EP0661451B1 - Plaque de commande pour une machine hydraulique à piston - Google Patents

Plaque de commande pour une machine hydraulique à piston Download PDF

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Publication number
EP0661451B1
EP0661451B1 EP19940203492 EP94203492A EP0661451B1 EP 0661451 B1 EP0661451 B1 EP 0661451B1 EP 19940203492 EP19940203492 EP 19940203492 EP 94203492 A EP94203492 A EP 94203492A EP 0661451 B1 EP0661451 B1 EP 0661451B1
Authority
EP
European Patent Office
Prior art keywords
insert
control plate
carrier body
plate according
control
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.)
Expired - Lifetime
Application number
EP19940203492
Other languages
German (de)
English (en)
Other versions
EP0661451A1 (fr
Inventor
Egon Kristensen
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
Application filed by Danfoss AS filed Critical Danfoss AS
Publication of EP0661451A1 publication Critical patent/EP0661451A1/fr
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Publication of EP0661451B1 publication Critical patent/EP0661451B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04B1/2042—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 control plate for a hydraulic piston machine, which has a cylinder body rotatable relative to the control plate, the control plate having at least two control "kidneys" which on rotation of the cylinder body lie in the path of movement of an opening of a cylinder in the cylinder body; the invention also relates to a method for the manufacture of the control plate.
  • the invention is based on the problem of providing a control plate for a hydraulic engine which can be operated with poorly lubricating hydraulic fluids yet nevertheless achieves an acceptable volumetric efficiency.
  • control kidneys are formed in at least one insert of plastics material which is secured in a carrier body.
  • the friction between the contact surface of the cylinder body and the control plate in the region of the control kidneys is effected exclusively through a combination of materials, which is constituted in the region of the control plate by the plastics material, but in the region of the cylinder body by the material of the cylinder body, which will normally be a metal, especially steel.
  • the use of the plastics material transfers the "lubrication" function to a machine element. It is known that there are combinations of materials which are able to slide against one another with relatively little friction even under relatively great pressures. By suitable choice of the material for the insert, the friction in the region of the contact surface can therefore be drastically reduced, without it being necessary to supply a lubricating fluid.
  • Plastics materials which are possibilities for the insert are, in particular, materials from the group of high-performance thermoplastic plastics materials on the basis of polyarylether ketones, in particular polyetherether ketones (PEEK), polyamides, polyacetalenes, polyarylethers, polyethyleneterephthalates, polyphenylene sulphides, polysulphones, polyethersulphones, polyetherimides, polyamidimides, polyacrylates, phenol resins, such as novolak resins, or similar substances; glass, graphite, polytetrafluoroethylene or carbon, particularly in fibre form, can be used as fillers. If such materials are used, water may also be used as the hydraulic fluid.
  • PEEK polyetherether ketones
  • polyamides polyacetalenes
  • polyarylethers polyethyleneterephthalates
  • polyphenylene sulphides polysulphones, polyethersulphones, polyetherimides, polyamidimides, polyacrylates, phenol resins, such as novolak resins,
  • the use of the plastics material is restricted here to the insert.
  • the forces acting on the control plate are therefore mainly absorbed by the carrier body.
  • the machine is therefore still capable of being operated with the necessary pressures.
  • the carrier body not only absorbs the forces, but also prevents the insert from being deformed to any appreciable degree.
  • the function of mechanical stability, which is fulfilled substantially by the carrier body, and the reduction in friction, which is fulfilled substantially by the insert are separated here.
  • the insert continues to serve for conduction of the fluid, so that the path of the hydraulic fluid into the cylinder body can be ensured with relatively few problems.
  • the insert preferably projects from the carrier body at least in the direction towards the cylinder body.
  • the projection need not be great. Normally, a few tenths or even a few hundredths of a millimetre will be adequate. This measure ensures, however, that the only area of contact between the control plate and the contact surface of the cylinder body is created on the insert. The cylinder body does not therefore come into contact with the carrier body.
  • the insert is preferably of ring-shaped construction. With the exception of the control kidneys, it therefore forms a closed face against which the contact surface of the cylinder body permanently lies. Problems that could arise because of transitions or steps are consequently precluded from the start.
  • the insert is preferably joined to the carrier body by means of a press fit.
  • the press fit on the one hand secures a sufficiently firm seat of the insert in the carrier body, and on the other hand it does not require any additional fixing means, for the use of which the carrier body or the insert would have to undergo additional machining.
  • the press fit at the same time creates a certain seal between the carrier body and the insert, but this seal need not be absolute.
  • the insert advantageously projects from the carrier body also on the side facing away from the cylinder body.
  • This side normally lies adjacent to a so-called rear flange in the hydraulic machine, through which the inlet and outlet ducts for the hydraulic fluid pass. If the insert projects also on this side above the control plate, when the control plate is pressed against the rear flange a better seal between the control plate and the rear flange can be achieved than would be the case if the carrier body alone were to be arranged adjacent to the rear flange. Additional seals are therefore unnecessary when the insert is constructed projecting from the carrier body also on the side facing away from the cylinder body.
  • a pressure relief channel is especially preferable for a pressure relief channel to be provided in the insert or in the carrier body on the side facing away from the cylinder body and for it to be arranged between the control kidneys. If the insert projects on this side beyond the carrier body, an enclosed space is created between the carrier body and the rear flange into which hydraulic fluid is able to penetrate under certain circumstances.
  • the pressure relief channel prevents the incoming fluid building up an uncontrollable pressure here. On the contrary, incoming hydraulic fluid is able to flow away without problems so that neither the insert nor the carrier body can be stressed.
  • the insert is preferably divided.
  • the two parts of the insert or the two inserts can be matched to the particular conditions.
  • the insert that lies opposite the cylinder body can be constructed with a view to reducing friction.
  • the part that lies adjacent to the rear flange can be considered more from the point of view of its sealing function, because the control plate does not normally move with respect to the rear flange.
  • the carrier body is formed from two rings which lie adjacent to the insert radially inwardly and outwardly.
  • the control plate is therefore divided into three, with, from the inside radially outwards, one ring forming part of the carrier body, one ring constituting the insert and a further ring forming part of the carrier body lying adjacent to one another.
  • Mechanical stability is ensured by the two rings of the carrier body, whilst sliding quality and the creation of the seal between the control plate and the cylinder body is ensured by the plastics material insert.
  • a control plate of that kind can be manufactured relatively easily, because the rings, which are preferably formed from stainless steel, can be manufactured relatively simply. Machining of the carrier body to produce the control kidneys is not required.
  • the carrier body may have a circumferential annular groove to receive the insert.
  • the carrier body can also accommodate forces that act axially, which means that the control plate can be stressed to a greater degree.
  • machining of the carrier body is necessary.
  • At least one drainage bore is provided in the carrier body, starting on the side facing away from the cylinder body and opening out between the insert and carrier body; the drainage bore is provided in particular in the region of the control kidney which is exposed to hydraulic fluid under pressure.
  • the drainage bore ensures that hydraulic fluid penetrating between the carrier body and the insert is able to drain off before it builds up a pressure in this region between the insert and the carrier body which could lead to separation of the carrier body and the insert.
  • the insert has a joint running in the circumferential direction, which divides the insert into a radially inner and a radially outer part.
  • joint is intended here to refer merely to a structural element that separates the radially inner and the radially outer part of the insert from one another. This does not mean, however, that the two parts of the insert have some sort of radial spacing between them. On the contrary, these two parts lie closely side by side. In some extreme examples of stress, it has been shown that the plastics material insert breaks under the effect of these high stresses, and the fracture point can be monitored only with difficulty. The provision of a joint anticipates, as it were, this fracture point.
  • a control plate having an insert of such a construction operates without problems even under extreme stress.
  • the radial division of the insert can be applied both when the insert passes through the carrier body completely, and when the insert is pressed from one or from both sides into the carrier. In all cases, after the insertion, if desired, machining of the surface of the insert will still be required to achieve the required transition-free smoothness of the sliding surface to the cylinder body.
  • the joint is especially preferable for the joint to run right through the control kidneys.
  • the joint need in that case merely bridge the gaps between the two control kidneys, so that the provision of the joint in principle causes no appreciable weakening of the insert.
  • the invention also relates to a method for the manufacture of a control plate, as described above, in which the insert is inserted as a solid part into the carrier body and the control kidneys are created therein subsequently by machining.
  • the control kidneys can be created, for example by milling. This measure ensures that, despite the use of an insert, the control kidneys are positioned in relation to the control plate exactly at the position where they are intended to be. When assembling the insert and carrier body, no attention need therefore be paid to assembling them in the correct position. In particular in a construction in which the control kidneys run partly also in the carrier body, it is thus possible to ensure that the transition between the carrier body and the insert for the fluid is smooth, that is, that no undesirable steps are created between the insert and carrier body by the assembly thereof.
  • the insert is preferably pressed into the carrier body. Pressing produces a relatively firm join, in particular a press fit, which can be achieved with relatively little effort. Pressing can be effected in one operation or, if desired, also several operations.
  • the insert is preferably shrunk into the carrier body.
  • Such a procedure is advisable in particular in the case of the carrier body that is divided into two rings.
  • first of all the inner steel ring can be shrunk in; prior to insertion in the plastics material ring it is cooled, after which the outer ring is shrunk onto the insert.
  • the outer ring must have been heated prior to this.
  • the plastics material insert too can be heated before it is shrunk onto the inner steel ring of the carrier body.
  • An insert having an overdimension in the range from 2 to 8%, especially 3 to 5% of the diameter of the insert in its installed state is preferably used for that purpose.
  • a hydraulic machine has a cylinder body 1 in which at least one cylinder 2 is arranged.
  • a piston 3 is arranged to move up and down in the cylinder 2. The movement of the piston 3 is controlled by way of a swash plate 4 against which the piston 3 lies via the intermediary of a slider shoe 5.
  • the opposite end face of the cylinder body 1, that is, the side from which the piston does not project, has a contact surface 6 with which the cylinder body 1 lies against a control plate 7, which is here shown only diagrammatically. If the cylinder body 1 is now rotated in the direction of an arrow 8, the contact surface 6 of the cylinder body 1 slides over an opposing contact surface 9 of the control plate 7. On each rotation of the cylinder body 1, an opening 10 in the cylinder 2 comes into register alternately with an inlet opening 11 and an outlet opening 12 in the control plate; these openings are connected to a suction port and a discharge port respectively, not shown more specifically. In this case, the machine is being used as a pump.
  • the inlet opening 11 is connected to a pressure connection while the outlet opening 12 is connected to a tank connection.
  • hydraulic fluid is consequently conveyed into the cylinder 2, whilst during a downward movement the hydraulic fluid is expelled from the cylinder 2.
  • control kidneys it is necessary for the remaining regions of the contact surfaces 6, 9 to seal off this fluid path.
  • the cylinder body 1 and the control plate 7 must therefore lie against one another with a certain pressure.
  • FIG. 2a A first embodiment of the control plate 7 is illustrated in Fig. 2, Fig 2a being a plan view and Fig. 2b being a section II-II according to Fig. 2a.
  • the control plate 7 in this case consists of two rings 13, 14 manufactured from stainless steel, between which there is arranged an insert 15 of plastics material.
  • the control plate 7 is manufactured, for example, in that the two steel rings 13, 14 are shrunk with a press fit onto the insert 15.
  • the control kidneys 11, 12 are then created by machining in a manner known per se by milling.
  • the insert 15 may have an overdimension of between 2 and 8%, in particular in the range from 3 to 5%, of the diameter of the mounted insert.
  • the press fit can be effected in one or, if desired, several operations. In this manner, for example, first of all the inner steel ring 14 can be pressed onto the insert 15 and then the outer steel ring 13 can be pressed onto the insert 15.
  • Manufacture depends, however, on the tools used. It is also possible first of all to cool the inner steel ring 14, so that it contracts, and to insert it into the insert 15. The outer ring 13, which has previously been heated, is then shrunk down onto the insert 15. Of course, the manufacturing process could be effected in the reverse order.
  • the two rings 13, 14 form a carrier body in which the insert 15 is secured.
  • thermoplastic plastics materials on the basis of polyarylether ketones, in particular polyetherether ketones (PEEK), polyamides, polyacetalenes, polyarylethers, polyethylene terephthalates, polyphenylene sulphides, polysulphones, polyethersulphones, polyetherimides, polyamidimides, polyacrylates, phenol resins, such as novolak resins, or similar substances are possibilities as material for the plastics material.
  • PEEK polyetherether ketones
  • polyamides polyacetalenes
  • polyarylethers polyethylene terephthalates
  • polyphenylene sulphides polysulphones
  • polyethersulphones polyetherimides
  • polyamidimides polyacrylates
  • phenol resins such as novolak resins, or similar substances
  • the carrier body 13, 14 has a recess 16 with the assistance of which the control plate 7 can be held, safeguarded against rotation, in the machine.
  • the control plate 7 On the side facing away from the cylinder body 1, the control plate 7 has two pressure relief channels 18, by which a space 19 on the side of the control plate 7 facing away from the cylinder body 1 is connected to the atmosphere; in the installed state of the control plate this space is further defined by a rear flange, not shown. Hydraulic fluid which may penetrate into this space 19 can flow away through the pressure relief channels 18 without problem.
  • Fig. 3 shows a second embodiment of a control plate 7', Fig. 3b being a section along the line III-III of Fig. 3a. Parts that correspond to those of Fig. 2 are denoted by the same reference numbers.
  • the carrier body 20 in the arrangement according to Fig. 3 is of one piece construction. It has a ring-shaped circumferential groove 21 into which the insert 22 is pressed.
  • the two control kidneys 11, 12 are in turn created in the insert 22 by milling.
  • the pressure relief channel 23 is arranged this time in the carrier body 20.
  • two drainage bores 24, 25 are provided. These start at the side of the control plate 7' facing away from the cylinder body 1 and open out between the carrier body 20 and the insert 22 into the groove 21.
  • the drainage bores 24, 25 are arranged in the region of the control kidney 11 which is supplied with hydraulic fluid under pressure when the motor is in operation. Hydraulic fluid that penetrates between the insert 22 and the carrier body 20 despite the press fit is able to flow away through the drainage bores 24, 25 without problems and without causing any damage.
  • Fig. 4 and 5 show a further example of a control plate 7'' in which identical parts are again denoted by the same reference numbers.
  • a further insert 27 is provided in the carrier body 26 and is arranged on the side of the control plate 7'' facing away from the cylinder body 1.
  • the carrier body 26 has a circumferential groove 28 on this side to receive the second insert 27.
  • the control plate 7'' which in its mounted state lies with its side facing away from the cylinder body 1 against a rear flange, is sealed better with this insert 27 than it is when it is in direct contact with the carrier body rear flange.
  • the two inserts 22, 27 can consist of the same material. Alternatively, they can consist of different materials, greater importance being attached to the frictional aspect in choosing the material for the insert 22, whereas the material of the insert 27 is selected more from the point of view of its sealing properties. If both inserts 22, 27 are made of the same material, one can also say that the insert is divided.
  • Fig. 5 illustrates the manner in which both the insert 22 and the insert 27 project from the carrier body 26, namely, by a distance D. This distance has been shown on an exaggeratedly large scale for the purposes of illustration. In reality, the insert 22 will project from the carrier body 26 only by a few tenths or even a few hundredths of a millimetre. The same applies to the constructions shown in Figs 2 and 3.
  • the inserts 22, 27 shown in Figs 3 to 5 are also first of all inserted in the carrier bodies 20 and 26, respectively, for example by pressing or shrinking. Only then are the control kidneys 11, 12 created therein by milling. There is consequently no step at the transition from the insert to the carrier body or vice versa .
  • Fig. 6 shows a fourth embodiment of a control plate 7''', in which the carrier body 29 can be constructed not only as in Fig. 2 but also as in Fig. 3 or 4.
  • the carrier body is divided by a circumferential joint 30 into a radial inner part 31 and a radial outer part 32.
  • the joint passes through the control kidneys 11, 12.
  • the insert 31, 32 is also first of all secured to the carrier body 29 with a press fit.
  • the control kidneys 11, 12 are then created by machining, for example, by milling.
  • a surface-finishing of the insert 31, 32 subsequently follows, if desired, even before the control kidneys 11, 12 are produced by milling, in order to achieve a surface that is as smooth, i.e. transition-free, as possible on which the cylinder body is able to slide.
  • the two parts 31, 32 lie closely side by side.

Claims (17)

  1. Plaque de commande pour un moteur hydraulique à piston, qui possède un corps à cylindre pouvant tourner par rapport à la plaque de commande, la plaque de commande possédant au moins deux ouvertures de commande en forme de haricots qui, lors de la rotation du corps à cylindre sont situées dans le trajet de déplacement d'une ouverture d'un cylindre, situé dans le corps à cylindre, caractérisée en ce que les ouvertures de commande en forme de haricots (11,12) sont formées dans au moins un insert (15,22,27) en matière plastique qui est fixé dans un corps de support (13,14;20,26).
  2. Plaque de commande selon la revendication 1, caractérisée en ce que l'insert (15,22,27) fait saillie à partir du corps de support (13,14;20,26) au moins dans la direction tournée vers le corps à cylindre (1).
  3. Plaque de commande selon la revendication 1 ou 2, caractérisée en ce que l'insert (15,22,27) est une structure de forme annulaire.
  4. Plaque de commande selon la revendication 3, caractérisée en ce que des moyens empêchant une rotation (17) sont prévus entre l'insert (15,22) et le corps de support (13,14;26).
  5. Plaque de commande selon l'une des revendications 1 à 4, caractérisée en ce que l'insert (15,22,27) est réuni au corps de support (13,14;20,26) selon un ajustement serré.
  6. Plaque de commande selon l'une des revendications 1 à 5, caractérisée en ce que l'insert (15,27) fait également saillie, à partir du corps de support (13,14;26) sur la face située à l'opposé du corps à cylindre (1).
  7. Plaque de commande selon la revendication 6, caractérisée en ce qu'un canal de détente de pression (18,23) est prévu dans l'insert (15) ou dans le corps de support (26) sur la face située à l'opposé du corps à cylindre (1) et est disposé entre les ouvertures de commande en forme de haricots (11,12).
  8. Plaque de commande selon la revendication 6 ou 7, caractérisée en ce que l'insert (22,27) est divisé.
  9. Plaque de commande selon l'une des revendications 1 à 8, caractérisée en ce que le corps de support (13,14) est formé de deux anneaux qui sont adjacents à l'insert (15) dans une direction radiale à partir de l'intérieur et à partir de l'extérieur.
  10. Plaque de commande selon l'une des revendications 1 à 8, caractérisée en ce que le corps de support (20,26) possède une gorge annulaire circonférentielle (21,28) servant à loger l'insert (22,27).
  11. Plaque de commande selon la revendication 10, caractérisée en ce qu'au moins un perçage d'évacuation (24,25) est prévu dans le corps de support (20) en partant de la face située à l'opposé du corps à cylindre (1) et débouchant entre l'insert (22) et le corps de support (20), le perçage d'évacuation (24,25) étant prévu notamment dans la région de l'ouverture de commande en forme de haricot (11), lorsqu'il est exposé à un fluide hydraulique sous pression.
  12. Plaque de commande selon l'une des revendications 1 à 11, caractérisée en ce que l'insert (29) possède un joint (30) qui s'étend dans la direction circonférentielle, qui divise l'insert (29) en une partie radiale intérieure (31) et une partie radiale extérieure (32).
  13. Plaque de commande selon la revendication 12, caractérisée en ce que le joint (30) s'étend dans les ouvertures de commande en forme de haricots (11,12).
  14. Procédé pour fabriquer une plaque de commande selon l'une des revendications 1 à 13, caractérisé en ce que l'insert est introduit en tant que pièce pleine ou en tant que pièces pleines dans le corps de support et que les ouvertures de commande en forme de haricots sont créées ensuite par usinage dans l'insert.
  15. Procédé selon la revendication 14, caractérisé en ce que l'insert est enfoncé dans le corps du support.
  16. Procédé selon la revendication 14 ou 15, caractérisé en ce que l'insert est inséré par frettage à chaud dans le corps de support.
  17. Procédé selon l'une des revendications 14 à 16, caractérisé en ce qu'on utilise un insert possédant une dimension excessive dans la gamme de 2 à 8%, en particulier 3 à 5% du diamètre de l'insert dans son état installé.
EP19940203492 1993-12-08 1994-12-01 Plaque de commande pour une machine hydraulique à piston Expired - Lifetime EP0661451B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4341846 1993-12-08
DE19934341846 DE4341846C1 (de) 1993-12-08 1993-12-08 Steuerspiegel für eine hydraulische Kolbenmaschine

Publications (2)

Publication Number Publication Date
EP0661451A1 EP0661451A1 (fr) 1995-07-05
EP0661451B1 true EP0661451B1 (fr) 1997-05-21

Family

ID=6504485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940203492 Expired - Lifetime EP0661451B1 (fr) 1993-12-08 1994-12-01 Plaque de commande pour une machine hydraulique à piston

Country Status (2)

Country Link
EP (1) EP0661451B1 (fr)
DE (1) DE4341846C1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9416848U1 (de) * 1994-10-19 1995-01-12 Brueninghaus Hydromatik Gmbh Hydrostatische Axialkolbenmaschine mit einem mittels einer Gleitscheibe aus Lagermaterial drehgelagerten Zylinderblock
WO2009124745A1 (fr) 2008-04-11 2009-10-15 Robert Bosch Gmbh Tambour de cylindre à écoulement optimisé pour machines hydrostatiques à pistons
JP6110074B2 (ja) * 2012-03-30 2017-04-05 三菱重工業株式会社 流体圧ポンプ
JP2017057790A (ja) * 2015-09-16 2017-03-23 Ｋｙｂ株式会社 液圧回転機及びそのバルブプレート

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB938859A (en) * 1959-06-02 1963-10-09 Dowty Hydraulic Units Ltd Improved valve
FR1346890A (fr) * 1963-02-13 1963-12-20 Lucas Industries Ltd Perfectionnements aux pompes et moteurs hydrauliques
US3523678A (en) * 1968-03-13 1970-08-11 Lucas Industries Ltd Valve plate for a hydraulic pump or motor
US3582090A (en) * 1968-11-06 1971-06-01 Ec Corp Face seal structure
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

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Publication number Publication date
DE4341846C1 (de) 1995-07-13
EP0661451A1 (fr) 1995-07-05

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