JP2003090242A - Knocking detector for internal combustion engine - Google Patents
Knocking detector for internal combustion engineInfo
- Publication number
- JP2003090242A JP2003090242A JP2001284976A JP2001284976A JP2003090242A JP 2003090242 A JP2003090242 A JP 2003090242A JP 2001284976 A JP2001284976 A JP 2001284976A JP 2001284976 A JP2001284976 A JP 2001284976A JP 2003090242 A JP2003090242 A JP 2003090242A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- support member
- detection
- knocking
- insertion hole
- 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.)
- Granted
Links
Landscapes
- Testing Of Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関に発生し
たノッキングを検出するノッキング検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knocking detection device for detecting knocking generated in an internal combustion engine.
【０００２】[0002]
【従来の技術】従来ノッキング検出装置としては、様々
な種類が存在するが、そのうちの一つに、内燃機関のシ
リンダヘットに装着するタイプがある。この種のノッキ
ング検出装置は、一般に、外周に雄ネジ部が形成された
内燃機関に取り付け可能な挿通孔を有した本体部と、そ
の雄ネジ部の切り終わりよりも軸方向下方にて外側に張
り出した鍔部とを有した支持部材を備えている。2. Description of the Related Art There are various types of conventional knock detection devices, and one of them is a type that is mounted on a cylinder head of an internal combustion engine. This type of knocking detection device generally has a main body portion having an insertion hole that can be attached to an internal combustion engine having a male screw portion formed on the outer circumference, and an outer portion axially below the end of cutting the male screw portion. A supporting member having a projecting collar portion is provided.
【０００３】この支持部材は、鍔部の上に圧電材料から
なる検出素子と金属製材料からなる錘が載置されてお
り、錘に一定の圧力を加えつつ検出素子と錘を固定する
ために、上部から座金とナットにより締め付けられてい
る。尚、検出素子と錘は、支持部材の本体部を挿通する
ための挿通孔を有している。In this support member, a detection element made of a piezoelectric material and a weight made of a metal material are placed on a flange portion, and in order to fix the detection element and the weight while applying a constant pressure to the weight. , It is fastened with washers and nuts from the top. The detection element and the weight have insertion holes for inserting the main body of the support member.
【０００４】また、このノッキング検出装置は、検出素
子からの信号を外部に引き出すために、検出素子と支持
部材の鍔部との間及び、検出素子と錘との間に配置され
た検出電極を備え、更にこれら全てを外側から保護する
カバーを備えている。このようにして構成されたノッキ
ング検出装置は、内燃機関のシリンダヘッドに、ボルト
を用いて支持部材の挿通孔に通して締め付ける等の方法
で装着して使用される。Further, in this knocking detection device, in order to extract a signal from the detection element to the outside, a detection electrode disposed between the detection element and the collar portion of the support member and between the detection element and the weight is provided. It also has a cover that protects all of them from the outside. The knocking detection device configured as described above is used by being attached to a cylinder head of an internal combustion engine by a method such as tightening by using a bolt through an insertion hole of a support member.
【０００５】[0005]
【発明が解決しようとする課題】このように従来のノッ
キング検出装置は、支持部材、検出素子、検出電極、
錘、座金及びナットというように多数の部品により構成
されており、またこれらを決められた順に載置し適当な
加重をかけて固定する必要があるため、組立にも手間を
要した。したがって従来のノッキング検出装置には、コ
スト高を招く問題があった。As described above, the conventional knocking detection device includes the support member, the detection element, the detection electrode,
It is composed of a large number of parts such as a weight, a washer, and a nut, and it is necessary to place these in a predetermined order and fix them by applying an appropriate weight, so that it takes time to assemble. Therefore, the conventional knocking detection device has a problem of high cost.
【０００６】そこで本発明では、従来のノッキング検出
装置に比較し、部品点数を減らし、組立の手間を軽減
し、ひいてはコストが抑えられた内燃機関のノッキング
検出装置を提供することを目的とする。Therefore, it is an object of the present invention to provide a knocking detection device for an internal combustion engine in which the number of parts is reduced, assembly labor is reduced, and cost is reduced as compared with the conventional knocking detection device.
【０００７】[0007]
【課題を解決するための手段及び発明の効果】かかる目
的を達成するためになされた請求項１に記載の発明は、
外周に雄ネジ部が形成された本体部と、該雄ネジ部の切
り終わりよりも軸方向下方において前記本体部から外側
に張り出した鍔部とを有する支持部材と、前記本体部を
挿通するために挿通孔が形成され、前記鍔部の上に載置
される圧電材料からなる検出素子と、前記本体部を挿通
するために挿通孔が形成され、前記検出素子に所定の圧
力を加えるために前記検出素子に載置される錘と、前記
検出素子からの信号を外部に引き出すために、前記検出
素子と前記鍔部との間及び前記検出素子と前記錘との間
に配置された検出電極と、を備えた内燃機関用ノッキン
グ検出装置であって、前記錘の挿通孔には、前記雄ネジ
部に螺合する雌ねじ部が形成されていることを特徴とす
る。Means for Solving the Problems and Effects of the Invention The invention according to claim 1 made in order to achieve the above object,
A support member having a main body portion having a male screw portion formed on the outer periphery and a collar portion projecting outward from the main body portion axially below the end of cutting the male screw portion, and for inserting the main body portion An insertion hole is formed in the through hole, a detection element made of a piezoelectric material placed on the flange portion and an insertion hole for inserting the main body portion are formed, and a predetermined pressure is applied to the detection element. A weight mounted on the detection element, and a detection electrode arranged between the detection element and the collar portion and between the detection element and the weight in order to extract a signal from the detection element to the outside. And a female screw portion that is screwed to the male screw portion is formed in the insertion hole of the weight.
【０００８】このように本発明では、錘自体に雌ねじ部
が形成されているために錘単独で支持部材に固定するこ
とができる。また、この錘により所定の圧力をかけた状
態で検出素子や検出電極も固定することができる。その
ため、従来必要であったナットと座金が不要となる。As described above, in the present invention, since the internal thread portion is formed on the weight itself, the weight alone can be fixed to the supporting member. In addition, the detection element and the detection electrode can be fixed while a predetermined pressure is applied by the weight. Therefore, the nuts and washers that have been conventionally required are not required.
【０００９】したがって本発明によるノッキング検出装
置によれば、従来のそれに比べ部品点数を減らし、組立
の手間を軽減することができる。よって本発明によれ
ば、従来と同様の機能を有するノッキング検出装置を低
コストで製造し、安価に供給できる。Therefore, according to the knocking detection device of the present invention, it is possible to reduce the number of parts and the labor of assembling as compared with the conventional device. Therefore, according to the present invention, a knocking detection device having the same function as the conventional one can be manufactured at low cost and supplied at low cost.
【００１０】ここで、支持部材としては検出素子、検出
電極及び錘を支持できればよく、材質は特に問われない
が、導電性材料を用いる場合は、検出素子から得られる
検出電流が支持部材により短絡され正常な検出が行えな
くなる。したがって支持部材に導電性材料を使用する場
合は、請求項２に記載のように、検出電極の一方と支持
部材の鍔部の間、または検出電極の他方と錘の間の、少
なくとも一方に絶縁部材を配置するとよい。Here, the supporting member is not particularly limited as long as it can support the detecting element, the detecting electrode and the weight, and when the conductive material is used, the detecting current obtained from the detecting element is short-circuited by the supporting member. Therefore, normal detection cannot be performed. Therefore, when a conductive material is used for the support member, as described in claim 2, insulation is provided between at least one of the detection electrodes and the collar portion of the support member, or between the other of the detection electrodes and the weight. It is good to arrange members.
【００１１】つまりこのようにすれば、検出素子で発生
して外部に導出される電流の絶縁性が確保され、支持部
材に導電性材料を使用することが可能となる。導電性材
料として、例えば金属（鉄、アルミニウム等）を支持部
材に使用すれば、強度、耐熱性や耐久性が著しく増し
た、ノッキング検出装置が得られる。That is, in this way, the insulating property of the electric current generated in the detecting element and led to the outside is secured, and it becomes possible to use the conductive material for the supporting member. If, for example, a metal (iron, aluminum, etc.) is used as the conductive material for the support member, a knocking detection device having significantly increased strength, heat resistance and durability can be obtained.
【００１２】一方、請求項３に記載のように、支持部材
に絶縁性材料を使用する場合は、検出素子から得られる
検出電流が前記支持部材により短絡されることがないの
で絶縁部材を用いる必要がない。そのため、部品点数が
減り、組立も容易となる。また、前記支持部材にプラス
チック等の材質を使用することが可能となり、ノッキン
グセンサの軽量化及び、材質上製作が容易であるため形
状の自由度も向上する効果が得られる。On the other hand, when an insulating material is used for the support member as described in claim 3, it is necessary to use an insulating member because the detection current obtained from the detection element is not short-circuited by the support member. There is no. Therefore, the number of parts is reduced and the assembling becomes easy. In addition, since it is possible to use a material such as plastic for the supporting member, the knocking sensor can be made lighter and the material can be easily manufactured, so that the degree of freedom in shape can be improved.
【００１３】一方、錘の雌ネジ部と本体部の雄ネジ部が
完全に密着している場合、錘自身が前記本体部に完全に
固定されることとなり振動特性が悪化する場合がある。
そこで、請求項４に記載のように、前記錘において、挿
通孔の一方の開放端側が雌ネジ部よりも拡径させること
により、前記支持部材の本体部との間に隙間を形成する
とよい。このようにすれば、錘の固定箇所が挿通孔全体
でなくなり、部分的に錘自身の自由運動が容易となる。
この結果、加速運動による前記錘の前記検出素子に対し
ての加圧が増加するために、ノッキング検出装置として
の性能が向上する効果が得られる。On the other hand, when the female screw portion of the weight and the male screw portion of the main body are in complete contact, the weight itself is completely fixed to the main body, which may deteriorate the vibration characteristics.
Therefore, as described in claim 4, in the weight, a gap may be formed between the body and the main body of the support member by expanding one opening end side of the insertion hole more than the female screw portion. By doing so, the fixed portion of the weight is not the entire insertion hole, and the free movement of the weight itself is partially facilitated.
As a result, since the pressure applied to the detection element by the weight increases due to the acceleration motion, the effect of improving the performance of the knocking detection device can be obtained.
【００１４】[0014]
【発明の実施の形態】以下に、本発明の実施例を図面と
共に説明する。図１は、本発明が適用された実施例のノ
ッキング検出装置全体の外観図（ａ）と断面図（ｂ）で
ある。断面図（ｂ）においてノッキング検出装置は、金
属製の材質（例えばＳＷＣＨ３５Ｋ）からなり外周に雄
ネジ部が形成された本体部２０ａとその雄ネジ部の切り
終わりよりも軸方向下方にて外側に張り出した鍔部２０
ｂとを有し内燃機関に取り付け可能な支持部材２０と、
圧電材料からなる検出素子２１と、錘としての効果を発
揮する程度の比重を持った金属材料（例えばＳＧＤ３）
からなる錘２４と、導電性材料（例えば黄銅）からなる
検出電極２２と、フィルム状の絶縁性を有する合成樹脂
（例えばＰＥＴ）からなる絶縁部材２３と、外部に電気
信号を取り出す箇所となる電極端子２５と、合成樹脂
（例えば６６ナイロン）からなり全体を保護するための
カバー２６とを備えている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view (a) and a sectional view (b) of the entire knocking detection device of an embodiment to which the present invention is applied. In the cross-sectional view (b), the knocking detection device is made of a metallic material (for example, SWCH35K) and has a body portion 20a formed with a male screw portion on the outer periphery and an outer side axially below the end of cutting of the male screw portion. Overhanging collar part 20
a support member 20 having b and attachable to an internal combustion engine;
The detection element 21 made of a piezoelectric material and a metal material having a specific gravity enough to exert an effect as a weight (for example, SGD3)
24, a detection electrode 22 made of a conductive material (for example, brass), an insulating member 23 made of a film-like synthetic resin (for example, PET) having an insulating property, and an electrode for extracting an electric signal to the outside. The terminal 25 and a cover 26 made of synthetic resin (for example, 66 nylon) for protecting the whole are provided.
【００１５】この内、支持部材２０はノッキング検出装
置固定用挿通孔２７を備えている。また、検出素子２
１、錘２４、検出電極２２及び絶縁部材２３は、本体部
２０ａを挿通するための挿通孔を備えている。一方、図
２は錘２４を示し、（ａ）は平面図、（ｂ）は一部破断
側面図、（ｃ）は底面図である。図２に示すように、錘
２４は前記支持部材２０に取り付け用の挿通孔２４３を
有した円盤状の形状で、その軸方向上部の外周には固定
時に使用するたの六角ナット部２４２が形成され、挿通
孔２４３の内壁には支持部材２０に固定するための雌ネ
ジ部２４１が形成されている。本実施例では、挿通孔２
４３内にある雌ネジ部２４１は挿通孔２４３内の上部内
壁にのみあり、それ以外の部位の挿通孔の径は雌ネジ部
２４１の径に比較し大きくなっている。Of these, the support member 20 has an insertion hole 27 for fixing the knocking detection device. In addition, the detection element 2
1, the weight 24, the detection electrode 22, and the insulating member 23 have insertion holes for inserting the main body 20a. On the other hand, FIG. 2 shows the weight 24, (a) is a plan view, (b) is a partially cutaway side view, and (c) is a bottom view. As shown in FIG. 2, the weight 24 has a disk shape having an insertion hole 243 for attachment to the support member 20, and a hexagonal nut portion 242 used at the time of fixing is formed on the outer periphery of the axial upper portion thereof. A female screw portion 241 for fixing to the support member 20 is formed on the inner wall of the insertion hole 243. In this embodiment, the insertion hole 2
The female screw portion 241 in 43 is only on the upper inner wall of the insertion hole 243, and the diameter of the insertion hole in the other portions is larger than the diameter of the female screw portion 241.
【００１６】次にノッキング検出装置２を組み立てる手
順の一例について図１（ｂ）を用いて説明する。
（１）まず、支持部材２０の上に検出素子２１及び錘２
４を載置する。この時、検出素子２１の上下に検出電極
２２を挟み、支持部材２０と検出素子２１の間及び、錘
２４と検出素子２１の間には絶縁部材２３を挟む。Next, an example of a procedure for assembling the knocking detection device 2 will be described with reference to FIG. (1) First, the detection element 21 and the weight 2 are provided on the support member 20.
Place 4. At this time, the detection electrodes 22 are sandwiched above and below the detection element 21, and the insulating member 23 is sandwiched between the support member 20 and the detection element 21 and between the weight 24 and the detection element 21.
【００１７】（２）次に錘の雌ネジ部２４１を支持部材
２０の雄ネジ部２０ｃに螺合し、更に六角ナット部２４
２利用して錘２４を支持部材２０に締め付ける。尚、こ
の時の締め付けトルクは、検出素子２２に所定の圧力が
かかるように締め付ける。なぜならば、検出素子２２の
実体である圧電素子が、所定の圧力下にて望む結果が得
られる性質を有するからである。(2) Next, the female screw portion 241 of the weight is screwed into the male screw portion 20c of the support member 20, and the hexagonal nut portion 24 is further attached.
2 The weight 24 is tightened to the support member 20 by utilizing 2. The tightening torque at this time is such that a predetermined pressure is applied to the detection element 22. This is because the piezoelectric element, which is the substance of the detection element 22, has the property of obtaining a desired result under a predetermined pressure.
【００１８】（３）そして最後に、電極端子２５及び、
カバー２６を取り付ける。以上のような手順によりノッ
キング検出装置２を組み立てることができる。一方、本
ノッキング検出装置の内燃機関への取り付けは、ノッキ
ング検出装置固定用挿通孔２７を使用して内燃機関のシ
リンダヘッド等に固定することにより行う。内燃機関よ
り支持棒が突出している場合は、その支持棒にノッキン
グ検出装置固定用挿通孔２７を差し、上部よりナット等
で固定する。また、内燃機関にボルト用の雌ネジがある
場合は、ボルトをノッキング検出装置固定用挿通孔２７
の上部より挿通させ締め付けることにより固定する。電
極端子２５については、本装置より発生する検出電圧を
処理するための装置に接続する。(3) And finally, the electrode terminal 25 and
Attach the cover 26. The knocking detection device 2 can be assembled by the above procedure. On the other hand, the knocking detection device is attached to the internal combustion engine by fixing it to the cylinder head or the like of the internal combustion engine using the knocking detection device fixing insertion hole 27. When the support rod is projected from the internal combustion engine, the knocking detection device fixing insertion hole 27 is inserted into the support rod and fixed from above with a nut or the like. When the internal combustion engine has a female screw for a bolt, the bolt is inserted into the knocking detection device fixing insertion hole 27.
Insert it from above and tighten it to fix. The electrode terminal 25 is connected to a device for processing a detection voltage generated by this device.
【００１９】このように、内燃機関にノッキング検出装
置を取り付け、内燃機関からノッキング検出装置２に振
動が伝わると、錘２４によって加重のかかった検出素子
２１に、振動に対応した検出電圧が発生する。その検出
電圧は検出電極２２及び電極端子２５を通って、外部の
検出電圧を処理するための装置に出力され、この装置で
ノッキングの判定が行われる。As described above, when the knocking detection device is attached to the internal combustion engine and the vibration is transmitted from the internal combustion engine to the knocking detection device 2, a detection voltage corresponding to the vibration is generated in the detection element 21 weighted by the weight 24. . The detected voltage passes through the detection electrode 22 and the electrode terminal 25 and is output to an external device for processing the detected voltage, and this device determines knocking.
【００２０】以上説明したように、本実施例では錘２４
自体に雌ネジ部２４１が形成されているので、従来装置
のようにナットや座金を用いることなく、検出素子２１
に対して所定の加重をかけた状態で支持部材２０に固定
できる。このため本実施例によるノッキング検出装置に
よれば、従来のそれに比べ部品点数を減らし、組立の手
間を軽減することができる。よって本実施例によれば、
従来と同様の機能を有するノッキング検出装置を低コス
トで製造し、安価に供給できる。As described above, the weight 24 is used in this embodiment.
Since the female screw portion 241 is formed on itself, the detecting element 21 can be used without using a nut or a washer unlike the conventional device.
Can be fixed to the support member 20 in a state in which a predetermined weight is applied. Therefore, according to the knocking detection device of this embodiment, it is possible to reduce the number of parts and the labor of assembly as compared with the conventional one. Therefore, according to this embodiment,
It is possible to manufacture the knocking detection device having the same function as the conventional one at low cost and to supply it at low cost.
【００２１】また、本実施例では、支持部材２０に金属
を用いているため、強度、耐熱性や耐久性に優れたノッ
キング検出装置となっている。また、本実施例では、挿
通孔２４３内にある雌ネジ部２４１は挿通孔２４３内の
上部にのみあり、それ以外の部位の挿通孔２４３の径は
雌ネジ部２４１の径に比較し大きくなっている。そのた
め挿通孔全体によって錘２４は、支持部材２０に固定さ
れていないため、部分的に錘２４自身の自由運動が容易
となる。したがって、内燃機関からノッキング検出装置
に振動が伝わると、錘２４が容易に加速運動をし、その
加速度運動に応じた検出電圧が得られ、結果的にノッキ
ング検出装置としての性能が向上する効果が得られる。Further, in this embodiment, since the supporting member 20 is made of metal, the knocking detecting device is excellent in strength, heat resistance and durability. Further, in this embodiment, the female screw portion 241 in the insertion hole 243 is only present in the upper portion of the insertion hole 243, and the diameter of the insertion hole 243 in other portions is larger than the diameter of the female screw portion 241. ing. Therefore, since the weight 24 is not fixed to the support member 20 by the entire insertion hole, the free movement of the weight 24 itself is partially facilitated. Therefore, when vibration is transmitted from the internal combustion engine to the knocking detection device, the weight 24 easily accelerates and a detection voltage corresponding to the acceleration motion is obtained, and as a result, the performance as the knocking detection device is improved. can get.
【００２２】以上、本発明の実施例について説明した
が、本発明は上記実施例に限定されるものではなく、種
々の態様を採ることができる。例えば、上記実施例は支
持部材２０に導電性材料を使用しているが絶縁性材料を
使用することも可能である。支持部材２０に絶縁性材料
を使用すれば、検出素子２２で発生する検出電流が支持
部材２０によって短絡されることがなくなり、絶縁部材
２３は不要となる。したがって、ノッキング検出装置の
組立がより容易になるととともに、前記支持部材にプラ
スチック等の材質を使用することが可能となり、前記支
持部材の軽量化及び、材質上製作が容易であるため形状
の自由度も向上する効果が生まれる。Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modes can be adopted. For example, in the above embodiment, the support member 20 is made of a conductive material, but an insulating material can also be used. If an insulating material is used for the supporting member 20, the detection current generated in the detecting element 22 will not be short-circuited by the supporting member 20, and the insulating member 23 will be unnecessary. Therefore, the knocking detection device can be more easily assembled, and the support member can be made of a material such as plastic. The support member can be made lighter and the material can be easily manufactured. The effect is also improved.
【００２３】また、図２の挿通孔２４３において、本実
施例では雌ネジ部２４１がない部分の径は一定である
が、この径を軸方向に対して漸次的に増加及び減少させ
ることも考えられる。また挿通孔２４３内を全て雌ネジ
部で構成することも考えられる。これらのことにより振
動特性が変化し、加速運動による検出素子２１に対して
の加圧の状態も変化するため、種々の特性を持ったノッ
キング検出装置が得られる。In the insertion hole 243 of FIG. 2, the diameter of the portion without the female screw portion 241 is constant in this embodiment, but it is also possible to gradually increase or decrease this diameter in the axial direction. To be It is also conceivable that the inside of the insertion hole 243 is entirely formed with a female screw portion. As a result, the vibration characteristics change, and the state of pressurization of the detection element 21 due to the acceleration movement also changes, so that a knocking detection device having various characteristics can be obtained.
【００２４】また、図３（ａ）及び（ｂ）は、図１にお
ける錘２４の別の形状である。図３（ａ）（ｂ）に示す
各錘は共に雌ネジ部２４１、締め付け時に使用するため
の六角ナット部２４２を備えている。図３（ａ）に示す
錘２４は全体が六角ナットの形状を有している。このよ
うな形状を採れば、図１に示した錘２４と同様の効果を
有した上で、錘の締め付け時の作業性が向上する効果が
得られる。3 (a) and 3 (b) show another shape of the weight 24 in FIG. Each of the weights shown in FIGS. 3A and 3B is provided with a female screw portion 241 and a hexagonal nut portion 242 for use during tightening. The weight 24 shown in FIG. 3A has a hexagonal nut shape as a whole. By adopting such a shape, in addition to having the same effect as the weight 24 shown in FIG. 1, the workability at the time of tightening the weight can be improved.
【００２５】また、図３（ｂ）に示す錘２４は、雌ネジ
部２４１が軸方向下方にあり、図１に示した錘２４とは
雌ネジ部２４１の位置が異なる。このような形状をして
いても、支持部材２０に固定することができ、検出素子
２１に加重をかけるという錘本来の役割も果たすことが
可能である。そして、図３（ｂ）に示す錘２４の自由運
動の特性が、図１に示した錘２４とは異なるので、ノッ
キング検出装置の検出特性も異なる特性が得られる。Further, the weight 24 shown in FIG. 3B has the female screw portion 241 axially downward, and the position of the female screw portion 241 is different from that of the weight 24 shown in FIG. Even if it has such a shape, it can be fixed to the support member 20 and can also play the original role of the weight, which applies a weight to the detection element 21. Since the characteristic of the free movement of the weight 24 shown in FIG. 3B is different from that of the weight 24 shown in FIG. 1, the detection characteristic of the knocking detection device is also different.
【００２６】また、検出素子の圧電材料としては、チタ
ン酸鉛や、チタン酸バリウム等の通常の圧電材料を用い
ることが出来る。また、環境負荷軽減のための鉛フリー
材料としては、ＢＮＴ、ＢＴ、ＢＫＴの様な３種の酸化
物からなるペロブスカイト型の結晶構造を含む圧電材料
セラミックスを用いることも出来る。ここで、ＢＮＴは
（Ｂｉ0.5Ｎａ0.5）ＴｉＯ3を、ＢＴはＢａＴｉＯ3を、
ＢＫＴは（Ｂｉ0.5Ｋ0 .5）ＴｉＯ3を、それぞれ示す。
この鉛フリー材料は１５０℃という高温下で長時間使用
しても熱劣化が少ないというノッキングセンサに利用し
た場合に有利な効果を有している。Further, as the piezoelectric material of the detection element, a usual piezoelectric material such as lead titanate or barium titanate can be used. Further, as the lead-free material for reducing the environmental load, it is possible to use piezoelectric material ceramics including a perovskite type crystal structure composed of three kinds of oxides such as BNT, BT and BKT. Here, BNT is (Bi 0.5 Na 0.5 ) TiO 3 and BT is BaTiO 3 .
BKT is a (Bi 0.5 K 0 .5) TiO 3, respectively.
This lead-free material has an advantageous effect when it is used for a knocking sensor, in which thermal deterioration is small even if it is used at a high temperature of 150 ° C. for a long time.
【図１】 実施例のノッキング検出装置の概略構成を示
す説明図である。FIG. 1 is an explanatory diagram showing a schematic configuration of a knocking detection device according to an embodiment.
【図２】 錘２４の概略構成を示す説明図である。FIG. 2 is an explanatory diagram showing a schematic configuration of a weight 24.
【図３】 錘２４の別形状の概略構成を示す説明図であ
る。FIG. 3 is an explanatory diagram showing a schematic configuration of another shape of the weight 24.
２…ノッキング検出装置、２０…支持部材、２１…検出
素子、２２…検出電極、２３…絶縁部材、２４…錘、２
５…電極端子、２６…カバー、２７…ノッキング検出装
置固定用挿通孔、２４１…雌ネジ部、２４２…六角ナッ
ト部、２４３…挿通孔。2 ... Knocking detection device, 20 ... Support member, 21 ... Detection element, 22 ... Detection electrode, 23 ... Insulation member, 24 ... Weight, 2
5 ... Electrode terminal, 26 ... Cover, 27 ... Insertion hole for fixing knocking detection device, 241 ... Female screw part, 242 ... Hexagon nut part, 243 ... Insertion hole.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2F055 AA23 BB12 CC11 DD09 EE23 FF43 GG11 2G087 AA13 BB12 3G019 GA14 KA28 KD17 ─────────────────────────────────────────────────── ─── Continued front page F term (reference) 2F055 AA23 BB12 CC11 DD09 EE23 FF43 GG11 2G087 AA13 BB12 3G019 GA14 KA28 KD17
Claims (4)
該雄ネジ部の切り終わりよりも軸方向下方において前記
本体部から外側に張り出した鍔部とを有する支持部材
と、 前記本体部を挿通するために挿通孔が形成され、前記鍔
部の上に載置される圧電材料からなる検出素子と、 前記本体部を挿通するために挿通孔が形成され、前記検
出素子に所定の圧力を加えるために前記検出素子に載置
される錘と、 前記検出素子からの信号を外部に引き出すために、前記
検出素子と前記鍔部との間及び前記検出素子と前記錘と
の間に配置された検出電極と、 を備えた内燃機関用ノッキング検出装置であって、 前記錘の挿通孔には、前記雄ネジ部に螺合する雌ねじ部
が形成されていることを特徴とする内燃機関用ノッキン
グ検出装置。1. A body portion having a male screw portion formed on the outer periphery,
A support member having a collar portion that projects outward from the body portion axially below the end of cutting the male screw portion, and an insertion hole for inserting the body portion is formed on the collar portion. A detection element made of a piezoelectric material to be placed; an insertion hole for inserting the main body portion; a weight placed on the detection element to apply a predetermined pressure to the detection element; A knocking detection device for an internal combustion engine, comprising: a detection electrode disposed between the detection element and the collar portion and between the detection element and the weight in order to extract a signal from the element to the outside. A female screw portion that is screwed into the male screw portion is formed in the insertion hole of the weight.
記検出電極の一方と前記鍔部の間、または前記検出電極
の他方と前記錘の間の、少なくとも一方に絶縁部材を配
置したことを特徴とする請求項１記載の内燃期間用ノッ
キング検出装置。2. The supporting member is made of a conductive material, and an insulating member is disposed between at least one of the detection electrodes and the collar portion or between the other of the detection electrodes and the weight. The knocking detection device for an internal combustion period according to claim 1.
を特徴とする請求項１記載の内燃機関用ノッキング検出
装置。3. The knocking detection device for an internal combustion engine according to claim 1, wherein the support member is made of an insulating material.
放端側が雌ネジ部よりも拡径しており、前記支持部材の
本体部との間に隙間が形成されていることを特徴とする
請求項１乃至３記載の内燃機関用ノッキング検出装置。4. The weight is such that the axially one open end side of the insertion hole is wider than the female screw portion, and a gap is formed between the weight and the main body portion of the support member. The knocking detection device for an internal combustion engine according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001284976A JP3910030B2 (en) | 2001-09-19 | 2001-09-19 | Internal combustion engine knock detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001284976A JP3910030B2 (en) | 2001-09-19 | 2001-09-19 | Internal combustion engine knock detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003090242A true JP2003090242A (en) | 2003-03-28 |
| JP3910030B2 JP3910030B2 (en) | 2007-04-25 |
Family
ID=19108205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001284976A Expired - Fee Related JP3910030B2 (en) | 2001-09-19 | 2001-09-19 | Internal combustion engine knock detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3910030B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003517597A (en) * | 1999-12-15 | 2003-05-27 | 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 | Vibration pickup with pressure sleeve |
| JP2003517596A (en) * | 1999-12-15 | 2003-05-27 | 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 | Vibration detector with pressure sleeve |
| JP2010071755A (en) * | 2008-09-17 | 2010-04-02 | Ngk Spark Plug Co Ltd | Knocking sensor |
| JP2013007612A (en) * | 2011-06-23 | 2013-01-10 | Ngk Spark Plug Co Ltd | Non-resonance type knocking sensor |
-
2001
- 2001-09-19 JP JP2001284976A patent/JP3910030B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003517597A (en) * | 1999-12-15 | 2003-05-27 | 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 | Vibration pickup with pressure sleeve |
| JP2003517596A (en) * | 1999-12-15 | 2003-05-27 | 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 | Vibration detector with pressure sleeve |
| JP4664560B2 (en) * | 1999-12-15 | 2011-04-06 | 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 | Vibration pickup with pressure sleeve |
| JP4800539B2 (en) * | 1999-12-15 | 2011-10-26 | 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 | Vibration detector with pressure sleeve |
| JP2010071755A (en) * | 2008-09-17 | 2010-04-02 | Ngk Spark Plug Co Ltd | Knocking sensor |
| JP2013007612A (en) * | 2011-06-23 | 2013-01-10 | Ngk Spark Plug Co Ltd | Non-resonance type knocking sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3910030B2 (en) | 2007-04-25 |
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