Patent · US Expired

Piezo-control valve for fuel injection systems of internal combustion engines

US5740969A · kind A · utility

23Cited by

5References

6Claims

0Family size

Assignee

Mercedes-Benz Group AG · DE

Inventors

Karl-Heinz Hoffmann · Rommerskirchen, DE
Paul Schwerdt · Freudenstadt, DE
Gerd Huber · Birkenfeld, DE

Key dates

Filing date	Oct 9, 1996
Grant date	Apr 21, 1998
Priority date	—
Expiry date	Oct 9, 2016

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16K31/007
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

In a piezo-control valve for fuel injection systems of internal combustion engines wherein a piezo-ceramic actuating rod is mounted with one end firmly to one end of a valve housing having a nozzle body with a valve seat disposed at the other end and a nozzle control needle is disposed in the nozzle body and pressed by the piezo-ceramic actuating rod onto the valve seat in the nozzle body when the piezo-ceramic actuating rod is not activated, the valve housing includes a sleeve-like portion disposed around the piezo-ceramic actuating rod which consists of a material compensating for temperature-caused changes in the length of the piezo-ceramic actuating rod.

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