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US 2006/0214541 A1Published application
Multilayer piezoelectric element, fuel injector having the piezoelectric element and piezoelectric element production method
AssigneeNgk Spark Plug Co., Ltd.
InventorsMasashi Tsuzuki, Hideki Ishikawa
Life of this patent
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Abstract
A multilayer piezoelectric element includes at least one piezoelectric layer unit having sintered piezoelectric ceramic and electrode layers alternately stacked together in a first direction and a positioning member that, when the at least one piezoelectric layer unit is placed in an enclosing member in such a manner that the enclosing member encloses therewith a periphery of the at least one piezoelectric layer unit along a second direction perpendicular to the first direction, controls the position of the at least one piezoelectric layer unit within the enclosing member along the second direction.
Claims19
A multilayer piezoelectric element, comprising:
- at least one piezoelectric layer unit having sintered piezoelectric ceramic and electrode layers alternately stacked together in a first direction;
- a casing member that encloses therewith a periphery of said at least one piezoelectric layer unit along a second direction perpendicular to the first direction;
- and
- a positioning member that controls the position of said at least one piezoelectric layer unit within the enclosing member along the second direction.
1 more element
A multilayer piezoelectric element, comprising:
- at least one piezoelectric layer unit having sintered piezoelectric ceramic and electrode layers alternately stacked together in a first direction;
- and
- a positioning member that, when said at least one piezoelectric layer unit is placed in an enclosing member in such a manner that the enclosing member encloses therewith a periphery of said at least one piezoelectric layer unit along a second direction perpendicular to the first direction, controls the position of said at least one piezoelectric layer unit within the enclosing member along the second direction.
A fuel injector, comprising:
- a multilayer piezoelectric element that includes at least one piezoelectric layer unit having sintered piezoelectric ceramic layers and electrode layers alternately stacked in a first direction;
- an enclosing member that encloses therewith a periphery of said at least one piezoelectric layer unit along a second direction perpendicular to the first direction;
- and
- a positioning member that controls the position of said at least one piezoelectric layer unit within the enclosing member along the second direction.
1 more element
A method of producing a multilayer piezoelectric element, comprising:
- providing at least one piezoelectric layer unit having sintered piezoelectric ceramic layers and electrode layers alternately stacked together in a first direction;
- attaching a positioning member to said at least one piezoelectric layer unit to form a unit assembly;
- and
- inserting the unit assembly into an enclosing member in such a manner as that the enclosing member encloses therewith a periphery of the unit assembly along a second direction perpendicular to the first direction, while allowing the positioning member to control the position of said at least one piezoelectric layer unit within the enclosing member along the second direction.
1 more element
A method of producing a multilayer piezoelectric element, comprising:
- providing piezoelectric layer units each having sintered piezoelectric ceramic layers and electrode layers alternately stacked together in a first direction;
- stacking the piezoelectric layer units together in the first direction with an uncured adhesive material being interposed between opposing end surfaces of adjacent ones of the piezoelectric layer units;
- curing the adhesive material to bond the piezoelectric layer units together;
- and
- arranging a positioning member on the piezoelectric layer units in such a manner that, when the piezoelectric layer units are placed in an enclosing member so that the enclosing member encloses therewith peripheries of the piezoelectric layer units along a second direction perpendicular to the first direction, the positioning member controls the positions of the piezoelectric layer units within the enclosing member along the second direction,
- wherein said stacking includes inserting the piezoelectric layer units and the positioning member in an assembling jig in such a manner that the assembling jig encloses therewith peripheries of the piezoelectric layer units along the second direction, while allowing the positioning member to control the positions of the piezoelectric layer units within the assembling jig along the second direction.
3 more elements
A method of producing a multilayer piezoelectric element, comprising:
- providing at least one piezoelectric layer unit having sintered piezoelectric ceramic layers and electrode layers alternately stacked in a first direction;
- attaching a positioning member to said at least one piezoelectric layer unit in such a manner that, when said at least one piezoelectric layer unit is placed in an enclosing member so that the enclosing member encloses therewith a periphery of said at least one piezoelectric layer unit along a second direction perpendicular to the first direction, the positioning member controls the position of said at least one piezoelectric layer unit within the enclosing member along the second direction;
- and
- forming a resin mold member around the periphery of said at least one piezoelectric layer unit along the second direction,
- wherein said forming includes:
- inserting said at least one piezoelectric layer unit and the positioning member in a molding jig, while allowing the positioning member to control the position of said at least one piezoelectric layer unit within the molding jig along the second direction;
- and
- molding a resinous material into a space between an outer surface of said at least one piezoelectric layer unit and an inner surface of the molding jig.
5 more elements
Dependencies are inferred from the claim text.