CN104350136B - Lubricant composition, rolling bearing and variable-frequency motor - Google Patents

Lubricant composition, rolling bearing and variable-frequency motor Download PDF

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Publication number
CN104350136B
CN104350136B CN201380015306.8A CN201380015306A CN104350136B CN 104350136 B CN104350136 B CN 104350136B CN 201380015306 A CN201380015306 A CN 201380015306A CN 104350136 B CN104350136 B CN 104350136B
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China
Prior art keywords
frequency motor
variable
rolling bearing
lubricant composition
bearing
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CN201380015306.8A
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Chinese (zh)
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CN104350136A (en
Inventor
岩松宏树
土井理史
中野圭策
黑住诚治
从野知子
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/02—Mixtures of base-materials and thickeners
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
    • C10M2207/0406—Ethers; Acetals; Ortho-esters; Ortho-carbonates used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
    • C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C10M2207/2835—Esters of polyhydroxy compounds used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/10—Amides of carbonic or haloformic acids
    • C10M2215/102—Ureas; Semicarbazides; Allophanates
    • C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

Landscapes

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

Abstract

The present invention provides the lubricant composition in a kind of enclosed variable-frequency motor rolling bearing, and containing comprising the dynamic viscosity at 40 DEG C is 40~80mm2The thickener that the base oil of the alkyl diphenyl base ether oil of/s and the double urea compound obtained by reacting the mixed amine comprising ester ring type monoamine and aromatic series monoamine with diisocyanate cpd are constituted, needle penetration is 220~295, and thus can be made can steadily inhibit galvano-cautery and the excellent variable-frequency motor of low torque characteristics for a long time.

Description

Lubricant composition, rolling bearing and variable-frequency motor
Technical field
The present invention relates in enclosed variable-frequency motor rolling bearing lubricant composition, be sealed with the lubricant composition Variable-frequency motor rolling bearing and used the variable-frequency motor of the rolling bearing.
Background technique
In the past, as the fan motor of air-conditioning, it is common to use the control that can use voltage and frequency accurately adjusts The revolving speed of its rotary shaft or the variable-frequency motor of rotation speed.
Such variable-frequency motor known can generate following phenomenon, that is, flow through and come from the bearing being set in variable-frequency motor The high-frequency current of phase inverter generates potential difference (shaft voltage) between the outer ring and inner ring of bearing, when shaft voltage reaches enclosed axis It when holding the breakdown voltage of internal lubricant composition, will cause to discharge, generate the galvano-cautery of damage Bearing inner.This Outside, in the case where galvano-cautery aggravates, wavy abrasion will be generated in bearing inner race, bearing outer ring or bearing rotor (ball) Phenomenon and one of the main reason for have the case where generation for leading to abnormal sound, become the not good situation in variable-frequency motor.
So far, in order to inhibit galvano-cautery, considered countermeasure below.
(1) bearing inner race and bearing outer ring are set as on state.
(2) bearing inner race and bearing outer ring are set as state of insulation.
(3) shaft voltage is reduced.
As the specific method of above-mentioned (1), can enumerate by the way that the lubricant composition of bearing enclosed inside to be set as Electroconductive grease composition and prevent the electric discharge of Bearing inner, inhibit the method etc. of galvano-cautery.It is lubricated as such electric conductivity Oil/fat composition reported the composition for improving electric conductivity using the addition of defined carbon black or inorganic compound.For example, special It is recorded in sharp document 1, the electroconductive grease composition by that will contain defined carbon black encloses the gap of deep groove ball bearing The bearing for being difficult to generate galvano-cautery is made in portion.
But such electroconductive grease composition is with time going by, electric conductivity deteriorates, thus in the presence of that can not stablize Ground inhibits the problem of galvano-cautery for a long time, lacks the problem of sliding reliability.
In addition, the method as (1), it is also contemplated that the method that brush is set in rotary shaft and is set as on state, However this method also brush wear powder in need or the problems such as space for brush to be arranged.
As the specific method of above-mentioned (2), it can enumerate and the iron ball of Bearing inner is changed to dielectric ceramics The method of ball.The effect that the galvano-cautery of this method inhibits is very high, however has problem at high cost, can not be in general variable-frequency electric It is used in machine.
In addition, in patent document 2, recording following content, that is, by enclosed to meet defined dynamic viscosity Ester oil thickens the oil film of electrical insulating property as base oil, using lithium soap as the lubricating grease of thickener, so that electric current is difficult in bearing In flow through, although inexpensively, the damage as caused by galvano-cautery can be effectively avoided.But lubrication described in Patent Document 2 The insulation pressure resistance of rouge is not enough, and has room for improvement in terms of steadily inhibiting galvano-cautery for a long time.
As the specific method of above-mentioned (3), following method can be enumerated, that is, by by the stator iron of variable-frequency motor The made of metal bracket of the heart and electric conductivity or the grounding parts being grounded connect, to reduce shaft voltage.Although the galvano-cautery of this method The effect of inhibition is high, however needs the new space for being used to be arranged connection, thus the structure of motor is restricted.
On the other hand, it is known that the automobile electricity used under the harsh environment such as the high loading vibration environment of high temperature and high speed It fills in bearing used in component, auxiliary engine etc., is sealed with containing the base oil comprising alkyl diphenyl base ether oil and comprising double The lubricant composition of the thickener of carbamide compound.But in their use environment, do not account for for electrocorrosion-resisting And the countermeasure of low torque characteristics.Especially because not requiring low torque characteristics and low-temperature characteristics, therefore generally using at 40 DEG C Dynamic viscosity is 100mm2The alkyl diphenyl base ether oil of/s or more.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2008-180291 bulletin
Patent document 2: Japanese Unexamined Patent Publication 2006-153130 bulletin
Summary of the invention
Problem to be solved by the invention
The object of the present invention is to provide can steadily inhibit for a long time, galvano-cautery, furthermore low torque characteristics are excellent Lubricant composition in enclosed variable-frequency motor rolling bearing, the variable-frequency motor rotation axis for being sealed with the lubricant composition Hold and used the variable-frequency motor of the rolling bearing.
The method for solving problem
Lubricant composition in enclosed variable-frequency motor rolling bearing of the invention contains viscous comprising the dynamic at 40 DEG C Degree is 40~80mm2The base oil of the alkyl diphenyl base ether oil of/s and mixed comprising ester ring type monoamine and aromatic series monoamine comprising making Close the thickener of double urea compound obtained by amine react with diisocyanate cpd, needle penetration (mixing Chi ょ う degree) for 220~ 295。
In addition, variable-frequency motor rolling bearing of the invention is characterized in that, encloses the lubricant composition and formed.
In addition, variable-frequency motor of the invention is characterized in that, the rolling bearing is used.
The effect of invention
According to the present invention, by containing the base oil comprising the alkyl diphenyl base ether oil with defined dynamic viscosity and packet Needle penetration is set as 220~295 by the thickener containing defined double urea compound, so that it may be provided and steadily be inhibited electricity for a long time Burn into and lubricant composition in the excellent enclosed variable-frequency motor rolling bearing of low torque characteristics are sealed with the lubrication The variable-frequency motor rolling bearing of oil/fat composition and the variable-frequency motor for having used the rolling bearing.
Detailed description of the invention
Fig. 1 is the skeleton diagram for indicating the section of variable-frequency motor of an embodiment of the invention.
Fig. 2 is the section for indicating test variable-frequency motor used in shaft voltage measurement test and electrocorrosion-resisting test Skeleton diagram.
Fig. 3 is the skeleton diagram for indicating the section of device used in bearing loss performance test.
Specific embodiment
Firstly, (hereinafter also referred to as originally to the lubricant composition in enclosed variable-frequency motor rolling bearing of the invention The lubricant composition of invention) it is illustrated.
Lubricant composition in enclosed variable-frequency motor rolling bearing of the invention contains comprising alkyl diphenyl base ether oil Base oil and thickener comprising double urea compound.
Insulation resistance energy can be improved compared with other base oils such as ester oil, mineral oil in the alkyl diphenyl base ether oil. But although alkyl diphenyl base ether oil heat resistance used in the lubricant composition of bearing used in vehicle parts of electric etc. Can be excellent, however the dynamic viscosity at 40 DEG C is 100mm2/ s or more, there are the problems of low torque characteristics difference.Thus, at this In invention by using at 40 DEG C dynamic viscosity meet as defined in range alkyl diphenyl base ether oil, and make insulation resistance and Low torque characteristics improve.
Dynamic viscosity at 40 DEG C of the alkyl diphenyl base ether oil is 40mm2/ s or more, preferably 50mm2/ s or more, more Preferably 60mm2/ s or more.Dynamic viscosity at 40 DEG C is less than 40mm2In the case where/s, have the tendency that insulation reduce pressure, Lubricant composition is easy the trend from bearing internal leakage.In addition, the dynamic viscosity at 40 DEG C of alkyl diphenyl base ether oil is 80mm2/ s is hereinafter, preferably 75mm2/ s or less.Dynamic viscosity at 40 DEG C is greater than 80mm2In the case where/s, low torque characteristics It reduces, to have the tendency that bearing loss becomes larger.
The double urea compound is to make mixed amine and diisocyanate chemical combination comprising ester ring type monoamine and aromatic series monoamine Double urea compound obtained by object reaction.Especially the present invention is by being set as ester ring type monoamine and aromatic series for the amine for constituting mixed amine Electrocorrosion-resisting performance can be improved in monoamine.
As aromatic series monoamine, aniline, alkyl phenyl amine etc. can be enumerated.Wherein to environment friendly, availability, From the aspect of dispersed ideal, the alkyl phenyl amine that the carbon number of optimizing alkyl is 8~16, the carbon number of more preferable alkyl is 10~ 14 alkyl phenyl amine.In addition, the alkyl of the alkyl phenyl amine is either straight-chain is also possible to branched, in phenyl The position of substitution of alkyl can be any one of ortho position, meta position and contraposition.Specifically, for example, octyl aniline, Decyl aniline, dodecyl polyaniline, hexadecylaniline, Permethyl 99A base aniline etc..Especially in terms of favorable dispersibility Consider, more preferable pdodecyl benzeneamine.
As ester ring type monoamine, cyclohexylamine, alkyl amine etc. can be enumerated.Wherein from availability it is excellent from the aspect of It is preferred that cyclohexylamine.
For the mixing molar ratio (ester ring type monoamine: aromatic series monoamine) of ester ring type monoamine and aromatic series monoamine, from dispersion Property it is excellent from the aspect of, be preferably set to 60: 40~80: 20, from dispersibility it is more excellent from the aspect of, be more preferably set as 65 : 35~75: 25.
4,4 '-diisocyanate of diphenyl methane-, 2,4- toluene two can be enumerated as the diisocyanate cpd Isocyanates, 2,6- toluene di-isocyanate(TDI) etc..Wherein from availability it is excellent from the aspect of, preferred diphenyl methane -4,4 ' - Diisocyanate, 2,6- toluene di-isocyanate(TDI), further from the aspect of excellent heat resistance, preferred diphenyl methane -4, 4 '-diisocyanate.
Mixed amine can be carried out with reacting for diisocyanate cpd under various method and conditions, however due to can be with The uniformly dispersed high double urea compound of thickener is obtained, therefore is carried out preferably in base oil.In addition, reaction either to Addition has been dissolved the base oil of diisocyanate cpd and has been carried out in base oil dissolved with mixed amine, alternatively, it is also possible to dissolution There is addition in the base oil of diisocyanate cpd to dissolve the base oil of mixed amine and carried out.
Temperature and time in the reaction is not particularly limited, can be identical as common this kind of reaction.From mixed amine And diisocyanate dissolubility, it is volatile from the aspect of, reaction temperature is preferably 60~170 DEG C.From making mixed amine and two Isocyanates reaction complete aspect and by shortening manufacturing time bring efficient activity from the aspect of, the reaction time is excellent It is selected as 0.5~2.0 hour.In addition, the reacting for isocyanate group due to the amino and diisocyanate cpd of mixed amine is determined Amount ground carries out, therefore it is 1 mole that their ratio, which is preferably set to the diisocyanate cpd for 2 moles of mixed amine,.
The mixture that obtained double urea compound is the double urea compound comprising following compound is reacted using described, that is, Double urea compound (a) obtained by two isocyanate group of diisocyanate cpd are reacted with the ester ring type amine in mixed amine； Double urea compound (b) obtained by two isocyanate group of diisocyanate cpd are reacted with the aromatic amine in mixed amine； And obtained by a side of the isocyanate group of diisocyanate cpd reacts with ester ring type amine, another party reacts with aromatic amine Double urea compound (c).Moreover, also including by being respectively synthesized the allophanamide in double urea compound used in the present invention Close double urea compound object (a)~(c) and be obtained by mixing them.
The content of the thickener is 13~17 mass % preferably in the total amount of base oil and thickener, more preferably 14 ~16 mass %.In the case where the content of thickener is less than 13 mass %, it is difficult to be set as the needle penetration of lubricant composition 295 hereinafter, form soft lubricant composition, therefore have the trend being easy from bearing internal leakage.In addition, containing in thickener In the case that amount is greater than 17 mass %, it is difficult to the needle penetration of lubricant composition are set as 220 or more, to have using position Torque increase trend, because mobility reduce due to make be sintered service life reduction trend.
In addition, lubricant composition of the invention can also be within the scope of the effect of the invention in right amount containing anti- Oxidant, extreme pressure agent, wear-resistant dose, dyestuff, tone stabilizer, tackifier, structural stabilizing agent, metal-inert agent, viscosity refers to The various additives such as number modifier, rust-inhibiting additive.In the case where containing these various additives, in lubricant composition Content to can be set to relative to 100 mass parts of total amount of base oil and thickener be 10 below the mass.Also, it is preferred that being free of There is the additive for assigning electric conductivity.
Lubricant composition of the invention is characterized in that, needle penetration is set as 220~295.In needle penetration greater than 295 In the case of, have the easy trend from bearing internal leakage of lubricant composition.In addition, in the case where needle penetration is less than 220, meeting Have the tendency that increasing using the torque at position, make the trend for being sintered service life reduction because mobility reduces.For particularly preferred Needle penetration, from the balance of bearing loss and electrocorrosion-resisting it is more excellent from the aspect of, be 235~265.
In the following, referring to attached drawing, to variable-frequency motor rolling bearing of the invention and the variable-frequency electric of the rolling bearing has been used The embodiment of machine is illustrated.Moreover, the present invention is not limited to embodiments described below.
Fig. 1 is the skeleton diagram for indicating the section of variable-frequency motor of an embodiment of the invention.Frequency conversion shown in Fig. 1 Motor 10 is equipped with rotor 12 in rotary shaft 11, is fixed with stator 13 in casing 14 face to face with rotor 12.In addition, this The variable-frequency motor of invention uses rolling bearing to be fixed in the flange part of casing 14 as rolling bearing 20A and 20B, by rotary shaft 11 in two ends of rotor 12 rotatably pivot suspension.
In addition, rolling bearing 20A and 20B are respectively provided with the outer ring 21 being fixed in casing 14；It practises physiognomy with the inner face of outer ring The inner ring 22 that be arranged over the ground, rotary shaft 11 is pressed into；And it can movably be arranged between outer ring 21 and inner ring 22 more A rotor 23.In addition, being sealed with grease composition of the invention in space between outer ring 21, inner ring 22 and rotor 23 Object.Moreover, the amount of the lubricant composition in enclosed rolling bearing can suitably become according to form, the size etc. of rolling bearing More, however it can be degree substantially as in the past.
As variable-frequency motor of the invention, the various motors of home-use electrification product etc. can be enumerated, however due to It is that can steadily inhibit galvano-cautery for a long time and low torque characteristics are excellent, bearing loss is few variable-frequency motor, therefore preferably Fan motor as idle call uses.
In addition, in the variable-frequency motor of the present application, by implement by the made of metal bracket of stator core and electric conductivity, Or the change for inhibiting galvano-cautery more for a long time can be made come the method for reducing shaft voltage in the grounding parts connection being grounded Frequency motor.
Hereinafter, using embodiment, the present invention will be described in more detail, however the present invention is not by these embodiments Any restriction.
Evaluation method is expressed as follows.
The measurement > of < needle penetration
According to JIS K2220-7, in the environment of 25 DEG C, make the circular cone being installed in consistency meter to test lubricating grease group It closes and is fallen in object, measure the depth (mm) entered with 5 seconds, by the value determined multiplied by 10 times, regard resulting value as needle In-degree.
< electrocorrosion-resisting tests >
The test rolling bearing 200 for being sealed with test lubricant composition is equipped on test change as shown in Figure 2 In frequency motor 100, motor is made to drive certain time with certain revolving speed, evaluates the generation of the abnormal sound as caused by galvano-cautery.It is right In evaluation result, being marked with zero for the abnormal sound as caused by galvano-cautery is generated by no, the use × label of abnormal sound will be produced.
The detailed condition that electrocorrosion-resisting is tested is expressed as follows.
Test bearing: single-groove grooved ball bearing (JIS bearing number: 608, internal diameter 8mm, outer diameter 22mm, width 7mm)
Grease-enclosed amount: about the 40% of bearing space volume
Variable-frequency motor is used in test
Room conditioning is with minitype air conditioner fan motor (variable-frequency motor)
Operating condition
Revolving speed: 1000rpm
Rotational time: 5000 hours
Temperature: 25 DEG C
< bearing loss performance test (low torque characteristics test) >
2 test rolling bearings 200 for being sealed with test lubricant composition are pressed into rotary shaft as shown in Figure 3 In 300, bearing loss when driving rotary shaft 300 with certain rotation speed is detected using torque detector.For bearing Loss, along with the requirement of the high efficiency of variable-frequency motor, it is desirable to small, preferably 0.5W or less be lost.Evaluation be by 0.5W with Under with zero label, will be greater than use × label of 0.5W.Moreover, bearing loss is small to show that low torque characteristics are excellent.
For the detailed conditions of bearing loss performance test, condition is expressed as follows.
Test bearing: single-groove grooved ball bearing (JIS bearing number: 608, internal diameter 8mm, outer diameter 22mm, width 7mm)
Grease-enclosed amount: about the 40% of bearing space volume
Operating condition
Revolving speed: 1000rpm
Temperature: 25 DEG C
< overall merit >
By electrocorrosion-resisting test and two of bearing loss performance test be evaluated as zero with zero label, will be at least any One side be × use × label.Overall merit is zero to show steadily to inhibit for a long time galvano-cautery, and bearing loss Performance (low torque characteristics) is excellent.
In the present embodiment, raw material below has been used.
Base oil
ADE1: the alkyl diphenyl base ether oil of Matsumura Oil Res Corp., dynamic viscosity (40 DEG C): 100mm2/s
ADE2: the alkyl diphenyl base ether oil of Matsumura Oil Res Corp., dynamic viscosity (40 DEG C): 30mm2/s
ADE3: ADE1 is mixed with ADE2 with mass ratio 45: 55, dynamic viscosity (40 DEG C): 70mm2/s
ADE4: ADE1 is mixed with ADE2 with mass ratio 25: 75, dynamic viscosity (40 DEG C): 55mm2/s
ADE5: ADE1 is mixed with ADE2 with 95: 5, dynamic viscosity (40 DEG C): 40mm2/s
By mineral oil/PAO:Exxon Mobil Corporation refined mineral oil (dynamic viscosity (40 DEG C): 110mm2/ s, viscosity index (VI): 96) with the synthetic hydrocarbon oil of Neste Oil (dynamic viscosity (100 DEG C): 6mm2/ s) with mass ratio 50 : 50 mixing, dynamic viscosity (40 DEG C): 55mm2/s
Ester oil: by the oily (dynamic viscosity (40 DEG C): 70mm of the dipentaerythritol of Nippon Steel Chemical Co., Ltd2/ s) and flower Polyalcohol ester oil (the dynamic viscosity (40 DEG C): 33mm of king's Co. Ltd. system2/ s) with the mixing of mass ratio 70: 30, dynamic viscosity (40 DEG C): 55mm2/s
Thickener
Amine
Ester ring type monoamine: cyclohexylamine (99.2g/mol)
Aromatic series monoamine: pdodecyl benzeneamine (261.45g/mol)
Aliphatic monoamine: octylame (129.24g/mol)
Diisocyanate cpd
Diisocyanate: 4,4 '-diisocyanate (250.25g/mol) of diphenyl methane-
Li soap
Li soap: 12- hydroxy lithium stearate
Examples 1 to 5, comparative example 1~9
Cooperate according to shown in table 1 and table 2, test profit is prepared using base oil, thickener and additive as raw material Grease composition.The evaluation has been carried out with lubricant composition to resulting test.Moreover, comparative example 9 is used as previous product Multemp SRL (the dynamic viscosity (40 DEG C): 25mm of Xietong Grease Co., Ltd is used2/ s) and evaluated.It will As a result it is shown in table 1 and table 2.
[table 1]
[table 1]
Table 1
[table 2]
[table 2]
Table 2
Symbol description
10 variable-frequency motors
11 rotary shafts
12 rotors
13 stators
14 casings
20A rolling bearing
20B rolling bearing
21 outer rings
22 inner rings
23 rotors

Claims (3)

1. the lubricant composition in a kind of enclosed variable-frequency motor rolling bearing, which is characterized in that contain:
It is 50~75mm comprising the dynamic viscosity at 40 DEG C2The base oil of the alkyl diphenyl base ether oil of/s and
Comprising making the mixed amine of the alkyl phenyl amine comprising ester ring type monoamine and atomic number of alkyl carbon 10~14 and being selected from by hexichol 4,4 '-diisocyanate of methylmethane-, 2,4- toluene di-isocyanate(TDI) and 2,6- toluene di-isocyanate(TDI) composition group in Diisocyanate cpd reaction obtained by double urea compound thickener, and the thickener is in base oil and thickener It is 14~16 mass % in total amount, ester ring type monoamine and the mixing molar ratio of aromatic series monoamine are in the double urea compound 60:40~80:20,
The needle penetration of lubricant composition in the enclosed variable-frequency motor rolling bearing is 220~295.
2. a kind of variable-frequency motor rolling bearing is sealed in enclosed variable-frequency motor rolling bearing described in claim 1 Lubricant composition.
3. a kind of variable-frequency motor, it uses variable-frequency motor rolling bearings as claimed in claim 2.
CN201380015306.8A 2012-03-23 2013-02-12 Lubricant composition, rolling bearing and variable-frequency motor Active CN104350136B (en)

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JP2012-068087 2012-03-23
JP2012068087A JP5990744B2 (en) 2012-03-23 2012-03-23 Grease composition, rolling bearing and inverter motor
PCT/JP2013/053202 WO2013140892A1 (en) 2012-03-23 2013-02-12 Grease composition, rolling bearing, and inverter motor

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JP3150787B2 (en) * 1992-09-07 2001-03-26 株式会社日本礦油 Grease composition for rotating machine bearings
JP3337593B2 (en) * 1995-06-22 2002-10-21 日本精工株式会社 Grease composition for rolling bearings
JP2003013973A (en) * 2001-06-28 2003-01-15 Ntn Corp Heat-resistant, high speed, and high-loaded rolling bearing and grease composition
CN101228362B (en) * 2005-10-27 2012-01-18 日本精工株式会社 Insulating rolling bearing for use in prevention of electric corrosion, method for manufacture thereof, and bearing device
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US8216985B2 (en) * 2007-04-27 2012-07-10 Ntn Corporation Grease composition and grease-enclosed bearing
JP5392595B2 (en) * 2008-04-08 2014-01-22 Ｎｔｎ株式会社 Rolling bearing for rotating greased outer ring
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