CN110296019B - Internal combustion engine with novel air inlet channel - Google Patents

Internal combustion engine with novel air inlet channel Download PDF

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Publication number
CN110296019B
CN110296019B CN201910631299.3A CN201910631299A CN110296019B CN 110296019 B CN110296019 B CN 110296019B CN 201910631299 A CN201910631299 A CN 201910631299A CN 110296019 B CN110296019 B CN 110296019B
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CN
China
Prior art keywords
combustion chamber
side profile
section
lower side
air inlet
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CN201910631299.3A
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Chinese (zh)
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CN110296019A (en
Inventor
杜小平
胡会泳
林健明
高宏亮
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Jiangmen Dachangjiang Group Co Ltd
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Jiangmen Dachangjiang Group Co Ltd
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Priority to CN201910631299.3A priority Critical patent/CN110296019B/en
Publication of CN110296019A publication Critical patent/CN110296019A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B31/00Modifying induction systems for imparting a rotation to the charge in the cylinder
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00Cylinders; Cylinder heads 
    • F02F1/24Cylinder heads
    • F02F1/42Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4235Shape or arrangement of intake or exhaust channels in cylinder heads of intake channels
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

The invention discloses an internal combustion engine with a novel air inlet channel, which comprises a combustion chamber formed by a cylinder head, a cylinder body and a piston combination, wherein the cylinder head is provided with the air inlet channel and the air outlet channel which extend laterally and are communicated to the combustion chamber, an inlet valve and an exhaust valve which have an included angle alpha with the central axis of the cylinder body are correspondingly arranged at the joint, the inlet and the exhaust valves are controlled to open and close to realize the inlet of combustible mixed gas and the exhaust gas discharge, the air inlet channel forms an upper side profile and a lower side profile on the vertical cross section of the internal combustion engine, the middle section of the lower side profile is a straight section, an included angle beta is formed between the middle section of the lower side profile and the lower end surface of an umbrella-shaped sealing part of the exhaust valve,The combustion chamber can form severe tumble, has larger area with large turbulent energy reaction, increases the combustion speed, improves the combustion stability, can improve the lean-burn capability on the premise of ensuring stable combustion, can improve the energy conservation and consumption reduction of the engine and the tail gas purification, and simultaneously improves the power performance of the engine and the sound quality.

Description

Internal combustion engine with novel air inlet channel
Technical Field
The invention relates to an internal combustion engine, in particular to an internal combustion engine with a novel air inlet channel.
Background
Referring to fig. 1 and 2, a conventional internal combustion engine structure for a motorcycle includes a combustion chamber 3 formed by combining a cylinder head 1, a cylinder body 2 and a piston 10, wherein the cylinder head 1 is provided with an air inlet channel 4', an air inlet valve 6 is arranged at the joint with the combustion chamber 3, and the opening and closing of the air inlet valve 6 are controlled to realize the entry of combustible mixture in the combustion chamber 3.
In order to achieve higher charging efficiency, ensure that a larger amount of combustible mixture can quickly enter the combustion chamber 3, the air inlet channel 4' is usually designed to have no meandering streamline arc so as to reduce the blocking effect of the pipe wall on the combustible mixture; simultaneously, the inlet valve 6 at the intersection of the inlet channel 4 'and the combustion chamber 3 is plugged, the umbrella-shaped sealing part of the inlet valve 6 is approximately coaxially arranged relative to the intersection formed by the inlet channel 4', and when the inlet valve 6 is opened, the combustible mixture enters the combustion chamber along the periphery of the umbrella-shaped sealing part with relatively small resistance.
The traditional streamline arc-shaped air inlet channel structure can ensure that a large amount of combustible mixed gas enters the combustion chamber, has higher charging efficiency, but the combustible mixed gas is difficult to form severe tumble after entering the combustion chamber 3, so that when the combustible mixed gas in the combustion chamber 3 is combusted, the reaction area with larger turbulent energy is smaller, and the combustible mixed gas cannot be combusted sufficiently and quickly, thereby being unfavorable for the fuel consumption, the emission and the power performance of the engine.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an internal combustion engine with sufficient combustion.
The technical scheme adopted for solving the technical problems is as follows:
The utility model provides an internal-combustion engine with novel intake duct, includes the combustion chamber that constitutes by cylinder end, cylinder body and piston combination, the cylinder end is equipped with by the side direction extension and communicates to the intake duct and the exhaust duct of combustion chamber, intake duct and combustion chamber's handing-over department corresponds and is equipped with and has intake valve and the exhaust valve that contained angle is alpha with the cylinder body axis, through control opening and closing of intake valve and exhaust valve, realizes the entering and the exhaust gas discharge of combustible mixture in the combustion chamber, the intake duct forms upside profile and downside profile on the vertical cross section of internal-combustion engine, downside profile middle section is flat straight section, and forms contained angle beta with the umbrella form seal lower terminal surface of exhaust valve, and
The straight section of the lower side contour line is a straight line or an arc line of a straight section with a obviously smaller radian Yu Feiping.
The beneficial effects of the invention are as follows: the straight section is arranged on the air inlet channel to guide the combustible mixed gas to enter the combustion chamber, so that severe tumble can be formed in the combustion chamber, the large turbulence energy area in the combustion chamber is obviously increased at the combustion moment of the combustible mixed gas, the combustion rate is increased, the combustion stability is improved, the lean-burn capability can be improved on the premise of ensuring stable combustion, the energy conservation, consumption reduction and tail gas purification of an engine can be improved, the power performance of the engine is improved, and the sound quality is improved.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a prior art internal combustion engine having a conventional intake port;
FIG. 2 is a schematic diagram of the structure of FIG. 1;
FIG. 3 is a schematic diagram of the structure of the present invention;
FIG. 4 is a flow chart of an intake passage of the present invention versus a conventional internal combustion engine;
FIG. 5 is another simplified structural diagram of the present invention;
FIG. 6 is a flow field comparison of the present invention with a prior art conventional internal combustion engine during compression in a combustion chamber;
fig. 7 is a graph of the turbulence energy profile of the ignition timing in the combustion chamber of the present invention and a conventional internal combustion engine.
Detailed Description
Referring to fig. 3, a schematic diagram of an internal combustion engine with a novel air inlet channel is provided, which comprises a combustion chamber 3 composed of a cylinder head 1, a cylinder body 2 and a piston 10 capable of moving up and down, wherein the cylinder head 1 is provided with an air inlet channel 4 and an air outlet channel 5 which extend laterally and are communicated to the combustion chamber 3, and the joint of the air inlet channel 4, the combustion chamber 3, the air outlet channel 5 and the combustion chamber 3 is correspondingly provided with an air inlet valve 6 and an air outlet valve 7 which have an included angle alpha with the central axis of the cylinder body 2.
In addition, the junction is also provided with a sealing valve seat 9, an umbrella-shaped sealing part at the head end of the air inlet valve and the head end of the air outlet valve are propped against the sealing valve seat 9 under the control of a transmission mechanism to realize sealing, and the opening or closing of the air inlet valve 6 and the air outlet valve 7 is controlled to realize the inlet of combustible mixed gas in the combustion chamber 3 and the exhaust gas discharge. The present invention has been made in an intensive study on the arrangement of the intake duct 4 of the internal combustion engine in order to enable the formation of a severe tumble flow after the combustible mixture enters the combustion chamber 3.
Specifically, the intake duct 4 is formed with an upper side contour line 41 and a lower side contour line 42 in a vertical cross section of the internal combustion engine, wherein the lower side contour line 42 has a straight section. The straight section is obliquely arranged from top to bottom along the air inlet channel 4 and faces the right side outline of the air inlet valve 6, so that the combustible mixed gas is enabled to flow in from the right side of the air inlet valve 6 more under the drainage effect of the straight section of the lower side outline line 42, and the combustible mixed gas is directly rushed to the bottom of the combustion chamber 3 from the right side inertia, so that more severe tumble can be formed. And the straight section of the lower profile line 42 is located at the middle section, so that the structural form of the beginning end and the terminal end of the air inlet channel 6 can not be changed, and the arrangement of other parts or air inlet connecting pipelines is not required to be changed.
As shown in fig. 4, the flow direction of the combustible mixture flowing into the combustion chamber 3 is compared with the flow direction of the conventional air inlet structure. It can be seen that an internal combustion engine having a conventional intake port structure has a substantially equivalent proportion of combustible mixture that is flushed from left and right sides of an intake valve in an intake valve open state; in the present invention, the right side of the intake valve 6 is opened, and the inflow of the combustible mixture is significantly larger than the left side.
The straight section of the middle section of the lower profile line 42 is not limited to be a straight line, but also can be an arc line of a straight section with a obviously smaller radian Yu Feiping, so that the purpose of leading more combustible mixture to flow in from the right side of the intake valve 6 can be achieved.
In the process, the inventor obtains the better design parameter data of the straight section through repeated simulation, test and improvement, and can obviously improve the combustion efficiency. Namely, the straight section of the middle section of the lower side profile line 42 forms an included angle beta with the lower end face of the umbrella-shaped sealing part 71 of the exhaust valve 7, and Within this range, the ratio of the right-hand inflow amount to the left-hand inflow amount of the combustible mixture at the intake valve 6 can be made larger.
Referring to fig. 5 and 6, fig. 5 is a schematic diagram in a top view, on which two cross sections S 1 and S 2 are formed. Fig. 6 is a flow field comparison diagram of the combustible mixture of the present invention on the section S 1、S2 during compression with a conventional port internal combustion engine.
As can be seen from fig. 6, the tumble flow (for easy identification, the larger mixing center point is denoted by the number Q) in the combustion chamber 3 of the present invention is stronger and the range is wider. The turbulent flow intensity during the compression stroke can be increased by the generation of the tumble, so that the flame front is wrinkled, the area of the flame front is increased, the heat transfer between the burnt gas and the unburnt gas is accelerated, and the combustion rate is improved.
FIG. 7 is a graph showing the turbulence energy distribution diagram of the ignition time in the combustion chamber of the conventional internal combustion engine, wherein the central part of the graph shows the area with larger turbulence energy reaction, and the area with larger turbulence energy reaction is wider.
The novel air inlet channel 4 is adopted, and the straight section is arranged in the middle section of the lower side contour line 42 to guide the combustible mixed gas into the combustion chamber 3, so that severe tumble can be formed in the combustion chamber 3, the large turbulence energy area in the combustion chamber 3 is obviously increased at the combustion moment of the combustible mixed gas, the combustion rate is increased, the combustion stability is improved, the lean-burn capability can be improved on the premise of ensuring stable combustion, the energy saving and consumption reduction of an engine and the tail gas purification can be improved, the power performance of the engine is improved, and the sound quality is improved.

Claims (2)

1. The utility model provides an internal-combustion engine with novel intake duct, includes combustion chamber (3) that constitute by cylinder head (1), cylinder body (2) and piston (10) combination, cylinder head (1) are equipped with intake duct (4) and exhaust duct (5) by the side direction extension and communicate to combustion chamber (3), intake duct (4) correspond with combustion chamber (3), the department of handing-over of exhaust duct (5) and combustion chamber (3) is equipped with intake valve (6) and exhaust valve (7) that have contained angle alpha with cylinder body (2) axis, above-mentioned department of handing-over still is equipped with sealed disk seat (9), and the umbrella sealing portion of intake valve head end, exhaust valve head end supports under drive mechanism's control and presses and realize sealedly on sealed disk seat (9), through control opening and closing of intake valve (6) and exhaust valve (7), realizes entering and exhaust gas discharge of combustible mixture in combustion chamber (3), its characterized in that: the air inlet channel (4) forms an upper side profile (41) and a lower side profile (42) on the vertical cross section of the internal combustion engine, the middle section of the lower side profile (42) is a straight section, the front section and the rear section of the lower side profile (42) are curved sections without bending streamline, the front section and the rear end are smoothly connected with the middle section, an included angle beta is formed between the middle section of the lower side profile (42) and the lower end face of an umbrella-shaped sealing part (71) of the exhaust valve (7), beta is less than or equal to 1/4 alpha, and in the range, the ratio of the right side inflow amount to the left side inflow amount of the combustible mixture at the intake valve (6) can be larger.
2. An internal combustion engine according to claim 1, wherein: the straight section of the lower side profile line (42) is a straight line or an arc line of a straight section with a radian obviously smaller than Yu Feiping.
CN201910631299.3A 2019-07-12 2019-07-12 Internal combustion engine with novel air inlet channel Active CN110296019B (en)

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Application Number Priority Date Filing Date Title
CN201910631299.3A CN110296019B (en) 2019-07-12 2019-07-12 Internal combustion engine with novel air inlet channel

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CN110296019B true CN110296019B (en) 2024-05-31

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07317546A (en) * 1994-05-25 1995-12-05 Daihatsu Motor Co Ltd Suction device of internal combustion engine
CN201347809Y (en) * 2009-01-09 2009-11-18 重庆宗申发动机制造有限公司 Engine cylinder end
CN101649789A (en) * 2008-08-14 2010-02-17 力帆实业(集团)股份有限公司 Cylinder head of internal combustion engine
CN102518527A (en) * 2011-12-01 2012-06-27 隆鑫通用动力股份有限公司 Mini-universal petrol engine cylinder head and petrol engine thereof
CN108869006A (en) * 2018-06-20 2018-11-23 奇瑞汽车股份有限公司 Small-displacement gasoline engine combustion system
CN210264940U (en) * 2019-07-12 2020-04-07 江门市大长江集团有限公司 Internal combustion engine with novel air inlet channel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4964815B2 (en) * 2008-03-28 2012-07-04 本田技研工業株式会社 Intake air amount control device for V-type internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07317546A (en) * 1994-05-25 1995-12-05 Daihatsu Motor Co Ltd Suction device of internal combustion engine
CN101649789A (en) * 2008-08-14 2010-02-17 力帆实业(集团)股份有限公司 Cylinder head of internal combustion engine
CN201347809Y (en) * 2009-01-09 2009-11-18 重庆宗申发动机制造有限公司 Engine cylinder end
CN102518527A (en) * 2011-12-01 2012-06-27 隆鑫通用动力股份有限公司 Mini-universal petrol engine cylinder head and petrol engine thereof
CN108869006A (en) * 2018-06-20 2018-11-23 奇瑞汽车股份有限公司 Small-displacement gasoline engine combustion system
CN210264940U (en) * 2019-07-12 2020-04-07 江门市大长江集团有限公司 Internal combustion engine with novel air inlet channel

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