JP3274294B2 - Fuel injection timing detection device - Google Patents
Fuel injection timing detection deviceInfo
- Publication number
- JP3274294B2 JP3274294B2 JP25159994A JP25159994A JP3274294B2 JP 3274294 B2 JP3274294 B2 JP 3274294B2 JP 25159994 A JP25159994 A JP 25159994A JP 25159994 A JP25159994 A JP 25159994A JP 3274294 B2 JP3274294 B2 JP 3274294B2
- Authority
- JP
- Japan
- Prior art keywords
- spring
- ground plate
- piezoelectric element
- nozzle
- plate
- 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.)
- Expired - Fee Related
Links
- 238000002347 injection Methods 0.000 title claims description 37
- 239000007924 injection Substances 0.000 title claims description 37
- 238000001514 detection method Methods 0.000 title claims description 23
- 239000000446 fuel Substances 0.000 title claims description 21
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 description 13
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/24—Fuel-injection apparatus with sensors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、圧電素子を用いて燃
料噴射装置の噴射時期を検出する噴射時期検出装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection timing detecting device for detecting an injection timing of a fuel injection device using a piezoelectric element.
【０００２】[0002]
【従来の技術】従来のこの検出装置としては、特公昭６
３ー１４１８８号公報に記載のものがある。この検出装
置Ａは、図３に示すように、燃料噴射装置の装置本体ａ
のばね収納孔ｂ内に配置されており、圧電素子ｃと、こ
の圧電素子ｃの両側に配置された電極板ｄおよび接地板
ｅとを備えている。接地板ｅは、シムｆを介してノズル
ばねｇの一端部に接しており、ノズルばねｇの押圧力が
シムｆおよび接地板ｅを介して圧電素子ｃに作用するよ
うになっている。一方、電極板ｄは、ばね収納孔ｂの底
面に絶縁部材ｈを介して接している。なお、ノズルばね
ｇの他端部には、針弁（図示せず）が接している。2. Description of the Related Art As a conventional detecting device, Japanese Patent Publication No. Sho 6
There is one described in JP-A-3-14188. As shown in FIG. 3, the detection device A is a device main body a of the fuel injection device.
, A piezoelectric element c, and an electrode plate d and a ground plate e disposed on both sides of the piezoelectric element c. The ground plate e is in contact with one end of the nozzle spring g via the shim f, and the pressing force of the nozzle spring g acts on the piezoelectric element c via the shim f and the ground plate e. On the other hand, the electrode plate d is in contact with the bottom surface of the spring housing hole b via the insulating member h. A needle valve (not shown) is in contact with the other end of the nozzle spring g.
【０００３】上記構成の噴射時期検出装置において、針
弁が弁座からリフトすると、ノズルばねｇによる圧電素
子ｃに対する押圧力が変化し、これに伴って圧電素子ｃ
の出力電圧が変化する。この出力電圧の変化によって針
弁のリフト時期を検出し、ひいては燃料の噴射時期を検
出することができる。In the above-described injection timing detecting device, when the needle valve lifts from the valve seat, the pressing force on the piezoelectric element c by the nozzle spring g changes, and accordingly, the piezoelectric element c
Output voltage changes. From the change in the output voltage, the lift timing of the needle valve can be detected, and thus the fuel injection timing can be detected.
【０００４】ところで、接地板ｅについては、本体ａに
確実に接地するために、ばね収納孔ｂの内周面に密に接
触させる必要がある。そこで、上記の検出装置において
は、図４に示すように、接地板ｅの外周面に複数の突起
ｅ1を形成し、この突起ｅ1がばね収納孔ｂの内周面に変
形した状態で接触するようにして接地板ｅをばね収納孔
ｂに圧入するようにしている。Incidentally, the ground plate e must be in close contact with the inner peripheral surface of the spring receiving hole b in order to reliably ground the main body a. Therefore, in the above detecting apparatus, as shown in FIG. 4, in a state in which forming a plurality of protrusions e 1 on the outer peripheral surface of the ground plate e, deformed into the inner peripheral surface of the projection e 1 spring receiving hole b The grounding plate e is pressed into the spring receiving hole b so as to be in contact with the spring receiving hole b.
【０００５】[0005]
【発明が解決しようとする課題】ところが、接地板ｅを
ばね収納孔ｂに圧入するには多大の力を要する。このた
め、検出装置Ａのばね収納孔ｂへの組み込みが困難にな
るという問題があった。また、ノズルばねｆから圧電素
子ｃに作用する押圧力が接地板ｅとばね収納孔ｂの内周
面との間の摩擦力によって減少させられ、検出精度が悪
化するという問題があった。However, a large amount of force is required to press the ground plate e into the spring receiving hole b. For this reason, there has been a problem that it is difficult to incorporate the detection device A into the spring storage hole b. Further, the pressing force acting on the piezoelectric element c from the nozzle spring f is reduced by the frictional force between the ground plate e and the inner peripheral surface of the spring receiving hole b, and there is a problem that the detection accuracy is deteriorated.
【０００６】[0006]
【課題を解決するための手段】この発明は、上記問題を
解決するためになされたもので、請求項１に係る発明
は、針弁を弁座側に付勢するノズルばねとこのノズルば
ねを収納するばね収納孔の底面との間に配置され、圧電
素子と、この圧電素子の両側に配置された電極板および
接地板とを備えた燃料噴射装置の噴射時期検出装置にお
いて、上記電極板をノズルばね側に配置し、上記接地板
を上記ばね収納孔の底面に接触させて配置し、上記ばね
収納孔の底面と上記接地板との各接触面を互いに嵌合す
るテーパ面に形成したことを特徴としている。また、請
求項２に係る発明は、針弁を弁座側に付勢するノズルば
ねとこのノズルばねを収納するばね収納孔の底面との間
に配置され、圧電素子と、この圧電素子の両側に配置さ
れた電極板および接地板とを備えた燃料噴射装置の噴射
時期検出装置において、上記電極板をノズルばね側に配
置し、上記接地板を上記ばね収納孔の底面に接触させて
配置し、上記圧電素子と上記電極板と上記接地板とを、
上記ばね収納孔の底面に対する上記接地板の接触面を除
き、絶縁性樹脂によって被覆して一体化したことを特徴
としている。請求項１，２に係る発明においては、上記
圧電素子と上記電極板および上記接地板とを導電性接着
剤によってそれぞれ接着固定することが望ましい。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the invention according to claim 1 is a nozzle spring for urging a needle valve to a valve seat side and a nozzle spring. In an injection timing detection device for a fuel injection device, which is disposed between a bottom surface of a spring storage hole for storing and a piezoelectric element, and an electrode plate and a ground plate disposed on both sides of the piezoelectric element, It is arranged on the nozzle spring side, the ground plate is arranged in contact with the bottom surface of the spring storage hole, and each contact surface between the bottom surface of the spring storage hole and the ground plate is formed as a tapered surface that fits each other. It is characterized by. According to a second aspect of the present invention, there is provided a piezoelectric element disposed between a nozzle spring for urging a needle valve toward a valve seat and a bottom surface of a spring accommodating hole for accommodating the nozzle spring. In an injection timing detection device for a fuel injection device including an electrode plate and a ground plate disposed on the nozzle, the electrode plate is disposed on a nozzle spring side, and the ground plate is disposed in contact with a bottom surface of the spring housing hole. The piezoelectric element, the electrode plate and the ground plate,
Except for the contact surface of the ground plate with the bottom surface of the spring storage hole, the spring cover is covered with an insulating resin and integrated. In the inventions according to the first and second aspects, it is preferable that the piezoelectric element, the electrode plate, and the ground plate are bonded and fixed to each other with a conductive adhesive.
【０００７】[0007]
【作用】請求項１に係る発明においては、接地板をばね
収納孔の底面に接触させているから、接地板をばね収納
孔に圧入する必要がない。また、接地板がノズルばねに
よってばね収納孔の底面に押しつけられるので、接地板
と底面とは電気的に確実に接続される。しかも、接地板
とノズル収納孔の底面とは、テーパ面の楔作用により、
より一層強く押しつけられる。したがって、接地板とノ
ズル収納孔の底面とが電気的により一層確実に接続され
る。また、テーパ面の求心作用により、接地板が位置固
定される。したがって、接地板に圧電素子および電極板
を固定することにより、接地板のみならず、圧電素子お
よび電極板がばね収納孔の内周面に接触して摩耗したり
破損したりすることが防止される。請求項２に係る発明
においても、接地板をばね収納孔の底面に接触させてい
るから、接地板をばね収納孔に圧入する必要がなく、し
かも接地板がノズルばねによってばね収納孔の底面に押
しつけられるので、接地板と底面とは電気的に確実に接
続される。また、圧電素子、電極板および接地板を一体
に取り扱うことができるので、検出装置をばね収納孔に
より一層容易に組み込むことができる。さらに、圧電素
子および電極板がばね収納孔の内周面等に接触するのを
絶縁性樹脂が防止する。請求項３に係る発明において
は、圧電素子と電極板との間、および圧電素子と接地板
との間が導電性接着剤によって電気的に確実に接続され
る。また、圧電素子、電極板および接地板を一体に取り
扱うことができるので、検出装置をばね収納孔により一
層容易に組み込むことができる。特に、請求項２に係る
発明のように、絶縁性樹脂を圧電素子、電極板および接
地板と一体にモールド成形する場合には、圧電素子、電
極板および接地板を一体的に取り扱うことができるの
で、成形を容易に行うことができる。According to the first aspect of the present invention, since the ground plate is in contact with the bottom surface of the spring receiving hole, it is not necessary to press-fit the ground plate into the spring receiving hole. Further, since the ground plate is pressed against the bottom surface of the spring housing hole by the nozzle spring, the ground plate and the bottom surface are electrically connected securely. Moreover, the ground plate and the bottom surface of the nozzle receiving hole are formed by the wedge action of the tapered surface.
Pressed even stronger. Therefore, the ground plate and the bottom surface of the nozzle receiving hole are electrically connected more reliably. In addition, the ground plate is fixed in position by the centripetal action of the tapered surface. Therefore, by fixing the piezoelectric element and the electrode plate to the ground plate, it is possible to prevent not only the ground plate but also the piezoelectric element and the electrode plate from contacting the inner peripheral surface of the spring accommodating hole to be worn or damaged. You. Also in the invention according to claim 2, since the ground plate is in contact with the bottom surface of the spring receiving hole, there is no need to press-fit the ground plate into the spring receiving hole, and the ground plate is provided on the bottom surface of the spring receiving hole by the nozzle spring. Since it is pressed, the ground plate and the bottom surface are electrically reliably connected. In addition, since the piezoelectric element, the electrode plate, and the ground plate can be handled integrally, the detection device can be more easily incorporated into the spring receiving hole. Further, the insulating resin prevents the piezoelectric element and the electrode plate from contacting the inner peripheral surface of the spring housing hole. In the invention according to claim 3, the piezoelectric element and the electrode plate and the piezoelectric element and the ground plate are electrically reliably connected by the conductive adhesive. In addition, since the piezoelectric element, the electrode plate, and the ground plate can be handled integrally, the detection device can be more easily incorporated into the spring receiving hole. In particular, when the insulating resin is molded integrally with the piezoelectric element, the electrode plate, and the ground plate as in the invention according to claim 2, the piezoelectric element, the electrode plate, and the ground plate can be integrally handled. Therefore, molding can be easily performed.
【０００８】[0008]
【実施例】以下、この発明の一実施例について図１およ
び図２を参照して説明する。図１はこの発明に係る噴射
時期検出装置１を備えた燃料噴射装置２の縦断面図であ
り、燃料噴射装置２自体は従来のものと同様に構成され
ている。そこで、燃料噴射装置２について簡単に説明す
ると、符号２１は装置本体たるノズルホルダである。こ
のノズルホルダ２１の下端面にはばね収納孔２２が形成
されており、ばね収納孔２２にはノズルばね２３が配置
されている。また、ノズルホルダ２１の下端面には、ス
ペーサ２４およびノズル２５が順次配置され、ノズルナ
ット２６によって固定されている。そして、ノズルホル
ダ２１、スペーサ２４にわたって形成された高圧通路２
７を介してノズル２５に燃料が圧送されると、針弁２８
がノズルばね２３の付勢力に抗してリフトし、噴射孔
（図示せず）から燃料が噴射されるようになっている。
勿論、燃料の圧送が中断すると、針弁２８がノズルばね
２３によって弁座（図示せず）に着座させられる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of a fuel injection device 2 provided with an injection timing detection device 1 according to the present invention, and the fuel injection device 2 itself is configured similarly to a conventional one. Therefore, the fuel injection device 2 will be briefly described. Reference numeral 21 denotes a nozzle holder as a main body of the device. A spring housing hole 22 is formed in the lower end surface of the nozzle holder 21, and a nozzle spring 23 is arranged in the spring housing hole 22. Further, a spacer 24 and a nozzle 25 are sequentially arranged on the lower end surface of the nozzle holder 21 and fixed by a nozzle nut 26. Then, the high-pressure passage 2 formed over the nozzle holder 21 and the spacer 24
When fuel is pumped through the nozzle 25 through the nozzle 7, the needle valve 28
Is lifted against the urging force of the nozzle spring 23, and fuel is injected from an injection hole (not shown).
Of course, when the pumping of the fuel is interrupted, the needle valve 28 is seated on the valve seat (not shown) by the nozzle spring 23.
【０００９】また、ノズルホルダ２１には、ばね収納孔
２２の底面の中央部から上方へ延びる縦孔２９が形成さ
れるとともに、縦孔２９の上端部から横方向に延びてノ
ズルホルダ２１の一側部外周面に開口する横孔３０が形
成されている。この横孔３０の開口部には、コネクタ３
１が固定されている。コネクタ３１の端子３２が横孔３
０を貫通して縦孔２９まで延びており、図２に示すよう
に、端子３２の先端部はフォーク状に形成されている。A vertical hole 29 is formed in the nozzle holder 21 so as to extend upward from the center of the bottom surface of the spring receiving hole 22 and extends laterally from the upper end of the vertical hole 29 so as to extend one side of the nozzle holder 21. A lateral hole 30 is formed in the outer peripheral surface of the side portion. The opening of the lateral hole 30 has a connector 3
1 is fixed. Terminal 32 of connector 31 is horizontal hole 3
0, it extends to the vertical hole 29, and as shown in FIG. 2, the tip of the terminal 32 is formed in a fork shape.
【００１０】上記噴射時期検出装置１は、ばね収納孔２
２の底面とノズルばね２３との間に配置されており、ノ
ズルばね２３によりシム３３を介して押圧され、ばね収
納孔２２の底面に押圧接触させられている。The above-described injection timing detecting device 1 includes a spring housing hole 2
The nozzle spring 23 is disposed between the bottom surface of the spring 2 and the nozzle spring 23, and is pressed through the shim 33 by the nozzle spring 23, and is brought into contact with the bottom surface of the spring housing hole 22.
【００１１】また、検出装置１は、圧電素子１１、電極
板１２、接地板１３および絶縁部材１４を備えている。
圧電素子１１は、正極側の端面をノズルばね２３側に向
け、負極側の端面をばね収納孔２２の底面側に向けて配
置されている。The detecting device 1 includes a piezoelectric element 11, an electrode plate 12, a ground plate 13, and an insulating member 14.
The piezoelectric element 11 is arranged such that the end face on the positive electrode side faces the nozzle spring 23 side and the end face on the negative electrode side faces the bottom face side of the spring housing hole 22.
【００１２】圧電素子１１の正極側の端面には、電極板
１２が導電性を有する接着剤（図示せず）によって接着
固定されている。接着剤としては、例えば銀粉配合のエ
ポキシ樹脂系接着剤が用いられる。電極板１２の中央部
には、端子棒１２ａが形成されている。この端子棒１２
ａは、圧電素子１１の孔１１ａおよび接地板１３の孔１
３ａを貫通して縦孔２９内に延びており、その先端部
は、図２に示すように、端子３２に挟持され、これによ
ってコネクタ３１に電気的に接続されている。勿論、コ
ネクタ３１は、マイクロコンピュータ（図示せず）に接
続されており、圧電素子１１の出力電圧がマイクロコン
ピュータに入力されるようになっている。 なお、端子棒１２ａと孔１１ａおよび１３ａの内周面と
の間には隙間が形成されており、これによってそれらの
間が絶縁されている。勿論、隙間に絶縁材を充填しても
よい。An electrode plate 12 is bonded and fixed to the positive electrode side end surface of the piezoelectric element 11 with a conductive adhesive (not shown). As the adhesive, for example, an epoxy resin-based adhesive containing silver powder is used. At the center of the electrode plate 12, a terminal rod 12a is formed. This terminal rod 12
a is the hole 11 a of the piezoelectric element 11 and the hole 1 of the ground plate 13.
As shown in FIG. 2, the distal end portion is sandwiched between terminals 32, and is electrically connected to the connector 31. Of course, the connector 31 is connected to a microcomputer (not shown), and the output voltage of the piezoelectric element 11 is input to the microcomputer. Note that a gap is formed between the terminal rod 12a and the inner peripheral surfaces of the holes 11a and 13a, thereby insulating them from each other. Of course, the gap may be filled with an insulating material.
【００１３】上記圧電素子１１の負極側の端面には、接
地板１３が上記と同様の導電性接着剤によって接着固定
されている。この接地板１３の上面の外周側部分には、
先細りのテーパ面１３ｂが形成されている。一方、ばね
収納孔２２の底面には、テーパ面１３ｂに対応したテー
パ面２２ａが形成されている。そして、接地板１３がノ
ズルばね２３によって押圧されることにより、テーパ面
１３ｂ，２２ａが互いに嵌合させられている。これによ
って、接地板１３ｂがノズルホルダ２１に電気的に確実
に接続されている。なお、接地板１３にテーパ面２２ａ
のようなテーパ孔状のテーパ面を形成し、ばね収納孔２
２の底面にテーパ面１３ｂのようなテーパ面を形成して
もよい。A ground plate 13 is bonded and fixed to the end face of the piezoelectric element 11 on the negative electrode side by the same conductive adhesive as described above. On the outer peripheral side portion of the upper surface of the ground plate 13,
A tapered tapered surface 13b is formed. On the other hand, a tapered surface 22a corresponding to the tapered surface 13b is formed on the bottom surface of the spring housing hole 22. When the ground plate 13 is pressed by the nozzle spring 23, the tapered surfaces 13b and 22a are fitted to each other. This ensures that the ground plate 13b is electrically connected to the nozzle holder 21 reliably. The ground plate 13 has a tapered surface 22a.
A tapered surface of a tapered hole shape as shown in FIG.
A tapered surface such as the tapered surface 13b may be formed on the bottom surface of the second member.
【００１４】上記絶縁部材１４は、ＰＡ（ポリアミド）
６６のガラス繊維強化品、またはＰＰＳ（ポリフェニリ
ンサルファイド）のガラス繊維強化品等の強度および耐
熱性に富んだ絶縁性の樹脂を有底円筒状に成形してなる
ものであり、内部に順次収納された電極板１２、圧電素
子１１および接地板１３を一体的に保持するとともに、
電極板１２の下端面および外周面、並びに圧電素子１１
の外周面を被覆してノズルホルダ２１およびシム３３に
対して絶縁している。The insulating member 14 is made of PA (polyamide)
66 made of an insulating resin having high strength and heat resistance, such as a glass fiber reinforced product of No. 66 or a glass fiber reinforced product of PPS (polyphenylene sulfide). While holding the housed electrode plate 12, piezoelectric element 11 and ground plate 13 integrally,
Lower end surface and outer peripheral surface of electrode plate 12 and piezoelectric element 11
Is insulated from the nozzle holder 21 and the shim 33 by covering the outer peripheral surface of the nozzle holder 21.
【００１５】なお、絶縁部材１４を成形するに際して
は、金型に電極板１２、圧電素子１１および接地板１４
をセットした状態でモールド成形することができる。こ
の場合、電極板１２、圧電素子１１および接地板１４を
予め導電性接着剤で接着固定しておくと、それらの取り
扱いが容易である。When the insulating member 14 is formed, the electrode plate 12, the piezoelectric element 11, and the ground plate 14 are formed in a mold.
Can be molded in a state where is set. In this case, if the electrode plate 12, the piezoelectric element 11, and the ground plate 14 are bonded and fixed in advance with a conductive adhesive, they can be easily handled.
【００１６】また、絶縁部材１４がばね収納孔２２に接
触すると、摩耗および破損の原因となりうるため、絶縁
部材１４の外径はばね収納孔２２の内径より小さくする
必要がある。この場合、絶縁部材１４とばね収納孔２２
の内周面との間に隙間ができるが、テーパ面１３ｂ，２
２ａの嵌合によって検出装置１全体が位置固定されるの
で、振動等によって検出装置１がガタつくことはない。Further, if the insulating member 14 comes into contact with the spring receiving hole 22, it may cause wear and breakage. Therefore, the outer diameter of the insulating member 14 needs to be smaller than the inner diameter of the spring receiving hole 22. In this case, the insulating member 14 and the spring accommodation hole 22
There is a gap between the tapered surfaces 13b and 2b.
Since the entire detection device 1 is fixed in position by the fitting of 2a, the detection device 1 does not rattle due to vibration or the like.
【００１７】上記構成の噴射時期検出装置１において
は、接地板１３がノズルばね２３によってばね収納孔２
２の底面に押圧接触させられているから、接地板１３を
ノズルホルダ２１に電気的に確実に接続することができ
る。特に、この実施例では接地板１３と底面とをテーパ
嵌合させているから、両者をより一層強力に接触させる
ことができる。In the injection timing detecting device 1 having the above-described structure, the ground plate 13 is connected to the spring housing hole 2 by the nozzle spring 23.
Since the bottom plate 2 is pressed against the bottom surface, the ground plate 13 can be electrically and reliably connected to the nozzle holder 21. In particular, in this embodiment, since the ground plate 13 and the bottom surface are taperedly fitted, both can be more strongly contacted.
【００１８】また、接地板１３をばね収納孔２２の底面
に接触させているから、ばね収納孔２２に圧入する必要
がない。したがって、検出装置１をばね収納孔２２に容
易に組み込むことができる。特に、この実施例において
は、圧電素子１１、電極板１２および接地板１３を一体
化しているので、より一層容易に組み込むことができ
る。また、接地板１３を圧入していないので、ノズルば
ね２３の押圧力がそのまま圧電素子１１に作用する。し
たがって、検出精度が低下するのを防止することができ
る。Further, since the ground plate 13 is in contact with the bottom surface of the spring housing hole 22, there is no need to press-fit the spring housing hole 22. Therefore, the detection device 1 can be easily incorporated into the spring storage hole 22. In particular, in this embodiment, since the piezoelectric element 11, the electrode plate 12, and the ground plate 13 are integrated, they can be incorporated more easily. Further, since the ground plate 13 is not press-fitted, the pressing force of the nozzle spring 23 acts on the piezoelectric element 11 as it is. Therefore, it is possible to prevent the detection accuracy from lowering.
【００１９】また、圧電素子１１と電極板１２および接
地板１３とを接着固定すると、仮に圧電素子１１、電極
板１２、および接地板１３の互いの接触面にうねり等が
あって平面度が悪く、それらが接触面の一部においての
み接触し、他の部分に隙間が生じるような場合であって
も、その隙間を接着剤が埋めるので、接触面積を大きく
して接触面間の面圧を低くすることができ、これによっ
て圧電素子１１が割れるような不具合を未然に防止する
ことができる。Further, if the piezoelectric element 11, the electrode plate 12, and the ground plate 13 are bonded and fixed, the contact surfaces of the piezoelectric element 11, the electrode plate 12, and the ground plate 13 may be undulated and the flatness may be poor. However, even when they contact only part of the contact surface and a gap occurs in the other part, the gap is filled with the adhesive, so that the contact area is increased and the surface pressure between the contact surfaces is reduced. It is possible to prevent the piezoelectric element 11 from cracking.
【００２０】さらに、絶縁部材１４を圧電素子１１、電
極板１２および接地板１３と一体に成形した場合には、
仮に圧電素子１１、電極１２および接地板１３の各端面
がテーパ面１３ｂ（２２ａ）の軸線との直角度が悪く、
絶縁部材１４が設けられないときにはノズルばね２３が
シム３３の一部にのみ接触するものであったとしても、
テーパ面１３ｂの軸線に対する絶縁部材１４の下端面の
直角度の精度を向上させることにより、ノズルばね２３
の片当たりを防止することができ、これによって圧電素
子１１の割れを防止することができる。Further, when the insulating member 14 is formed integrally with the piezoelectric element 11, the electrode plate 12, and the ground plate 13,
If the respective end faces of the piezoelectric element 11, the electrode 12, and the ground plate 13 have a bad perpendicularity to the axis of the tapered surface 13b (22a),
When the insulating member 14 is not provided, even if the nozzle spring 23 contacts only a part of the shim 33,
By improving the accuracy of the perpendicularity of the lower end surface of the insulating member 14 to the axis of the tapered surface 13b, the nozzle spring 23
Of the piezoelectric element 11 can be prevented.
【００２１】[0021]
【効果】以上説明したように、請求項１に係る発明によ
れば、接地板を燃料噴射装置の装置本体に確実に接触さ
せることができるのは勿論のこと、接地板をばね収納孔
に圧入する必要がないので、噴射時期検出装置をばね収
納孔に容易に組み込むことができ、しかも検出精度が低
下するのを防止することができる。また、テーパ面の楔
作用により、接地板と装置本体とをより一層確実に接触
させることができ、さらにテーパ面の求心作用により、
検出装置全体を位置することができ、検出装置がばね収
納孔の内周面に接触して摩耗したり破損したりするのを
防止することができるとともに、端子棒にフォーク状先
端を有する端子との接触状態もより安定したものにする
ことができる。また、請求項２に係る発明によれば、請
求項１に係る発明と同様に、接地板を燃料噴射装置の装
置本体に確実に接触させることができるとともに、接地
板をばね収納孔に圧入する必要がないので、噴射時期検
出装置をばね収納孔に容易に組み込むことができ、しか
も検出精度が低下するのを防止することができる。ま
た、圧電素子、電極板および接地板を一体に取り扱うこ
とができるので、検出装置をばね収納孔により一層容易
に組み込むことができる。さらに、圧電素子および電極
板がばね収納孔の内周面等に接触するのを絶縁性樹脂に
よって防止することができる。さらに、請求項３に係る
発明によれば、圧電素子、電極板および接地板を一体に
取り扱うことができるので、検出装置をばね収納孔によ
り一層容易に組み込むことができ、しかも圧電素子の割
れを防止することができる。As described above, according to the first aspect of the present invention, the ground plate can be surely brought into contact with the device body of the fuel injection device, and the ground plate can be pressed into the spring receiving hole. Therefore, the injection timing detecting device can be easily incorporated in the spring receiving hole, and the detection accuracy can be prevented from lowering. Also, the wedge action of the tapered surface allows the ground plate and the device main body to be more reliably brought into contact with each other.
The entire detection device can be located, the detection device can be prevented from being worn or damaged by contacting the inner peripheral surface of the spring housing hole, and a terminal having a fork-like tip on the terminal rod. Can be made more stable. According to the second aspect of the invention, similarly to the first aspect, the ground plate can be reliably brought into contact with the device main body of the fuel injection device, and the ground plate is pressed into the spring housing hole. Since there is no need, the injection timing detecting device can be easily incorporated into the spring housing hole, and the detection accuracy can be prevented from being reduced. In addition, since the piezoelectric element, the electrode plate, and the ground plate can be handled integrally, the detection device can be more easily incorporated into the spring receiving hole. Further, the piezoelectric element and the electrode plate can be prevented from coming into contact with the inner peripheral surface of the spring housing hole or the like by the insulating resin. Further, according to the third aspect of the present invention, since the piezoelectric element, the electrode plate, and the ground plate can be integrally handled, the detecting device can be more easily incorporated into the spring receiving hole, and cracks in the piezoelectric element can be reduced. Can be prevented.
【図１】この発明の一実施例を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.
【図２】同実施例の電極板の端子棒とコネクタの端子と
の接続状態を示す図１のＡ矢視拡大図である。FIG. 2 is an enlarged view as viewed from an arrow A in FIG. 1 showing a connection state between a terminal rod of an electrode plate and a terminal of a connector according to the embodiment.
【図３】従来の噴射時期検出装置の一例を示す断面図で
ある。FIG. 3 is a cross-sectional view illustrating an example of a conventional injection timing detection device.
【図４】同装置に用いられている接地板の拡大平面図で
ある。FIG. 4 is an enlarged plan view of a ground plate used in the device.
１ 噴射時期検出装置 ２ 燃料噴射装置 １１ 圧電素子 １２ 電極板 １３ 接地板 １３ｂ テーパ面 １４ 絶縁部材 ２１ ノズルホルダ（燃料噴射装置の装置本体） ２２ ばね収納孔 ２２ａ テーパ面 ２３ ノズルばね DESCRIPTION OF SYMBOLS 1 Injection timing detecting device 2 Fuel injection device 11 Piezoelectric element 12 Electrode plate 13 Ground plate 13b Tapered surface 14 Insulating member 21 Nozzle holder (device main body of fuel injection device) 22 Spring storage hole 22a Tapered surface 23 Nozzle spring
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 実開 平３−42066（ＪＰ，Ｕ) 実開 昭60−190975（ＪＰ，Ｕ) 実開 昭60−183270（ＪＰ，Ｕ) 実開 昭61−173775（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F02M 65/00 301 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 3-42066 (JP, U) JP-A 60-190975 (JP, U) JP-A 60-183270 (JP, U) JP-A 61- 173775 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F02M 65/00 301
Claims (3)
のノズルばねを収納するばね収納孔の底面との間に配置
され、圧電素子と、この圧電素子の両側に配置された電
極板および接地板とを備えた燃料噴射装置の噴射時期検
出装置において、上記電極板をノズルばね側に配置し、
上記接地板を上記ばね収納孔の底面に接触させて配置
し、上記ばね収納孔の底面と上記接地板との各接触面を
互いに嵌合するテーパ面に形成したことを特徴とする燃
料噴射装置の噴射時期検出装置。1. A piezoelectric element disposed between a nozzle spring for urging a needle valve toward a valve seat and a bottom surface of a spring receiving hole for storing the nozzle spring, and electrodes disposed on both sides of the piezoelectric element. In an injection timing detection device for a fuel injection device including a plate and a ground plate, the electrode plate is disposed on a nozzle spring side,
The ground plate is disposed in contact with the bottom surface of the spring storage hole, and each contact surface between the bottom surface of the spring storage hole and the ground plate is arranged.
An injection timing detection device for a fuel injection device, wherein the injection timing detection device is formed on tapered surfaces that fit together .
のノズルばねを収納するばね収納孔の底面との間に配置
され、圧電素子と、この圧電素子の両側に配置された電
極板および接地板とを備えた燃料噴射装置の噴射時期検
出装置において、上記電極板をノズルばね側に配置し、
上記接地板を上記ばね収納孔の底面に接触させて配置
し、上記圧電素子と上記電極板と上記接地板とを、上記
ばね収納孔の底面に対する上記接地板の接触面を除き、
絶縁性樹脂によって被覆して一体化したことを特徴とす
る燃料噴射装置の噴射時期検出装置。2. A piezoelectric element disposed between a nozzle spring for urging a needle valve toward a valve seat and a bottom surface of a spring receiving hole for storing the nozzle spring, and electrodes disposed on both sides of the piezoelectric element. In an injection timing detection device for a fuel injection device including a plate and a ground plate, the electrode plate is disposed on a nozzle spring side,
The ground plate is disposed in contact with the bottom surface of the spring receiving hole, and the piezoelectric element, the electrode plate, and the ground plate are
Except for the contact surface of the ground plate with the bottom surface of the spring receiving hole,
An injection timing detecting device for a fuel injection device, wherein the device is covered with an insulating resin and integrated .
地板とを導電性接着剤によってそれぞれ接着固定したこ
とを特徴とする請求項１又は２に記載の燃料噴射装置の
噴射時期検出装置。3. The injection timing detecting device for a fuel injection device according to claim 1, wherein the piezoelectric element, the electrode plate, and the ground plate are bonded and fixed with a conductive adhesive.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25159994A JP3274294B2 (en) | 1994-09-21 | 1994-09-21 | Fuel injection timing detection device |
| DE1995613604 DE69513604T2 (en) | 1994-09-21 | 1995-09-07 | Fuel injector |
| EP19950306276 EP0703363B1 (en) | 1994-09-21 | 1995-09-07 | Fuel injection device |
| KR1019950030206A KR0168982B1 (en) | 1994-09-21 | 1995-09-15 | Fuel injection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25159994A JP3274294B2 (en) | 1994-09-21 | 1994-09-21 | Fuel injection timing detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0893602A JPH0893602A (en) | 1996-04-09 |
| JP3274294B2 true JP3274294B2 (en) | 2002-04-15 |
Family
ID=17225221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25159994A Expired - Fee Related JP3274294B2 (en) | 1994-09-21 | 1994-09-21 | Fuel injection timing detection device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0703363B1 (en) |
| JP (1) | JP3274294B2 (en) |
| KR (1) | KR0168982B1 (en) |
| DE (1) | DE69513604T2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10228353A1 (en) * | 2002-06-25 | 2004-01-15 | Daimlerchrysler Ag | Piezo sensor system for detecting the needle lift of an injection nozzle of a common rail injector |
| DE102007008617A1 (en) * | 2007-02-22 | 2008-08-28 | Robert Bosch Gmbh | Injector with sensor module and injection system |
| AU2009337337B2 (en) | 2009-01-19 | 2012-11-15 | Hochiki Corporation | Atomization Cooling Equipment and Atomizing Method |
| DE102013225386A1 (en) * | 2013-12-10 | 2015-06-11 | Robert Bosch Gmbh | Sensor device for force or pressure detection, method for producing a sensor device and fuel injector with a sensor device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56113044A (en) * | 1980-02-13 | 1981-09-05 | Nissan Motor Co Ltd | Injection timing sensor |
| US4662564A (en) * | 1984-05-15 | 1987-05-05 | Diesel Kiki Co., Ltd. | Fuel injection nozzle with timing sensor |
| JPS6314188A (en) | 1986-07-05 | 1988-01-21 | 日立電子エンジニアリング株式会社 | Information projector |
| JPH0447163A (en) | 1990-06-13 | 1992-02-17 | Mitsubishi Electric Corp | Auxiliary air control device for engine |
-
1994
- 1994-09-21 JP JP25159994A patent/JP3274294B2/en not_active Expired - Fee Related
-
1995
- 1995-09-07 DE DE1995613604 patent/DE69513604T2/en not_active Expired - Fee Related
- 1995-09-07 EP EP19950306276 patent/EP0703363B1/en not_active Expired - Lifetime
- 1995-09-15 KR KR1019950030206A patent/KR0168982B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0703363A2 (en) | 1996-03-27 |
| EP0703363B1 (en) | 1999-12-01 |
| DE69513604T2 (en) | 2000-07-13 |
| DE69513604D1 (en) | 2000-01-05 |
| KR0168982B1 (en) | 1999-01-15 |
| JPH0893602A (en) | 1996-04-09 |
| EP0703363A3 (en) | 1996-12-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |