• 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:
    The invention relates to an internal combustion engine having a piston (8) reciprocating in a cylinder (2) and having a piston head (11) and at least one piston ring (9), together with a cylinder head (13) and a bushing (1 ) a combustion chamber (15) is limited, wherein in the bushing (1) to the combustion chamber (15) turned a stripping element (4) is arranged. Object of the present invention is to provide an internal combustion engine in which the heat losses are reduced from the combustion chamber. According to the invention this is achieved in that the stripping element (4) has at least one means for thermal insulation.
    公开号:AT519790A1
    申请号:T50305/2017
    申请日:2017-04-13
    公开日:2018-10-15
    发明作者:Dipl Ing Glensvig Michael；Dipl Ing Dreisbach Rolf；Rene Kögl Ing
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    The invention relates to an internal combustion engine with a reciprocating in a cylinder piston, which defines a combustion chamber with a piston head and at least one piston ring, together with a cylinder head and a liner, wherein in the bushing facing the combustion chamber, a stripping element is arranged.
    Scraper elements serve to clean the piston on its cylinder jacket surface up to the piston rings of oil and soot particles.
    Stripping element are known for example from US 2009/0241770 A1. In this case, the scraper element is arranged in the bushing, that an inner diameter of the scraper element is less than the diameter of the bushing. The scraper fulfills its tasks only by its geometric shape. Due to the direct contact of the scraper element to the liner and the high thermal conductivity of the material used in general, there is a heat loss from the combustion chamber via the scraper elements.
    The object of the present invention is to avoid these disadvantages and to provide an internal combustion engine which reduces the heat losses from the combustion chamber.
    This is inventively achieved in that the stripping element has at least one means for thermal insulation. This creates the advantage that the heat loss from the combustion chamber can be reduced. Furthermore, the thermal load on the liner is reduced. Thermal stresses are minimized by the concentration of temperature differences on the wiper element which is small compared to the liner.
    The same advantage arises when the means for thermal insulation has a thermally insulating layer to the combustion chamber.
    In order to determine the position of the scraper element in a simple manner, it is advantageous if the scraper rests against a bushing shoulder and thus against
    Scraper element is axially fixed by a fixing ring in the bushing.
    In order to prevent relative movement between the stripping element and the bushing, it is advantageous if the stripping element is firmly connected to the bushing.
    In order to achieve a good cleaning of the fire bar, it is favorable if the
    Stripping element to the bushing has a paragraph, the ratio of a
    Heel height to a bore diameter of the cylinder between a
    One-thousandth and one hundredth, the heel height in the radial direction of the bushing to an inner diameter of the stripping element extends.
    From the point of view of environmental protection, it is advantageous if the means for thermal
    Insulation has a catalytic coating to reduce emissions.
    In order to make the wiper element insensitive to soot particles and to prevent wear, it is favorable if the thermal insulation means has a hardness of Brinell greater than 80 HBW.
    A geometrically favorable shape results when the stripping a radial
    Extension which, to a bore diameter of the cylinder a
    Ratio is between two ten-thousandths and two hundredths.
    Good thermal insulation is obtained when the thermal insulation means has a thermal conductivity which is less than 50 W / mK, preferably less than 25 W / mK, and more preferably less than 5 W / mK.
    In order to achieve a higher efficiency, it is favorable if a top land, which between piston crown and a first piston ring designates a cylindrical outer surface of the piston, has a height which is between 15 and 50 percent and preferably between 25 and 50 percent of a bore diameter of the
    Cylinder amounts. In general, a ratio between 15 and 20% is common for diesel engines. In gasoline engines, the ratio is a little smaller.
    In order to further reduce the heat losses from the combustion chamber, it is favorable if the piston head has a thermal insulation layer toward the combustion chamber or if gas exchange valves have a thermal insulation layer toward the combustion chamber.
    The means for thermal insulation can be realized in a particularly simple manner if the stripping element has a gap relative to the bushing, and if preferably an additional cavity is provided between stripping element and bushing.
    The invention will be explained in more detail with reference to the non-limiting figures. Show it:
    1 shows a bushing and a stripping element of an internal combustion engine according to the invention in a first embodiment;
    FIG. 2 shows the stripping element in the first embodiment; FIG.
    3 shows the stripping element in a second embodiment;
    4 shows a bushing and a stripping element of an internal combustion engine according to the invention in a second embodiment;
    5 shows the installation situation of the stripping element in the second embodiment;
    Fig. 6 is a diagram of the internal combustion engine according to the invention;
    7 shows a stripping element of an internal combustion engine according to the invention in a third embodiment; and
    8 shows a stripping element of an internal combustion engine according to the invention in a fourth embodiment.
    In Fig. 1, a bushing 1 of a cylinder 2 of an internal combustion engine is shown. In this case, a stripping element 4 is arranged in an upper region 3 of the bushing 1. In the first embodiment, the stripping element 4 is applied directly to the bushing 1. In this case, the stripping element 4 is a thin layer 5 of thermally insulating material. This layer is about 0.5 mm thick in one embodiment with a bore diameter D of 180 mm. A thermal conductivity λ of this material is between 1 and 8 W / mK. A hardness according to Brinell is greater than 80 HBW (applied force is given in kilopond) to avoid damage by soot particles. Although soot particles generally have quite different hardnesses, a majority of the particles have a hardness that is within the range of the hardness of aluminum (about 80 HBW). The tensile strength of the material is greater than 200 N / mm2. Through this layer on the liner 1, the heat loss is reduced and taken over the stripping.
    FIGS. 3 to 4 show a second embodiment of the internal combustion engine, wherein the bushing 1 has a bushing shoulder 6 in an upper region 3. At this bushing shoulder 6, the stripping element 4 is applied and the stripping element 4 in turn forms the bushing 1 a paragraph 7. The paragraph 7 has a heel height A in the radial direction. The heel height A extends from the bushing 1 to an inner diameter B of the stripping element 4. The heel height A is for example for an internal combustion engine with a cylinder diameter of 180 mm about 0.5 mm.
    In this second embodiment, the stripping element 4 is designed as a means for thermal insulation. The stripping element 4 is made of a thermally insulating material. In the exemplary embodiment, the stripping element 4 has a radial extent C of approximately 3 mm for a bore diameter D of 180 mm.
    The stripping element 4 is made of thermally insulating material. In order to hold the stripping element 4 in its position, a fixing ring 18 is arranged in the bushing 1. The thermal conductivity λ is between 20 and 30 W / mK, the hardness H is greater than 80 HBW and the thermal expansion coefficient is less than 1 x 105 1 / K. The radial extent C of the stripping element 4 is about 3 mm in size.
    The stripping element 4 has a lower in this embodiment
    Expansion coefficient on, as the liner. In this case, a gap also exists during operation of the internal combustion engine. Therefore, the scraper must be fixed to the fixing ring 18.
    In Fig. 5 the installation situation of the stripping element 4 is shown in detail. In this case, a piston 8 is arranged with piston rings 9 in the bushing 1. The stripping element 4 is arranged in the upper region 3 such that in a top dead center of the piston 8, the stripping element 4 comes in the vicinity of the first piston ring 9 and at the same time frees a collected on a top land 10 of the piston 8 oil and soot. In the direction of the upper region 3 of the bushing 1, the piston 8 has a piston head 11 with a piston recess 12.
    In Fig. 6 coated areas of the internal combustion engine are shown. In this case, an upper boundary of the cylinder 2 is shown schematically, a part of a
    Cylinder head 13 which has a thermal insulation layer 14 in the region of the cylinder 2.
    A combustion chamber 15 is formed by the piston crown 11, liner 1, piston rings 9,
    Stripping element 4 and cylinder head 13 limited. To the combustion chamber 15, the
    Piston bottom 11, or the piston recess 12 and gas exchange valves on a thermal insulating layer 14. As a result, a heat loss from the combustion chamber 15 is reduced.
    The stripping element 4 does not move like the piston rings 9 and ensures in the
    Movement of the piston 8 in its top dead center for the cleaning of the
    Flank 10. Furthermore, the stripping 4 surface for coking and the piston rings 9 remain largely spared.
    A heel height A of about 0.5 mm is already sufficient to take over the tasks for cleaning the top land 10.
    In Fig. 7, a third embodiment is shown. In this case, between the scraper element 4 and bushing 1, an additional recess in the stripping element 4 forms a cavity 17. Through this cavity 17, an insulating effect is achieved. In this embodiment, the stripping element 4 is made of a material with a similar one
    Expansion coefficient, as the liner 1 made. The hardness H corresponds to the hardness of the liner 1, as well as the thermal conductivity λ. The
    Stripping element 4 has a slightly larger diameter before installation than the
    Bushing 1 and is cooled for installation (press fit). During the
    Operation, with temperature fluctuations of stripping element 4 and bushing 1, the stripping element 4 remains firmly in the bushing. 1
    In a fourth embodiment shown in FIG. 8, the stripping element 4 has a thermal insulating layer 5. Except for the thermal insulating layer 5, the stripping element 4 consists of generally conventional material. The thermally insulating layer 5 has a layer thickness F between 50 to 100 μιη and a thermal conductivity λ of 0.1 to 1 W / mK. The hardness H is more than 80 HBW and the tensile strength is greater than 200 N / mm2.
    The thermal insulating layer 5 and the thermal insulating layer 14, in a particular embodiment, each have catalytic components for reducing emissions and thus form a catalytic coating of the thermal insulation agent.
    The land 10 comprises a height h in the axial direction of the cylinder 2 which is between 25 and 50% of the bore diameter D. Examples of possible materials for the stripping element or the thermal insulating layer and the thermally insulating layer are aluminum alloys, SiRPA (Silica Reinforced Porous Anodizing Aluminum), aluminum oxide, mixed oxide ceramics (ZTA), partially stabilized zirconium oxides (ZrO 2), titanium oxide (TiO 2), aluminum titanate (ATi ) and other materials.
    权利要求:
    Claims (14)
    [1]
    P A T E N T A N S P R E C H E
    1. Internal combustion engine with a in a cylinder (2) reciprocating piston (8) having a piston head (11) and at least one piston ring (9), together with a cylinder head (13) and a bushing (1) a Combustion chamber (15) limited, wherein in the bushing (1) to the combustion chamber (15) turned a stripping element (4) is arranged, characterized in that the stripping element (4) has at least one means for thermal insulation.
    [2]
    2. Internal combustion engine according to claim 1, characterized in that the means for insulating a thermally insulating layer (5) to the combustion chamber (15).
    [3]
    3. Internal combustion engine according to any one of claims 1 or 2, characterized in that the stripping element (4) rests against a bushing shoulder (6) and thus axially against displacement from the cylinder head (13) away.
    [4]
    4. Internal combustion engine according to one of claims 1 to 3, characterized in that the stripping element (4) by a fixing ring (18) in the bushing (1) is axially fixed.
    [5]
    5. Internal combustion engine according to one of claims 1 to 4, characterized in that the stripping element (4) with the bushing (1) is firmly connected.
    [6]
    6. Internal combustion engine according to one of claims 1 to 5, characterized in that the stripping element (4) to the bushing (1) has a shoulder (7), wherein the ratio of a heel height (A) to a bore diameter (D) of the cylinder (2 ) is between one-thousandth and one hundredth, wherein the heel height (A) in the radial direction of the bushing (1) to an inner diameter (B) of the stripping element (4) extends.
    [7]
    7. Internal combustion engine according to any one of claims 1 to 6, characterized in that the means for thermal insulation comprises a catalytic coating for reducing emissions.
    [8]
    8. Internal combustion engine according to one of claims 1 to 7, characterized in that the means for thermal insulation has a hardness (H) according to Brinell, which is greater than 80 HBW.
    [9]
    9. Internal combustion engine according to one of claims 1 to 8, characterized in that the stripping element (4) has a radial extent (C) having a bore diameter (D) of the cylinder (2) has a ratio between two ten thousandths and two Hundredths lies.
    [10]
    10. Internal combustion engine according to one of claims 1 to 9, characterized in that the means for thermal insulation has a thermal conductivity (λ) which is less than 50 W / mK, preferably less than 25 W / mK and more preferably less than 5 W / mK is.
    [11]
    11. Internal combustion engine according to one of claims 1 to 10, characterized in that a firing bar (10) which between the piston head (11) and a first piston ring (9) denotes a cylindrical lateral surface of the piston (8), a height (h) which is between 15 and 50 percent and preferably between 25 and 50 percent of a bore diameter (D) of the cylinder (2).
    [12]
    12. Internal combustion engine according to one of claims 1 to 11, characterized in that the piston head (11) to the combustion chamber (14) towards a thermal insulation layer (14).
    [13]
    13. Internal combustion engine according to one of claims 1 to 12, characterized in that the gas exchange valves to the combustion chamber (15) towards a thermal insulation layer (14).
    [14]
    14. Internal combustion engine according to one of claims 1 to 13, characterized in that the stripping element (4) has a gap to the bushing (1), and that preferably an additional cavity (17) between the stripping element (4) and bushing (1) is.
    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    AT519790B1|2019-01-15|
    DE102018205673A1|2018-10-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2752633A1|1977-11-25|1979-05-31|Kloeckner Humboldt Deutz Ag|CYLINDER FOR A RECEPTACLE COMBUSTION MACHINE|
    DE3038235A1|1980-10-10|1982-05-06|Mahle Gmbh, 7000 Stuttgart|Cylinder insert for IC engine - has ribbed outer face to give freedom of movement to improve anti-coking action|
    DE8914785U1|1989-12-16|1990-02-08|Man B & W Diesel Ag, 8900 Augsburg, De|
    EP1061294A2|1999-06-04|2000-12-20|Wärtsilä NSD OY AB|Advanced antipolishing ring arrangement|
    EP1965068A1|2007-02-17|2008-09-03|DEUTZ Power Systems GmbH|Air gap insulation on a cylinder socket|
    DE102007063566A1|2007-12-27|2009-07-09|Pechwitz, Wilfried, Dipl.-Ing. |Internal combustion engine i.e. rotary piston engine, has isolating elements and engine components such as piston, of combustion chamber structure made of metallic and/or high resistant alloy such as heat resistant steel and titanium|
    US20090241770A1|2008-03-26|2009-10-01|Neil Blythe|Power assembly for internal combustion engine with welded-in piston scraper|
    WO2015134162A1|2014-03-03|2015-09-11|Cummins, Inc.|Carbon scraper|
    WO2016054173A1|2014-10-03|2016-04-07|Caterpillar Inc.|Cylinder liner assembly having air gap insulation|
    IT201800020110A1|2018-12-18|2020-06-18|Fpt Motorenforschung Ag|DIESEL INTERNAL COMBUSTION ENGINE|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50305/2017A|AT519790B1|2017-04-13|2017-04-13|Internal combustion engine|ATA50305/2017A| AT519790B1|2017-04-13|2017-04-13|Internal combustion engine|
    DE102018205673.0A| DE102018205673A1|2017-04-13|2018-04-13|Internal combustion engine|
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