CN101400908B - Fluid bearing device - Google Patents
Fluid bearing device Download PDFInfo
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- CN101400908B CN101400908B CN2007800082777A CN200780008277A CN101400908B CN 101400908 B CN101400908 B CN 101400908B CN 2007800082777 A CN2007800082777 A CN 2007800082777A CN 200780008277 A CN200780008277 A CN 200780008277A CN 101400908 B CN101400908 B CN 101400908B
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Abstract
Disclosed is a fluid bearing device having high bearing performance. Specifically, a bearing member (6) comprises an inner diameter section (8) having a radial bearing surface and an outer diameter section (7) having a surface to be fitted with a bracket (5). Both the inner diameter section (8) and the outer diameter section (7) are made of a resin. The inner diameter section (8) is made of preferably an oleoresin, more preferably a porous resin. Meanwhile, the outer diameter section (7) is made of a nonporous resin.
Description
Technical field
The present invention relates to a kind of hydrodynamic bearing device.
Background technique
Hydrodynamic bearing device is the relative rotation that utilizes bearing components and shaft component, rotates the bearing means of supporting axle member freely by the oil film that is formed at the bearing play.This hydrodynamic bearing device has the characteristics of high speed rotating, high running accuracy, low noise etc., in recent years, this characteristics of applying in a flexible way, as information equipment, the spindle drive motor that for example is loaded into magneto-optical disc apparatus such as optical disk unit such as disk device, CD-ROM, CD-R/RW, DVD-ROM/RAM, MD, MO such as HDD, FDD etc. is used; The multiaspect scanner motor that is loaded into laser printer (LBP) etc. is used; Be loaded into the fan motor usefulness of personal computer (PC) etc., or be loaded into the bearing that the miniature motor of the electrical equipment of axial fan etc. is used, be widely used.
This FDB roughly is divided into the hydraulic bearing of the dynamic pressure generating unit that possesses fluid (for example, lubricant oil) the generation dynamic pressure that makes in the bearing play and does not possess the so-called positive circular journal bearing (bearing surface is the bearing of positive toroidal) of dynamic pressure generating unit.
For example, in the hydrodynamic bearing device of the spindle drive motor of the HDD that packs into etc., the radial bearing portion of supporting axle member radially is set and along the thrust bearing division of thrust direction supporting axle member.As the bearing of radial bearing portion, use hydraulic bearing mostly, this hydraulic bearing is at the groove that is provided with dynamic pressure generation usefulness by the radial bearing gap on opposed two sides (outer circumferential face of shaft component or the inner peripheral surface of bearing components).On the other hand,, use hydraulic bearing sometimes, use the bearing (so-called trunnion bearing) of the structure of an end that contacts the supporting axle member sometimes as thrust bearing division.
The bearing components of this hydrodynamic bearing device of packing into possesses: inside diameter (axle sleeve), and it has radial bearing surface; Outer diameter part (housing), it has attachment face with other members at outer circumferential face.In recent years, be purpose to realize cost degradation, for example the spy opens 2005-No. 114164 communiques (patent documentation 1), motion outer diameter part is made resinous bearing means.
Patent documentation 1:(Japan) spy opens communique 2005-No. 114164
Follow the low price rapidly of information equipment in recent years, wish the further cost degradation of hydrodynamic bearing device.In the bearing means of putting down in writing in the patent documentation 1, inside diameter and outer diameter part are made the branch body structure, for insufficient lubrication or the abrasion that prevent to cause because of sliding friction with shaft component, and the bearing performance that long term maintenance is high, the inside diameter porous plastid of the sintering metal by can keeping lubricant oil in inside mostly form.But, in order to form the inside diameter of sintering metal system accurately, need a lot of operations, usually, cause its manufacture cost to raise easily.Especially be provided with under the situation of dynamic pressure generating unit of dynamic pressure groove etc. at inside diameter, more need a lot of operations.
Summary of the invention
Problem of the present invention is, a kind of hydrodynamic bearing device is provided at low cost, and this hydrodynamic bearing device possesses high bearing performance.
In order to solve above-mentioned problem, the invention provides a kind of hydrodynamic bearing device, possess: bearing components, it possesses the inside diameter with radial bearing surface and has outer diameter part with the attachment face of other members; Radial bearing portion, the axle that it radially supports the oil film supporting that the radial bearing gap that is used for being faced by radial bearing surface forms is characterized in that the inside diameter and the outer diameter part of bearing components are resin system.Need to prove,, can enumerate and be the carriage of motor substrate or staor winding etc. as above-mentioned " other members ".
As mentioned above, among the present invention, the inside diameter of bearing components and the both sides of outer diameter part are resin system, therefore compare with the present formation of inside diameter being made sintering metal system, by the simplification of manufacturing process and the minimizing of cost of material, can realize cheapization of manufacture cost.
But,, consider bonding method of carrying out as the method that is used for inside diameter and outer diameter part are interfixed.But, for bonding, can not obtain sufficient retention force, when applying excessive impulsive load, might break away from from outer diameter part by inside diameter, that is, might not bring into play effect as bearing.As the formation that prevents to break away from, can consider inside diameter and outer diameter part integrally formed, but so, can not expect oil from inside diameter to the bearing play supply, so the low on fuel of bearing play might cause insufficient lubrication.Moreover, concerning inside diameter and outer diameter part, desired separately function difference, if therefore by common material it is shaped together, in any case then also be difficult to satisfy the needed function of both sides, the raising of bearing performance is restricted.
About this point, as mentioned above, the interior outer diameter part of bearing components is made different parts, under situation, can both be fixed strongly by the method for deposition etc. by any ester moulding.Thus, between inside diameter and outer diameter part, guarantee high withdrawal force, thereby can improve the shock-resistant load of hydrodynamic bearing device.
The inside diameter of bearing components can form by different resins with outer diameter part.If be to constitute like this, then relevant inside diameter and outer diameter part can select to use the resin combination that is suitable for both desired characteristics separately, can realize the raising of the bearing performance of bearing means integral body thus.Need to prove that above-mentioned what is called " different resins " not only refers to " base resin difference ", and comprise the meaning of " the composition difference that contains the resin combination integral body of filler etc. ".That is,, the kind of filler or the different resin combination of mixing ratio also are contained within " different resins " though it is identical to constitute the base resin of inside diameter and outer diameter part.In addition, even the kind of base resin filler or mixing ratio are identical, the different situation of its density (non-porous matter resin and porous matter resin etc.) also is contained within " different resins ".
For example, if pass through oleoresin, especially the oleoresin of porous matter forms the inside diameter with radial bearing surface, then the oil of the emptying aperture of inside diameter maintenance oozes out to the surface, abundant oil can be supplied to radial bearing gap or thrust-bearing gap thus, thereby can access high greasy property.The oleoresin of porous matter for example, has mixed the resin material that pore forms material by first injection moulding, thereafter, removes pore and forms material, forms by impregnation in oil again.
In addition, as long as the solid-state resin combination (non-porous matter resin) by there not being emptying aperture forms outer diameter part, just can avoid oil from emptying aperture ooze out and cause to the oil leakage of bearing outside or with the bonding strength of other members under the harmful effect of degradation.
In addition, be under the resinous situation at the inside diameter and the outer diameter part of bearing components, this bearing components can be in the either party's that embeds inside diameter or outer diameter part mode injection moulding.Be shaped if embed, as long as improve mould and die accuracy, then not only can improve the assembly precision of inside diameter and outer diameter part, and can in same operation, carry out the shaping of inside diameter or outer diameter part and both assemblings, thereby can realize cheapization of manufacture cost.
But, at a part of injection moulding that embeds (embed and be shaped) parts under the situation of the parts that cavity exposes, the precise decreasing that heat during for fear of the embedding shaping causes, built in items uses the material higher than the melting point of injection material usually, if like this, then highi degree of accuracy forms built in items, but also must prepare high-precision injection moulding mould, therefore might be able to not enjoy to the full and embed the low-cost advantage that is shaped and brings.
Relevant this problem can be by forming inside diameter and outer diameter part by different resins, and the side that the melting point in inside diameter and the outer diameter part is low uses and solves as built in items.That is, if be such formation, heat or plus-pressure in the time of then can being shaped by embedding deform the component surface of a side that becomes built in items, and can imitate into the surface (for example, the surface of inner mold) of embedding forming die.Therefore, embed forming die as long as form accurately, then can establish its parts precision at the shaping stage of built in items is lower precision, therefore can realize cheapizationer of manufacture cost.
In above-mentioned formation, can make the radial bearing gap that the dynamic pressure generating unit of hydrodynamic takes place in the radial bearing surface setting of inside diameter, thus, can constitute radial bearing portion by the good hydraulic bearing of running accuracy.Especially, bearing components is made as the either party with inside diameter or outer diameter part under the situation of injection-molded article of built in items, for example by the resin combination shaping inside diameter lower than the melting point of outer diameter part, if with inside diameter as built in items, then in inner mold, be formed with in advance and the corresponding forming die of the shape of dynamic pressure generating unit, thus, also can utilize above-mentioned characteristics, when embedding shaping, the dynamic pressure generating unit is set on the radial bearing surface of inside diameter.This situation is compared with the situation of the dynamic pressure generating unit that sets in advance this kind concerning sintering metal, can reduce process number.
In addition, at this moment, the heat of giving when the surface of built in items is shaped because of embedding dissolves, and becomes the state that dissolves joint, or the junction plane that becomes with the shaping side member is concavo-convex state, becomes and utilizes so-called anchoring to decide the state that effect is strengthened the adhesive strength of inside diameter and outer diameter part.
Under the situation of the injection-molded article of bearing components being made built in items as the either party with inside diameter or outer diameter part, wish that also inside diameter is formed by the oleoresin that lubricant oil can be supplied to the bearing play, wish that especially more the porous plastid (porous matter resin) of the resin of the lubricant oil of amount forms the porous plastid identical with sintering metal by keeping fully.As mentioned above, be because the porous plastid of resin can utilize earlier and contain the resin that pore forms material and carry out injection moulding, remove pore thereafter and form material and form, compare the simple cause of its manufacturing process with sintering metal.
The hydrodynamic bearing device of above-mentioned formation is preferred for having the motor of rotor magnet and staor winding, for example spindle drive motor of using of HDD etc.
As known from the above, can low-cost provide a kind of hydrodynamic bearing device that possesses high bearing according to the present invention.
Description of drawings
Fig. 1 has packed the information equipment of hydrodynamic bearing device of the present invention into the sectional drawing of spindle drive motor;
Fig. 2 is the sectional drawing of first configuration example of first mode of execution of expression hydrodynamic bearing device of the present invention;
Fig. 3 (A) is the sectional drawing of expression inside diameter shown in Figure 2, and figure, (C) that (B) is the upside end face of expression inside diameter shown in Figure 2 is the figure of the downside end face of expression inside diameter shown in Figure 2;
Fig. 4 is the sectional drawing of second configuration example of first mode of execution of expression hydrodynamic bearing device;
Fig. 5 is the sectional drawing of the 3rd configuration example of first mode of execution of expression hydrodynamic bearing device;
Fig. 6 is the sectional drawing of the 4th configuration example of first mode of execution of expression hydrodynamic bearing device;
Fig. 7 is the sectional drawing of the 5th configuration example of first mode of execution of expression hydrodynamic bearing device;
Fig. 8 is the sectional drawing of first configuration example of second mode of execution of expression hydrodynamic bearing device;
Fig. 9 (A) is the sectional drawing of expression inside diameter shown in Figure 8, and figure, (C) that (B) is the upside end face of expression inside diameter shown in Figure 8 is the figure of the downside end face of expression inside diameter shown in Figure 8;
Figure 10 is the sectional drawing of second configuration example of second mode of execution of expression hydrodynamic bearing device;
Figure 11 is the sectional drawing of the 3rd configuration example of second mode of execution of expression hydrodynamic bearing device;
Figure 12 is the sectional drawing of the 4th configuration example of second mode of execution of expression hydrodynamic bearing device;
Figure 13 is the sectional drawing of the 5th configuration example of second mode of execution of expression hydrodynamic bearing device;
Symbol description:
1,21 hydrodynamic bearing devices
2,22 shaft components
The 4a staor winding
The 4b rotor magnet
5 carriages
6,26 bearing components
7,27 outer diameter parts
8,28 inside diameters
9,29 first lip parts
10,30 second lip parts
R1, R2 radial bearing portion
T1, T2 thrust bearing division
S1, S2 seal space
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
Fig. 1 conceptually represents to be assembled with the configuration example of the information equipment of hydrodynamic bearing device with spindle drive motor.The spindle drive motor of this spindle drive motor for using at disk drives such as HDD, it possesses that the hydrodynamic bearing device 1 of the shaft component 2 that disk hub 3 is installed is supported in rotation freely and for example via the opposed staor winding 4a in the gap of radial direction and rotor magnet 4b and carriage 5.Staor winding 4a is installed in the periphery of carriage 5, and rotor magnet 4b is installed in the periphery of disk hub 3.The bearing components 6 of hydrodynamic bearing device 1 is fixed in the interior week of carriage 5.Keeping the plate-like information recording carrier of one or more disks etc. (below, abbreviate dish as) D on the disk hub 3.Like this in the spindle drive motor of Gou Chenging, when making staor winding 4a energising, by the electromagnetic force that takes place between staor winding 4a and rotor magnet 4b rotor magnet 4b is rotated, thereupon, disk hub 3 and the dish D and shaft component 2 one that remain on the disk hub 3 are rotated.
Fig. 2 is the figure that is illustrated in an example of the hydrodynamic bearing device that uses on the above-mentioned spindle drive motor, is the figure of an example (first configuration example) of first mode of execution of expression hydrodynamic bearing device of the present invention.Possesses the bearing components 6 of the shaft component 2 of rotary side and fixed side as main component parts with the hydrodynamic bearing device shown in the figure 1.Below, for the convenience on illustrating, the end of establishing shaft component 2 is a upside from the outstanding side of the opening portion of bearing components 6, establishing this axial opposition side is that downside describes.
In this configuration example, between the outer circumferential face 2a of the inner peripheral surface 8a of the inside diameter 8 that constitutes bearing components 6 and shaft component 2, axially leave the first radial bearing R1 and the second radial bearing R2 are set.In addition, between the downside end 9b of the upside end face 8b of inside diameter 8 and first lip part 9, the first thrust bearing division T1 is set, between the upside end face 10b of the downside end face 8c of inside diameter 8 and second lip part 10, the second thrust bearing division T2 is set.
Axially be spaced apart as two zones up and down of the radial bearing surface of first R1 of radial bearing portion and second R2 of radial bearing portion at the inner peripheral surface 8a of inside diameter 8, in these two zones, as the dynamic pressure generating unit, for example form dynamic pressure groove 8a1, the 8a2 of the herringbone shape shown in Fig. 3 (A) respectively.In illustrated example, the two relative axle direction center of dynamic pressure groove 8a1,8a2 forms symmetric shape, but for example with respect to the dynamic pressure groove 8a1 central axis direction center of upside, the axle direction width of upper-side area groove is grown up than the axle direction width of the groove of underside area, when shaft component 2 rotations, also can give the power that is pressed into (pumping force) of below axially thus to lubricant oil.Dynamic pressure groove 8a1,8a2 also can form at the outer circumferential face 2a of the opposed shaft component 2 in gap that passes through the radial bearing crack.The dynamic pressure groove also can form known other shape, and is for example spiral-shaped etc.
The local of the upside end face 8b of inside diameter 8 or all annular sections form the thrust bearing surface of the first thrust bearing division T1, be that the zone formation of this thrust bearing surface is as the spiral-shaped dynamic pressure groove 8b1 shown in for example Fig. 3 (B) of power generating unit.Equally, the local of the downside end face 8c of inside diameter 8 or all annular sections form the thrust bearing surface of the second thrust bearing division T2, be that the zone formation of this thrust bearing surface is as the spiral-shaped dynamic pressure groove 8c1 shown in for example Fig. 3 (C) of power generating unit.The power generating unit also can passed through opposed of thrust-bearing gap, and promptly the upside end face 10b of the downside end face 9b of first lip part 9 and second lip part 10 forms.In addition, the dynamic pressure groove shape except that above-mentioned spiral-shaped, for example also can form herringbone shape etc.
In addition, above-mentioned dynamic pressure groove 8a1,8a2,8b1,8c1 can carry out die forming when inside diameter 8 is shaped.For example as long as the zone corresponding with the dynamic pressure groove forms these mold in the forming die that inside diameter 8 is shaped, just can be easily and form these dynamic pressure grooves at low cost.
As the base resin that is used to form inside diameter 8, as long as can carry out injection moulding, and satisfy desired heat resistance, oil resistance, mechanical strength etc., no matter thermoplastic resin, thermosetting resin all can use, for example, can use the plastics of one or more mixing that are selected from following illustrative general-purpose plastics, general engineering plastic and superpower engineering plastics.It is desirable to the plastics that at least a above-mentioned superpower engineering plastics that require characteristic good are mixed.The various fillers that also can in base resin, cooperate a kind of or several reinforcing materials or oiling agent, conductive material etc.
As spendable general-purpose plastics, for example can enumerate polyethylene (PE), polypropylene (PP), polystyrene (PS), epoxy (EP).In addition,, for example can enumerate as general engineering plastic, polyoxymethylene (POM), polyethylene terephthalate (PET), polybutylene terephthalate (ester) (PBT), poly-acetic acid esters (PC) etc.
In addition, as operable super engineering plastics, for example can enumerate: polyphenylene sulfide (PPS), polyether-ketone (PEK), polyether-ether-ketone (PEEK), Polyetherimide (PEI), polyether sulfone (PES), polyamidoimide (PAI), thermoplastic polyimide (TPI), Thermocurable polyimide, polyamide (PA), aromatic polyamides such as polyamide 6 T, polyamide 9T; Tetrafluoroethylene hexafluoropropylene copolymer (PFA), ethylene tetrafluoroethylene copolymer fluorine such as (ETFE) acrylic copolymer resin etc.
In above-mentioned base resin, make pore form material, packing material mixing, be formed for the resin composition (injection material) of the shaping of inside diameter 8 thus with normally used mixing method in the mixing of doing resins such as mixing, melting mixing.Form material as pore, the fusing in order to prevent to be shaped can be used the fusing point with the forming temperature that is higher than selected base resin, and behind the shaping inside diameter 8, the removable moulding material of solvent of base resin is not dissolved in use cooperating with base resin.Wherein, particularly can preferably use for after can forming easily remove operation water-soluble, can be used as the alkalescent material that rust preventing agent uses in addition.
As the pore moulding material, can use Sodium Benzoate, sodium acetate, decanedioic acid sodium, sodium succinate or sodium stearate etc. to be inorganic alkaline metal salt of representative etc. as the organic alkali metal salt of representative and sodium carbonate, sodium molybdate, potassium molybdate, sodium tungstate, sodium tripolyphosphate, trisodium phosphate etc.Wherein, especially preferably improve the degrees of freedom of base resin and Sodium Benzoate, sodium acetate, the decanedioic acid sodium of water-soluble excellence with high-melting-point.These slaines only use a kind of, and in addition, it is two or more also can to mix use.Need to prove that the Mean particle diameter of the pore moulding material of use is preferably 0.1～500 μ m.This be because, the particle diameter of pore moulding material, promptly be that 0.1 μ m is when following at inside diameter 8 formed emptying aperture diameters, utilize lubricated oil surface tension not carry out smoothly to the bearing play supplying lubricating oil, the emptying aperture diameter is that 500 μ m are when above, surface area diminishes, and can not obtain desirable bearing rigidity.
In addition, the mixing ratio that preferred pore forms material is 30vol%～90vol% with respect to the total amount that comprises base resin, pore formation material and filler etc., more preferably 40vol%～60vol%.This be because, if be below the 30vol%, just can not guarantee the abundant emptying aperture of measuring, when 90vol% is above, can not obtain desired mechanical strength.
Constitute outer diameter part 7 base resin can with inside diameter 8 the same injection mouldings, as long as and can satisfy desired heat resistance, oil resistance, mechanical strength etc., no matter thermoplastic resin, thermosetting resin all can use, can use the plastics of one or more mixing that are selected from above-mentioned general-purpose plastics, general engineering plastic and superpower engineering plastics.The various fillers that can in base resin, cooperate one or more reinforcing materials (no matter fibrous, Powdered etc. form) or oiling agent, conductive material etc.
At fixing above-mentioned inside diameter 8 of the interior week of this outer diameter part 7.Both fixing can be undertaken by suitable methods such as deposited, bonding, extruding, extruding are bonding, but in this configuration example, by interface (part zone of the outer circumferential face 8d of inside diameter 8 and the inner peripheral surface 7a of outer diameter part 7) is dissolved, thereby obtain high adhesive strength between the two, and by short deposited the fixing (melt-coating part is represented with the dotted line among the figure) of fixing needed time.As concrete deposited method, known deposited method such as can use that ultrasonic wave coating, laser cladding, vibration are deposited, high frequency induction heating sintering or hot plate are deposited can suit to select according to the composition of outer diameter part 7 and inside diameter 8 or shape etc.
Between the inner peripheral surface 7a of the upper end open portion of the outer circumferential face 9a of first lip part 9 and outer diameter part 7, form the first seal space S1 of specified volume.In addition, between the inner peripheral surface 7a of the lower ending opening portion of the outer circumferential face 10a of second lip part 10 and outer diameter part 7, form the second seal space S2 of specified volume.In the present embodiment, the outer circumferential face 10a of the outer circumferential face 9a of first lip part 9 and second lip part 10 forms respectively towards the outer side of the bearing conical surface shape of undergauge gradually.So two seal space S1, S2 are (internal direction of bearing components 6) conical surface shape of undergauge gradually on approximating direction.During shaft component 2 rotation, the sucking action of the lubricant oil in two seal space S1, the S2 by capillary force and the sucking action of the centrifugal force during rotation are drawn towards the direction (internal direction of bearing components 6) that seal space narrows down.Thus, can prevent effectively that lubricant oil from spilling from installing inside.As the expanded view of Fig. 2 (among the figure, the expanded view in left side) shown in, in order reliably to prevent oil leakage, also can the upside end face 9c of the upside end face 7b of outer diameter part 7 and downside end face 7c, first lip part 9, and the downside end face 10c of second lip part 10 form the overlay film 11 that forms by oil-proofing agent respectively.
First and second seal space S1, S2 have the pooling feature of volume-variation amount of the temperature variation of the lubricant oil that absorption is full of with the inner space at bearing components 6.In the scope of the temperature variation of supposing, pasta continues to be positioned at two seal space S1, S2.In order to realize this function, the summation of setting two seal space S1, S2 volume is at least greater than the volume-variation amount with the temperature variation of the lubricant oil that is full of in the inner space.
According to above situation, behind the interior week insertion shaft component 2 of bearing components 6 (inside diameter 8), be adhesively fixed at the regulation position of shaft component 2 first lip part 9 and second lip part 10 are to make it to clamp inside diameter 8.After such assembling finished, the inner space at the bearing components 6 that is sealed by two lip parts 9,10 also comprised for example being full of lubricant oil as lubricating fluid in the internal porosity of inside diameter 8.
The oiling of the lubricant oil of relevant hydrodynamic bearing device, for example the hydrodynamic bearing device of oiling state is immersed in the lubricant oil by inciting somebody to action not in vacuum tank, opens in barometric pressure afterwards and carries out.The hydrodynamic bearing device 1 of this configuration example is because the two ends of opening bearing components 6, so compare with the formation of closing the one end (with reference to patent documentation 1), can replace the air of inner space reliably with lubricant oil, thereby the adverse effect that can reliably avoid air pocket to bring, for example oil leakage during high temperature.In addition, not only can utilize the correction oil injection method of such decompression, and can under normal pressure, carry out oiling (for example, the pressurization oiling of lubricant oil), can simplify oiling device and operation, thereby realize cheapization of manufacture cost.
In addition, shown in this configuration example, relatively be formed centrally in the axle direction under the situation of symmetric shape roughly, might assemble mistakenly up and down at bearing components 6 (outer diameter part 7).Therefore, though diagram has been omitted, wish that outer circumferential face at outer diameter part 7 is formed with to distinguish identification sign up and down.Such identification sign for example can form when outer diameter part 7 is shaped.
In the hydrodynamic bearing device 1 of above-mentioned formation, when shaft component 2 was rotated, it was opposed by the outer circumferential face 2a and the radial bearing gap of shaft component 2 respectively to leave the zone that is arranged to two positions up and down of the radial bearing surface of the inner peripheral surface 8a of inside diameter 8.And along with the rotation of shaft component 2, the oil film that forms in the radial bearing gap can improve its oil film rigidity by the dynamic pressure effect of dynamic pressure groove, and radially rotates non-contact supporting axle member 2 freely.Thus, first R1 of radial bearing portion and second R2 of radial bearing portion of non-contact supporting axle member 2 are freely radially rotated in formation.
In addition, when shaft component 2 was rotated, the thrust-bearing gap and the downside end face 9b of first lip part 9 by regulation was opposed for the zone of the thrust bearing surface of the upside end face 8b of inside diameter 8; The thrust-bearing gap and the upside end face 10b of second lip part 10 by regulation is opposed for the zone of the thrust bearing surface of the downside end face 8c of inside diameter 8.And along with the rotation of shaft component 2, the oil film that forms in above-mentioned thrust-bearing gap can improve its oil film rigidity by the kinetic pressure effect of dynamic pressure groove, and rotates non-contact supporting axle member 2 freely along thrust direction.Thus, formation is rotated the first thrust bearing division T1 and the second thrust bearing division T2 of non-contact supporting axle member 2 freely along thrust direction.
As implied above, in the present invention,,,, can realize cheapization of manufacture cost by the simplification of manufacturing process and the reduction of cost of material so compare with the present formation of inside diameter being made sintering metal because inside diameter 8 and outer diameter part 7 all are resin system.In addition, form inside diameter, form outer diameter part by resin by sintering metal, compare with the present formation that both are adhesively fixed, because can the interface be applied dissolve by molten, thus bond strength between the two improved easily, thus the good hydrodynamic bearing device of shock-resistant load 1 can be provided.
Especially in this configuration example, oleoresin by porous matter forms the inside diameter 8 with radial bearing surface and thrust bearing surface, therefore when bearing operation, remain on lubricant oil in the inner emptying aperture to radially bearing play or thrust-bearing gap are oozed out, abundant lubricant oil can be supplied between these bearing playes thus, thereby can access high lubricity.The resinous inside diameter 8 of this porous matter, for example first injection moulding is mixed with the resin combination that pore forms material, thereafter, as long as removing pore formation material just can form, therefore, compare with the present formation of inside diameter 8 being made sintering metal system, simplify manufacturing process, thereby also can realize the cost degradation of hydrodynamic bearing device 1.And, owing to form outer diameter part 7, so can avoid also having constant intensity reduction by it outer diameter part that causes 7 and carriage 5 because of lubricant oil oozes out the oil leakage to bearing outside that causes from the emptying aperture of inside diameter 8 by non-porous matter resin.
As implied above, in hydrodynamic bearing device 1 of the present invention, bearing components 6 can low cost obtain, and, this bearing components 6 has high shock-resistant load, on the other hand, by the suitable resin combination of selecting to constitute inside diameter 8 outer diameter parts 7 resins, can realize the raising of greasy property thus and prevent the pollution of surrounding enviroment.
In addition, more than the oleoresin by porous matter is formed inside diameter 8 situation be illustrated, but also can be by not being that the oleoresin of the non-porous matter of porous matter forms inside diameter 8.Oleoresin as non-porous matter, for example can use so that lubricated composition (lubricant oil or lubricating grease) disperses to remain on the resin after state in the base resin is cured (sclerosis), can be not particularly limited employing kind for the resin of this composition and lubricant oil, lubricating grease.Object lesson as the resinous principle of such oleoresin, can enumerate the thermoplastic resin of extrahigh-molecular weight polyolefins, polyphenylene sulfide (PPS), liquid crystal polymer (LCP) etc., in addition, as the object lesson of lubricated composition, can enumerate the lubricant oil of mineral oil, synthetic hydrocarbon oil, ester oil etc.In addition, using thermoplastic resin, using under the situation of lubricating grease as lubricated composition simultaneously, the preferred lubricating grease that adopts with dropping point higher than the melting point of thermoplastic resin as resin.The various fillers that can in these resin materials, cooperate one or more reinforcing materials (no matter fibrous, Powdered etc. form) or oiling agent, conductive material etc. as required.
Though diagram has been omitted, in order to realize lower costization, when outer diameter part 7 is shaped, also can carriage shown in Figure 15 is integrally formed.In this case, staor winding 4a shown in Figure 1 is fixed on outer diameter part 7, if but form outer diameter part 7 by non-porous matter resin, just oil leakage can be prevented, and coming off of staor winding 4a can be prevented.
More than, a configuration example of hydrodynamic bearing device of the present invention is illustrated, but the present invention is not limited to above-mentioned hydrodynamic bearing device 1, also can preferably be applicable to the hydrodynamic bearing device of other modes.Below, the configuration example of other of convection cell bearing means describes, and has the identical reference number of member of formation key element use of identical functions effect with hydrodynamic bearing device shown in Figure 2, omits repeat specification.
Fig. 4 represents second configuration example of first mode of execution of hydrodynamic bearing device of the present invention.Be with the hydrodynamic bearing device shown in the figure 1 main difference point with configuration example shown in Figure 2, the either party's (second lip part 10 among Fig. 4) and the shaft component 2 of first lip part 9 and second lip part 10 is integrally formed.Thus, can suppress shaft component 2 and assembly precision lip part 10 between (for example, squareness) deviation, the accuracy control can easily assemble time of lip part 10 fixedly the time.
Fig. 5 represents the 3rd configuration example of first mode of execution of hydrodynamic bearing device of the present invention.Main difference point with hydrodynamic bearing device shown in the figure and configuration example shown in Figure 2 is, constitutes inside diameters 8 by the inside diameter 81 of upside and the inside diameter 82 of downside, but also is provided with the spacer ring portion 83 that imbeds the space between two inside diameters 81,82.In this configuration example, between the outer circumferential face 2a of the inner peripheral surface 81a of upside inside diameter 81 and shaft component 2, first R1 of radial bearing portion is set, between the outer circumferential face 2a of the inner peripheral surface 82a of downside inside diameter 82 and axial region 2a, second R2 of radial bearing portion is set.In addition, between the downside end face 9b of the upside end face 81b of upside inside diameter 81 and first sealing component 9, the first thrust bearing division T1 is set, between the upside end face 10b of the downside end face 81c of downside inside diameter 82 and second sealing component 10, the second thrust bearing division T2 is set.
Fig. 6 represents the 4th configuration example of first mode of execution of hydrodynamic bearing device of the present invention.Main difference point with hydrodynamic bearing device shown in the figure and above-mentioned configuration example is, be provided with first, second thrust bearing division T1, T2 at the two ends of being located at the lip part 10 on the shaft component 2, and seal space S only is arranged on the outer circumferential face 2a of shaft component 2 and is fixed between the inner peripheral surface 13a of sealing component 13 of upper end side inner peripheral surface 7a of outer diameter part 7, and the lower end side of bearing components 6 seals by lid member 12.In addition, in this configuration example, also can be the protruding lower end side that forms shaft component 2 spherically, and constitute thrust bearing division by the so-called trunnion bearing that utilizes this axle head of upper-end surface contact supporting that covers member 12.
Fig. 7 represents the 5th configuration example of first mode of execution of hydrodynamic bearing device of the present invention.Be with the main difference point of the hydrodynamic bearing device shown in the figure 1 with the formation of above configuration example, the second thrust bearing division T2 is arranged between the upside end face 7b of the downside end face 14a of the hub portion 14 of being fixed in shaft component 2 and outer diameter part 7, and seal space S is formed between the inner peripheral surface 14b of the outer circumferential face 7d of outer diameter part 7 and hub portion 14.
More than, the formation that forms bearing components 6 by deposited fixed inner diameter portion 8 and outer diameter part 7 is illustrated, but the formation method of bearing components is not limited to these methods.Specifically, its its inside diameter of bearing components and outer diameter part all can be formed by resin, and the either party of inside diameter or outer diameter part can embed and inject formation simultaneously.Below, the concrete configuration example of bearing components being made such hydrodynamic bearing device when constituting is described.
Fig. 8 represents first configuration example of second mode of execution of hydrodynamic bearing device of the present invention.Possesses the bearing components 26 of the shaft component 22 of rotary side and fixed side as main component parts with the hydrodynamic bearing device shown in the figure 21.
Inside diameter cylindraceous 28 that bearing components 26 is formed by the porous plastid (porous matter resin) by resin and the outer diameter part 27 that embeds this inside diameter 28 and utilize resin injection to be shaped constitute.By the inside diameter 28 that porous matter resin forms, for example after utilization is combined with the resin combination injection moulding of pore formation material, removes pore formation material by the solvent of water, alcohol etc. and form.In addition, concerning inside diameter 28 is shaped, except that above-mentioned injection moulding, also can use the method for compression forming, extrusion moulding, blow molding, vacuum forming, transmission shaping etc. according to the material of the shape of inside diameter 28 or selected resin etc.
Axially leave two zones up and down of the radial bearing surface that is set to first R1 of radial bearing portion and second R2 of radial bearing portion at the inner peripheral surface 28a of inside diameter 28, in these two zones, as the dynamic pressure generating unit, for example form dynamic pressure groove 28a1, the 28a2 of the herringbone shape shown in Fig. 9 (A) respectively.In illustrated example, dynamic pressure groove 28a1,28a2 are made with respect to the centrosymmetric shape of axle direction, but for example, dynamic pressure groove 28a1 central axis direction center with respect to upside, make the groove width axially of upper-side area bigger than the flute length of underside area, when shaft component 22 rotations, also can apply the power that is pressed into (pumping force) of below axially thus to lubricant oil.Dynamic pressure groove 28a1,28a2 also can be formed at the outer circumferential face 22a of opposed shaft component 22 by the radial bearing gap.The dynamic pressure groove shape is man type shape only not, also can form other shapes, for example forms the shape arbitrarily of spiral-shaped grade.
In addition, form the thrust bearing surface of the first thrust bearing division T1 at part or all annular section of the upside end face 28b of inside diameter 28, form the dynamic pressure generating unit in the zone that is this thrust bearing surface, and form for example spiral-shaped dynamic pressure groove 28b1 shown in Fig. 9 (B).Equally, form the thrust bearing surface of the second thrust bearing division T2 at part or all annular section of the downside end face 28c of inside diameter 28, form the dynamic pressure generating unit in the zone that is this thrust bearing surface, and form for example spiral-shaped dynamic pressure groove 28c1 shown in Fig. 9 (C).The dynamic pressure generating unit also can be by thrust-bearing gap and opposed, and promptly the upside end face 30b of the downside end face 29b of first lip part 29 and second lip part 30 forms.In addition, the dynamic pressure groove shape except that above-mentioned spiral-shaped, for example also can form the shape arbitrarily of herringbone shape etc.
As the base resin that is used to form inside diameter 28, it is desirable to, can injection moulding as long as satisfy, and satisfy desired heat resistance, oil resistance, mechanical strength etc., no matter thermoplastic resin, thermosetting resin can use, for example can use the plastics of one or more mixing that are selected from following illustrative general-purpose plastics, general engineering plastic and superpower engineering plastics, mix to the superpower engineering plastics of a kind of above-mentioned requirements characteristic good of major general.The various fillers that also can in base resin, cooperate one or more hardening agents or oiling agent, conductive material etc.
As operable general-purpose plastics, for example can enumerate: polyethylene (PP), polystyrene (PS), epoxy resin (EP) etc., in addition, as general engineering plastic, for example can enumerate: polyoxymethylene (POM), PETG (PET), polybutylene-terephthalate (PBT), polycarbonate (PC) (PC) etc.
In addition, as operable super engineering plastics, for example can enumerate: polyphenylene sulfide (PPS), polyether-ketone (PEK), polyether-ether-ketone (PEEK), Polyetherimide (PEI), polyether sulfone (PES), polyamidoimide (PAI), thermoplastic polyimide (TPI), Thermocurable polyimide, polyamide (PA), aromatic polyamides such as polyamide 6 T, polyamide 9T; Tetrafluoroethylene hexafluoropropylene copolymer (PFA), ethylene tetrafluoroethylene copolymer fluorine such as (ETFE) acrylic copolymer resin etc.
By dry blend, dissolve normally used mixing method in mixing etc. the mixed with resin, in above-mentioned base resin, make pore form material, filler mixes, and thus, generates resin combination (injection material).Form material as pore, dissolving in order to prevent to be shaped, can use the high melting point of forming temperature that has than selected base resin, cooperate this base resin and behind the shaping inside diameter 28, the pore that utilizes the solvent that do not dissolve base resin to remove forms material.Wherein, after can easily forming, especially preferred use removes the water-soluble of operation, and the alkalescent material that can use as rust preventing agent.
As the pore moulding material, can use Sodium Benzoate, sodium acetate, decanedioic acid sodium, sodium succinate or sodium stearate etc. to be inorganic alkaline metal salt of representative etc. as the organic alkali metal salt of representative and sodium carbonate, sodium molybdate, potassium molybdate, sodium tungstate, sodium tripolyphosphate, trisodium phosphate etc.Wherein, especially preferably improve the degrees of freedom of base resin and Sodium Benzoate, sodium acetate, the decanedioic acid sodium of water-soluble excellence with high-melting-point.These slaines only use a kind of, and in addition, it is two or more also can to mix use.Need to prove that the Mean particle diameter of the pore moulding material of use is preferably 0.1～500 μ m.This be because, when the particle diameter of pore moulding material, promptly the emptying aperture diameter that is formed at inside diameter 28 is that 0.1 μ m is when following, utilize lubricated oil surface tension lubricant oil successfully not supply with to the bearing play, when the emptying aperture diameter is that 500 μ m are when above, surface area diminishes, thereby can not obtain the cause of desirable bearing rigidity.
In addition, pore forms the cooperation ratio of material, with respect to the total amount that contains base resin, pore formation material and filler etc., be preferably 10vol%～90vol%, oil content is being suppressed under the situation of minimum, 10vol%～30vol% more preferably, in addition, increasing under the situation of oil content, more preferably 40vol%～60vol%.This is because if below 10vol%, just can not guarantee the emptying aperture fully measured if more than 90vol%, just can not obtain desired mechanical strength.
The base resin that constitutes outer diameter part 27 and inside diameter 28 are the same can injection moulding, as long as and satisfy desired heat resistance, oil resistance, mechanical strength etc., no matter thermoplastic resin, thermosetting resin can use, can use the plastics that are selected from one or more mixing of above-mentioned general-purpose plastics, general engineering plastic and superpower engineering plastics etc.The various fillers that can cooperate one or more reinforcing materials (no matter fibrous, Powdered etc. form) and oiling agent, conductive material etc. in base resin generate the resin combination that forms outer diameter part 27 thus.In this configuration example, the resin combination that forms outer diameter part 27 is generated as than the high melting point of resin combination that forms inside diameter 28.
As mentioned above, if form outer diameter part 27 by the resin combination higher than the melting point of inside diameter 28, then when outer diameter part 27 is shaped, as built in items, the surface (outer circumferential face 28d) that is disposed at the inside diameter 28 in the mould dissolves and becomes the state that dissolves combination, or become the male and fomale(M﹠F) shown in the expanded view (among the figure, the expanded view on right side) of Fig. 8.Therefore, the resin combination that injection comes enters the male and fomale(M﹠F) of outer circumferential face 28d, utilizes so-called anchoring to decide effect, and outer diameter part 27 and inside diameter 28 is mutual fastening strongly.Thus, obtain the bearing components 26 of excellent impact resistance.
In addition, in order further to improve the adhesive strength of outer diameter part 27 and inside diameter 28, when outer diameter part 27 is shaped, also can injecting resin, to make it to cover upper and lower end face 28b, the 28c of inside diameter 28.In addition, in order further to improve adhesive strength between the two,, for example also can use the inside diameter 28 (diagram is omitted) that is interrupted or is provided with continuously annular groove at outer circumferential face 28d as built in items.
In addition, omit diagram, but in this configuration example, use injection moulding mold injects shaping outer diameter part 27, this injection moulding mold inside is provided with the corresponding mold of each dynamic pressure groove shape with inner peripheral surface 28a, upside end face 28b and the downside end face 28c of inside diameter 28.As mentioned above, because outer diameter part 27 is formed than inside diameter 28 high resin combinations by melting point, so after inside diameter 28 was put into forming die, 28d was the same with outer circumferential face, can make each face 28a～28c of inside diameter 28 dissolve (softening), thereby imitate into the surface configuration of forming die.Like this, when outer diameter part 27 is shaped, can form above-mentioned each dynamic pressure groove 28a1,28a2,28b1,28c1.Like this, in this configuration example, owing to all embedding the shapes of having guaranteed desired bearing components 6 when being shaped, so,, thereby can form inside diameter 28 at low cost even its forming accuracy is low also out of question at the shaping stage of inside diameter 28.
Between the inner peripheral surface 27a of the upper end open portion of the outer circumferential face 29a of first lip part 29 and outer diameter part 27, form the first seal space S1 of specified volume, in addition, between the inner peripheral surface 27a of the lower ending opening portion of the outer circumferential face 30a of second lip part 30 and outer diameter part 27, form the second seal space S2 of specified volume.In this configuration example, the outer circumferential face 30a of the outer circumferential face 29a of first lip part 29 and second lip part 30 forms respectively towards the outer side of the bearing means conical surface shape of undergauge gradually.Therefore, two seal space S1, S2 conical surface shape for contracting along approximating direction (internal direction of bearing components 26) footpath.When shaft component 22 rotation, sucking action and the centrifugal force during rotation sucking action that cause of the lubricant oil in two seal space S1, the S2 by capillary force, the direction (internal direction of bearing components 26) that narrows down to seal space is attracted.Thus, can prevent effectively that lubricant oil from spilling from installing inside.In order reliably to prevent oil leakage, as the expanded view of Fig. 8 (among the figure, the expanded view in left side) shown in, also can form the overlay film 31 that forms by oil-proofing agent respectively at the upside end face 27b of outer diameter part 27 and downside end face 27c, the upside end face 29c of first lip part 29 and the downside end face 30c of second lip part 30.
First and second seal space S1, S2 have the function of the temperature variant volume-variation amount of lubricant oil that the inner space that is absorbed in bearing components 26 is full of.In the scope of the temperature variation of setting, pasta continues to be positioned at two seal space S1, S2.Pasta continues to be positioned at two seal space S1, S2.In order to realize this function, the summation of setting two seal space S1, S2 volume is at least greater than the volume-variation amount with the temperature variation of the lubricant oil that is full of in the inner space.
As mentioned above, insert shaft component 22 in interior week of bearing components 26 (inside diameter 28) after, first lip part 29 and second lip part 30 are adhesively fixed on the regulation position of shaft component 22, to make it to clamp inside diameter 8.After such assembling finished, the inner space at the bearing components 26 that is sealed by two lip parts 29,30 also comprised for example being full of lubricant oil as lubricating fluid in the internal porosity of inside diameter 28.
For the oiling of the lubricant oil of hydrodynamic bearing device, for example by in vacuum tank not the hydrodynamic bearing device of oiling state be immersed in the lubricant oil, in barometric pressure, open afterwards and carry out.The hydrodynamic bearing device 21 of this configuration example is because the two ends of opening bearing components 26, so compare with the formation of closing the one end (with reference to patent documentation 1), can replace the air of inner space reliably with lubricant oil, thereby the adverse effect that can reliably avoid air pocket to bring, for example oil leakage during high temperature.In addition, not only can utilize the correction oil injection method of such decompression, and can under normal pressure, carry out oiling (for example, the pressurization oiling of lubricant oil), can simplify oiling device and operation, thereby realize cheapization of manufacture cost.
In addition, shown in this configuration example, be formed centrally in respect to axle direction under the situation of symmetric shape roughly, might make a mistake up and down and assemble at bearing components 26 (outer diameter part 27).Therefore, though diagram is omitted, wish that outer circumferential face at outer diameter part 27 is formed with to distinguish identification sign up and down.Such identification sign for example can form when being shaped with outer diameter part 27.
Constituting in the hydrodynamic bearing device 21 that forms by above-mentioned, when shaft component 22 is rotated, in the zone of leaving setting for two positions up and down of the radial bearing surface of the inner peripheral surface 28a of inside diameter 28, outer circumferential face 22a by shaft component 22 and radial bearing gap and opposed respectively.And the oil film that is formed at above-mentioned radial bearing gap along with the rotation of shaft component 22 improves its oil film rigidity by the dynamic pressure effect of dynamic pressure groove, and radially rotates non-contact supporting axle member 22 freely.Thus, first R1 of radial bearing portion and second R2 of radial bearing portion of non-contact supporting axle member 22 are freely radially rotated in formation.
In addition, when shaft component 22 is rotated, for the downside end face 9b and the thrust-bearing gap of regulation by first lip part 29, the zone of the thrust bearing surface of the upside end face 28b of inside diameter 28 opposed, for the upside end face 30b and the thrust-bearing gap of regulation by second lip part 30, the zone of the thrust bearing surface of the downside end face 28c of inside diameter 28 opposed.And the oil film that is formed at above-mentioned thrust-bearing gap along with the rotation of shaft component 22 improves its oil film rigidity by the dynamic pressure effect of dynamic pressure groove, and radially rotates non-contact supporting axle member 22 freely.Thus, the first thrust bearing division T1 and the second thrust bearing division T2 of non-contact supporting axle member 22 are freely radially rotated in formation.
As implied above, in the present invention, because inside diameter 28 and outer diameter part 27 are resin, so compare with the present formation of inside diameter 28 being made sintering metal system, by the simplification of manufacturing process and the reduction of cost of material, can realize the cost degradation of bearing components 26.In addition, bearing components 26 is for embedding the bearing components of inside diameter 28 injection outer diameter parts 27.If embed the words that are shaped, then as long as improve the assembly precision that mould and die accuracy just can improve inside diameter 28 and outer diameter part 27, and, can in same operation, carry out the shaping of outer diameter part 27 and both assemblings, therefore from this point, also can realize the cost degradation of hydrodynamic bearing device 21.
In addition, in this configuration example, inside diameter 28 forms by the porous plastid of resin, the porous plastid of this resin, as mentioned above, utilize the resin that contains pore formation material to carry out injection moulding earlier, remove pore thereafter and form material, can form thus, and can make in the simple operation than sintering metal.Therefore,, compare, just can realize cheapization of manufacture cost with the present formation that forms inside diameter 28 by sintering metal as long as form inside diameter 28 by the porous plastid of resin.In addition, the porous plastid of resin can keep lubricated wet goods in the inside emptying aperture identical with sintering metal, therefore, but can low-cost provide long term maintenance high rotating hydrodynamic bearing device 21.
In the above description, the situation that forms inside diameter 28 by porous matter resin is illustrated, but also can forms inside diameter 28 by non-porous matter resin.In this case, it is desirable to, inside diameter 28 is formed by the so-called resin that contains that lubricant oil can not be supplied to the bearing play identical with porous matter resin.As oleoresin, for example can use with the state that in base resin, disperse to keep lubricated composition (lubricant oil or lubricating grease) and solidify oleoresin after (sclerosis), can be not particularly limited employing kind for the resin of this composition or lubricant oil, lubricating grease.As the concrete example of the resinous principle of such oleoresin, can enumerate the thermoplastic resin of polyolefin, polyphenylene sulfide (PPS), liquid-crystalline polymer (LCP) etc.In addition, as the object lesson of lubricated composition, can enumerate the lubricant oil of mineral oil, synthetic hydrocarbon oil, ester oil etc.In addition, using thermoplastic resin, using under the situation of lubricating grease as lubricated composition simultaneously, the preferred lubricating grease that adopts with dropping point higher than the melting point of thermoplastic resin as resin.The various fillers that can in these resin materials, cooperate one or more reinforcing materials (no matter fibrous, Powdered etc. form) or oiling agent, conductive material or the like as required.
In addition, in the above explanation, for passing through the resin combination shaping inside diameter 28 lower than the melting point of outer diameter part 27, and with the formation of inside diameter 28 as built in items injection moulding outer diameter part 27, but also can pass through the resin combination shaping outer diameter part 27 lower than the melting point of inside diameter 28, and with outer diameter part 27 as built in items injection moulding inside diameter 28.
In addition, omitted though illustrate, in order to realize lower cost, when injection moulding outer diameter part 27, also can carriage shown in Figure 15 is integrally formed.
The invention is not restricted to above-mentioned hydrodynamic bearing device 21, also can be preferably applied to the hydrodynamic bearing device of other modes.Below, the configuration example of other of convection cell bearing means describes, but has the identical reference number of member of formation key element use of identical functions effect with hydrodynamic bearing device shown in Figure 2, omits repeat specification.
Figure 10 represents second configuration example of second mode of execution of hydrodynamic bearing device of the present invention.The hydrodynamic bearing device 21 of this configuration example is with the main difference point of configuration example shown in Figure 8, and the either party's (second lip part 30 among Figure 10) and the shaft component 2 of first lip part 29 and second lip part 30 is integrally formed.Thus, can suppress shaft component 22 and installation precision lip part 30 between (for example, squareness) deviation, the accuracy control can easily assemble time of lip part 30 fixedly the time.Under this situation, except that make by metallic material the shaft component 22 and second lip part 30 integrally formed, also can form the mixed construction of second lip part 30 by resin material for form shaft component 22 by metallic material.
Figure 11 represents the 3rd configuration example of second mode of execution of hydrodynamic bearing device of the present invention.The main difference point of the hydrodynamic bearing device of this configuration example and configuration example shown in Figure 8 is, constitutes inside diameter 28 by the inside diameter 91 of upside and the inside diameter 92 of downside, is provided with the spacer ring portion 93 of burying the space between people's two inside diameters 91,92 at outer diameter part 27.In this configuration example, first R1 of radial bearing portion is arranged between the outer circumferential face 22a of the inner peripheral surface 91a of upside inside diameter 91 and shaft component 22, and second R2 of radial bearing portion is arranged between the outer circumferential face 22a of the inner peripheral surface 92a of downside inside diameter 92 and axial region 22.In addition, the first thrust bearing division T1 is arranged between the downside end face 29b of the upside end face 91b of upside inside diameter 91 and first sealing component 29, and the second thrust bearing division T2 is arranged between the upside end face 30b of the downside end face 92c of downside inside diameter 92 and second sealing component 30.
Figure 12 represents the 4th configuration example of second mode of execution of hydrodynamic bearing device of the present invention.The main difference point of this hydrodynamic bearing device 21 and Fig. 8, configuration example shown in Figure 10 is, first, second thrust bearing division T1, T2 are arranged on the two ends of the lip part of being located on the shaft component 22 30, and seal space S is only at the outer circumferential face 22a of shaft component 22 be fixed between the inner peripheral surface 33a of sealing component 33 of upper end side inner peripheral surface 27a of outer diameter part 27 and be provided with, and the lower end side of bearing components 26 seals by lid member 32.In addition, in this configuration example, also the lower end side of shaft component 22 can be formed protruding spherically, and constitute thrust bearing division by trunnion bearing, this trunnion bearing supports this axle head by the upper-end surface contact of cover member 32.
Figure 13 represents the 5th configuration example of second mode of execution of hydrodynamic bearing device of the present invention.Be with hydrodynamic bearing device shown in the figure 21 and the main difference point of formation of mode shown in above, the second thrust bearing division T2 is arranged between the upside end face 27b of the downside end face 34a of the hub portion 34 of being fixed in shaft component 22 and outer diameter part 27, and seal space S is arranged between the inner peripheral surface 34b of the outer circumferential face 27d of outer diameter part 27 and hub portion 34.
In the above description, as the R1 of radial bearing portion, R2, illustration make the formation of lubricant oil generation dynamic pressure effect by herringbone shape or spiral-shaped dynamic pressure groove, but, also can adopt so-called arc bearing or step bearing as the R1 of radial bearing portion, R2.Many arc bearings or step bearing are the bearing that is respectively equipped with the formation of a plurality of arc surfaces or axle direction groove for the zone of radial bearing surface (diagram is omitted).
In the above description, shown in radial bearing R1, R2, for being provided with the formation of radial bearing portion at axial two positions, but also can be at an axial position, or three formations that are provided with radial bearing portion more than the position.
A side or the both sides of thrust bearing division T1, T2, for example also can pass through in the zone that is thrust bearing surface, along the circumferential direction be provided with the dynamic pressure groove of a plurality of radial direction groove shape, so-called step bearing, so-called wave mode bearing formations such as (stepped ramp type become the bearing of wave mode) with predetermined distance.
In the above description, represented to constitute the two mode of the R1 of radial bearing portion, R2, but also can constitute either party or the both sides' (diagram is omitted) of the radial bearing R1 of portion, R2 by positive circular journal bearing by hydraulic bearing.
In the above description, as the inside that is filled in hydrodynamic bearing device 1,21, and be filled in the radial bearing gap between inside diameter and the shaft component or the fluid in the thrust-bearing gap between inside diameter and the shaft component (two lip parts), illustration lubricant oil, but except that lubricant oil, for example also can use the gas of air etc. or magnetic fluid etc.
Claims (6)
1. hydrodynamic bearing device, it possesses:
Bearing components, the outer diameter part that it possesses the inside diameter with radial bearing surface and has the attachment face of installing with other members;
Radial bearing portion, its utilization is formed on the oil film in the radial bearing gap that radial bearing surface faces and the axle of Zhi Chengying supporting diametrically is characterized in that,
The inside diameter and the outer diameter part of bearing components are resin system, utilize different resin to form inside diameter and outer diameter part, and the inner peripheral surface fusion of outer circumferential face by deposited inside diameter that will be mutual relative and outer diameter part and combination.
2. hydrodynamic bearing device, it possesses:
Bearing components, the outer diameter part that it possesses the inside diameter with radial bearing surface and has the attachment face of installing with other members;
Radial bearing portion, its utilization is formed on the oil film in the radial bearing gap that radial bearing surface faces and the axle of Zhi Chengying supporting diametrically is characterized in that,
The inside diameter and the outer diameter part of bearing components are resin system, utilize different resin to form inside diameter and outer diameter part, and with the low-melting side in inside diameter or the outer diameter part as built in items and injection moulding the opposing party.
3. hydrodynamic bearing device as claimed in claim 1 or 2 is characterized in that,
Radial bearing surface at inside diameter is provided with the dynamic pressure generating unit, and this dynamic pressure generating unit makes the radial bearing gap that hydrodynamic take place.
4. hydrodynamic bearing device as claimed in claim 1 or 2 is characterized in that,
Inside diameter is formed by oleoresin.
5. hydrodynamic bearing device as claimed in claim 1 or 2 is characterized in that,
Inside diameter is a porous plastid.
6. hydrodynamic bearing device as claimed in claim 1 or 2 is characterized in that, outer diameter part is non-porous plastid.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006059868A JP5005235B2 (en) | 2006-03-06 | 2006-03-06 | Hydrodynamic bearing device |
| JP059868/2006 | 2006-03-06 | ||
| JP086137/2006 | 2006-03-27 | ||
| JP2006086137A JP5005242B2 (en) | 2006-03-27 | 2006-03-27 | Hydrodynamic bearing device |
| PCT/JP2007/053139 WO2007102312A1 (en) | 2006-03-06 | 2007-02-21 | Fluid bearing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101400908A CN101400908A (en) | 2009-04-01 |
| CN101400908B true CN101400908B (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800082777A Expired - Fee Related CN101400908B (en) | 2006-03-06 | 2007-02-21 | Fluid bearing device |
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| JP (1) | JP5005235B2 (en) |
| CN (1) | CN101400908B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101830071A (en) * | 2010-04-15 | 2010-09-15 | 南通杰西电器有限公司 | Treating process for drive mechanism connecting rod of micro-compressor |
| JP2014137088A (en) * | 2013-01-16 | 2014-07-28 | Nippon Densan Corp | Bearing device, motor, and blower fan |
| CN104231948B (en) * | 2014-08-20 | 2016-01-13 | 上海交通大学 | Pressurising deformation type bearing outer ring liner adhering method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4152712B2 (en) * | 2002-10-08 | 2008-09-17 | Ｎｔｎ株式会社 | Hydrodynamic bearing device and manufacturing method thereof |
| JP2004190786A (en) * | 2002-12-11 | 2004-07-08 | Ntn Corp | Dynamic-pressure bearing device and manufacturing method therefor |
| JP4476670B2 (en) * | 2004-03-30 | 2010-06-09 | Ｎｔｎ株式会社 | Hydrodynamic bearing device |
| JP2004301338A (en) * | 2004-07-27 | 2004-10-28 | Ntn Corp | Dynamic pressure type sintering oil impregnation bearing unit |
| JP4628720B2 (en) * | 2004-08-03 | 2011-02-09 | Ｎｔｎ株式会社 | Housing for hydrodynamic bearing device, hydrodynamic bearing device including the same, and motor having the hydrodynamic bearing device |
| JP2005337490A (en) * | 2005-01-18 | 2005-12-08 | Ntn Corp | Dynamic pressure bearing device |
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2006
- 2006-03-06 JP JP2006059868A patent/JP5005235B2/en not_active Expired - Fee Related
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| JP5005235B2 (en) | 2012-08-22 |
| JP2007239794A (en) | 2007-09-20 |
| CN101400908A (en) | 2009-04-01 |
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