Hydraulic control system for a CVT

US6299564A · kind A · utility

Assignee

• ZF Batavia L.L.C. · US

Inventors

• Klaus Gessler · Friedrichshafen, DE
• Bernd Fessler · Kreßbronn, DE
• Hubert Konig · Tettnang, DE
• Stefan Sommer · Ergolding, DE

Key dates

• Filing date: Mar 20, 2000
• Grant date: Oct 9, 2001
• Expiry date: Mar 20, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H61/66272
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A system for control of a CVT driven by a drive unit has an electromagnetically controlled pressure-control valve which actuates both a main pressure valve and a secondary valve for the secondary pulley wherein geometry and spring tension of a main pressure valve and the secondary valve provide different characteristic lines.