Patent · US Active

Control valve for a camshaft adjuster

US8118059B2 · kind B2 · utility

0Cited by

11References

9Claims

0Family size

Assignee

Schaeffler Technologies AG & Co. KG · DE

Inventors

Jens Hoppe · Erlangen, DE
Andreas Rohr · Idar-Oberstein, DE

Key dates

Filing date	Sep 7, 2006
Grant date	Feb 21, 2012
Priority date	—
Expiry date	May 23, 2029

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/8671
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A control valve for a hydraulic adjuster for the camshaft of an internal combustion engine is provided, wherein an actuator acts on a pressure part (12) embedded in a control piston (5). In order to prevent the piston (5) from being blocked in the valve housing by the expansion thereof caused by the pressure part embedment, the pressure part (12) and/or the control piston (5) is/are provided with radial recesses (34) in the embedment area (13) which make it possible to limit joining forces and the resulting radial expansion of the piston (5). Alternatively or in addition, the external surface of the control valve (5) has a reduced cross-section in the embedment area (13).

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