Leveling system for vehicles

US5261691A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Laichinger · Großenhain, DE
• Martin Scheffel · Leinfelden, DE

Key dates

• Filing date: May 14, 1992
• Grant date: Nov 16, 1993
• Expiry date: May 14, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60G2800/914
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A leveling system for motor vehicles, having two work actuators each assigned to one vehicle axle, between a respective wheel suspension in the vehicle body and having a proportional pressure control valve associated with each actuator. The pressure control valves have three switching positions for alternatingly connecting the pressure chambers of the associated actuators to a pressure fluid source and a pressure fluid tank, and for blocking off the pressure chambers. To prevent unstable driving conditions if the leveling system should fail, it is assured by structural provisions that in the pressure chamber blocking phase of the two actuators their two pressure chambers communicate with one another via a throttle. As a result, greatly different pressures in the two actuators at the moment they are blocked can be equalized, so that the unstable behavior of the vehicle is avoided. The throttle restriction is provided in pressure-tight seat valves which are incorporated between the proportional pressure control valves and the actuators.