• 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:
    In a piston (1) for combustion engines are included a piston crown (2), a piston skirt (3) and portions (4A, 4B; 13) for receiving a piston pin (5) by means of which the piston is pivotally supported on a connection rod, whereby a protection (7) covering a major portion of a bottom side of the piston crown is supported on the piston pin. The protection is fitted in sealing engagement with a first inner portion of the piston skirt, forming an uninterrupted gap in relation to a main portion of the piston crown and with at least a portion of the protection being provided at a distance inside a second outer portion of the piston skirt.
    公开号:SE1001176A1
    申请号:SE1001176
    申请日:2010-12-09
    公开日:2012-06-10
    发明作者:Peter Nyberg
    申请人:Peter Nyberg；
    IPC主号:
    专利说明:

    30 2 A more special object of the invention is to provide an improved piston for internal combustion engines, which is adapted for high operating temperatures.
    Another specific object of the invention is to provide a protection for a piston for internal combustion engines, which prevents coking at piston surfaces and oil ducts.
    These and other objects are achieved by the invention as defined in the appended claims.
    The invention generally relates to pistons for internal combustion engines, with a piston crown, a piston skirt and a portion for receiving a piston bolt which stores the piston in a connecting rod. In order to achieve optimum conditions at the underside of the piston and in particular at oil ducts for cooling piston rings, a basic idea for the invention is to use a protection supported on the piston bolt which covers a main part of the underside of the piston crown. The cover is in sealing engagement with an inner piston skirt portion, in the assembled state forms a gap against the piston crown and is at least partially arranged inside an outer piston skirt portion. This makes it possible to avoid problems with the burning of oil at the piston and the coking and clogging of oil channels.
    According to another aspect of the invention, there is provided an effective protection for a piston in an internal combustion engine. This protection consists of a hood with a dome-shaped bottom, a cylindrical side wall and a rim made in one piece with each other and having a bearing for a piston bolt, with the bearing portion integrated in the side wall and consisting of diametrically opposite openings in the side wall. Through such an embodiment, a very advantageous and effective coking protection for such a piston is achieved in a cost-effective manner.
    Further developments of the invention and embodiments thereof are set out in the subclaims.
    Other advantages of the invention will become apparent upon reading the following detailed description of embodiments of the invention.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention and further views and advantages thereof will be best understood by reference to the following description and the accompanying drawings, in which: Fig. 1 is an exploded view of an embodiment of a piston according to the invention; Fig. 2 is a longitudinal section through the piston according to the invention shown in Fig. 1 along a first plane A-A marked in Figs. 3; Fig. 3 is a plan view from below of the embodiment of the piston according to the invention shown in Fig. 1. Fig. 4 is a longitudinal section through the piston shown in Fig. 1 in a plane perpendicular to Fig. 2, also marked in Fig. 3. BB and with piston skirt and piston bolt removed; Fig. 5 is a perspective view of the cover arranged in the piston according to the invention; and Fig. 6 is a plan view from the side of the cover according to Fig. 5. DETAILED DESCRIPTION The principles of the invention will now be explained with reference to an exemplary embodiment of the invention, which is shown in the accompanying drawings. The embodiment of the invention shown in the drawings is an example of an application of the basic principles of the invention to a known type of piston for internal combustion engines. It should be emphasized, however, that the embodiment shown is for the sole purpose of illustrating a presently preferred embodiment of a piston according to the invention and is not intended to limit the invention to the details shown in the drawings. As mentioned above, the accompanying drawings show a type of two-part piston 1 in which the piston crown 2 and the piston skirt 3 consist of separate parts. The piston crown 2 and the piston skirt 3 both have repair portions 4A, 4B to be supported articulated on a piston bolt 5 schematically shown in the figures which in turn is articulated connected to a connecting rod 6 only indicated in Fig. 2. Such a piston is particularly suitable for use in engines with higher operating temperatures. This is partly due to the fact that it allows the use of various specifically adapted materials in the crown 2, which is exposed to the highest temperatures, and the skirt 3, which carries piston wings 9. In addition, a gap 17 sealed between the various parts by means of adhesive seals 15 contributes . The various materials can in one example consist of steel in the crown 2 and aluminum in the skirt 3. The sealed gap 17 10 15 20 25 30 4 in turn ensures that widening in the piston crown 2 exposed to the highest temperatures is not transferred to the piston skirt. 3. This is important so as not to overload the piston rings 9. By taking up temperature movements for the piston crown 2 in the gap 17, it is possible to prevent the piston rings 9, which abut sealingly against a cylinder wall (not shown) in the motor, from cutting against this cylinder wall.
    The piston skirt 3 has a general cylindrical shape formed with a first inner portion 3A and a second outer portion 3B arranged at a distance outside it, which are connected to each other in diarnetrally opposite connecting areas 3D, 3E (see Fig. 3). These connecting areas 3D, 3E can extend over a limited part of the circumference of the piston skirt 3 and over a limited part of the height of the piston skirt 3 or over its entire height. Through these connecting areas 3D, 3E, the bearing portion 4B of the piston bolt 5 extends, which is designed as diametrically opposite openings arranged through the connecting grooves 3D, 3E of the piston skirt 3.
    In other words, an annular recess 3C is formed between the first 3A and second 3B portions of the piston skirt 3, downwardly away from the piston crown 2, extending around the entire circumference of the piston skirt 3, except at the connecting areas 3D, 3E. The recess 3C communicates at its upper end with a number of separate oil channels 8 for supplying oil to at least one non-denominated oil lubricated oil ring among the piston rings 9.
    The piston crown 2 has a general disc shape with a preferably partially arched underside 2A and with holding portions 2B, 2C arranged diametrically opposite each other downwards from the disc shapes (see Figs. 1 and 4). In the holding portions 2B, 2C a bearing portion 4A is formed for the piston bolt 5, which here too is designed as diametrically opposite openings arranged therein.
    The piston 1 according to the invention is further provided with a cover 7 supported on the piston bolt 5 which covers at least a main part of the underside 2A of the piston crown 2. The purpose of the cover 7 is to protect the piston 1, and more specifically the underside 2A of the piston crown 2, from "coking", i.e. that oil burns there. Such coking can also lead to oil clogs being blocked so that oil does not reach places where it is to operate. In the worst case, such clogging can lead to an engine cutting. The cover 7 consists of a generally cup- or hat-shaped hood with an upper dome-shaped top portion 10 with a rounding which is suitably adapted to the curvature in the underside 2A of the piston crown 2. Furthermore, the cover 7 has a substantially cylindrical side wall 11 and an annular, downwardly open rim 12. All these parts of the cover 7 are suitably made in one piece with each other. The side wall 11 is provided with a bearing portion 13 for the piston bolt 5, which bearing portion is an integral part of the side wall 11 and also in this case is basically formed by diametrically opposite openings 13A, 13B in the side wall 11.
    The cover 7 consists of a material with limited thermal conductivity and may suitably be formed of a carrier composite which preferably contains carbon. Alternatively, the cover 7 can also be made in one piece of aluminum. Parts of the cover 7 are further adapted to the shape of the piston crown 2. Mounted on the piston bolt 5, it thus forms an at least substantially unbroken or continuous gap 16 towards at least a main part of the underside 2A of the piston crown 2, i.e. the hottest surface of the piston 1. Thus, heat transport between the material of the piston crown 2 and the cover 7 can be absent or at least greatly reduced. Although the gap 16 between the cover 7 and the piston crown 2 in the drawing figures is shown with a certain width, it should be obvious that this gap 16, depending on the application, can be made with primarily larger, but also smaller width than that shown. A wider gap can, for example, be used at very high operating temperatures, in order to effectively prevent heat transfer from piston crown 2 to protection 7. On the other hand, a narrower gap may come into question when limited space is available in the piston.
    With such a protection fitted, the operating temperature of the piston 1 can be raised, which results in improved combustion and lower fuel consumption. With the cover 7 in place, the oil in the engine does not have to cool the hottest part of the piston 1, ie. piston crown 2, in that the cover 7 covers this part. In this way, the engine oil can maintain its quality for a longer operating time.
    The cover 7 is mounted on the piston bolt 5 by means of the storage portion 13 which in mounted condition connects sealingly to the piston bolt 5 so that also this and its portions which are stored in the piston 1 itself are protected from the influence of hot oil. Parts of the cover 7 are also adapted to the shape of the piston skirt 3 so that in the assembled state it settles in sealing engagement with the first inner portion 3A of the piston skirt 3. The purpose of this is to seal with high precision against this inner portion 3A of the piston skirt 3 so that hot oil cannot enter the gap 16 between the cover 7 and the underside 2A of the piston crown 2. Furthermore, at least a part, preferably a main part, of the cover 7 is arranged at a suitable distance inside the second outer portion 3B of the piston skirt 3 in order in this way to help direct oil from the motor into the recess 3C and further to the oil channels 8 for lubrication. of the oil ring 9. 10 15 20 25 30 6 In the embodiment shown, the cover 7 specifically has a closed bottom part 10 facing the piston crown 2, which merges into a first end 11A of the generally cylindrical side wall 11, which at its second end 11B merges into the downwardly open rim 12 directed away from the underside 2A of the piston crown 2. In connection with the rim 12, the cover 7 has a substantially circular outer circumference 7C and in direct connection therewith an abutment surface 7D facing obliquely upwards towards the piston crown 2 intended for sealing abutment with high precision against a surface at a lower end edge of the first inner portion 3A of the piston skirt 3. In the area of the largest outer circumference 7C, the cover 7 has an outer diameter D2 which is clearly smaller than an inner diameter D1 of the second outer portion 3B of the piston skirt 3, whereby the said open oil connection to the recess 3C and the oil channels 8 is ensured.
    In alternative, but not specifically shown embodiments of the invention, variants or modifications of the various parts shown thereof can be used without departing from the scope of the invention. Above all, the invention is not limited to the schematic embodiment shown and described of a two-part piston. Although the invention today can be assumed to have its greatest area of use in engines which are intended to operate at higher operating temperatures and which are therefore made with a separate piston crown and piston skirt, the invention to its widest extent also includes variants and modifications of such a piston where its distinctive features provide the same basic functions and benefits as described above. Although the invention has been shown and described with particular reference to an application intended specifically for four-stroke engines for heavy vehicles, the invention should in no way be limited to just such applications. The basic principles of the invention can thus be applied to other types of engines and to other types of vehicles.
    The invention has been described in connection with an embodiment which is currently considered to be most practical and expedient, but it is to be understood that the invention is not limited to the embodiment shown and described. The invention shall thus cover various modifications and equivalent arrangements that fall within the scope and scope of protection of the appended claims.
    权利要求:
    Claims (10)
    [1]
    A piston (1) for an internal combustion engine, comprising a piston crown (2), a piston skirt (3) and portions (4A, 4B, 13) adapted to receive a piston bolt (5) by means of which the piston is intended to be rotatably supported on a connecting rod (6), characterized in that: a) a cover (7) is supported on the piston bolt which covers at least a main part of a underside (2A) of the piston crown; b) the cover is mounted in sealing engagement with a first inner portion (3A) of the piston skirt; c) the cover forms in the assembled state an at least substantially continuous gap (16) relative to at least a main part of the underside of the piston crown; and d) at least a part of the cover is arranged at a distance inside a second outer portion (3B) of the piston skirt.
    [2]
    Piston (1) according to Claim 1, characterized in that the cover (7) has a substantially circular outer circumference (7C) in direct connection with which an abutment surface (7D) facing upwards towards the piston crown (2) is arranged for sealing abutment against the piston skirt. (3) first inner portion (3A).
    [3]
    Piston (1) according to claim 2, characterized in that the cover (7) in the region of its circular largest outer circumference (7C) has an outer diameter (D2) which is clearly smaller than an inner diameter (D1) of the piston skirt (3). ) second outer portion (3B).
    [4]
    Piston (1) according to one or more of Claims 1 to 3, characterized in that an annular recess (downwards in the direction of the piston crown (2) is formed between the first (3A) first and 3 (3B) portion of the piston skirt (3B). 3C) which at its upper end communicates with oil channels (8) for supplying oil to at least one piston ring (9).
    [5]
    Piston (1) according to one or more of Claims 1 to 4, characterized in that the cover (7) has a bearing portion (13) for the piston bolt (5), which in the assembled state connects sealingly to the piston bolt, protecting parts thereof from impact. of hot oil.
    [6]
    Piston (1) according to one or more of Claims 1 to 5, characterized in that the cover (7) has a closed bottom part (10) facing the underside (2A) of the piston crown (2) which merges into a first end (11A) of a generally cylindrical side wall (11) which at its other end (11B) merges into an open rim (12) directed away from the piston crown.
    [7]
    Piston according to Claim 5 or 6, characterized in that the bearing portion (13) of the cover (7) for the piston bolt (5) is formed by openings (13A, 13B) in diametrically opposite portions of the side wall (11) and is an integral part. of this.
    [8]
    Piston (1) according to one or more of Claims 1 to 7, characterized in that the cover (7) consists of a material with a limited conduction capability.
    [9]
    Protection (7) for a piston (1) according to one or more of claims 1-8, characterized in that it consists of a generally cup-shaped hood with a dome-shaped top portion (10), a substantially cylindrical side wall (11) and an annular rim (12) made in one piece with each other and having a bearing portion (13) for a piston bolt (5), the bearing portion being integrated in the side wall and consisting of diametrically opposite openings (13A, 13B) in the side wall.
    [10]
    Protection (7) according to claim 9, characterized in that it is formed of a omp berry composite, preferably containing carbon fiber.
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    同族专利:
    公开号 | 公开日
    EP2649289A1|2013-10-16|
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    US20130284141A1|2013-10-31|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1905582A|1928-04-23|1933-04-25|Gazda Anton|Piston with cooling effect|
    FR746826A|1931-11-07|1933-06-07|Improvements to pistons and their manufacturing processes|
    US2104347A|1935-09-16|1938-01-04|Charles A Criqui|Piston|
    GB491843A|1937-02-06|1938-09-06|Arthur Villenuve Nicolle|Improvements in and relating to pistons|
    GB496317A|1937-10-05|1938-11-29|Arthur Villeneuve Nicolle|Improvements in and relating to pistons|
    GB802480A|1955-03-23|1958-10-08|Schmidt Gmbh Karl|Improvements in or relating to oil-cooled pistons for internal combustion engines|
    US3805677A|1972-03-01|1974-04-23|Trw Inc|Two-piece oil-cooled piston with thermal expansion control|
    DE3329787A1|1982-08-20|1984-02-23|AE PLC, Rugby, Warwickshire|PISTON AND METHOD FOR THEIR PRODUCTION|
    FR2540183B1|1983-01-27|1985-05-10|Bmb Ste Civile|
    CA2032794A1|1990-12-20|1992-06-21|Edgar L. Olsen|Internal combustion steam engine|
    JPH0693927A|1992-07-27|1994-04-05|Isuzu Motors Ltd|Piston of internal combustion engine|
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    US20040261752A1|2003-06-26|2004-12-30|Wolfgang Rein|Phosphatized and bushingless piston and connecting rod assembly having an internal gallery and profiled piston pin|
    CN2648090Y|2003-08-29|2004-10-13|林孟良|Piston and piston ring assembly|
    DE102004057284A1|2004-11-26|2006-06-14|Fev Motorentechnik Gmbh|Lightweight piston for thermally highly stressed pistons|
    US7654240B2|2006-08-18|2010-02-02|Caterpillar Inc.|Engine piston having an insulating air gap|
    US7383808B1|2007-07-03|2008-06-10|Federal-Mogul World Wide, Inc.|Articulated piston skirt|
    JP2010133365A|2008-12-05|2010-06-17|Isuzu Motors Ltd|Piston of internal combustion engine|SE536159C2|2011-11-11|2013-06-04|Peter Nyberg|Piston and crankcase assemblies|
    US9797337B2|2015-07-10|2017-10-24|Mahle International Gmbh|Oil-cooled piston for an internal combustion engine|
    DE102015218430A1|2015-09-25|2017-03-30|Mahle International Gmbh|Piston for an internal combustion engine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1001176A|SE535330C2|2010-12-09|2010-12-09|Högtemperaturkolv|SE1001176A| SE535330C2|2010-12-09|2010-12-09|Högtemperaturkolv|
    US13/992,721| US8978612B2|2010-12-09|2011-11-10|High temperature piston|
    EP11847127.5A| EP2649289A4|2010-12-09|2011-11-10|High temperature piston|
    JP2013543127A| JP2014500436A|2010-12-09|2011-11-10|High temperature piston|
    BR112013014218-9A| BR112013014218B1|2010-12-09|2011-11-10|high temperature piston|
    CN201180059105.9A| CN103403331B|2010-12-09|2011-11-10|High temperature piston|
    PCT/SE2011/051350| WO2012078093A1|2010-12-09|2011-11-10|High temperature piston|
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