CN101144498A - Dynamic pressure bearing device, method of manufacturing the same, and motor using the same - Google Patents
Dynamic pressure bearing device, method of manufacturing the same, and motor using the same Download PDFInfo
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- CN101144498A CN101144498A CNA2007101535297A CN200710153529A CN101144498A CN 101144498 A CN101144498 A CN 101144498A CN A2007101535297 A CNA2007101535297 A CN A2007101535297A CN 200710153529 A CN200710153529 A CN 200710153529A CN 101144498 A CN101144498 A CN 101144498A
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- 239000000853 adhesive Substances 0.000 claims description 5
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- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
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- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 4
- 230000002411 adverse Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 208000034189 Sclerosis Diseases 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000008041 oiling agent Substances 0.000 description 2
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- 229910001369 Brass Inorganic materials 0.000 description 1
- 240000004859 Gamochaeta purpurea Species 0.000 description 1
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- 239000010951 brass Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
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- 239000010935 stainless steel Substances 0.000 description 1
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- Sliding-Contact Bearings (AREA)
- Mounting Of Bearings Or Others (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
A securing surface of a housing comprises a deformation region, which deforms radially outward by a predetermined quantity during press fitting of a thrust member, and another region. The deformation region has a tapered shape that gradually reduces in diameter in the downward direction, and is receded radially inward relative to the other region of the securing surface, by an amount equivalent to the amount of outward deformation thereof during press fitting. When the thrust member is press fitted into the inner periphery of a press fitting portion of the housing, the securing surface of the housing becomes substantially straight along entire axial region L thereof.
Description
The application is be on November 26th, 2003, denomination of invention the applying date for " Hydrodynamic bearing apparatus, its manufacture method and use the motor of this bearing means ", application number be dividing an application of 200310115470.4 Chinese invention patent application.
Technical field
The present invention relates to the motor of a kind of Hydrodynamic bearing apparatus and manufacture method thereof and this bearing means of use, this Hydrodynamic bearing apparatus is done to come rotatably back shaft element in order to non-contacting mode by the dynamic pressure of the lubricant oil that produces in the bearing play.This bearing means is suitable for use on the messaging device, comprise the disk set that is used for as HDD and FDD, the spindle motor that is used for the optical disk unit of CD-ROM, CD-R/RM, DVD-ROM/RAM etc. and is used for the magnetooptic disc device of MD, MO etc., multiaspect scanner electric in laser beam printer (LBP) perhaps is used for the micro-machine as the electrical equipment of axial flow fan.
Background technique
In above-mentioned various motors, except high running accuracy, also require such as high speed, low cost and generation performance than low noise.One of them construction package that determines these performance requirements is the bearing of support motor main shaft.In recent years, after deliberation or the actual hydraulic bearing that possesses good above-mentioned performance that uses be used as this bearing.
For example, be contained in as the Hydrodynamic bearing apparatus in the spindle motor of the disk drive of HDD and be provided with radial bearing part and thrust-bearing part, this radial bearing part is along radially with non-contact mode back shaft element rotatably, this thrust-bearing part along thrust direction with non-contact mode back shaft element rotatably.This radial bearing section construction becomes to have hydraulic bearing, wherein is provided with on the external peripheral surface of the inner circumferential surface of bearing housing or shaft element and is used for producing the groove (dynamic pressure generation groove) of dynamic pressure.This thrust-bearing part for example is constructed with hydraulic bearing, wherein dynamic pressure produce on the both ends of the surface of flange portion that groove is arranged on shaft element or be arranged on this both ends of the surface facing surfaces on the (end face of bearing housing for example, perhaps be fixed to the end face of the thrust component on the bearing support) (as an example, referring to Japanese patent gazette No.2002-061641).
Usually, bearing housing is fixed on the inner circumference of bearing support, and thrust component is fixed on the inner circumference of bearing support one end.In addition, in order to prevent to insert the oil leak in the inner space in the bearing support, hermetic unit is set through the other end of the bearing support of being everlasting.
In above-mentioned Hydrodynamic bearing apparatus, often use to press-fit as the method on the inner circumference that thrust component is fixed to bearing support one end.In addition, be pressed into after the thrust component, often Bond inserted this press fit part, thereby seal this press fit part with Bond from the outside of bearing support.Yet, being accompanied by this and press-fiting process, the presumptive area of the excircle of bearing support will stand outside dilatancy, and this will bring following problem.
For example, when this Hydrodynamic bearing apparatus is used for rotating when supporting above-mentioned arbitrary motor, usually closely be fixed on the inner circumference of support (holding member) with the excircle of Bond, and should consider that the adhesion strength that can obtain determines the axial dimension of adhesive segment of these two elements and the size in the gap that Bond is filled this bearing support.Yet, if in press-fiting in the process of thrust component, a part of bonding surface (fixed surface) of the excircle of bearing support stands dilatancy, so when this bearing means is fixed to the inner circumference of holding member, the gap that Bond is filled becomes inhomogeneous in the axial direction, and this will bring the potential decline of adhesion strength and the worry of potential generation resonance problem.
In addition, another kind may be by press-fiting the excircle of bearing support closely to be fixed on the inner circumference of support (holding member), though it is similar to top method, if but press-fiting in the process at thrust component, dilatancy is stood on a part of press fit surface (fixed surface) of the excircle of bearing support, so when this bearing means is pressed into the inner circumference of holding member, gap between them along axial will be no longer even, this will bring the potential decline of press fit intensity and the worry of potential generation resonance problem.
In addition, when employing press-fits method as fixing thrust component, may produce following problem.
Promptly, after processing, clean each construction package of this Hydrodynamic bearing apparatus to remove any tiny metal granule, the for example smear metal that during the processing of assembly, produces, yet in press-fiting in the process of thrust component, because the sliding friction between the excircle of thrust component and the inner circumferential portion of bearing support one end, for example may producing, the so tiny metal granule (hereinafter being called " abrasion particulate ") of wear particle enters bearing support.Enter any abrasion particulate in the bearing support and will invade bearing part in lubricant oil, thereby the performance or the life-span of bearing are caused adverse influence.
In addition, in above-mentioned Hydrodynamic bearing apparatus, bonding is fixed to method on the bearing support through being commonly used for bearing housing.In this case, for example in advance adhesive coated to the inner circumferential surface of bearing support, insert bearing housing in the bearing support then and be positioned on the precalculated position Bond sclerosis afterwards.Yet, amount according to coated Bond, in bearing housing inserts bearing support and bearing housing move in the process in precalculated position, along with the mobile excessive Bond of bearing housing can be applied to the front of bearing housing everywhere, thereby adverse influence is caused in the location of bearing housing or the performance of bearing.
For example, in the disclosed Hydrodynamic bearing apparatus of the document of Japanese patent gazette No.2002-061641, inner surface by an end face that makes bearing housing and the hermetic unit that is arranged on bearing support one end (collar portion) contacts and realizes the location of bearing housing with respect to bearing support, if yet the coating everywhere of generation excessive binder, so when bearing housing moves to its end position, Bond will be collected between the end face and sealing inner surface partly of bearing housing, thereby can not realize the accurate location of bearing housing with respect to bearing support.
In addition, the application's claimant has proposed the application (Japanese patent application No.2002-117297) of a relevant Hydrodynamic bearing apparatus, wherein on the external peripheral surface of bearing housing, form longitudinal fluting, and in the end face of bearing housing one end, form the cross groove that this longitudinal fluting is communicated with the inner circumferential surface of bearing housing, thereby form the circulation passage of the lubricant oil in the inner space of inserting bearing support.Yet in this Hydrodynamic bearing apparatus, the coating everywhere of excessive Bond may cause Bond to block cross groove.
Summary of the invention
An object of the present invention is to solve because the problems referred to above that the dilatancy of the fixed surface of the excircle of bearing support is brought, guarantee stationary state stable between bearing support and holding member, and can obtain the constant intensity that needs.
Another object of the present invention is to prevent piercing of above-mentioned abrasion particulate.
A further object of the present invention is the coating everywhere that prevents excessive binder, thereby avoids because the influence that the coating everywhere of excessive binder brings.
To achieve the above object, the invention provides a kind of Hydrodynamic bearing apparatus, it comprises: bearing support; Be fixed to the bearing housing on the inner circumference of bearing support; Shaft element with shaft portion and flange portion; Be fixed to the thrust component of bearing support one end; The radial bearing part, its be arranged between bearing housing and the shaft portion and the dynamic pressure effect by the lubricant oil that in the radial bearing gap, produces along radially supporting this shaft portion in non-contacting mode; And thrust-bearing part, it is arranged between bearing housing and thrust component and the flange portion, and the dynamic pressure effect by the lubricant oil that produces in the thrust-bearing gap is supported this flange portion along thrust direction in non-contacting mode, wherein this thrust component is fitted in the inner circumference the inside of the press fit part that is arranged at bearing support one end with predetermined magnitude of interference, the excircle of this bearing support has fixed surface, this fixed surface is along axially having predetermined length and closely being fixed on the inner circumference of holding member, this fixed surface has the deformed region of radial and outward deformation prearranging quatity in the process of press in of thrust component, and along with thrust component is in force-fitted state, this fixed surface is straight substantially shape in the axial direction along the whole axial length of this fixed surface.
In specification, the statement of " straight substantially in the axial direction shape " refers to that not only this fixed surface has the shape (fully straight shape) of same diameter along its whole axial length, but also the radius that refers to the whole deformed zone territory of this fixed surface or a part of deformed region falls into for example from-30 μ m (near straight shape) in the scope of+5 μ m with respect to the difference of other the regional radiuses except this deformed region.
According to this structure, when thrust component is in the press fit of bearing support part when press-fiting state, the fixed surface of bearing support is straight substantially shape in the axial direction along the whole axial length of this fixed surface, thereby when this fixed surface closely is fixed on the inner circumference of holding member, this stationary state is stable, and can obtain the constant intensity of needs.
In addition, in order to achieve the above object, the present invention also provides a kind of method of making Hydrodynamic bearing apparatus, and this Hydrodynamic bearing apparatus comprises: bearing support; Be fixed to the bearing housing on the inner circumference of bearing support; Shaft element with shaft portion and flange portion; Be fixed to the thrust component of bearing support one end; The radial bearing part, its be arranged between bearing housing and the shaft portion and the dynamic pressure effect by the lubricant oil that in the radial bearing gap, produces along radially supporting this shaft portion in non-contacting mode; And thrust-bearing part, it is arranged between bearing housing and thrust component and the flange portion and supports this flange portion along thrust direction in non-contacting mode by the dynamic pressure effect of the lubricant oil that produces in the thrust-bearing gap, the method comprising the steps of: the end at this bearing support forms the press fit part, and this thrust component is pressed in this press fit part with predetermined magnitude of interference; Form fixed surface on the excircle of this bearing support, this fixed surface is along axially having predetermined length and closely being fixed on the inner circumference of holding member; Make the deformed region of this fixed surface a certain amount of along radially inwardly reducing with respect to other zones of fixed surface, this deformed region is in the predetermined amount of radial and outward deformation in the process that press-fits of thrust component, the reduction of this deformed region equals its outside amount of deformation, and this thrust component is press-fited and is fixed to the inner circumference the inside of the press fit part of bearing support.
The deformed region of the fixed surface by making this bearing support radially inwardly reduces certain amount with respect to other zones of this fixed surface, this reduction equals its amount of outwards being out of shape in the process that press-fits at thrust component, when this thrust component is in force-fitted state, the fixed surface of this bearing support is straight substantially shape in the axial direction along its whole axial length, thereby when this fixed surface closely is fixed on the inner circumference of holding member, this stationary state is stable, and can obtain the constant intensity of needs.
According to said structure,, can adopt with Bond and fix, fix or use some other appropriate method to fix by press fit as the method for the inner circumference the inside that the fixed surface of the excircle of bearing support is fixed to holding member.In addition, the deformed region of the fixed surface of bearing support can be set, and this deformed region can form the taper that its diameter reduces gradually towards bearing support one end near the press fit the other end partly of bearing support.
In addition, in order to achieve the above object, the present invention also provides a kind of Hydrodynamic bearing apparatus, and it comprises: bearing support; Be fixed to the bearing housing on the inner circumference of bearing support; Shaft element with shaft portion and flange portion; Be fixed to the thrust component of the inner circumferential portion of bearing support one end; The radial bearing part, its be arranged between bearing housing and the shaft portion and the dynamic pressure effect by the lubricant oil that in the radial bearing gap, produces along radially supporting this shaft portion in non-contacting mode; And thrust-bearing part, it is arranged between bearing housing and thrust component and the flange portion and supports this flange portion along thrust direction in non-contacting mode by the dynamic pressure effect of the lubricant oil that produces in the thrust-bearing gap, wherein uses the Bond that is arranged between them that this thrust component is press-fited and is fixed on the inner circumferential portion of bearing support one end.
According to this structure, even produce the abrasion particulate in press-fiting in the process of thrust component, denuding particulate so also can bonded dose of collection, thereby when Bond hardens it is sealed in inside the Bond.As a result, can prevent to follow the press-fiting process of thrust component and denude piercing of particulate.In addition, in press-fiting in the process of this thrust component, Bond is also brought into play the effect of oiling agent, this means: not only can suppress to press-fit in the process generation of abrasion particulate, and make and press-fit operation and become easier.
When this thrust component carried out press fit, Bond is coated on the thrust component front everywhere along the direction that is pressed into phenomenon can take place.If the coating everywhere of Bond is very remarkable, Bond can far reach around near the place the shaft element so, thereby hinders the steady rotation of this shaft element.For fear of this phenomenon takes place, the interior tapered space that keeps Bond is preferably disposed on the excircle part of thrust component and between the inner circumferential portion of bearing support one end, and the press fit part of contiguous thrust component.By the capillarity in this interior tapered space, remain in this press fit part along being pressed into the Bond that direction is coated on the thrust component front everywhere, thereby prevent that Bond from flowing on the shaft element.In addition, as the result of the confining force effect of improving Bond, also can improve the effect of catching and seal the abrasion particulate with Bond.
Can form this interior tapered space by on the excircle of thrust component part and in the inner circumferential portion of bearing support one end at least one, the conical surface being set.Preferably on the excircle part of thrust component, this conical surface is set.
Except above-mentioned interior tapered space, in order to keep Bond, also can and outside cone space be set between the inner circumferential portion of bearing support one end, the press fit part of its contiguous thrust component in the bearing support outside in the excircle of thrust component part.After being pressed into this thrust component, the Bond that can use the capillarity of the cone space by the outside to keep seals this press fit part.If in the inner circumferential portion of bearing support one end, step part is set, this step part is positioned at outside cone space, and the outside towards bearing support, the amount that is retained in the Bond in this outside cone space so after thrust component is pressed into will increase, thereby can further improve the sealing effect of press fit.
By on the excircle of thrust component part and in the inner circumferential portion of bearing support one end at least one, the conical surface being set, can form this outside cone space.Preferably the outer circumference portion branch at thrust component is provided with the conical surface.
In addition, in order to achieve the above object, the present invention also provides a kind of method of making above-mentioned hydraulic bearing, and it comprises step: with adhesive coated on the inner circumferential portion of bearing support one end; With thrust component is pressed into the inner circumferential portion the inside that is positioned at bearing support one end that has applied Bond.
In addition, in order to achieve the above object, the present invention also provides a kind of Hydrodynamic bearing apparatus, and it comprises: bearing support; Be fixed to the bearing housing on the inner circumference of bearing support by Bond; Shaft element; The radial bearing part, its be arranged between bearing housing and the shaft element and the dynamic pressure effect by the lubricant oil that in the radial bearing gap, produces along radially supporting this shaft portion in non-contacting mode, the Bond storage of depression wherein is set between the external peripheral surface of the inner circumferential surface of bearing support and bearing housing.
According to this structure, even owing to using excessive binder to cause superfluous Bond, this superfluous Bond can be collected in the Bond storage of depression, thereby can prevent that the Bond that is coated with from causing adverse influence to the location of bearing housing and the performance of bearing everywhere.
This Bond storage can be formed in the external peripheral surface of the inner circumferential surface of bearing support or bearing housing.Mode of execution as an alternative, can with the corresponding position of the external peripheral surface of the inner circumferential surface of this bearing support and bearing housing on form relative sunk part, the sinking space that is formed by these two-part is used as the Bond storage.Preferably in the inner circumferential surface of bearing support, form the Bond storage.The Bond storage also can be arranged on a plurality of positions.
Though the preferred binder storage is the shape that narrows down gradually on two axial directions, have no particular limits for the shape of Bond storage.When bearing housing was inserted in the inner circumferential surface of bearing support, this Bond storage can be collected a large amount of Bonds of Duoing than actual superfluous Bond sometimes.Yet in this case, in time period between location of finishing bearing housing and Bond sclerosis, the Bond that is collected in any surplus in the Bond storage under capillarity can be along axial flow in the narrower part of this storage, and fills target fixed area (space between the inner circumferential surface of the external peripheral surface of bearing housing and bearing support).Therefore, the excessive or not enough problem of Bond in this fixed area can be avoided, stable stationary state can be obtained.
In addition, the present invention also provides a kind of Hydrodynamic bearing apparatus, and it comprises: bearing support; Be fixed to the bearing housing on the inner circumferential surface of bearing support; Shaft element with shaft portion and flange portion; Be arranged on the hermetic unit of bearing support one end; Be arranged on the thrust part of the bearing support the other end; The radial bearing part, its be arranged between bearing housing and the shaft portion and the dynamic pressure effect by the lubricant oil that in the radial bearing gap, produces along radially supporting this shaft portion in non-contacting mode; And thrust-bearing part, it is arranged between bearing housing and thrust part and the flange portion, and the dynamic pressure effect by the lubricant oil that produces in the thrust-bearing gap is supported this flange portion along thrust direction in non-contacting mode, wherein lubricant oil is filled in the inside, inner space of bearing support, and the inner surface of sealing part territory, lateral areas, footpath within it partly contacts internal side diameter zone at the end face of bearing housing one end, and the inner surface of sealing part is in its outside diameter zone, begin reduction from end face, thereby form sunk part at bearing housing one end.
According to this structure, the lubricant oil of inserting the inside, bearing support inner space can be in this inside, inner space circulation, and as its result, the lubricating oil pressure that can prevent in this inner space is the phenomenon of negative pressure at regional area, can solve relevant problem, the bubble of for example following the generation of negative pressure and producing, and owing to producing oil leak or the vibration that bubble causes.
In addition, under the situation on the inner circumferential surface that bearing housing is fixed to bearing support with Bond, even the coating everywhere of Bond takes place, so because in the outside diameter zone of the inner surface of sealing part with between the end face of bearing housing end, be provided with and have the sunk part that needs capacity, so the unlikely direction along radial groove of Bond flows.As a result, can avoid the situation of bonded dose of obstruction of radial groove to take place effectively.
Description of drawings
Fig. 1 is to use the sectional drawing of spindle motor of the messaging device of Hydrodynamic bearing apparatus of the present invention.
Fig. 2 is the sectional drawing of Hydrodynamic bearing apparatus according to an embodiment of the invention.
Fig. 3 (a) is the sectional drawing of bearing housing, and Fig. 3 (b) is the view of the lower end surface of expression bearing housing, and Fig. 3 (c) is the view of the upper-end surface of expression bearing housing.
Fig. 4 (a) is the view of the upper-end surface of expression thrust component, and Fig. 4 (b) is the sectional drawing of this thrust component.
Fig. 5 is near the press fit part of expression bearing support and near the sectional drawing that the part of (before this thrust component is pressed into) is amplified the deformed region of fixed surface.
Fig. 6 is near the press fit part of expression bearing support and near the sectional drawing that the part of (after this thrust component is pressed into) is amplified the deformed region of fixed surface.
Fig. 7 and Fig. 8 represent by the binder between the inner circumferential portion that is arranged in thrust component and bearing support bottom thrust component to be pressed into the situation of this inner circumferential portion, wherein Fig. 7 is the part amplification profile of the state after expression is coated to binder on the inner circumferential portion of bearing support bottom, and Fig. 8 is the sectional drawing that the part of the state after this thrust component of expression is pressed in the inner circumference of bearing support bottom is amplified.
Fig. 9 is the sectional drawing of expression according to another embodiment's Hydrodynamic bearing apparatus.
Embodiment
Being described below of embodiments of the invention.
Fig. 1 represents to be equipped with an example according to the spindle motor structure of the messaging device of the Hydrodynamic bearing apparatus 1 of present embodiment.This spindle motor is used on the disk drive device of HDD for example, and comprise: as the disk center (disk hub) 3 of rotor, be used for supporting the Hydrodynamic bearing apparatus 1 of disk center 3 rotations, be used for keeping the support 6 of Hydrodynamic bearing apparatus 1 as thrust member, and stator 4 and rotor magnet 5, they be arranged between disk center 3 and the support 6 and by be arranged between them predetermined gap toward each other.In this embodiment, disk center 3 is contained on the shaft element 2 of Hydrodynamic bearing apparatus 1.Stator 4 appends on the excircle of support 6, and rotor magnet 5 appends on the inner circumference at disk center 3, and stator 4 and rotor magnet 5 by described gap diametrically toward each other.For example, be fixed on the inner circumference of support 6 with the bearing support 7 of Bond Hydrodynamic bearing apparatus 1.Keep for example one or more dish D of disk by disk center 3.When stator 4 is connected power supply, rotor magnet 5 and stator 4 generation rotating magnetic fields interact with each other, thus disk center 3 and shaft element 2 rotate together.
Fig. 2 represents Hydrodynamic bearing apparatus 1.This Hydrodynamic bearing apparatus 1 comprises bearing support 7, is fixed to bearing housing 8 and thrust component 10 on the bearing support 7, and as the shaft element 2 of construction package.
The first radial bearing part R1 and the second radial bearing part R2 are arranged between the outer peripheral surface 2a1 of shaft portion 2a of the inner peripheral surface 8a of bearing housing 8 and shaft element 2, and along axially separated from one another.In addition, the first thrust-bearing part S 1 is arranged between the upper-end surface 2b1 of flange portion 2b of the lower end surface 8c of bearing housing 8 and shaft element 2, and the second thrust-bearing part S2 is arranged between the lower end surface 262 of the upper-end surface 10a of thrust component 10 and flange portion 2b.In order to be easy to describe, a side of thrust component 10 is called downside, and the opposite side of thrust component 10 is called upside.
For example, by the soft metal of for example brass or for example the resin material of thermoplastic resin form bearing support 7, and this bearing support comprises cylindrical side part 7b and the annulus hermetic unit 7a that extends radially inwardly integratedly from the upper end of this lateral section 7b.The inner peripheral surface 7a1 of sealing part 7a is relative with conical surface 2a2 on the excircle that is arranged on shaft portion 2a by predetermined seal space S.In addition, the press fit part 7b1 that wherein is pressed with thrust component 10 is formed on the lower end of lateral section 7b.The inner circumference of this press fit part 7b1 has than the bigger diameter of inner peripheral surface 7c that wherein is fixed with bearing housing 8, and the thickness of the major component of the wall ratio lateral section 7b of this press fit part 7b1 will approach.In addition, be formed on the excircle of bearing support 7 along the fixed surface 7d that axially has predetermined length L.
As shown in the zoomed-in view of Fig. 6, this fixed surface 7d is positioned on the press fit part 7b1, and is connected with this press fit excircle partly by step part 7e.In addition, this fixed surface 7d is straight along its whole axial region L substantially.
Fig. 5 represents this thrust component 10 is press-fited the press fit part 7b1 state before that enters.Fixed surface 7d comprises deformed region 7d2 and other regional 7d1 (not standing the zone of dilatancy in the press-fit process of thrust component 10), deformed region 7d2 radial and outward deformation one prearranging quatity when this thrust component 10 stands press fit.In this embodiment, deformed region 7d2 has the conical in shape that reduces gradually towards the downward direction diameter, and is connected with the excircle of this press fit part 7b1 by step part 7e.In addition, this crushed element 7d2 is with respect to radially inwardly reduction of other regional 7d1, and its reduction equals its amount of outwards being out of shape during the press fit of thrust component 10.The position of this deformed region 7d2 after the dotted line shown in the enlarged view of the right of Fig. 5 is illustrated in distortion, and the maximum amount of recess of this deformed region 7d2 equals maximum deformation quantity δ (value diametrically).Usually, because the magnitude of interference (value diametrically) that the maximum deformation quantity δ of this deformed region 7d2 equals or need near thrust component in press-fit process 10 very much, so the maximum amount of recess of this deformed region 7d2 can be designed to equal the magnitude of interference (value diametrically) that thrust component 10 needs in press-fit process.
For example, form shaft element 2 by the metallic material such as stainless steel, and this shaft element flange portion 2b of comprising shaft portion 2a and being arranged on the lower end of shaft portion 2a integratedly or dividually.The conical surface 2a2 of shaft portion 2a on diameter upwards (towards the outside of bearing support 7) reduce gradually, and under shaft element 2 rotating conditions as centrifugal seal spare.
For example, bearing housing 8 forms cylindrical, and is made by the porous body that sintering metal forms, and is especially made as the sintering metal porous body of essential element by copper.Bearing housing 8 is fixed to the pre-position on the inner circumferential surface of bearing support 7.
Two zones up and down as the radial bearing surface of the first radial bearing part R1 and the second radial bearing part R2 are arranged on the inner circumferential surface 8a of the bearing housing 8 that is formed by sintering metal, and for example produce groove 8a1,8a2 in the lambdoid dynamic pressure shown in Fig. 3 (a) and be formed in these two zones.The top dynamic pressure produce groove 8a1 in the axial direction with respect to axial centre m (up and down between the tipper along axial center) be asymmetrically formed, thereby with respect to axial centre m, the axial dimension X1 of upper area is greater than the axial dimension X2 of lower area.In addition, on the outer peripheral surface 8d of bearing housing 8, form one or more axial groove 8d1 along its whole axial length.In this example, three axial groove 8d1 equally spaced form around this bearing housing.In addition, chamber 8e, 8f are respectively formed at the excircle bight of upper-end surface 8b and lower end surface 8c.
Be formed with dynamic pressure and produce groove 8c1 on the lower end surface 8c as the bearing housing 8 of the thrust bearing surface of the first thrust-bearing part S1, it for example is spiral-shaped shown in Fig. 3 (b).In addition, can user's font or radiation groove shape or analogous shape produce the shape of groove as dynamic pressure.
Shown in Fig. 3 (c), by being arranged on radially the upper-end surface 8b of bearing housing 8 is divided into internal side diameter zone 862 and outside diameter zone 863, and one or more radial groove 8621 is formed on the internal side diameter zone 862 near the circular groove 8b1 with V-arrangement cross section of point midway.In the present embodiment, three radial grooves 8621 form equally spacedly around circumference.
Shown in the enlarged view in the circle of Fig. 2, the internal side diameter zone 7a21 of the internal surface 7a2 of hermetic unit 7a partly contacts with the internal side diameter zone 862 of the upper-end surface 8b of bearing housing 8, and the outside diameter of internal surface 7a2 zone 7a22 forms inclined-plane or curved surface, thereby begins reduction from the upper-end surface 8b of bearing housing 8.As a result, between regional 7a22 of the outside diameter of internal surface 7a2 and upper-end surface 8b (comprising chamber 8e), form the sunk part P of desired volume.Internal side diameter and the circular groove 8b1 of this sunk part P interconnect, and outside diameter and axial groove 8d1 interconnect.
For example, thrust component 10 is made by the metallic material of for example copper, and press fit and being fixed in the inner circumference of press fit part 7b1 of bearing support 7.As shown in Figure 4, on upper-end surface 10a, be formed with for example lambdoid dynamic pressure and produce groove 10a1 as the thrust component 10 of the thrust bearing surface of the second thrust-bearing part S2.In addition, spirality or radiation groove shape or analogous shape can produce the shape of groove as dynamic pressure.
The excircle part 10c of thrust component 10 comprises: press fit surface 10c1, pack into the inner circumference the inside of press fit part 7b1 of bearing support 7 of its press fit; Conical surface 10c2, it extends to upper-end surface 10a from press fit surface 10c1 top edge along intilted direction; And conical surface 10c3, it extends to lower end surface 10b from press fit surface 10c1 lower limb along intilted direction.Press fit surface 10cl is parallel to axially.
Hydrodynamic bearing apparatus 1 by following step assembling present embodiment.
At first, bearing housing 8 is filled in the inner circumferential surface 7c of bearing support 7, up to the internal surface 7a2 of its upper-end surface 8b contact seal part 7a.Thereby this bearing housing 8 is with respect to bearing support 7 location.Bearing housing 8 can be fixed to the inner circumferential surface 7c of bearing support 7 by press fit, gluing, press fit and gluing combination or other suitable fixation methods.
Then shaft element 2 is inserted in the bearing housing 8.By the internal diameter size after measurement axis bearing sleeve 8 is in fixed bearing block 7, the outside dimension (measuring in advance) with shaft portion 2a carries out the size coupling then, thereby can determine the radial bearing gap accurately.
Secondly, make thrust component 10 press fits enter the inner circumference of the press fit part 7b1 of bearing support 7, up to being fixed on the precalculated position.Because the deformed region 7d2 of the fixed surface 7d of bearing support 7 is with respect to radially inwardly reduction of other regional 7d1, its reduction equals the outside amount of deformation (see figure 5) of its generation during the press fit of thrust component 10, so when press-fiting thrust component 10, the fixed surface 7d of bearing support 7 is straight substantially shape (see figure 6) in the axial direction along whole axial region L.Therefore when the fixed surface 7d of bearing support 7 was fixed on the inner circumference of support 6, this stationary state was stable, and can obtain the constant intensity of needs.
Finish when assembling, the shaft portion 2a of shaft element 2 inserts in the inner circumferential surface 8a of bearing housing 8, and flange portion 2b is contained in the space between the upper-end surface 10a of the lower end surface 8c of bearing housing 8 and thrust component 10.Subsequently, the inner space of bearing support 7 is by hermetic unit 7a sealing and comprise a plurality of ducts of bearing housing 8, and the lubricated oil in this inner space is full of.The pasta of lubricant oil remains in the seal space S.
During shaft element 2 rotation, relative by the radial bearing gap with the external peripheral surface 2a1 of shaft portion 2a as each zone in the zone (upper and lower zone) on the radial bearing surface of the inner circumferential surface 8a of bearing housing 8.In addition, zone as the thrust bearing surface of the lower end surface 8c of bearing housing 8 is relative with the upper-end surface 2b1 of flange portion 2b by the thrust-bearing gap, and it is relative with the lower end surface 262 of flange portion 2b to pass through the thrust-bearing gap as the zone of the thrust bearing surface of the upper-end surface 10a of thrust component 10.When shaft element 2 rotations, in the radial bearing gap, produce the dynamic pressure of lubricant oil, thereby come the rotatably shaft portion 2a of back shaft element 2 in non-contacting mode diametrically by the lubricating oil oil film that is formed in the radial bearing gap.Therefore, form the first radial bearing part R1 and the second radial bearing part R2, they are diametrically with non-contacting mode back shaft element 2 rotatably.Simultaneously, in the thrust-bearing gap, produce the dynamic pressure of lubricant oil, thus by the lubricating oil oil film that in above-mentioned thrust-bearing gap, forms along thrust direction with the non-contacting mode flange portion 2b of back shaft element 2 rotatably.Therefore, form the first thrust-bearing part S1 and the second thrust-bearing part S2, they along thrust direction with non-contacting mode back shaft element 2 rotatably.
As mentioned above, the dynamic pressure of the first radial bearing part R1 produce groove 8a1 with respect to axial centre m along axially asymmetricly forming, thereby with respect to axial centre m, the axial dimension X1 of upper area is greater than the axial dimension X2 (seeing Fig. 3 (a)) of lower area.As a result, during the rotation of shaft element 2, the retracting force (suction force) of the lubricant oil that is produced by dynamic pressure generation groove 8a1 in upper area is greater than lower area.Result as this retracting force pressure reduction, the lubricating oil of filling in the gap between the external peripheral surface 2a1 of the inner circumferential surface 8a of bearing housing 8 and shaft portion 2a flows downward, and follow thrust-bearing gap, axial notch 8d1, sunk part P, circular groove 8b1, the radial groove 8621 of circulation route through the first thrust-bearing part S1, turn back to the gap between the external peripheral surface 2a1 of the inner circumferential surface 8a of bearing housing 8 and shaft portion 2a then, thereby flow to again in the radial bearing gap of the first radial bearing part R1.By adopt lubricant oil in the inside, inner space of bearing support 7 circuit structure in this manner, can prevent this phenomenon, that is: the lubricating oil pressure in this inner space is a negative pressure at regional area, thereby relevant problem is solved, for example: follow the generation of negative pressure and produce bubble, and owing to the leakage or the vibration that produce the lubricant oil that bubble takes place.In addition, even owing to a certain reason bubble is collected in the lubricant oil, bubble also can be along with lubrication oil circulation so, and discharges by the pasta (gas-liquid interface) of the lubricant oil in the seal space S, thereby can more effectively prevent the problem relevant with bubble.
Also can press-fit at the following thrust component 10 of effect of the Bond between the inner circumference of the press fit part 7b1 that is arranged on thrust component 10 and bearing support 7 and be fixed on this inner circumference.Particularly, shown in the zoomed-in view of Fig. 7, Bond T is coated to the lower end of the inner circumferential portion 7c1 of press fit part 7b1, thrust component 10 is press-fited enter inner circumferential portion 7c1 then up to the precalculated position.In press-fiting in the process of thrust component 10, Bond T also plays the effect of oiling agent, and this just means: not only reduced the generation that press-fits in the process abrasion particulate, and press-fited operation and also become easier.The step part 7c11 that faces the outside of bearing support 7 is formed on the inner circumferential portion 7c1, and in this embodiment, step part 7c11 is the inclined-plane that downward diameter increases gradually.
Fig. 8 represents to finish the press fit state afterwards of thrust component 10.The press fit surface 10cl of the excircle part 10c of this thrust component 10 press-fits in the inner circumferential portion 7c1 of the press fit part 7b1 that enters bearing support 7 with predetermined press fit tolerance.Press fit part adjacency in interior tapered space Q1 and the bearing support 7, and the press fit part adjacency in the outside cone space Q2 and bearing support 7 outsides.Interior tapered space Q1 is formed between the conical surface 10c2 and inner circumferential portion 7c1 of excircle part 10c upside, and has the shape that narrows down gradually towards the press fit part.Outside cone space Q2 is formed between the conical surface 10c3 and inner circumferential portion 7c1 of excircle part 10c downside, and has the shape that narrows down gradually towards the press fit part.
When thrust component 10 stood press fit, the capillarity by interior tapered space Q1 kept along being pressed into the Bond T that direction is coated on thrust component 10 fronts everywhere.The abrasion particulate M that produces during being captured in thrust component 10 and being press-fited by the Bond T in the Q1 of this interior tapered space is sealed in these abrasion particulates inside the Bond T when Bond T hardening then.The result of the bonding confining force that produces as interior tapered space Q1 can stop Bond T to flow to shaft element 2, and can further increase Bond T catching and seal action abrasion particulate M.
In addition, also can maintain Bond T by the capillarity of outside cone space Q2, and the press fit part of Bond T sealing thrust component 10 that should keep.As this embodiment, if step part 7c11 is arranged on the inner circumferential portion 7c1 the inside of the press fit part 7b1 of bearing support 7, because it is bigger to be retained in the amount of the Bond T in the outside cone space Q2 after thrust component 10 is pressed into, so can further be increased in seal action on the press fit part.
Fig. 9 represents the Hydrodynamic bearing apparatus 11 according to another embodiment.In this embodiment, the Bond storage U-shaped of spill becomes in the inner circumferential surface 7c of bearing support 7.For example, this Bond storage U-shaped becomes the circular groove shape of the inner circumferential surface 7c of threaded shaft bearing 7, along axially being formed with conical surface U1 respectively in its two side areas.Correspondingly, this Bond storage U these two axially on size reduce gradually.
For bearing housing 8 is fixed in the bearing support 7, at first with the adhesive coated of prearranging quatity to the inner circumferential surface 7c of bearing support 7.Then, bearing housing 8 is inserted in the inner circumferential surface 7c of bearing support 7, up to the inner surface 7a2 of upper-end surface 8b contact seal part 7a.Thereby with respect to bearing support 7 positioning shaft bearing sleeves 8.When the Bond hardening and when keeping this state simultaneously, can be fixed on bearing housing 8 on the position that needs with respect to bearing support 7.
In this embodiment, because Bond U is arranged on the inner circumferential surface 7c of bearing support 7, even so owing to superfluous Bond T (seeing the interior enlarged view of circle of Fig. 9) appears in excessive coating, Bond T that so should surplus also can be collected in the Bond storage U of spill, can prevent that therefore the Bond T that is coated with from producing adverse influence to the location of bearing housing 8 or the performance of bearing everywhere.In addition, size on two axial directions reduces gradually because conical surface U1 makes Bond storage U, so the location of bearing housing 8 finish and Bond T sclerosis between during this period of time in, the superfluous Bond T that is collected in the Bond storage U will flow towards two narrower axial directions under capillarity, fill target fixed area (space between the inner circumferential surface 7c of the external peripheral surface 8d of bearing housing 8 and bearing support 7).As a result, the problem that can avoid there is too much Bond in the fixed area of bearing housing 8 or lack Bond can obtain stable stationary state.
In addition, need the sunk part of capacity P to be arranged between the upper-end surface 8b of the outside diameter zone 7a22 of inner surface 7a2 of hermetic unit 7a and bearing housing 8 (comprising chamber 8e) because have, even so Bond is coated with everywhere, Bond T is also minimum may to flow to radial groove 8621.Particularly under this embodiment's situation, because cone space (being formed between inner surface 7a2 and the chamber 8e) is arranged on the external diameter side of sunk part P, so the capillarity by this cone space will be attracted towards above-mentioned fixed area (gap between the inner circumferential surface 7c of the external peripheral surface 8d of bearing housing 8 and bearing support 7) at the Bond T in the sunk part P, thereby can prevent more effectively that Bond T from flowing towards radial groove 8621.Correspondingly, can avoid taking place the situation that Bond T blocks these radial grooves 8621 effectively.
The other technologies content is identical with the first above-mentioned embodiment, therefore omits their description at this.
Claims (8)
1. Hydrodynamic bearing apparatus, this Hydrodynamic bearing apparatus comprises: bearing support; Be fixed to the bearing housing on the inner circumference of bearing support; Shaft element with shaft portion and flange portion; Be fixed to the thrust component of bearing support one end inner circumferential portion; The radial bearing part, its be arranged between bearing housing and the shaft portion and the dynamic pressure effect by the lubricant oil that in the radial bearing gap, produces along radially supporting this shaft portion in non-contacting mode; And the thrust-bearing part, it is arranged between bearing housing and thrust component and the flange portion and supports this flange portion along thrust direction in non-contacting mode by the dynamic pressure effect of the lubricant oil that produces in the thrust-bearing gap, wherein,
This thrust component is pressed into and is fixed on this inner circumferential portion by the Bond between the inner circumferential portion that is arranged in itself and bearing support one end.
2. Hydrodynamic bearing apparatus according to claim 1, it is characterized in that, excircle at this thrust component partly and between the inner circumferential portion of this bearing support one end is provided with the interior tapered space, so that maintain Bond, and this interior tapered spatial neighbor is positioned at the press fit part of the thrust component of this bearing support.
3. Hydrodynamic bearing apparatus according to claim 2 is characterized in that, the outer circumference portion branch of this thrust component comprises the conical surface that is used for forming described interior tapered space.
4. Hydrodynamic bearing apparatus according to claim 2, it is characterized in that, excircle at thrust component partly and between the inner circumferential portion of this bearing support one end also is provided with outside cone space, so that maintain Bond, this outside cone space vicinity is positioned at the press fit part of the thrust component in the bearing support outside.
5. Hydrodynamic bearing apparatus according to claim 4 is characterized in that, the outer circumference portion branch of this thrust component comprises the conical surface that is used for forming outside cone space.
6. Hydrodynamic bearing apparatus according to claim 4 is characterized in that, the inner circumferential portion that is positioned at this bearing support one end comprises step part, and this step part is positioned at outside cone space, and towards the outside of bearing support.
7. method of making hydraulic bearing, this hydraulic bearing comprises: bearing support; Be fixed to the bearing housing on the inner circumference of bearing support; Shaft element with shaft portion and flange portion; Be fixed to the thrust component of the inner circumferential portion of bearing support one end; The radial bearing part, its be arranged between bearing housing and the shaft portion and the dynamic pressure effect by the lubricant oil that in the radial bearing gap, produces along radially supporting this shaft portion in non-contacting mode; And thrust-bearing part, it is arranged between bearing housing and thrust component and the flange portion and supports this flange portion along thrust direction in non-contacting mode by the dynamic pressure effect of the lubricant oil that produces in the thrust-bearing gap, and this method comprises the following steps:
Adhesive coated on the inner circumferential portion of bearing support one end, and is pressed into this thrust component the inner circumferential portion the inside that is positioned at bearing support one end that has applied Bond.
8. motor, this motor comprises: rotor; Be used for the Hydrodynamic bearing apparatus of support rotor rotation; Be used for keeping the holding member of this Hydrodynamic bearing apparatus; And stator and rotor magnet, they are arranged between this rotor and this holding member, and by be arranged between them predetermined gap toward each other, wherein,
This Hydrodynamic bearing apparatus comprises: by the bearing support of this holding member maintenance; Be fixed to the bearing housing on the inner circumference of this bearing support; Have the shaft element of shaft portion and flange portion, it rotates with rotor; Be fixed to the thrust component of the inner circumferential portion of this bearing support one end; The radial bearing part, its be arranged between this bearing housing and this shaft portion and the dynamic pressure effect by the lubricant oil that in the radial bearing gap, produces along radially supporting this shaft portion in non-contacting mode; And the thrust-bearing part, it is arranged between this bearing housing and this thrust component and this flange portion and supports this flange portion along thrust direction in non-contacting mode by the dynamic pressure effect of the lubricant oil that produces in the thrust-bearing gap, wherein,
This thrust component be pressed into and be fixed on this inner circumferential portion by the Bond between the inner circumferential portion that is arranged in itself and bearing support one end and
In the excircle of this thrust component part with between the inner circumferential portion of this bearing support one end, be provided with the interior tapered space, so that maintain Bond, the press fit part of the thrust component in this this bearing support of interior tapered spatial neighbor.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002342145A JP2004176778A (en) | 2002-11-26 | 2002-11-26 | Dynamic pressure bearing device, method of manufacturing the same, and motor using the same |
| JP2002342145 | 2002-11-26 | ||
| JP2002343829 | 2002-11-27 | ||
| JP2002343835 | 2002-11-27 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101154704A Division CN100348876C (en) | 2002-11-26 | 2003-11-26 | Dynamic pressure bearing, mfg method and motor using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101144498A true CN101144498A (en) | 2008-03-19 |
| CN100582508C CN100582508C (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710153530XA Expired - Lifetime CN101144499B (en) | 2002-11-26 | 2003-11-26 | Dynamic pressure bearing device and motor using the same |
| CN200710153529A Expired - Lifetime CN100582508C (en) | 2002-11-26 | 2003-11-26 | Dynamic pressure bearing device, method of manufacturing the same, and motor using the same |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710153530XA Expired - Lifetime CN101144499B (en) | 2002-11-26 | 2003-11-26 | Dynamic pressure bearing device and motor using the same |
Country Status (2)
| Country | Link |
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| JP (1) | JP2004176778A (en) |
| CN (2) | CN101144499B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102144105B (en) * | 2008-09-09 | 2014-04-02 | Ntn株式会社 | Fluid bearing device and method of manufacturing same |
| CN114233753A (en) * | 2021-12-22 | 2022-03-25 | 武昌船舶重工集团有限公司 | Method for manufacturing plastic sliding bearing |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101418905B1 (en) * | 2011-09-30 | 2014-07-14 | 니혼 덴산 가부시키가이샤 | Motor and disk drive apparatus |
| WO2023162059A1 (en) * | 2022-02-24 | 2023-08-31 | 株式会社アイシン | Manufacturing method of rotor for electric rotary machine |
-
2002
- 2002-11-26 JP JP2002342145A patent/JP2004176778A/en active Pending
-
2003
- 2003-11-26 CN CN200710153530XA patent/CN101144499B/en not_active Expired - Lifetime
- 2003-11-26 CN CN200710153529A patent/CN100582508C/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102144105B (en) * | 2008-09-09 | 2014-04-02 | Ntn株式会社 | Fluid bearing device and method of manufacturing same |
| CN114233753A (en) * | 2021-12-22 | 2022-03-25 | 武昌船舶重工集团有限公司 | Method for manufacturing plastic sliding bearing |
| CN114233753B (en) * | 2021-12-22 | 2024-01-16 | 武昌船舶重工集团有限公司 | Manufacturing method of plastic sliding bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004176778A (en) | 2004-06-24 |
| CN101144499B (en) | 2010-06-09 |
| CN100582508C (en) | 2010-01-20 |
| CN101144499A (en) | 2008-03-19 |
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