JPH034108B2 - - Google Patents
Info
- Publication number
- JPH034108B2 JPH034108B2 JP6583884A JP6583884A JPH034108B2 JP H034108 B2 JPH034108 B2 JP H034108B2 JP 6583884 A JP6583884 A JP 6583884A JP 6583884 A JP6583884 A JP 6583884A JP H034108 B2 JPH034108 B2 JP H034108B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic fluid
- case
- generating means
- magnetic
- medium
- 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
Links
- 239000011553 magnetic fluid Substances 0.000 claims description 30
- 230000005389 magnetism Effects 0.000 claims description 17
- 230000001133 acceleration Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000005291 magnetic effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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
- G01P15/11—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 inductive pick-up
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Fluid-Damping Devices (AREA)
Description
【発明の詳細な説明】
この発明は、自動車等の移動体の加速度を検出
するセンサに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sensor that detects the acceleration of a moving object such as an automobile.
従来、加速度センサとして、例えば実開昭58−
27772号公報に示されているように、ハウジング
内で可動鉄心をばね等から成る機械的支持機構を
介して支持し、この可動鉄心が慣性力を受けて変
位する量を差動トランスで検出することが公知と
なつている。しかしながら、かかる加速度センサ
においては、前記可動鉄心を機械的支持機構によ
り支持しているので、その機構部が複雑で損傷し
やすく、加速度センサの信頼性を阻害するという
欠点があつた。 Conventionally, as an acceleration sensor, for example,
As shown in Publication No. 27772, a movable core is supported within a housing via a mechanical support mechanism consisting of a spring, etc., and a differential transformer detects the amount of displacement of this movable core due to inertial force. It has become publicly known. However, in such an acceleration sensor, since the movable iron core is supported by a mechanical support mechanism, the mechanical part thereof is complicated and easily damaged, which impairs the reliability of the acceleration sensor.
そこで、この発明は、上述したように磁性体た
る可動鉄心を支持する機構部が複雑であることに
起因する従来の欠点を解消し、信頼性が高い加速
度センサを提供することを課題とし、その要旨と
するところは、磁性流体、及び該磁性流体と混じ
らず且つ該磁性流体と比重の異なる媒体をケース
に封入すると共に、前記磁性流体に一定の磁気を
与えて前記磁性流体を筒状とする定磁気発生手段
を設け、さらに前記磁性流体の位置を検出する検
出手段を設けたことにある。したがつて、磁性流
体の動きで加速度を検出する方式であるから、磁
性流体を媒体と共にケースに封入すれば足り、そ
のため、上記課題を達成することができるもので
ある。 Therefore, the object of this invention is to provide a highly reliable acceleration sensor that eliminates the conventional drawbacks caused by the complexity of the mechanical part that supports the movable core, which is a magnetic material, as described above. The gist is that a magnetic fluid and a medium that does not mix with the magnetic fluid and has a different specific gravity from the magnetic fluid are sealed in a case, and a certain magnetism is applied to the magnetic fluid to make the magnetic fluid into a cylindrical shape. A constant magnetism generating means is provided, and a detecting means for detecting the position of the magnetic fluid is further provided. Therefore, since the method detects acceleration based on the movement of the magnetic fluid, it is sufficient to enclose the magnetic fluid together with the medium in the case, and therefore the above-mentioned problem can be achieved.
以下、この発明の実施例を図面により説明す
る。 Embodiments of the present invention will be described below with reference to the drawings.
第１図、第２図において、この発明の一実施例
が示され、加速度センサは、後述する磁性流体１
及び媒体２を封入するケース３を有し、このケー
ス３は非磁性材から成り、有底円筒状のパイプ部
４と、該パイプ部４の開口端にねじ止めされたボ
ルト部５とから構成されている。このボルト部５
の先端やや手前には環状のＯリング溝６が形成さ
れ、このＯリング溝６にＯリング７が装着され、
このＯリング７によりケース３内の気密を保つよ
うにしてあり、媒体２の酸化を防止するようにな
つている。 1 and 2, one embodiment of the present invention is shown, and the acceleration sensor includes a magnetic fluid 1 which will be described later.
and a case 3 for enclosing the medium 2, and the case 3 is made of a non-magnetic material and is composed of a bottomed cylindrical pipe part 4 and a bolt part 5 screwed to the open end of the pipe part 4. has been done. This bolt part 5
An annular O-ring groove 6 is formed slightly in front of the tip, and an O-ring 7 is attached to this O-ring groove 6.
This O-ring 7 keeps the interior of the case 3 airtight and prevents the medium 2 from oxidizing.
磁性流体１は、例えば直径が100Å程度の強磁
性体粒子Fe3O4を水や油等の種々の溶媒中に高濃
度で分散させたコロイド状の液体で、磁場を作用
させても磁性体粒子の沈降や凝集が起こらず、見
掛け上液体自身が磁性をもつているように振る舞
うものである。 The magnetic fluid 1 is a colloidal liquid in which ferromagnetic particles Fe 3 O 4 with a diameter of about 100 Å are dispersed at a high concentration in various solvents such as water and oil. Particles do not settle or aggregate, and the liquid appears to behave as if it were magnetic.
また、媒体２は、例えば水等の液体又は窒素ガ
ス、アルゴンその他の不活性ガス、空気等の気体
で、前記磁性流体１と混じらず且す磁性流体１と
比重が異なるもので、この比重の大小に応じて加
速度センサの感度を調整することができ、比重が
小さい程感度を上げることができる。そして、こ
の磁性流体１と媒体２とは所定の比率（例えば１
対２）に設定されている。 The medium 2 is, for example, a liquid such as water, a gas such as nitrogen gas, argon or other inert gas, or air, which does not mix with the magnetic fluid 1 and has a specific gravity different from that of the magnetic fluid 1. The sensitivity of the acceleration sensor can be adjusted depending on the size, and the sensitivity can be increased as the specific gravity is smaller. The magnetic fluid 1 and the medium 2 are mixed at a predetermined ratio (for example, 1
vs. 2).
前記ケース３の周囲は、同じく非磁性材から成
るハウジング８と蓋体９とに覆われ、ケース３の
パイプ部４の底部がハウジング８の底部に形成さ
れた嵌合溝９に嵌合していると共に、ボルト部５
の頭部が蓋体９に当接し、ハウジング８に形成さ
れた複数の爪２２が蓋体９にかしめ付けられて、
ケース３がハウジング８と蓋体９とに挾持されて
いる。そして、ケース３とハウジング８との間の
空間に下記する検出手段１０と定磁気発生手段１
１とが配置されている。 The periphery of the case 3 is covered with a housing 8 and a lid 9 made of a non-magnetic material, and the bottom of the pipe portion 4 of the case 3 is fitted into a fitting groove 9 formed at the bottom of the housing 8. At the same time, the bolt part 5
The head of the housing 8 contacts the lid 9, and the plurality of claws 22 formed on the housing 8 are caulked to the lid 9.
A case 3 is held between a housing 8 and a lid 9. Then, in the space between the case 3 and the housing 8, a detection means 10 and a constant magnetism generation means 1 described below are provided.
1 are arranged.
検出手段１０は、この実施例においては、差動
トランス１２，１２から構成されている。この差
動トランス１２，１２は、それぞれ一次巻線と二
次巻線とが非導電材から成る巻枠１３に巻かれ、
この巻枠１３がケース３のパイプ部４に外嵌され
ていると共に、該巻枠１３の一端が前記ハウジン
グ８の底部に、他端が前記パイプ部４の外周に形
成された段部１４にそれぞれ当接して固定されて
いる。そして、該差動トランス１２，１２のリー
ド線１５が前記蓋体９に設けられたコネクタ１６
に接続され、前記磁性流体１が変位すると、差動
トランス１２，１２のインダクタンスが変化して
その変位量を二次側の電圧値として検出し、コネ
クタ１６を介してコントロールユニツト１８に出
力し、該コントロールユニツト１８で例えばデジ
タル値に変換されて表示器１９に表示するように
なつている。尚、加速方向が１つであれば差動ト
ランスも１つで足りる。 The detection means 10 is composed of differential transformers 12, 12 in this embodiment. The differential transformers 12, 12 each have a primary winding and a secondary winding wound around a winding frame 13 made of a non-conductive material.
This winding frame 13 is fitted onto the pipe portion 4 of the case 3, and one end of the winding frame 13 is attached to the bottom of the housing 8, and the other end is attached to a stepped portion 14 formed on the outer periphery of the pipe portion 4. They are fixed in contact with each other. The lead wires 15 of the differential transformers 12, 12 are connected to a connector 16 provided on the lid 9.
When the magnetic fluid 1 is displaced, the inductance of the differential transformers 12, 12 changes, the amount of displacement is detected as a voltage value on the secondary side, and is outputted to the control unit 18 via the connector 16. The control unit 18 converts it into a digital value, for example, and displays it on a display 19. Note that if there is one acceleration direction, one differential transformer is sufficient.
また、定磁気発生手段１１は、この実施例にお
いては、リング状の永久磁石から構成され、この
永久磁石が差動トランス１２，１２の中央外周を
覆つていると共に、該永久磁石の一端が前記ハウ
ジング８に形成された段部１７に、他端が非磁性
材から成る押え部材２０にそれぞれ当接し、さら
にこの押え部材２０の他端が前記蓋体９に当接し
て固定されている。しかして、この定磁気発生手
段１１のにより前記ケース３内の磁性流体１に磁
気が与えられ、磁性流体１は、ケース３内の中心
に集まると共に、筒状となつてその中心部には通
路２１が形成されるようになる。尚、この定磁気
発生手段１１は永久磁石の他に電磁磁石であつて
もよい。 Further, in this embodiment, the constant magnetism generating means 11 is composed of a ring-shaped permanent magnet, and this permanent magnet covers the center outer periphery of the differential transformers 12, 12, and one end of the permanent magnet is The other end of the stepped portion 17 formed in the housing 8 abuts a presser member 20 made of a non-magnetic material, and the other end of the presser member 20 abuts and is fixed to the lid 9. Therefore, magnetism is applied to the magnetic fluid 1 in the case 3 by the constant magnetism generating means 11, and the magnetic fluid 1 gathers at the center of the case 3 and becomes cylindrical, with a passageway in the center. 21 will be formed. Note that this constant magnetism generating means 11 may be an electromagnetic magnet in addition to a permanent magnet.
上記構成において、加速されていない場合に
は、磁性流体１は、定磁気発生手段１１によつて
形成される磁界を中心として集まるので、差動ト
ランス１２，１２のインダクタンスは変化せず、
その二次側の出力端子には一定の電圧が誘起さ
れ、表示器１９には加速度が０であることが示さ
れる。 In the above configuration, when it is not accelerated, the magnetic fluid 1 gathers around the magnetic field formed by the constant magnetism generating means 11, so the inductance of the differential transformers 12, 12 does not change,
A constant voltage is induced at the output terminal on the secondary side, and the display 19 shows that the acceleration is zero.
そして、左右いずれか一方に加速されると、磁
性流体１がその加速方向とは逆の方向へ慣性力を
受けるので、媒体２が通路２１を介して一方から
他方へ逃げながら、磁性流体１が定磁気発生手段
１１の磁気により受ける磁力に抗して変位する。
これにより差動トランス１２，１２のインダクタ
ンスが変化し、二次側出力端子には加速度に対応
する電圧が誘起され、コントロールユニツト１８
を介して表示器１９に加速度を表示するものであ
る。 When the magnetic fluid 1 is accelerated in either the left or right direction, the magnetic fluid 1 receives an inertial force in the direction opposite to the acceleration direction. It is displaced against the magnetic force received by the magnetism of the constant magnetism generating means 11.
As a result, the inductance of the differential transformers 12, 12 changes, a voltage corresponding to the acceleration is induced at the secondary output terminal, and the control unit 18
The acceleration is displayed on the display 19 via the display 19.
尚、上記実施例においては、永久磁石たる定磁
気発生手段１１を検出手段１０の外側に配置した
が、他の実施例として、定磁気発生手段１１を検
出手段１０の内側に配置してもよく、この場合に
は定磁気発生手段１１が磁性流体１に近づくの
で、磁性流体１を抑える力を向上させることがで
きるものである。 In the above embodiment, the constant magnetism generating means 11, which is a permanent magnet, is arranged outside the detecting means 10, but in other embodiments, the constant magnetism generating means 11 may be arranged inside the detecting means 10. In this case, since the constant magnetism generating means 11 approaches the magnetic fluid 1, the force for suppressing the magnetic fluid 1 can be improved.
以上述べたように、この発明によれば、磁性流
体を用いて検出部分における機械的な支持機構を
不要にしたので、故障を少なくして信頼性を向上
させることができる。また、磁性流体は定磁気発
生手段により筒状となるようにしたので、媒体の
逃げがよく、感度を向上させることができる。さ
らに、上述したように機械的な支持機構を不要に
したので、小型、軽量とすることができ、構造も
簡単であるから安価なものとすることができる等
の効果を奏するものである。 As described above, according to the present invention, since the magnetic fluid is used to eliminate the need for a mechanical support mechanism in the detection portion, it is possible to reduce failures and improve reliability. In addition, since the magnetic fluid is made into a cylindrical shape by the constant magnetism generating means, the medium can easily escape and the sensitivity can be improved. Furthermore, since the mechanical support mechanism is not required as described above, the device can be made small and lightweight, and the structure is simple, so it can be made at low cost.
第１図はこの発明の一実施例を示す縦断面図、
第２図は同上の側面図である。
１……磁性流体、２……媒体、３……ケース、
１０……検出手段、１１……定磁気発生手段。
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
FIG. 2 is a side view of the same as above. 1...Magnetic fluid, 2...Medium, 3...Case,
10...detection means, 11...constant magnetism generation means.
Claims (1)
磁性流体と比重の異なる媒体をケースに封入する
と共に、前記磁性流体に一定の磁気を与えて前記
磁性流体を筒状とする定磁気発生手段を設け、さ
らに前記磁性流体の位置を検出する検出手段を設
けたことを特徴とする加速度センサ。1. Constant magnetism generating means that encloses a magnetic fluid and a medium that does not mix with the magnetic fluid and has a specific gravity different from that of the magnetic fluid in a case, and applies a certain magnetism to the magnetic fluid to make the magnetic fluid cylindrical. An acceleration sensor, further comprising a detection means for detecting the position of the magnetic fluid.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6583884A JPS60233564A (en) | 1984-04-04 | 1984-04-04 | Acceleration sensor |
| DE19853510987 DE3510987C2 (en) | 1984-03-29 | 1985-03-27 | Accelerometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6583884A JPS60233564A (en) | 1984-04-04 | 1984-04-04 | Acceleration sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60233564A JPS60233564A (en) | 1985-11-20 |
| JPH034108B2 true JPH034108B2 (en) | 1991-01-22 |
Family
ID=13298551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6583884A Granted JPS60233564A (en) | 1984-03-29 | 1984-04-04 | Acceleration sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60233564A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6312771U (en) * | 1986-07-10 | 1988-01-27 | ||
| JPH0697236B2 (en) * | 1987-05-30 | 1994-11-30 | 株式会社日本自動車部品総合研究所 | Acceleration sensor |
| JPH0650775Y2 (en) * | 1988-03-04 | 1994-12-21 | エヌオーケー株式会社 | Acceleration sensor |
| JPH0632626Y2 (en) | 1988-07-28 | 1994-08-24 | 株式会社ゼクセル | Sensor |
| JPH0277654A (en) * | 1988-09-14 | 1990-03-16 | Nippon Seiko Kk | shock sensor |
-
1984
- 1984-04-04 JP JP6583884A patent/JPS60233564A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60233564A (en) | 1985-11-20 |
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