JPS62283232A - High stress coil spring - Google Patents
High stress coil springInfo
- Publication number
- JPS62283232A JPS62283232A JP12453686A JP12453686A JPS62283232A JP S62283232 A JPS62283232 A JP S62283232A JP 12453686 A JP12453686 A JP 12453686A JP 12453686 A JP12453686 A JP 12453686A JP S62283232 A JPS62283232 A JP S62283232A
- Authority
- JP
- Japan
- Prior art keywords
- spring
- coil spring
- hardness
- intermediate portion
- fatigue
- 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.)
- Pending
Links
- 238000005260 corrosion Methods 0.000 abstract description 22
- 230000007797 corrosion Effects 0.000 abstract description 22
- 230000007423 decrease Effects 0.000 description 5
- 238000009661 fatigue test Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Springs (AREA)
Abstract
Description
【発明の詳細な説明】
λ発明の詳細な説明
（産業上の利用分野）
本発明は、自動車等におけるサスペンションばね、弁ば
ねなどに使用Ｉｎるコイルばねに関するものである。Detailed Description of the Invention [lambda] Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a coil spring used in suspension springs, valve springs, etc. in automobiles and the like.
（従来の技術）
コイルばねのへたりを減少させるためには、ばね硬さを
高めることが有効である（ばね技術研究会昭和５６年度
春季講演会前刷集第１１頁）が、ばね硬さが高くなると
、破壊靭性値Ｋｉｃが低下する（ばね技術研究会昭和６
０年度秋季講演会前刷集第４貞）。(Prior art) In order to reduce the fatigue of a coil spring, it is effective to increase the spring hardness (Spring Technology Research Group 1981 Spring Lecture Preprint Collection, p. 11). increases, the fracture toughness value Kic decreases (Spring Technology Research Group 1932)
0th Fall Lecture Preprint Collection No. 4).
ところで、一般にコイルばねを腐食環境下で長期にわた
って使用すると、ばね表面に腐食ピットが生じ、その切
欠効果によってばね疲労寿命が著しく低下する。この現
象は破壊靭性値Ｋｉｃが低いほど強くあられルる。By the way, when a coil spring is generally used for a long period of time in a corrosive environment, corrosion pits occur on the spring surface, and the notch effect of the corrosion pits significantly reduces the spring fatigue life. This phenomenon occurs more strongly as the fracture toughness value Kic decreases.
このようなことから、現在一般に用いらｎているコイル
ばねの硬さは、腐食疲労寿命によって約）ｉｖｓｓｏ以
下に抑えら１ている。For this reason, the hardness of the coil springs currently in general use is kept below about 50 mm due to corrosion fatigue life.
（発明が解決しようとする問題点）
このため、コイルばねとして必要な耐へたり性が十分得
ら１ず、設計応力を高くとることができない。その結果
、ばね線径が太くなり、かつ巻数も増えて、ばね重量が
増加するという問題がある。耐へたり性を向上させるに
は、線材に高融点金属であるＮｂ 、Ｖ、Ｍｏ 、Ｎｉ
等の元素を添加す几ばよいが°、この場合には材料コス
トの面で非常に不利になる。(Problems to be Solved by the Invention) For this reason, it is not possible to obtain sufficient fatigue resistance necessary for a coil spring, and a high design stress cannot be achieved. As a result, there is a problem that the spring wire diameter becomes thicker, the number of turns increases, and the weight of the spring increases. To improve the resistance to fatigue, high-melting point metals such as Nb, V, Mo, and Ni are added to the wire.
It would be better to add elements such as, but in this case, it would be very disadvantageous in terms of material cost.
本発明は、ばねの耐へたり性を向上させるためには、ば
ね硬さを高くすることが有効であるが、ばね硬さが高く
なると腐食疲労寿命が低下するという点に鑑みてなさ几
たものである。The present invention has been developed in consideration of the fact that, although it is effective to increase the spring hardness to improve the fatigue resistance of the spring, the corrosion fatigue life decreases as the spring hardness increases. It is something.
本発明者は、腐食疲労による折損部位かばね端末付近に
集中している点に注目し、端末付近だけを従来のものと
同等のばね高さにし、中間部分のばね硬さを高めること
によって、耐へたり性および腐食疲労強度を両立させる
高応力コイルばねを提供するものである。The inventor of the present invention focused on the fact that breakage due to corrosion fatigue is concentrated near the spring terminals, and by making only the spring height near the terminals the same as that of conventional springs and increasing the spring hardness in the middle part, The present invention provides a high-stress coil spring that has both high fatigue resistance and corrosion fatigue strength.
（問題点を解決するための手段）
本発明のコイルばねは、両端末部分の硬さをＨｖ ５５
０以下に抑えたまま、そｎ−以外の中間部分についての
°み）ｉＶ６００以上の硬さに高めたことを特徴とする
ものである。(Means for Solving the Problems) The coil spring of the present invention has a hardness of Hv 55 at both end portions.
It is characterized by increasing the hardness of the intermediate portions other than n- to iV600 or more while keeping the hardness to 0 or less.
コイルばねに対する腐食ピットによる折損は、ばね端末
近くの線間接触部に集中して発生することが、）腐食疲
労の再現試験および回収ばねの調査により確認さ几てい
る。It has been confirmed through corrosion fatigue reproduction tests and surveys of recovered springs that breakage of coil springs due to corrosion pits occurs mainly at the contact area between the wires near the spring terminals.
こ几は、ばねの端末部以外の中間部分では、塗装皮膜に
より防錆性能が高めらｔして腐食ピットが生じ難くなる
のに対し、ばね端末近くの線間接触部では、線間接触が
繰り返ですることにより、塗装皮膜が早期に摩耗し、そ
の結果、腐食ピットが生成しやすくなるからである。In this case, in the middle part of the spring other than the terminal part, the anti-rust performance is improved by the paint film, making it difficult for corrosion pits to form, whereas in the contact part between the wires near the spring terminal, contact between the wires is reduced. This is because repeating this process will cause the paint film to wear out prematurely, and as a result, corrosion pits will be more likely to form.
（作 用）
し念がって、ばね端末の線間接触部（１，５回巻き相当
分）のみをＨｖ５５０以下の硬さレベルにす几ば、残り
の中間部分をＨｖ ６００以上の硬さレベルに高めても
、腐食疲労寿命が低下しないことが予測さする。(Function) As a precaution, if only the contact part between the wires at the end of the spring (corresponding to 1.5 turns) is made to have a hardness level of Hv550 or less, the remaining middle part should be made to have a hardness of Hv600 or more. It is predicted that corrosion fatigue life will not decrease even if the corrosion fatigue life is increased to a certain level.
一方、へたシについてはばね端末部分よ）も中間部分に
おいて発生するので、ばね端末部分の硬さが軟らかくて
も、ばね中間部分がＨｖ６００以上に十分硬は几ば、ば
ね全体としてのへたシを低下させることが可能になる。On the other hand, as for fatigue, the spring terminal part) also occurs in the middle part, so even if the spring terminal part is soft, if the middle part of the spring is sufficiently hard to Hv600 or more, the spring fatigue as a whole will be reduced. This makes it possible to reduce the
上記のことから、ばね端末の１．５巻分を従来と同様Ｈ
ｖ ５５０以下の硬さに抑えるとともに、ばね中間部分
についてｕＨｖ６００以上の硬さに高めることにより、
耐へたり性及び耐腐食疲労強度の双方が満足さルること
になる。From the above, 1.5 turns of the spring terminal should be
By suppressing the hardness to less than v550 and increasing the hardness of the middle part of the spring to more than uHv600,
Both fatigue resistance and corrosion resistance are satisfied.
（実施例） 以下に本発明の一実施例を説明する。(Example) An embodiment of the present invention will be described below.
まずＣＱ、５５ｗｔ ％ 、Ｓｉ １−５５ｗｔ％、Ｍ
ｎＯ，８０Ｗ１％＋Ｐ ０．０１０ｗｔ％、 Ｓ ０．
０１２ｗｔチおよびＣｒ０．７５ｗｔ％含む鋼種（ＳＵ
Ｐ１２）の線材を用意してこｎにオイルテンパ処理を行
い、硬さ）（ｖ６３０の熱処理鋼線を製造した。つぎに
、この線材を定寸に切断し直線に加工した後、線材の両
端末の１．５巻分（要式５５０１）に相当する各々の部
分を加熱炉内にて４４０℃に再加熱した。この結果、再
加熱部の硬さは、第１図ンこ示すように平均１（Ｖ ５
００程度までに低下した。同、第１図における端末から
の距離は巻数を単位としたもので、１巻分の長さは３７
３舊である。First, CQ, 55wt%, Si 1-55wt%, M
nO, 80W1%+P 0.010wt%, S 0.
Steel type containing 0.012wt% and Cr0.75wt% (SU
A wire rod of P12) was prepared and oil tempered to produce a heat-treated steel wire with a hardness of V630.Next, this wire rod was cut to size and processed into straight lines, and then both ends of the wire were cut. Each part corresponding to 1.5 rolls (required formula 5501) of 1 (V 5
It dropped to around 00. The distance from the terminal in Figure 1 is in units of turns, and the length of one turn is 37
It is 3 舊.
しかる後、この直棒を用いて冷間でコイリングを行い、
表１に示烙するｄ元のコイルばねを製造し念。After that, cold coiling is performed using this straight rod,
We manufactured the original coil springs shown in Table 1.
表 １
ついで、このコイルはねについて腐食疲労試験および締
付けへたり試験を行った。腐食疲労試験は、食塩水の噴
霧の雰囲気中に３時間放置したのち、大気中で７５±４
０ Ｋｇ ｆ／Ｗ”の応力負荷を５０００回繰り返し加
えて、そのまま大気中に２１時間放置し、この処理を１
サイクル／１日として実施し、コイルばねが破断するま
での繰り返し回数を調べた。Table 1 Next, this coil spring was subjected to a corrosion fatigue test and a tightening fatigue test. The corrosion fatigue test was conducted after being left in a saline spray atmosphere for 3 hours, and then in the atmosphere at 75±4.
A stress load of 0 Kg f/W" was applied 5000 times, and the specimen was left in the atmosphere for 21 hours.
The test was carried out in cycles per day, and the number of repetitions until the coil spring broke was determined.
また、締付けへたシ試験に、第２図に示すように、コイ
ルばね１を、ねじ１１２で連結されたプレート３，３間
に装着し、負荷応力１１５Ｋ１１ｆ／聰２にて９６時間
だけ締め付け（２５℃）、こルによる残留せん断歪量を
測定し友。In addition, for the tightening test, as shown in Fig. 2, the coil spring 1 was installed between the plates 3 and 3 connected by screws 112, and the coil spring 1 was tightened for 96 hours at a load stress of 115K11f/2. 25℃) and measure the amount of residual shear strain caused by the test.
比較例１，２として、実施例と同一鋼種の線材を２本用
意して上記の処理に従って、そｒｂ（Ｊａの全体の硬ぢ
をＨｖ５ＱＯ，Ｈｖ ６３０ Ｋ調整したコイルばね
（表１と同一諸元のもの）を製造し、ついで、そ几ぞｎ
のコイルばねに対して、実施例と同一の条件で腐食疲労
試験およびへたり試験を行った。As Comparative Examples 1 and 2, two wire rods of the same steel type as in the example were prepared, and according to the above treatment, coil springs were prepared in which the overall hardness of the rb (Ja) was adjusted to Hv5QO and Hv630K.
(with the same specifications as Table 1), and then
A corrosion fatigue test and a fatigue test were conducted on the coil spring under the same conditions as in the example.
実施例および比較例１，２の試験結果を表２に示す。The test results of Examples and Comparative Examples 1 and 2 are shown in Table 2.
表 ２
表２の試験結果から明らかなように、本実施例のばねは
、比較例２のものに比べて耐腐食疲労強度が太１賜に増
大しているとともに、比較例１のものに比べてへたり（
永久変形）が大幅に減少している。Table 2 As is clear from the test results in Table 2, the spring of this example has greatly increased corrosion resistance fatigue strength compared to that of Comparative Example 2, and has a significantly higher corrosion resistance than that of Comparative Example 1. Tehetari (
permanent deformation) is significantly reduced.
この実施例で憔げね中間部分の硬さをｆ（Ｖ６３０とし
たが、Ｈｖ６００としても 従来ばねよりも優ｎた耐へ
たり性、腐食疲労強度が得ら几た。In this example, the hardness of the intermediate portion of the welding spring was set to f(V630), but even when the hardness was Hv600, superior fatigue resistance and corrosion fatigue strength were obtained compared to conventional springs.
（発明の効果）
成上のように本発明にょルば、端末部分を除く中間部分
を所定値以上に硬くすることにより、腐食疲労寿命の低
下を防止するとともに、コイルばねとして必要な耐へた
り性を確保することができる。したがって、Ｎｂ、Ｖ、
Ｍｏ、Ｎｉ等の高価な元素を添加しなくとも、従来より
も設計応力を高目に設定して使用することができ、コイ
ルばねの小型化、ｉｉｌ、を化を図ることができる。(Effects of the Invention) As described above, the present invention has the advantage of hardening the intermediate portion excluding the terminal portion to a predetermined value or higher, thereby preventing a decrease in corrosion fatigue life and achieving the fatigue resistance necessary for a coil spring. It is possible to ensure sex. Therefore, Nb, V,
Even without adding expensive elements such as Mo and Ni, the design stress can be set higher than in the past, and the coil spring can be made smaller and more compact.
第１図は本発明に係るコイルばねの硬で分布を示すグラ
フ、第２図はコイルばねの締め付けへたシ試験を説明す
るだめの平面図である。
１−・コイルばねFIG. 1 is a graph showing the hardness distribution of the coil spring according to the present invention, and FIG. 2 is a plan view for explaining a tightening test of the coil spring. 1-・Coil spring
Claims (1)
分の硬さをＨｖ６００以上にしたことを特徴とする高応
力コイルばね。A high stress coil spring characterized in that both end portions have a hardness of Hv550 or less, and the remaining intermediate portion has a hardness of Hv600 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12453686A JPS62283232A (en) | 1986-05-29 | 1986-05-29 | High stress coil spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12453686A JPS62283232A (en) | 1986-05-29 | 1986-05-29 | High stress coil spring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62283232A true JPS62283232A (en) | 1987-12-09 |
Family
ID=14887900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12453686A Pending JPS62283232A (en) | 1986-05-29 | 1986-05-29 | High stress coil spring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62283232A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007308067A (en) * | 2006-05-19 | 2007-11-29 | Toyota Motor Corp | Suspension spring |
| WO2016158405A1 (en) * | 2015-03-31 | 2016-10-06 | 日本発條株式会社 | Coil spring |
-
1986
- 1986-05-29 JP JP12453686A patent/JPS62283232A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007308067A (en) * | 2006-05-19 | 2007-11-29 | Toyota Motor Corp | Suspension spring |
| WO2016158405A1 (en) * | 2015-03-31 | 2016-10-06 | 日本発條株式会社 | Coil spring |
| JP2016191445A (en) * | 2015-03-31 | 2016-11-10 | 日本発條株式会社 | coil spring |
| CN107532669A (en) * | 2015-03-31 | 2018-01-02 | 日本发条株式会社 | Helical spring |
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