EP0708242A1 - Machine hydrostatique à pistons axiaux avec une plaque de glissement - Google Patents

Machine hydrostatique à pistons axiaux avec une plaque de glissement Download PDF

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Publication number
EP0708242A1
EP0708242A1 EP95115242A EP95115242A EP0708242A1 EP 0708242 A1 EP0708242 A1 EP 0708242A1 EP 95115242 A EP95115242 A EP 95115242A EP 95115242 A EP95115242 A EP 95115242A EP 0708242 A1 EP0708242 A1 EP 0708242A1
Authority
EP
European Patent Office
Prior art keywords
cylinder block
piston machine
axial piston
control body
machine according
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.)
Granted
Application number
EP95115242A
Other languages
German (de)
English (en)
Other versions
EP0708242B1 (fr
Inventor
Josef Beck
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.)
Brueninghaus Hydromatik GmbH
Original Assignee
Brueninghaus Hydromatik GmbH
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 Brueninghaus Hydromatik GmbH filed Critical Brueninghaus Hydromatik GmbH
Publication of EP0708242A1 publication Critical patent/EP0708242A1/fr
Application granted granted Critical
Publication of EP0708242B1 publication Critical patent/EP0708242B1/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
    • F04B1/2021—Details or component parts characterised by the contact area between cylinder barrel and valve plate
    • 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
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0469—Other heavy metals
    • F05C2201/0475—Copper or alloys thereof
    • F05C2201/0478—Bronze (Cu/Sn alloy)
    • 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
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • 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 hydrostatic axial piston machine according to the preamble of claim 1.
  • the cylinder chambers of such an axial piston machine known from the prior art are connected to their pressure medium connections (pressure and suction connection) via corresponding bores opening out at the end face of the cylinder block and kidney-shaped control slots in the control body.
  • the bores or the control slots also run through the sliding washer in accordance with their assignment to the cylinder block or to the control body.
  • DE-OS 2 237 418 describes such a material connection, which is produced by welding the sliding washer to the cylinder block of a hydrostatic pump.
  • DE-OS 2 431 254 also discloses such a material closure as a result of the galvanic application of a copper layer to the end face of the cylinder block of a hydrostatic machine, the insertion of a so-called filling space on the end face, the filling of the filling space with bronze powder, and the closing of the filling space with a pressure plate and then pressing and sintering the bronze powder.
  • Material-locking connections of the sliding washer are disadvantageous in that they can only be produced with a limited number of bearing materials, are often not sufficiently safe and their production requires a great deal of time and money.
  • the relief channel arrangement has such a total cross-sectional area and distribution that surface areas of metallic contact between the sliding disc and the cylinder block or the control body result from the resulting pressure medium relief.
  • Such surface areas of metallic contact reduce the stress on the sliding washer and thus increase the security of its attachment.
  • other sealing options such as O-rings or molded seals, can be used to prevent pressure medium from flowing in between the sliding disk and the cylinder block or control body except through the relief channel arrangement.
  • the slide washer is held in the recess due to thermal expansion after insertion into the recess and thus attached in the simplest way to the cylinder block or to the control body.
  • the slide washer can be fastened by a positive connection between its peripheral surface and the wall surface of the depression facing it.
  • the positive connection is preferably a dovetail arrangement running in the circumferential direction of the sliding disk and the depression.
  • the positive connection can also be provided with an axially extending undercut of the wall surface of the depression and an associated bevel of the peripheral surface of the sliding washer or with a radially outward projection on the sliding washer and an overlapping projection projecting inwards from the wall surface of the depression Be formed.
  • Figure 1 shows a cylinder block 1 and a control body 2 of a conventional axial piston machine and a sliding washer 3 made of a bearing material such as forged bronze, sintered material or ceramic.
  • the cylinder block 1 has a circular cross section and is formed with a central through bore 4 and, for example, eight cylinder spaces 5, each of which opens out through a bore 6 on the end face 7 of the cylinder block 1 facing the control body 2.
  • the through bore 4 serves for receiving the drive shaft, not shown, and the cylinder spaces 5 for receiving the pistons of the axial piston machine, also not shown.
  • the cylinder rooms 5 are arranged at regular intervals on a pitch circle concentric with the through bore 4; they open out on the end face of the cylinder block 1 facing away from the end face 7 with a somewhat greater radial distance from the through bore 4 than at their bore-side ends.
  • the control body 2 fastened to the housing of the axial piston machine, not shown, controls the pressure medium supply and discharge to and from the cylinder spaces 5 of the cylinder block 1 in a known manner with the aid of two kidney-shaped control slots 8, 9 and also serves to axially pivot the same via the sliding disk 3.
  • the control surface 10 of the control body 2 facing the cylinder block 1 is spherically convex.
  • the control body 2 has a central through bore 11, which is aligned with the through bore 4 in the cylinder block 1, for receiving the drive shaft.
  • annular recess 12 is formed which is concentric with the through-bore 4 and into which the sliding disc 3 is inserted and fastened to the cylinder block 1 by a force and positive connection.
  • the inside diameter of the sliding washer 3 is somewhat larger than the diameter of the through bore 4, and the bores 6 run through the sliding washer 3 on the same pitch circle as the control slots 8, 9.
  • the bearing surface 17 of the sliding disk 3 facing the control body 2 is spherically convex to match the control surface 10, as is shown in the upper half of FIG. 1.
  • the above-mentioned positive connection between the sliding disc 3 and the cylinder block 1 in its embodiment according to FIG directed projection 19 and a projection 20 which overlaps this and is formed in the wall surface 21 of the depression 12 or the edge 22 of the cylinder block 1 surrounding it.
  • the form-fitting connection in its embodiment according to FIG. 3 is designated by reference numeral 23 and is formed by the wall surface 21 of the recess 12 undercut in the axial direction and the correspondingly inclined circumferential surface 18 of the sliding disk 3.
  • the aforementioned frictional connection is established by first cooling the sliding disc 3 before inserting it into the recess 12 relative to the cylinder block 1 until its largest diameter, measured for example in FIG. 2 at the height of its projection 19, is somewhat smaller than that smallest diameter of the recess 12, correspondingly measured at the height of the projection 20, and that secondly the cooled sliding disk 3 is inserted into the recess 12, in order finally to be pressed non-positively against the wall surface 21 or recess 12 when heated to operating temperature and in addition to this the form-fitting connection 19, 20 to be held at the same time.
  • the sliding disk 3 Before being inserted into the recess 12, the sliding disk 3, as shown in the lower half of FIG. 1, has a bearing surface 17 which has not yet been adapted to the control surface 10 of the control body 2; the necessary adjustment is made by machining the bearing surface 17 as soon as the sliding disc 3 inserted into the recess 12 is sufficiently fixed within the recess 12 by appropriate thermal expansion.
  • the aforementioned relief duct arrangement 15 comprises two annular relief grooves 24, 25, eight radially extending, evenly distributed relief grooves 26 and eight likewise radially extending relief ducts 27. All relief grooves 24 to 26 are formed in the inner surface 13 of the sliding disk 3, while the relief ducts 27 run through the edge 22 of the cylinder block 1.
  • the two annular relief grooves 24, 25 are arranged with different diameters concentrically to the through hole 4.
  • the radial relief grooves 26 connect the annular relief grooves 24, 25, extend up to Circumferential surface 18 of the sliding disc 3 and open out on the lateral surface 28 of the cylinder block 1 via the adjoining radial relief channels 27.
  • the relief channel arrangement 16 shown in FIG. 7 also includes the annular relief grooves 24, 25, the radial relief grooves 26 and instead of the relief channels 27, eight relief groove sections 29, which are formed in the peripheral surface 18 of the sliding disk 3 and, in continuation of the relief grooves 26, extend axially to the mouth the bearing surface 17 of the sliding washer 3.
  • the leakage oil that emerges during operation of the axial piston machine from the bores 6, which are connected to the pressure connection, is loaded with the high pressure and flows in between the sliding disk 3 and the cylinder block 1, and is discharged outside the cylinder block 1 via the relief channel arrangement 15 or 16.
  • Both relief channel arrangements 15, 16 each have such a total cross-sectional area and distribution that the resultant relief of the pressure medium results in high-sealing surface areas 30 of metallic contact between the sliding disc 3 and the cylinder block 1.
  • the slide washer 3 shown in FIG. 4 is fixed in the recess 12 only by means of three head screws 31, which are arranged at uniform intervals on a pitch circle, in a non-positive and positive manner.
  • Each cap screw 31 passes through a stepped bore 32 in the sliding washer 3 and is screwed into a threaded blind bore 33 formed in the cylinder block 1.
  • the rotational lock of the frictional connection taken over in the exemplary embodiment according to FIG. 1 due to the thermal expansion of the sliding washer is taken over by the three cap screws 31 in the exemplary embodiment according to FIG.
  • the slide washer 3 according to FIG. 5 is held in the recess 12 by the positive connection 19, 20 or 23 according to FIG. 1 and is secured against rotation by a bolt 36 inserted into a blind bore 34, 35 in the slide washer 3 or in the cylinder block 1.
  • An alternative anti-rotation device comprises three recesses 37 formed with uniform mutual distances in the wall surface 21 of the recess 12 and lugs 38 which engage in these recesses and which project from the peripheral surface 18 of the sliding disk 3.
  • FIG. 8 shows a further anti-rotation lock of the sliding disk 3, which comprises a toothing 39 formed in its peripheral surface 18 and a toothing 40 in engagement with it in the wall surface 21 as well as the relief channel arrangement 16 according to FIG.
  • the sliding disk 41 shown in FIG. 9 is not fastened to the cylinder block 1 but to the control body 2. Accordingly, its surface facing the cylinder block 1 represents the control surface 10 of the control body 2 and is consequently spherically convex, while the end face 7 of the cylinder block 1 is spherically concave. Otherwise, the sliding washer 41 is identical to the sliding washer 3 and, like this, has the relief channel arrangement 15 or 16. In the side of the control body 2 facing the cylinder block 1, an annular recess corresponding to the recess 12 in the cylinder block 1 and concentric with the through-bore 11 is formed, in which the slide washer 41 is inserted and in the same way as in FIG. 1 by the frictional connection due to the thermal expansion and is fixed by the positive connection 19, 20 and 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
EP95115242A 1994-10-19 1995-09-27 Machine hydrostatique à pistons axiaux avec une plaque de glissement Expired - Lifetime EP0708242B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9416848U 1994-10-19
DE9416848U DE9416848U1 (de) 1994-10-19 1994-10-19 Hydrostatische Axialkolbenmaschine mit einem mittels einer Gleitscheibe aus Lagermaterial drehgelagerten Zylinderblock

Publications (2)

Publication Number Publication Date
EP0708242A1 true EP0708242A1 (fr) 1996-04-24
EP0708242B1 EP0708242B1 (fr) 1997-07-23

Family

ID=6915096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95115242A Expired - Lifetime EP0708242B1 (fr) 1994-10-19 1995-09-27 Machine hydrostatique à pistons axiaux avec une plaque de glissement

Country Status (2)

Country Link
EP (1) EP0708242B1 (fr)
DE (2) DE9416848U1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019135086A1 (de) * 2019-12-19 2021-06-24 Danfoss A/S Ventilplattenanordnung
WO2021126828A1 (fr) * 2019-12-16 2021-06-24 Ocean Pacific Technologies Pompes à pistons axiaux rotatifs et composants dotés d'interfaces de surface coulissante en céramique

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1474628A (fr) * 1966-04-06 1967-03-24 Lucas Industries Ltd Procédé pour monter un élément en carbone dans un corps métallique et ses applications en particulier aux pompes et moteurs hydrauliques
DE2237418A1 (de) 1971-07-30 1973-02-08 Coussinets Ste Indle Zylinderblock fuer pumpen
DE2235345A1 (de) * 1972-07-19 1974-02-07 Hohenzollern Huettenverwalt Maschinenteil mit einer gleitauflage sowie verfahren zur herstellung desselben
DE2401499A1 (de) * 1973-03-05 1974-09-19 Deere & Co Hydrostatische vorrichtung mit einem in einer kammer eines gehaeuses angeordneten und mit einer welle verbundenen zylinderblock
US3910587A (en) * 1974-08-02 1975-10-07 Universal Eng Face seal structure
DE2431254A1 (de) 1974-06-28 1976-01-08 Linde Ag Verfahren zum aufbringen einer gleitmetallschicht auf die steuerschiebergleitflaeche einer hydrokolbenmaschine
EP0661451A1 (fr) * 1993-12-08 1995-07-05 Danfoss A/S Plaque de commande pour une machine hydraulique à piston

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1474628A (fr) * 1966-04-06 1967-03-24 Lucas Industries Ltd Procédé pour monter un élément en carbone dans un corps métallique et ses applications en particulier aux pompes et moteurs hydrauliques
DE2237418A1 (de) 1971-07-30 1973-02-08 Coussinets Ste Indle Zylinderblock fuer pumpen
DE2235345A1 (de) * 1972-07-19 1974-02-07 Hohenzollern Huettenverwalt Maschinenteil mit einer gleitauflage sowie verfahren zur herstellung desselben
DE2401499A1 (de) * 1973-03-05 1974-09-19 Deere & Co Hydrostatische vorrichtung mit einem in einer kammer eines gehaeuses angeordneten und mit einer welle verbundenen zylinderblock
DE2431254A1 (de) 1974-06-28 1976-01-08 Linde Ag Verfahren zum aufbringen einer gleitmetallschicht auf die steuerschiebergleitflaeche einer hydrokolbenmaschine
US3910587A (en) * 1974-08-02 1975-10-07 Universal Eng Face seal structure
EP0661451A1 (fr) * 1993-12-08 1995-07-05 Danfoss A/S Plaque de commande pour une machine hydraulique à piston

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021126828A1 (fr) * 2019-12-16 2021-06-24 Ocean Pacific Technologies Pompes à pistons axiaux rotatifs et composants dotés d'interfaces de surface coulissante en céramique
DE102019135086A1 (de) * 2019-12-19 2021-06-24 Danfoss A/S Ventilplattenanordnung
US11555488B2 (en) 2019-12-19 2023-01-17 Danfoss A/S Valve plate assembly

Also Published As

Publication number Publication date
DE9416848U1 (de) 1995-01-12
EP0708242B1 (fr) 1997-07-23
DE59500418D1 (de) 1997-08-28

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