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Multilayer piezoelectric element, and injection apparatus and fuel injection system provided therewith

A piezoelectric element, stacked technology, applied in the direction of charging systems, fuel injection devices, electrical components, etc., can solve the problems of difficult continuous drive stacked piezoelectric elements, etc., to achieve the effect of easy extension, stress relief, and easy deformation

Active Publication Date: 2014-06-25
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, once a flaw is formed in the central part of the side surface of the laminate, a crack will proceed from the flaw as a starting point, so there is a problem that it is difficult to continuously drive the multi-layer piezoelectric element stably for a long period of time.

Method used

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  • Multilayer piezoelectric element, and injection apparatus and fuel injection system provided therewith
  • Multilayer piezoelectric element, and injection apparatus and fuel injection system provided therewith
  • Multilayer piezoelectric element, and injection apparatus and fuel injection system provided therewith

Examples

Experimental program
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Effect test

Embodiment

[0083] Embodiments of the multi-layer piezoelectric element of the present invention will be described below.

[0084] A piezoelectric actuator composed of the multi-layer piezoelectric element 1 of the present invention was produced as follows. First, calcined powder of piezoelectric ceramics, a binder composed of an acrylic organic polymer, and a plasticizer are mixed to prepare a slurry. Then, a ceramic green sheet is produced from this slurry by using a known doctor blade method. As a plasticizer, DBP (dibutyl phthalate) was used.

[0085] Next, a conductive paste to be the internal electrode layer 13 was prepared by adding a mixed binder to silver-palladium (Ag—Pd) metal powder. This conductive paste was printed in a predetermined pattern on the above-mentioned ceramic green sheet using a screen printing method. Then, the ceramic green sheets on which the conductive paste was screen-printed were laminated in multiple layers, and the ceramic green sheets were laminated ...

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PUM

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Abstract

[Problem] A center of a multi-layer piezoelectric element is an active region and deforms to a greater degree than ends thereof which is an inactive region during driving operation, and is therefore more susceptible to stress concentration and crack development. [Solution] A multi-layer piezoelectric element (1) includes a columnar stacked body (15) in which piezoelectric layers (11) and internal electrode layers (13) are alternately laminated, and a pair of external electrodes configured to bond to side faces of the columnar stacked body (15), wherein a side face of the columnar stacked body (15) is configured so that a surface roughness of a center of the side face in a stacked direction of the columnar stacked body (15) is greater than those of ends of the side face in the stacked direction of the columnar stacked body (15). This makes it possible to relax the stress exerted on the side face of the columnar stacked body (15), and thereby enhance the durability of the multi-layer piezoelectric element (1).

Description

technical field [0001] The present invention relates to a multilayer piezoelectric element using a laminate in which piezoelectric layers and internal electrode layers are alternately laminated, an injection device including the multilayer piezoelectric element, and a fuel injection system. Background technique [0002] The multi-layer piezoelectric element includes: a laminate in which a plurality of piezoelectric layers and a plurality of internal electrode layers arranged between these piezoelectric layers are alternately laminated; external electrodes formed on the [0003] In this method of manufacturing a multilayer piezoelectric element, a conductive paste to be an internal electrode layer is printed on ceramic green sheets that become piezoelectric layers after firing, and the ceramic green sheets coated with the conductive paste are laminated. A multi-layered laminated body is produced, the laminated compact is fired to produce a laminated body, and the side surfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/083H01L41/273H01L41/337F02M51/06
CPCH01L41/337F02M51/0603H01L41/1875H01L41/0838H01L41/273H10N30/508H10N30/8548H10N30/053H10N30/086
Inventor 佐多哲郎
Owner KYOCERA CORP