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WO1996041953A1 - Machine hydraulique a piston - Google Patents

Machine hydraulique a piston Download PDF

Info

Publication number
WO1996041953A1
WO1996041953A1 PCT/DK1996/000240 DK9600240W WO9641953A1 WO 1996041953 A1 WO1996041953 A1 WO 1996041953A1 DK 9600240 W DK9600240 W DK 9600240W WO 9641953 A1 WO9641953 A1 WO 9641953A1
Authority
WO
WIPO (PCT)
Prior art keywords
bushing
cylinder
basic body
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.)
Ceased
Application number
PCT/DK1996/000240
Other languages
English (en)
Inventor
Ove Thorbøl 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
Priority to DE69624481T priority Critical patent/DE69624481D1/de
Priority to AT96918617T priority patent/ATE226690T1/de
Priority to EP96918617A priority patent/EP0832356B1/fr
Priority to DK96918617T priority patent/DK0832356T3/da
Publication of WO1996041953A1 publication Critical patent/WO1996041953A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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 having arranged in a basic body at least one cylinder in which a bushing made of a plastics material is arranged.
  • DE 43 01 126 Al From DE 43 01 126 Al it is known to make a groove on the outer wall of the bushing which is brought into register with a corresponding groove on the inner wall of the cylinder. A locking element then engages positively in the groove space formed by the two grooves.
  • DE 43 01 124 Al discloses another method, in which the cylinder bushing is heated at one end and then deformed. The cylinder has a corresponding deformation so that the bushing sits in the basic body like a rivet.
  • 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 - 3 - 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)

Abstract

L'invention porte sur une machine hydraulique à piston comportant un corps (1) contenant au moins un cylindre (2) où se trouve logé un palier plastique. La fixation du palier dans le corps peut éventuellement poser des problèmes compliquant la fabrication de la machine que ladite invention tente au contraire de simplifier. Dans ce but, le diamètre extérieur du palier (3) et le diamètre intérieur du cylindre (2) sont appariés de manière à assurer un jeu, tandis que le matériau plastique présente un module d'élasticité sensiblement inférieur à celui du corps.
PCT/DK1996/000240 1995-06-10 1996-06-06 Machine hydraulique a piston Ceased WO1996041953A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69624481T DE69624481D1 (de) 1995-06-10 1996-06-06 Hydraulische kolbenmaschine
AT96918617T ATE226690T1 (de) 1995-06-10 1996-06-06 Hydraulische kolbenmaschine
EP96918617A EP0832356B1 (fr) 1995-06-10 1996-06-06 Machine hydraulique a piston
DK96918617T DK0832356T3 (da) 1995-06-10 1996-06-06 Hydraulisk stempelmaskine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19521259.2 1995-06-10
DE19521259A DE19521259C2 (de) 1995-06-10 1995-06-10 Hydraulische Kolbenmaschine

Publications (1)

Publication Number Publication Date
WO1996041953A1 true WO1996041953A1 (fr) 1996-12-27

Family

ID=7764132

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1996/000240 Ceased WO1996041953A1 (fr) 1995-06-10 1996-06-06 Machine hydraulique a piston

Country Status (5)

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

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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301126C2 (de) * 1993-01-18 1995-05-24 Danfoss As Verfahren zum Montieren einer Laufbuchse in einem Grundkörper einer hydraulischen Maschine und hydraulische Maschine

Family Cites Families (2)

* 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
DE4301124C2 (de) * 1993-01-18 1996-10-17 Danfoss As Verfahren zum Verbinden einer Zylinderbuchse mit einem Grundkörper

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301126C2 (de) * 1993-01-18 1995-05-24 Danfoss As Verfahren zum Montieren einer Laufbuchse in einem Grundkörper einer hydraulischen Maschine und hydraulische Maschine

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
DE19521259A1 (de) 1996-12-12
EP0832356B1 (fr) 2002-10-23
EP0832356A1 (fr) 1998-04-01
DE19521259C2 (de) 1998-11-05
DK0832356T3 (da) 2003-01-27

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