• 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 a combustion chamber (1) for an internal combustion engine with a roof-shaped combustion chamber ceiling (2) formed by a cylinder head (3) and a combustion chamber floor (4) formed by a piston (6), with a substantially central combustion chamber ceiling (2). arranged ignition source (9) and in the combustion chamber ceiling (2) - preferably laterally arranged injection device (13), wherein the combustion chamber bottom (4) partially by a in the piston (6) arranged piston recess (11) is formed. In order to enable optimal flame propagation and maintenance of the charge movement in the combustion chamber (1), it is provided that the distance (a) between the combustion chamber ceiling (2) and the combustion chamber floor (4) - starting from a maximum distance (amax) in the region of the ignition source ( 9) - in at least the piston pin direction and / or 90 ° to the piston pin direction, preferably in each radial direction zur Kolbenrand (12) towards continuously decreases, preferably the distance (a) in the direction 90 ° to an imaginary central reference surface between the combustion chamber ceiling (2) and Piston (6) is measured.
    公开号:AT514021A1
    申请号:T50173/2013
    申请日:2013-03-13
    公开日:2014-09-15
    发明作者:Paul Dr Kapus；Kurt Ing Prevedel
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    1 56561
    The invention relates to a combustion chamber for an internal combustion engine having a roof-shaped combustion chamber ceiling formed by a cylinder head and a combustion chamber floor formed by a piston, with an ignition source arranged at least approximately centrally in the combustion chamber ceiling and an injection device arranged in the combustion chamber ceiling, preferably lateral injection means, the combustion chamber floor partially is formed by a piston recess arranged in the piston.
    EP 1 362 969 B1 discloses a piston for a direct-injection spark-ignited internal combustion engine with a cylinder head with an ignition device arranged centrally in the cylinder and a side-facing injector for direct fuel injection, the piston having a central piston recess and the piston chamber side recesses for clearance of intake valves and exhaust valves. The piston recess has a substantially teardrop-shaped plan view, wherein the side surfaces of the piston recess are modeled essentially on an injection jet emanating from the injection region.
    Also from DE 20 2011 106 803 Al a combustion bowl for a piston with a substantially teardrop-shaped outline is known.
    The piston recess of these known pistons depend on the conditions of the injection jet, but not on the conditions of the flame propagation and the charge movement in the combustion chamber.
    DE 10 2011 077 342 A1 describes a combustion system with a piston having a spherical dome with a spherical concave depression defined in the dome, the depression being located on one side of the piston near the inlet valves. This embodiment is not based on the needs of flame propagation. Rather, the high piston build-up impedes flame propagation.
    The object of the present invention is to develop a combustion chamber which meets the requirements for optimum tumble motion and optimum flame propagation. Furthermore, injection jets are to be kept within the piston recesses during fuel injection. 2/16 2
    According to the invention this is achieved in that the distance between the combustion chamber ceiling and the combustion chamber bottom - starting from a maximum distance in the ignition source - in at least the piston pin direction and / or 90 ° to the piston pin direction, preferably decreases continuously in each radial direction to the piston edge, wherein Preferably, the distance (a) is measured in the direction 90 ° to an imaginary central reference surface between the combustion chamber ceiling and piston.
    The trough shape should generally be chosen so that, together with the combustion chamber roof, a harmonious cross-sectional profile results from the ignition source to the edge of the combustion chamber (continuously decreasing cross section).
    The minimum distance in the area of the piston edge should be at least 3mm.
    An optimal flame propagation succeeds when the combustion chamber floor is designed in the region of the ignition source so that an inscribed fictitious ball can be arranged at the top dead center of the piston whose diameter corresponds to the maximum distance between the combustion chamber ceiling and the combustion chamber floor. Preferably, it is provided that the ratio of the maximum distance between the combustion chamber ceiling and the combustion chamber floor to the cylinder radius is about 0.3 to 0.55, preferably 0.35 to 0.5 mm. The fictitious ball, which finds place in the upper dead center of the piston in the residual combustion chamber below the ignition source, should be as large as possible.
    In order not to destroy the tumble early during the compression, it is advantageous if the combustion chamber floor in a subsequent to the rear wall outside the piston bowl area is formed sloping towards the piston recess, preferably a tangent of the sloping region with a normal plane to the cylinder axis Angle between 5 ° and 15 °. It is preferably provided that an angle subtended by a tangent of one of the injection devices facing the rear wall of the piston recess and the cylinder axis is between 0 ° and 30 °, preferably 5 ° and 30 °. Furthermore, it is advantageous if at least one tangent on a side wall of the Kolberimulde, which adjoins the rear wall laterally, with a Normalale the cylinder axis at an angle of> 30 °, preferably> 45 °. This ensures that injection jets that hit the piston recess 3/16 3 are reflected so that they do not hit the cylinder wall. This avoids oil thinning.
    The combustion chamber floor should be completely free of undercuts or steps.
    In order to realize the required compression ratio, to represent the desired piston recess shape and still allow valve pockets for the clearance of the intake or exhaust valves, it is advantageous if the combustion chamber floor in the region of the inlet valves and / or exhaust valves, valve pockets, preferably between at least one valve pocket and a side wall of the piston recess a chamfer is formed. This ensures that all beams are kept in the piston recess in a crank angle range of about 50 ° before top dead center, since all points of impingement of the rays are in the piston recess.
    In order to enable a simple production of the piston, it is advantageous if the piston recess bottom is flat in a central, substantially circular region of at least 10 mm in diameter. The piston bowl bottom is thus shaped so that a riser can be accommodated. The piston recess is formed away from the inlet and extending toward the piston bowl bottom, so that there is preferably no step in the intersection with the Steigerbearbeitung.
    In order to minimize stresses above the piston pin, radii of the piston recess are dimensioned as large as possible. For the Tumbleführung it is advantageous if the side walls of the piston recess are designed in the widest possible range at an angle <30 ° with respect to a piston symmetry plane.
    The invention will be explained in more detail below with reference to FIGS.
    Show it:
    1 to 3 a combustion chamber according to the invention in a section along the line I-I in Fig. 4 or Fig. 5, 4/16 4th
    4 shows the combustion chamber in section along the line IV-IV in FIGS. 1 to 3 or 5, FIG.
    5 shows a piston of the combustion chamber according to the invention from FIGS. 1 to 4 in an oblique view,
    6 shows the detail VI of FIG. 5,
    7 shows the piston and the injection device in a further oblique view,
    Fig. 8 shows a piston in an embodiment variant according to the invention and
    9 shows this piston in a section along the line IX-IX in Fig. 8.
    Functionally identical parts are provided in the embodiment variants with the same reference numerals.
    The combustion chamber 1 is spanned by a substantially roof-shaped combustion chamber ceiling 2, which is formed by the cylinder head of an internal combustion engine, and the combustion chamber floor 4, which is formed by the piston 6 reciprocating in the cylinder 5. In the combustion chamber 1 open two intake valves and two exhaust valves, wherein - as shown in Figure 1 - the axes 7 of the exhaust valves to the axes 8 of the intake valves an angle α between 25 ° and 45 °, preferably between 30 ° and 35 °, span.
    Reference numeral 9 designates an ignition source which discharges approximately centrally into the combustion chamber 1 and which is arranged near the cylinder axis 10 in the combustion chamber ceiling 2. The combustion chamber floor 4 is partially formed by the trough bottom 11 a of a piston recess 11 formed in the piston 6. The piston surface is shaped such that at the top dead center of the piston 6, the distance a measured between the combustion chamber ceiling 2 and the combustion chamber floor 4 in the direction 90 ° to an imaginary central reference surface 22 of the cylinder axis 10 - starting from a maximum distance amax in the region of the ignition source 9 - decreases in at least the piston pin direction x and / or in a 90 ° to the piston pin direction (x) inclined normal direction y, the piston edge 12 out continuously up to a minimum distance amin. The combustion chamber floor 4 is formed completely without undercuts or steps. The minimum distance amin in the range of 5/16 5
    Piston edge 12 on the side facing away from the injector 13 side of the piston 6 is min. 3 mm. In the exemplary embodiment, the injection device 13 is arranged in a lateral region of the combustion chamber ceiling .2, as can be seen in FIG. 1 or FIG.
    In the region of the ignition source 9, the combustion chamber 1 has the largest residual volume. The combustion chamber ceiling 2 and the combustion chamber floor 4 are designed so that in the range of max. Distance amaxdem combustion chamber 1 a fictitious ball K can be arranged, whose diameter corresponds to the maximum distance amax between the combustion chamber ceiling 2 and the combustion chamber floor 4.
    The ratio of the maximum distance amax between the combustion chamber ceiling 2 and the combustion chamber floor 4 to the cylinder radius R is about 0.3 to 0.55, preferably between 0.35 and 0.5. The combustion bowl 11 has a rear wall 14 in an opposite region remote from the injection direction 13. A tangent tu on this rear wall 14 closes with the cylinder axis 10 an angle ß between 0 ° and 30 °, in particular between 5 ° and 30 °, as shown in Fig. 3. The rear wall 14 passes outside of the piston recess in a region 15 of the piston head 4, which is formed sloping in the direction of the combustion chamber trough 11 back. A tangent ti5 on this sloping region 15 of the combustion chamber floor 4 includes with a normal plane 16 on the cylinder axis 10 an angle γνοη about 5 ° to 15 °, as is apparent from Fig. 2.
    The combustion chamber floor 4 is formed symmetrically with respect to a plane of symmetry γ extending through the cylinder axis 10 onto the ignition source 9 and the injection device 13. The side walls 17 of the piston recess on both sides of the plane of symmetry ε are formed to the piston recess bottom 11a out.
    The tangential planes ti7auf the side walls 17 in the region of the trough edge 18 close to the normal plane 16 an angle δ> 30 °, preferably> 45 °, as can be seen from Fig. 4.
    As shown in FIG. 3, the rear wall 14 merges into the piston recess bottom 11a, wherein a radius of curvature vx between 5 to 12 mm is formed between rear wall 14 and piston recess bottom 11a. Between the rear wall 14 and the sloping portion 15, a radius of curvature r2 is between 1 to 1.5 mm formed. 6/16 6
    It can be seen from FIG. 5 that the combustion chamber bottom 4 has outlet valve pockets 19 in the region of the outlet valves and inlet valve pockets 20 in the region of the inlet valves. In the transition between the inlet valve pockets 20 and the side walls 17 of the piston recess 11, chamfering bevels 21 are provided, which help direct injection jets E striking the combustion chamber bottom 4 away from the cylinder 5 into the piston recess 11. In Fig. 7, E, the fuel injection jets of the injector 9 are indicated.
    In order to achieve a good Tumbleführung, the side walls 17 are guided in the widest possible range in the direction of a transverse axis formed by the intersection by the plane of symmetry ε with the normal plane 16 transverse axis 22, so that the side walls 17 with the transverse axis 22 an angle p <30 ° span.
    In order to enable a simple production of the piston 6, the piston recess bottom lia is flat in a central, approximately circular region 23 of at least 10 mm and falling from the inlet side, so that a riser can be accommodated in the casting production of the piston 6. The height h of the intersection in the Steigerbearbeitung in which there is no positive step, is a maximum of 2 mm as indicated in Fig. 9.
    The shape of the piston recess 11 is selected so that, together with the roof shape of the combustion chamber ceiling 2, a harmonic cross-sectional profile of the ignition source 9 to the edge of the combustion chamber roof 2, wherein the minimum distance between the combustion chamber bottom 4 in the region of the piston edge 12 and
    Combustor roof 2 at any point of the piston 6 3 mm below.
    The described shape of the combustion chamber 1 ensures optimal flame propagation, the preservation of the residual tumble motion T in the combustion chamber 1 being promoted. 7/16
    权利要求:
    Claims (10)
    [1]
    7. PATENT CLAIMS 1. Combustion chamber (1) for an internal combustion engine having a roof-shaped combustion chamber ceiling (2) formed by a cylinder head (3) and a combustion chamber bottom (4) formed by a piston (6), with a substantially center in the combustion chamber ceiling ( 2) arranged ignition source (9) and one in the combustion chamber ceiling (2) arranged - preferably lateral -injection device (13), wherein the combustion chamber bottom (4) partially by a in the piston (6) arranged piston recess (11) is formed, characterized that distance (a) between the combustion chamber ceiling (2) and the combustion chamber bottom (4) - starting from a maximum distance (amax) in the ignition source (9) - in at least the piston pin (x) and / or 90 ° to the piston pin ( x), preferably in each radial direction, to the piston edge (12) towards continuously decreases, wherein preferably the distance (a) in the direction of 90 ° to an imaginary central reference surface (22) between the combustion chamber ceiling (2) un d piston (6) is measured.
    [2]
    2. combustion chamber (1) according to claim 1, characterized in that the combustion chamber bottom (4) in the ignition source (9) is designed so that at the top dead center of the piston (6) an inscribed fictitious ball (K) can be arranged, the Diameter corresponds to the maximum distance (amax) between the combustion chamber ceiling (2) and the combustion chamber bottom (4).
    [3]
    3. combustion chamber (1) according to claim 1 or 2, characterized in that the minimum distance (amin) in the region of the piston edge (12) of the piston (6) is at least 3 mm.
    [4]
    4. combustion chamber (1) according to one of claims 1 to 3, characterized in that the ratio of the maximum distance (amax) between the combustion chamber ceiling (2) and combustion chamber bottom (4) to the cylinder radius (R) about 0.3 to 0.55, preferably 0.35 to 0.5 mm.
    [5]
    5. combustion chamber (1) according to one of claims 1 to 4, characterized in that one of a tangent (tw) of the injection device at top dead center opposite rear wall (14) 8/16 of the piston recess (11) and the cylinder axis (10 ) spanned angle (ß) between 0 ° and 30 °, preferably between 5 ° and 30 °.
    [6]
    6. combustion chamber (1) according to one of claims 1 to 5, characterized in that the combustion chamber bottom (4) in a to the rear wall (14) outside the piston recess (11) adjoining region (15) to the piston recess (11) formed sloping down is, wherein preferably a tangent (ti5) of the sloping region (15) with a normal plane (16) on the cylinder axis (10) forms an angle (γ) between 5 ° and 15 °.
    [7]
    7. combustion chamber (1) according to one of claims 1 to 6, characterized in that the combustion chamber bottom (4) is executed free of undercuts or steps.
    [8]
    8. combustion chamber (1) according to one of claims 1 to 7, dadu rch in that at least one tangent (ti7) on a side wall (17) of the piston recess (11), which adjoins the rear wall (14) laterally, with a Normalben (16) on the cylinder axis (10) an angle (δ)> 30 °, preferably> 45 °.
    [9]
    9. combustion chamber (1) according to one of claims 1 to 7, characterized in that the piston recess bottom (4) in a central, substantially circular region (23) of at least 10 mm in diameter is flat.
    [10]
    10. combustion chamber (1) according to one of claims 1 to 9, characterized in that the combustion chamber bottom (4) in the region of the inlet valves and / or outlet valves valve pockets (19, 20), preferably between at least one valve pocket (20) and a Side wall (17) of the piston recess (11) has a chamfer (21) is formed. 2013 03 13 Fu / Bt
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    同族专利:
    公开号 | 公开日
    AT514021B1|2015-01-15|
    DE102014103301A1|2014-09-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0132996A1|1983-07-29|1985-02-13|Amoco Corporation|Improved system and process for producing and recovering elemental sulfur|
    DE102004051825A1|2003-10-24|2005-07-21|Mitsubishi Jidosha Kogyo K.K.|Combustion chamber construction in an internal combustion engine|
    JP2008057479A|2006-09-01|2008-03-13|Hitachi Ltd|Direct injection engine|
    JP2008202577A|2007-02-22|2008-09-04|Toyota Motor Corp|Internal combustion engine|
    JP2010180821A|2009-02-06|2010-08-19|Toyota Motor Corp|Piston for internal combustion engine|
    DE102011077342A1|2010-06-24|2011-12-29|Ford Global Technologies, Llc|Flat piston recess and injector jet for a gasoline engine with direct injection|
    DE102011106803A1|2011-07-06|2013-01-10|Audi Ag|Internal combustion engine e.g. diesel engine for motor vehicle, has injection valve that is provided for injecting fuel into cylinder in direction of combustion chamber recess of piston|
    AT6104U1|2002-05-07|2003-04-25|Avl List Gmbh|METHOD FOR OPERATING A 4-STROKE IGNITION COMBUSTION ENGINE|DE202014009051U1|2014-11-15|2016-02-16|GM Global Technology Operations LLC |Piston for an internal combustion engine and internal combustion engine with such a piston|
    DE102016007279A1|2016-06-15|2017-12-21|Audi Ag|Piston for an internal combustion engine and corresponding internal combustion engine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50173/2013A|AT514021B1|2013-03-13|2013-03-13|Combustion chamber for an internal combustion engine|ATA50173/2013A| AT514021B1|2013-03-13|2013-03-13|Combustion chamber for an internal combustion engine|
    DE102014103301.9A| DE102014103301A1|2013-03-13|2014-03-12|Combustion chamber for an internal combustion engine|
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