WO1997001035A1 - Compresseur a piston - Google Patents

Compresseur a piston Download PDF

Info

Publication number
WO1997001035A1
WO1997001035A1 PCT/EP1996/002522 EP9602522W WO9701035A1 WO 1997001035 A1 WO1997001035 A1 WO 1997001035A1 EP 9602522 W EP9602522 W EP 9602522W WO 9701035 A1 WO9701035 A1 WO 9701035A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
bolt
seating surface
piston compressor
recess
Prior art date
Application number
PCT/EP1996/002522
Other languages
English (en)
Inventor
Helmut Andresen
Original Assignee
Danfoss Compressors 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 Danfoss Compressors Gmbh filed Critical Danfoss Compressors Gmbh
Priority to AU63022/96A priority Critical patent/AU6302296A/en
Publication of WO1997001035A1 publication Critical patent/WO1997001035A1/fr

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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
    • F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins
    • F16J1/18—Securing of gudgeon-pins

Definitions

  • the invention relates to a piston compressor, in particular for domestic refrigeration machines, having at least one cylinder, in which a piston is arranged to move axially, which piston is connected by way of a bolt to a connecting rod, the bolt being secured in the piston by means of a press fit.
  • the invention is based on the problem of improving the efficiency of a piston compressor.
  • the press fit comprises a pairing of seating surfaces which is under reduced normal stress circumferentially of the piston.
  • At least one of the seating surfaces prefferably have, compared with a basic form, a recess which is arranged transverse to the axial direction.
  • the basic form is here the form of the relevant seating surface where there is a substantially uniform normal stress distribution over the circumference of the bolt and the bore. In the region of the recess the normal stress is reduced. If the recess is suitably configured, the normal stress can even be made to disappear. At any rate, with the bolt inserted there is no need for a gap between bolt and piston to form in the region of the reces ⁇ . In the region of the recess the piston and bolt can slide on each another or bear against each other under a slight pressure or slight stress. The normal stress must be decreased only to the extent that no undesirable deformation of the piston occurs.
  • the seating surface preferably has two recesses lying opposite one another. In this manner a certain symmetry of fixing is achieved. The bolt therefore remains in the middle of the bore receiving it. •
  • the recess is preferably formed by a gradual departure of the seating surface from its basic form. This gradual departure can also be described by the expre ⁇ sion "continuously differentiable". Such a configuration has the advantage that the normal stress is not abruptly decreased to the reduced value; on the contrary, there is a stress distribution with a correspondingly gradual reduction in the normal ⁇ tress. Such a gradual departure of the seating surface from the basic form is relatively complicated to produce, however.
  • the transition between the seating surface and its recess is therefore formed by a step.
  • a recess is easier to create.
  • the step allows a certain displacement of the material of the corresponding seating surface, so that the forces occurring may lead to a deformation of the piston, but this deformation is restricted locally to the region of the step.
  • a deformation of the piston which leads to a departure from the desired circular form can be virtually ruled out.
  • the seating surface portion ⁇ in which a normal stres ⁇ sufficient to hold the bolt fixedly in the piston is present engage around the bolt in the axial direction for less than 33% of its height.
  • the piston advantageously has a bore which has an enlarged diameter circumferentially of the piston.
  • the bore therefore differs from the circular form transverse to the axial direction of the piston.
  • the recesses which lead to the desired reduction in the normal ⁇ tre ⁇ s are arranged in the region of the enlarged diameter.
  • the bolt can have a relieved area on at least one side.
  • This relieved area of the bolt can also, of course, be u ⁇ ed in conjunction with the diametral enlargement of the piston bore. The corresponding reduction in the normal stress will also occur in the region of the relieved area.
  • the relieved area can be convex, flat, or concave. It can also be formed by a recess.
  • relieved area it is in that case especially preferred for the relieved area to extend substantially parallel to the axial direction. This facilitates assembly. There is a defined ⁇ urface of the bolt which can be used for aligning the bolt during assembly.
  • the bolt in place of the relieved area, in another preferred construction provision can be made for the bolt to have a slot at at least one end. This measure too creates a region of the surface pairing having reduced normal stress.
  • the bolt is in that case somewhat more resilient, so that the risk that the piston will ⁇ uffer deformation become ⁇ less.
  • Fig. 1 is a diagrammatic side view of a piston compressor, partly in section
  • Fig. 2 is a view of a piston from direction II according to Fig. 1
  • Fig. 3 is a perspective view of a bolt
  • Fig. 4 is a perspective view of an alternative example of the bolt.
  • a piston compressor 1 as is used, for example, in hermetically encapsulated small-type refrigeration machine ⁇ for refrigerators or other domestic refrigeration appliances, has a diagrammatically illustrated cylinder 2 in which a piston 3 is arranged so a ⁇ to be movable axially, that i ⁇ , in the direction of a double arrow 4.
  • the piston 3 is connected to one end of a connecting rod 5 which effects the drive of the piston.
  • the connecting rod 5 i ⁇ connected at its other end 6 to a crank shaft, not illustrated.
  • connection between the connecting rod 5 and the piston 3 i ⁇ effected by way of a bolt 7.
  • the bolt 7 should be held non-rotatably (and, of course, also non-displaceably) in the pi ⁇ ton 3.
  • a rotation ⁇ hould therefore be effected only between the bolt 7 and the connecting rod 5, and not between the bolt 7 and the pi ⁇ ton 3.
  • the bolt 7 is held in the piston 3 by means of a press fit clamping 10.
  • the bolt 7 is driven in the direction of the arrow 8 into the piston 3, ⁇ imultaneou ⁇ ly pa ⁇ ing through the connecting rod 5.
  • this involves first of all a sliding fit 9 between piston 3 and bolt 7, and on the side of the connecting rod 5 furthest inwards in the direction of assembly 8, a press fit 10 between the bolt 7 and the piston 3.
  • This press fit 10 holds the bolt 7 fixedly in the piston 3.
  • the press fit 10 is formed by a seating surface 11 in an inner wall of a bore 12, which receives the bolt 7; the seating surface 11 co-operate ⁇ with a ⁇ eating ⁇ urface 17 (Fig. 3) on the circumference of the bolt 7.
  • the two seating surfaces 11, 17 lie against each other with a certain normal stress.
  • the seating surface 11 is interrupted, however, by two opposing recesses 13 which are arranged transverse to the axial direction 4, that is, form a diametral enlargement of the bore 12 which, viewed in the direction of the arrow II in Fig. 1, extends in the circumferentially of the piston 3.
  • the bolt 7 is circular in cross-section. It is therefore of cylindrical form.
  • the relieved area 16 can, as shown, be in the form of a flat surface. It may, however, also be convexly or concavely curved.
  • Fig. 4 how ⁇ an alternative con ⁇ truction of the bolt, in which the reference numerals for corresponding parts are the same as in Fig. 3, but provided with a prime sign.
  • the relieved area 16 is replaced by a slot 16'. Where there is no material because of the slot, it is impos ⁇ ible for normal ⁇ tress to occur.
  • the end 15' of the bolt 7' is now slightly resiliently deformable, since the two projection ⁇ defining the slot 16' are able to yield slightly radially inward ⁇ .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Compressor (AREA)

Abstract

L'invention décrit un compresseur (1) à piston, utilisé notamment pour des machines de réfrigération domestique, comportant au moins un cylindre (2), dans lequel un piston (3) se trouve en position de se déplacer axialement, lequel piston est relié au moyen d'un boulon (7) à une bielle (5), le boulon (7) étant fixé dans le piston (3) au moyen d'un ajustage serré (10). Cela est souhaitable si l'on veut améliorer le rendement du compresseur à piston. A cette fin, l'ajustage serré (10) comprend un appariement des surfaces d'appui qui se produit tout autour du piston (3), sous des contraintes normales réduites.
PCT/EP1996/002522 1995-06-23 1996-06-11 Compresseur a piston WO1997001035A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63022/96A AU6302296A (en) 1995-06-23 1996-06-11 Piston compressor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19522210.5 1995-06-23
DE1995122210 DE19522210C1 (de) 1995-06-23 1995-06-23 Kolbenverdichter

Publications (1)

Publication Number Publication Date
WO1997001035A1 true WO1997001035A1 (fr) 1997-01-09

Family

ID=7764696

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/002522 WO1997001035A1 (fr) 1995-06-23 1996-06-11 Compresseur a piston

Country Status (3)

Country Link
AU (1) AU6302296A (fr)
DE (1) DE19522210C1 (fr)
WO (1) WO1997001035A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6823769B2 (en) 2000-07-18 2004-11-30 Volvo Wheel Loaders Ab Device and method for fixing a piston or a piston rod attachment to a piston rod

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR0104001B1 (pt) 2001-07-25 2009-01-13 arranjo de montagem de pistço para compressor hermÉtico alternativo.
DE102008036999B4 (de) 2008-08-07 2012-03-29 Danfoss Household Compressors Gmbh Kältemittelkompressor, Kolben eines Kältemittelkompressors und Kolbenanordnung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2347586A1 (fr) * 1976-04-08 1977-11-04 Schmidt Gmbh Karl Axe de piston, plus particulierement pour pistons pour moteurs a combustion interne
FR2392253A1 (fr) * 1977-05-28 1978-12-22 Danfoss As Ensemble de cylindre et piston pour compresseur
EP0046142A2 (fr) * 1980-07-31 1982-02-17 INDESIT INDUSTRIA ELETTRODOMESTICI ITALIANA S.p.A. Compresseur entraîné par un moteur, particulièrement compresseur étanche appliqué aux machines réfrigérantes
WO1994004853A1 (fr) * 1992-08-11 1994-03-03 Empresa Brasileira De Compressores S/A. - Embraco Ensemble bielle-axe d'articulation-piston destine a des compresseurs hermetiques a piston

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2947457A1 (de) * 1979-11-24 1981-06-04 Robert Bosch Gmbh, 7000 Stuttgart Kolben mit kolbenbolzen
DE3600750A1 (de) * 1986-01-14 1987-07-16 Kolbenschmidt Ag Kolben und pleuel fuer brennkraftmaschinen und verdichter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2347586A1 (fr) * 1976-04-08 1977-11-04 Schmidt Gmbh Karl Axe de piston, plus particulierement pour pistons pour moteurs a combustion interne
FR2392253A1 (fr) * 1977-05-28 1978-12-22 Danfoss As Ensemble de cylindre et piston pour compresseur
EP0046142A2 (fr) * 1980-07-31 1982-02-17 INDESIT INDUSTRIA ELETTRODOMESTICI ITALIANA S.p.A. Compresseur entraîné par un moteur, particulièrement compresseur étanche appliqué aux machines réfrigérantes
WO1994004853A1 (fr) * 1992-08-11 1994-03-03 Empresa Brasileira De Compressores S/A. - Embraco Ensemble bielle-axe d'articulation-piston destine a des compresseurs hermetiques a piston

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6823769B2 (en) 2000-07-18 2004-11-30 Volvo Wheel Loaders Ab Device and method for fixing a piston or a piston rod attachment to a piston rod

Also Published As

Publication number Publication date
AU6302296A (en) 1997-01-22
DE19522210C1 (de) 1997-01-16

Similar Documents

Publication Publication Date Title
US5072655A (en) Pistons for axial piston machines
US5005808A (en) Airspring end member and airspring assembly
US6080153A (en) External fixation device
US4976574A (en) Device for connecting two tool parts
JPH09250451A (ja) 容量可変型揺動斜板式圧縮機のピストン
US5823093A (en) Liner assembly with a fluid end cylinder
JP6416105B2 (ja) 組立クランクシャフトおよび組立クランクシャフトの製造方法
US6012847A (en) Guide arrangement for hydraulic cylinders
US6454272B1 (en) Sealing arrangement and a sealing member therefor
WO1997001035A1 (fr) Compresseur a piston
US20030031504A1 (en) Connection between a rod and crosshead in a reciprocating compressor
EP0952339B1 (fr) Piston pour un compresseur en plateau en biais
US20060196353A1 (en) Reciprocating-piston machine for motor vehicles
US5752413A (en) Reciprocating piston machine with a wobble plate gear
US5499571A (en) Wrist pin - piston assembly
US6116146A (en) Radial piston machine
US4939952A (en) Connecting rod for an axial piston compressor
US5141350A (en) Pressurized drive coupling
US4890989A (en) Positive displacement machine with a plastic gate pinton
GB2223075A (en) Bolt tensioners
US5881631A (en) Connection between a piston and connecting rod of a reciprocating compressor
US6672199B2 (en) Cylinder block of an axial piston compressor with elongated cylinder face
AU2021249497A1 (en) Hydraulic piston with a depressurised recess
WO1996041953A1 (fr) Machine hydraulique a piston
JP2003501598A (ja) シール機構およびそのためのシール部材

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AM AT AU BG BR BY CA CH CN CZ DE DK EE ES FI GB GE HU IL IS JP KR KZ LT LU LV MD MK MX NO NZ PL PT RO RU SE SG SI SK TR UA US UZ VN AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA