JP2009275176A - Grease for high-speed bearing - Google Patents

Grease for high-speed bearing Download PDF

Info

Publication number
JP2009275176A
JP2009275176A JP2008129878A JP2008129878A JP2009275176A JP 2009275176 A JP2009275176 A JP 2009275176A JP 2008129878 A JP2008129878 A JP 2008129878A JP 2008129878 A JP2008129878 A JP 2008129878A JP 2009275176 A JP2009275176 A JP 2009275176A
Authority
JP
Japan
Prior art keywords
grease
urea
oil
speed
bearing
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.)
Granted
Application number
JP2008129878A
Other languages
Japanese (ja)
Other versions
JP5346491B2 (en
Inventor
Takayuki Kawamura
隆之 川村
Osamu Saida
理 齊田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Kyodo Yushi Co Ltd
Original Assignee
NTN Corp
Kyodo Yushi Co Ltd
NTN Toyo Bearing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NTN Corp, Kyodo Yushi Co Ltd, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP2008129878A priority Critical patent/JP5346491B2/en
Priority to KR1020107028221A priority patent/KR101610979B1/en
Priority to PCT/JP2009/058818 priority patent/WO2009139371A1/en
Priority to CN2009801176963A priority patent/CN102027102B/en
Priority to DE112009001169.1T priority patent/DE112009001169B4/en
Priority to TW098116170A priority patent/TWI434925B/en
Publication of JP2009275176A publication Critical patent/JP2009275176A/en
Application granted granted Critical
Publication of JP5346491B2 publication Critical patent/JP5346491B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M123/00Lubricating compositions characterised by the thickener being a mixture of two or more compounds covered by more than one of the main groups C10M113/00 - C10M121/00, each of these compounds being essential
    • C10M123/04Lubricating compositions characterised by the thickener being a mixture of two or more compounds covered by more than one of the main groups C10M113/00 - C10M121/00, each of these compounds being essential at least one of them being a macromolecular compound
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M119/00Lubricating compositions characterised by the thickener being a macromolecular compound
    • C10M119/24Lubricating compositions characterised by the thickener being a macromolecular compound containing nitrogen
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30Parts of ball or roller bearings
    • F16C33/66Special parts or details in view of lubrication
    • F16C33/6603Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633Grease properties or compositions, e.g. rheological properties
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/003Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/04Ethers; Acetals; Ortho-esters; Ortho-carbonates
    • C10M2207/0406Ethers; Acetals; Ortho-esters; Ortho-carbonates used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/2805Esters used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/08Amides
    • C10M2215/0813Amides used as thickening agents
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/10Amides of carbonic or haloformic acids
    • C10M2215/102Ureas; Semicarbazides; Allophanates
    • C10M2215/1026Ureas; Semicarbazides; Allophanates used as thickening material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/12Partial amides of polycarboxylic acids
    • C10M2215/121Partial amides of polycarboxylic acids used as thickening agents
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04Phosphate esters
    • C10M2223/045Metal containing thio derivatives
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2227/00Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06Organic compounds derived from inorganic acids or metal salts
    • C10M2227/066Organic compounds derived from inorganic acids or metal salts derived from Mo or W
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00Metal present as such or in compounds
    • C10N2010/02Groups 1 or 11
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01Physico-chemical properties
    • C10N2020/02Viscosity; Viscosity index
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/02Bearings
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10Semi-solids; greasy

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Lubricants (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide grease for a high-speed bearing sufficiently complying with high-speed revolution with a dmN value of ≥1,700,000 and allowing compactification and reduction in operation cost of a machine tool. <P>SOLUTION: The grease for a high-speed bearing is obtained by blending a non-urea grease, which uses a composite amide lithium soap having an amide bond in a molecule as a thickener, with a urea grease using an urea compound as a thickener. The urea compound is obtained by reacting a polyisocyanate component with a monoamine component, and the monoamine component contains 46 mol% or more of aliphatic monoamines for the whole of monoamines. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、工作機械主軸(スピンドル)などの高速回転軸を支持する転がり軸受に用いられる高速軸受用グリースに関する。   The present invention relates to a high-speed bearing grease used for a rolling bearing that supports a high-speed rotating shaft such as a machine tool main spindle (spindle).

工作機械の主軸は、加工能率を上げるために高速で回転するものが好ましく、その軸受には種々の潤滑技術が適用されている。高速回転する主軸に適した潤滑方法としては、例えば、オイルミスト潤滑、エアオイル潤滑、ジェット潤滑などの方法が知られている。しかし、このような潤滑方法は、圧縮空気や給油装置などの付帯設備が必要なものであり、工作機械のイニシャルコストおよびランニングコストを高める原因の一つであり、これらに対してグリース潤滑は、メンテナンスの必要が少なくて好ましい潤滑方法であるといえる。例えば、2000〜8000 rpm またはそれ以上の高速で回転する回転軸を支持する高速転がり軸受としては、工作機械主軸(スピンドル)などを支持するアンギュラ玉軸受や円筒ころ軸受などが挙げられる。   The main spindle of the machine tool is preferably one that rotates at a high speed in order to increase machining efficiency, and various lubrication techniques are applied to the bearings. As a lubrication method suitable for the spindle rotating at high speed, for example, methods such as oil mist lubrication, air-oil lubrication, and jet lubrication are known. However, such a lubrication method requires ancillary equipment such as compressed air and an oil supply device, which is one of the causes of increasing the initial cost and running cost of machine tools. It can be said that this is a preferable lubrication method with less maintenance. For example, examples of the high-speed rolling bearing that supports a rotating shaft that rotates at a high speed of 2000 to 8000 rpm or higher include an angular ball bearing and a cylindrical roller bearing that support a spindle of a machine tool.

図2に示すようにアンギュラ玉軸受11は、ラジアル荷重のほかに一方向からのアキシアル荷重を負荷することができるものであり、鋼球14と内輪12および外輪13との接触点を結ぶ直線がラジアル方向に対して角度(接触角)αをもっている。内輪12と外輪13と鋼球14とで形成される軸受空間に、グリースが封入されている。アンギュラ玉軸受や円筒ころ軸受などからなる高速転がり軸受に使用される潤滑剤としては、給油などのメンテナンスが必要でなく、周囲の環境を汚染しないちょう度に調整された潤滑グリースを採用することが好ましい。   As shown in FIG. 2, the angular ball bearing 11 can apply an axial load from one direction in addition to a radial load, and a straight line connecting the contact points of the steel ball 14 with the inner ring 12 and the outer ring 13 is formed. It has an angle (contact angle) α with respect to the radial direction. Grease is enclosed in a bearing space formed by the inner ring 12, the outer ring 13, and the steel ball 14. Lubricant used in high-speed rolling bearings such as angular ball bearings and cylindrical roller bearings does not require maintenance such as lubrication, and it is possible to use lubricating grease adjusted to a consistency that does not pollute the surrounding environment. preferable.

以下に、スピンドル用転がり軸受などの高速軸受用グリースに要求される潤滑特性と問題点をまとめて示す。
(a)長寿命性転がり軸受の潤滑寿命を可及的に延長するためには、以下の(i) 〜(iii) に説明するように、転がり軸受から潤滑剤(グリースまたはその基油)が漏れにくいこと、グリースの耐熱性に優れること、潤滑に必要な油膜厚さを形成できることが必要である。
The following summarizes the lubrication characteristics and problems required for grease for high-speed bearings such as spindle rolling bearings.
(A) In order to extend the lubrication life of a long-life rolling bearing as much as possible, lubricant (grease or its base oil) is supplied from the rolling bearing as described in (i) to (iii) below. It is necessary that it is difficult to leak, has excellent heat resistance of grease, and can form an oil film thickness necessary for lubrication.

(i) 転がり軸受を高速運転するとき、遠心力によって転がり軸受内のグリースまたはグリースが軸受外部へ流出するか、またはグリース中の基油が分離流出して、潤滑への寄与が大きい転走面近傍に留まり難く、潤滑不良になりやすい。そのような事態を防止するために、シールド板などのシール部材を転がり軸受に装着する対応がなされるが、軸受の構造によっては装着できない場合があり、またシール部材を装着しても潤滑剤や潤滑油を完全に密封できない場合もある。   (i) When rolling bearings are operated at high speeds, the grease in the rolling bearings or grease flows out of the bearings due to centrifugal force, or the base oil in the grease separates and flows out, which makes a significant contribution to lubrication. It is difficult to stay in the vicinity and is prone to poor lubrication. In order to prevent such a situation, a seal member such as a shield plate is attached to the rolling bearing. However, depending on the structure of the bearing, it may not be possible to attach the seal member. In some cases, the lubricant cannot be completely sealed.

高速運転されない転がり軸受の場合、転動体や保持器の運動により摩擦部分から押し出されてしまう余分なグリースは、回転条件によっては軸受内部をある程度還流して再び潤滑に寄与することが考えられる。しかし、高速で回転する工作機械などの回転軸支持用転がり軸受では、軸受内部に発生する風圧がこの還流を妨げるため潤滑不良を起こしやすくなる。このため、高速で回転する転がり軸受では、僅かな量のグリースしか潤滑に寄与しておらず、グリースの性状は特に重要となる。また、高速軸受用グリースは、少量のグリースでも潤滑性能を維持する必要がある。   In the case of a rolling bearing that is not operated at high speed, excess grease that is pushed out from the frictional part due to the movement of the rolling elements and the cage may be recirculated to some extent inside the bearing and contribute to lubrication again depending on the rotation conditions. However, in rolling bearings for supporting a rotating shaft such as a machine tool that rotates at high speed, the wind pressure generated inside the bearing hinders this recirculation, so that lubrication is liable to occur. For this reason, in rolling bearings rotating at high speed, only a small amount of grease contributes to lubrication, and the properties of the grease are particularly important. Further, the grease for high speed bearings needs to maintain the lubricating performance even with a small amount of grease.

(ii) 運転条件が高速化すると軸受の転がり面は局部的に発熱して高温度になり、このとき耐熱性の乏しいグリースは熱劣化し、グリースの寿命は著しく縮まる。このような問題に対しては、耐熱性のある増ちょう剤や基油を使用したり、酸化防止剤を添加したりする試みがなされた。しかし、これらの試みは、耐久性の十分な向上には至らなかった。   (ii) When the operating conditions are increased, the rolling surface of the bearing locally generates heat and becomes high temperature. At this time, the grease with poor heat resistance is thermally deteriorated, and the life of the grease is remarkably shortened. For such problems, attempts have been made to use heat-resistant thickeners and base oils, or to add antioxidants. However, these attempts have not led to a sufficient improvement in durability.

(iii) 潤滑性(油膜厚さ)を向上させた従来のグリースは、基油粘度を高くすると剪断摩擦抵抗が上昇して回転トルクが増加し、発熱量が増大するので、これらを抑制するために基油粘度は低く抑えている。そのため、高速に伴う温度上昇で低粘度となった潤滑油の油膜は薄くなって摺動摩耗を起こす場合があった。   (iii) Conventional grease with improved lubricity (oil film thickness) increases shear friction resistance and increases rotational torque and heat generation when base oil viscosity is increased. The base oil viscosity is kept low. For this reason, the oil film of the lubricating oil that has become low viscosity due to a temperature rise accompanying high speed may become thin and cause sliding wear.

(b)低トルク性(温度上昇の抑制性)について既存の高速軸受用のグリースは、前述のように基油粘度を低く抑えているが、軸受が高速度で回転すると、温度上昇により粘度が著しく低下し、潤滑に必要な厚さの油膜を形成できなくなるという問題がある。   (B) Low torque (inhibition of temperature rise) Existing high-speed bearing grease keeps the base oil viscosity low as described above, but when the bearing rotates at high speed, the viscosity increases due to temperature rise. There is a problem that the oil film is remarkably lowered and an oil film having a thickness necessary for lubrication cannot be formed.

(c)低振動性については、グリースの増ちょう剤の種類によって軸受の振動を増大させる場合がある。すなわち、大きくて硬い凝集体を形成する増ちょう剤を含有するグリースでは潤滑する転がり軸受の振動は大きくなる。   (C) About low vibration property, the vibration of the bearing may be increased depending on the type of the thickener of grease. That is, with a grease containing a thickener that forms large and hard aggregates, the vibration of the rolling bearing to be lubricated becomes large.

このように従来のグリースは、高速転がり軸受に用いた場合に軸受の長寿命性、低トルク性および低振動性といった所要物性を満足させることができないという問題点があった。対策として、ウレア化合物を配合したグリースが提案されている(特許文献1〜特許文献3参照)が、より高速性能を得るためには不十分である。   As described above, the conventional grease has a problem that when it is used for a high-speed rolling bearing, required properties such as long life, low torque, and low vibration cannot be satisfied. As a countermeasure, grease containing a urea compound has been proposed (see Patent Documents 1 to 3), but it is insufficient to obtain higher speed performance.

例えば、特許文献3には、40 ℃における動粘度が 15 mm2/sec 以上 40 mm2/sec 以下である基油と、含有量がグリース組成物全体の 9 質量%以上 14 質量%以下であるジウレア化合物の増ちょう剤とを含有し、混和ちょう度が 220 以上 320 以下であるグリース組成物が開示されている。しかしながら、上記グリース組成物においても、グリース封入量を少なくすることが困難であり、軸受の高速回転に十分に対応できず、工作機械のコンパクト化や運転経費の削減をすることは困難である。 For example, Patent Document 3 discloses that a base oil having a kinematic viscosity at 40 ° C. of 15 mm 2 / sec or more and 40 mm 2 / sec or less and a content of 9 mass% or more and 14 mass% or less of the entire grease composition. A grease composition containing a diurea compound thickener and having a miscibility of 220 to 320 is disclosed. However, even in the above grease composition, it is difficult to reduce the amount of grease filled, it is not possible to sufficiently cope with high-speed rotation of the bearing, and it is difficult to make the machine tool compact and reduce the operating cost.

また、近年ますます転がり軸受の使用状態が過酷になり、ピッチ円径dm( mm )と回転数N( rpm )との積であるdmN値が 170 万以上という高速回転で使用されるスピンドル用転がり軸受なども多くなってきている。このような軸受の回転速度の高速化に伴って、既存のグリースで軸受に要求される性能を全て満足させることは困難である。
特開2000−169872号公報 特開2003−83341号公報 特開2006−29473号公報
In recent years, rolling bearings have been used more and more severely, and the rolling for spindles used at high-speed rotation with a dmN value, which is the product of pitch circle diameter dm (mm) and rotation speed N (rpm), is 1.7 million or more. The number of bearings is increasing. As the rotational speed of the bearing increases, it is difficult to satisfy all the performance required for the bearing with existing grease.
Japanese Patent Laid-Open No. 2000-169872 JP 2003-83341 A JP 2006-29473 A

本発明はこのような問題に対処するためになされたものであり、少ないグリース封入量であっても、例えばピッチ円径dm( mm )と回転数N( rpm )との積であるdmN値が 170 万以上という高速回転に十分に対応でき、工作機械のコンパクト化や運転経費の削減を可能にする高速軸受用グリースの提供を目的とする。   The present invention has been made to cope with such a problem. Even if the amount of grease is small, for example, the dmN value which is the product of the pitch circle diameter dm (mm) and the rotation speed N (rpm) is The purpose is to provide grease for high-speed bearings that can sufficiently handle high-speed rotations of 1.7 million or more, and that can make machine tools compact and reduce operating costs.

本発明の高速軸受用グリースは、ウレア系化合物を増ちょう剤とするウレアグリースに、分子内にアミド結合を有する複合アミドリチウム石けんを増ちょう剤とする非ウレアグリースを配合してなる高速軸受用グリースであって、上記ウレア系化合物は、ポリイソシアネート成分とモノアミン成分とを反応して得られ、上記モノアミン成分が脂肪族モノアミンをモノアミン全体に対して 46 モル%以上含有するモノアミン成分であることを特徴とする。   The grease for high-speed bearings of the present invention is for high-speed bearings comprising a urea grease containing a urea compound as a thickener and a non-urea grease containing a composite amide lithium soap having an amide bond in the molecule as a thickener. Grease, wherein the urea compound is obtained by reacting a polyisocyanate component and a monoamine component, and the monoamine component is a monoamine component containing 46 mol% or more of an aliphatic monoamine based on the total monoamine. Features.

上記非ウレアグリースは、上記グリース全体に対する配合割合が 10 重量%〜80 重量%であることを特徴とする。   The non-urea grease is characterized in that the blending ratio with respect to the whole grease is 10 wt% to 80 wt%.

上記複合アミドリチウム石けんは、上記非ウレアグリース全体に対する配合割合が 3 重量%〜40 重量%であることを特徴とする。   The composite amidolithium soap is characterized in that the blending ratio with respect to the whole non-urea grease is 3% by weight to 40% by weight.

上記ウレアグリースおよび上記非ウレアグリースに用いる基油は、動粘度が 15 mm2/sec〜40 mm2/sec であることを特徴とする。 The base oil used in the urea grease and the non-urea grease, kinematic viscosity, characterized in that a 15 mm 2 / sec~40 mm 2 / sec.

上記ウレアグリースおよび上記非ウレアグリースに用いる基油は、合成炭化水素油、エステル油およびアルキルジフェニルエーテル油から選ばれた少なくとも1つであることを特徴とする。   The base oil used for the urea grease and the non-urea grease is at least one selected from a synthetic hydrocarbon oil, an ester oil, and an alkyl diphenyl ether oil.

上記高速軸受用グリースは、添加剤として有機モリブデン化合物および有機亜鉛化合物から選ばれる少なくとも一つを添加したことを特徴とする。   The grease for high-speed bearings is characterized in that at least one selected from an organic molybdenum compound and an organic zinc compound is added as an additive.

本発明の高速軸受用グリースは、所定のウレア系化合物を増ちょう剤とするウレアグリースに、分子内にアミド結合を有する複合アミドリチウム石けんを増ちょう剤とする非ウレアグリースを配合してなるので、少量のグリース封入量であっても、このグリースを封入した転がり軸受の耐荷重性を保ちつつ高速回転下で軌道面への油の供給能力に優れる。   The grease for high-speed bearings of the present invention is formed by blending a urea grease containing a predetermined urea compound as a thickener with a non-urea grease containing a composite amide lithium soap having an amide bond in the molecule as a thickener. Even if a small amount of grease is charged, the oil supply capacity to the raceway surface is excellent under high-speed rotation while maintaining the load resistance of the rolling bearing filled with this grease.

ウレア系化合物を構成するモノアミン成分は、脂肪族モノアミンをモノアミン全体に対して 46 モル%以上含有するので、高速下でのせん断力に対して、増ちょう剤が容易に破壊されず、増ちょう剤繊維の毛細管現象により、転走面に安定的にグリース中の油分を供給することができる。   The monoamine component that constitutes the urea compound contains 46 mol% or more of aliphatic monoamine with respect to the total monoamine, so that the thickener is not easily destroyed against shearing force under high speed, and the thickener Due to the capillary action of the fibers, the oil in the grease can be stably supplied to the rolling surface.

本発明の高速軸受用グリースが封入される高速軸受の一例として、図1に示されるアンギュラ玉軸受を例示することができる。図1は本発明の高速軸受用グリースが封入されたアンギュラ玉軸受を示す縦断面図である。
このアンギュラ玉軸受1は、図1に示すように、内輪2と外輪3との間に転動体4が保持器5で保持された軸受空間を、外輪3の内周面に設けられた係止溝に固定したシール部材6で密封した軸受である。本発明の高速軸受用グリース8は、内輪2と外輪3と転動体4とで形成される軸受空間内で、少なくとも転動体4の周囲に封入される。アンギュラ玉軸受1では、外輪3の内径面に周溝状のグリースポケット7を形成して、グリースの漏洩を物理的に防止している。転動体4と、内輪2および外輪3との接触点を結ぶ直線がラジアル方向に対して接触角βを有しており、ラジアル荷重と一方向のアキシアル荷重を負荷することができる。また、転動体4は、窒化珪素や炭化珪素等のセラミック製とすることもできる。
As an example of the high-speed bearing in which the grease for high-speed bearings of the present invention is enclosed, an angular ball bearing shown in FIG. 1 can be exemplified. FIG. 1 is a longitudinal sectional view showing an angular ball bearing in which grease for high-speed bearings according to the present invention is enclosed.
As shown in FIG. 1, the angular ball bearing 1 has a bearing space in which a rolling element 4 is held by a cage 5 between an inner ring 2 and an outer ring 3. The bearing is sealed with a seal member 6 fixed in the groove. The grease 8 for high-speed bearings of the present invention is enclosed at least around the rolling element 4 in a bearing space formed by the inner ring 2, the outer ring 3 and the rolling element 4. In the angular ball bearing 1, a circumferential groove-like grease pocket 7 is formed on the inner diameter surface of the outer ring 3 to physically prevent leakage of grease. A straight line connecting the contact points of the rolling elements 4 with the inner ring 2 and the outer ring 3 has a contact angle β with respect to the radial direction, and can carry a radial load and an axial load in one direction. Moreover, the rolling element 4 can also be made from ceramics, such as silicon nitride and silicon carbide.

本発明の高速軸受用グリースは、軸受に封入する際には、軸受空隙部の容積の 1 体積%以上 10 体積%未満の量を封入することが好ましい。1 体積%未満であると、潤滑に必要なグリース量が不足して枯渇し、耐久性に劣る。10 体積%以上であると、撹拌によるトルク増による発熱で耐久性が向上しないし、また、コスト増につながり環境上も好ましくない。   When the grease for high-speed bearings of the present invention is enclosed in the bearing, it is preferable to enclose an amount of 1 volume% or more and less than 10 volume% of the volume of the bearing gap. If it is less than 1% by volume, the amount of grease necessary for lubrication is insufficient and depleted, resulting in poor durability. If it is 10% by volume or more, the durability is not improved by heat generation due to the torque increase by stirring, and the cost is increased, which is not preferable in the environment.

本発明の高速軸受用グリースを封入できる高速軸受としては、図1に示すアンギュラ玉軸受のほか、深溝玉軸受、円筒ころ軸受、円すいころ軸受、自動調心ころ軸受、針状ころ軸受、スラスト円筒ころ軸受、スラスト円すいころ軸受、スラスト針状ころ軸受、スラスト自動調心ころ軸受等が挙げられる。   In addition to the angular ball bearing shown in FIG. 1, the high-speed bearing capable of enclosing the high-speed bearing grease of the present invention includes a deep groove ball bearing, a cylindrical roller bearing, a tapered roller bearing, a self-aligning roller bearing, a needle roller bearing, and a thrust cylinder. Examples thereof include a roller bearing, a thrust tapered roller bearing, a thrust needle roller bearing, and a thrust self-aligning roller bearing.

本発明においてウレアグリースおよび非ウレアグリースに使用できる基油は、40℃における動粘度(以下、単に動粘度と記す)が 15〜40 mm2/sec の潤滑油を用いることが好ましい。特に、動粘度が 18〜30 mm2/sec の潤滑油がより好ましい。動粘度が 15 mm2/sec 未満の場合、粘度が低すぎて十分な耐荷重性が得られない。また、動粘度が 40 mm2/sec をこえる場合、高速回転に伴って軌道面への油の供給が不足し、早期に軸受寿命に至るようになる。 In the present invention, the base oil that can be used for the urea grease and the non-urea grease is preferably a lubricating oil having a kinematic viscosity at 40 ° C. (hereinafter simply referred to as kinematic viscosity) of 15 to 40 mm 2 / sec. In particular, a lubricating oil having a kinematic viscosity of 18 to 30 mm 2 / sec is more preferable. When the kinematic viscosity is less than 15 mm 2 / sec, the viscosity is too low to obtain sufficient load resistance. Also, if the kinematic viscosity exceeds 40 mm 2 / sec, oil supply to the raceway surface becomes insufficient with high-speed rotation, and the bearing life will be reached early.

上記ウレアグリースおよび非ウレアグリースの基油の種類としては、合成炭化水素油、エステル油、アルキルジフェニルエーテル油、鉱油、GTL油等が挙げられる。これらの基油は、単独で、または 2 種類以上組み合わせて用いることができる。これらの中で合成炭化水素油、エステル油、アルキルジフェニルエーテル油を用いることが好ましい。   Examples of the base oil of the urea grease and the non-urea grease include synthetic hydrocarbon oil, ester oil, alkyl diphenyl ether oil, mineral oil, GTL oil, and the like. These base oils can be used alone or in combination of two or more. Among these, it is preferable to use a synthetic hydrocarbon oil, an ester oil, or an alkyl diphenyl ether oil.

また、合成炭化水素油、エステル油、アルキルジフェニルエーテル油、それぞれの動粘度が 10〜40 mm2/sec であることが好ましい。この範囲であると混合油とした場合であっても、動粘度の範囲を上述の 10〜40 mm2/sec とすることができる。混合油とする場合、合成炭化水素油を必須成分とすることが好ましく、また、合成炭化水素油はエステル油またはアルキルジフェニルエーテル油よりも重量割合で同量以上であることが好ましい。 Further, it is preferable that the kinematic viscosities of synthetic hydrocarbon oil, ester oil, and alkyl diphenyl ether oil are 10 to 40 mm 2 / sec. Even if it is a mixed oil as it is this range, the range of kinematic viscosity can be 10-40 mm < 2 > / sec mentioned above. When the mixed oil is used, it is preferable that the synthetic hydrocarbon oil is an essential component, and the synthetic hydrocarbon oil is preferably equal to or more in weight than the ester oil or the alkyl diphenyl ether oil.

合成炭化水素油としては、例えばノルマルパラフィン、イソパラフィン、ポリブテン、ポリイソブチレン、1-デセンオリゴマー、1-デセンとエチレンコオリゴマー等のポリ-α-オレフィン等が挙げられる。   Examples of the synthetic hydrocarbon oil include normal paraffin, isoparaffin, polybutene, polyisobutylene, 1-decene oligomer, poly-α-olefin such as 1-decene and ethylene co-oligomer, and the like.

エステル油としては、例えばジブチルセバケート、ジ-2-エチルヘキシルセバケート、ジオクチルアジペート、ジイソデシルアジペート、ジトリデシルアジペート、ジトリデシルタレート、メチル・アセチルシノレート等のジエステル油、トリオクチルトリメリテート、トリデシルトリメリテート、テトラオクチルピロメリテート等の芳香族エステル油、トリメチロールプロパンカプリレート、トリメチロールプロパンベラルゴネート、ペンタエリスリトール-2-エチルヘキサノエート、ペンタエリスリトールベラルゴネート等のポリオールエステル油、炭酸エステル油等が挙げられる。   Examples of ester oils include dibutyl sebacate, di-2-ethylhexyl sebacate, dioctyl adipate, diisodecyl adipate, ditridecyl adipate, ditridecyl tartrate, and methyl acetyl cinnolate, trioctyl trimellitate, trioctyl trimellate Aromatic ester oils such as decyl trimellitate and tetraoctyl pyromellitate, polyol ester oils such as trimethylolpropane caprylate, trimethylolpropane verargonate, pentaerythritol-2-ethylhexanoate, and pentaerythritol verargonate And carbonate ester oil.

アルキルジフェニルエーテル油としては、モノアルキルジフェニルエーテル、ジアルキルジフェニルエーテル、ポリアルキルジフェニルエーテル等が挙げられる。   Examples of the alkyl diphenyl ether oil include monoalkyl diphenyl ether, dialkyl diphenyl ether, and polyalkyl diphenyl ether.

鉱油としては、原油から得られる潤滑油を減圧蒸留、油剤脱れき、溶剤抽出、水素化分解、溶剤脱ろう、硫酸洗浄、白土精製、水素化精製等の精製を行なったものを用いることができる。   As the mineral oil, use can be made of a lubricant obtained from crude oil subjected to vacuum distillation, oil removal, solvent extraction, hydrocracking, solvent dewaxing, sulfuric acid washing, clay purification, hydrorefining, and the like. .

本発明におけるウレアグリースは、上記基油に増ちょう剤としてウレア系化合物を配合してなるグリースである。本発明に使用できるウレア系化合物(ウレア系増ちょう剤)は、ポリイソシアネート成分とモノアミン成分とを反応して得られる。   The urea grease in the present invention is a grease obtained by blending a urea compound as a thickener in the above base oil. The urea compound (urea thickener) that can be used in the present invention is obtained by reacting a polyisocyanate component and a monoamine component.

上記ポリイソシアネート成分としては、フェニレンジイソシアネート、トリレンジイソシアネート、ジフェニルジイソシアネート、ジフェニルメタンジイソシアネート、オクタデカンジイソシアネート、デカンジイソシアネート、ヘキサンジイソシアネー卜等が挙げられる。これらの中でも芳香族ジイソシアネートが好ましい。また、ジアミンと該ジアミンに対してモル比で過剰のジイソシアネートとの反応で得られるポリイソシアネートを使用することができる。ジアミンとしては、エチレンジアミン、プロパンジアミン、ブタンジアミン、ヘキサンジアミン、オクタンジアミン、フェニレンジアミン、トリレンジアミン、キシレンジアミン、ジアミノジフェニルメタン等が挙げられる。   Examples of the polyisocyanate component include phenylene diisocyanate, tolylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate, octadecane diisocyanate, decane diisocyanate, and hexane diisocyanate. Of these, aromatic diisocyanates are preferred. Moreover, the polyisocyanate obtained by reaction with excess diisocyanate by molar ratio with respect to diamine and this diamine can be used. Examples of the diamine include ethylenediamine, propanediamine, butanediamine, hexanediamine, octanediamine, phenylenediamine, tolylenediamine, xylenediamine, and diaminodiphenylmethane.

上記モノアミン成分は、脂肪族モノアミンをモノアミン全体に対して 46 モル%以上、好ましくは 80 モル%以上含有するモノアミン成分である。46 モル%以上含むことにより増ちょう剤のせん断安定性が強く、高速下でも容易に破壊されず、増ちょう剤の毛細管現象により、グリース中の基油を転走部に供給できる。上記モノアミン成分を構成する脂肪族モノアミン以外のモノアミンとしては、脂環式モノアミン、芳香族モノアミンが挙げられる。   The monoamine component is a monoamine component containing an aliphatic monoamine in an amount of 46 mol% or more, preferably 80 mol% or more based on the total monoamine. By containing 46 mol% or more, the thickener has strong shear stability and is not easily destroyed even at high speeds, and the base oil in the grease can be supplied to the rolling section by the capillary action of the thickener. Examples of monoamines other than aliphatic monoamines constituting the monoamine component include alicyclic monoamines and aromatic monoamines.

脂肪族モノアミンとしては、ヘキシルアミン、オクチルアミン、ドデシルアミン、ヘキサデシルアミン、オクタデシルアミン、ステアリルアミン、オレイルアミンが挙げられ、これらの中でもオクチルアミンが好ましい。脂環式モノアミンとしては、シクロヘキシルアミンなどが挙げられる。芳香族モノアミンとしては、アニリン、p-トルイジンが挙げられ、これらの中でアニリンを用いることが好ましい。   Examples of the aliphatic monoamine include hexylamine, octylamine, dodecylamine, hexadecylamine, octadecylamine, stearylamine, and oleylamine. Among these, octylamine is preferable. Examples of the alicyclic monoamine include cyclohexylamine. Examples of the aromatic monoamine include aniline and p-toluidine, and among these, aniline is preferably used.

本発明においてウレア系増ちょう剤は、ウレアグリース全体に対して、3〜20 重量%の割合で配合することが好ましい。特に、5〜16 重量%の配合量とすることが好ましい。配合量が 3 重量%未満では基油保持能力が十分ではなく、特に回転初期に一時に大量の油分が分離してグリースの漏洩が起こり、軸受耐久寿命が短くなる。また、配合量が 20 重量%をこえると、相対的に基油の量が少なくなり、油供給性が不十分で、早期に潤滑不足に陥って同様に軸受耐久寿命が短くなる。   In the present invention, the urea-based thickener is preferably blended in an amount of 3 to 20% by weight based on the entire urea grease. In particular, the blending amount is preferably 5 to 16% by weight. If the blending amount is less than 3% by weight, the base oil retention capacity is not sufficient, and especially at the beginning of rotation, a large amount of oil is separated at one time and grease leakage occurs, resulting in a shortened bearing durability life. On the other hand, if the blending amount exceeds 20% by weight, the amount of the base oil is relatively small, the oil supply ability is insufficient, the lubrication is insufficient early, and the bearing durability life is similarly shortened.

本発明における非ウレアグリースは、ウレア系化合物を含まず、上記基油に増ちょう剤として複合アミドリチウム石けんを配合してなる金属複合石けん系のグリースである。   The non-urea grease in the present invention is a metal composite soap-based grease which does not contain a urea-based compound and is obtained by blending a complex amide lithium soap as a thickener with the above base oil.

本発明に使用する複合アミドリチウム石けんは、脂肪族ジカルボン酸、脂肪族モノアミン、水酸化リチウムなどから合成され、特に分子内にアミド結合を有するものである。複合アミドリチウム石けんを増ちょう剤とする非ウレアグリースの市販品としては、協同油脂社製:パルマックスRBGが挙げられる。   The composite amidolithium soap used in the present invention is synthesized from an aliphatic dicarboxylic acid, an aliphatic monoamine, lithium hydroxide or the like, and particularly has an amide bond in the molecule. As a commercial product of non-urea grease using composite amidolithium soap as a thickener, Kyodo Yushi Co., Ltd .: Palmax RBG can be mentioned.

本発明において複合アミドリチウム石けんは、非ウレアグリース全体に対して 3〜40 重量%割合で配合することが好ましい。配合量が 3 重量%を未満では、グリースが軟質でせん断により軸受から容易に漏れやすくなる。また、配合量が 40 重量%をこえるとグリース中の油分が少なく、油供給性が悪くなるおそれがある。   In the present invention, the composite amidolithium soap is preferably blended in an amount of 3 to 40% by weight based on the whole non-urea grease. If the blending amount is less than 3% by weight, the grease is soft and easily leaks from the bearing due to shearing. On the other hand, if the blending amount exceeds 40% by weight, the oil content in the grease is small and there is a risk that the oil supply performance will deteriorate.

本発明の高速軸受用グリースにおいて非ウレアグリースは、グリース全量に対して 10〜80 重量%の割合で配合することが好ましい。特に、20〜50 重量%の配合量とすることが好ましい。非ウレアグリースとして、配合量が 10 重量%未満では転走部への油供給性が悪い。また、配合量が 80 重量%をこえると、高速下で増ちょう剤の繊維が破壊されやすく、増ちょう剤の毛細管現象により基油を転走部へ供給できない。   In the grease for high-speed bearings of the present invention, the non-urea grease is preferably blended at a ratio of 10 to 80% by weight with respect to the total amount of grease. In particular, the blending amount is preferably 20 to 50% by weight. As non-urea grease, if the blending amount is less than 10% by weight, the oil supply to the rolling section is poor. If the blending amount exceeds 80% by weight, the fiber of the thickener tends to be broken at high speed, and the base oil cannot be supplied to the rolling section due to the capillary action of the thickener.

また、本発明においてウレアグリースと非ウレアグリースとの混合グリースには、必要に応じて公知のグリース用添加剤を含有させることができる。この添加剤として、例えば、有機亜鉛化合物、アミン系、フェノール系化合物等の酸化防止剤、ベンゾトリアゾールなどの金属不活性剤、ポリメタクリレート、ポリスチレン等の粘度指数向上剤、二硫化モリブデン、グラファイト等の固体潤滑剤、金属スルホネート、多価アルコールエステルなどの防錆剤、有機モリブデン化合物などの摩擦低減剤、エステル、アルコールなどの油性剤、りん系化合物などの摩耗防止剤等が挙げられる。これらを単独または 2 種類以上組み合せて添加できる。   In the present invention, a known grease additive may be contained in the mixed grease of urea grease and non-urea grease, if necessary. Examples of the additives include antioxidants such as organic zinc compounds, amines, and phenolic compounds, metal deactivators such as benzotriazole, viscosity index improvers such as polymethacrylate and polystyrene, molybdenum disulfide, and graphite. Examples include solid lubricants, metal sulfonates, rust preventive agents such as polyhydric alcohol esters, friction reducing agents such as organic molybdenum compounds, oily agents such as esters and alcohols, and antiwear agents such as phosphorus compounds. These can be added alone or in combination of two or more.

これらの添加剤のうち、有機亜鉛化合物と有機モリブデン化合物は、極圧性に優れ、転走面への油の供給が不足した状態でも、焼きつきを防止させるため効果的である。   Of these additives, the organic zinc compound and the organic molybdenum compound are excellent in extreme pressure properties, and are effective in preventing seizure even in a state where the supply of oil to the rolling surface is insufficient.

これらの添加剤の含有量は、個別にはグリース全量の 0.05 重量%以上、合計量でグリース全量の 0.15〜10 重量%の範囲となることが好ましい。特に、合計量で 10 重量%をこえる場合は、含有量の増加に見合う効果が期待できないばかりか、相対的に他の成分の含有量が少なくなり、またグリース中でこれら添加剤が凝集し、トルク上昇等の好ましくない現象を招くこともある。   The content of these additives is preferably individually 0.05% by weight or more of the total amount of grease, and the total amount is preferably in the range of 0.15 to 10% by weight of the total amount of grease. In particular, when the total amount exceeds 10% by weight, not only an effect commensurate with the increase in content can be expected, but also the content of other components becomes relatively small, and these additives aggregate in the grease, Undesirable phenomena such as an increase in torque may be caused.

以下に実施例を挙げて本発明をさらに説明するが、本発明はこれにより何ら制限されるものではない。   The present invention will be further described below with reference to examples, but the present invention is not limited thereto.

<ウレアグリースの調製>
ウレアグリースU1〜U7
表1に示した基油の半量に、4,4’-ジフェニルメタンジイソシアネート(日本ポリウレタン工業社製:ミリオネートMT、以下、MDIと記す)を表1に示す割合で溶解し、残りの半量の基油にMDIの2倍当量となるモノアミンを溶解した。それぞれの配合割合および種類は表1のとおりである。MDIを溶解した溶液を撹拌しながらモノアミンを溶解した溶液を加えた後、100℃〜120℃で 30分間撹拌を続けて反応させて、ジウレア化合物を基油中に生成させウレアグリース試料を得た。
<Preparation of urea grease>
Urea grease U1-U7
In half of the base oil shown in Table 1, 4,4′-diphenylmethane diisocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd .: Millionate MT, hereinafter referred to as MDI) is dissolved in the proportion shown in Table 1, and the remaining half of the base oil is dissolved. A monoamine having a double equivalent of MDI was dissolved in the solution. The respective blending ratios and types are shown in Table 1. After adding a solution in which monoamine was dissolved while stirring a solution in which MDI was dissolved, stirring was continued for 30 minutes at 100 ° C. to 120 ° C. to produce a diurea compound in the base oil to obtain a urea grease sample. .

<非ウレアグリースの調製>
非ウレアグリースNU1〜NU4
表1に示した基油に、複合アミドリチウム石けんを含む混合物(Nアルキル置換モノアミド酸のリチウム塩(下記式(1)参照)と、ニ塩基酸のリチウム塩と、Nアルキル置換ジアミドとの混合物)を増ちょう剤として配合してなる非ウレアグリース試料を得た。それぞれの配合割合および種類は表1のとおりである。

Figure 2009275176
<Preparation of non-urea grease>
Non-urea grease NU1 to NU4
A mixture containing a complex amidolithium soap in the base oil shown in Table 1 (a mixture of a lithium salt of an N-alkyl-substituted monoamidic acid (see formula (1) below), a lithium salt of a dibasic acid, and an N-alkyl-substituted diamide ) Was added as a thickener to obtain a non-urea grease sample. The respective blending ratios and types are shown in Table 1.
Figure 2009275176

Figure 2009275176
Figure 2009275176

実施例1〜実施例12
上記ウレアグリースと非ウレアグリースとを表2に示す割合で混合しグリース試料を得た。なお、実施例11には、ジチオりん酸亜鉛およびモリブデンジチオカーバメートを、上記ウレアグリースと非ウレアグリースとの混合グリース 100 重量%に対してそれぞれ 2 重量%添加した。得られたグリース試料を以下に示す遠心油分離試験および深溝玉軸受(6204)による常温高速グリース試験に供し、遠心離油度およびグリース寿命時間を測定した。実施例1、実施例4、実施例6、実施例9、実施例11および実施例12については以下に示すアンギュラ玉軸受による常温高速グリース試験も実施した。これらの測定結果を表2に併記する。
Examples 1 to 12
The above urea grease and non-urea grease were mixed at the ratio shown in Table 2 to obtain a grease sample. In Example 11, 2% by weight of zinc dithiophosphate and molybdenum dithiocarbamate were added to 100% by weight of the mixed grease of urea grease and non-urea grease, respectively. The obtained grease samples were subjected to a centrifugal oil separation test and a deep groove ball bearing (6204) shown below, and a normal temperature high speed grease test was performed to measure centrifugal oil separation and grease life time. About Example 1, Example 4, Example 6, Example 9, Example 11, and Example 12, the normal temperature high speed grease test by the angular ball bearing shown below was also implemented. These measurement results are also shown in Table 2.

<遠心油分離試験>
遠心分離機を用い、50 g のグリース試料を遠心分離管に入れ、40℃で 23000 G の加速度を 7 時間かけたときの遠心離油度を次式により求めた。遠心離油度が 20%以上であると油の供給能力が十分となる。
(遠心離油度、%)=(1−試験前の増ちょう剤濃度/試験後の増ちょう剤濃度)×100
<Centrifuge oil separation test>
Using a centrifuge, a 50 g grease sample was placed in a centrifuge tube, and the oil separation by centrifugation was calculated using the following formula when acceleration of 23000 G was applied for 7 hours at 40 ° C. If the centrifugal oil separation is 20% or more, the oil supply capacity will be sufficient.
(Centrifugal oil separation,%) = (1−thickener concentration before test / thickener concentration after test) × 100

<常温高速グリース試験−深溝玉軸受(6204)>
深溝玉軸受(6204)に、グリース試料を転走面狙いで 0.14 g (軸受全空間容積の約 3 体積%)封入し、非接触シールして試験軸受を作製した。試験軸受に、アキシアル荷重 670 N とラジアル荷重 67 N とを負荷し、常温環境下で 15000 rpm の回転速度で回転させ、焼き付きに至るまでの時間をグリース寿命時間として測定した。この試験において、グリース寿命時間が 1000 時間以上であると耐久性に優れる。この耐久試験における軸受のピッチ円径(mm)と回転数(rpm)との積であるdmN値は 52 万である。
<Normal Temperature High Speed Grease Test-Deep Groove Ball Bearing (6204)>
A grease bearing sample was sealed in a deep groove ball bearing (6204) aiming at the rolling surface (0.14 g (about 3% by volume of the total bearing space)), and a non-contact seal was made to produce a test bearing. The test bearing was loaded with an axial load of 670 N and a radial load of 67 N, and rotated at a rotational speed of 15000 rpm in a normal temperature environment. The time until seizure was measured as the grease life time. In this test, if the grease life time is 1000 hours or more, the durability is excellent. The dmN value, which is the product of the pitch circle diameter (mm) and the rotational speed (rpm) of the bearing in this durability test, is 520,000.

<常温高速グリース試験−アンギュラ玉軸受>
アンギュラ玉軸受(外径 150 mm×内径 100 mm、内外輪SUJ2、転動体 13/32 インチ窒化珪素球)に、グリース試料を転走面狙いで 3.0 g (軸受全空間容積の約 10 体積%)封入し、非接触シールして試験軸受を作成した。試験軸受を、1.8 GPa 定圧与圧下で、外筒冷却により軸受を冷却し、軸受外輪を 50℃以下に保ちつつ 14500 rpm の回転速度で回転させ、焼き付きに至るまでの時間をグリース寿命時間として測定した。この耐久試験における軸受のピッチ円径(mm)と回転数(rpm)との積であるdmN値は 185 万である。
<Normal Temperature High Speed Grease Test-Angular Contact Ball Bearing>
Angular contact ball bearing (outer diameter 150 mm x inner diameter 100 mm, inner and outer rings SUJ2, rolling element 13/32 inch silicon nitride ball) with grease sample aiming at rolling surface 3.0 g (about 10% by volume of total bearing space) A test bearing was made by sealing and non-contact sealing. The test bearing is cooled by outer cylinder cooling under a constant pressure of 1.8 GPa, and the bearing outer ring is rotated at a rotational speed of 14500 rpm while keeping the bearing outer ring at 50 ° C or less. The time until seizure is measured as the grease life time. did. The dmN value, which is the product of the bearing pitch circle diameter (mm) and the rotational speed (rpm), in this durability test is 1.85 million.

比較例1〜比較例10
表2に示したウレアグリースまたは非ウレアグリースをグリース試料とした。このグリース試料について実施例1と同様の項目を測定した。比較例1および比較例7については上述のアンギュラ玉軸受による常温高速グリース試験も実施した。これらの測定結果を表2に併記する。
Comparative Example 1 to Comparative Example 10
Urea grease or non-urea grease shown in Table 2 was used as a grease sample. The same items as in Example 1 were measured for this grease sample. For Comparative Example 1 and Comparative Example 7, a normal temperature high speed grease test using the angular ball bearing described above was also performed. These measurement results are also shown in Table 2.

Figure 2009275176
Figure 2009275176

表2に示すように、本発明に使用されるグリースでは、(1)ウレアグリースと非ウレアグリースとを配合したグリースであり、ウレアグリースの増ちょう剤がポリイソシアネート成分とモノアミン成分とを反応して得られ、モノアミン成分が脂肪族モノアミンをモノアミン全体に対して 46 モル%以上含有するモノアミン成分であること、(2)複合アミドリチウム石けんを増ちょう剤とする非ウレアグリースのグリース全体に対する配合割合が 10〜80 重量%であること、(3)基油は動粘度が 10〜40 mm 2/sec であることが好ましいことがわかる。 As shown in Table 2, the grease used in the present invention is (1) a grease containing a urea grease and a non-urea grease, and the thickener of urea urea reacts with the polyisocyanate component and the monoamine component. The monoamine component is a monoamine component containing 46 mol% or more of aliphatic monoamine based on the total amount of monoamine, and (2) blending ratio of non-urea grease with complex amide lithium soap as a thickener to the total grease. 10 to 80% by weight, and (3) the base oil preferably has a kinematic viscosity of 10 to 40 mm 2 / sec.

本発明の高速軸受用グリースは、所定のウレアグリースと、複合アミドリチウム石けんを増ちょう剤とする非ウレアグリースグリースとを配合したグリースであるので、高速回転下での軸受耐久寿命を向上させることができる。このため、旋盤、ボール盤、中ぐり盤、フライス盤、研削盤、ホーニング盤、超仕上盤、ラップ盤等の高速で摺動、回転する工作機械の主軸支持部に組み込まれる転がり軸受に封入する高速軸受用グリースとして好適に利用できる。しかも、オイルエア潤滑法等のように潤滑油を連続して供給する方式と異なり、グリースを封入して使用できるため、運転コストの削減、省スペース化も可能になる。   The grease for high-speed bearings of the present invention is a grease containing a predetermined urea grease and a non-urea grease grease containing a composite amide lithium soap as a thickener, so that it can improve the bearing durability life under high-speed rotation. Can do. For this reason, high-speed bearings enclosed in rolling bearings built into spindle support parts of machine tools that slide and rotate at high speed such as lathes, drilling machines, boring machines, milling machines, grinding machines, super finishing machines, lapping machines, etc. It can be suitably used as a grease. In addition, unlike a method of continuously supplying lubricating oil such as the oil-air lubrication method, grease can be enclosed and used, so that the operating cost can be reduced and the space can be saved.

本発明の高速軸受用グリースが封入されたアンギュラ玉軸受を示す縦断面図である。It is a longitudinal cross-sectional view which shows the angular ball bearing with which the grease for high-speed bearings of this invention was enclosed. アンギュラ玉軸受を示す断面図である。It is sectional drawing which shows an angular contact ball bearing.

符号の説明Explanation of symbols

1、11 アンギュラ玉軸受
2、12 内輪
3、13 外輪
4、14 転動体(鋼球)
5 保持器
6 シール部材
7 グリースポケット
8 グリース
1,11 Angular contact ball bearings 2,12 Inner ring 3,13 Outer ring 4,14 Rolling elements (steel balls)
5 Cage 6 Sealing member 7 Grease pocket 8 Grease

Claims (6)

ウレア系化合物を増ちょう剤とするウレアグリースに、分子内にアミド結合を有する複合アミドリチウム石けんを増ちょう剤とする非ウレアグリースを配合してなる高速軸受用グリースであって、
前記ウレア系化合物は、ポリイソシアネート成分とモノアミン成分とを反応して得られ、前記モノアミン成分が脂肪族モノアミンをモノアミン全体に対して 46 モル%以上含有するモノアミン成分であることを特徴とする高速軸受用グリース。
A grease for high-speed bearings comprising a urea grease containing a urea compound as a thickener and a non-urea grease containing a composite amide lithium soap having an amide bond in the molecule as a thickener,
The urea compound is obtained by reacting a polyisocyanate component and a monoamine component, and the monoamine component is a monoamine component containing 46 mol% or more of an aliphatic monoamine based on the total monoamine. For grease.
前記非ウレアグリースは、前記グリース全体に対する配合割合が 10〜80 重量%であることを特徴とする請求項1記載の高速軸受用グリース。   The high-speed bearing grease according to claim 1, wherein the non-urea grease has a blending ratio of 10 to 80% by weight with respect to the whole grease. 前記複合アミドリチウム石けんは、前記非ウレアグリース全体に対する配合割合が 3〜40 重量%であることを特徴とする請求項1または請求項2記載の高速軸受用グリース。   The grease for high-speed bearings according to claim 1 or 2, wherein the composite amidolithium soap has a blending ratio of 3 to 40 wt% with respect to the whole non-urea grease. 前記ウレアグリースおよび前記非ウレアグリースに用いる基油は、動粘度が 15〜40 mm2/sec であることを特徴とする請求項1、請求項2または請求項3記載の高速軸受用グリース。 4. The grease for high-speed bearings according to claim 1, wherein the base oil used for the urea grease and the non-urea grease has a kinematic viscosity of 15 to 40 mm 2 / sec. 前記ウレアグリースおよび前記非ウレアグリースに用いる基油は、合成炭化水素油、エステル油およびアルキルジフェニルエーテル油から選ばれた少なくとも1つの油であることを特徴とする請求項1ないし請求項4のいずれか一項記載の高速軸受用グリース。   The base oil used for the urea grease and the non-urea grease is at least one oil selected from a synthetic hydrocarbon oil, an ester oil, and an alkyl diphenyl ether oil. The grease for high-speed bearings according to one item. 前記高速軸受用グリースは、添加剤として有機モリブデン化合物および有機亜鉛化合物から選ばれる少なくとも一つを添加したことを特徴とする請求項1ないし請求項5のいずれか一項記載の高速軸受用グリース。   6. The high speed bearing grease according to claim 1, wherein at least one selected from an organic molybdenum compound and an organic zinc compound is added as an additive to the high speed bearing grease.
JP2008129878A 2008-05-16 2008-05-16 Grease for high speed bearings Active JP5346491B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2008129878A JP5346491B2 (en) 2008-05-16 2008-05-16 Grease for high speed bearings
KR1020107028221A KR101610979B1 (en) 2008-05-16 2009-05-12 Grease for high-speed bearing
PCT/JP2009/058818 WO2009139371A1 (en) 2008-05-16 2009-05-12 Grease for high-speed bearing
CN2009801176963A CN102027102B (en) 2008-05-16 2009-05-12 Grease for high-speed bearing
DE112009001169.1T DE112009001169B4 (en) 2008-05-16 2009-05-12 Grease for high speed bearings
TW098116170A TWI434925B (en) 2008-05-16 2009-05-15 High-speed bearings with grease

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008129878A JP5346491B2 (en) 2008-05-16 2008-05-16 Grease for high speed bearings

Publications (2)

Publication Number Publication Date
JP2009275176A true JP2009275176A (en) 2009-11-26
JP5346491B2 JP5346491B2 (en) 2013-11-20

Family

ID=41318738

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008129878A Active JP5346491B2 (en) 2008-05-16 2008-05-16 Grease for high speed bearings

Country Status (6)

Country Link
JP (1) JP5346491B2 (en)
KR (1) KR101610979B1 (en)
CN (1) CN102027102B (en)
DE (1) DE112009001169B4 (en)
TW (1) TWI434925B (en)
WO (1) WO2009139371A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020050337A1 (en) 2018-09-07 2020-03-12 Ntn株式会社 Rolling bearing and spindle device equipped with rolling bearing

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5523223B2 (en) * 2010-07-01 2014-06-18 日立粉末冶金株式会社 Sintered oil-impregnated bearing
EP2931771B1 (en) * 2012-12-15 2016-09-07 BYK-Chemie GmbH Composition for rheology control
JP6521522B2 (en) 2013-03-14 2019-05-29 出光興産株式会社 Method for producing bearing grease composition
DE102014213256B3 (en) 2014-07-08 2015-11-19 Schaeffler Technologies AG & Co. KG Ball bearing for a turbocharger
JP6461520B2 (en) * 2014-08-29 2019-01-30 Ntn株式会社 Rolling bearings for machine tools
WO2024101310A1 (en) * 2022-11-07 2024-05-16 協同油脂株式会社 Grease composition for rolling bearings, and rolling bearing
KR102678829B1 (en) * 2022-12-21 2024-06-26 구연찬 Preparation Method of Grease Composition for Automotive Vehicles with Improved Wear Protection, Load-bearing Performance and Friction Resistance

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63108098A (en) * 1986-10-24 1988-05-12 Kyodo Yushi Kk Heavy load resistant grease composition
JPH0218497A (en) * 1988-07-07 1990-01-22 Kyodo Yushi Kk High-load-resistant grease composition
JP2006029473A (en) * 2004-07-16 2006-02-02 Nsk Ltd Angular ball bearing and machine tool
JP2006265343A (en) * 2005-03-23 2006-10-05 Nsk Ltd Antifriction bearing
JP2008074978A (en) * 2006-09-21 2008-04-03 Showa Shell Sekiyu Kk Urea grease composition

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0631375B2 (en) * 1985-02-13 1994-04-27 コスモ石油株式会社 Grease composition
JP2000169872A (en) 1998-10-02 2000-06-20 Ntn Corp Grease for high-speed roller bearing and roller bearing for spindle
JP2003083341A (en) 2001-09-12 2003-03-19 Nsk Ltd Rolling bearing
JP2003193081A (en) * 2001-10-16 2003-07-09 Nsk Ltd Grease composition and rolling device
JP2003193080A (en) * 2001-10-16 2003-07-09 Nsk Ltd Grease composition for rolling bearing and rolling bearing
JP2005054007A (en) * 2003-08-08 2005-03-03 Cosmo Sekiyu Lubricants Kk Grease composition

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63108098A (en) * 1986-10-24 1988-05-12 Kyodo Yushi Kk Heavy load resistant grease composition
JPH0218497A (en) * 1988-07-07 1990-01-22 Kyodo Yushi Kk High-load-resistant grease composition
JP2006029473A (en) * 2004-07-16 2006-02-02 Nsk Ltd Angular ball bearing and machine tool
JP2006265343A (en) * 2005-03-23 2006-10-05 Nsk Ltd Antifriction bearing
JP2008074978A (en) * 2006-09-21 2008-04-03 Showa Shell Sekiyu Kk Urea grease composition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020050337A1 (en) 2018-09-07 2020-03-12 Ntn株式会社 Rolling bearing and spindle device equipped with rolling bearing
KR20210044827A (en) 2018-09-07 2021-04-23 엔티엔 가부시키가이샤 Rolling bearings and spindle units equipped with the rolling bearings

Also Published As

Publication number Publication date
KR101610979B1 (en) 2016-04-08
DE112009001169T5 (en) 2011-04-28
DE112009001169B4 (en) 2020-02-20
KR20110021896A (en) 2011-03-04
TWI434925B (en) 2014-04-21
WO2009139371A1 (en) 2009-11-19
JP5346491B2 (en) 2013-11-20
CN102027102A (en) 2011-04-20
TW201011102A (en) 2010-03-16
CN102027102B (en) 2013-12-11

Similar Documents

Publication Publication Date Title
JP5916781B2 (en) Rolling bearing
JP5346491B2 (en) Grease for high speed bearings
JP4461720B2 (en) Lubricant composition
TWI454568B (en) High-speed bearings with lubricating oil and high-speed rolling bearings
TWI524014B (en) High-speed bearings with lubricating oil and high-speed rolling bearings
JP5115050B2 (en) Rolling bearing
JP2009121532A (en) Rolling bearing for high speed
JP5305600B2 (en) Grease for high-speed bearings and rolling bearings for spindles
JP2010059369A (en) Grease composition, roller bearing and universal joint with the grease composition sealed therein
JP2009121531A (en) Rolling bearing for high speed
JP2008222793A (en) Grease for high-speed bearing and rolling bearing for spindle
JP2009209990A (en) Grease filled bearing for motor
JP2009019750A (en) Rolling bearing for high speed
JP2009036222A (en) High-speed rolling bearing
JP2009036221A (en) High-speed rolling bearing
JP6461520B2 (en) Rolling bearings for machine tools
JP2004176774A (en) Rolling device
JP2008286373A (en) Rolling bearing for high speed
JP2008286372A (en) Rolling bearing for high speed
JP2004339270A (en) Grease composition, roller bearing, roller bearing device, and rolling device
JP2009008209A (en) High-speed rolling bearing
JP2003083341A (en) Rolling bearing
JP2003277780A (en) Biodegradable grease composition and rolling device
JP2009204126A (en) One-way clutch incorporation type rotation transmission device
JP2006199771A (en) Grease composition and rolling bearing for use in machine tool axle

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20110426

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20130507

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20130708

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20130730

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20130819

R150 Certificate of patent or registration of utility model

Ref document number: 5346491

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250