CN103540390A - Lubricating oil composition for fluid dynamic bearing and motor for hdd fabricated using the same - Google Patents

Lubricating oil composition for fluid dynamic bearing and motor for hdd fabricated using the same Download PDF

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CN103540390A
CN103540390A CN201310218429.3A CN201310218429A CN103540390A CN 103540390 A CN103540390 A CN 103540390A CN 201310218429 A CN201310218429 A CN 201310218429A CN 103540390 A CN103540390 A CN 103540390A
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lubricating oil
oil composition
motor
aliphatic monocarboxylic
hydrodynamic bearing
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金亨奎
郑夏龙
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Samsung Electro Mechanics Co Ltd
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Samsung Electro Mechanics Co Ltd
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    • 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
    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
    • 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
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/34—Esters of monocarboxylic acids
    • 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
    • C10M169/04—Mixtures of base-materials and additives
    • 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
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
    • 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
    • C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
    • C10M2207/2815—Esters of (cyclo)aliphatic monocarboxylic acids 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
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C10M2207/2825—Esters of (cyclo)aliphatic oolycarboxylic acids 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • 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
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/041—Triaryl phosphates
    • 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
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/04—Groups 2 or 12
    • 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
    • C10N2020/071—Branched chain compounds
    • 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
    • C10N2030/02—Pour-point; 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
    • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
    • 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
    • C10N2030/74—Noack Volatility
    • 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
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/18—Electric or magnetic purposes in connection with recordings on magnetic tape or disc

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Sliding-Contact Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Lubricants (AREA)

Abstract

There are provided a lubricating oil composition for a fluid dynamic bearing and a motor for a hard disk drive (HDD), the lubricating oil composition including, as a base oil, an aliphatic monocarboxylic acid ester having a total of between 16 to 46 carbon atoms, obtained by an esterification reaction of carboxylic acid represented by Chemical Formula 1 below and a primary or a secondary alcohol having between 8 to 38 carbon atoms, and thus, the motor for an HDD is fabricated using the lubricating oil composition for a fluid dynamic bearing having low viscosity, low evaporation loss, and improved oxidation stability at a practicable temperature, thereby preventing a deterioration in product reliability due to long-time use of the motor.(Formula 1).

Description

For the lubricating oil composition of hydrodynamic bearing and the motor for hard disk drive that uses said composition to manufacture
The cross reference of related application
The application requires the right of priority of in July, the 2012 Korean Patent Application No. 10-2012-0076020 that 12 Korea S Department of Intellectual Property submits to, and the disclosure of this korean patent application is incorporated in the application by reference.
Technical field
The present invention relates to there is low viscosity, the lubricating oil composition for hydrodynamic bearing of the oxidative stability of low vaporization losses and raising, and the motor for hard disk drive (HDD) that uses said composition to manufacture.
Background technology
Hard disk drive (HDD) is a kind of information storing device, and it uses read/write head read the data that are stored on disk or data are write in disk.
HDD needs to drive the disk drive of disk, and disk drive adopts undersized spindle motor.
In this undersized spindle motor, use hydrodynamic bearing assembly.Lubricating fluid is placed between the axle and sleeve of hydrodynamic bearing assembly, to the hydrodynamicpressure that axle produces in lubricating fluid is supported.
In the situation that the viscosity of lubricating fluid is high at low temperatures during spindle motor rotation, the viscous resistance to the increase of dynamic electricity generation groove in lubricating fluid producing during motor rotation, causes the power loss in motor to increase.
On the other hand, during motor rotation, in high-temperature zone lubricating fluid thermal expansion and its reduced viscosity in the situation that, lubricating fluid can not be brought into play supporting role fully.
For this reason, need lubricating fluid to there is conflicting viscosity behavior feature, wherein, in cold zone, keep low viscosity and do not reduce in high-temperature zone medium viscosity.
For meeting these viscosity characteristics, developed multiple technologies, for example, using Material Additions such as antioxidant or extreme-pressure additive to containing certain esters compound in the base oil of main ingredient.
The lubricating fluid that contains above-mentioned additive demonstrates the effect of expectation when electrical machinery life starts, but when lubricating fluid is used the long period, lubricant may be evaporated and its viscosity characteristics may change, and therefore may be difficult to continue to keep the effect of expectation.
In addition, along with the trend of motor miniaturization, high precision, high speed rotating and the low power consumption of disk drive, need lubricating fluid to have such as heat-resisting, oxidative stability, low evaporation and the feature such as anti-wear.
Meanwhile, in the situation that the reduced viscosity of base oil, its vaporization losses often increases.Therefore, need under actual temperature, there is low viscosity but suppress the base oil of vaporization losses.
Following correlation technique document discloses the grease composition that contains 2 ethyl hexanoic acid.Yet although described grease composition has low viscosity under actual temperature, its vaporization losses is not significantly suppressed.
[correlation technique document]
The open application number 2007-154032 of (patent documentation 1) Japanese Patent Laid
Summary of the invention
An aspect of of the present present invention provide there is low viscosity, the lubricating oil composition for hydrodynamic bearing of the oxidative stability of low vaporization losses and raising, and the motor for hard disk drive (HDD) that uses said composition to manufacture.
According to an aspect of the present invention, be provided for the lubricating oil composition of hydrodynamic bearing, described lubricating oil composition contain there is 16-46 carbon atom altogether aliphatic monocarboxylic acid ester as base oil, described aliphatic monocarboxylic acid ester by the carboxylic acid that represented by following Chemical formula 1 with there is the primary alconol of 8-38 carbon atom or the esterification of secondary alcohol obtains.
[Chemical formula 1]
Figure BDA00003300081200031
Described aliphatic monocarboxylic acid ester can be thylhexoic acid palmityl ester (palmityl ethylhexanoate) or thylhexoic acid hexadecyl ester (cetyl ethylhexanoate).
Described lubricating oil composition can further contain the oil antioxidant of 0.01-2 weight part, and described oil antioxidant can be 2,2 '-methylene radical-bis-(4-methyl-6-tert-butylphenols).
Described lubricating oil composition can further contain the metal oxidation resistance agent of 0.01-2 weight part, and described metal oxidation resistance agent can be diphenylamine-4-barium sulfonate.
Described lubricating oil composition can further contain the stiffling preparation of 0.01-2 weight part, and described stiffling preparation can be Tritolyl Phosphate.
According to a further aspect in the invention, be provided for the motor of hard disk drive (HDD), described motor comprises the lubricating oil composition for hydrodynamic bearing, described lubricating oil composition contain there is 16-46 carbon atom altogether aliphatic monocarboxylic acid ester as base oil, described aliphatic monocarboxylic acid ester by the carboxylic acid that represented by following Chemical formula 1 with there is the primary alconol of 8-38 carbon atom or the esterification of secondary alcohol obtains.
[Chemical formula 1]
Figure BDA00003300081200032
Described aliphatic monocarboxylic acid ester can be thylhexoic acid n-Hexadecane-7-base ester (hexadecan-7-yl-ethylhexanoate).
The oil antioxidant that can further contain 0.01-2 weight part for the described lubricating oil composition of hydrodynamic bearing, and described oil antioxidant can be 2,2 '-methylene radical-bis-(4-methyl-6-tert-butylphenols).
For the described lubricating oil composition of hydrodynamic bearing, can further contain the metal oxidation resistance agent of 0.01-2 weight part, and described metal oxidation resistance agent can be diphenylamine-4-barium sulfonate.
The stiffling preparation that can further contain 0.01-2 weight part for the described lubricating oil composition of hydrodynamic bearing, and described stiffling preparation can be Tritolyl Phosphate.
Accompanying drawing explanation
According to following detailed description, will more clearly understand above-mentioned and other side, feature and other advantage of the present invention by reference to the accompanying drawings, wherein:
Fig. 1 is the cross sectional representation showing for the motor of hard disk drive (HDD), and described motor comprises hydrodynamic bearing assembly according to the embodiment of the present invention.
Embodiment
Hereinafter, with reference to accompanying drawing, describe embodiments of the present invention in detail.Yet the present invention can implement in many different forms, and the present invention should be interpreted as and be limited to embodiment as herein described.On the contrary, provide these embodiments to be intended to make present disclosure thorough and complete, and pass on scope of the present invention to those skilled in the art comprehensively.
In the accompanying drawings, for clarity sake, shape and size that can amplifier element, and will indicate same or similar element with identical Reference numeral in the whole text.
Fig. 1 is the cross sectional representation showing for the motor of hard disk drive (HDD), and described motor comprises hydrodynamic bearing assembly according to the embodiment of the present invention.
With reference to figure 1, the lubricating oil composition 170 for hydrodynamic bearing according to the embodiment of the present invention can contain there is 16-46 carbon atom altogether aliphatic monocarboxylic acid ester as base oil, described aliphatic monocarboxylic acid ester by the carboxylic acid that represented by following Chemical formula 1 with there is the primary alconol of 8-38 carbon atom or the esterification of secondary alcohol obtains.
[Chemical formula 1]
Hereinafter, will describe above-mentioned formation in detail.
The carboxylic acid being represented by Chemical formula 1 can be 2 ethyl hexanoic acid.
Meanwhile, according to the embodiment of the present invention, alcohol can be for having the primary alconol of 8-38 carbon atom or secondary alcohol to carry out esterification with the carboxylic acid shown in Chemical formula 1, but described alcohol is not limited to this.
The lubricating oil composition 170 for hydrodynamic bearing according to the embodiment of the present invention can contain carboxylic acid by being represented by following Chemical formula 1 with the aliphatic monocarboxylic acid ester with the primary alconol of 8-38 carbon atom or the acquisition of the esterification of secondary alcohol as base oil.
Described aliphatic monocarboxylic acid ester can have, but is not limited to, for example, and 16-46 carbon atom altogether.
Described aliphatic monocarboxylic acid ester can be, but is not limited to, for example, and the thylhexoic acid palmityl ester or the thylhexoic acid hexadecyl ester that by following Chemical formula 2 or chemical formula 3, are represented.
[Chemical formula 2]
Figure BDA00003300081200052
[chemical formula 3]
Figure BDA00003300081200061
Particularly, Chemical formula 2 represents thylhexoic acid palmityl ester, and chemical formula 3 represents thylhexoic acid hexadecyl ester.
The lubricating oil composition 170 for hydrodynamic bearing according to the embodiment of the present invention can have the oxidative stability of low viscosity, low vaporization losses and excellence by containing by 2 ethyl hexanoic acid and the aliphatic monocarboxylic acid ester with the primary alconol of 8-38 carbon atom or the acquisition of the esterification of secondary alcohol as base oil.
The kinematic viscosity of aliphatic monocarboxylic acid ester according to the embodiment of the present invention can be measured with-20 ℃, 25 ℃ together with viscosity at the temperature of 85 ℃.
Can be by measuring viscosity with Brookfield DB-III rheometer viscometer, and can for each component three humidity provinces (20 ℃, 25 ℃ and 85 ℃) measure viscosity to detect each component with respect to the viscosity profile of temperature.
In the general test of motor reliability, in described three temperature ,-20 ℃ corresponding to low temperature electric machine storage-temp, and 25 ℃ corresponding to room temperature motor operation temperature, and 85 ℃ corresponding to high-temperature electric machine service temperature.
According to the embodiment of the present invention, described aliphatic monocarboxylic acid ester is compared and at high temperature can be had lower viscosity and lower rate of evaporation with normally used aliphatic monocarboxylic acid esters such as Octyl adipate (DOA), dioctyl sebacate (DOS) or dioctyl azelate (DOZ).
Therefore, use described aliphatic monocarboxylic acid ester as base oil more effectively the frictionloss in reduction equipment induce low viscosity simultaneously, and because its low evaporation improves stability at high temperature.
Comprise described aliphatic monocarboxylic acid ester and go for as the lubricating oil composition of base oil, but be not limited to this, for example, for the hydrodynamic bearing of the motor of hard disk drive (HDD).
For small size HDD, it needs low watt consumption, and stability at high temperature because of the high speed rotating of motor may be very important factor.
Lubricating oil composition according to the embodiment of the present invention has satisfactory stability under low frictionloss and high temperature, and therefore can meet the above-mentioned condition of small size HDD.
The oil antioxidant that can further contain 0.01-2 weight part for the described lubricating oil composition of hydrodynamic bearing, and described oil antioxidant can be, but be not limited to 2,2 '-methylene radical-bis-(4-methyl-6-tert-butylphenol).
Described lubricating oil composition can contain the described oil antioxidant of 0.01-2 weight part, and in this content range, the performance of described lubricating oil composition can not worsen.If the content of described oil antioxidant is lower than 0.01 weight part, the interpolation of described oil antioxidant is not too effective, and if the content of described oil antioxidant higher than 2 weight parts, the performance of described lubricating oil composition may worsen.
In addition, for the described lubricating oil composition of hydrodynamic bearing, can further contain the metal oxidation resistance agent of 0.01-2 weight part, and described metal oxidation resistance agent can be, but be not limited to, for example, diphenylamine-4-barium sulfonate.
If the addition of described metal oxidation resistance agent is lower than 0.01 weight part, oxidative stability effect is not too effective, if but the addition of described metal oxidation resistance agent higher than 2 weight parts, the performance of described lubricating oil composition may worsen.
The stiffling preparation that can further contain 0.01-2 weight part for the described lubricating oil composition of hydrodynamic bearing, and described stiffling preparation can be, but be not limited to, for example, Tritolyl Phosphate.
If the addition of described stiffling preparation is lower than 0.01 weight part, stiffling effect processed is not too effective, if but the addition of described stiffling preparation higher than 2 weight parts, the performance of described lubricating oil composition may worsen.Therefore, the addition of described stiffling preparation can be in the scope of 0.01-2 weight part.
According to the motor for HDD of another embodiment of the present invention, can comprise the lubricating oil composition for hydrodynamic bearing, described lubricating oil composition contain there is 16-46 carbon atom altogether aliphatic monocarboxylic acid ester as base oil, described aliphatic monocarboxylic acid ester by the carboxylic acid that represented by following Chemical formula 1 with there is the primary alconol of 8-38 carbon atom or the esterification of secondary alcohol obtains.
[Chemical formula 1]
Figure BDA00003300081200081
Hereinafter by the motor for HDD describing in detail according to another embodiment of the present invention, and will omit the description overlapping with above-mentioned embodiment of the present invention.
For the motor 400 for HDD, oil seal part 160 can be formed on stationary member 120 and 140 and rotor component 110,130 and 212 between, and especially, can be formed between sleeve 120, thrust plate 130 and cap 140.
Cap 140 is to lubricating fluid is sealed in to the member between cap 140 and thrust plate 130 from the top press-fit of thrust plate 130.Can form circumferential slot in its external diameter direction, to cap 140 is force-fitted on thrust plate 130 and sleeve 120.
Cap 140 can have the prodger that forms in its lower surface so that sealing lubricating oil, and described prodger utilizes the capillarity of lubricating fluid and surface tension to prevent that lubricating fluid leaks into outside when motor drives.
Meanwhile, according to the motor 400 for HDD of another embodiment of the present invention, can comprise axle 110, sleeve 120, thrust plate 130, cap member 140 and oil seal part 160.
Sleeve 120 can back shaft 110 so that the upper end edge axial direction due of axle 110 projects upwards, and sleeve 120 can form by forging Cu or Al or powdered alloy or the powder based on SUS of sintering based on Cu-Fe.
Herein, axle 110 inserts in the axis hole hole of sleeve 120, makes to have microgap therebetween.Lubricating fluid is filled described microgap, and at least one of the external diameter of axle 110 and the internal diameter of sleeve 120, forms radial dynamic pressure groove and carry out the rotation of support rotor 200 more reposefully.
Radial dynamic pressure groove can be formed in the internal surface of sleeve 120, the inside in the axis hole hole of sleeve 120, and produces amesiality pressure during axle 110 rotations.
Yet, it should be noted that radial dynamic pressure groove is not limited to be provided at as described above in the internal surface of sleeve 120, but for example, may be provided in the outer radius portion of axle 110, and the quantity of radial dynamic pressure groove is unrestricted.
Sleeve 120 can have by-pass channel 125, described by-pass channel 125 communicates with each other the top part of sleeve 120 and bottom part, distribute thus and the pressure of balance lubricating fluid in hydrodynamic bearing assembly 100, and via loopy moving and discharge bubble or the analogue existing in hydrodynamic bearing assembly 100.
Herein, cover plate 150 can with the bottom partial coupling of sleeve 120, to keep the gap between sleeve 120 and cover plate 150, and lubricating oil is contained in described gap.
Because contain lubricating oil in the gap between cover plate 150 and sleeve 120, cover plate 150 can be used as the bearing of the lower surface of back shaft 110.
Thrust plate 130 be in axial direction arranged on sleeve 120 above, and heart place comprises the hole corresponding to the cross section of axle 110 therein.Axle 110 can insert in described hole.
Herein, can manufacture separately thrust plate 130, and be coupled to subsequently axle 110, but also can form as a whole with axle 110.Thrust plate 130 can be followed axle 110 rotations during axle 110 rotations.
In addition, can in the upper surface of thrust plate 130, form thrust dynamic pressure grooves, to provide thrust dynamic pressure to axle 110.
Thrust dynamic pressure grooves is not limited to be formed on as described above in the upper surface of thrust plate 130, but can be formed in the upper surface corresponding to the sleeve 120 of the lower surface of thrust plate 130.
Stator 300 can comprise coil 320, core 330 and base component 310.
In other words, stator 300 can be fixed sturcture, and it is included in coil 320 and a plurality of core being wound around by coil 320 330 that produces the electromagnetic force with pre-sizing while applying power.
Core 330 can be fixed to the top part of base component 310, and described base component 310 comprises the printed circuit board (PCB) (not shown) of printed circuit pattern in the above.A plurality of coil hole with predetermined size were pierced the upper surface corresponding to winding around 320 of base component 310, and winding around 320 is exposed downwards.Winding around 320 can be electrically connected to described printed circuit board (PCB) (not shown) to its supply external power.
Base component 310 is press-fitted to merge and is fixed to the outer circumferential surface of sleeve 120, and the core 330 being wound around by coil 320 can insert wherein.
In addition, can make by the outside surface applied adhesives of the internal surface to base component 310 and sleeve 120 base component 310 and sleeve 120 coupled to each other.
The rotational structure with respect to stator 300 rotations that rotor 200 is to provide, rotor 200 can comprise rotor shell (rotor case) 210, described rotor shell 210 has the toroidal magnet 220 forming in its outer circumferential surface, described magnet with predetermined distance towards core 330.
In addition, magnet 220 can be permanent magnet, and its N utmost point and the S utmost point, with circumferential direction alternating magnetization, produce the magnetic force with pre-sizing thus.
Herein, rotor shell 210 can merge the hub base (hub base) 212 of the upper end that is fixed to axle 110 and along external diameter direction from hub base 212, extends and be in axial direction bent downwardly so that the magnet support part of support magnet 220 214 forms by being press-fitted.
According to the motor for HDD of another embodiment of the present invention, comprise the lubricating oil composition for hydrodynamic bearing, more effectively the frictionloss in reduction equipment has low viscosity simultaneously thus, and because low evaporation realizes stability excellent under high temperature.
In addition, the lubricating oil composition for hydrodynamic bearing that is used in the oxidative stability under actual temperature with low viscosity, low vaporization losses and raising is manufactured the motor for HDD, prevents thus the deterioration of the product reliability that the life-time service due to motor causes.
Except the inclusion of the lubricating oil composition 170 for hydrodynamic bearing, the method for manufacturing the motor 400 that is used for HDD can be identical with general manufacture method.
Hereinafter, with reference to embodiment, describe the present invention in detail, but the present invention is not limited to this.
(embodiment of the present invention 1)
In the embodiment of the present invention 1, the 2 ethyl hexanoic acid and the n-Hexadecane-7-alcohol (hexadecan-7-ol) that are purchased are reacted each other, so that thylhexoic acid n-Hexadecane-7-base ester of synthetic following chemical formula 4 from suppliers such as Aldrich, Merck, TCI.
[chemical formula 4]
Figure BDA00003300081200111
Above-mentioned alcohol and acid are placed in to reactor, and react 24 hours at the temperature of 200 ℃.After reaction, carry out purge process.
Thylhexoic acid n-Hexadecane-7-base ester accounts for approximately 95 % by weight of gross weight, and accounts for 5 other % by weight for improving the additive of further feature.
Particularly, add that 2,2 of 2 % by weight '-methylene radical-bis-(4-methyl-6-tert-butylphenols) are anti-oxidant for oil, and the Tritolyl Phosphate that adds 2 % by weight is as stiffling preparation.
In addition, the diphenylamine-4-barium sulfonate that adds 1 % by weight is anti-oxidant for the metallic surface that contacts with oil.
(comparing embodiment 1 and 2)
In comparing embodiment 1, as in the embodiment of the present invention 1, by the additive of 5 % by weight being added in the mixture of the dioctyl sebacate (DOS) of 65 % by weight and the oleic acid (ethyl hexyl) ester (EHO) of 30 % by weight, prepare lubricating oil composition.In comparing embodiment 2, by the method identical with the embodiment of the present invention 1, prepare lubricating oil composition, different, use the Octyl adipate (DOA) of the amount of approximately 95 % by weight account for gross weight.
Comparing embodiment 1 and 2 ester can be represented by following chemical formula 5 and 6:
[chemical formula 5]
Figure BDA00003300081200121
[chemical formula 6]
Figure BDA00003300081200122
Following table 1 shows to be measured for the viscosity of the performance of lubricating oil composition relatively and evaporation level so that the reliability between the comparison embodiment of the present invention and comparing embodiment.
With Brookfield DB-III rheometer viscometer, measure viscosity, and for each component three humidity provinces (20 ℃, 25 ℃ and 85 ℃) measure viscosity so that according to the viscosity profile of each component of temperature detection.
By following experiment, measure steam output: the lubricating oil composition for hydrodynamic bearing that 5g is contained to each component is placed in the furnace pot based on SUS of being made by SUS material, be introduced into subsequently in the thermostatted of 100 ℃.
Test 144 hours (6 days), and by mensuration be placed in the initial weight of the lubricating oil composition on furnace pot and at 100 ℃ the weight of the lubricating oil composition after 144 hours carry out comparison steam output.
[table 1]
Figure BDA00003300081200131
As can be seen from Table 1, compare with using the lubricating oil composition (comparing embodiment 1) of mixture and the lubricating oil composition (comparing embodiment 2) of use Octyl adipate (DOA) of the dioctyl sebacate (DOS) of 65 % by weight and the oleic acid 2-(ethyl hexyl) ester (EHO) of 30 % by weight, according to lubricating oil composition of the present invention (embodiment of the present invention 1), there is lower viscosity and lower steam output.
Therefore,, according to the present invention, by being included in the lubricating oil composition for hydrodynamic bearing of the oxidative stability under actual temperature with low viscosity, low vaporization losses and raising, manufacture HDD motor, the motor reliability while improving thus motor life-time service.
As described above, according to the embodiment of the present invention, use the lubricating oil composition for hydrodynamic bearing of the oxidative stability under actual temperature with low viscosity, low vaporization losses and raising to manufacture the motor for HDD, prevent thus the deterioration of the product reliability that the life-time service due to motor causes.
Although show in conjunction with embodiment and described the present invention, one skilled in the art will understand that and can within not deviate from the spirit and scope of the present invention that the claim of enclosing limits, modify and change.

Claims (16)

1. the lubricating oil composition for hydrodynamic bearing, described lubricating oil composition contain there is 16-46 carbon atom altogether aliphatic monocarboxylic acid ester as base oil, described aliphatic monocarboxylic acid ester by the carboxylic acid that represented by following Chemical formula 1 with there is the primary alconol of 8-38 carbon atom or the esterification of secondary alcohol obtains.
[Chemical formula 1]
Figure FDA00003300081100011
2. lubricating oil composition according to claim 1, wherein, described aliphatic monocarboxylic acid ester is thylhexoic acid palmityl ester or thylhexoic acid hexadecyl ester.
3. lubricating oil composition according to claim 1, wherein, described lubricating oil composition further contains the oil antioxidant of 0.01-2 weight part.
4. lubricating oil composition according to claim 3, wherein, described oil antioxidant is 2,2 '-methylene radical-bis-(4-methyl-6-tert-butylphenols).
5. lubricating oil composition according to claim 1, wherein, described lubricating oil composition further contains the metal oxidation resistance agent of 0.01-2 weight part.
6. lubricating oil composition according to claim 5, wherein, described metal oxidation resistance agent is diphenylamine-4-barium sulfonate.
7. lubricating oil composition according to claim 1, wherein, described lubricating oil composition further contains the stiffling preparation of 0.01-2 weight part.
8. lubricating oil composition according to claim 7, wherein, described stiffling preparation is Tritolyl Phosphate.
9. the motor for hard disk drive, described motor comprises the lubricating oil composition for hydrodynamic bearing, described lubricating oil composition contain there is 16-46 carbon atom altogether aliphatic monocarboxylic acid ester as base oil, described aliphatic monocarboxylic acid ester by the carboxylic acid that represented by following Chemical formula 1 with there is the primary alconol of 8-38 carbon atom or the esterification of secondary alcohol obtains.
[Chemical formula 1]
Figure FDA00003300081100021
10. motor according to claim 9, wherein, described aliphatic monocarboxylic acid ester is thylhexoic acid n-Hexadecane-7-base ester.
11. motors according to claim 9, wherein, further contain the oil antioxidant of 0.01-2 weight part for the described lubricating oil composition of hydrodynamic bearing.
12. motors according to claim 11, wherein, described oil antioxidant is 2,2
Figure FDA00003300081100022
2 methylene radical-bis-(4-methyl-6-tert-butylphenol).
13. motors according to claim 9, wherein, further contain the metal oxidation resistance agent of 0.01-2 weight part for the described lubricating oil composition of hydrodynamic bearing.
14. motors according to claim 13, wherein, described metal oxidation resistance agent is diphenylamine-4-barium sulfonate.
15. motors according to claim 9, wherein, further contain the stiffling preparation of 0.01-2 weight part for the described lubricating oil composition of hydrodynamic bearing.
16. motors according to claim 15, wherein, described stiffling preparation is Tritolyl Phosphate.
CN201310218429.3A 2012-07-12 2013-06-04 Lubricating oil composition for fluid dynamic bearing and motor for hdd fabricated using the same Pending CN103540390A (en)

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CN105523923A (en) * 2014-10-21 2016-04-27 Sk新技术株式会社 Method of producing estolide using linking agent
CN113195446A (en) * 2018-12-20 2021-07-30 新日本理化株式会社 Lubricating oil base oil for fluid dynamic bearing
CN113195446B (en) * 2018-12-20 2024-05-31 新日本理化株式会社 Lubricating oil base oil for hydrodynamic bearing

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EP3699168A1 (en) * 2014-02-18 2020-08-26 Elevance Renewable Sciences, Inc. Branched-chain esters and methods of making and using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105523923A (en) * 2014-10-21 2016-04-27 Sk新技术株式会社 Method of producing estolide using linking agent
CN113195446A (en) * 2018-12-20 2021-07-30 新日本理化株式会社 Lubricating oil base oil for fluid dynamic bearing
CN113195446B (en) * 2018-12-20 2024-05-31 新日本理化株式会社 Lubricating oil base oil for hydrodynamic bearing

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