WO2000065220A1 - Carburateur variable de type venturi avec dispositif de dosage de carburant variable - Google Patents
Carburateur variable de type venturi avec dispositif de dosage de carburant variable Download PDFInfo
- Publication number
- WO2000065220A1 WO2000065220A1 PCT/JP2000/002533 JP0002533W WO0065220A1 WO 2000065220 A1 WO2000065220 A1 WO 2000065220A1 JP 0002533 W JP0002533 W JP 0002533W WO 0065220 A1 WO0065220 A1 WO 0065220A1
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- WIPO (PCT)
- Prior art keywords
- jet
- needle
- carburetor
- diameter
- section
- Prior art date
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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
- F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
- F02M19/04—Fuel-metering pins or needles
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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
- F02M9/00—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position
- F02M9/02—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves, e.g. of piston shape, slidably arranged transversely to the passage
- F02M9/06—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves, e.g. of piston shape, slidably arranged transversely to the passage with means for varying cross-sectional area of fuel spray nozzle dependent on throttle position
Definitions
- the present invention relates to reducing the fuel flow variation among individual carburetors of a variable venturi type carburetor for a spark ignition internal combustion engine provided with a variable fuel metering device comprising a jet needle and a dolette which are in contact with each other.
- variable venturi carburetors for spark-ignited internal combustion engines that have a variable fuel metering device consisting of a jet dollar and a 21 dollar jet, with respect to the structure of the variable fuel metering device. That is, the jet needle is movably supported so as to be swingable, and the jet needle is allowed to come into contact with the needle by the force of gravity, suction air or a spring or the like, thereby forming a gap as a fuel measuring portion between the two.
- the gap is formed without allowing the jet needle to swing so as to be non-swingable and not allowing contact with the needle jet. At present, the latter is hardly practically used due to difficulties in manufacturing, and the former is exclusively employed.
- the variable venturi-type vaporizer includes a so-called piston valve type in which a valve device forming a venturi also serves as a throttle valve, and a so-called constant vacuum type in which a valve device forming a bench lily is a negative pressure operated valve.
- the constant vacuum type the negative pressure operated valve is held open in advance so that the cross-sectional area of the bench lily becomes a certain value, and the negative pressure operated valve is maintained until the intake air volume reaches a certain value.
- the former requires a low-speed fuel system, but a comparison from idling to low-load areas where reduction of harmful components in exhaust gas is particularly necessary.
- a wide range of intake air can be handled in a state where the cross-sectional area of a part of the Venturi takes the minimum value, and the variation in fuel flow rate in the low-load region is smaller than the latter, and it is widely used because it has advantages.
- the latter does not necessarily require a low-speed fuel system and has a simple structure, but has the drawback that the fuel flow varies greatly in the low-load region, and is hardly used at present.
- the shape of the jet dollar section housed in the section is formed by a combination of a straight section having a constant diameter and an upstream taper section connected to this section on the upstream side of the fuel flow. It is. Although it is possible to form this part only with a tapered part without a straight part, the fuel flow rate changes sensitively due to the positional variation of the jet needle in the direction of displacement, and there are two problems during use.
- variable venturi-type carburetor takes a value near the minimum value when the internal combustion engine operates at low load. In this operating region, it is necessary to keep the fuel flow between carburetors low, because of the demands such as suppression of harmful components in exhaust gas and reduction of fuel consumption. It is widely known that the variation in the relative position of the jet dollar in and out of the two-jet jet greatly affects the fuel flow rate, and several measures have already been taken.
- the contact between the jet needle and the needle jet is determined according to the magnitude of the relative angle.
- the shape of the three-dimensional void formed between the outer surface of the jet needle and the inner surface of the metering section of the $ 21 jet is different.
- a difference occurs in the passage resistance when passing through the gap, and the difference in the passage resistance causes the fuel to generate a fuel flow variation among the carburetors.
- FIGS. 4, 5 and 6 three patterns of the contact between the jet needle and the needle jet in the conventional vaporizer will be described.
- Figure 4, Figure 5 and Figure 6 show the dollet jets of three conventional constant-vacuum variable bench lily-type vaporizers when the cross-sectional area of a part of the bench takes the minimum value.
- FIG. 5 is a conceptual diagram schematically illustrating a portion of a jet dollar stored in a measuring section and schematically showing a partial cross section thereof.
- the three vaporizers have the same specifications and belong to the same production group, but differ only in the dimensional errors of the parts involved in determining the dimensions of xl, X2, and X3 in each figure.
- a pin (2 1) penetrating through the jet needle (1) is fixed to the jet needle (1) at a point G in each figure in a direction perpendicular to the plane of the drawing. ing.
- the pin (2 1) is rotatably inserted into a hole for accommodating the negative pressure operated valve (2 2) of the constant-vacuum vaporizer without any gap.
- the jet needle (1) is positioned at the center of the hole for accommodating the pin (21) shown as a point G in each figure, that is, at the same position as the center of the pin (21). It is positioned in the vertical and vertical directions.
- the negative pressure operated valve (22) is housed in a negative pressure operated piston bore (24) of the mixing body (103), and the lower end thereof is seated on the end face of the negative pressure operated piston bore (24). ing.
- the negative pressure operated valve (22) does not descend from this position, and at this position, the cross-sectional area of the bench lily (108) takes the minimum value.
- the upper end of the negative pressure actuated valve (2 2) Is equipped with a diaphragm. Through the negative pressure inlet (25), the negative pressure of the bench lily (108) is introduced to the upper surface. Until the intake air volume reaches a certain value, the negative pressure operation piston (22) stays in the seating position, but after a certain value, the diaphragm raises the negative pressure operation valve (22) upward against the gravity. You.
- the jet needle (1) is inserted into the measuring part (4) which is the narrowest part of the needle jet (3).
- the shape of the part accommodated in the metering section (4) of the jet 21 (1) is the straight section (5) and the upstream taper section (6) located upstream of the fuel flow. Is formed.
- the jet needle (1) is pushed to the downstream side, that is, to the left by the intake air flowing from the right to the left in each figure. (4) is in contact with points C1, C2 and C3 in each figure.
- the outer diameter of the straight part (5) of the needle top (1) on Dietz is Dn
- the inner diameter of the measuring part (4) of the needle jet (3) is Dj.
- the jet needle (1) swings freely about the point G as a pendulum in the horizontal direction in each figure. Not only these three carburetors but also all carburetors of the same type that allow the swing of the jet needle (1), the center line of the needle 21 ).
- the plane on which the trajectory of the center line of the jet needle (1) moves during the pulsating motion will be referred to as the jet needle swing plane below.
- the driving surface of the jet dollar coincides with a plane obtained by taking a cross section of each figure, that is, a plane drawn in each figure.
- the straight line indicated by EE in each figure is obtained by positioning the jet needle (1) in the direction perpendicular to the center line of the measuring part (4) of the needle (3) on the swing surface of the jet.
- the straight line passes through point G, and is orthogonal to the center line of the measuring section (4) of the 21 dollar jet (3).
- This straight line is hereinafter referred to as a virtual support point movement line (9).
- the intersection of the virtual support point movement line (9) and the center line of the jet needle (1) is hereinafter referred to as the virtual support point (2).
- the virtual support point (2) coincides with point G.
- the position of the virtual support point (2) on the virtual support point movement line (9) is determined by the error in the dimensions of the parts involved in determining the position of the virtual support point (2) on the virtual support point movement line (9). Change.
- the distance from the virtual support point (2) to the center line of the measuring part (4) of the needle jet (3) is hereinafter referred to as a deviation X.
- the coordinates of the deviation X are plotted on the virtual support point movement line (9), and the intersection (10) of the virtual support point movement line (9) and the center line of the measuring section (4) of the 21 dollar jet (3) is calculated. Jet needle at the origin
- the direction in which the tip of (1) swings is negative in the left direction in each figure, and positive in the opposite direction and right in each figure.
- the position on the virtual support point movement line (9) in (2) differs depending on the dimensional errors of the parts involved.
- the deviations in FIGS. 4, 5 and 6 are xl, X2 and X3, respectively.
- this error is represented by the horizontal position variation of the pin (21) in each figure.
- the contact pattern shown in Fig. 4 is that the deviation X is such that the center line of the jet needle (1) and the center line of the metering section (4) of the 21 dollar jet (3) are parallel and the relative angle u between them. Is zero, and the deviation X is smaller than Xa.
- xa is the direction in which the jet needle (1) swings, that is, the negative direction, the absolute value of which is two dollars.
- the jet needle (1) has a straight line from the inner diameter D j of the measuring part (4) of the jet (3). This is a deviation amount of 12 obtained by subtracting the outer diameter Dn of the part (5).
- the contact pattern shown in FIG. 5 is a region where the relative angle u is between zero and 12 of the taper angle of the upstream taper portion (6), and the deviation X is from Xa to Xb. For convenience, if X equals Xa or Xb, it shall be included in this pattern.
- the contact pattern in Fig. 6 is the area where the deviation x is larger than xb.
- C Fig. 7 shows the passage of fuel along the horizontal axis with the deviation X of the virtual support point (2) of the jet needle (1).
- FIG. 5 is a diagram showing the Xr characteristic tendency of the vaporizer with the resistance r on the vertical axis.
- the transmission resistance r is the reciprocal of the proportionality constant between the fuel flow rate and the square root of the pressure difference between the inlet and outlet of the metering section (4) of the two-jet (3).
- the scale of the passing resistance r indicates the ratio that takes the minimum value of 1 in the study area.
- examples of the Xr characteristic curves of the conventional vaporizers shown in FIGS. 4, 5 and 6 are shown by chain lines. From this we can see the following.
- the Xr characteristic curve has a downward convex shape.
- the contact point C1 between the jet needle (1) and the 21-dollet (3) is located at the most abraded part in the use process, so the fuel in the use process
- the increase in flow rate is greater than in other patterns.
- the contact butter shown in Fig. 4 also has a problem that this wear resistance is poor.
- An object of the present invention is to reduce the problem of the fuel flow variation among the individual units of the conventional variable venturi type carburetor based on the above findings and suggestions. Disclosure of the invention
- the Jutney dollar stored in the metering section of the needle jet is such that the diameter of the jet needle is the largest between the parts, the maximum diameter part is connected to the maximum diameter part upstream of the fuel flow, and the upstream taper part and the maximum diameter part And means for forming a shape formed by a downstream small-diameter portion connected downstream of the fuel flow. If necessary, a means for biasing the virtual support point in advance in the direction in which the jet needle swings and contacts the metering section of the needle jet, that is, in the negative direction, is also employed.
- FIGS. 8, 9 and 10 a pattern relating to the mode of contact between the jet needle and the needle jet generated in the variable venturi type vaporizer according to the present invention employing the above-described means will be described.
- FIGS. 8, 9 and 10 show the needle jets of the three constant-vacuum type variable venturi type vaporizers according to the present invention, respectively, when the cross-sectional area of a part of the venturi takes a minimum value.
- FIG. 3 is a conceptual diagram schematically illustrating a partial cross section of a portion of a jet needle accommodated in the measuring section.
- the three vaporizers have the same specifications and belong to the same production group, but differ only in the dimensional errors of the parts involved in determining the size of X1, X2 and X3 in each figure.
- Figure 8 In Figs. 9 and 10, the jet needle (1) has a short straight-shaped maximum diameter section (6), an upstream taper section (7), and a downstream small-diameter section not found in conventional vaporizers. (8) Provided with a shape. The jet needle (1) is in contact with the measuring section (4) of the needle jet (3) at points Kl, â 2 and â 3 in each figure.
- the minimum value of the passage resistance r is equal to that of the conventional vaporizer shown in Figs. 4, 5 and 6.
- the conventional vaporizer shown in Figs. 4, 5 and 6 and the vaporizer according to the present invention shown in Figs. 8, 9 and 10 have no difference in specifications except for the shape of the jet needle (1). All equal.
- the displacement X of the virtual support point (2) of the jet needle (1) is X1, X2, X, respectively. 3 equal.
- the contact pattern in FIG. 8 is substantially equal to that in FIGS. 5 and 9. Therefore, in the region where the amount of deviation X is at least larger than X1, the contact pattern of FIG. 4 existing in the gasifier does not appear, and therefore, two contact butters substantially corresponding to FIG. 5 and FIG. Only exist.
- the contact pattern substantially corresponding to FIG. 5 of the conventional carburetor is in a region from the value of the deviation X smaller than X1 to Xb. In this area, the direction in which the jet needle (1) is pushed and oscillated, that is, the negative The orientation has been expanded.
- the X-r characteristic curve has a downwardly convex shape like the conventional vaporizer, but it is more flat than the conventional one in the range from the value of the deviation X smaller than X1 to Xb. I have. This is because the contact pattern in FIG. 4 was substantially changed to the contact pattern in FIG.
- the X-r characteristic curve is flatter than before. Since the shape of the upstream tapered portion (6) on the upstream side and the shape of the downstream small diameter portion (8) on the downstream side are substantially symmetrically similar to the maximum diameter portion (7), the amount of deviation X is small. At the time of change, the passage resistance on the upstream side and the downstream side of the maximum diameter part (7) increases on one side and decreases, and on the other side decreases Z increases, so that both changes cancel each other out. That is, by forming the shape of the downstream small-diameter portion (8) also to be tapered, a strong canceling action is exhibited, and the effect of further suppressing the change in the fuel flow rate is obtained.
- the passing resistance r is determined by the relative angle u between the center line of the jet needle (1) and the center line of the measuring part (4) of the needle jet (3). Is minimized in the deviation Xa at which is zero.
- the means for forming the jet needle (1) to have the downstream small-diameter portion (8) attached thereto is conventionally used for the virtual support point (2) of the jet needle (1).
- the jet needle (1) is pushed from the center line of the needle jet (3) to the virtual support point (2) of the jet-dollar (1) and swings, that is, an appropriate bias is made in advance in the negative direction. If the median or mode of production variation is deviated in the negative direction by giving the quantity, it can be obtained with the contact patterns of Figs. 8 and 9 while moving away from the area where the contact pattern of Fig. 10 occurs. It can be seen that the flat part of the X-r characteristic can be used effectively.
- the contact pattern shown in FIG. 4 does not occur even if the amount of deviation given to the virtual support point (2) is large, so that the deviation X It is clear that the degree of freedom has increased.
- the vaporizer according to the present invention has more fuel passage than that of the conventional vaporizer due to the change in the relative angle between the jet needle and the twenty-one jet governed by the deviation X of the virtual support point (2).
- the change in resistance is suppressed to a small value, and thus the effect of reducing the variation in the fuel flow between individual vaporizers is obtained.
- the vaporizer is a constant-vacuum type, and the vacuum valve is kept open in advance so that the cross-sectional area of a part of the venturi becomes a constant value, and the vacuum is maintained until the intake air volume reaches a certain value.
- the bench lily should have a minimum cross-sectional area in a relatively wide range of intake air from idling to low load range. Since the present invention can be applied, the present invention has an effect particularly in a wide intake air amount range when applied to a carburetor of this type.
- the carburetor is of the Biston valve type, part or all of the fuel from the main system consisting of the jet dollar and the needle jet, even when the internal combustion engine is idling, regardless of whether it has a low-speed fuel system or not. Is generally supplied. Since idling occurs frequently, it is more important to reduce the variation in fuel flow during idling than in other operating areas to reduce harmful components in exhaust gas. Although the main system of the conventional biston valve type carburetor has a large variation, it has not been possible to sufficiently meet this requirement. However, the present invention has a particularly high effect in reducing the variation in the fuel flow during idling operation.
- Fig. 4, Fig. 5, Fig. 6, Fig. 8, Fig. 9 and Fig. 10 are diagrams showing the concept and differ from the dimensions of a practical vaporizer for the sake of explanation.
- Xa and xb in each drawing are often about 0.05 to 0.2 mm.
- FIG. 1 is a sectional view at the center of an intake passage of a carburetor according to an embodiment of the present invention.
- FIG. 2 is a partial cross-sectional view in which main parts of the vaporizer of FIG. 1 are extracted and enlarged.
- FIG. 3 is a top view of the seat portion (205).
- FIG. 4 is a partial cross-sectional view for explaining the concept of the main part of the conventional example of the carburetor when the amount of deviation is small.
- FIG. 5 is a partial cross-sectional view for explaining the concept of the main part of the conventional carburetor example in the case of the deviation amount.
- FIG. 6 is a partial cross-sectional view for explaining the concept of the main part of the conventional example of the carburetor when the amount of deviation is large.
- FIG. 7 is a diagram illustrating a characteristic curve of the amount of deviation X and the passing resistance r of the vaporizer.
- FIG. 8 is a partial cross-sectional view for explaining the concept of the main part of the example of the vaporizer according to the present invention when the amount of deviation is small.
- FIG. 9 is a diagram illustrating the concept of the main part of the example of the vaporizer according to the present invention in the case of the deviation amount.
- FIG. 10 is a partial cross-sectional view for explaining the concept of the main part of the example of the vaporizer according to the present invention when the amount of deviation is large.
- FIG. 1 is a cross-sectional view at the center of an intake passage of a biston valve carburetor according to an embodiment of the present invention.
- a carburetor (102) is connected to an intake port of a spark ignition internal combustion engine at a left end flange portion.
- This vaporizer (102) is assembled from parts finished to the standard dimensions, and is an individual located at the center of the variation in production.
- An intake passage (105) having a circular cross-sectional shape passes through the mixing body (103) of the carburetor (102).
- a substantially cylindrical throttle valve (104) is housed in a throttle bore (200) orthogonal to the intake passage (105), and the minimum opening of the throttle valve (104) is omitted in the figure. The opening is maintained as shown by the limiting stop screw.
- a cable (201) is attached to the throttle valve (104).
- the throttle valve (104) piles on the force of the return spring (202) mounted on the holder (203) in the throttle valve (104). While entering and leaving the intake passage (105).
- the state shown in FIG. 1 is a state in which the opening of the throttle valve (104) is idling of the spark ignition internal combustion engine, and this is a state in which the area of the bench lily of the carburetor (102) takes the minimum value.
- a rib-like projection is made around.
- a jet needle (1) is inserted into a jet needle receiving hole (109) inside the throttle valve (104).
- the tilt spring (111) is compressed and housed in the holder (203) and pushes the jet needle (1) downward in the figure.
- a ring (204) is fixed to the jet needle (1), and the ring (204) is in contact with the edge of the seat (205) of the throttle valve (104). The configuration details of this part will be described later with reference to FIG.
- the jet dollar (1) also contacts the inner peripheral surface of the receiving hole (109) at point P in the figure, at which point it is positioned horizontally in the figure.
- the outer diameter of the relevant part of the jet needle (1) is slightly smaller than the inner diameter of the receiving hole (109), and the jet needle (1) acts on the gap created by this dimensional difference by the force of the tilt spring (1 1 1). It oscillates by receiving the clockwise moment by and contacts the needle jet (3) at point K in the figure.
- Point G in the figure is the virtual support point (2) of the vaporizer.
- the $ 21 jet (3) is press-fitted into the mixing body (103) and has a metering section (4) that is the narrowest part.
- the 21 dollar jet (1) is inserted into the measuring section (4) of the 21 dollar jet (3).
- a constant oil level is formed by the float (1 16), and the fuel stored in the fuel reservoir (1 1 7) below the constant oil level is used for the jet nozzle (1 1 5).
- the fuel passage (118) are configured to be measured by the passage resistance in the gap between the measuring section (4) and sucked into the bench lily (108).
- Fig. 2 shows the essential parts of the throttle valve (104), the jet needle (1), and the needle jet (3) of the carburetor of Fig. 1, and the intake passage (10 5) is a partial sectional view at the center of FIG.
- the part of the Jut needle (1) accommodated in the measuring part (4) of the needle jet (3) is composed of the maximum diameter part (7), the upstream taper part (6) and the downstream small diameter part (8).
- the force that the inclined spring (1 1 1) tries to expand is distributed and acts downward on the disc-shaped ring (204) fixed to the upper part of the jet needle (1) in each figure. It is equivalent to the central point F acting as a single force.
- the ring (204) usually has two points on the ridge (206) of the edge of the seat (205), which is approximately half-moon-shaped when viewed from A in the figure provided on the throttle valve (104). And are positioned vertically in the figure. The contact point on this ridge line (206) is the fulcrum of the movement of the jet needle (1).
- FIG. 3 is a top view of the seat portion (205) viewed from A in FIG. The maximum slope of the substantially semilunar surface of the seat (205) has a slope of the angle e in FIG. When the jet needle (1) tilts in the counterclockwise direction in the figure, the inclination becomes large due to the deviation X force, and the absolute value becomes large. Necessary to not allow only one point to contact the seat (205).
- the angle e of the maximum slope of the seat (205) is 3 degrees.
- the taper angle of the upstream taper (6) is 1 degree 20 minutes (about 1.333 degrees).
- the downstream small-diameter portion (8) is also tapered, One par angle is 1 degree 20 minutes (about 1.333 degrees).
- the taper angle of the downstream small-diameter portion (8) is an angle at which the occurrence of the contact pattern shown in FIG. 4 can be stopped within the range of variation in production, and the upstream and downstream sides of the maximum-diameter portion (7) are sandwiched. It is selected to be equal to the taper angle of the upstream taper (6) so that the target shape is realized on the side.
- the largest diameter part (7) is a short straight shape with a diameter Dm of 2.4 mm and a length of 0.5 mm.
- the vertical distance between P, h in Figure 2 is 15 millimeters. That is, the vertical distance between point K and the virtual support point (2) of the main vaporizer (102) is 15 mm.
- the length of the measuring part (4) of the needle jet (3) is 4 mm.
- the horizontal position of the center is more negative than the center line position of the metering part (4) of the dollar jet (3). In the direction of 0.025 mm.
- the mounting position of the horizontal jet 21 (1) is given a bias of minus 0.025 mm in advance.
- the diameter of the jet needle receiving hole (109) is 4.05 mm, and the diameter of the part of the jet needle (1) to be inserted is 4 mm. Since both dimensions are obtained by simple boring and boring, the variation in these diameters is negligibly small compared to the variation associated with other offsets.
- Figure 2 Smell The ring (206) is horizontal, and no horizontal component is generated from the force of the tilt spring (1 1 1), but the jet needle (1) accommodates the jet needle due to the force of the intake air flow. In the hole (109), it is deviated to the left in the figure, in the negative direction, and is positioned at point P in the horizontal direction in each figure.
- the center line of the jet needle (1) is shifted to the left of the center line of the jet needle receiving hole (109) by a difference of 12 and 0.025 mm in the negative direction.
- the jet needle (1) is provided at this deviation minus 0.025 mm and the perforated position of the aforementioned jet needle receiving hole (109).
- the deviation is minus 0.05 mm, shown as X 0 in FIG. 2 with the deviation minus 0.025 mm. Therefore, the deviation X of the virtual support point (2) is minus 0.05 mm.
- the ring (204) tilts downward to the right in FIG.
- the contact point between the juddle (1) and the accommodation hole (109) moves to the point G opposite to the point P.
- the jet 21 dollar (1) is located inside the jet 21 dollar receiving hole (109) in the right direction in each figure, in the positive direction, about 1/2 of the difference between the diameters of both, 0.025 mm. Bias by one torr.
- the parts that govern the relative horizontal position of the center of the jet needle receiving hole (109) and the center of the metering section (4) of the needle jet (3) of the production vaporizer group to which this vaporizer belongs The range of the position variation related to the deviation X caused by the accumulation of dimensional errors in production is from minus 0.13 mm to plus 0.13 mm with respect to the reference position.
- the operation of the vaporizer according to the embodiment of the present invention having the above-described configuration and the effect obtained thereby will be described.
- the relative angle between the center line of the jet needle (1) and the center line of the needle jet (3) measuring section (4) is small.
- the cosine of the corner shall be considered to be 1.
- the vaporizer shown in Fig. 1, Fig. 2 and Fig. 3 is located at the center of the variation as described above.
- the operation and effect of the configuration of the present invention will be described by applying the limit value of the variation in production to this.
- the minimum value xmin of the deviation X is defined as the deviation minus 0.025 mm and the jet needle (109) of the jet needle (1) given at the position of the jet needle receiving hole (10) in advance.
- the internal deviation is about minus 0.25 millimeters and the variation e1 minus 0.13 millimeters minus 0.18 millimeters.
- the maximum value of the displacement X, xmax is determined by the deviation minus 0.025 mm previously given at the position of the jet needle housing hole (109) and the needle jet inside the jet needle housing hole (109).
- the contact pattern for all the individuals is maintained in the patterns shown in FIGS. 8 and 9, and the fuel passage resistance between the vaporizers is reduced.
- the effect of suppressing the variation to be small can be obtained.
- the deviation X is reduced from 0.15 mm to 0.1 mm.
- the contact pattern shown in FIG. 4 is obtained in a region less than minus 0.05 mm, and the contact pattern shown in FIG. 6 is obtained in a region exceeding approximately plus 0.138 mm. Therefore, the contact pattern in Fig. 5 where the flow rate change is small is limited to a narrow range from minus 0.05 mm to about plus 0.138 mm.
- the cross-sectional shape of the measuring portion of the jet needle and the needle jet does not necessarily have to be circular. What is necessary is just to read like a cross-sectional area part.
- the direction of displacement of the jet needle (1) does not need to be orthogonal to the intake passage (105).
- the carburetor according to the present invention is useful as a carburetor for a spark-ignition internal combustion engine, which needs to maintain a high fuel flow rate with high demands such as reduction of harmful components in exhaust gas and reduction of fuel consumption. is there.
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- General Engineering & Computer Science (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
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3. ãžã§ããããŒãã« ïŒ1) ã®äžå¿ç·ãšããŒãã«ãžã§ãã ïŒ3) ã®èšééš ïŒ4 ) ã®äžå¿ç·ã®çžå¯Ÿäœçœ®ãã äž¡äžå¿ç·ãéãªãäœçœ®ãããžã§ããããŒãã« ïŒ1) ãæºåããŠã㌠ãã«ãžã§ãã ïŒ3) ã®èšééš ïŒ4) ã«æ¥è§ŠããŠããåãã«ãã å ããåŒãé¢ãããšããã®è«æ±é
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4. æ°ååšã¯å®ç空åŒæ°ååšã§ããã ãã€ã ãã®è² å§äœååŒ ïŒ22) ã圢æã ããã³ããŠãªäžéš (108) ã®æé¢ç©ã®å€§ãããå°ãªããšãç«è±ç¹ç«å
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP11156932A JP2000310160A (ja) | 1999-04-26 | 1999-04-26 | å¯å€çæèšéè£ çœ®ãæããå¯å€ãã³ãã¥ãªãŒåæ°ååš |
JP11/156932 | 1999-04-26 |
Publications (1)
Publication Number | Publication Date |
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WO2000065220A1 true WO2000065220A1 (fr) | 2000-11-02 |
Family
ID=15638514
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/002533 WO2000065220A1 (fr) | 1999-04-26 | 2000-04-19 | Carburateur variable de type venturi avec dispositif de dosage de carburant variable |
Country Status (2)
Country | Link |
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JP (1) | JP2000310160A (ja) |
WO (1) | WO2000065220A1 (ja) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2569147A (en) * | 1947-03-04 | 1951-09-25 | Carter Carburetor Corp | Metering rod support |
JPS55135141U (ja) * | 1979-03-20 | 1980-09-25 | ||
JPS59144154U (ja) * | 1983-03-17 | 1984-09-26 | æ¥ç£èªåè»æ ªåŒäŒç€Ÿ | å¯å€ãã³ããŠãªåæ°ååš |
JPS6034549U (ja) * | 1983-08-17 | 1985-03-09 | æäžå·¥æ¥æ ªåŒäŒç€Ÿ | å¯å€ãã³ãã¥ãªæ°ååš |
JPS6226552U (ja) * | 1985-07-31 | 1987-02-18 | ||
JPS62128153U (ja) * | 1986-02-06 | 1987-08-13 | ||
JPS62188542U (ja) * | 1986-05-23 | 1987-12-01 | ||
JPH0378952U (ja) * | 1989-12-06 | 1991-08-12 | ||
JPH0387857U (ja) * | 1989-12-22 | 1991-09-06 | ||
JPH0583348U (ja) * | 1992-04-13 | 1993-11-12 | æ ªåŒäŒç€Ÿäº¬æµç²Ÿæ©è£œäœæ | æ°ååšã«ããããžãšããããŒãã«æ¯æè£ çœ® |
-
1999
- 1999-04-26 JP JP11156932A patent/JP2000310160A/ja active Pending
-
2000
- 2000-04-19 WO PCT/JP2000/002533 patent/WO2000065220A1/ja active Application Filing
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2569147A (en) * | 1947-03-04 | 1951-09-25 | Carter Carburetor Corp | Metering rod support |
JPS55135141U (ja) * | 1979-03-20 | 1980-09-25 | ||
JPS59144154U (ja) * | 1983-03-17 | 1984-09-26 | æ¥ç£èªåè»æ ªåŒäŒç€Ÿ | å¯å€ãã³ããŠãªåæ°ååš |
JPS6034549U (ja) * | 1983-08-17 | 1985-03-09 | æäžå·¥æ¥æ ªåŒäŒç€Ÿ | å¯å€ãã³ãã¥ãªæ°ååš |
JPS6226552U (ja) * | 1985-07-31 | 1987-02-18 | ||
JPS62128153U (ja) * | 1986-02-06 | 1987-08-13 | ||
JPS62188542U (ja) * | 1986-05-23 | 1987-12-01 | ||
JPH0378952U (ja) * | 1989-12-06 | 1991-08-12 | ||
JPH0387857U (ja) * | 1989-12-22 | 1991-09-06 | ||
JPH0583348U (ja) * | 1992-04-13 | 1993-11-12 | æ ªåŒäŒç€Ÿäº¬æµç²Ÿæ©è£œäœæ | æ°ååšã«ããããžãšããããŒãã«æ¯æè£ çœ® |
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