CN115217571B - Engine exhaust structure and engine - Google Patents
Engine exhaust structure and engine Download PDFInfo
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- CN115217571B CN115217571B CN202210261543.3A CN202210261543A CN115217571B CN 115217571 B CN115217571 B CN 115217571B CN 202210261543 A CN202210261543 A CN 202210261543A CN 115217571 B CN115217571 B CN 115217571B
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 21
- 230000007423 decrease Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 description 5
- 230000001154 acute effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention provides an engine exhaust structure and an engine, the engine exhaust structure comprises an exhaust passage, an exhaust valve and an exhaust valve seat ring which are arranged in a cylinder cover, wherein an inner hole of the exhaust valve seat ring and the exhaust passage form an exhaust path communicated with a combustion chamber, one end of the exhaust path, which is close to the combustion chamber, is provided with an exhaust throat straight line part, and an exhaust throat arc part which is connected with the lower stream of the exhaust throat straight line part along the exhaust direction; the exhaust throat straight portion extends linearly along the exhaust direction, and the inner diameter of the exhaust throat arc portion is reduced along the exhaust direction. The engine exhaust structure can facilitate high-temperature exhaust gas to flow outwards along an exhaust path, and can improve the exhaust performance of the engine.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine exhaust structure. The invention also relates to an engine with the exhaust structure.
Background
With the increasing strictness of automobile emission regulations, the technology of integrating an exhaust manifold by a cylinder cover is generated in order to meet emission requirements and reduce the production cost of the whole engine. By integrating the exhaust manifold with the cylinder head and thereby forming the exhaust passage in the cylinder head, it is possible to control the exhaust gas temperature within an acceptable range for the whole vehicle exhaust system in the case of no rich mixture, or slightly rich mixture, in the high-speed, high-load operation region of the engine.
Compared with the prior method of limiting the exhaust temperature by purely relying on the rich mixture, the cylinder head integrated exhaust manifold can reduce the oil consumption by about 10% -30%, so that the cylinder head integrated exhaust manifold has become an important measure for realizing low-carbon emission of an engine. In addition, through the integrated exhaust manifold of cylinder head, can save traditional exhaust manifold, also can greatly reduced manufacturing cost, and then promote the competitiveness of product.
However, the cylinder head of the integrated exhaust manifold is currently considered mainly in terms of spatial arrangement, as long as it is capable of exhausting the exhaust gas for the integrated exhaust manifold structure. This results in no corresponding improvement in engine exhaust performance despite the integration of the exhaust manifold, which also affects the achievement of the engine's emissions rating.
Disclosure of Invention
In view of this, the present invention aims to propose an engine exhaust structure that is capable of improving the exhaust performance of an engine.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
an engine exhaust structure comprises an exhaust passage, an exhaust valve and an exhaust valve seat ring, wherein the exhaust passage, the exhaust valve and the exhaust valve seat ring are arranged in a cylinder cover, and an inner hole of the exhaust valve seat ring and the exhaust passage form an exhaust path communicated with a combustion chamber;
an exhaust throat straight line part is formed at one end of the exhaust path, which is close to the combustion chamber, and an exhaust throat arc part which is connected to the downstream of the exhaust throat straight line part along the exhaust direction;
the exhaust throat straight portion extends linearly along the exhaust direction, and the inner diameter of the exhaust throat arc portion is reduced along the exhaust direction.
Further, the arc surface of the exhaust throat is an arc surface, and the value of the curvature radius r1 of the arc surface of the exhaust throat is not greater than the value of an included angle a1 between the central line z2 of the exhaust valve and the central line z1 of the cylinder.
Further, the extension length h1 of the straight line part of the exhaust throat opening satisfies the following conditions: h1 is more than or equal to 3mm and less than or equal to 15mm; and/or the exhaust throat straight part is positioned in the exhaust valve seat ring, or the exhaust throat straight part is positioned in the exhaust passage, or the exhaust throat straight part is partially positioned in the exhaust valve seat ring, and the exhaust throat straight part is partially positioned in the exhaust passage.
Further, the inner diameter d1 of the straight line portion of the exhaust throat satisfies: d1 is more than or equal to 0.2D and less than or equal to D2 is more than or equal to 0.4D, wherein D2 is the inner diameter of an inner hole of an intake valve seat ring, and D is the inner diameter of a cylinder.
Further, the included angle a1 between the central line z2 of the exhaust valve and the central line z1 of the cylinder satisfies the following conditions: a1 is more than or equal to 10 degrees and less than or equal to 30 degrees.
Further, a lower conical surface of the exhaust seat ring, a middle conical surface of the exhaust seat ring and an upper conical surface of the exhaust seat ring which are sequentially connected are arranged in the inner hole of the exhaust seat ring;
the lower conical surface of the exhaust seat ring is positioned at one end of the inner hole connected with the combustion chamber, and the inner diameters of the lower conical surface of the exhaust seat ring, the middle conical surface of the exhaust seat ring and the conical surface of the exhaust seat ring are gradually reduced along the exhaust direction.
Further, the cone angle a2 of the lower conical surface of the exhaust seat ring meets the following conditions: a2 is smaller than 130 degrees, and the cone angle a3 of the conical surface on the exhaust seat ring meets the following conditions: a3 is more than or equal to 20 degrees and less than or equal to 80 degrees.
Further, along the exhaust direction, the exhaust passage is internally provided with an upper profile of the exhaust throat connected to the lower stream of the cambered surface of the exhaust throat, the upper profile of the exhaust throat is a cambered surface, and the curvature radius r2 of the upper profile of the exhaust throat meets the following conditions: d is less than or equal to r2 and less than or equal to 2.5D, wherein D is the inner diameter of the cylinder.
Further, the exhaust passage is internally provided with an exhaust throat lower contour which is arranged opposite to the exhaust throat upper contour, the exhaust throat lower contour is arranged in an inclined manner along the exhaust direction, and an included angle a4 between the exhaust throat lower contour and the bottom surface of the cylinder cover meets the following conditions: a4 is more than or equal to 25 degrees and less than or equal to 50 degrees.
Compared with the prior art, the invention has the following advantages:
according to the engine exhaust structure, through the arrangement of the straight line part of the exhaust throat and the arc part of the exhaust throat close to the combustion chamber, on one hand, the straight line part of the exhaust throat can enable high-temperature exhaust gas to stably flow in a section of constant channel so as to effectively prevent gas flow separation, and on the other hand, the arc part of the exhaust throat can be used for converging exhaust gas to the central position of the exhaust passage so as to increase the flow velocity of the central position of the exhaust passage and drive surrounding gas to flow outwards so as to guide the gas which stably flows in the straight line part of the exhaust throat to the outlet of the exhaust passage. Therefore, the engine exhaust structure can facilitate high-temperature exhaust gas to flow outwards along an exhaust path, can improve the engine exhaust performance, and has good practicability.
The invention also provides an engine, and the cylinder head of the engine is provided with the engine exhaust structure.
Compared with the prior art, the engine and the exhaust structure of the engine have the same beneficial effects and are not repeated here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic illustration of an exhaust and intake configuration for a single cylinder location in an engine according to an embodiment of the present disclosure;
FIG. 2 is a cross-sectional view of the position A-A of FIG. 1;
FIG. 3 is an enlarged view of a portion of the structure shown in FIG. 2;
FIG. 4 is a schematic view of an exhaust valve seat insert according to an embodiment of the present invention;
reference numerals illustrate:
1. a cylinder head; 2. an intake valve guide; 3. an air inlet channel; 4. an intake valve; 5. a cylinder; 6. a combustion chamber; 7. an exhaust passage; 8. an exhaust valve conduit; 9. an exhaust valve;
71. an exhaust valve seat ring; 72. an upper conical surface of the exhaust seat ring; 73. a middle conical surface of the exhaust seat ring; 74. the lower conical surface of the exhaust seat ring; 75. an exhaust throat straight portion; 76. an exhaust laryngeal arc face; 77. an upper profile of the exhaust throat; 78. the lower profile of the exhaust laryngeal opening.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be noted that, if terms indicating an orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are presented, they are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in combination with specific cases.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
The present embodiment relates to an engine exhaust structure, and mainly relates to an improvement of an exhaust structure in an engine, where the engine of the present embodiment is an automobile engine, and specifically is an engine with an exhaust manifold integrated in a cylinder head, and the present embodiment can facilitate high-temperature exhaust gas flowing outward along an exhaust path by setting the exhaust structure as follows, so that exhaust performance of the engine can be improved.
The exhaust structure of the present embodiment includes, in its entire design, the exhaust passage 7, the exhaust valve 9, and the exhaust valve seat ring 71 provided in the cylinder head 1, as shown in conjunction with fig. 1 to 3. Wherein the inner bore of the exhaust valve seat 71 and the exhaust passage 7 form an exhaust path communicating with the combustion chamber 6, and wherein the exhaust valve 9 is opened during the exhaust stroke of the engine, and the high temperature exhaust gas is discharged into the downstream turbocharger or exhaust system through the exhaust path.
Further, in addition to the exhaust passage 7, the exhaust valve 9, and the exhaust valve seat ring 71 described above, an intake passage 3, an intake valve 4, an intake valve seat ring, and the like are also provided in the cylinder head 1, similarly to the related structures in the existing engine. Moreover, the inner bore of the intake valve seat ring and the intake duct 3 constitute an intake path communicating with the combustion chamber 6, and the center line z3 of the intake valve 4 and the center line z2 of the exhaust valve 9 are each arranged obliquely with respect to the center line z1 of the cylinder 5, and are distributed on both sides of the center line z 1. At the same time, the inlet valve 4 is also slidably arranged in the inlet valve duct 2, and the outlet valve 9 is slidably arranged in the outlet valve duct 8.
In the exhaust path constituted by the engine exhaust structure of the present embodiment, an exhaust throat straight portion 75 is formed near one end of the combustion chamber 6, that is, at one end where the exhaust valve seat 71 is provided, and an exhaust throat arc portion 76 connected downstream of the exhaust throat straight portion 75 in the exhaust direction. Wherein, the exhaust throat straight portion 75 extends linearly along the exhaust direction, the inner diameter of the exhaust throat arc portion 76 decreases along the exhaust direction, and the extension length h1 of the exhaust throat straight portion 75 satisfies: h1 is more than or equal to 3mm and less than or equal to 15mm.
Specifically, the extension length h1 of the above-mentioned exhaust throat straight portion 75 may be set to 3mm, 5mm, 8mm, 10mm, 12mm or 15mm, for example. Meanwhile, in this embodiment, by the arrangement of the linearly extending exhaust throat linear portion 75, and making the length thereof within the above range, the high-temperature exhaust gas in the area can be effectively ensured to flow stably in a constant channel, and further the flow separation of the gas can be effectively prevented, so that the high-temperature exhaust gas flows smoothly downstream.
In addition, in addition to the above length section, the inventors found that it was difficult to achieve the effect of stabilizing the air flow when the length of the exhaust throat straight portion 75 was too small. If the length of the exhaust throat straight portion 75 is too large, a large space is occupied, which affects the overall structural arrangement of the cylinder head 1, and further, the cylinder head 1 is too large and too heavy, so that the engine fuel consumption and the cost increase.
In this embodiment, as one of the embodiments, still referring to fig. 3, the exhaust throat straight portion 75 may be partially located in the exhaust valve seat ring 71, and partially located in the exhaust passage 7. At this time, a part of the inner hole of the exhaust valve seat ring 71 forms a part of the exhaust throat straight portion 75, and another part of the exhaust throat straight portion 75 is formed in the exhaust passage 7. The portion located in the exhaust valve seat ring 71 communicates end to end with the portion located in the exhaust passage 7 to together form an integral exhaust throat straight portion 75.
However, in addition to the exhaust gas throat straight portion 75 being distributed over the exhaust passage 7 and the exhaust valve seat ring 71, it is of course also possible to provide only the exhaust gas throat straight portion 75 in the exhaust valve seat ring 71 when the axial dimension of the exhaust valve seat ring 71 is large. Alternatively, when the axial dimension of the exhaust valve seat 71 is small or the inner hole of the exhaust valve seat 71 does not extend linearly, it is also possible to provide only the exhaust throat linear portion 75 in the exhaust passage 7. Also note that when the exhaust valve seat ring 71 is partially embedded on the inner wall of the exhaust passage 7 such that the portion of the exhaust passage 7 coincides with the partial inner hole of the exhaust valve seat ring 71, at this time, it can still be regarded that the exhaust throat straight portion 75 is provided in the exhaust valve seat ring 71.
In this embodiment, in order to ensure that the high-temperature exhaust gas combusted in the cylinder 5 can be effectively discharged within a defined time, the inner diameter d1 of the exhaust throat straight portion 75 is also set so as to satisfy: d1 is more than or equal to 0.2D and d2 is more than or equal to 0.4D. Where D2 is the inner diameter of the inner bore of the intake valve seat insert and D is the inner diameter of the cylinder 5.
The inventors found that the above arrangement of the ranges of the inner diameters d1, d2 does not affect the formation of the mixture and the combustion state while not affecting the entry of fresh air into the combustion chamber 6 in the intake duct 3. At the same time, the arrangement of the above range can also facilitate the smooth discharge of the high-temperature exhaust gas formed by combustion out of the combustion chamber 6, so as to facilitate the intake flow of fresh air for the next cycle.
By arranging the arc surface portion 76 of the exhaust throat with the inner diameter reduced along the exhaust direction, the embodiment can converge the high-temperature exhaust gas to the central position of the exhaust passage 7 on the basis of the straight line portion 75 of the exhaust throat, increase the flow velocity of the central position of the exhaust passage 7, and drive the surrounding gas to flow outwards so as to guide the high-temperature exhaust gas flowing stably in the straight line portion 75 of the exhaust throat to the outlet of the exhaust passage 7.
Also, as a preferred embodiment, the exhaust throat cambered surface portion 76 of the present embodiment may be specifically provided as an arc surface, and the value of the radius of curvature r1 of the exhaust throat cambered surface portion 76 is not greater than the value of the angle a1 between the center line z2 of the exhaust valve 9 and the center line z1 of the cylinder 5. Specifically, for example, when the angle a1 is 20 ° as described below, the value of the radius of curvature r1 should be not more than 20. Of course, it means that the radius of curvature r1 of the exhaust throat arcuate surface portion 76 should be not more than 20mm.
By making the value of the radius of curvature r1 of the exhaust throat arc surface portion 76 not larger than the value of the included angle a1, the inventors found that it is possible to adjust the trend of the high-temperature exhaust gas through the exhaust throat arc surface portion 76 and thereby to better converge the high-temperature exhaust gas toward the center of the exhaust passage 7, increase the high-temperature exhaust gas at the center position, and improve the exhaust gas flow performance.
In the specific design of this embodiment, the included angle a1 between the central line z2 of the exhaust valve 9 and the central line z1 of the cylinder 5 may satisfy: a1 is more than or equal to 10 degrees and less than or equal to 30 degrees, and preferably satisfies the following conditions: a1 is more than or equal to 18 degrees and less than or equal to 20 degrees. By adopting the above-described angle range, the exhaust valve 9 is made to be biased toward the intake side of the engine, and the inventors have also found that it is possible to effectively use the tapered surface structure of the valve disc portion of the exhaust valve 9 to guide the flow of gas, so that it is possible to facilitate better discharge of the high-temperature exhaust gas in the combustion chamber 6.
In specific implementation, the included angle a1 may be, for example, 18 °, 19 °, or 20 °, but it may also be 10 °, 15 °, 16 °, or 22 °, 25 °, 30 °, or the like.
In this embodiment, the gas flow area is increased to facilitate the discharge of high temperature exhaust gas in the cylinder 5, and as a preferred embodiment, the inner hole of the exhaust valve seat 71 is also provided with a lower cone 74 of the exhaust valve seat, a middle cone 73 of the exhaust valve seat, and an upper cone 72 of the exhaust valve seat, which are sequentially connected.
At this time, in combination with fig. 4, the exhaust seat lower tapered surface 74 is located at one end of the inner bore near the combustion chamber 6, and the inner diameters of the exhaust seat lower tapered surface 74, the exhaust seat middle tapered surface 73, and the exhaust seat upper tapered surface 72 gradually decrease in the exhaust direction. In a specific design, the taper angle a2 of the lower tapered surface 74 of the exhaust seat ring may be an obtuse angle, and the taper angle a3 of the tapered surface 72 of the exhaust seat ring may be an acute angle.
By providing the tapered surfaces with the inner diameters gradually decreasing in the exhaust direction, the tapered surface of the lower tapered surface 74 of the exhaust seat is also made to spread toward the combustion chamber 6 as shown in fig. 3. The cone angle a2 matched with the lower cone surface 74 of the exhaust seat ring is an obtuse angle, which is convenient for collecting more high-temperature exhaust gas in the cylinder 5, and meanwhile, the movement of fresh gas-oil mixture in the combustion chamber 6 is not influenced.
In addition, the cone angle a3 of the conical surface 72 on the exhaust seat ring is made to be an acute angle, so that the conical surface of the conical surface 72 on the exhaust seat ring extends towards the throat of the exhaust passage 7, the flow speed of the high-temperature exhaust gas can be improved by controlling the flow area in the exhaust seat ring 71, and meanwhile, the high-temperature exhaust gas can be effectively promoted to flow towards the central position of the throat passage, so that the wall flow loss is reduced.
In the embodiment, the taper angle a2 of the lower taper surface 74 of the exhaust seat insert using the obtuse angle may be set to satisfy: a2 < 130 °, and for example, 95 °, 100 °, 115 °, 120 °, 125 °, etc. may be used. And the taper angle a3 of the taper surface 72 on the exhaust seat may be set so as to satisfy: a3 is 20 DEG to 80 DEG, and it may be, for example, 20 DEG, 22 DEG, 25 DEG, 30 DEG, 40 DEG, 50 DEG, 60 DEG, 65 DEG, 70 DEG or 80 DEG, etc.
Referring again to fig. 3, as a preferred embodiment, the exhaust passage 7 of the present embodiment also has an upper exhaust throat contour 77 connected downstream of the cambered surface portion 76 of the exhaust throat in the exhaust direction. The upper exhaust throat contour 77 is a cambered surface, and the radius of curvature r2 of the upper exhaust throat contour 77 satisfies: d is less than or equal to r2 and less than or equal to 2.5D, wherein D is the inner diameter of the cylinder 5.
At this time, by setting the radius of curvature r2 of the upper exhaust throat contour 77 in the above section, the upper exhaust throat contour 77 can be made to be a large-diameter arc surface. Therefore, the flow area of the exhaust throat part can be effectively increased, the flow capacity of the exhaust passage 7 is increased, high-temperature exhaust gas can be guided to flow in the center of the exhaust passage 7, the proportion of gas flowing along the wall surface of the air passage is reduced, and the energy loss caused by wall surface flow is reduced.
In addition, the arrangement of the upper profile 77 of the exhaust throat can increase the flow velocity of the high-temperature exhaust gas at the center of the exhaust passage 7, so that the high-temperature exhaust gas with high flow velocity at the center drives the surrounding high-temperature exhaust gas to flow, thereby improving the circulation capacity and flow coefficient of the exhaust passage 7, reducing the energy loss of the high-temperature exhaust gas and improving the utilization rate of the energy of the high-temperature exhaust gas.
In this embodiment, in addition to the above upper exhaust-throat contour 77, as a further preferred embodiment, a lower exhaust-throat contour 78 is provided in the exhaust passage 7, which is disposed opposite to the upper exhaust-throat contour 77. The lower exhaust throat profile 78 is also disposed obliquely upward in the exhaust direction in the exhaust passage 7, and the included angle a4 between the lower exhaust throat profile 78 and the bottom surface of the cylinder head 1 is specifically set so as to satisfy: a4 is more than or equal to 25 degrees and less than or equal to 50 degrees.
By providing the lower profile 78 of the exhaust throat with an upward inclination, the present embodiment can increase the exhaust speed of the high-temperature exhaust gas and increase the exhaust flow coefficient. Meanwhile, the inventor also found that by making the included angle a4 between the exhaust port lower contour 78 and the bottom surface of the cylinder head 1 in the above section, it can better guide the flow of the high-temperature exhaust gas near the wall surface of the exhaust throat lower contour 78 to the center position of the exhaust passage 7, and at the same time, it can also improve the flow speed of the high-temperature exhaust gas at the center position of the exhaust passage 7, reduce the interference of the rough wall of the air passage to the high-temperature exhaust gas, reduce the energy loss of the high-temperature exhaust gas, and facilitate the discharge of the high-temperature exhaust gas.
In a specific implementation, the included angle a4 may be, for example, 25 °, 30 °, 32 °, 35 °, 40 °, 45 °, or 50 °.
According to the exhaust structure of the embodiment, through the arrangement of the straight line part 75 of the exhaust throat, the arc part 76 of the exhaust throat, the upper outline 77 of the exhaust throat, the lower outline 78 of the exhaust throat and the conical surfaces of the exhaust valve seat ring 71, and through the arrangement of specific parameters of the structures, the exhaust structure can facilitate the discharge of high-temperature exhaust gas along an exhaust path, can improve the exhaust performance of an engine, realizes the exhaust requirement of high flow coefficient, and has good practicability.
The present embodiment also relates to an engine in which the above-described engine exhaust structure is provided in the cylinder head 1.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. An engine exhaust structure comprising an exhaust passage (7), an exhaust valve (9) and an exhaust valve seat ring (71) provided in a cylinder head (1), an inner hole of the exhaust valve seat ring (71) and the exhaust passage (7) constituting an exhaust path communicating with a combustion chamber (6), characterized in that:
an exhaust throat straight portion (75) is formed at one end of the exhaust path near the combustion chamber (6), and an exhaust throat arc portion (76) connected downstream of the exhaust throat straight portion (75) in the exhaust direction;
the exhaust throat straight portion (75) extends straight in the exhaust direction, and the inner diameter of the exhaust throat arc portion (76) decreases in the exhaust direction;
the exhaust throat arc surface part (76) is an arc surface, and the value of the curvature radius r1 of the exhaust throat arc surface part (76) is not more than the value of an included angle a1 between the central line z2 of the exhaust valve (9) and the central line z1 of the cylinder (5);
the included angle a1 between the central line z2 of the exhaust valve (9) and the central line z1 of the cylinder (5) meets the following conditions: a1 is more than or equal to 10 degrees and less than or equal to 30 degrees; the extension length h1 of the exhaust throat straight part (75) satisfies the following conditions: h1 is more than or equal to 3mm and less than or equal to 15mm;
along the exhaust direction, exhaust passage (7) is interior to have and to connect exhaust laryngeal upper outline (77) of exhaust laryngeal face (76) low reaches, exhaust laryngeal upper outline (77) are the cambered surface, just the radius of curvature r2 of exhaust laryngeal upper outline (77) satisfies: d is not less than r2 and not more than 2.5D, wherein D is the inner diameter of the cylinder (5);
the exhaust passage (7) is internally provided with an exhaust throat lower contour (78) which is arranged opposite to the exhaust throat upper contour (77), the exhaust throat lower contour (78) is arranged along the exhaust direction in an inclined way, and an included angle a4 between the exhaust throat lower contour (78) and the bottom surface of the cylinder cover (1) meets the following conditions: a4 is more than or equal to 25 degrees and less than or equal to 50 degrees.
2. The engine exhaust structure according to claim 1, characterized in that:
the exhaust throat straight portion (75) is located in the exhaust valve seat ring (71), or the exhaust throat straight portion (75) is located in the exhaust passage (7), or the exhaust throat straight portion (75) is located in the exhaust valve seat ring (71) partially and the exhaust passage (7) partially.
3. The engine exhaust structure according to claim 2, characterized in that:
the inner diameter d1 of the exhaust throat straight part (75) satisfies the following conditions: d1 is more than or equal to 0.2D and less than or equal to D2 is more than or equal to 0.4D, wherein D2 is the inner diameter of an inner hole of an inlet valve seat ring, and D is the inner diameter of a cylinder (5).
4. The engine exhaust structure according to claim 1, characterized in that:
an exhaust seat ring lower conical surface (74), an exhaust seat ring middle conical surface (73) and an exhaust seat ring upper conical surface (72) which are sequentially connected are arranged in the inner hole of the exhaust seat ring (71);
the exhaust seat ring lower conical surface (74) is positioned at one end of the inner hole, which is close to the combustion chamber (6), and the inner diameters of the exhaust seat ring lower conical surface (74), the exhaust seat ring middle conical surface (73) and the exhaust seat ring conical surface (72) are gradually reduced along the exhaust direction.
5. The engine exhaust structure according to claim 4, characterized in that:
the cone angle a2 of the lower cone surface (74) of the exhaust seat ring meets the following conditions: a2 is less than 130 DEG, and the taper angle a3 of the conical surface (72) on the exhaust seat ring meets the following conditions: a3 is more than or equal to 20 degrees and less than or equal to 80 degrees.
6. An engine, characterized in that: an engine exhaust structure according to any one of claims 1 to 5 is provided in a cylinder head (1) of the engine.
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| CN202210261543.3A CN115217571B (en) | 2022-03-16 | 2022-03-16 | Engine exhaust structure and engine |
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| CN202210261543.3A CN115217571B (en) | 2022-03-16 | 2022-03-16 | Engine exhaust structure and engine |
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| CN115217571B true CN115217571B (en) | 2024-03-19 |
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| CN212615059U (en) * | 2020-04-03 | 2021-02-26 | 长城汽车股份有限公司 | Exhaust valve seat ring, cylinder cover assembly and engine |
| CN113404586A (en) * | 2021-08-19 | 2021-09-17 | 潍柴动力股份有限公司 | Combustion chamber and gas engine |
| CN114033589A (en) * | 2021-11-16 | 2022-02-11 | 蜂巢动力***(江苏)有限公司 | Engine air inlet structure, engine and automobile |
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| JP2016160927A (en) * | 2015-03-05 | 2016-09-05 | マツダ株式会社 | Exhaust passage structure of engine |
| WO2017114137A1 (en) * | 2015-12-29 | 2017-07-06 | 重庆志成机械有限公司 | Valve seat structure for cylinder head of motorcycle engine |
| CN212615059U (en) * | 2020-04-03 | 2021-02-26 | 长城汽车股份有限公司 | Exhaust valve seat ring, cylinder cover assembly and engine |
| CN113404586A (en) * | 2021-08-19 | 2021-09-17 | 潍柴动力股份有限公司 | Combustion chamber and gas engine |
| CN114033589A (en) * | 2021-11-16 | 2022-02-11 | 蜂巢动力***(江苏)有限公司 | Engine air inlet structure, engine and automobile |
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| CN115217571A (en) | 2022-10-21 |
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