JPH03173747A - Grease prelubricated bearing - Google Patents
Grease prelubricated bearingInfo
- Publication number
- JPH03173747A JPH03173747A JP31232889A JP31232889A JPH03173747A JP H03173747 A JPH03173747 A JP H03173747A JP 31232889 A JP31232889 A JP 31232889A JP 31232889 A JP31232889 A JP 31232889A JP H03173747 A JPH03173747 A JP H03173747A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- grease
- stainless steel
- steel
- martensitic stainless
- 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
- 239000004519 grease Substances 0.000 title claims abstract description 13
- 229910001105 martensitic stainless steel Inorganic materials 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 239000010935 stainless steel Substances 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000734 martensite Inorganic materials 0.000 claims abstract 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 7
- 239000001257 hydrogen Substances 0.000 abstract description 7
- 238000004904 shortening Methods 0.000 abstract 2
- 238000005096 rolling process Methods 0.000 abstract 1
- 230000002159 abnormal effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical group [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 101150065537 SUS4 gene Proteins 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- Rolling Contact Bearings (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、自動車電装部品（オルタネータ、電磁クラッ
チ、アイドラプーリー等）及びその他の補機部品用のグ
リース封入軸受に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a grease-filled bearing for automotive electrical components (alternators, electromagnetic clutches, idler pulleys, etc.) and other auxiliary components.
（従来の技術）
近時、自動車用電装部品等は、省資源・省エネルギー指
向５部品のコンパクト化の為、小型化・軽量化が一層進
められている。加えて高出力の要求が益々高まっており
、小型化による出力低下分は高速化することで補われて
いる。この高速化の手段としては、上記オルタネータや
電磁クラッチを例に採れば、プーリーを出来るだけ小型
化すること、及び伝達効率の低下を防ぐ為プーリーに伝
導ベルトの係合溝を多数連成し、更にベルトのテンショ
ン力を高くとる手段が採用されている。その為プーリー
を支持する軸受には高速回転と高荷重とが共に加わるこ
とになる。(Prior Art) In recent years, electrical components for automobiles are becoming more compact and lightweight in order to make five components more compact and oriented toward resource and energy conservation. In addition, the demand for high output is increasing, and the reduction in output due to miniaturization is being compensated for by increasing speed. Taking the above-mentioned alternator and electromagnetic clutch as an example, the means to increase this speed is to make the pulley as small as possible, and to prevent a drop in transmission efficiency, the pulley is connected with a large number of engagement grooves for the transmission belt. Furthermore, a means for increasing the tension of the belt is adopted. Therefore, both high-speed rotation and high loads are applied to the bearings that support the pulley.
（発明が解決しようとする課題）
上記のような高速化・高荷重化に伴ない、転走面に生じ
る剥離（フレーキング）によってこれら軸受が早期に寿
命に至る事例が数多く報告されるようになった。この早
期寿命を引き起こす剥離は、金属疲労により生じる通常
の転走面表面ないし表層の剥離とは違い、相当内部の深
い部分から突然に生じる特異な破壊現象を示しており、
この異常剥離から生じる軸受寿命は、通常のグリース封
入軸受の計算寿命に比べて短寿命を示す。(Problem to be Solved by the Invention) As speeds and loads increase as mentioned above, many cases have been reported in which these bearings end their lifespan prematurely due to flaking that occurs on the raceway surfaces. became. This peeling that causes premature life is different from the normal peeling of the raceway surface or surface layer caused by metal fatigue, and shows a unique fracture phenomenon that suddenly occurs from a considerably deep part of the interior.
The bearing life resulting from this abnormal peeling is shorter than the calculated life of a normal grease-filled bearing.
本発明者等は、上記異常剥離の原因について鋭意探求し
た結果、特願平１−６５５７号で報告した通り、高速化
による振動が転走面の鏡面摩耗を引き起こし、それによ
る新生面の形成が触媒作用となってグリースが分解し、
その際に発生した水素が鋼中に侵入し、水素脆性による
剥離が原因となって短寿命となることを知見した。As a result of intensive investigation into the cause of the above-mentioned abnormal peeling, the present inventors found that as reported in Japanese Patent Application No. 1-6557, vibrations due to high speed cause mirror wear of the raceway surface, and the formation of a new surface due to this causes catalysis. As a result, the grease decomposes,
It was discovered that the hydrogen generated at that time penetrated into the steel, causing peeling due to hydrogen embrittlement, resulting in a short life.
而して、上記先行出願では、異常剥離の発生を防止する
為、転走面に酸化皮膜を形成するようにした。この酸化
皮膜の形成は転走面を不働態化する手段の一つであるが
、本発明者は更にその后の実験・研究によって、軸受の
内輪もしくは外輪のうち少なくとも固定側の材質として
、不働態化表面を有するものを用いることによって、多
少の表面硬度の低下にも拘らず軸受寿命が長寿命となる
ことを知見し、こぎに水素脆性を材料面より改善した発
明を提供せんとするものである。In the above-mentioned prior application, an oxide film was formed on the raceway surface in order to prevent the occurrence of abnormal peeling. Formation of this oxide film is one of the means to passivate the raceway surface, but through subsequent experiments and research, the inventors have determined that the material of at least the stationary side of the inner ring or outer ring of the bearing should be made of an inert material. It is an object of this invention to provide an invention in which hydrogen embrittlement is improved from the material aspect of a saw by finding that by using a bearing having a working surface, the life of the bearing can be extended despite a slight decrease in surface hardness. It is.
（課題を解決するための手段）
上記課題を解決する本発明のグリース封入軸受は、軸受
の内輪もしくは外輪のうち少なくとも固定側の軌道輪を
マルテンサイト系ステンレス鋼として成る。望ましい実
施例に於て、マルテンサイト系ステンレス鋼は焼戻しマ
ルテンサイトの組織を有する１３Ｃｒ−０，３Ｃ鋼（Ｓ
ＵＳ４２０Ｊ２相当）、もしくは１３％ないし１８％Ｃ
ｒ系の高炭素ステンレス鋼である。(Means for Solving the Problems) A grease-filled bearing of the present invention that solves the above problems is made of martensitic stainless steel at least on the stationary side of the inner ring or outer ring of the bearing. In a preferred embodiment, the martensitic stainless steel is 13Cr-0,3C steel (S
US420J2 equivalent) or 13% to 18%C
It is R-based high carbon stainless steel.
（作用及び実施例）
グリース封入軸受の固定側軸（内軸もしくは外輪）の転
走面に生ずる既述異常剥離（水素脆性に基因するものと
考えられる）をなくするために、不働態化表面を有する
金属材料として、マルテンサイト系ステンレス鋼を用い
た実施例を、硬度及び軸受寿命ともども表１に示す。な
お、試験条件は自動車電装部品の一つであるオルタネー
タの前側の軸受の外輪（固定側）として用い、使用温度
６０〜８０℃、回転数１５ 、５００ｒ、ｐ、ｍの下で
テストし、テスト軸受１０ケの平均値を表示したもので
ある。なお、比較のため従来の高炭素クロム軸受鋼（Ｓ
ＵＪ２）のテスト結果も併記した。(Operation and Examples) In order to eliminate the above-mentioned abnormal peeling (possibly caused by hydrogen embrittlement) that occurs on the raceway surface of the stationary shaft (inner shaft or outer ring) of a grease-filled bearing, the passivated surface Table 1 shows examples using martensitic stainless steel as the metal material having hardness and bearing life. The test conditions were as follows: The outer ring (fixed side) of the front bearing of an alternator, which is one of the automotive electrical components, was used at an operating temperature of 60 to 80°C and a rotation speed of 15, 500 r, p, m. The average value of 10 bearings is displayed. For comparison, conventional high carbon chromium bearing steel (S
The test results for UJ2) are also listed.
（表１）
表１から明らかなようにマルテンサイト系ステンレス鋼
を用いた場合、通常のＳＵＪ ２製軸受に較べて著しく
長寿命を示す。この比較に於て特記されるのは、ＳＵＪ
２に較べて硬度が相応に低い（ＨＲＣ５２）ＳＵＳ４
２０Ｊ２のものが、硬度からの予想とは裏腹に、寿命が
著しく向上していることである。ＳＵＪ ２にぼり近い
硬度の１３％Ｃｒ−０，７％Ｃ＠、５ＵＳ４４０Ｃにし
ても寿命は５ＵＳ４２０Ｊ２と同等に改善されている。(Table 1) As is clear from Table 1, when martensitic stainless steel is used, the life is significantly longer than that of ordinary SUJ 2 bearings. Of particular note in this comparison is SUJ
Hardness is correspondingly lower than 2 (HRC52) SUS4
20J2 has a significantly improved lifespan, contrary to expectations based on its hardness. Even with 13%Cr-0.7%C@, 5US440C, which has a hardness close to SUJ 2, the life is improved to the same level as 5US420J2.
この結果から寿命は硬さに依存すると云う従来の経験的
判断は成り立たず、中炭素のマルテンサイト系ステンレ
ス鋼が意外な寿命成果を示していることが判る。なお、
本発明は外輪を固定側とするグリース封入軸受の場合は
外輪に上記ステンレス鋼を最低用いるものとする。但し
、内外両輪を同ステンレス鋼製とすることも妨げない。These results show that the conventional empirical judgment that life depends on hardness does not hold true, and that medium carbon martensitic stainless steel shows unexpected longevity results. In addition,
In the case of a grease-filled bearing in which the outer ring is the stationary side, the present invention uses at least the above stainless steel for the outer ring. However, this does not prevent both the inner and outer wheels from being made of the same stainless steel.
（発明の効果）
叙述した所から、本発明によれば自動車電装部品に於け
るグリース封入軸受に於て、従来の高炭素クロム軸受鋼
に代って、マルテンサイト系ステンレス鋼を少なくとも
固定側の外輪もしくは内輪に用いることによって、軸受
寿命を改善出来るので、先願の酸化皮膜処理と同様、水
素脆性に対する抗性を高め、もって軸受適性の増大に寄
与し得ると共に、中炭素領域のマルテンサイト系ステン
レス鋼を用いることにより高炭素クロム軸受鋼に較べて
さほどコスト高にならないと云う効果を併せ備えたもの
である。(Effects of the Invention) According to the present invention, martensitic stainless steel is used at least on the fixed side in place of conventional high carbon chromium bearing steel in grease-filled bearings for automotive electrical components. By applying it to the outer ring or inner ring, the life of the bearing can be improved.Similar to the oxide film treatment in the previous application, it can increase the resistance to hydrogen embrittlement and thereby contribute to increased suitability for bearings. The use of stainless steel also has the advantage that the cost is not so high compared to high carbon chromium bearing steel.
一以上一one or more one
Claims (1)
の軌道輪をマルテンサイト系ステンレス鋼として成るグ
リース封入軸受。 ２、マルテンサイト系ステンレス鋼が焼戻しマルテンサ
イトの組織を有する１３Ｃｒ−０．３Ｃ鋼である請求項
１記載のグリース封入軸受。 ３、マルテンサイト系ステンレス鋼が１３％Ｃｒ及び１
８％Ｃｒ系の高炭素ステンレス鋼である請求項１記載の
グリース封入軸受。[Scope of Claims] 1. A grease-filled bearing in which at least the stationary ring of the inner ring or outer ring of the bearing is made of martensitic stainless steel. 2. The grease-filled bearing according to claim 1, wherein the martensitic stainless steel is 13Cr-0.3C steel having a tempered martensite structure. 3. Martensitic stainless steel contains 13% Cr and 1
The grease-filled bearing according to claim 1, which is made of 8% Cr-based high carbon stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31232889A JPH03173747A (en) | 1989-11-30 | 1989-11-30 | Grease prelubricated bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31232889A JPH03173747A (en) | 1989-11-30 | 1989-11-30 | Grease prelubricated bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03173747A true JPH03173747A (en) | 1991-07-29 |
Family
ID=18027914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31232889A Pending JPH03173747A (en) | 1989-11-30 | 1989-11-30 | Grease prelubricated bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03173747A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6086686A (en) * | 1997-04-16 | 2000-07-11 | Nsk Ltd. | Rolling member |
| EP1123986A1 (en) | 2000-02-10 | 2001-08-16 | Nsk Ltd | Rolling bearing |
| US6565677B1 (en) | 1999-05-20 | 2003-05-20 | Nsk Ltd. | Rolling bearing |
| DE10012350C2 (en) * | 1999-03-19 | 2003-12-11 | Nsk Ltd | roller bearing |
| GB2399147A (en) * | 2003-02-20 | 2004-09-08 | Skf Ab | Fire safe bearings |
-
1989
- 1989-11-30 JP JP31232889A patent/JPH03173747A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6086686A (en) * | 1997-04-16 | 2000-07-11 | Nsk Ltd. | Rolling member |
| US6228184B1 (en) | 1997-04-16 | 2001-05-08 | Nsk Ltd. | Rolling member |
| US6358333B1 (en) | 1997-04-16 | 2002-03-19 | Nsk Ltd. | Rolling member |
| DE10012350C2 (en) * | 1999-03-19 | 2003-12-11 | Nsk Ltd | roller bearing |
| US6565677B1 (en) | 1999-05-20 | 2003-05-20 | Nsk Ltd. | Rolling bearing |
| DE10024538B4 (en) * | 1999-05-20 | 2004-10-28 | Nsk Ltd. | roller bearing |
| EP1123986A1 (en) | 2000-02-10 | 2001-08-16 | Nsk Ltd | Rolling bearing |
| US6602360B2 (en) | 2000-02-10 | 2003-08-05 | Nsk Ltd. | Rolling bearing |
| GB2399147A (en) * | 2003-02-20 | 2004-09-08 | Skf Ab | Fire safe bearings |
| GB2399147B (en) * | 2003-02-20 | 2006-02-08 | Skf Ab | Fire safe bearings |
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