CN103958893B - Hydrostatic piston engine - Google Patents
Hydrostatic piston engine Download PDFInfo
- Publication number
- CN103958893B CN103958893B CN201280058300.4A CN201280058300A CN103958893B CN 103958893 B CN103958893 B CN 103958893B CN 201280058300 A CN201280058300 A CN 201280058300A CN 103958893 B CN103958893 B CN 103958893B
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- opening
- mouth
- plunger cavity
- piston engine
- pressure
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- 230000002706 hydrostatic effect Effects 0.000 title claims abstract description 9
- 230000007704 transition Effects 0.000 claims abstract description 54
- 238000003860 storage Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 10
- 210000003734 kidney Anatomy 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 210000004373 mandible Anatomy 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
- F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2042—Valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/08—Pressure difference over a throttle
Abstract
Disclosing a kind of hydrostatic piston engine, particularly axial piston engine, it has multiple plunger cavity, and plunger is implemented to move back and forth in described plunger cavity.Here, corresponding plunger cavity alternately can be connected with low-pressure opening and high pressure opening respectively by controlling opening.Being provided with transition region between low-pressure opening and high pressure opening, corresponding plunger cavity is by moving in described transition region transition part between low-pressure opening and high pressure opening.Being provided with mouth in corresponding transition region, when described in running at piston engine, the control opening of plunger cavity intersects with mouth, corresponding plunger cavity can be by described mouth and memory element, be particularly connected with precommpression volume.
Description
Technical field
The present invention relates to a kind of hydrostatic piston engine, particularly axial piston engine.
Background technology
Disclosing a kind of such piston engine at DE 42 29 544 A1, this piston engine is axial piston engine.This post
Plug facility have the cylinder body arranged on the driving shaft, and described cylinder body has multiple plunger cavity, and each plunger is described
Plunger cavity is directed to movingly.Corresponding plunger cavity can be respectively by processing the control in the end face of cylinder body
Opening processed is alternately connected with low-pressure opening and the high pressure opening of the kidney shape processed in control dish.Be in operation cylinder
Body slides on the end face of control dish.Low-pressure opening and high pressure opening are positioned at common part to be justified above and in circumference
It is spaced apart from each other on direction, thus constitutes two transition regions.In this transition region one of corresponding plunger
In be in the region of its bottom dead centre or lower dead center Bottom Dead Center (BDC) and at this transition region
In another in be in the region of its top dead-centre or top dead centre Top Dead Center (TDC).One has
The passage of passage mouth leads in this transition region that (corresponding plunger is in this transition region in this transition region
BDC at), described passage mouth is connected with precommpression volume (PCV).PCV is by guiding valve and throttling dress
Putting and be connected with high pressure opening, thus PCV can be supplied to high pressure and lead to lentamente in the case of guiding valve is opened
Cross throttling arrangement to load.Seeing in radial directions, the passage in transition region is at low-pressure opening and high pressure opening
Maximum gauge outside be passed through.The control opening of corresponding plunger cavity has cutout portion, and this cutout portion is same
Being positioned at outside the maximum gauge of low-pressure opening and high pressure opening, therefore controlling opening can intersect with described passage.
When cylinder body is relative to control dish relative movement, the control opening of corresponding plunger cavity is inswept has passage mouth
The transition region in portion, is therefore existed with storage device by this passage by the working chamber of plunger cavity and plunger limited boundary
Connect during the time of contact determined and pressure in working chamber is rapidly close to the pressure of PCV, and PCV
Slowly through throttling and valve control, towards high pressure opening connection load high pressure.Therefore working chamber with height
Pressing off before mouth connects and be loaded the hydraulic medium being under the pressure determined, this causes the hydraulic medium of piston engine
The reduction of fluctuation.The reason of hydraulic medium fluctuation is, paramount from low-pressure opening transfer at the plunger cavity of piston engine
Pressure differential is must pull against when pressing off mouthful.This except hydraulic medium fluctuate in addition to also result in vibration, noise generation and
The damage caused due to cavitation.
Described solution has the drawback that, in order to increase pressure, the hydraulic medium of high pressure opening is supplied work
Making chamber, this causes additional energy charge.The most this piston engine has relatively low efficiency.Additionally due to
Carrying out throttling arrangement and the valve of hydraulic medium connection between high pressure opening and PCV, this piston engine is in device skill
In art, structure gets up to spend high.
Publication DE 10 2,008 061 349 A1 illustrates another reality of the piston engine of the form with axial piston engine
Execute mode.Here, same setting has the low-pressure opening of the kidney shape and the control dish of high pressure opening.There is passage mouth
The passage in portion leads in the corresponding transition region between low-pressure opening and high pressure opening respectively.Lead to transition region
In passage can be connected with high pressure opening or PCV by control valve, axial piston engine in this transition region
The corresponding plunger of cylinder body is in the region of its BDC.The passage leading to other transition region passes through control valve
It is connected with low-pressure opening or PCV.It is different from aforesaid solution ground, attainable by this layout,
PCV is supplied to or on-load pressure not only by high pressure opening, and also by by corresponding plunger limited boundary
The pressure of working chamber supplies or loads.To this end, the corresponding working chamber of cylinder body is opened in the control of this working chamber
The inswept transition region of mouth (in this transition region in the region of the TDC that corresponding plunger is in this transition region)
Time be connected with PCV by leading to the passage in transition region and control valve, and PCV and other transition region
Between the described other control valve that connects through interrupt.Therefore mild pressure is achieved by these passages
Increase and pressure reduces, hence improve the noise situations of piston engine.
The shortcoming of this solution is to have multiple hydraulic medium pipeline and two for controlling the valve of PCV
Piston engine on device technique, spend high structure.
Summary of the invention
On the other hand, it is an object of the invention to propose a kind of piston engine (or piston machine) eliminating described shortcoming.
This purpose is realized by the hydrostatic piston engine according to the present invention.
According to the present invention, hydrostatic piston engine, particularly axial piston engine have multiple plunger cavity, at described post
Plug chamber is respectively provided with one and can implement reciprocating plunger.Corresponding plunger cavity is by controlling opening alternately
Being connected with the low-pressure opening controlling parts and high pressure opening, described control parts can be control dish.Low-pressure opening
Separated from one another by two transition regions with high pressure opening, described transition region is particularly located substantially at plunger
In the region of corresponding dead-centre position.In corresponding transition region, be respectively provided with a mouth, this mouth with deposit
Storage element (pressure compensating volumes Pressure Recuperation Volume (PRV)) connects.It is arranged so as at this
The control opening of mouth, low-pressure opening and high pressure opening and plunger cavity so that PRV is by when using piston engine
The plunger cavity moving to low-pressure opening from high pressure opening loads, and PRV loads and moves to height from low-pressure opening
Press off the plunger cavity of mouth.
This solution has the advantage, that and is different from prior art ground, it is not necessary to additional valve and a large amount of
For the plunger cavity in PRV and transition region is carried out pressure controlled hydraulic fluid passage, thus in device skill
Construct this piston engine in art extremely simplely and inexpensively.Additionally, storage device is advantageous by warp
The plunger cavity being moved to low-pressure opening from high pressure opening by transition region loads.Then, at the pressure of plunger cavity
Before reducing via low-pressure opening, the pressure energy of this plunger cavity loads PRV.There is no need for PRV
The additional-energy loaded, thus piston engine has relatively high efficiency.
Advantageously, plunger and plunger cavity limit the border of dead center volume jointly, and this dead center volume is significantly less than PRV
Storage volume or reclaim volume.Therefore it is substantially provide for by the plunger cavity in PRV supply transition region
Hydraulic medium.Additionally, be the most also relative in the pressure decline with PRV when the plunger cavity being loaded connects
Low.
Show it is particularly advantageous that store volume to be at least about 7.5 times of dead center volume.
In another structural scheme of the present invention, control opening, low-pressure opening and high pressure opening and mouth quilt
Construct as follows so that when plunger cavity connects with corresponding mouth, corresponding control opening not with low pressure
Opening and high pressure opening connect, and thus avoid causing energy loss between low-pressure opening or high pressure opening and PRV
Connection.Therefore PRV is only connected with plunger cavity formation hydraulic medium.
Here, described mouth can have the most different opening transverse incisions.Here, described mouth has
At the length different relative in the circumferential direction of rotation axis and/or the most different width.Therefore
Substantially determine that corresponding mouth is with corresponding by the length in circumferential direction of the most slot-shaped mouth
Time of contact between control opening, and between corresponding mouth and corresponding control opening in radial directions
Crossing width determine the hydraulic medium volume flow between memory element and plunger cavity.
Here, described mouth and/or control opening are preferably constructed as follows so that in storage when crossing
Exchange between element and plunger cavity one due to PRV and the volume of plunger cavity the hydraulic medium volume of maximum possible
Flow, therefore can realize the energy regenerating of maximum.
The most particularly be so designed that mouth and/or control opening so that control opening no longer with low-pressure opening or
After high pressure opening connects, corresponding mouth is connected with plunger cavity as early as possible.
In another structural scheme of the present invention, when the pressure in memory element and the plunger cavity that is connected with mouth
In pressure almost equal time, the most described mouth and the connection controlled between opening.
From the rotation axis of piston engine in the radial direction, described mouth is preferably at low-pressure opening and/or high pressure
Constructing outside the maximum outside diameter of opening in controlling parts, wherein, low-pressure opening and/or high pressure opening have substantially
Constant external diameter.In addition the opening that controls of plunger cavity has the cutout portion being similarly positioned in outside described external diameter.Cause
This, at mouth with in terms of the time of contact controlled when opening intersects, design mouth the most neatly and control opening
Geometry and PRV and corresponding plunger cavity between the size of hydraulic medium volume flow.Open in control
Observing in the circumferential direction around rotation axis of mouth, cutout portion can construct and control the about middle of opening
Place and particularly there is u shape.The most advantageously, described cutout portion compares in the circumferential direction controlling opening
Control opening much shorter.
In order to increase the intersecting area controlled between opening and mouth, described mouth is configured to slot-shaped and at this
Extend the most in circumferential direction relative to rotation axis.
Additionally or alternatively, mouth can construct the bearing holder (housing, cover) of the sliding bearing at the cylinder body with plunger cavity
In.Corresponding plunger cavity then also has, in addition to controlling opening, other controls that can be alternately connected with mouth and opens
Mouth or conversion opening.This solution this have the advantage that, described other control opening or conversion opening due to structure
Making in other components rather than in control dish can be substantially independent of intersecting with low-pressure opening and high pressure opening
Control opening ground to construct.
Preferably, corresponding conversion opening is arranged in cylinder body in radial directions.
Accompanying drawing explanation
The preferred embodiment of the present invention is described in detail below according to accompanying drawing.
In accompanying drawing:
Fig. 1 illustrates the control dish of the piston engine according to the present invention according to first embodiment with top view,
Fig. 2 illustrates the cylinder body of the piston engine according to first embodiment with upward view,
Fig. 3 illustrates the Local map schematically shown of the control dish of the piston engine according to first embodiment,
Figure 4 and 5 are shown respectively the sketch of the different parameters with the piston engine according to first embodiment, and
Fig. 6 illustrates the piston engine according to the second embodiment with schematic sketch.
Detailed description of the invention
In FIG in order to illustrate that the hydrostatic piston engine according to the present invention shows to control dish 1 with top view
The control parts of form.Described piston engine is axial plunger pump.The basic structure of axial plunger pump is by existing
Technology is the openest, can omit the most below and illustrate completely.
Control dish 1 has the low-pressure opening 2 of the kidney shape and the high pressure opening 4 of the kidney shape, and this high pressure opening is used for by two
The contact pin 6 mechanically improving intensity is divided into three essentially identical sections.Low pressure-and high pressure opening 2 and 4 along
Common round section ground extends.Control dish 1 is configured to ring-type and have circle at center space 8, axial columns
The drive shaft of plug pump can pass this space.Low-pressure opening 2 is connected with low-voltage interface and high pressure opening 4 and axle
Connect to the high voltage interface of plunger displacement pump.
The cylinder body 10 of axial plunger pump is shown with upward view in fig. 2.When axial plunger pump operation, this cylinder body
Its side 12 is utilized to slide on the sliding surface 14 of the control dish 1 of Fig. 1.Multiple control openings 16 lead to described
In side 12, these control opening and are respectively configured to the kidney shape and extend along a common round section.?
This, corresponding control opening 16 with unshowned, turning up the soil relative to the rotation axis parallel interval of cylinder body 10 sets
The plunger cavity put connects, and plunger is directed to movably in described plunger cavity and defines the border of working chamber.
In piston engine runs, with low-pressure opening 2 in control opening 16 anticlockwise rotation direction in FIG
Alternately connect with high pressure opening 4.It is achieved in that the reciprocating motion of the plunger being arranged in cylinder body 10 at this, makes
Obtain this plunger in the region of high pressure opening 4, be compressed stroke and take out in the region of low-pressure opening 2
Inhale stroke.
In FIG, in anticlockwise direction of rotation, arrange between low-pressure opening 2 and high pressure opening 4
First transition region 18 and the second transition region 20 is set between high pressure opening 4 and low-pressure opening 2.Here,
These transition regions are positioned at the dead point region of plunger motion.In the first transition region 18, it is outer dead that plunger is in it
In the region of point；And in the second transition region 20, plunger lies within the region at dead point.Therefore described
First transition region 18 is such a transition region, by axial plunger transport pump liquid in this transition region
The control opening 16 in Fig. 2 is carried out from low-pressure opening 2 to the transfer of high pressure opening 4 during pressure medium；And at this
Described second transition region 20 is such a transition region, be controlled in this transition region opening 16 from
High pressure opening 4 is to the transfer of low-pressure opening 2.
Plunger cavity controls to be filled hydraulic medium during opening 16 contacts with low-pressure opening 2 at it, wherein, and plunger
Stress level in chamber is substantially uniform with the stress level of low-pressure opening 2.When contacting with high pressure opening 4, liquid
Pressure medium is expelled from from plunger cavity 16, and here the stress level in plunger cavity is approximately corresponding to high pressure opening
The stress level of 4.In order to when plunger cavity after transition region 18 and 20 with low pressure or high pressure opening 2 or 4
Avoid compression shock during raw contact, in corresponding transition region 18 or 20, a mouth 22 or 24 is arranged and arrive
In control dish 1.Here, corresponding transition region 18 or 22 is by corresponding mouth 22 or 24 and pass through
Hydraulic medium pipeline 26 or 28 is directly connected with memory element 30.Here, memory element 30 adds as space
Work in the cover plate of axial plunger pump, wherein this space can simply together with cover plate with pouring procedure manufacture.
Mouth 22 and 24 schematically shows in FIG and illustrates the most enlargedly.
In fig. 3 it can be seen that mouth 22 and 24 is configured to slot-shaped and along a common round section
Ground extends.In figure 3 in order to an end segments except high pressure opening 4 and low-pressure opening 2 are better described
Two end segments outside schematically show in Fig. 2 control opening 16 several circumferential shape.Described
Mouth 22 and 24 constructs control in FIG outside the maximum outside diameter of described low pressure-and high pressure opening 2 and 4
In dish 1.
Found out by Fig. 3, control opening 16 and have in radial directions and low pressure-and the basic phase of high pressure opening 2,4
With width and along circle extension identical with low pressure-and high pressure opening 2,4.In order to make the control in Fig. 3 open
Mouth 16 and mouth 22,24 intersect when cylinder body 10 rotates, and control opening 16 and additionally have the opening of u shape
Transverse incision 32 (also seeing Fig. 2).Described opening transverse incision is seen in opening 16 in circumferential direction corresponding control
General arrangement in centre and extends radially outward.Here, the length in circumferential direction of this opening transverse incision
Degree is more much smaller than the primary section controlling opening 16.
When the cylinder 10 of Fig. 2 rotates, control opening 16 opening transverse incision 32 (see Fig. 3) and mouth 22 or
24 intersect, and thus set up between the memory element 30 in plunger cavity and Fig. 1 and connect.Gap is so designed at this
The mouth 22 of shape and 24 and the length of opening transverse incision 32 so that at mouth 22 and 24 and opening transverse incision
32 when intersecting, and controls opening 16 and is fully located in the transition region 18 or 20 in Fig. 1 and does not the most exist logical
Toward low pressure-or the connection of high pressure opening 2 or 4.This is in figure 3 by the control opening 16 schematically shown
Illustrate.The control opening 16 on the right illustrates with a position at this in the figure, controls described in this position
Opening processed (this is shown by arrow 34) when cylinder body 10 rotates counterclockwise is directly arranged at low-pressure opening 2
Afterwards, and opening transverse incision 32 be located immediately at the right at this mouth 22 before.Opening 16 is controlled at this
When continuing to rotate counterclockwise, opening transverse incision 32 will intersect with mouth 22.Press off with height controlling opening 16
Before mouth 4 contact, this intersects end.This is equally applicable to the control opening 16 shown in the left side, institute in figure 3
State control opening to be directly in before mouth 24 with its opening transverse incision 32 after high pressure opening 4.Therefore,
When rotating the most counterclockwise, this controls opening 16 and just intersects with dead slot 24 after high pressure opening 4.
Before this control opening 16 contacts with low-pressure opening 2, this intersects end.Therefore memory element 30 basis
Revolving valve principle is connected with plunger cavity.
Below according to the operation principle of the axial plunger pump in machine parameter explanatory diagram 1 to 3, described machine parameter
Illustrate the most in figures 4 and 5.Described chart depict multiple about time s
Curve.The most exemplarily according to different parameters, the process of heightening is shown, corresponding during this is heightened
Plunger cavity low-pressure opening 2 from Fig. 1 arrive high pressure opening 4 through transition region 18, this plunger cavity is at this
Transition region is pre-compressed.Fig. 5 exemplarily illustrates, according to different parameters, the process of turning down, and turns down at this
In journey, corresponding plunger cavity high pressure opening 4 from Fig. 1 arrives low-pressure opening 2 through transition region 20, at this
In transition region, the pressure in plunger cavity reduces and is used for loading described memory element 30.
Lower curve in Fig. 4 36 schematically show at this opening transverse incision 32 in Fig. 3 and mouth 22 it
Between time of contact, the high level of curve 36 means substantially to enter in time of contact between 0.08 and 0.08102
Intersecting of row.
The curve 38 being arranged in about middle in the diagram illustrates the supply flow rate of hydraulic medium qualitatively, described
Hydraulic medium from plunger cavity through being arranged in the opening transverse incision 32 on the right in figure 3, mouth 22 and Fig. 1
Hydraulic medium pipeline 26 arrives memory element 30.This can be seen that, hydraulic medium is only 0.08 to 0.08102
Between time of contact in exchange, wherein said supply flow rate is controlling intersecting between opening 16 and mouth 22
Drastically raise during beginning and the most slowly decline.In the contact controlled between opening 16 and mouth 22 or crossing
Terminating not long ago, supply flow rate is the most substantially zeroed.
Curve 40 and curve 42 illustrate that pressure changes.The numerical value be given on the y axis and the parameter " pressure " be given
It is suitable only for the two curve.
Curve 40 illustrates the change on time of contact of the pressure in plunger cavity.When 0.08 second, i.e. open in control
During crossing beginning between mouthfuls 16 and mouth 22, the pressure in plunger cavity is about zero and then until contact
Time is to be increased to about 110bar when 0.08102 second.After described time of contact, pressure also continues to raise,
Because controlling opening 16 to intersect with the high pressure opening 4 in Fig. 3.Then pressure is increased to about 300 in plunger cavity
Bar, this is corresponding to the pressure in high pressure opening 4.
Curve 42 in the chart of Fig. 4 illustrates the pressure in the memory element 30 in Fig. 1.In memory element 30
Pressure controlling about 130bar before opening 16 intersects with the mouth 22 in Fig. 3 at this.Open in control
After mouthfuls 16 contact with mouth 22, the pressure in memory element 30 declines slightly, and while plunger cavity in
Pressure (see curve 40) steeply rises.Therefore, the pressure of described plunger cavity and the pressure of described memory element 30
Balance each other mutually between described contact.At the end of time of contact, described pressure is in a basic balance about at this
110bar.Pressure in the memory element 30 of Fig. 1 declines the pressure being significantly less than in plunger cavity at this and raises.Its
Reason is, the volume of memory element is significantly greater than by plunger cavity and the working chamber of plunger limited boundary.Show have
Profit, the volume of memory element 30 is at least about 7.5 times of the dead center volume in corresponding plunger cavity.Cause
This memory element 30 being connected with plunger cavity to be loaded is not unloaded completely.
Here, the control opening 16 of cylinder body 10 so constructs and arranges so that only one controls to open every time
Mouth 16 contacts with transition region 18 or 20.This is illustrated by means of the curve 44 in Fig. 4, and this curve is made
Illustrate for straight line.This represents by the supply flow rate of the mouth 24 on the left side in Fig. 3.Because on the right of in figure 3
Control when opening intersects with mouth 22, to control opening 16 to intersect with the mouth 24 on the left side in Fig. 3, institute
With supply flow rate during this time of contact for zero.
Explaining, according to chart in Figure 5, the process of turning down, during this is turned down, the control of plunger cavity is opened
Mouth 16 moves to low-pressure opening 2 from high pressure opening 4 when rotating the most counterclockwise.Here, be shown in tune
The change of the curve 36 to 44 of the Fig. 4 during low.Here, lower curve 36 illustrate opening change and from
And the time of contact between the mouth 24 in the opening transverse incision 32 and Fig. 3 controlling opening 16 is shown, wherein,
About intersect in the time between 0.1002 and 0.1012 second.The supply flow rate heightened is here zero,
This is illustrated by the curve 38 in Fig. 5.Pressure (see curve 40) in plunger cavity is intersecting it with mouth 24
Before be of about 300bar and during time of contact, then fall to approximately 130bar.After intersecting, plunger
Pressure in chamber continues to decline, because the control opening 16 in Fig. 3 intersects with low-pressure opening 2, and thus plunger cavity
In pressure drop to the pressure of low-pressure opening 2.Pressure in plunger cavity declined within time of contact, and stored
In element 30, the pressure (see Fig. 1) raises, and the curve 42 in Fig. 5 illustrates this point.This pressure here from
About 110bar is increased to 130bar, and thus, the pressure in plunger cavity and the pressure in memory element 30 are in institute
It is approximately equivalent at the end of stating time of contact.Therefore, memory element 30 during described time of contact again by with
Hydraulic medium from plunger cavity is filled in, and therefore realizes energy regenerating.Hydraulic medium in plunger cavity thus be accordingly used in
Load to memory element 30 and flow out to low-pressure opening 2 while utilization will not added.Therefore, the efficiency of piston engine
It is relatively high, because the energy loss occurred during turning down is stored and during heightening by memory element 30
Used.
Control opening 16 in Fig. 3 can be regulated by its configuration scheme with the time of contact of mouth 22 or 24.
Here, the effect length time of contact that mouth 22 and 24 is in circumferential direction, wherein in the situation that length is longer
Under correspondingly increase time of contact.In addition the width of intersecting area or mouth 22 and 24 are in radial directions
The width of width and opening transverse incision 32 so selects so that the pressure in described inner plunger time of contact chamber
Balance each other the most mutually with the pressure in memory element 30 (see Fig. 1).It is desirable that when plunger cavity and memory element
Between 30 during pressure balance, difference finishing control opening 16 intersects with mouth 22 or 24.Control opening 16
With intersecting preferably in the phase controlled between opening 16 and low pressure-or high pressure opening 2 or 4 between mouth 22 or 24
Soon carry out after knot bundle.The most so design contact surface so that permissible between plunger cavity and memory element 30
The supply flow rate of exchange maximum possible, this causes the energy regenerating of maximum.Therefore, memory element 30 is according to rotation
Guiding valve principle is connected with plunger cavity.
Fig. 6 illustrates the piston engine of form with the axial plunger pump according to the second embodiment with schematic view.
Being different from aforesaid embodiment ground, mouth 46 and 48 is not to construct in control dish, but structure is at bearing holder (housing, cover)
In 50, cylinder body 52 is slidably mounted in this bearing holder (housing, cover).
Cylinder body 52 is connected with drive shaft 54 regularly, and this drive shaft passes through swivel bearing 56 in its end segments
It is bearing in unshowned casing with 58.Multiple plunger cavities are turned up the soil setting relative to rotation axis 60 parallel interval
In cylinder body 52, figure 6 illustrates upper plug chamber 62 and lower plunger chamber 64.A plunger is at described post respectively
Plug is directed in chamber movingly, figure 6 illustrates the plunger 66 of plunger cavity 62 and the plunger 68 of plunger cavity 64.
Corresponding plunger 66 and 68 is hingedly connected with plunger foot 70 or 72 on the side of its cylinder body 52 dorsad,
When cylinder body 52 rotates, plunger 66 and 68 is slided on swash plate 74 by described plunger foot.
Cylinder body 52 utilizes the outer peripheral face 76 of this cylinder body to be slidably supported in bearing holder (housing, cover) 50.In order to concisely, at figure
In 6, the outer peripheral face 76 of cylinder body 52 and the inner peripheral surface 78 of bearing holder (housing, cover) 50 are substantially spaced to turn up the soil and illustrate.
Upper mouth 46 in Fig. 6 is connected with a memory element or PRV 82 by hydraulic medium pipeline 80, and
Lower mandible portion 48 is connected with PRV 82 by hydraulic medium pipeline 84.Here, mouth 46 and 48 is arranged in plunger
In the transition region of machine.Upper mouth 46 in Fig. 6 is used herein to increase the post between low-pressure opening and high pressure opening
Pressure in plug chamber, and lower mandible portion 48 is for reducing the pressure in the plunger cavity between high pressure opening and low-pressure opening.
This is illustrated by arrow 86 and 88, and this arrow illustrates from or goes to the supply flow rate of PRV 82.Therefore,
One supply flow rate flows to a plunger cavity by upper mouth 46 from PRV 82, and a supply flow rate is by lower mandible portion 48
PRV 82 is flowed to from a plunger cavity.In order to make plunger cavity be connected with mouth 46 and 48, radially at cylinder body 52
In be respectively provided with one other, towards the control opening of corresponding plunger cavity or conversion opening.Here, at Fig. 6
Middle conversion opening 90 leads to plunger cavity 62, and changes opening 92 and lead to plunger cavity 64.
Fig. 6 additionally illustrates cylinder body 52 with top view.Here, it can be seen that multiple columned plunger cavity 94,
Being respectively configured a conversion opening 96 to described plunger cavity, described conversion opening is illustrated by a dotted line.
Fig. 6 illustrates piston engine, in this piston engine, lower plunger 68 be disposed generally on its top dead-centre (English is:
Top Dead Center) region in and upper plug 66 be arranged in its bottom dead centre (English be: Bottom Dead
Center) in region.
In order to make plunger cavity be connected with PRV 82, conversion opening 96 intersects with mouth 46 or 48.To this end,
The side of rotation axis 60 looks up, and conversion opening 96 and mouth 46 or 48 are shown greatly identical height and carried out cloth
Put.Here, mouth 46 and 48 is configured to hole or gap, they section ground are along the circumference side at bearing holder (housing, cover) 50
Circle extension upwards.In order to make plunger cavity 94 be connected, to each plunger cavity with low pressure-and the high pressure opening of piston engine
94 configurations one control openings, and wherein figure 6 illustrates plunger cavity 62 controls opening 98 and plunger cavity 64
Control opening 100.Described control opening is respectively relative to plunger cavity 62 or 64 and the most coaxially extends and lead to
On the side 102 of the swash plate dorsad 74 of cylinder body 52.
Here, the most so design mouth 46,48 and the geometry of conversion opening 96 so that PRV 82
It is loaded corresponding to first embodiment or unloaded.
Disclosing a kind of hydrostatic piston engine, particularly axial piston engine, it has multiple plunger cavity, and plunger exists
Described plunger cavity moves back and forth.Here, corresponding plunger cavity can by control opening respectively with low pressure
Opening and high pressure opening alternately connect.It is provided with transition region, accordingly between low-pressure opening and high pressure opening
Plunger cavity by described transition region transition part between low-pressure opening and high pressure opening moves.Accordingly
Transition region in be provided with mouth, the control opening of this plunger cavity and one of mouth phase in running at piston engine
During friendship, corresponding plunger cavity is connected with memory element (PRV) by described mouth.
Claims (11)
1. a hydrostatic piston engine, has at least one plunger cavity (94), is disposed with in described plunger cavity
Movable plunger (66,68), described plunger cavity (94) can be by controlling opening (98,100) alternately
Ground is connected, in described low-pressure opening (2) with the low-pressure opening (2) controlling parts (1) and high pressure opening (4)
And it is provided with two transition regions (18,20) between described high pressure opening (4), it is characterised in that accordingly
Transition region (18,20) in be provided with the mouth (22,24 for being connected with described plunger cavity；46,48),
Described mouth is respectively by pressure pipeline (26,28；80,84) with memory element (30；82) connect, institute
State mouth (46,48) to construct in there is the bearing holder (housing, cover) (50) of cylinder body (52) of described plunger cavity (94),
And described plunger cavity (94) also has outside described control opening (98,100) can be alternately with described
The additional control opening (90,92) that mouth (46,48) connects.
Piston engine the most according to claim 1, wherein, described additional control opening sets in radial directions
Put in described cylinder body (52).
Piston engine the most according to claim 1 and 2, wherein, is configured with in described plunger cavity (94)
Dead center volume, and described memory element (30；82) dead center volume described in storage volumetric ratio is much bigger.
Piston engine the most according to claim 3, wherein, described storage volume is at least described dead center volume
About 7.5 times.
Piston engine the most according to claim 1 and 2, wherein, described control opening (98,100), institute
State low-pressure opening (2) and high pressure opening (4) and described mouth (22,24；46,48) by with such as lower section
Formula constructs so that at described plunger cavity (94) and corresponding mouth (22,24；46,48) when connecting, phase
The control opening (98,100) answered is not connected with described low-pressure opening (2) and high pressure opening (4).
Piston engine the most according to claim 1 and 2, wherein, it is crosscutting that described mouth has different openings
Mouthful.
Piston engine the most according to claim 1 and 2, wherein, described mouth (22,24；46,48)
Constructed as follows so that at described memory element (30 when crossing；82) and between described plunger cavity
The hydraulic medium volume flow of exchange maximum possible.
Piston engine the most according to claim 1 and 2, wherein, described mouth (22,24；46,48)
And/or described control opening (98,100) designed as follows so that described control opening (98,100)
After being no longer connected with described low-pressure opening (2) or high pressure opening (4), corresponding mouth (22,24；46,
48) it is connected with described plunger cavity (94) as early as possible.
Piston engine the most according to claim 1 and 2, wherein, described mouth and/or described control opening
(98,100) are designed as follows so that when the pressure in described memory element and with described mouth (22,
24；46,48) when the pressure in the plunger cavity (94) connected almost balances, the most described mouth (22,24；
46,48) connection and between described plunger cavity (94).
Piston engine the most according to claim 1 and 2, wherein, described mouth is configured to slot-shaped or long
Shape is poroid and extends in circumferential direction relative to the rotation axis of described piston engine.
11. piston engines according to claim 1 and 2, wherein, described mouth (22,24；46,48)
It is respectively provided with different opening transverse incisions.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011117081.6 | 2011-10-27 | ||
| DE201110117081 DE102011117081A1 (en) | 2011-10-27 | 2011-10-27 | Hydrostatic piston machine |
| PCT/EP2012/070103 WO2013060576A1 (en) | 2011-10-27 | 2012-10-11 | Hydrostatic piston machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103958893A CN103958893A (en) | 2014-07-30 |
| CN103958893B true CN103958893B (en) | 2016-09-28 |
Family
ID=47016712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280058300.4A Expired - Fee Related CN103958893B (en) | 2011-10-27 | 2012-10-11 | Hydrostatic piston engine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2771571A1 (en) |
| CN (1) | CN103958893B (en) |
| DE (1) | DE102011117081A1 (en) |
| WO (1) | WO2013060576A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204077A (en) | 2010-04-29 | 2015-12-30 | 普拉德研究及开发股份有限公司 | Gain-corrected measurements |
| JP6267598B2 (en) * | 2014-08-01 | 2018-01-24 | 川崎重工業株式会社 | Hydraulic rotating machine |
| EP3020968B1 (en) * | 2014-11-14 | 2016-08-24 | Danfoss A/S | Hydraulic machine, in particular a hydraulic pressure exchanger |
| EP3591224A1 (en) * | 2018-07-05 | 2020-01-08 | Dana Motion Systems Italia S.R.L. | Piston hydraulic device |
| DE102019213675A1 (en) * | 2019-09-10 | 2021-03-11 | Robert Bosch Gmbh | Hydrostatic piston engine unit |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3956969A (en) * | 1974-12-09 | 1976-05-18 | Caterpillar Tractor Co. | Hydrostatic pump including separate noise reducing valve assemblies for its inlet and outlet pressure ports |
| SE507637C2 (en) * | 1991-09-06 | 1998-06-29 | Parker Hannifin Ab | Method and apparatus for damping flow pulsations in hydrostatic displacement hydraulic machines and apparatus for carrying out the method |
| JP2606758Y2 (en) * | 1992-12-22 | 2001-01-09 | 株式会社小松製作所 | Hydraulic pump / motor cylinder chamber pressure control device |
| JP3362576B2 (en) * | 1995-02-10 | 2003-01-07 | ダイキン工業株式会社 | Variable displacement piston machine |
| DE19706116C5 (en) * | 1997-02-17 | 2012-12-20 | Linde Material Handling Gmbh | Device for pulsation reduction on hydrostatic displacement units |
| DE19818721A1 (en) * | 1998-04-27 | 1999-10-28 | Mannesmann Rexroth Ag | Hydrostatic machine |
| DE102008061349A1 (en) * | 2008-09-08 | 2010-03-11 | Robert Bosch Gmbh | Hydrostatic piston machine with pulsation reduction device |
-
2011
- 2011-10-27 DE DE201110117081 patent/DE102011117081A1/en not_active Withdrawn
-
2012
- 2012-10-11 WO PCT/EP2012/070103 patent/WO2013060576A1/en active Application Filing
- 2012-10-11 EP EP12772109.0A patent/EP2771571A1/en not_active Withdrawn
- 2012-10-11 CN CN201280058300.4A patent/CN103958893B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP2771571A1 (en) | 2014-09-03 |
| WO2013060576A1 (en) | 2013-05-02 |
| CN103958893A (en) | 2014-07-30 |
| DE102011117081A1 (en) | 2013-05-02 |
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