Hydraulic control arrangement for controlling a variable fluid volume flow

US8464755B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Markus Herrmann · Scheidegg, DE
• Anton Fritzer · Markdorf, DE

Key dates

• Filing date: Feb 6, 2009
• Grant date: Jun 18, 2013
• Expiry date: Feb 28, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86606
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydraulic control system for controlling a variable fluid volume flow to a consumer (6, 60, 94, 126, 146, 162), for example a flow of cooling oil to a wet-operating clutch, with a hydraulically pilot-controlled control valve connected to a fluid supply. The first control valve (2, 56, 90, 122, 142) is designed such that, in the absence of any pilot control pressure (pVST), the valve delivers a specified initial volume flow (Q1) and, as the variable pilot control pressure (pVST) increases, the valve delivers a continuously increasing volume flow (QK). At least one second, independent, also hydraulically pilot-controlled valve (170) is designed such that this valve is activated in a specified range (55, 88, 120, 132, 140, 152) of the variable pilot control pressure (pVST).