WO2013144067A1 - Piston - Google Patents

Piston Download PDF

Info

Publication number
WO2013144067A1
WO2013144067A1 PCT/EP2013/056224 EP2013056224W WO2013144067A1 WO 2013144067 A1 WO2013144067 A1 WO 2013144067A1 EP 2013056224 W EP2013056224 W EP 2013056224W WO 2013144067 A1 WO2013144067 A1 WO 2013144067A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
piston
transition
radius
flank
Prior art date
Application number
PCT/EP2013/056224
Other languages
German (de)
English (en)
Inventor
Wolfgang Issler
Original Assignee
Mahle International 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 Mahle International Gmbh filed Critical Mahle International Gmbh
Publication of WO2013144067A1 publication Critical patent/WO2013144067A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F5/00—Piston rings, e.g. associated with piston crown
    • 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
    • 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
    • F16J9/12—Details
    • F16J9/22—Rings for preventing wear of grooves or like seatings

Definitions

  • the present invention relates generally to a machine element having a groove for receiving a e.g. axially force or pressure applied sealing ring, especially a piston for an internal combustion engine with a piston head and a piston skirt.
  • the invention also relates to an internal combustion engine equipped with such a piston and to a machining tool having a geometry of the cutting edge suitable for mounting such a groove.
  • Piston ring is provided.
  • the annular grooves usually have two groove flanks extending in the radial direction of the piston and a groove base aligned parallel to a piston axis.
  • these annular grooves are weak points on the known piston, in principle, two measures come into question to increase the strength of existing between the annular grooves ring lands. On the one hand, an axially higher and thus more stable
  • a larger fillet radius in the transition between the groove flanks and the groove bottom comes into consideration, which in turn raises two problems in principle: Firstly, the groove base diameter must be reduced on the piston so that a piston ring does not press into the radius at the transition. This causes a larger Schadvolumen behind the piston ring and a certain reduction of the annular web strength, since the annular ridge projects over a slightly larger radial depth.
  • annular grooves eg 1, 0 or 1, 2 mm height
  • the quality of processing may be affected if, for example, at the of
  • the present invention therefore deals with the problem of providing a piston of the generic type an improved or at least one alternative embodiment, which is characterized in particular by increased strength in the region of a ring portion of the piston at low height.
  • the present invention is based on the general idea of having a machine element, such as e.g. a per se known piston for a
  • Internal combustion engine having a piston head and a piston shaft and a circumferential in the region of the piston head ring portion, one in the region of
  • Ring part for receiving a piston ring arranged annular groove
  • Each annular groove has two Groove flanks and a groove base, wherein a transition from at least one groove flank is rounded in the groove bottom.
  • the transition starting at the groove flank with a larger radius now has a radius which becomes ever smaller in the direction of the groove base, so that a transition with increasing curvature, starting from the groove flank to the groove base, is created.
  • the transition between groove flank and groove base is thus carried out with a rounding, the curvature of which increases from the groove flank to the groove base, either for example in a continuous radius curve (ideally corresponding to a clothoid or a logarithmic spiral) or simplified by the combination of at least two different radii, namely a first radius at the groove edge merging into a second, smaller radius at the groove bottom.
  • this geometry according to the invention is preferably provided for the annular land adjacent annular groove, but can also be used in other annular grooves.
  • the transition has at least two different radii, namely a first radius on the groove flank merging into a second radius on the groove base, wherein the first radius is greater than the second radius and in particular in a ratio of about 5 , 2 to 1 stands.
  • Ringstegs can be increased accordingly, without this being the case
  • the transition from at least one groove flank into the groove base is designed in the manner of a logarithmic spiral.
  • a logarithmic spiral is a spiral that, with each revolution, reverses the distance from its center, the pole the same factor is increased or decreased. Every straight line through the pole always intersects the logarithmic spiral at the same angle, which is why we also speak of an equiangular spiral.
  • the transition may also be designed in the manner of a clothoid, wherein the clothoid represents a special plane curve, the curvature of which increases linearly and is therefore used in particular in road construction.
  • the logarithmic spiral and the clothoids have a larger radius in the region of the groove flank and a smaller radius in the region of the groove base, and thus a greater curvature.
  • the adjacent surface regions each adjoin one another tangentially or without kinks from the groove flank via the first and the second radius or the section with the continuously increasing curvature to the groove base, thereby avoiding stress concentrations in the region of the boundaries between the individual surface regions ,
  • the upper transition may be formed in such a rounded, but the training at the lower transition for the strength of the annular land is particularly important, since the piston ring is supported here under the effect of the combustion pressure.
  • the upper transition can also be provided in the known manner with a simple radius of curvature between groove flank and groove base.
  • This fillet radius may be between the values of the radii of curvature appearing in the lower transition, equal to one occurring there Radii, preferably equal to the existing smaller groove bottom
  • Radius of curvature or have an even smaller value. In a preferred embodiment, it is selected such that the beginning of the radius on the groove flank is at the same radial position as on the opposite groove flank configured with the curvature profile according to the invention. This provides a substantial compensation for the cutting of the groove, e.g. by acting on the groove edges on the cutting tool acting axial forces and prevents lateral or axial deflection of the tool.
  • the groove flanks extend at right angles to the piston axis, while a straight portion at the groove bottom of a
  • Cylinder surface around the piston axis corresponds.
  • the groove flanks and the groove base can also be aligned at different angles to the piston axis and accordingly have frustoconical surfaces.
  • the fillet according to the invention is also applicable to grooves in which the
  • Groove edges and the groove bottom do not include a right angle, as it is e.g. in grooves for receiving trapezoidal rings is the case.
  • FIG. 1 is a sectional view through a possible embodiment of a piston according to the invention
  • FIG. 2 is a detailed view of a transition between a groove flank and a groove bottom of an annular groove and a suitable for attaching the groove cutting tool
  • FIG. 3 is a view as in Fig. 2, but with a transition in the manner of a clothoid
  • Fig. 4 is a view as in Fig. 2, but with a transition in the manner of a logarithmic spiral.
  • an inventive piston 1 for a non-illustrated internal combustion engine has a piston head 2 and a
  • Piston shaft 3 wherein the piston head 2 has a circumferential ring portion 4 and in the region of this ring portion 4 at least one annular groove 5 for receiving a piston ring 6.
  • the annular groove 5 has in a known manner two groove flanks 7 and 7 'and a groove bottom 8, which connects the two groove flanks 7 and 7' with each other.
  • a transition 9 of at least one groove flank 7, 7 ' is now rounded into the groove base 8, a curvature of this transition 9 increasing starting from the groove flank 7, 7' towards the groove base 8.
  • transition 9 is preferably formed at a lower transition 9, that is, on a side facing away from the piston head 2 with increasing curvature, of course, both transitions 9, that is both the
  • Transition between the groove flank 7 and the groove bottom 8 and the transition 9 between the groove flank 7 'and the groove bottom 8 may be formed with increasing curvature.
  • the inventively designed annular groove 5 can also be applied to other components.
  • the two groove flanks 7, 7 'and a groove bottom 8 has, at least one transition 9 of one of the groove flanks 7,7' rounded in the groove bottom 8 and a
  • Curvature of the transition 9 increases starting from the groove flank 7, 7 'towards the groove bottom 8.
  • the increasing curvature in the region of the transition 9 can be realized in different ways:
  • the transition 9 has at least two different radii Ri and R 2 , namely a first radius R 1 on the groove flank 7 merging into a second radius R 2 on the groove bottom 8, wherein the first radius R 1 is greater than that second radius R 2 .
  • the previous design of the transition with a constant radius of curvature is represented by Ro and an interrupted transition 9.
  • the first radius Ri and the second radius R2 have a ratio of approximately 2: 1 to 8: 1, preferably even of approximately 5.2: 1.
  • Such a ratio of the two radii R1 and R2 is shown in FIG. 2
  • Ringsteges 10 can be increased significantly without the
  • a further embodiment of the transition 9 according to the invention with increasing curvature can be realized, for example, in that the transition 9 of at least one groove flank 7, 7 'into the groove base 8 in the manner of a logarithmic spiral LS (see FIG a clothoid K (see Fig. 3) is formed.
  • a logarithmic spiral LS With each revolution, a distance from its center, the pole, increases by the same factor.
  • the logarithmic spiral LS wraps around the pole with decreasing radius, whereby each straight line through the pole always intersects the logarithmic spiral LS at the same angle.
  • the curvature increases linearly. Both embodiments is thus common in the direction of the groove bottom 8 increasing curvature.
  • annular groove 5 can be arranged adjacent to a top land 13 of the piston 1, it being understood that all other annular grooves 5 can be machined in the same way.
  • Ring section 4 may also be arranged a cooling channel 14 for cooling the piston 1, wherein the piston 1, for example, as
  • Light metal piston in particular as aluminum piston, may be formed.
  • the annular groove 5 according to the invention can in this case in the base material of the piston 1 or in an attached thereto, e.g. cast ring carrier may be formed of a different resilient material.
  • the invention is also in piston 1 of other materials, such as. Steel piston applicable.
  • the distance between the two groove flanks 7 and 7 ' may be constant or may decrease continuously towards the groove bottom 8.
  • transition 9 is not only an increased load capacity of the piston 1 in particular at the annular webs 10, 10 ', 10 "reachable, but it is also possible in particular to form the cylindrical portion 12 at the groove bottom 8 comparatively wide, that is significantly wider as in conventionally rounded transitions, so that in principle a cutting tool 1 1, such as a turning tool, can be used, which cuts only one transition 9 per annular groove 5 according to the invention, without this having to be feared that the cutting blade 1 1 from its cutting plane
  • a cutting tool 1 1 can be used, which at the same time both transitions 9 with mirrored

Landscapes

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

Abstract

L'invention concerne un élément structural, en particulier un piston (1) pour un moteur à combustion interne, comprenant une tête de piston (2) et une tige de piston (3), la tête de piston (2) présentant une partie annulaire périphérique et, dans la zone de la partie annulaire (4), au moins une rainure annulaire (5) pour le logement d'un segment de piston (6), qui possède deux flancs de rainure (7, 7') et un fond de rainure (8). L'invention est caractérisée en ce qu'au moins une des transitions (9) entre l'un des flancs de rainure (7, 7') et le fond de rainure (8) est arrondie, et en ce qu'une courbure de la transition (9) s'accroît à partir du flanc de rainure (7, 7') jusqu'au fond de rainure (8). Par ce moyen, un piston chargeable (1) peut être fabriqué sans modification d'une zone cylindrique (12) au fond de rainure (8).
PCT/EP2013/056224 2012-03-26 2013-03-25 Piston WO2013144067A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210204770 DE102012204770A1 (de) 2012-03-26 2012-03-26 Kolben
DE102012204770.0 2012-03-26

Publications (1)

Publication Number Publication Date
WO2013144067A1 true WO2013144067A1 (fr) 2013-10-03

Family

ID=47988988

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/056224 WO2013144067A1 (fr) 2012-03-26 2013-03-25 Piston

Country Status (2)

Country Link
DE (1) DE102012204770A1 (fr)
WO (1) WO2013144067A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017215834A1 (de) * 2017-09-07 2019-03-07 Mahle International Gmbh Kolben
DE102020200153A1 (de) * 2020-01-08 2021-07-08 Mahle International Gmbh Verfahren zur Bearbeitung einer Ringnut
DE102021207405A1 (de) 2021-07-13 2023-01-19 Federal-Mogul Nürnberg GmbH Stahlkolben für einen Verbrennungsmotor
DE102021208696A1 (de) 2021-08-10 2023-02-16 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3928491A1 (de) * 1989-08-29 1991-03-07 Mahle Gmbh Oelringnut eines tauchkolbens fuer verbrennungsmotoren
JP2009228685A (ja) * 2008-03-19 2009-10-08 Teikoku Piston Ring Co Ltd 板バネ付きピストンリング及びピストンとピストンリングの組合せ
DE102009027647A1 (de) * 2009-07-13 2011-01-20 Federal-Mogul Nürnberg GmbH Verfahren und Vorrichtung zur Bearbeitung eines Kolbens für einen Verbrennungsmotor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19833825C1 (de) * 1998-07-28 1999-12-16 Man B & W Diesel Ag Kolben für eine Hubkolbenbrennkraftmaschine
DE10118910B4 (de) * 2001-04-19 2010-04-22 Man Diesel Se Kolbenringanordnung
DE10127172B4 (de) * 2001-06-05 2005-07-21 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor
JP2008115825A (ja) * 2006-11-08 2008-05-22 Yamaha Motor Co Ltd 内燃機関およびそれを備えた車両

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3928491A1 (de) * 1989-08-29 1991-03-07 Mahle Gmbh Oelringnut eines tauchkolbens fuer verbrennungsmotoren
JP2009228685A (ja) * 2008-03-19 2009-10-08 Teikoku Piston Ring Co Ltd 板バネ付きピストンリング及びピストンとピストンリングの組合せ
DE102009027647A1 (de) * 2009-07-13 2011-01-20 Federal-Mogul Nürnberg GmbH Verfahren und Vorrichtung zur Bearbeitung eines Kolbens für einen Verbrennungsmotor

Also Published As

Publication number Publication date
DE102012204770A1 (de) 2013-09-26

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