EP0679227B1 - Hydraulische kolbenmaschine - Google Patents

Hydraulische kolbenmaschine Download PDF

Info

Publication number
EP0679227B1
EP0679227B1 EP94904992A EP94904992A EP0679227B1 EP 0679227 B1 EP0679227 B1 EP 0679227B1 EP 94904992 A EP94904992 A EP 94904992A EP 94904992 A EP94904992 A EP 94904992A EP 0679227 B1 EP0679227 B1 EP 0679227B1
Authority
EP
European Patent Office
Prior art keywords
low
jet
opening
groove
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP94904992A
Other languages
English (en)
French (fr)
Other versions
EP0679227A1 (de
Inventor
Hardy Peter Jepsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danfoss AS
Original Assignee
Danfoss AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6478387&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0679227(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Danfoss AS filed Critical Danfoss AS
Publication of EP0679227A1 publication Critical patent/EP0679227A1/de
Application granted granted Critical
Publication of EP0679227B1 publication Critical patent/EP0679227B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Images

Classifications

    • 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
    • F04B1/2021—Details or component parts characterised by the contact area between cylinder barrel and valve plate
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the invention relates to a hydraulic piston machine with a cylinder body and a control counter-plate which engage one another via the intermediary of a control surface, the cylinder body having several cylinders which emerge by way of an opening into the control surface and the control counter-plate has a high-pressure channel and a low-pressure channel which are connected to a high-pressure connection and a low-pressure connection respectively and, upon movement of cylinder body and control counter-plate relative to one another, are passed over by the opening, the low-pressure channel having a groove at its end passed over first by the opening.
  • DE 37 25 361 A1 describes how such jetflow erosion in the cylinder can be avoided: a channel for a disturbing jet emerges into the groove in such a way that the flow directions of the fluid entering the cylinder from the groove and of the fluid leaving the opening of the channel for the disturbing jet meet. This produces turbulence of the fluid which prevents the fluid striking the cylinder wall at high speed.
  • JP 57-171086 shows how the same conditions with a disturbing jet can be used in connection with both the high-pressure and low-pressure side.
  • the invention is therefore based on the problem of guaranteeing as long a service life of the machine as possible even when using low-viscosity hydraulic fluids.
  • the throttling effect of the groove can therefore here largely be dispensed with.
  • one has to accept a higher speed of the hydraulic fluid emerging from the cylinder into the low-pressure channel.
  • this jet can be directed so that it does not cause any significant damage. This can be achieved most easily by making the jet cover as long a path as possible in the low-pressure channel before it meets the wall of the low-pressure channel.
  • the damping that is to say, the braking of the fluid transported in the jet of fluid, is then effected by the surrounding fluid.
  • the fluid of the jet has only relatively little energy left, which is not normally sufficient to cause appreciable damage.
  • the jet also fans out in the surrounding fluid so that it is no longer so fierce.
  • the jet therefore has to pass through the flow of fluid leaving the next cylinder or entering the next cylinder.
  • This effects an additional damping of the jet, that is, the fluid conveyed in the jet, in that the jet is disturbed by the hydraulic fluid emerging from the next cylinder in the direction of movement or the hydraulic fluid entering it.
  • the jet is consequently further deflected, namely, in a direction at right angles to the control surface.
  • the jet is similarly disturbed, or rather the hydraulic fluid undergoes local turbulence, which absorbs more energy.
  • the jet is preferably inclined in relation to the control surface, the groove being correspondingly inclined at its base.
  • the inclination is designed so that the distance between the groove base and the control surface is larger at the start of the groove than at the end of the groove, the end of the groove being located at the transition to the low-pressure channel.
  • the jet can be prevented from striking the groove base and causing damage there through jet erosion.
  • the jet already has the opportunity to fan out in the groove, so that when it enters the low-pressure channel it can immediately be damped by the surrounding fluid and can therefore be braked.
  • a positive side effect is that noise is reduced.
  • the low-pressure connection advantageously has an opening in the direction of movement, at least in the region of the start of the low-pressure channel.
  • This has the advantage that, in motor operation, in the low-pressure channel, at least in the region of its commencement, there exists a flow which is substantially opposite to the jet direction. This leads to further damping or braking of the fluid of the jet, so that further energy can be extracted from the jet as a result.
  • the low-pressure connection can, of course, also be allowed to emerge into other regions of the low-pressure channel as well.
  • the jet is in this connection preferably directed into the low-pressure connection.
  • this does increase the speed of one component of the jet, namely, the component running at right angles to the control surface, because this component acts in the same direction as the corresponding component of the outflowing fluid. But this results in a further deflection of the jet, which more than compensates for that effect.
  • the path between the start of the groove and the projected point of impact can be further enlarged. The damping and braking effect is consequently further increased.
  • pump operation the fluid flow is directed oppositely to this component and thus brakes it.
  • the control counter-plate is preferably completely enclosed by a friction-reducing layer.
  • the friction-reducing layer therefore also lines the walls of the low-pressure channel.
  • a friction-reducing layer of that kind in particular in conjunction with the low-viscosity hydraulic fluids, has advantages, since these fluids generally have no lubricating properties.
  • a friction-reducing layer of that kind is generally more susceptible to erosion by fierce jets of fluid, but in the present case this is unimportant since provision has been made to ensure that no fierce jets of fluid are able to strike this layer.
  • the layer is especially preferable for the layer to be formed from plastics material.
  • plastics materials which may be considered for the layer are, in particular, materials from the group of high-strength thermoplastic plastics materials on the basis of polyaryl ether ketones, in particular polyether ether ketones, polyamides, polyacetals, polyaryl ethers, polyethylene terephthalates, polyphenylene sulphides, polysulphones, polyether sulphones, polyether imides, polyamide imide, polyacrylates, phenol resins, such as novolak resins, or similar substances, and as fillers, use can be made of glass, graphite, polytetrafluoroethylene or carbon, in particular in fibre form. When using such materials, it is likewise possible to use water as the hydraulic fluid.
  • a hydraulic piston machine which operates according to the axial piston principle, has a cylinder body 1, only the lower end of which is illustrated, in which there are arranged openings 2 by means of which the cylinders arranged in the cylinder body 1 emerge into a control surface 3.
  • the cylinder body 1 lies by way of this control surface 3 in two-dimensional engagement with a control counter-plate 4.
  • the control counter-plate 4 has a low-pressure channel 5 and a high-pressure channel 6 divided into several sections, which channels connect respectively with a low-pressure connection 7 and, not illustrated in detail, a high-pressure connection.
  • the low-pressure channel 5 and the high-pressure channel 6 are of arcuate or kidney-shaped construction and are therefore also sometimes referred to as "control kidneys".
  • the low-pressure channel 5 has for this purpose at its leading end, that is to say, at the end over which an opening 2 passes first, a groove 9, which is shifted radially inwards with respect to a circle 10 defining the radial centre of the low-pressure channel 5 and the high-pressure channel 6.
  • the groove 9 is relatively wide and relatively deep so that it has virtually no, or only a negligible, throttling effect on the hydraulic fluid flowing through.
  • the groove 9 and the section 11 of the opening 2 coming into contact with it first are matched to one another so that immediately after the start of the overlap between the opening 2 and the groove 9 a jet of fluid 12 is produced which is directed so that it has to cover as large a path as possible in the low-pressure channel before it meets a wall 13 of the low-pressure channel 5 and the low-pressure connection 7, which is arranged in a rear flange 14.
  • a jet of fluid 12 is produced which is directed so that it has to cover as large a path as possible in the low-pressure channel before it meets a wall 13 of the low-pressure channel 5 and the low-pressure connection 7, which is arranged in a rear flange 14.
  • the fluid of the jet 12 loses speed considerably.
  • the surrounding hydraulic fluid damps the jet 12 and brakes it.
  • the jet consequently fans out so that it is no longer possible for the wall 13 to be struck by a fierce jet.
  • a projected point of impact 15 at which an unchecked jet 12 would strike the wall 13 is defined merely for the purposes
  • the jet 12 passes an opening 2' in a leading cylinder in the direction of movement 8. Since this cylinder likewise delivers fluid into the low-pressure channel 5 and receives fluid therefrom, a further damping of the jet 12 is effected here, accompanied by a certain local turbulence of the fluid.
  • the jet 12 is acted on here by a flow component substantially at right angles to its direction.
  • the jet 12 is directed into the low-pressure connection 7, that is to say, it is directed (in Fig. 2) downwardly.
  • the jet 12 has a component that is directed away from the control surface 3. Accordingly, the base 16 of the groove 9 is also correspondingly inclined, to prevent the jet 12 striking the groove base 16.
  • the control counter-plate 4 is completely enclosed by a friction-reducing layer 17 of a plastics material, such as polyamide (nylon), polytetrafluoroethylene (PTFE) or polyarylether ketone, especially polyether ether ketone (PEEK).
  • a plastics material such as polyamide (nylon), polytetrafluoroethylene (PTFE) or polyarylether ketone, especially polyether ether ketone (PEEK).
  • This layer reduces frictional losses between the control counter-plate 4 and the cylinder body 1, even when the hydraulic fluid has no lubricating properties.
  • a layer 17 is relatively susceptible to jet erosion by fierce jets of fluid 12, these are sufficiently damped and braked before they strike the wall 13, so that erosion damage need not in practice be feared.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Invalid Beds And Related Equipment (AREA)

Claims (7)

  1. Hydraulische Kolbenmaschine mit einem Zylinderkörper und einem Steuerspiegel, die über die Mitte einer Steuerfläche aneinander anliegen, wobei der Zylinderkörper mehrere Zylinder aufweist, die über eine Öffnung in die Steuerfläche münden, und der Steuerspiegel einen Hochdruckkanal und einen Niederdruckkanal aufweist, die mit einem Hochdruck- bzw. einem Niederdruckanschluß verbunden sind und bei einer Bewegung von Zylinderkörper und Steuerspiegel relativ zueinander von der Öffnung überstrichen werden, wobei der Niederdruckkanal an seinem zuerst von der Öffnung überstrichenen Ende eine Nut aufweist, dadurch gekennzeichnet, daß die Nut (9) zusammen mit der Öffnung (2) zumindest unmittelbar nach dem Beginn ihrer Überdeckung einen gerichteten Strahl (12) erzeugt, der so gerichtet ist, daß er die Projektion zumindest der Öffnung (2) des in Bewegungsrichtung (8) nächsten Zylinders kreuzt.
  2. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß zwischen dem Anfang der Nut (9) und einem projizierten Auftreffpunkt (15) des Strahls (12) auf eine Wand (13 des Kanals (5) eine Strecke liegt, die größer als das 3,5-fache der Breite (d) des Kanals (5) ist.
  3. Maschine nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der Strahl (12) in bezug auf die Steuerfläche (3) geneigt ist, wobei die Nut (9) an ihrem Grund (16) eine entsprechende Neigung aufweist.
  4. Maschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Niederdruckanschluß (7) in Bewegungsrichtung zumindest im Bereich des Anfangs des Niederdruckkanals (5) eine Mündung aufweist.
  5. Maschine nach Anspruch 4, dadurch gekennzeichnet, daß der Strahl (12) in den Niederdruckanschluß (7) hineingerichtet ist.
  6. Maschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Steuerspiegel (4) von einer reibungsvermindernden Schicht (17) vollständig umgeben ist.
  7. Maschine nach Anspruch 6, dadurch gekennzeichnet, daß die Schicht (17) aus einem Kunststoff gebildet ist.
EP94904992A 1993-01-18 1994-01-06 Hydraulische kolbenmaschine Revoked EP0679227B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19934301135 DE4301135C2 (de) 1993-01-18 1993-01-18 Hydraulische Kolbenmaschine
DE4301135 1993-01-18
PCT/DK1994/000009 WO1994016220A1 (en) 1993-01-18 1994-01-06 Hydraulic piston machine

Publications (2)

Publication Number Publication Date
EP0679227A1 EP0679227A1 (de) 1995-11-02
EP0679227B1 true EP0679227B1 (de) 1997-04-16

Family

ID=6478387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94904992A Revoked EP0679227B1 (de) 1993-01-18 1994-01-06 Hydraulische kolbenmaschine

Country Status (4)

Country Link
EP (1) EP0679227B1 (de)
AU (1) AU5879794A (de)
DE (1) DE4301135C2 (de)
WO (1) WO1994016220A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3056730A1 (de) 2015-02-11 2016-08-17 Danfoss A/S Hydraulische Vorrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10200545A1 (de) * 2001-12-11 2003-06-26 Liebherr Machines Bulle S A Steuerplatte für Hydromotoren und -pumpen vom Axialkolbentyp sowie Verfahren zu ihrer Herstellung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585901A (en) * 1969-02-19 1971-06-22 Sundstrand Corp Hydraulic pump
US4550645A (en) * 1984-04-27 1985-11-05 Sundstrand Corporation Thin valve plate for a hydraulic unit
DE3725361A1 (de) * 1987-07-30 1989-02-16 Brueninghaus Hydraulik Gmbh Axialkolbenmaschine in schraegscheiben- oder schraegachsenbauart mit schlitzsteuerung und druckausgleichskanaelen
DE4035748A1 (de) * 1989-11-09 1991-05-16 Vickers Systems Gmbh Axialkolbenpumpe fuer hohe drehzahlen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3056730A1 (de) 2015-02-11 2016-08-17 Danfoss A/S Hydraulische Vorrichtung

Also Published As

Publication number Publication date
EP0679227A1 (de) 1995-11-02
DE4301135A1 (de) 1994-07-21
DE4301135C2 (de) 1995-04-06
WO1994016220A1 (en) 1994-07-21
AU5879794A (en) 1994-08-15

Similar Documents

Publication Publication Date Title
US4920856A (en) Axial piston machine of the swashplate or bent axis type having slot control and pressure balancing passages
JP4020964B2 (ja) ダイヤフラムポンプ
JPH0599120A (ja) 洗浄水用の高圧水ポンプ
US20100266427A1 (en) Guide ring for a piston pump, and piston pump
CA2076531C (en) Arrangement for an axial bearing in a drilling machine
EP0679227B1 (de) Hydraulische kolbenmaschine
US5622097A (en) Hydraulic piston machine
US20150068782A1 (en) Percussion device
WO2021083568A1 (de) Kühlmittelpumpe mit verbesserter spaltdichtung
US4746280A (en) Sliding vane pump
JP3979313B2 (ja) 高圧ポンプ
WO1997040274A1 (de) Peripheralpumpe
US5598761A (en) Hydraulic axial piston machine with control face located in rear flange and friction-reducing plastic insert in rear flange
GB1596109A (en) Sliding vane rotary fluid machine
EP1881196A1 (de) Axialkolbenpumpe- oder Taumelscheiben- oder Schrägachsmotor
JP2851391B2 (ja) 配量装置
JPH07310674A (ja) 液圧ピストン機械
JPH04504455A (ja) 高圧プランジャポンプ
CN110094316B (zh) 液压机
EP0832356B1 (de) Hydraulische kolbenmaschine
JPS6145073B2 (de)
KR910004987B1 (ko) 기체펌프용 피스톤
KR100647761B1 (ko) 왕복 피스톤 펌프용 각진 유동 포트
GB2198485A (en) Radial piston machine
JP3986095B2 (ja) 媒体を搬送するためのポンプ

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19950627

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DK FR GB IT

17Q First examination report despatched

Effective date: 19951218

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DK FR GB IT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19970416

Ref country code: DK

Effective date: 19970416

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19971210

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980106

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

26 Opposition filed

Opponent name: LINDE AKTIENGESELLSCHAFT

Effective date: 19980116

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

RDAH Patent revoked

Free format text: ORIGINAL CODE: EPIDOS REVO

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19980106

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 19980906