JPH0765608B2 - Missing screw with excellent fatigue characteristics - Google Patents
Missing screw with excellent fatigue characteristicsInfo
- Publication number
- JPH0765608B2 JPH0765608B2 JP63051317A JP5131788A JPH0765608B2 JP H0765608 B2 JPH0765608 B2 JP H0765608B2 JP 63051317 A JP63051317 A JP 63051317A JP 5131788 A JP5131788 A JP 5131788A JP H0765608 B2 JPH0765608 B2 JP H0765608B2
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- JP
- Japan
- Prior art keywords
- thread
- screw
- load
- accumulator
- contact
- 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.)
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- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Transmission Devices (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、アキュムレータやシリンダなどの荷重変動
の激しいところに使用される引張荷重を受けるねじに関
するもので、特に、固定用及び移動用として広い範囲で
用いられる疲労特性に優れた欠如ねじに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw that receives a tensile load used in a place where the load fluctuates greatly, such as an accumulator or a cylinder, and particularly in a wide range for fixing and moving. The present invention relates to a missing screw having excellent fatigue characteristics used.
従来の技術 例えば、流体機器としてのアキュムレータは、容器本体
の内部をブラダにより気体室と液体室に仕切り、その両
端部を側板で閉鎖すると共に液体回路の液圧変動に応じ
てブラダを伸縮させ、脈動吸収作用やショックアブソー
バ作用等を行わしめているが、この容器本体と側板との
固定手段として平行ねじが用いられている。Conventional technology For example, an accumulator as a fluid device divides the inside of the container body into a gas chamber and a liquid chamber with a bladder, and closes both ends thereof with side plates and expands and contracts the bladder according to the liquid pressure fluctuation of the liquid circuit, Although pulsation absorbing action, shock absorber action and the like are performed, a parallel screw is used as a fixing means for the container body and the side plate.
発明が解決しようとする課題 ところで、アキュムレータ内の圧力が上昇し側板が外方
に押圧されると、ねじには軸方向及び周方向の荷重、所
謂変動荷重が０から最大荷重の範囲内で繰り返し加わる
がこの荷重は、各ねじ山が均一に分担するものではなく
引張力方向に大きく偏る。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, when the pressure in the accumulator rises and the side plate is pushed outward, axial and circumferential loads, so-called fluctuating loads, are repeatedly applied to the screw within the range of 0 to the maximum load. Although applied, this load is not evenly distributed among the threads, and is largely biased in the tensile force direction.
そのため、大きな引張荷重を受けるめねじ先端部の谷底
に応力集中が生じ、そこから破壊してしまう。Therefore, stress concentration occurs at the root of the female screw tip, which receives a large tensile load, and fracture occurs from there.
そこで、この問題を解決するために、既に特許されてい
る「先細状のおねじを用いた疲れ特性のすぐれたネジ継
手」（米国特許4189975号、日本国特公昭56−53651号参
照）を利用することが考えられる。Therefore, in order to solve this problem, the already patented "screw joint using tapered male screw with excellent fatigue characteristics" (see U.S. Pat. No. 4,189,975, Japanese Patent Publication No. 56-53651) is used. It is possible to do it.
本発明者は、第５図に示す様に容器本体１のめねじ２と
側板３のおねじ４とを60度三角ねじM106.8×２で形成
し、このおねじ４を前記特許に従い、ねじ山m7〜m1の山
高さｈを漸減せしめた試験用アキュムレータを製作する
と共に、前記三角ねじを標準状態で用いた従来型アキュ
ムレータを製作し、そして、シール径ｄ＝104mm、内圧
ｐ＝０〜318kg/cm2、周波数2.5HZの条件下で各アキュム
レータの各ねじ山の荷重分担率や疲労寿命を調査した。As shown in FIG. 5, the present inventor forms the female screw 2 of the container body 1 and the male screw 4 of the side plate 3 with a 60-degree triangular screw M106.8 × 2, and according to the patent, A test accumulator in which the thread height h of the threads m 7 to m 1 is gradually reduced is manufactured, and a conventional accumulator in which the triangular screw is used in a standard state is manufactured, and a seal diameter d = 104 mm and an internal pressure p = The load sharing ratio and fatigue life of each thread of each accumulator were investigated under the conditions of 0 to 318 kg / cm 2 and frequency of 2.5 HZ.
その結果、荷重分担率は、試験用アキュムレータの方
が、従来型アキュムレータより平均化していたが、疲労
寿命は、試験用アキュムレータの方が従来型アキュムレ
ータより短かった。As a result, the load sharing ratio of the test accumulator was more averaged than that of the conventional accumulator, but the fatigue life of the test accumulator was shorter than that of the conventional accumulator.
因に、荷重分担率が最も大きいねじ山は、試験用アキュ
ムレータでは、先端部2mから２番目のねじ山m2で、その
率は、18.5％、従来型アキュムレータでは、先端部から
１番目のねじ山で、その率は、21％であり、又、疲労寿
命は、従来型アキュムレータでは560.000回、試験用ア
キュムレータでは、380.000回であった。Attributable to the largest thread load distribution rate, in the test accumulator on the second thread m 2 from the tip 2m, that rate is 18.5%, in the conventional accumulators, the first thread from the distal end In the mountain, the rate was 21%, and the fatigue life was 560.000 times in the conventional accumulator and 380.000 times in the test accumulator.
ねじ山の荷重分担率が低下すると、ねじ疲労寿命が伸び
るのが通常であるが、上記試験用アキュムレータでは、
これに反し、疲労寿命が短かくなったのである。When the load sharing ratio of the screw thread decreases, the screw fatigue life is usually extended, but in the above test accumulator,
Contrary to this, the fatigue life became shorter.
そこで、その原因を調べたところ、各めねじ谷底ｆに加
わる曲げモーメント中、めねじ先端部2eの２番目のめね
じ谷底f2に最大曲げモーメントが加わり、そこから破壊
していることがわかった。即ち、おねじ４が矢印Ｙ方向
に押圧されると、めねじの各ねじ山fmは、下面に分担荷
重を受ける片持梁の状態となり、めねじ山fmの山高さfh
は、曲げモーメントの大きさに影響するスパンとみるこ
とができる。Therefore, when the cause was investigated, it was found that the maximum bending moment was applied to the second female thread root f 2 of the female thread tip 2e during the bending moment applied to each female thread root f, and the fracture occurred from there. It was That is, when the male screw 4 is pressed in the direction of the arrow Y, each thread fm of the female thread is in a cantilever state in which a shared load is applied to the lower surface, and the thread height fh of the female thread fm is fh.
Can be seen as the span that affects the magnitude of the bending moment.
そのため、山高さfhが均一化されている場合には、各ね
じ山の分担荷重が均一化されていないと、分担荷重が大
きい程曲げモーメントが大きくなり破壊しやすくなるの
である。Therefore, when the thread heights fh are made uniform, unless the shared load of each screw thread is made uniform, the larger the shared load is, the larger the bending moment becomes, and the more easily it breaks.
そこで、従来型アキュムレータと試験用アキュムレータ
のめねじ谷底に生じる単位当たりの曲げモーメントを、
荷重分担率とねじ山高さより計算したところ第４図に示
す通りであった。Therefore, the bending moment per unit generated at the root of the female thread of the conventional accumulator and the accumulator for test is calculated as
When calculated from the load sharing ratio and the thread height, it was as shown in FIG.
この図において、Ａは、従来型アキュムレータ、Ｂは、
試験用アキュムレータを示すが、試験用アキュムレータ
Ｂのめねじ先端部2eから２番目のめねじ谷底f2に13.5kg
mm/mmのピーク曲げモーメントPBが生じ、しかもそのモ
ーメントPBは、従来型アキュムレータＡのピーク曲げモ
ーメントPA＝11.4kgmm/mmより大きく、そのため、ねじ
が疲労破壊し易い事が明らかとなった。In this figure, A is a conventional accumulator and B is
The test accumulator is shown. 13.5 kg from the female thread tip 2e of the test accumulator B to the second female thread root f2.
It was revealed that a peak bending moment PB of mm / mm was generated, and that the moment PB was larger than the peak bending moment PA of the conventional accumulator A = 11.4 kgmm / mm.
この発明は、上記事事情に鑑み、ねじの疲れ特性を向上
させて疲労寿命を長くすることを目的とする。In view of the above circumstances, an object of the present invention is to improve the fatigue characteristics of a screw and prolong the fatigue life.
課題を解決するための手段 この発明は、変動荷重を受ける螺合されたねじにおい
て；引張荷重を受ける側の全ねじ山頂部の接触面を欠如
せしめて全ねじ接触高さを同一にすにするとともにその
接触面積も同一にし、全荷重の1/全ねじ山数、の荷重が
ねじの接触面積と材料応力との積に等しくなるように前
記ねじの径が定められ、他方のねじの各ねじ山高さが標
準高さに形成され、前記各ねじの接触面を対向する他方
のねじのねじ山に常時当接せしめたことにより、上記課
題を解決せんとするものである。Means for Solving the Problems The present invention relates to a screw thread that is subjected to a fluctuating load; the total thread contact height is made to be the same by eliminating the contact surface of the total thread crest on the side that receives the tensile load. The contact area is also made the same, and the diameter of the screw is set so that the load of 1 / total number of threads of the total load becomes equal to the product of the contact area of the screw and the material stress. The peak height is formed to be a standard height, and the contact surface of each screw is always brought into contact with the screw thread of the opposite screw, thereby solving the above problem.
作用 荷重変動により、螺合されたねじに変動荷重が加わる
と、引張荷重を受ける側のねじの各ねじ山に夫々分担荷
重がかかるが、全ねじ山の接触高さは、同一高さに形成
され、ねじ接触面積が等しいので、螺合締付位置がどの
ように変化しても、該ねじ山の分担荷重は略々等しいも
のとなる。Action When a fluctuating load is applied to a screw that is screwed in due to a change in load, a shared load is applied to each thread of the thread that receives the tensile load, but the contact heights of all threads are set to the same height. Since the screw contact areas are the same, the shared load of the screw threads is substantially the same no matter how the screw tightening position changes.
そのため、各ねじ谷底に発生する曲げモーメントが平均
化されるので、ピーク曲げモーメントは、大きく低減す
る。Therefore, since the bending moments generated at the thread roots are averaged, the peak bending moment is greatly reduced.
実施例 この発明の実施例を添付図面により説明するが同一図面
符号はその名称も機能も同一である。Embodiments Embodiments of the present invention will be described with reference to the accompanying drawings, but the same reference numerals have the same names and functions.
第２図は、アキュムレータACCの縦断面図であり、容器
本体10の内部は、ブラダ11により気体室12と液体室13に
仕切られ、又、この本体10の両端部14、15は、側板16、
17により閉鎖されている。FIG. 2 is a vertical cross-sectional view of the accumulator ACC. The inside of the container body 10 is divided into a gas chamber 12 and a liquid chamber 13 by a bladder 11, and both ends 14 and 15 of the body 10 are provided with side plates 16. ,
Closed by 17.
この本体10の両端部14、15と側板16、17は、螺着されて
いるが、そのねじ部Ｓは、第１図に示すごとく形成され
ている。Both ends 14 and 15 of the main body 10 and the side plates 16 and 17 are screwed to each other, and the screw portion S thereof is formed as shown in FIG.
即ち、容器本体10の端部14の内側には、側板16のおねじ
19と螺合するめねじ20が形成されている。That is, inside the end 14 of the container body 10, the male screw of the side plate 16
A female screw 20 that is screwed with the screw 19 is formed.
このめねじ20は、10個のめねじ山FSを備えているが、全
ねじ山を同一高さに山頂切りして山頂部接触面を欠如せ
しめ、全ねじ接触高さＬを同一高さにしてめねじのねじ
山FSがおねじのねじ山MSと接触する部分、所謂、めねじ
の接触面積FW、を同一にする。This female screw 20 is provided with 10 female screw threads FS, but the whole screw threads are summed to the same height to eliminate the contact surface at the summit portion, and the total screw contact height L is made to be the same height. The portion where the thread FS of the internal thread contacts the thread MS of the external thread, that is, the contact area FW of the internal thread, is made the same.
めねじ谷底f1〜f10は、円弧状に形成され、その半径fr
は、ピッチの0.1〜0.18倍の大きさである。Female thread roots f 1 to f 10 are formed in an arc shape and have a radius fr
Is 0.1 to 0.18 times the pitch.
おねじ19の各ねじ山高さmhは、標準高さに形成されてい
る。Each thread height mh of the male screw 19 is formed to a standard height.
なお、25は、必要以上のねじ込みを防止するためのスト
ッパ、Ｃは、中心線である。In addition, 25 is a stopper for preventing excessive screwing, and C is a center line.
次に、この実施例の作動について説明する。液圧回路30
の液圧が変動し、給排口23からアキュムレータACC内に
液体が圧入されるとブラダ11が圧縮され気体室12内の圧
力が上昇して側板16を矢印A2方向に押圧する。Next, the operation of this embodiment will be described. Hydraulic circuit 30
When the liquid pressure fluctuates and liquid is pressed into the accumulator ACC from the supply / discharge port 23, the bladder 11 is compressed and the pressure in the gas chamber 12 rises to press the side plate 16 in the direction of arrow A2.
そのため、おねじ19も同方向に押されるので、これと螺
合しているめねじ20にも荷重が加わるので、各ねじ山FS
1-10には、分担荷重W1-10がかかる。Therefore, the male screw 19 is also pushed in the same direction, and the load is also applied to the female screw 20 that is screwed with this, so that each thread FS
The shared load W 1-10 is applied to 1-10 .
しかし、この分担荷重が、大きすぎると、そのねじ山FS
が弾性限度内変形と塑性変形を起こし、めねじのピッチ
が変化すると共に各ねじ山FSの現実に受け止める荷重
は、弾性限度内変形の力分だけ荷重を受け持ちそれ以外
の荷重は、次のねじ山に回される。However, if this shared load is too large, the thread FS
Causes elastic deformation within the elastic limit and plastic deformation, the pitch of the female thread changes, and the load actually received by each thread FS is the load corresponding to the force within the elastic limit, and the other loads are Turned into the mountains.
また、分担すべき伝達荷重に対して該ねじ接触面積が大
きいと、該ねじは、弾性限度内変形分だけ荷重を受け持
ち、それ以外の荷重は次のねじ山に回される。Further, when the screw contact area is large with respect to the transmission load to be shared, the screw bears a load corresponding to the deformation within the elastic limit, and the other loads are passed to the next thread.
この分担荷重は、めねじの接触面積FWの大きさにより規
制されているが、全ねじ山FS10-1の接触高さＬが等しい
ため、その接触面積FWは、夫々等しくなるので、螺合締
付位置がどのように変化しても、現実に分担する各ねじ
山FS1-10の荷重は略々等しくなるように引っ張り荷重を
受けるめねじの内径が定められ、更に述べると、全荷重
の1/全ねじ山数、の荷重がねじの接触面積と材料応力と
の積に等しくなるようにめねじ内径が定められている。This shared load is regulated by the size of the contact area FW of the female screw, but since the contact heights L of all the screw threads FS 10-1 are equal, the contact areas FW are equal to each other. The inner diameter of the female thread that receives the tensile load is determined so that the load of each thread FS 1-10 that is actually shared is approximately the same no matter how the tightening position changes. The internal diameter of the internal thread is determined so that the load of 1 / total number of threads, equal to the product of the contact area of the thread and the material stress.
つまり、各ねじ山の接触高さと分担荷重が等しいので、
各ねじ谷底f1-10に生ずる曲げモーメントも略々均等の
ものとなる。In other words, since the contact height of each screw thread is equal to the shared load,
The bending moments generated at the thread roots f 1-10 are also substantially equal.
従って、めねじ20のねじ谷底に生ずる単位当たりのピー
ク曲げモーメントPCは、従来型アキュムレータより大き
く低減されるので疲労寿命を長くすることが出来る。Therefore, since the peak bending moment PC per unit generated at the thread root of the female screw 20 is greatly reduced as compared with the conventional accumulator, the fatigue life can be lengthened.
因に、本発明によるねじを用いたアキュムレータを製作
し、前記実験と同じ条件下でめねじ谷底f1-10に生じる
曲げモーメントとねじの疲労寿命を調査したところ、曲
げモーメントは、第４図の直線Ｃに示す通りとなり、そ
のピーク曲げモーメントPCは3.482kg.mm/mmとなり、ま
た、疲労寿命は、10,000,000回以上でり従来型アキュム
レータの20倍以上となった。Incidentally, when an accumulator using a screw according to the present invention was manufactured and the bending moment and the fatigue life of the screw generated in the female thread root f 1-10 were investigated under the same conditions as in the above experiment, the bending moment was as shown in FIG. As shown by the straight line C, the peak bending moment PC was 3.482 kg.mm/mm, and the fatigue life was 10,000,000 times or more, which was more than 20 times that of the conventional accumulator.
この発明は、三角ねじに限らず、角ねじ、丸ねじ、台形
ねじ等にも利用できることは言うまでもない。It goes without saying that the present invention can be applied not only to triangular screws but also to square screws, round screws, trapezoidal screws and the like.
また、めねじの全ねじ山を同一高さに山頂切り整形する
代わりに、第３図に示すように、めねじ山FSの山頂部接
触面FSLを削り、めねじ接触高さＬを同一高さに形成し
ても良い。Also, instead of cutting and shaping all the threads of the female thread to the same height, as shown in FIG. 3, the contact surface FSL of the crest portion of the female thread FS is ground to make the female thread contact height L the same height. It may be formed into
発明の効果 この発明は以上の様に構成したので、各ねじ山の接触面
積は、等しく、且つ、小さくなる。EFFECTS OF THE INVENTION Since the present invention is configured as described above, the contact areas of the threads are equal and small.
そのため、該ねじ山の現実の分担荷重は、螺合位置締付
位置の変化にかかわり無く平均化し、該ねじ山のねじ谷
底に生じる曲げモーメントも略々等しくなる。Therefore, the actual shared load of the screw thread is averaged regardless of the change in the screwing position and the tightening position, and the bending moments generated at the screw roots of the screw thread are also substantially equal.
従って、ねじ谷底に生じるピーク曲げモーメントが従来
例に比べ低減するので疲労特性が向上し、疲労寿命が長
くなる。Therefore, the peak bending moment generated at the thread root is reduced as compared with the conventional example, so that the fatigue characteristics are improved and the fatigue life is extended.
第１図〜第４図は、この発明の実施例を示す図で、第１
図は、縦断面拡大図で、第２図のねじ部拡大図、第２図
は、アキュムレータの縦断面図、第３図は、他の実施例
を示す拡大図で第１図相当する図、第４図は、各ねじ谷
底と曲げモーメントの関係を示す図、第５図は従来例の
拡大断面図の一部を示す図である。 19……おねじ 20……めねじ FS……めねじのねじ山 Ｌ……接触高さ MS……おねじ山1 to 4 are views showing an embodiment of the present invention.
The figure is an enlarged vertical cross-sectional view, an enlarged view of the screw portion of FIG. 2, FIG. 2 is a vertical cross-sectional view of the accumulator, and FIG. 3 is an enlarged view of another embodiment, which corresponds to FIG. FIG. 4 is a diagram showing a relationship between each thread root and a bending moment, and FIG. 5 is a diagram showing a part of an enlarged sectional view of a conventional example. 19 …… Male thread 20 …… Female thread FS …… Female thread thread L …… Contact height MS …… Male thread
Claims (1)
て； 引張荷重を受ける側の全ねじ山頂部の接触面を欠如せし
めて全ねじ接触高さを同一にするとともにその接触面積
も同一にし； 全荷重の1/全ねじ山数、の荷重がねじの接触面積と材料
応力との積に等しくなるように前記ねじの径が定めら
れ； 他方のねじの各ねじ山高さが標準高さに形成され； 前記各ねじの接触面を対向する他方のねじのねじ山に常
時当接せしめたことを特徴とする疲労特性に優れた欠如
ねじ。Claim: What is claimed is: 1. In a threaded screw which receives a variable load, the contact surface of all thread crests on the side receiving a tensile load is made to be the same so that the contact height of all the screws is the same and the contact area is the same; The diameter of the thread is determined so that the load of 1 / total number of threads, equal to the product of the contact area of the thread and the material stress, is determined; the height of each thread of the other thread is set to the standard height. A missing screw having excellent fatigue characteristics, characterized in that the contact surface of each of the screws is always brought into contact with the thread of the opposite screw.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63051317A JPH0765608B2 (en) | 1988-03-04 | 1988-03-04 | Missing screw with excellent fatigue characteristics |
| GB8827739A GB2215429B (en) | 1988-03-04 | 1988-11-28 | Stepped thread joint |
| SE8804347A SE469484B (en) | 1988-03-04 | 1988-11-30 | THREADING TAPES WITH STEPING AND CUTTING THREADS |
| DE3840731A DE3840731C2 (en) | 1988-03-04 | 1988-12-02 | Internal thread on a pressure vessel |
| FR8816066A FR2628171B1 (en) | 1988-03-04 | 1988-12-07 | THREADED THREADED JOINT AND SECTIONAL THREADED JOINT HAVING EXCELLENT FATIGUE RESISTANCE |
| KR1019880016588A KR950005837B1 (en) | 1988-03-04 | 1988-12-13 | Stepped thread and cutoff thread joint having excellent fatigue resistance |
| CN89100004A CN1027771C (en) | 1988-03-04 | 1989-01-09 | Stepped thread and cutoff thread joint exhibiting excellent fatigue resistance |
| US07/431,675 US4943095A (en) | 1988-03-04 | 1989-11-02 | Stepped thread and cutoff thread joint exhibiting excellent fatigue resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63051317A JPH0765608B2 (en) | 1988-03-04 | 1988-03-04 | Missing screw with excellent fatigue characteristics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01224509A JPH01224509A (en) | 1989-09-07 |
| JPH0765608B2 true JPH0765608B2 (en) | 1995-07-19 |
Family
ID=12883539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63051317A Expired - Fee Related JPH0765608B2 (en) | 1988-03-04 | 1988-03-04 | Missing screw with excellent fatigue characteristics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0765608B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE514137C2 (en) * | 1998-03-24 | 2001-01-08 | Sandvik Ab | Threaded joints for striking drilling, male and female part to be included in a threaded joint for striking drilling as well as method for manufacturing a product with a thread to be included in a threaded joint for striking drilling |
| US6332741B1 (en) * | 2000-09-19 | 2001-12-25 | Textron, Inc. | Masonry anchor device |
| JP2016053379A (en) * | 2014-09-03 | 2016-04-14 | 株式会社大林組 | Female screw structure and forming method of female screw |
| DE102021003255A1 (en) * | 2021-06-24 | 2022-12-29 | Hydac Technology Gmbh | hydraulic accumulator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5949628B2 (en) * | 1977-06-10 | 1984-12-04 | 株式会社東芝 | optical character reader |
-
1988
- 1988-03-04 JP JP63051317A patent/JPH0765608B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01224509A (en) | 1989-09-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |