JPS6323239B2 - - Google Patents
Info
- Publication number
- JPS6323239B2 JPS6323239B2 JP54045681A JP4568179A JPS6323239B2 JP S6323239 B2 JPS6323239 B2 JP S6323239B2 JP 54045681 A JP54045681 A JP 54045681A JP 4568179 A JP4568179 A JP 4568179A JP S6323239 B2 JPS6323239 B2 JP S6323239B2
- Authority
- JP
- Japan
- Prior art keywords
- molecular weight
- weight polyethylene
- grease
- ultra
- lubricating
- 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
Links
- 239000000203 mixture Substances 0.000 claims description 64
- 239000004519 grease Substances 0.000 claims description 50
- 230000001050 lubricating effect Effects 0.000 claims description 45
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 33
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 33
- -1 polyethylene Polymers 0.000 claims description 18
- 239000004698 Polyethylene Substances 0.000 claims description 13
- 229920000573 polyethylene Polymers 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 3
- 239000000344 soap Substances 0.000 description 34
- 239000003921 oil Substances 0.000 description 20
- 239000002480 mineral oil Substances 0.000 description 17
- 235000010446 mineral oil Nutrition 0.000 description 17
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 15
- 229910052744 lithium Inorganic materials 0.000 description 15
- 150000005690 diesters Chemical class 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 10
- 238000000926 separation method Methods 0.000 description 8
- 239000010687 lubricating oil Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 239000000314 lubricant Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 229920005862 polyol Polymers 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Landscapes
- Rolling Contact Bearings (AREA)
- Lubricants (AREA)
Description
本発明は、軸受用潤滑組成物に係り、特に、超
高分子量ポリエチレン（平均分子量１×106〜５
×106）、或は低分子量ポリエチレン（平均分子量
２×103〜１×105）と潤滑グリースとの混合物を
使用した転がり軸受用潤滑組成物に関するもので
ある。
一般に転がり軸受の潤滑には、半固体状のグリ
ースが使用されている。しかしながら、このグリ
ース潤滑では、軸受回転中のグリースの流動性の
ため必ずシール板等の密封装置で密封しておく必
要があつた。このため巾寸法の小さい特殊軸受に
は、このグリース潤滑方式が採用できなかつた。
更に、軸受自体が遠心運動しながら使用される撚
線機においては、軸受内のグリースが遠心力の作
用によつて飛散し、短期間に焼き付き取り換えを
余儀なくされていた。
そこで、シール板等を不要とするため、又、軸
受自体の遠心運動によつて潤滑剤が飛散しないた
めの潤滑組成物、即ち、例えば超高分子量ポリエ
チレンと鉱油等の潤滑油を混合して得られる液
状・半個体状の混合物を、軸受空間に充填した
後、軸受と共に加熱処理すると固化する潤滑組成
物が開発され、上記特殊軸受には一応その成果を
挙げていた。
しかし、この上記の潤滑組成物でも、その加熱
処理前は全体或は潤滑油だけが自然流動する。従
つて、現実に軸受に適用する場合、硬化するまで
混合物を軸受の内・外輪間の内部空間に人為的に
保持しておく必要があり、金属性の蓋等で流出防
止をしている。それゆえに加熱前に蓋等の使用が
不可能な軸受には上記潤滑剤は適用できなかつ
た。また流動性が良いので、自然に軸受内部空間
一杯に充填されてしまい、部分的充填が不可能で
あつた。その結果、軸受トルクが増大し、特に軸
受雰囲気の温度が低下すると、軸受トルクの増大
が著しいものとなつていた。更に潤滑油にジエス
テル等の合成油を用いると加熱時に離油、即ち油
のにじみ出が著しいなどの弊害が残されていた。
本発明は、上記従来の問題点に鑑み開発したも
ので、加熱処理又は処理中でも自然流動すること
なく所期の位置に的確に保持され、作業性の良好
なことに加えて、保油力が強くて対象軸受の自己
潤滑性を長期にわたつて保証しうる軸受用潤滑組
成物を提供せんとするものである。超高分子量ポ
リエチレン、即ちその平均分子量が１×106以上
５×106の範囲にある超高分子量ポリエチレンと
グリースのような潤滑剤とからなる潤滑組成物に
おいて超高分子量ポリエチレンの含量が多い程、
その潤滑組成物は堅さが大となる。このように、
超高分子量ポリエチレンの特定された分子量及び
それが組成物中に含まれる特定含有量に応じて、
その組成物の物理的特性は変化し、グリースのよ
うなゼリー状の軟性ゲルから、固体として作用す
る堅い丈夫な剛性ゲルまでの範囲がある。組成物
は、使用に際し、軸受の潤滑剤として、軸受に対
して連続的に且つ除々に油を放出し、軸受に長時
間耐久力のある自己潤滑性を与えるものである。
潤滑組成物中に用いられる超高分子量ポリエチ
レンの量は、組成物の所望の離油度、粘り強さ、
及び堅さに依存するものである。上述したよう
に、超高分子量ポリエチレンの量が多ければ多い
程、ゲルの堅さが大きくなる。
本発明は上記超高分子量ポリエチレンの代り
に、低分子量ポリエチレン（平均分子量２×103
〜１×105）を使用してもゲル組成物が得られる。
ところで上記の低分子量ポリエチレンを用いたゲ
ル組成物は、ゲルの剛性及び保油性において超高
分子量ポリエチレンのそれより若干劣る。この相
違はポリエチレンの分子量に依存する。更に超高
分子量ポリエチレンは流動性に乏しく、メルトイ
ンデツクスは0.01〜0.00である。このように超高
分子量ポリエチレンは高温に加熱してもほとんど
流動することがない。又、超高分子量ポリエチレ
ンの機械的特性は、低分子量ポリエチレンのそれ
と比べると優れている。このような特性をもつ超
高分子量ポリエチレンから作つた潤滑ゲルは強固
で流動性のないものとなる。
本発明の潤滑ゲル組成物をつくる方法は、超高
分子量ポリエチレンの粉末（メツシユ60〜150：
この粒度は小さい方が軸受への影響が少なく良好
である。）と石鹸又は非石鹸増稠の潤滑グリー
ス；リチウム石鹸ジエステル系グリース、リチウ
チ石鹸鉱油系グリース、ナイトリウム石鹸鉱油系
グリース、アルミニウム石鹸鉱油系グリース、リ
チウム石鹸ジエステル鉱油系グリース、非石鹸ジ
エステル系グリース、非石鹸鉱油系グリース、非
石鹸ポリオールエステル系グリース、リチウム石
鹸ポリオールエステル系グリース等から選ばれた
もの；とを常温で均質になるように混合し、この
混合物を、混合したままの状態で超高分子量ポリ
エチレンが融解をおこすに十分に高い温度150℃
〜200℃で加熱し、冷却すると、均質な本発明の
潤滑組成物を形成する。
また、潤滑組成物から油がにじみ出るのを出来
る丈遅く少なくするために、常温で固形の潤滑剤
即ちワツクス、及びそれらと潤滑油の常温で固形
の配合物（商品名PlasticE等）を含ませると目的
を達しうる。この固形のワツクス及び配合物の含
量が多い程、離油率も抑制出来、油がにじみ出る
のがにぶくなる。
以下本発明の構成を添付図面と実施例に従つて
説明すると次の通りである。
第１図は、本発明に係る潤滑組成物を適用した
転がり軸受の構造例を示す図面である。図面にお
いて、１は外輪、２は内輪、３はボール、４は潤
滑組成物である。而して、潤滑組成物４は、超高
分子量ポリエチレン１〜95wt％と、石鹸又は非
石鹸増稠剤の潤滑グリース99〜5wt％とを混合
し、この混合物を150℃〜200℃で加熱し、固形化
したものである。望ましくは、超高分子量ポリエ
チレン10〜30wt％と潤滑グリース90〜70wt％と
を混合した潤滑組成物である。
次に本発明の実施例を示す。
実施例 １
平均分子量24000の低分子量ポリエチレン粉末
2.5grとリチウム石鹸ジエステル系グリース7.5gr
との混合物を150〜155℃、30分加熱すると多孔質
の圧縮強度３Kg／cm2の塊となつた。
実施例 ２
平均分子量24000の低分子量ポリエチレン粉末
2.5grとリチウム石鹸鉱油系グリース7.5grとの混
合物を150〜155℃・30分加熱するとロウ状の硬い
塊になつた。
実施例 ３
三井石油化学社製超高分子量ポリエチレン商品
名〃ハイゼツクスミリオン〃（平均分子量１〜３
×106）粉末5grと下記の潤滑グリース15grとの混
合物を160〜180℃・30分加熱すると弾力性に富む
圧縮強度20〜40Kg／cm2の塊になつた。この圧縮強
度は潤滑グリースによつて差があり、下記のａ、
ｂのグリースを使用すると圧縮強度は略40Kg／cm2
と大きく、下記のｄ、ｅのグリースを使用すると
圧縮強度は略20Kg／cm2と小さい。ａ：リチウム石
鹸鉱油系グリース，ｂ：ナトリウム石鹸鉱油系グ
リース，ｃ：アルミニウム石鹸鉱油系グリース，
ｄ：リチウム石鹸ジエステル系グリース，ｅ：リ
チウム石鹸ジエステル鉱油系グリース，ｆ：非石
鹸ジエステル系グリース。
実施例 ４
三井石油化学社製超高分子量ポリエチレン商品
名〃ハイゼツクスミリオン〃（平均分子量１〜３
×106）粉末2grと下記グリース18grとの混合物を
160〜180℃30分加熱すると実施例−３に比べ若干
軟らかい圧縮強度５〜15Kg／cm2の固形物になつ
た。ａ：リチウム石鹸鉱油系グリース・ｂ：ナト
リウム石鹸鉱油系グリース・ｃ：アルミニウム石
鹸鉱油系グリース・ｄ：リチウム石鹸ジエステル
系グリース・ｅ：リチウム石鹸ジエステル鉱油系
グリース・ｆ：非石鹸ジエステル系グリース。
実施例 ５
三井石油化学社製超高分子量ポリエチレン商品
名〃ハイゼツクスミリオン〃（平均分子量１〜３
×106）粉末0.1grとリチウム石鹸鉱油系グリース
9.9grとの混合物を160〜180℃・30分加熱すると
軟かい弾性力のあるゼリー状の固形物になつた。
実施例 ６
ヘキスト社製超高分子量ポリエチレン商品名〃
ホスタレンGUR〃（平均分子量１〜４×106）
25wt％とリチウム石鹸ポリオールエステル系グ
リース40wt％と添加物として商品名〃Plastic Ｅ
〃35wt％との混合物を160〜180℃で加熱すると
弾力性に富む塊で、20Kg／cm2の荷重まで耐えられ
るものが得られた。
実施例 ７
ヘキスト社製超高分子量ポリエチレン商品名〃
ホスタレンGUR〃（平均分子量１〜４×106）
20wt％とリチウム石鹸系鉱油系グリース65wt％
と添加物として商品名〃Plastic Ｅ〃15wt％との
混合物を160〜180℃で加熱すると実施例−６より
も剛性のある塊で40Kg／cm2の荷重まで耐えられる
ものが得られた。
実施例 ８
実施例−３の組成の実施例品を内輪内径17mmの
深溝玉軸受の外輪と内輪との間の内部空間部に充
填し、160〜180℃・30分加熱したものの摩擦トル
ク（起動及び運転）は第２図及び第３図に示す通
りで、グリース潤滑及び従来のゲル組成物に比べ
トルクが著しく小さい。又、温度によるトルク変
動は殆んどない。
実施例−１及び２のように低分子量ポリエチレ
ンと潤滑グリースとからなる潤滑組成物Ａと、実
施例−３乃至８のように超高分子量ポリエチレン
と潤滑グリースとからなる潤滑組成物Ｂとを比較
してみると、共にゲル状の塊が生成するが組成物
Ａは組成物Ｂに比べ脆く、これら組成物Ａ及びＢ
を軸受空間に充填して、軸受自体を遠心運動させ
ると、遠心力約1000Gで組成物Ａは飛散したが、
組成物Ｂは遠心力が約3000Gでも飛散しないとい
う相違があつた。
Ｇ＝重力加速度＝980cm／sec2
以上、説明したように、本発明は、平均分子量
１×106〜５×106の超高分子量ポリエチレン、或
は平均分子量２×103〜１×106の低分子量ポリエ
チレン１〜95wt％と、石鹸又は非石鹸増稠の潤
滑グリース99〜5wt％との混合物を温度150〜200
℃で加熱して固形化させたことを内容とする転が
り軸受用潤滑組成物に係り、従来の潤滑組成物と
違つて、熱処理前の混合物は、使用グリースの滴
点以下では自然流動せずグリース状をしているの
で取扱いが容易で、加熱処理後の固形物は適度の
潤滑剤を転走面に供給し、軸受の潤滑に適し、極
めて実用上の効果が著しい。離油率について従来
例と比較して既述したように、本発明の軸受用潤
滑組成物は保油力が強く、したがつて油のにじみ
出しが除々にかつ安定的におこなわれ、対象軸受
の自己潤滑性を長期にわたつて保証することがで
きる。この効果は油のにじみ出しを抑制するため
の添加剤を加えることによつて一層増長され、運
転中に作用する遠心力に対しても良く耐えて離油
率を低く抑えることができる。又本発明の潤滑組
成物は軸受空間内に充填した後に加熱して固形化
しても良く、先に加熱処理して、完全に所定形状
に固形化した後に軸受空間に充填しても良いこと
は勿論である。更に超高分子量ポリエチレンの含
量が50wt％以上の組成物は、軸受材料として、
特に保持器として使用することができる。
尚、参考までに第４図において、実施例−６は
潤滑組成物の本発明品と、それと同一組成分で、
グリース状でない潤滑油と石鹸及び超高分子量ポ
リエチレンとからなる潤滑組成物の従来品とに遠
心力5700Gを負荷した場合の離油率を示す。これ
により本発明は従来品よりも20％程保油性が良い
ことがわかる。また、実施例−３及び４の潤滑組
成物の本発明品とそれと同一組成分で潤滑油例え
ばジエステル油と超高分子量ポリエチレンとから
なる潤滑組成物の従来品との加熱16時間後の離油
率を下表に示す。これにより、従来品は離油が多
いことがわかる。
The present invention relates to a lubricating composition for bearings, particularly ultra-high molecular weight polyethylene (average molecular weight 1×10 6 to 5
The present invention relates to a lubricating composition for rolling bearings using a mixture of low molecular weight polyethylene (average molecular weight 2×10 3 to 1×10 5 ) and lubricating grease. Semi-solid grease is generally used to lubricate rolling bearings. However, with this grease lubrication, due to the fluidity of the grease during rotation of the bearing, it is necessary to always seal the bearing with a sealing device such as a seal plate. For this reason, this grease lubrication method could not be used for special bearings with small width dimensions.
Furthermore, in wire twisting machines in which the bearing itself is used while undergoing centrifugal movement, the grease within the bearing is scattered by the action of centrifugal force, and the bearing seizes up in a short period of time, necessitating replacement. Therefore, in order to eliminate the need for a seal plate, etc., and to prevent the lubricant from scattering due to the centrifugal movement of the bearing itself, a lubricating composition is prepared, for example, by mixing ultra-high molecular weight polyethylene with a lubricating oil such as mineral oil. A lubricating composition has been developed that solidifies when a liquid/semi-solid mixture is filled into the bearing space and then heat-treated together with the bearing. However, even in the above-mentioned lubricating composition, the whole or only the lubricating oil flows naturally before the heat treatment. Therefore, when actually applied to bearings, it is necessary to artificially hold the mixture in the internal space between the inner and outer rings of the bearing until it hardens, and to prevent it from flowing out using a metal lid or the like. Therefore, the above-mentioned lubricant cannot be applied to bearings for which it is impossible to use a lid or the like before heating. Furthermore, since it has good fluidity, it naturally fills the inner space of the bearing, making partial filling impossible. As a result, the bearing torque increases, and especially when the temperature of the bearing atmosphere decreases, the increase in the bearing torque becomes significant. Furthermore, when synthetic oils such as diesters are used as lubricating oils, there remain disadvantages such as oil separation, that is, significant oil oozing during heating. The present invention was developed in view of the above-mentioned conventional problems.In addition to being accurately held in the desired position without spontaneous flow during heat treatment or processing, and having good workability, it also has oil retention ability. The object of the present invention is to provide a lubricating composition for a bearing that is strong and can guarantee the self-lubricating properties of the target bearing over a long period of time. In a lubricating composition consisting of ultra-high molecular weight polyethylene, that is, ultra-high molecular weight polyethylene whose average molecular weight is in the range of 1 x 10 6 or more and 5 x 10 6 and a lubricant such as grease, the higher the content of ultra-high molecular weight polyethylene, the higher the content of ultra-high molecular weight polyethylene. ,
The lubricating composition has a high stiffness. in this way,
Depending on the specified molecular weight of the ultra-high molecular weight polyethylene and the specified content thereof in the composition,
The physical properties of the composition vary, ranging from a grease-like, jelly-like, soft gel to a hard, tough, rigid gel that behaves as a solid. In use, the composition acts as a bearing lubricant, continuously and gradually releasing oil to the bearing, giving the bearing long-lasting self-lubricating properties. The amount of ultra-high molecular weight polyethylene used in the lubricating composition depends on the desired oil separation, tenacity,
and hardness. As mentioned above, the greater the amount of ultra-high molecular weight polyethylene, the greater the stiffness of the gel. The present invention uses low molecular weight polyethylene (average molecular weight 2×10 3
~1×10 5 ) can also be used to obtain a gel composition.
By the way, the gel composition using the above-mentioned low molecular weight polyethylene is slightly inferior to that of ultra-high molecular weight polyethylene in terms of gel rigidity and oil retention. This difference depends on the molecular weight of the polyethylene. Furthermore, ultra-high molecular weight polyethylene has poor fluidity, with a melt index of 0.01 to 0.00. In this way, ultra-high molecular weight polyethylene hardly flows even when heated to high temperatures. Further, the mechanical properties of ultra-high molecular weight polyethylene are superior to those of low molecular weight polyethylene. A lubricating gel made from ultra-high molecular weight polyethylene with such characteristics is strong and non-fluid. The method for producing the lubricating gel composition of the present invention includes ultra-high molecular weight polyethylene powder (mesh 60-150:
The smaller the particle size, the less influence it has on the bearing and is better. ) and soap or non-soap thickened lubricating grease; lithium soap diester grease, lithium soap mineral oil grease, nitrium soap mineral oil grease, aluminum soap mineral oil grease, lithium soap diester mineral oil grease, non-soap diester grease, a non-soap mineral oil grease, a non-soap polyol ester grease, a lithium soap polyol ester grease, etc., are mixed homogeneously at room temperature, and this mixture is heated to an ultrahigh Temperature 150°C high enough to cause melting of molecular weight polyethylene
Heating at ~200°C and cooling forms a homogeneous lubricating composition of the invention. In addition, in order to slow down and reduce the oozing of oil from the lubricating composition, it is recommended to include a lubricant, that is, wax, which is solid at room temperature, and a mixture of these and lubricating oil, which is solid at room temperature (trade name: PlasticE, etc.). The goal can be achieved. The higher the content of this solid wax and compound, the more the oil separation rate can be suppressed and the oil will ooze out more slowly. The structure of the present invention will be described below with reference to the accompanying drawings and embodiments. FIG. 1 is a drawing showing an example of the structure of a rolling bearing to which a lubricating composition according to the present invention is applied. In the drawings, 1 is an outer ring, 2 is an inner ring, 3 is a ball, and 4 is a lubricating composition. Lubricating composition 4 is prepared by mixing 1 to 95 wt% of ultra-high molecular weight polyethylene and 99 to 5 wt% of lubricating grease of soap or non-soap thickener, and heating this mixture at 150 to 200 °C. , solidified. Desirably, the lubricating composition is a mixture of 10 to 30 wt% of ultra-high molecular weight polyethylene and 90 to 70 wt% of lubricating grease. Next, examples of the present invention will be shown. Example 1 Low molecular weight polyethylene powder with an average molecular weight of 24000
2.5gr and lithium soap diester grease 7.5gr
When the mixture was heated at 150-155°C for 30 minutes, it became a porous mass with a compressive strength of 3 kg/cm 2 . Example 2 Low molecular weight polyethylene powder with an average molecular weight of 24000
When a mixture of 2.5gr and 7.5gr of lithium soap mineral oil grease was heated at 150-155℃ for 30 minutes, it became a waxy hard lump. Example 3 Ultra-high molecular weight polyethylene manufactured by Mitsui Petrochemical Co., Ltd. Product name: Hi-Zex Million (average molecular weight 1 to 3
×10 6 ) When a mixture of 5 gr of powder and 15 gr of the following lubricating grease was heated at 160-180°C for 30 minutes, it became a highly elastic mass with a compressive strength of 20-40 Kg/cm 2 . This compressive strength varies depending on the lubricating grease, and is as follows:
When using grease b, the compressive strength is approximately 40Kg/cm 2
However, when using greases d and e below, the compressive strength is as low as approximately 20 kg/cm 2 . a: Lithium soap mineral oil based grease, b: Sodium soap mineral oil based grease, c: Aluminum soap mineral oil based grease,
d: Lithium soap diester grease, e: Lithium soap diester mineral oil grease, f: Non-soap diester grease. Example 4 Ultra-high molecular weight polyethylene manufactured by Mitsui Petrochemical Co., Ltd. Product name: Hi-Zex Million (average molecular weight 1 to 3
×10 6 ) Mixture of 2gr powder and 18gr of the following grease.
When heated for 30 minutes at 160-180°C, it became a solid material with a compressive strength of 5-15 Kg/cm 2 which was slightly softer than that of Example-3. a: Lithium soap mineral oil based grease; b: Sodium soap mineral oil based grease; c: Aluminum soap mineral oil based grease; d: Lithium soap diester based grease; e: Lithium soap diester mineral oil based grease; f: non-soap diester based grease. Example 5 Ultra-high molecular weight polyethylene manufactured by Mitsui Petrochemical Co., Ltd. Product name: Hi-Zex Million (average molecular weight 1 to 3
x10 6 ) Powder 0.1gr and lithium soap mineral oil based grease
When the mixture with 9.9gr was heated at 160-180℃ for 30 minutes, it became a soft and elastic jelly-like solid. Example 6 Ultra-high molecular weight polyethylene product name manufactured by Hoechst
Hostalene GUR (average molecular weight 1-4×10 6 )
25wt% and lithium soap polyol ester grease 40wt% and additives Product name: Plastic E
When a mixture with 35 wt% was heated at 160-180°C, a highly elastic mass that could withstand a load of 20 kg/cm 2 was obtained. Example 7 Ultra-high molecular weight polyethylene product name manufactured by Hoechst
Hostalene GUR (average molecular weight 1-4×10 6 )
20wt% and lithium soap mineral oil based grease 65wt%
When a mixture of 15% by weight of Plastic E (trade name) as an additive was heated at 160 to 180°C, a mass more rigid than in Example 6 and able to withstand a load of 40 kg/cm 2 was obtained. Example 8 The example product having the composition of Example-3 was filled into the internal space between the outer ring and the inner ring of a deep groove ball bearing with an inner ring inner diameter of 17 mm, and heated at 160 to 180°C for 30 minutes. and operation) as shown in FIGS. 2 and 3, and the torque is significantly lower than that of grease lubrication and conventional gel compositions. Furthermore, there is almost no torque variation due to temperature. Comparison of lubricating composition A consisting of low molecular weight polyethylene and lubricating grease as in Examples 1 and 2 and lubricating composition B consisting of ultra high molecular weight polyethylene and lubricating grease as in Examples 3 to 8. As a result, gel-like lumps were formed in both compositions, but composition A was more brittle than composition B.
When the bearing space was filled with Composition A and the bearing itself was centrifugally moved, Composition A was scattered by a centrifugal force of about 1000G, but
Composition B differed in that it did not scatter even at a centrifugal force of about 3000 G. G = gravitational acceleration = 980 cm/sec 2 or more As explained, the present invention uses ultra-high molecular weight polyethylene with an average molecular weight of 1 x 10 6 to 5 x 10 6 or an average molecular weight of 2 x 10 3 to 1 x 10 6 A mixture of 1 to 95 wt% of low molecular weight polyethylene and 99 to 5 wt% of soap or non-soap thickened lubricating grease was heated at a temperature of 150 to 200.
Regarding the lubricating composition for rolling bearings, which is solidified by heating at ℃, unlike conventional lubricating compositions, the mixture before heat treatment does not naturally flow below the dropping point of the grease used, and the grease It is easy to handle because of its solid shape, and the solid material after heat treatment supplies an appropriate amount of lubricant to the raceway surface, making it suitable for bearing lubrication, and has an extremely significant practical effect. As already mentioned in comparison with conventional examples regarding oil separation rate, the lubricating composition for bearings of the present invention has a strong oil retaining ability, and therefore oil oozes out gradually and stably. Self-lubricating properties can be guaranteed over a long period of time. This effect can be further enhanced by adding an additive to suppress oil oozing, and it can withstand well the centrifugal force that acts during operation, keeping the oil separation rate low. Furthermore, the lubricating composition of the present invention may be filled into the bearing space and then heated to solidify it, or it may be heat-treated first and completely solidified into a predetermined shape before being filled into the bearing space. Of course. Furthermore, compositions containing ultra-high molecular weight polyethylene of 50wt% or more can be used as bearing materials.
In particular, it can be used as a cage. For reference, in Figure 4, Example 6 shows the lubricating composition of the present invention and the same composition as that of the lubricating composition of the present invention.
The oil separation rate is shown when a centrifugal force of 5700 G is applied to a non-greasy lubricating oil and a conventional lubricating composition consisting of soap and ultra-high molecular weight polyethylene. This shows that the present invention has about 20% better oil retention than the conventional product. In addition, the oil separation rates after 16 hours of heating between the lubricating compositions of the present invention in Examples 3 and 4 and the conventional lubricating compositions having the same composition but consisting of a lubricating oil such as diester oil and ultra-high molecular weight polyethylene were evaluated. Shown in the table below. This shows that the conventional product has a lot of oil separation.
【表】
であるがグリース状でなく、潤滑油と石鹸
の単なる混合物である。
[Table] However, it is not grease-like, but simply a mixture of lubricating oil and soap.
第１図は本発明に係る潤滑ゲル組成物を適用し
た転がり軸受を示す図面、第２図は本発明品と従
来品の起動トルクを示す図面、第３図は本発明と
従来品の運動トルクを示す図面、第４図は本発明
と従来品との遠心力の影響を示す図面である。
Fig. 1 is a drawing showing a rolling bearing to which the lubricating gel composition according to the present invention is applied, Fig. 2 is a drawing showing the starting torque of the inventive product and the conventional product, and Fig. 3 is the kinetic torque of the present invention and the conventional product. FIG. 4 is a drawing showing the influence of centrifugal force between the present invention and a conventional product.
Claims (1)
子量ポリエチレン95wt％〜1wt％と、 (b) 上記超高分子量ポリエチレンの融解温度より
高い滴点を有する潤滑グリース5wt％〜99wt％ とからなる混合物を上記超高分子量ポリエチレ
ンの融解温度に加熱し、しかる後冷却して固形
化した、油がにじみ出る結果として油性面を有
することを特徴とする軸受用潤滑組成物。 ２ (a) 平均分子量約１×106〜５×106の超高分
子量ポリエチレン95wt％〜1wt％と、 (b) 上記超高分子量ポリエチレンの融解温度より
高い滴点を有する潤滑グリース5wt％〜99wt％
と (c) 油のにじみ出しを抑制するための添加物1wt
％〜50wt％とからなる混合物を上記超高分子
量ポリエチレンの融解温度に加熱し、しかる後
冷却して固形化した、油がにじみ出る結果とし
て油性面を有することを特徴とする軸受用潤滑
組成物。 ３ (a) 平均分子量約２×103〜１×105の低分子
量ポリエチレン95wt〜1wt％と、 (b) 上記低分子量ポリエチレンの融解温度より高
い滴点を有する潤滑グリース5wt％〜99wt％ とからなる混合物を上記低分子量ポリエチレン
の融解温度に加熱し、しかる後冷却して固形化
した、油がにじみ出る結果として油性面を有す
ることを特徴とする軸受用潤滑組成物。[Scope of Claims] 1 (a) 95 wt% to 1 wt% of ultra-high molecular weight polyethylene with an average molecular weight of about 1×10 6 to 5×10 6 ; and (b) a dropping point higher than the melting temperature of the ultra-high molecular weight polyethylene. A lubricating grease containing 5 wt% to 99 wt% of a lubricating grease is heated to the melting temperature of the ultra-high molecular weight polyethylene, and then cooled to solidify, and has an oily surface as a result of oil oozing out. Lubricating composition. 2 (a) 95 wt% to 1 wt% of ultra-high molecular weight polyethylene with an average molecular weight of about 1 x 10 6 to 5 x 10 6 ; (b) 5 wt % or more of a lubricating grease having a dropping point higher than the melting temperature of the ultra-high molecular weight polyethylene. 99wt%
and (c) 1wt of additive to suppress oil oozing.
% to 50 wt % is heated to the melting temperature of the ultra-high molecular weight polyethylene and then cooled to solidify, and the lubricating composition has an oily surface as a result of oil oozing out. 3 (a) 95 wt% to 1 wt% of low molecular weight polyethylene with an average molecular weight of about 2×10 3 to 1×10 5 ; (b) 5 wt% to 99 wt% of a lubricating grease having a dropping point higher than the melting temperature of the low molecular weight polyethylene; A lubricating composition for a bearing, characterized in that the mixture is heated to the melting temperature of the low molecular weight polyethylene and then cooled to solidify, and has an oily surface as a result of oil oozing out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4568179A JPS55137198A (en) | 1979-04-13 | 1979-04-13 | Lubricating composition for ball-and-roller bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4568179A JPS55137198A (en) | 1979-04-13 | 1979-04-13 | Lubricating composition for ball-and-roller bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55137198A JPS55137198A (en) | 1980-10-25 |
| JPS6323239B2 true JPS6323239B2 (en) | 1988-05-16 |
Family
ID=12726129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4568179A Granted JPS55137198A (en) | 1979-04-13 | 1979-04-13 | Lubricating composition for ball-and-roller bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55137198A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002349681A (en) * | 2001-05-23 | 2002-12-04 | Harmonic Drive Syst Ind Co Ltd | Lubricating mechanism for wave motion gear device |
| JP2007002213A (en) * | 2005-05-24 | 2007-01-11 | Ntn Corp | Solid lubricant and roller bearing in which solid lubricant is sealed |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6372791A (en) * | 1986-09-17 | 1988-04-02 | Nippon Steel Corp | Self-lubricating composition |
| US6228813B1 (en) | 1993-04-30 | 2001-05-08 | Nsk Ltd. | Rolling bearing filled with a lubricant-containing polymer and process of the same |
| JP4064024B2 (en) * | 1999-11-26 | 2008-03-19 | Ｎｔｎ株式会社 | Rolling bearing |
| JP5036521B2 (en) | 2007-12-12 | 2012-09-26 | 株式会社椿本チエイン | Lubricant composition for chain and chain |
| JP2010065770A (en) * | 2008-09-11 | 2010-03-25 | Sii Micro Precision Kk | Rolling bearing manufacturing method, rolling bearing, and pivot bearing |
| CN102792040B (en) | 2010-03-10 | 2016-03-23 | Ntn株式会社 | Retainer and rolling bearing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS491959A (en) * | 1972-03-15 | 1974-01-09 | ||
| JPS4926430A (en) * | 1972-07-08 | 1974-03-08 | ||
| JPS5422415A (en) * | 1977-07-20 | 1979-02-20 | Skf Ind Inc | Lubricating compositions |
-
1979
- 1979-04-13 JP JP4568179A patent/JPS55137198A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS491959A (en) * | 1972-03-15 | 1974-01-09 | ||
| JPS4926430A (en) * | 1972-07-08 | 1974-03-08 | ||
| JPS5422415A (en) * | 1977-07-20 | 1979-02-20 | Skf Ind Inc | Lubricating compositions |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002349681A (en) * | 2001-05-23 | 2002-12-04 | Harmonic Drive Syst Ind Co Ltd | Lubricating mechanism for wave motion gear device |
| JP2007002213A (en) * | 2005-05-24 | 2007-01-11 | Ntn Corp | Solid lubricant and roller bearing in which solid lubricant is sealed |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55137198A (en) | 1980-10-25 |
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