CN101886588A - Idle adjusting device of motorcycle carburetor - Google Patents

Abstract

The invention relates to an idle adjusting device of a motorcycle carburetor. An idle orifice in the carburetor body is chambered into a step hole; the step hole is fixed with an idle nozzle; a through hole composed of a front-end hole, a middle-end hole and a rear-end hole is formed in the idle nozzle with a step-like shape, and the diameter of the middle-end hole is smaller than that of the front-end hole and the rear sector hole; a ledge of the idle nozzle is pressed on the ledge of the step hole; a length of the rear end of the idle nozzle stretches into a mixing chamber; a front cone of an idle adjusting screw on the carburetor body stretches into the middle-end hole of the idle nozzle; and the diameter of the bottom of the front cone of the idle adjusting screw is larger than that of the middle-end hole of the idle nozzle. The idle nozzle extends out of the hole wall of the mixing chamber of the carburetor, thus a mixing air wall flow is avoided, the nebulizing effect of the mixing air is better and the combustion of the mixing air is more sufficient; at the same time, the invention has the characteristics of large oil injection regulation range, precise control and convenient operation.

Description

Idle adjusting device of motorcycle carburetor

Technical field

The present invention relates to motorcycle carburetor, particularly idle adjusting device of motorcycle carburetor in the oil spout mode of control idle fuel way, improves motorcycle engine idle function.

Background technique

At present along with the raising of emission regulation demands, the problem that motorcycle carburetor mainly exists is that startability, transitionality, acceleration are bad, is the problem that the motorcycle carburetor technology is not resolved.Because the idling oil spout mode of present motorcycle carburetor is directly to be sprayed by Carburetor mixing chamber hole wall, be easy to generate wall stream, thereby make the mixed gas atomizing bad, directly have influence on startability, transitionality, acceleration and the discharging of motorcycle.According to national policy and motorcycle technology demand for development, the motorcycle emission index should reach industry standard, so, for solving the defective that above-mentioned motorcycle carburetor exists, each motorcycle producer has only and adopts electric jet technology satisfying the requirement of following discharging, a large amount of like this increases cost; On the other hand, along with the difference of engine model, motorcycle producer will develop different motorcycle electric spraying systems, and development cost increase like this; The motorcycle price will will rise simultaneously, and sales force will descend.

Summary of the invention

The purpose of this invention is to provide a kind of to improve idling oil spout mode, the idle adjusting device of motorcycle carburetor of raising mixed gas atomizing effect.

The object of the present invention is achieved like this: a kind of idle adjusting device of motorcycle carburetor, comprise the Carburetor body, intrinsic idle fuel way of Carburetor and idler nozzle, the intrinsic idler nozzle of Carburetor is a step hole through reaming, be fixed with idling jet on this step hole: profile is to have one by preceding sector hole along its axis in the idling jet of stepped shape, the through hole that middle sector hole and back sector hole are formed, and the diameter of middle sector hole is less than the diameter of preceding sector hole and the diameter of back sector hole, the shoulder of idling jet rides on the shoulder of step hole, and a segment length H in the mixing chamber is stretched into after stretching out the Carburetor body in the rear end of idling jet; Idle adjusting screw is arranged on the Carburetor body, and in the sector hole, the base diameter of the anterior cone of idle adjusting screw is greater than the diameter of the middle sector hole of idling jet from the preceding sector hole of idling jet stretches to for the anterior cone of idle adjusting screw.

Above-mentioned idling jet riveted fixing is on the intrinsic step hole of Carburetor.

Stage casing bore dia in the above-mentioned idling jet is 0.8 ± 0.01mm; H is 3～5mm.

The present invention is directed to the problem and shortage that existing motorcycle carburetor idling oil spout technology exists in startability, transitionality, acceleration and discharging, improve invention and be applicable to 50CC～750CC different model idle adjusting device of motorcycle carburetor, improve motorcycle engine startability, transitionality, acceleration, reduce motorcycle emission and pollute, improve the motorcycle carburetor quality of product.

The present invention compares with existing Carburetor, and the beneficial effect of generation is:

1, the present invention increases the Carburetor idling jet on the motorcycle carburetor idler nozzle, the spray orifice of Carburetor idling jet stretches out Carburetor mixing chamber hole wall, thereby avoid the miscarriage of mixed gas wall to give birth to, it is more abundant that mixed gas is mixed, atomizing effect is better, and it is more abundant to burn, thereby improves motorcycle startability, transitionality, acceleration, reduce the motorcycle emission pollution, improved the motorcycle carburetor quality of product.

2, adopt the taper idle adjusting screw to cooperate the adjusting that realizes the oil spout flow, have the advantage that the oil spout regulation range is big, control is accurate, adjusting is easy to operate with the middle sector hole of idling jet.Concrete data are referring to the last various contrast experiments of specification.

Description of drawings

Fig. 1 is the structural drawing of existing Carburetor nozzle opening;

Fig. 2 is the structural drawing of idling jet of the present invention;

Fig. 3-the 1st, R/L CO constant speed emissions profile;

Fig. 3-the 2nd, R/L constant-speed fuel economy plotted curve;

Fig. 3-the 3rd, the full load power plotted curve;

Fig. 3-the 4th, the full load emissions profile;

Fig. 3-the 5th, the starting acceleration graph;

Fig. 3-the 6th surmounts acceleration graph;

Fig. 3-the 7th, idling speed curve of cyclical fluctuations figure;

Fig. 3-the 8th, idling speed stability line figure.

Embodiment

Fig. 2 illustrates, the present invention includes Carburetor body 1, intrinsic idle fuel way 4 of Carburetor and idler nozzle, idler nozzle in the Carburetor body 1 is a step hole 1a through reaming, be fixed with idling jet 2 on this step hole: profile is to have one by preceding sector hole 2a along its axis in the idling jet of stepped shape, the through hole that middle sector hole 2b and back sector hole 2c form, and the diameter of middle sector hole 2b is less than the diameter of preceding sector hole and the diameter of back sector hole, the shoulder of idling jet rides on the shoulder of step hole 1a, and a segment length H in the mixing chamber 5 is stretched into after stretching out Carburetor body 1 in the rear end of idling jet; Idle adjusting screw 3 is arranged on the Carburetor body 1, in the sector hole 2b, the base diameter of the anterior cone of idle adjusting screw is greater than the diameter (referring to Fig. 2) of the middle sector hole 2b of idling jet from the preceding sector hole 2a of idling jet stretches to for the anterior cone of idle adjusting screw 3.On the step hole 1a of idling jet 2 riveted fixing in Carburetor body 1.

Middle sector hole 2b diameter in the idling jet is 0.8 ± 0.01mm, and H is 4mm (corresponding model 125CC).

Below 50CC～100CC, H=3mm; 100CC above (containing 100CC) to 500CC, H=4mm; 500CC (containing 500cc) is to 750CC, H=5mm; ∮ D value can be determined according to the different model motorcycle carburetor

Fig. 1 illustrates, original idler nozzle on the Carburetor body 1 is enlarged, riveted joint Carburetor idling jet 2 on the idler nozzle that enlarges, Carburetor idling jet 2 profiles adopt the step design, adopt the riveted joint mode to be fixed on the Carburetor body 1, the length H that idling jet stretches out body decides according to the motorcycle carburetor of different model.Idling oil spout by through hole on the Carburetor idling jet 2 is by idle adjusting screw 3 manual tune, the middle sector hole that screws in or screw out through hole is ∮ D hole, with change oil spout runner cross-sectional sizes, thereby regulates the oil spout flow, final fuel injection sprays into mixing chamber 5, control engine idle speed stability.The engine and carburetor of motorcycle mixed gas enters Carburetor idling jet 2 by idle fuel way 4, by 2 ejections of Carburetor idling jet, avoid the miscarriage of mixed gas wall to give birth to, make the mixed gas materialization more abundant, improve engine startability, transitionality, acceleration, reduce motorcycle emission and pollute.

Engineering process of the present invention is: Fig. 1 illustrates, during the work of Carburetor idle fuel way, mixed gas is sprayed by Carburetor idling jet 2 apertures, the concentration of mixed gas is by the ∮ D hole (middle sector hole 2b) on the Carburetor idling jet 2, by idle adjusting screw 3 manual tune, control engine idle mixture strength is improved the engine idle speed stability.

Embodiment:

The 125CC motorcycle carburetor is adopted in this experiment, and the H value of 1# and improvement back 2#-3# Carburetor is 4mm before improving, and ∮ D value is 0.8 ± 0.01mm.

The experiment catalogue:

One, simulated roadway constant speed test (R/L) ... P2

Two, full load test (WOT) ... P3

Three, start to walk, surmount test (performance surely) ... P4

Four, starting test ... P5

Five, idle stability test ... P6

Six, road is ridden sense ... P7

Seven, state's three operating mode emission testings ... P8

Eight, Carburetor improves explanation ... P9

One, simulated roadway constant speed test (R/L):

1, constant speed discharging: Fig. 3-1

Conclusion: the Carburetor oil discharge amount after the improvement is few.

R/L constant-speed fuel economy: Fig. 3-2

Conclusion: the Carburetor oil after the improvement slightly descends.

Full load test (WOT)

Fig. 3-3: trailing wheel power:

Fig. 3-4: full load discharging

Start to walk, surmount test (performance surely)

Fig. 3-5: starting is quickened

Fig. 3-6: surmount acceleration curve

Fig. 3-5, Fig. 3-6 conclusions: the Carburetor starting after the improvement is quickened and surmounts to quicken to be better than improving preceding Carburetor.

Starting test:

Testing installation: milky way environmental laboratory

Motorcycle carries out starting test the indoor constant temperature of environmental experiment 8 hours, and gathers the starting process parameter.

Conclusion: the Carburetor after the improvement, the idling fuel-oil atmozation is good, and starting performance is improved and is improved a lot.

Idle stability:

Fig. 3-7: the idling speed curve of cyclical fluctuations

Test temperature: behind the starting motorcycle, idling 5min begins rotating speed of 30 seconds records, writes down altogether 10 minutes.

Time (min)	??0.0	??0.5	??1.0	??1.5	??2.0	??2.5	??3.0	??3.5	??4.0	??4.5	??5.0
												Carburetor before 1#-improves	??1440	??1478	??1500	??1486	??1520	??1545	??1496	??1380	??1386	??1480	??1540
2#-improves the back Carburetor	??1450	??1450	??1455	??1456	??1438	??1460	??1456	??1434	??1462	??1446	??1440
												Time (min)	??5.5	??6.0	??6.5	??7.0	??7.5	??8.0	??8.5	??9.0	??9.5	??10.0	??10.5
Carburetor before 1#-improves	??1585	??1600	??1590	??1470	??1422	??1490	??1581	??1580	??1512	??1598	??1573
												2#-improves the back Carburetor	??1460	??1470	??1445	??1468	??1470	??1448	??1472	??1469	??1449	??1469	??1461

Fig. 3-8 conclusion: the Carburetor after the improvement, idling speed stability are in ± 50rpm, and be better than the Carburetor idle stability before improving.

Road is ridden sense

Ambient temperature: 24 degree

Conclusion: the Carburetor after the improvement, it is better than the Carburetor before improving to become car to ride sense.

Claims (3)

1. idle adjusting device of motorcycle carburetor, comprise, Carburetor body (1), intrinsic idle fuel way of Carburetor (4) and idler nozzle, it is characterized in that: the idler nozzle in the described Carburetor body (1) is a step hole (1a) through reaming, be fixed with idling jet (2) on this step hole: profile is to have one by preceding sector hole (2a) along its axis in the idling jet of stepped shape, the through hole that middle sector hole (2b) and back sector hole (2c) are formed, and the diameter of middle sector hole (2b) is less than the diameter of preceding sector hole and the diameter of back sector hole, the shoulder of idling jet rides on the shoulder of step hole (1a), and a segment length H in the mixing chamber (5) is stretched into after stretching out Carburetor body (1) in the rear end of idling jet; Idle adjusting screw (3) is arranged on the Carburetor body (1), in the sector hole (2b), the base diameter of the anterior cone of idle adjusting screw is greater than the diameter of the middle sector hole (2b) of idling jet from the preceding sector hole (2a) of idling jet stretches to for the anterior cone of idle adjusting screw (3).

2. according to the described idle adjusting device of motorcycle carburetor of claim 1, it is characterized in that: on the step hole (1a) of described idling jet (2) riveted fixing in Carburetor body (1).

3. according to claim 1 or 2 described idle adjusting device of motorcycle carburetor, it is characterized in that: middle sector hole (2b) diameter in the described idling jet is 0.8 ± 0.01mm; H is 4mm.

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