Hydraulic system for a transmission of a motor vehicle

US10794468B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Markus Herrmann · Scheidegg, DE
• Thilo Schmidt · Meckenbeuren, DE
• Armin Haugg · Friedrichshafen, DE
• Alexander Haberstock · Ravensburg, DE
• Christian Popp · Kreßbronn, DE

Key dates

• Filing date: Feb 17, 2017
• Grant date: Oct 6, 2020
• Expiry date: Feb 17, 2037

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/0037
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydraulic system for a transmission of a motor vehicle, the system having first and second pumps for conveying hydraulic fluid into primary and/or system-pressure circuits so that an intended pressure prevails in the circuits. The system further including liquid retention means preventing a flow of hydraulic fluid conveyed by the second pump from being conducted through the first pump when the first pump is not conveying and the second pump is conveying, and preventing a flow of hydraulic fluid conveyed by the first pump from being conducted through the second pump when the second pump is not conveying and the first pump is conveying. The system additionally including a sailing-mode lubricating valve for controlling, by an open-loop system, a flow rate of hydraulic fluid conveyed by the second pump into the primary and/or secondary system-pressure circuits such that the intended pressure is set in the system-pressure circuits.