CN100510443C - Dynamic pressure fluid bearing - Google Patents

Abstract

A foil type dynamic pressure gas bearing capable of providing excellent bearing performance by using a spring foil easily manufacturable and having excellent productivity and a dynamic pressure gas bearing capable of eliminating a restriction in a rotating direction by using an easily installable top foil fixing structure. The spring foil (12) formed of an elastic thin flat plate having a plurality of slits (16) is fitted to the inside wall of a bearing housing (11), a top foil (13) is disposed on the inside of the spring foil, and a rotating shaft (14) is disposed on the inside of the top foil. The spring foil (12) is bent at the positions of the slits (16) to form a large number of elastic beams in contact with the inside of the inside wall, and the rotating shaft (14) is elastically supported by the elastic beams.

Description

Hydrodynamic bearing

Technical field

The present invention relates to be used for the Hydrodynamic bearing of high-speed rotating shaft, particularly utilize the pad bearing of fluid mechanics principle.

Background technique

FDB has the branch of hydrostatic profile and dynamic pressure type, and as the dynamic pressure type bearing that utilizes ambient air to produce pressure by means of the rotation of axle with provide the hydrostatic profile of pressure to compare by compressor etc. from the outside, has advantage at aspects such as cost, lightweight, maintenances, but also has fuel-efficient advantage, therefore, particularly the liner type fluid-dynamic bearing obtains in the small-sized machine of working under aircraft air condition device and air cycle machine etc. rotate at a high speed widely applying.The liner type fluid-dynamic bearing by and axle between form gas film main liner, main liner is carried out the elastic force liner of elastic support and the shell that they keep is constituted.The elastic force liner of pad bearing has all kinds such as convex and paper tinsel type.

Figure 30 is the sectional side view of an example of convex liner pneumatic bearing.As disclosed in patent documentation 1 document such as grade, use the convex liner pneumatic bearing of convex elastic force liner, running shaft be inserted in wherein shell and running shaft between be provided with by sheet metal and be the convex liner that corrugated forms, side is provided with the main liner that scribbles solid lubricant on the smooth sheet metal within it, utilize the very thin fluid film that forms between running shaft and the main liner running shaft to be supported, and main liner obtain the elastic support of convex liner on shell with fluid mechanics principle.

As convex liner pneumatic bearing, have the running shaft oneself by means of the spring function of convex liner and adjust performance, thereby require not tight to the operating accuracy of bearing, but because the convex liner need be molded into complicated shape, therefore, require the working pressure machine to carry out high-precision shaping operation, manufacturing procedure complicated and manufacturing and assembling difficulty are unsuitable for producing in batches.

The rigidity of convex liner is big, the rich degree of size is little.If reduce rigidity, Jing Guo use can not produce plastic deformation and be difficult to bring into play performance.

Figure 31 is the sectional side view of an example of paper tinsel type liner pneumatic bearing.Using the paper tinsel type pad bearing of paper tinsel type elastic force liner is that a plurality of paper tinsel type liners state overlapping with the part and that can slide mutually was arranged on the interior week of bearing shell, across the gap that can introduce air running shaft is supported in the middle of the side within it, thus under the effect of the axle load of running shaft paper tinsel type gasket deformation and press close to running shaft and form suitable air layer.

Paper tinsel type liner needs to be molded into certain shape too, thereby need carry out the shaping operation operation, and the assembling of bearing is when taking a lot of work.

In addition, patent documentation 2 discloses that a kind of elastic force liner is formed by a plate sheet and the pneumatic bearing that can omit assembling procedure.The elastic force liner of disclosed pneumatic bearing is to make the rectangular spring sheet form multi-joint support plate with suitable interval to a side perk on long axis direction, be the one end to be fixed on back on the fixed mechanism on the setting breach inside the shell be provided with, utilize elastic reaction to support thereby make support plate contact with the main liner that running shaft is fenced up along the inboard of shell.

As employed elastic force liner in the disclosed fluid mechanics bearing foil, for the perk attitude of keeping support plate needs to carry out shaping operation too.

Have, patent documentation 3 is disclosed to be again, places the elastic force liner that is wound into 3 layers in the inside of bearing shell, and its innermost layer is about quadrilateral, the mesosphere is that Heptagon, outermost surface are about hexagonal liner shaft bearing.Be wound into 3 layers elastic force liner, have the groove that crosscut forms on the width direction of the elastic force liner that sheet material is made, liner is in this groove place bending and to be sandwiched in part between poor as elastic beam.

Patent documentation 3 disclosed bearings, Qi Liangbu has elasticity, and can play the frictional attenuation effect by the contact of bending part, thereby can suppress axle journal produce self-excited vibration when high speed rotating.

But, to be to reserve certain thickness below hundreds of μ m on this smooth thin slice of elastic force liner as thin as a wafer to form poor be very difficult at thickness, and the sheet at groove place is thick becomes during very thin thereby local generation be full of cracks easily to the width direction expansion, exists problem aspect intensity.

In addition, as patent documentation 1 and patent documentation 2 also record once, for main liner, the past be with convex liner or elastic force liner with the one end by screw or be weldingly fixed on the shell inner core face, with the other end as can be free-ended what upwards move in week.When adopting this structure, thereby running shaft is sucked to the rotation of fixed end direction and with air from the free end direction form air layer between running shaft and the convex liner, if running shaft is from main liner fixed end one sideway swivel, then main liner can be wound up on the running shaft and can't form air layer, therefore, sense of rotation is only limited to a direction.

As mentioned above, existing main liner fixation method exists in order to be fixed in to be needed on the inner surface of outer cover to carry out special work, and the sense of rotation of running shaft is only limited to a problem such as direction.

Patent documentation 1: the spy opens the 2002-061645 communique

Patent documentation 2: the spy opens the 2002-364643 communique

Patent documentation 3: open flat 6-76716 communique in fact

Summary of the invention

Task of the present invention is, uses easier manufacturing and the elastic force liner that is very suitable for producing in batches provides the liner type Hydrodynamic bearing of bearing performance excellence.The 2nd task of the present invention is to adopt the main liner fixed structure of being convenient to install to provide sense of rotation unrestricted Hydrodynamic bearing.

For realizing above-mentioned task, Hydrodynamic bearing of the present invention, the elastic force liner that is formed by the smooth thin slice that is provided with a plurality of slits is installed on the inwall of bearing shell, in the inboard of elastic force liner main liner is set, in the inboard of main liner running shaft is set and constitutes, it is characterized in that, the elastic force liner form in the little position bending of rigidity have with inwall in the polygonal cross-section of a plurality of elastic beams of side contacts, by this elastic beam running shaft is carried out elastic support.

When on the elastic force liner that forms by smooth thin slice, slit being set so that it has strong and weak different flexural rigidity at different positions, and when this elastic force liner being installed on the inwall of bearing shell, can be in the little slit place bending of rigidity and and side contacts and between adjacent slit, form a plurality of elastic beams and form polygonal cross-section in the inwall.Utilize this elastic beam to carry out elastic support to main liner.

Running shaft is surrounded by main liner, and along with the carrying out of rotation, gases such as air are inhaled between running shaft and the main liner and the formation gas blanket, utilize fluid mechanics principle that the running shaft mode is supported, thereby high speed rotating is carried out sleekly.Along with the raising of rotary shaft rotating speed, the thickness of gas blanket increases and main liner is pressed against on the inwall of bearing shell the elastic force of elastic force liner is increased, and therefore, running shaft can more stably rotate under the high speed rotating state.

When slit is arranged on the elastic force liner and is inserted in the bearing shell with the parallel substantially direction of running shaft on, can make liner form joint in the bending of slit place.The power of the flexural rigidity of elastic beam is by the length decision that is sandwiched in the liner part between the slit.

By designing different slit separations, can change the length of elastic beam.A little less than its flexural rigidity of the part of elasticity beam length, but can make the distance between outer casing inner wall and the main liner big, thereby the internal diameter of bearing is little.Its flexural rigidity of part of beam weak point is big, and can make main liner close to outer casing inner wall, thereby the internal diameter of bearing is big.Therefore, the little or vibration of load hour is supported axle by the elastic force liner of the less part of internal diameter, and load is big or vibrate when big, and the part that internal diameter is big also will support axle, therefore, becomes the supporting structure with step-feeding resiliency characteristics.

Also can be arranged alternately the different slit of length.Liner is in the easy bending in the position that has long slit, and is difficult for bending comparatively speaking at the position that has short slit.Therefore, at first contact in the position bending of long slit and with the wall of shell and short slit position can bending, therefore, the internal diameter of the formed cylindrical shell of main liner is little, and the spacious amount of running shaft is little.When running shaft begins to rotate, thereby the elastic force liner makes main liner strengthen near internal diameter to casing wall at short slit place also bending, and the length of elastic beam shortens, the rigidity of elastic force liner increases.Like this, the little main liner of rigidity that can obtain having load hour elastic force liner when expansion and load increase easily rigidity increase the bearing of this extraordinary characteristic.

Also can make the equal in length of formed beam between the slit of elastic force liner and change the width of slit.The part of slit can not produce the rigidity of support of running shaft being carried out elastic support, therefore, can carry out stiffness distribution design comparatively simply and make make progress in the week of shell everywhere between form the proper supporting poor rigidity.By the week at pad bearing upwards forming poor rigidity, can make running shaft produce elliptic motion, vibration is suppressed.

As the slit that is parallel to running shaft, also isometric slit uniformly-spaced can be provided with so that the rigidity of elastic beam equates each other substantially.

As slit, also can form to central authorities from the side of liner.When slit when side is penetrating, the rigidity of liner sidepiece reduces, and can prevent that running shaft from one-sided scratch taking place.

As slit, can make leg-of-mutton two limits, rectangular three shapes that other limits except the base such as limit cut off from smooth thin slice.When with this elastic force liner when main liner is installed, the inwall of its tongue piece that extends to tangent direction at each slit place part and bearing shell is conflicted and become spring, main liner is supported.

Also slit can be made the bigger knockout shape of width, thereby and adjacent slit because of the difference of the distance of the whole thin slice end of anomaly is different rigidity is changed apart from the distance of rib.For example, when knockout shape is triangle or semicircle during outstanding shape, becomes at projection between the part of fulcrum in slit, the Effective face width of beam is little and a little less than the rigidity, but along with rotating speed improves main liner near shell and rigidity strengthens.In addition, be semicircular occasion in shape of slit, the length of initial elastic beam is long but along with main liner expansion short beam will work, therefore, present along with rotating speed improves the characteristic that rigidity sharply strengthens.

As mentioned above, by shape of slit being selected to obtain desirable rigidity characteristics.

In addition, also a part of slit can be parallel to the side setting of the smooth thin slice of elastic force liner.By on the running shaft direction, being divided into several zones, can obtain with the running shaft direction on be distributed with the identical effect of the different spring of rigidity.

Also, can form the elastic force liner, applying solid oiling agent on the remaining the other end after being enough to running shaft fenced up and using as main liner since an end of a plate sheet.This is because main liner normally is positioned at the inboard of elastic force liner.

Also the slit portion of elastic force liner can be designed to a plurality of slit high density arranges.Though slit portion bending and contacting with outer casing inner wall as long as a plurality of slit high density are arranged, just can be shared pushing force by carrying in many ribs of inwall, thereby can reduce interface pressure.

The slit of side of the smooth thin slice of parallel sub elastic force liner also can be set in the central authorities as the part of the beam between slit and the slit in addition.The middle body of beam contacts with main liner and can make main liner have rigidity, and the slit that is arranged on the central authorities of beam then has the area of contact that increases elastic force liner and main liner and the effect that reduces interface pressure.

The elastic force liner also can be wound into multilayer around main liner.Particularly, with slit state overlapping be advisable corresponding of the elastic force liner of inboard with the middle position of the beam of the elastic force liner in the outside.

When making multi-layer structure, rigidity can improve along with the expansion of main liner, therefore, all can support with the rigidity of appropriateness from the low speed rotation to the high speed rotating.

If to have the state setting of lap mutually, then can utilize friction between the liner to obtain alleviating the effect of bear vibration a plurality of elastic force liners.

Preferably, the slit of elastic force liner has circular arc to relax the stress that the end produces in its end.

Slit can be made by etching.When adopting etching, can equally accurately and easily form the very meticulous slit of size with the making printed wiring board.

Also can make the inner hole section of bearing shell be polygonal and form, and the slit that is mounted to the elastic force liner is positioned at place, polygonal summit.When having this summit, can make the fixed operation of elastic force liner become light.In addition, if make the centre of the beam of drift angle between the slit that is formed at the elastic force liner of the polygonal cross-section of bearing shell endoporus, then the section area in the space that is formed by the wall and the elastic force liner of shell is big and can make a large amount of cooling fluid circulations, can make the speed range expansion that bearing institute can proper functioning.

In addition, preferably, form the stop wall of holding up respectively, will between two stop wall, make it two ends by the main liner intercalation that the smooth thin slice of elasticity forms and withstand and fix from inner wall surface at two places of the outer casing inner wall that two ends contacted of main liner.And, the angle on stop wall surface preferably with respect to inner wall surface in 60 ° to 90 ° scope.

In addition, preferably, form the recess of cross section shape triangular in shape in the front of stop wall, the curve that main liner is nature blocks.

When adopting this card locking mechanism, want to make main liner to come off, must satisfy that main liner moves or dislocation takes place the axial location of the cylindrical shell of main liner and the girth that causes holding the limit to cross stop wall or main liner shortens to conditions such as the length of the circumference that couples together than the front position with stop wall is short on the width direction of shell from shell.But, as long as stop to live main liner moving on width direction, the variation of above-mentioned condition can take place to satisfy hardly, therefore, with past a end of main liner is compared by screw or the method that is weldingly fixed on the outer casing inner wall, this card locking mechanism is the good method that structure and using method very simply but can be fixed reliably.

In addition, the decomposition of the dismounting of main liner and device also can become easy.

For main liner moving on width direction, even adopt common mounting type also can outer shell and the friction of main liner suppressed simply, but, block also can be set in the side of stop wall or in the end of main liner ear be set and be fixed on the side of shell in order to be stoped more reliably.

When adopting this method, the two ends of main liner all are fixed on the shell, all air can be introduced between main liner and the running shaft from any fixing part office, and therefore, no matter which direction rotation of axial rotary all can be brought into play the performance of FDB.

In addition, in order to impel air to enter to improve cooling capacity from the space of standing part, preferably strengthen the triangular shaped recess that forms previously in vertical stop wall, in addition, can also making bearing sense of rotation inlet (forward position) the side person's ratio that is positioned among the recess, to be positioned at outlet (edge, back) side person dark, air introduced helping.

By main liner upwards is divided into multistage with the elastic force liner in week, can regulate come-up performance and load capacity.Particularly, main liner is set, can obtains the high bearing dynamic characteristic of stability of vibration with unequal spacing.

When adopting this card locking mechanism, also elastic force liner or convex liner can be fixed with main liner.。

In order to realize above-mentioned task, the present invention also provides the employed elastic force liner that is made of the smooth thin slice that is provided with a plurality of slits in a kind of liner type Hydrodynamic bearing in addition.

In addition, provide a kind of two ends at main liner be formed with on the position of the outer casing inner wall of contact with it with respect to inner wall surface and have the stop wall of about 60 ° to 90 ° angle and be formed with the recess of cross section shape triangular in shape in the front of this stop wall and the card locking mechanism that constitutes, and be that main liner is being stretched intercalation between the surface of stop wall and the main liner card locking mechanism that makes it to fix, can use in the Hydrodynamic bearing that uses various liners.

According to fluid mechanics pad bearing of the present invention, not only can be than the past simpler and make the elastic force liner more accurately and be assembled into bearing simply thereby be very suitable for producing in enormous quantities, and the performance of bearing also can adjust as required in the larger context, and the stability during high speed rotating also is improved.In addition, pad bearing of the present invention allows any direction rotation of axial rotary.

Description of drawings

Fig. 1 is the sectional view of the related hydrodynamic gas-lubricated bearing of the present invention the 1st embodiment.

Fig. 2 is the slit layout chart of employed elastic force liner in the 1st embodiment's the hydrodynamic gas-lubricated bearing.

Fig. 3 is the accompanying drawing that the end portion treatment with regard to the slit of elastic force liner describes.

Fig. 4 is the plan view that the slit situation of the elastic force liner of the feature that constitutes the present invention the 2nd embodiment is showed in a schematic way.

Fig. 5 is the sectional view of the related hydrodynamic gas-lubricated bearing of the 2nd embodiment.

Fig. 6 is the plan view that the slit situation of the elastic force liner of the feature that constitutes the present invention the 3rd embodiment is showed in a schematic way.

Fig. 7 is the plan view of employed elastic force liner in the present invention the 4th embodiment's the hydrodynamic gas-lubricated bearing.

Fig. 8 is the accompanying drawing that the assembled condition of employed elastic force liner describes in the hydrodynamic gas-lubricated bearing to the 4th embodiment.

Fig. 9 is the plan view of employed elastic force liner in the present invention the 5th embodiment's the hydrodynamic gas-lubricated bearing.

Figure 10 is the accompanying drawing that the assembled condition of employed elastic force liner describes in the hydrodynamic gas-lubricated bearing to the 5th embodiment.

Figure 11 is the plan view of employed elastic force liner in the present invention the 6th embodiment's the hydrodynamic gas-lubricated bearing.

Figure 12 is the accompanying drawing that the assembled condition of employed elastic force liner describes in the hydrodynamic gas-lubricated bearing to the 6th embodiment.

Figure 13 is the plan view of employed elastic force liner in the present invention the 7th embodiment's the hydrodynamic gas-lubricated bearing.

Figure 14 is the plan view of employed elastic force liner in the present invention the 8th embodiment's the hydrodynamic gas-lubricated bearing.

Figure 15 is the sectional view of the related hydrodynamic gas-lubricated bearing of the present invention the 9th embodiment.

Figure 16 is the plan view of employed elastic force liner in the 9th embodiment's the hydrodynamic gas-lubricated bearing.

Figure 17 is the stereogram that the card locking mechanism to the elastic force liner describes.

Figure 18 is the stereogram that the example that adds anti-shedding mechanism in the card locking mechanism of elastic force liner is described.

Figure 19 is the stereogram that the example that adds other anti-shedding mechanism in the card locking mechanism of elastic force liner is described.

Figure 20 is that the card locking mechanism to the 9th embodiment is applied to the sectional view that the situation in the convex liner pneumatic bearing device is showed.

Figure 21 is the sectional view that the situation of using a plurality of card locking mechanisms in the 9th embodiment's the hydrodynamic gas-lubricated bearing is described.

Figure 22 is the sectional view of the related hydrodynamic gas-lubricated bearing of the present invention the 10th embodiment.

Figure 23 is the plan view of employed elastic force liner in the present invention the 10th embodiment's the hydrodynamic gas-lubricated bearing.

Figure 24 is the accompanying drawing that the example of the another kind of shape of formed tongue piece on the elastic force liner is showed.

Figure 25 is the accompanying drawing that the example of another shape of formed tongue piece on the elastic force liner is showed.

Figure 26 is the plan view of employed elastic force liner in the present invention the 11st embodiment's the hydrodynamic gas-lubricated bearing.

Figure 27 is the sectional view of the related hydrodynamic gas-lubricated bearing of the present invention the 12nd embodiment.

Figure 28 is the sectional view of the related hydrodynamic gas-lubricated bearing of the present invention the 13rd embodiment.

Figure 29 is the sectional view of the related hydrodynamic gas-lubricated bearing of the present invention the 14th embodiment.

Figure 30 is a sectional view of showing the example of prior art hydrodynamic gas-lubricated bearing.

Figure 31 is a sectional view of showing another example of prior art hydrodynamic gas-lubricated bearing.

Embodiment

Below, the preferred implementation of hydrodynamic gas-lubricated bearing of the present invention is elaborated.

Embodiment 1

Fig. 1 is the sectional view of the related hydrodynamic gas-lubricated bearing of the present invention the 1st embodiment, and Fig. 2 is the slit layout chart of wherein employed elastic force liner.

In the hydrodynamic gas-lubricated bearing 1 of present embodiment, the contacted elastic force liner 12 of inwall with the shell 11 of tubular is housed, the side main liner 13 that is equipped with that an end is fixed on the outer casing inner wall and installs around a week approximately along outer casing inner wall within it, running shaft 14 is placed in the tubular that is formed by main liner 13 across air layer 15.

Elastic force liner 12 is that the thin resilient blade of hundreds of μ m constitutes by thickness, and as shown in Figure 2, the coiling direction of liner is provided with the identical slit 16 of shape that is arranged in parallel.Slit 16 place parts because of the few rigidity of metalwork a little less than, therefore, elastic force liner 12 is in being installed in hydrodynamic gas-lubricated bearing 1 time, will become the tubular with local open polygonal cross-section as shown in Figure 1 in the bending of slit place.

In general, the cross section is the rib that the elastic force liner 12 of polygonal tubular forms in slit 16 places bending and contacts with outer casing inner wall, and the part between the slit 16 is carried out elastic support as elastic beam to the main liner 13 of inside.

If the interval of the slit of elastic force liner 12 is longer, the rigidity that then is formed at the long elastic beam A between the slit is little, and it is bigger than the rigidity of the elastic beam B of the weak point of weakness to be present in the interval.So, the rigidity of elastic force liner 12 can be adjusted by the position of slit, therefore, can make to have desired elasticity on the desirable position that makes progress in bearing week.

Main liner 13 is to have carried out fixedly oiling agent to handle on thickness is the smooth resilient blade of hundreds of μ m, thereby and running shaft 14 between the little liner of friction factor, an end is fixed on the inwall of shell 11, the other end is a free end.

Shown in the arrow of Fig. 1, running shaft 14 is to the free end direction rotation of main liner 13.The formation air layer 15 in case rotation beginning, air just are inhaled between running shaft 14 and the main liner 13.Thereby air layer 15 can significantly reduce spin friction is carried out rotation sleekly.

But for the hydrodynamic gas-lubricated bearing of present embodiment, if running shaft 14 is to the rotation of opposite fixed end direction, then main liner 15 will be wound on the surface of running shaft 14 and can't suck air, make the formation failure of air layer.

When running shaft 14 high speed rotating, air layer 15 become more substantial and with main liner 13 when inwall one side of shell 11 pushes, beam A will deform, its elasticity number increases gradually, if and then main liner 13 contacts with elastic beam B, the beam B that then has big rigidity works, and can support running shaft 14 with bigger rigidity.

Therefore, according to the formation of present embodiment, when beginning rotation supports with more weak rigidity, then supports with the stronger rigidity that can overcome bigger active force during high speed rotating, can obtain having the bearing means with the corresponding step-feeding rigidity of rotational speed.

In addition, select, suitable selection is carried out at the quantity and the interval of slit, can adjust the size and the distribution of rigidity on shell is circumferential of rigidity of support easily by thickness and material to smooth elastic sheet metal.

Preferably, shown in the schematic representation of Fig. 3, make the end of slit 16 have circular arc R to relax stress.

The hydrodynamic gas-lubricated bearing of present embodiment is compared with paper tinsel type gas bearing with existing insert type gas bearing, only needs offer slit on the elastic force liner and needn't the working pressure machine etc. carries out shaping operation, and it is easy that its manufacturing and assembling become.In addition, the processing of elastic force liner can be adopted the etching technique that is adopted in the printed wiring board manufacturing, if adopt etching technique, can also improve precision, be convenient to produce in enormous quantities.

Embodiment 2

Fig. 4 and Fig. 5 are the accompanying drawings that other embodiments of the invention are described, and Fig. 4 is the plan view that the slit situation of the elastic force liner of the feature that constitutes present embodiment is showed in a schematic way.And Fig. 5 is the sectional view of the hydrodynamic gas-lubricated bearing of present embodiment, (a) is the rotation original state, and (6) are the interim states in the rotating speed raising process, the state when (c) being high speed rotating.

On the employed in the present embodiment elastic force liner 21, have the different slit of length to be alternately distributed, have the part of long slit 22 since the width of the smooth tinsel that kept is little thus rigidity a little less than, the easy bending of liner.The part that has short slit 23 then is difficult for bending by comparison.

Therefore, when stopping the rotation, shown in Fig. 5 (a), long slit 22 place part bendings and contacting with the inwall 24 of shell, short slit 23 place parts are difficult for bending, thereby the internal diameter of main liner 25 formed cylindrical shells is little, and the spacious amount that obtains the running shaft 26 that main liner 25 supports is little.

When running shaft 26 begins rotation and load when big, shown in Fig. 5 (b), between running shaft 26 and main liner 25, produce air layer 27, thereby main liner 25 is close to outer casing inner wall 24, even if at short slit 23 places, also bending and cause the length of elastic beam to shorten of elastic force liner 21, the rigidity of elastic force liner 21 increases.

And then when running shaft rotated with common speed, shown in Fig. 5 (c), air layer 27 was enriched, and main liner 25 fully expands into outer casing inner wall 24 and roughly becomes concentrically ringed shape, supports with the short elastic beam with big rigidity.

By the hydrodynamic gas-lubricated bearing of the alternatively distributed elastic force liner of the slit of having assembled different length as mentioned above, can obtain having load the little main liner of rigidity of hour elastic force liner when expansion and load increase easily rigidity increase a kind of like this bearing of desirable characteristic.

Embodiment 3

Fig. 6 is the plan view of the elastic force liner that keeps from side cutting slit and with middle body.

As shown in Figure 6, the hydrodynamic gas-lubricated bearing of present embodiment is the bearing that is assembled with elastic force liner 31, be formed with on this elastic force liner 31 from the incision of the side of liner and liner central authorities reserve certain width in the middle of a plurality of slits 32 of band.Like this because the elastic force liner can move relative to each other at the open-ended thereby elastic beam of bearing, therefore, the rigidity of sidepiece than inner rigidity a little less than, can prevent from when the running shaft banking motion that running shaft is one-sided to scratch.

Embodiment 4

Fig. 7 is the plan view of employed elastic force liner in the 4th embodiment's the hydrodynamic gas-lubricated bearing, and Fig. 8 is the accompanying drawing that the assembled condition to the elastic force liner of Fig. 7 describes.

As shown in Figure 7, employed elastic force liner is to form elastic force liner 34 parts in the lump and main liner 35 parts form on the smooth thin slice 33 that is made of a slice elastic material in the present embodiment.Suitable position in elastic force liner 34 parts is formed with slit, scribbles solid lubricant on the surface of main liner 35 parts.Among the figure, be formed with 4 slits on the elastic force liner 34, thereby the elastic force liner part will form quadrilateral in the bearing of packing into the time.But unquestionable, also more slit can be set.

The hydrodynamic gas-lubricated bearing 3 of present embodiment shown in Figure 8, be that the part that scribbles solid lubricant 35 with the smooth thin slice 33 of elasticity is rolled into circle and as main liner, make the part 34 that is formed with slit in the bending of slit place and as the elastic force liner, form in the inwall 36 with their insertion shells again.

Also can be shown in the dotted line among the figure, the end 37 of elastic force liner is extended on the outer casing inner wall 36 fix, misplace because of the running shaft rotation to prevent liner.

The hydrodynamic gas-lubricated bearing of present embodiment is an one because of elastic force liner and main liner, thereby can reduce the amount of parts that constitutes bearing, realizes the rationalization of making.

Embodiment 5

Fig. 9 is the plan view of employed elastic force liner in the 5th embodiment's the hydrodynamic gas-lubricated bearing, and Figure 10 is the accompanying drawing that the assembled condition to the elastic force liner of Fig. 9 describes.

As shown in Figure 9, employed elastic force liner 41 is to parallel and be adjacent to be provided with a plurality of slits 43 in the centre on the slit portion 42 that elastic beam forms to form in the present embodiment.

In the time of in elastic force liner 41 is installed in outer casing inner wall 44, thereby in slit portion 42 places bending a plurality of slits 43 being contacted with outer casing inner wall 44 as shown in figure 10 supports load, therefore, have the pressure that reduces surface of contact and alleviate the effect of the wearing and tearing of outer casing inner wall 44.

When part extreme wear outer casing inner wall 44 and that elastic force liner 41 contacts, the elasticity number of elastic beam 45 will reduce and might can't bring into play the performance of wishing its performance, if can prevent the generation of this situation, then have and to reduce the effect of adjusting man-hour again.

Embodiment 6

Figure 11 is the plan view of employed elastic force liner in the 6th embodiment's the hydrodynamic gas-lubricated bearing, and Figure 12 is the accompanying drawing that the assembled condition to the elastic force liner of Figure 11 describes.

As shown in figure 11, employed elastic force liner 47 is that formed vertical slit 48 is clipped in the middle and on the part as elastic beam, is formed with a plurality of horizontal slit 49 parallel with the side of elastic force liner 47 and forms on by the width direction of elastic force liner 47 in the present embodiment.

In the time of in elastic force liner 47 is packed outer casing inner wall 46 into, contact with outer casing inner wall 46 and bending at vertical slit 48 places, thereby become the elastic force liner that the cross section is polygonal tubular, and at a plurality of horizontal slit 49 place's reduced stiffness, therefore, will be as shown in figure 12, the surface realization face contact along main liner 50 is reduced contact pressure thereby elastic force liner 47 is at a plurality of horizontal slits 49 places.

Embodiment 7

Figure 13 is the plan view of employed elastic force liner in the 7th embodiment's the hydrodynamic gas-lubricated bearing.

Employed elastic force liner 51 is that the identical slit of length 52,53,54 forms with appropriate intervals formation in the present embodiment, just can adjust the rigidity of beam by the length that is formed at the elastic beam between the adjacent slots is selected, and can adjust the distribution of elastic beam by the width of selection slit.

Elastic beam is to form between the edge of slit, thereby there is not the elasticity of running shaft being carried out elastic support on the part of the bigger slit 53,54 of width, therefore, by the width of suitable selection slit, can adjust the elasticity distribution of elastic force liner 51.By the week at bearing upwards producing poor rigidity, can make the vibration stabilization performance that the vibration of following high speed rotating to produce is suppressed be improved.

Embodiment 8

Figure 14 is the plan view of employed elastic force liner in the 8th embodiment's the hydrodynamic gas-lubricated bearing.

The elastic force liner 56 that uses in the present embodiment is a kind of like this liners, promptly, the vertical slit 57 that is formed on the width direction of elastic force liner 56 is clipped in the middle and becomes on the part of elastic beam, be formed with a plurality of horizontal slit 58 parallel and elastic beam is divided into proper width, in the time of in the shell of packing into rigidity of support is upwards changed in the week of running shaft with the side of elastic force liner 56.For example, when the horizontal slit 58 parallel with side makes that approaching side edge to form high and rigidity place, two ends of the rigidity of bearing centre is low, can prevent that running shaft from one-sided scratching being taken place.

Embodiment 9

Figure 15 is the schematic cross sectional views of the 9th embodiment's hydrodynamic gas-lubricated bearing, and Figure 16 is the plan view of employed elastic force liner in the present embodiment, and Figure 17 is the stereogram that the card locking mechanism to the elastic force liner describes.

6 of the hydrodynamic gas-lubricated bearings of present embodiment are assembled with the gas bearing of the elastic force liner 62 that the identical slit of shape uniformly-spaced arranges.

The inboard of bearing shell 61 embed respectively with shell in Zhou Changdu elastic force liner 62 and main liner 63 about equally, with running shaft 64 insert by main liner 63 forms tin in.

When elastic force liner 62 being rolled into when diameter is put into the tube of shell less than the cylindrical shape of shell 61 after it being discharged, will under the effect of the elastic force of liner, expanding and closely contact with inwall.At this moment, be polygonal tubular, between adjacent rib, form elastic beam thereby contact the formation cross section with inwall because slit 67 places that form on the elastic force liner 62 become rib.

Main liner 63 too, when it being rolled into interior rear flank that diameter inserts elastic force liner 62 less than the cylindrical shape of shell 61 it is discharged, will be under the effect of self elastic force expansion and pushing from the inboard to elastic force liner 62.The length of main liner 63 can make its in shell 61 inside substantially around the end of a week back to Dacca locking mechanism 66.Two ends of main liner 63 are fixed on the inwall of shell 61 by card locking mechanism 66 shown in Figure 17.

Elastic force liner 62 is that the thin resilient blade of hundreds of μ m forms by thickness.As shown in figure 16, elastic force liner 62 rectangular in shape form, and have long side direction and short side direction.The short side direction of elastic force liner 62 is the shell 61 interior backs directions parallel substantially with the axis of running shaft of packing into.The identical a plurality of slits 67 of shape are spaced in that the long side direction of elastic force liner 62 is first-class, the length (slit length) of slit 67 on the length direction that has slit on the short side direction of elastic force liner 62, and on the long side direction of elastic force liner 62, have the groove width (slit width) of slit.

When elastic force liner 62 occurs bending and deformation, the bending deflection that its bending deflection is assigned to the bending deflection born by slit 67 and is born by the elastic beam that is formed between slit 67 and the adjacent with it slit 67.

The slit length of slit 67 is long more with respect to the length on the short side direction of elastic force liner 62, the easy more bending that is in the shape of the letter V at slit 67 places of elastic force liner 62, elastic beam is seen over linearly shape and elastic beam itself is plane shape from analysing and observe angle, and the bending deflection major part of elastic force liner 62 is born by slit 67.And the slit length of slit 67 is short more with respect to the length on elastic force liner 62 short side directions, easy more its plane shape of change of elastic beam, elastic beam is seen and is circular arc and elastic beam itself is the barrel surface shape from analysing and observe angle over, and the bending deflection of elastic force liner 62 is strong more by slit 67 and the two tendency of bearing of elastic beam.

On the other hand, the size in the gap between the outer wall of the inwall of main liner 63 and Cylindorical rod 14 is the key factor of the performance of decision liner type Hydrodynamic bearing.Therefore, in the manufacturing of liner type Hydrodynamic bearing, it is important that the precision in this gap is controlled at more than the predetermined extent.For elastic force liner 62 and main liner 63, exist unavoidable thick error of employed sheet material etc., therefore, requirement in the manufacture process of fully predicting the liner type Hydrodynamic bearing on the basis of unavoidable foozle, the precision in above-mentioned gap is controlled at more than the predetermined value.Thus, can make the liner type Hydrodynamic bearing in permissible range, reach the desired function of design.

We know, this arrives the desired function of design in permissible range will to make the liner type Hydrodynamic bearing under the situation that must carry out strict control as mentioned above to above-mentioned gap precision, preferably, the diastrophic major part of elastic force liner 62 is born by slit 67, and the bending so that elastic force liner 62 is in the shape of the letter V at slit 67 places, elastic beam are seen over linearly shape and elastic beam itself is plane shape from analysing and observe angle.According to diastrophic analysis of elastic force liner and bearing performance experiment are learnt, the occasion of bearing by slit 67 and elastic beam in the bending deflection of elastic force liner 62, preferably, the diastrophic ratio that elastic beam is born among the bending deflection of elastic force liner 62 (bend ratio that is called elastic beam) is below 15%.When the bend ratio of elastic beam greater than 15% the time, the diastrophic variation of caused elastic beams such as the thick error of sheet strengthens, and the size in the gap between the inwall of the main liner 63 of the diastrophic elastic beam inscribe of elastic force liner 62 and the outer wall of Cylindorical rod 14 changes, and the liner type Hydrodynamic bearing can't reach the desired function of design.

For this reason, be conceived to the length ratio ((slit length of slit 67)/(length on the short side direction of elastic force liner 62)) (below be called slit length than) on the short side direction of the slit length of slit 67 and elastic force liner 62, to slit length than and the bend ratio of above-mentioned elastic beam between relation analyze.Obtained such result by analysis, promptly, slit length is 29% than the bend ratio that is 0% o'clock elastic beam, slit length is 27% than the bend ratio that is 60% o'clock elastic beam, slit length is 21% than the bend ratio that is 70% o'clock elastic beam, slit length is 18% than the bend ratio that is 80% o'clock elastic beam, slit length is 14% than the bend ratio that is 85% o'clock elastic beam, slit length is 8% than the bend ratio that is 90% o'clock elastic beam, and slit length is below 1% than the bend ratio that is 95% o'clock elastic beam.Also learn in addition, when slit length when surpassing 90%, slit 67 is long and can't guarantee the intensity of elastic force liner 62.In addition, can make such judgement according to bearing performance experiment, that is, slit length is being than being advisable 80% or more, below 90%, if slit length compare more than 80%, 85% with next better.When slit length than less than 80% the time, elastic beam is seen and is circular arc and elastic beam itself is the barrel surface shape from analysing and observe angle over, therefore, the big young pathbreaker in the gap between the outer wall of the inwall of main liner 63 and Cylindorical rod 14 exceeds the predetermined model figure that allows.In addition, when slit length than greater than 90% the time, the intensity of elastic force liner 62 can't be guaranteed, and when the slit length ratio be 85% when following, can guarantee the intensity of elastic force liner 62 conscientiously.

In addition, the groove width of slit 67 (slit width) is preferably at more than 1.0 times of thickness of the smooth elastic sheet metal that forms elastic force liner 62, perhaps, is not less than 1.0 times of thickness of smooth elastic sheet metal.As for the CLV ceiling limit value of the groove width of slit 67,, set according to the requirement that the bend ratio that makes elastic beam reaches below 15% from the considerations such as gap size between the slit 67.If the groove width of slit 67 is less than 1.0 times of the thickness of smooth elastic sheet metal, then when 62 bending deflections of elastic force liner, elastic force liner 62 bending that is not easy to be in the shape of the letter V at slit 67 places, therefore, elastic beam is seen and is not easy to become rectilinear form from analysing and observe angle over, and the bend ratio of elastic beam will be greater than 15%.

Card locking mechanism 66 is the back-to-back a pair of vee gutters 69 that form on the inwall of shell 61.Be formed with and be clipped in the middle by a pair of vee gutter 69 and be retained the projection 70 of getting off, the both sides of projection 70 be the vertical stop wall 68 of cardinal principle.

The end of main liner 63 falls into vee gutter 69, and the elastic force of desiring to flick by liner self overlays on the inwall of shell 61, thereby is not easy to come off.In order to prevent that more reliably it from coming off, preferably, main liner 63 is fixed with the state that two end limits withstand on the stop wall 68.

Consider from the convenience of the manufacturing process of the inwall that forms shell 61 by cutout, design the end face of projection 70 contour, but consider, it is projected on the position identical with the internal surface of main liner 63 from function aspects with the internal surface of shell 61.The high more main liner 63 of height of projection 70 is difficult drop-off more.

When adopting this card locking mechanism 66, only however take place that main liner 63 moves on the width direction of shell 61, girth that the dislocation of the axial location of the cylindrical shell of main liner 63 or diameter reduce to cause its end limit to cross projection 70, main liner 63 extremely shortens to than situations such as the circumferential length from stop wall 68 to an opposite side stop wall 68 are short, main liner just can not come off from shell.Usually, main liner 63 is pressed against by elastic force liner 62 on the inwall of shell 61, therefore, and because of frictional force is difficult to greatly move on width direction.In addition, when main liner 63 shrinks and the diameter of cylindrical shell when diminishing, the end limit will stick in the stop wall 68, produce the power that works to the direction that is difficult to come off.

Preferably, extend along this bottom surface to the end that tangent direction is extended on main liner 63 formed tubulars as the face formation tangent with the circle of inwall on the cross section of shell 61 bottom surface that makes vee gutter 69, withstands on the stop wall 68 up to the end limit and stop.If from complanation, smooth-going ground of cylindrical form shape, then can prevent the position protuberance that its shape changes in the time of can making main liner 63 in entering vee gutter 69.If produce bump, then can cause main liner 63 to contact with running shaft 64 and rotate be obstructed, problems such as frictional heating, increase wearing and tearing, this is undesirable.

When running shaft 64 rotation, air can be inhaled into from formed gap on card locking mechanism 66 parts between main liner 63 and the running shaft 64 and formation air layer 65.The two ends of main liner 63 by and the inwall of shell 61 between friction and suffer restraints because of rather than free end, and between main liner 63 and running shaft 64, has the opening that to introduce air, therefore, different with the 1st embodiment's bearing, no matter to the left and right which side of running shaft 64 all can produce air layer 65 to rotation.

Along with the rotation of running shaft 64, air layer 65 further enriches and main liner 63 is pressed against on the inwall of shell 61, and therefore, during high speed rotating, the elastic beam of elastic force liner 62 deforms and with very strong rigidity running shaft 64 supported.

In addition, preferably, make the degree of depth of vee gutter 69 suitable, make with the supply that promotes air air layer 65 generation and enrich and become more slick and sly.

If the sense of rotation of bearing determines, the vee gutter 69 that also can be designed to be positioned at sense of rotation inlet (forward position) side is darker than being positioned at outlet (edge, back) side, make air be introduced into easily main lining and spool between.

With an end of main liner is compared by screw or the existing method that is weldingly fixed on the outer casing inner wall, card locking mechanism 66 has very simple structure, needn't carry out special processing in order only to block on main liner 63, but also can save assembling man-hour.In addition, it is simple that the disassembling of bearing means becomes, the transformation of being convenient to maintain and need carrying out because of condition changing.

For elastic force liner 62, can support fully by the covering and the pushing of main liner 63, if but use card locking mechanism 66 and support with the same mode of main liner 63, support in the face of main liner 63 from it again, then when the assembling bearing means, elastic force liner 62 can be fixed the main liners 63 of packing into afterwards, thus very convenient.

Figure 18 and Figure 19 are the stereograms that the state that has increased the mechanism that is intended to prevent that conscientiously main liner 63 from coming off is showed.Two kinds of schemes can prevent that all main liner 63 from moving axially and come off on the inwall of shell 61.

Scheme shown in Figure 180, be with backstop 71 by screw on the side of projection 70 of card locking mechanism, to mobile restrict of main liner 63 on width direction.The upper limb of backstop 71 is lower than the upper surface of projection 70, to avoid hindering the motion of running shaft.

Scheme shown in Figure 19 is the intermediate plate 72 that is provided with in the end of main liner 63 on the end face that can be clipped in shell 61.Even main liner 63 is desired in the axial direction to move under the effect of certain power, intermediate plate 72 also can stop and makes it and can't move its ora terminalis.

Two kinds of schemes all can prevent that conscientiously main liner 63 from coming off by additional simple mechanism.

Figure 20 is the sectional view that the card locking mechanism 66 to present embodiment is applied to use the situation in the hydrodynamic gas-lubricated bearing 7 of convex liner 73 to show.

The middle locking mechanism 66 of present embodiment is not limited to use the occasion of elastic force liner of the present invention, and is unquestionable, as long as the end is lamella shape as shown in figure 17, can be applied to equally use in the bearing means of convex liner or use paper tinsel type liner.

In addition, card locking mechanism 66 is not to be provided with one in shell 61, a plurality of card locking mechanisms also can equally spaced be set so that rigidity of support is adjusted, perhaps as shown in figure 21, the card locking mechanism is set so that produce the rigidity of support of non-equalization with appropriate intervals, thereby for example vibration is suppressed or tackles the variation of starting load and rotary load.

Embodiment 10

Figure 22 is the schematic cross sectional views of the 10th embodiment's hydrodynamic gas-lubricated bearing, and Figure 23 is the plan view of employed elastic force liner in the present embodiment.

The hydrodynamic gas-lubricated bearing 8 of present embodiment is to use the bearing of elastic force liner 82 shown in Figure 23.As elastic force liner 82, its whole face is provided with by form the tongue piece 86 that slit forms on rectangular 3 limits, and in the drawings, to be the identical tongue piece of shape 86 be one group with 3 arranges on width direction and arrange 15 groups in the longitudinal direction, but unquestionable, be not limited to such setting.

With the inboard that this elastic force liner 82 inserts bearing shell 81, the main liner 83 that will become tubular by card locking mechanism 84 is fixed on the inwall, inserts running shaft 85 and formation bearing 8 again among them.

Because elastic force liner 82 is provided with along main liner 83, therefore, tongue piece 86 extends and contact with the inside of shell 81 and work as spring to tangent direction from the curved surface on the surface of elastic force liner 82, and by 83 pairs of running shafts of main liner, 85 generation rigidity of support.Tongue piece 86 not merely plays the effect of spring, has the ability that vibration is suppressed by the frictional attenuation effect in the time of also can be in slip on the inner wall surface of shell 81 thereby at high speed rotating when being subjected to pushing.

Tongue piece 86 carries out cutting simply and forms on elastic force liner 82, Gu these are different with paper tinsel type liner, needn't make it plastic deformation.Cutting can be with embodiments such as embodiment 1 in the slit of employed elastic force liner simply and accurately carry out by etching equally.

Figure 24 and Figure 25 are the accompanying drawings that the example of the variation of the shape of formed tongue piece on the elastic force liner 82 is showed.

The elastic force liner 82 of Figure 24 is examples that rectangular tongue piece width in the axial direction changes.Middle tongue piece 87 forms with the width of broad, and the width of the tongue piece 88 at two ends is littler than middle tongue piece 87.When this elastic force liner 82 is installed, can obtain stronger rigidity of support at the axial centre position of bearing and obtain more weak rigidity of support in the end, prevent that running shaft from one-sided scratching being taken place.

The elastic force liner 82 of Figure 25 is cutting slits and form the liner of triangle tongue piece on leg-of-mutton two limits, and middle tongue piece 89 is triangles bigger than the tongue piece 90 at two ends.

As leg-of- mutton tongue piece 89,90, along with the distance of liner 82 and shell 81 shortens, the direction that effective Support Position of its tongue piece will broaden gradually to the width of the butt of tongue piece changes, and therefore, has the characteristic of the rapid more increase of the high more rigidity of support of rotational speed.At nearer position, the end of distance between bearing, short so can be pressed on the shell 81 because of tongue piece 90 by very big trying hard to recommend, thereby a little less than the rigidity of support, have and prevent the one-sided function that scratches.

Embodiment 11

Figure 26 is the plan view of employed elastic force liner in the 11st embodiment's the hydrodynamic gas-lubricated bearing.

The elastic force liner that uses in the present embodiment is slit portion to be made the knockout shape with width form, thereby and adjacent slit because of the difference of the distance of the end of the smooth thin slice of distance liner is different rigidity is changed apart from the distance of rib.

For example, shown in Figure 26 (a), use is arranged with knockout shape for when one side of slit protrudes the elastic force liner 91 of slits 92 shape, wider width such as triangle or circle, the projection of slit central authorities will not contact with the inwall of shell and become a fulcrum when main liner is expanded as yet, thereby become at central position and form long beam and there is not the state of effective beam in sidepiece, running shaft is subjected to the support of more weak rigidity at central position.Like this, can make rigidity bearing axially on big variation is arranged.

And, when running shaft rotation, the expansion of main liner, projection in the slit is to contact with outer casing inner wall thereby the rigidity of support increase with the shape that is extended to butt gradually, when high speed rotating, elastic beam is urged the most at last on wall and presents very powerful rigidity, and rigidity can change a lot along with rotation.

In addition, if slit is the slit 93 of the wider width of shapes such as semicircle, arc or stepped shaft shown in Figure 26 (b), then when main liner does not open as yet, the outer two ends of the slit of wider width contact with the inwall of shell and become fulcrum and thereby the beam that forms longspan obtains more weak rigidity, but since inoperative at the central position elastic beam, therefore exist stiffness distribution in the axial direction.Then, along with main liner is opened, the slit centre contacts little span with outer casing inner wall beam works thereby rigidity becomes big, and rigidity can change a lot along with rotation.The distribution of this rigidity and changing condition are different because of shape of slit.

Therefore, can select the slit 94 of wider width of the suitable shape shown in Figure 26 (c) so that rigidity of support is designed as required.

Embodiment 12

Figure 27 is the schematic cross sectional views of the 12nd embodiment's hydrodynamic gas-lubricated bearing.

What the hydrodynamic gas-lubricated bearing 9 of present embodiment used is the double-layer elastic liner.Be that polygonal elastic force liner 96 is inserted in the shell 95,, more main liner 98 inserted the bearing that forms to its inboard identical polygonal elastic force liner 97 of limit number that inserts.

Preferably, the drift angle that is mounted to inboard elastic force liner 97 is positioned on the position relative with the central position of the elastic beam of the elastic force liner 96 in the outside.

If make inboard and the outside the elastic force liner the two on identical circumferential position, disconnects and uses the card locking mechanism that illustrates previously that the two is fixed together, then can make assembly relation definite conscientiously.

In addition, more reliable for the rigging position that makes the elastic force liner, also inboard and outside elastic force liner can be produced on the smooth elastic sheet metal of a slice, be wound into two-layer cased.In addition, also an end of elastic force liner can be fixed on the inwall of shell.

Undoubtedly, the elastic force liner is not limited to two-layer, also can make the multi-layer structure of the elastic force laying with suitable quantity.

When adopting multi-layer structure, thereby, therefore, bearing can be manufactured the bearing that from the low speed rotation to the high speed rotating, can both support with the rigidity of appropriateness along with the more remarkable rigidity of effect of the elastic force liner outside the main liner expansion increases.

In addition, can rub when between elastic force liner and elastic force liner, contacting, thereby can make bearing vibration obtain decay.

Embodiment 13

Figure 28 is a kind of like this sectional view of hydrodynamic gas-lubricated bearing, that is, in this bearing, a plurality of elastic force liners are installed with the state with the part that overlaps each other, and makes friction to take place with the decay bearing vibration between the liner.

4 elastic force liners 100 equally are fixed on the outer casing inner wall 99 with the interval between the end of each liner, and install, wherein insert main liner 101 again with overlapped half state each other.

When running shaft vibrates, main liner 101 will act on elastic force liner 100 and they are rubbed mutually, therefore, can produce surface friction drag and make the vibration decayed.

Embodiment 14

Figure 29 is the schematic cross sectional views of the 14th embodiment's hydrodynamic gas-lubricated bearing.

The hydrodynamic gas-lubricated bearing of present embodiment is that the cross section of the endoporus of its bearing shell 102 is polygonal, and the slit that is assembled into elastic force liner 103 is located at rib 105 places that polygonal summit forms.

Preferably, the quantity of the rib of the formed polygon prism tube of the endoporus of bearing shell 102 is 2 times of quantity of the rib of elastic force liner 103 formed many ribs tubes, and is assembled into elastic force liner 103 formed elastic beams the rib of shell is clipped in the middle respectively.

When adopting this mounting type, can make the circulation that guarantees cooling air in the gap that forms later of elastic beam more greatly and fully, thereby but make the high speed rotating expanded range of the proper functioning of bearing.In addition, can elastic force liner 103 is fixing reliably by being alignd with the rib 105 of shell in the slit position, unnecessary dislocation can not take place.And, because the back of elastic beam is big, thereby with respect to main liner 104 its intrinsic flexible expanded range that had.

In the various embodiments described above, cited is the gas bearing that can use in air, but above-mentioned various structure can directly be used in oil or water.And use the FDB of oil and water is to work under lower temperature, therefore, and also can alternative metals and make smooth thin slice with macromolecular materials such as tetrafluoroethylene.

Claims (28)

1. liner type Hydrodynamic bearing, it is characterized in that, the elastic force liner that is formed by the smooth thin slice that is provided with a plurality of slits is installed on the inwall of bearing shell, in the inboard of this elastic force liner main liner is set, inboard at this main liner is provided with running shaft, said elastic force liner form in the little position bending of rigidity have with inwall in the polygonal cross-section of a plurality of elastic beams of side contacts, by said main liner said running shaft is carried out elastic support by this elastic beam.

2. liner type Hydrodynamic bearing as claimed in claim 1, it is characterized in that, said elastic force liner is in being installed in said bearing shell the time, on the direction parallel, be formed with slit, the intensity that is formed at the elastic beam between the adjacent slots adjusted based on slit length and slit separation with the axis cardinal principle of running shaft.

3. liner type Hydrodynamic bearing as claimed in claim 1, it is characterized in that, said elastic force liner is in being installed in said bearing shell the time, with the parallel substantially direction of the axis of running shaft on be formed with slit, the width separately by suitable this slit of setting comes the rigidity of support that makes progress in week of said running shaft is adjusted.

4. as claim 2 or 3 described liner type Hydrodynamic bearings, it is characterized in that, said elastic force liner carries out two-stage at least to the rigidity that produces by said slit to be selected, and bears weak rigidity when running shaft initially rotates, and bears strong rigidity when using rotation status always and be in.

5. as claim 2 or 3 described liner type Hydrodynamic bearings, it is characterized in that, the shape of said elastic force liner is the shape that widely cuts out said slit, and different because of the difference of the distance of the whole thin slice end of anomaly apart from the distance of the rib of adjacent slit, thereby rigidity is changed.

6. as claim 2 or 3 described liner type Hydrodynamic bearings, it is characterized in that said slit constitutes by being close to the slit that forms abreast, partly shares pushing force by many ribs that the inwall with said bearing shell contacts.

7. as claim 2 or 3 described liner type Hydrodynamic bearings, it is characterized in that, said elastic force liner except with the slit of the parallel axes of said running shaft, also be formed with the slit parallel with the side of this elastic force liner, said elastic beam is divided into a plurality of zones on the running shaft direction.

8. as claim 2 or 3 described liner type Hydrodynamic bearings, it is characterized in that, said elastic force liner except with the slit of the parallel axes of said running shaft, central position at said elastic beam also is formed with a plurality of slits parallel with the side of this elastic force liner, makes this elastic force liner be out of shape and face contact with it along the part surface of said main liner.

9. liner type Hydrodynamic bearing as claimed in claim 2 is characterized in that, have on the said elastic force liner shape identical, uniformly-spaced arranging the slit that forms.

10. liner type Hydrodynamic bearing as claimed in claim 9 is characterized in that, as the slit length of the slit length of said slit and the length ratio of the short side direction of said elastic force liner than more than 80%～below 90%.

11. liner type Hydrodynamic bearing as claimed in claim 10 is characterized in that, said slit length than more than 80%～below 85%.

12. liner type Hydrodynamic bearing as claimed in claim 9, it is characterized in that, in the occasion that bending deflection that said elastic force liner is born is shared in proportion by said slit and the elastic beam that forms between said slit and adjacent with it said slit, the diastrophic ratio of being born by said elastic beam among the bending deflection of said elastic force liner is below 15%.

13. liner type Hydrodynamic bearing as claimed in claim 9 is characterized in that, the groove width of said slit is more than 1.0 times of thickness that are used for forming the smooth thin slice of said elastic force liner.

14. liner type Hydrodynamic bearing as claimed in claim 2 is characterized in that, has a plurality of slits to form to central authorities from the side of elastic force liner on the said elastic force liner.

15. as claim 1,2,3,9 and 14 the described liner type Hydrodynamic bearing of arbitrary claim, it is characterized in that, the cross section of the endoporus of said bearing shell is polygonal and forms, and the slit that is mounted to said elastic force liner is positioned at this place, polygonal summit.

16., it is characterized in that said elastic force liner is wound into multilayer as claim 1,2,3 and 9 the described liner type Hydrodynamic bearing of arbitrary claim around said main liner.

17. as claim 1,2,3,9 and 14 the described liner type Hydrodynamic bearing of arbitrary claim, it is characterized in that, have and on the position of the said outer casing inner wall that two ends contacted of said main liner, be formed with the stop wall of holding up from inner wall surface respectively and be formed with the recess of cross section shape triangular in shape in the front of this stop wall and the card locking mechanism that constitutes, said main liner is being stretched intercalation between said two stop wall and make it fixing.

18. liner type Hydrodynamic bearing as claimed in claim 17 is characterized in that, said recess is that the inlet side of this bearing sense of rotation is darker than outlet side.

19. liner type Hydrodynamic bearing as claimed in claim 17 is characterized in that, has severally to said card locking mechanism, said main liner is stuck upwards being split in week with the section of the logarithm equal number of this card locking mechanism.

20. liner type Hydrodynamic bearing as claimed in claim 17 is characterized in that, in said card locking mechanism, is provided with in the side of said stop wall and said main liner to be stopped makes it the backstop that can not move on width direction.

21. liner type Hydrodynamic bearing elastic force liner, constitute by the smooth thin slice that is provided with a plurality of slits, it is characterized in that, said slit when this elastic force liner is installed in the bearing shell with the direction of the parallel axes of running shaft on form, form elastic beam in this slit place bending between slit in the time of in this elastic force liner is packed this bearing shell into, formation has the tubular of polygonal cross-section.

22. liner type Hydrodynamic bearing elastic force liner as claimed in claim 21 is characterized in that, have on the said elastic force liner shape identical, uniformly-spaced arranging the slit that forms.

23. liner type Hydrodynamic bearing, it is characterized in that, the elastic force liner that is formed by the smooth thin slice that is provided with the slit that a plurality of coiling directions that are parallel to the elastic force liner arrange is installed on the inwall of bearing shell, in the inboard of this elastic force liner main liner is set, inboard at this main liner is provided with running shaft, said elastic force liner form in the little position bending of rigidity have with inwall in the polygonal cross-section of a plurality of elastic beams of side contacts, by said main liner said running shaft is carried out elastic support by this elastic beam.

24. liner type Hydrodynamic bearing as claimed in claim 23, it is characterized in that, said elastic force liner is in being installed in said bearing shell the time, with the parallel substantially direction of the axis of running shaft on be formed with said slit, the width separately by suitable this slit of setting comes the rigidity of support of said running shaft is adjusted on circumferentially.

25. liner type Hydrodynamic bearing as claimed in claim 23, it is characterized in that, have and on the position of the outer casing inner wall that two ends contacted of said main liner, be formed with the stop wall of holding up from inner wall surface respectively and be formed with the recess of cross section shape triangular in shape in the front of this stop wall and the card locking mechanism that constitutes, said main liner is being stretched intercalation between the surface of said stop wall and make it fixing.

26. liner type Hydrodynamic bearing elastic force liner, constitute by the smooth thin slice that is provided with a plurality of slits, it is characterized in that, said slit when this elastic force liner is installed in the bearing shell with the direction of the parallel axes of running shaft on form side by side, form elastic beam in this slit place bending between slit in the time of in this elastic force liner is packed this bearing shell into, formation has the tubular of polygonal cross-section.

27. liner type Hydrodynamic bearing elastic force liner as claimed in claim 26 is characterized in that, have on the said elastic force liner shape identical, uniformly-spaced arranging the slit that forms.

28. as claim 26 or 27 described liner type Hydrodynamic bearing elastic force liners, it is characterized in that, the parallel slit of side that said elastic force liner also is formed with a plurality of and said elastic force liner can make when this elastic force liner is installed in this bearing shell at this slit place along surf deform and the contact of realization face.

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