JPH0729241Y2 - Engine yoke device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention is used for a duster, a blower, a brush cutter, etc. for increasing the concentration of fuel at the time of starting to facilitate starting. The present invention relates to a chain yoke device of an engine with a starter (starting electric motor).

(Prior Art and Problems to be Solved) Conventionally, an engine chain yoke device for increasing the fuel concentration at the time of starting to facilitate starting is provided at the intake port 1 of the engine as shown in FIG. 5 and FIG. 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, and the choke yoke valve 5 is swung for suction. 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.

[Constitution of device]

(Means and Actions for Solving Problems) The present invention is provided with a starting nozzle port that opens to an intake passage of a carburetor, and a starting fuel pump for supplying fuel from a fuel tank to a fuel reservoir. The fuel of the starting fuel pump or the suction force of the engine to transfer it to the starting nozzle port through the starting nozzle passage, and to start the fuel electric motor for driving the starting fuel pump and the engine. It is provided in conjunction with the electric motor to operate sequentially.By pushing the switch once, the electric motor for fuel drives the starting fuel pump to suck the fuel in the fuel tank and supply it to the fuel pool. After the fuel is filled in the puddle, the starting electric motor operates to drive the fuel electric motor at the same time, or the fuel is ejected from the starting nozzle port by the suction force of the engine. The electric motor for fuel and the electric motor for starting are automatically and sequentially operated by one switch operation. In addition, by providing a timer that stops the fuel supplied to the starting nozzle port for a predetermined time when the switch of the fuel electric motor is opened, the engine does not start with this one operation, and when the switch is pressed again, Since the fuel supplied from the starting nozzle port remains in the cylinder and causes ignition failure, when you press the switch a second time, stop the fuel so that it will not be supplied to the starting nozzle port.
It makes it easier to ignite and 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 this 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 starting fuel pump 49 is provided in the starting fuel passage 43 via check valves 45 and 47, and the battery 51 is used as a power source, and a fuel electric motor 57 is operated via a push button type switch 53 and a main controller 55. It is driven forward and backward freely. The starting fuel pump 49 has one end communicating with the starting fuel passage 43 at the intermediate position between the check valves 45 and 47 through a fuel sump 59, and the other end connected to the fuel tank 25.
Is in communication with. In addition, a sensor 61, which detects the temperature in proximity to an engine cylinder (not shown), switches 53
The control valve 65 provided in the starting fuel passage 43 is connected to the control valve 63 connected to the control valve 63 to control the amount of fuel flowing in the starting fuel passage 43 to an appropriate amount according to the temperature of the cylinder.

Main controller 55 is configured as follows. That is, the first controller 69 communicating with the switch 53 is the second controller 71.
Is connected in parallel to the transistor TR1 and the transistor TR1 is connected to the power supply via the relay RL1. The second controller 71 is connected in parallel with the transistors TR2, TR3, TR4,
Transistors TR2, TR3, TR4 are relays RL2, RL3, R respectively
Connected to power via L4. The starting electric motor 73 is connected to the power source 51 via the contact r4 of the relay RL4, and the fuel electric motor 57 is connected to the electric power source via the contact r3 of the forward / reverse switching relay RL3. Relay between contact r3 and power supply 51
The contact r1 of RL1 and the contact r2 of relay R2 are provided in parallel. A temperature switch 75 is connected in series with the contact r2.
An electronic buzzer 77 is connected in parallel to the fuel electric motor 57. A timer is built in the first controller 69, and is provided so as to communicate with the transistor TR1 and cut off the energization of the transistor TR1 and energize the second controller 71 after a lapse of a predetermined time.

Further, a timer is also built in the second controller 71 so that the transistor TR2 is energized and the transistor TR2 is deenergized when a predetermined time elapses, and the transistor TR2 is not energized until a predetermined time elapses.

In the above configuration, when the engine 53 is started, when the switch 53 is pressed, the transistor TR1 is activated, the relay RL1 is energized, the contact r1 is connected, and the fuel motor 5
The forward rotation of 7 causes the starting fuel pump 49 to rotate, and the fuel is sucked from the fuel tank 25 through the check valve 45 to the starting fuel pump 49 from the fuel pool 59 and recirculates to the fuel tank 25. Fuel puddle
When the predetermined time to fill 59 with fuel elapses, the first controller
The timer in 69 operates, the transistor TR1 is cut off, the contact r1 is cut off, and at the same time the transistors TR2, TR
When the relays RL2, RL3, RL4 are energized by the TR3 and the contact r2 is connected for a predetermined time, and the contact r3 is energized during this time to reverse the electric motor 57 for fuel, the starting fuel pump 49 reverses. The fuel in the fuel pool 59 is sent to the starting nozzle port 41 through the check valve 47 and ejected into the intake passage 18. At the same time, the contact r4 is connected to rotate the starting electric motor 73 to rotate the engine and start the engine. With respect to the fuel ejected from the starting nozzle port 41, the controller 63 issues a command to the control valve 65 by the sensor 61 that senses the temperature of the cylinder, and the control valve 65 is opened / closed in accordance with this temperature to appropriately adjust the temperature. It sends a quantity of fuel. When the engine starts, the diaphragm 33 vibrates in response to the fluctuation of the crankcase pressure, and if the switch 53 is shut off without starting the engine, the transistor TR2 is not energized for a predetermined time by the timer.
Even if 3 is pressed, the relay R2 does not operate, the fuel electric motor 57 does not rotate, the fuel is not supplied again from the starting nozzle port 41, and the starting electric motor 73 rotates.

When the temperature of the engine or the outside air is high and fuel from the starting nozzle opening 41 is not needed, the temperature switch 75 installed at an appropriate position is shut off and the motor 57 for fuel is not rotated in reverse. Fuel does not squirt from 41.

Incidentally, FIG. 3 shows another embodiment of the fuel pump.
49 does not reverse, and the fuel in the fuel pool 59 is sucked and ejected from the starting nozzle port 41 by the suction force of the engine. The fuel electric motor 57 rotates, and the starting electric motor 73 operates sequentially after a predetermined time, as in the above-described embodiment.

Further, FIG. 4 shows a third embodiment, in which the discharge side of the starting fuel pump 49 is connected to the starting nozzle port 41, and a fuel pool 59 is provided in the middle thereof. Electric motor
Similarly, 73 and 73 can be sequentially activated by a timer.

The present invention may be arranged such that the starting electric motor is sequentially operated by sensing the fuel in the fuel pool by a pressure switch or the like provided in the fuel pool, instead of the timer.

[Advantage of the Invention] As described above, according to the present invention, by pushing the switch once, the electric motor for fuel is operated to supply the fuel to the fuel pool, and then the electric motor for starting the engine is automatically operated. The engine is operated in sequence to increase the fuel concentration in the carburetor and eject it to increase the intake concentration, facilitating engine ignition, starting the engine easily and reliably, and when the engine does not start When the switch is pushed again by stopping the fuel supplied from the device for a predetermined time, the intake concentration is made appropriate and the starting is facilitated.

In addition, in the above-described embodiment, the starting nozzle port 41 is the main nozzle port.
Although provided separately from 19, the starting nozzle port 41 may be used in common with the main nozzle port 19.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a system showing a configuration of one embodiment of the present invention, FIG. 2 is an explanatory diagram of an electric circuit, and FIGS.
2, an explanatory diagram showing the configuration of the third embodiment, FIG. 5, FIG.
The figures are a side view and a front view, respectively, of a conventional example. 17 …… Vaporizer 18 …… Intake passage 25 …… Fuel tank 41 …… Starting nozzle port 43 …… Starting fuel passage 49 …… Starting fuel pump 57 …… Fuel electric motor 59 …… Fuel sump 73 …… Starting electric motor

Claims (1)

[Scope of utility model registration request] 1. A starting fuel pump 49 which is provided with a starting nozzle port 41 opening to an intake passage 18 of a carburetor 17 and supplies fuel of a fuel tank 25 to the starting nozzle port 41 by a starting command of a sensor 61 for detecting a temperature. A fuel electric motor 57 for driving the starting fuel pump 49 is provided, and a switch 53 for activating the fuel electric motor 57 by turning on the fuel and activating the starting electric motor 73 in synchronization with the operation of the fuel electric motor 57 is provided. When the second ON operation is performed after the first ON operation of 53, the starting electric motor 73 is operated, and the fuel electric motor 57 is operated for a predetermined time regardless of the start command of the sensor 61. The engine yoke device with no timer.