JPH0723563Y2 - Engine yoke device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] (Field of Industrial Application) The present invention relates to an engine yoke device for increasing the concentration of fuel during starting to facilitate starting.

(Prior Art and Problems to be Solved) Conventionally, an engine chain yoke device for increasing the fuel concentration at the time of starting and facilitating the starting is provided at the intake port 1 of the engine as shown in FIGS. 4 and 5. A choke yoke valve 5 for opening and closing the suction port 3 of the fixed carburetor 2 is pivotally mounted by a shaft 7 in a direction orthogonal to the intake passage 9 so that the choke yoke valve 5 can be swung and sucked. If the area of the mouth 3 is appropriately reduced, the negative pressure of the intake passage 9 increases due to the intake force of the engine, and the fuel ejected from the main nozzle opening 11 that opens in the intake passage 9 increases to increase the fuel contained in the intake air. Is provided so that the engine concentration can be increased and the engine can be easily started. In this conventional configuration, in addition to the starting operation of rotating the crankshaft, it is necessary to operate the chain yoke valve to an appropriate opening degree, and moreover, after the engine is started, it is necessary to quickly return and open the chain yoke valve. It was.

Further, the intake pressure is lowered by closing the chain yoke valve, and a large force is required to start the engine.

Therefore, as shown in FIG. 6, the intake passage 18 of the carburetor 17 is
A starter nozzle 41 is provided in the fuel tank 25, and the starter fuel pump 49 sucks the fuel in the fuel tank 25 into the fuel sump 61.
In some cases, when the engine is started, the concentration of the air-fuel mixture is increased without lowering the intake pressure to facilitate the starting.

In this method, the fuel other than the fuel pool 61 is also sucked and discharged due to the pressure fluctuations in the forward and reverse rotations of the starting fuel pump 49, the fuel ejected from the starting nozzle port 41 is not constant, and the starting fuel pump 49 is driven. Even if the voltage of the electric motor 57 for fuel fluctuates, the ejected fuel was not constant and the starting could not be ensured.

[Constitution of device]

(Means for Solving the Problems) The present invention provides an electromagnetic valve between a starting fuel pump and a starting nozzle port, and seals the upper part of a fuel pool communicating with a fuel passage between the starting fuel pump and the electromagnetic valve. The structure has an air pocket.

(Operation) In the present invention, the fuel in the fuel tank is pumped to the fuel reservoir by the starting fuel pump, and the invading fuel is quantified by the air reservoir opposing as a spring, and the starting fuel pump is stopped and the The valve is opened, and a fixed amount of fuel stored in the fuel reservoir is jetted from the auxiliary nozzle port by the pressure of air in the compressed air reservoir, and at the same time, the starting motor is rotated to start the engine.

(Embodiment) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, a carburetor 17 is fixed to the intake port 13 of the engine via a heat insulator 15 by a bolt (not shown). A main nozzle port 19 that opens to an intake passage 18 that communicates with the intake port 13 communicates with a fuel chamber 21 provided in the lower portion of the carburetor 17. The fuel chamber 21 is provided with a main fuel passage 27 that communicates with a fuel tank 25 via a diaphragm pump 23. The pressure chamber 29 of the diaphragm pump 23 is provided with a diaphragm 33 that vibrates according to the positive and negative pressures of the crankcase by a communication pipe 31 that communicates with a crankcase (not shown) of the engine, and the pump chamber 35 is partitioned. Has been.
The main fuel passage 27 communicates with the pump chamber 35 via check valves 37, 39. A starting nozzle port 41 is opened in the intake passage 18 and communicates with a fuel tank 25 via a starting fuel passage 43. A start fuel pump 49 is provided in the start fuel passage 43 via a check valve 45.
Is provided as a power source, and is driven by a fuel electric motor 57 via a push button type switch 53 and a control device 55. An electromagnetic valve 59 is provided between the starting fuel pump 49 and the starting nozzle port 41, and the starting fuel pump 49 and the electromagnetic valve 59 are provided.
A lower portion of the fuel pool 61 is communicated between and, and an upper portion of the fuel pool 61 is formed with an air pool 63 having a sealed structure against the outside air. A pressure sensor that senses pressure at the top of the air pocket 63
A control device 55 is provided to stop the starting fuel pump 49 when the predetermined pressure is reached in conjunction with the operation of the pressure sensor 65, operate the starting electric motor 67, and open the solenoid valve 59. Controlled. A throttle hole 69 is provided in a passage that branches from the fuel passage and communicates with the fuel tank 25 between the starting fuel pump 49 and the electromagnetic valve 59. Further, a temperature sensor for detecting the temperature is provided in the vicinity of a cylinder (not shown) of the engine.

The control device 55 is configured as follows. That is,
Relays RL1, RL2, RL3 are connected via switch 53 to battery 51
The contact point 73 of the pressure sensor 65 is connected in series to the RL2, and the contact point 75 of the temperature sensor 71 is connected in series to the relay RL3. Further, the solenoid 77 of the solenoid valve 59, the starting electric motor 67, and the fuel electric motor 57 are connected in parallel to the battery 51 via the switch 53, and the solenoid 77 has a relay RL.
The contact r2 of 2 and the contact r3 of the relay RL3 are connected in series, the contact r2 and the contact r3 provided in parallel are connected in series to the starting motor 67, and the contacts r1 and r of the relay RL1 are connected to the fuel motor 57.
2, r3 are connected in series. The lamps 79 and 81 are connected in parallel to the battery 51 through the switch 53,
A contact r2 is connected to 79 and a contact r3 is connected to the lamp 81 in series.

With the above configuration, when starting the engine,
When the push button type switch 53 is pressed, the relay RL1 is energized, the contact r1 is activated, and the fuel electric motor 57 starts to rotate. The fuel in the fuel tank 25 is sucked by the starting fuel pump 49 via the check valve 45 and returns to the fuel tank 25 via the throttle hole 69, but the pressure increases due to the resistance of the throttle hole 69, and the air pool
63 air is compressed and enters the fuel pool. Since the air in the air reservoir 63 is sealed against the outside air against the invasion of the fuel, it opposes as an air spring to quantify the fuel in the fuel reservoir 61. When the pressure in the air pocket 63 reaches a predetermined pressure,
Pressure sensor 65 is activated and contact 73 is closed, relay RL2
When the current is energized, the contact r2 is actuated, the lamp 79 is turned on, the fuel motor 57 is stopped, and at the same time, the solenoid 77 is energized to open the solenoid valve 59, and a fixed amount of fuel in the fuel pool 61 is discharged. The pressure of the air reservoir 63 causes the jet from the starting nozzle port 41, and at the same time, the starting electric motor 67 rotates to start the engine. When the push button type switch 53 is released, the starter motor 73 is stopped and the contacts are restored to their original positions.

When the engine is restarted or the temperature is high, the temperature sensor 71 is activated and the contact 75 is connected, and when the relay RL3 is energized, the lamp 81 is turned on and the solenoid 77 and the fuel electric motor 57 are de-energized to start. Fuel does not spout from the nozzle port 41. At the same time, the starting electric motor 67 rotates and the engine starts.

FIG. 3 shows another embodiment in which a second solenoid valve 83 is provided in place of the throttle hole 69, and the second solenoid valve 83 is configured to open when the pressure sensor 65 operates. There is.
In FIG. 3, the same reference numerals as those shown in FIG. 1 represent the same components.

In the present invention, a recoil starter may be used instead of the starting motor to start the motor manually. Further, in the above-described embodiment, the starting nozzle port 41 is provided separately from the main nozzle port 19, but this starting nozzle port 41 may be provided in common with the main nozzle port 19.

The same operation may be performed by using an electronic device such as a transistor or a thyristor instead of the relay or contact of the electric circuit of the control device 55.

[Effect of device]

According to the present invention, the starting operation of the engine is facilitated, the back pressure is eliminated, a large force is not required for starting, and the concentration of the air-fuel mixture can be increased without lowering the intake pressure. It is possible to ensure the starting by keeping the amount of the fuel of the vehicle constant.

FIG. 6 shows a second conventional example, in which the fuel pump 49 is normally and reversely rotated to suck the fuel into the fuel pool 61 to start the nozzle opening.
The reference numeral 41, which is the same as the reference numeral shown in FIGS. 1 and 2, indicates the same component, and the temperature sensor 71 detects a predetermined temperature to detect the temperature inside the fuel passage 41. A second controller 89 for closing the on-off valve 85 is provided, and a separate switch 91 for the starting motor 67 is provided.

[Brief description of drawings]

FIG. 1 is an explanatory view of a fuel system passage showing the constitution of one embodiment of the present invention, FIG. 2 is an explanatory view of an electric circuit, and FIG. 3 is an explanatory view of a fuel system passage showing the constitution of the second embodiment. 4 and 5 are a side sectional view and a front view, respectively, of the conventional example, and FIG. 6 is a fuel system path explanatory diagram showing the configuration of the second conventional example. 17 …… Vaporizer 18 …… Intake passage 25 …… Fuel tank 41 …… Starting nozzle port 49 …… Starting fuel pump 59 …… Solenoid valve 61 …… Fuel reservoir 63 …… Air reservoir 65 …… Pressure sensor 67 …… Starting motor 55 …… Control device 69 …… Throttle valve 83 …… Second solenoid valve

Claims (4)

[Scope of utility model registration request] 1. A starter nozzle port 41 opening to an intake passage 18 of a carburetor 17, and a starter fuel pump 49 for supplying fuel from a fuel tank 25 to the starter nozzle port 41 via a solenoid valve 59. An air reservoir 63 having a closed structure against the outside air is provided above a fuel reservoir 61 communicating with the passage between the starting fuel pump 49 and the solenoid valve 59. The air reservoir 63 has a predetermined fuel amount in the fuel reservoir 61. An engine chiyoke device characterized in that it opposes the entry of fuel as an air spring until it reaches a certain value. 2. A pressure sensor for detecting the pressure of the air reservoir 63.
The control device 55 is provided, which is provided with 65, stops the starting fuel pump 49 in conjunction with the operation of the pressure sensor 65, and controls the operation of the starting electric motor 67 and the opening / closing operation of the solenoid valve 59. Chiokek device of the engine described. 3. A throttle hole 69 is provided in a passage that branches from a fuel passage between the starting fuel pump 49 and the electromagnetic valve 59 and communicates with the fuel tank 25, according to claims (1) and (2). Chiokek device of the engine described. 4. A second solenoid valve 83 is provided in a passage that branches from a fuel passage between the starting fuel pump 49 and the solenoid valve 59 and communicates with the fuel tank 25, and the second solenoid valve 83 is provided with the second solenoid valve 83. The starting fuel pump 49 closes in conjunction with the start of operation, and the starting electric motor
The engine yoke device according to any one of claims (1) and (2), which is provided so as to be opened in association with the stop of operation of 67.