EP0301309B1 - Machine à pistons axiaux differentiels - Google Patents

Machine à pistons axiaux differentiels Download PDF

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Publication number
EP0301309B1
EP0301309B1 EP88111135A EP88111135A EP0301309B1 EP 0301309 B1 EP0301309 B1 EP 0301309B1 EP 88111135 A EP88111135 A EP 88111135A EP 88111135 A EP88111135 A EP 88111135A EP 0301309 B1 EP0301309 B1 EP 0301309B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
axial piston
piston machine
pressure
pistons
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
EP88111135A
Other languages
German (de)
English (en)
Other versions
EP0301309A1 (fr
Inventor
Heinz Berthold
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 Hydraulik GmbH
Original Assignee
Brueninghaus Hydraulik 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 Hydraulik GmbH filed Critical Brueninghaus Hydraulik GmbH
Publication of EP0301309A1 publication Critical patent/EP0301309A1/fr
Application granted granted Critical
Publication of EP0301309B1 publication Critical patent/EP0301309B1/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
    • F04B5/00—Machines or pumps with differential-surface pistons
    • 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
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons

Definitions

  • the invention relates to an axial piston machine according to the preamble of claim 1.
  • swash plate axial piston pumps that is to say those with a fixed cylinder, have become known with one-piece high and low pressure pistons and hydraulic return movement of the pistons in contact with the swash plate.
  • the rear sides of the low-pressure piston parts are connected to a common overflow space, this overflow space being connected to the low-pressure cylinder via pressure valves and to the high-pressure cylinders via suction valves.
  • the overflow chamber is only connected to the high pressure cylinders when the high pressure pistons are in the suction stroke.
  • the feeding of pressure medium into the overflow space takes place from the low pressure side through the low pressure cylinders and their pressure valves.
  • the invention has for its object to design an axial piston machine of the type mentioned in such a way that the maintenance of an overpressure adapted to the respective operating state is ensured in the second cylinder spaces for the pressure of the pistons on the swash plate and / or the cylinder drum on the control mirror.
  • the throttled connection between the first and the second cylinder spaces.
  • This not only ensures the overpressure in the second cylinder chambers through the working pressure, but also creates an overpressure depending on the respective working pressure, which results in the desired adaptation to the operating state.
  • the channel or channels creating this connection can run directly or indirectly between the first and second cylinder spaces. It is essential that the working pressure is able to spread into the second cylinder spaces and to a limited extent so that the function of the axial piston machine is not impaired.
  • the pressure of the pistons on the drive surface and / or the rotatable cylinder drum on the control mirror can be created or determined in a simple manner, depending on or adapting to the operating state or to the working pressure.
  • An additional third piston as is required in the known configuration, or a spring known per se for acting on an existing cylinder drum against the control mirror can be omitted in the configuration according to the invention.
  • the configuration according to the invention also enables relatively high speeds in pump operation.
  • the suction limit speed of axial piston pumps is mainly dependent on the size of the cylinder inlet openings and the ratio of the pitch circle diameter of the piston to the pitch circle diameter of the cylinder inlet openings.
  • the size of the cylinder inlet openings is directly proportional to the size of the cross sections of the pistons.
  • the design according to the invention makes it possible to design the cylinder inlet openings larger in relation to the cross section of the piston diameters or to reduce the aforementioned ratio in axial piston machines with a rotatable cylinder drum that can hold the pistons. As a result, the desired high speed enabled in pump operation.
  • the embodiment according to claim 6 leads to a desired centrifugal acceleration of the inflowing fluid flow during operation of the axial piston machine.
  • the essential parts of the axial piston machine are a housing 4 consisting of a cup-shaped housing part 2 and a housing cover 3, a drive shaft 5 which passes through the cup-shaped housing part 2 in the central axis 6 of the axial piston machine 1 and preferably by means of roller bearings 7 , 8 is mounted in the radial wall of the housing part 2 and in the housing cover 3, a cylinder drum 11 arranged in the housing space 9, which can be rotated about the central axis 6 by the drive shaft 5 and on the drive shaft 5 and on the control mirror 13 one on the inside of the housing cover 3 arranged control plate 14 is mounted, a plurality of pistons 15, which are arranged on a pitch circle 16 and are displaceable due to a slanted surface 17 in axial piston bores 18 of the cylinder drum 11, and control channels 19, 21 which the cylinder spaces of the cylinder drum 11 with a supply and a Connect the discharge line 23, 24.
  • the piston bores 18 are stepped bores, and the pistons 15 are stepped pistons with stepped surfaces 25, so that first cylinder spaces 22 and second cylinder spaces 26 result.
  • the second cylinder spaces 26 are connected to one another by a channel system, preferably consisting of an annular channel 27 in the cylinder drum 11 and each of these radial channel sections 26 connecting this to a second cylinder space 26, so that pressure equalization occurs for all second cylinder spaces 26 during operation of the axial piston machine 1 .
  • everyone first cylinder chamber 22 is connected to the associated second cylinder chamber 26 by a channel 29, which is formed by an axial bore section 31 and by a radial bore section 32 in each piston 15.
  • the arrangement is such that, in the lowest position of each piston 15, the radial channel sections 28 open below the step surface 25 of the piston 15 and the radial bore sections 32 open above the step surface 33 of the second cylinder spaces 26.
  • the control channels 19, 21 are formed by cylinder inlet openings 34 in the form of axial bores in the cylinder drum 11 and diametrically opposed, kidney-shaped control openings 35 in the control plate 14.
  • the cylinder inlet openings 34 are located on a pitch circle 36 which is smaller in diameter than the pitch circle 16 on which the pistons 15 are arranged.
  • the diameter ratio of the existing effective piston diameter 37 and the diameter 38 of the associated cylinder inlet opening 34 is approximately 1.5: 1 in the present exemplary embodiment.
  • the arrangement is also such that the central axes 39 of the cylinder inlet openings 34 roughly intersect the inner wall area of the first cylinder spaces 22. This results in a size ratio of the pitch circle diameter 16 of the cylinder spaces 22, 26 to the pitch circle diameter 36 of the cylinder inlet openings of approximately 1.3: 1.
  • a throttle or nozzle 42 is arranged in each channel 29, preferably in the radial bore section 32, which is dimensioned such that a pressure is established in the second cylinder spaces 26 which corresponds to approximately half the working pressure.
  • the arrangement here is such that, taking into account the forces acting on the cylinder drum 11 against the control mirror 13 and away from it, forces are coordinated with one another in such a way that the cylinder drum 11 is preferably in contact with the control mirror 13 with a low pressure, so that there is a long service life ensuring oil film between the facing surfaces of the cylinder drum 11 and the control plate 14 can form. Because of the central pressure force 43 for the cylinder drum 11, which is generated by the action of the second cylinder spaces 26, it is possible to design the cylinder inlet openings 34 (diameter 38) to be relatively large, high speeds being made possible, in particular, when the axial piston machine 1 is in pump operation.
  • nine pistons 15 are present. 2 shows both the assignment of the pistons 15 in question to the low-pressure and high-pressure sides ND, HD and the line connection 41 between the second cylinder spaces 26.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Claims (5)

1. Machine à pistons axiaux du type à plateau oblique ou à axe oblique, comportant un barillet à cylindres tournant contre une surface de commande et une commande à fentes, ainsi qu'une pluralité de pistons pouvant coulisser dans le barillet à cylindres rotatif au moyen d'une surface d'entraînement, chaque piston étant sous la forme d'un piston différentiel avec un gradin délimitant une première et une deuxième chambre du cylindre, et les deuxièmes chambres des cylindres étant reliées entre elles par au moins une conduite de jonction,
caractérisée en ce que la première chambre de cylindre (22) constituant la chambre de travail de chaque piston est en liaison permanente, par un canal de jonction (29) à effet d'étranglement, avec la deuxième chambre de cylindre (26) correspondante, ainsi qu'avec toutes les deuxièmes chambres de cylindres (26) par la conduite de jonction.
2. Machine à pistons axiaux selon la revendication 1, caractérisée en ce que, en fonctionnement, il existe dans les deuxièmes chambres des cylindres (26) une pression qui correspond à la moitié, environ, de la pression de travail.
3. Machine à pistons axiaux selon la revendication 1 ou 2, caractérisée en ce que le canal de jonction (29) s'étend dans le piston (15).
4. Machine à pistons axiaux selon la revendication 3, caractérisée en ce que le canal de jonction (29) est constitué d'une section de canal axiale et d'une section de canal radiale (31, 32).
5. Machine à pistons axiaux selon une des revendications 1 à 4, caractérisée en ce qu'un étranglement (42) est ménagé dans chaque canal de jonction (29), de préférence dans la section radiale (32) dudit canal.
EP88111135A 1987-07-29 1988-07-12 Machine à pistons axiaux differentiels Expired - Lifetime EP0301309B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3725156 1987-07-29
DE19873725156 DE3725156A1 (de) 1987-07-29 1987-07-29 Axialkolbenmaschine mit stufenkolben

Publications (2)

Publication Number Publication Date
EP0301309A1 EP0301309A1 (fr) 1989-02-01
EP0301309B1 true EP0301309B1 (fr) 1991-05-08

Family

ID=6332644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111135A Expired - Lifetime EP0301309B1 (fr) 1987-07-29 1988-07-12 Machine à pistons axiaux differentiels

Country Status (2)

Country Link
EP (1) EP0301309B1 (fr)
DE (2) DE3725156A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4037455C1 (fr) * 1990-11-24 1992-02-06 Mannesmann Rexroth Gmbh, 8770 Lohr, De
DE4341845C2 (de) * 1993-12-08 1995-09-07 Danfoss As Hydraulischer Axialkolben-Motor
DE4441449A1 (de) * 1994-11-22 1996-05-23 Rexroth Mannesmann Gmbh Hydrostatische Maschine
DE102004043745B3 (de) * 2004-09-10 2006-02-09 Danfoss A/S Hydraulische Axialkolbenmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE707462C (de) * 1938-12-02 1941-06-23 Rudolf Mueller Kolbenpumpe mit in einer Zylindertrommel im Kreise angeordneten parallelen Kolben

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577242A (en) * 1947-05-05 1951-12-04 Oilgear Co Axial type hydrodynamic machine
DE1099357B (de) * 1958-04-25 1961-02-09 Heinrich Hemme Axialkolbenpumpe mit Nieder- und Hochdruckteil
DE1213245B (de) * 1962-08-08 1966-03-24 Heinrich Hemme Taumelscheiben-Axialkolbenpumpe mit Nieder- und Hochdruckteil

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE707462C (de) * 1938-12-02 1941-06-23 Rudolf Mueller Kolbenpumpe mit in einer Zylindertrommel im Kreise angeordneten parallelen Kolben

Also Published As

Publication number Publication date
DE3725156A1 (de) 1989-02-16
DE3862704D1 (de) 1991-06-13
EP0301309A1 (fr) 1989-02-01
DE3725156C2 (fr) 1989-06-08

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