rather than stepwise, adjustment of this ratio. The brake valve includes a control piston which is subjected to the master pressure and which, by the displacement thereof, opens and closes connecting channels between an accumulator containing a primary pressure fluid and a brake, as well as between the brake and a fluid collecting tank. The control piston and a measurement piston apply counter forces to the arms of a balance beam whose lever ratio determines the degree of feedback of the instantaneous brake pressure to the control piston. A stop is provided in the path of the axis of the control piston, which limits the stroke of the piston, to prevent the overloading of the balance beam during abnormally high braking pressures such as occur, for instance, during panic braking.