JPS6198953A - Carburetor - Google Patents

Abstract

PURPOSE:To prevent a large amount of fuel from being delivered from a main nozzle due to centrifugal force or the like of a car when it converts the direction, by interposing a cut valve which limits the circulation of fuel when a throttle valve is closed or an accelerator pedal is not depressed. CONSTITUTION:A carburetor 1 provides a fuel cut valve 10 to be interposed between a float chamber 2 and a main jet 3. And the fuel cut valve 10, adjusting by moving a piston 13 the opening degree of a communication hole 12 drilled in a cylinder 11, limits a flow of fuel. While a movement of the piston 13 is controlled by a switch 15 interlocking to an accelerator pedal, and the carburetor, turning off the switch 15, for instance, when the accelerator pedal is released, protrudes the piston 13 by a spring in a driving part 14 to half open the communication hole 12. In this way, the carburetor prevents a large amount of fuel from its inflow to the main jet 3 due to centrifugal force or the like of a car when it converts the direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J This invention relates to a carburetor mounted on a vehicle, particularly an automobile.

``Prior Art'' When a car suddenly accelerates or decelerates, the gasoline in the float chamber of the carburetor receives a force from 7111. Also,
When changing direction, the gasoline in the float chamber is subjected to centrifugal force.

When the direction of such a force substantially coincides with the outflow direction of gasoline from the float chamber to the main jet, the force acts as a force (increasing force) that increases the output of gasoline ty3<.

However, when the throttle is narrowed down, such as when decelerating or changing direction, the increased force causes a large amount of gasoline to be discharged from the main nozzle even though there are few air meteors, resulting in an excessive air-fuel ratio. There is a problem that the engine becomes rich and the engine output decreases or the engine speed increases by 1!31.

In addition, Utility Model Application Publication No. 58-29143 was developed as a prior art that attempted to improve the problem of the carburetor being affected when a car turns 1☆.
There are various sounds of disclosure in Goko and g.

``Object of the Invention'' An object of the present invention is to provide a carburetor that prevents excessive flow of fuel from the float chamber into the main jet due to centrifugal force or the like when a vehicle changes direction.

“Structure of the Invention” The present invention provides a capurec mounted on a vehicle, etc.
A fuel cut valve that limits the flow of fuel to a predetermined flow rate when the throttle valve is closed or when the accelerator pedal is not pressed is installed in a part of the fuel flow path that communicates from the float chamber to the main nozzle via the main jet. It consists of four characteristics.

In the configuration described above, it is preferable that the operation of the fuel cut valve is linked to the opening and closing of the throttle valve, but since the opening and closing of the throttle valve is almost dependent on the operation of the accelerator pedal, it is also possible to operate the fuel cut valve in conjunction with the operation of the accelerator pedal. good.

In addition, "to mark the flow rate below a predetermined level" means that if the fuel that has passed through the fuel cut valve is to be supplied only to the main system from then on, the flow of fuel may be qualitatively restricted to 0. , this means that if one is to be supplied to the slow system, it should be restricted to low rotation speeds so that a predetermined flow M having a ν value can be distributed.

In addition, "vehicles, etc." refers to moving bodies such as own or other cities, ships, 1 row, 10 etc. This means that it is installed inside a vehicle etc. for the purpose of

"Examples" The present invention will be further explained in detail below based on the examples shown in the figures. Here, Fig. 1 is a schematic navy blue cross-sectional view of a carburetor according to one embodiment of the invention, Fig. 2 is a schematic vertical cross-sectional view of another embodiment, and Fig. 3 is a 412-type schematic cross-sectional view of yet another embodiment. Cross sectional view, No. 4 tll is A-A sectional view in Fig. 3, No. 5
The figure is a BB sectional view in No. 3 and 1. Note that this invention is not limited to this.

In the carburetor 1 shown in Fig. 1),
4 (?, l ii / ji y throat 3. +1 は 1 jll'ri・1. Main nozzle 5, henna 1. ri part 6. sr+-
Jiy, 7to7, idol bo! -8 and throttle valve 9 each have the same configuration as that of conventionally known carburetors.The difference from the conventional carburetor configuration is that a fuel cut valve 10 is interposed between the float chamber 2 and the main jet 3. The point is that it is.

This fuel car/tube valve lO is installed in the cylinder 11. ! ! The flow rate is restricted by adjusting the opening degree of the through hole 12 by moving the piston 13.

The shift j of '/l3 is controlled by a switch 15 that is turned on and off in conjunction with an accelerator pedal (not shown). That is, when the accelerator pedal is released, the switch 15 is off and the drive unit 1
The piston 13 communicates with the spring G,' in 41.4.
Is it possible to make 12 the best? (Dotted line in Figure 1)
゜“When you step on the accelerator pedal, the switch 15 turns on, and the solenoid in the I+ section 14 pulls the piston 13,
Communication hole 12 is fully open! (at I (1st ”71 solid line).

When the direction in which gasoline flows into the main nozzle 3 is as indicated by the arrow α shown in FIG.

(X from float chamber 2 to main sign node 3 &:I
Gasoline first flows in the direction of arrow β in Figure 1, flows into the ring, and then flows in the direction of arrow α.
＋、lrgﾛﾛC main gear y so that it flows into the main engine y soto 3i、When the accelerator pedal is depressed, the throttle valve 9 opens, and the solid line in Figure 1 (I becomes position 7)6:、When the accelerator pedal is released. The throttle valve 9 is closed 5, as shown by the broken line in FIG. 1 (1'/position 62).

Assuming that the cross section of Figure 1 coincides with the east plane extending in the left-right direction of the car, the carburetor l is the car υ = (assuming that it is considered old 7), and the inside of the car is the float p+'-
Considering the situation in which the main nozzle 5 (!) is inward and the main nozzle (!) is on the outside (1), the gasoline in the float 5 =, 2 is 1-7 in the direction of the arrow β in Figure 1. The force is +y, +ke, and this direction coincides with the direction α in which the gun flows into the main jet 3.

Second, if +a does not have a fuel cutoff valve lO, more than 1lll normal amount of gasoline will flow into the main jet 3 due to centrifugal force, and Henna j
Excess gasoline will be discharged from the main nozzle 5 relative to the air flow inside the pipe 6. When the throttle valve 9 is open, relatively air rl! Although there is no problem even if the gasoline discharge becomes excessively high because the throttle valve 9 is closed, if the gasoline discharge becomes excessively high, the air-fuel ratio will change because the air flow rate is extremely small. There is a risk that the engine will become significantly overrich, resulting in a drop in engine output or even stopping.

However, this invention 1. With such a carburetor, the fuel cuff (when the accelerator pedal is not depressed)
Since the valve 10 regulates the flow rate of gasoline, even if the centrifugal force decreases, a large amount of gasoline will not flow into the main ports y and 7. Therefore, the throttle valve 9 is closed (it is safe to assume that the throttle valve 9 is closed when the accelerator pedal is released) c! −
This will prevent all cases in which C4" gasoline is irradiated from the main nozzle 5. As a result, the air-fuel ratio will not be 10-bar rich, and the Ennon output will drop or stop. - When the accelerator pedal is depressed, the piston 13 is retracted and
Since the llTl hole 12 is fully open, no gasoline will flow.>
; It is possible to flow into the main pipe 3 without receiving 111X.

Since the hole 12 of the connecting hole 1 is provided with a nail v at a right angle to the outflow direction α of gasoline to the main y throat 3,
) As mentioned above, the gasoline flowing into the main jet 3 from i2 first flows in the arrow β direction 47 lA in FIG. The centrifugal gradient in the direction of the 1st arrow RH at A7 where it flows into the 1st arrow is this point.

For the flow of gasoline in the direction of arrow β perpendicular to , it acts as a force to increase the flow, and there is no force. Then, "1-Too-chamber 2
The flow of gasoline from the main area to the main area 3) is increased by centrifugal force, and the entire area is kept to a small size 4).

, 2, the negative effects of centrifugal force are caused by gasoline
The gap δ C flowing from the IT chamber 2 to the main jet 3
It can also be kept small by changing the flow direction for a day.

Next, the cross section in Figure 1 is i? This capretor L is mounted on its own axis F so that it coincides with the vertical plane extending in the force direction and the float chamber 2 is located at (q b°) than the main nozzle 5. ilj is σ
Considering the current situation, the gasoline in chamber 2 is 1! in the direction of arrow γ in Figure 1! 'Month! After receiving 1 power, this is 'l +ln alwaysjJ 'y)G's Gala 11n is gasoline main JG3t:? A:, people try. Therefore, if the fuel cut valve 10 is assumed to be old, there is a mistake 1q that results in over-richness. In the case of the second cuff letter 1, this problem does not occur due to the above-mentioned action of the cut valve 10.

No. 21214. The engine carburetor 21 is other than the one of this invention.

This is a two-barrel/fiber type having two barrels, a primary side barrel 22 and a secondary bolt barrel 23.Example 111 shown in No. 11'21! Example Ia) Carburetor The same is true for the L and H configurations, and a special notice number is attached to the condolence, and there is a ゛ (there is. However, between the secondary side configurations (
− is further appended with ′.

The point where this carburetor 21 has a carburetor valve 1 and W shown in 11th' is that a secondary fuel cut valve lO' is provided between the secondary float chamber 2' and the secondary/secondary side main jet 3'. The operation of the primary fuel cut valve IO and the secondary side fuel cut valve 10' is linked to the opening and closing of the primary (W11 stage) 1 knot valve 9 stones and the throttle valve 9'. As soon as it is controlled, it is.

That is, the primary side throttle valve 9 is closed L7.
・The fal ii + contact 25 opens, and the fuel ↑) force ・Tohalb 10 closes the connection 11rl hole 12 with the opening of ゛1 and releases gasoline 7i! i,? l;1111 til+! - J゛ru. Throttle valve 9 is I! 71 < 1 control t12
Point 25 closes 5, fuel power, ) valve! 0 (il+ in 1
(1 and 12 are fully opened.

-)4 On the secondary side, when throttle valve q' closes, contact 25' opens and fuel cut valve 10 closes.
12' leaves the communication hole 12' open and allows the flow of gasoline to the secondary fu, lI main page 3'.
I do. Secondary (separately, there is no slow system, so it is possible to cut off the flow of gasoline. When the throttle valve 9' opens, the control contact 25' closes, and the fuel cut valve lO' fully opens the communication hole 12'. 1.

Now, the 2112th! It is assumed that the carburetor 21 is mounted on the vehicle so that the cross section of the curve 1 coincides with a vertical plane extending in the left-right direction or [1;1 rearward direction] of the vehicle.

Then, when the car is cornering or decelerating,
The gasoline in the float chamber 2 may be subjected to a force in the direction of the arrow γ in FIG. 2, and the gasoline in the float chamber 2' may be subjected to a force in the direction of the arrow T' in FIG. These forces are the forces that increase the flow of gasoline to the main generator) 3.3', respectively, from Pl+ <, and if the fuel cut valve 1O210' is This may lead to However, with this carburetor 21, the throttle valves 9, 9'
When is closed, the fuel power is 10.10'
respectively limit or block the flow of gasoline;
From step 11-2, over-richness of the air-fuel ratio is prevented, and a decrease in engine output and a stoppage of the engine are prevented in either case.

The capretor 31 shown in FIGS. 3 to 5 is yet another embodiment of the present invention, and is of a two-barrel type and has a primary barrel 32 and a secondary barrel 33.

The gasoline in the float chamber 2 is connected to the primary (!Ill maino)ybut3 and the secondary metering main-/y7.
3', and is discharged from the primary main nozzle 5 and the secondary main nozzle 5' into the Hentury tubes 6, 6' of each barrel.

Float chamber 2 and primary 1111 main/1 engine I throat 3
A cylindrical cover tube 40 is interposed between the cover tube 40 and the cover tube 40 to be bent in the downward direction. i/l.

41 is pierced. It's a float '1
Gasoline flowing from the main jet 3 to the main jet 3 flows in the direction of the 1'1'1' arrow β and reaches the cover duplex 4.
After flowing into 0, change the flow in the direction of arrow α and enter May 7
) flows into the ybutton 3.

On the other hand, float chamber 2 and secondary main compartment 3
A fuel cut valve IO is interposed between '. The structure and operation of this fuel cut valve 10 are the same as those described for the carburetor 1 shown in FIG. In other words, when the accelerator pedal is not depressed, the piston 13 moves between the main jets 3' and 1i!, as shown by the two-dot chain line in FIG. When the accelerator pedal is pressed, the piston 1
3 is drawn into the drive unit 14, and the communication hole 12 is connected to the main jet 3'.

Now, the cross section in Fig. 3 coincides with the horizontal mi, and the secondary (11 barrel 33 is in the fIi+ forward direction during automatic operation from the primer barrel 32 (:, N/, j c,,
Further, assuming that this carburetor 31 is installed in front of the rear vehicle (not shown), when the self-driving force i1j rotates to the right, the inside of the float chamber 2 Gasoline is subjected to centrifugal force in the direction of the arrow γ shown in Figures 1 and 5.

Normally, the center of J-gyration is located at (extension line of the bag axle) -, so
In the secondary example in the float chamber 2, the gasoline in the primary chamber 2 is located at a distance X+ farther from the rotating IL than the gasoline in the primary chamber 1, and is subject to a stronger centrifugal force.

If the direction of the force due to centrifugal force matches the direction α of the engine flowing into the main generator 1-3.3', then the secondary (the rule is 2 t from the primary 1 ull)
Receive the power to increase the influx of gasoline.

When the accelerator pedal is depressed, the piston 13 connects to the III main node 3', which is secondary to the Q hole 12, as shown in Fig. 5.
Therefore, excessive gasoline does not flow into the main nozzle 3', and therefore excessive gasoline is prevented from being discharged from the main nozzle 5'. 3G, Nimo-F・
It's weaker than the Kanda measurement, but is it for gasoline? N. The power that increases people works.

However, 1. From float chamber 2 to main... +34
．． - Because of the Cahatchinobe 40, the inflowing gasoline must first change its flow in the α direction in Figure 4 and then in the α direction in Figure 4, but for the gasoline flow in the arrow β direction, the force in the arrow γ direction is does not act as a force that increases Therefore, the overall effect of increasing the flow of gasoline into the main joint throat 3 can be suppressed to a small level.

After all, this carburetor 31 prevents the engine from decreasing in output or stopping when the accelerator pedal is released and turned Mn to the right.

In addition, the primary barrel 32 is located in front of the vehicle compared to the secondary (P barrel 33), and
=W, if a carburetor of the same type as this carburetor 31 is mounted in front of the shaft, the primary side will be farther from the turning center than the secondary side, so the primary side will receive stronger centrifugal force. Therefore, in this case, it is preferable to provide a fuel cut valve on the primary side and sink a cover dupe on the secondary side.

Carburetor yourself! T! l] City (rearward C from the city)
1 = L town / When reaching adulthood, strong centrifugal force is applied to IL (1
Since 11 is 1- mark, install a fuel cut valve +1Ill and Cahachi! - The example of providing a block is the opposite of 1-.

'1p, the fuel cut valve is due to centrifugal force:! !・、
+7: Since it has a high ability to prevent K11, it is preferable to install it in the fuel flow path on the side that receives strong centrifugal force.

[Weak] If you are forced to use your full strength, the structure of hil-
Although it is not necessary to provide anything from the viewpoint of Q conversion, it is preferable to sink the cover tube from the viewpoint of preventing the adverse effects of long distance and force, and furthermore, it is recommended to provide a fuel cut valve. is preferred.

↑It is easy to get 1q of the same effect against zero sacrifice 4
: Will be understood.

"Effects of the Invention" According to the present invention, in a diesel engine that is used in vehicles, etc., the fuel flow path communicating from the float chamber to the main nozzle through the main nozzle -r:r+t:, throttle valve. Muni or Aqui when closed! Restricts the flow of fuel to a specified flow rate when the lever is not stepped on.Zeru 2
A carburetor is provided which is characterized by having a feed cut valve interposed therein, which prevents at least the throttle from flowing the furnace feed into the main jet and throat due to the action of centrifugal force when the vehicle changes direction. This can be prevented when the throttle is closed, causing excessive fuel to be discharged from the main nozzle even when the throttle is closed, causing an imbalance in the air-fuel ratio and resulting in a drop in engine output or engine shutdown.
It is important to prevent IF from inviting problems.

Furthermore, this invention can be applied to twin carburetors as well.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view of a capretor according to one embodiment of the present invention, and Fig. 2 is a schematic vertical cross-sectional view of another embodiment.
The figure is a schematic diagram of another embodiment 1.t! 4 is a sectional view taken along the line AA in FIG. 3, and 5th 1 is a sectional view taken along line P and -B in FIG. 3. (Explanation of symbols) 1.21.31...Cab 1/Evening 2.2'...Float chamber 3.3'...Main shed I-5,5'...Main nozzle 8...Idle boat 9... Throttle valve 10
．． 10'...Fuel cut valve 11...Frinzo 12.12'...Communication hole 13.13'...Piston 22...Flyer Isu Harel 23...Secanta Shimotsuki! Reharel 40...Cover duplex I1-...iii J
Hole α... Direction of flow into main shed β... To fringe or cover cube 1? fi included 5
! Direction T: Direction of action of centrifugal force.

Claims (1)

[Claims] 1. In a carburetor installed in a vehicle, a part of the fuel flow path that communicates from the float chamber to the main nozzle via the main jet is filled with fuel when the throttle valve is closed or when the accelerator pedal is not depressed. A fuel cut valve is installed to limit the flow to a predetermined flow rate or less, and due to centrifugal force when the vehicle changes direction, a large amount of fuel is discharged from the main nozzle even though the throttle is closed. A carburetor characterized by preventing 2. The carburetor according to claim 1, wherein the fuel cut valve is installed at a fuel outlet to the main jet that is opened in the wall of the float chamber. 3. The carburetor according to claim 1 or 2, wherein the fuel cut valve is an electromagnetic valve.