JPH0421823B2 - - Google Patents
Info
- Publication number
- JPH0421823B2 JPH0421823B2 JP57006933A JP693382A JPH0421823B2 JP H0421823 B2 JPH0421823 B2 JP H0421823B2 JP 57006933 A JP57006933 A JP 57006933A JP 693382 A JP693382 A JP 693382A JP H0421823 B2 JPH0421823 B2 JP H0421823B2
- Authority
- JP
- Japan
- Prior art keywords
- storage member
- piezoelectric element
- electrode terminal
- storage
- housing member
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/09—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up
- G01P15/0907—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up of the compression mode type
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
この発明は、圧電素子を利用した加速度検出器
の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an acceleration detector using a piezoelectric element.
まず、この発明による加速度検出器の製造方法
を図に基づいて説明する。図において、１は例え
ば内燃機関等に取り付けるためのネジ部１ａを有
するハウジング部材、２は加速度を応力に変換す
るウエイト、３は応力を電気変換するチタン酸ジ
ルコン酸素鉛等で作られる圧電素子、４は電気変
換された検出出力を取り出すための電極端子、５
は上記ウエイト２、圧電素子３をハウジング部材
１に取り付けるためのネジ、６はネジ５を絶縁す
るためのチユーブ、７は電極端子４を絶縁するた
めのチユーブ、８は上記ハウジング部材１に嵌合
し、検出出力をこの加速検出器外部に伝えるため
の出力端子１１を保持し上記ハウジング部材１に
取りつけられたウエイト２、圧電素子３、電極端
子４を収納する収納部材で、この収納部材８はハ
ウジング部材１のカシメ部１ｂによつて気密状態
に取付けられている。また、収納部材８には電極
端子４と出力端子１１とを接続するための開口部
８ａが形成されている。９はハウジング部材１と
収納部材８とで構成される収納部内、１０はハウ
ジング部材１と収納部材８の接合部を防水するた
めの０リング、１１は前述の出力端子、１２は電
極端子４と出力端子１１の接続部分である開口部
８ａに充填され、この開口部８ａを防水するため
のシール材、１３は本発明に係る収納部材８に設
けられた空気孔である。 First, a method for manufacturing an acceleration detector according to the present invention will be explained based on the drawings. In the figure, 1 is a housing member having a threaded portion 1a for attachment to, for example, an internal combustion engine, 2 is a weight that converts acceleration into stress, and 3 is a piezoelectric element made of zircon titanate oxygen lead that converts stress into electricity. 4 is an electrode terminal for taking out the electrically converted detection output; 5
is a screw for attaching the weight 2 and the piezoelectric element 3 to the housing member 1; 6 is a tube for insulating the screw 5; 7 is a tube for insulating the electrode terminal 4; 8 is fitted to the housing member 1. This storage member 8 is a storage member that holds an output terminal 11 for transmitting a detection output to the outside of this acceleration detector and stores a weight 2, a piezoelectric element 3, and an electrode terminal 4 attached to the housing member 1. The housing member 1 is attached in an airtight manner by the caulking portion 1b. Moreover, an opening 8a for connecting the electrode terminal 4 and the output terminal 11 is formed in the storage member 8. Reference numeral 9 denotes the interior of the storage section composed of the housing member 1 and the storage member 8, 10 an O ring for waterproofing the joint between the housing member 1 and the storage member 8, 11 the aforementioned output terminal, and 12 the electrode terminal 4. A sealing material 13 is filled in the opening 8a, which is the connecting portion of the output terminal 11, to make the opening 8a waterproof. Reference numeral 13 is an air hole provided in the storage member 8 according to the present invention.
次に、上記のように構成されたこの加速度検出
器においてその動作について述べる。 Next, the operation of this acceleration detector configured as described above will be described.
まず、ハウジング部材１のネジ部１ａを内燃機
関等に取り付け、ハウジング部材１を被測定物と
同一モードで加速させる。ハウジング部材１のウ
エイト２との間に配された圧電素子３は、ハウジ
ング部材１に受ける加速力とウエイト２との慣性
力によつて厚み方向の力を受け、その加速力に比
例した加速度信号を発生する。圧電素子３に発生
したこの加速度信号は、一対の圧電素子３の間に
置かれた電極端子４により導き出される。この電
極端子４の一端は、収納部材８によつて保持され
る出力端子１１に接続され、上記検出出力は出力
端子１１を介して外部に導き出される。ここで、
チユーブ６及び７により各々ネジ５及び電極端子
４を絶縁し、電極端子４とネジ５、またウエイト
２との接触を防止している。この加速度検出器に
おいて、圧電素子３はインピーダンスが高いため
高湿度の雰囲気中に置かれた場合、圧電素子３に
発生した電荷のリークにより出力が低下し検出感
度が低下するという不具合が生じる。従つて防水
構造が要求され、０リング１０及びシール材１２
が必要となる。即ち、０リング１０をハウジング
部材１と収納部材８との接合面に挿入し、ハウジ
ング部材１と収納部材８との嵌合部の防水を行つ
ている。また、電極端子４と出力端子１１との接
続のために設けられた開口部８ａに気密性の高い
シール材１２を充填し防水を行つている。 First, the threaded portion 1a of the housing member 1 is attached to an internal combustion engine or the like, and the housing member 1 is accelerated in the same mode as the object to be measured. The piezoelectric element 3 disposed between the housing member 1 and the weight 2 receives a force in the thickness direction due to the acceleration force applied to the housing member 1 and the inertia force of the weight 2, and generates an acceleration signal proportional to the acceleration force. occurs. This acceleration signal generated in the piezoelectric element 3 is derived by an electrode terminal 4 placed between the pair of piezoelectric elements 3. One end of this electrode terminal 4 is connected to an output terminal 11 held by the storage member 8, and the detection output is led out via the output terminal 11. here,
The tubes 6 and 7 insulate the screw 5 and the electrode terminal 4, respectively, and prevent the electrode terminal 4 from coming into contact with the screw 5 or the weight 2. In this acceleration detector, since the piezoelectric element 3 has a high impedance, if it is placed in a high humidity atmosphere, the leakage of the charge generated in the piezoelectric element 3 causes a problem that the output decreases and the detection sensitivity decreases. Therefore, a waterproof structure is required, and the O-ring 10 and sealing material 12
Is required. That is, the O-ring 10 is inserted into the joint surface between the housing member 1 and the storage member 8, and the fitting portion between the housing member 1 and the storage member 8 is made waterproof. Further, the opening 8a provided for connecting the electrode terminal 4 and the output terminal 11 is filled with a highly airtight sealing material 12 to make it waterproof.
しかし、この防水方法のうちシール材１２を上
記の構造において使用する点には問題がある。即
ち、シール材１２は気密性の高いことが要求され
るため、例えばエポキシレジン等の脂肪材料が使
用される。これらのシール材１２の硬化は、例え
ば常温における自然乾燥では数ヶ月のもの日数を
要すため、このシール材の硬化を促進させる方法
として加熱乾燥が行われる。この加熱乾燥過程に
おいて、収納部内の大気が熱膨張するが、このと
きシール材１２はまだ硬化していないので、開口
部８ａとシール材１２との接合部分から、もしく
は、シール材１２の粘度が低い場合にはシール材
１２自体から空気漏れを生じ、この空気漏れの跡
がシール材１２の硬化後も収納部内９と外気の貫
通孔として残り、防水効果が失われるという不具
合が生じる。 However, in this waterproofing method, there is a problem in using the sealing material 12 in the above structure. That is, since the sealing material 12 is required to have high airtightness, a fatty material such as epoxy resin is used, for example. Since curing of these sealing materials 12 takes several months if air-dried at room temperature, for example, heating drying is performed as a method of accelerating the curing of the sealing materials. During this heating and drying process, the atmosphere inside the storage section thermally expands, but since the sealing material 12 has not yet hardened at this time, the viscosity of the sealing material 12 may be If it is low, air leakage occurs from the sealing material 12 itself, and even after the sealing material 12 hardens, traces of this air leakage remain as a through hole for connecting the inside of the storage section 9 and the outside air, causing a problem that the waterproofing effect is lost.
上記の不具合点を改良するため、本発明に係る
空気孔１３を収納部材８に設けた。即ち、この空
気孔１３により上記加熱乾燥過程における収納部
内９の熱膨張した空気が排出され、開口部８ａと
シール材１２との接合部分に、もしくはシール材
１２の粘度が低い場合にはシール材１２自体など
に収納部内９と外気との貫通孔を形成させること
なく、シール材１２の良好な硬化が達成され、シ
ール材１２の充填部分の完全な防水が行われると
いう効果が得られる。そして、この空気孔１３は
収納部内９の防水のため、シール材１２の乾燥後
この空気孔１３周辺の収納部材８の溶接、溶着等
により完全に封止される。 In order to improve the above-mentioned drawbacks, air holes 13 according to the present invention are provided in the storage member 8. That is, the air that has been thermally expanded in the storage part 9 during the heating and drying process is discharged through the air hole 13, and the air that has been thermally expanded in the storage part 9 during the heating and drying process is discharged, and the air that has been thermally expanded in the storage part 9 is discharged, and the air that has been thermally expanded in the storage part 9 during the heating drying process is discharged, and the sealing material is The sealing material 12 can be cured well without forming a through-hole in the storage part 9 and the outside air in the sealing material 12 itself, and the part filled with the sealing material 12 can be completely waterproofed. The air hole 13 is completely sealed by welding or welding the storage member 8 around the air hole 13 after the sealing material 12 is dried in order to waterproof the interior of the storage portion 9.
以上のようにこの発明は、加速度を検出する圧
電素子をウエイトとともにハウジング部材に固定
し、検出出力を導出するための出力端子を保持し
上記ハウジング部材に嵌合し上記圧電素子及びウ
エイトを収納する収納部材を備えた加速度検出器
の製造方法において、加熱乾燥過程に収納部材外
の空気流通を可能とするために上記収納部材に予
め空気孔を穿設した構成であるので、封止材の硬
化前の加熱乾燥過程において収納部内の熱膨張し
た空気によつて封止剤に空気漏れの微細孔を形成
させてしまうことや、封止剤と開口部との接合部
分に空気の流通する孔を形成させることはなくな
り、防水防湿効果が高まり、よつて圧電素子に発
生した電荷がリークし、検出出力が低下し、感度
が低下するということはなくなるという効果が得
られる。 As described above, in the present invention, a piezoelectric element for detecting acceleration is fixed to a housing member together with a weight, an output terminal for deriving a detection output is held, and the piezoelectric element and the weight are fitted into the housing member. In the method for manufacturing an acceleration detector equipped with a storage member, air holes are previously formed in the storage member to enable air circulation outside the storage member during the heating and drying process, so that hardening of the sealing material is difficult. In the previous heating and drying process, thermally expanded air inside the storage compartment may form micropores in the sealant that allow air to leak, or holes that allow air to flow through the joint between the sealant and the opening. This eliminates the possibility of formation of the piezoelectric element, improves the waterproof and moisture-proof effect, and eliminates the leakage of charges generated in the piezoelectric element, resulting in a decrease in detection output and sensitivity.
図は、本発明の一実施例を示す断面図である。
図において、１はハウジング部材、１ａはネジ
部、１ｂはカシメ部、２はウエイト、３は圧電素
子、４は電極端子、５はネジ、６はチユーブ、７
はチユーブ、８は収納部材、９は収納部内、１０
はＯリング、１１は出力端子、１２はシール材、
１３は空気孔である。
The figure is a sectional view showing one embodiment of the present invention. In the figure, 1 is a housing member, 1a is a screw part, 1b is a caulking part, 2 is a weight, 3 is a piezoelectric element, 4 is an electrode terminal, 5 is a screw, 6 is a tube, and 7
is the tube, 8 is the storage member, 9 is inside the storage section, 10
is an O-ring, 11 is an output terminal, 12 is a sealing material,
13 is an air hole.
Claims (1)
るハウジング部材と、このハウジング部材に気密
に取り付けられ、圧電素子とこの圧電素子に加速
力を与えるために連設されるウエイトと上記圧電
素子によつて検出された検出出力を取り出すため
の電極端子とを収納する収納部材と、この収納部
材に保持され、上記検出出力を上記収納部材外に
導出するように上記電極端子に接続される出力端
子と、上記収納部材に上記電極端子と上記出力端
子とを接続するために形成された開口部とを備え
た加速度検出器の製造方法において、上記収納部
材に予め空気孔を穿設しておき、上記開口部を加
熱硬化形の封止剤で封止した後、上記空気孔を封
止することを特徴とする加速度検出器の製造方
法。1. A housing member having an attachment part for attaching to an object to be measured, a piezoelectric element that is airtightly attached to the housing member, and a weight that is connected in series to apply acceleration force to the piezoelectric element, and the piezoelectric element. a storage member that stores an electrode terminal for taking out the detected detection output; an output terminal that is held in the storage member and connected to the electrode terminal so as to derive the detection output outside the storage member; In the method for manufacturing an acceleration detector, the storage member includes an opening formed for connecting the electrode terminal and the output terminal, wherein an air hole is formed in the storage member in advance, and the opening is formed in the storage member. A method of manufacturing an acceleration detector, comprising sealing the air hole with a thermosetting sealant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP693382A JPS58123464A (en) | 1982-01-19 | 1982-01-19 | Acceleration detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP693382A JPS58123464A (en) | 1982-01-19 | 1982-01-19 | Acceleration detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58123464A JPS58123464A (en) | 1983-07-22 |
| JPH0421823B2 true JPH0421823B2 (en) | 1992-04-14 |
Family
ID=11652047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP693382A Granted JPS58123464A (en) | 1982-01-19 | 1982-01-19 | Acceleration detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58123464A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07939Y2 (en) * | 1988-02-16 | 1995-01-11 | 株式会社本田ロック | Sealing structure for braking oil in acceleration detection device |
| JPH0727415Y2 (en) * | 1988-02-17 | 1995-06-21 | 三菱電機株式会社 | Sensor integrated unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4970668A (en) * | 1972-11-08 | 1974-07-09 |
-
1982
- 1982-01-19 JP JP693382A patent/JPS58123464A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58123464A (en) | 1983-07-22 |
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