JPS588256A - Power device of carburretor - Google Patents

Abstract

PURPOSE:To automatically adjust the amount of additional fuel according to temperature by making one of the plural number of coil shaped springs for controlling the make and break action of a power valve from a shape storing alloy. CONSTITUTION:A power valve 4 having a pedestal 1, a conical valve body 2 and a valve spring 3 is provided inside a float chamber 5, and on its upper side a negative pressure chamber 6 and a piston chamber 7 are arranged. And an actuating lever 8 protruded downward from a piston 7 is inserted into the float chamber 5 to actuate an actuating spring 9. Here, the valve spring 3 is made from a shape storing alloy, and is processed so as to provide the shorter coil length at low temperature. Hereby, the valve spring 3 causes, at low temperature, the power valve 4 to be closed even if it does not produce valve closing force, and it causes, at high temperature, the power valve 4 to be closed to permit the amount of additional fuel to be restricted because it produces valve closing force, thus allowing high efficiency operation to be provided coverting the range from low temperature to high temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carburetor power device that can automatically adjust the amount of additional fuel supplied when the engine is at high load or full load.

A power device that supplies additional fuel to obtain an output mixture ratio when the engine is under high load or full load is constructed so that the power valve is opened by the intake negative pressure of the engine or by the throttle valve. Currently, electronically controlled carburetors are often used that adjust the fuel supplied from the main system and the low speed system depending on the situation, and also accelerate.

What about adjusting the mixture ratio to an appropriate level during deceleration and other operations, countering exhaust gas emissions, and stabilizing engine operation? Although many methods have been proposed for measuring fuel consumption, there is no suitable fuel adjustment method for power equipment. However, even at high load or full load, the additional fuel is adjusted according to temperature changes, and the output mixture ratio is controlled to be less at high temperatures and more at low temperatures, so that stable output performance can be obtained without variation due to temperature. It is clear that this is desirable.

The present invention is made of a shape memory alloy, which is one of the plurality of coiled springs that are installed in the power device and controls the opening and closing of the power valve, thereby eliminating the need for special processing or the addition of special parts. The additional fuel is automatically adjusted by adjusting the opening of the power valve according to temperature changes.

Materials with a shape memory effect, that is, shape memory alloys, are known as materials that reversibly change shape with changes in temperature due to thermoelastic martensitic transformation.
-Ti, Cu-AJ-Ni, Cts-Zn-AI-
Ni #Fe-Ni, N1=Aj eNb-T i
, Cu-Zn-8n, Cu-Zn-Aj, Co
-Zn, Cu-8n tFe-Pt +Fe-Be
+Fe-Mn, In-Ta 5Au-Cd mAl-
Alloys such as Zn are said to be materials having the shape memory effect tf. When these alloys are heat-treated at a temperature higher than the reverse transformation end temperature Af to memorize the original shape, the @ degree decreases and martensitic transformation begins.When it becomes lower than i[Ms, deformation begins and martensitic transformation End temperature Mf
The deformation stops when . When the temperature rises and becomes higher than the reverse transformation start temperature As, it starts deforming again and returns to its original shape when it reaches the reverse transformation end temperature Af (see Figure 1).
.

Therefore, the original shape? By processing and deforming the material into a desired shape at a temperature lower than the memorized material IMf, the shape reversibly changes between the original shape and the deformed shape within the transition temperature range. When made from a coiled spring shape memory alloy.

When it is compressed at a lower degree than the memorized original shape IMf and deformed so that the coil length becomes shorter.

This spring expands as the temperature rises and contracts as the temperature drops. On the other hand, when the coil is deformed by stretching to increase the length of the coil, the springs contract as the temperature rises and expand as the temperature falls. Moreover, the force generated during stretching is strong, and a large load can be applied.

The second factor is the minimum TL and maximum TIH of the dislocation accuracy of a coiled spring made of a shape memory alloy, and the temperature T1. It is a characteristic curve diagram showing the relationship between the amount of deformation and the load at Tz and Ts.

In the high temperature region, the amount of deformation is very small (Figure a).
, is the deformation large enough for the spring to be practically effective only in a limited low temperature range? It turns out that it only lasts. Must! According to
When a bias spring made of a metal material that does not have a shape memory effect is applied oppositely to this spring, the spring will move along the line S.
The amount of deformation is b and the deformation is of a practically effective magnitude in the area b. Initial load or bending characteristics of bias spring? When changing, the deformation occurs along a line parallel to @S.

In addition, as is clear from Figure 11!1, the temperature at which the same amount of deformation is reached is different between when the temperature is raised and when the temperature is lowered during @transformation. Bias helps reduce the difference due to hysteresis. In addition, K acts on the bias spring so that it applies a load and performs controlled displacement in response to the expansion and contraction of the spring due to temperature changes.

In the carburetor power device according to the present invention, the valve body is pressed against the valve seat by springing off. Do you have a pa′? -Valve and engine
・Equipped with an operating rod protruding from the piston that is operated by negative suction pressure, or an operating rod linked to the throttle valve of the carburetor through a link mechanism.The two operating rods have an operation that pushes the valve body to open the valve. A spring or damper spring acts. In areas where suction negative pressure is low at high or full loads, the piston and operating rod operate to open the valve body by the force of the operating spring, or in areas where the throttle valve opening is large, the operating rod operates by a link mechanism. Operates to open the valve body.

According to the invention, firstly the valve spring and the actuating spring.

One of the damper springs is made of a shape memory alloy, and the other is made of a normal material that does not have a shape memory effect.

With this, it is possible to set the power valve to the maximum opening degree at low temperatures, or to keep it open all the time, and to gradually reduce the opening degree as the temperature rises, and in some cases prevent the power valve from opening at high temperatures. Secondly, a control spring made of a shape memory alloy is additionally provided to the valve spring 2 actuation spring made of conventional materials and the damper spring. Accordingly, the same control as described above can be performed. Third, an additional bias spring made of conventional material is provided. This controls the amount of displacement of the spring made of shape memory alloy.
Of course, existing springs made of ordinary materials may also function as bias springs.

The purpose of the present invention is to adjust the amount of additional fuel at high load to full load depending on the temperature, that is, the temperature of the atmosphere or the engine, as stated in the beginning of RK, and for this purpose, the thermoelasticity of the material having a shape memory effect is The opening of the power valve is adjusted according to Ikga[k by utilizing the phase dislocation phenomenon caused by martensitic transformation, and the spring made of shape memory alloy is used between temperatures below Mf and above Af. In addition, it may be used in an appropriate temperature range between Mf and Af.

As described above, according to the present invention, one of the plurality of springs that controls the opening and closing of the power valve is made of a shape memory alloy, so that the additional amount of fuel supplied by passing through the power valve can be controlled manually. Of course, stable output performance can be obtained by physically adjusting the temperature according to the temperature without adding any special machining or complicated parts, and the same power valve as conventional power valves at room temperature. It is possible to control the opening and closing of the door. Also.

In addition to adjusting the opening of the power valve, it is also possible to keep the power valve open at extremely low temperatures to allow refueling in the normal operating range, or to forcibly close the power valve at extremely high temperatures. It is also possible to provide functions such as not supplying additional fuel, and it is possible to perform functions that exceed those of conventional power valves.

Furthermore, coiled springs made from shape memory alloys have the advantage of having a greater length change due to temperature changes than bimetals whose shape changes with heat, and are highly reliable in operation. It can be installed and controlled precisely by simply replacing it or without requiring a large space.

Next, the drawings showing the embodiments of the present invention will be described.

In each example, a coiled spring treated at a temperature higher than Mf and memorized in its original shape + 1 stretched and deformed at a temperature lower than Mf (2), or a coiled spring processed at a temperature lower than Mf Either one (7) that has been compressed and processed is used.

[Embodiment 1] (Fig. 3) Valve seat 11 Conical or needle-shaped valve body 2. A power valve 4 having a valve spring 3 is provided inside a float chamber 5, and a negative pressure chamber 6 into which suction negative pressure is introduced and a piston 7 are arranged above the power valve 4.
A downward operating rod 8 protruding from the piston 7 is inserted into the float chamber 5, and an operating spring 9 acts on this operating rod 8. When the suction negative pressure becomes low, the piston 7 moves under the action of the operating spring 9. The actuating rod 8 is pushed down by force and pushes the valve body 2 away from the valve seat l. Fuel flowing through the gap between the valve seat 1 and the valve body 2 passes through the power jet and joins the main system.

The coil-shaped valve spring 3 that presses the two valve bodies against the valve seat l is made of Y, and the coil-shaped crop spring 9 that pushes the valve body 2 to open the valve is made of ordinary material, and the valve spring 3 presses against the valve seat l when the valve body is cold. 3 either keeps the power valve 4 open at all times without generating any valve closing force, or generates a small valve closing force and causes the valve body 2 to open to its maximum opening degree using the operating spring 9. When the temperature is high, the valve spring 3 completely closes the valve body 2 and prevents the valve body 2 from opening by the actuating spring 9, or keeps the valve opening to a small degree.

In this embodiment, the valve spring 3 may be made of conventional materials and the actuating spring 9 may be used. In this case, when the temperature is low, the piston 7 is pushed down more than usual, and the opening of the power valve 4 becomes large.59 On the other hand, when the temperature is high, the operating spring 9 contracts, so the opening of the power valve 4 is reduced or is not opened. .

[Embodiment 2] (Fig. 4) In the same negative pressure type power device as in Embodiment 1, the piston 7 is operated in the direction of E to resist the operation force 91'CJ and limit the opening of the power valve 4. The control is caused by the action of spring IO. The control spring lO is made of Y, and the valve spring 3 and actuation spring 9 are made of conventional materials. Low mad < control spring lO will contract and will not hinder the opening of the power valve 4, but
When the temperature is high, the operating spring 9 prevents or limits the operation of the operating rod 8, so that the power ax 4Ik does not open or is kept at a small opening. It's the lid.

In this embodiment, the actuating spring 9 acts as a bias spring for the control spring 1O and controls the displacement of the actuating rod 8 at low to normal temperatures.

[Example 3] (''Figure 5) In the negative formal power device il of Example 1.

A control spring 11 acts on the piston 7 in a downward direction. The control spring 11, which is built in the true chamber 6 and acts in the direction of opening the power valve 4 against the valve spring 3, is made of a conventional material, and the rabbit spring 3 and the operating spring 9 are made of ordinary materials. There is. When the temperature is low, the control spring 11 expands and the piston 7
The power valve 4 is opened even in an operating region where the suction negative pressure is high. As the temperature rises, the control spring l'l contracts and gradually acts on the binuto 77, and stops acting on it, reducing the power to 9P.
4 is operated to open the valve in the same manner as in the conventional case.6 The control levers 10 and 11 used in Example 2.3 are operated by operating rods 8 and 8 in place of the piston 7. The same is true when acting on the valve body 2, and when this control spring 10.11 is effectively acting, the valve spring 3 and the actuating spring 9 are balanced and the opening of the power valve 4 is delayed. This inconvenience will be eliminated. Furthermore, in a single mechanical type power device, the above-mentioned operating spring is only replaced by a damper spring, and the function is exactly the same as that of a negative pressure type.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the characteristics of shape memory alloys, Figures 3 and 4, and I! FIG. 5 is a vertical sectional view showing different embodiments of the present invention. 2... Valve body, 3... Valve spring, 4...
...Power valve, 8...Operating rod, 9...
- Operating spring, 10.11... Control spring. Agent Mutsuaki Nozawa

Claims (1)

[Claims] (11) A power device for a carburetor characterized in that one of the plurality of coiled springs for controlling the opening and closing of the power valve is made of a shape memory alloy. The ax spring that acts in the direction of closing the valve is made of a shape memory alloy and is processed and deformed at low temperatures so that the coil length becomes shorter, and the power valve acts in the direction of opening the valve. The device according to claim 11, wherein the spring (or damper spring) is made of a material that does not have a shape memory effect. (3) The valve spring acting in the direction of closing the power valve has a shape memory effect. The actuating spring (or damper spring) that acts in the direction of opening the power valve is made of a shape memory alloy and is processed and deformed at low temperatures so that the coil length becomes longer. (4) A valve spring acting in a direction to close a power valve and an operating spring (or damper spring) acting in a direction to open a power valve. The control spring that limits the opening of the power valve against the 0 actuation spring (or damper spring) is 9fX. The valve spring and the actuation spring (or damper spring) are made of materials that do not have a shape memory effect. and the control spring is made of a shape memory alloy and is processed and deformed so that the coil length is shortened at low temperature. a valve spring acting in the direction of the power valve, an actuating spring (or damper spring) acting in the direction of opening the valve, and a control spring acting against the valve spring in the direction of opening the power valve; A patent in which the spring and actuating spring (or damper spring) are made of a material that does not have a shape memory effect, and the control spring is made of a shape memory alloy and is processed and deformed at low temperatures to increase the coil length. Claims (A device according to claim 11.