Piezoelectric actuator
US6326717A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 2000 |
| Grant date | Dec 4, 2001 |
| Priority date | — |
| Expiry date | Dec 29, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/886
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A piezoelectric actuator, in particular for actuating control valves or injection valves in motor vehicles, having an actuator body embodied in the form of a multilayered laminate made up of stacked layers of piezoelectric material with intervening metallic or electrically conductive layers that function as electrodes. The piezoelectric actuator include end faces, between a bottom plate oriented toward the valve and an opposing top plate, which are elastically prestressed by two spring bands that are disposed in the longitudinal direction on opposite sides of the actuator body and whose prestressing force can be adjusted by an adjusting nut. The piezoelectric actuator is constituted so that the adjusting nut engages in screw fashion with an external thread provided on a central, axial extension bolt of the top plate and which, depending on a screwed position, adjusts the prestressing force of the spring bands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.