JPH0329577Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuel vaporization auxiliary device for an internal combustion engine that atomizes liquefied fuel within an intake pipe.

[Prior Art] Vaporized fuel and combustion air supplied by a fuel supply means such as a carburetor or a fuel injection device are supplied to a combustion chamber of an internal combustion engine via an intake pipe. When this vaporized fuel mixed air passes through the intake pipe, a portion of the vaporized fuel collides with the inner wall of the intake pipe and becomes liquefied, especially at low temperatures.

For this reason, conventionally, the intake pipe is heated with engine cooling water to vaporize the liquefied fuel, or an electric heater is built into the intake pipe and the electric heater generates heat to vaporize the liquefied fuel. It has been devised.

[Problems to be solved by the invention] However, in the above-mentioned engine cooling water that heats the intake pipe, the weight of the vehicle increases because the cooling water is drawn into the intake pipe, and the temperature of the cooling water increases when the engine is started. The problem was that the intake pipe could not be heated because of the low temperature.

In addition, those in which an electric heater is incorporated into the intake pipe have a problem in that the electric heater consumes a large amount of current, which accelerates the deterioration of the vehicle battery.

Furthermore, both of the above-described methods of heating the intake pipe have the problem that the intake air is expanded and the amount of combustion air filling the engine fuel chamber is reduced because the intake air is heated.

Therefore, it has been proposed to arrange an ultrasonic vibrator at a bend in the intake pipe, for example. This ultrasonic vibrator vibrates at ultra high speed with a small current, and atomizes the liquid that comes into contact with the ultrasonic vibrator. However, since conventional ultrasonic vibrators are only supported inside the bends in the intake pipe, their only function is to atomize the fuel that would otherwise be liquefied by colliding with the bends in the intake pipes by colliding with the ultrasonic vibrators. However, there was a problem in that the liquefied fuel traveling along the inner wall of the intake pipe could not be atomized.

This invention was made in view of the above circumstances,
The purpose is to provide a fuel vaporization auxiliary device for an internal combustion engine that can atomize liquefied fuel traveling in an intake pipe.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes an ultrasonic vibrating body and a vibrating body support member that supports the ultrasonic vibrating body while being disposed in the intake pipe. In the fuel vaporization auxiliary device for an internal combustion engine, the vibrating body support member includes a collecting section that collects fuel traveling along the inner wall of the intake pipe, and a supply section that guides the fuel collected in the collecting section to the ultrasonic vibrating body. It is a technical means to have the following.

[Operation] Fuel traveling along the inner wall of the intake pipe on the upstream side of the collection section is collected by the collection section. The fuel collected in the collecting section is guided to the ultrasonic vibrator by the supply section, and is atomized by the ultrasonic vibrator.

[Effects of the invention] That is, the fuel traveling along the inner wall of the intake pipe on the upstream side of the collection portion can be atomized.

[Embodiment] Next, a fuel vaporization assisting device for an internal combustion engine according to the present invention will be described based on an embodiment shown in the drawings.

FIG. 3 shows a cross-sectional view of the vicinity of the cylinder of an automobile gasoline engine, including the intake system.

The engine 1 of this embodiment is of a single point injector type in which fuel is supplied to a plurality of combustion chambers 3 from one injector 2 serving as a fuel supply means. The intake pipe 4 includes an upstream intake pipe 6 including an injector 2 and a throttle valve 5;
It consists of a downstream intake pipe 7 that supplies fuel mixed air supplied from the upstream intake pipe 6 to a plurality of combustion chambers 3. The downstream intake pipe 7 is a manifold consisting of a single pipe 8 connected to the upstream intake pipe 6 and a plurality of pipes 9 connected to each of the plurality of fuel chambers 3.

Further, the injector 2 of this embodiment is a downdraft pipe that injects fuel downward, and in order to supply the fuel mixed air injected downward to the intake port 10 formed in the horizontal direction of the engine 1,
The downstream intake pipe 7 is bent at a substantially right angle at a branch path 11 from a single pipe 8 to a plurality of pipes 9.

A fuel vaporization auxiliary device 12 according to the present invention is attached between the upstream intake pipe 6 and the downstream intake pipe 7 with a plurality of bolts 13 and nuts 14.

As shown in FIGS. 1 and 2, this fuel vaporization auxiliary device 12 includes an ultrasonic vibrating body 15 that atomizes liquefied fuel by ultrasonic vibration, and a vibration surface of the ultrasonic vibrating body 15 facing upward. facing, and the ultrasonic vibrating body 15 is connected to a branch path 11 from a single tube 8 to a plurality of tubes 9.
The ultrasonic vibrator 15 is connected to the branch path 1 so as not to block the
1, and a vibrating body support member 16 disposed at 1.

The ultrasonic vibrating body 15 includes a piezoelectric element 17 that is displaced when a voltage is applied, and a ring-shaped rubber that is disposed between the piezoelectric element 17 and a vibrating body support member 16 and supported by the piezoelectric element 17 so that it can vibrate. member 18 and a ring-shaped first
It includes an electrode 19, a second electrode 20 provided on the entire lower surface of the piezoelectric element 17, and a plate spring current conducting body 21 formed so as to be in constant contact with the second electrode 20.

The vibrating body support member 16 includes a flange portion 22 sandwiched between the upstream intake pipe 6 and the downstream intake pipe 7, two struts 23 and 24 that guide the ultrasonic vibrating body 15 to the branch path 11, and It consists of a dish portion 25 that supports the vibrating body 15 within the branch path 11. In this embodiment, as shown in the drawings, the ultrasonic vibrator 15 is provided parallel to the flange portion 22, but it may be provided with an appropriate inclination depending on the shape of the intake pipe 4.

A groove 26 is formed on the inner periphery of the flange portion 22, which is a collection portion of the present invention that collects the liquefied fuel that is transmitted to the inner wall of the upstream intake pipe 6. This groove 26 is
It is formed around the entire circumference of the intake pipe 4, and is provided at an angle at the support portion of one of the pillars 23 so that the fuel can flow.

Further, a lead wire 2 is provided on the side surface of the flange portion 22.
The first electrode 19 and the plate spring current carrying body 2 via 7 and 28
A male connector 31 is provided with electrodes 29, 30 connected to the lead wire 2.
7 and 28 are arranged within the other support column 24 and within the flange portion 22. Moreover, the male connector 31 is
It is connected to a female connector 33 which is connected via a lead wire 32 to an ultrasonic generator (not shown).

A tube 34, which is the supply section of the present invention, is provided in one of the pillars 23. The tube 34 is provided so that its upper end opens into the groove 26 and its lower end opens onto the upper surface of the ultrasonic vibrator 15.

Next, the operation of this embodiment as described above will be explained.

When the piston 35 of the engine 1 descends, the intake valve 36 opens, and combustion occurs through an air filter (not shown) provided upstream of the upstream intake pipe 6, the upstream intake pipe 6, the downstream intake pipe 7, and the intake port 10. Fuel air is drawn into the chamber 3. At this time, the injector 2 injects gasoline in a mist form. As a result, the atomized gasoline flows into the combustion chamber 3 together with the air flowing through the intake pipe 4.

At this time, a part of the atomized gasoline injected from the injector 2 collides with the wall surface of the intake pipe 4 due to the injection angle of the injector 2, unevenness in the intake pipe 4, bending of the intake pipe, etc., and liquefies the intake air. The air flows through the inner wall of the intake pipe 4 due to the gravitational force.
Fuel that is liquefied upstream of the flange portion 22 and transmitted along the inner wall of the upstream intake pipe 6 flows into the groove 26 . Groove 2
The fuel that has flowed into the tube 6 is collected at the support portion of one of the struts 23 by the slope of the groove 26, and then flows into the tube 34. The fuel guided into the tube 34 passes through the tube 34 and is guided to the upper surface of the ultrasonic vibrating body 15, where it is given ultrasonic vibration by the piezoelectric element 17. Then, the gasoline subjected to the ultrasonic vibrations is scattered in the form of fine droplets above the piezoelectric element 17 and flows into the combustion chamber 3 along with the airflow flowing through the intake pipe 4 .

Furthermore, when passing through the branching path 11, the material that would have collided with the inner wall of the lower surface of the branching path 11 and liquefied in the past collided with the upper surface of the ultrasonic vibrator 15 of the fuel vaporization auxiliary device 12, causing the above-mentioned Similarly, ultrasonic vibrations are applied by the piezoelectric element 17, and the particles become fine droplets in the form of mist that flow into the combustion chamber 3 on the airflow flowing through the intake pipe 4.

This allows gasoline, which has conventionally been liquefied, to be atomized and supplied to the combustion chamber 3, thereby improving combustion efficiency.

Furthermore, compared to conventional systems in which the intake pipe is heated with cooling water, it is possible to prevent an increase in vehicle weight, and it is also possible to atomize gasoline that liquefies even when the engine is started.

Furthermore, compared to conventional systems that heat the intake pipe with an electric heater, less current is required.

Furthermore, since the intake pipe is not heated, the filling efficiency of air supplied into the combustion chamber can be increased.

Furthermore, the present invention allows the fuel vaporization auxiliary device 12 to be installed in the intake pipe 4 by simply installing the flange portion 22 between the upstream intake pipe 6 and the downstream intake pipe 7, which is different from the conventional method. The present invention can be implemented at low cost without modifying the intake pipe 4.

(Modified Example) In the above embodiment, an example was shown in which the fuel that is transmitted from above to the bottom is collected in the collecting section and guided to the ultrasonic vibrator. It may also be guided to an ultrasonic vibrator.

Although the supply section is formed as a pipe, it may also be formed as a groove. Further, a plurality of supply units may be provided.

Although an example has been shown in which the ultrasonic vibrator is placed in a branch path of the intake pipe, the present invention is not limited to this, and may be placed in the middle of a single intake pipe.

Although an example in which a gasoline engine is applied to the internal combustion engine is shown, the invention may be applied to other engines such as a diesel engine or an alcohol engine.

The invention is not limited to automobile engines.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the fuel vaporization auxiliary device, FIG. 2 is a perspective view of the fuel vaporization auxiliary device, and FIG. 3 is a sectional view of the vicinity of the cylinder head of an engine incorporating the present invention. In the figure, 1...engine, 4...intake pipe, 12...
... Fuel vaporization auxiliary device, 15 ... Ultrasonic vibrator, 1
6... Vibrating body support member, 26... Groove (collection part),
34...Pipe (supply section).

Claims (1)

[Claims for Utility Model Registration] 1. A fuel vaporization auxiliary device for an internal combustion engine comprising an ultrasonic vibrating body and a vibrating body support member that supports the ultrasonic vibrating body while disposed in an intake pipe, comprising: A fuel for an internal combustion engine, characterized in that the support member includes: a collection section that collects fuel traveling along the inner wall of the intake pipe; and a supply section that guides the fuel collected in the collection section to the ultrasonic vibrator. Vaporization aid. 2. The fuel vaporization auxiliary device for an internal combustion engine according to claim 1, wherein the collecting portion is a groove formed along the inner circumferential wall of the intake pipe. 3. The fuel vaporization auxiliary device for an internal combustion engine according to claim 1 or 2, wherein the supply section is a pipe. 4. The vibrating body support member includes a flange portion supported between an upstream intake pipe on the side provided with the fuel supply means and a downstream intake pipe that supplies fuel supplied from the upstream intake pipe to the combustion chamber, Utility model registration claim 1, characterized in that the ultrasonic vibrator is disposed within the intake pipe by disposing the flange portion between the upstream intake pipe and the downstream intake pipe. The fuel vaporization auxiliary device for an internal combustion engine according to any one of items 1 to 3. 5. The fuel vaporization auxiliary device for an internal combustion engine according to any one of claims 1 to 4, wherein the ultrasonic vibrator is disposed at a bent portion in the intake pipe. . 6. The internal combustion engine according to any one of claims 1 to 5, wherein the bent part is a branch part of a manifold pipe having one intake port and a plurality of discharge ports. Fuel vaporization auxiliary device.