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WO1997039262A1 - Segments de pistons cylindriques en spirale, destines en particulier a des pistons de type composite utilises dans des moteurs, des compresseurs ou des pompes endothermiques - Google Patents

Segments de pistons cylindriques en spirale, destines en particulier a des pistons de type composite utilises dans des moteurs, des compresseurs ou des pompes endothermiques Download PDF

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Publication number
WO1997039262A1
WO1997039262A1 PCT/EP1997/001968 EP9701968W WO9739262A1 WO 1997039262 A1 WO1997039262 A1 WO 1997039262A1 EP 9701968 W EP9701968 W EP 9701968W WO 9739262 A1 WO9739262 A1 WO 9739262A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
elastic ring
seat
turns
spiral
Prior art date
Application number
PCT/EP1997/001968
Other languages
English (en)
Inventor
Gianangelo Taschini
Original Assignee
Tecnomeccanica Treviglio Di Taschini Gianangelo
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 Tecnomeccanica Treviglio Di Taschini Gianangelo filed Critical Tecnomeccanica Treviglio Di Taschini Gianangelo
Priority to AU26999/97A priority Critical patent/AU2699997A/en
Publication of WO1997039262A1 publication Critical patent/WO1997039262A1/fr

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
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/04—Helical rings

Definitions

  • This invention refers to cylindrical spiral seal rings, specifically for pistons of the composite or modular type for endothermic motors, compressors and pumps.
  • pistons for endothermic motors are fitted on their head with seal rings.
  • Such rings also known as “spring rings” or “spring bands” are generally made of nodular cast iron, whereas under special conditions, their typical operation mode may eventually request Cr or Mo facings on their working surfaces.
  • Said rings are open, i.e. they have a cut to interrupt them, called 'gap' or 'light gap', which is essential for the required flexibility to widen them and place them inside appropriate slots in the cylinder head.
  • Said gap should be as tiny as possible though enough to compensate thermal expansions and avoid any shrinkage that may cause piston seizure.
  • Said specific seal rings are generally associated with other rings called 'oil scrapers', whose function is to remove the lubricating oil from the cylinder during the downward stroke of the piston.
  • Said rings have steps and/or slots, either with or without centrifugal thrust springs, which make them particularly expensive.
  • Steel lamellar sealing segments are also known, as fitted on rotating shafts, which form labyrinths with the use of spirals alternatively mounted on the fixed seat and on the rotating shaft.
  • said segments are not suitable to carry out the function currently ensured by conventional spring elements. Since they are conceived for insertion in their seat by flexible deformation, they cannot offer the limit warranties required for a motor-driven application nor a suitable profile to comply with the various functions such as seal elements, oil film spreading elements, oil scraper elements from inside the cylinder. It is the object of this invention to provide piston seal rings, specifically for pistons of the composite or modular type for endothermic motors, having a higher sealing capacity with respect to conventional rings.
  • a further object is to provide seal rings suitable to execute all the functions required for conventional seal rings.
  • One more object is to provide seal rings that will not form typical blow-by channels due to their notch gap alignment.
  • - Fig. 1 shows a piston in a diametrical halfsection
  • - Fig. 2 shows a plurality of sections of a foil wound to a cylindrical spiral, whose purpose is to realize the typical conventional functions of specific piston seal rings;
  • FIG. 3 shows a partially sectioned side view of a seal ring in a preferred embodiment of the invention, with closed turns;
  • FIG. 4 shows a schematic view being similar to Fig. 3, wherein the seal ring with closed turns is mounted on a piston, this latter being represented in section;
  • FIG. 5 shows a schematic section of a piston having an elastic ring in accordance with a first possible change of the present invention
  • FIG. 6 shows a schematic section of a piston having an elastic ring in accordance with a second possible change of the present invention.
  • a piston 1 has its sealing elements 2 'packed' together, as they are formed by foils having substantially a rectangular section 3 wound to a cylindrical spiral whose outside diameter is in line with the one of a sliding chamber 4.
  • Such a spiral may consist of one-piece having a constant section or one-piece of variable form, or still of a plurality of adjacent and/or overlapping segments, each one with a specific section to comply with a specific function: compression tightness, oil spreading, oil scraper.
  • Fig. 1 shows an example of a composite or modular piston, fitted with a movable retaining plate 5 to let the seal elements 2 be placed in their appropriate slots without deformation.
  • Fig. 1 the plate 5 is shown pertaining to a cover 5A screwed on a skirt 6.
  • Said solution of assembling the seal elements 2 without deformation is preferable but it does not exclude other solutions where such elements are placed in their seats by way of their typical deformability according to the twisting direction of their section.
  • the seal element shown in detail in Fig. 2 provides better understanding of the different sections that can be performed in it, also intended as a continuous element, since the various profiles provided for the sliding contact with the cylinder can be obtained by special grinding machines on the rotating turn.
  • some turns 7 may have a slight crowning to favour an oil film;
  • other turns 8 may have sharp edges to reduce gas infiltration;
  • other turns 9 may have an inclined face profile 9A to favour oil scraping from the cylinder liner.
  • Some turns may even have some channels 10 for oil flow inside the piston, as performed by conventional oil scrapers but in a more functional manner.
  • Fig. 3 a spiral seal element with closed turns is represented, through a side view, being realized in accordance with a preferred embodiment of the present invention.
  • Said spiral seal element which is indicated as a whole with reference number 2, consists of a series of seal turns or rings, of the type already mentioned with reference to Fig. 1. As it can be noticed, however, the end portions of the spiral have a shape which is different with respect to the central portion ofthe spiral.
  • the turns 3 ' being at the two ends of the spiral have an external diameter which is smaller than the diameter of the turns 3 of the intermediate or central portion of the spiral.
  • said thickness reduction is not limited to the end rings 3 ', but it can start already from the rings 3" being adjacent to the end rings 3 '.
  • the reduced diameter portions of rings 3" defines, along with rings 3', steps being indicated with 15. Said steps 15, in the preferred embodiment of the invention, are inserted within appropriate circumferential seats being obtained in the cover 5A and/or the skirt 6 of the piston.
  • the plate 5 of the cover 5 A has a circumferential seat 16 and, similarly, a circumferential seat 17 is present in the skirt
  • Turns 3 ' and the part of reduced diameter of turns 3" therefore realize their seal action on the walls of the circumferential seats 16 and 17, i.e. onto surfaces which are part of the piston 1, instead of the wall of the chamber within which the piston is inserted.
  • turns 3 ' can be interrupted at the end of the spiral even without the necessity of flattening their surfaces, inasmuch as this would not determine substantial seal losses or passages for oil or gas blow-by.
  • steps 15, and therefore of the extreme surfaces of the spiral, within the circumferential seats 16 and/or 17 eliminates the risks of piston seizures, which in the prior art are mainly due to the entrance of the ends of the traditional open piston rings in the ports being provided in the sliding wall of the chamber where the piston is inserted.
  • a spacer 18 having preferably the shape of a closed ring, is inte ⁇ osed between said two seal elements 2.
  • the spacer 18 is provided with opposite circumferential seats 19, substantially similar to the above mentioned seats 16 and/or 17, wherein the lower step 15 of the upper seal element 2, and the upper step 15 of the lower seal element 2 are inserted.
  • each end portion of the seal ring can be realized by a sort of tubular element, wherein a reduction of the external diameter is obtained; in this way, at least two parts having a different diameter could be defined, and therefore the cited step to be inserted within the suitable seat provided in the cover and/or the skirt and/or the spacers of the piston.
  • Said embodiment can obviously be realized only in the case of composite or modular pistons, where the recess for housing the piston ring is defined in the junction point between the cover and the skirt.
  • a further possible change is that of realizing the end turns of the piston ring, and eventually the adjacent turns, so as to define a plurality of steps, in order to increase the gas tightness; it is clear that, in this case, the seat being provided in the cover and/or the skirt and/or the spacers of the piston will have a shape suitable for receiving said plurality of steps.
  • the described elastic piston ring could be used on composite or modular piston being different with respect to the piston described in Fig. 1, without departing form the idea of mounting the elastic piston ring between two components (cover and skirts) which are then reciprocally joined.
  • the piston cover instead of being screwed on the skirt as is the case of Fig. 1 , could be provided with at least one projection having an hole, within which an usual piston pin is constrained; in this way, therefore, the fixing between the cover and the skirt, with at least one piston ring according to the invention being interposed, could be realized just by means of said piston pin.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Sealing Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne des segments de pistons, destinés en particulier à des pistons composites utilisés dans des moteurs, des compresseurs ou des pompes endothermiques. Ces segments comprennent au moins une partie en spirale ayant une pluralité de tours (3), du type à insérer dans une cavité définie dans ledit piston. Au moins une extrémité de ladite partie en spirale est munie d'une partie terminale (3', 3', 15), ladite partie terminale (3', 3', 15) étant conçue pour être insérée dans un siège (16, 17, 19) qui est défini dans le piston (1), la face extérieure d'au moins une partie de ladite partie terminale (3', 3', 15) étant totalement logée à l'intérieur du dit siège (16, 17, 19).
PCT/EP1997/001968 1996-04-18 1997-04-18 Segments de pistons cylindriques en spirale, destines en particulier a des pistons de type composite utilises dans des moteurs, des compresseurs ou des pompes endothermiques WO1997039262A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU26999/97A AU2699997A (en) 1996-04-18 1997-04-18 Cylindrical spiral piston rings, in particular for pistons of the composite type, for endothermic motors, compressors and pumps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96BG000020A IT1287045B1 (it) 1996-04-18 1996-04-18 Anelli di tenuta a spirale cilindrica per pistoni particolarmente di tipo composito di motori endotermici,compressori e pompe
ITBG96A000020 1996-04-18

Publications (1)

Publication Number Publication Date
WO1997039262A1 true WO1997039262A1 (fr) 1997-10-23

Family

ID=11336438

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/001968 WO1997039262A1 (fr) 1996-04-18 1997-04-18 Segments de pistons cylindriques en spirale, destines en particulier a des pistons de type composite utilises dans des moteurs, des compresseurs ou des pompes endothermiques

Country Status (3)

Country Link
AU (1) AU2699997A (fr)
IT (1) IT1287045B1 (fr)
WO (1) WO1997039262A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130213221A1 (en) * 2012-02-17 2013-08-22 Federal-Mogul Corporation Piston ring for an internal combustion engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1767164A (en) * 1928-09-04 1930-06-24 Ahern James Leo Piston and rod packing
US2124623A (en) * 1935-10-02 1938-07-26 Matthew G Kurth Packing assembly
FR858706A (fr) * 1939-04-28 1940-12-02 Dispositif d'étanchéité pour pistons de moteurs et autres machines
DE4131386A1 (de) * 1991-09-20 1993-03-25 Bayerische Motoren Werke Ag Spiralfoermiger kolbenring

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1767164A (en) * 1928-09-04 1930-06-24 Ahern James Leo Piston and rod packing
US2124623A (en) * 1935-10-02 1938-07-26 Matthew G Kurth Packing assembly
FR858706A (fr) * 1939-04-28 1940-12-02 Dispositif d'étanchéité pour pistons de moteurs et autres machines
DE4131386A1 (de) * 1991-09-20 1993-03-25 Bayerische Motoren Werke Ag Spiralfoermiger kolbenring

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130213221A1 (en) * 2012-02-17 2013-08-22 Federal-Mogul Corporation Piston ring for an internal combustion engine
WO2013123323A1 (fr) * 2012-02-17 2013-08-22 Federal-Mogul Corporation Segment de piston pour moteur à combustion interne
KR20140123585A (ko) * 2012-02-17 2014-10-22 페더럴-모걸 코오포레이숀 내연 엔진용 피스톤 링
CN104220737A (zh) * 2012-02-17 2014-12-17 费德罗-莫格尔公司 用于内燃机的活塞环
KR102002661B1 (ko) 2012-02-17 2019-07-23 테네코 인코퍼레이티드 내연 엔진용 피스톤 링

Also Published As

Publication number Publication date
ITBG960020A1 (it) 1997-10-18
AU2699997A (en) 1997-11-07
IT1287045B1 (it) 1998-07-30

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