Unlock instant, AI-driven research and patent intelligence for your innovation.

Laminated piezoelectric element, injection device having the element, and fuel injection system

A piezoelectric element, laminated technology, applied in the direction of charging systems, fuel injection devices, electrical components, etc., can solve the problems of difficult crack direction stability, cracks, fractures, etc., to achieve suppression of deterioration, superior durability, high durability sexual effect

Active Publication Date: 2013-03-13
KYOCERA CORP
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the cracks extend in this way, fractures may occur within or between crystal grains, or cracks may reach internal electrodes, and electrical short circuits may occur between internal electrodes of different electrodes.
[0009] Especially when the piezoelectric element is driven under high electric field and high pressure, a large stress is applied to the piezoelectric element instantaneously, so it is difficult to stabilize the direction of the crack

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Laminated piezoelectric element, injection device having the element, and fuel injection system
  • Laminated piezoelectric element, injection device having the element, and fuel injection system
  • Laminated piezoelectric element, injection device having the element, and fuel injection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The multi-layer piezoelectric element 1 of the present invention is fabricated as follows.

[0091] First, a slurry of raw material powders, binders, and plasticizers mainly composed of lead zirconate titanate (PZT) powder with an average particle size of 0.4 μm was prepared, and the thickness was measured by the doctor blade method. 150μm ceramic green sheet.

[0092] Next, the conductive paste A which added the binder to the raw material powder containing the silver-palladium alloy powder which is Ag95wt%-Pd5wt% metal composition was produced.

[0093] Furthermore, the conductive paste B which added the binder to the raw material powder containing the silver-palladium alloy powder which is Ag98wt%-Pd2wt% metal composition was produced.

[0094] In sample number 1, conductive paste A was printed on one surface of the ceramic green sheet to have a thickness of 30 μm by the screen printing method. Also, each green sheet on which the conductive paste A was printed was l...

Embodiment 2

[0118] The multi-layer piezoelectric element 1 of the present invention was produced as follows.

[0119] First, in the same manner as the green sheet of Example 1, a ceramic green sheet was produced. Next, in the same manner as the conductive paste A of Example 1, conductive paste C was produced. Furthermore, in the raw material powder containing silver alloy powder having a metal composition of Ag98wt%-Pd2wt%, as a component for forming the coating layer 21, 0.01wt% of SiO was added to the silver-palladium alloy powder. 2 Tetraethoxysilane (TEOS) and 0.01wt% Pb relative to the silver-palladium alloy powder 3 o 4 It was added together with a binder, and the electroconductive paste D was produced.

[0120]In sample number 6, conductive paste C was printed on one surface of the ceramic green sheet to have a thickness of 30 μm by the screen printing method. Also, each green sheet on which the conductive paste C was printed was stacked to fabricate a stacked structure 7 . Th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided is a multi-layer piezoelectric element in which the amount of the positional displacement can be suppressed even when continuous driving is performed for a long time under high electrical field and high pressure, and which may have a good durability. The laminated piezoelectric element comprises a stacked body in which piezoelectric layers and metal layers are stacked alternately one on another. The metal layers comprise internal electrodes and a low-rigidity metal layer which has rigidity lower than those of the piezoelectric layer and the internal electrode. The low-rigidity metal layer comprises a plurality of metal parts isolated from each other via voids, and a covering layer which covers at least a part of the metal parts.

Description

technical field [0001] The present invention relates to a multi-layer piezoelectric element, an injection device, and a fuel injection system. For example, it relates to the driving of a fuel injection device mounted on an automobile engine, a liquid injection device such as an inkjet, a precision positioning device such as an optical device, and an anti-vibration device. Elements (piezoelectric actuators), sensor elements mounted on combustion pressure sensors, knock sensors, acceleration sensors, load sensors, ultrasonic sensors, pressure-sensitive sensors, yaw rate sensors, etc., and piezoelectric gyros, piezoelectric switches , Piezoelectric transformers, piezoelectric circuit breakers and other circuit components, multi-layer piezoelectric elements, injection devices and fuel injection systems equipped with them. Background technique [0002] Conventionally, multi-layer piezoelectric elements have been required to be miniaturized while ensuring a large amount of displac...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/083F02M51/06H01L41/22H01L41/257H01L41/297H01L41/39
CPCH01L41/0838F02M51/0603H10N30/508
Inventor 冈村健
Owner KYOCERA CORP