Load sensing system with increasing priority in series of control valves

US4966066A · kind A · utility

Assignee

• Mannesmann Rexroth AG · DE

Inventors

• Wolfgang Kauss · Francheville, FR
• Ludwig Muncke · Lohr am Main, DE
• Dietrich Radtke · Süderbrarup, DE
• Kurt Wittich · Bad Hersfeld, DE

Key dates

• Filing date: Jun 26, 1989
• Grant date: Oct 30, 1990
• Expiry date: Jun 26, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B62D5/07
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A hydraulic system is provided for powering a steering unit, a trailer brake and an auxiliary power unit from a single pump. A control circuit ensures that the hydraulic trailer brake and/or the power steering unit on the vehicle will operate on a preferential basis over the auxiliary power unit. The hydraulic control circuit has two priority valves connected in series. The upstream priority valve has a priority position in which it makes the pump fluid available to a supply line for the common priority flow for the steering and braking apparatus and a non-priority position for powering the auxiliary power unit. The common priority flow is passed through the second or downstream priority valve for priority powering of the power steering circuit.