EP3203059A1 - Chemin de roulement d'un cylindre d'un moteur alternatif - Google Patents

Chemin de roulement d'un cylindre d'un moteur alternatif Download PDF

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Publication number
EP3203059A1
EP3203059A1 EP17153819.2A EP17153819A EP3203059A1 EP 3203059 A1 EP3203059 A1 EP 3203059A1 EP 17153819 A EP17153819 A EP 17153819A EP 3203059 A1 EP3203059 A1 EP 3203059A1
Authority
EP
European Patent Office
Prior art keywords
grooves
plateau
cylinder
cylinder surface
regions
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.)
Granted
Application number
EP17153819.2A
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German (de)
English (en)
Other versions
EP3203059B1 (fr
Inventor
Paulo Urzua Torres
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.)
Volkswagen AG
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Volkswagen AG
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Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP3203059A1 publication Critical patent/EP3203059A1/fr
Application granted granted Critical
Publication of EP3203059B1 publication Critical patent/EP3203059B1/fr
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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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/20—Other cylinders characterised by constructional features providing for lubrication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/18—Lubricating

Definitions

  • the invention relates to a cylinder running surface of a cylinder of a reciprocating engine.
  • the invention has for its object to provide a cylinder surface for a reciprocating engine available, by means of which a particularly low-friction operation of a reciprocating engine is made possible.
  • An inventive cylinder running surface of a cylinder for a reciprocating engine in particular a reciprocating internal combustion engine or other Hubkolbenarbeitsmaschine, for example, a reciprocating pump, has depressions in the form of spaced apart grooves, which are formed between adjacent grooves plateaus.
  • spaced grooves is meant that viewed in the vertical direction of the cylinder surface, ie parallel to the central axis, two adjacent grooves have a distance from each other.
  • the cylinder running surface has depressions in the form of plateau grooves formed in the region of the plateaus, wherein first plateau regions are formed with a first orientation of plateau grooves and at least second plateau regions are formed with a second orientation of plateau grooves. The first orientation and the second orientation differ from each other.
  • the said grooves usually have a greater depth than the plateau grooves.
  • the invention makes use of a principle determined by simulation calculations, according to which the orientation of the grooves is decoupled from the orientation of the plateau grooves.
  • a principle determined by simulation calculations according to which the orientation of the grooves is decoupled from the orientation of the plateau grooves.
  • plateau grooves may be formed on plateaus between these grooves intersecting at a different intersecting angle and / or otherwise oriented differently, e.g. in that the central axis is pivoted in relation to the first overlapping angle.
  • the invention thus takes into account in particular the fact that in cylinders of reciprocating engines usually a reciprocating piston is guided by the cylinder surface and lubricant, in particular oil, is used to reduce friction.
  • lubricant in particular oil
  • Lubricant accumulates in the grooves and plateau grooves and is said to reduce friction by facilitating slippage of the piston on the cylinder surface by means of a lubricating film.
  • the friction in a reciprocating engine can be reduced by optimizing the plateau grooves depending on the speed of the piston in certain areas of the cylinder running surface with the aid of simulation calculations. It has been found that optimizing the orientation of the plateau grooves, which is decoupled from the orientation of the grooves, can contribute to a significant reduction in friction. Especially in the reversal areas, the orientation of the plateau grooves is of particular importance, because there the piston is moved only at a very low speed. In these areas, by means of a suitable design of the platform grooves-in particular independently of the orientation of the grooves in this area-particularly good results with regard to friction reduction can be achieved.
  • Under ridges and plateau grooves in the present case are understood in particular over the circumference of a cylinder surface and at least over a height range extending recesses, which can be produced for example by honing and at uniform rotational speed and uniform feed of the tool helically on the Cylinder tread are formed. This results in the vertical direction of the cylinder considered at each point of the circumference grooves and Plateaurillen at equal distances from each other.
  • deviating designs can also be produced, in particular undulating patterns of grooves and / or plateau grooves.
  • intersecting grooves and plateau grooves are frequently formed in practice with constant overlap angles on cylinder surfaces, at least in certain areas.
  • Simulation calculations carried out in connection with the invention were determined, in particular, on cylinder running surfaces in which plateau grooves crossing over at an overlapping angle ⁇ are formed in first plateau regions and / or in second plateau regions.
  • the angle of intersection ⁇ is understood to mean that angle which is formed in the vertical direction of the cylinder between two plateau grooves and which passes over the plane perpendicular to the central axis of the cylinder and runs through the intersection point of the plateau grooves.
  • first plateau areas and in second plateau areas different overlap angles ⁇ and / or identical overlap angles, but the plateau grooves in different orientations, can be formed to the plane perpendicular to the central axis. All variants are divergent orientations according to the invention. It has been found that with intersecting plateau grooves and / or grooves the lubricant transport between individual plateau grooves or grooves is improved and the friction is reduced. It is particularly preferred if intersecting arrangements are selected both for the grooves and for the plateau grooves, in particular by means of plateau hoists at - within a range - constant rotational speed and constant feed, so that parallelogram-shaped patterns of grooves and plateau grooves are formed.
  • plateau grooves intersecting at an overlap angle ⁇ A are formed in the first plateau regions, and plateau grooves crossing at an overlap angle ⁇ B are formed in the second plateau regions, wherein the intersecting angles are spaced apart by at least 30 °.
  • This embodiment of the invention has been made in particular in connection with plateau grooves with overlap angles, which are arranged symmetrically to planes perpendicular to the vertical direction (transverse planes). However, it is independent of this orientation feasible, ie also in conjunction with over the transverse planes twisted overlap angles. It has been found that it is preferable if the distance of the Intersecting angle to each other at least 55 ° and more preferably at least 70 °. Such a distance between the intersecting angles has proved to be advantageous in order to adapt the cylinder running surface to the frictional forces between the cylinder running surface and the reciprocating piston, which differ greatly in particular in the middle region and in the reversal regions.
  • first plateau regions are arranged in at least one reversal region of the cylinder and / or the second plateau regions are arranged in a middle region deviating from the reversal region and the plateau grooves are suitably formed in these regions, a particularly low-friction operation of a reciprocating piston engine results.
  • cylinder treads divided into a mid-range (or more mid-range) high-speed piston and lower-end reversible ranges.
  • reversal region is meant in the present case a region of a cylinder surface which at least also includes the top dead center of the first piston ring or bottom dead center of the lowermost piston ring (oil control ring) of a piston guided in the cylinder or directly adjacent to this region.
  • Such a region can be found in pistons having a plurality of piston rings, for example from the outermost piston ring, e.g. Extend over the top edge of the top piston ring of a piston with multiple piston rings at top dead center by 0.5 to 2 times the distance from the top piston ring to the bottom piston ring (oil control ring).
  • a reversal region can also be determined starting from the upper edge of the uppermost piston ring of the total stroke, for example as a maximum of 5% of the total stroke (working height H) of one of these dead centers. Due to the different speeds in the different areas, the friction changes.
  • a particularly suitable design of the platform grooves can be realized for each area, not only taking into account grooves formed in these areas, taking into account the interaction with the grooves, but also with respect to the occurring in these areas piston speeds. This is achieved particularly advantageously by the arrangement of first plateau regions with plateau grooves which intersect at an overlap angle ⁇ A , in reverse regions and by the arrangement of second plateau regions with intersecting angles ⁇ B in a middle region.
  • the cylinder surface can be optimally adapted to the design and the speed profile and to the formation of the grooves of the cylinder surface. It is particularly preferred if first Plateau areas are arranged with the same design of the plateau grooves and / or grooves both in the upper reversal region and in the lower reversal region.
  • the upper inversion area which includes the top dead center of the first piston ring or which is located near the top dead center, is preferably according to the alternative definition extending along the central axis M over a height of 2 to 10% of the total working height H of the reciprocating piston Area set.
  • the lower reversing portion which includes the bottom dead center of the lowermost piston ring (oil scraper ring) or which is located near the bottom dead center, it is preferable to have a range extending along the center axis M over a height of 5 to 20% from the bottom dead center of FIG lowest piston ring (oil scraper ring) set.
  • the middle region preferably extends over a height of 60 to 93% of the working height H between the respective turning regions.
  • plateau grooves are designed in such a way that a blunt overlapping angle ⁇ A (ie an angle between 90 ° and 180 °) in first plateau-like regions, in particular in a reversal region, and / or a sharp intersecting angle ⁇ B (ie, an angle between 0 ° and 90 °) in second plateau-like areas, especially in a central area.
  • a blunt overlapping angle ⁇ A ie an angle between 90 ° and 180 °
  • ⁇ B ie, an angle between 0 ° and 90 °
  • a preferred value range for ⁇ A is between 100 ° and 170 °, more preferably between 110 ° and 150 ° and particularly preferably between 120 ° and 140 °.
  • the overlap angle ⁇ B in a central region is preferably selected between 10 ° and 50 °, more preferably between 20 ° and 40 ° and particularly preferably between 25 ° and 35 °.
  • the decoupling already described above is particularly friction-reducing if the orientation of the plateau grooves is at least partially deviating at least in a partial region of the cylinder in comparison to the orientation of the grooves directly surrounding these plateau grooves.
  • the grooves have an area fraction of at least 20% on the entire cylinder running surface.
  • the area fraction of the grooves on the entire cylinder running surface is preferably 30% to 60%.
  • the fraction of the grooves is understood to mean the proportion of the entire cylinder running surface, which includes grooves.
  • the area fraction of the grooves is determined in particular by the number of grooves and by the width of the grooves. The larger the area fraction of the grooves, the smaller the surface area of the plateaus and thus the area available for plateau grooves. It should be noted that, instead of the area ratio, approximately the value Mr2 of an aberration curve may be used as the basis for calculating the area ratio of the grooves, the area ratio being approximately equal to (1-Mr2). In that regard, it is advantageous if a maximum of 80% is specified as the value Mr2, preferably a maximum of 70% and more preferably a maximum of 60%.
  • the area fraction of the grooves is preferably chosen between 20% and 50%.
  • both the grooves and the plateau grooves each have an acute overlap angle ⁇ or ⁇ in the middle region.
  • the overlap angle ⁇ of the grooves and the overlap angle ⁇ of the plateau grooves are the same in the middle region.
  • grooves and plateau grooves in the middle region can be produced with the same tool angle settings, except for the penetration depth.
  • a geometric design of a cylinder running surface as described above may be generated flexibly by any suitable method.
  • the grooves and / or the plateau grooves are produced by honing machining.
  • the so-called plateau honing can take place here in the form of a multi-stage honing treatment.
  • grooves having a certain depth are produced in a cylinder running surface, whereby plateaus are formed between two adjacent grooves.
  • plateau grooves are formed on the plateaus between grooves, wherein the plateau grooves also have a depth which is less than the depth of the grooves.
  • other mechanical and / or optical methods are also suitable for producing a cylinder running surface according to the invention, in particular blasting methods, etching methods and laser methods.
  • the depth and the width of the grooves and the plateau grooves can also be varied.
  • a depth of at least 1 ⁇ m has proved to be advantageous.
  • grooves and plateau grooves having different contours can be produced, for example, the grooves or the plateau grooves may have W-shaped, V-shaped, U-shaped or rectangular cross-sectional shapes. It can only be selected for grooves and Plateaurillen in different areas different cross-sectional shapes.
  • the measurement of the surface condition of cylinder surfaces can be done in particular by means of laser, profilometer or scanning probe microscope.
  • a so-called Abbott curve can be created and analyzed. Different parameters characterizing the surface are determined. About these parameters, in particular the kernel roughness R k , the reduced peak height R pk , and the reduced groove depth R vk and the Material content Mr1 so-called peaks and the material content Mr2 so-called valleys can be drawn conclusions about the surface texture. The value Mr2 represents a measure of the area fraction of the grooves. Individual values of a so-called Abbott curve can also be specified for the production of desired surface textures, in particular if the production takes place by means of plateau honing.
  • Fig. 1 is a section of a cylinder block of a reciprocating engine in the form of a reciprocating internal combustion engine 10 is shown, which can serve for example for driving a motor vehicle.
  • the cylinder block has a bore 12 for receiving and guiding a reciprocating piston, not shown, in a cylinder produced by the bore 22 on.
  • the bore 12 is surrounded by a cylinder surface 14 for the reciprocating piston.
  • FIG. 2 A rolled-out in a plane section of the cylinder surface 14 in accordance with the marked 11 in section FIG. 1 is in FIG. 2 shown.
  • these are recesses in the form of intersecting grooves 16.
  • plateaus 20 hereinafter also referred to as plateau-like surfaces
  • Recesses with intersecting plateau grooves 18 are arranged at regular intervals on these plateau-like surfaces 20.
  • the plateau grooves 18 likewise enclose parallelogram-shaped partial surfaces 26 which are superposed by the parallelogram-shaped plateau-like surfaces 20.
  • plateau grooves 18 parallelogram-shaped faces 26 is presently smaller than extending in the vertical direction of the cylinder 22 height H F of parallelogram-shaped plateau-like surfaces 20.
  • each formed by plateau grooves 18 parallelogram of at least one ridge 16 interspersed.
  • the representation according to FIG. 2 was chosen to make the formation and arrangement of the grooves 16 and the plateau grooves 18 clearly visible in a common representation.
  • the height H F is preferably a multiple of the height H T , in particular at least 3 times, at least 5 times or even at least 10 times.
  • the plateau grooves 18 are preferably arranged such that a factor between 3 and 20 results between the height H F and the height H T. Regardless of the type of surface shapes, the plateau grooves 18 are preferably arranged relative to the grooves 16 such that between the plateau grooves 18 within a plateau-like surface 20 between 10 and 1000 faces 26 are formed, preferably 15 to 500 faces and more preferably 20 to 300 faces ,
  • the intersecting grooves 16 are arranged in the transverse direction of the cylinder 22 each with an overlap angle ⁇ to each other.
  • the overlapping plateau grooves 18 on the plateau-like surfaces 20 are arranged with an overlap angle ⁇ to one another.
  • FIG. 3 shows a schematic representation of a cylinder surface 14 of a cylinder 22, the geometry of the cylinder surface 14 in cross-section after a first processing stage of a Plateauhonung (far right) and after a second processing stage of a Plateauhonung. After the second processing stage, the plateau-like surfaces 20 and the surrounding grooves 16 in the in FIG. 2 shown state. By further processing steps even smoother plateau-like surfaces 20 can be generated.
  • grooves 16 are first introduced into the cylinder surface 14 in a first processing stage, so that a uniform serrated profile with protruding toward the inside of the cylinder 22 tips 24 and 16 already formed with the desired depth grooves.
  • the grooves 16 are V-shaped in cross-section, and the ratio between the depth of the grooves 16 and the spacing of the mutually parallel grooves 16 in the cylindrical wall is selected such that a zigzag-shaped profile cross-section results after the first processing stage ,
  • the invention is not limited to this possibility.
  • any other shapes, depths and distances of the grooves 16 can be selected to each other, which may also result in other cross-sectional geometries, such as tooth-shaped geometries with flank-like flats between two adjacent grooves 16 and / or W-shaped, u- shaped or otherwise shaped grooves (not shown).
  • plateau-like surfaces 20 are generated, in which the plateau grooves 18 are formed.
  • the area fraction of the grooves 16 is understood and can be calculated. It is assumed in the example that the ratio of grooves 16 to plateaus in the in FIG. 3 illustrated linear cross-sectional area is representative of the area ratio of the entire cylinder surface. In practice, the calculation can also be made on the basis of a representative partial area or on the basis of the entire cylinder surface. In the present case, the area fraction of the grooves 16 in the region of the length L is determined. The area fraction results from the sum of the individual widths of the grooves 16 within the range divided by the length of the range L, ie (R1 + R2 + R3 / L). As width is here the point with the largest width of the groove 16 defined. R1 and R3 denote in the selected area half the width of a groove 16, whereas R2 indicates the entire width of the groove 16.
  • Fig. 4 is the cylinder surface 14 of the cylinder 22 from FIG. 1 represented as the working height H in this embodiment, the height range of the cylinder 22, over which, when intended use of the reciprocating internal combustion engine 10 shown, the reciprocating piston along the cylinder surface 14 moves up and down.
  • the cylinder tread 14 is divided into three regions A, B and C, the region A including the top dead center of the illustrated cylinder 22 and the region C including the bottom dead center of the illustrated cylinder 22.
  • the regions A and C are therefore reverse regions for the piston guided in the cylinder 22 (not shown).
  • the area B is correspondingly a middle area.
  • grooves 16 and plateau grooves 18 are formed with partially different overlap angles ⁇ and ⁇ , wherein both the grooves 16 and the plateau grooves 18 are shown only in partial areas and only schematically as straight lines.
  • the grooves 16 and plateau grooves 18 extend helically over the entire circumference of the cylinder surface 14 at a constant pitch in the respective regions A, B and C.
  • the platform grooves 18 are formed in the embodiment shown depending on the area A, B or C with different overlap angles ⁇ A , ⁇ B , ⁇ C.
  • an overlap angle ⁇ A and ⁇ C of at least 90 ° is preferably selected, preferably at least 100 ° and particularly preferably more than 110 °.
  • the overlap angle ⁇ B is preferably selected between 10 ° and 50 °, preferably between 20 ° and 10 ° and particularly preferably between 25 ° and 35 °.
  • the intersecting angles ⁇ A and ⁇ C are 120 ° and the intersecting angle ⁇ B is 30 °.
  • the grooves 16 and the plateau grooves 18 preferably have the same overlap angle ⁇ or ⁇ B in the central region B for reasons of processing technology.
  • values differing from one another may also be selected, in particular within the abovementioned value ranges.
  • FIG. 5 shows a piston 28, which is shown in a cylinder 22 shown only schematically with a cylinder surface 14 in its top dead center (top view) and in a bottom dead center (as shown).
  • On the piston 28 are arranged in the first piston ring 30, a middle piston ring 32 and a lowermost piston ring (oil scraper ring) 34 oriented to the cylinder surface 14.
  • the distance between the first piston ring 30 and the lowest piston ring 34 is indicated by Z.
  • An upper reversal region preferably extends in a region from the arrow O in the direction of the arrow A over a length of 0.5Z to 2Z.
  • a region C may also be set as the lower reversal region.
  • Such a reversal region preferably extends from the arrow U, which identifies the position of the lowermost piston ring 34 at bottom dead center by 1Z to 4Z upwards, in particular by 2Z.
  • the middle area B extends in this case between the areas A and C.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP17153819.2A 2016-02-05 2017-01-30 Surface de frottement piston/cylindre d'un moteur à piston à mouvement alternatif Active EP3203059B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016102079.6A DE102016102079A1 (de) 2016-02-05 2016-02-05 Zylinderlauffläche eines Zylinders einer Hubkolbenmaschine

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EP3203059A1 true EP3203059A1 (fr) 2017-08-09
EP3203059B1 EP3203059B1 (fr) 2020-11-18

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EP17153819.2A Active EP3203059B1 (fr) 2016-02-05 2017-01-30 Surface de frottement piston/cylindre d'un moteur à piston à mouvement alternatif

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EP (1) EP3203059B1 (fr)
CN (1) CN107061038B (fr)
DE (1) DE102016102079A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019197719A1 (fr) * 2018-04-10 2019-10-17 Mirka Ltd Procédé et appareil permettant de former un motif de rainure sur une surface cylindrique
EP3657000B1 (fr) 2018-07-26 2023-08-30 Tpr Co., Ltd. Chemise de cylindre en fonte, et moteur à combustion interne

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59196954A (ja) * 1983-04-22 1984-11-08 Riken Corp 内燃機関用シリンダおよびシリンダライナ
DE4316012A1 (de) 1993-05-13 1994-11-17 Gehring Gmbh & Co Maschf Verfahren zur Feinbearbeitung von Werkstück-Oberflächen
DE19607774A1 (de) 1996-03-01 1997-09-04 Nagel Masch Werkzeug Zylinder und Verfahren zum Honen seiner Innenflächen
DE102007032370A1 (de) 2007-07-06 2009-01-08 Elgan-Diamantwerkzeuge Gmbh & Co. Kg Verfahren zur Bearbeitung einer Innenfläche einer Bohrung in einem Werkstück, Bearbeitungsmaschine hierfür sowie Werkstück

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59201549D1 (de) * 1992-04-11 1995-04-06 Gehring Gmbh & Co Maschf Verfahren zur Feinbearbeitung von Werkstück-Oberflächen.
JP2004176556A (ja) * 2002-11-25 2004-06-24 Toyota Motor Corp 内燃機関のシリンダ
CN102278225A (zh) * 2011-07-11 2011-12-14 南京航空航天大学 一种低摩擦轴向不等角度平台珩磨气缸套

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59196954A (ja) * 1983-04-22 1984-11-08 Riken Corp 内燃機関用シリンダおよびシリンダライナ
DE4316012A1 (de) 1993-05-13 1994-11-17 Gehring Gmbh & Co Maschf Verfahren zur Feinbearbeitung von Werkstück-Oberflächen
DE19607774A1 (de) 1996-03-01 1997-09-04 Nagel Masch Werkzeug Zylinder und Verfahren zum Honen seiner Innenflächen
DE102007032370A1 (de) 2007-07-06 2009-01-08 Elgan-Diamantwerkzeuge Gmbh & Co. Kg Verfahren zur Bearbeitung einer Innenfläche einer Bohrung in einem Werkstück, Bearbeitungsmaschine hierfür sowie Werkstück

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019197719A1 (fr) * 2018-04-10 2019-10-17 Mirka Ltd Procédé et appareil permettant de former un motif de rainure sur une surface cylindrique
US20210154793A1 (en) * 2018-04-10 2021-05-27 Mirka Ltd Method and apparatus for forming a groove pattern on a cylindrical surface
US12157200B2 (en) * 2018-04-10 2024-12-03 Mirka Ltd Method and apparatus for forming a groove pattern on a cylindrical surface
EP3657000B1 (fr) 2018-07-26 2023-08-30 Tpr Co., Ltd. Chemise de cylindre en fonte, et moteur à combustion interne

Also Published As

Publication number Publication date
CN107061038A (zh) 2017-08-18
CN107061038B (zh) 2020-10-13
DE102016102079A1 (de) 2017-08-10
EP3203059B1 (fr) 2020-11-18

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