JP2006300908A - Force transducer - Google Patents
Force transducer Download PDFInfo
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- JP2006300908A JP2006300908A JP2005144660A JP2005144660A JP2006300908A JP 2006300908 A JP2006300908 A JP 2006300908A JP 2005144660 A JP2005144660 A JP 2005144660A JP 2005144660 A JP2005144660 A JP 2005144660A JP 2006300908 A JP2006300908 A JP 2006300908A
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Description
本発明は、電気的に検出する力変換器に係り、小型高精度の力変換器に関する。 The present invention relates to a force transducer for electrical detection, and relates to a small and highly accurate force transducer.
(従来の技術)
外周部と中央部を放射状の梁で連結され、その放射状に配置された梁に側面から穴をあけ、起歪部とし、周縁部を固定し、中央部に力を加え、電気抵抗検出手段ひずみゲージを用いる力変換器が知られている。(Conventional technology)
The outer periphery and the center are connected by a radial beam, and a hole is drilled from the side of the radially arranged beam to form a strain generating part, the peripheral part is fixed, a force is applied to the central part, and the electrical resistance detection means strain Force transducers using gauges are known.
従来の力変換器例図3において、力変換器本体11の中央12には荷重を受ける加重印加部13が設けられ、加重印加部13と周縁部14との間は3個の梁21〜23を介して接続されている。各梁21〜23は横方向に穿設された円形穴を各梁に有し、貫通孔24〜26を通して深い位置に梁があり、24穴を貫通して梁21に円形穴があけられ、同様に各当該梁に円形穴があけられ、該円形穴の上下方向の厚さを薄くされた起歪部の上面及び下面に電気抵抗検出手段ひずみゲージが接着等で設けられている。 In FIG. 3, a
このような構成において加重印加部に力(F)が負荷されると、力(F)に比例した応力で当該各梁にあけられた円穴の周囲にひずみを生じ、このひずみを電気抵抗検出手段ひずみゲージで測定することで、力(F)の大きさを測定することができる。 In such a configuration, when a force (F) is applied to the load application unit, a strain is generated around the circular hole formed in each beam with a stress proportional to the force (F), and this strain is detected by electric resistance. By measuring with a means strain gauge, the magnitude of the force (F) can be measured.
しかし、特に小型の力変換器では、穴の周囲のひずみは、力の大きさで起こる変形によって最大応力点が移動したり、要求位置間隔が小さすぎる等の制約があり、最大応力点にひずみゲージを設けられない問題があった。 However, especially in a small force transducer, the strain around the hole is limited by the deformation caused by the magnitude of the force and the maximum stress point moves or the required position interval is too small. There was a problem that the gauge could not be provided.
さらに、穴の上下のひずみゲージ設けられていない最弱部の位置には、最大剪断応力が働くため、ひずみ検出部以外で弾性域を逸脱してしまうため負荷される力(F)に制限を受け、起歪部での弾性限界より小さい力(F)を上限にされ、ひずみゲージからの値をも制限されるため、ダイナミックレンジが小さく制限されることで高精度を保てない問題があった。この最弱部は力(F)により変形し、最大応力点を移動させてしまうため直線性誤差の原因にもなっていた。 Furthermore, since the maximum shear stress works at the position of the weakest part where the strain gauge is not provided above and below the hole, the force (F) to be applied is limited because it deviates from the elastic region other than the strain detection part. However, since the force (F) smaller than the elastic limit at the strain generating portion is set as the upper limit and the value from the strain gauge is also limited, there is a problem that high accuracy cannot be maintained by limiting the dynamic range to be small. It was. The weakest part is deformed by force (F), and the maximum stress point is moved, which causes a linearity error.
梁の起歪部の加工に関して、周縁部の穴を貫通して内部の深い位置にある梁に起歪部となる加工するため、起歪部として必要な形状の加工や寸法精度を保つことが困難であり、起歪部として機能を十分に果たせない問題があった。 With regard to the processing of the strained portion of the beam, the processing of the shape required as the strained portion and the dimensional accuracy can be maintained because the strained portion is processed into the beam in the deep position inside through the hole at the periphery. There is a problem that it is difficult and cannot sufficiently function as a strain generating portion.
また、深い位置にある梁に、かろうじて加工できる円形の横穴により上下の厚さが薄くなった最弱部の位置には最大剪断応力が発生するためダイナミックレンジの制約、ひずみゲージ要求位置間隔が小さすぎるため、最大応力点にひずみゲージを設けられない制約や丸穴の形状で発生する変位による最大応点の移動などの原因により、直線性誤差、ステリシス誤差や再現性誤差、を引き起こしたり、出力を小さく抑えなければならないなどの問題があった。 In addition, since the maximum shear stress is generated at the weakest position where the thickness of the top and bottom is thin due to a circular side hole that can be barely machined in a deep beam, the dynamic range is limited and the strain gauge required position interval is small. Therefore, the linear stress error, the steric error, the reproducibility error, etc. are caused by the restriction that the strain gauge cannot be provided at the maximum stress point and the movement of the maximum stress point due to the displacement generated in the shape of the round hole. There were problems such as having to keep it small.
上記の問題点を解決するために、中心部から周縁部へほぼ等配放射状の複数の梁で結合されている梁の郡が、軸方向に適宜離間して複数あり、当該梁の郡の位相を異にすることで、開口部が加重方向となるため、各々の梁にある起歪部の形状の自由度ができ、複数の起歪部をひとつに梁に設けることが可能になる。 In order to solve the above-mentioned problem, there are a plurality of groups of beams connected by a plurality of substantially equal radial beams from the central portion to the peripheral portion, which are appropriately separated in the axial direction, and the phase of the group of the beams Since the opening is in the load direction, the degree of freedom of the shape of the strain-generating portion in each beam can be increased, and a plurality of strain-generating portions can be provided in one beam.
各梁における複数の起歪部は力(F)における各梁の中で最大歪を発生するような形状とし、電気抵抗歪検出手段ひずみゲージを最大歪を発生部へ配置することでダイナミックレンジを最大とし、最大応力点の移動を回避しようとするものである。 A plurality of strain generating portions in each beam are shaped so as to generate the maximum strain in each beam in force (F), and a dynamic range is provided by arranging an electric resistance strain detecting means strain gauge on the generating portion. The maximum is to avoid the movement of the maximum stress point.
以下、図1により本実施例を説明する。11は本実施例の上面図であり、下にその断面図が示されている。中心部12から周縁部14へ梁31から33の梁の郡と軸方向へ適宜距離Lを離間した位置に梁34から36の梁の郡があり、各々の梁の郡の位相は60度ずれて配置されている。Hereinafter, this embodiment will be described with reference to FIG. 11 is a top view of the present embodiment, and a cross-sectional view thereof is shown below. There are a group of
このため、梁31の起歪部31a,31bの加工は図中下方からエンドミル加工を行うことができ、梁34については、図中上方からからエンドミル加工を行うことができ、従来ような奥まった部分の加工はなく、広い開口部から剛性の大きな工具で理想の起歪部の形を加工できる。31a、31bのような2ヶ所の半円形起歪部を設けることにより、たわみによって最大応力点の移動も阻止できる。 Therefore, the processing of the
梁の1つについて説明する。梁31にはその梁の最弱部を起歪部31aと31bとにして、ひずみゲージG1、G2が接着により設けられている。中心部12へ力(F)が図1断面図中上方から加わるとG1のひずみゲージは伸び、G4のひずみゲージは縮むことになる。
つまり、ひずみゲージの設けられている起歪部の他に最弱部が存在しないため、起歪部は弾性比例限界までひずませることが可能であり、大きな信号を得られる。One of the beams will be described. Strain gauges G1 and G2 are provided on the
That is, since the weakest part does not exist other than the strain generating part provided with the strain gauge, the strain generating part can be distorted to the elastic proportional limit, and a large signal can be obtained.
各梁とも同様に働き、図2では、これらのひずみゲージで作られるホイートストンブリッジである。なお図2には、温度補償抵抗、感度調整抵抗、入力抵抗調整抵抗、零点調整抵抗は表記していない。 Each beam works similarly, and in FIG. 2 is a Wheatstone bridge made of these strain gauges. In FIG. 2, the temperature compensation resistor, the sensitivity adjustment resistor, the input resistance adjustment resistor, and the zero point adjustment resistor are not shown.
以上のように請求項1又は2の発明によれば、各梁の起歪部形状を加工面から制約されることなく、最適な形状にすることができ、必要な数を必要な位置に設けることができ、各歪検出手段であるひずみゲージを最大応力点の移動のない最大応力点へ設けることができ、直線性誤差、ヒステレリシス誤差、再現性誤差、クリープ特性に関して測定範囲の大きい高精度な小型力変換機を得ることができる。 As described above, according to the first or second aspect of the present invention, the shape of the strained portion of each beam can be made an optimal shape without being constrained from the machining surface, and a necessary number is provided at a necessary position. Strain gauges that are each strain detection means can be installed at the maximum stress point where the maximum stress point does not move, and high accuracy with a large measurement range with respect to linearity error, hysteresis error, repeatability error, and creep characteristics A small force transducer can be obtained.
11 力変換機
12 中央部
13 加重印加部
14 周縁部
15 検出ベース部材
21、22、23 梁
24、25、 26 貫通穴
31 梁
31a、31b 起歪部
G1〜G12 電気抵抗検出手段ひずみゲージDESCRIPTION OF
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JP2005144660A JP4605525B2 (en) | 2005-04-15 | 2005-04-15 | Force transducer |
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JP4605525B2 JP4605525B2 (en) | 2011-01-05 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013019895A (en) * | 2011-07-12 | 2013-01-31 | Sensata Technologies Inc | Force sensor assembly and method for assembling force sensor assembly |
JP2018049012A (en) * | 2016-09-23 | 2018-03-29 | ミネベア インテック ゲーエムベーハー | Lateral force insensitive measurement cell |
JP2019095201A (en) * | 2017-11-17 | 2019-06-20 | ユニパルス株式会社 | Load cell |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0579930A (en) * | 1991-09-18 | 1993-03-30 | Teac Corp | Load cell |
JP2003075278A (en) * | 2001-09-07 | 2003-03-12 | Teac Corp | Multi-component force detector |
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2005
- 2005-04-15 JP JP2005144660A patent/JP4605525B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0579930A (en) * | 1991-09-18 | 1993-03-30 | Teac Corp | Load cell |
JP2003075278A (en) * | 2001-09-07 | 2003-03-12 | Teac Corp | Multi-component force detector |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013019895A (en) * | 2011-07-12 | 2013-01-31 | Sensata Technologies Inc | Force sensor assembly and method for assembling force sensor assembly |
KR101846560B1 (en) * | 2011-07-12 | 2018-04-06 | 센사타 테크놀로지스, 인크 | Force sensor assembly and method for assembling a force sensor assembly |
JP2018049012A (en) * | 2016-09-23 | 2018-03-29 | ミネベア インテック ゲーエムベーハー | Lateral force insensitive measurement cell |
JP2019095201A (en) * | 2017-11-17 | 2019-06-20 | ユニパルス株式会社 | Load cell |
JP7015500B2 (en) | 2017-11-17 | 2022-02-03 | ユニパルス株式会社 | Load transducer |
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