• 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:
    A valve-piston system (20) of a cylinder of an internal combustion engine, with a piston (26) that is moveably guided up and down, with at least one inlet-side gas exchange valve (21) and at least one exhaust-side gas exchange valve (22), wherein the piston (26) on an end facing the gas exchange valves (21, 22) has a central piston trough (27) and lateral valve pockets (28) facing the gas exchange valves (21, 22), which merge into the central piston trough (27), and wherein the respective valve pocket (28) is formed disc section-like or funnel section-like in such a manner that a face (29) of the same facing the respective gas exchange valve (21, 22) is inclined relative to a perpendicular (30) to the axial direction of the piston (26) of a perpendicular (30) to the axial direction (25) of a valve body (24) of the respective gas exchange valve (21, 22).
    公开号:FI20185984A1
    申请号:FI20185984
    申请日:2018-11-22
    公开日:2019-05-31
    发明作者:Marcel Morgenstern
    申请人:Man Energy Solutions Se；
    IPC主号:
    专利说明:

    MAN Diesel & Turbo SE
    Valve-piston system of an internal combustion engine and internal combustion engine
    The invention relates to a valve-piston system of an internal combustion engine and to an internal combustion engine .
    20185984 prh 22 -11- 2018
    Typically, internal combustion engines typically have multiple cylinders. Each cylinder of an internal combustion engine has a piston which is moveably guided up and down in a cylinder liner of the respective cylinder. In addition to this, each cylinder of an internal combustion engine has at least one inlet-side gas exchange valve for at least charge air and at least one exhaust-side gas exchange valve for exhaust gas. In particular when the internal combustion engine is embodied as gas engine, it is not only charge air that is fed to the respective cylinder for combustion but also gaseous fuel in the form of a gas-air mixture. In particular when the internal combustion engine is embodied as diesel internal combustion engine, each cylinder has at least one injector, via which the fuel can be fed to the cylinder .
    From practice it is known that a piston of a cylinder of an internal combustion engine has a central piston trough on a face facing the gas exchange valves or on an end facing the gas exchange valves. It is known, furthermore, that on this end of the piston valve pockets valves are formed, wherein the piston during can be collision between exchange valves combustion engine
    Starting out from this, via and facing the gas such valve operation avoided.
    the exchange valve pockets a bodies of of the the gas internal the present invention is based on the object of creating a new type of valve-piston system of
    PB05839
    20185984 prh 22 -11- 2018 an internal combustion engine and an internal combustion engine with such a valve-piston system.
    This object is solved through a valve-piston system of an internal combustion engine according to Claim 1. According to the invention, the respective valve pocket is formed disc section-like or funnel section-like in such a manner that a face facing the respective gas exchange valve of the same is inclined relative to a perpendicular to the axial direction of the piston or a perpendicular to the axial direction of a valve body of the respective gas exchange valve. Because of the fact that with the valve-piston system according to the invention the valve pockets are formed disc section-like or funnel section-like, the formation of so-called hotspots in the transition region between the valve pockets and the piston trough is avoided. Furthermore, fewer swirls are created during the combustion so that the combustion of the fuel can take place altogether more effectively and accordingly with higher efficiency.
    Preferentially, the face of the respective valve pocket facing the respective gas exchange valve is inclined in the direction of the piston trough. This is particularly preferred for reducing or avoiding hotspots and for reducing swirls.
    According to a further development, a valve body of the respective gas exchange valve is formed cone section-like or truncated cone section-like in such a manner that a face facing the respective valve pocket of the same is inclined relative to the perpendicular to the axial direction of the valve body. Preferentially, the face of the respective valve body facing the respective valve pocket is inclined away from the piston trough. This is also preferred for avoiding hotspots and for reducing swirls. Furthermore, a safety distance between the valve bodies of the gas
    PB05839 exchange valves and the piston with minimal installation space is maintained.
    According to a further development of the invention, the face of the respective valve pocket facing the respective gas exchange valve is inclined with a first angle, wherein the face of the respective valve body facing the respective valve pocket is inclined with a second angle. Preferentially, the first angle and the second angle are equal in size, so that the inclined faces run parallel to one another. Alternatively, the second angle is larger than the first angle. This configuration of the invention is preferred for reducing or avoiding hotspots and for reducing swirls in the combustion chamber of the cylinder while maintaining a safety distance between the valve bodies of the gas exchange valves and the piston with minimal installation space.
    The internal combustion engine according to the invention is defined in Claim 10.
    Preferred further developments of the invention are obtained from the subclaims and the following description.
    Exemplary embodiments of the invention are explained in more detail by way of the drawing without being restricted to this. There it shows:
    20185984 prh 22 -11- 2018
    Fig. 1 a plan view of a cylinder of an internal combustion engine;
    Fig. 2 an extract of a valve-piston system of an internal combustion engine known from practice;
    Fig. 3 an extract of a valve-piston system of an internal combustion engine according to the invention.
    PB05839
    20185984 prh 22 -11- 2018
    The invention relates to a valve-piston system of an internal combustion engine and to an internal combustion engine .
    Fig. 1 shows a highly schematic plan view of a cylinder of an internal combustion engine. In the shown exemplary embodiment, the cylinder 10 of Fig. 1 has multiple inletside gas exchange valves 11 and multiple exhaust-side gas exchange valves 12. Accordingly, two inlet-side gas exchange valves 11 are shown in Fig. 1, via which at least charge air can be introduced into a combustion chamber of the cylinder 10. In Fig. 1, fuel is introduced into the combustion chamber of the respective cylinder via an injector 13, via which liquid fuel, such as for example diesel, heavy fuel oil or residual oil can be injected into the combustion chamber of the respective cylinder. Exhaust gas generated during the combustion of the fuel can be discharged from the combustion chamber via the exhaust-side gas exchange valves 12.
    It is pointed out here that the invention is not restricted to the use with internal combustion engines in which a liquid fuel such as diesel, heavy fuel oil or residual oil is combusted. On the contrary, the invention can also be employed with gas engines, in which a gaseous fuel is combusted, wherein with such gas engines a mixture of charge air and gaseous fuel is introduced into the combustion chamber of the cylinder via the inlet-side gas exchange valves 11. Furthermore, the invention can be utilised with dual-fuel engines.
    Fig. 2 shows a cross section by way of an extract through a cylinder 10 of an internal combustion engine, wherein the details shown in Fig. 2 correspond to the practice or the prior art. Accordingly of the shown gas exchange valve 11 or 12, Fig. 2 shows a valve body 14 which can be moved up
    PB05839 and down during the operation in the direction of its axial direction 15, in order to open or close the respective gas exchange valve 11 or 12. Furthermore, Fig. 2 shows a valve piston 16, which is moveably guided up and down in a liner of the cylinder which is not shown, namely in the direction of an axial direction of the piston 10, which typically extends parallel to the axial direction 15 of the valve body 14 of the respective gas exchange valve 11, 12.
    As is evidentfro:m Fig.2,itisalready knownfrompracticethatthepiston16onanend facing thegasexchangevalves11,12 hasacentralpiston trough 17. At
    this end of the piston 16, Fig. 2 shows, furthermore, a valve pocket 18, which faces the respective valve body 14 of the respective gas exchange valve 11 or 12, wherein via the respective valve pocket 18 during the operation a minimum distance between the piston 16 and the valve body 14 of the respective gas exchange valve 11, 12 is provided, in order to avoid during the operation a collision between the piston 16 of the respective cylinder and the respective valve body 14 of the respective gas exchange valve 11 or 12 of the respective cylinder 10.
    20185984 prh 22 -11- 2018
    Fig. 3 shows an extract of a valve-piston system 20 of a cylinder 23 of an internal combustion engine according to the invention, namely in the region of a valve body 24 of an inlet-side or exhaust-side gas exchange valve 21 or 22 and a piston 26. During the operation, the valve body 24 is moveable in the direction of its axial direction 25 in order to open or close the respective gas exchange valve 21 or 22. The piston 26 of the cylinder 23 is moveably guided up and down in the direction of its axial direction (not shown) in a liner of the cylinder 23 which is not shown, wherein the axial direction of the piston 26 typically extends parallel to the axial direction 25 of the respective valve body 24 of the respective gas exchange valve 21 or 22.
    PB05839
    20185984 prh 22 -11- 2018
    On an end facing the gas exchange valves 21, 22 the piston 26 has a piston trough 27, which is formed centrally on the end of the piston 26 facing the gas exchange valves 21, 22.
    At this end facing the gas exchange valves 21, 22, the piston 26 of the respective cylinder 23 furthermore comprises valve pockets 28, which interact with the gas exchange valves 21, 22. These valve pockets 28 merge into the central piston trough 27.
    In terms of the invention present here, the respective valve pocket 28 is formed disc section-like or funnel section-like, namely in such a manner that a face 29 facing the respective gas exchange valve 21, 22, namely the valve body 24 of the respective gas exchange valve 21, 22 of the respective valve pocket 28 is inclined relative to a perpendicular 30 to the axial direction of the piston 26 or to the axial direction 25 of the valve body 24 of the respective gas exchange valve 21, 22, namely in the direction of the piston trough 27 of the piston 26 with a first angle a.
    Through this configuration, the formation of so-called hotspots in particular in the region of the valve pockets 28, in particular in the region of a transition edge 31 between the respective valve pocket 28 and the piston trough 27 is avoided, while swirls, which negatively affect the combustion of the fuel in the combustion chamber of the cylinder 23 are additionally reduced. The valve pockets 28 harmonically merge into the piston trough 27.
    The valve body 28 is formed cone section-like or truncated cone-like on an end facing the piston 26 in such a manner that a face 32 facing the respective valve pocket 28 is inclined with a second angle β relative to a perpendicular 33 to the axial direction 25 of the respective valve body
    PB05839
    20185984 prh 22 -11- 2018
    24, namely in such a manner that the face 32 of the respective valve body 24 facing the respective valve pocket 28 is inclined away from the piston 26 or from the piston trough 27 or from the respective valve pocket 28.
    As explained, the face 29 of the respective valve pocket 28 facing the receptive gas exchange valve or the respective valve body 24 of the respective gas exchange valve 21, 22 is inclined with the first angle a, wherein the face 32 of the respective valve body 24 of the respective gas exchange valve 21, 22 facing the respective valve pocket 28 is inclined with the second angle β. Preferentially, the first angle a and the second angle β are identical in size so that the inclined faces 29, 32 extend parallel to one another .
    Alternatively it is also possible that the first angle a and the second angle β are different in size, so that the inclined faces 29, 32 do not then extend parallel to one another, in particular the first angle a in this case is smaller than the second angle β or the second angle β is larger than the first angle a, wherein virtual extensions of the inclined faces 29, 32 then intersect in the region of the piston 26, in particular in the region of the piston trough 27.
    The two angles α, β amount to a maximum of 45°, preferably to a maximum of 40°, particularly preferably to a maximum of 35°.
    With the invention, the formation of undesirable hotspots or regions with excessive temperatures, in particular in the transition region between the valve pockets 28 and the piston trough 27 can be avoided. Furthermore, swirls of a fuel to be combusted in the combustion chamber of the respective cylinder are reduced and the combustion can take place with greater efficiency because of this. A collision
    PB05839 between the valve bodies 24 of the gas exchange valves 21, 22 and the valve piston 26 is avoided.
    The invention can be employed both with diesel internal combustion engines and also with spark-ignition internal combustion engines namely with both two-stroke and also with four-stroke internal combustion engines. Here, both a liquid fuel such as for example diesel, heavy fuel oil or residual oil, or a gaseous fuel, such as for example natural gas can be combusted in the cylinders of the respective internal combustion engine.
    20185984 prh 22 -11- 2018
    PB05839
    List of reference numbers
    10Cylinder11Inlet-side gas exchange valve12Exhaust-side gas exchange valve13Inj ector14Valve body15Axial direction16Piston17Piston trough18Valve pocket20Valve-piston system21Inlet-side gas exchange valve22Exhaust-side gas exchange valve23Cylinder24Valve body25Axial direction26Piston27Piston trough28Valve pocket29Face30Perpendicular31Edge32Face33Perpendicular
    20185984 prh 22 -11- 2018
    权利要求:
    Claims (10)
    [1]
    The claims
    1. In an internal combustion engine cylinder valve-piston system (20) having a piston (26), which is guided up and down movable, at least one suction-side gas exchange valve (21) and at least one pako5 gas side of the gas exchange valve (22), the piston (26) at its end facing the gas exchange valves (21, 22), comprises a central piston recess (27) and lateral valve pockets (28) facing the gas exchange valves (21, 22), which engage with the central piston recess (27),
    10, characterized in that the respective valve pocket (28) is formed in the form of a disk part or a funnel part such that its surface (29) facing the respective gas exchange valve (21, 22) is inclined perpendicular to the axial direction of the piston (26). 30) or the corresponding gas exchange valve (21, 22) with respect to a perpendicular (30) towards the axial direction (25) of the valve body 15 (24).
    [2]
    Valve-piston system according to claim 1, characterized in that the surface (29) of the corresponding valve pocket (28) facing the respective gas exchange valve (21, 22) is inclined in the direction of the piston recess (27).
    [3]
    Valve piston system according to claim 1 or 2, characterized in that the valve body (24) of the corresponding gas exchange valve (21, 22) is formed in the form of a conical part or a frustoconical part in such a way that its corresponding valve pocket (28). ) is inclined with respect to a perpendicular (33) towards the axial direction (25) of the valve body (24).
    25
    [4]
    Valve-piston system according to claim 3, characterized in that the surface (32) of the corresponding valve body (24) facing the respective valve pocket (28) is inclined away from the piston recess (27).
    [5]
    Valve-piston system according to Claim 3 or 4, characterized in that a counter-valve facing the respective gas exchange valve (21, 21)
    The surface (29) of the 30-way valve pocket (28) is inclined at a first angle (a) and that the surface (32) of the corresponding valve body (24) facing the respective valve pocket (28) is inclined at a second angle (β).
    [6]
    Valve-piston system according to claim 5, characterized in that the first angle (a) and the second angle (β) are equal,
    35 so that the inclined surfaces (29, 32) extend parallel to each other.
    [7]
    Valve-piston system according to claim 5, characterized in that the first angle (a) and the second angle (β) are different, so that the inclined surfaces (29, 32) do not run parallel to each other.
    [8]
    The valve piston system of claim 7, wherein
    5 n e 11 u that the second angle (β) is larger than the first angle (a).
    [9]
    Valve-piston system according to claim 7, characterized in that the first angle (a) and the second angle (β) have a maximum dimension of 45 °.
    [10]
    An internal combustion engine having at least one cylinder, wherein the cylinder or each cylinder comprises a valve piston system according to any one of claims 1 to 9.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP2000320335A|1999-05-12|2000-11-21|Toyota Motor Corp|Cylinder injection-type internal combustion engine|
    JP4552895B2|2006-05-17|2010-09-29|トヨタ自動車株式会社|Internal combustion engine|
    FI124187B|2009-12-16|2014-04-30|Wärtsilä Finland Oy|Internal combustion piston arrangement|
    DE102012103212A1|2012-04-13|2013-10-17|Mwm Gmbh|Piston of an internal combustion engine|
    CN103835803B|2014-02-24|2016-02-24|大连理工大学|Diesel engine collision shunting combustion room|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017221527.5A|DE102017221527A1|2017-11-30|2017-11-30|Valve Piston System of an internal combustion engine and internal combustion engine|
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