Multilayer piezoelectric element, injection apparatus, and fuel injection system
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A piezoelectric element and injection device technology, applied in the direction of charging systems, fuel injection devices, electrical components, etc., can solve the problem of reduced displacement of laminated piezoelectric elements, reduced mechanical strength of piezoelectric ceramics, and slow response speed and other problems, to achieve the effect of increasing the moving speed and moving amount, reducing the grain size and increasing the displacement amount
Active Publication Date: 2011-07-20
KYOCERA CORP
View PDF6 Cites 8 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0004] In the above-mentioned multi-layer piezoelectric element, there is a problem that the movement of the domain wall is restricted by the grain boundary of the piezoelectric layer, and the response speed is slowed down.
Furthermore, since the movement of the domain walls is constrained by the grain boundaries of the piezoelectric layer, there is a problem that the amount of displacement of the multi-layer piezoelectric element is reduced.
In addition, in order t
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
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0069] A piezoelectric actuator including the multi-layer piezoelectric element of the present invention was trial-manufactured as follows.
[0070]
[0071] A slurry was prepared by mixing quasi-fired powder of piezoelectric ceramics with an average particle diameter of 0.4 μm and mainly composed of lead zirconate titanate (PZT), a binder, and a plasticizer. Using this slurry, a ceramic green sheet constituting a fired piezoelectric layer having a thickness of about 150 μm was produced by the doctor blade method. Next, a metal paste for internal electrode layers in which a binder was added to a silver-palladium alloy (70% by mass of silver-30% by mass of palladium) was prepared. This metal paste was screen-printed on one side of the ceramic green sheet, and 300 ceramic green sheets printed with the metal paste were laminated. This laminated molded body was held at a peak temperature of 1100° C. for 200 minutes, and then the temperature was lowered to room temperature over ...
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
Property
Measurement
Unit
The average particle size
aaaaa
aaaaa
Login to view more
Abstract
Provided is a multilayer piezoelectric element which achieves a high response speed and an increase in the displacement amount, ensures sufficient mechanical strength, and can suppress degradation of characteristics. A multilayer piezoelectric element (1) includes a layered body (7) in which a piezoelectric layer (3) and an internal electrode layer (5) are alternately layered. In the multilayer piezoelectric element (1), a polarization domain (12) lying astride a plurality of crystal grains (11) is formed in the piezoelectric layer (3). Since the polarization domain (12) lying astride the crystal grains (11) is formed in the piezoelectric layer (3), in the multilayer piezoelectric element (1), the response speed and the displacement amount can be increased, high mechanical strength is ensured, and degradation of characteristics can be suppressed.
Description
technical field [0001] The present invention relates to a laminated piezoelectric element, an injection device using the laminated piezoelectric element, and a fuel injection system. The multilayer piezoelectric element of the present invention is used, for example, as a driving element (piezoelectric actuator), a sensor element, and a circuit element. As the driving element, for example, a fuel injection device of a motor vehicle engine, a liquid injection device such as an inkjet head, a precision positioning device such as an optical device, and an anti-vibration device are exemplified. As the sensor element, for example, a combustion pressure sensor, a knock sensor, an acceleration sensor, a load sensor, an ultrasonic sensor, a pressure sensitive sensor, and a yaw rate sensor are exemplified. Moreover, as a circuit element, a piezoelectric gyroscope, a piezoelectric switch, a piezoelectric transformer, and a piezoelectric circuit breaker are mentioned, for example. Back...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more