CN105298898B - Hydrodynamic bearing and the fan structure and its assemble method using hydrodynamic bearing - Google Patents

Abstract

The present invention discloses a kind of hydrodynamic bearing and the fan structure and its assemble method using hydrodynamic bearing, wherein the hydrodynamic bearing includes：One bearing body, a bearing fixed part, an accumulator, a bottom and a rotating shaft；Wherein bearing body has a shaft hole, and the madial wall of shaft hole is provided with multiple chevron shaped Oil Guide grooves, and rotating shaft is revolvably sleeved in shaft hole；Bearing fixed part is connected to the bottom of bearing body with being integrally formed, bearing fixed part has a composition surface, and engaged by composition surface with a fixed seat, so that bearing fixed part is fixed in fixed seat, accumulator is located at the bottom of bearing fixed part simultaneously, and bottom is arranged at an opening of accumulator, and accumulator is closed.

Description

Hydrodynamic bearing and the fan structure and its assemble method using hydrodynamic bearing

Technical field

The present invention is a kind of fan knot for being suitable for hydrodynamic bearing that radiating fan system uses and using hydrodynamic bearing Structure and its assemble method.

Background technology

Press, radiator fan is one of primary clustering in radiating module.And it is in recent years cooperation notebook computer, tablet personal computer The trend constantly constantly lifted towards miniaturization, thin type and processor operation power Deng information products so that radiating module Must with towards miniaturization, thin type and to take into account simultaneously radiating efficiency lifting direction develop.Hence in so that radiating module The fan of use, it is also necessary to reduce volume, reduce thickness while lift rotation speed of the fan again.Be miniaturized to adapt to fan, Slimming and high-revolving demand, current considerable radiator fan, which has changed, to be adopted the design of hydrodynamic bearing and substitutes traditional axle Hold.

As shown in Figure 10, it is a kind of conventional fan structure using hydrodynamic bearing, including：One fan drum 1；One Bearing arrangement 2, it is arranged on the bottom plate 1a of the radiator shell 1；One fan blade 3, the fan blade 3 are arranged at one The upper end of the rotating shaft 6 of individual bearing arrangement 2.A rotor 4 is further provided with fan blade 3 and at the bottom of fan drum 1 A stator 5 is provided with plate, is cooperated by rotor 4 and stator 5, the magnetic field that can produce mutual exclusion promotes fan blade 3 to produce Rotation centered on rotating shaft 6.As shown in Figure 10, the bearing arrangement 2 of the known technology includes：One 7, one, axle sleeve is set In the rotating shaft 6 that the hydrodynamic bearing 8 among axle sleeve 7 and one are disposed through in hydrodynamic bearing 8.

Wherein, hydrodynamic bearing 8 is the inside for being set in axle sleeve 7, and hydrodynamic bearing 8a is fixed on into axle using a pressure ring 8a Cover inside 7, then be fixed on by axle sleeve 7 on the bottom plate 1a of fan drum 1.The bottom of axle sleeve 7 has the bottom plate 7a of a closing, bottom A spacing is kept between the bottom surface of plate 7a and hydrodynamic bearing 8, to form an accumulator 9, and in being filled with lubricating oil in the accumulator 9 Fat.

When the fan is operating, rotating shaft 6 rotates to drive lubricant grease and entered between shaft hole and the rotating shaft of hydrodynamic bearing 8 Gap in.The madial wall of the shaft hole of hydrodynamic bearing 8 is provided with most oil guide grooves, passes through the guide function of oil guide groove so that Lubricant grease in shaft hole surface flow and be concentrically formed pressure, therefore formed one between shaft hole and the surface of rotating shaft 6 The oil film with pressure, pass through the bracing force of oil film so that rotating shaft 6 will not contact shaft hole when rotating, and reduce it Frictional force.

In conventional hydrodynamic bearing structure, its hydrodynamic bearing 8 is to transfer to be fixed on the bottom plate of fan drum 1 by axle sleeve 7 On 1a, while the accumulator 9 of the bottom of hydrodynamic bearing 8 is molded on axle sleeve 7, hence in so that described axle sleeve 7 turns into what is commonly used An indispensable element in hydrodynamic bearing structure.But this kind of conventional hydrodynamic bearing structure but there are lower column defects：

1st, because hydrodynamic bearing 8 must be set in the inside of axle sleeve 7, and need further to set to by hydrodynamic bearing The solid pressure ring 8a in axle sleeve of pressure, therefore number of parts increase will be caused, and improve cost.

2nd, hydrodynamic bearing 8 must be set in the inside of axle sleeve 7 so that the diameter of hydrodynamic bearing 8 must reduce, also related to make Hydrodynamic bearing shaft hole and the diameter of rotating shaft 6 must also reduce, hence in so that the shaft hole of conventional hydrodynamic bearing with The diameter of rotating shaft 6 is restricted, and reduces the oil film loaded area between its rotating shaft 6 and shaft hole, and it is steady to have influence on its operating It is qualitative.

3rd, hydrodynamic bearing 8 is first sleeved on inside axle sleeve 7 and is fixed on again via axle sleeve 7 on bottom plate 1a, therefore can produce dual Fit tolerance make it that the central axis of the shaft hole of hydrodynamic bearing 8 is easily crooked so that rotating shaft 6 and fan blade 3 Axis of rotation deflection, cause vibrations and the noise of operating.

4th, conventional hydrodynamic bearing is that hydrodynamic bearing 8 is fixed on inside axle sleeve 7 using pressure ring 8a.But if to compel The pressure ring 8a of tight hydrodynamic bearing 8 is released or not fastened really, will cause hydrodynamic bearing 8 produces with axle sleeve 7 to rotate against.

5th, conventional hydrodynamic bearing 8 is linked in the inside of axle sleeve 7, but at present because the knot of radiator fan miniaturization Fruit, the size of hydrodynamic bearing 8 is also quite tiny, as long as it is slightly oppressed by axle sleeve 7, can cause turning for hydrodynamic bearing 8 The size or out of roundness of axis hole are affected, and so the gap size between the shaft hole of hydrodynamic bearing 8 and rotating shaft 6 will be caused to produce The raw error either uneven situation in gap, will cause oil film not establish, so that situation generation is easily worn in rotating shaft.

6th, it is to utilize etching mode, or mould that the forming method of the Oil Guide groove in the hydrodynamic bearing structure commonly used in addition is most Modeling molding mode forms described Oil Guide groove in the shaft hole madial wall of hydrodynamic bearing, but in conventional manufacture method, all The size of Oil Guide groove and the precision of depth can not be accurately controlled, hence in so that hydrodynamic bearing can not effectively set up oil film.

Due to factors above so that the hydrodynamic bearing structure of conventional radiator fan has quite a lot of shortcoming, therefore, how By the improvement of structure design, carry out the hydrodynamic bearing structure run stability of heat radiation fan, to overcome the defects of above-mentioned, Turn into one of described item cause important topic to be solved.

The content of the invention

Present invention is primarily aimed at providing one kind to simplify construction, increase the dynamic pressure shaft of hydrodynamic bearing run stability Hold and fan structure and its bearing localization method using the bearing.

Wherein, the hydrodynamic bearing includes：One bearing body, one located at bearing body bottom bearing fixed part, one set Accumulator, a bottom and a rotating shaft in bearing fixed part.

Wherein, the center of bearing body has a shaft hole for penetrating bearing body, and in the interior sidewall surface of shaft hole Provided with multiple Oil Guide grooves.In a preferred embodiment, the Oil Guide groove of shaft hole internal face can be herringbone groove.The bearing Fixed part is connected to the bottom of bearing body with being integrally formed, and bearing fixed part has a side for being surrounded on the bearing fixed part The composition surface in face, the composition surface are engaged with a fixed seat so that the bearing fixed part is fixed in the fixed seat.It is described Accumulator is communicated in the bottom of the shaft hole and diameter is more than the shaft hole, and its bottom is provided with an opening, and the bottom The opening is covered on, accumulator is closed.The rotating shaft is disposed through in shaft hole, and the bottom of rotating shaft is resisted against The top surface of the bottom.

Wherein, lubricant grease is filled with the accumulator, when the rotating shaft rotates, described in the lubricant grease entrance In gap between rotating shaft and the shaft hole, and guide the lubricant grease to flow by the Oil Guide groove and produce pressure Power, to form the oil reservoir between the rotating shaft surface and the shaft hole.

In the preferred embodiment of the present invention, wherein the accumulator is surrounded on the summit portion with a summit portion and one Sidewall sections, the bottom is placed in the inner edge of the sidewall sections, and the top surface of the bottom has one upward convex Edge, the apical margin of the flange are contacted with the summit portion of the accumulator.

In the preferred embodiment of the present invention, have one between the summit portion of the apical margin of the flange portion and the accumulator Minim gap, and it is provided with a notch part in a side of the bottom plate, the gas in the accumulator is sequentially by described small Gap and the notch part, to be passed to the outside of the accumulator.The flange and the summit portion, which are coated with, simultaneously dials Finish so that the minim gap between the flange and the summit portion is only for the gas by preventing the storage The stored lubricant grease passes through in grease chamber.

In the preferred embodiment of the present invention, the plurality of Oil Guide groove is the turning cutter-edge formation using a molding cutter Turning is carried out in the interior sidewall surface of the shaft hole to be formed, the both ends of each Oil Guide groove have one to enter the edge of a knife respectively And one go out the edge of a knife, the Oil Guide groove is entered into and exited from for the turning cutter-edge formation of the turning molding cutter.

In the preferred embodiment of the present invention, wherein the top surface of bottom can be provided with a wear plate, or the bottom is using resistance to Grind wear-resisting bottom made of material.

The present invention provides a kind of fan structure using above-mentioned hydrodynamic bearing again, wherein the fan structure mainly includes one Bottom plate, a fan blade, a rotor, a stator and a hydrodynamic bearing assembly.Wherein hydrodynamic bearing assembly have a bearing body, One located at bearing body bottom bearing fixed part, one be located at bearing fixed part accumulator, a bottom and a rotating shaft.Its axis Holding the center of body has one to penetrate the shaft hole of bearing body, and is provided with multiple Oil Guide ditches in the interior sidewall surface of shaft hole Groove.In a preferred embodiment, the Oil Guide groove of shaft hole internal face can be herringbone groove.The bearing fixed part is integrally formed Ground is connected to the bottom of bearing body, and bearing fixed part has the composition surface of a side for being surrounded on the bearing fixed part, institute State composition surface to engage located at the bottom plate upper fixed seat with one so that the bearing fixed part is fixed in the fixed seat.Institute To state accumulator and be communicated in the bottom of the shaft hole and its bottom and be provided with an opening, the bottom is covered on the opening, with Accumulator is closed.The rotating shaft is disposed through in shaft hole, and is resisted against the top surface of the bottom.

The fan blade is fixed on the top surface of the rotating shaft, and the stator is fixedly installed on the outer of the bearing body Side, the rotor are arranged at the medial surface of the fan blade, and are surrounded on the outside of the stator.

The magnetic field of mutual exclusion is produced by the rotor and stator can make the fan blade and the rotating shaft produce rotation, And attracted each other by the magnetic force of rotor and stator, make the rotating shaft keep being sleeved in the shaft hole of the bearing body.

The present invention furthermore provides a kind of assemble method of the fan structure using hydrodynamic bearing, including following step Suddenly：One bearing number of assembling steps, by the bottom cover device in the accumulator of the bottom of the bearing body, and by the bearing sheet Body is installed on the fixed seat of the bottom plate with press-fit manner.Stator group fills step, and the stator pack is loaded on into the bottom plate Or on the bearing body.One rotor number of assembling steps, is assembled the rotor onto on the fan blade.One fan assembling walks Suddenly, the fan blade is assembled in the rotating shaft top.One oiling step, lubricant grease is noted from the shaft hole of bearing body Enter in the accumulator.And a number of assembling steps, the rotating shaft for being assembled with the fan blade is inserted into the bearing sheet In the shaft hole of body, and attracted each other by the rotor and the magnetic force of the stator to each other by the rotating shaft together with wind Fan leaf is fixed on the bearing body.

The main efficacy results of the present invention are：

1st, in the hydrodynamic bearing assembly that fan structure of the invention uses, bearing body is integrally formed with bearing fixed part, Accumulator is directly shaped in the bottom of bearing body again simultaneously, hence in so that bearing body is without the use of axle sleeve, therefore Shaft hole and shaft diameter are increased, and cause rotating shaft that there is larger oil film loaded area, and it is steady to improve its operating It is qualitative, and reduce beat.

2nd, because bearing body is directly mounted in the fixed seat of bottom plate, bearing body directly can be arranged on determining for bottom plate On position, due to saving except the position error of axle sleeve so that the positioning of bearing body and shaft hole can be more accurate, and can Avoid the situation of spindle central deflection from producing, therefore can effectively reduce the vibrations of the fan running caused by rotating shaft deflection and noise Situation.

3rd, non-fit axle sleeve on the outside of bearing body of the invention, therefore bearing body is not oppressed by axle sleeve, while bearing Body design is not overlapping with shaft hole into bearing fixed part and fixed seat fit position, therefore bearing body can be avoided to suffer oppression and made The situation deformed into shaft hole dimensional discrepancy and out of roundness produces, it is thus ensured that the gap size between shaft hole and rotating shaft is kept Oil film can be set up in critical field, and when being able to ensure that rotating shaft operating.

4th, the present invention uses is molded Oil Guide groove in a manner of molding cutter turning, can accurately control each Oil Guide groove Shape and path, therefore can more effectively reach guiding lubricant grease flowing to form the purpose of the oil film with pressure.

For the enabled feature and technology contents for being further understood that the present invention, refer to below in connection with the present invention specifically Bright and accompanying drawing, but institute's accompanying drawings are only provided and used with reference to explanation, are not used for the present invention person of being any limitation as.

Brief description of the drawings

Fig. 1 is hydrodynamic bearing of the present invention and the combination diagrammatic cross-section using the hydrodynamic bearing fan structure.

Fig. 2 is the hydrodynamic bearing of the present invention and the enlarged fragmentary cross section using the hydrodynamic bearing fan structure.

Fig. 3 is the profile for the hydrodynamic bearing body that the present invention uses.

Fig. 4 is the top view for the bottom that the present invention uses.

Fig. 5 is the sectional side view for the bottom that the present invention uses.

Fig. 6 is the hydrodynamic bearing body of the present invention and the combination section of another alternate embodiment of bottom.

Fig. 7 is the schematic diagram of the Oil Guide groove forming method of the shaft hole inwall of the hydrodynamic bearing body of the present invention.

Fig. 8 is the hydrodynamic bearing of second embodiment of the invention and shown using the combination section of the fan structure of the hydrodynamic bearing It is intended to.

Fig. 9 is assembly program flow chart of the present invention using the fan structure of the hydrodynamic bearing.

Figure 10 is the combination diagrammatic cross-section of the conventional fan structure using hydrodynamic bearing.

【Symbol description】

Blower-casting 1

Bottom plate 1a

Bearing arrangement 2

Fan blade 3

Rotor 4

Stator 5

Rotating shaft 6

Housing 7

Bottom plate 7a

Hydrodynamic bearing 8

Pressure ring 8a

Accumulator 9

Fan structure 10

Bottom plate 11

Fixed seat 12

Fan blade 13

Rotor 14

Stator 15

Hydrodynamic bearing assembly 20

Bearing body 21

Shaft hole 22

Oil Guide groove 23

Enter the edge of a knife 231

Go out the edge of a knife 232

Isolation channel 233

Bearing fixed part 24

Composition surface 241

Accumulator 25

Summit portion 251

Sidewall sections 252

Bottom 26

Flange 261

Notch part 262

Wear-resistant pad 263

Rotating shaft 30

Molding cutter 40

Cutter-edge formation 41

Embodiment

(first embodiment)

The present invention provides a kind of hydrodynamic bearing and the fan structure using the hydrodynamic bearing, as shown in figure 1, making for one With the combination section of the fan structure 10 of the hydrodynamic bearing of the present invention, wherein fan structure 10 includes a bottom plate 11, a fan Blade 13, a rotor 14, a stator 15 and a hydrodynamic bearing assembly 20.

Wherein hydrodynamic bearing assembly 20 is installed on a fixed seat 12 on bottom plate 11, and the fan blade 13 is installed on institute State the upper end of a rotating shaft 30 of hydrodynamic bearing assembly 20.The stator 15 is fixedly installed in the outside of hydrodynamic bearing assembly 20, The rotor 14 is installed on the inner side of fan blade 13, and is surrounded on the outside of stator 15.The rotor 14 can with stator 15 Produce the magnetic field of mutual exclusion and drive fan blade 13 to produce rotation.

As shown in Fig. 2 the hydrodynamic bearing assembly 20 of the present invention includes：One bearing body 21, a rotating shaft 30, one are located at axle Hold accumulator 25 and one opening located at accumulator of the bearing fixed part 24, one located at the bottom of bearing fixed part 24 of the bottom of body 21 Bottom 26 at mouthful.

As shown in Fig. 2 the wherein bearing body 21 of hydrodynamic bearing assembly 20 of the present invention is a cylinder, bearing body 21 Center have and one penetrate the shaft hole 22 of bearing body 21, and be provided with multiple Oil Guide grooves in the interior sidewall surface of shaft hole 22 23.In the described embodiment, the Oil Guide groove 23 of the internal face of shaft hole 22 can be herringbone groove.

The bearing fixed part 24 is connected to the bottom of bearing body 21, the side ring of bearing fixed part 24 with being integrally formed A composition surface 241 is arranged with, the composition surface 241 can be engaged with the fixed seat 12 of the bottom plate 11 with press-fit manner, therefore So that the bearing body 21 can be fixedly connected in fixed seat 12 by the bearing fixed part 24.

Meanwhile bearing fixed part 24 of the invention has following further feature：The bearing fixed part 24 is arranged at axle Hold the bottom of body 21, at the same the position that is engaged with the fixed seat 12 of bottom plate 11 of the bearing fixed part 24 not with bearing body 21 Shaft hole 22 it is overlapped, therefore when bearing fixed part 24 and fixed seat 12 are engaged with press-fit manner, bearing fixed part 24 by fixed seat 12 when being extruded and being deformed, and the aperture of shaft hole 22 will not be caused to produce change or cause shaft hole 22 Out of roundness wrecks, and to avoid the gap between rotating shaft 30 and shaft hole 22 from producing unexpected change, causes rotating shaft 30 During rotation, the situation that oil film can not be established between shaft hole 22 and the gap of rotating shaft 30 produces.

Meanwhile the accumulator 25 is located at the bottom of bearing fixed part 24, and connected with the bottom of the shaft hole 22, and Have a diameter larger than the shaft hole 22.The bottom of accumulator 25 is provided with an opening, and the bottom 26 is covered on opening for accumulator 25 At mouthful, accumulator 25 is closed.The rotating shaft 30 is disposed through in shaft hole 22, and the bottom of rotating shaft 30 be resisted against it is described The top surface of bottom 26.

As shown in Fig. 2 the top of rotating shaft 30 is fixedly connected with a tumbler, and in the embodiment, the tumbler on the top of rotating shaft 30 For fan blade 13, but as when the hydrodynamic bearing of the present invention applies to other devices (such as：Disc unit, CD player etc.), then this turn Moving part can be the rotating mechanism of other devices.The bottom of rotating shaft 30 is provided with the end of an arc-shaped, and in the top surface of bottom 26 One is provided with using wear-resistant pad 263 made of wear-resistant material so that can subtract when the end of rotating shaft 30 is resisted against the top surface of bottom 26 Its few frictional force, and avoid rotating shaft 30 and bottom 26 from wearing.Described bottom 26 in top surface shown in Fig. 2 except setting wear-resistant pad , also can be as shown in Figure 6 by bottom 26 using wear resistant plastic material (such as Teflon, wear-resisting engineering plastic material) system beyond 263 Into making itself that just there is wearability.

After shown accumulator 25 is sealed by bottom 26, lubricant grease can be filled in portion in the inner.When the rotating shaft rotates, Lubricant grease in accumulator enters in the gap between rotating shaft 30 and shaft hole 22, and is guided and moistened by the Oil Guide groove 23 Lubricating oil fat flows and produces pressure, to form the oil reservoir between the surface of rotating shaft 30 and the shaft hole 22.Due to this One oil reservoir has pressure, therefore sustainable rotating shaft 30 rotates, and makes to be not exposed to shaft hole 22 during its rotation, with reduce rotating shaft 30 with The abrasion that bearing body 21 operates.

As shown in Fig. 2 wherein described accumulator 25 is the circular shrinkage hole for being arranged on the bottom surface of bearing fixed part 24, it has one Summit portion 251 and one is surrounded on the sidewall sections 252 of the side of summit portion 251, and the bottom 26 is placed in the side of sidewall portion The inner edge divided.

As shown in Figures 4 and 5, the top surface of the bottom has a upward flange 261, the top of the flange 261 Edge is contacted with the summit portion 251 of the accumulator 25.The height and the height of accumulator 25 of the flange 261 approach, therefore A barrier wall that lubricant grease can be prevented to expose from the opening of accumulator 25 can be formed.The bottom 26 and accumulator of the present invention It is further provided with being available for the internal gas of accumulator 25 to escape depressed structure with what the external world circulated between 25.Described depressed structure of escaping includes Retain the side of a minim gap and the bottom 26 between the apical margin of the flange 261 and the summit portion of accumulator 25 Side is provided with a notch part 262, and the gas in the accumulator is sequentially by between small between flange 261 and summit portion 251 Gap and the notch part 262, to be passed to the outside of the accumulator 25.

To prevent minim gap leakage of the lubricant grease between flange 261 and summit portion 251, flange 261 of the present invention Gap size between summit portion 251 is controlled in very small scope, it is however generally that the size of the minim gap is situated between Oil extracticn agent is coated with the range of 1-3 μm, while in flange 261 and summit portion 251 so that the flange and the top surface The minim gap between part is only for the gas inside accumulator by but can prevent lubricant grease from described micro- simultaneously again Small―gap suture by, therefore reach at the same take into account barrier lubricant grease leakage, while be available for again gas circulate purpose.

The bearing body 21 of the present invention uses above-mentioned design, it is main the characteristics of be that described bearing body 21 itself is integral Shaping is provided with bearing fixed part 24, can be directly fixed on by bearing fixed part 24 in the fixed seat 12 of bottom plate 11, while in axle Hold and be integrally formed on body 21 provided with accumulator 25, therefore can not fully need axle sleeve, fixing bearing body can be reached simultaneously Establish the purpose of oil storage space.

Due to the element of axle sleeve can be eliminated in hydrodynamic bearing assembly 20, therefore maintaining the identical of hydrodynamic bearing assembly 10 On the premise of external diameter, bearing body 21 is because eliminate the thickness shared by axle sleeve so that and the external diameter of bearing body 21 can expand, Also it is related to cause shaft hole 22 and the diameter increase of rotating shaft 30, hence in so that the oil between the rotating shaft 30 of the present invention and shaft hole 22 Film loaded area increase, and the rotating shaft 30 made operate it is more stable.

Another feature of bearing body of the present invention, it is the Oil Guide groove 23 of the interior sidewall surface of shaft hole 22 of bearing body 21 It is to be molded with turning technological means, compared to the conventional technological means being molded in a manner of etching or be molded, can also reaches To the size of accurate control Oil Guide groove 23 and the purpose of geometry.As shown in fig. 7, Oil Guide groove 23 of the present invention into Type mode, to go out described Oil Guide groove in the madial wall turning of shaft hole 22 of bearing body 21 using a molding cutter 40. The side of the molding cutter 40 has the mode of its turning of at least one cutter-edge formation 41 to stretch out, its molding mode As shown in fig. 7, being to be extend into using molding cutter 40 inside the shaft hole 22 of bearing body 21, and control molding cutter 40 and axle The shaft hole 22 for holding body 21 produces axial relative motion, while the cutter-edge formation 41 of molding cutter 40 touches shaft hole 22 Madial wall, while control the cutter-edge formation 41 of molding cutter 40 and shaft hole 22 to produce centered on the axle center of the shaft hole Relative crankmotion so that cutter-edge formation 41 produces in the madial wall of shaft hole 22 to be consistent with the Oil Guide groove 23 Lambdoid relative movement path, and the madial wall turning in shaft hole 22 goes out described Oil Guide groove 23.

The present invention is each described Oil Guide ditch using feature possessed by the Oil Guide groove 23 made by this mode Groove 23 respectively have one positioned at the Oil Guide groove 23 one end enter the edge of a knife 231 and one is located at each described Oil Guide The end of groove 23 goes out the edge of a knife 232, enters or exit the two of the Oil Guide groove 23 for the cutter-edge formation of the molding cutter End.

The cutter-edge formation 41 for the molding cutter 40 that the present invention uses is molded via Precision Machining mode, therefore can be accurately Control the cross sectional shape and size of each Oil Guide groove.Simultaneously the present invention can arrange in pairs or groups specific purpose tool machine either Numerical Control work Tool machine is precisely controlled to the cutter-edge formation 41 of type cutter 40 in the turning path of the inwall of shaft hole 22, therefore can accurately control The path of Oil Guide groove 23, therefore the precision of the Oil Guide groove 23 of the present invention is improved, and make it that the hydrodynamic bearing of the present invention is total Into 20 in the running, purpose more caused by Precise Control of Oil film can be reached.

See also shown in Fig. 9, for the assembly program of the fan structure 10 using hydrodynamic bearing of the present invention, its assembly program Comprise the following steps：

S1, bearing number of assembling steps：By the bottom cover device in the accumulator of the bottom of the bearing body, and by described in Bearing body is installed on the step of fixed seat of the bottom plate with press-fit manner.

S2, stator number of assembling steps：By the stator pack loaded on the bottom plate or the bearing body.

S3, rotor number of assembling steps：Assemble the rotor onto on the fan blade；

S4, fan assembling step：The fan blade is assembled in the rotating shaft top.

S5, oiling step：Lubricant grease is injected in the accumulator from the shaft hole of bearing body.

S6, combination step：The rotating shaft for assembling fan blade is inserted into shaft hole together with fan blade.

(second embodiment)

As shown in figure 8, being second embodiment of the invention, second embodiment is Technology application of the invention in thicker radiation air Fan the embodiment of module.Fan structure 10 and hydrodynamic bearing assembly 20 in the embodiment have higher height, meanwhile, axle The height of body 21 and rotating shaft 30 is held also greater than the bearing body 21 of first embodiment and the height of rotating shaft 30.Second implementation The inside of 21 shaft hole of bearing body 22 of example has Oil Guide groove 23 more than a row.

In embodiment as shown in Figure 8, the interior sidewall surface of shaft hole 22 of bearing body 21 is arranged along the axial direction of shaft hole 22 Row are provided with the Oil Guide groove 23 of two rows, and an isolation channel 233 is set between two row's Oil Guide grooves 23 by two row's Oil Guide grooves 23 Keep apart.The bearing body 21 for acting as providing the embodiment of isolation channel 233 is in turning Oil Guide groove 23, foregoing car The space that cutter-edge formation is exited when molding cutter 40 reaches the middle section position of shaft hole 22 is cut, in favor of using molding cutter turning Mode is molded above-mentioned Oil Guide groove 23.

(the possibility effect of embodiment)

The effect that the present invention is reached using above-mentioned technological means is summarized as follows：

1st, in the hydrodynamic bearing assembly 20 that fan structure of the invention uses, bearing body 21 and the one of bearing fixed part 24 Shaping, while accumulator is directly shaped in the bottom of bearing body again, hence in so that bearing body 21 is without the use of axle Set, hence in so that shaft hole 22 and shaft diameter can increase, and cause rotating shaft 30 that there is larger oil film loaded area, and Its run stability is improved, and reduces beat.

2nd, because bearing body 21 is directly mounted in the fixed seat 12 of bottom plate 11, directly bearing body 21 can be arranged on In the positioning of bottom plate 11, due to saving except the position error of axle sleeve so that the positioning of bearing body 21 and shaft hole 22 can be with It is more accurate, and the situation of the center deflection of rotating shaft 30 can be avoided to produce, therefore can effectively reduce the wind caused by rotating shaft deflection Fan operating vibrations and the situation of noise.

3rd, the non-fit axle sleeve in the outside of bearing body 21 of the invention, therefore bearing body 21 is not oppressed by axle sleeve, simultaneously Bearing body 21 is designed to that bearing fixed part 24 and the fit position of fixed seat 12 be not overlapping with shaft hole 22, therefore can avoid bearing Body 21, which suffers oppression, causes the dimensional discrepancy of shaft hole 22 and the situation of out of roundness deformation to produce, it is thus ensured that shaft hole 22 is with turning Gap size between axle 30 is held in critical field, and oil film can be set up by being able to ensure that when rotating shaft 30 operates.

4th, the present invention uses is molded Oil Guide groove 23 in a manner of molding cutter turning, can accurately control each Oil Guide ditch The shape of groove 23 and path, therefore can more effectively reach the flowing of guiding lubricant grease to form the mesh of the oil film with pressure 's.

It the foregoing is only the preferred possible embodiments of the present invention, non-therefore the limitation present invention the scope of the claims, therefore such as The equivalence techniques done with description of the invention and schema content changes, and is both contained in protection scope of the present invention.

Claims (6)

1. a kind of hydrodynamic bearing, it is characterised in that the hydrodynamic bearing includes：

One bearing body, the center of the bearing body have a shaft hole for penetrating the bearing body, the shaft hole Interior sidewall surface be provided with multiple Oil Guide grooves；

One bearing fixed part, the bearing fixed part are connected to the bottom of the bearing body with being integrally formed, and the bearing is consolidated Determine composition surface of the portion with a side for being surrounded on the bearing fixed part, the composition surface engages with a fixed seat so that institute State bearing fixed part to be fixed in the fixed seat, the height on the composition surface of the bearing fixed part is less than the shaft hole Bottom so that the composition surface is not overlapping with the shaft hole with the fit position of the fixed seat；

One located at the bottom surface of the bearing fixed part accumulator, the accumulator is communicated in the bottom of the shaft hole and described The diameter of accumulator is more than the diameter of the shaft hole；

One bottom, the bottom are arranged at an opening of the accumulator, the accumulator are closed；And

One rotating shaft, the rotating shaft are penetratingly arranged in the shaft hole, and the bottom of the rotating shaft protrudes from the shaft hole Bottom and the top surface for being resisted against the bottom；

Wherein, lubricant grease is filled with the accumulator, when the rotating shaft rotates, the lubricant grease enters the rotating shaft In gap between the shaft hole, and guide the lubricant grease to flow by the Oil Guide groove and produce pressure, with The oil reservoir formed between the surface of the rotating shaft and the shaft hole；

The accumulator is surrounded on the sidewall sections of the summit portion with a summit portion and one, and the bottom is placed in The inner edge of the sidewall sections, the top surface of the bottom have a upward flange, and the apical margin of the flange is contacted with institute State the summit portion of accumulator；

There is a minim gap between the apical margin of the flange and the summit portion of the accumulator, and in the bottom One side is provided with a notch part, and the gas in the accumulator sequentially passes through the minim gap and the notch part, with stream The outside of the accumulator is led to, and the flange and the summit portion are coated with oil extracticn agent so that the flange and described The minim gap between summit portion is only for the gas by preventing the lubrication stored in the accumulator Grease passes through.

2. hydrodynamic bearing according to claim 1, it is characterised in that the Oil Guide groove is in institute using a molding cutter The interior sidewall surface for stating shaft hole carries out the groove that turning is formed, and the molding cutter has at least one forming cutter to stretch out Sword, the cutter-edge formation can contact with the madial wall of the shaft hole, and in the shaft hole madial wall formed it is described Oil Guide groove, the both ends of each Oil Guide groove have one to enter the edge of a knife and one go out the edge of a knife respectively, for the forming cutter The cutter-edge formation of tool enters into and exits from the Oil Guide groove.

3. hydrodynamic bearing according to claim 2, it is characterised in that with vertical in the shaft hole of the bearing body Direction is disposed with the Oil Guide grooves more than two rows, and an isolation channel is provided between Oil Guide groove described in each row.

4. hydrodynamic bearing according to claim 3, it is characterised in that the bottom is using made of wear resistant plastic material Wear-resisting bottom, or one wear plate is set in the top surface of the bottom.

5. a kind of fan structure using hydrodynamic bearing, it is characterised in that the fan structure includes：

One bottom plate, the bottom plate are provided with a fixed seat；

One bearing body, the center of the bearing body have a shaft hole for penetrating the bearing body, the shaft hole Interior sidewall surface be provided with multiple Oil Guide grooves；

One bearing fixed part, the bearing fixed part are connected to the bottom of the bearing body, and the bearing with being integrally formed The side of fixed part has a composition surface, and the composition surface is fixed with the fixed seat of the bottom plate to be connected so that the bearing sheet Body is fixed in the fixed seat of the bottom plate via the bearing fixed part；

One accumulator, the accumulator are arranged at the bottom surface of the bearing fixed part, and the accumulator is communicated in the shaft hole Bottom end opening and the accumulator diameter be more than the shaft hole diameter；

One bottom, the bottom are arranged at an opening of the accumulator, the accumulator are closed, the accumulator tool There is a summit portion and one be surrounded on the sidewall sections of the summit portion, the bottom is placed in the interior of the sidewall sections Edge, and a breach is provided with a side of the bottom, the top surface of the bottom has a upward flange, the flange Apical margin be contacted with the summit portion of the accumulator, and the top part of the apical margin of the flange and the accumulator / there is a minim gap, and it is coated with oil extracticn agent in the flange and the summit portion；

One rotating shaft, the rotating shaft are penetratingly arranged in the shaft hole, and the top of the rotating shaft protrudes from the bearing body Top surface, the bottom of the rotating shaft protrudes from the bottom of the bearing body and is resisted against the top surface of the bottom；

One fan blade, the fan blade are fixed on the top of the rotating shaft；

One stator, the stator are fixed on the bottom plate or the bearing body, and the stator is surrounded on the bearing sheet The outside of body；And

One rotor, the rotor is arranged at the inner side of the fan blade, and the rotor is surrounded on the outside of the stator；

Wherein, the rotor produces the magnetic field of mutual exclusion with the stator and drives the fan blade and the rotating shaft to rotate, Lubricant grease is filled with the accumulator, when the rotating shaft rotates, the lubricant grease enter the rotating shaft with it is described In gap between shaft hole, and guide the lubricant grease to flow by the Oil Guide groove and produce pressure, be situated between with being formed Oil reservoir between the surface of the rotating shaft and the shaft hole.

6. a kind of assemble method of the fan structure according to claim 5 using hydrodynamic bearing, it is characterised in that described Assemble method comprises the following steps：

One bearing number of assembling steps, by the bottom cover device in the accumulator of the bottom of the bearing body, and by described in Bearing body is installed on the step of fixed seat of the bottom plate with press-fit manner；

Stator group fills step, by the stator pack loaded on the bottom plate or the bearing body；

One rotor number of assembling steps, is assembled the rotor onto on the fan blade；

One fan assembling step, the fan blade is assembled in the top of the rotating shaft；

One oiling step, the lubricant grease is injected in the accumulator from the shaft hole of the bearing body；

One combination step, the rotating shaft for being assembled with the fan blade is inserted into the shaft hole of the bearing body It is interior, and attracted each other by magnetic force of the rotor with the stator to each other and fix the rotating shaft together with the fan blade In on the bearing body.