JPH01163478A - Shape memory alloy device - Google Patents
Shape memory alloy deviceInfo
- Publication number
- JPH01163478A JPH01163478A JP32248387A JP32248387A JPH01163478A JP H01163478 A JPH01163478 A JP H01163478A JP 32248387 A JP32248387 A JP 32248387A JP 32248387 A JP32248387 A JP 32248387A JP H01163478 A JPH01163478 A JP H01163478A
- Authority
- JP
- Japan
- Prior art keywords
- shape memory
- memory alloy
- spring
- buckling spring
- buckling
- 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.)
- Granted
Links
- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 52
- 230000000694 effects Effects 0.000 description 3
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/323—Thermally-sensitive members making use of shape memory materials
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、形状記憶合金が示す形状記憶効果を利用して
動作する形状記憶合金装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shape memory alloy device that operates by utilizing the shape memory effect exhibited by a shape memory alloy.
従来のこの種の形状記憶合金装置においては、形状記憶
合金を過負荷から保護する手段が設けられていなかった
。In conventional shape memory alloy devices of this type, no means were provided to protect the shape memory alloy from overload.
このため、過負荷により形状記憶合金が塑性変形し、形
状記憶合金が記憶形状に戻らなくなることがあるという
問題点があった。Therefore, there is a problem in that the shape memory alloy is plastically deformed due to overload, and the shape memory alloy may not return to its memorized shape.
本発明は、前記従来の問題点を解決するためになされた
もので、形状記憶合金を過負荷から保護することができ
る形状記憶合金装置を提供することを目的とする。The present invention was made in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide a shape memory alloy device that can protect the shape memory alloy from overload.
本発明による形状記憶合金装置は、
座屈ばねと、この座屈ばねに支持された状態で負荷を掛
けられる形状記憶合金とを有してなり、前記座屈ばねは
前記形状記憶合金から所定以上の大きさの力を作用され
ると、急激に大きく変形するように配設されているもの
である。The shape memory alloy device according to the present invention includes a buckling spring and a shape memory alloy to which a load is applied while being supported by the buckling spring, and the buckling spring is made of the shape memory alloy by a predetermined amount or more. It is arranged so that it will suddenly undergo a large deformation when a force of magnitude is applied to it.
本発明においては、形状記憶合金に過負荷が掛ろうとす
ると、所定以上の大きさの力が形状記憶合金から座屈ば
ねに作用し、座屈ばねが座屈して急激に大きく変形し、
形状記憶合金を負荷から解放する。In the present invention, when an overload is applied to the shape memory alloy, a force larger than a predetermined value acts on the buckling spring from the shape memory alloy, causing the buckling spring to buckle and rapidly deform to a large extent.
Release the shape memory alloy from the load.
以下、本発明を図面に示す実施例に基づいて説明する。 Hereinafter, the present invention will be explained based on embodiments shown in the drawings.
第１図から４図までは本発明の一実施例を示す。1 to 4 show an embodiment of the present invention.
この実施例において、位置を固定されたばね支持材１の
一方の面には、座屈ばね２の一端側が取り付けられてい
る。この座屈ばね２は、自由な状態において横断面円弧
状で直線状に延びる薄い帯状の鋼板からなる。この座屈
ばね２の他端部付近には、第一の接点３が固定されてい
る。ばね支持材１の他方の面には、金属製の板ばね４の
一端側が取り付けられている。この板ばね４の他端部に
は、第二の接点５が固定されている。そして、前記第一
および第二の接点４，５は、座屈ばね２および板ばね４
の弾性により互いに接触される方向に付勢されている。In this embodiment, one end side of a buckling spring 2 is attached to one surface of a spring support member 1 whose position is fixed. This buckling spring 2 is made of a thin strip-shaped steel plate that has an arcuate cross section and extends linearly in a free state. A first contact 3 is fixed near the other end of the buckling spring 2. One end of a metal leaf spring 4 is attached to the other surface of the spring support member 1 . A second contact 5 is fixed to the other end of the leaf spring 4. The first and second contacts 4 and 5 are connected to the buckling spring 2 and the leaf spring 4.
are urged in the direction of contacting each other due to their elasticity.
位置を固定された回動部材支持材６には、回動部材７が
回動可能に支持されている。この回動部材７にはＴｉ−
Ｎｉ合金からなる線材状（ワイヤ状）の形状記憶合金８
の一端部が固定されており、回動部材７を介して形状記
憶合金８に負荷が掛るようになっている。前記形状記憶
合金８の他端部は座屈ばね２の接点３側の端部に固定さ
れている。A rotating member 7 is rotatably supported by the rotating member supporting member 6 whose position is fixed. This rotating member 7 has Ti-
Wire-shaped shape memory alloy made of Ni alloy 8
One end of the shape memory alloy 8 is fixed, and a load is applied to the shape memory alloy 8 via the rotating member 7. The other end of the shape memory alloy 8 is fixed to the end of the buckling spring 2 on the contact 3 side.
また、前記回動部材７は、引張りばねからなるバイアス
ばね９により形状記憶合金８が引張りを受ける方向（第
１図、３図および４図において時計方向）に付勢されて
いる。Further, the rotating member 7 is biased in a direction in which the shape memory alloy 8 is subjected to tension (clockwise in FIGS. 1, 3, and 4) by a bias spring 9 made of a tension spring.
前記板ばね４は電源１０の一方の極に電気的に接続され
ており、電源１０の他方の極はスイッチ１１を介して形
状記憶合金８の回動部材７側の端部に電気的に接続され
ている。なお、前記電源１０は、図面では直流電源とし
て示されているが、交流電源やパルス電源であってもよ
い。The leaf spring 4 is electrically connected to one pole of a power source 10, and the other pole of the power source 10 is electrically connected to the end of the shape memory alloy 8 on the rotating member 7 side via a switch 11. has been done. Although the power source 10 is shown as a DC power source in the drawings, it may be an AC power source or a pulse power source.
次に、本実施例の動作を説明する。Next, the operation of this embodiment will be explained.
第１図のようにスイッチ１１が開放されており、形状記
憶合金が周囲温度（室温）となっている場合には、形状
記憶合金８はバイアスばね９のばね力により、記憶して
いる長さから伸び変形を受けた状態となってい、る。When the switch 11 is open and the shape memory alloy is at ambient temperature (room temperature) as shown in FIG. It is in a state of being stretched and deformed.
また、通常状態においては、第３図のようにスイッチ１
１が閉成されると、電源１０からスイッチ１１、形状記
憶合金８、座屈ばね２、第一の接点３、第二の接点５、
板ばね４、電源１０の経路で電流が流れ、形状記憶合金
８がジュール熱により加熱されると、形状記憶合金８は
収縮して記憶している長さに戻ろうとする形状回復力を
発生し、回動部材９を第３図のように反時計方向に回動
させる（なお、第３図および４図の矢印りは回動部材を
介して形状記憶合金８に掛る負荷を示す）。In addition, in the normal state, switch 1 is
1 is closed, the power source 10 supplies the switch 11, the shape memory alloy 8, the buckling spring 2, the first contact 3, the second contact 5,
When a current flows in the path between the leaf spring 4 and the power source 10 and the shape memory alloy 8 is heated by Joule heat, the shape memory alloy 8 contracts and generates a shape recovery force that tries to return to the memorized length. The rotating member 9 is rotated counterclockwise as shown in FIG. 3 (note that the arrows in FIGS. 3 and 4 indicate the load applied to the shape memory alloy 8 via the rotating member).
しかし、負荷が所定以上になり、形状記憶合金８から座
屈ばね２に所定以上の力が作用すると、座屈ばね２は第
４図のように座屈して急激に大きく変形し、形状記憶合
金８を緩め、形状記憶合金８を負荷から解放する。また
、上述のように座屈ばね２が座屈すると、第一の接点と
第二の接点とが離れ、形状記憶合金８に対する通電は停
止される。However, when the load exceeds a predetermined value and a force exceeding a predetermined value is applied from the shape memory alloy 8 to the buckling spring 2, the buckling spring 2 buckles as shown in FIG. 8 to release the shape memory alloy 8 from the load. Furthermore, when the buckling spring 2 buckles as described above, the first contact and the second contact are separated, and the current supply to the shape memory alloy 8 is stopped.
なお、本実施例では、形状記憶合金８が一定以上に加熱
されたときにも、座屈ばね２が座屈するように座屈ばね
２の座屈力を設定しておけば、形状記憶合金８が一定以
上に加熱されたとき、第一の接点と第二の接点とが離れ
、形状記憶合金８に対する通電が停止されるので、形状
記憶合金８が過熱されるのを防止することもできる。In this embodiment, if the buckling force of the buckling spring 2 is set so that the buckling spring 2 buckles even when the shape memory alloy 8 is heated above a certain level, the shape memory alloy 8 When the shape memory alloy 8 is heated to a certain level or more, the first contact and the second contact are separated and the current supply to the shape memory alloy 8 is stopped, so that the shape memory alloy 8 can be prevented from being overheated.
また、前記実施例では、形状記憶合金８が座屈ばね２を
、該座屈ばね２の横断面の凸側（第２図において右方）
に引張るようになっているが、形状記憶合金８が座屈ば
ね２を、該座屈ばね２の横断面の凹側Ｃｍ２図において
左方）に引張ることとなるように装置を構成してもよい
。Further, in the above embodiment, the shape memory alloy 8 holds the buckling spring 2 on the convex side of the cross section of the buckling spring 2 (the right side in FIG. 2).
However, even if the device is configured so that the shape memory alloy 8 pulls the buckling spring 2 toward the concave side of the cross section of the buckling spring 2 (leftward in the figure Cm2), good.
また、本発明においては、実施例に示した形状以外の形
状の座屈ばねを用いてもよい。Further, in the present invention, buckling springs having shapes other than those shown in the embodiments may be used.
さらに、前記実施例ではバイアスばねを用いているが、
本発明においては、装置の構成によっては、バイアスば
ねは必ずしも必要ではない。Furthermore, although a bias spring is used in the above embodiment,
In the present invention, a bias spring is not necessarily required depending on the configuration of the device.
以上のように、本発明による形状記憶合金装置は、形状
記憶合金を過負荷から保護することができるという優れ
た効果を得られるものである。As described above, the shape memory alloy device according to the present invention has the excellent effect of being able to protect the shape memory alloy from overload.
第１図は本発明による形状記憶合金装置の一実施例を示
す側面図、第２図は第１図の■−■線方向矢視図、第３
図は前記実施例において形状記憶合金が形状回復してい
る状態を示す側面図、第４図は前記実施例において座屈
ばね２が座屈した状態を示す側面図である。
２・・・座屈ばね、３・・・第一の接点、５・・・第二
の接点、８・・・形状記憶合金。FIG. 1 is a side view showing one embodiment of the shape memory alloy device according to the present invention, FIG. 2 is a view taken along the line ■-■ in FIG.
The figure is a side view showing a state in which the shape memory alloy has recovered its shape in the above embodiment, and FIG. 4 is a side view showing a state in which the buckling spring 2 is buckled in the above embodiment. 2... Buckling spring, 3... First contact, 5... Second contact, 8... Shape memory alloy.
Claims (1)
けられる形状記憶合金とを有してなり、前記座屈ばねは
前記形状記憶合金から所定以上の大きさの力を作用され
ると、急激に大きく変形するように配設されていること
を特徴とする形状記憶合金装置。It has a buckling spring and a shape memory alloy to which a load is applied while being supported by the buckling spring, and the buckling spring is subjected to a force of a predetermined magnitude or more from the shape memory alloy. A shape memory alloy device characterized in that it is arranged so as to be rapidly and greatly deformed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322483A JP2632333B2 (en) | 1987-12-19 | 1987-12-19 | Shape memory alloy device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322483A JP2632333B2 (en) | 1987-12-19 | 1987-12-19 | Shape memory alloy device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01163478A true JPH01163478A (en) | 1989-06-27 |
| JP2632333B2 JP2632333B2 (en) | 1997-07-23 |
Family
ID=18144137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62322483A Expired - Fee Related JP2632333B2 (en) | 1987-12-19 | 1987-12-19 | Shape memory alloy device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2632333B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03168367A (en) * | 1989-11-28 | 1991-07-22 | Toki Corp Kk | Linear motion type actuator |
| WO2009137767A3 (en) * | 2008-05-08 | 2010-03-04 | Gm Global Technology Operations, Inc. | Overheating protection for shape memory alloy actuators |
| JP2011072704A (en) * | 2009-10-01 | 2011-04-14 | Hochiki Corp | Gas-liquid mixing equipment and fire extinguishing control method for the same |
| DE102012223596B4 (en) | 2011-12-22 | 2022-03-24 | GM Global Technology Operations, LLC (n.d. Ges. d. Staates Delaware) | SYSTEM FOR SELECTIVE ACTIVATION OF A SAFETY MECHANISM FOR PROTECTION AGAINST ELECTRIC SHOCK AND METHOD OF OPERATING SUCH SYSTEM |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5340709A (en) * | 1976-09-25 | 1978-04-13 | Ube Ind Ltd | Preparation of dicarboxylic acid diesters |
| JPS57121777U (en) * | 1981-01-26 | 1982-07-29 |
-
1987
- 1987-12-19 JP JP62322483A patent/JP2632333B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5340709A (en) * | 1976-09-25 | 1978-04-13 | Ube Ind Ltd | Preparation of dicarboxylic acid diesters |
| JPS57121777U (en) * | 1981-01-26 | 1982-07-29 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03168367A (en) * | 1989-11-28 | 1991-07-22 | Toki Corp Kk | Linear motion type actuator |
| WO2009137767A3 (en) * | 2008-05-08 | 2010-03-04 | Gm Global Technology Operations, Inc. | Overheating protection for shape memory alloy actuators |
| US8109087B2 (en) | 2008-05-08 | 2012-02-07 | GM Global Technology Operations LLC | Overheating protection for shape memory alloy actuators |
| JP2011072704A (en) * | 2009-10-01 | 2011-04-14 | Hochiki Corp | Gas-liquid mixing equipment and fire extinguishing control method for the same |
| DE102012223596B4 (en) | 2011-12-22 | 2022-03-24 | GM Global Technology Operations, LLC (n.d. Ges. d. Staates Delaware) | SYSTEM FOR SELECTIVE ACTIVATION OF A SAFETY MECHANISM FOR PROTECTION AGAINST ELECTRIC SHOCK AND METHOD OF OPERATING SUCH SYSTEM |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2632333B2 (en) | 1997-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |