CN102392752A - Air-path structure for small universal gasoline engines - Google Patents
Air-path structure for small universal gasoline engines Download PDFInfo
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- CN102392752A CN102392752A CN201110384729XA CN201110384729A CN102392752A CN 102392752 A CN102392752 A CN 102392752A CN 201110384729X A CN201110384729X A CN 201110384729XA CN 201110384729 A CN201110384729 A CN 201110384729A CN 102392752 A CN102392752 A CN 102392752A
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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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Abstract
The invention discloses an air-path structure for small universal gasoline engines, which is characterized in that an air inlet path is arranged in a cylinder cover, and an included angle alpha formed between the center line (projected on an XOY coordinate surface) of the air inlet path and an OX shaft is equal to minus 155-165 degrees or plus 155-165 degrees; and an included angle beta formed between the center line (projected on an XOZ coordinate surface) of an air intake valve and an OZ shaft is equal to plus 5-15 degrees. The inner wall of the air path is transited smoothly. By using the air-path structure disclosed by the invention, an air flow entering a cylinder is formed into an inclined tumble. In addition, the inner wall of the air path disclosed by the invention is transited smoothly, and no abrupt structure exists in the air path, therefore, the air path has a good circulating capacity. By using the air-path structure disclosed by the invention, the circulating capacity of the air path can be used fully, moderate eddies and tumbles can be formed in a combustion chamber, and an air mixture is mixed more uniformly, therefore, the spread of a combustion flame is facilitated, the combustion speed is higher, and the thermal efficiency and power of an engine are improved.
Description
Technical field
The present invention relates to a kind of air passage structure of motor, particularly a kind of general gasoline engines air passage structure.
Background technique
Intake duct is the throat of motor; Play a part what, direction and fuel oil mixed process that the control air-flow gets into cylinder, and the quality of the intake duct of air inlet system and exhaust system design affects power character, Economy, combustion noise and the noxious gas emission of motor to a great extent.The appropriate design of intake duct not only can be for motor provides more mixed gas, and can in cylinder, form and roll stream and eddy current, and the turbulent flow in the cylinder is strengthened, and fuel oil and air mixing are more abundant, and it is more complete sooner to burn, and sends bigger power.
At present; Also have at the intake duct design aspect air flue angle α is designed to 25 °～60 ° of angles; But the air flue angle in this angular range only is applicable to many valves petrol engine; And usually because of two intake valve symmetric arrangement make the motion of charge air flow in the cylinder cap plane cancel each other, strength of vortex is less in the petrol engine cylinder.But owing to its compact structure, each arrangement of parts of space is tight, so above-mentioned air flue angular region is inapplicable for small utility gasoline engine; Therefore; Small utility gasoline engine often adopts straight intake duct structure for obtaining full admission efficient, but this straight intake duct structure makes that the interior strength of vortex of cylinder is almost nil; Be unfavorable for improving rate of burning, and engine thermal efficiency and power are all not high.
Summary of the invention
To above-mentioned existing technology, the present invention provides a kind of small utility gasoline engine air passage structure.It can improve the eddy current of engine inlets simultaneously and roll intensity of flow, makes fuel oil and air mixing more abundant, and it is more complete sooner to burn, and simple in structure.
In order to solve the problems of the technologies described above; The technological scheme that a kind of small utility gasoline engine air passage structure of the present invention is achieved is: intake duct is arranged in the cylinder cap, the angle of the center line of said intake duct between projection on the XOY coordinate surface and OX axle=-(155 °～165 °) or angle=+ (155 °～165 °); The angle β of the center line of intake valve between projection on the XOZ coordinate surface and OZ axle=+ (5～15 °)
Small utility gasoline engine air passage structure of the present invention, wherein, the inwall transition of said air flue is smooth smooth and easy.
Compared with prior art, the invention has the beneficial effects as follows:
Air passage structure of the present invention; With the center line of intake duct the angle between projection on the XOY coordinate surface and the OX axle=-(155 °～165 °) or angle=+ (155 °～165 °) promptly and before and after the cylinder cap bottom plane angle optimal design between the symmetry plane be 15～25 °; Because this angle is too small, be difficult in cylinder, form suitable strength of vortex; But, then be difficult to arrange air flue because of outside component space is compact if this angle is excessive.The design of small utility gasoline engine Chang Weidan air flue list valve; Can not offset intake swirl because of the intake valve of conventional symmetric arrangement; Therefore; Do not need too big air flue angle can form the eddy current of certain intensity, air flue angle less in the small utility gasoline engine can form the suitably strength of vortex of size by steering flow in cylinder.The angle direction can be mated according to outside component spatial arrangement, and the angle direction can be illustrated in figure 1 as in the XOY coordinate surface, (promptly to overlook) along the rotation of OX axle clockwise direction and form, and reference character 3 shows the eddy current direction of its generation among Fig. 1; The angle direction also can be illustrated in figure 2 as in the XOY coordinate surface, (promptly to overlook) along the OX axle counterclockwise rotates formation, and reference character 3 shows the eddy current direction of its generation among Fig. 2.The angle direction should make air flue and combustion chamber of air cylinder be oriented in a tangential direction, so that air inlet tangentially gets into the firing chamber, forms eddy current.
Air passage structure of the present invention; With the center line and the OZ axle of intake valve, promptly the angle β between the cylinder centerline is designed to 5～15 °, because; Usually roll flow pattern petrol engine intake duct angle β=25～35 °; But so excessive angle β can make small utility gasoline engine gas handling system (comprising intake duct, Carburetor and empty filter) away from head side, makes the complete machine height excessive, is difficult to satisfy its terminal usage requirement.In addition, excessive angle β can reduce air inflow to a certain extent.Thereby air passage structure of the present invention takes all factors into consideration air inflow and stream is rolled in air inlet, and β is limited to 5～15 ° with angle, it has been shown among Fig. 3 has rolled flow path direction 6.
Air passage structure of the present invention makes the air-flow that gets into cylinder form inclined shaft and rolls stream under the acting in conjunction aspect above-mentioned two.In addition, air flue inwall of the present invention transition is smooth smooth and easy, does not have mutation structure in the air flue, has negotiability preferably.To sum up, air passage structure of the present invention, the negotiability of air flue can be utilized fully; Can form the eddy current of appropriateness in the firing chamber and roll stream, mixed gas mixes more even, helps the propagation of combustion flame; Velocity of combustion is faster, and engine thermal efficiency and power are improved.
Description of drawings
Fig. 1 is the plan view of a kind of intake and exhaust port sand core structure in the small utility gasoline engine air passage structure of the present invention;
Fig. 2 is the plan view of another kind of intake and exhaust port sand core structure in the small utility gasoline engine air passage structure of the present invention;
Fig. 3 is that a kind of small utility gasoline engine air passage structure of the present invention master looks sectional view.
Among the figure:
1-intake duct 2-air outlet flue 3-eddy current direction 4-cylinder head
5-valve 6-rolls flow path direction 7-cylinder cap bottom plane L1-intake duct center line
L2-air outlet flue centre line L 3-cylinder cap bottom plane centre line L 4-cylinder centerline L5-intake valve center line.
Embodiment
Below in conjunction with embodiment the present invention is done to describe in further detail.
Like Fig. 1, Fig. 2 and shown in Figure 3, a kind of small utility gasoline engine air passage structure of the present invention, intake duct 1 is arranged in the left and right sides in the cylinder cap 4 with air outlet flue 2, and intake duct centre line L 1 is as shown in the figure respectively with air outlet flue centre line L 2.Angle=155 of the centre line L 1 of said intake duct 1 between projection on the XOY coordinate surface and OX axle °～165 °, promptly the centre line L 1 of intake duct 1 is rotated counterclockwise formation around the OX axle; Have above-mentioned angle and can in cylinder, form the eddy current of certain intensity, eddy current direction 3 as shown in Figure 1; The angle of the centre line L 5 of the intake valve 5 among the present invention between projection on the XOZ coordinate surface and OZ axle, i.e. the centre line L 5 of intake valve 5 and angle β=5～15 between the cylinder centerline L4 ° can form the flow path direction 6 that rolls as shown in Figure 2.Under the acting in conjunction aspect two, the air-flow that gets into cylinder forms inclined shaft and rolls stream, thereby makes that fuel oil and air mixing are more abundant, accelerates velocity of propagation of flame, makes burning more complete, thermal efficiency lifting.
The direction of angle needs to mate according to combustion-chamber shape and outside component spatial arrangement in the air passage structure of the present invention; The direction of this angle also can be as shown in Figure 2, promptly the centre line L 1 of intake duct 1 around the OX axle turn clockwise the span that forms this angle be α=-(155 °～165 °); If angle adopts clockwise direction, then need consider that to the layout of component such as empty filter, fuel tank and the design again of cylinder head radiating fin, its concrete design belongs to technological means habitual in the present technique field, repeats no more at this.In addition, the inwall transition of said intake duct 1 is smooth smooth and easy, does not have mutation structure, is to have negotiability preferably in the air flue.
Through using commercial three-dimensional simulation software AVL-Fire to calculate checking; The suction tude of air passage structure of the present invention and petrol engine, Carburetor, empty filter and silencing apparatus are complementary; Make maximum tubulence energy lifting 14.3% in the compression process cylinder, engine combustion speed increases, and the thermal efficiency has improved more than 5%.
Although invention has been described for top combination figure; But the present invention is not limited to above-mentioned embodiment, and above-mentioned embodiment only is schematically, rather than restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Under the situation that does not break away from aim of the present invention, can also make a lot of distortion, these all belong within the protection of the present invention.
Claims (2)
1. small utility gasoline engine air passage structure; Intake duct (1) is arranged in the cylinder cap (4), it is characterized in that: the angle of the center line (L1) of said intake duct (1) between projection on the XOY coordinate surface and OX axle=-(155 °～165 °) or angle=+ (155 °～165 °); The angle β of the center line (L5) of intake valve (5) between projection on the XOZ coordinate surface and OZ axle=+ (5～15 °).
2. small utility gasoline engine air passage structure according to claim 1 is characterized in that: the inwall transition of said intake duct (1) is smooth smooth and easy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110384729XA CN102392752A (en) | 2011-11-28 | 2011-11-28 | Air-path structure for small universal gasoline engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110384729XA CN102392752A (en) | 2011-11-28 | 2011-11-28 | Air-path structure for small universal gasoline engines |
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| CN102392752A true CN102392752A (en) | 2012-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110384729XA Pending CN102392752A (en) | 2011-11-28 | 2011-11-28 | Air-path structure for small universal gasoline engines |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102641996A (en) * | 2012-04-16 | 2012-08-22 | 芜湖永裕汽车工业有限公司 | Sand core structure for air flue of cylinder cover of engine |
| CN108021092A (en) * | 2017-11-27 | 2018-05-11 | 天津大学 | A kind of turbulence form control method for fast press |
| CN117552883A (en) * | 2024-01-12 | 2024-02-13 | 潍柴动力股份有限公司 | Engine cylinder cover and engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085982A (en) * | 1993-07-24 | 1994-04-27 | 天津大学 | Low blowdown high-performance petrol engine novel jet flow combustion system and combustion method thereof |
| CN1291257A (en) * | 1998-02-20 | 2001-04-11 | 斯蒂芬·罗纳德·蒂克纳 | IC engine |
| CN101660471B (en) * | 2009-09-24 | 2011-08-10 | 重庆长安汽车股份有限公司 | Petrol engine air inlet path |
| CN202360235U (en) * | 2011-11-28 | 2012-08-01 | 天津内燃机研究所 | Intake port structure of small general gasoline engine |
-
2011
- 2011-11-28 CN CN201110384729XA patent/CN102392752A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085982A (en) * | 1993-07-24 | 1994-04-27 | 天津大学 | Low blowdown high-performance petrol engine novel jet flow combustion system and combustion method thereof |
| CN1291257A (en) * | 1998-02-20 | 2001-04-11 | 斯蒂芬·罗纳德·蒂克纳 | IC engine |
| CN101660471B (en) * | 2009-09-24 | 2011-08-10 | 重庆长安汽车股份有限公司 | Petrol engine air inlet path |
| CN202360235U (en) * | 2011-11-28 | 2012-08-01 | 天津内燃机研究所 | Intake port structure of small general gasoline engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102641996A (en) * | 2012-04-16 | 2012-08-22 | 芜湖永裕汽车工业有限公司 | Sand core structure for air flue of cylinder cover of engine |
| CN108021092A (en) * | 2017-11-27 | 2018-05-11 | 天津大学 | A kind of turbulence form control method for fast press |
| CN117552883A (en) * | 2024-01-12 | 2024-02-13 | 潍柴动力股份有限公司 | Engine cylinder cover and engine |
| CN117552883B (en) * | 2024-01-12 | 2024-05-17 | 潍柴动力股份有限公司 | Engine cylinder cover and engine |
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Application publication date: 20120328 |