JPH0543390Y2 - - Google Patents
Info
- Publication number
- JPH0543390Y2 JPH0543390Y2 JP1987150587U JP15058787U JPH0543390Y2 JP H0543390 Y2 JPH0543390 Y2 JP H0543390Y2 JP 1987150587 U JP1987150587 U JP 1987150587U JP 15058787 U JP15058787 U JP 15058787U JP H0543390 Y2 JPH0543390 Y2 JP H0543390Y2
- Authority
- JP
- Japan
- Prior art keywords
- bush
- filler
- end surface
- case
- piezoelectric element
- 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 - Lifetime
Links
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 2
- 239000000945 filler Substances 0.000 description 26
- 238000001514 detection method Methods 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、内燃機関の振動を検出してノツキ
ングを検知するための振動検出器に関するもので
ある。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a vibration detector for detecting knocking by detecting vibrations of an internal combustion engine.
第２図ａ，ｂは従来のこの種振動検出器の平面
図とａ図の−線における断面図を示すもの
で、図において、１は中心内面にボルト挿通孔１
３を有する鉄系の金属材からなるブツシユで、こ
のブツシユ１は検出器が内燃機関に接する座面１
ａと、構成部品を組付けるための台面１ｂおよび
構成部品を組付ける軸となる円筒部１ｃを有す
る。２はブツシユ１の外周部と接着などで結合さ
れ、ブツシユ１と共に構成部品の収納部を構成す
るケース、３はケース２と一体に設けられたコネ
クタで、検出信号を導出する出力端子１１を有す
る。４はブツシユ１の台面１ｂ上に配されたプレ
ート、５は振動を電気信号に変換する圧電素子
で、この圧電素子５の基準電極がプレート４と接
続してある。６は圧電素子５の出力電極に接し、
検出信号を出力するターミナル、７はターミナル
６の圧電素子５と接しない側に接して配設された
PET（ポリエチレンテレフタレート）またはPPS
（ポリフエニレンサルフアイト）等のフイルムか
らなる絶縁シート、８は圧電素子５に振動応力を
印加するウエイト、９はブツシユ１の円筒部１ｃ
にプレート４、圧電素子５、ターミナル６、絶縁
シート７、ウエイト８を組付けるために円筒部１
ｃのねじ部１ｅにねじ止めされたナツト、１０は
ブツシユ１とケース２との収納部を密封するエポ
キシ系の充填剤、１２はブツシユ１と圧電素子
５、ターミナル６、絶縁シート７との間に設けら
れた粘着テープまたは熱収縮性チユーブからなる
絶縁チユーブである。ここで、圧電素子５から得
られた検出信号はターミナル６によつて導出され
る。また、ターミナル６と出力端子１１とが接続
されているので検出信号はコネクタ３を介して検
出器外へ出力される。
Figures 2a and 2b show a plan view of a conventional vibration detector of this type and a sectional view taken along the - line in figure a.
3, this bushing 1 is a bushing made of iron-based metal material having a
a, a base surface 1b for assembling the components, and a cylindrical portion 1c serving as an axis for assembling the components. A case 2 is connected to the outer circumference of the bush 1 by adhesive or the like and constitutes a component storage area together with the bush 1, and a connector 3 is provided integrally with the case 2, and has an output terminal 11 from which a detection signal is derived. . 4 is a plate arranged on the base surface 1b of the bush 1; 5 is a piezoelectric element that converts vibration into an electric signal; a reference electrode of this piezoelectric element 5 is connected to the plate 4; 6 is in contact with the output electrode of the piezoelectric element 5,
The terminal 7 that outputs the detection signal is placed in contact with the side of the terminal 6 that is not in contact with the piezoelectric element 5.
PET (polyethylene terephthalate) or PPS
(polyphenylene sulfite) or the like; 8 is a weight that applies vibrational stress to the piezoelectric element 5; 9 is a cylindrical portion 1c of the bush 1;
The cylindrical part 1 is used to assemble the plate 4, piezoelectric element 5, terminal 6, insulating sheet 7, and weight 8 to the cylindrical part 1.
A nut screwed to the threaded portion 1e of c; 10 an epoxy filler for sealing the storage area between the bush 1 and the case 2; 12 a seal between the bush 1 and the piezoelectric element 5, the terminal 6, and the insulating sheet 7; An insulating tube made of adhesive tape or heat-shrinkable tube attached to the tube. Here, the detection signal obtained from the piezoelectric element 5 is derived through the terminal 6. Furthermore, since the terminal 6 and the output terminal 11 are connected, the detection signal is outputted to the outside of the detector via the connector 3.
次に振動の検出原理について説明する。ブツシ
ユ１のボルト挿通孔１３から挿入したボルト（図
示せず）によつて内燃機関に振動検出器の座面１
ａが接して固定される。内燃機関の運転状態に応
じて生じる振動は座面１ａから検出器に伝わる。
圧電素子５とウエイト８は積み重ねられて組付け
られているので、振動に応じてウエイト８の慣性
応力が圧電素子５に伝わる。圧電素子５はこの慣
性応力を受けると、これに比例した検出信号を発
生し、プレート４側の電極を基準にターミナル６
側の電極に検出信号を出力する。プレート４は金
属剤であるので圧電素子５の基準電極はブツシユ
１と同電位である。一方、ナツト９、ウエイト８
は金属剤であるので、ウエイト８は圧電素子５の
基準電極と同電位である。このため、絶縁シート
７を設けてターミナル６とウエイト８とを絶縁し
ている。これにより、圧電素子５で得た検出信号
はターミナル６で導出され、出力端子１１を介し
て出力される。ここで、ブツシユ１の円筒部１ｃ
に絶縁チユーブ１２を挿着しているので、ターミ
ナル６の組付けに偏心があつても、ターミナル６
はブツシユ１の円筒部１ｃと短絡することがな
い。このため、絶縁チユーブ１２は検出信号を確
実に導出するために重要である。なお、絶縁チユ
ーブ１２が設けられている円筒部１ｃの外周にあ
つて、台面１ｂ、プレート４、圧電素子５、ター
ミナル６、絶縁シート７、ウエイト８、ナツト９
で囲まれた内側には充填剤１０は充填しない。 Next, the vibration detection principle will be explained. The seat surface 1 of the vibration detector is connected to the internal combustion engine by a bolt (not shown) inserted through the bolt insertion hole 13 of the bush 1.
a are in contact and fixed. Vibrations generated depending on the operating state of the internal combustion engine are transmitted from the seat surface 1a to the detector.
Since the piezoelectric element 5 and the weight 8 are stacked and assembled, the inertial stress of the weight 8 is transmitted to the piezoelectric element 5 in response to vibration. When the piezoelectric element 5 receives this inertial stress, it generates a detection signal proportional to this inertial stress, and connects the terminal 6 with the electrode on the plate 4 side as a reference.
A detection signal is output to the side electrode. Since the plate 4 is made of a metal material, the reference electrode of the piezoelectric element 5 has the same potential as the bush 1. On the other hand, Natsuto 9, Weight 8
Since is a metal agent, the weight 8 has the same potential as the reference electrode of the piezoelectric element 5. For this reason, an insulating sheet 7 is provided to insulate the terminal 6 and the weight 8. Thereby, the detection signal obtained by the piezoelectric element 5 is derived at the terminal 6 and outputted via the output terminal 11. Here, the cylindrical part 1c of the bush 1
Since the insulating tube 12 is inserted into the terminal 6, even if the terminal 6 is installed eccentrically, the terminal 6
There will be no short circuit with the cylindrical portion 1c of the bush 1. Therefore, the insulating tube 12 is important for reliably deriving the detection signal. In addition, on the outer periphery of the cylindrical portion 1c where the insulating tube 12 is provided, there are a base 1b, a plate 4, a piezoelectric element 5, a terminal 6, an insulating sheet 7, a weight 8, and a nut 9.
The filler 10 is not filled inside the area surrounded by.
従来の振動検出器は以上のように構成されてお
り、ブツシユ１とケース２とからなる収納部に充
分する充填剤１０はブツシユ１の上端面１ｄに付
着しないようにする必要がある。この理由を第３
図について説明する。この図は第２図に示したブ
ツシユ１のボルト挿通孔１３にボルト１４を通し
て振動検出器を図示しない内燃機関に固定してい
る状態を示し、この際、充填剤１０の充填量が多
くブツシユ１の上端面１ｄおよびケース２の上端
面２ａにまで付着している状態である。このよう
に充填剤１０が過度に充填されると、ボルト１４
はブツシユ１の上端面１ｄの充填剤１０に食い込
んで締付けられ、ボルト１４と上端面１ｄ間に充
填剤１０がかみ込んだ状態となる。この結果、ボ
ルト１４の締付けが不充分で検出器と内燃機関と
の密着性が低下するという問題がある。したがつ
て、充填剤１０の充填量はブツシユ１の上端面１
ｄに達しないように厳しい管理が必要となる。
The conventional vibration detector is constructed as described above, and it is necessary to prevent the filler 10 sufficient for the housing section consisting of the bush 1 and the case 2 from adhering to the upper end surface 1d of the bush 1. This reason is the third reason.
The diagram will be explained. This figure shows a state in which the vibration detector is fixed to an internal combustion engine (not shown) by passing a bolt 14 through the bolt insertion hole 13 of the bush 1 shown in FIG. It is in a state that it is attached to the upper end surface 1d and the upper end surface 2a of the case 2. If the filler 10 is filled excessively in this way, the bolt 14
is bitten into the filler 10 on the upper end surface 1d of the bush 1 and tightened, and the filler 10 is caught between the bolt 14 and the upper end surface 1d. As a result, there is a problem in that the bolts 14 are not tightened enough and the close contact between the detector and the internal combustion engine is reduced. Therefore, the filling amount of the filler 10 is
Strict management is required to avoid reaching d.
この考案は上記のような問題点を解消するため
になされたもので、充填剤のブツシユ上端面への
付着を防止できるようにした振動検出器を得るこ
とを目的とする。 This invention was made to solve the above-mentioned problems, and the object is to obtain a vibration detector that can prevent the filler from adhering to the upper end surface of the bush.
この考案に係る振動検出器は、ブツシユの上端
面をケースの上端面より高くして外方へ突出する
ようにしたものである。
In the vibration detector according to this invention, the upper end surface of the bushing is made higher than the upper end surface of the case so as to protrude outward.
この考案においては、ブツシユとケースとの間
の収納部に過度の充填剤を充填した際であつて
も、ブツシユの上端面がその外周側のケースの上
端面より高く突出しているので、ブツシユの上端
面への充填剤の付着は生じない。
In this device, even when the storage area between the bush and the case is filled with an excessive amount of filler, the top end of the bush protrudes higher than the top of the case on the outer periphery. No filler adheres to the upper end surface.
以下、この考案の一実施例を図について説明す
る。第１図はこの考案による振動検出器の断面図
を示すもので、図中、各符号は第２図に示した従
来例の振動検出器と全て同一である。この考案は
従来例と異なる点は、ブツシユ１の円筒部１ｃの
上端面１ｄを該円筒部１ｃの外周側のケース２の
上端面２ａより高く外方へ突出したものである。
An embodiment of this invention will be described below with reference to the drawings. FIG. 1 shows a sectional view of a vibration detector according to this invention, and in the figure, each reference numeral is the same as that of the conventional vibration detector shown in FIG. This invention differs from the conventional example in that the upper end surface 1d of the cylindrical portion 1c of the bush 1 projects outward higher than the upper end surface 2a of the case 2 on the outer peripheral side of the cylindrical portion 1c.
上記のように構成したことにより、ブツシユ１
とケース２との間の収納部に充填剤１０を充填し
た際に、充填剤１０はブツシユ１の円筒部１ｃか
らケース２の周縁部に亘つて裾野形状に形成さ
れ、たとえ過度の量の充填剤１０を充填したとし
ても余分な充填剤がケース２の周縁部に溢れるよ
うな形状に盛り上がり、円筒部１ｃの上端面１ｄ
への充填剤１０の付着が防止できる。これによつ
て、ブツシユ１のボルト挿通孔１３へのボルトの
締付の際、ボルトの充填剤への食い込みやかみ込
みもなく振動検出器の内燃機関への締付力を高め
ることができる。なお、ブツシユ１の円筒部１ｃ
の上端面１ｄに付着するほどの多量の充填剤１０
を充填した場合、充填剤はケース２の周縁部から
溢れ出てしまう。特に充填剤が加熱硬化の場合、
硬化過程で粘性が一旦低下し、流れ出しやすくな
るので、ブツシユ１の上端面１ｄへの充填剤の付
着は勿論生じない。 By configuring as above, the button 1
When filling the storage area between the case 2 and the case 2 with the filler 10, the filler 10 is formed into a skirt shape from the cylindrical part 1c of the bush 1 to the peripheral edge of the case 2, and even if an excessive amount of filling Even if the agent 10 is filled, the excess filler swells up in a shape that overflows the periphery of the case 2, and the upper end surface 1d of the cylindrical portion 1c.
It is possible to prevent the filler 10 from adhering to the surface. As a result, when tightening the bolt into the bolt insertion hole 13 of the bush 1, the bolt does not bite into the filler or bite, and the tightening force of the vibration detector to the internal combustion engine can be increased. In addition, the cylindrical portion 1c of the bush 1
A large amount of filler 10 is attached to the upper end surface 1d of
When filled, the filler overflows from the periphery of the case 2. Especially when the filler is heat-cured,
During the curing process, the viscosity temporarily decreases and the filler easily flows out, so of course the filler does not adhere to the upper end surface 1d of the bushing 1.
以上のようにこの考案によれば、ブツシユの円
筒部上端面を外周側のケース上端面より高く突出
するようにしたので、ブツシユとケースとの間の
構成部品の収納部への充填剤がブツシユ上端面に
付着することがなく、これにより、ブツシユに挿
通したボルトの充填剤への食い込みやかみ込みも
なく振動検出器の内燃機関への結合が確実に行な
える。また、例え、過度の量の充填剤を収容部へ
充填したとしても、余分な充填剤を、ケースの上
端面に沿つて外方へ確実に流出させることができ
るので、作業効率を極めて向上させることができ
ると共に、充填剤の充填量の管理が極めて容易に
なるといつた優れた効果を有する。
As described above, according to this invention, the upper end surface of the cylindrical part of the bushing is made to protrude higher than the upper end surface of the case on the outer circumferential side, so that the filler in the housing part of the component parts between the bushing and the case is prevented from flowing into the bushing. There is no adhesion to the upper end surface, and as a result, the vibration detector can be reliably connected to the internal combustion engine without biting or jamming of the bolt inserted into the bushing into the filler. In addition, even if an excessive amount of filler is filled into the storage part, the excess filler can be reliably flowed out along the top surface of the case, greatly improving work efficiency. In addition, it has an excellent effect in that the amount of filler to be filled can be extremely easily controlled.
第１図はこの考案による振動検出器の断面図、
第２図ａ，ｂは従来の振動検出器の平面図とａ図
における−線断面図、第３図は従来例の欠点
を説明するための振動検出器の断面図である。
１……ブツシユ、１ｃ……円筒部、１ｄ……上
端面、２……ケース、２ａ……上端面、１０……
充填剤、１３……ボルト挿通孔。なお、図中同一
符号は同一又は相当部分を示す。
Figure 1 is a cross-sectional view of the vibration detector according to this invention.
FIGS. 2a and 2b are a plan view of a conventional vibration detector and a sectional view taken along the line -2 in FIG. 1...Button, 1c...Cylindrical portion, 1d...Top end surface, 2...Case, 2a...Top end surface, 10...
Filler, 13...Bolt insertion hole. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
ツシユと、このブツシユの円筒部の外周側に収容
部を形成するように該ブツシユと結合したケース
と、上記収容部内に圧電素子等の構成部品を収容
し、これらを密封するための充填材とからなる振
動検出器において、上記ブツシユの円筒部の上端
面を、ケースの上端面より高く外方へ突出させた
ことを特徴とする振動検出器。 A bush having a cylindrical part with a bolt insertion hole in the center, a case coupled to the bush so as to form a accommodating part on the outer periphery of the cylindrical part of the bush, and a component such as a piezoelectric element in the accommodating part. A vibration detector comprising a filling material for accommodating and sealing the cylindrical portion of the bush, characterized in that the upper end surface of the cylindrical portion of the bush is made to protrude outward higher than the upper end surface of the case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987150587U JPH0543390Y2 (en) | 1987-10-01 | 1987-10-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987150587U JPH0543390Y2 (en) | 1987-10-01 | 1987-10-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6455427U JPS6455427U (en) | 1989-04-05 |
| JPH0543390Y2 true JPH0543390Y2 (en) | 1993-11-01 |
Family
ID=31423866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987150587U Expired - Lifetime JPH0543390Y2 (en) | 1987-10-01 | 1987-10-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0543390Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61153530A (en) * | 1984-12-13 | 1986-07-12 | ロ−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 | Knock sensor |
-
1987
- 1987-10-01 JP JP1987150587U patent/JPH0543390Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61153530A (en) * | 1984-12-13 | 1986-07-12 | ロ−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 | Knock sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6455427U (en) | 1989-04-05 |
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