JPH0752338Y2 - Fuel supply device for model engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fuel supply device for a model engine.

[Prior Art] In recent years, a method of driving a supercharger with a model engine to supercharge the engine has been adopted.

In a model engine equipped with a supercharger, a large amount of air-fuel mixture can be supplied to the model engine, so that there is an advantage that the output of the engine can be increased.

[Problems to be solved by the device]

However, when the model engine is idling or rotating at low speed, the supercharging pressure becomes high, and it is difficult to delicately control intake air and fuel, resulting in uneven rotation.

Also, when mounted on a model airplane, when it is dropped from the sky in the idling state, the propeller is rotated by the wind pressure and the rotation gradually becomes faster, and the supercharging pressure increases with the improvement of the rotation speed of the propeller. The rotation will increase. For this reason, braking by the propeller becomes ineffective, which makes it difficult to control the airplane.

In view of this, the technical problem of this invention is to solve the above inconvenience and to stabilize the engine during idling or during low speed rotation.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, in the present invention, the mixture air outlet of the carburetor is connected to the intake passage inlet of the supercharger for charging the mixture for the model engine, and the carburetor is connected to the surge tank of the supercharger. Is installed in the carburetor, and is rotated by remote control to adjust the opening of the air inlet of the carburetor, and when the cab rotor is in the idling state, the mixture passage of the return passage and the cab rotor is installed. That is, a structure in which a circulation passage for communicating with and is provided is adopted.

[Action]

According to the above configuration, when the cab rotor is rotated to reduce the opening of the air inlet of the carburetor, the circulation passage provided in the cab rotor communicates with the return passage, and the mixing passage of the cab rotor and the surge tank of the supercharger are formed. The air-fuel mixture will be communicated via the return passage and the circulation passage, and the air-fuel mixture sent to the surge tank of the supercharger will be returned to the air-fuel mixture passage of the cab rotor and will be supplied to the model engine from the surge tank. Can be reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a rotor storage space 2 is formed inside the supercharger 1, and a pair of rotors 3a and 3b are rotatably incorporated in the rotor storage space 2.

The rotor shaft 4 of one rotor 3a of the pair of rotors 3a, 3b penetrates the side wall of the supercharger 1, and the torque transmission plate 5 is attached to the end of the rotor shaft 4 facing the outside. A notch 6 is provided at the end of 5.

An eccentric pin provided at an end of a crankshaft of a model engine (not shown) is inserted into the cutout portion 6. Therefore, when the crankshaft rotates, one rotor 3a rotates, and the rotation is transmitted to the other rotor 3b via the gears 7 that mesh with each other.

The pair of rotors 3a, 3b rotate in mutually opposite directions, and the rotation causes the air-fuel mixture in the intake passage 8 formed inside the supercharger 1 to be fed into the surge tank 9, and from the surge tank 9 the model. Is supplied into the cylinder of the engine.

A return port 10 is formed on the side wall of the surge tank 9.

A carburetor 11 is attached to the side surface of the supercharger 1. 3 to 5 show details of the carburetor 11. The rotor body 12 has a rotor fitting hole 13,
An air inlet 14 and an air-fuel mixture outlet 15 which communicate with the rotor fitting hole 13 are formed.

A cabin rotor 16 is rotatably assembled in the rotor fitting hole 13, and a radial mixture passage 17 is formed in the casing rotor 16 to connect the air inlet 14 and the mixture outlet 15.

The cab rotor 16 is rotated by remote control, and the rotation causes the mixture passage 17 to be displaced in the circumferential direction with respect to the air inlet 14, and the opening degree of the air inlet 14 is adjusted.

Further, in the above-mentioned cab rotor 16, the mixture passage is
An axial hole 18 reaching 17 is formed, and the nozzle is inserted in the hole 18.
19 and one end of the metering valve 20 are inserted.
The other end of the metering valve 20 has a rotor fitting hole 13
Is inserted into a valve fitting hole 21 in the axial direction provided on the bottom surface of the.

The metering valve 20 is connected to the cab rotor 16 via a positioning pin 22 and rotates together with the cab rotor 16.

The metering valve 20 is formed with a hole 23 extending in the axial direction from an end face located in the cabin rotor 16 and a radial hole 24 communicating with the hole 23 from the outer circumference of the other end. Further, on the outer periphery of the other end of the metering valve 20, the fuel passage formed in the radial hole 24 and the carburetor main body 12 is formed.
A V-shaped groove 26 that communicates with 25 is provided. This V groove 26
The groove width of is gradually widened toward the radial hole 24.

Therefore, by rotating the metering valve 20 together with the cam rotor 16, the inflow amount of the fuel flowing from the fuel passage 25 into the holes 23, 24 of the metering valve 20 can be adjusted.

The fuel flowing into the holes 23 and 24 is sent from the nozzle 19 to the air-fuel mixture passage 17 and mixed with the air flowing into the air-fuel mixture passage 17. Reference numeral 27 denotes a needle valve for adjusting the opening degree of the fuel passage 25.

The carburetor 11 having the above configuration is attached to the supercharger 1 so that the mixture outlet 15 communicates with the inlet 8a of the intake passage 8 of the supercharger 1.

A return passage 28 communicating with the return port 10 provided in the supercharger 1 is formed in the carburetor main body 11. On the other hand, the recirculation passage 30 that connects the return passage 28 and the air-fuel mixture passage 17 is formed in the cab rotor 16 when the cab rotor 16 is in the idling state.

Here, as shown in FIG. 6, the circulation passage 30 includes an annular groove 31 formed in the front end surface of the cab rotor 16 and the cab rotor 16.
The first through hole 32 in the radial direction reaching the annular groove 31 from the outer periphery of the second axial second hole reaching the mixture passage 17 from the groove bottom of the annular groove 31.
The first through hole 32 connects the return passage 28 in the idling state in which the cab rotor 16 is rotated and the air inlet 14 is narrowed down.

The fuel supply device shown in the embodiment has the above-mentioned structure, and FIGS. 3 to 5 show a state in which the cabin rotor 16 is fully opened, and the return passage 28 is closed by the outer circumference of the cabin rotor 16, and the circulation passage is shown. It is blocked from 30.

In the above state, when the pair of rotors 3a, 3b of the supercharger 1 are rotated, the air-fuel mixture formed by the Cab rotor 16 is pressure-fed from the intake passage 8 to the surge tank 9, and the surge tank 9 Supplied to the model engine.

When the mixture is supplied as described above, the
16 is rotated by remote control so that the mixture passage 17 is connected to the air inlet 14
When the model engine is idled by squeezing the air inlet 14 so that it does not move, as shown in FIG.
30 communicates with the return passage 28.

Therefore, the air-fuel mixture sent into the surge tank 9 flows into the air-fuel mixture passage 17 through the return port 10, the return passage 28 and the circulation passage 30, and then from the air-fuel mixture passage 17 through the air-fuel mixture outlet 15 to the intake passage. Returned to 8.

As described above, in the idling state, the air-fuel mixture is returned from the supercharger 1 to the carburetor 11, so that the amount of the air-fuel mixture supplied to the model engine can be reduced and the rotation of the model engine can be stabilized. You can

[Effect of device]

As described above, in the fuel supply device according to the present invention, a part of the air-fuel mixture supplied from the supercharger to the model engine is returned to the carburetor when the model engine is idling. This makes it easier to perform delicate control and stabilizes the rotation of the model engine during idling.

Also, when mounted on an airplane, if the airplane is lowered from above in the idling state, even if the propeller is rotated by wind pressure, the supercharging pressure does not rise, and the rotation of the propeller is also suppressed. A large braking effect is exerted, which makes it easy to control an airplane.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a fuel supply device according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a vertical sectional front view of the same carburetor. 4 is a cross-sectional plan view of the same as above, FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4, and FIGS. 6 and 7 are cross-sectional views of the carburetor during idling. 1 ... Supercharger, 9 ... Surge tank, 11 ...
… Calibrator, 15 …… mixture outlet, 16 …… cab rotor, 28 …… return passage, 30 …… recirculation passage.

Claims (1)

[Scope of utility model registration request] 1. A mixture outlet of a carburetor is connected to an intake passage inlet of a supercharger for filling a mixture for a model engine, and the carburetor is provided with a return passage communicating with a surge tank of the supercharger. The cab rotor, which is built in and rotated by remote control to adjust the opening of the air inlet of the carburetor, is provided with a circulation passage that connects the return passage with the mixture passage of the cab rotor when the cab rotor is in an idling state. Fuel supply device for model engine.