JPH0239584B2 - - Google Patents
Info
- Publication number
- JPH0239584B2 JPH0239584B2 JP59267980A JP26798084A JPH0239584B2 JP H0239584 B2 JPH0239584 B2 JP H0239584B2 JP 59267980 A JP59267980 A JP 59267980A JP 26798084 A JP26798084 A JP 26798084A JP H0239584 B2 JPH0239584 B2 JP H0239584B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- test
- piston ring
- resistance
- piston
- 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
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 239000011651 chromium Substances 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 5
- 238000012360 testing method Methods 0.000 description 39
- 239000010410 layer Substances 0.000 description 17
- 239000000463 material Substances 0.000 description 14
- 238000005121 nitriding Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 150000004767 nitrides Chemical class 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000007747 plating Methods 0.000 description 5
- -1 Carbon forms carbides Chemical class 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 239000002699 waste material Substances 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
Description
イ 産業上の利用分野
本発明はピストンリングに関し、更に詳述すれ
ば、内燃機関用として特に好適な改良されたピス
トンリングに関する。
ロ 従来技術
近年、内燃機関の軽量化と高出力化に伴い、ピ
ストンリングに要求される品質が高度となり、現
在、その材料には鋼としてはばね銅等が使用され
ているが、ピストンリングとして要求される諸特
性を必ずしも満足していない。更に、現在のピス
トンリングの多くは耐摩耗性を向上させるために
硬質クロムめつきを施しており、めつき処理に長
時間を要することと、廃液処理がコスト高の原因
になつているため、めつきを施さずとも充分使用
に耐える耐摩耗性を有し、耐熱性や靭性に優れる
ピストンリングの開発が望まれている。
ハ 発明の目的
本発明は上記に鑑みてなされたものであつて、
ピストンリングに要求される諸特性を備え、硬質
クロムめつきを施さずとも充分な耐摩耗性を有す
るピストンリングを提供することを目的としてい
る。
ニ 発明の構成
即ち、本発明の第１の発明は、炭素0.60重量％
以上0.70重量％未満、珪素0.2〜1.0重量％、クロ
ム17.0〜18.0重量％、モリブデン0.8〜1.5重量％、
バナジウム0.05〜0.15重量％、残部が実質的に鉄
からなるピストンリングに係る。
本発明の第２の発明は、炭素0.60重量％以上
0.70重量％未満、珪素0.2〜1.0重量％、クロム
17.0〜18.0重量％、モリブデン0.8〜1.5重量％、
バナジウム0.05〜0.15重量％、残部が実質的に鉄
からなり、少なくとも外周面に窒化層を有するピ
ストンリングに係る。
先ず、第１の発明について説明する。
炭素は鉄、クロム、モリブデン、バナジウムと
共に炭化物を形成して耐摩耗性に寄与する。これ
が0.60重量％（以下、重量％を単に「％」で表わ
す。）未満では炭化物の形成量が不足で上記効果
が不充分であり、0.70％以上になると靭性が低下
するようになるので、その範囲を0.60％上0.70％
未満とする。
珪素は耐熱性を改善するが0.2％未満ではこの
効果が不充分であり、1.0％を越えると脆化させ
るようになるので、その範囲を0.2〜1.0％とす
る。
クロムは炭化物を形成して耐摩耗性及び耐スカ
ツフ性に寄与する。また、第２の発明にあつては
窒化層の硬度を昇げて耐スカツフ性を改善する。
これが17.0％未満では炭化物の硬度が低く、耐摩
耗性、耐スカツフ性に与える効果が不充分であ
り、18.0％を越えると冷間加工性が著しく損われ
るようになるので17.0〜18.0％の範囲とする。
モリブデンは炭化物を形成して耐摩耗性に寄与
し、第２の発明にあつてはクロムによる脆化を防
ぐと共に窒化層の硬度を昇げて耐スカツフ性を改
善する。これが0.8％未満では上記効果が不充分
であり、1.5％を越えて多量に含有させてもその
効果の増大は顕著ではないので、0.8〜1.5％の範
囲とする。
バナジウムは炭化物を形成して耐摩耗性を改善
し、更に、焼戻し軟化に対する抵抗力を付与す
る。0.05％未満では上記効果が不充分であり、
0.15％を越えても、効果の増大は顕著ではないの
で、その範囲を0.05〜0.15％とする。
次に第２の発明について説明する。第２の発明
は上記第１の発明に係るピストンリングに窒化層
処理を施してその少なくとも摺動面（ピストンリ
ングの外周面）に窒化層を成形させることによ
り、耐スカツフ性や耐摩耗性の一層改善されたピ
ストンリングに係る。窒化処理としてはガス窒
化、ガス軟窒化、塩浴窒化、イオン窒化等いずれ
の窒化法によることができる。
ホ 実施例
次に実施例について説明する。
第１の発明の試料として、0.66％Ｃ、0.70％Si、
17.56％Cr、1.12％Mo、0.13％Ｖ、残部実質的に
Feよりなる合金鋼を、第２の発明の試料として
上記の合金鋼に通例のガス窒化処理を施した試料
を、比較材としてオイルテンパーを施した弁ばね
用鋼SWOSC−Ｖを、同じく比較材として硬質ク
ロムめつきを施した鋳鉄を用意し、以下の試験を
行つた。
(1) 摩耗試験
試験装置は第１図に要部を図解的に示すもの
で、ステータホルダ１に取外し可能に取付けら
れた直径80mmの円板２の中央には裏側から注油
孔３を通して潤滑油が注油される。ステータホ
ルダ１には図示省略した油圧装置によつて図に
於いて右方に向けて所定圧力で押圧力が作用す
るようにしてある。円板２に相対向してロータ
４があり、図示省略した駆動装置によつて所定
速度で回転するようにしてある。ロータ４に取
外し可能に取付けられた試験片保持具６には５
mm角、高さ10mmの試験片が同心円上に等間隔に
４個取付けてある。このような装置に於いてス
テータホルダ１に所定の押圧力をかけ、所定の
面圧で円板（相手材）２と試験片とが接触する
ようにしておいて、注油孔３３から摺動面に所
定給油速度で給油しながらロータ４を回転させ
る。このような試験装置によつて試験を行い、
試験後、試験片６を取外して摩耗による高さ寸
法の減少を測定した。試験片６の内、表面処理
を施したものについては、その表面層を円板２
に接触させた。
試験条件は次に示す通りである。相手円板材
料：シリンダライナ用鋳鉄FC25、摩擦速度：
３ｍ／sec、５ｍ／sec、潤滑油及び給油条件：
アルミナ粉（粒度５〜50μｍ）１ｇ／入り
＃30モーターオイル、油温80℃、350〜400cc／
min、接触面圧：100Kg／cm2、摩擦距離：30Km。
試験結果は第３図に示す通りである。同図か
ら解るように、第１の発明に係るピストンリン
グの材料は比較のSWOSC−Ｖに比べて遥かに
摩耗量が少なく、従来から耐摩耗性に優れると
いわれているクロムめつき層と同等の耐摩耗性
を示しており、窒化層を有する第２の発明に係
るピストンリングの材料はクロムめつき層より
も摩耗量が少なくなつており、一層耐摩耗性が
改善されている。
摩耗試験については、炭素含有量を前記の
0.66％のほかに0.50％、0.55％、0.60％とし、
他の合金元素の含有量は前記と実質的に同じに
して同様の試験を行つた。但し、窒化処理は施
していない。試験結果は下記第１表に示す通り
である。
A. Field of Industrial Application The present invention relates to a piston ring, and more specifically, to an improved piston ring particularly suitable for use in internal combustion engines. (b) Prior art In recent years, as internal combustion engines have become lighter and have higher output, the quality required for piston rings has become higher.Currently, spring copper and other materials are used as steel for piston rings; It does not necessarily satisfy the required characteristics. Furthermore, many of today's piston rings are plated with hard chrome to improve wear resistance, and the plating process takes a long time and waste liquid treatment is a cause of high costs. It is desired to develop a piston ring that has enough wear resistance to withstand use without plating, and has excellent heat resistance and toughness. C. Purpose of the invention The present invention has been made in view of the above, and
It is an object of the present invention to provide a piston ring that has various properties required of a piston ring and has sufficient wear resistance without hard chrome plating. D. Structure of the invention That is, the first invention of the present invention is that carbon 0.60% by weight
more than 0.70% by weight, silicon 0.2-1.0% by weight, chromium 17.0-18.0% by weight, molybdenum 0.8-1.5% by weight,
It relates to a piston ring consisting of 0.05 to 0.15% by weight of vanadium and the remainder substantially iron. The second invention of the present invention is carbon 0.60% by weight or more.
Less than 0.70% by weight, silicon 0.2-1.0% by weight, chromium
17.0-18.0% by weight, molybdenum 0.8-1.5% by weight,
The present invention relates to a piston ring containing 0.05 to 0.15% by weight of vanadium, the remainder being substantially iron, and having a nitrided layer on at least the outer peripheral surface. First, the first invention will be explained. Carbon forms carbides with iron, chromium, molybdenum, and vanadium and contributes to wear resistance. If this is less than 0.60% by weight (hereinafter, weight% is simply expressed as "%"), the amount of carbide formed is insufficient and the above effect is insufficient, and if it is more than 0.70%, the toughness will decrease. Range 0.60% up 0.70%
less than Silicon improves heat resistance, but if it is less than 0.2%, this effect is insufficient, and if it exceeds 1.0%, it becomes brittle, so the range is set to 0.2 to 1.0%. Chromium forms carbides and contributes to wear resistance and scuff resistance. Further, in the second invention, the hardness of the nitrided layer is increased to improve scuff resistance.
If it is less than 17.0%, the hardness of the carbide will be low and the effect on wear resistance and scuff resistance will be insufficient, and if it exceeds 18.0%, cold workability will be significantly impaired, so it should be in the range of 17.0 to 18.0%. shall be. Molybdenum forms carbides and contributes to wear resistance, and in the second invention, it prevents embrittlement due to chromium and increases the hardness of the nitrided layer to improve scuff resistance. If it is less than 0.8%, the above effect is insufficient, and even if it is contained in a large amount exceeding 1.5%, the effect will not increase significantly, so it is set in the range of 0.8 to 1.5%. Vanadium forms carbides to improve wear resistance and also provides resistance to temper softening. If it is less than 0.05%, the above effects are insufficient;
Even if it exceeds 0.15%, the effect is not significantly increased, so the range is set at 0.05 to 0.15%. Next, the second invention will be explained. The second invention improves scuff resistance and wear resistance by subjecting the piston ring according to the first invention to a nitride layer treatment and forming the nitride layer on at least the sliding surface (the outer peripheral surface of the piston ring). It concerns a further improved piston ring. As the nitriding treatment, any nitriding method such as gas nitriding, gas soft nitriding, salt bath nitriding, ion nitriding, etc. can be used. E. Example Next, an example will be described. As a sample of the first invention, 0.66%C, 0.70%Si,
17.56%Cr, 1.12%Mo, 0.13%V, balance substantially
An alloy steel made of Fe was used as a sample of the second invention, which was obtained by subjecting the above alloy steel to the usual gas nitriding treatment, and a steel for valve springs, SWOSC-V, which was subjected to oil tempering, was used as a comparative material. We prepared cast iron with hard chrome plating and conducted the following tests. (1) Wear test The main parts of the test device are schematically shown in Figure 1. Lubricating oil is poured into the center of a disc 2 with a diameter of 80 mm that is removably attached to a stator holder 1 through an oil fill hole 3 from the back side. is lubricated. A pressing force is applied to the stator holder 1 by a hydraulic device (not shown) at a predetermined pressure toward the right in the figure. A rotor 4 is provided opposite to the disk 2, and is rotated at a predetermined speed by a drive device (not shown). The test specimen holder 6 removably attached to the rotor 4 has five
Four specimens measuring mm square and 10 mm in height are mounted on a concentric circle at equal intervals. In such a device, a predetermined pressing force is applied to the stator holder 1 so that the disk (mating material) 2 and the test piece come into contact with each other with a predetermined surface pressure, and the sliding surface is The rotor 4 is rotated while being refueled at a predetermined refueling speed. Testing is carried out using such testing equipment,
After the test, the test piece 6 was removed and the reduction in height due to wear was measured. Among the test pieces 6, for those that have been surface-treated, the surface layer is transferred to the disk 2.
was brought into contact with. The test conditions are as follows. Mating disc material: Cast iron FC25 for cylinder liner, Friction speed:
3m/sec, 5m/sec, lubricating oil and oil supply conditions:
Alumina powder (particle size 5-50μm) 1g/contains #30 motor oil, oil temperature 80℃, 350-400cc/
min, contact pressure: 100Kg/cm 2 , friction distance: 30Km. The test results are shown in Figure 3. As can be seen from the figure, the material of the piston ring according to the first invention has much less wear than the comparative SWOSC-V, and is equivalent to the chrome plating layer, which has been said to have excellent wear resistance. The material of the piston ring according to the second invention having a nitrided layer has a smaller amount of wear than a chromium-plated layer, and the wear resistance is further improved. For the wear test, the carbon content was
In addition to 0.66%, 0.50%, 0.55%, and 0.60%,
Similar tests were conducted with the contents of other alloying elements being substantially the same as above. However, nitriding treatment was not performed. The test results are shown in Table 1 below.
【表】
第１表から、炭素含有量が0.60％未満になる
と摩耗量が急に増大するようになることが理解
できる。
(2) スカツフ試験
試験は前記摩耗試験に使用した試験装置によ
り、次のような方法で行つた。即ち、前記摩耗
試験に於けるように、試験片６を円板２に摺動
させ、一定時間毎にステータホルダ１に作用す
る圧力を階段的に増加していき、試験片６の円
板２との間の摩擦によつてステータホルダ１に
生ずるトルク（摩擦力）Ｔを、第１図の−
線に沿う矢視側面図である第２図に示すスピン
ドル７を介してロードセル８に作用せしめ、そ
の変化を動歪計９で読み、記録計１０に記録さ
せる。トルクＴが急激に上昇したとき、スカツ
フが生じたものとし、そのときの接触面圧を以
つてスカツフ発生面圧とし、その大小を以つて
耐スカツフ性の良否を判断する。
試験条件は次に示す通りである。摩擦速度：
８ｍ／sec、潤滑油：モータオイル＃30、接触
面圧：40Kg／cm2から３分間経過毎に10Kg／cm2ず
つ上昇、その余の条件は前記摩耗試験に於ける
と同様である。
試験結果は第４図に示す通りである。同図か
ら解るように、第１の発明に係る試料は硬質ク
ロムめつき層と同程度のスカツフ発生面圧を示
している。窒化層が形成されている第２の発明
に係るピストンリングの材料は第１の発明に係
るそれよりも一層耐スカツフ性が改善されてい
る。
(3) 張力減退試験
76.0mm×1.2mm×3.1mm、合い口隙間0.3mm、自
由合い口隙間9.0mmのプレーン形圧カリングに
よつてJIS Ｂ 8032「ピストンリング」に規定
されている張力減退試験を行つた。加熱温度は
規定通りの300℃したが、加熱時間は規格の１
時間のほかに５時間及び10時間についても行つ
た。
試験結果は第５図に示す通りである。同図か
ら、比較のSWOSC−Ｖに比べて、本発明に基
くピストンリングは、いずれも張力減退度が極
めて低く、優れた耐熱性を有することが解る。
（JIS規格では300℃、１時間の加熱で10％以下
と規定されている。）
張力減退試験に供した第１の発明に基くピス
トンリングは、第６図に示すように、前述した
化学組成の材料１１からなつてい。
同じく第２の発明に基くピストンリングは、
第７図に示すように、窒化処理によつて外周面
及び内周面には母材１１上に窒化層１２ａ，１
２ｃが夫々形成されている。内周面の窒化層１
２ｃは、圧力リングには不要なものである（組
合せオイルリングのレールにあつてはスペーサ
エキスパンダの耳部（図示せず）と摺接するの
で、有効である。）が、窒化処理時に外周面の
窒化層１２ａと同時に形成されたものである。
また、窒化処理に際しては、ピストンリングを
多数上、下面を合わせてスタツクしておいて窒
化処理したため、上、下面には窒化層が形成さ
れていない。
然し、ピストンリングを上記のようにスタツ
クしないで窒化処理を施せば、第８図のよう
に、内、外周面のほかに上、下面にも窒化層１
２ｂが形成され、ピストンのリング溝側面（図
示せず）との間の耐摩耗性が改善される。
(4) ピストンへの装着試験
前記張力減退試験に供したと同じ製造ロツト
中のピストンリング及び炭素含有量を0.70％、
1.10％とし、他の合金元素の含有量は前記と実
質的に同じとしたピストンリング各100本につ
いて、ピストンへの装着に必要なだけ合い口を
拡げ、クラツク発生の有無を調べた。合い口の
拡大には、エンジン組立て時に使用されるピス
トンリング装着工具を使用した。その結果は下
記第２表に示す通りである。[Table] From Table 1, it can be seen that when the carbon content becomes less than 0.60%, the amount of wear suddenly increases. (2) Skatuuf test The test was conducted in the following manner using the test equipment used in the abrasion test described above. That is, as in the abrasion test described above, the test piece 6 is slid on the disk 2, and the pressure acting on the stator holder 1 is increased in a stepwise manner at regular intervals. The torque (frictional force) T generated on the stator holder 1 due to the friction between the
It acts on the load cell 8 through the spindle 7 shown in FIG. 2, which is a side view taken along the line, and the change is read by the dynamic strain meter 9 and recorded by the recorder 10. When the torque T suddenly increases, it is assumed that a scuff occurs, and the contact surface pressure at that time is taken as the scuff-generating surface pressure, and the quality of the scuff resistance is judged based on its magnitude. The test conditions are as follows. Friction speed:
8 m/sec, lubricating oil: motor oil #30, contact surface pressure: 40 Kg/cm 2 and increasing by 10 Kg/cm 2 every 3 minutes.Other conditions were the same as in the above wear test. The test results are shown in Figure 4. As can be seen from the figure, the sample according to the first invention exhibits a scuff-generating surface pressure comparable to that of the hard chromium plated layer. The material of the piston ring according to the second invention in which the nitrided layer is formed has further improved scuff resistance than that according to the first invention. (3) Tension reduction test Tension reduction test specified in JIS B 8032 "Piston Ring" by plain pressure culling with 76.0 mm x 1.2 mm x 3.1 mm, joint gap 0.3 mm, free joint gap 9.0 mm. I went there. The heating temperature was 300℃ as specified, but the heating time was 1.
In addition to time, we also conducted tests for 5 hours and 10 hours. The test results are shown in FIG. From the same figure, it can be seen that, compared to the comparative SWOSC-V, the piston rings based on the present invention all have an extremely low degree of tension loss and excellent heat resistance.
(The JIS standard stipulates that it is 10% or less when heated at 300°C for 1 hour.) The piston ring based on the first invention that was subjected to the tension reduction test had the chemical composition described above as shown in Figure 6. Made from material 11. The piston ring also based on the second invention is
As shown in FIG. 7, nitrided layers 12a and 1
2c are formed respectively. Nitride layer 1 on inner peripheral surface
2c is unnecessary for the pressure ring (it is effective for the rail of the combination oil ring because it makes sliding contact with the spacer expander ear (not shown)), but it is This layer was formed simultaneously with the nitride layer 12a.
Further, during the nitriding process, a large number of piston rings were stacked with their upper and lower surfaces together and then nitrided, so no nitrided layer was formed on the upper and lower surfaces. However, if the piston rings are nitrided without being stacked as described above, a nitrided layer 1 is formed not only on the inner and outer peripheral surfaces but also on the upper and lower surfaces, as shown in Fig. 8.
2b is formed to improve wear resistance between the piston and the ring groove side surface (not shown). (4) Attachment test to piston Piston rings in the same production lot as those used in the tension reduction test and carbon content of 0.70%,
For each of 100 piston rings with the content of 1.10% and other alloying elements substantially the same as above, the gap was widened as necessary for mounting on the piston, and the presence or absence of cracks was examined. To enlarge the gap, we used a piston ring installation tool used when assembling the engine. The results are shown in Table 2 below.
【表】
第２表から、炭素含有量が0.70％以上になる
と、靭性低下によるクラツクが発生し、信頼性
に欠けるようになることが理解できる。
ヘ 発明の効果
以上説明したように、第１の発明に係るピスト
ンリングの材料は極めて優れた耐摩耗性、耐スカ
ツフ性を有しており、その第２の発明に係るピス
トンリングの材料は更に一層摩耗性、耐スカツフ
性が改善されている。また、いずれも優れた耐熱
性を有していて、これらの材料で製造されたピス
トンリングは張力減退度が極めて低い。従つて、
本発明に基くピストンリングを使用するときは、
ピストンリングの耐久性が著しく向上していて、
内燃機関のオーバーホールから次のオーバーホー
ル迄の所謂開放期間が大幅に延長され、産業上の
利用価値は大きい。[Table] From Table 2, it can be seen that when the carbon content exceeds 0.70%, cracks occur due to a decrease in toughness, resulting in a lack of reliability. F. Effects of the Invention As explained above, the material of the piston ring according to the first invention has extremely excellent wear resistance and scuff resistance, and the material of the piston ring according to the second invention has even more Abrasion resistance and scuff resistance are further improved. In addition, all of these materials have excellent heat resistance, and piston rings made of these materials have an extremely low degree of tension loss. Therefore,
When using the piston ring according to the invention,
The durability of piston rings has been significantly improved,
The so-called open period from one overhaul of the internal combustion engine to the next overhaul is significantly extended, and the industrial value is great.
図面はいずれも本発明の実施例と示すものであ
つて、第１図は摩耗試験及びスカツフ試験に使用
した試験装置の要部を示す部分断面図、第２図は
第１図の−線に沿う矢視側面図、第３図は摩
耗試験の結果を示すグラフ、第４図はスカツフ試
験の結果を示すグラフ、第５図は張力減退試験の
結果を示すグラフ、第６図、第７図、及び第８図
はピストンリング（圧力リング）の断面図であ
る。
なお、図面に示された符号に於いて、１……ス
テータホルダ、２……円板（相手材）、３……注
油孔、４……ロータ、５……試験片保持具、６…
…試験片、７……スピンドル、８……ロードセ
ル、９……動歪計、１０……記録計、１１……母
材、１２ａ，１２ｂ，１２ｃ……窒化層である。
The drawings all show examples of the present invention, and Fig. 1 is a partial cross-sectional view showing the main parts of the test equipment used in the wear test and the scuff test, and Fig. 2 is a cross-sectional view taken along the - line in Fig. 1. 3 is a graph showing the results of the abrasion test, 4 is a graph showing the results of the scathing test, 5 is a graph showing the results of the tension reduction test, 6 and 7 , and FIG. 8 are cross-sectional views of a piston ring (pressure ring). In addition, in the symbols shown in the drawings, 1... stator holder, 2... disk (mate material), 3... oiling hole, 4... rotor, 5... test piece holder, 6...
... test piece, 7 ... spindle, 8 ... load cell, 9 ... dynamic strain meter, 10 ... recorder, 11 ... base material, 12a, 12b, 12c ... nitride layer.
Claims (1)
〜1.0重量％、クロム17.0〜18.0重量％、モリブデ
ン0.8〜1.5重量％、バナジウム0.05〜0.15重量％、
残部が実質的に鉄からなるピストンリング。 ２ 炭素0.60重量％以上0.70重量％未満、珪素0.2
〜1.0重量％、クロム17.0〜18.0重量％、モリブデ
ン0.8〜1.5重量％、バナジウム0.05〜0.15重量％、
残部が実質的に鉄からなり、少なくとも外周面に
窒化層を有するピストンリング。[Scope of Claims] 1. 0.60% by weight or more and less than 0.70% by weight of carbon, 0.2% by weight of silicon
~1.0% by weight, chromium 17.0-18.0% by weight, molybdenum 0.8-1.5% by weight, vanadium 0.05-0.15% by weight,
A piston ring with the remainder essentially made of iron. 2 Carbon 0.60% by weight or more and less than 0.70% by weight, Silicon 0.2%
~1.0% by weight, chromium 17.0-18.0% by weight, molybdenum 0.8-1.5% by weight, vanadium 0.05-0.15% by weight,
A piston ring, the remainder of which is substantially made of iron, and which has a nitrided layer on at least its outer peripheral surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26798084A JPS61144470A (en) | 1984-12-19 | 1984-12-19 | Piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26798084A JPS61144470A (en) | 1984-12-19 | 1984-12-19 | Piston ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61144470A JPS61144470A (en) | 1986-07-02 |
| JPH0239584B2 true JPH0239584B2 (en) | 1990-09-06 |
Family
ID=17452238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26798084A Granted JPS61144470A (en) | 1984-12-19 | 1984-12-19 | Piston ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61144470A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62294152A (en) * | 1986-06-12 | 1987-12-21 | Hitachi Metals Ltd | Wear resistant member |
| US4985092A (en) * | 1987-06-11 | 1991-01-15 | Aichi Steel Works, Limited | Steel having good wear resistance |
| JP2552509B2 (en) * | 1987-10-31 | 1996-11-13 | 愛知製鋼株式会社 | Steel for piston rings |
| JPH01182668A (en) * | 1988-01-15 | 1989-07-20 | Riken Corp | Piston ring |
| JPH11264468A (en) * | 1998-03-17 | 1999-09-28 | Nippon Piston Ring Co Ltd | Piston ring and its combination |
| JP4724275B2 (en) * | 2000-07-17 | 2011-07-13 | 株式会社リケン | Piston ring excellent in scuffing resistance, cracking resistance and fatigue resistance, and manufacturing method thereof |
| CN109182696B (en) * | 2018-11-21 | 2021-11-05 | 中国航发哈尔滨东安发动机有限公司 | Nitriding surface modification method for third-generation carburized steel material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5983750A (en) * | 1982-11-02 | 1984-05-15 | Nippon Piston Ring Co Ltd | Vane for rotary type fluid compressor |
-
1984
- 1984-12-19 JP JP26798084A patent/JPS61144470A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5983750A (en) * | 1982-11-02 | 1984-05-15 | Nippon Piston Ring Co Ltd | Vane for rotary type fluid compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61144470A (en) | 1986-07-02 |
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