Pressure regulating method and apparatus

US6196249A · kind A · utility

Assignee

• LuK Getriebe-Systeme GmbH · DE

Inventors

• Benjamin Kemmner · Baden-Baden, DE
• Thomas Frietsch · Sindelfingen, DE
• Rainer Eidloth · Bamberg, DE

Key dates

• Filing date: Jun 24, 1999
• Grant date: Mar 6, 2001
• Expiry date: Jun 24, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86614
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The pressure of hydraulic fluid which is supplied to the continuously variable transmission in the power train of a motor vehicle is regulated by an apparatus wherein an adjustable pilot valve can receive fluid from a pilot conduit leading to a pressure reducing valve. The pilot conduit normally receives fluid from a further conduit, wherein the pressure of fluid is at least substantially constant, by way of a flow restrictor. A branch conduit serves to evacuate fluid from the pilot conduit into the pilot valve when the latter is at least partially open. The fluid-discharging end of the flow restrictor confronts the inlet of the branch conduit, and such inlet is narrowed to reduce the likelihood of turbulence developing in the fluid stream flowing from the pilot conduit, across the further conduit and into the inlet of the pilot valve.