JPS6052369B2 - Screw axial force measuring device - Google Patents
Screw axial force measuring deviceInfo
- Publication number
- JPS6052369B2 JPS6052369B2 JP2012079A JP2012079A JPS6052369B2 JP S6052369 B2 JPS6052369 B2 JP S6052369B2 JP 2012079 A JP2012079 A JP 2012079A JP 2012079 A JP2012079 A JP 2012079A JP S6052369 B2 JPS6052369 B2 JP S6052369B2
- Authority
- JP
- Japan
- Prior art keywords
- washer
- axial force
- measuring device
- screw
- force measuring
- 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
Landscapes
- Force Measurement Appropriate To Specific Purposes (AREA)
- Bolts, Nuts, And Washers (AREA)
Description
【発明の詳細な説明】
ねじ締結は本質的にねじのゆるみを避けることはできな
いから、ねじの製造並びに使用に際してねじのゆるみを
考慮することは大変重要である。DETAILED DESCRIPTION OF THE INVENTION Since loosening of the screw cannot be essentially avoided in screw fastening, it is very important to consider the loosening of the screw when manufacturing and using the screw.
現在、種々のゆるみ止め機構を備えたねじ類が多数市販
されているが、そのゆるみ止め効果を充分に認識しない
まま使用し、ねじのゆるみに気が付かないで事故が発生
している事態力化ばしば見受けられる。したがつて、ね
じ締結においてはたとえゆるみ止め対策が施してあつて
もその締結軸力を正確に把握しておく必要がある。とこ
ろで、ねじの軸力測定装置として、加圧座金の外周面に
歪ゲージを付着し、該座金に作用するねじの締結軸力を
座金の圧縮歪みに変換して測定するようにしたものは知
られている。Currently, there are many screws with various locking mechanisms on the market, but if they are used without fully understanding their locking effect, accidents may occur without realizing that the screws are loosening. It is often seen. Therefore, when tightening screws, even if measures are taken to prevent loosening, it is necessary to accurately grasp the tightening axial force. By the way, there is no known device for measuring the axial force of a screw in which a strain gauge is attached to the outer peripheral surface of a pressure washer, and the tightening axial force of the screw acting on the washer is converted into compressive strain of the washer. It is being
(米国特許第3461715号明細書参照)。しかし、
上記米国特許に係る軸力測定装置は、加圧座金の外周面
に箔状の歪ゲージをねじ軸線と平行に1本ないし数本を
配設した構成であつたため、前記加圧座金自体の厚みを
相当厚くする必要があるばかりでなく、各歪ゲージ間の
電気的接続が煩雑で、しかも、ねじ締結時における前記
加圧座金の曲りや局部的な陥没を防ぐため、その上下に
平座金を組み合わせて使用しなければならず、測定装置
全体が非常に大きく、実験室的には使用可能であるとし
ても、到底実際の使用に供し得ないという問題があつた
。(See US Pat. No. 3,461,715). but,
The axial force measuring device according to the above US patent has a configuration in which one or several foil-shaped strain gauges are arranged on the outer peripheral surface of the pressure washer parallel to the screw axis, so that the thickness of the pressure washer itself Not only is it necessary to make the pressure washers considerably thicker, but the electrical connections between each strain gauge are complicated.Furthermore, flat washers must be placed above and below the pressure washers to prevent them from bending or locally sinking when tightening the screws. They have to be used in combination, and the entire measuring device is very large, so even if it can be used in a laboratory, it is impossible to put it to practical use.
本発明の目的は、上記のような問題点を解決して、通常
の座金と同様に単独に使用できる簡単な装置でありなが
ら、ねじの軸力が容易かつ随時に測定できるねじの軸力
測定装置を提供することにある。The purpose of the present invention is to solve the above-mentioned problems and to provide a screw axial force measurement method that is a simple device that can be used alone in the same way as a normal washer, and that can easily and at any time measure the axial force of a screw. The goal is to provide equipment.
上記目的を達成するために本発明装置は、皿ばね状の座
金の外周縁に沿つてリード線状の歪ゲージを鉢巻状に付
着し、その両端引出線を外部へ導出させ、ねじ締結時に
おける軸力を前記座金の外、周縁の円周方向への伸びに
変換して測定するように構成したことを特徴とする。In order to achieve the above object, the device of the present invention attaches a strain gauge in the form of a lead wire in a headband shape along the outer periphery of a washer in the shape of a disc spring, and leads out the lead wires at both ends to the outside. The present invention is characterized in that the axial force is converted into an elongation in the circumferential direction of the outer periphery of the washer and measured.
以下本発明の一実施例を図面に基づいて説明する。An embodiment of the present invention will be described below based on the drawings.
1は皿ばね状の座金であつて、比較的弾性度の高いばね
鋼で製作され、その外周縁にはU字形;断面の環状溝2
が設けられている。1 is a washer in the shape of a disc spring, made of spring steel with relatively high elasticity, and has a U-shaped cross-sectional annular groove 2 on its outer periphery.
is provided.
座金1の内周部上側にはこの座金1と組み合わせて使用
するボルト又はナットの締結軸力が座金1全周にできる
だけ均等に作用するよう扁平面3を設けることが望まし
い。4はリード線状の歪ゲージであつて、座金1の環状
溝2に合成ゴムその他の電気絶縁性固定剤6を介して嵌
め込んで座金1の外周縁に鉢巻状に付着すると共に、両
端の引出線5を外部へ導出させてある。It is desirable to provide a flat surface 3 on the upper inner circumference of the washer 1 so that the tightening axial force of a bolt or nut used in combination with the washer 1 acts as evenly as possible over the entire circumference of the washer 1. Reference numeral 4 denotes a strain gauge in the form of a lead wire, which is fitted into the annular groove 2 of the washer 1 via a synthetic rubber or other electrically insulating fixing agent 6 and attached to the outer periphery of the washer 1 in a headband shape. A leader line 5 is led out to the outside.
7は補助座金で、座金1が軸方向の荷重を受けたとき、
半径方向外方への変位ができるだけ均一かつ円滑に行な
われるようにするため設けられるものであつて、座金1
の裏側が摺接する円錐斜面8を有し、焼入処理を施して
座金1より硬度を高くしてある。7 is an auxiliary washer, and when washer 1 receives a load in the axial direction,
The washer 1 is provided to ensure that the outward displacement in the radial direction is as uniform and smooth as possible.
It has a conical slope 8 on which the back side of the washer 1 slides, and is hardened to have higher hardness than the washer 1.
上記構成の本発明座金は、例えば第4図に示すように普
通の座金と同様ポルト10の首下へ嵌め込んでねじ締結
に使用する。The washer of the present invention having the above structure is used for screw fastening by being fitted under the neck of the port 10 in the same way as a normal washer, as shown in FIG. 4, for example.
而して、ねじ締結時に座金1が締結軸力のため半径方向
外方へ変位すると、座金1の外周が弾性的に伸びしたが
つて歪ゲージ4もこれに伴つて伸びる。When the washer 1 is displaced radially outward due to the axial tightening force during screw tightening, the outer periphery of the washer 1 elastically stretches, and the strain gauge 4 also stretches accordingly.
この歪ゲージ4の伸びは締結軸力に比例するから、第5
図に例示するように引出線5を測定器11に接続して歪
ゲージ4の伸びに起因する電気抵抗の変化を測定するこ
とにより締結軸力の変化が容易に検出できる。また、予
め歪ゲージの伸びと締結軸力との比例関係を数値的に設
定しておけば、軸力の大きさも直ちに測定することも可
能である。以上説明したように、本発明の測定装置は、
皿ばね状の座金の外周縁に沿つてリード線状の歪ゲージ
を鉢巻状に付着し、前記座金に作用するねじの締結軸力
を座金の外周縁の円周方向への伸ひに変換して測定する
ようにしたから、座金自体は比較的薄くでき、しかも普
通の座金と同様に単独で使用でき、使用取扱い上大変有
利てある。Since the elongation of this strain gauge 4 is proportional to the fastening axial force, the fifth
As illustrated in the figure, a change in the fastening axial force can be easily detected by connecting the leader wire 5 to a measuring device 11 and measuring the change in electrical resistance caused by the elongation of the strain gauge 4. Further, if the proportional relationship between the elongation of the strain gauge and the fastening axial force is set numerically in advance, it is also possible to immediately measure the magnitude of the axial force. As explained above, the measuring device of the present invention
A strain gauge in the form of a lead wire is attached in a headband shape along the outer periphery of a washer shaped like a disc spring, and the tightening axial force of the screw acting on the washer is converted into expansion of the outer periphery of the washer in the circumferential direction. Since the washer itself can be made relatively thin and can be used alone like a normal washer, it is very advantageous in terms of use and handling.
また、歪ゲージを用いた従来のこの種測定装置に比べて
、構成が簡単て製作も容易であり、量産して安価に提供
できる効果がある。なお、上記実施例のように補助座金
7を組み合わせて使用すると、大きな軸力も正確に測定
することが可能である。In addition, compared to conventional measuring devices of this type using strain gauges, the structure is simple and easy to manufacture, and it has the advantage that it can be mass-produced and provided at low cost. Note that if the auxiliary washer 7 is used in combination as in the above embodiment, even large axial forces can be accurately measured.
第1図は本発明に係る軸力検出装置付座金の平面図、第
2図は同中央縦断正面図、第3図は同要部の拡大断面図
、第4図は同使用状態を示す正面図、第5図は同軸力計
測状態を示す平面図である。
1・・・・・・座金、2・・・・・・環状溝、3・・・
・・・扁平面、4・・・・・・歪ゲージ、5・・・・・
・引出線、6・・・・・・固定剤、7・・・・・・補助
座金、8・・・・・・円錐斜面。Fig. 1 is a plan view of a washer with an axial force detection device according to the present invention, Fig. 2 is a front view of the center longitudinal section, Fig. 3 is an enlarged sectional view of the main parts, and Fig. 4 is a front view showing the same usage state. FIG. 5 is a plan view showing a coaxial force measurement state. 1... Washer, 2... Annular groove, 3...
... Flat surface, 4 ... Strain gauge, 5 ...
・Leader line, 6... Fixing agent, 7... Auxiliary washer, 8... Conical slope.
Claims (1)
ゲージ4を鉢巻状に付着し、その両端引出線5,5を外
部へ導出させ、ねじ締結時における軸力を前記座金1の
外周縁の円周方向への伸びに変換して測定するようにし
たことを特徴とするねじの軸力測定装置。 2 前記座金1の裏側の円錐斜面に摺接する円錐斜面8
を具備した補助座金7を前記座金1に組み合わせたこと
を特徴とする特許請求の範囲第1項記載のねじの軸力測
定装置。[Claims] 1. A strain gauge 4 in the form of a lead wire is attached in a headband shape along the outer periphery of the washer 1 in the shape of a disc spring, and the lead wires 5, 5 at both ends thereof are led out to the outside, so that it A screw axial force measuring device characterized in that the axial force is measured by converting the axial force into an elongation in the circumferential direction of the outer peripheral edge of the washer 1. 2 A conical slope 8 that slides into contact with the conical slope on the back side of the washer 1
The screw axial force measuring device according to claim 1, characterized in that an auxiliary washer 7 having the following is combined with the washer 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012079A JPS6052369B2 (en) | 1979-02-22 | 1979-02-22 | Screw axial force measuring device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012079A JPS6052369B2 (en) | 1979-02-22 | 1979-02-22 | Screw axial force measuring device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55112540A JPS55112540A (en) | 1980-08-30 |
JPS6052369B2 true JPS6052369B2 (en) | 1985-11-19 |
Family
ID=12018253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2012079A Expired JPS6052369B2 (en) | 1979-02-22 | 1979-02-22 | Screw axial force measuring device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6052369B2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPM617094A0 (en) * | 1994-06-09 | 1994-07-07 | Industrial Rollformers Pty Limited | Washer and support member for supporting a load |
JP2014105843A (en) * | 2012-11-29 | 2014-06-09 | Mitsubishi Electric Corp | Washer |
JP6324405B2 (en) * | 2013-11-22 | 2018-05-16 | 株式会社サンノハシ | Bolt, nut and strain measurement system |
US9719900B1 (en) | 2016-04-26 | 2017-08-01 | Northrop Grumman Systems Corporation | Strain-gauged washer for measuring bolt preload |
DE102017102868A1 (en) * | 2016-08-01 | 2018-02-01 | Fischerwerke Gmbh & Co. Kg | Fastener and method for detecting displacement of a fastener |
-
1979
- 1979-02-22 JP JP2012079A patent/JPS6052369B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS55112540A (en) | 1980-08-30 |
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