CN100383392C

CN100383392C - Axial housing type gear pump mounted with rolling bearing and gear motor

Info

Publication number: CN100383392C
Application number: CNB2004100722894A
Authority: CN
Inventors: 程安强
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-09-30
Filing date: 2004-09-30
Publication date: 2008-04-23
Anticipated expiration: 2024-09-30
Also published as: CN1755114A

Abstract

The invention provides an axle sleeve type gear pump with rolling bearings and a gear motor. A couple of gear pairs are arranged in the inner wall of an 8-shaped shell body. Both sides of each of the gear pairs are provided with side plates, and the outer side of each of the side plates is provided with four axle sleeves with bearings. The present invention is characterized in that each of the side plates is provided with an axial oil sealing mechanism of high pressure oil, the shape of two axle sleeves which are attached mutually is identical to the shape of a hole of an inner cavity, the axle sleeves are matched with the inner cavity and are installed in the inner cavity in zero air void mode, and the bearings arranged in the axle sleeves are rolling bearings. Because the high pressure oil is controlled between two side plates, the matching with zero air void is realized by the axle sleeves and the inner cavity, the action of hydraulic pressure is no longer born by the axle sleeves, and the deformation of the axle sleeves and the generation of abnormal noise are prevented; the purpose that the rolling bearings can be installed is realized, and the gear pump or a gear shaft motor with great discharge is further provided. The present invention has the advantage of reliable operation and is especially suitable for engineering machinery, mining machinery, etc. which have large impact load and high temperature rise and operate under adverse working conditions.

Description

The axle sleeve type gear pump of rolling bearing is housed

Technical field

The invention belongs to fluid transmission means, particularly relate to a kind of axle sleeve type gear pump that rolling bearing is housed that in hydraulic system, is used as power source or actuator.

Background technique

The axle sleeve that a pair of intermeshing two ends are had the gear of axle and bearing is housed all is contained in a kind of gear pump in the housing, is referred to as the axle sleeve type gear pump.Change slightly on this basis, can develop into the axle sleeve type gear motor.

At present, the bearing that this axle sleeve type gear pump is adopted is a sliding bearing, since coming out from its recent decades, because it structurally can keep the concentricity between fore bearing and the rear bearing preferably, simple and reasonable, and become the structural type of gear pump first-selection, obtained adopting widely.But this axle sleeve type gear pump also has certain narrow limitation, shows both ways: the one, and can only use sliding bearing can not use rolling bearing; The 2nd, the axle sleeve type gear pump of dress sliding bearing can only be accomplished 150cm on discharge capacity ³Below/the rev, big discharge capacity is difficult to realize.Trace it to its cause: be because the axial oil sealing of its high pressure oil is located at the outside of axle sleeve, make high pressure oil enter into axle sleeve periphery outside the side plate, cause axle sleeve to be under the effect of high pressure oil, and because suffered axial force and the radial force of axle sleeve interfered mutually, be difficult to the axial seal that keeps good, axle sleeve except to bear gear pump intrinsic through gear shaft, bearing is delivered to outside the radial force on the axle sleeve, also to bear the hydraulic coupling that high pressure oil directly acts on the axle sleeve periphery, this will cause the distortion of axle sleeve, thereby cause the bearing deformation that is contained in the axle sleeve, make the bearing cisco unity malfunction produce unusual noise, and then limited the increasing of discharge capacity.More than cause the axle sleeve type gear pump can not use the little rolling bearing of play and on discharge capacity, can not surpass 150cm ³/ rev.

Summary of the invention

The present invention provides a kind of employing rolling bearing for solving the technical problem that exists in the known technology, can realize that big discharge capacity requires and the reliable axle sleeve type gear pump that rolling bearing is housed.

The technological scheme that the present invention takes for the technical problem that exists in the solution known technology is:

A kind of axle sleeve type gear pump that rolling bearing is housed, be provided with protecgulum, bring the housing of mouth and outlet into, bonnet, and together with bolton, on on protecgulum and the bonnet and junction plane housing, have groove and be equipped with seal ring, having two equal diameters on the housing perpendicular to protecgulum and bonnet and the gear hole that is the figure of eight that intersect on the perpendicular bisector of heart line therein, it constitutes the inner chamber of housing, intermeshing two ends are housed in inner chamber have the active of axle and the gear pair that driven gear is formed, the side plate that has with the corresponding hole of axle of the active of gear pair and driven gear is installed in the both sides of gear pair, in each gear hole in two side plate outsides the axle sleeve that bearing is housed is installed all, supporting the axle of active and driven gear respectively, driving gear towards the shaft extension of protecgulum one end for protecgulum outside, on the protecgulum of itself and protecgulum connecting place the self-tightening sealing circle is housed, it is characterized in that: the waist of two crossing gear holes in its intersection that constitutes the housing inner chamber keeps it to intersect formed inside wedge angle fully, presents complete figure of eight hole shape; The hole shape of the profile of described side plate and housing inner chamber coincide and also to have figure of eight shape but concave into corresponding to two sharp corners of housing inner chamber; On side plate, be provided with by side plate itself and peace O-ring seal and the axial oil sealing of the high pressure oil mechanism that constitutes of Sealing shield ring thereon; The supporting active in two side plate outsides and four axle sleeves of passive tooth wheel shaft, the profile of two axle sleeves of fitting all is the identical figure of eight shape of hole shape of two gear holes that intersect with the housing inner chamber mutually, in the inner chamber that is inlaid in housing of its voidlessness coupling; The bearing of installing in the axle sleeve is a rolling bearing.

The present invention can also adopt following technical measures:

The structure of the axial oil sealing of the high pressure oil that side plate is provided with mechanism is to have the high pressure unloading groove in the centre towards oil outlet one side (high pressure side) of the inboard of side plate, have the shallow slot that is the figure of three that extends to oil-feed oral-lateral (low voltage side) along the high pressure unloading groove, the opposite side relative with the high pressure unloading groove has the low pressure compensating groove, the outside at side plate has along the groove that is the figure of three of the sealing of oil outlet side direction oil-feed oral-lateral extension along its outer rim, the surface of the neutral position that groove sealed is lower than the surface in the side plate outside and has open-work in the waist neutral position of the figure of three of its formation, and it communicates with the high pressure drain charge groove of side plate inboard; Described O-ring seal and groove adapt and also are the figure of three, be contained in the groove, and its section are bigger at the waist sharp corner part width in its outside; The profile of described Sealing shield ring is identical with the peripheral shape of O-ring seal and neutral position that it is inboard is thinner, is contained on the O-ring seal.

The structure of the axial oil sealing of the high pressure oil that side plate is provided with mechanism is, on the side plate inboard, following two ends have fan-shaped shallow slot along its outer rim, waist has the circular compensating groove of two symmetrical distributions, on the side plate outside, following two ends have the scalloped recess of sealing along its outer rim, a left side, right both sides have " people " font groove of sealing along its outer rim, the surface of four neutral position that groove sealed all is lower than the surface in the side plate outside and respectively has open-work and is connected with fan-shaped shallow slot and circular compensating groove on the side plate inboard respectively, be provided with little stage along the side plate edge between four grooves, make it to be coupled to each other; Described O-ring seal adapts with each groove respectively, is fan-shaped respectively and " people " font, is contained in the groove, and the section of " people " font O-ring seal is bigger at the waist sharp corner part width in its outside; The profile of described Sealing shield ring identical with 4 peripheries that are contained in the O-ring seal in the groove and link at the little stage place that connects groove form as a whole, its inboard is thinner corresponding to 4 neutral position that O-ring seal sealed, it is contained on the O-ring seal, also can make a kind of axle sleeve type gear motor that rolling bearing is housed.

Advantage and good effect that the present invention has are: because side plate of the present invention is provided with the axial oil sealing of high pressure oil mechanism, the axial oil sealing that makes high pressure oil be limited between two blocks of side plates rather than resemble general axis shell type gear pump or gear motor is provided in a side of the outside of axle sleeve, make high pressure oil enter the axle sleeve periphery, thereby make axle sleeve no longer bear the huge radial hydraulic pressure that causes by oil pressure, and the radial force that only need bear gear pump or gear motor intrinsic act on axle sleeve, and two of mutually fitting are the inner chamber that is inlaid in housing of the axle sleeve voidlessness coupling of complete figure of eight profile, the distortion of axle sleeve and the generation of extraordinary noise have been prevented effectively, the employing of above-mentioned measure, make it possible to the rolling bearing that uses play little, and then make discharge capacity can be increased to 150cm ³More than/the rev.Therefore, the present invention is reliable, has tangible advantage, it is big to be specially adapted to impact load, temperature rise, the hydraulic machinery of operation under the bad working environments environment is as engineering machinery and mining machineries such as excavator, loader, bulldozer, vibratory rollers, because the present invention can provide the gear pump and the gear motor of big discharge capacity, thereby can satisfy the requirement that above-mentioned machinery maximizes.

Description of drawings

Fig. 1 is the structural representation of the present invention during as pump;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the B-B sectional view of Fig. 1;

Fig. 4 is the outer shape schematic representation of side plate;

Fig. 5 is the planimetric map of figure of three O-ring seal;

Fig. 6 is the planimetric map of figure of three Sealing shield ring;

Fig. 7 is that the F of Fig. 1 is to partial enlarged drawing;

Fig. 8 is the C-C sectional view of Fig. 1;

Fig. 9 is the sectional view of the A-A position of the present invention during as motor;

Figure 10 is the schematic representation of the inboard shape of motor side plate;

Figure 11 is the schematic representation of motor side plate outer shape;

Figure 12 is the combination view of motor with O-ring seal;

Figure 13 is the planimetric map of motor with Sealing shield ring.

Label among the figure is respectively; 1, driving gear shaft; 2, passive tooth wheel shaft; 3, protecgulum seam; 4, self-tightening sealing; 5, protecgulum; 6, spacing back-up ring; 7, housing; 8, gear hole; 9, driving gear; 10, driven gear; 11, seal ring; 12, bonnet; 13, side plate; 14, rolling bearing; 15, axle sleeve; 16, bonnet drain pan; 17, figure-three O-ring seal; 18, figure-three Sealing shield ring; 19, gear hole; 20, protecgulum drain pan; 21, bolt; 22, filler opening; 23, housing; 24, housing inner chamber wedge angle; 25, oil outlet; 26, perpendicular bisector; 27, housing inner chamber wedge angle; 28, circular arc shallow slot; 29, drain charge groove aperture; 30, circular arc shallow slot; 31, waist recess; 32, high pressure drain charge groove; 33, high pressure drain charge groove; 34, waist recess; 35, closed pockets; 36, than low degree; 37, side plate profile; 38, side plate profile; 39, part width larger part; 40, middle thin location; 41, oil return aperture; 42, facet; 43, hydraulic fluid port; 44, hydraulic fluid port; 45, fan-shaped shallow slot; 46, aperture; 47, aperture; 48, aperture; 49, fan-shaped shallow slot; 50, aperture; 51, little stage; 52, scalloped recess; 53, than low degree; 54, little stage; 55, herringbone grooves; 56, than low degree; 57, little stage; 58, scalloped recess; 59, than low degree; 60, little stage; 61, herringbone grooves; 62, than low degree; 63, fan-shaped O-ring seal; 64, chev(e)ron seal cushion rubber; 65, local broad place; 66, the fan-shaped place of Sealing shield ring; 67, thin all thick places in the Sealing shield ring; 68, Sealing shield ring man type place; 69, thin all thick places in the Sealing shield ring; 70, Sealing shield ring connecting place; 71, Sealing shield ring connecting place; 72, the fan-shaped place of Sealing shield ring; 73, thin all thick places in the Sealing shield ring; 74, Sealing shield ring connecting place; 75, Sealing shield ring man type place; 76, thin all thick places in the Sealing shield ring; 77, Sealing shield ring connecting place; 78,8 font Sealing shield rings.

Embodiment

For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows;

Structure of the present invention is applicable to that promptly gear pump also is applicable to gear motor, is illustrated respectively as gear pump or gear motor with regard to it below.

Details are as follows as gear pump:

See also Fig. 1 to Fig. 8.Be provided with protecgulum 5, bring housing 7, the bonnet 12 of hydraulic fluid port and oil outlet into, and tighten together having groove respectively and being equipped with O-ring seal 11 on protecgulum and bonnet in order to prevent oil liquid leakage with the casing joint surface place with bolt 21.That on housing, have two equal diameters and heart O therein perpendicular to protecgulum and bonnet ₁And O ₂ Perpendicular bisector 26 on intersect have two inside wedge angles 24 and a gear hole that is the figure of eight 8 and 19 of 27, it constitutes the inner chamber of housing, two crossing gear holes that constitute the housing inner chamber keep it to intersect formed inside wedge angle at its waist that intersects fully, present complete figure of eight hole shape, filler opening 22 and oil outlet 25 are communicated with out the both sides in the middle of housing perpendicular to gear hole and with it, have drain pan respectively at 20 places of protecgulum and 16 places of bonnet, 41 and 23 places on the front side in the filler opening of housing and the sidewall of rear side have aperture respectively, it is connected with drain pan on protecgulum and the bonnet respectively, so that the leakage of oil of front and rear can flow back into filler opening.Driving gear 9 and the gear pair formed of driven gear 10 that a pair of intermeshing two ends have axle are housed in the inner chamber of housing, and the center of the axle 1 of driving gear and the axle 2 of driven gear is identical with the center of two gear holes of inner chamber respectively also to be O ₁And O ₂In the housing inner chamber of the both sides of gear pair, be separately installed with the side plate that is the figure of eight 13 that has with the corresponding hole of axle of the driving gear of gear pair and driven gear, the peripheral shape of side plate is intersected by two circles 37 identical with the gear hole diameter and 38 to be formed, match with the hole shape of housing inner chamber, for containing two inside wedge angles at housing

inner chamber

24 and 27 places respectively, its

waist

34 and 31 places fall in, be provided with by side plate itself on the side plate and be installed in O-ring seal 17 and the axial oil sealing of the high pressure oil mechanism that forms of Sealing shield ring 18 on its outside, its structure is in the side plate inboard (one side of the gear pair that reclines, see Fig. 3) 32 places, centre towards oil outlet one side (high pressure side) have circular high pressure unloading groove, along the high pressure unloading groove have to filler opening one side (low voltage side) extend respectively with O ₁And O ₂Two circular arc

shallow slots

28 and 30 for the center of circle, its integral body is the figure of three, to reach the purpose that enlarges the zone of high pressure, 33 places have the low pressure compensating groove with high pressure unloading groove opposing sideplates opposite side, (see figure 4) has the groove 35 that is the figure of three along the outer ring that surrounds into closed shape that oil outlet side direction oil-feed oral-lateral extends along its outer rim (edge of the gear hole that promptly reclines) in the side plate outside, the surface at 36 places, centre that groove sealed is lower than the surface in the side plate outside and has open-work at middle 29 places of the waist that is the figure of three of its formation, it communicates with the high pressure unloading groove of side plate inboard, O-ring seal 17 (see figure 5)s that the outer ring that adapts with groove also is the same figure of three are housed in the groove of the one-tenth closed shape in the side plate outside, its rectangular cross section is bigger at the recessed wedge angle 39 place's part widths of the waist in its outside, the identical centre 40 place's thinner thicknesses that also are the figure of three and its inboard of the profile of Sealing shield ring 18 (see figure 6)s with the peripheral shape of O-ring seal, it is contained on the O-ring seal, in each gear hole in two side plate outsides (one side of gear dorsad), the axle sleeve 15 that is pressed with rolling bearing 14 is installed all, totally 4, the cylindrical of axle sleeve and

gear hole

8 or 19 match, the cylindrical of the intersection of adjacent axle sleeve will remove one, form facet 42, facet is O to the distance at axle sleeve center ₁-O ₂1/2 of the line of centres, promptly the profile of two axle sleeves of fitting mutually all is and the identical figure of eight of housing inner chamber, in the inner chamber that is inlaid in housing of its voidlessness coupling, the outer ring of an end toward the outer side of 4 interior 4 rolling bearings that press-fited of axle sleeve all stretches out in outside the axle sleeve, what have on the extension of the housing washer of driving gear shaft front portion and the protecgulum installs the concentric hole of seam 3 with pump and matches, that 6 pairs of rolling bearings of back-up ring are housed in the hole is spacing, thereby has kept installing on the protecgulum the concentric of seam and driving gear shaft.The outer ring extension of the rolling bearing of the rolling bearing of driving gear axle head and two axle heads of passive tooth wheel shaft inserts in the hole of correspondence of protecgulum and bonnet respectively, and maintain the gap, it is spacing in addition to be provided with seam simultaneously, driving gear towards the shaft extension of protecgulum one end for protecgulum outside, on the protecgulum of itself and protecgulum connecting place self-tightening sealing circle 4 is housed, to prevent the axial leakage of fluid.

Under the drive of gear pump in external force, when driving gear rotates by direction shown in Figure 2, fluid is inhaled into from filler opening 22, extruding through gear pair is discharged high pressure oil from oil outlet 25, high pressure oil imports in the figure of three groove in the side plate outside through aperture 29 simultaneously, produce nose balance and try hard to recommend moving two side plates, overcome the axial separation force that the oil pressure of side plate inboard causes, abut on the side, two ends of gear pair, keep the axial seal of high pressure oil, this has just constituted a kind of axle sleeve type gear pump that rolling bearing is housed.

Be described as follows as gear motor: see also Fig. 9 to Figure 13.

Gear pump is reversible, but because motor has the requirement of two-way rotation, therefore, its structure will be done the change of some parts on the basis of gear pump, in order to reduce the narration of repetition, only the difference part of motor and pump is listed below: as shown in Figure 9, with the filler opening of the housing of pump and hydraulic fluid port 43 and the hydraulic fluid port 44 that oil outlet has same size instead, and, according to the common practice is the aperture of removing on the housing oil inlet hole oral-lateral wall, but spile at the center of driving gear shaft, with the leakage of oil importing bonnet of motor front portion, and cover discharge later on.In addition, the difference of gear pump and gear motor mainly is the axial oil sealing of the high pressure oil mechanism that is provided with on side plate, its structure is: on the inboard (see figure 10) of figure of eight side plate, following two ends have fan-shaped

shallow slot

45 and 49 along its edge, and have

aperture

46 and 50 respectively therebetween, waist has the circular drain charge groove of two symmetrical distributions, the center of two drain charge grooves also has

aperture

47 and 48, on the outside of figure of eight side plate (seeing Figure 11), following two ends have the

scalloped recess

52 and 58 that surrounds into closed shape along its outer rim, a left side, right both sides have " people "

font groove

55 and 61 that surrounds into closed shape along its outer rim, four centres that groove sealed 53,59, the surface at 62 and 56 places all is lower than the surface in the side plate outside and passes through aperture 46 respectively, 50,47 and 48 are connected with the fan-shaped shallow slot and the circular compensating groove of side plate inboard, be provided with little stage 51 between four grooves along the side plate edge, 54,57 and 60 make it to be coupled to each other, be equipped with respectively in the groove that four surround into closed shape and be fan-shaped respectively and O-ring seal 63 and 64 (seeing Figure 12) " going into " font with groove adapts, the rectangular cross section of " people " font O-ring seal is bigger at waist wedge angle 65 place's part widths in its outside, Sealing shield ring 78 (seeing Figure 13) is housed on knockdown O-ring seal, its profile with four be contained in the peripheral shape of O-ring seal after its stack mounting in the groove identical and link to each other at the little stage place that connects groove form as a whole, promptly go up, following two ends are fan-shaped 66 and 72, a left side, right both sides are " people "

font

68 and 75, in boundary and 70,71,74 are coupled to each other with 77 places and are in the same place, groove with the motor side plate outside, the little stage integral body that matches is the Sealing shield ring of figure of eight shape, and the neutral position thinner thickness periphery corresponding to four sector regions that O-ring seal sealed 67 and 73 places and 76 and 69 places, " people " font zone of the inboard of Sealing shield ring is thicker.Thus, by the side plate that has groove and dress four O-ring seals and the whole Sealing shield ring axial oil sealing of the high pressure oil mechanism that constituted motor jointly thereon, the axial seal that keeps motor whereby.

When from hydraulic fluid port 43 input high pressure oils, two blocks of motor side plates rely on hydraulic fluid port 44 1 sides under the oil pressure effect, between hydraulic fluid port 43 1 side body inner chambers and motor side plate, form the gap, oil pressure transmits in two fan-shaped shallow slots of motor side plate inboard through this gap, be delivered in two scalloped recess in the outside of motor side plate through aperture again, simultaneously, the aperture of oil pressure in the circular compensating groove of hydraulic fluid port 34 1 sides is communicated in " people " font groove in the motor side plate outside, oil pressure has formed the nose balance power of motor side plate in three grooves, overcome the axial separation force that the oil pressure of motor side plate inboard causes, make the motor side plate be adjacent to both sides at gear pair, the axial seal that keeps motor, simultaneously, the high pressure oil of hydraulic fluid port 43 inputs promotes the gear pair rotation, make the machine power of driving gear shaft output clockwise direction (forward) rotation as shown in Figure 9, this moment, hydraulic fluid port 44 was oil returns of motor, and " people " font groove outside the motor side plate of hydraulic fluid port 44 1 sides is to be under the low pressure of oil return.Otherwise, when from hydraulic fluid port 44 input high pressure oils, two blocks of motor side plates rely on hydraulic fluid port 43 1 sides under the oil pressure effect, between hydraulic fluid port 44 side plate housing inner chambers and motor side plate, form the gap, oil pressure is delivered in two fan-shaped shallow slots of motor side plate inboard through this gap, be delivered in two scalloped recess in the motor side plate outside through aperture again, the while oil pressure also aperture in the circular compensating groove of hydraulic fluid port 44 1 sides is delivered in " people " font groove of the motor side plate outside, oil pressure in three grooves has formed the nose balance power of motor side plate, overcome the axial separation force that the oil pressure of motor side plate inboard causes, make two blocks of motor side plates be adjacent to both sides at gear pair, the axial seal that keeps motor, simultaneously, the high pressure oil of hydraulic fluid port 44 inputs promotes the rotation of gear pair, make the machine power of driving gear shaft output counter clockwise direction (oppositely) rotation as shown in Figure 9, this moment, hydraulic fluid port 43 1 sides were oil returns of motor, and " people " font groove outside the motor side plate of hydraulic fluid port 43 1 sides is to be under the low pressure of oil return.Thus, the present invention becomes a kind of axle sleeve type gear motor that rolling bearing is housed that can two-way rotation.

Claims

1. axle sleeve type gear pump that rolling bearing is housed, be provided with protecgulum, bring the housing of mouth and outlet into, bonnet, and together with bolton, on on protecgulum and the bonnet and junction plane housing, have groove and be equipped with seal ring, having two equal diameters on the housing perpendicular to protecgulum and bonnet and the gear hole that is the figure of eight that intersect on the perpendicular bisector of heart line therein, it constitutes the inner chamber of housing, intermeshing two ends are housed in inner chamber have the active of axle and the gear pair that driven gear is formed, the side plate that has with the corresponding hole of axle of the active of gear pair and driven gear is installed in the both sides of gear pair, in each gear hole in two side plate outsides the axle sleeve that bearing is housed is installed all, supporting the axle of active and driven gear respectively, driving gear towards the shaft extension of protecgulum one end for protecgulum outside, on the protecgulum of itself and protecgulum connecting place the self-tightening sealing circle is housed, it is characterized in that: the waist of two crossing gear holes in its intersection that constitutes the housing inner chamber keeps it to intersect formed inside wedge angle fully, presents complete figure of eight hole shape; The hole shape of the profile of described side plate and housing inner chamber coincide and also to have figure of eight shape but concave into corresponding to two sharp corners of housing inner chamber; On side plate, be provided with by side plate itself and peace O-ring seal and the axial oil sealing of the high pressure oil mechanism that constitutes of Sealing shield ring thereon; The supporting active in two side plate outsides and four axle sleeves of passive tooth wheel shaft, the profile of two axle sleeves of fitting all is the identical figure of eight shape of hole shape of two gear holes that intersect with the housing inner chamber mutually, in the inner chamber that is inlaid in housing of its voidlessness coupling; The bearing of installing in the axle sleeve is a rolling bearing.

2. the axle sleeve type gear pump that rolling bearing is housed according to claim 1, it is characterized in that: the structure of the axial oil sealing of the high pressure oil that side plate is provided with mechanism is to have the high pressure unloading groove in the centre towards oil outlet one side of the inboard of side plate, have the shallow slot that is the figure of three that extends to the oil-feed oral-lateral along the high pressure unloading groove, the opposite side relative with the high pressure unloading groove has the low pressure compensating groove, the outside at side plate has along the groove that is the figure of three of the sealing of oil outlet side direction oil-feed oral-lateral extension along its outer rim, the surface of the neutral position that groove sealed is lower than the surface in the side plate outside and has open-work in the waist neutral position of the figure of three of its formation, and it communicates with the high pressure drain charge groove of side plate inboard; Described O-ring seal and groove adapt and also are the figure of three, be contained in the groove, and its section are bigger at the waist sharp corner part width in its outside; The profile of described Sealing shield ring is identical with the peripheral shape of O-ring seal and neutral position that it is inboard is thinner, is contained on the O-ring seal.

3. the axle sleeve type gear pump that rolling bearing is housed according to claim 1, it is characterized in that: the structure of the axial oil sealing of the high pressure oil that side plate is provided with mechanism is, on the side plate inboard, following two ends have fan-shaped shallow slot along its outer rim, waist has the circular compensating groove of two symmetrical distributions, on the side plate outside, following two ends have the scalloped recess of sealing along its outer rim, a left side, right both sides have " people " font groove of sealing along its outer rim, the surface of four neutral position that groove sealed all is lower than the surface in the side plate outside and respectively has open-work and is connected with fan-shaped shallow slot and circular compensating groove on the side plate inboard respectively, be provided with little stage along the side plate edge between four grooves, make it to be coupled to each other; Described O-ring seal adapts with each groove respectively, is fan-shaped respectively and " people " font, is contained in the groove, and the section of " people " font O-ring seal is bigger at the waist sharp corner part width in its outside; The profile of described Sealing shield ring identical with 4 peripheries that are contained in the O-ring seal in the groove and link at the little stage place that connects groove form as a whole, its inboard is thinner corresponding to 4 neutral position that O-ring seal sealed, it is contained on the O-ring seal, also can make a kind of axle sleeve type gear motor that rolling bearing is housed.