CN111379649A - Intake duct applied to high-compression-ratio direct-injection self-priming internal combustion engine - Google Patents
Intake duct applied to high-compression-ratio direct-injection self-priming internal combustion engine Download PDFInfo
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- CN111379649A CN111379649A CN202010208616.3A CN202010208616A CN111379649A CN 111379649 A CN111379649 A CN 111379649A CN 202010208616 A CN202010208616 A CN 202010208616A CN 111379649 A CN111379649 A CN 111379649A
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- Prior art keywords
- air inlet
- inlet channel
- intake duct
- throat
- valve guide
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
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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
- F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
- F02F1/4235—Shape or arrangement of intake or exhaust channels in cylinder heads of intake channels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention relates to an air inlet channel applied to a high compression ratio direct injection self-absorption internal combustion engine, which comprises an air inlet channel obliquely connected with a cylinder cover and an air valve guide pipe connected with the air inlet channel, wherein the air inlet channel is provided with an upper side surface, a lower side surface, an inlet part and an outlet part, the air valve guide pipe is connected with the lower part of the upper side surface, an included angle β between a first central line of the air inlet channel and a second central line of the air valve guide pipe is 35-50 degrees, the distance H between the inlet center of the air inlet channel and the lower surface of the cylinder cover is 45-60 mm, the part of the lower side surface corresponding to the inlet part of the air inlet channel is parallel to the first central line, a necking throat structure is arranged at the part of the lower side surface connected with the cylinder cover, and the included angle gamma between the throat trimming surface of the throat structure and the part of the lower side surface connected with the cylinder cover is 75-95 degrees.
Description
Technical Field
The invention relates to an automobile internal combustion engine, in particular to an air inlet channel applied to a high-compression-ratio direct-injection self-absorption internal combustion engine.
Background
In recent years, fuel consumption regulations are continuously tightened, and high compression ratio direct injection is a main technical route for solving the challenge of the self-priming engine. The engine is configured with a high compression ratio (generally more than 11.5), so that the oil consumption can be greatly reduced, but the problem of knocking can be caused, and one of effective ways for inhibiting knocking is to obtain higher tumble flow intensity through an air inlet channel design, promote turbulent kinetic energy in a cylinder, accelerate combustion and inhibit knocking.
The emission standard of the national VI of automobiles is implemented in 7 months in 2020, the emission indexes of gas and particulate matters are obviously tightened, and the engine is required to have strong heating capacity on a catalytic converter after being started and cannot generate excessive soot emission. The engine is required to organize good airflow movement through a special air inlet channel design, so that the combustion stability of the engine can be enhanced, the phenomenon that direct injection fuel is in contact with a cylinder wall to generate wet wall can be avoided, and the soot is well controlled.
The key mode for organizing good air flow movement is to improve the tumble of an air inlet channel, the maximum tumble strength is usually only concerned with common air channel structures, for a high-compression-ratio direct injection self-priming engine, the tumble mainly comes from the structure of the air inlet channel, the tumble strength of the low air inlet lift range is also enhanced while the maximum tumble strength is realized through special design under the combination of an engineering boundary, and a certain level of the maximum tumble level is reached.
CN207437238U discloses "high tumble ratio inlet structure", it includes inlet duct body, sprayer, the air gets into by the air intlet of this inlet duct body, with the oil spraying of sprayer spun mixes the back in this inlet duct body, enters into to the combustion cylinder through the valve throat of this inlet duct body in its characterized in that: the intake duct body by air intlet is including the first section of admitting air, the middle section of admitting air and the end section of admitting air in proper order to valve throat orientation, wherein, the first section of admitting air, the middle section of admitting air, the end section of admitting air all are arc channel structure, and should admit air the first section, admit air the middle section, admit air the end section and communicate and smooth transition in proper order, the end section of admitting air extremely valve throat position is necking down structure. The tumble ratio is improved, so that air and oil in the cylinder are fully mixed in a spraying mode, combustion is uniform, and the engine obtains stronger power. This is, of course, a beneficial attempt in the art.
Disclosure of Invention
The invention aims to provide an air inlet channel applied to a high-compression-ratio direct-injection self-absorption internal combustion engine, which can meet the air inlet flow rate under the boundary condition of a certain cylinder cover, realize high tumble strength (containing low air inlet lift and high tumble strength), inhibit knocking, control soot well, ensure the combustion stability, reduce oil consumption and meet the requirements of the national VI standard of automobiles.
The invention relates to an air inlet channel applied to a high compression ratio direct injection self-absorption internal combustion engine, which comprises an air inlet channel obliquely connected with a cylinder cover and an air valve guide pipe connected with the air inlet channel; the air inlet channel is provided with an upper side surface, a lower side surface, an inlet part and an outlet part; the valve guide pipe is connected with the lower part of the upper side surface;
an included angle β between a first central line of the air inlet channel and a second central line of the valve guide pipe is 35-50 degrees, and the distance H between the center of an inlet of the air inlet channel and the lower surface of the cylinder cover is 45-60 mm;
the lower side surface and the part corresponding to the inlet part of the air inlet channel are parallel to the first central line; the part of the lower side surface connected with the cylinder cover is provided with a necking-shaped throat structure, and the included angle gamma between the throat-shaped surface of the throat structure and the part of the lower side surface connected with the cylinder cover is 75-95 degrees.
Further, the lower side surface and the corresponding part between the inlet part and the throat structure are provided with a fish belly structure with smooth transition.
In one preferable scheme, an included angle β between a first central line of the air inlet channel and a second central line of the valve guide pipe is 35 degrees, the distance H between the center of an inlet of the air inlet channel and the lower surface of the cylinder cover is 60mm, and an included angle gamma between the throat port modifying surface and a part, connected with the lower side surface and the cylinder cover, is 75 degrees.
In a second preferred scheme, an included angle β between a first central line of the air inlet channel and a second central line of the valve guide pipe is 50 degrees, the distance H between the center of an inlet of the air inlet channel and the lower surface of the cylinder cover is 45mm, and an included angle gamma between the throat port modifying surface and a part, connected with the lower side surface and the cylinder cover, is 95 degrees.
Preferably, an included angle β between a first central line of the air inlet channel and a second central line of the valve guide pipe is 45 degrees, the distance H between the center of an inlet of the air inlet channel and the lower surface of the cylinder cover is 50mm, and an included angle gamma between the throat port modifying surface and a part, connected with the lower side surface and the cylinder cover, is 80 degrees.
The invention has the beneficial effects that:
(1) because the bent air inlet structure is changed into a straight-through structure, the first central line of the air inlet is in a straight line, and the air inlet flow directly enters the combustion chamber along the direction of the first central line, so that the tumble flow form is formed, the combustion rate is improved, the knocking is avoided, and the oil consumption and the emission of the high compression ratio engine are reduced;
(2) because the included angle between the first central line of the air inlet channel and the second central line of the valve guide pipe and the distance between the inlet center of the air inlet channel and the lower surface of the cylinder cover are optimized, the angle of the air inlet flow entering the combustion chamber is more reasonable.
(3) Because the upside of intake duct is parallel with the first central line of intake duct, is equipped with smooth transition's fish belly structure at the downside of intake duct, makes to form certain contained angle between intake duct downside and the throat profile, further promotes intake duct tumble strength.
(4) The invention improves the tumble strength of the air inlet channel by 27 percent compared with the common structure, and the tumble strength of the low air inlet lift reaches over 75 percent of the maximum strength; the fuel consumption of the whole engine is reduced by 8% and the emission reaches the national VI standard of automobiles when the fuel is applied to a direct injection self-priming internal combustion engine with a compression ratio of 13.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial enlarged view of section A (inlet throat) of FIG. 1;
FIG. 3 is a graph comparing the tumble strength of the present invention with that of a conventional inlet.
In the figure:
1-inlet channel, 11-first central line, 12-upper side, 13-lower side, 14-inlet part, 15-outlet part, 16-throat shaping surface, 17-fish belly structure.
2-valve guide, 21-second centre line;
and 3, cylinder cover.
Detailed Description
The present invention will be further described in detail with reference to the following drawings and examples, which are only for the purpose of illustration and are not to be construed as limiting the scope of the present invention.
The first embodiment is as follows:
referring to fig. 1 and 2, an intake duct applied to a high compression ratio direct injection self-priming internal combustion engine includes an intake duct 1 obliquely connected to a cylinder head 3, and a valve guide 2 connected to the intake duct 1; the inlet duct 1 has an upper side 12, a lower side 13, an inlet portion 14 and an outlet portion 15; the valve guide 2 is connected with the lower part of the upper side surface 12; the prominent substantive features are as follows:
an included angle β between a first central line 11 of the air inlet channel 1 and a second central line 21 of the valve guide 2 is 35 degrees, and the distance H between the center of an inlet of the air inlet channel 1 and the lower surface of the cylinder cover 3 is 60 mm;
the lower side surface 13 and the corresponding part of the inlet part 14 of the air inlet channel 1 are parallel to the first central line 11; the part that downside 13 and cylinder cap 3 link to each other is equipped with the throat structure that is the necking down form, the throat profile 17 of this throat structure with the contained angle gamma of the part that downside 13 and cylinder cap 3 link to each other is 75 to promote the intake duct and tumble flow intensity. In order to further improve the intake tumble strength, the bent intake passage structure is changed into a straight-through structure, the first central line of the intake passage is in a straight line, and the intake airflow directly enters the combustion chamber along the direction of the first central line, so that the tumble shape is favorably formed, the combustion rate is improved, the knocking is avoided, and the oil consumption and the emission of the high compression ratio engine are reduced. And the included angle between the first central line of the air inlet channel and the second central line of the valve guide pipe and the distance between the inlet center of the air inlet channel and the lower surface of the cylinder cover are optimized, so that the angle of the air inlet flow entering the combustion chamber is more reasonable.
The lower side surface 13 and the corresponding part between the inlet part 14 and the throat structure are provided with a fish belly structure 16 with smooth transition so as to further improve the tumble strength of the air inlet passage.
Second embodiment on the basis of the first embodiment, an included angle β between the first central line 11 of the air inlet channel 1 and the second central line 21 of the valve guide 2 is selected to be 50 degrees, a distance H between the center of the inlet of the air inlet channel 1 and the lower surface of the cylinder head 3 is selected to be 45mm, and an included angle gamma between a part connected with the lower side surface 13 and the cylinder head 3 is selected to be 75 degrees.
Third embodiment, on the basis of the first embodiment, an included angle β between a first central line 11 of the air inlet channel 1 and a second central line 21 of a valve guide 2 is 45 degrees, a distance H between the center of an inlet of the air inlet channel 1 and the lower surface of the cylinder cover 3 is 50mm, and an included angle gamma between a part connected with the lower side surface 13 and the cylinder cover 3 is 80 degrees.
The design can improve the tumble strength of the air inlet passage under the flow coefficient of the air inlet passage in a certain range.
Referring to fig. 3, the invention improves the tumble strength of the air inlet passage by 27% compared with the common structure, and the tumble strength of the low air inlet lift reaches over 75% of the maximum strength; the invention is applied to a direct injection self-absorption internal combustion engine with a compression ratio of 13, and realizes that the oil consumption of the whole engine is reduced by 8 percent and the emission reaches the national VI standard of automobiles.
Claims (5)
1. The air inlet channel applied to the high-compression-ratio direct-injection self-absorption internal combustion engine comprises an air inlet channel (1) obliquely connected with a cylinder cover (3) and an air valve guide pipe (2) connected with the air inlet channel (1), wherein the air inlet channel (1) is provided with an upper side surface (12), a lower side surface (13), an inlet part (14) and an outlet part (15), and the air valve guide pipe (2) is connected with the lower part of the upper side surface (12), and is characterized in that an included angle β between a first central line (11) of the air inlet channel (1) and a second central line (21) of the air valve guide pipe (2) is 35-50 degrees, and the distance H between the inlet center of the air inlet channel (1) and the lower surface of the cylinder cover (3) is;
the lower side surface (13) and the part corresponding to the inlet part (14) of the air inlet channel (1) are parallel to the first central line (11); the part where the lower side surface (13) is connected with the cylinder cover (3) is provided with a necking-shaped throat structure, and the included angle gamma between the throat trimming surface (17) of the throat structure and the part where the lower side surface (13) is connected with the cylinder cover (3) is 75-95 degrees.
2. The intake duct for a high compression ratio direct injection self-priming internal combustion engine according to claim 1, wherein: the lower side surface (13) and the corresponding part between the inlet part (14) and the throat structure are provided with a fish belly structure (16) with smooth transition.
3. The intake duct applied to the high compression ratio direct injection self-priming internal combustion engine according to claim 1 or 2, wherein an angle β between a first center line (11) of the intake duct (1) and a second center line (21) of the valve guide (2) is 35 °, a distance H between an inlet center of the intake duct (1) and a lower surface of the cylinder head (3) is 60mm, and an angle γ between the throat-modified surface (17) and a portion where the lower surface (13) and the cylinder head (3) are connected is 75 °.
4. The intake duct applied to the high compression ratio direct injection self-priming internal combustion engine according to claim 1 or 2, wherein an angle β between a first center line (11) of the intake duct (1) and a second center line (21) of the valve guide (2) is 50 °, a distance H between an inlet center of the intake duct (1) and a lower surface of the cylinder head (3) is 45mm, and an angle γ between the throat-modified surface (17) and a portion where the lower surface (13) and the cylinder head (3) are connected is 95 °.
5. The intake duct applied to the high compression ratio direct injection self-priming internal combustion engine according to claim 1 or 2, wherein an angle β between a first center line (11) of the intake duct (1) and a second center line (21) of the valve guide (2) is 45 °, a distance H between an inlet center of the intake duct (1) and a lower surface of the cylinder head (3) is 50mm, and an angle γ between the throat-modified surface (17) and a portion where the lower surface (13) and the cylinder head (3) are connected is 80 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010208616.3A CN111379649A (en) | 2020-03-23 | 2020-03-23 | Intake duct applied to high-compression-ratio direct-injection self-priming internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010208616.3A CN111379649A (en) | 2020-03-23 | 2020-03-23 | Intake duct applied to high-compression-ratio direct-injection self-priming internal combustion engine |
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| Publication Number | Publication Date |
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| CN111379649A true CN111379649A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010208616.3A Pending CN111379649A (en) | 2020-03-23 | 2020-03-23 | Intake duct applied to high-compression-ratio direct-injection self-priming internal combustion engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482813A (en) * | 2021-06-30 | 2021-10-08 | 东风汽车集团股份有限公司 | Air inlet channel, engine and vehicle |
| CN113982791A (en) * | 2021-11-16 | 2022-01-28 | 蜂巢动力***(江苏)有限公司 | Engine air inlet passage structure, engine and automobile |
| CN114109673A (en) * | 2021-11-25 | 2022-03-01 | 哈尔滨东安汽车动力股份有限公司 | High tumble inlet structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19820601A1 (en) * | 1997-05-14 | 1998-11-19 | Avl List Gmbh | Multi-cylinder engine with internal mixing |
| CN101660471A (en) * | 2009-09-24 | 2010-03-03 | 重庆长安汽车股份有限公司 | Petrol engine air inlet path |
| CN202520432U (en) * | 2012-04-12 | 2012-11-07 | 宁波市鄞州德来特技术有限公司 | Air passage structure of cylinder cover |
| CN205744119U (en) * | 2016-07-01 | 2016-11-30 | 重庆长安汽车股份有限公司 | A kind of inlet structure of direct spray petrol engine in cylinder |
| CN209195568U (en) * | 2018-12-29 | 2019-08-02 | 重庆长安汽车股份有限公司 | A kind of inlet structure, engine and automobile |
| CN209212376U (en) * | 2018-10-15 | 2019-08-06 | 奇瑞汽车股份有限公司 | Supercharged direct injection engine intake duct |
| CN209340068U (en) * | 2019-01-16 | 2019-09-03 | 江铃汽车股份有限公司 | A kind of high-performance air passage structure |
-
2020
- 2020-03-23 CN CN202010208616.3A patent/CN111379649A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19820601A1 (en) * | 1997-05-14 | 1998-11-19 | Avl List Gmbh | Multi-cylinder engine with internal mixing |
| CN101660471A (en) * | 2009-09-24 | 2010-03-03 | 重庆长安汽车股份有限公司 | Petrol engine air inlet path |
| CN202520432U (en) * | 2012-04-12 | 2012-11-07 | 宁波市鄞州德来特技术有限公司 | Air passage structure of cylinder cover |
| CN205744119U (en) * | 2016-07-01 | 2016-11-30 | 重庆长安汽车股份有限公司 | A kind of inlet structure of direct spray petrol engine in cylinder |
| CN209212376U (en) * | 2018-10-15 | 2019-08-06 | 奇瑞汽车股份有限公司 | Supercharged direct injection engine intake duct |
| CN209195568U (en) * | 2018-12-29 | 2019-08-02 | 重庆长安汽车股份有限公司 | A kind of inlet structure, engine and automobile |
| CN209340068U (en) * | 2019-01-16 | 2019-09-03 | 江铃汽车股份有限公司 | A kind of high-performance air passage structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482813A (en) * | 2021-06-30 | 2021-10-08 | 东风汽车集团股份有限公司 | Air inlet channel, engine and vehicle |
| CN113482813B (en) * | 2021-06-30 | 2022-11-04 | 东风汽车集团股份有限公司 | Air inlet channel, engine and vehicle |
| CN113982791A (en) * | 2021-11-16 | 2022-01-28 | 蜂巢动力***(江苏)有限公司 | Engine air inlet passage structure, engine and automobile |
| CN113982791B (en) * | 2021-11-16 | 2022-08-30 | 蜂巢动力***(江苏)有限公司 | Engine air inlet passage structure, engine and automobile |
| CN114109673A (en) * | 2021-11-25 | 2022-03-01 | 哈尔滨东安汽车动力股份有限公司 | High tumble inlet structure |
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Application publication date: 20200707 |