JPS62210252A - Supersonic fuel atomization device - Google Patents

Abstract

PURPOSE:To improve the efficiency of atomization, by linking the end of a rotary shaft of a throttle valve consisting of a metallic thin plate extended out of the intake passage, to a supersonic vibrator to give the atomization function to the throttle valve. CONSTITUTION:A throttle valve 2 consists of a disk-form metallic thin plate 11 contacted and fixed in the direction of the diameter to a rotary shaft 10, and the both ends of the rotary shaft are projected out of an intake pipe 1. One end of the projections is contacted to the acceleration pedal through a linking mechanism 12, and the other end is connected to the smaller bore portion 22 of a horn 18 fixed by a pedestal 17. At the larger bore portion 21 of the horn 18, a ring-form piezoelectric element 25 is installed through a bolt 27.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an ultrasonic fuel atomization device for promoting atomization of fuel supplied into a combustion chamber of an internal combustion engine.

<Prior art> An annular oscillator vibrated by an exciter is disposed in an intake passage continuous with a combustion chamber of an internal combustion engine, atomized fuel is injected from a fuel injection valve toward the annular oscillator, and the annular oscillator , an ultrasonic fuel atomization device that promotes atomization of fuel was disclosed in Japanese Patent Application Laid-open No. 5
It is known as disclosed in Japanese Patent Publication No. 8-210354, Japanese Patent Publication No. 0-11224, and Japanese Patent Application Laid-Open No. 0-81088.

This annular oscillator has a bending mode or an extensional (!
nsional) mode, and radiates ultrasonic waves toward the inner side and upper and lower end surfaces of the vibrator, thereby forming a sound field in these regions. The particulate fuel injected by the fuel injection valve comes into contact with the annular vibrator to be vibrated, and passes through a sound field, thereby becoming further atomized and promoting atomization.

<Problems to be Solved by the Invention> By the way, in such a system using an annular vibrator, the device tends to become complicated.

An object of the present invention is to provide a fuel atomization device that can achieve atomization of fuel with a simple structure without using an annular vibrator.

Means for Solving the Problems> The present invention provides ultrasonic wave treatment for the end of the rotation shaft of a throttle valve disposed in an intake passage communicating with a combustion chamber of an internal combustion engine, which extends outside the intake passage. It is characterized by being linked to a vibrator.

Effect> When the ultrasonic vibrator connected to the end of the rotating shaft of the throttle valve generates a vibration approximately equal to the resonance frequency of the throttle valve, the vibration propagates through the rotating shaft and is transmitted to the metal plate. be done. Therefore, the fuel injected from the fuel injection valve adheres to the metal plate and can be efficiently atomized by its vibration action.

<Embodiment> An embodiment of the present invention will be described with reference to FIG. 1 of the accompanying drawings.

Reference numeral 1 denotes an intake pipe that forms part of the intake passage and communicates with an air cleaner (not shown). A throttle valve 2 is provided in the intake pipe 1, and a fuel injection valve 3 is inserted upstream thereof with its mouth end facing the throttle valve z side. The end of the intake pipe 1 communicates with an intake port 6 of a manifold 5 that communicates with a plurality of combustion chambers.

The fuel injection valve 3 may be composed of an injection nozzle as shown in FIG. 1, or may be a venturi set, and its configuration is not limited.

Next, the configuration of the throttle valve 2 according to the main part of the present invention will be explained.

The throttle valve 2 is formed by fixing a disc-shaped thin metal plate 11 radially in contact with a cutting plane formed on a rotating shaft 10, with both ends of the shaft protruding outward from the intake pipe 1. There is. One end thereof is linked to an accelerator pedal by a link mechanism 12.

Further, an ultrasonic transducer 15 is linked to the other end of the rotating wheel. That is, a cylindrical support 16 is fixed to the outer surface of the intake pipe 1, and a mounting collar 19 for a horn 18 is fixed to a pedestal 17 formed at the other end by a pin 20. The horn 18 consists of a large diameter portion 21 around which the mounting flange 19 is formed, and a small diameter portion 22 coaxially connected from the center of the large diameter portion 21.
A linking hole 23 having a diameter approximately equal to the outer diameter of the rotating shaft 10 is formed at the end of the rotating shaft 10, and the other end of the rotating shaft 10 is inserted into the center of the cylindrical support body 16, and the other end of the rotating shaft 10 is inserted into the linking hole 23. The shaft 10 is loosely fitted and linked to the shaft 10. Furthermore, a screw hole 24 is formed in the end surface of the large diameter portion 21.

Furthermore, two annular piezoelectric elements 25, 25, which serve as exciters, and a metal block 26 of the same diameter are laminated on the end face of the large diameter part 21, and a bolt 27 is inserted into the center of the block to tighten the ends. is screwed into the screw hole 24, thereby constructing the ultrasonic transducer 15.

With this configuration, when an alternating voltage that substantially matches the resonant frequency of the throttle valve 2 is applied to the annular piezoelectric element 25, 25 at the time of starting the internal combustion engine, this vibration is amplified by the hole 718, and further the rotation shaft 10 Throttle valve 2 through
The vibration propagates to the thin metal plate 11, causing vibration of the thin metal plate 11.

Then, a sound field is generated around the thin metal plate 11, and the atomized fuel injected from the fuel injection valve 3 and attached to the surface of the thin metal plate 11 is further atomized. Fuel that has become atomized by the action of the thin metal plate 11 is supplied from the manifold 5 into each combustion chamber.

In this embodiment, the throttle valve 2 is rotated via the link mechanism 12 in conjunction with the depression of the accelerator pedal, and the rotation shaft 10 is loosely fitted into the link hole of the horn 18. Therefore, the rotation can be made without any problem without being transmitted to the horn 18.

FIG. 2 shows an embodiment in which the rotating shaft 10 and the horn 18 are fixed. In this case, as shown in FIG. The vibrator 15 may be rotatably held with respect to the support body 16 by interposing a bearing member 28 such as a pole bearing between the vibrator 15 and the mounting collar 24 .

<Effects of the Invention> As described above, the present invention creates an atomization function in the throttle valve by vibrating a thin metal plate by the action of an ultrasonic vibrator, so that it is possible to atomize fuel with a simple configuration. This has excellent effects such as good atomization of the fuel and good driving of the internal combustion engine, especially at the time of starting.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view showing a first embodiment of the present invention, and FIG. 2 is a longitudinal side view of main parts showing another embodiment. 1; Intake pipe 2; Throttle valve 3; Fuel injection valve 5;
Manifold 10. Rotation shaft 11; thin metal plate 15;
Ultrasonic vibrator 18; horn 25; annular piezoelectric element 28
;Bearing member Fig. 2

Claims (1)

[Claims] A throttle valve made of a thin metal plate disposed in an intake passage communicating with a combustion chamber of an internal combustion engine is characterized in that the end of the rotating shaft extending outside the intake passage is linked to an ultrasonic vibrator. Ultrasonic fuel atomizer.