JPH0285735A - Damping force detector for vehicle - Google Patents
Damping force detector for vehicleInfo
- Publication number
- JPH0285735A JPH0285735A JP23743688A JP23743688A JPH0285735A JP H0285735 A JPH0285735 A JP H0285735A JP 23743688 A JP23743688 A JP 23743688A JP 23743688 A JP23743688 A JP 23743688A JP H0285735 A JPH0285735 A JP H0285735A
- Authority
- JP
- Japan
- Prior art keywords
- damping force
- elements
- force
- piezoelectric element
- piston rod
- 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.)
- Pending
Links
- 238000013016 damping Methods 0.000 title claims abstract description 38
- 239000006096 absorbing agent Substances 0.000 claims abstract description 13
- 230000035939 shock Effects 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 abstract description 14
- 230000007423 decrease Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 229920001875 Ebonite Polymers 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Vehicle Body Suspensions (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、車両のショックアブソーバに作用する減衰力
の検出に有効な車両用減衰力検出器に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a damping force detector for a vehicle that is effective for detecting a damping force acting on a shock absorber of a vehicle.
［従来の技術］
従来より、圧電素子を応用して振動や歪等を検出する検
出器が知られている。このような検出器では、安定した
検出感度が得られるように、検出器を検出対象部分に取
り付ける必要がある。このような技術として、例えは、
「揚動検出器」 （実公昭５７−４５５３９号公報）等
が提案されている。すなわち、加圧された圧電素子を内
蔵した有底円筒状金属ケースの取付板に当接する取付座
面の径を圧電素子の直径と等しいか又は小さく構成し、
取付トルクの変化による感度変化、所謂、ベース歪感度
変化を小さく、安定させるものである。[Prior Art] Detectors that use piezoelectric elements to detect vibrations, distortion, etc. have been known. In such a detector, it is necessary to attach the detector to the detection target part so that stable detection sensitivity can be obtained. As an example of such technology,
A "lifting motion detector" (Japanese Utility Model Publication No. 57-45539) has been proposed. That is, the diameter of the mounting surface that comes into contact with the mounting plate of the bottomed cylindrical metal case containing the pressurized piezoelectric element is configured to be equal to or smaller than the diameter of the piezoelectric element,
This is to reduce and stabilize sensitivity changes due to changes in mounting torque, so-called base distortion sensitivity changes.
［発明が解決しようとする課題］
ところで、従来技術では、有底円筒状金属ケースの開放
口よりキャップを螺合して圧電素子に所定の圧力、所謂
、初期印加荷重を与えていた。しかし、例えば、車両走
行中の振動による螺合部の緩み、ｖＡ膨張率の相違する
螺合部材間での温度変化に起因する歪量の変化、螺合部
のなじみ等の経時変化等により、圧電素子への初期印加
荷重は変化、一般に減少する。すると、減衰力検出の精
度の低下を招致し、著しい場合は初期印加荷重の喪失に
より減衰力検出不能に到る場合も考えられ、信頼性が低
下するという問題もあった・本発明は、初期印加荷重を
好適に保持し、検出精度に優れると共に、信頼性も高い
車両用減衰力検出器の提供を目的とする。[Problems to be Solved by the Invention] In the prior art, a cap is screwed into the opening of a bottomed cylindrical metal case to apply a predetermined pressure, so-called initial applied load, to the piezoelectric element. However, for example, due to loosening of the threaded part due to vibrations while the vehicle is running, changes in the amount of strain due to temperature changes between the threaded parts with different vA expansion coefficients, changes over time such as the fitting of the threaded part, etc. The initial applied load on the piezoelectric element changes, generally decreasing. This may lead to a decrease in the accuracy of damping force detection, and in severe cases, it may become impossible to detect damping force due to the loss of the initial applied load, resulting in a decrease in reliability. It is an object of the present invention to provide a damping force detector for a vehicle that maintains an applied load appropriately, has excellent detection accuracy, and is highly reliable.
［課題を解決するための手段］
上記目的を達成するためになされた本発明は、シリンダ
および゛該シリンダと摺動自在に嵌合するピストンから
成るショックアブソーバの上記ピストンに連設されたピ
ストンロッドの内部に、該ピストンロッドと螺合する加
圧部材で押圧固定される車両用減衰力検出器であって、
上記ピストンロッドの歪に応じた電荷を発生する圧電素
子と、
該圧電素子と上記加圧部材との間に介在する弾性部材と
、
を備えたことを特徴とする車両用減衰力検出器を要旨と
するものである。[Means for Solving the Problems] The present invention, which has been made to achieve the above object, provides a shock absorber comprising a cylinder and a piston slidably fitted into the cylinder, and a piston rod connected to the piston. A damping force detector for a vehicle is press-fixed inside the piston rod by a pressurizing member screwed into the piston rod, the piezoelectric element generating an electric charge according to the strain of the piston rod, the piezoelectric element and the above. The gist of the present invention is a damping force detector for a vehicle, comprising: an elastic member interposed between the pressure member and the pressure member;
［作用］
本発明の車両用減衰力検出器は、ショックアブソーバの
ピストンロッド内部にピストンロッドと螺合する加圧部
材で押圧固定され、ピストンロッドの歪に応じた電荷を
発生する圧電素子と、加圧部材との間に介在する弾性部
材が、圧電素子に弾性押圧力を作用するよう働く。[Operation] The vehicle damping force detector of the present invention includes a piezoelectric element that is press-fixed inside the piston rod of a shock absorber by a pressure member that is threadedly engaged with the piston rod, and that generates an electric charge in accordance with the strain of the piston rod. An elastic member interposed between the pressure member and the pressure member acts to apply an elastic pressing force to the piezoelectric element.
すなわち、加圧部材の緩みにより、圧電素子への押圧力
が減少すると、両者間に介装された弾性部材が圧電素子
に弾性押圧力を作用させ、加圧部材による圧電素子への
初期印加荷重の変化を補償するのである。In other words, when the pressing force on the piezoelectric element decreases due to loosening of the pressing member, the elastic member interposed between the two applies an elastic pressing force to the piezoelectric element, and the initial load applied to the piezoelectric element by the pressing member decreases. It compensates for changes in
従って、本発明の車両用減衰力検出器は、初期印加荷重
の経時的減少を補償し、ショックアブソーバに作用する
減衰力を、長間間に亘って、高い精度で信頼性良く検出
するよう働く。Therefore, the vehicle damping force detector of the present invention compensates for the decrease in the initial applied load over time and works to detect the damping force acting on the shock absorber with high accuracy and reliability over a long period of time. .
［実施例コ
次に本発明の好適な実施例を図面に基づいて詳細に説明
する。本発明の実施例であるピエゾタイプ減衰力センサ
を内蔵した減衰力可変型ショックアブソーバの縦断面図
を第３図に示す。[Embodiment] Next, a preferred embodiment of the present invention will be described in detail based on the drawings. FIG. 3 shows a longitudinal sectional view of a variable damping force type shock absorber incorporating a piezo type damping force sensor, which is an embodiment of the present invention.
同図に示すように、減衰力可変型ショックアブソーバ１
は、シリンダ２の内部にピストン３が、軸方向（同図に
矢印Ａ、 Ｂで示す。）に指動自在に嵌合している。As shown in the figure, variable damping force type shock absorber 1
In the figure, a piston 3 is fitted inside the cylinder 2 so as to be freely movable in the axial direction (indicated by arrows A and B in the figure).
このピストン３は、ピストンロッド４の一端部に接続さ
れ、一方、ピストンロッド４の他瑞部はシャフト５に固
定されている。なお、シリンダ２はアウタシェル（外筒
）２ａに収容されており、アウタシェル２ａの下部はサ
スペンションブシュ２ｂを介して、車両のロワーアーム
２ｃに、一方、シャフト５の上部は、ベアリング６、防
振ゴム７を介して車体８に、各々接続されている。The piston 3 is connected to one end of a piston rod 4, while the other end of the piston rod 4 is fixed to a shaft 5. The cylinder 2 is housed in an outer shell 2a, and the lower part of the outer shell 2a is connected to a lower arm 2c of the vehicle via a suspension bushing 2b, while the upper part of the shaft 5 is connected to a bearing 6 and a vibration isolating rubber 7. are respectively connected to the vehicle body 8 via.
Ｒｇ方力可変ショックアブソーバ１の減衰力を変更する
ピエゾアクチュエータ１１、作用する減衰力を検出する
ピエゾタイプ減衰力センサ１２は、ピストンロッド４の
軸方向に穿設された中空部に内蔵されている。ピエゾタ
イプ減衰力センサ１２は、固定用ネジ２７で、ピストン
ロッド４の中空部に押圧固定されている。A piezo actuator 11 that changes the damping force of the Rg-force variable shock absorber 1 and a piezo type damping force sensor 12 that detects the acting damping force are built into a hollow portion bored in the axial direction of the piston rod 4. . The piezo type damping force sensor 12 is pressed and fixed to the hollow part of the piston rod 4 with a fixing screw 27.
次に、本発明の特徴をなすピエゾタイプ［ｆｉカセンサ
１２の構造を、第１図、第２図に基づいて説明する。ピ
エゾタイプＨｇ力センサ１は、第１図、第２図に示すよ
うに、ＰＺＴ等の圧電セラミ・ンクスから成り、円盤形
状で中央部に貫通孔を有する２個の圧電素子２１．２２
を、加圧して圧電面が発生する面を対向させて配設して
いる。両圧電素子２１．２２の正電荷発生面間には、銅
等の導電性金属で中央部に貫通孔を有する正電極板２３
が介装されている。圧電素子２１と固定用ネジ２７との
間には、中央部に貫通孔を有し、上下両面が平坦に仕上
げられた金属製、もしくは、セラミックス製のリテーナ
２５、中央部に貫通孔を有し、弾性力を発揮する皿バネ
２６が配設されている。なお、リテーナ２５の圧電素子
２１と接触する上面は、研磨され（１０点平均あらさて
３．２２程度）でいる。Next, the structure of the piezo type sensor 12, which is a feature of the present invention, will be explained based on FIGS. 1 and 2. As shown in FIGS. 1 and 2, the piezo type Hg force sensor 1 is made of piezoelectric ceramics such as PZT, and has two piezoelectric elements 21 and 22 that are disk-shaped and have a through hole in the center.
are arranged so that the surfaces on which a piezoelectric surface is generated by applying pressure are facing each other. Between the positive charge generating surfaces of both piezoelectric elements 21 and 22, there is a positive electrode plate 23 made of a conductive metal such as copper and having a through hole in the center.
is interposed. Between the piezoelectric element 21 and the fixing screw 27, there is a retainer 25 made of metal or ceramics, which has a through hole in the center and whose upper and lower surfaces are finished flat, and which has a through hole in the center. , a disc spring 26 exhibiting elastic force is provided. Note that the upper surface of the retainer 25 that comes into contact with the piezoelectric element 21 is polished (average of 10 points is about 3.22).
一方、圧電素子２１に対向する圧電素子２２の負電荷発
生面側には、銅等の導電性金属で中央部に貫通孔を有す
る負電極板２４が配設されている。On the other hand, on the negative charge generating surface side of the piezoelectric element 22 facing the piezoelectric element 21, a negative electrode plate 24 made of a conductive metal such as copper and having a through hole in the center is disposed.
第１図に示すように、１対のリード線２８．２９の各端
子２８ａ、２９ａは、正電極板２３、負電極板２４に、
各々接続され、他端部は、図示しない電子制御装置に接
続されている。As shown in FIG. 1, each terminal 28a, 29a of a pair of lead wires 28, 29 is connected to a positive electrode plate 23, a negative electrode plate 24,
The other end is connected to an electronic control device (not shown).
次に、ピエゾタイプ減衰力センサ１の作動を説明する。Next, the operation of the piezo type damping force sensor 1 will be explained.
車両が路面凹凸部を乗り越えると、ピストンロッド４に
圧縮力が作用する。この圧縮力の一部は、第１図に示す
ように、固定用ネジ２７、皿バネ２６、リテーナ２５の
各当接面を介して、ピエゾタイプＭ３カセンサ１２に作
用する。この作用力は、リテーナ２５から圧電素子２１
． ２２に伝達される。この伝達された作用力に応じた
電荷が、圧電素子２１．２２に発生し、正電極板２３、
負電極板２４からリード線２８．２９を介して、図示し
ない電子制ｆａｌｌ装置のチャージアンプに蓄電される
。従って、ピストン口・ンド４に作用する減衰力が検出
できるのである。なお、ピストンロッド４に、圧縮力に
よる歪が生じていない場合でも、圧電素子２１．２２に
は、固定用ネジ２７の締め付けにより、所定の初期印加
荷重が付与されている。この初期印加荷重は、ピストン
ロッド４に、軸方向の引っ張り、圧縮による歪が生じた
場合に、その歪を、初期印加荷重による歪からの変化と
して、安定した検出信号を得るためである。When the vehicle passes over an uneven road surface, a compressive force acts on the piston rod 4. As shown in FIG. 1, part of this compressive force acts on the piezo type M3 sensor 12 through the contact surfaces of the fixing screw 27, the disc spring 26, and the retainer 25. This acting force is applied from the retainer 25 to the piezoelectric element 21.
．． 22. Charges corresponding to this transmitted acting force are generated in the piezoelectric elements 21 and 22, and the positive electrode plate 23,
Power is stored from the negative electrode plate 24 via lead wires 28 and 29 in a charge amplifier of an electronically controlled fall device (not shown). Therefore, the damping force acting on the piston port/end 4 can be detected. Note that even when the piston rod 4 is not strained by compressive force, a predetermined initial load is applied to the piezoelectric elements 21 and 22 by tightening the fixing screws 27. The purpose of this initial applied load is to obtain a stable detection signal by using the strain as a change from the strain caused by the initial applied load when the piston rod 4 is strained due to axial tension or compression.
この初期印加荷重は、皿バネ２Ｇの変位量（たわみ）で
定めても良いし、圧電素子２１．２２の出力電荷に基づ
いて設定しても良い。なお、固定用ネジ２７が緩んだ場
合には、皿バネ２６の発生する弾性力により、初期印加
荷重の減少を充分抑制するよう構成されている。This initial applied load may be determined by the amount of displacement (deflection) of the disc spring 2G, or may be set based on the output charges of the piezoelectric elements 21 and 22. In addition, when the fixing screw 27 becomes loose, the elastic force generated by the disc spring 26 is configured to sufficiently suppress a decrease in the initial applied load.
なお本実施例において、ピエゾタイプ減衰力センサ１２
が車両用減衰力検出器に、圧電素子２１゜２２が圧電素
子に、皿バネ２６が弾性部材に、各々該当する。In this embodiment, the piezo type damping force sensor 12
corresponds to a vehicle damping force detector, the piezoelectric elements 21 and 22 correspond to piezoelectric elements, and the disc spring 26 corresponds to an elastic member.
以上説明したように本実施例によれは、ピエゾタイプ減
衰力センサ１２の圧電素子２１．２２を押圧する固定用
ネジ２７が緩むと、皿バネ２Ｇが弾性力を発揮し、初期
印加荷重の減少を抑制しているため、圧電素子２１．２
２が圧密に作動できるので、ピストンロッド４に発生す
る歪を正確に測定でき、減衰力可変型ショックアブソー
バ１に作用する減衰力の検出精度および信頼性・耐久性
を向上できる。As explained above, according to this embodiment, when the fixing screw 27 that presses the piezoelectric element 21, 22 of the piezo type damping force sensor 12 is loosened, the disc spring 2G exerts an elastic force, reducing the initial applied load. Since the piezoelectric element 21.2
2 can operate in a compressive manner, the strain generated in the piston rod 4 can be accurately measured, and the detection accuracy, reliability, and durability of the damping force acting on the variable damping force type shock absorber 1 can be improved.
また、固定用ネジ２７からの押圧力を平坦度の高い面同
志の接触によりリテーナ２５を介して圧電素子２１．２
２に印加しているため、圧電素子２１．２２に荷重が片
当りしないので、圧電素子２１．２２の破損を防止でき
る。In addition, the pressing force from the fixing screw 27 is applied to the piezoelectric element 21.2 via the retainer 25 by contacting the surfaces with high flatness.
2, the load does not hit the piezoelectric elements 21, 22 unevenly, and therefore damage to the piezoelectric elements 21, 22 can be prevented.
ざらに、圧電素子２１は、リテーナ２５を介して皿バネ
２６および固定用ネジ２７の押圧力を受けているので、
押圧力が接触面全面に均一に分散され、圧電素子２１の
接触面の特定部位に応力が集中して作用するのを防止で
きる。Roughly speaking, since the piezoelectric element 21 receives the pressing force from the disc spring 26 and the fixing screw 27 via the retainer 25,
The pressing force is uniformly distributed over the entire contact surface, and stress can be prevented from concentrating and acting on a specific portion of the contact surface of the piezoelectric element 21.
なお、本実施例では、弾性部材として皿バネ２６を使用
した。しかし、例えは、実装空間が有る場合はコイルス
プリング、非線形コイルスプリング等のスプリング、あ
るいは、硬質ゴム、ウレタン等、弾性特性を示す物質に
より実現することもできる。Note that in this embodiment, a disc spring 26 was used as the elastic member. However, if there is a mounting space, it can also be realized using a spring such as a coil spring or a nonlinear coil spring, or a material exhibiting elastic properties such as hard rubber or urethane.
また、本実施例では、正電極板２３、負電極板２４を備
えた構成とした。しかし、例えは、圧電素子２１．２２
の正電荷発生面に、形成された凹部に印刷等で正電極部
を形成し、一方、負電極は圧電素子２２とピストンロッ
ド４との接触面とすると、正負両型極板を備えない構成
により実現できる。Further, in this embodiment, a configuration including a positive electrode plate 23 and a negative electrode plate 24 was adopted. However, the piezoelectric element 21.22
If a positive electrode part is formed by printing or the like in the recess formed on the positive charge generating surface of the , and the negative electrode is the contact surface between the piezoelectric element 22 and the piston rod 4, a configuration that does not include both positive and negative type electrode plates can be achieved. This can be achieved by
また、本実施例では、圧電素子は２個使用する構成とし
たが、例えは、さらに多数の圧電素子を電極板と交互に
ｆ１層する構成とすることもできる。Further, in this embodiment, two piezoelectric elements are used, but for example, a larger number of piezoelectric elements may be arranged alternately with the electrode plates in the f1 layer.
［発明の効果］
以上詳記したように本発明の車両用）戒衰力検出器は、
加圧部材の緩みにより、圧電素子への押圧力が減少する
と、両者間に介装された弾性部材が圧電素子に弾性押圧
力を作用させ、加圧部材による圧電素子への初期印加荷
重の変化を補償するよう構成されている。このため、初
期印加荷重の経時的減少を補償できるので、ショックア
ブソーバに作用するｍｓ力の検出精度が飛躍的に向上す
ると共に、信頼性も高まるという優れた効果を奏する。[Effects of the Invention] As detailed above, the damping force detector for vehicles of the present invention has the following effects:
When the pressing force on the piezoelectric element decreases due to loosening of the pressure member, the elastic member interposed between the two applies an elastic pressing force to the piezoelectric element, causing a change in the initial load applied to the piezoelectric element by the pressure member. It is designed to compensate for Therefore, since it is possible to compensate for the decrease over time in the initial applied load, the detection accuracy of the ms force acting on the shock absorber is dramatically improved, and reliability is also improved.
第１図は本発明一実施例であるピエゾタイプ減衰力セン
サの縦断面図、第２図は同じくその構造を示す分解図、
第３図は同じくそのピエゾタイプ減衰力センサを内蔵し
た減衰力可変型ショックアブソーバの構造を示す縦断面
図である。
１、・、減衰力可変僧ショ・ンクアブソーバ、４・・・
ピストンロッド、１２・・・ピエゾタイプ減衰力センサ
、２１．２２・・・圧電素子、２３・・・正電極板、２
４・・・＠電極板、２５・・・リテーナ、２日・・・皿
バネ、２７・・・固定用ネジFIG. 1 is a vertical sectional view of a piezo type damping force sensor which is an embodiment of the present invention, and FIG. 2 is an exploded view showing the structure thereof.
FIG. 3 is a longitudinal cross-sectional view showing the structure of a variable damping force shock absorber incorporating the same piezo type damping force sensor. 1. Variable damping force damping absorber, 4...
Piston rod, 12... Piezo type damping force sensor, 21.22... Piezoelectric element, 23... Positive electrode plate, 2
4...@electrode plate, 25...retainer, 2nd...disc spring, 27...fixing screw
Claims (1)
ストンから成るショックアブソーバの上記ピストンに連
設されたピストンロッドの内部に、該ピストンロッドと
螺合する加圧部材で押圧固定される車両用減衰力検出器
であつて、 上記ピストンロッドの歪に応じた電荷を発生する圧電素
子と、 該圧電素子と上記加圧部材との間に介在する弾性部材と
、 を備えたことを特徴とする車両用減衰力検出器。[Scope of Claims] 1. A shock absorber consisting of a cylinder and a piston that is slidably fitted into the cylinder. Pressure is applied to the inside of a piston rod that is connected to the piston with a pressure member that is threadedly engaged with the piston rod. A fixed damping force detector for a vehicle, comprising: a piezoelectric element that generates an electric charge according to the strain of the piston rod; and an elastic member interposed between the piezoelectric element and the pressure member. A damping force detector for a vehicle characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23743688A JPH0285735A (en) | 1988-09-21 | 1988-09-21 | Damping force detector for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23743688A JPH0285735A (en) | 1988-09-21 | 1988-09-21 | Damping force detector for vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0285735A true JPH0285735A (en) | 1990-03-27 |
Family
ID=17015333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23743688A Pending JPH0285735A (en) | 1988-09-21 | 1988-09-21 | Damping force detector for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0285735A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5138885A (en) * | 1990-03-16 | 1992-08-18 | Matsushita Electric Industrial Co., Ltd. | Piezoelectric-type pressure sensor |
| US7466339B2 (en) | 2003-04-24 | 2008-12-16 | Denso Corporation | Vehicle-mounted camera apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5745539U (en) * | 1980-08-30 | 1982-03-13 | ||
| JPS636238A (en) * | 1986-06-25 | 1988-01-12 | Nippon Soken Inc | Damping force control device of shock absorber |
-
1988
- 1988-09-21 JP JP23743688A patent/JPH0285735A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5745539U (en) * | 1980-08-30 | 1982-03-13 | ||
| JPS636238A (en) * | 1986-06-25 | 1988-01-12 | Nippon Soken Inc | Damping force control device of shock absorber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5138885A (en) * | 1990-03-16 | 1992-08-18 | Matsushita Electric Industrial Co., Ltd. | Piezoelectric-type pressure sensor |
| US7466339B2 (en) | 2003-04-24 | 2008-12-16 | Denso Corporation | Vehicle-mounted camera apparatus |
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