[go: up one dir, main page]

WO2007124783A1 - Ensemble cylindre et piston, et piston utilisé dans cet ensemble - Google Patents

Ensemble cylindre et piston, et piston utilisé dans cet ensemble Download PDF

Info

Publication number
WO2007124783A1
WO2007124783A1 PCT/EP2006/061877 EP2006061877W WO2007124783A1 WO 2007124783 A1 WO2007124783 A1 WO 2007124783A1 EP 2006061877 W EP2006061877 W EP 2006061877W WO 2007124783 A1 WO2007124783 A1 WO 2007124783A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
cylinder
assembly according
assembly
circumferential edge
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/EP2006/061877
Other languages
English (en)
Inventor
Bastiaan Wilgehof
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.)
Hamstra BV
Original Assignee
Hamstra BV
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 Hamstra BV filed Critical Hamstra BV
Priority to PCT/EP2006/061877 priority Critical patent/WO2007124783A1/fr
Priority to EP06754888A priority patent/EP2010804A1/fr
Publication of WO2007124783A1 publication Critical patent/WO2007124783A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F16J1/001—One-piece pistons

Definitions

  • the invention relates to an assembly of cylinder and piston, wherein the piston comprises a circumferential edge for engaging an inner surface of the cylinder.
  • the piston comprises a circumferential edge for engaging an inner surface of the cylinder.
  • the dimensions of the piston and cylinder should be such, that a tight fit between the piston and cylinder is obtained.
  • a tight fit not only may be achieved by such a close correspondence between the dimensions of the piston and cylinder, but also by means of the provision of specially designed sealing members positioned between the cylinder and piston.
  • an assembly of cylinder and piston of the type referred to above is characterised in that the circumferential edge of the piston defines a three-dimensional curve.
  • the circumferential edge of the piston basically extends in a two-dimensional manner (i.e. in a flat plane)
  • the circumferential edge now extends three-dimensionally.
  • the shape of the circumferential edge of the piston is more readily adaptable to the shape of the inner surface of the cylinder, thus mitigating the above-mentioned disadvantages.
  • the piston is defined by a cup-shaped hollow body with an open top, wherein recesses connecting to the open top are provided in the wall of the body. Due to its shape as a cup-shaped hollow body such a piston has an optimised adaptability of its circumferential edge to the shape of the inner surface of the cylinder.
  • the body is manufactured of a re- silient material, for example a resilient plastic material.
  • the body tapers from the circumferential edge in a direction away from the open top. This means, that, as seen in a cross-sectional manner, the body is widest at its top (i.e. at the circumferential edge), and gets smaller in a direction away from said open top.
  • a line contact occurs between the circumferential edge of the piston and the inner surface of the cylinder, which leads to very reproducible results in terms of fluid-tightness. Fur- ther, such an embodiment will reduce the friction (and thus wear) between the piston and cylinder.
  • the special shape of the circumferential edge of the piston in accordance with the present invention especially is advantageous, when the cylinder and piston both have a non-circular cross-section. Because of the non- uniform engagement between the inner surface of the cylinder and the circumferential edge of the piston when the cylinder and piston both have a non-circular cross-section, the three-dimensional shape of the circumferential edge of the piston still will provide the desired proper engagement along the entire circumferential edge, thus assuring a correct fluid-tight engagement between the cylinder and piston. Specifically, it is possible that the cylinder and piston both have an oval cross-section defined by two oppo- site curved ends and two opposite and substantially parallel sides connecting said curved ends. In such an embodiment the piston obtains an oblong shape which is very effective in providing the desired fluid-tight engagement.
  • each of the wall portions of the body defining said parallel sides a single recess is provided.
  • a recess preferably would have a U-shaped or V-shaped outline.
  • the present invention relates to a piston presenting all the features of the piston disclosed in the present invention and being thus constructed and evidently intended for use in the assembly in accordance with the present invention.
  • Figure 1 shows a perspective view of the assembly of cylinder and piston, in a disassembled state
  • figure 2 shows a side-elevational view of the piston according to II in figure 1
  • figure 3 shows a side-elevational view of the piston according to III in figure 1
  • figure 4 shows a frontal view of the piston ac- cording to IV in figure 1.
  • an assembly of cylinder 1 and piston 2 is illustrated in a disassembled state.
  • the cylinder 1 has an oval cross- section which is defined by two opposite curved ends 3 and two opposite and substantially parallel sides 4 connecting said curved ends 3.
  • the piston 2 also has an oval cross-section defined by two opposite curved ends 5 and two imaginary opposite and substantially parallel sides 6 con- necting said curved ends 5.
  • the piston 2 is defined by a cup-shaped hollow body 7 with an open top 8. It is noted, that "open top” is dependent upon the specific orientation of the piston 2 within the cylinder 1, and thus such an open top could face in any direction, for example downwards, sidewards etcetera.
  • each of the wall portions of the body 7 defining the (imaginary) parallel sides 6 a single recess 9 is provided.
  • these recesses 9 substantially have a U-shaped outline.
  • a piston 2 comprises a circumferential edge 10 for engaging an inner surface 11 of the cylinder 1, which circumferential edge 10 defines a three- dimensional curve.
  • a circumferential edge 10 extends along the upper edge of a first curved end 5, along the downwardly and upwardly extending slopes of a first recess 9, along the upper edge of the second curved end 5 and, finally, along the downwardly and upwardly extending slopes of the second recess 9. From figures 2 and 3 it appears, that the body 7 of the piston 2 tapers form the circumferential edge in a direction away from the open top 8.
  • the body 7 of the piston 2 is manufactured of a resilient plastic material. Be- low such a resilient body 7 an attachment member 12 may be provided (which may be rigid) for connecting thereto any exterior means not shown in detail here.
  • such means could comprise driving means for the piston 2.
  • any cross-sectional shape of the cylinder 1 with corresponding cross-sectional shape of the piston 2 could be envisaged, for example a triangular, square, rec- tangular, or other polygonal shape with or without rounded corners. Such a shape could be regular or irregular, with a corresponding shape of the piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne un ensemble cylindre (1) et piston (2) où le piston comprend un bord circonférentiel (10) pour faire contact avec une surface intérieure (11) du cylindre, lequel bord circonférentiel du piston définit une courbe tridimensionnelle. De préférence, le piston est défini par un corps creux en forme de coupe (7) dont le dessus est ouvert (8), à l'intérieur duquel des évidements communiquant avec le dessus ouvert sont présents dans la paroi du corps.
PCT/EP2006/061877 2006-04-27 2006-04-27 Ensemble cylindre et piston, et piston utilisé dans cet ensemble Ceased WO2007124783A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2006/061877 WO2007124783A1 (fr) 2006-04-27 2006-04-27 Ensemble cylindre et piston, et piston utilisé dans cet ensemble
EP06754888A EP2010804A1 (fr) 2006-04-27 2006-04-27 Ensemble cylindre et piston, et piston utilise dans cet ensemble

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/061877 WO2007124783A1 (fr) 2006-04-27 2006-04-27 Ensemble cylindre et piston, et piston utilisé dans cet ensemble

Publications (1)

Publication Number Publication Date
WO2007124783A1 true WO2007124783A1 (fr) 2007-11-08

Family

ID=37567146

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/061877 Ceased WO2007124783A1 (fr) 2006-04-27 2006-04-27 Ensemble cylindre et piston, et piston utilisé dans cet ensemble

Country Status (2)

Country Link
EP (1) EP2010804A1 (fr)
WO (1) WO2007124783A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB999971A (en) * 1961-02-08 1965-07-28 Louis Nogier A double-acting piston seal for use in a medical syringe
GB2166217A (en) * 1984-09-27 1986-04-30 Honda Motor Co Ltd Lubrication of internal combustion engine piston
GB2206391A (en) * 1987-07-04 1989-01-05 T & N Technology Ltd Bearings

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005041146A1 (de) * 2004-08-30 2006-03-02 Behr Gmbh & Co. Kg Ventil, insbesondere Drehkolbenventil, und Abgasrückführsystem mit einem solchen Ventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB999971A (en) * 1961-02-08 1965-07-28 Louis Nogier A double-acting piston seal for use in a medical syringe
GB2166217A (en) * 1984-09-27 1986-04-30 Honda Motor Co Ltd Lubrication of internal combustion engine piston
GB2206391A (en) * 1987-07-04 1989-01-05 T & N Technology Ltd Bearings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2010804A1 *

Also Published As

Publication number Publication date
EP2010804A1 (fr) 2009-01-07

Similar Documents

Publication Publication Date Title
USD902277S1 (en) Automated guided vehicle
USD597838S1 (en) Can end with recess
USD558952S1 (en) Glove pair
USD558499S1 (en) Pillow
USD611217S1 (en) Liner engaging member for a trashcan
USD604124S1 (en) Food grater
USD605566S1 (en) Automotive front grill
USD613648S1 (en) Automotive front grill
USD599051S1 (en) Multi-directional lighting fixture
USD627694S1 (en) Transmission range cylinder
USD956532S1 (en) Bracket
USD590852S1 (en) Manual welding wire feeder
USD896280S1 (en) Piston rod
USD597790S1 (en) Blender jar
USD548896S1 (en) Hay feeder
USD509341S1 (en) Embossed pastry
USD1004127S1 (en) Microfluidic slab
USD987158S1 (en) LED housing
USD1015241S1 (en) Vehicle windshield
USD590853S1 (en) Soldering controller
USD605958S1 (en) X-siding jig
USD600425S1 (en) Tiller arm
USD1061964S1 (en) Vehicle headlight
USD899217S1 (en) Multi-use handtool
USD563163S1 (en) Frying basket insert

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 06754888

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2006754888

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE