Global Patent Index - EP 1076918 A1

EP 1076918 A1 2001-02-21 - PIEZO-ELECTRIC ACTUATOR

Title (en)

PIEZO-ELECTRIC ACTUATOR

Title (de)

PIEZOELEKTRISCHER AKTOR

Title (fr)

ACTIONNEUR PIEZO-ELECTRIQUE

Publication

EP 1076918 A1 (DE)

Application

EP 99966875 A

Priority

  • DE 9903999 W
  • DE 19906468 A

Abstract (en)

[origin: DE19906468A1] The invention relates to a piezo-electric actuator, especially a piezo-electric actuator for actuating control valves or injection valves in motor vehicles. The inventive actuator comprises an actuator body (10) in the form of a multi-layered laminate consisting of layers of a piezo-electric material and metal or electroconductive layers acting as electrodes placed therebetween. Said actuator body is elastically pre-tensed on the front faces thereof between a bottom plate (11) on the valve side and an opposite head plate (12) by means of two spring strips (13, 14) in a longitudinal direction on opposite sides of the body of the actuator, whereby the pre-tensing force can be adjusted using adjusting means. The piezo-electric actuator is characterized in that the adjusting means include an adjusting nut (16) that is screwed onto the outer thread (15) of a central axial extension pin (18) of the head plate (12), whereby said nut enables the pre-tensing force of the spring strips (13, 14) to be adjusted independently from the screw position thereof.

IPC 1-7 (main, further and additional classification)

H01L 41/083; F02M 51/06

IPC 8 full level (invention and additional information)

F02M 51/06 (2006.01); H01L 41/053 (2006.01); H01L 41/083 (2006.01); H02N 2/04 (2006.01); F02M 63/00 (2006.01)

CPC (invention and additional information)

F02M 51/0603 (2013.01); H01L 41/0536 (2013.01); H01L 41/083 (2013.01)

Citation (search report)

See references of WO 0049666A1

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

DE 19906468 A1 20000831; DE 19906468 B4 20080207; EP 1076918 A1 20010221; JP 2002537531 A 20021105; US 6326717 B1 20011204; WO 0049666 A1 20000824

INPADOC legal status


2007-01-10 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20060701

2004-05-26 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Designated State(s): DE FR GB IT

2001-04-25 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010226

2001-02-21 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE