• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Piston (1) for an internal combustion engine having a piston crown (2) and a circumferentially arranged crown edge (3), wherein at or near the periphery of the crown edge (3), a thermal barrier coating (4) is applied.
    公开号:AT517589A4
    申请号:T429/2015
    申请日:2015-07-03
    公开日:2017-03-15
    发明作者:Stephen Dimascio Paul；Gaca Magdalena；Zajac Piotr；Niedziela Sebastian；Pearson Luke
    申请人:Ge Jenbacher Gmbh & Co Og；
    IPC主号:
    专利说明:

    The invention relates to a piston for an internal combustion engine with the features of the preamble of claim 1, and an internal combustion engine.
    From the operation of pistons, it is known that carbon deposits on a piston crown or piston crown can impair the function of the piston and degrade the efficiency and emissions of the relevant internal combustion engine. From US 2008/0167403 A1 is known as a measure against the build-up of carbon deposits, to apply a non-stick layer on a piston or a piston ring of an internal combustion engine. It is known from US 2013/0025561 A1 to provide the well of a well piston with a thermal barrier coating (TBC) in order to increase the resistance of the piston to thermo-mechanical fatigue.
    The object of the invention is to reduce carbon deposits.
    This problem is solved by a piston having the features of claim 1.
    By applying a thermal barrier coating at or near the periphery of the crown rim, the temperatures in the region of the uppermost land land and the first (uppermost) annular groove are reduced, thereby significantly reducing the formation of carbon deposits and reducing stresses in the area of the uppermost piston ring. It is preferably provided that the cover layer is arranged on the adhesion promoter layer and the adhesion promoter layer is arranged on the crown edge. It has proven to be particularly advantageous to build the thermal barrier coating in two layers. The bonding agent layer is preferably matched in terms of their thermal expansion coefficient between the substrate, so the piston, and the cover layer, so as to keep thermal stresses as low as possible.
    It is preferably provided that the thermal barrier coating extends on the piston crown from or near the crown edge in the direction of a center of the piston crown. The heat-insulating layer thus preferably forms a circumferential ring on the piston crown, which extends in the direction of the center of the piston.
    It is preferably provided that the heat-insulating layer extends on the piston crown from or near the crown edge in the direction of a radial position spaced from the center of the piston crown, preferably to a radial position of approximately 80% of the distance between the crown edge and the center of the piston crown from the middle of the piston crown. In other words, the heat-insulating layer preferably covers a seam of the piston crown with a width of about 20% based on the radial dimension of the thermal barrier coating in the direction of the center of the piston crown.
    It can be provided that the thermal barrier coating has a decreasing thickness in the direction of the center of the piston crown. Due to this gradual course of the thermal barrier coating, a particularly favorable adhesion to the substrate is given and thermal stresses are reduced.
    It can be provided that a land area or a piston skirt of the piston is free from the thermal barrier coating. It is usually provided that a plurality of grooves is arranged in a land area of the piston near the piston crown.
    It is preferably provided that the cover layer of the thermal barrier coating consists of a ceramic, preferably of yttrium-stabilized zirconium oxide, and preferably has a dense-vertically-cracked structure. In experiments of the applicant, yttrium-stabilized zirconia (yttria stabilized zirconia (YSZ)), which is preferably applied via plasma spray, has been found to be particularly favorable as a thermal barrier coating. Preferably, the thermal barrier coating comprises a so-called DVC (Dense Vertically Cracked) structure. Thermal barrier coatings with DVC structure are superior to conventional layered structures in terms of thermal cycling.
    It can be provided that the adhesive layer of the thermal barrier coating consists of a metal alloy.
    Protection is also desired for an internal combustion engine, preferably a stationary internal combustion engine.
    Advantages of the invention are in particular: - Improved durability, robustness and reliability of the internal combustion engine, - Reduced fuel consumption, - Reduced oil consumption, - Increased oil and oil filter life, - Increased life of the top piston ring, - Reduced probability of unexpected cylinder exchange, - Expanded opportunities for emissions - and efficiency optimization.
    As also very advantageous, it has been found that, if necessary, can be dispensed with by the invention on the use of a scraper ring.
    The invention allows the use of narrower flames, which is advantageous in terms of hydrocarbon emissions.
    The temperatures below the piston crown are reduced, which increases the oil life.
    The invention differs quite fundamentally from known from the prior art measures against carbon deposits. Instead of reducing coking by anti-adhesion layers on the surface, the invention reduces the temperature in the region of the upper land and the upper annular groove and thus prevents the formation of carbon deposits at all.
    The invention is explained in more detail below by the figures. It shows:
    1 is a schematic representation of a piston at a glance,
    2 shows a thermal barrier coating in a first embodiment,
    3 shows a thermal barrier coating in a further exemplary embodiment,
    Fig. 4 is a thermal barrier coating in another embodiment.
    Figure 1 shows a schematic representation of a piston 1 in cross-section for orientation and naming of the components. The piston 1 has a piston crown 2 and a crown edge 3. At the crown edge 3 adjacent part of the lateral surface of the piston 1, the piston skirt 9, fire bridges 11 are formed. These are those areas between which the annular grooves 10 are located for receiving piston rings. A thermal barrier coating 4 extends from the outer circumference of the piston 1, ie from the crown edge 3 in the direction of the center 7 of the piston 1. The thermal barrier coating 4 has an adhesive layer 6 and a cover layer 5 in the exemplary embodiment shown. The thickness of the thermal barrier coating 4 is indicated by the reference numeral d. The thermal barrier coating 4 extends as a circumferential ring or hem on the piston crown 2 to an edge 8. Preferably, the thickness d of the thermal barrier coating 4 is reduced in a region of the edge 8, resulting in a favorable gradual transition to the uncoated region of the piston crown. 2 results. The radial distance r from the center 7 of the piston 1 is introduced to describe a radial extent of the thermal barrier coating 4.
    Figure 2 shows a piston 1 with a thermal barrier coating 4 in a first embodiment. In this case, the thermal barrier coating 4 is pulled to the crown edge 3, so that the edge of the crown edge 3 is formed by the thermal barrier coating 4. Visible is also the leakage of the layer 4 to the edge. 8
    FIG. 3 shows a piston 1 with a thermal barrier coating 4 in a further exemplary embodiment. In this case, the thermal barrier coating 4 is pulled over the crown edge 3 in the region of the uppermost land 11.
    In the embodiment shown in Figure 4, however, the thermal barrier coating 4 is not pulled to the crown edge 3, but runs immediately before this. The layer is therefore only close to the crown edge 3 zoom.
    List of reference numbers used: 1 piston 2 piston crown 3 crown edge 4 thermal barrier coating 5 topcoat 6 primer layer 7 center of the piston crown 8 central edge of the thermal barrier coating 9 piston skirt 10 ring groove 11 crown land area
    Innsbruck, July 1, 2015
    权利要求:
    Claims (10)
    [1]
    claims
    1. piston (1) for an internal combustion engine having a piston crown (2) and a circumferentially arranged crown edge (3), characterized in that at or near the periphery of the crown edge (3) has a thermal barrier coating (4) is applied.
    [2]
    2. Piston according to claim 1, wherein the thermal barrier coating (4) comprises a cover layer (5) and an adhesion promoter layer (6), wherein the cover layer (5) is arranged on the adhesion promoter layer (6) and the adhesion promoter layer (6) is arranged on the crown edge ,
    [3]
    3. Piston according to at least one of the preceding claims, wherein the thermal barrier coating (4) extends on the piston crown (2) from or near the crown edge (3) in the direction of a center (7) of the piston crown (2).
    [4]
    A piston according to claim 3, wherein the thermal barrier coating (4) extends on the piston crown (2) from or near the crown edge (3) in the direction of a radial position (r) spaced from the center (7) of the piston crown (2). preferably to a radial position (r) of about 80% of the distance between the crown edge (3) and the center (7) of the piston crown (2) measured from the center (7) of the piston crown (2).
    [5]
    5. Piston according to at least one of the preceding claims, wherein the thermal barrier coating (4) has a decreasing thickness (d) in the direction of the center (7) of the piston crown (2).
    [6]
    6. Piston according to at least one of the preceding claims, wherein a land portion (11) of the piston (1) is free from the thermal barrier coating (4).
    [7]
    7. Piston according to at least one of the preceding claims, wherein in a land portion (11) of the piston (1) near the piston crown (2) a plurality of grooves (10) are arranged.
    [8]
    8. Piston according to at least one of claims 2 to 7, wherein the cover layer (5) of the thermal barrier coating (4) consists of a ceramic, preferably of yttrium-stabilized zirconium oxide and preferably has a dense-vertically-cracked structure.
    [9]
    9. Piston according to at least one of claims 2 to 8, wherein the adhesive layer (6) of the thermal barrier coating (4) consists of a metal alloy.
    [10]
    10. internal combustion engine, preferably stationary internal combustion engine, with at least one piston (1) according to at least one of the preceding claims. Innsbruck, July 1, 2015
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    JP5117986B2|2008-10-08|2013-01-16|アート金属工業株式会社|Surface treatment method for piston skirt for internal combustion engine and piston for internal combustion engine|
    JP5248379B2|2009-03-17|2013-07-31|日立オートモティブシステムズ株式会社|Piston of internal combustion engine provided with multi-layer coating composition and surface treatment method of the piston|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA429/2015A|AT517589B1|2015-07-03|2015-07-03|Piston for an internal combustion engine|ATA429/2015A| AT517589B1|2015-07-03|2015-07-03|Piston for an internal combustion engine|
    PCT/AT2016/050239| WO2017004645A1|2015-07-03|2016-06-30|Piston for an internal combustion engine|
    US15/738,642| US10634090B2|2015-07-03|2016-06-30|Piston for an internal combustion engine|
    EP16740950.7A| EP3317508A1|2015-07-03|2016-06-30|Piston for an internal combustion engine|
    CA2990953A| CA2990953A1|2015-07-03|2016-06-30|Piston for an internal combustion engine|
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