WO2019091683A1 - Piston et segment racleur d'huile en deux parties - Google Patents

Piston et segment racleur d'huile en deux parties Download PDF

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Publication number
WO2019091683A1
WO2019091683A1 PCT/EP2018/077437 EP2018077437W WO2019091683A1 WO 2019091683 A1 WO2019091683 A1 WO 2019091683A1 EP 2018077437 W EP2018077437 W EP 2018077437W WO 2019091683 A1 WO2019091683 A1 WO 2019091683A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
piston
leg
tread
groove
Prior art date
Application number
PCT/EP2018/077437
Other languages
German (de)
English (en)
Inventor
Richard Mittler
Fabian RUCH
Original Assignee
Federal-Mogul Burscheid 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 Federal-Mogul Burscheid Gmbh filed Critical Federal-Mogul Burscheid Gmbh
Publication of WO2019091683A1 publication Critical patent/WO2019091683A1/fr

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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
    • F16J9/02—L-section rings
    • 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
    • F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
    • F16J9/061—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging using metallic coiled or blade springs
    • F16J9/063—Strip or wire along the entire circumference

Definitions

  • the present invention relates to oil scraper rings for internal combustion engines, in particular two-piece oil scraper rings.
  • One of the main problems with four-stroke engines is the control and sealing of the piston-piston system of and with crankcase oil piston rings, among other things, should seal the combustion chamber as well as possible from crankcase oils, it being noted that for the friction and sealing performance of gas from the combustion chamber a certain amount of oil in the system is necessary. This amount should be kept as small as possible, but without interrupting the hydrodynamic lubricant film on the piston ring raceways. This particular ate abandonment of the oil scraper ring.
  • Oil scraper rings also referred to as oil rings, are used as 2- or 3-piece designs in internal combustion engines.
  • a ring carrier is designed with an internal spring.
  • the outer tread is defined by two symmetrically arranged webs and intervening bores.
  • a spring is placed between two rails.
  • a ⁇ labstreifring- and piston combination comprising a piston and a two-piece ⁇ labstreifring; wherein the piston has a stepped piston ring groove with a main groove and a minor groove; wherein the two-piece oil control ring comprises a base body and a spring element; wherein the base body in cross-section has a ring flank leg and a tread leg substantially perpendicular thereto; wherein the spring element is configured to exert a radial force on the base body; wherein an outer side of the turret leg forms a tread; and wherein the annular flank leg and the spring element are configured to extend into the main groove, and the tread leg is configured to at least partially lie in the minor groove when the two-piece oil control ring is mounted in the piston ring groove.
  • At least one scraper bar can be arranged on the running surface.
  • an outer surface of the at least one scraper bar may be conical.
  • oil discharge openings may be arranged on the tread leg, which extend radially from the tread through the tread leg.
  • oil drain ports may be disposed on the minor groove extending to an inside of the piston.
  • a transition between the main groove and the minor notch be provided with a chamfer or a rounding.
  • the spring element may be configured to exert an axial force on the body.
  • the spring element may be configured to press the annular flank leg against a step flank.
  • two oil control lands may be disposed on the tread of the tread leg and oil drain openings may be disposed between the two oil control rings.
  • the running surface and / or the ring flank limb may be at least partially provided with a wear protection layer
  • the basic body can have a compensating leg, which runs essentially perpendicular to the annular flank leg and which, relative to the
  • Ring flank legs is arranged axially opposite the tread leg.
  • the piston ring groove may have a counterbalancing groove axially opposed to the minor groove, and wherein the compensation leg is configured to at least partially lie in the counterbalance groove when the two-piece oil control ring is mounted in the piston ring groove.
  • a two-piece oil control ring for a piston with a stepped piston ring groove which has a main groove and a minor groove, comprising a
  • Main body and a spring element wherein the main body in cross section a Ring flank leg and a (substantially vertical) tread leg has; wherein the spring element is configured to exert a radial force on the base body; wherein an outside of the tread leg forms a tread; and wherein the ring flank leg and the spring element are configured to extend into the main groove, and the tread leg is configured to at least partially lie in the minor groove when the two-piece oil control ring is mounted in the piston ring groove.
  • At least one scraper web can be arranged on the running surface.
  • the spring element may be configured to exert an axial force on the base body.
  • two-part oil scraper ring oil drainage openings may be arranged on the tread leg, which extend from the running surface radially through the tread leg.
  • two oil control ribs may be disposed on the tread of the tread leg and the oil drain ports may be disposed between the two oil control rings.
  • the base body may have a compensation leg, which is substantially perpendicular to the ring flank leg! runs and which is arranged relative to the ring flank leg axially opposite the tread leg
  • 'Axial' and 'radial' are defined as usual by reference to the axis given by the piston ring, which coincides with the axis of the cylinder shape of the piston.
  • An axial direction is a direction parallel to this axis and a radial direction is a direction perpendicular to this axis.
  • An axial section is a section in which this axis lies in the section plane.
  • 'top' means on the combustion chamber side and, bottom 'crankcase side.
  • Fig. 1 shows a sectional view of a piston and an oil stripping rings according to a form of leadership shows
  • Fig. 2 shows a sectional view of a piston and a ⁇ labstreifrings according to another embodiment.
  • FIG. 1 shows an axial sectional illustration of a combination according to the invention of a piston 2 and a two-part oil scraper ring. Furthermore, a cylinder wall 32 is indicated.
  • the piston 2 has a stepped piston ring groove, which has a main groove 8 and a secondary groove 10, wherein the main groove extends further inwards and in the figure, the main groove 8 is arranged for example on (combustion chamber side) of the auxiliary groove 10.
  • the Kolbcnringnut is bounded radially by a groove bottom 22 and a step base 24 and axially by an upper groove flank 26, a lower groove flank 28 and a step edge 30.
  • the groove bottom 22 is the bottom of the main groove 8; the step bottom 24 is the bottom of the auxiliary groove 10.
  • the upper groove flank 26 forms the upper flank of the main groove 8; the lower groove flank 28 forms the lower flank of the minor groove 10.
  • the stepped flank 30 forms the lower flank of the main groove 8 in the region in which the main and secondary grooves do not adjoin one another.
  • step ground 24 and step flank 30 form outer surfaces of a step of the stepped annular groove.
  • oil drain holes 20 may be arranged extending to an inside of the piston.
  • the oil drain openings 20 extend outgoing from the stepped bottom 24 (as shown in Fig. 1) and / or from the lower groove flank 28 (not shown) through the piston 2 to the inside of the piston. Oil, which is stripped from the cylinder wall 32, can be directed into the crankcase. It is also possible to simultaneously provide oil drainage openings starting from the stepped base 24 and starting from the lower groove flank 28.
  • the two-piece oil scraper ring comprises a base body 4 and a spring element 6; both are ring-shaped.
  • the base body 4 has (in an axial cross-section) a ring flank legs 12 and a trough substantially perpendicular thereto turf! 14, which are also both annular and thus in the axial cross section L-shaped ig are arranged.
  • the spring mechanism 6 is configured to apply a radial force to the main body 4 so that the main body is pressed outward and a tread formed by an outer side of the tread leg 14 can be pressed against the cylinder wall 32.
  • a spring element for example, a meander spring, expander spring, tube spring or wave spring can be used.
  • the spring element 6 may be formed in the axial cross-section L-shaped, with a (shorter) tavern! of the Federclements rests against an inner side of the base body 4.
  • Base 4 and spring element 6 are configured so that, after mounting the two-piece Olabstreifrings in the stepped piston ring, ring flank legs 12 and spring element 6 are arranged in the main groove 8, while the tread leg 14 is at least partially disposed in the side groove 10.
  • the spring element 6 is at least partially disposed between the ring flank leg 12 and the upper groove flank 26 and a lower surface of the annular flank leg 12 abuts the step flank 30.
  • Ring flank legs 12 and spring element 6 are preferably designed so that their common axial height substantially equal to an axial width of the main groove 8 and thus an axial stabilization of the two-piece Olabstreifrings is achieved.
  • 'Essentially' refers to the fact that the spring element 6 and the Ringflankenschcnkel 12 only selectively (lightly) to come into contact with the upper groove edge 26 and the step edge 30 to the mobility of the Olabstreifrings in the Kolbenringnut in radial To ensure direction and in the circumferential direction.
  • the spring element 6 can be further configured to exert an axial force on the base body 4 in addition to the radial force.
  • the tread leg 14 ⁇ lableitö réelleen 18 pass through, for example in the form of holes or shooters.
  • oil which collects on the oil scraper ring running surface can be derived inwardly and from there optionally forwarded through the oil drain openings 20 in the crankcase.
  • the oil discharge ports 18 terminate at the step bottom 24; however, a course in the direction of the lower groove flank 28 or in the direction of the edge between the stepped base 24 and the lower groove flank 28 is likewise possible.
  • at least one Abslreifsteg 16 is arranged on the running surface of the base body 4. More preferably, two Abstreifstege 16 are arranged on the tread, wherein the ⁇ lableitö réelleen 18 are arranged between the two Abstreifstegen.
  • 'scraper bar' is used here not only for bars with a relative (ie in relation to an axial total height of the tread) small axial extent, but should also include Abstreifstege that extend in the axial direction over a substantial portion of the tread.
  • Abstreifstege 16 extends in Fig. 1 over about half of the tread.
  • a scraper bar can cover the entire axial height of the tread.
  • an outer surface of the at least one Abstreifsteges 16 is conical. In axial cross section, this outer surface thus extends obliquely relative to the axial direction.
  • An edge between step base 24 and step edge 30 may be provided with a chamfer or a rounding.
  • an edge between inner surfaces of the base 4 i.e. the edge between the lower surface of the annular flank leg 12 and an inner surface of the tread leg 14
  • a chamfer or a rounding which corresponds to that at the edge between step bottom 24 and step flank 30.
  • the inner surface of the tread leg preferably forms an angle of less than 90 degrees with the lower surface of the annular leg.
  • FIG. 2 shows an axial sectional representation of a combination of a piston 2 and a two-part oil scraper ring according to a further embodiment.
  • a cylinder wall 32 is again indicated.
  • the embodiment of FIG. 2 is advantageous if the verticality of the main body associated with the L-shape of the main body of the embodiment of FIG. 1 is not desired.
  • the base body 4 in addition to a ring flank leg 12 and a tread leg 14 a compensating leg 15, which also extends substantially perpendicular to the ring flank legs 12, but on the the Lauffla ' chenschenkcl 14 opposite side of the ring flank leg 12 is arranged, that is arranged relative to the annular flank leg 12 axially opposite the tread leg 14.
  • the base body 4 has approximately a T-shape (in the axial cross-section), which is substantially symmetrical and thus hardly or not vertwistet.
  • the piston ring groove in addition to a main groove 8 and a side groove 10 has a Ausretesnebennut 1 1, which is arranged opposite the side groove 10 and in which the compensating legs 15 hincinerstreckt in the assembled state.
  • the balance leg is short enough, i. axia! does not extend beyond the Fcderelement 6, can be dispensed with a Ausg! eichsnebennut.
  • the compensating leg 15 may be provided with an additional tread (not shown), e.g. a scraper bar to improve the scraper action.

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

Abstract

La présente invention concerne la combinaison d'un piston et d'un segment racleur d'huile en deux parties. Le piston comporte une gorge de segment de piston étagée comportant une gorge principale et une gorge secondaire. Le segment racleur d'huile en deux parties comprend un corps de base comportant une branche de flanc de segment et une branche de surface de contact et un élément à ressort conçu pour exercer une force radiale sur le corps de base. La branche de flanc de segment et l'élément à ressort sont conçus pour s'étendre jusque dans la gorge principale et la branche de surface de contact est conçue pour se trouver au moins en partie dans la gorge secondaire lorsque le segment racleur d'huile est monté dans la gorge de segment de piston. En outre, un segment racleur d'huile en deux parties est prévu pour un piston comportant une gorge de segment de piston étagée.
PCT/EP2018/077437 2017-11-13 2018-10-09 Piston et segment racleur d'huile en deux parties WO2019091683A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017126529.5 2017-11-13
DE102017126529.5A DE102017126529B3 (de) 2017-11-13 2017-11-13 Kolben und zweiteiliger Ölabstreifring

Publications (1)

Publication Number Publication Date
WO2019091683A1 true WO2019091683A1 (fr) 2019-05-16

Family

ID=63915238

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/077437 WO2019091683A1 (fr) 2017-11-13 2018-10-09 Piston et segment racleur d'huile en deux parties

Country Status (2)

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DE (1) DE102017126529B3 (fr)
WO (1) WO2019091683A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951732A (en) * 1959-02-27 1960-09-06 Perfect Circle Corp Piston ring
DE2122361A1 (de) * 1971-05-06 1972-11-16 Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Ölabstreifring für Hubkolbenmaschinen
US4132417A (en) * 1976-06-24 1979-01-02 Kommanditbolaget United Stirling (Sweden) Ab & Co. Pressure responsive sealing means

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1538525A (en) 1923-02-19 1925-05-19 Charles N Teetor Reciprocating mechanism
FR785993A (fr) 1934-03-12 1935-08-23 Segment de piston
US2062367A (en) 1934-12-03 1936-12-01 Ramsey Accessories Mfg Corp Piston ring
US2048258A (en) 1934-12-19 1936-07-21 William G G Godron Piston ring
US4178899A (en) 1978-09-20 1979-12-18 Harry Julich Low-friction piston

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2951732A (en) * 1959-02-27 1960-09-06 Perfect Circle Corp Piston ring
DE2122361A1 (de) * 1971-05-06 1972-11-16 Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Ölabstreifring für Hubkolbenmaschinen
US4132417A (en) * 1976-06-24 1979-01-02 Kommanditbolaget United Stirling (Sweden) Ab & Co. Pressure responsive sealing means

Also Published As

Publication number Publication date
DE102017126529B3 (de) 2019-03-07

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