CN202954893U - Cylinder cover for general high-power small-size gasoline engine - Google Patents
Cylinder cover for general high-power small-size gasoline engine Download PDFInfo
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- CN202954893U CN202954893U CN 201220640949 CN201220640949U CN202954893U CN 202954893 U CN202954893 U CN 202954893U CN 201220640949 CN201220640949 CN 201220640949 CN 201220640949 U CN201220640949 U CN 201220640949U CN 202954893 U CN202954893 U CN 202954893U
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- cylinder head
- air
- cylinder cover
- air inlet
- air outlet
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Abstract
The utility model discloses a cylinder cover for a general high-power small-size gasoline engine. The cylinder cover comprises a cylinder cover entity body, wherein an air inlet channel and an air exhaust channel are formed in the cylinder cover entity body; the air inlet channel enters the cylinder cover entity body in a manner of gradual contraction and penetrates through the bottom of the cylinder cover entity body after turning; an air inlet valve seat is arranged at an outlet of the air inlet channel; an air inlet throat is positioned at the air inlet valve seat; the air exhaust channel enters the cylinder cover entity body from the bottom of the cylinder cover entity body and penetrates through the surface of the cylinder cover entity body in a manner of gradual stretching after turning; an air exhaust valve seat is arranged at an inlet of the air exhaust channel; an air exhaust throat is positioned at the air exhaust valve seat; the air inlet channel at the air inlet throat is cylindrical; the axis of the cylinder is perpendicular to the bottom of the cylinder cover entity body; the air exhaust channel at the air exhaust throat is also cylindrical; and the axis of the cylinder is perpendicular to the bottom of the cylinder cover entity body. Compared with the conventional pressure cast cylinder cover, the cylinder cover has the advantages that the minimum sectional areas of the air inlet channel and the air exhaust channel are greatly enlarged, so that the air inlet amount of the gasoline engine is increased, and air can be clearly exhausted.
Description
Technical field
The utility model belongs to general small-size gasoline engine and manufactures field, relates in particular to a kind of general small-size gasoline engine high power cylinder head.
Background technique
Since 21 century, China's internal-combustion engine industry is developed rapidly, and through product restructuring and operating mechanism conversion in recent years, manufacturing enterprise has progressively adapted to the requirement of market development.Wherein the general small-size gasoline engine product is the fastest product of growth rate over nearly 10 years.After China joined WTO, China has become the production base of world's general small-size gasoline engine, and Annual output, from 550,000 2,200 ten thousand of developing into 2011 of calendar year 2001, accounts for 40% of the world.Be only second at present the U.S., rank the whole world the second, the technical merit of product is also significantly promoting simultaneously.The purposes of general small-size gasoline engine is very extensive, nineteen nineties domestic general small-size gasoline engine at home product sold mainly as the power of equipment for plant protection.March toward 21st century so far, because Domestic made Small petrol engine export volume strengthens, according to external client's needs, products export be take generator set and graden machine as main, accounts for more than 80% of gross production.From the outfitting tool of general small-size gasoline engine, can be used for water pump, generator set, mist duster, atomizing sprayer, spray thrower, chain saw, delimber, GREEB HEDGE MACHINE, mowing machine, brush cutter, Pneumatic extinguisher, rammer compacter, forcible entry tool, shear, beach buggy, golf cart, sledge, outboard machine, scooter, model plane, ship mould etc. relate to industry, agricultural, Guan Baoye, show business, transportation, rescue and relief work, graden machine etc. a plurality of with economic development and the people closely-related field of living.
The performance of general small-size gasoline engine largely relies on its gas exchange process.The flow field state formed in cylinder in the inlet and outlet process directly affects the air inflow of motor, the concentration of air-fuel mixture, the velocity of propagation of combustion process Flame, the stability of burning and the completeness of burning, and then affects performance and the emission level of motor.The flow characteristic of gas in the inlet and outlet road determining the air motion situation in cylinder, the mixing of fuel, the situations such as discharge that circulation finishes waste gas to a great extent.For power character, Economy and the exhaust index that improves motor, the measure that needs research to reduce the intake and exhaust fluid resistance losses, improve volumetric efficiency and reduction coefficient of residual gas.The main cause that affects the intake and exhaust ability is flow resistance.Character according to the air inlet system and exhaust system flow resistance can be divided into two classes to resistance, and a class is on-way resistance, i.e. tube friction, and it is relevant with the change in shape of flow velocity, pipe range, flow duct, tube wall surface quality etc.; Another kind of is local resistance, and it is the main loss in flowing, and mainly occurs in air-strainer, runner turning and inlet valve seat ring place.In the general small-size gasoline engine air inlet is flowed, due to the pipeline tubbiness of air inlet, the wall smoother, its on-way resistance is also little.Thereby local resistance loss is the main loss in flow process, it is formed by stacking by a series of local resistance, especially at air-strainer, runner turning and inlet valve seat ring place, therefore reduce the local resistance loss at these positions, to reducing the flow resistance of gas handling system, improving volumetric efficiency has significant effect.
What the general small-size gasoline engine discharge capacity was greater than 100mL mostly is the four-stroke structure, the structural relation of intake and exhaust flow resistance and air flue is very large, the four-stroke cylinder head mostly is the pack alloy manufacture, the restriction that the die-casting cylinder cap air flue is manufactured by extrusion process and mould, the intake and exhaust port resistance of small-sized petrol engine cylinder cover is larger at present, affects petrol engine power and improves, and therefore needs research internal combustion engine air-exhausting air-entering flow characteristic to improve negotiability, reduce flow resistance, realize the high-power output of petrol engine.
Summary of the invention
The purpose of this utility model is to provide a kind of general small-size gasoline engine high power cylinder head.
For achieving the above object, the utility model adopts following technological scheme: a kind of general small-size gasoline engine high power cylinder head, comprise the cylinder head entity, intake duct and air outlet flue are arranged on the cylinder head entity, intake duct is tapered and enters in the cylinder head entity, pass cylinder head entity bottom surface after turning, there is suction valve cone in outlet port at intake duct, the air inlet aditus laryngis is positioned at the suction valve cone place, air outlet flue enters in the cylinder head entity from cylinder head entity bottom surface, be gradually expanding shape after turning and pass the cylinder head solid object surface, there is exhaust valve seat in inlet at air outlet flue, the exhaust aditus laryngis is positioned at the exhaust valve seat place, the intake duct at air inlet aditus laryngis place is cylindrical, the shaft axis of this cylinder is vertical with the bottom surface of cylinder head entity, the air outlet flue at exhaust aditus laryngis place is also cylindrical, the shaft axis of this cylinder is vertical with the bottom surface of cylinder head entity.
The area of the minimum flow area of intake duct is 73% ~ 81 % of Fighter Inlet place sectional area, and air inlet aditus laryngis place sectional area is 82% ~ 95% of Fighter Inlet place sectional area; The area of the minimum flow area of air outlet flue is 73% ~ 81% of air outlet flue outlet port sectional area, and exhaust aditus laryngis place sectional area is 82% ~ 95% of air outlet flue outlet port sectional area.
The shaft axis of tapered intake duct and the shaft axis of cylindrical air inlet intersect; The shaft axis in the shaft axis of gradually expanding shape air outlet flue and cylindrical air exhaust road intersects.
Adopt the general small-size gasoline engine high power cylinder head of technique scheme, with original die casting mould cylinder head, compare, intake duct, air outlet flue minimum sectional area have a larger increase, through the air flue test stand current stabilization, test, the negotiability of intake duct, air outlet flue has improved 12～17%, can make the petrol engine air admission amount increase, exhaust is more clean.Use the utility model to improve more than 10% through the debugging engine power, petrol engine specific fuel consumption, discharge all make moderate progress.
The accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Fig. 2 is existing 188F general small-size gasoline engine air cylinder head structure schematic diagram.
Fig. 3 is the contrast schematic diagram that the sectional area of intake duct in the sectional area of intake duct in Fig. 1 and Fig. 2 changes with coordinate axes.
Fig. 4 is the contrast schematic diagram that the sectional area of air outlet flue in the sectional area of air outlet flue in Fig. 1 and Fig. 2 changes with coordinate axes.
In figure, 1, intake duct, 2, suction valve cone, 3, the cylinder head entity, 4, exhaust valve seat, 5, air outlet flue, 6, Fighter Inlet, 7, the minimum flow area of intake duct, 8, air inlet aditus laryngis, 9, the minimum flow area of air outlet flue, 10, the air outlet flue outlet, 11, the exhaust aditus laryngis.
Embodiment
General small-size gasoline engine high power cylinder head as shown in Figure 1, comprise cylinder head entity 3, intake duct 1 and air outlet flue 5 are arranged on cylinder head entity 3, intake duct 1 is tapered and enters in cylinder head entity 3, turn under backward and pass cylinder head entity bottom surface, in the outlet port of intake duct, suction valve cone 2 is arranged, air inlet aditus laryngis 8 is positioned at the suction valve cone place, the intake duct at air inlet aditus laryngis place is cylindrical, the shaft axis of this cylinder is vertical with the bottom surface of cylinder head entity, and the shaft axis of tapered intake duct and the shaft axis of cylindrical air inlet intersect; Air outlet flue 5 upwards enters in cylinder head entity 3 from cylinder head entity 3 bottom surfaces, be gradually expanding shape after turning and pass cylinder head entity 3 surfaces, there is exhaust valve seat 4 in inlet at air outlet flue, exhaust aditus laryngis 11 is positioned at the exhaust valve seat place, the air outlet flue at exhaust aditus laryngis place is also cylindrical, the shaft axis of this cylinder is vertical with the bottom surface of cylinder head entity, and the shaft axis in the shaft axis of gradually expanding shape air outlet flue and cylindrical air exhaust road intersects.
The area of the minimum flow area 7 of intake duct is 73% ~ 81 % of Fighter Inlet 6 place's sectional areas, and air inlet aditus laryngis 8 place's sectional areas are 82% ~ 95% of Fighter Inlet 6 place's sectional areas; The area of the minimum flow area 9 of air outlet flue be air outlet flue export 10 place's sectional areas 73% ~ 81%, exhaust aditus laryngis 11 place's sectional areas be air outlet flue export 10 place's sectional areas 82% ~ 95%.
The 188F cylinder cover of petrol engine of take is described as follows as example: intake duct 1 is gradual shrinkage, the circle that its cross section is diameter 33mm, cross section becomes 31mm along shaft axis from inlet to the diameter of section before of turning, reduce gradually to be conducive to withdrawing pattern, suction valve cone 2 place's throat diameters are 30mm, it from the cylinder head bottom surface to valve guide hole, is the 30mm cylindrical body of processing, the intake duct of the cylindrical body degree of depth and the convergent of processing is crossing, and that the turning flow area is to the maximum is suitable, the minimum flow area 7 of intake duct reaches 76.5% with the Area Ratio in import cross section 6 as calculated, intake duct aditus laryngis cross section 8 is 82.6% with the Area Ratio in import cross section 6.The exhaust throat diameter is 26mm, it from the cylinder head bottom surface to valve guide hole, is the 26mm cylindrical body of processing, from turning to the air outlet flue outlet port, it is the flaring type, it is that 26.5mm is the circle of diameter 28mm to outlet port that turning starts diameter, its sectional area increases to outlet port gradually along shaft axis, the same with intake duct, the controlled working degree of depth makes sectional area change as far as possible all even maximums, the minimum flow area 9 of air outlet flue reaches 75.2% with the Area Ratio of air outlet flue outlet 10 as calculated, and the Area Ratio that exhaust aditus laryngis 11 cross sections and air outlet flue export 10 cross sections is 86.2%.The intake and exhaust port cross section changes and sees Fig. 3, Fig. 4 along the air flue shaft axis.
From Fig. 3, Fig. 4, can find out, the utility model cylinder head is compared with former die casting mould cylinder head, and the intake and exhaust port minimum sectional area has a larger increase, through the air flue test stand current stabilization, test, the negotiability of intake and exhaust port has improved 12～17%, can make the petrol engine air admission amount increase, and exhaust is more clean.Use the cylinder head of this model utility to improve more than 10% through the debugging engine power, petrol engine specific fuel consumption, discharge all make moderate progress.
The general small-size gasoline engine air inlet rotatablely moves to help mixed gas to form without producing in cylinder, and the shape in inlet and outlet road is designed to target to reach peak rate of flow.The entrance section that for this reason enters cylinder head is long-pending than large 20% left and right, valve aditus laryngis cross section.By entrance section, risen, the intake duct cross section should reduce gradually, and to guarantee that air-flow constantly accelerates to the valve direction, but the unexpected variation of airway cross-section is harmful to.To pass through machining by air flue to the transition portion between valve seat, can suitably shrink near the air flue before valve seat.Simultaneously in order to guarantee that the valve guide bushing built-in length enough leads and sealing, generally having step gives prominence to affect airway cross-section in air flue, the air flue of sand casting process (as the vehicular engine air flue) can the corresponding part of removing guarantee that circulation area is compensated in a side of cylinder cap entity when running into the airway cross-section sudden change, to reduce the sudden change of airway cross-section, and the general small-size gasoline engine air flue is owing to being die cast, limited by process engineering, position in the abrupt change of cross-section can't compensate as the air flue of sand casting process, thereby caused the reduction of air flue trafficability performance, as the machining moulding after the part vertical with the cylinder head bottom surface is casting of 188F cylinder cover of petrol engine intake and exhaust port, and be processed as cone with forming cutter, as shown in Figure 2, that with air filter, be connected and the one section air flue cylinder head inclined bottom surface are unprocessed, calculate air flue circulation changes of section by pattern size and dissection in kind and see Fig. 3, Fig. 4, air outlet flue smallest cross-sectional and exhaust outlet section ratio only 64% is described, intake duct smallest cross-sectional and import section ratio only 68%, at turning, flow area is little, add that the turning streamline changes, the actual circulation ability descends more, to cause one of reason that petrol engine power can not increase.Therefore to the intake and exhaust port of die-casting cylinder cap, need well-designed, withdrawing pattern is met under the technological requirement condition when casting mould is made and meet the requirement of internal-combustion engine mobile performance, through verification experimental verification, require the minimum actual internal area of intake and exhaust port and import section ratio will be not less than 75%, air flue aditus laryngis sectional area and import section ratio will be not less than 80%, the utility model is optimized design to air flue by this principle, sectional area and valve aditus laryngis to air flue, the coupling design has been carried out in the import cross section, and the cross section that has guaranteed air flue does not suddenly change, thereby improved the trafficability performance of air flue, the petrol engine stand test shows the power character of general small-size gasoline engine, Economy and emission performance are improved.
Claims (3)
1. a general small-size gasoline engine high power cylinder head, comprise the cylinder head entity, intake duct and air outlet flue are arranged on the cylinder head entity, intake duct is tapered and enters in the cylinder head entity, pass cylinder head entity bottom surface after turning, there is suction valve cone in outlet port at intake duct, the air inlet aditus laryngis is positioned at the suction valve cone place, air outlet flue enters in the cylinder head entity from cylinder head entity bottom surface, be gradually expanding shape after turning and pass the cylinder head solid object surface, there is exhaust valve seat in inlet at air outlet flue, the exhaust aditus laryngis is positioned at the exhaust valve seat place, it is characterized in that: the intake duct at air inlet aditus laryngis place is cylindrical, the shaft axis of this cylinder is vertical with the bottom surface of cylinder head entity, the air outlet flue at exhaust aditus laryngis place is also cylindrical, the shaft axis of this cylinder is vertical with the bottom surface of cylinder head entity.
2. general small-size gasoline engine high power cylinder head as claimed in claim 1, it is characterized in that: the area of the minimum flow area of intake duct is 73% ~ 81 % of Fighter Inlet place sectional area, and air inlet aditus laryngis place sectional area is 82% ~ 95% of Fighter Inlet place sectional area; The area of the minimum flow area of air outlet flue is 73% ~ 81% of air outlet flue outlet port sectional area, and exhaust aditus laryngis place sectional area is 82% ~ 95% of air outlet flue outlet port sectional area.
3. general small-size gasoline engine high power cylinder head as claimed in claim 1 is characterized in that: the shaft axis of tapered intake duct and the shaft axis of cylindrical air inlet intersect; The shaft axis in the shaft axis of gradually expanding shape air outlet flue and cylindrical air exhaust road intersects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220640949 CN202954893U (en) | 2012-11-29 | 2012-11-29 | Cylinder cover for general high-power small-size gasoline engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220640949 CN202954893U (en) | 2012-11-29 | 2012-11-29 | Cylinder cover for general high-power small-size gasoline engine |
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| Publication Number | Publication Date |
|---|---|
| CN202954893U true CN202954893U (en) | 2013-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220640949 Expired - Fee Related CN202954893U (en) | 2012-11-29 | 2012-11-29 | Cylinder cover for general high-power small-size gasoline engine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943716A (en) * | 2012-11-29 | 2013-02-27 | 河南创世电机科技有限公司 | High-power cylinder cover for universal small gasoline engine |
| CN105569868A (en) * | 2015-12-14 | 2016-05-11 | 中国北方发动机研究所(天津) | Novel efficient air inlet system |
| CN115324764A (en) * | 2022-10-14 | 2022-11-11 | 潍柴动力股份有限公司 | Air inlet channel structure of cylinder cover and gas engine |
| CN117685126A (en) * | 2024-02-04 | 2024-03-12 | 潍柴动力股份有限公司 | Engine cylinder cover and engine |
| CN117685126B (en) * | 2024-02-04 | 2024-05-17 | 潍柴动力股份有限公司 | Engine cylinder cover and engine |
-
2012
- 2012-11-29 CN CN 201220640949 patent/CN202954893U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943716A (en) * | 2012-11-29 | 2013-02-27 | 河南创世电机科技有限公司 | High-power cylinder cover for universal small gasoline engine |
| CN105569868A (en) * | 2015-12-14 | 2016-05-11 | 中国北方发动机研究所(天津) | Novel efficient air inlet system |
| CN115324764A (en) * | 2022-10-14 | 2022-11-11 | 潍柴动力股份有限公司 | Air inlet channel structure of cylinder cover and gas engine |
| CN117685126A (en) * | 2024-02-04 | 2024-03-12 | 潍柴动力股份有限公司 | Engine cylinder cover and engine |
| CN117685126B (en) * | 2024-02-04 | 2024-05-17 | 潍柴动力股份有限公司 | Engine cylinder cover and engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130529 Termination date: 20151129 |