EP0832356B1 - Hydraulische kolbenmaschine - Google Patents

Hydraulische kolbenmaschine Download PDF

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Publication number
EP0832356B1
EP0832356B1 EP96918617A EP96918617A EP0832356B1 EP 0832356 B1 EP0832356 B1 EP 0832356B1 EP 96918617 A EP96918617 A EP 96918617A EP 96918617 A EP96918617 A EP 96918617A EP 0832356 B1 EP0832356 B1 EP 0832356B1
Authority
EP
European Patent Office
Prior art keywords
bushing
basic body
cylinder
plastics material
elasticity
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
EP96918617A
Other languages
English (en)
French (fr)
Other versions
EP0832356A1 (de
Inventor
Ove Thorböl HANSEN
Lars Martensen
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 EP0832356A1 publication Critical patent/EP0832356A1/de
Application granted granted Critical
Publication of EP0832356B1 publication Critical patent/EP0832356B1/de
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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners
    • F04B53/168—Mounting of cylinder liners in cylinders

Definitions

  • the invention relates to a hydraulic piston machine as described in the first part of claim 1.
  • the invention is based on the problem of simplifying manufacture of the hydraulic piston machine.
  • the bushing is inserted essentially only in the basic body, or more accurately, in the cylinder, or, if the bushing is very slightly oversize, it is pressed in. Since the cylinder and the bushing are matched to one another to provide freedom from play, the insertion or pressing of the bushing into the cylinder requires a certain force, because there is a certain friction between bushing and cylinder. At least the same force is also required, however, to expel the bushing from the cylinder during operation. It has been observed that the force that attempts to expel the bushing from the cylinder is dependent on the pressure inside the bushing, in other words, the pressure of the hydraulic fluid. At relatively low pressures, the friction forces between piston and bushing are relatively low.
  • the bushing is preferably connected to the basic body by a press fit.
  • a relatively large retention force between the basic body and the bushing is already achieved in this case as the bushing is being inserted, and in operation this retention force can be further increased by the hydraulic pressures occurring inside the bushing. Operational reliability of the machine is therefore further increased.
  • the modulus of elasticity of the plastics material is preferably smaller by the factor ten than that of stainless steel. With such a small modulus of elasticity even relatively small forces are sufficient to press the bushing with the necessary force against the inner wall of the cylinder. The bushing presents no great resistance to this force.
  • the bushing advantageously has a wall thickness that is less than 1.5 mm.
  • the bushing is therefore chosen to be relatively thin. This also contributes to the fact that the pressures inside the bushing, that is, in the working chamber defined by the bushing and piston, can be used more or less completely to press the bushing against the inner wall of the cylinder.
  • the bushing preferably has at one end face a circumferential projection, the front end face of which runs perpendicular to the axis of the bushing.
  • This projection serves essentially for pressing the bushing into the basic body. Even in the case of thin-walled bushings, the necessary area for force to act upon is then available. Because the front end face runs perpendicular to the axis of the bushing, the pressing-in force can be applied by way of this end face without risk that the diameter of the bushing will change or that the bushing will be deformed in an undesirable manner.
  • Figure 1 shows merely a fragmentary view of a basic body 1 of a hydraulic machine.
  • the basic body 1 can be formed, for example, by the cylinder drum.
  • the basic body 1 has at least one cylinder 2 which can be formed, for example, by a continuous bore.
  • the cylinder 2 could, of course, also be produced in a different way as the basic body 1 is being made.
  • In the cylinder 2 there is a bushing 3 in which a piston 4 is movable back and forth.
  • the bushing 3 is formed from a plastics material which co-operates with the material of the piston 4 to produce little friction.
  • Materials from the group of high-strength thermoplastic plastics materials based on polyarylether ketones, in particular polyether ether ketones, polyamides, polyacetals, polyaryl ethers, polyethylene terephthalates, polyphenylene sulphides, polysulphones, polyether sulphones, polyether imides, polyamideimide, polyacrylates, phenol resins, such as novolak resins, or similar substances can be used as the plastics material for the bushing; glass, graphite, polytetrafluoroethylene or carbon, especially in fibre form, can be used as fillers.
  • the modulus of elasticity should be smaller than that of stainless steel by about the factor 10. At any rate, it must be substantially smaller than the modulus of elasticity of the basic body 1.
  • the wall thickness of the bushing 3 is relatively small. It is less than 1.5 mm. In the present embodiment it has a thickness of about 0.7 mm.
  • the bushing At its leading end the bushing has a circumferential projection 5, the front end face 6 of which runs perpendicular to the axis of the bushing 3.
  • the axis corresponds to the direction in which the piston 4 moves back and forth.
  • the external diameter of the bushing 3 and the internal diameter of the cylinder 2 are matched to one another in such a manner that the two parts fit together free from play. An even better retention force is achieved if the bushing 3 and the basic body 1 are connected to one another with a press fit.
  • the external diameter of the bushing 3 is slightly (1/100 - 1/10) larger than the internal diameter of the cylinder 2.
  • the end face 6 of the projection 5 serves as a means whereby even a relatively thin bushing 3 can be pressed into the cylinder 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)

Claims (5)

  1. Hydraulische Kolbenmaschine mit mindestens einem in einem Grundkörper (1) angeordneten Zylinder (2), in dem eine Laufbuchse (3) aus einem Kunststoff angeordnet ist, wobei der Außendurchmesser der Laufbuchse (3) und der Innendurchmesser des Zylinders (2) spielfrei aufeinander abgestimmt sind und der Kunststoff ein wesentlich kleineres Elastizitätsmodul als der Grundkörper (1) aufweist, so daß Haltekräfte, die die Buchse (3) in dem Grundkörper (1) halten, an die Kräfte angepaßt sind, die wirken, um die Buchse (3) aus dem Grundkörper (1) herauszutreiben, dadurch gekennzeichnet, daß die Passung so ist, daß die Buchse (3) im Grundkörper (1) gegen das Heraustreiben aus dem Zylinder (2) nur durch Reibungskräfte gehalten ist.
  2. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß die Laufbuchse (3) über eine Preßpassung mit dem Grundkörper (1) verbunden ist.
  3. Maschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Elastizitätsmodul des Kunststoffs etwa um den Faktor 10 kleiner ist als der von nicht rostendem Stahl.
  4. Maschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Laufbuchse (3) eine Wandstärke aufweist, die kleiner als 1,5 mm ist.
  5. Maschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Laufbuche (3) an einer Stirnseite einen umlaufenden Vorsprung (5) aufweist, dessen stirnseitige Endfläche (6) senkrecht zur Achse der Laufbuchse verläuft.
EP96918617A 1995-06-10 1996-06-06 Hydraulische kolbenmaschine Expired - Lifetime EP0832356B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19521259A DE19521259C2 (de) 1995-06-10 1995-06-10 Hydraulische Kolbenmaschine
DE19521259 1995-06-10
PCT/DK1996/000240 WO1996041953A1 (en) 1995-06-10 1996-06-06 Hydraulic piston machine

Publications (2)

Publication Number Publication Date
EP0832356A1 EP0832356A1 (de) 1998-04-01
EP0832356B1 true EP0832356B1 (de) 2002-10-23

Family

ID=7764132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96918617A Expired - Lifetime EP0832356B1 (de) 1995-06-10 1996-06-06 Hydraulische kolbenmaschine

Country Status (5)

Country Link
EP (1) EP0832356B1 (de)
AT (1) ATE226690T1 (de)
DE (2) DE19521259C2 (de)
DK (1) DK0832356T3 (de)
WO (1) WO1996041953A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9915248B2 (en) 2009-12-03 2018-03-13 Danfoss A/S Hydraulic piston machine, in particular water hydraulic machine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19800500A1 (de) * 1998-01-09 1999-07-15 Bosch Gmbh Robert Kolbenpumpe
DE10023849B4 (de) * 2000-05-16 2005-11-17 Brueninghaus Hydromatik Gmbh Kolbenmaschine mit in Führungsbuchsen einer Zylindertrommel verschiebbar gelagerten Kolben und Führungsbuchse für eine solche Kolbenmaschine
CN101839236B (zh) * 2009-03-21 2012-10-24 黄石东贝电器股份有限公司 嵌入缸孔式气缸座
CN102251954A (zh) * 2011-07-07 2011-11-23 广州万宝集团压缩机有限公司 电冰箱压缩机用的分体式汽缸座
CN102251949A (zh) * 2011-07-07 2011-11-23 广州万宝集团压缩机有限公司 电冰箱压缩机分体式汽缸座的镶嵌件系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234746A1 (de) * 1992-10-15 1994-04-21 Braun Ag Pumpe für Haushaltsgeräte
DE4301126C2 (de) * 1993-01-18 1995-05-24 Danfoss As Verfahren zum Montieren einer Laufbuchse in einem Grundkörper einer hydraulischen Maschine und hydraulische Maschine
DE4301124C2 (de) * 1993-01-18 1996-10-17 Danfoss As Verfahren zum Verbinden einer Zylinderbuchse mit einem Grundkörper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9915248B2 (en) 2009-12-03 2018-03-13 Danfoss A/S Hydraulic piston machine, in particular water hydraulic machine

Also Published As

Publication number Publication date
DE69624481D1 (de) 2002-11-28
ATE226690T1 (de) 2002-11-15
EP0832356A1 (de) 1998-04-01
DE19521259C2 (de) 1998-11-05
DE19521259A1 (de) 1996-12-12
WO1996041953A1 (en) 1996-12-27
DK0832356T3 (da) 2003-01-27

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