JPH06343273A - Piezoelectric actuator - Google Patents
Piezoelectric actuatorInfo
- Publication number
- JPH06343273A JPH06343273A JP5154389A JP15438993A JPH06343273A JP H06343273 A JPH06343273 A JP H06343273A JP 5154389 A JP5154389 A JP 5154389A JP 15438993 A JP15438993 A JP 15438993A JP H06343273 A JPH06343273 A JP H06343273A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- piezoelectric device
- valve
- actuator
- juxtaposed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アクチュエータ本体内
に介挿した圧電装置にセラミックスもしくは圧電装置よ
り成る並設部材を並設し、温度変化の悪影響を受けるこ
と無く、印加電圧の制御により可動部材の移動を制御す
る圧電アクチュエータに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a piezoelectric device inserted in an actuator body and a ceramic or piezoelectric device arranged side by side, and is movable by controlling the applied voltage without being adversely affected by temperature changes. The present invention relates to a piezoelectric actuator that controls movement of members.
【０００２】[0002]
【従来の技術】従来の燃料噴射弁に適用された圧電アク
チュエータ（特開平２−１１２６６３）は、図５に示す
ように噴射口Ｏを有する金属製の弁ケースＣ内に同軸的
に可動部材としての金属製のニードル弁Ｎが介挿され、
ニードル弁Ｎと弁フタＦとの間にコイルバネＢが介挿さ
れ、ニードル弁Ｎの肩部Ｓと弁ケースＣの先端部Ｅとの
間に図６に示す中空円筒状の圧電装置Ｐがニードル弁Ｎ
と同軸的に介挿されているものであった。2. Description of the Related Art A piezoelectric actuator (Japanese Unexamined Patent Publication No. 2-112663) applied to a conventional fuel injection valve has a metallic valve case C having an injection port O as shown in FIG. The metal needle valve N of is inserted,
The coil spring B is interposed between the needle valve N and the valve lid F, and the hollow cylindrical piezoelectric device P shown in FIG. 6 is provided between the shoulder S of the needle valve N and the tip E of the valve case C. Valve N
It was inserted coaxially with.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の圧電アクチ
ュエータは、金属製のニードル弁Ｎと弁ケースＣとの間
に中空円筒状の圧電装置Ｐを介挿するものであるため、
温度が変化するとニードル弁Ｎおよび弁ケースＣと圧電
装置Ｐの線膨張係数の差により、ニードル弁のストロー
クにバラツキが生じたり、極端な場合は開弁および閉弁
に悪影響が出るという問題があった。In the conventional piezoelectric actuator described above, the hollow cylindrical piezoelectric device P is interposed between the metallic needle valve N and the valve case C.
When the temperature changes, there is a problem that the stroke of the needle valve varies due to the difference in the linear expansion coefficient between the needle valve N and the valve case C and the piezoelectric device P, and in extreme cases, the valve opening and closing may be adversely affected. It was
【０００４】そこで本発明者らは、圧電装置の線膨張係
数に近いセラミックスより成る並設部材を圧電装置に並
設して、線膨張係数の差により可動部材のアクチュエー
タ本体内における位置が変化しないようにするという本
発明の技術的思想に着眼し、更に研究開発を重ねた結
果、温度が変化しても可動部材の移動量が変化しないよ
うにするとともに可動部材の動作に悪影響が出ないよう
にするという目的を達成する本発明に到達したものであ
る。Therefore, the inventors of the present invention have installed a juxtaposed member made of ceramics having a linear expansion coefficient close to that of the piezoelectric device in the piezoelectric device, and the position of the movable member in the actuator body does not change due to the difference in the linear expansion coefficient. As a result of further research and development focusing on the technical idea of the present invention, the movement amount of the movable member does not change even if the temperature changes, and the operation of the movable member is not adversely affected. The present invention has been achieved to achieve the object of
【０００５】[0005]
【課題を解決するための手段】本発明（請求項１に記載
の第１発明）の圧電アクチュエータは、圧電アクチュエ
ータ本体と、アクチュエータ本体内に介挿された可動部
材と、アクチュエータ本体内に介挿され、可動部材を一
方の方向に付勢するスプリング部材と、アクチュエータ
本体内に介挿され、一端を可動部材に係止するとともに
他端をバネ部材に係止された係止部材に係止された筒状
体の圧電素子であって、印加される電圧が制御されるこ
とにより可動部材を移動させる圧電装置と、係止部材と
アクチュエータ本体との間に介挿され、圧電装置に並設
されたセラミックスより成る並設部材とから成るもので
ある。A piezoelectric actuator according to the present invention (a first invention according to claim 1) includes a piezoelectric actuator body, a movable member inserted in the actuator body, and an actuator body. And a spring member for urging the movable member in one direction, and the spring member is inserted in the actuator body and has one end locked to the movable member and the other end locked to a locking member locked to the spring member. A piezoelectric element having a cylindrical shape, which moves a movable member when an applied voltage is controlled, and is inserted between a locking member and an actuator body and arranged in parallel with the piezoelectric device. And a juxtaposed member made of ceramics.
【０００６】本発明（請求項２に記載の第２発明）の圧
電アクチュエータは、圧電アクチュエータ本体と、アク
チュエータ本体内に介挿された可動部材と、アクチュエ
ータ本体内に介挿され、可動部材を一方の方向に付勢す
るスプリング部材と、アクチュエータ本体内に介挿さ
れ、一端を可動部材に係止するとともに他端をバネ部材
に係止された係止部材に係止された筒状体の圧電素子で
あって、印加される電圧が制御されることにより可動部
材を移動させる圧電装置と、係止部材とアクチュエータ
本体との間に介挿され、圧電装置に並設される第２の圧
電装置で構成された並設部材とから成るものである。A piezoelectric actuator of the present invention (a second invention according to claim 2) is a piezoelectric actuator main body, a movable member inserted in the actuator main body, and a movable member inserted in the actuator main body. , And a cylindrical piezoelectric member inserted in the actuator body and having one end locked to the movable member and the other end locked to a locking member locked to the spring member. A second piezoelectric device which is an element and is provided between the piezoelectric device, which moves the movable member by controlling the applied voltage, and the piezoelectric device, which is interposed between the locking member and the actuator body. And a side-by-side member composed of.
【０００７】[0007]
【作用】上記構成より成る第１発明の圧電アクチュエー
タは、温度が変化しても圧電装置とセラミックスの並設
部材の線膨張係数に差が殆ど無いので、圧電装置と並設
部材の温度変化による軸方向の変形量が等しいので、ア
クチュエータ本体に対して並設部材、係止部材および圧
電装置を介して係止される可動部材の相対的位置が殆ど
変化しない。In the piezoelectric actuator of the first invention having the above structure, there is almost no difference in the linear expansion coefficient between the piezoelectric device and the ceramic side-by-side member even if the temperature changes. Since the amount of deformation in the axial direction is the same, the relative positions of the movable member that is locked to the actuator body via the juxtaposed member, the locking member, and the piezoelectric device hardly change.
【０００８】上記構成より成る第２発明の圧電アクチュ
エータは、温度が変化しても圧電装置と圧電装置で構成
される並設部材の線膨張係数に差が無いので、圧電装置
と並設部材の温度変化による軸方向の変形量が等しいの
で、アクチュエータ本体に対して並設部材、係止部材お
よび圧電装置を介して係止される可動部材の相対的位置
が変化しない。In the piezoelectric actuator of the second aspect of the present invention having the above structure, there is no difference in the linear expansion coefficient between the piezoelectric device and the juxtaposed member composed of the piezoelectric device even if the temperature changes, so that the piezoelectric device and the juxtaposed member do not differ. Since the amount of deformation in the axial direction due to the temperature change is equal, the relative positions of the parallel member, the locking member, and the movable member locked via the piezoelectric device with respect to the actuator body do not change.
【０００９】[0009]
【発明の効果】上記作用を奏する第１発明の圧電アクチ
ュエータは、温度が変化してもアクチュエータ本体内に
おける可動部材の位置が殆ど変化せず、可動部材の移動
量が変化しないとともに、可動部材の動作に悪影響が出
ないようにするという効果を奏する。According to the piezoelectric actuator of the first aspect of the present invention, even if the temperature changes, the position of the movable member in the actuator body hardly changes, the moving amount of the movable member does not change, and This has the effect of preventing the operation from being adversely affected.
【００１０】上記作用を奏する第２発明の圧電アクチュ
エータは、第１発明の効果に加え、圧電装置と並設部材
の圧電装置にそれぞれ正負逆の振幅を与えることによ
り、可動部材のストローク量を大きくすることを可能に
するという効果を奏する。In addition to the effect of the first aspect of the invention, the piezoelectric actuator of the second aspect of the invention, which has the above-described operation, increases the stroke amount of the movable member by applying positive and negative amplitudes to the piezoelectric device and the piezoelectric device in parallel. There is an effect that it is possible to do.
【００１１】[0011]
【実施例】以下本発明の実施例につき、図面を用いて説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】（第１実施例）第１実施例の圧電アクチュ
エータを適用した燃料噴射弁は、図１および図２に示す
ように、小径部１１の先端に噴射口１２を有するととも
に燃料入口１４を形成した第１の大径部１３と第２の大
径部１６とを有する弁本体１と、弁本体１の小径部１１
に介挿されるインナバルブ２０を備えた小径の第１部材
２１と第１の大径部１３に介挿される第２部材２２およ
び第２部材２２に当接する第３部材２３とから成るニー
ドル弁部材２と、ニードル弁部材２の第２部材と第１の
大径部１３との間に介挿されたコイルスプリング３０に
より構成され、ニードル弁部材２を開く方向に付勢する
スプリング部材３と、弁本体１内においてニードル弁部
材２の第３部材２３と弁本体１の蓋部１５に一端が係止
されたバネ部材を構成するコイルスプリング４２の他端
に係止された係止部材４３との間に介挿された中実円筒
体４０の圧電素子であって、印加電圧が負に切り換えら
れたら収縮してニードル弁部材２を開く方向に制御する
圧電装置４と、係止部材４３と第２の大径部１６の肩部
１６Ｓとの間に負の電圧を印加した状態で介挿され圧電
装置４と同軸的に並設した圧電装置より成る並設部材７
と、圧電装置４および並設部材７を駆動する駆動回路５
と、駆動回路５を制御するＥＦＩコンピュータ６とから
成るものである。(First Embodiment) A fuel injection valve to which the piezoelectric actuator of the first embodiment is applied has an injection port 12 at the tip of a small diameter portion 11 and a fuel inlet 14 as shown in FIGS. A valve body 1 having a formed first large diameter portion 13 and a second large diameter portion 16 and a small diameter portion 11 of the valve body 1.
Needle valve member 2 including a first member 21 having a small diameter with an inner valve 20 inserted in the second member, a second member 22 inserted in the first large diameter portion 13 and a third member 23 abutting against the second member 22 A spring member 3 configured to urge the needle valve member 2 in the opening direction, and a coil spring 30 that is interposed between the second member of the needle valve member 2 and the first large diameter portion 13. In the main body 1, the third member 23 of the needle valve member 2 and the locking member 43 locked to the other end of the coil spring 42, which constitutes a spring member of which one end is locked to the lid portion 15 of the valve main body 1. A piezoelectric element of the solid cylindrical body 40 interposed between the piezoelectric element 4 and the locking member 43, which contracts when the applied voltage is switched to the negative and controls the needle valve member 2 in the opening direction, Negative between the large diameter part 16 and the shoulder part 16S Juxtaposed member 7 made of a piezoelectric device having piezoelectric device 4 and coaxially arranged interposed in a state of applying a voltage
And a drive circuit 5 for driving the piezoelectric device 4 and the juxtaposed member 7.
And an EFI computer 6 for controlling the drive circuit 5.
【００１３】弁本体１は、図１に示すように、同軸的に
直列に一体形成した小径部１１と第１の大径部１３およ
び第２の大径部１６とから成る中空円筒体１０である。
小径部１１の開口部には、テーパ面より成る弁座部１１
Ｓと、噴射口１２が同軸的に形成されている。第１の大
径部１３の外周壁には、燃料導入口１４が形成されてい
る。第２の大径部１６の開口端には、円形の蓋部１５が
装着される。第１および第２の大径部１３および１６
は、それぞれ異なった径の内周面を有し、開口端に近づ
くに従い径が階段状に大きくなるように形成されてい
る。As shown in FIG. 1, the valve body 1 is a hollow cylindrical body 10 composed of a small diameter portion 11, a first large diameter portion 13 and a second large diameter portion 16 which are coaxially and integrally formed in series. is there.
The opening of the small-diameter portion 11 has a valve seat portion 11 made of a tapered surface.
S and the injection port 12 are formed coaxially. A fuel introduction port 14 is formed on the outer peripheral wall of the first large diameter portion 13. A circular lid portion 15 is attached to the open end of the second large diameter portion 16. First and second large diameter portions 13 and 16
Have inner peripheral surfaces of different diameters, and are formed so that the diameter increases stepwise as they approach the opening end.
【００１４】ニードル弁部材２の第１部材２１は、図１
に示すように略Ｔ字状の縦断面を有する部材で構成さ
れ、弁座部１１Ｓに当接する先細形状のインナバルブ２
０と第２部材２２と係合するＴ字部２１Ｔと、先端のイ
ンナバルブ２０とＴ字部２１Ｔとを連結する小径棒状の
連結部２１Ｎとから成る。The first member 21 of the needle valve member 2 is shown in FIG.
As shown in FIG. 5, the tapered inner valve 2 is formed of a member having a substantially T-shaped vertical cross section and abuts on the valve seat portion 11S.
0 and a T-shaped portion 21T that engages with the second member 22, and a small-diameter rod-shaped connecting portion 21N that connects the inner valve 20 at the tip and the T-shaped portion 21T.
【００１５】ニードル弁部材２の第２部材２２は、略Ｕ
字状の縦断面を有する部材で構成され、先端底部には第
１部材２１のＴ字部２１Ｔを介挿する穴部２２Ｈが形成
され、側壁には貫通穴２２Ｐが形成されている。The second member 22 of the needle valve member 2 is substantially U-shaped.
A hole 22H for inserting the T-shaped portion 21T of the first member 21 is formed in the bottom of the tip end, and a through hole 22P is formed in the side wall.
【００１６】ニードル弁部材２の第３部材２３は、略Ｕ
字状の縦断面を有する部材で構成され、先端には平坦面
２３Ｐが形成され、外周面には環状の溝２３Ｇが形成さ
れ、燃料をシールするためのＯリング２３Ｏが介挿され
ている。The third member 23 of the needle valve member 2 is substantially U-shaped.
It is composed of a member having a V-shaped vertical cross section, a flat surface 23P is formed at the tip, an annular groove 23G is formed on the outer peripheral surface, and an O-ring 23O for sealing fuel is inserted.
【００１７】ニードル弁部材２の第１部材２１のＴ字部
２１Ｔと第３部材の平坦面２３Ｐとの間に一定の付勢力
で第１部材２１を弁本体１の弁座部１１Ｓに対して押圧
するコイルスプリング２４が介挿されている。Between the T-shaped portion 21T of the first member 21 of the needle valve member 2 and the flat surface 23P of the third member, the first member 21 is pressed against the valve seat portion 11S of the valve body 1 by a constant biasing force. A coil spring 24 that presses is inserted.
【００１８】スプリング部材３は、弁本体１の第１の大
径部１３の肩部１３Ｓとニードル弁部材２の第２部材２
２の底部２２Ｓとの間に介挿されたコイルスプリング３
０で構成され、ニードル弁部材２を弁本体１の噴射口１
２から遠ざける方向に常時一定の付勢力で付勢する構成
より成る。The spring member 3 includes a shoulder portion 13S of the first large diameter portion 13 of the valve body 1 and a second member 2 of the needle valve member 2.
Coil spring 3 inserted between the bottom 22S and
0, the needle valve member 2 is connected to the injection port 1 of the valve body 1.
It is configured such that it is always biased with a constant biasing force in a direction away from 2.
【００１９】圧電装置４は、中実円板の圧電素子が軸方
向に多数積層された中実円筒体４０で構成され、正の一
定の印加電圧が印加され軸方向に膨張した状態でニード
ル弁部材２の第３部材２３の底部と弁本体１の蓋部１５
に係止されたバネ部材を構成するコイルスプリング４２
によって付勢された円形の係止部材４３との間に介挿さ
れ、スプリング部材３の付勢力に抗して噴射口１２の弁
座部１１Ｓにニードル弁部材２のインナバルブ２０を当
接させており、燃料噴射時には、負の一定の印加電圧に
切り換えられると、圧電装置４が軸方向に収縮するとと
もに、スプリング部材３のコイルスプリング３０の付勢
力によりニードル弁部材２のインナバルブ２０を噴射口
１２の弁座部１１Ｓより離し、燃料が噴射口１２より噴
射することを可能にする構成より成る。The piezoelectric device 4 is composed of a solid cylindrical body 40 in which a large number of solid disk piezoelectric elements are laminated in the axial direction, and the needle valve is expanded in the axial direction when a constant positive applied voltage is applied. The bottom of the third member 23 of the member 2 and the lid 15 of the valve body 1
Coil spring 42 constituting a spring member locked to
The inner valve 20 of the needle valve member 2 is brought into contact with the valve seat portion 11S of the injection port 12 against the biasing force of the spring member 3 by being inserted between the circular locking member 43 biased by. Therefore, at the time of fuel injection, when the voltage is switched to a constant negative applied voltage, the piezoelectric device 4 contracts in the axial direction, and the inner valve 20 of the needle valve member 2 causes the injection port 12 by the biasing force of the coil spring 30 of the spring member 3. The valve seat 11S is separated from the valve seat 11S, and the fuel can be injected from the injection port 12.
【００２０】並設部材７は、環状の圧電素子が軸方向に
多数積層された中空円筒体の圧電装置７０で構成され、
圧電装置４と第２の大径部１６との間に挿置され、第２
の大径部１６の肩部１６Ｓと係止部材４３との間に負の
一定の電圧が印加され軸方向に収縮した状態で介挿され
ており、燃料噴射時には後述する駆動回路５により印加
される電圧が正の一定の電圧に切り換えられるのでコイ
ルスプリング４２に抗して軸方向に膨張し得る構成より
成る。The juxtaposed member 7 is composed of a hollow cylindrical piezoelectric device 70 in which a large number of annular piezoelectric elements are laminated in the axial direction,
It is inserted between the piezoelectric device 4 and the second large-diameter portion 16, and the second
A constant negative voltage is applied between the shoulder portion 16S of the large-diameter portion 16 and the locking member 43 so as to be contracted in the axial direction, and is applied by the drive circuit 5 described later at the time of fuel injection. Since the voltage applied to the coil spring 42 is switched to a constant positive voltage, the coil spring 42 can expand in the axial direction against the coil spring 42.
【００２１】駆動回路５は、図２に示すようにイグニッ
ションスイッチＩＧを介さずにバッテリＢに直接接続さ
れた回路であり、ＤＣ−ＤＣコンバータ５１と、直列に
接続され中点を接地したコンデンサ５２、５３と、およ
び切換スイッチ５４とから成り、切換スイッチ５４の切
換により圧電装置４および並設部材７に正又は負の一定
の電圧を印加する構成より成る。すなわち、エンジンが
停止している時も正および負の一定の電圧が圧電装置４
および並設部材７に印加される構成より成る。As shown in FIG. 2, the drive circuit 5 is a circuit directly connected to the battery B without passing through the ignition switch IG, and is connected to a DC-DC converter 51 and a capacitor 52 connected in series and having its center point grounded. , 53, and a changeover switch 54, and a constant positive or negative voltage is applied to the piezoelectric device 4 and the juxtaposed member 7 by the changeover of the changeover switch 54. That is, even when the engine is stopped, the positive and negative constant voltages are applied to the piezoelectric device 4.
And applied to the juxtaposed member 7.
【００２２】ＥＦＩコンピュータ６は、イグニッション
スイッチＩＧを介してバッテリＢに接続されており、エ
ンジンの回転に同期して各気筒の噴射信号を出力するこ
とにより、各気筒に対応する駆動回路５の切換スイッチ
５４を負の一定電圧が供給されている端子に切り換え得
る構成より成る。The EFI computer 6 is connected to the battery B via the ignition switch IG, and outputs the injection signal of each cylinder in synchronization with the rotation of the engine to switch the drive circuit 5 corresponding to each cylinder. The switch 54 can be switched to a terminal to which a constant negative voltage is supplied.
【００２３】上記構成より成る第１実施例の圧電アクチ
ュエータを適用した燃料噴射弁は、燃料を噴射しない時
においては、正側のコンデンサ５２からの正の一定電圧
が切換スイッチ５４を介して圧電装置４に印加されると
ともに並設部材７の圧電装置７０には負の一定電圧が印
加されており、圧電装置４はそれによりコイルスプリン
グ３０に抗して軸方向に膨張しているとともに並設部材
７の圧電装置７０は軸方向に収縮しているのて、ニード
ル弁部材２のインナバルブ２０が噴射口１２の弁座部１
１Ｓに当接している。In the fuel injection valve to which the piezoelectric actuator of the first embodiment having the above structure is applied, when the fuel is not injected, the positive constant voltage from the positive side capacitor 52 is transmitted through the changeover switch 54 to the piezoelectric device. 4, and a constant negative voltage is applied to the piezoelectric device 70 of the juxtaposed member 7, whereby the piezoelectric device 4 is axially expanded against the coil spring 30 and the juxtaposed member is also applied. Since the piezoelectric device 70 of No. 7 is contracted in the axial direction, the inner valve 20 of the needle valve member 2 is connected to the valve seat portion 1 of the injection port 12.
It is in contact with 1S.
【００２４】この状態においてＥＦＩコンピュータ６か
ら燃料の噴射信号が出力されると、切換スイッチ５４が
切り換えられ負側のコンデンサ５３からの負の一定電圧
が圧電装置４に印加されるとともに圧電装置７０には正
の一定電圧が印加され、圧電装置４が軸方向に収縮する
とともに圧電装置７０が軸方向に膨張するので、圧電装
置７０がコイルスプリング４２に抗して係止部材４３を
軸方向左方に移動させ、コイルスプリング３０の付勢力
により、ニードル弁部材２を軸方向図１中左方に移動す
るので、インナバルブ２０が噴射口１２の弁座部１１Ｓ
から離れ、燃料が噴射口１２より噴射される。When a fuel injection signal is output from the EFI computer 6 in this state, the changeover switch 54 is changed over so that a constant negative voltage from the negative side capacitor 53 is applied to the piezoelectric device 4 and the piezoelectric device 70. Is applied with a positive constant voltage, the piezoelectric device 4 contracts in the axial direction and the piezoelectric device 70 expands in the axial direction. Therefore, the piezoelectric device 70 resists the coil spring 42 and moves the locking member 43 axially leftward. The needle valve member 2 is moved to the left in the axial direction in FIG. 1 by the urging force of the coil spring 30, so that the inner valve 20 moves the valve seat portion 11S of the injection port 12.
And fuel is injected from the injection port 12.
【００２５】上記作用を奏する第１実施例の圧電アクチ
ュエータを適用した燃料噴射弁は、係止部材４３を介し
て圧電装置４と圧電装置７０より成る並設部材７とを並
設するものであるため、使用中温度が変化しても、可動
部材であるニードル弁部材２の位置が変化せず、ストロ
ーク量が変化しないとともに、噴射弁が開いたり、閉じ
たりすることが無いという効果を奏する。In the fuel injection valve to which the piezoelectric actuator of the first embodiment having the above-described operation is applied, the piezoelectric device 4 and the juxtaposed member 7 composed of the piezoelectric device 70 are arranged in parallel via the locking member 43. Therefore, even if the temperature during use changes, the position of the needle valve member 2 that is the movable member does not change, the stroke amount does not change, and the injection valve does not open or close.
【００２６】また第１実施例の圧電アクチュエータを適
用した燃料噴射弁は、駆動回路５により、圧電装置４に
は負の一定電圧を印加するとともに、並設部材７を構成
する圧電装置７０には正の一定電圧を印加して、圧電装
置７０により圧電装置４を係止する係止部材４３をコイ
ルスプリング４２に抗して軸方向左方へ移動させるとと
もに圧電装置４を軸方向に収縮させるので、圧電装置４
の変形のみを利用するものに比べ大振幅（ストローク）
を得ることが出来るとともに、同一の振幅に揃えるとす
れば圧電装置４の積層枚数を減らすことができ、軸長の
短い圧電アクチュエータを実現し、燃料噴射弁をコンパ
クトにすることができるという効果を奏する。Further, in the fuel injection valve to which the piezoelectric actuator of the first embodiment is applied, the drive circuit 5 applies a constant negative voltage to the piezoelectric device 4, and the piezoelectric device 70 forming the juxtaposed member 7 has By applying a positive constant voltage, the piezoelectric device 70 moves the locking member 43 for locking the piezoelectric device 4 axially leftward against the coil spring 42 and contracts the piezoelectric device 4 axially. , Piezoelectric device 4
Large amplitude (stroke) compared to using only deformation of
If the same amplitude is obtained, the number of stacked piezoelectric devices 4 can be reduced, a piezoelectric actuator having a short axial length can be realized, and the fuel injection valve can be made compact. Play.
【００２７】（第２実施例）第２実施例の圧電アクチュ
エータを適用した燃料噴射弁は、第１発明の実施例であ
り、図３に示すように第１実施例において圧電装置７０
により構成した並設部材７を中空円筒状のセラミックス
７１により構成した点が第１実施例との主たる相違点で
ある。(Second Embodiment) A fuel injection valve to which the piezoelectric actuator of the second embodiment is applied is an embodiment of the first invention, and as shown in FIG. 3, the piezoelectric device 70 in the first embodiment is used.
The main difference from the first embodiment is that the juxtaposed member 7 constituted by the above is constituted by the hollow cylindrical ceramics 71.
【００２８】上記構成より成る第２実施例の圧電アクチ
ュエータを適用した燃料噴射弁は、並設部材７を圧電装
置４の線膨張係数に近いセラミックス７１により構成し
たので、使用中温度が変化しても、ニードル弁部材２の
位置が殆ど変化せず、噴射弁が開いたり閉じたりするこ
とが無く、ストローク量が変化することがないという効
果を奏する。In the fuel injection valve to which the piezoelectric actuator of the second embodiment having the above structure is applied, since the juxtaposed member 7 is made of ceramics 71 having a coefficient of linear expansion close to that of the piezoelectric device 4, the temperature during use changes. However, the position of the needle valve member 2 hardly changes, the injection valve does not open or close, and the stroke amount does not change.
【００２９】（第３実施例）第３実施例の圧電アクチュ
エータを適用した燃料噴射弁は、第１発明の実施例であ
り、図４に示すように並設部材７を圧電装置４の積層さ
れた素子の電極のトータルの厚さに相当する厚さを有す
るステンレス層７２を介挿したサンドイッチ構造のセラ
ミックス７１により構成するもので、並設部材７の温度
変化に伴う膨張量および収縮量を圧電装置４のそれと同
一化するもので、使用中温度が変化してもニードル弁部
材の位置が変化せず、噴射弁が開いたり閉じたりするこ
とが無く、ストローク量が変化することが無いという効
果を奏する。(Third Embodiment) A fuel injection valve to which the piezoelectric actuator of the third embodiment is applied is an embodiment of the first invention, and as shown in FIG. 4, the juxtaposed member 7 is laminated on the piezoelectric device 4. The ceramics 71 having a sandwich structure in which a stainless layer 72 having a thickness corresponding to the total thickness of the electrodes of the element is interposed is used. The same as that of the device 4, the effect that the position of the needle valve member does not change even if the temperature changes during use, the injection valve does not open or close, and the stroke amount does not change. Play.
【００３０】上述の実施例は、説明のために例示したも
ので、本発明としてはそれらに限定されるものでは無
く、特許請求の範囲、発明の詳細な説明および図面の記
載から当業者が認識することができる本発明の技術的思
想に反しない限り、変更および付加が可能である。The embodiments described above are merely examples for the purpose of explanation, and the present invention is not limited thereto, and those skilled in the art will recognize from the claims, the detailed description of the invention and the description of the drawings. Modifications and additions can be made without departing from the technical idea of the present invention.
【図１】本発明の第１実施例の圧電アクチュエータを適
用した燃料噴射弁を示す縦断面図である。FIG. 1 is a vertical cross-sectional view showing a fuel injection valve to which a piezoelectric actuator according to a first embodiment of the present invention is applied.
【図２】第１実施例の駆動回路を示すブロック図であ
る。FIG. 2 is a block diagram showing a drive circuit of a first embodiment.
【図３】第２実施例の圧電アクチュエータを適用した燃
料噴射弁を示す縦断面図である。FIG. 3 is a vertical cross-sectional view showing a fuel injection valve to which the piezoelectric actuator of the second embodiment is applied.
【図４】第３実施例の圧電アクチュエータを適用した燃
料噴射弁を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing a fuel injection valve to which the piezoelectric actuator of the third embodiment is applied.
【図５】従来装置を示す縦断面図である。FIG. 5 is a vertical cross-sectional view showing a conventional device.
【図６】従来装置の圧電装置を示す横断面図である。FIG. 6 is a cross-sectional view showing a piezoelectric device of a conventional device.
１ 弁本体 ２ ニードル弁部材 ３ スプリング部材 ４ 圧電装置 ５ 駆動回路 ６ ＥＦＩコンピュータ ７ 並設部材 １１ 小径部 １１Ｓ 弁座部 １２ 噴射口 １３ 第１の大径部 １４ 燃料導入口 １５ 蓋部 １６ 第２の大径部 ２０ インナバルブ ２１Ｔ Ｔ字部 ２１Ｎ 連結部 ２２ 第２部材 ２２Ｈ 穴部 ２２Ｐ 貫通穴 ２３ 第３部材 ２３Ｐ 平坦面 ２３Ｇ 溝 ２３Ｏ Ｏリング ２４、３０、４２ コイルスプリング ４０ 中実円筒体 ４１ スペーサ ４３ 係止部材 ５１ ＤＣ−ＤＣコンバータ ５２、５３ コンデンサ ５４ 切換スイッチ ７０ 圧電装置 ７１ セラミックス ７２ ステンレス Ｂ バッテリ ＩＧ イグニッションスイッチ 1 Valve Main Body 2 Needle Valve Member 3 Spring Member 4 Piezoelectric Device 5 Drive Circuit 6 EFI Computer 7 Side-by-Side Member 11 Small Diameter Part 11S Valve Seat 12 Injection Port 13 First Large Diameter 14 Fuel Inlet 15 Lid 16 2nd Large-diameter part 20 Inner valve 21T T-shaped part 21N Connecting part 22 Second member 22H Hole 22P Through hole 23 Third member 23P Flat surface 23G groove 23O O-ring 24, 30, 42 Coil spring 40 Solid cylindrical body 41 Spacer 43 Locking member 51 DC-DC converter 52, 53 Capacitor 54 Changeover switch 70 Piezoelectric device 71 Ceramics 72 Stainless steel B Battery IG Ignition switch
Claims (2)
向に付勢するスプリング部材と、 アクチュエータ本体内に介挿され、一端を可動部材に係
止するとともに他端をバネ部材に係止された係止部材に
係止された筒状体の圧電素子であって、印加される電圧
が制御されることにより可動部材を移動させる圧電装置
と、 係止部材とアクチュエータ本体との間に介挿され、圧電
装置に並設されたセラミックスより成る並設部材とから
成ることを特徴とする圧電アクチュエータ。1. A piezoelectric actuator main body, a movable member inserted in the actuator main body, a spring member inserted in the actuator main body and urging the movable member in one direction, and an intermediate member inserted in the actuator main body. A cylindrical piezoelectric element having one end locked to a movable member and the other end locked to a locking member locked to a spring member, which is movable by controlling the applied voltage. A piezoelectric actuator comprising: a piezoelectric device that moves a member; and a juxtaposed member made of ceramics that is interposed between a locking member and an actuator body and juxtaposed with the piezoelectric device.
向に付勢するスプリング部材と、 アクチュエータ本体内に介挿され、一端を可動部材に係
止するとともに他端をバネ部材に係止された係止部材に
係止された筒状体の圧電素子であって、印加される電圧
が制御されることにより可動部材を移動させる圧電装置
と、 係止部材とアクチュエータ本体との間に介挿され、圧電
装置に並設される第２の圧電装置で構成された並設部材
とから成ることを特徴とする圧電アクチュエータ。2. A piezoelectric actuator main body, a movable member inserted in the actuator main body, a spring member inserted in the actuator main body and urging the movable member in one direction, and an intermediate member inserted in the actuator main body. A cylindrical piezoelectric element having one end locked to a movable member and the other end locked to a locking member locked to a spring member, which is movable by controlling the applied voltage. A piezoelectric device comprising: a piezoelectric device that moves a member; and a juxtaposed member that is interposed between a locking member and an actuator body and that is a second piezoelectric device that is juxtaposed to the piezoelectric device. Actuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5154389A JPH06343273A (en) | 1993-05-31 | 1993-05-31 | Piezoelectric actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5154389A JPH06343273A (en) | 1993-05-31 | 1993-05-31 | Piezoelectric actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06343273A true JPH06343273A (en) | 1994-12-13 |
Family
ID=15583073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5154389A Pending JPH06343273A (en) | 1993-05-31 | 1993-05-31 | Piezoelectric actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06343273A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000065224A1 (en) * | 1999-04-27 | 2000-11-02 | Robert Bosch Gmbh | Fuel injection valve and method for activating the same |
| JP2003510508A (en) * | 1999-09-30 | 2003-03-18 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Valve for controlling liquid |
| DE102015119816A1 (en) * | 2015-11-17 | 2017-05-18 | V.I.E. Systems GmbH | Piezo actuator with several piezo elements |
-
1993
- 1993-05-31 JP JP5154389A patent/JPH06343273A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000065224A1 (en) * | 1999-04-27 | 2000-11-02 | Robert Bosch Gmbh | Fuel injection valve and method for activating the same |
| US6749126B1 (en) | 1999-04-27 | 2004-06-15 | Robert Bosch Gmbh | Fuel injector and method for its operation |
| JP2003510508A (en) * | 1999-09-30 | 2003-03-18 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Valve for controlling liquid |
| DE102015119816A1 (en) * | 2015-11-17 | 2017-05-18 | V.I.E. Systems GmbH | Piezo actuator with several piezo elements |
| WO2017085059A1 (en) | 2015-11-17 | 2017-05-26 | V.I.E. Systems GmbH | Piezo actuator with multiple piezo elements |
| DE102015119816B4 (en) | 2015-11-17 | 2019-07-25 | V.I.E. Systems GmbH | Piezo actuator with several piezo elements |
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| LAPS | Cancellation because of no payment of annual fees |