JPH0418167B2 - - Google Patents
Info
- Publication number
- JPH0418167B2 JPH0418167B2 JP18190586A JP18190586A JPH0418167B2 JP H0418167 B2 JPH0418167 B2 JP H0418167B2 JP 18190586 A JP18190586 A JP 18190586A JP 18190586 A JP18190586 A JP 18190586A JP H0418167 B2 JPH0418167 B2 JP H0418167B2
- Authority
- JP
- Japan
- Prior art keywords
- piston rod
- braking
- voltage
- electrostrictive element
- braking device
- 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
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/28—Electric or magnetic using electrostrictive or magnetostrictive elements, e.g. piezoelectric elements
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Actuator (AREA)
- Braking Arrangements (AREA)
Description
【発明の詳細な説明】
技術分野
本考案は制動装置付シリンダーに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a cylinder with a brake device.
従来技術
ピストンロツドの動きを制動する制動装置付シ
リンダーは公知である。BACKGROUND OF THE INVENTION Braking cylinders for braking the movement of piston rods are known.
従来のシリンダーではピストンロツドに偏心カ
ムを嵌装し、そしてカムの回転によりピストンロ
ツドを半径方向に偏心させる力を作用して摩擦制
動する方法等が講じられている。 In conventional cylinders, a method has been adopted in which an eccentric cam is fitted to the piston rod, and the rotation of the cam applies a force that makes the piston rod eccentric in the radial direction, thereby achieving frictional braking.
従来の制動装置付シリンダーは構造が複雑にな
つたり、ピストンロツドに無理な力を加えて歪を
生じたりする問題があつた。 Conventional brake cylinders have problems in that they have a complicated structure and that excessive force is applied to the piston rod, causing distortion.
目 的
本発明は構造が簡単で各部に無理な変形を与え
るような事がなく、しかも確実に制動可能なシリ
ンダーを提供することを目的としている。Purpose The purpose of the present invention is to provide a cylinder that has a simple structure, does not cause excessive deformation to any part, and can be braked reliably.
構 成
本発明は上記の目的をピストンロツドに電歪素
子を嵌装し、該電歪素子に電圧印加装置により電
圧を印加し、電歪素子を膨張又は収縮させること
によりピストンロツドを緊締又は弛緩することに
より達成した。Structure The above object of the present invention is to fit an electrostrictive element into a piston rod, apply a voltage to the electrostrictive element by a voltage application device, and expand or contract the electrostrictive element to tighten or loosen the piston rod. Achieved by
本発明の構成及び作用の詳細を図に示す実施例
に基づいて説明する。 The structure and operation of the present invention will be explained in detail based on the embodiment shown in the drawings.
第１図及び第２図においてシリンダチユーブ１
にピストン２が摺動可能に収容され、該ピストン
２に固定されたピストンロツド３はシリンダチユ
ーブ１に固定されたロツドカバー４を貫通して外
部に突出している。ロツドカバー４に形成された
出入口５及びシリンダチユーブ１に固定されたヘ
ツドカバー６に形成された出入口７に交互に加圧
流体を供給排出することによりピストン２が往復
動される。 In Figures 1 and 2, cylinder tube 1
A piston 2 is slidably housed in the piston 2, and a piston rod 3 fixed to the piston 2 passes through a rod cover 4 fixed to the cylinder tube 1 and projects to the outside. The piston 2 is reciprocated by alternately supplying and discharging pressurized fluid to an inlet/outlet 5 formed in the rod cover 4 and an inlet/outlet 7 formed in a head cover 6 fixed to the cylinder tube 1.
ロツドカバー４に固定されるブレーキケーシン
グ８の中に制動装置９が収容される。 A brake device 9 is housed in a brake casing 8 fixed to the rod cover 4.
制動装置９はピストンロツド３に嵌装された円
筒状ブレーキシユー１０と該円筒状ブレーキシユ
ー１０のまわりに嵌装され、ピストンロツドの軸
線方向に層状に並置された複数のリング状電歪素
子１１と該電歪素子の間に形成された電極１２と
該電極１２に接続される電線１３，１４と該電線
１３，１４に接続される電圧印加装置１５とを有
する。 The braking device 9 includes a cylindrical brake shoe 10 fitted to the piston rod 3 and a plurality of ring-shaped electrostrictive elements 11 fitted around the cylindrical brake shoe 10 and arranged in layers in the axial direction of the piston rod. and an electrode 12 formed between the electrostrictive element, electric wires 13 and 14 connected to the electrode 12, and a voltage application device 15 connected to the electric wires 13 and 14.
円筒状ブレーキシユー１０はスリツト１６を有
し、ピストンロツド３に対する締付力を半径方向
の変形により容易に変えることができるようにす
るのがよい。スリツト１６は軸線方向に延びる１
本のスリツトでもよく複数のスリツトを千鳥状に
多数配列してもよく、周方向に収縮しやすい形状
なら適宜選定できる。場合によつては円筒状ブレ
ーキシユー１０を省略しリング状電歪素子をベレ
ーキシユーと兼用させることもできる。 The cylindrical brake shoe 10 preferably has a slit 16 so that the clamping force on the piston rod 3 can be easily varied by radial deformation. The slit 16 extends in the axial direction.
It may be a book slit, or a plurality of slits may be arranged in a staggered manner, and any shape that is easily contracted in the circumferential direction can be selected as appropriate. In some cases, the cylindrical brake shoe 10 may be omitted and the ring-shaped electrostrictive element may also be used as the brake shoe.
電歪素子１１間の電極１２は交互に電線１４に
より電圧印加装置の（＋）極に接続されるものと
電線１３により電圧印加装置１５の（−）極に接
続されるものとに分けられる。各電歪素子１１に
は周縁の一部に電線１３を通すことのできる凹部
１７と電線１４を通すことのできる凹部１８とが
形成される。 The electrodes 12 between the electrostrictive elements 11 are alternately divided into those connected to the (+) pole of the voltage application device by electric wires 14 and those connected to the (−) pole of the voltage application device 15 by electric wires 13. A recess 17 through which the electric wire 13 can pass and a recess 18 through which the electric wire 14 can pass are formed in a part of the periphery of each electrostrictive element 11.
ブレーキシユー１０又は電歪素子１１の内周と
ピストンロツド３の外周を互いに嵌合する円筒状
とするのに対し、第３図に示すように多角形に形
成し、ブレーキシユー１０又は電歪素子１１とピ
ストンロツド３との間を相対回転できないように
することもできる。 While the inner periphery of the brake shoe 10 or the electrostrictive element 11 and the outer periphery of the piston rod 3 are formed into a cylindrical shape that fits into each other, they are formed into a polygonal shape as shown in FIG. It is also possible to prevent relative rotation between the element 11 and the piston rod 3.
制動装置９は普通はピストンロツド３に対して
は遊び嵌めされ、ピストンロツド３の自由回転を
保証するように形成した電歪素子１１を用い、制
動したいときは電圧印加装置１５により電圧を印
加して電歪素子１１に収縮歪を起こさせて直接又
はブレーキシユー１０を介してピストンロツド３
を緊締する構造とすることもできるが、逆に普通
はピストンロツド３を緊締するようにブレーキシ
ユー１０に締り嵌めされた電歪素子１１を用い、
電圧を印加することにより電歪素子１１に膨張歪
を起こさせてピストンロツド３に対する緊締力を
解除してピストンロツド３を自由に回動できるよ
うに構成することもできる。後者の場合は無電圧
時に制動作用をするので停電時や工場休止等の際
にピストンロツドの移動を防ぎたい場合に好都合
であり、安全なブレーキとして作用する。 The braking device 9 is normally loosely fitted to the piston rod 3, and uses an electrostrictive element 11 formed to ensure free rotation of the piston rod 3. When braking is desired, a voltage is applied by the voltage applying device 15. The piston rod 3 is caused to cause contraction strain in the strain element 11 directly or via the brake shoe 10.
It is also possible to have a structure that tightens the piston rod 3, but on the other hand, normally an electrostrictive element 11 tightly fitted to the brake shoe 10 is used to tighten the piston rod 3.
It is also possible to configure the electrostrictive element 11 to cause expansion strain by applying a voltage to release the tightening force on the piston rod 3 so that the piston rod 3 can freely rotate. In the latter case, the braking action is performed when there is no voltage, so it is convenient when it is desired to prevent the piston rod from moving during a power outage or factory suspension, and it acts as a safe brake.
電歪素子としてはセラミツク薄板を積層接着し
て形成される圧電アクチユエータ等が知られてい
る。 As an electrostrictive element, a piezoelectric actuator formed by laminating and bonding thin ceramic plates is known.
電歪素子は大出力、小変形の特性を有するので
上記の制動装置には最も適している。 Since the electrostrictive element has the characteristics of high output and small deformation, it is most suitable for the above-mentioned braking device.
制動装置の電圧印加装置は所定の電圧を直接印
加して制動状態と制動解除状態との間の切換を行
うのに対し、制動開始、制動解除を徐々に行うよ
うにすると、ピストンロツドの速度が徐々に変化
するので、停止位置精度を高めることができる。
その具体例としては第４図に示すように、制動状
態において、電圧をパルス状に短時間宛印加す
る。これにより電歪素子１１は歪を電圧印加毎に
少しずつ生じ制動力を徐々に弱める。制動力が弱
まるにしたがい、ピストン２に加わる力により制
動抵抗に抗しながらピストンロツド３が動きはじ
め、しかも徐々に増速し、所定時間後、すなわち
所定回数のパルス的電圧印加の繰り返しの後に電
歪素子１１は全てが完全に歪んだ状態にり、制動
力を解除してピストンロツド３は定速度で移動す
る。停止する際も同様にしてパルス状に短時間宛
電圧を印可し、徐々に制動力を加え、ピストンロ
ツド３の速度を減速し、所定時間後に全制動状態
に達する。ピストンロツドは急激に停止されるの
でなく、慣性の影響を殆ど受けないので停止位置
は殆ど正確に定めた位置に保持される。 The voltage application device of a braking device directly applies a predetermined voltage to switch between the braking state and the braking release state, whereas if the braking is started and released gradually, the speed of the piston rod gradually increases. Therefore, the accuracy of the stop position can be improved.
As a specific example, as shown in FIG. 4, a voltage is applied in a pulsed manner for a short period of time in a braking state. As a result, the electrostrictive element 11 causes strain little by little each time a voltage is applied, gradually weakening the braking force. As the braking force weakens, the piston rod 3 begins to move against the braking resistance due to the force applied to the piston 2, and the speed gradually increases. All elements 11 are in a completely distorted state, the braking force is released, and the piston rod 3 moves at a constant speed. When stopping, a voltage is similarly applied in a pulsed manner for a short period of time, a braking force is gradually applied, the speed of the piston rod 3 is reduced, and a full braking state is reached after a predetermined period of time. Since the piston rod is not stopped abruptly and is hardly affected by inertia, the stopping position is maintained at an almost exactly defined position.
効 果
本発明によりリング状電歪素子を用いる簡単な
構造で小さな電圧で大きな緊張力を得ることがで
き、確実な制動効果が得られる。しかも各部部材
に無理な変形力を生じることなく安定した装置が
得られた。Effects According to the present invention, a large tension force can be obtained with a small voltage with a simple structure using a ring-shaped electrostrictive element, and a reliable braking effect can be obtained. Moreover, a stable device was obtained without causing any unreasonable deformation force to the various parts and members.
第１図は本発明に係るシリンダの断面図、第２
図は第１図の−断面図、第３図は第２図にお
けるピストンロツドとブレーキシユーの変形例を
示す図、第４図は電圧印可状態の一例を示す図で
ある。
３……ピストンロツド、９……制動装置、１０
……ブレーキシユー、１１……電歪素子、１２…
…電極、１３，１４……電線、１５……電圧印加
装置。
FIG. 1 is a sectional view of a cylinder according to the present invention, and FIG.
3 is a diagram showing a modification of the piston rod and brake shoe in FIG. 2, and FIG. 4 is a diagram showing an example of a voltage applied state. 3... Piston rod, 9... Braking device, 10
...Brake shoe, 11...Electrostrictive element, 12...
... Electrode, 13, 14 ... Electric wire, 15 ... Voltage application device.
Claims (1)
ダーにおて、制動装置がピストンロツドに嵌装さ
れ軸線方向に並置された複数個のリング状電歪素
子と、該電歪素子に接続された電圧印加装置によ
り形成されていることを特徴とする制動装置付シ
リンダー。 ２ 前記制動装置の電歪素子が電圧無印加時にピ
ストンロツドを緊締し制動するように寸法を設定
され、電圧印加による膨張によりピストンロツド
との間に間隙を生じ制動を解除することを特徴と
する特許請求の範囲第１項に記載の制動装置付シ
リンダー。[Scope of Claims] 1. In a cylinder with a braking device that brakes a piston rod, the braking device includes a plurality of ring-shaped electrostrictive elements fitted into the piston rod and arranged in parallel in the axial direction, and a plurality of ring-shaped electrostrictive elements connected to the electrostrictive elements. A cylinder with a braking device, characterized in that it is formed by a voltage applying device. 2. A patent claim characterized in that the electrostrictive element of the braking device is dimensioned so as to tighten and brake the piston rod when no voltage is applied, and when it expands when voltage is applied, it creates a gap between it and the piston rod and releases the braking. A cylinder with a braking device according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18190586A JPS6338704A (en) | 1986-08-04 | 1986-08-04 | Cylinder with brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18190586A JPS6338704A (en) | 1986-08-04 | 1986-08-04 | Cylinder with brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6338704A JPS6338704A (en) | 1988-02-19 |
| JPH0418167B2 true JPH0418167B2 (en) | 1992-03-27 |
Family
ID=16108938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18190586A Granted JPS6338704A (en) | 1986-08-04 | 1986-08-04 | Cylinder with brake |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6338704A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02110705U (en) * | 1989-02-23 | 1990-09-05 |
-
1986
- 1986-08-04 JP JP18190586A patent/JPS6338704A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6338704A (en) | 1988-02-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |