JPS6143651B2 - - Google Patents
Info
- Publication number
- JPS6143651B2 JPS6143651B2 JP10839381A JP10839381A JPS6143651B2 JP S6143651 B2 JPS6143651 B2 JP S6143651B2 JP 10839381 A JP10839381 A JP 10839381A JP 10839381 A JP10839381 A JP 10839381A JP S6143651 B2 JPS6143651 B2 JP S6143651B2
- Authority
- JP
- Japan
- Prior art keywords
- strain
- generating portion
- annular
- portions
- force
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Description
【発明の詳細な説明】
この発明は起歪部の概略の形状が環状であるロ
ードセルの改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a load cell in which the general shape of the strain-generating portion is annular.
従来のこの種のロードセルは、一般的には第１
図ａ，ｂに示すような構成となつている。同図に
おいて、１は環状起歪部、２ａ，２ｂは荷重伝達
部であり、支持部及び着力部が適当に設けられて
いる。環状起歪部１の内周面にはストレインゲー
ジC1，C2，T1，T2が貼着されている。そのゲー
ジC1，C2，T1，T2は第２図に示すようなフリブ
リツジ構成になつていて、着力部４に作用する荷
重に応じた出力電圧ｅを出力するようになつてい
る。このようなロードセルは、荷重が圧縮力Ｐと
して着力部４の中心に作用する場合は、ゲージ
C1，C2には圧縮力が、ゲージT1，T2には引張力
が働らく。このような構成において、ゲージ
T1，T2はゲージC1，C2に較べて80〜90％の出力
が出るものであるが、もし起歪部１に作用する圧
縮力Ｐが中心よりも外れた位置にP′としてかかる
とすると、環状起歪部１の荷重伝達部２ａ近傍の
応力分布が、第３図に実線で示す状態から点線で
示すような状態に大きく変るために、ゲージ
T1，T2の出力も変化する。ゲージC1，C2の出力
は上記荷重位置の移動によつて増減するが、増減
量が大略等しいので補正し合うことになる。しか
し、ゲージT1，T2の出力の変化は１桁以上大で
あり、合成値もうまく補正し合うことにはならな
い。従つてこの種の起歪部を有するロードセルは
着力点の位値の変化に対して出力の変化が多い欠
点があつた。この欠点を除くために、第４図に示
すような構成のものが提案されている。すなわ
ち、支持部３に一体的にケース５を設け、着力部
４と上下に長く形成してダイヤフラム６，７で保
持した構成である。これには構造が複雑な欠点が
ある。 Conventional load cells of this type generally have a first
The configuration is as shown in Figures a and b. In the figure, reference numeral 1 designates an annular strain-generating portion, 2a and 2b designate load transmitting portions, and support portions and force application portions are appropriately provided. Strain gauges C 1 , C 2 , T 1 , and T 2 are attached to the inner circumferential surface of the annular strain-generating portion 1 . The gauges C 1 , C 2 , T 1 , and T 2 have a fringe configuration as shown in FIG. 2, and are adapted to output an output voltage e corresponding to the load acting on the force applying portion 4. When a load acts on the center of the force application part 4 as a compressive force P, such a load cell is
Compressive force acts on C 1 and C 2 , and tensile force acts on gauges T 1 and T 2 . In such a configuration, the gauge
T 1 and T 2 output 80 to 90% of the output compared to gauges C 1 and C 2 , but if the compressive force P acting on the strain generating part 1 is located at a position off center, If this is the case, the stress distribution near the load transmitting part 2a of the annular strain-generating part 1 will change greatly from the state shown by the solid line in FIG. 3 to the state shown by the dotted line.
The outputs of T 1 and T 2 also change. The outputs of the gauges C 1 and C 2 increase or decrease due to the movement of the load position, but since the increases and decreases are approximately equal, they are corrected for each other. However, the changes in the outputs of the gauges T 1 and T 2 are greater than one order of magnitude, and the combined values do not correct each other well. Therefore, a load cell having this type of strain-generating portion has the disadvantage that the output changes frequently in response to a change in the position value of the force application point. In order to eliminate this drawback, a configuration as shown in FIG. 4 has been proposed. That is, the case 5 is provided integrally with the support part 3, and is formed long above and below the force applying part 4, and is held by diaphragms 6 and 7. This has the disadvantage of a complicated structure.
この発明は、比較的簡単な構造で、着力点の移
動が荷重検出精度に及ぼす影響が少ない環状起歪
部を有するロードセルを提供することを目的とす
る。 An object of the present invention is to provide a load cell having a relatively simple structure and having an annular strain-generating portion in which movement of a force application point has little effect on load detection accuracy.
以下この発明を図示の実施例に基いて説明す
る。第５図及び第６図は第１の実施例の圧縮型ロ
ードセルを示し、１は環状起歪部、C1，C2，
T1，T2はストレインゲージである。１０，１１
は着力部、１２ａ，１２ｂ，１３ａ，１３ｂは脚
状部である。 The present invention will be explained below based on the illustrated embodiments. FIG. 5 and FIG. 6 show the compression type load cell of the first embodiment, in which 1 is an annular strain part, C 1 , C 2 ,
T 1 and T 2 are strain gauges. 10,11
12a, 12b, 13a, 13b are leg-shaped parts.
環状起歪部１とストレインゲージC1，C2，
T1，T2は従来例として示した第１図のものと同
じである。また、ブリツジ回路も第２図と同じで
ある。 Annular strain generating part 1 and strain gauges C 1 , C 2 ,
T 1 and T 2 are the same as those shown in FIG. 1 as a conventional example. Further, the bridge circuit is also the same as that shown in FIG.
着力部１０，１１は、起歪部１の上部と下部と
に各々間隔を置いて、起歪部１の上下方向の中心
線１４上に位置するように設けられ、上端面２
０、下端２１が各々球面に形成されている。 The force applying parts 10 and 11 are provided at intervals at the upper and lower parts of the strain generating part 1, respectively, and are located on the center line 14 of the strain generating part 1 in the vertical direction.
0, the lower end 21 is each formed into a spherical surface.
脚状部１２ａ，１２ｂ，１３ａ，１３ｂは、着
力部１０，１１を起歪部１に一体に連結するよう
に設けられたものである。脚状部１２ａ，１２ｂ
は、第５図に見られるように平面両側に対称に、
つまり中心線１４に対称に各々の中心線間隔寸法
がｌとなるように設けられている。脚状部１３
ａ，１３ｂも同様に設けられている。この脚状部
１２ａ，１２ｂ及び１３ａ，１３ｂは着力部１
０，１１に圧縮力Ｐが作用したとき、その作用力
を各々の脚状部１２ａと１２ｂ及び１３ａと１３
ｂに分けて環状起歪部１へ伝達するものであり、
その際に起歪部１のストレインゲージT1，T2の
位置に引張力が作用するように上記寸法ｌが決め
られている。これは環状起歪部１の環状をなす中
立面の最大幅寸法ｍよりもｌがある程度小さいも
のであればよい。また、脚状部１２ａ，１２ｂを
設けたことによる窓状孔２２、脚状部１３ａ，１
３ｂを設けたことによる窓状孔２３の環状起歪部
１側の縁は円弧に形成されて、環状起歪部１とし
ては幅寸法ｂに相当する間が円周方向に同じ寸法
ｃとなつている。その幅寸法ｂはストレインゲー
ジT1，T2の幅寸法ａよりも十分に大きい寸法で
ある。なお、環状起歪部１の幅寸法ｂに相当する
部分は一様な断面形状であれば、円弧に限らず直
線状またはこれらに近い形状とすることができ
る。図中２４は保護カバーである。 The leg portions 12a, 12b, 13a, and 13b are provided to integrally connect the force application portions 10 and 11 to the strain generating portion 1. Leg-shaped parts 12a, 12b
are symmetrical on both sides of the plane as seen in Figure 5,
That is, they are provided symmetrically about the center line 14 so that the distance between each center line is l. Leg-shaped portion 13
a and 13b are similarly provided. These leg-shaped parts 12a, 12b and 13a, 13b are the force applying part 1.
When a compressive force P is applied to the legs 12a and 11, the acting force is applied to the legs 12a and 12b and 13a and 13.
It is divided into parts b and transmitted to the annular strain generating part 1,
The above-mentioned dimension 1 is determined so that a tensile force is applied to the strain gauges T 1 and T 2 of the strain generating portion 1 at that time. This may be as long as l is smaller than the maximum width m of the annular neutral surface of the annular strain-generating portion 1 to some extent. Moreover, the window-like hole 22 and the leg-like parts 13a, 1 due to the provision of the leg-like parts 12a, 12b.
3b, the edge of the window-like hole 23 on the side of the annular strain-generating portion 1 is formed into a circular arc, and as for the annular strain-generating portion 1, the distance corresponding to the width dimension b becomes the same dimension c in the circumferential direction. ing. The width dimension b is sufficiently larger than the width dimension a of the strain gauges T 1 and T 2 . Note that the portion corresponding to the width dimension b of the annular strain-generating portion 1 is not limited to a circular arc, but may be a straight line or a shape close to this as long as it has a uniform cross-sectional shape. In the figure, 24 is a protective cover.
このように構成されたロードセルの環状起歪部
１は、中心線１４に一致するような荷重Ｐが加わ
つたとき、脚状部１２ａ，１２ｂ間の少くとも幅
ｂに相当する間においては、第７図に実線で示す
ような一様な応力分布になる。この場合はもちろ
ん高精度で荷重検出が可能である。同じ大きさの
荷重Ｐが中心線１４から外れて着力点がP′で示す
ように移動したときには、第７図に点線で示すよ
うな応力分布になる。このことは着力点の移動に
よつて脚状部１２ａ，１２ｂを介して環状起歪部
１へ伝達される荷重の配分が変化することから容
易に理解されよう。この応力分布は、図において
左方が大きく、右方が小さい状態ではあるが、そ
の左方から右方への変化状態は直線的でありかつ
中心においては着力点が中心線１４に一致してい
る場合と同じ大きさである。すなわち、中心より
左方の増大分が右方における減少分に等しい状態
である。ゲージT1は環状起歪部１の中心に設け
られているので、ゲージT1の出力は着力点が移
動したことによる左方の増分と右方の減少分を同
時に検出したものとなり、荷重着力点が移動しな
い前の状態と同じである。このことはゲージT2
についても同じである。実験によると、このよう
に構成したロードセルは、第１図の従来のものと
比較して、同じ荷重着力点の移動に対して出力の
変化が1/5〜1/10に小さくなることが確認され
た。従つて、第１図の従来のロードセルの最大の
欠点が、単に荷重伝達部２ａ，２ｂを各２個の脚
状部１２ａ，１２ｂ及び１３ａ，１３ｂに変更す
るだけで大幅に改善される。また、第４図のもの
と比較しても２重のダイヤフラム６，７を設ける
必要がないので製作が要易である。 When a load P that coincides with the center line 14 is applied to the annular strain-generating portion 1 of the load cell configured in this way, the annular strain-generating portion 1 will be in a position corresponding to at least the width b between the leg portions 12a and 12b. This results in a uniform stress distribution as shown by the solid line in Figure 7. In this case, it is of course possible to detect the load with high accuracy. When a load P of the same magnitude deviates from the center line 14 and the point of application of force moves as shown by P', the stress distribution will be as shown by the dotted line in FIG. This can be easily understood from the fact that the distribution of the load transmitted to the annular strain-generating portion 1 via the leg portions 12a, 12b changes as the force application point moves. Although this stress distribution is large on the left side and small on the right side in the figure, the state of change from the left side to the right side is linear, and the point of application of force coincides with the center line 14 at the center. It is the same size as if it were there. In other words, the increase on the left side of the center is equal to the decrease on the right side. Since the gauge T 1 is installed at the center of the annular strain generating part 1, the output of the gauge T 1 is the one that simultaneously detects the increase on the left and the decrease on the right due to the movement of the force application point, and the output of the gauge T 1 is the one that detects the increase in the left side and the decrease in the right side due to the movement of the force application point, The point is the same as before without moving. This means that the gauge T 2
The same applies to According to experiments, it has been confirmed that the load cell configured in this way has a change in output that is 1/5 to 1/10 smaller when the same load application point moves compared to the conventional one shown in Figure 1. It was done. Therefore, the biggest drawback of the conventional load cell shown in FIG. 1 can be greatly improved by simply changing the load transmitting parts 2a, 2b to two leg parts 12a, 12b and 13a, 13b. Furthermore, compared to the one shown in FIG. 4, it is easier to manufacture since there is no need to provide double diaphragms 6 and 7.
上記実施例は圧縮型のロードセルであるが、こ
の発明は第８図及び第９図に示すように、引張型
のロードセルにも適用できる。同図において、第
５図及び第６図のものと同等部分は同一図面符号
で示してあり、３０，３１はつり環に形成された
荷重着力部である。この場合、力の作用方向が変
るため、ストレインゲージに作用する力も引張力
が圧縮力に、圧縮力が引張力に各々逆になる。 Although the above embodiment is a compression type load cell, the present invention can also be applied to a tension type load cell as shown in FIGS. 8 and 9. In the same figure, parts equivalent to those in FIGS. 5 and 6 are indicated by the same reference numerals, and 30 and 31 are load applying parts formed on the suspension ring. In this case, since the acting direction of the force changes, the tensile force becomes a compressive force, and the compressive force becomes a tensile force, respectively.
また、第５図及び第６図の実施例では、着力部
１０，１１の各々の端部を球面に形成したものを
示したが、場合によつては雄ねじ又は雌ねじを形
成して引張又は圧縮に利用できるようにしてもよ
い。 Further, in the embodiments shown in FIGS. 5 and 6, each end of the force application parts 10 and 11 is formed into a spherical surface, but in some cases, a male thread or a female thread may be formed to apply tension or compression. It may be made available for use.
なお、ストレインゲージとしては抵抗線歪計、
半導体歪計のいずれも使用できる。 In addition, as a strain gauge, a resistance wire strain meter,
Any semiconductor strain meter can be used.
さらに、上記実施例ではいずれも４ゲージ法と
して説明したが、８ゲージ法を適用してもよく、
その場合は中心線に対称にゲージを設ければよ
い。 Furthermore, in the above embodiments, the 4-gauge method was used, but the 8-gauge method may also be applied.
In that case, the gauges may be provided symmetrically to the center line.
以上のようにこの発明によれば、比較的簡単
で、高精度の荷重検出が可能で、安価なロードセ
ルを提供できる。 As described above, according to the present invention, it is possible to provide a relatively simple load cell that is capable of highly accurate load detection and is inexpensive.
第１図は従来の一般的な環状起歪部を有するロ
ードセルの主要部を示しａは正面図、ｂはａのＡ
−Ａ断面図、第２図は第１図のロードセルのブリ
ツジ回路図、第３図は第１図のロードセルの主要
部の応力状態説明図、第４図は従来の改良型ロー
ドセルの縦断面図、第５図はこの発明の実施例の
部分破断正面図、第６図は第５図の中央縦断面
図、第７図は同実施例の主要部の応力状態説明
図、第８図はこの発明の他の実施例の部分破断正
面図、第９図は第８図の中央縦断面図である。
１……環状起歪部、１０，１１……着力部、１
２ａ，１２ｂ，１３ａ，１４ａ……脚状部、１４
……中心線、T1，T2，C1，C2……ストレインゲ
ージ、２２，２３……窓状孔、２４……保護カバ
ー、３０，３１……荷重着力部（つり環）。
Figure 1 shows the main parts of a conventional general load cell having an annular strain-generating part, a is a front view, and b is an A of a.
-A sectional view, Fig. 2 is a bridge circuit diagram of the load cell shown in Fig. 1, Fig. 3 is an explanatory diagram of the stress state of the main part of the load cell shown in Fig. 1, and Fig. 4 is a longitudinal sectional view of the conventional improved load cell. , FIG. 5 is a partially cutaway front view of an embodiment of the present invention, FIG. 6 is a central vertical sectional view of FIG. FIG. 9 is a partially cutaway front view of another embodiment of the invention, and FIG. 9 is a longitudinal sectional view at the center of FIG. 1... Annular strain-generating part, 10, 11... Force application part, 1
2a, 12b, 13a, 14a... leg-shaped portion, 14
... Center line, T 1 , T 2 , C 1 , C 2 ... Strain gauge, 22, 23 ... Window hole, 24 ... Protective cover, 30, 31 ... Load application part (hanging ring).
Claims (1)
状を環状に形成され、その起歪部の上下に各々間
隔を置いて起歪部の上下方向の中心線上に各別に
上側及び下側着力部を設け、その両方の着力部と
上記起歪部との各々の間を一体に連結するように
上記中心線の両側に間隔を置いて位置する上下各
２個の荷重伝達用の脚状部を設け、上記起歪部の
内周面の上面及び下面並びに左面及び右面にスト
レインゲージを設けてなり、上記上下の各脚状部
の中心線間隔寸法が上記環状起歪部の環状中立面
の最大幅寸法よりも小さく形成され、かつ上記上
下で夫々に２個の脚状部と連結する間の環状起歪
部の大部分を一様な断面形状に形成してその一様
な断面形状部分の左右方向の幅寸法よりも上記上
面及び下面のストレインゲージの左右方向幅寸法
が小さく形成されているロードセル。1. A strain-generating portion has a predetermined thickness in the front-rear direction and is formed into an annular front shape, and upper and lower sides are separately placed on the vertical center line of the strain-generating portion at intervals above and below the strain-generating portion. A force-applying portion is provided, and two upper and lower leg-shaped legs for load transmission are positioned at intervals on both sides of the center line so as to integrally connect both of the force-applying portions and each of the strain-generating portions. and strain gauges are provided on the upper and lower surfaces as well as on the left and right surfaces of the inner circumferential surface of the strain-generating portion, and the distance between the center lines of each of the upper and lower leg-like portions is equal to the annular neutral of the annular strain-generating portion. Most of the annular strain-forming portions formed smaller than the maximum width dimension of the surface and connected to the two leg-like portions at the upper and lower sides are formed to have a uniform cross-sectional shape. A load cell, wherein the width of the strain gauges on the upper and lower surfaces in the left and right directions is smaller than the width in the left and right directions of the shaped portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10839381A JPS589033A (en) | 1981-07-10 | 1981-07-10 | Load cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10839381A JPS589033A (en) | 1981-07-10 | 1981-07-10 | Load cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS589033A JPS589033A (en) | 1983-01-19 |
| JPS6143651B2 true JPS6143651B2 (en) | 1986-09-29 |
Family
ID=14483619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10839381A Granted JPS589033A (en) | 1981-07-10 | 1981-07-10 | Load cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS589033A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6342436A (en) * | 1986-08-08 | 1988-02-23 | Takao Yoshida | Strain gauge type physical quantity-electric energy transducer |
| DE3730703A1 (en) * | 1987-09-12 | 1989-03-23 | Philips Patentverwaltung | Force transducer |
-
1981
- 1981-07-10 JP JP10839381A patent/JPS589033A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS589033A (en) | 1983-01-19 |
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| JP3208404B2 (en) | Weight measuring device | |
| JPH0676927B2 (en) | Auxiliary member for load measurement | |
| JPS62198561A (en) | Steering wheel |