Patent · US Expired

Pressure regulating method

US6397875B2 · kind B2 · utility

1Cited by

1References

4Claims

0Family size

Assignee

LuK Getriebe-Systeme GmbH · DE

Inventors

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

Key dates

Filing date	Jan 11, 2001
Grant date	Jun 4, 2002
Priority date	—
Expiry date	Jan 11, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/86614
WIPO fieldControl
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.