CN104100482A - Wear-resistant axial plunger type hydraulic pump - Google Patents
Wear-resistant axial plunger type hydraulic pump Download PDFInfo
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- CN104100482A CN104100482A CN201410357510.4A CN201410357510A CN104100482A CN 104100482 A CN104100482 A CN 104100482A CN 201410357510 A CN201410357510 A CN 201410357510A CN 104100482 A CN104100482 A CN 104100482A
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- swash plate
- plunger piston
- hydraulic pump
- slippery boots
- hydraulic pressure
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Abstract
The embodiment of the invention discloses a wear-resistant axial plunger type hydraulic pump, relates to the technical field of hydraulic pressure, and solves the problem of excessive wear to plunger piston shoe assemblies. The wear-resistant axial plunger type hydraulic pump comprises a housing consisting of two end covers and a shell provided with a through hole, wherein a cylinder block is arranged in the through hole; a swash plate is arranged between the cylinder body and one of the end covers; cylinder holes are circumferentially distributed in the cylinder block along the axial direction; plunger piston shoe assemblies are arranged in the cylinder holes respectively; one end of each plunger piston shoe assembly exposed out of each cylinder hole is pressed against the swash plate; a return ring is arranged between the swash plate and the cylinder block, and comprises an annular damping portion; the annular damping portion sticks close to motion circumferential surfaces on the outer sides of all plunger piston shoe assemblies, and first fluid gaps are formed between the annular damping portion and the outer side faces of the plunger piston shoe assemblies. The embodiment is mainly applied to various hydraulic pumps, in particular to total-water-lubricating hydraulic pumps.
Description
Technical field
The present invention relates to hydraulics field, relate in particular to wear-resistant axial plunger type hydraulic pump.
Background technique
Pluger type hydraulic pump is that more high-pressure service pump is used in hydraulics field, in order to allow in the cylinder hole of oil hydraulic pump, produce negative pressure to suck the liquid that needs supercharging, conventionally the plunger in cylinder hole need to be connected on an end face of return plate, and another end face of return plate need to be mortgaged on swash plate, and wherein return plate is arranged on ball pivot.
When by the motion of driven by motor oil hydraulic pump, return plate drives plunger to do piston movement in cylinder hole, realize the supercharging of liquid, adopt the mode of this return plate to realize the piston movement of plunger, return plate can produce larger radial effect power to plunger, cause plunger larger with the friction in cylinder hole in piston movement process, thereby make the wearing and tearing of plunger more.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art and wear-resistant axial plunger type hydraulic pump is provided, and reduces preferably the wearing and tearing of plunger.
For achieving the above object, the present invention adopts following technological scheme:
A kind of wear-resistant axial plunger type hydraulic pump, comprise the shell that two end caps and the housing with through hole form, in described through hole, be provided with cylinder body, between cylinder body and one of them end cap, be provided with swash plate, on described cylinder body, be laid with cylinder hole vertically according to circumference array, cylinder is respectively equipped with plunger piston slippery boots assembly in hole; One end and swash plate that each plunger piston slippery boots assembly is exposed to outside cylinder hole compress, between swash plate and cylinder body, be provided with backhaul circle, described backhaul circle comprises ring-type damper portion, described ring-type damper portion is near the motion circumferential surface in whole plunger piston slippery boots assemblies outside, and and the outer side surface of plunger piston slippery boots assembly between be provided with first fluid gap.
Preferably, described plunger piston slippery boots assembly comprises the slide part compressing with swash plate, and described fluid gap comprises the first fluid gap forming between ring-type damper portion and the motion circumferential surface in whole slide parts outside.
Preferably, described backhaul circle also comprises startup supporting portion, starts between supporting portion and swash plate and forms guiding groove, and on described plunger piston slippery boots assembly, correspondence is provided with upper saw pulley, and upper saw pulley moves in guiding groove.
Preferably, the width of described guiding groove is greater than the thickness of upper saw pulley.
Preferably, described plunger piston slippery boots assembly is provided with the neck being connected with upper saw pulley, and described startup supporting portion is near the motion circumferential surface in neck outside, and described fluid gap comprises the second fluid gap forming between startup supporting portion and the motion circumferential surface in neck outside.
Preferably, described oil hydraulic pump is filled with liquid in the cavity between swash plate and cylinder body in the course of the work, and described liquid enters first fluid gap and second fluid gap and the plunger piston slippery boots assembly of motion is produced to centripetal force.
Preferably, described second fluid gap is less than first fluid gap.
Preferably, described backhaul circle also comprises the first assembly department extending to form towards the end face of swash plate from ring-type damper portion, and described the first assembly department is fixed between swash plate and shell; And/or
Described backhaul circle also comprises the second assembly department extending to form towards the end face of cylinder body from ring-type damper portion, and the second assembly department is fixed between swash plate and cylinder body.
Preferably, between the inwall in each plunger piston slippery boots assembly and respective cylinder hole, be provided with hydraulic pressure cavity, cylinder body is provided with the intercommunicating pore that is communicated with hydraulic pressure cavity, and described plunger piston slippery boots assembly hydraulic pressure cavity volume when moving in cylinder hole reduces, hydraulic pressure cavity volume increase when described plunger piston slippery boots assembly move to swash plate.
Preferably, described backhaul circle adopts PEEK or PA6 or POM material to make.
The wear-resistant axial plunger type hydraulic pump of confession provided by the invention, due between plunger piston slippery boots assembly and swash plate, by return plate, be not connected, and be only to enclose outside to put backhaul circle, by the liquid in the gap between backhaul circle and plunger piston slippery boots assembly, play damping function, reducing centrifugal force reduces wear, and the fluid resistance that this liquid produces also can reduce friction for plunger piston slippery boots assembly itself, thereby reduce wear.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of oil hydraulic pump in prior art;
Fig. 2 is the structural representation of oil hydraulic pump in the embodiment of the present invention;
Fig. 3 is A part partial enlarged drawing in Fig. 2;
Fig. 4 is B part partial enlarged drawing in Fig. 2;
Fig. 5 is the C-C sectional view of cylinder body in Fig. 2;
Fig. 6 is the structural representation that in the embodiment of the present invention, cylinder body adopts two-stage step hole;
Fig. 7 is the assembling schematic diagram of backhaul circle and swash plate in the embodiment of the present invention;
Fig. 8 is D part partial enlarged drawing in Fig. 2;
Fig. 9 is E part partial enlarged drawing in Fig. 2.
Reference character: 10-end cap, 11-through hole, 20-housing, 30-cylinder body, 31-cylinder hole, 32-hydraulic pressure cavity, 33-intercommunicating pore, 34-Sealing, 35-flange, 36-communicating passage, 40-plunger piston slippery boots assembly, 41-plunger, 42-piston shoes, 43-upper saw pulley, 44-neck, 50-swash plate, 60-rotating shaft, 70-thrust button, 71-liquid inlet, 72-communication gap, 75-thrust plate, 80-mechanical sealing assembly, 81-axial seal, 82-the first assembling set, 83-the second assembling set, 84-O RunddichtringO, 90-backhaul circle, 91-ring-type damper portion, 92-first fluid gap, 93-starts supporting portion, 94-guiding groove, 95-second fluid gap, 96-the first assembly department, 97-the second assembly department,
100-cylinder body, 200-plunger piston slippery boots assembly, 300-return plate, 400-swash plate, 500-rotating shaft, 600-ball pivot.
Embodiment
Axial plunger type hydraulic pump of the prior art as shown in Figure 1, this oil hydraulic pump comprises cylinder body 100, plunger piston slippery boots assembly 200 and return plate 300, and plunger piston slippery boots assembly 200 and return plate 300 assemblings, return plate 300 compresses with swash plate 400, by the rotation of cylinder body 100, plunger piston slippery boots assembly 200 and return plate 300 integral body are moved with respect to swash plate 400, be equivalent to drive plunger piston slippery boots assembly 200 to do piston movement in cylinder hole by the rotation of return plate 300.Meanwhile, because return plate is to do oblique circular movement, so, ball pivot 600 is installed in rotating shaft 500, return plate 300 is hinged on ball pivot 600.
More than adopt the oil hydraulic pump of ball pivot and return plate structure to have following defect:
One, return plate and ball pivot take the larger space of oil hydraulic pump inside, cause the whole manufacture of oil hydraulic pump volume larger.
Two, return plate is along with plunger piston slippery boots assembly moves in a circle together, the centrifugal force that causes acting on plunger piston slippery boots assembly is larger, thereby make the larger relativity power of existence between plunger piston slippery boots assembly and cylinder hole, cause plunger piston slippery boots assembly and cylinder hole friction place to be easily worn, and the position of easily wearing and tearing is the one end towards swash plate.In addition, return plate directly produces active force to plunger piston slippery boots assembly, also can make plunger piston slippery boots assembly and cylinder hole friction place easily be worn.
Three, return plate belongs to direct contact with plunger piston slippery boots assembly and is connected, and causes and has larger active force between the two, easily causes plunger piston slippery boots assembly and the generation of return plate contacting point to add galling.
Four, the scheme that adopts return plate and ball pivot, also needing provides respective action power by spring, causes the component of oil hydraulic pump mounted inside more, and not only cost is higher, also makes assembling comparatively complicated.
In order to overcome the defect of oil hydraulic pump in prior art, the embodiment of the present invention provides a kind of axial plunger type hydraulic pump, below in conjunction with the accompanying drawing in the embodiment of the present invention, technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of axial plunger type hydraulic pump of hydraulic pressure backhaul, as shown in Figure 2, this axial plunger type hydraulic pump comprises two end caps 10 and housing 20, end cap 10 and housing 20 form the shell of this oil hydraulic pump, and be provided with through hole in housing 20, in this through hole, be provided with the cylinder body 30 between two end caps, on described cylinder body 30, according to circumference array, be laid with cylinder hole 31 vertically, described cylinder hole is 2 to 24, in cylinder hole, be respectively equipped with plunger piston slippery boots assembly 40, by the plunger piston slippery boots assembly 40 in each cylinder hole 31, carry out in turn piston movement, the supercharging of realization to liquid, also can realize liquid carrying for the motor of power, in order to overcome the defect of prior art, one end and swash plate that in the embodiment of the present invention, each plunger piston slippery boots assembly is exposed to outside cylinder hole compress, save return plate and ball pivot in prior art.On this inventive concept basis, the embodiment of the present invention also provides following embodiment.
Embodiment one
The embodiment of the present invention provides a kind of axial plunger type hydraulic pump that adopts hydraulic pressure backhaul mode, as shown in Figure 2, this axial plunger type hydraulic pump comprises two end caps 10 and housing 20, end cap 10 and housing 20 form the shell of this oil hydraulic pump, and be provided with through hole in housing 20, in this through hole, be provided with the cylinder body 30 between two end caps, on described cylinder body 30, according to circumference array, be laid with cylinder hole 31 vertically, in cylinder hole, be respectively equipped with plunger piston slippery boots assembly 40, by the plunger piston slippery boots assembly 40 in each cylinder hole 31, carry out in turn piston movement, the supercharging of realization to liquid, also can realize liquid carrying for the motor of power.In the embodiment of the present invention, realize scheme that plunger piston slippery boots assembly 40 carries out piston movement in turn as shown in Figure 2, between cylinder body 30 and one of them end cap, swash plate 50 is set, one end and swash plate that each plunger piston slippery boots assembly 40 is exposed to outside cylinder hole compress, no longer adopt the scheme driving by return plate in prior art, but plunger piston slippery boots assembly 40 is directly pressed on swash plate 50, make in course of normal operation, plunger piston slippery boots assembly can rotate on swash plate.
Plunger piston slippery boots assembly 40 in the present invention comprises plunger 41 and piston shoes 42, and wherein plunger 41 is arranged in cylinder hole 31, and piston shoes 42 are pressed on swash plate 50, and by ball pivot, is connected between plunger 41 and piston shoes 42.
In order to do piston movement to plunger piston slippery boots assembly 40, provide power, as shown in Figure 2, Figure 3, Figure 4, in the embodiment of the present invention, between each plunger piston slippery boots assembly 40 and the inwall in respective cylinder hole 31, be provided with hydraulic pressure cavity 32, and cylinder body 30 is provided with the intercommunicating pore 33 (shown in Figure 5) that is communicated with hydraulic pressure cavity 32, in hydraulic pressure cavity 32, be filled with liquid, and the set-up mode of hydraulic pressure cavity in the present embodiment, can be so that plunger piston slippery boots assembly hydraulic pressure cavity volume when moving in cylinder hole reduces, and plunger piston slippery boots assembly while moving to swash plate hydraulic pressure cavity volume increase.As shown in Figure 3, when swash plate 50 presses in cylinder hole by plunger piston slippery boots assembly 40, the volume of hydraulic pressure cavity is compressed, because the volume of corresponding hydraulic pressure cavity 32 reduces, so the liquid in corresponding hydraulic pressure cavity flow to other hydraulic pressure cavity by intercommunicating pore 33, fluid pressure in other hydraulic pressure cavity is increased, as shown in Figure 4, other hydraulic pressure cavity realize the increase of hydraulic pressure cavity 32 volumes in the situation that fluid pressure increases, thereby drive corresponding plunger piston slippery boots assembly 40 to move as swash plate 50 directions.Above movement mechanism acts on each plunger piston slippery boots assembly in turn, thereby makes plunger piston slippery boots assembly do piston movement.
Preferably, when the pressure in hydraulic pressure cavity increases, in order can drive plunger slippery boots assembly item swash plate direction to move, as shown in Figure 4, in the embodiment of the present invention, cylinder hole 31 is designed to step hole, the larger one end of this step hole mesoporous is towards swash plate 50, and on plunger piston slippery boots assembly 40, be provided with the step post mating with step hole, it by plunger design, is specifically the step post matching, thereby make to form hydraulic pressure cavity 32 between step on step hole and the step on step post, the other end of cylinder body is provided with space, when pressure increases, this pressure is understood Main Function naturally on the step surface of step post, and promote plunger piston slippery boots assembly 40 to swash plate 50 direction motions.Except adopting the mode of step hole, those skilled in the art can also adopt other modes to realize the setting of hydraulic pressure cavity, as designed corresponding annular aperture in cylinder hole, and on plunger, design corresponding ring-type bar again, and ring-type bar coordinates formation hydraulic pressure cavity with annular aperture.On embodiment of the present invention step post, less one end is positioned at step place and is provided with circular groove, thereby reduces its wearing and tearing.
Preferably, while moving due to the pressure promotion plunger 41 in hydraulic pressure cavity 32, the pressure in hydraulic pressure cavity relevant to Driving force size, what another played a crucial role is the step size on step post, in order to guarantee that Driving force can promote plunger piston slippery boots assembly and move to swash plate direction, can also guarantee that plunger piston slippery boots assembly is to needing the pressurized effect of pressurized liquid simultaneously, need to guarantee the minimum face area of front end promotion supercharging on step post simultaneously, and the appear on the stage size design of terrace of step post, designer of the present invention is by repeatedly designing, recruitment evaluation repeatedly, finally think on step post that the face area of maximum cylinder and the face area of minimum cylinder ratio are designed at 1.15 to 1.75 o'clock, corresponding effect is best, also can be by the Volume design optimization of plunger piston slippery boots.Generally, when on step post, the diameter of maximum cylinder is larger, above-mentioned Area Ratio can be selected less design parameter, and while being greater than 24mm as the diameter at maximum cylinder, above-mentioned Area Ratio now can be selected 1.15 to 1.5 left and right; And on step post the diameter of maximum cylinder hour, above-mentioned Area Ratio needs to select larger design parameter, while being less than 24mm as the diameter at maximum cylinder, above-mentioned Area Ratio now can select 1.4 to 1.75; Adopt the selection mode of above-mentioned Area Ratio can either guarantee Driving force, can guarantee pressurized effect again, can also guarantee that plunger piston slippery boots assembly is unlikely to too heavy.
Preferably, step hole in the embodiment of the present invention selects one-level step hole just can realize its technical purpose, in order to guarantee Driving force, the embodiment of the present invention can also be designed to step hole at least step hole of two-stage, as what adopt in Fig. 6, is exactly two-stage step hole and corresponding two-stage step post.
Preferably, as Fig. 2, Fig. 3, shown in Fig. 4, the embodiment of the present invention is also provided with Sealing 34 between the axial sides of described step hole and plunger piston slippery boots assembly 40, by Sealing 34, will make liquid in hydraulic pressure cavity 32 be difficult for revealing, certainly because oil hydraulic pump provided by the invention is mainly used under hyperbaric environment, hydraulic pressure cavity and the extraneous circulation that more or less there will be some liquid, in order to guarantee that hydraulic pressure cavity 32 can press to swash plate by plunger piston slippery boots assembly, sealability in the embodiment of the present invention adopts following scheme: the step hole of close swash plate 50 one end and the sealing between plunger piston slippery boots assembly are higher than the one end away from swash plate, make to be difficult for revealing near swash plate 50 one end, and away from swash plate one end, in general pressure is larger, so the internal pressure leakage of hydraulic pressure cavity will be less, even cause leakage because pressure is excessive, also there will be liquid outside hydraulic pressure cavity to hydraulic pressure cavity internal leakage, thereby the liquid in hydraulic pressure cavity is played to supplementary function, thereby the pressure in hydraulic pressure cavity can be acted on plunger piston slippery boots assembly 40 better.Certainly, due to hydraulic pressure cavity and the extraneous circulation that more or less there will be some liquid, for guaranteeing can be to needing the liquid of supercharging to occur polluting, the liquid of filling in embodiment of the present invention hydraulic pressure cavity needs the liquid of supercharging identical with cylinder hole; As we apply to desalination of sea water field by oil hydraulic pump provided by the invention, in hydraulic pressure cavity, can fill seawater and also can fill fresh water, filling seawater or fresh water can be to needing the seawater of supercharging to pollute.
Preferably, because plunger is being done piston movement always, in order to prevent that Sealing from coming off, as shown in Figure 3, the embodiment of the present invention is provided with the flange 35 that the step end face with step hole interlocks on Sealing 34, by flange 35, is buckled on step surface, makes Sealing be difficult for deviating from from cylinder hole.
Preferably, oil hydraulic pump provided by the invention can adopt but be not limited to following scheme:
The first, as shown in Figure 2, swash plate 50 is fixedly connected with end cap 10 and without relative movement, plunger piston slippery boots assembly moves in a circle when doing piston movement in cylinder hole on swash plate, namely by rotating shaft 60, drives cylinder body 30 to rotate, and swash plate 50 is fixed on end cap and does not rotate.
The second, cylinder body is fixed on shell, by rotating shaft, drives swash plate to rotate, under the rotation of swash plate, successively plunger piston slippery boots assembly is pressed in cylinder hole.
Preferably, because the liquid in hydraulic pressure cavity can leak out, in order to guarantee that liquid can overall circulation, as shown in Figure 9, in the embodiment of the present invention, between cylinder body 30 and another end cap 10, be provided with successively thrust button 70 and thrust plate 75, thrust button 70 and thrust plate 75 are provided with liquid inlet 71, between thrust button 70 and thrust plate 75, be provided with the communication gap 72 that is positioned at 71 places, liquid inlet, and be provided with communicating passage 36 between cylinder body 30 outer side walls and housing 20, cylinder body is communicated with liquid inlet 17 by described communicating passage 36 and communication gap 72 with the cavity between swash plate, thereby the liquid that makes to leak out can be got back to liquid inlet by above-mentioned connection position and locate, when not using oil hydraulic pump, liquid all can be discharged.
Preferably, communicating passage 36 is set between above-mentioned cylinder body outer side wall and housing and can be distributed in discontinuously between cylinder body 30 outer side walls and housing 20, as, on cylinder body 30 outer side walls, some communication groove are set discontinuously.
Embodiment two
The embodiment of the present invention provides a kind of wear-resistant axial plunger type hydraulic pump, this oil hydraulic pump saves return plate, and by corresponding scheme, reduce the wearing and tearing of plunger piston slippery boots assembly, specifically as shown in Figure 2, this axial plunger type hydraulic pump comprises two end caps 10 and housing 20, end cap 10 and housing 20 form the shell of this oil hydraulic pump, and be provided with through hole in housing 20, in this through hole, be provided with the cylinder body 30 between two end caps 10, on described cylinder body 30, according to circumference array, be laid with cylinder hole 31 vertically, in cylinder hole 31, be respectively equipped with plunger piston slippery boots assembly 40, by the plunger piston slippery boots assembly in each cylinder hole, carry out in turn piston movement, the supercharging of realization to liquid, also can realize liquid carrying for the motor of power.In the embodiment of the present invention, realize scheme that plunger piston slippery boots assembly carries out piston movement in turn as shown in Figure 2, between cylinder body 30 and one of them end cap 10, swash plate 50 is set, one end and swash plate 50 that each plunger piston slippery boots assembly 40 is exposed to outside cylinder hole compress, no longer adopt the scheme driving by return plate in prior art, but plunger piston slippery boots assembly is directly pressed on swash plate, make in course of normal operation, plunger piston slippery boots assembly can rotate on swash plate.
In order to reduce the wearing and tearing of plunger piston slippery boots assembly, as shown in Figure 2, the embodiment of the present invention is provided with backhaul circle 90 between swash plate and cylinder body, in oil hydraulic pump course of normal operation, this backhaul circle 90 does not directly contact with plunger piston slippery boots assembly 40, only that plunger piston slippery boots assembly 40 is shielded, as shown in Figure 2 and Figure 7, described backhaul circle 90 comprises ring-type damper portion 91, described ring-type damper portion 91 is near the motion circumferential surface in whole plunger piston slippery boots assemblies outside, and and be provided with fluid gap between the outer side surface of plunger piston slippery boots assembly, particularly, because plunger piston slippery boots assembly moves in a circle along swash plate, circumferential surface arranged outside at this circular movement has ring-type damper portion 91, and be provided with first fluid gap 92 between ring-type damper portion 91 and each plunger piston slippery boots assembly, owing to being filled with fluid in first fluid gap 92 in hydraulic pump works process, in the process of plunger piston slippery boots assembly 40 High Rotation Speeds, fluid in first fluid gap 92 produces centripetal force to plunger piston slippery boots assembly, can offset the centrifugal force of most plunger piston slippery boots assembly 40, thereby reduce the wearing and tearing that plunger piston slippery boots assembly brings because of centrifugal force.And, owing to directly contacting between ring-type damper portion 91 and plunger piston slippery boots assembly, but produce respective action power by fluid, can reduce like this active force of plunger piston slippery boots assembly, reduce its wearing and tearing.
The embodiment of the present invention does not need filling liquid in fluid gap specially, oil hydraulic pump in the course of the work, liquid can flow in the cavity between swash plate and cylinder body, the explanation of concrete circulation path in can reference example one, repeat no more herein, liquid in cavity enters fluid gap and the plunger piston slippery boots assembly of motion is produced to centripetal force, thereby plays the above-mentioned effect reducing wear.
The driving mode that in the embodiment of the present invention, plunger piston slippery boots assembly is realized piston movement can adopt a kind of scheme of embodiment, no longer describes in detail herein, and those skilled in the art also can expect other drive schemes certainly.
As shown in Figure 2 and Figure 7, plunger piston slippery boots assembly comprises the slide part compressing with swash plate, general plunger piston slippery boots assembly 40 comprises plunger 41 and piston shoes 42, and slide part is arranged on piston shoes 42, the slide part that ring-type damper portion 92 in the embodiment of the present invention arranges forms the outside of motion circumferential surface, makes to form first fluid gap 92 between ring-type damper portion and the motion circumferential surface in whole slide parts outside.
Owing to adopting the mode drive plunger slippery boots assembly of hydraulic pressure cavity, do piston movement, in the long-time idle situation of oil hydraulic pump, liquid in hydraulic pressure cavity may leak, cause doing piston movement by drive plunger slippery boots assembly, in order to drive plunger piston slippery boots assembly to do piston movement when oil hydraulic pump just starts, as shown in Figure 2 and Figure 7, backhaul circle 90 in the embodiment of the present invention also comprises startup supporting portion 93, start between supporting portion 93 and swash plate 50 and form guiding groove 94, on described plunger piston slippery boots assembly 40, correspondence is provided with upper saw pulley 43, upper saw pulley operated by rotary motion is on piston shoes 42, and upper saw pulley 43 is in the interior motion of guiding groove 94, at the beginning of starting, upper saw pulley 43 is conflicted and is being started on supporting portion 93, thereby drive plunger slippery boots assembly 40 moves along swash plate 50, form the piston movement of plunger 41 in cylinder hole 31, after starting a period of time, hydraulic pressure cavity 32 is interior can fill full liquid, thereby no longer need to conflict, starting supporting portion.So; the embodiment of the present invention, when design, becomes to be greater than the thickness of upper saw pulley 43 by the width design of guiding groove 94, make to fill in full liquid situation in hydraulic pressure cavity; starting supporting portion 93 does not need upper saw pulley 43 to support, thereby plays the effect of protection backhaul circle 90.
In order to protect better plunger piston slippery boots assembly not to be worn; in the embodiment of the present invention, be also provided with second fluid gap; concrete set-up mode is as shown in Fig. 2, Fig. 3, Fig. 7; plunger piston slippery boots assembly is provided with the neck 44 being connected with upper saw pulley 43; described startup supporting portion 93 is near the motion circumferential surface in neck outside; start between supporting portion 93 and the motion circumferential surface in neck 44 outsides and form second fluid gap 95, be equivalent to start the effect that supporting portion has been played a part of ring-type damper portion herein.Thus, the fluid in first fluid gap 92 is that the outside of upper saw pulley is produced to centripetal force, and the fluid in second fluid gap 95 is that neck outside is produced to centripetal force, reduces the wearing and tearing of plunger piston slippery boots assembly by above-mentioned two position centripetal force.
In order to protect upper saw pulley, the embodiment of the present invention is designed to be less than first fluid gap 92 by second fluid gap 95, makes fluid can act preferentially on neck, reduces the wearing and tearing of upper saw pulley.In general, the size in first fluid gap and second fluid gap all needs to be less than 1mm.
For convenient, install, the backhaul circle of the embodiment of the present invention is provided with assembly department, by assembly department, backhaul circle is arranged between cylinder body and swash plate, concrete but be not limited to following scheme:
The first, as shown in Figure 2 and Figure 7, backhaul circle 90 also comprises the first assembly department 96 extending to form towards the end face of swash plate from ring-type damper portion 91, and described the first assembly department 96 is fixed between swash plate 50 and shell 20.
The second, as shown in Figure 2 and Figure 7, backhaul circle 90 also comprises that the second assembly department 97, the second assembly departments 97 that extend to form towards the end face of cylinder body from ring-type damper portion 91 are fixed between swash plate 50 and cylinder body 30.
Above the first assembly department 96 and the second assembly department 97 can arrange simultaneously, have the backhaul coil structures of above-mentioned ring-type damper portion, startup supporting portion, the first assembly department, the second assembly department as shown in Figure 7.Because ring-type damper portion and startup supporting portion all need to produce corresponding friction, the backhaul circle that the embodiment of the present invention provides can adopt but be not limited to PEEK (polyether-ether-ketone) material or PA6 (nylon 6) material or POM (polyoxymethylene) material and make, improve its rub proofness, extend backhaul circle working life.
Embodiment three
Oil hydraulic pump of the prior art, because return plate and ball pivot take the larger space of oil hydraulic pump inside, cause the whole manufacture of oil hydraulic pump volume larger, the embodiment of the present invention provides a kind of compact type axial plunger type hydraulic pump, specifically as shown in Figure 2, this axial plunger type hydraulic pump comprises two end caps 10 and housing 20, end cap 10 and housing 20 form the shell of this oil hydraulic pump, and in housing, be provided with through hole, in this through hole, be provided with the cylinder body 30 between two end caps, on described cylinder body 30, according to circumference array, be laid with cylinder hole 31 vertically, in cylinder hole 31, be respectively equipped with plunger piston slippery boots assembly 40, by the plunger piston slippery boots assembly 40 in each cylinder hole, carry out in turn piston movement, the supercharging of realization to liquid, also can realize liquid carrying for the motor of power.
The scheme that the backhaul scheme of the plunger piston slippery boots assembly in the embodiment of the present invention can adopt embodiment one and embodiment two to provide, adopts hydraulic pressure cavity to carry out hydraulic pressure backhaul, and adopts backhaul circle to reduce wear, and specifically repeats no more.
In order to reduce the design length of oil hydraulic pump, in the embodiment of the present invention, each plunger piston slippery boots assembly is exposed to one end outside cylinder hole directly and swash plate 50 compresses, can save return plate and ball pivot, because ball pivot is mounted in rotating shaft, so can shorten the design length of rotating shaft, thereby the design length that reduces oil hydraulic pump, in order to guarantee that the liquid between swash plate and cylinder body can not leak, the embodiment of the present invention is provided with mechanical sealing assembly 80 on the outer side surface near cylinder body 30 in rotating shaft 60.
Mechanical sealing assembly in the embodiment of the present invention can adopt structure conventional in prior art, specifically need to accomplish the circumferential surface realization sealing of mechanical sealing assembly and rotating shaft 60, and need to seal with end cap or swash plate, guarantee that liquid can not leak from penetrating hole of rotating shaft.
The embodiment of the present invention, owing to not adopting ball pivot, can be arranged on mechanical sealing assembly on the outer side surface of rotating shaft near antibody, reduces taking of rotating shaft entire length, shortens the design length of oil hydraulic pump.
In the embodiment of the present invention, without the scheme of return plate and ball pivot, go for the oil hydraulic pump of following two kinds of forms:
The first, as shown in Figure 2, swash plate 50 is fixedly connected with end cap 10 and without relative movement, plunger piston slippery boots assembly 40 moves in a circle when doing piston movement in cylinder hole 31 on swash plate, namely by rotating shaft 60, drives cylinder body 30 to rotate, and swash plate 50 is fixed on end cap 10 and does not rotate.
The second, cylinder body is fixed on shell, by rotating shaft, drives swash plate to rotate, under the rotation of swash plate, successively plunger piston slippery boots assembly is pressed in cylinder hole.
In the embodiment of the present invention, mechanical sealing assembly, near one end of cylinder body except sealing with rotating shaft outer side surface, also needs following at least one sealing configuration:
One, the other end of mechanical sealing assembly and end cap 10 sealings, be equivalent to end cap 10 and be provided with the installation step matching with mechanical sealing assembly, seals, in case liquid leaks from end caps by installation step and mechanical sealing assembly.
Two, as shown in Figure 2 and Figure 8, the mechanical sealing assembly the other end and swash plate sealing, in figure, on swash plate 50, be located at the installation step matching with mechanical sealing assembly, by the installation step on swash plate and mechanical sealing assembly, seal, also can prevent that liquid from leaking from end caps.
When adopting above-mentioned the second encapsulation scheme, in order further to reduce the length of oil hydraulic pump, the embodiment of the present invention is provided with the through hole 11 passing for rotating shaft 60 on end cap 10, and rotating shaft 0 is connected with connector through the part of passing through, described through hole 11 is greater than the maximum outside diameter of connector, and is installed with at least part of described connector, thereby at least a portion of connector can be received in the through hole 11 of end cap, thereby the entire length that reduces oil hydraulic pump, makes oil hydraulic pump compacter.
In the embodiment of the present invention, mechanical sealing assembly can adopt following scheme near the mounting type of cylinder body one end: one, by mechanical sealing assembly 80, the one end near cylinder body is directly pressed on the end face of cylinder body 30, specifically as shown in Figure 8; Two, in rotating shaft, near cylinder body end face outside, be provided with the shaft shoulder, the one end by mechanical sealing assembly near cylinder body is pressed on the shaft shoulder, and in order to shorten design of hydraulic pump length, the embodiment of the present invention can compress setting by the end face of the shaft shoulder and cylinder body.
In order to reduce the thickness of shell, the embodiment of the present invention is connected with housing 20 end cap 10 by screw thread spinner, specifically as shown in Figure 2, rather than the bolt in employing Fig. 1 connects, do not have like this in the situation of bolt hole, do not need blocked up by housing design, reduce the design thickness of housing, thereby make oil hydraulic pump compacter.
As shown in Figure 8, in the embodiment of the present invention, mechanical sealing assembly 80 comprises axial seal 81, the first assembling set 82, the second assembling set 83, axially sealing of axial seal 81 countershafts, the first assembling set 82 and the second assembling set 83 are assemblied on axial seal successively, and between the second assembling set 83 and end cap or swash plate, be provided with O RunddichtringO 84, the through hole by 84 pairs of end caps of O RunddichtringO or swash plate seals.
The embodiment of the present invention is mainly used in various oil hydraulic pumps, especially in the oil hydraulic pump of fully water lubricating.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. a wear-resistant axial plunger type hydraulic pump, comprise the shell that two end caps and the housing with through hole form, in described through hole, be provided with cylinder body, between cylinder body and one of them end cap, be provided with swash plate, on described cylinder body, be laid with cylinder hole vertically according to circumference array, cylinder is respectively equipped with plunger piston slippery boots assembly in hole; It is characterized in that, one end and swash plate that each plunger piston slippery boots assembly is exposed to outside cylinder hole compress, between swash plate and cylinder body, be provided with backhaul circle, described backhaul circle comprises ring-type damper portion, described ring-type damper portion is near the motion circumferential surface in whole plunger piston slippery boots assemblies outside, and and the outer side surface of plunger piston slippery boots assembly between be provided with first fluid gap.
2. the axial plunger type hydraulic pump of hydraulic pressure backhaul according to claim 1, it is characterized in that, described plunger piston slippery boots assembly comprises the slide part compressing with swash plate, and described fluid gap comprises the first fluid gap forming between ring-type damper portion and the motion circumferential surface in whole slide parts outside.
3. the axial plunger type hydraulic pump of hydraulic pressure backhaul according to claim 1 and 2, it is characterized in that, described backhaul circle also comprises startup supporting portion, starts between supporting portion and swash plate and forms guiding groove, on described plunger piston slippery boots assembly, correspondence is provided with upper saw pulley, and upper saw pulley moves in guiding groove.
4. the axial plunger type hydraulic pump of hydraulic pressure backhaul according to claim 3, is characterized in that, the width of described guiding groove is greater than the thickness of upper saw pulley.
5. the axial plunger type hydraulic pump of hydraulic pressure backhaul according to claim 3, it is characterized in that, described plunger piston slippery boots assembly is provided with the neck being connected with upper saw pulley, described startup supporting portion is near the motion circumferential surface in neck outside, and described fluid gap comprises the second fluid gap forming between startup supporting portion and the motion circumferential surface in neck outside.
6. the axial plunger type hydraulic pump of hydraulic pressure backhaul according to claim 5, it is characterized in that, described oil hydraulic pump is filled with liquid in the cavity between swash plate and cylinder body in the course of the work, and described liquid enters first fluid gap and second fluid gap and the plunger piston slippery boots assembly of motion is produced to centripetal force.
7. the axial plunger type hydraulic pump of hydraulic pressure backhaul according to claim 6, is characterized in that, described second fluid gap is less than first fluid gap.
8. the axial plunger type hydraulic pump of hydraulic pressure backhaul according to claim 1 and 2, is characterized in that:
Described backhaul circle also comprises the first assembly department extending to form towards the end face of swash plate from ring-type damper portion, and described the first assembly department is fixed between swash plate and shell; And/or
Described backhaul circle also comprises the second assembly department extending to form towards the end face of cylinder body from ring-type damper portion, and the second assembly department is fixed between swash plate and cylinder body.
9. the axial plunger type hydraulic pump of hydraulic pressure backhaul according to claim 1 and 2, it is characterized in that, between the inwall in each plunger piston slippery boots assembly and respective cylinder hole, be provided with hydraulic pressure cavity, cylinder body is provided with the intercommunicating pore that is communicated with hydraulic pressure cavity, described plunger piston slippery boots assembly hydraulic pressure cavity volume when moving in cylinder hole reduces, and when described plunger piston slippery boots assembly moves to swash plate, hydraulic pressure cavity volume increases.
10. the axial plunger type hydraulic pump of hydraulic pressure backhaul according to claim 1 and 2, is characterized in that, described backhaul circle adopts PEEK or PA6 or POM material to make.
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| CN201410357510.4A CN104100482B (en) | 2014-07-21 | 2014-07-21 | Wear-resistant axial plunger type hydraulic pump |
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| CN201410357510.4A CN104100482B (en) | 2014-07-21 | 2014-07-21 | Wear-resistant axial plunger type hydraulic pump |
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| CN104100482B CN104100482B (en) | 2017-01-18 |
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| CN105257493A (en) * | 2015-10-23 | 2016-01-20 | 北京航科发动机控制系统科技有限公司 | Device for reducing comprehensive function of surface contact force and linear velocity of sliding shoe |
| WO2016011898A1 (en) * | 2014-07-21 | 2016-01-28 | 沃尔科技有限公司 | Axial plunger type hydraulic pump |
| CN115013280A (en) * | 2022-07-26 | 2022-09-06 | 绩溪山合机械有限公司 | Hydraulic pump accessory bearing reversing shaft |
| CN115234461A (en) * | 2022-07-22 | 2022-10-25 | 中航力源液压股份有限公司 | Gear disc and spherical hinge antifriction mechanism of aviation hydraulic pump |
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| CN115234461B (en) * | 2022-07-22 | 2023-11-24 | 中航力源液压股份有限公司 | Gear disc and spherical hinge antifriction mechanism of aviation hydraulic pump |
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| CN115013280B (en) * | 2022-07-26 | 2023-12-05 | 绩溪山合机械有限公司 | Bearing reversing shaft of hydraulic pump accessory |
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| CN104100482B (en) | 2017-01-18 |
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