CN1095786C - Bearing assembly for bearing thrust mainly - Google Patents

Abstract

The present invention relates to a bearing assembly mainly used for bearing thrust, which is arranged on a rotating shaft which comprises a main rotating shaft and a thrust ring. The present invention comprises pressure sealing rings, a thrust pair, a vibration isolation rubber ring and a thrust block, wherein the annular thrust block is provided with a groove for placing the vibration isolation rubber ring on the front end, and the groove for placing the vibration isolation rubber ring forms a tight fit with the rubber ring; the thrust block provided with central holes matches with a tail casing part of the thrust pair to make the vibration isolation rubber ring clamped between the thrust pair and the thrust block; the thrust pair and the thrust block are correspondingly fixed, the main rotating shaft is sheathed with the thrust pair of which the front end part is sheathed with the pressure sealing rings with a clearance fit, and the thrust pair and the pressure sealing rings are correspondingly sealed; the front end faces of the pressure sealing rings abut on the thrust ring of the rotating shaft, the pressure sealing rings is fixed corresponding to the thrust block, the present invention is provided with a connecting sleeve, when the main rotating shaft generates vibration in operation, the sealing is kept between the thrust ring and the pressure sealing ring. The present invention also comprises a device for detecting shift of the main shaft and a hydraulic servo system for preventing the shift of the main shaft.

Description

Be mainly used in the bearing assembly of bearing thrust

The present invention relates to a kind of bearing assembly, more specifically, the present invention relates to a kind of bearing assembly that is applicable in the axle system based on rotary thrust, is mainly used in bearing thrust.

Now, the bearing that is used to support rotating screw slurry axle aboard ship mainly is antifriction-bearing box or plain bearing, accept the vital parts of thrust by its conduct, because these bearings and propeller live spindle have metallic contact, so there is the friction under the big pressure, and live spindle rotates the longitudinal vibration that causes and causes bearing failure easily, causes its serviceability poor, and the life-span shortens.

The objective of the invention is to provide a kind of being applicable in axle system to accept thrust, can isolate the bearing assembly of the axial vibration (longitudinal vibration) that the rotation owing to S. A. produces simultaneously based on screw propulsion.

According to the present invention, a kind of bearing assembly that is mainly used in bearing thrust is provided, this bearing assembly is installed on the S. A., described S. A. comprises live spindle and the thrust collar of making one, this bearing assembly comprises the envelope pressure ring, thrust is paid, vibration isolation cushion rubber and thrust bearing, described thrust bearing is an annular, front end has vibration isolation cushion rubber standing groove, cushion rubber fits snugly in the cushion rubber standing groove, described thrust bearing has centre hole, this centre hole of tail cover partial sum that described thrust is paid cooperates, make the vibration isolation cushion rubber be clipped in that thrust is paid and thrust bearing between, thrust is paid and the thrust bearing relative fixed, thrust is paid and is enclosed within on the live spindle, be enclosed within to envelope pressure ring free-running fit on the fore-end that thrust pays, sealing relatively between the two, the front end face of envelope pressure ring is against on the thrust collar of S. A., envelope pressure ring relative force seat is fixed, be provided with coupling sleeve, be used for when the live spindle in running condition has vibration, keep the sealing between thrust collar and the envelope pressure ring, this assembly also comprises, the hydraulic efficiency servo of surveying the main shaft Displacement system and preventing main shaft to be shifted.

According to bearing assembly of the present invention, comprise that envelope pressure ring, thrust pays, vibration isolation cushion rubber and thrust bearing, thrust bearing is fixed in the bearing seat that is arranged in the hull during use, the vibration isolation cushion rubber fits snugly in the cushion rubber groove of thrust bearing, and the tail cover part that thrust is paid is inserted in the inner chamber of thrust bearing, and an end face of the fore-end that thrust is paid props up the vibration isolation cushion rubber, make the vibration isolation cushion rubber between thrust bearing and thrust are paid, thrust is paid and the thrust bearing relative fixed.The fore-end that thrust is paid inserts the centre hole that thrust is paid with the inner chamber free-running fit of sealing pressure ring, live spindle, and the thrust collar on the live spindle is resisted against on the end face of envelope pressure ring.The end face of being paid by envelope pressure ring, thrust collar, live spindle and thrust forms the pressure chamber like this.Liquid is arranged in the pressure chamber.When live spindle rotates, the bearing assembly relative fixed, and to the generation of the liquid in pressure chamber pressure, this pressure can not overcome the envelope pressure ring goes out, and can only promote thrust and pay, and then promote thrust bearing by the vibration isolation cushion rubber, the vibration isolation cushion rubber can be isolated longitudinal vibration, and thrust bearing is passed to bearing seat to thrust, and then promotes hull, this bearing assembly also comprises the device of surveying the main shaft displacement and the hydraulic efficiency servo of adjusting the main shaft displacement.

Because bearing assembly of the present invention is when accepting thrust, not along the metal direct contact of thrust direction, thus there is not friction big pressure under, simultaneously can be most of or all isolate the longitudinal vibration of live spindle, so reliability improves, bearing extends service life.Simultaneously because bearing of the present invention mainly is to bear the liquid static thrust, can utilize the effect of liquid diffusion pressure, several groups of thrust barings are installed simultaneously, accept thrust simultaneously along live spindle, help hull structure, can significantly improve vibration isolation ability longitudinal vibration.

With reference to the accompanying drawings,, describe the present invention in conjunction with one embodiment of the present of invention, wherein:

Fig. 1 is that bearing assembly of the present invention is installed in the scheme drawing on the S. A., and this illustrates the basic structure and the principle of work of bearing assembly of the present invention;

Fig. 2 is the end view of envelope pressure ring;

Fig. 3 is the front end face scheme drawing that thrust is paid;

Fig. 4 is the structural representation that thrust is paid;

Fig. 5 is the inside face expansion drawing that thrust is paid;

Fig. 6 is the structural representation of thrust bearing;

Fig. 7 A and Fig. 7 B are respectively the constructionals drawing of surveying the main shaft Displacement system;

Fig. 7 B is the scheme drawing of surveying after the assembling of main shaft Displacement system;

Fig. 7 C is the cutaway view along A-A line among Fig. 7 B;

Fig. 8 is the fundamental diagram that hydraulic efficiency servo is shown.

With reference to Fig. 1, bearing assembly according to the present invention comprises that envelope pressure ring 4, thrust pay 5, vibration isolation cushion rubber 6 and thrust bearing 7.This bearing assembly is installed on the live spindle 1, and this live spindle 1 has the thrust collar 2 that is made into integration.Thrust bearing 7 is installed in the bearing seat on the hull.Vibration isolation cushion rubber 6 fits snugly in the cushion rubber standing groove on the thrust bearing 7, and thrust is paid 5 the tail cover part inner chamber free-running fit with thrust bearing 7, makes vibration isolation cushion rubber 6 be clamped in thrust bearing 7 and thrust is paid between 5.Envelope pressure ring 4 is enclosed within thrust and pays on 5 the front end outer peripheral portion.The front end face of envelope pressure ring 4 is resisted against on the thrust collar 2.Live spindle 1 inserts thrust and pays 5 inner chamber.Live spindle 1 respectively is equipped with a bearing assembly in the both sides, front and back of its thrust collar 2, and the envelope pressure ring 4 of former and later two bearing assemblies links together by coupling sleeve 8.Between envelope pressure ring 4 and thrust pay 5 by O-ring seal 55 sealings, thrust pay 5 and live spindle between an O-ring seal 56 also is set, envelope pressure ring 4 utilizes square tubing string relative force seat 7 fixing along turning to.When live spindle 1 rotated, bearing assembly was maintained fixed.Envelope pressure ring 4, thrust collar 2, live spindle 1 and thrust are paid 5 end face and have been constituted a compressed pressure chamber 3, full of liquid in this pressure chamber.Because the existence of liquid and the rotation of live spindle 1 and thrust collar 2 in the pressure chamber 3, between envelope pressure ring 4 that is in contact with one another and thrust collar 2, O-ring seal 55 and thrust are paid between 5, all a kind of friction that film lubrication is arranged between O-ring seal 56 and the live spindle 1, and main shaft 1 that contacts with bearing assembly and thrust collar 2 chrome-faceds become a pair of fastness with the envelope pressure ring made from spheroidal graphite iron or graphite cast iron material.Live spindle 1 rotating band dynamicthrust ring rotation compressed pressure chambers 32.Liquid in the pressure chamber 3 is compressed by the rotation of thrust collar 2 and live spindle 1, can not overcome envelope pressure ring 4, can only promote thrust and pay 5, because the liquid in the pressure chamber has only viscous effect, therefore pass to thrust and pay just static thrust of 5, if live spindle 1 produces various longitudinal vibrations, vibration isolation cushion rubber 6 just can be isolated this vibration, therefore paying 5 by vibration isolation cushion rubber 6 by thrust, what be delivered to thrust bearing 7 is static thrust, bearing seat on the hull is subjected to the thrust of thrust bearing 7, and then thrust passed to hull, promote hull.Therefore in this thrust bearing assembly, do not have longitudinal vibration, do not have intermetallic direct contact yet along thrust direction.

The structure function of coupling sleeve 8 mainly is when the live spindle in running condition has vibration, can keep the sealing between moving part and the quiet part.Because pressure chamber 3 is made up of half moving part and half quiet part, especially moving part also is accompanied by various vibrations in rotation.So the sealing load chamber is the difficulty that has to a certain degree.And the structure of coupling sleeve can be under the situation of any oscillation frequency and intensity, keep the sealing between thrust collar 2 and the envelope pressure ring 4, and vibration is separated, carry out the sealing of similar static seal again by O-ring seal 55, this structure can keep the dependable performance of this thrust baring.

Show the end view of sealing pressure ring 4 with reference to Fig. 2, specifically illustrated the end face of envelope pressure ring 4 and thrust collar 2 mutual lubricities frictions.By diagram as can be known, be provided with several wedge shape pits 41 at this end face, the main application of wedge shape pit 41 is to set up lubricant film between envelope pressure ring 4 and thrust collar 2, and this lubricant film is the maximum outside diameter oil film of thrust collar when originally rotating.Wedge shape pit 41 outward extending length approximately are in the end face between circle and the end face cylindrical 2/3rds of total length, this end face 41 also is provided with logical outer tiltedly oil and cheats 42 between each wedge shape pit simultaneously, logical outer tiltedly oil hole 42 is along turning to nearly half length to stretch in the aforementioned oil film, in thrust collar 2 rotation processes, because logical outer tiltedly oil hole 42 is gradually to overhanging, when the viscous effect of oil film makes oil film run into logical outer tiltedly oil in rotation process to cheat 42 cutting edge of a knife or a sword mouth, gradually lubricating oil is pulled along outwards turning to, until lubricated whole friction face.The degree of depth in logical outer oil hole 42 approximately is 0.5mm, and width is about 2-4mm, and the degree of depth should be suitable, like this when live spindle 1 stops operating, lubricating oil when rotating again, can lubricate whole friction face because its viscous effect can stick in the oil hole with the corner of minimum next time.For preventing to seal pressure ring 4 because by oil film contact thrust collar 2, when thrust collar 2 rotations, driven by the viscosity of oil film and rotate, and on envelope pressure ring 4, a plurality of open pores 43 are set, utilize a square tubing string 9, the rear and front end of square tubing string 9 is fixed on the thrust bearing 7 of front and back bearings assembly, in interleave the open pore 43 of envelope pressure ring 4, rotate thereby prevent to seal pressure ring 4.As shown in Figure 1, should leave the gap between the open pore 43 of envelope pressure ring 4 and the square tubing string 9, in order to avoid hinder the vibration of envelope pressure ring 4 response thrust collars 2.There is metallic contact between envelope pressure ring 4 and the square tubing string 9, therefore square tubing string 9 best chromium plating.The periphery of envelope pressure ring 4 also is provided with the hole that is used to pass screw, be used for the envelope pressure ring 4 of front and back two thrust bearing assemblies is coupled together by coupling sleeve 8, also should be provided with the deflation hole 46 that is used for air in the discharge pressure chamber 3 on the envelope pressure ring 4, the gangway 47 that deflation hole 46 will make progress and be used to import lubricating oil and be connected with other thrust bearing assembly during installation.

Vibration isolation cushion rubber 6 mainly is to be used for paying 5 with thrust by thrust to pass to thrust bearing 7.It is paid between 5 at thrust bearing 7 and thrust, also is used to isolate longitudinal vibration simultaneously, and vibration isolation cushion rubber 6 and thrust are paid 5 area of contact should have enough abilities to accept longitudinal vibration, the total thrust in the time of will being enough to overcome maximum engine torque simultaneously.Could isolate longitudinal vibration well like this.In addition as Fig. 1 as can be seen, vibration isolation cushion rubber 6 is provided with through hole and is used for bearing vibration when the compound compression at cushion rubber, and more expansion space is arranged, and has on the cushion rubber of vibration isolation simultaneously 6 to be applicable to thrust and to pay 5 structures that are connected with thrust bearing 7.

It mainly is to be used to constitute pressure chamber 3 that thrust is paid 5 front end face, accept the thrust that the liquid in the pressure chamber 3 transmits simultaneously, as shown in Figure 3, pay in thrust on 5 the front end face wedge-shaped impression 51 is set, when the pressure medium in the pressure chamber 3 meets accident, this end face contacts with the thrust collar 2 of preshoot, sets up oil film, thereby prevents owing to bigger impulse force causes damage.Thrust is paid 5 and is enclosed within on the main shaft, and the diameter of its inner chamber should be the main shaft diameter and adds oil film thickness (0.0012mm).This size value is very important because thrust pay 5 and main shaft 1 between be sealed with more than 90% by this size and realize.Thrust is paid between 5 inner chambers and the main shaft 1 O-ring seal 56 is set simultaneously, this cushion rubber 56 is placed on thrust in the oblique mode of putting and pays in 5 the oblique aprons slot near tail end, the inclined-plane ring set 14 that matches by shape and oblique aprons slot is pressed on thrust with logical heart nut and pays in 5 the inner chamber.It is oblique why sealant ring recess 57 adopts, be because like this when live spindle rotates, the lubricant film that adheres on the live spindle 1 can enter gap between cushion rubber and the main shaft 1 by the circular wedge surface of O-ring seal 56 and lubricate, thereby prolongs the life-span of O-ring seal.

With reference to Fig. 5 the importing situation that thrust is paid 5 inner chamber lubricating oils is shown, thrust is paid 5 inner chambers and is provided with many edges and turns to deep gradually wedge-shaped impression 58 and many edges to turn to the importing oil groove 59 that stretches into gradually, when live spindle 1 rotates, pressure in the pressure chamber 3 is pressed into wedge-shaped impression 58 to lubricating oil, set up oil film simultaneously, because importing oil groove 59 stretches in the oil film, when oil film runs into the cutting edge of a knife or a sword mouth through importing oil groove 59, the viscous effect of lubricating oil can import lubricating oil wherein along turning to, until the whole friction face of film lubrication.Importing oil groove 59 simultaneously wherein will have the oblique aprons slot of a conducting innermost, as label among Fig. 5 59 that.

Thrust is paid 5 tail cover part and is inserted in the endoporus of thrust bearing 7.Simultaneously thrust is paid 5 rear end part and is provided with and is used for paying 5 screws 52 that are fixed together with thrust bearing 7 with thrust.Thrust is paid 5 fore-end and is also had aprons slot 54, is used for placing therein cushion rubber 55, realize thrust pay 5 and envelope pressure ring 4 between sealing.

Show the concrete structure of thrust bearing 7 with reference to Fig. 6.Thrust bearing 7 is provided with vibration isolation cushion rubber standing groove 72, between the front end face of thrust bearing 7 and the vibration isolation cushion rubber standing groove 72 is the expansion space groove, its diameter is greater than the diameter of vibration isolation cushion rubber, expansion when this expansion space groove compresses for the cushion rubber double vibrations is provided with, during assembling, the vibration isolation cushion rubber tightly inserts in the cushion rubber standing groove 72 of thrust bearing 7, becomes an annex of thrust bearing.Thrust is paid the inner chamber that 5 tail cover 53 inserts thrust bearings 7, in view of having the longitudinal movement friction between the two, so the best chromium plating of thrust bearing 7 inner chambers.When thrust bearing 7 is paid 5 assemblings with thrust simultaneously, screw rod puts the spring 10 that a sleeve passes the spring eye 71 that is positioned at thrust bearing 7, holddown spring 10, and be tightened on thrust by vibration isolation cushion rubber 6 and pay in 5 the tapped bore 52, this screw rod is paid 5 by spring force with thrust and is pulled to thrust bearing, thereby vibration isolation cushion rubber 6 is pressed in the vibration isolation cushion rubber standing groove 72 of thrust bearing 7.Thrust bearing 7 belongs to prior art with being connected of hull bearing seat, will not state more herein.

Be main shaft location and hydraulic efficiency servo at last.

Main shaft if any pressure chamber has is sewed before no-fix, and main shaft can be paid end face and back thrust at forward thrust and pay between the end face and to move arbitrarily.Boats and ships thrust baring in navigation night and day can constantly have slightly sews, these are sewed and are not directly to be extruded by pressure chamber 3, because the basic incompetence of pressure in the pressure chamber 3 runs through the viscosity of oil film, sewing is that oil film is constantly being squeezed out in the operation process, and these oil that squeezed out can not go back, take care of the pence in the course of time.These take care of the pence sews from the pressure chamber 3 and spills, and this just shows that the oil in the pressure chamber 3 have lacked.Under the screw propeller pushing, main shaft has only displacement, if allow main shaft constantly be shifted, in any case neither a good phenomenon.

Therefore need set up one group of device, prevent the forward and backward displacement of main shaft.

Main shaft displacement detector comprise a fully loaded liquid rubber bag (liquid taking is done probing medium, be because liquid can not press characteristic, the detection that can make detector can distortion).A rubber bag wherein end will seal, and the other end is installed the device of surveying the main shaft displacement, shown in Fig. 7 A.Whole device is installed in the periphery of the thrust bearing 7 of thrust bearing assembly.As Fig. 7 C, utilize the vibration of 4 pairs of thrust collars 2 of envelope pressure ring and displacement to have good responsibility to do the signal source of displacement.Load onto the device of compressing rubber bag at envelope pressure ring 4, the pressure of this device and the spring pressure of detector are in pairs to pressure.11 is pressing plates among Fig. 7 C, joins by governing screw 12 and envelope pressure ring 4.Because envelope pressure ring 4 is that whole annular rubber bag is done the large tracts of land compression of anchor ring or loosened rubber bag,,, will be the effect of big displacement with respect to the small size of detector even if envelope pressure ring 4 has some little displacements.This also is the effect that this detector will obtain.Simultaneously, this detector cooperates hydraulic efficiency servo, only selects for use one of them detector just passable in all forward and backward thrust barings.

It below is the running of oil circuit and each valve of hydraulic efficiency servo.Here at first to illustrate, hydraulic efficiency servo is not before operating, at first add a pressure in the pressure chamber of all forward and backward thrust barings, even this pressure main shaft constantly is shifted, this pressure still exists, this pressure has been arranged, and longitudinal vibration just is subjected to the restriction of bearing assembly of the present invention.Fig. 8 is the full figure of hydraulic efficiency servo of the present invention.Above-mentioned pressure provides A by figure medi-spring pressure accumulator A, does accumulator pressure with spring, is because this pressure is little, about 0.5-5kg/cm, and also elasticity is from the metal natural characteristic, so it is reliable to work.

Fig. 8 has two groups of oil circuits, and one group is forward thrust bearing oil circuit, and another group is back thrust baring oil circuit (here with a bit and not point come respectively).Every group of oil circuit all has one group to flow to opposite check valve and be connected with spring pressure accumulator A.When all oil circuits do not have pressure, spring pressure accumulator A will promote liquid, open two No. 1 check valves, represent with B among the figure, pressure is sent to all thrust bearing assemblies of front and back by oil circuit, when the spring pressure that adds No. 1 check valve up to oil circuit pressure equaled the pressure of pressure accumulator A, No. 1 check valve B blocked oil circuit.The whole hydraulic efficiency servo of Fig. 8 all is around the forward and backward displacement of main shaft is resetted, so total system has only two signals.

Can not surpass 0.3mm by design main shaft displacement reference number.

At first pass the position signal before the narration now: during ship's navigation, major part pushes away before being advances, so main shaft 1 major part is to shift forward, envelope pressure ring 4 compressing rubber bags during displacement, the while is the interior liquid of compressing rubber bag also, liquid can not overcome under the blockade on every side, can only overcome the probe from spring pressure, as 15 among Fig. 7 A, probe 15 is under pushing, thrust promotes push rod 17 by spheroid 16 and outwards stretches, when pushing away limit switch E before stretching shake-up.Referring now to Fig. 8,, limit switch E just touches oil pump K and change-over valve H, and oil pump K and preceding thrust bearing oil circuit are connected.Thrust bearing oil circuit before making lubricating oil inject resets main shaft.And change-over valve is promptly connected the pusher oil circuit on the other hand, pusher oil circuit and No. 1 blowdown valve D are connected.

In addition, owing to pass in the position before live spindle 1, the pusher oil circuit still has pressure.So when live spindle 1 moves, also can compress the pusher oil circuit simultaneously after resetting.If at this moment spring pressure accumulator A has only parts of lubricating oil or discontented, the pressure of oil pump will pass through main shaft, compression pusher oil circuit, when the pusher oil circuit obtains with oil pump K pressure about the same, will push check valve C open No. 2, at this moment the pusher oil circuit communicates with No. 1 blowdown valve D by change-over valve H simultaneously, but since at this moment the oil sealing pressure of No. 1 blowdown valve D be higher than the pressure of No. 2 check valve C, so at this moment No. 1 blowdown valve still cuts out oil circuit.And before push away No. 2 check valve C and also can under pressure fuel pump, be open simultaneously, on one side at this moment main shaft resets, and lubricating oil is under pressure fuel pump, Yi Bian inject spring pressure accumulator A.If at this moment main shaft resets earlier, the push rod of detector also can be got back to meta, so before push away that limit switch cuts out, oil pump also can shut down, change-over valve blocks each oil circuit, No. 2 check valve C are not owing to overcome the pressure of itself, so also can block oil circuit, at this moment oil circuit decommissions, and waits for next signal.

If at this moment main shaft does not reset, lubricating oil just inject the spring pressure accumulator by two No. 2 check valve C, blocks oil circuit until the spring pressure accumulator under pressure fuel pump, and No. 2 check valve C just blocks oil circuit.If at this moment main shaft does not also reset, because the loop of change-over valve H and pusher oil circuit are connected, and connect blowdown valve D No. 1, so the pressure of oil pump will be added on the pusher oil circuit by main shaft, thereby compel out No. 1 blowdown valve D, lubricating oil is got back to oil cylinder, reset up to main shaft, make all oil circuits decommission again.It and then is the pusher shift signal.If the main shaft pusher or stop the position of time envelope pressure ring after move, so, the spring pressure of detector will laterally cut somebody's hair 18 by what pass that support connects push rod, as Fig. 7 A, push rod 17 is pushed away to the inside, and by spheroid 16 probe 15 is pushed to rubber bag, the while is the interior liquid of compressing rubber bag also.Push rod after move in, as long as touch pusher limit switch F (Fig. 8), the pusher limit switch starts oil pump and change-over valve simultaneously, and oil pump K and pusher oil circuit are connected, the preceding oil circuit that pushes away is connected change-over valve H loop and is connected with No. 1 blowdown valve D.It is the same that pusher displacement running and preceding passings position operate, and push away oil circuit before being and become the pusher oil circuit, and the pusher oil circuit pushes away oil circuit before becoming.

The spring pressure accumulator is when replenishing the oil mass sewed in addition, though the oil mass that also can replenish the spring pressure accumulator simultaneously when main shaft resets, the supply of oil mass in the course of time for safety should connect a cover in addition, and oil circuit connects oil pump, additional spring pressure accumulator.Simultaneously detector can respond to vibration and touches limit switch, so add a clock switch (about 30 seconds) between the limit switch of detector and change-over valve.Because this is a prior art, does not describe in detail here.

Claims (9)

1. bearing assembly that is mainly used in bearing thrust, this bearing assembly is installed on the S. A., described S. A. comprises live spindle (1) and the thrust collar (2) of making one, it is characterized in that, this bearing assembly comprises envelope pressure ring (4), thrust is paid (5), vibration isolation cushion rubber (6) and thrust bearing (7), described thrust bearing (7) is an annular, front end has vibration isolation cushion rubber standing groove (72), cushion rubber (6) fits snugly in the cushion rubber standing groove (72), described thrust bearing (7) has centre hole (73), tail cover part (53) and this centre hole (73) that described thrust is paid cooperate, making vibration isolation cushion rubber (6) be clipped in thrust pays between (5) and the thrust bearing (7), thrust is paid (5) and thrust bearing (7) relative fixed, thrust is paid (5) and is enclosed within on the live spindle (1), being enclosed within thrust to envelope pressure ring (4) free-running fit pays on the fore-end of (5) (51), sealing relatively between the two, the front end face of envelope pressure ring (4) is against on the thrust collar (2) of S. A., envelope pressure ring (4) relative force seat (7) is fixing, be provided with coupling sleeve (8), be used for when the live spindle in running condition has vibration, keep the sealing between thrust collar (2) and the envelope pressure ring (4), this assembly also comprises, the hydraulic efficiency servo of surveying the main shaft Displacement system and preventing main shaft to be shifted.

2. bearing assembly as claimed in claim 1, it is characterized in that described thrust pays the periphery of the fore-end of (5) and have groove, be used to place O-ring seal (55), realization thrust is paid the sealing between (5) and the envelope pressure ring (4), tail cover part inner chamber has the groove of placing cushion rubber (56), is used to realize that thrust pays the sealing between (5) and the live spindle (1).

3. bearing assembly as claimed in claim 2 is characterized in that, it is bevelled that described thrust is paid (5) tail cover part cushion rubber groove that inner chamber is opened.

4. as the described bearing assembly of claim 1,2 or 3, it is characterized in that the front end face that described thrust is paid has wedge-shaped impression (51).

5. bearing assembly as claimed in claim 4 is characterized in that described thrust pays the surface of internal cavity of (5) and have importing oil groove (59) between many wedge-shaped impressions (58) and the wedge-shaped impression (58).

6. bearing assembly as claimed in claim 1 is characterized in that the front end face of described envelope pressure ring (4) is provided with several wedge shape pits (41), and several logical outer tiltedly oil between wedge shape pit (41) are cheated (42).

7. bearing assembly as claimed in claim 1 is characterized in that having on the described vibration isolation cushion rubber (6) through hole (62) that makes the vibration isolation cushion rubber that more expansion spaces be arranged.

8. bearing assembly as claimed in claim 1 is characterized in that described thrust bearing (7) has the expansion space groove between vibration isolation cushion rubber (6) standing groove and its front end face.

9. one kind is mainly used in the bearing assembly composite set of isolating longitudinal vibration, described bearing assembly composite set comprises the described bearing assembly of one of a plurality of claims 1～8, be provided with thrust collar (2) in the middle of forward thrust bearing assembly and the back thrust bearing assembly, and be installed in relatively with thrust collar (2) and make on the live spindle (1) of one, it is characterized in that: before described bearing assembly composite set also comprises, back thrust baring oil circuit, described a plurality of bearing assembly is installed on the live spindle (1) as required, before described, back thrust baring oil circuit is that the pressure chamber (3) with the forward thrust bearing interconnects with oily trunnion by interface (47), allows the lubricating oil in each pressure chamber (3) circulate mutually; The getting type of described back thrust baring oil circuit is identical with the getting type of described forward thrust bearing oil circuit, and described forward and backward thrust baring oil circuit is also connected pressure accumulator oil circuit and change-over valve (K) respectively.

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