EP4144979A1 - Machine à combustion dotée d'un élément sur la paroi intérieure du cylindre permettant de racler la calamine - Google Patents

Machine à combustion dotée d'un élément sur la paroi intérieure du cylindre permettant de racler la calamine Download PDF

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Publication number
EP4144979A1
EP4144979A1 EP21000259.8A EP21000259A EP4144979A1 EP 4144979 A1 EP4144979 A1 EP 4144979A1 EP 21000259 A EP21000259 A EP 21000259A EP 4144979 A1 EP4144979 A1 EP 4144979A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
combustion engine
piston
internal combustion
cylinder liner
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.)
Withdrawn
Application number
EP21000259.8A
Other languages
German (de)
English (en)
Inventor
Thomas Hoen
Ulf Klein
Peter Hoffmann
Stephan Heeger
Thomas Werner
Thomas Brehmer
Martin Blankenhorn
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.)
Deutz AG
Original Assignee
Deutz AG
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 Deutz AG filed Critical Deutz AG
Publication of EP4144979A1 publication Critical patent/EP4144979A1/fr
Withdrawn legal-status Critical Current

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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 
    • F02F1/004—Cylinder liners
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
    • 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 
    • F02F2001/006—Cylinders; Cylinder heads  having a ring at the inside of a liner or cylinder for preventing the deposit of carbon oil particles, e.g. oil scrapers

Definitions

  • the invention relates to an internal combustion engine with an element on the inner wall of the cylinder for scraping off oil carbon.
  • annular insert which protrudes from the head side of the cylinder liner. It narrows the inner diameter of the cylinder or cylinder liner and prevents carbon from coming into contact with the inner wall of the cylinder.
  • the DE 103 21 034 B3 shows a ring-shaped design that reduces the diameter as an insert in a groove or as an insert that protrudes beyond the cylinder liner on the head side and is inserted between the liner and the cylinder head without play. This is unsuitable for a large series, since the backlash-free use places increased demands on production and assembly.
  • the object of the present invention is to avoid the disadvantages mentioned above and to create an internal combustion engine that consumes little oil and produces hardly any oil carbon, without having to accept disadvantages in terms of component rigidity.
  • an internal combustion engine of the above type having the features characterized in claims 1 and 10 an internal combustion engine and a method with at least one element on the cylinder inner wall, which is worked into the cylinder inner wall in the corresponding TDC area of the top land of the piston by machining or an embossing/printing process and approximately performs the function of a fire ring.
  • Advantageous configurations of the invention are contained in the further claims.
  • Knurls or knurls, sometimes also cords, are circumferential deviations in shape produced by means of knurling, which are embossed in a metal rotating body on the inner or outer surface. Knurls can make a workpiece easier to grip and thus prevent slipping, such as on a dumbbell handle.
  • the knurling can take various forms and can be introduced either by milling, pressing or by embossing on a lathe.
  • Knurling and cording are two related manufacturing processes from the stamping group, which is part of pressure forming. In both processes, a round workpiece is pressed against a round tool and rolled so that both rotate. The profile of the tool is transferred to the workpiece. The elevations of the tool are pressed into the surface of the workpiece. Depending on whether knurls or cords (left-right knurls, cross knurls) are created, one speaks of knurling or cords.
  • the handles or gripping surfaces of micrometers are often knurled to make them easier to grip than smooth surfaces.
  • Another application is the creation of a serrated profile for a shaft-hub connection, e.g. B. for attaching a rotor core a shaft to transmit higher torques than with a shrink connection or knurled screw.
  • knurling When knurling, a distinction is made between non-cutting knurling and cutting knurl milling. Depending on the process, the profile is pressed in with knurling wheels or milled on a knurling cutter. Special knurl milling tools can also be used on CNC lathes with driven tools in order to avoid re-clamping on other machines. Since the machining forces are lower when milling, it is mainly used for thin workpieces or on machining centers.
  • RAA knurl with axis-parallel grooves
  • RBL left-hand knurl
  • RBR right-hand knurl
  • RGE left-right knurl
  • raised tips also known as checkering
  • RGV left-right knurl
  • RKE cross knurl
  • RKV cross knurling
  • RTR circular knurling (continuous).
  • the profile angle is 90°, in special cases also 105°.
  • the knurling is arranged in the end region of the inner wall on the cylinder head side at the level of the top dead center position of the corresponding piston top land piston.
  • Pistons for reciprocating engines are mostly made of cast aluminum alloys, occasionally also of cast iron.
  • the blanks are cast in molds.
  • the pistons for high-performance turbodiesel engines are also forged to improve performance and to reduce consumption and emissions through higher ignition pressures.
  • the lateral surface, the valve pockets, the piston ring grooves and the piston pin bore are then machined.
  • Diesel pistons are subject to higher thermal and mechanical loads and therefore have to be cast in the first piston ring groove Ring carriers made of austenitic cast iron ("Niresist”) are reinforced to prevent the groove from chipping and material transfer to the ring due to micro-welding. In the case of very highly loaded pistons, brass bushings are stretched in the pin bore.
  • Another characteristic feature of the pistons of direct injection diesel engines is the bottom bowl, in which the injected fuel is swirled and mixed with the air.
  • Pistons that are subject to high thermal loads - especially racing, aircraft or turbo diesel engines - are often implemented with spray nozzles for the engine oil to cool the piston crown.
  • the piston can be provided with a circumferential oil duct or only be cooled by spraying the crown. In slow-running large engines, the piston can also be cooled by circulation cooling.
  • the medium is fed to the piston through a telescoping tube.
  • the wall thickness of pistons in petrol engines is thinner than in pistons in diesel engines, which allows higher engine speeds due to the lower weight.
  • Hard anodizing can sometimes be used in the area of the first piston ring groove to reduce wear and tear and microwelding.
  • the piston crown has partially flat pockets to accommodate the valves protruding into the combustion chamber.
  • the piston has the following functional parts: the piston head, which is in contact with the medium.
  • the piston crown is also referred to as the top land.
  • the fire bridge follows. It extends from the piston crown to the upper piston ring groove. It protects the first piston ring from overheating.
  • the ring game follows. Together with the other grooves and ring lands, the top land forms the so-called ring section. This is followed by the piston skirt or the piston skirt or the piston wall, the cylindrical component that fits into the cylinder bore with a small clearance and the piston pin with its bearing, which connects the piston to the connecting rod.
  • the piston skirt serves to guide the piston in the cylinder tube and is coated with a bonded coating on most pistons. In older designs, it often has a cast-in steel strip (control piston, “control plate”, “autothermic piston”) on the inside to control the increase in diameter when it is heated. To save weight, many high-speed four-stroke engines today have the piston skirt offset inwards on the sides (at the piston pin openings) ("box" piston).
  • the piston carries one or more grooves for the piston rings, the top one being the compression rings and at least one bottom one serving as an oil scraper ring.
  • Most car pistons have two compression rings and one oil scraper ring.
  • So-called two-ring pistons with only one compression ring are also used for racing engines.
  • the piston skirts can also be provided with windows.
  • most two-stroke pistons have locking pins in the piston ring grooves to prevent twisting and binding of the piston ring gaps in the cylinder timing windows.
  • two-stroke engines with nose pistons which were supposed to improve gas exchange with cross scavenging.
  • reverse scavenging two-stroke engines have had a flat piston crown.
  • the knurling described above scrapes the resulting carbon and other combustion residues from the top land surfaces of the piston, so that when the piston moves downwards towards bottom dead center (BDC), this cannot damage the honing and wear is reduced.
  • BDC bottom dead center
  • This design height (throw height) is generally smaller for aluminum pistons than for steel pistons.
  • the higher elevation places special demands on the manufacturing process, since the materials used are rather unsuitable for the ejection.
  • safety distances must be observed, e.g. B. Knurling to the first piston ring.
  • the knurling is an integral ring element of a cylinder or cylinder liner, located at the level of the top dead center position of the corresponding piston on the inner wall of the cylinder or a cylinder liner faces the piston at TDC or its top land.
  • the clearance between the knurling and the top land surface is greatly reduced by oblique grooves that are angled to the cylinder axis or the axis of the cylinder liner and narrow the dead center position between the top land zone and the first piston ring.
  • the cylinder liner pushed by hand onto a vise and clamped, is given a clearance and an inner chamfer.
  • a knurled wheel specially ground
  • the embossing process creates the knurling on the head side, facing the inner wall and located in the area of the top dead center position of the corresponding piston crown piston. Then the smallest inner diameter is turned.
  • the release plays an important role in the manufacturing process. Stamping into the cylinder liner leads to material transport. If there is no clearance, the sealing surface of the cylinder or cylinder liner may become uneven.
  • the knurling is worked into the inner wall of the cylinder or the cylinder liner by machining or a printing or embossing process at the level of the top dead center position of the corresponding piston. According to the invention, it is provided for the sustainable and reliable degradation of the resulting oil carbon and other combustion residues.
  • the grooves of the knurling are raised and thus narrow the area and strip the carbon from the piston outer contour in the area between the piston crown and the first piston ring and counteract wear or the reduction of the honing. A deposit is only possible in a very thin, fine layer.
  • knurling by knurling - the knurling process described above - can be used for large-scale production.
  • the execution of the grooves of the knurling in the cylinder liner or the cylinder is angled arranged to the cylinder axis or axis of the cylinder liner.
  • the knurling of the cylinder liner or cylinder removes any carbon deposits and other conceivable residues from the top land of the piston.
  • the knurling of the cylinder liner or cylinder does not end with the first piston ring, but maintains a minimum safety distance to prevent damage to the piston ring.
  • the raised knurling of the cylinder liner or cylinder on the inside has a narrowing effect and reduces play in the top land area. This means that there is less space for oil carbon to form, since the inner diameter in the knurling area is smaller due to the raised grooves.
  • the piston 1 shows a section of an internal combustion engine with a cylinder liner 1, the embossed knurling 7 in the area of the dead center position of the corresponding piston 2 on the cylinder head side on its inner wall 6.
  • the piston 2 has piston rings 3, a piston crown 4 and the top land zone 5, which extends from the piston crown 4 extends to the first piston ring 3.
  • the constriction of the cylinder liner 1 in the area of the top dead center position of the corresponding piston begins with the knurling 7, as shown in detail in 2 you can see. Due to the raised knurling that the cylinder liner 1 has on its inner wall, the inner diameter in this area (OT) is smaller than in the rest of the cylinder or the cylinder liner 1.
  • the grooves 8 of the knurling 7 are arranged at an angle and have an angle to the axis of the cylinder or the cylinder liner 1.
  • the knurling 7 is an integral part of the cylinder or the cylinder liner 1 and can be machined from the preferred material of the cylinder or the cylinder liner 1 .
  • chipless knurling to attach the knurling 7 in the cylinder or in the cylinder liner.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP21000259.8A 2021-09-03 2021-09-14 Machine à combustion dotée d'un élément sur la paroi intérieure du cylindre permettant de racler la calamine Withdrawn EP4144979A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020005386.6A DE102020005386A1 (de) 2020-09-03 2020-09-03 Brennkraftmaschine mit einem Element an der Zylinderinnenwandung zum Abschaben von Ölkohle

Publications (1)

Publication Number Publication Date
EP4144979A1 true EP4144979A1 (fr) 2023-03-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21000259.8A Withdrawn EP4144979A1 (fr) 2021-09-03 2021-09-14 Machine à combustion dotée d'un élément sur la paroi intérieure du cylindre permettant de racler la calamine

Country Status (4)

Country Link
US (1) US20220065188A1 (fr)
EP (1) EP4144979A1 (fr)
CN (1) CN114135414A (fr)
DE (1) DE102020005386A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3543668A1 (de) 1985-12-11 1987-06-19 Man Nutzfahrzeuge Gmbh Zylinderlaufbuchse fuer hubkolben-verbrennungsmotoren
DE8705785U1 (de) * 1987-04-21 1988-08-18 Stork-Werkspoor Diesel B.V., Amsterdam Kolben-Verbrennungsmotor
DE10321034B3 (de) 2003-05-10 2005-01-13 Daimlerchrysler Ag Hubkolbenbrennkraftmaschine
US20090095248A1 (en) * 2007-10-10 2009-04-16 Yogesh Kumar Power assembly for internal combustion engine with in-cylinder deposit scraper
CN203702353U (zh) * 2014-02-21 2014-07-09 福建龙生机械有限公司 高强度合成铸铁缸套
DE102011012507B4 (de) 2011-02-25 2014-11-27 Ks Kolbenschmidt Gmbh Funktionsoptimierte Gestaltung eines Ringelements für Zylinder einer Brennkraftmaschine
CN106438083A (zh) * 2016-12-08 2017-02-22 广西玉柴机器股份有限公司 柴油机的气缸套
CN207583501U (zh) * 2017-08-18 2018-07-06 中国第一汽车股份有限公司 一种具有刮除积碳功能的气缸套

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3543668A1 (de) 1985-12-11 1987-06-19 Man Nutzfahrzeuge Gmbh Zylinderlaufbuchse fuer hubkolben-verbrennungsmotoren
DE8705785U1 (de) * 1987-04-21 1988-08-18 Stork-Werkspoor Diesel B.V., Amsterdam Kolben-Verbrennungsmotor
DE10321034B3 (de) 2003-05-10 2005-01-13 Daimlerchrysler Ag Hubkolbenbrennkraftmaschine
US20090095248A1 (en) * 2007-10-10 2009-04-16 Yogesh Kumar Power assembly for internal combustion engine with in-cylinder deposit scraper
DE102011012507B4 (de) 2011-02-25 2014-11-27 Ks Kolbenschmidt Gmbh Funktionsoptimierte Gestaltung eines Ringelements für Zylinder einer Brennkraftmaschine
CN203702353U (zh) * 2014-02-21 2014-07-09 福建龙生机械有限公司 高强度合成铸铁缸套
CN106438083A (zh) * 2016-12-08 2017-02-22 广西玉柴机器股份有限公司 柴油机的气缸套
CN207583501U (zh) * 2017-08-18 2018-07-06 中国第一汽车股份有限公司 一种具有刮除积碳功能的气缸套

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Publication number Publication date
DE102020005386A1 (de) 2022-03-03
US20220065188A1 (en) 2022-03-03
CN114135414A (zh) 2022-03-04

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