JP2014108999A - Grease composition for main electric motor shaft bearing of railway vehicle, and shaft bearing - Google Patents
Grease composition for main electric motor shaft bearing of railway vehicle, and shaft bearing Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 52
- 239000004519 grease Substances 0.000 title claims abstract description 44
- 239000003921 oil Substances 0.000 claims abstract description 23
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 16
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 16
- 239000002199 base oil Substances 0.000 claims abstract description 16
- 239000002562 thickening agent Substances 0.000 claims abstract description 13
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 10
- 239000000194 fatty acid Substances 0.000 claims abstract description 10
- 229930195729 fatty acid Natural products 0.000 claims abstract description 10
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 150000001412 amines Chemical class 0.000 claims abstract description 9
- -1 hydroxy fatty acid Chemical class 0.000 claims abstract description 7
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 6
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 6
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 4
- XQVWYOYUZDUNRW-UHFFFAOYSA-N N-Phenyl-1-naphthylamine Chemical compound C=1C=CC2=CC=CC=C2C=1NC1=CC=CC=C1 XQVWYOYUZDUNRW-UHFFFAOYSA-N 0.000 claims description 15
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims description 8
- QAPVYZRWKDXNDK-UHFFFAOYSA-N P,P-Dioctyldiphenylamine Chemical compound C1=CC(CCCCCCCC)=CC=C1NC1=CC=C(CCCCCCCC)C=C1 QAPVYZRWKDXNDK-UHFFFAOYSA-N 0.000 claims description 8
- 235000010354 butylated hydroxytoluene Nutrition 0.000 claims description 8
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 6
- XMIIGOLPHOKFCH-UHFFFAOYSA-N 3-phenylpropionic acid Chemical compound OC(=O)CCC1=CC=CC=C1 XMIIGOLPHOKFCH-UHFFFAOYSA-N 0.000 claims description 5
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 5
- 125000005907 alkyl ester group Chemical group 0.000 claims description 5
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 5
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000005461 lubrication Methods 0.000 abstract description 11
- 239000002530 phenolic antioxidant Substances 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 2
- 229910052799 carbon Inorganic materials 0.000 abstract 2
- ULQISTXYYBZJSJ-UHFFFAOYSA-N 12-hydroxyoctadecanoic acid Chemical compound CCCCCCC(O)CCCCCCCCCCC(O)=O ULQISTXYYBZJSJ-UHFFFAOYSA-N 0.000 description 12
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 10
- 239000002480 mineral oil Substances 0.000 description 8
- 125000004432 carbon atom Chemical group C* 0.000 description 7
- 229940114072 12-hydroxystearic acid Drugs 0.000 description 6
- 235000010446 mineral oil Nutrition 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 125000001931 aliphatic group Chemical group 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000007127 saponification reaction Methods 0.000 description 3
- ZDHCZVWCTKTBRY-UHFFFAOYSA-N 12-hydroxylauric acid Chemical compound OCCCCCCCCCCCC(O)=O ZDHCZVWCTKTBRY-UHFFFAOYSA-N 0.000 description 2
- UGAGPNKCDRTDHP-UHFFFAOYSA-N 16-hydroxyhexadecanoic acid Chemical compound OCCCCCCCCCCCCCCCC(O)=O UGAGPNKCDRTDHP-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- TVIDDXQYHWJXFK-UHFFFAOYSA-N dodecanedioic acid Chemical compound OC(=O)CCCCCCCCCCC(O)=O TVIDDXQYHWJXFK-UHFFFAOYSA-N 0.000 description 2
- PQVSTLUFSYVLTO-UHFFFAOYSA-N ethyl n-ethoxycarbonylcarbamate Chemical compound CCOC(=O)NC(=O)OCC PQVSTLUFSYVLTO-UHFFFAOYSA-N 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 150000002641 lithium Chemical class 0.000 description 2
- GLXDVVHUTZTUQK-UHFFFAOYSA-M lithium hydroxide monohydrate Substances [Li+].O.[OH-] GLXDVVHUTZTUQK-UHFFFAOYSA-M 0.000 description 2
- 229940040692 lithium hydroxide monohydrate Drugs 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- LWBHHRRTOZQPDM-UHFFFAOYSA-N undecanedioic acid Chemical compound OC(=O)CCCCCCCCCC(O)=O LWBHHRRTOZQPDM-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- DYUMLJSJISTVPV-UHFFFAOYSA-N phenyl propanoate Chemical compound CCC(=O)OC1=CC=CC=C1 DYUMLJSJISTVPV-UHFFFAOYSA-N 0.000 description 1
- 229920013639 polyalphaolefin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
- F16C33/6633—Grease properties or compositions, e.g. rheological properties
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2380/00—Electrical apparatus
- F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Lubricants (AREA)
Abstract
Description
本発明は、鉄道車両の主電動機軸受用グリースに関し、高温高速条件でも優れた潤滑寿命を示す潤滑グリース組成物に関する。 The present invention relates to a grease for a main motor bearing of a railway vehicle, and relates to a lubricating grease composition that exhibits an excellent lubricating life even under high temperature and high speed conditions.
鉄道車両の主電動機は、車両の高速化や省エネ化、低騒音化、省保守化など特に環境に配慮したニーズが高まってきている。現在主電動機の主流である誘導電動機は、小型・軽量化、高出力化を実現したが、一方で使用条件が厳しくなったことから、軸受の発熱が大きいという問題がある。また可動部が軸受部分だけであることから、保守周期はこの軸受の寿命に依存することになる。
１個以上のヒドロキシル基を有する炭素数12〜24のヒドロキシ脂肪酸と炭素数２〜12の脂肪族ジカルボン酸のリチウム塩とを増ちょう剤として使用し、40℃の動粘度が300〜500mm2/sの油と40℃の動粘度が80〜300mm2/sの油と40℃の動粘度が20〜80mm2/sの油の三成分が必須成分であってかつ当該三成分を必須成分とする40℃における動粘度が80〜200mm2/sである油を基油として使用することにより高温高速における軸受潤滑寿命を延長させ、また軸受の発熱を少なくした鉄道車両軸受用グリースが提案されている（特許文献１）。
軸受の発熱を少なくすることは、軸受潤滑寿命を延長させる上で重要であるが、電動機自体が発熱するためその影響で軸受部も高温にさらされることになり、グリースの耐熱性が劣ると早期に劣化し、焼付寿命に至ってしまう。
また高温高速用グリースとしては、自動車の電装、補機軸受用で合成油ウレアグリースが多く使用されているが、主電動機では円筒ころ軸受を使用しており、この潤滑にはウレアグリースでは満足な潤滑寿命を得ることが出来ない。
There is a growing need for environmentally friendly main motors for railway vehicles, such as speeding up, energy saving, noise reduction, and maintenance saving. Induction motors, which are currently mainstream of main motors, have been reduced in size, weight, and output, but on the other hand, due to stricter use conditions, there is a problem that heat generation of the bearing is large. Further, since the movable part is only the bearing part, the maintenance cycle depends on the life of the bearing.
A hydroxy fatty acid having 12 to 24 carbon atoms having one or more hydroxyl groups and a lithium salt of an aliphatic dicarboxylic acid having 2 to 12 carbon atoms is used as a thickener, and the kinematic viscosity at 40 ° C. is 300 to 500 mm 2 / and s oil and 40 ° C. kinematic viscosity of 80~300mm 2 / s of the oil and 40 ° C. kinematic viscosity of 20 to 80 mm 2 / s of the essential components a and and the ternary three component essential component of the oil The use of oil with a kinematic viscosity at 40 ° C of 80 to 200 mm 2 / s as the base oil has been proposed to extend the lubrication life of bearings at high temperatures and high speeds, and to reduce the heat generated by the bearings. (Patent Document 1).
Reducing bearing heat generation is important for extending the lubrication life of the bearing. However, the motor itself generates heat, and as a result, the bearing part is also exposed to high temperatures. It will deteriorate to a seizure life.
As high-temperature and high-speed grease, synthetic oil urea grease is often used for automobile electrical equipment and auxiliary bearings, but the main motor uses cylindrical roller bearings. This lubrication is satisfactory with urea grease. Cannot get a lifetime.
本発明が解決しようとする課題は、鉄道車両の更なる高速化、保守周期延長の要求に対応するよう、耐熱性に優れ、軸受潤滑寿命が長い鉄道車両の主電動機軸受用グリース組成物を提供することである。 The problem to be solved by the present invention is to provide a grease composition for a main motor bearing of a railway vehicle that has excellent heat resistance and a long bearing lubrication life so as to meet the demand for further speedup and maintenance cycle extension of the railway vehicle. It is to be.
本発明者らが鋭意検討した結果、高粘度、中粘度、低粘度の三成分の基油を用いることにより、軸受温度上昇を低減することが可能となり、また、アミン系酸化防止剤とヒンダードフェノール系酸化防止剤とを併用することにより、それぞれを単独使用したときよりも大幅にグリース組成物の耐熱性を向上させ、その結果、軸受潤滑寿命の延長が可能となることを見出した。
すなわち、本発明により、以下のグリース組成物及び軸受を提供する：
１．(a) 1個以上のヒドロキシル基を有する炭素数12〜24のヒドロキシ脂肪酸と炭素数2〜12の脂肪酸ジカルボン酸のリチウム塩からなる増ちょう剤、
(b)40℃の動粘度が300〜500mm2/sの油と、40℃の動粘度が80〜300mm2/sの油と、40℃の動粘度が20〜80mm2/sの油とを含有し、かつ40℃における動粘度が80〜200mm2/sである基油、
(c) アミン系酸化防止剤、及び
(d) ヒンダードフェノール系酸化防止剤
を含有する鉄道車両の主電動機軸受用グリース組成物。
２．(c)が、p, p'-ジオクチルジフェニルアミン、N-フェニル-α-ナフチルアミン、アルキル化フェニル-α-ナフチルアミン及びこれらの2種以上の混合物からなる群から選ばれ、かつ
(d)が、2, 6-ジ-tert-ブチル-4-メチルフェノール、ペンタエリスリトールテトラキス（3-（3, 5-ジ-tert-ブチル-4-ヒドロキシフェニル）プロピオネート）、ベンゼンプロパン酸,3, 5-ビス（1, 1-ジメチル-エチル）-4-ヒドロキシC7-C9側鎖アルキルエステル、オクタデシル-3-（3, 5-ジ-t-ブチル-4-ヒドロキシフェニル）プロピオネート及びこれらの2種以上の混合物からなる群から選ばれる、
前記１項記載のグリース組成物。
３．(c)が、p, p'-ジオクチルジフェニルアミンであり、かつ
(d)が、2, 6-ジ-tert-ブチル-4-メチルフェノールである、前記２項記載のグリース組成物。
４．(c)の含有量が、組成物の全質量を基準として、0.5〜5.0質量％であり、かつ
(d)の含有量が、組成物の全質量を基準として、0.5〜5.0質量％である、前記１〜３のいずれか１項記載のグリース組成物。
５．(c)が、p, p'-ジオクチルジフェニルアミン、N-フェニル-α-ナフチルアミン、アルキル化フェニル-α-ナフチルアミン及びこれらの2種以上の混合物からなる群から選ばれ、かつ(c)の含有量が、組成物の全質量を基準として、0.5〜5.0質量％である前記１項記載のグリース組成物。
６．(d)が、2, 6-ジ-tert-ブチル-4-メチルフェノール、ペンタエリスリトールテトラキス（3-（3, 5-ジ-tert-ブチル-4-ヒドロキシフェニル）プロピオネート）、ベンゼンプロパン酸,3, 5-ビス（1, 1-ジメチル-エチル）-4-ヒドロキシC7-C9側鎖アルキルエステル、オクタデシル-3-（3, 5-ジ-t-ブチル-4-ヒドロキシフェニル）プロピオネート及びこれらの2種以上の混合物からなる群から選ばれ、かつ(d)の含有量が、組成物の全質量を基準として、0.5〜5.0質量％である前記１又は５項記載のグリース組成物。
７．前記１〜６のいずれか１項記載のグリース組成物を封入した軸受。
As a result of intensive studies by the present inventors, it is possible to reduce the bearing temperature rise by using a three-component base oil having a high viscosity, a medium viscosity and a low viscosity, and an amine antioxidant and a hindered It has been found that the combined use with a phenolic antioxidant significantly improves the heat resistance of the grease composition compared to when each of them is used alone, and as a result, the bearing lubrication life can be extended.
That is, according to the present invention, the following grease composition and bearing are provided:
1. (a) a thickener comprising a lithium salt of a C12-24 hydroxy fatty acid having one or more hydroxyl groups and a C2-12 fatty acid dicarboxylic acid;
(b) and 40 ° C. oil kinematic viscosity of 300 to 500 mm 2 / s of the 40 ° C. oil kinematic viscosity of 80~300mm 2 / s, the kinematic viscosity of 40 ° C. and the oil 20 to 80 mm 2 / s A base oil having a kinematic viscosity at 40 ° C. of 80 to 200 mm 2 / s,
(c) an amine-based antioxidant, and
(d) A grease composition for a main motor bearing of a railway vehicle containing a hindered phenol-based antioxidant.
2. (c) is selected from the group consisting of p, p'-dioctyldiphenylamine, N-phenyl-α-naphthylamine, alkylated phenyl-α-naphthylamine and mixtures of two or more thereof;
(d) is 2,6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate), benzenepropanoic acid, 3 , 5-bis (1,1-dimethyl-ethyl) -4-hydroxy C7-C9 side chain alkyl ester, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate and two of these Selected from the group consisting of mixtures of more than species,
2. The grease composition according to 1 above.
3. (c) is p, p'-dioctyldiphenylamine, and
The grease composition according to the above item 2, wherein (d) is 2,6-di-tert-butyl-4-methylphenol.
4). The content of (c) is 0.5 to 5.0% by mass based on the total mass of the composition, and
4. The grease composition according to any one of 1 to 3, wherein the content of (d) is 0.5 to 5.0% by mass based on the total mass of the composition.
5. (c) is selected from the group consisting of p, p'-dioctyldiphenylamine, N-phenyl-α-naphthylamine, alkylated phenyl-α-naphthylamine and mixtures of two or more thereof, and the content of (c) The grease composition as described in 1 above, wherein 0.5 to 5.0% by mass based on the total mass of the composition.
6). (d) is 2,6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate), benzenepropanoic acid, 3 , 5-bis (1,1-dimethyl-ethyl) -4-hydroxy C7-C9 side chain alkyl ester, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate and two of these 6. The grease composition according to 1 or 5, wherein the grease composition is selected from the group consisting of a mixture of at least seeds, and the content of (d) is 0.5 to 5.0% by mass based on the total mass of the composition.
7). The bearing which enclosed the grease composition of any one of said 1-6.
本発明によれば、従来の鉄道車両の主電動機軸受用グリース組成物に比べ、耐熱性に優れ、軸受潤滑寿命が長い鉄道車両の主電動機軸受用グリース組成物を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, compared with the grease composition for main motor bearings of the conventional railway vehicle, the grease composition for main motor bearings of the railway vehicle which is excellent in heat resistance and has a long bearing lubrication life can be provided.
（a）増ちょう剤
本発明で使用する増ちょう剤は、一般的にはリチウムコンプレックスと呼ばれており、リチウム石けんと比較すると耐熱性に優れるという特徴を有する。
本発明の増ちょう剤を構成する炭素数12〜24のヒドロキシ脂肪酸としては、12−ヒドロキシステアリン酸が最も好ましい。その他のものとしては、12−ヒドロキシラウリン酸、16−ヒドロキシパルミチン酸等が挙げられる。
本発明の増ちょう剤を構成する炭素数2〜12の脂肪族ジカルボン酸としては、アゼライン酸が最も好ましい。その他のものとしては、セバシン酸、シュウ酸、マロン酸、コハク酸、グルタル酸、アジピン酸、ピメリン酸、スペリン酸、ウンデカン二酸、ドデカン二酸等が挙げられる。
本発明で使用する増ちょう剤としては、とりわけ、12−ヒドロキシステアリン酸とアゼライン酸のリチウムコンプレックスが好ましい。
本発明で使用する炭素数12〜24のヒドロキシ脂肪酸と炭素数2〜12の脂肪族ジカルボン酸との総量に占める炭素数2〜12の脂肪族ジカルボン酸の割合は20〜40質量％であることが好ましい。20質量％未満又は40質量％を越えると、熱的に安定な増ちょう剤を得難く、高温高速で回転する鉄道車両の主電動機軸受用グリースとしては適さないことがある。
本発明の組成物中の増ちょう剤の配合量は、5〜25質量％であるのが好ましい。5質量％未満では得られるグリースは流動状になることがあり、また25質量％を越えると固化してしまうことがある。より好ましくは8〜20質量％である。
なお、ウレア系増ちょう剤は、一般的にリチウムコンプレックスよりも耐熱性は優れるが、円筒ころ軸受の潤滑に対しては、リチウムコンプレックスに比べ流動性に劣り、十分な潤滑寿命を得ることが出来ない。
(A) Thickener The thickener used in the present invention is generally called a lithium complex, and has a feature that it is excellent in heat resistance as compared with lithium soap.
The hydroxy fatty acid having 12 to 24 carbon atoms constituting the thickener of the present invention is most preferably 12-hydroxystearic acid. Others include 12-hydroxylauric acid, 16-hydroxypalmitic acid and the like.
As the aliphatic dicarboxylic acid having 2 to 12 carbon atoms constituting the thickener of the present invention, azelaic acid is most preferable. Others include sebacic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, peric acid, undecanedioic acid, dodecanedioic acid and the like.
The thickener used in the present invention is particularly preferably a lithium complex of 12-hydroxystearic acid and azelaic acid.
The ratio of the aliphatic dicarboxylic acid having 2 to 12 carbon atoms in the total amount of the hydroxy fatty acid having 12 to 24 carbon atoms and the aliphatic dicarboxylic acid having 2 to 12 carbon atoms used in the present invention is 20 to 40% by mass. Is preferred. If it is less than 20% by mass or exceeds 40% by mass, it is difficult to obtain a thermally stable thickener, and it may not be suitable as a grease for a main motor bearing of a railway vehicle rotating at high temperature and high speed.
The blending amount of the thickener in the composition of the present invention is preferably 5 to 25% by mass. If it is less than 5% by mass, the resulting grease may be fluid, and if it exceeds 25% by mass, it may solidify. More preferably, it is 8-20 mass%.
Urea-based thickeners generally have better heat resistance than lithium complexes, but they are less fluid than lithium complexes for lubrication of cylindrical roller bearings and provide a sufficient lubrication life. Absent.
（b）基油
本発明で使用する基油は、40℃の動粘度が300〜500mm2/sの油と、40℃の動粘度が80〜300mm2/sの油と、40℃の動粘度が20〜80mm2/sの油とを含有し、かつ40℃における動粘度が80〜200mm2/sである。
本発明で使用する基油の40℃における動粘度は、80〜200mm2/sであることが必要であり、100〜150mm2/sであるのが好ましい。80mm2/s未満では高温下で蒸発減量が多く、早期にグリースが固化してしまうことがあり、200mm2/sを越えると低温下での始動性に問題が生じることがある。
基油中に占める40℃の動粘度が20〜80mm2/sの油の割合は、20〜50質量％であるのが好ましい。20質量％未満では軸受の温度上昇が大きくなることがあり、又50質量％を越えると高温下で蒸発減量が多く、早期にグリースが固化してしまうことがある。
本発明で使用する基油としては、鉱油、合成油又はこれらの混合物を使用することができる。合成油としては、アルキルジフェニルエーテルに代表されるエーテル油、ポリαオレフィンに代表される合成炭化水素油および、ジエステル、テトラエステルに代表されるエステル系合成油などがあげられる。鉱油としては、パラフィン系（Ｐ系）鉱油がより好ましい。
(B) a base oil for use in base oils present invention, 40 ° C. and an oil having kinematic viscosity of 300 to 500 mm 2 / s of the 40 ° C. oil kinematic viscosity of 80~300mm 2 / s, and 40 ° C. dynamic viscosity containing an oil of 20 to 80 mm 2 / s, and a kinematic viscosity at 40 ° C. is 80~200mm 2 / s.
The kinematic viscosity at 40 ° C. of the base oil used in the present invention needs to be 80 to 200 mm 2 / s, and preferably 100 to 150 mm 2 / s. If it is less than 80 mm 2 / s, evaporation loss is high at high temperatures, and grease may solidify early. If it exceeds 200 mm 2 / s, problems may arise in startability at low temperatures.
The proportion of oil having a kinematic viscosity at 40 ° C. of 20 to 80 mm 2 / s in the base oil is preferably 20 to 50% by mass. If the amount is less than 20% by mass, the temperature rise of the bearing may increase. If the amount exceeds 50% by mass, the amount of evaporation decreases at high temperatures, and the grease may solidify early.
As the base oil used in the present invention, mineral oil, synthetic oil or a mixture thereof can be used. Synthetic oils include ether oils typified by alkyl diphenyl ethers, synthetic hydrocarbon oils typified by polyalphaolefins, and ester-based synthetic oils typified by diesters and tetraesters. As the mineral oil, paraffinic (P-based) mineral oil is more preferable.
添加剤
本発明は、(c)アミン系酸化防止剤と(d)ヒンダードフェノール系酸化防止剤とを必須成分とする。
(c)アミン系酸化防止剤としては、p, p'-ジオクチルジフェニルアミン、N-フェニル-α-ナフチルアミン、アルキル化フェニル-α-ナフチルアミン及びこれらの混合物からなる群から選ばれるのが好ましい。
本発明の組成物中のアミン系酸化防止剤の配合量は、0.5〜5.0質量％であることが好ましい。0.5質量％未満では効果が低く、5.0質量％を超えても効果は頭打ちとなる。
Additives The present invention comprises (c) an amine-based antioxidant and (d) a hindered phenol-based antioxidant as essential components.
(c) The amine-based antioxidant is preferably selected from the group consisting of p, p′-dioctyldiphenylamine, N-phenyl-α-naphthylamine, alkylated phenyl-α-naphthylamine, and mixtures thereof.
It is preferable that the compounding quantity of the amine antioxidant in the composition of this invention is 0.5-5.0 mass%. If it is less than 0.5% by mass, the effect is low, and if it exceeds 5.0% by mass, the effect reaches its peak.
(d)ヒンダードフェノール系酸化防止剤は、2, 6-ジ-tert-ブチル-4-メチルフェノール、ペンタエリスリトールテトラキス（3-（3, 5-ジ-tert-ブチル-4-ヒドロキシフェニル）プロピオネート）、ベンゼンプロパン酸,3, 5-ビス（1, 1-ジメチル-エチル）-4-ヒドロキシC7-C9側鎖アルキルエステル、オクタデシル-3-（3, 5-ジ-t-ブチル-4-ヒドロキシフェニル）プロピオネート及びこれらの混合物からなる群から選ばれるのが好ましい。
本発明の組成物中のヒンダードフェノール系酸化防止剤の配合量は、0.5〜5.0質量％であることが好ましい。0.5質量％未満では効果が低く、5.0質量％を超えても効果は頭打ちとなる。
(d) The hindered phenol antioxidant is 2,6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate ), Benzenepropanoic acid, 3,5-bis (1,1-dimethyl-ethyl) -4-hydroxy C7-C9 side chain alkyl ester, octadecyl-3- (3,5-di-t-butyl-4-hydroxy Preferably, it is selected from the group consisting of (phenyl) propionate and mixtures thereof.
It is preferable that the compounding quantity of the hindered phenolic antioxidant in the composition of this invention is 0.5-5.0 mass%. If it is less than 0.5% by mass, the effect is low, and if it exceeds 5.0% by mass, the effect reaches its peak.
〔任意の添加剤〕
その他に必要に応じて、グリースに通常配合されるあらゆる添加剤が使用可能である。具体的には、錆止め剤、金属腐食防止剤、油性剤、耐摩耗剤、極圧剤、固体潤滑剤などがあげられる。
[Optional additives]
In addition, any additives usually blended in grease can be used as necessary. Specific examples include rust inhibitors, metal corrosion inhibitors, oiliness agents, antiwear agents, extreme pressure agents, and solid lubricants.
〔混和ちょう度〕
本発明のグリース組成物の混和ちょう度は、好ましくは200〜400、より好ましくは250〜350である。混和ちょう度が400を上回ると、漏洩しやすい。一方、混和ちょう度が200を下回ると、撹拌抵抗が大きくなる。
[Mixing consistency]
The penetration of the grease composition of the present invention is preferably 200 to 400, more preferably 250 to 350. Leakage tends to occur when the penetration level exceeds 400. On the other hand, when the penetration is less than 200, the stirring resistance increases.
本発明のグリース組成物を封入する軸受は、鉄道車両用主電動機に使用される軸受である。主電動機は、全閉型であるのが好ましい。軸受としては、転がり軸受、特にころ軸受、なかでも円筒ころ軸受が好適である。軸受の材質は特に制限されないが、銅であるのが好ましい。 The bearing that encloses the grease composition of the present invention is a bearing used in a railway vehicle main motor. The main motor is preferably a fully closed type. As the bearing, a rolling bearing, particularly a roller bearing, particularly a cylindrical roller bearing is suitable. The material of the bearing is not particularly limited, but is preferably copper.
＜試験グリース＞
試験グリースの内容は、表１、表２に示される。
増ちょう剤は、12ヒドロキシステアリン酸とアゼライン酸のリチウム塩からなるリチウムコンプレックスである。
基油は、鉱油Ａ、Ｂ、Ｃ（全てＰ系鉱油）の三種類を使用し、表に示される割合（質量％）で混合した。それぞれの基油の40℃における動粘度は、下記の通り。
鉱油Ａ：414mm2/s 鉱油Ｂ：101 mm2/s 鉱油Ｃ：39.5mm2/s
添加剤にはアミン系酸化防止剤としてp, p'-ジオクチルジフェニルアミン、フェノール系酸化防止剤として2, 6-ジ-tert-ブチル-4-メチルフェノールを使用した。
<Test grease>
The contents of the test grease are shown in Tables 1 and 2.
The thickener is a lithium complex consisting of a lithium salt of 12 hydroxystearic acid and azelaic acid.
Three types of base oils, mineral oils A, B, and C (all P-based mineral oils) were used and mixed at a ratio (mass%) shown in the table. The kinematic viscosity at 40 ° C of each base oil is as follows.
Mineral oil A: 414mm 2 / s mineral oil B: 101 mm 2 / s mineral oil C: 39.5mm 2 / s
As additives, p, p'-dioctyldiphenylamine was used as an amine-based antioxidant, and 2,6-di-tert-butyl-4-methylphenol was used as a phenol-based antioxidant.
（グリース組成物の調製）
基油426.2gの中に12-ヒドロキシステアリン酸127.5gを加え、完全に透明な液体状態になる温度（80〜90℃）に加熱した。これに予め水100gに水酸化リチウム１水塩19.5gを添加して加熱溶解したものを加え、激しく攪拌しながら12-ヒドロキシステアリン酸のけん化反応を行って12-ヒドロキシステアリン酸のリチウム塩を形成した。
次に、アゼライン酸42.5gを加えて均一な状態になるまで攪拌を継続した。これに予め水100gに水酸化リチウム１水塩19.5gを添加して加熱溶解したものを加え、激しく攪拌しながらアゼライン酸のけん化反応を行った。約60分後赤外分光分析で未反応脂肪酸の吸収が見られないことを確認してけん化反応を終了させた。
次に、加熱工程に入り内容物を200℃まで徐々に加熱した。200℃になった時点で残りの基油364.8ｇを添加しそのまま室温まで冷却し、三段ロールを１回通して、ベースグリースを得た。最終の内容物の量は1000gとした。
上記ベースグリースに、表１、表２に従い酸化防止剤及び基油を添加し、三段ロールを２回通して、実施例１〜８及び比較例１〜６のグリース組成物を得た。
(Preparation of grease composition)
In 426.2 g of base oil, 127.5 g of 12-hydroxystearic acid was added and heated to a temperature (80 to 90 ° C.) at which a completely transparent liquid state was obtained. To this, add 19.5 g of lithium hydroxide monohydrate to 100 g of water in advance and dissolve by heating. Then, saponification of 12-hydroxystearic acid is performed with vigorous stirring to form lithium salt of 12-hydroxystearic acid. did.
Next, 42.5 g of azelaic acid was added and stirring was continued until a uniform state was achieved. A solution prepared by adding 19.5 g of lithium hydroxide monohydrate to 100 g of water and dissolving it by heating was added thereto, and saponification reaction of azelaic acid was performed with vigorous stirring. After about 60 minutes, it was confirmed by infrared spectroscopy that no unreacted fatty acid was absorbed, and the saponification reaction was terminated.
Next, the heating process was started and the contents were gradually heated to 200 ° C. When the temperature reached 200 ° C., 364.8 g of the remaining base oil was added, and the mixture was cooled to room temperature as it was, and passed through a three-stage roll once to obtain a base grease. The final content was 1000 g.
In accordance with Tables 1 and 2, an antioxidant and a base oil were added to the above base grease, and a three-stage roll was passed twice to obtain grease compositions of Examples 1 to 8 and Comparative Examples 1 to 6.
＜試験方法＞
・ちょう度 (JIS K 2220 7)
・滴点（JIS K 2220 8）
・軸受潤滑寿命試験
以下に述べる条件で軸受を回転し、軸受温度が110℃に達した時間を寿命時間とした。
［試験条件］
軸受 ：NU214
荷重 ：ラジアル荷重：250kgf
回転数 ：8200rpm
グリース封入量 ：5.6g
温度 ：120℃コントロール
<Test method>
・ Consistency (JIS K 2220 7)
・ Drip point (JIS K 2220 8)
・ Bearing lubrication life test The bearing life was defined as the time when the bearing was rotated under the conditions described below and the bearing temperature reached 110 ° C.
[Test conditions]
Bearing: NU214
Load: Radial load: 250kgf
Number of revolutions: 8200rpm
Grease filling amount: 5.6 g
Temperature: 120 ℃ control
・軸受温度上昇試験
以下に述べる条件で軸受を回転し、運転中の外輪最高温度を記録する。
［試験条件］
軸受:NF 306
ラジアル荷重:25 lbs
スラスト荷重:40 lbs
回転数:3500rpm
グリース封入量:20 g
試験時間:3時間
・ Bearing temperature rise test Rotate the bearing under the conditions described below and record the maximum temperature of the outer ring during operation.
[Test conditions]
Bearing: NF 306
Radial load: 25 lbs
Thrust load: 40 lbs
Rotation speed: 3500rpm
Grease filling amount: 20 g
Test time: 3 hours
三成分の基油を使用し、かつアミン系酸化防止剤とフェノール系酸化防止剤を併用した実施例１〜８は、軸受の温度上昇が抑えられ、軸受潤滑寿命がいずれも1000h以上と比較例に比べ改善が認められる。 Examples 1-8, which use a three-component base oil and use an amine-based antioxidant and a phenol-based antioxidant in combination, can suppress the temperature rise of the bearing and have a bearing lubrication life of 1000 hours or more. Improvement is recognized compared to.
Claims (7)
(b)40℃の動粘度が300〜500mm2/sの油と、40℃の動粘度が80〜300mm2/sの油と、40℃の動粘度が20〜80mm2/sの油とを含有し、かつ40℃における動粘度が80〜200mm2/sである基油、
(c) アミン系酸化防止剤、及び
(d) ヒンダードフェノール系酸化防止剤
を含有する鉄道車両の主電動機軸受用グリース組成物。 (a) a thickener comprising a lithium salt of a C12-24 hydroxy fatty acid having one or more hydroxyl groups and a C2-12 fatty acid dicarboxylic acid;
(b) and 40 ° C. oil kinematic viscosity of 300 to 500 mm 2 / s of the 40 ° C. oil kinematic viscosity of 80~300mm 2 / s, the kinematic viscosity of 40 ° C. and the oil 20 to 80 mm 2 / s A base oil having a kinematic viscosity at 40 ° C. of 80 to 200 mm 2 / s,
(c) an amine-based antioxidant, and
(d) A grease composition for a main motor bearing of a railway vehicle containing a hindered phenol-based antioxidant.
(d)が、2, 6-ジ-tert-ブチル-4-メチルフェノール、ペンタエリスリトールテトラキス（3-（3, 5-ジ-tert-ブチル-4-ヒドロキシフェニル）プロピオネート）、ベンゼンプロパン酸,3, 5-ビス（1, 1-ジメチル-エチル）-4-ヒドロキシC7-C9側鎖アルキルエステル、オクタデシル-3-（3, 5-ジ-t-ブチル-4-ヒドロキシフェニル）プロピオネート及びこれらの2種以上の混合物からなる群から選ばれる、
請求項１記載のグリース組成物。 (c) is selected from the group consisting of p, p'-dioctyldiphenylamine, N-phenyl-α-naphthylamine, alkylated phenyl-α-naphthylamine and mixtures of two or more thereof;
(d) is 2,6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis (3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate), benzenepropanoic acid, 3 , 5-bis (1,1-dimethyl-ethyl) -4-hydroxy C7-C9 side chain alkyl ester, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate and two of these Selected from the group consisting of mixtures of more than species,
The grease composition according to claim 1.
(d)が、2, 6-ジ-tert-ブチル-4-メチルフェノールである、請求項２記載のグリース組成物。 (c) is p, p'-dioctyldiphenylamine, and
The grease composition according to claim 2, wherein (d) is 2,6-di-tert-butyl-4-methylphenol.
(d)の含有量が、組成物の全質量を基準として、0.5〜5.0質量％である、請求項１〜３のいずれか１項記載のグリース組成物。 The content of (c) is 0.5 to 5.0% by mass based on the total mass of the composition, and
The grease composition according to any one of claims 1 to 3, wherein the content of (d) is 0.5 to 5.0 mass% based on the total mass of the composition.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016138241A (en) * | 2015-01-21 | 2016-08-04 | セイコーインスツル株式会社 | Grease for rolling bearing, rolling bearing, rolling bearing device and information recording and reproducing device |
| CN113528221A (en) * | 2021-06-11 | 2021-10-22 | 深圳市艾润克润滑科技有限公司 | Corrugated board linear bearing lubricating grease and preparation method thereof |
| WO2024101310A1 (en) * | 2022-11-07 | 2024-05-16 | 協同油脂株式会社 | Grease composition for rolling bearings, and rolling bearing |
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| WO2007037322A1 (en) * | 2005-09-29 | 2007-04-05 | Idemitsu Kosan Co., Ltd. | Lubricant composition |
| JP2012087221A (en) * | 2010-10-20 | 2012-05-10 | Kyodo Yushi Co Ltd | Grease composition |
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| JPH03220297A (en) * | 1990-01-25 | 1991-09-27 | Kyodo Yushi Kk | Grease for railroad car bearing |
| WO2007037322A1 (en) * | 2005-09-29 | 2007-04-05 | Idemitsu Kosan Co., Ltd. | Lubricant composition |
| JP2012087221A (en) * | 2010-10-20 | 2012-05-10 | Kyodo Yushi Co Ltd | Grease composition |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016138241A (en) * | 2015-01-21 | 2016-08-04 | セイコーインスツル株式会社 | Grease for rolling bearing, rolling bearing, rolling bearing device and information recording and reproducing device |
| CN113528221A (en) * | 2021-06-11 | 2021-10-22 | 深圳市艾润克润滑科技有限公司 | Corrugated board linear bearing lubricating grease and preparation method thereof |
| WO2024101310A1 (en) * | 2022-11-07 | 2024-05-16 | 協同油脂株式会社 | Grease composition for rolling bearings, and rolling bearing |
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| JP5988376B2 (en) | 2016-09-07 |
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