JPH0624749Y2 - Friction torque measuring device for screw element - Google Patents
Friction torque measuring device for screw elementInfo
- Publication number
- JPH0624749Y2 JPH0624749Y2 JP16634687U JP16634687U JPH0624749Y2 JP H0624749 Y2 JPH0624749 Y2 JP H0624749Y2 JP 16634687 U JP16634687 U JP 16634687U JP 16634687 U JP16634687 U JP 16634687U JP H0624749 Y2 JPH0624749 Y2 JP H0624749Y2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- friction torque
- nut
- screw shaft
- measuring 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 - Lifetime
Links
Landscapes
- Force Measurement Appropriate To Specific Purposes (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 本考案は、ボールねじ等のねじ要素の摩擦トルクを測定
するための装置に関する。TECHNICAL FIELD OF THE INVENTION The present invention relates to a device for measuring the friction torque of a screw element such as a ball screw.
従来の技術 ボールねじの摩擦トルクを測定するための装置として例
えば第３図および第４図に示す構造のものがある。これ
はボールねじ３０を構成するねじ軸３１の両端をベアリ
ング３２を介してプレート３３，３４に支持させ、モー
タ３５によりギヤ３６，３７を介してねじ軸３１を回転
させるようにしてある。他方、ねじ軸３１にねじ結合さ
れたナット３８には、ひずみゲージ３９が貼着された一
対の板ばね４０が取り付けられており、これらの板ばね
４０はプレート３３，３４間に配設されたガイドバー４
１に当接している。2. Description of the Related Art As a device for measuring the friction torque of a ball screw, there is one having a structure shown in FIGS. 3 and 4, for example. In this structure, both ends of a screw shaft 31 constituting the ball screw 30 are supported by plates 33 and 34 via bearings 32, and the screw shaft 31 is rotated by a motor 35 via gears 36 and 37. On the other hand, a nut 38 screwed to the screw shaft 31 is provided with a pair of leaf springs 40 to which a strain gauge 39 is attached, and these leaf springs 40 are arranged between the plates 33 and 34. Guide bar 4
It is in contact with 1.
したがって、モータ３５によりねじ軸３１を回転させる
ことでナット３８が上動または下動し、ナット３８はね
じ軸３１との間の摩擦のためにねじ軸３１の回転方向と
逆方向の摩擦トルクを発生する。その結果、板ばね４０
には該板ばね４０を変形させるような曲げ力がはたら
き、その曲げ力をひずみゲージ３９で検出することで上
記の摩擦トルクを知ることができる。Therefore, when the screw shaft 31 is rotated by the motor 35, the nut 38 is moved up or down, and the nut 38 causes a friction torque in a direction opposite to the rotation direction of the screw shaft 31 due to friction with the screw shaft 31. Occur. As a result, the leaf spring 40
A bending force that deforms the leaf spring 40 acts on the plate, and the friction torque can be known by detecting the bending force with the strain gauge 39.
考案が解決しようとする問題点 上記のような従来の装置構造においては、ねじ要素であ
るねじ軸３１とナット３８との間の摩擦トルク以外にも
ベアリング３２の摩擦トルクや板ばね４０とガイドバー
４１の間の摩擦力がひずみゲージ３９に入力されてしま
い、ねじ要素単体の摩擦トルクのみを正確に検出するこ
とが困難となる。特に第３図および第４図に例示したボ
ールねじのようにその摩擦トルクがきわめて小さい場合
には、供試体であるボールねじの摩擦トルクよりもベア
リング３２の摩擦トルクの方が大きいために、実際には
ベアリング３２の摩擦トルクが主体となって検出されて
しまうことになる。Problems to be Solved by the Invention In the conventional device structure as described above, in addition to the friction torque between the screw shaft 31 which is a screw element and the nut 38, the friction torque of the bearing 32 and the leaf spring 40 and the guide bar. The frictional force between 41 is input to the strain gauge 39, and it becomes difficult to accurately detect only the friction torque of the screw element alone. In particular, when the friction torque is extremely small like the ball screw illustrated in FIG. 3 and FIG. 4, the friction torque of the bearing 32 is larger than the friction torque of the ball screw which is the test piece. Therefore, the friction torque of the bearing 32 is mainly detected.
本考案は、上記のようにベアリング等の摩擦トルクの影
響を受けることなく、純粋にねじ要素のみの摩擦トルク
を検出できるようにした装置を提供しょうとするもので
ある。The present invention is intended to provide a device capable of purely detecting the friction torque of only the screw element without being affected by the friction torque of the bearing or the like as described above.
問題点を解決するための手段 本考案の摩擦トルク測定装置においては、実施例にも示
すように、ナットがねじ結合された２つのねじ軸が互い
に平行に並設された支持体と、２つのねじ軸およびナッ
トのうちいずれか一方を同期回転させて他方側を互いに
同方向に螺進させる回転駆動手段と、螺進する他方同士
を相互に連結する連結部材と、連結部材の中間に設けら
れて、双方のねじ軸とナットとの間の摩擦トルクの総和
を、連結部材に作用する引張力もしくは圧縮力として検
出する検出手段とから構成されているものである。MEANS FOR SOLVING THE PROBLEMS In the friction torque measuring device of the present invention, as shown in the embodiments, a support body in which two screw shafts to which nuts are screwed are arranged in parallel with each other and two support shafts are arranged in parallel with each other. A rotation driving unit that synchronously rotates one of the screw shaft and the nut to screw the other side in the same direction, a connecting member that connects the other screw-moving members to each other, and is provided in the middle of the connecting member. And a detection means for detecting the total sum of friction torques between the screw shafts and the nuts as a tensile force or a compressive force acting on the connecting member.
作用 本考案によれば、ねじ軸とナットとの組み合わせからな
るねじ要素を並設するとともに双方のナット同士を連結
することにより、従来のようにねじ要素を支持している
ベアリング等の摩擦トルクの影響を受けることがなく、
結果として２つのねじ要素の摩擦トルクの総和のみが検
出手段によって検出される。Effect According to the present invention, by arranging the screw elements formed of the combination of the screw shaft and the nuts in parallel and connecting the both nuts, the friction torque of the bearing or the like supporting the screw elements as in the conventional case is reduced. Unaffected,
As a result, only the sum of the friction torques of the two screw elements is detected by the detection means.
実施例 第１図および第２図は本考案の測定装置の一実施例を示
す図で、第３図および第４図と同様にボールねじを供試
体とする測定装置について例示している。Embodiment FIG. 1 and FIG. 2 are views showing an embodiment of the measuring device of the present invention, and exemplify the measuring device using a ball screw as a test piece as in FIGS. 3 and 4.
第１図および第２図において、４，５はアッパー側およ
びロア側の一対のプレートで、これらプレート４，５は
タイロッド６で相互に連結されて支持体７を構成してい
る。そして、支持体７には供試体である２つのボールね
じ１，１１が互いに平行に支持されている。つまり、各
ボールねじ１，１１のねじ軸２，１２の両端部がベアリ
ング８を介してプレート４，５に回転自在に支持され
る。1 and 2, a pair of upper and lower plates 4 and 5 are connected to each other by a tie rod 6 to form a support 7. Further, two ball screws 1 and 11 which are test pieces are supported on the support body 7 in parallel with each other. That is, both ends of the screw shafts 2, 12 of the ball screws 1, 11 are rotatably supported by the plates 4, 5 via the bearings 8.
一方のねじ軸２の端部にはモータ９によって回転駆動さ
れるドライブギヤ１０が取り付けられ、他方のねじ軸１
２の端部にはドライブギヤ１０に噛み合うドリブンギヤ
１４が取り付けられている。そして、双方のギヤ１０，
１４の歯数比が１：１であることから、モータ９の回転
によりねじ軸２，１２が互いに逆方向に同期回転するよ
うになっている。ただし、ねじ軸２と１２は互いに逆ね
じであって、一方のねじ軸２を右ねじとすれば他方のね
じ軸１２は左ねじとなっている。上記のように、モータ
９とギヤ１０，１４とで双方のねじ軸２，１２を同期回
転させる回転駆動手段１５を構成している。A drive gear 10 that is driven to rotate by a motor 9 is attached to the end of one screw shaft 2, and the other screw shaft 1
A driven gear 14 that meshes with the drive gear 10 is attached to the end of 2. And both gears 10,
Since the gear ratio of 14 is 1: 1, rotation of the motor 9 causes the screw shafts 2 and 12 to rotate in opposite directions synchronously. However, the screw shafts 2 and 12 are reverse screws to each other, and when one screw shaft 2 is a right screw, the other screw shaft 12 is a left screw. As described above, the motor 9 and the gears 10 and 14 constitute the rotation driving means 15 that synchronously rotates both screw shafts 2 and 12.
また、各ねじ軸２，１２に個別にねじ結合されたナット
３，１３は、略コの字状に折曲形成された連結部材とし
ての板ばね１６により相互に連結されており、板ばね１
６には検出手段としての複数のひずみゲージ１７が貼着
されている。そして、前述したようにねじ軸２，１２が
相互に逆ねじであるために、ねじ軸２，１２が同期回転
すれば双方のナット３，１３が同じ速度で上動もしくは
下動するようになっている。Further, the nuts 3 and 13 individually screwed to the screw shafts 2 and 12 are connected to each other by a plate spring 16 as a connecting member that is bent and formed in a substantially U-shape.
A plurality of strain gauges 17 serving as detecting means are attached to 6. As described above, since the screw shafts 2 and 12 are reverse screws to each other, when the screw shafts 2 and 12 rotate synchronously, both nuts 3 and 13 move up or down at the same speed. ing.
上記の実施例構造によれば、モータ９を回転させるとね
じ軸２と１２が互いに逆方向に同期回転し、それに併せ
て双方のナット３，１３が一体的に上動または下動す
る。この時、双方のナット３，１３が単独で回転するこ
とのないようにナット３，１３同士が板ばね１６によっ
て連結されているために、各ナット３，１３にはねじ軸
２，１２の回転方向と逆方向の摩擦トルクが発生し、し
かもその摩擦トルクは、ねじ軸２，１２の回転方向が互
いに逆向きであるために相互に拮抗し合うかたちとな
る。その結果、板ばね１６には引っ張りもしくは圧縮力
または曲げ力がはたらき、板ばね１６に作用した力をひ
ずみゲージ１７で取り出すことで双方のボールねじ１，
１１の摩擦トルクの総和が得られることになる。そし
て、双方のナット３，１３同士は板ばね１６により相互
に連結されて系として独立しているために、ベアリング
８等の摩擦トルクはひずみゲージ１７には入力されな
い。According to the above-described structure of the embodiment, when the motor 9 is rotated, the screw shafts 2 and 12 are synchronously rotated in opposite directions, and the nuts 3 and 13 of the both shafts are integrally moved upward or downward. At this time, since the nuts 3 and 13 are connected to each other by the leaf spring 16 so that both nuts 3 and 13 do not rotate independently, the rotation of the screw shafts 2 and 12 is performed on each nut 3 and 13. A friction torque is generated in the direction opposite to the direction, and the friction torques are in opposition to each other because the rotation directions of the screw shafts 2 and 12 are opposite to each other. As a result, a tensile or compressive force or a bending force acts on the leaf spring 16, and the force acting on the leaf spring 16 is taken out by the strain gauge 17 so that both ball screws 1,
A total of 11 friction torques will be obtained. Since both nuts 3 and 13 are connected to each other by the leaf spring 16 and are independent as a system, the friction torque of the bearing 8 or the like is not input to the strain gauge 17.
この場合において、２つのボールねじ１，１１の摩擦ト
ルクの総和を板ばね１６の中間部１６ａに設けたひずみ
ゲージ１７ａで検出するものとすれば、ナット３，１３
の回転角の違い、すなわち板ばね１６の脚部１６ｂ，１
６ｃの撓み量の違いをひずみゲージ１７ｂ，１７ｃで検
出し、その割合に応じてひずみゲージ１７ａの出力であ
る摩擦トルクの総和を振り分けるようにすれば各ボール
ねじ１，１１の個々の摩擦トルクを算出することができ
る。In this case, if the sum of the friction torques of the two ball screws 1 and 11 is detected by the strain gauge 17a provided in the intermediate portion 16a of the leaf spring 16, the nuts 3 and 13 are used.
Of the rotation angles of the two, that is, the leg portions 16b, 1 of the leaf spring 16
The difference in the flexure amount of 6c is detected by the strain gauges 17b and 17c, and the total friction torque which is the output of the strain gauge 17a is distributed according to the ratio, so that the individual friction torques of the ball screws 1 and 11 are determined. It can be calculated.
考案の効果 以上のように本考案においては、ボールねじ等のねじ要
素を互いに平行に並設するとともに、そのナット同士を
連結部材で連結し、連結部材に設けた検出手段により２
つのねじ要素の摩擦トルクの総和を連結部材のたわみ量
として検出するようにしたため、他の摺動部等の影響を
受けることなく純粋に摩擦トルクのみを正確に測定する
ことができる。その上、装置構造および測定系も単純で
あることから上記の測定精度が一段と向上する。As described above, in the present invention, screw elements such as a ball screw are arranged in parallel with each other, and nuts thereof are connected by a connecting member, and the nuts are connected by a detecting means provided on the connecting member.
Since the sum of the friction torques of the two screw elements is detected as the amount of deflection of the connecting member, it is possible to accurately measure only the friction torque without being affected by other sliding parts. Moreover, since the device structure and the measurement system are simple, the above-mentioned measurement accuracy is further improved.
第１図は本考案の測定装置の一実施例を示す構成説明
図、第２図は第１図のII−II線に沿う断面図、第３図は
従来の測定装置の一例を示す構成説明図、第４図は第３
図のIV−IV線に沿う断面図である。 １，１１…ねじ要素としてのボールねじ、２，１２…ね
じ軸、３，１３…ナット、７…支持体、９…モータ、１
０…ドライブギヤ、１４…ドリブンギヤ、１５…回転駆
動手段、１６…連結部材としての板ばね、１７…検出手
段としてのひずみゲージ。FIG. 1 is a structural explanatory view showing an embodiment of the measuring device of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a structural explanatory view showing an example of a conventional measuring device. Fig. 4 and Fig. 3
It is sectional drawing which follows the IV-IV line of a figure. 1, 11 ... Ball screw as screw element, 2, 12 ... Screw shaft, 3, 13 ... Nut, 7 ... Support, 9 ... Motor, 1
0 ... Drive gear, 14 ... Driven gear, 15 ... Rotation drive means, 16 ... Leaf spring as connecting member, 17 ... Strain gauge as detecting means.
Claims (1)
トとの間の摩擦トルクを測定する装置であって、ナット
がねじ結合された２つのねじ軸が互いに平行に並設され
た支持体と、２つのねじ軸およびナットのうちいずれか
一方を同期回転させて他方側を互いに同方向に螺進させ
る回転駆動手段と、螺進する他方同士を相互に連結する
連結部材と、連結部材の中間に設けられて、双方のねじ
軸とナットとの間の摩擦トルクの総和を連結部材に作用
するたわみ量として検出する検出手段とから構成されて
いることを特徴とするねじ要素の摩擦トルク測定装置。1. A device for measuring a friction torque between a screw shaft and a nut screw-connected to the screw shaft, wherein the two screw shafts to which the nut is screw-connected are arranged side by side in parallel with each other. A body, a rotation driving means for synchronously rotating one of the two screw shafts and a nut so as to screw the other side in the same direction, a connecting member for connecting the other screwed mutually to each other, and a connecting member Friction torque of the screw element, which is provided in the middle of the screw shaft, and is configured to detect a total friction torque between the screw shaft and the nut as a deflection amount acting on the connecting member. measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16634687U JPH0624749Y2 (en) | 1987-10-30 | 1987-10-30 | Friction torque measuring device for screw element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16634687U JPH0624749Y2 (en) | 1987-10-30 | 1987-10-30 | Friction torque measuring device for screw element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0170140U JPH0170140U (en) | 1989-05-10 |
| JPH0624749Y2 true JPH0624749Y2 (en) | 1994-06-29 |
Family
ID=31453644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16634687U Expired - Lifetime JPH0624749Y2 (en) | 1987-10-30 | 1987-10-30 | Friction torque measuring device for screw element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0624749Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4467055B2 (en) * | 2004-12-13 | 2010-05-26 | カヤバ工業株式会社 | Friction detection device, friction detection method, and shock absorber |
| JP5493795B2 (en) * | 2009-12-10 | 2014-05-14 | 株式会社ジェイテクト | Ball screw torque measuring method and apparatus |
| JP7572899B2 (en) * | 2021-04-09 | 2024-10-24 | 株式会社日本製鋼所 | Durability test machine for injection ball screw mechanism |
-
1987
- 1987-10-30 JP JP16634687U patent/JPH0624749Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0170140U (en) | 1989-05-10 |
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