CN1174931A - Bypass intake system for crankcase supercharging - Google Patents

Abstract

A bypass air intake system with boosted crankcase features that the crankcase is used to guide the air flow, and the bypass air channel, control valve and non-return valve are used to control the turbulent flow of air intake to obtain the effect of quickly burning thin oil.

Description

The by-pass gas inlet system of boosting of crankcase

The present invention is relevant a kind of gas handling system that is applied to four-journey engine, be meant a kind of especially by boosting of crankcase guiding gas handling system, and the device of cooperation bypass air flue and control valve, make engine when middle-low load, can obtain thin oil rapid combustion, can increase admission space efficient again during high load, to promote the gas handling system of engine performance.

Present being seen engine is of a great variety, promptly has two-stroke engine and four-journey engine not substantially.General four-journey engine is when middle-low load, airspeed by air intake valve is too little, influence oil gas mixing and burning effect, if adopt helical intake to produce the burning that eddy current improves middle-low load, then because the decline of charge flow rate coefficient, to cause engine performance to reduce, can't take into account for the high low-load of engine so simple air flue is revised.

Thereafter, it is the appearance that HONDA VETC engine is arranged, this engine is to utilize the valve system design to make engine when middle-low load, the general engine of air intake valve opening ratio is little, thus, owing to the airspeed by air intake valve speeds the combustion efficiency of engine in the time of can improving middle-low load, so engine when high load then because aperture is kept or promoted to air intake valve, so with the effect of the high torsion of low speed, high speed high pass filter.Only mechanism's complexity is the shortcoming of this system.

Recently, Ricardo Crankcase Scavenged 4 Stroke engines conception design is to utilize crankcase A supercharging impelling engine B admission space efficient to increase, to promote engine performance as shown in Figure 1.Though so can increase the admission space efficient of engine,, be the shortcoming that difficult filtration of organic oil and fuel feeding are restricted because crankcase A is all passed through in all air inlets.

Because above four-journey engine still has the disappearance that can't promote performance so far, though or engine performance can promote and still have above-mentioned disappearance.

Therefore, main purpose of the present invention is that a kind of by-pass gas inlet system of boosting of crankcase is being provided, it is that engine sectional area of air passage when middle-low load is dwindled, with the accelerating charge air-flow, make and form powerful flow-disturbing in the cylinder, to cause the engine combustion variability to reduce, the thin oil limit increases, thereby reaches fuel-efficient oligosaprobic purpose.

Of the present invention time a purpose is that a kind of by-pass gas inlet system of boosting of crankcase is being provided.It makes engine when full load, and air flue has the maximum access area, and utilizes boosting of crankcase to impel the engine air admittance volumetric efficiency to increase, and engine is reached best full load operation, to promote engine performance.

Another purpose of the present invention is that a kind of by-pass gas inlet system of boosting of crankcase is being provided, and not only taken into account fuel-efficient low pollution of engine middle-low load and high performance operational requirements, and mechanism is simple and reliable, and cost is low, and practicability is high.

The by-pass gas inlet system of boosting of crankcase is to be provided with outside main airway and the injection system in engine, and by boosting of crankcase with the guiding charge air flow, it is characterized in that:

Be provided with the less bypass air flue of sectional area between main airway and the crankcase again, the bypass air flue is communicated in the main airway, and its stage casing is communicated to crankcase, to reach by boosting of crankcase guiding charge air flow; Inner and be provided with air inlet guiding control valve in the bypass air flue, air inlet guiding control valve is adjusted by control mechanism control; This formation can make things convenient for Control Engine to form the air inlet flow-disturbing when middle-low load, to obtain thin oil rapid combustion effect; And during high load, utilize boosting of crankcase, the engine air admittance volumetric efficiency is increased, to promote engine performance; Described control mechanism can utilize throttle linkage, air inlet is vacuum-actuated or automatically controlled mode is adjusted air inlet guiding control valve; Be provided with one-way valve on the described bypass air flue again as leaf valve etc.; Described one-way valve can be loaded on again on the connecting tube that is communicated with crankcase; The end that described bypass conductance is connected in jet can be communicated on the injection system again and atomize with auxiliary fuel injector; The siphunculus stage casing of described connection bypass air flue and crankcase can be provided with pressure reduction control valve again, to let out the pressure that produces except that the effect of crankcase Pu; When it was applied to two larynx Carburetor engine, the front and back Duan Yike that is communicated with crankcase on the bypass air flue was provided with one-way valve respectively, but makes the Carburetor normal fuel injection; When it was applied to two larynx Carburetor engine, the throttle opening degree of being located on the bypass air flue was directly proportional with charge flow rate is rough; The wherein said air inlet guiding control valve opening degree of being located on the bypass air flue is directly proportional with the induction air flow ratio amount is rough; Described pressure reduction control valve opening degree is directly proportional with charge flow rate is rough; Described crankcase outlet port is provided with the machine oil occluding device, avoids entering main airway to isolate machine oil.

Be described further below in conjunction with the by-pass gas inlet system of accompanying drawing boosting of crankcase of the present invention, wherein:

Fig. 1 is the structural representation of known four-journey engine.

Fig. 2 is applied to the structural representation of Carburetor engine for the by-pass gas inlet system of boosting of crankcase of the present invention.

Fig. 3 is applied to two throttle position relativeness figure of Carburetor engine for the by-pass gas inlet system of boosting of crankcase of the present invention.

Fig. 4 is applied to the structural representation of oil spout engine for the by-pass gas inlet system of boosting of crankcase of the present invention.

Fig. 5 is applied to the control valve and the throttle position relativeness figure of oil sprayer engine for the by-pass gas inlet system of boosting of crankcase of the present invention.

Fig. 6 is applied to another structural representation of oil sprayer engine for the by-pass gas inlet system of boosting of crankcase of the present invention.

As shown in the figure, the by-pass gas inlet system of boosting of crankcase of the present invention, the device when it is applied to the Carburetor engine is as shown in Figure 2; Its device that is applied to the oil spout engine then as shown in Figure 4; And when being applied to Carburetor engine or oil spout engine, the relative opening degree of its control valve and throttle is then respectively as Fig. 3, shown in Figure 5;

As shown in Figure 2, the by-pass gas inlet system of boosting of crankcase of the present invention, when being used in engine 1 with two larynx Carburetors, in main airway 11, be provided with first throttle 12, main airway 11 is communicated to the engine cylinder place and is provided with suction valve 13, and other is provided with bypass air flue 14 and extends from main airway, and second throttle 15 is then arranged in bypass air flue 14,14 usefulness connecting tube 16 of bypass air flue are communicated to crankcase 10, and the front and back fragment position that connects pipe 16 in bypass air flue 14 respectively is provided with one- way valve 17,18; And the crankcase outlet port more is provided with machine oil occluding device 40, enters main airway 11 in order to isolate machine oil.

Use the Carburetor engine 1 of the by-pass gas inlet system of boosting of crankcase of the present invention, under low-load during start, required air inflow is less, first throttle 12 of main airway 11 is closed fully, air-flow passes through bypass air flue 14 through second throttle 15 fully, bypass air flue 14 is then little than main airway 11 because of sectional area, and because crankcase 10 pressurizations cause air-flow to quicken; In addition, it is interior near suction valve 13 places to utilize 14 mouthfuls of bypass air flues to extend to main airway 11, enters cylinder 19 according to preferable by-pass Way out air-guiding, makes and forms powerful flow-disturbing in the cylinder 19, to obtain the effect of thin oil rapid combustion; When the making dynamic load and improve gradually of engine 1, first throttle 12 is progressively opened, and second throttle 15 of bypass air flue is standard-sized sheet also, and utilizes crankcase 10 superchargings, increases thereby can reach the engine air admittance volumetric efficiency, promotes the purpose of engine performance.

The present invention is in order to reach the above-mentioned purpose gas handling system, the degree that its first throttle, second throttle are opened and the relation of charge flow rate, be to adjust with relativeness position as shown in Figure 3, the throttle opening degree of being located on the bypass air flue is directly proportional with induction air flow ratio is rough.

The setting of the one- way valve 17,18 in the bypass conductance 14 then can make the air-flow that flows out from crankcase 10, enters cylinder by external environment really, and air-flow quickens and the effect of supercharging to reach.

And order, the setting of one- way valve 17,18 more can make the Carburetor normal fuel injection on the bypass air flue 14, because second throttle 15 is long to the passage between the crankcase 10, fuel oil separates easily with fresh air, is unlikely the situation that causes fuel oil to enter crankcase 10; And the set machine oil occluding device 30 of crankcase outlet then can avoid entering main airway 11 in order to isolate machine oil.

As shown in Figure 4, when the by-pass gas inlet system of boosting of crankcase of the present invention is applied to the oil spout engine, on the engine 2 except being provided with oil nozzle 21, throttle channel 22, other is provided with the bypass air flue 23 that is communicated to main airway 11, be provided with throttle 221 in the throttle channel 22, bypass air flue 23 is to be connected to crankcase 20 by a connecting pipe 24, device air inlet guiding control valve 25 in bypass air flue 23, this air inlet guiding control valve 25 is by control mechanism 26 start of controlling, and control mechanism 26 can be induction-pipe depression mechanism, automatically controlled or throttle linkage; In connecting tube 24 sidewall and connect time conduit 27, be to be provided with pressure reduction control valve 28 in the inferior conduit 27, pressure reduction control valve 28 is by control mechanism 30 start of controlling, control mechanism 30 can be induction-pipe depression mechanism, automatically controlled or throttle linkage, is respectively equipped with the one-way valve 291,292 as leaf valve in bypass conductance 23 and time conduit 27.

Use the oil spout engine 2 of the by-pass gas inlet system of boosting of crankcase of the present invention, during start also as mentioned above, under low-load during start, required air inflow is less, throttle 221 is closed fully, air-flow is adjusted air inlet guiding control valve 25 suitable aperture ratios to control suitable air inflow fully by bypass air flue 23 so see through control mechanism 26.Close fully owing to throttle channel 22 paths this moment, air-flow is fully by bypass air flue 23, and bypass air flue 23 sectional areas are little than throttle channel 22, and because crankcase 20 pressurizations, cause air-flow to quicken, and the bypass air flue extend to throttle channel 22 near air inlet valve position for 23 mouthfuls, enters cylinder according to preferable by-pass Way out air-guiding, and make the powerful flow-disturbing of formation in the cylinder, to obtain the effect of thin oil rapid combustion; When the making dynamic load and improve gradually of engine 2, throttle 221 is progressively opened, air inlet guiding control valve 25 standard-sized sheets of bypass air flue, and utilize crankcase 20 superchargings impelling engine air admittance volumetric efficiency to increase, to promote engine performance.

The setting of the one-way valve 291,292 in bypass conductance 23 and time conduit 27 then can make the air-flow that flows out from crankcase 20, enters cylinder by external environment really, and air-flow quickens and the effect of supercharging to reach.

In addition, as shown in Figure 4, engine 2 is when utmost point low-load, because the engine air admittance amount is low, and the aperture of air inlet guiding control valve 25 is little, helps Pu (Pumping) effect to continue cumulative stress for fear of crankcase 20, build-up of pressure is too high, is the setting that pressure reduction control valve 28 is arranged, to solve these problems.

The present invention is in order to reach the above-mentioned purpose gas handling system, the relativeness of degree that its air inlet guiding control valve, pressure reduction control valve are opened and throttle, charge flow rate, be to adjust with relativeness position as shown in Figure 5, air inlet on bypass air flue guiding control valve 25 opening degrees are directly proportional with induction air flow ratio is rough, pressure reduction control valve 28 opening degrees and induction air flow ratio is rough is inversely proportional to.

Please consult Fig. 6 again, when the by-pass gas inlet system of boosting of crankcase of the present invention is applied to the oil spout engine, bypass air flue 31 directly is mounted on the injection system of oil nozzle 32, then can quicken, so these gas handling systems of the present invention are the effect with auxiliary fuel injector atomizing because of the boosting of crankcase effect impels air inlet.

In sum, the by-pass gas inlet system of boosting of crankcase of the present invention has the following advantages:

1. utilize the bypass airway device to form the air inlet flow-disturbing, the pollution that can improve the engine middle-low load with Oil consumption, and promote horsepower.

2. utilize boosting of crankcase to impel engine air admittance volume efficient to increase, to promote engine performance.

3. be used in the oil spout system, have the effect of auxiliary fuel injector atomizing.

From the above as can be known, the by-pass gas inlet system of boosting of crankcase of the present invention really has to improve and draws Hold up pollution and the oil consumption of middle-low load, and promote horsepower lifting engine performance, and have auxiliary spray The effect of mist of oil, and these effects can be improved the fraud of four-journey engine really.

Claims (11)

1. A bypass air intake system for crankcase supercharging is provided on the engine outside the main air passage and the fuel injection system, and is supercharged by the crankcase to guide the intake air flow, and is characterized in that: A bypass air passage with a smaller cross-sectional area is provided between the main air passage and the crankcase. The bypass air passage is connected to the main air passage, and its middle section is connected to the crankcase to achieve the introduction of the intake air flow by the crankcase pressurization; There is an intake pilot control valve inside the bypass air passage, and the intake pilot control valve is controlled and adjusted by a control mechanism; this structure can conveniently control the intake air turbulence formed by the engine at low and medium loads, so as to obtain the rapid flow of thin oil. Combustion effect; when the load is high, the crankcase booster is used to increase the intake volume efficiency of the engine to improve engine performance. 2. The crankcase pressurized bypass air intake system according to claim 1, wherein the control mechanism can adjust the air intake guidance control by throttle linkage, intake vacuum actuation or electronic control valve. 3. The crankcase pressurized bypass air intake system according to claim 1, wherein a check valve such as a reed valve is provided on the bypass air passage. 4. The crankcase pressurized bypass air intake system according to claim 3, wherein said one-way valve can be mounted on the connecting pipe communicating with the crankcase. 5. The crankcase pressurized bypass air intake system according to claim 1, wherein the end of the bypass air guide connected to the fuel injection port can be connected to the fuel injection system to assist fuel injection Atomization. 6. The bypass air intake system for crankcase supercharging according to claim 1, wherein a decompression control valve can be set in the middle section of the through pipe connecting the bypass air passage and the crankcase to discharge the crankcase. The pressure generated by the tank pump action. 7. The bypass air intake system of crankcase supercharging according to claim 1, characterized in that, when it is applied to a double-throat carburetor engine, a single valve can be respectively arranged at the front and rear sections of the bypass air passage connected to the crankcase. to the valve so that the carburetor can supply oil normally. 8. The bypass air intake system for crankcase supercharging according to claim 1, wherein when it is applied to a double-throat carburetor engine, the degree of opening of the throttle on the bypass air passage is approximately proportional to the intake flow rate. Proportional. 9. The crankcase pressurized bypass intake system according to claim 1, wherein the opening degree of the intake pilot control valve arranged on the bypass passage is roughly proportional to the intake flow rate. 10. The crankcase pressurized bypass air intake system according to claim 1, wherein the opening degree of the decompression control valve is roughly proportional to the intake air flow. 11. The crankcase pressurized bypass air intake system according to claim 1, wherein an oil blocking device is arranged at the outlet of the crankcase to isolate the oil from entering the main air passage.

Images