JP2552587B2 - Lubricating oil shortage prevention device for 2-cycle internal combustion engine - Google Patents

Description

Detailed Description of the Invention

A. OBJECT OF THE INVENTION (1) Industrial field of use The present invention relates to measures for preventing running out of lubricating oil in a lubricating oil supply system in a two-cycle internal combustion engine.

(2) Conventional Technology and Problems Therefor, as a measure for preventing running out of lubricating oil in a conventional two-cycle internal combustion engine, a display on a lubricating oil indicator is usually adopted.
The indicator flashes when the amount of lubricating oil is low. Based on this display, the driver will be replenished with the lubricating oil within an appropriate time.
However, if this display is ignored and operation is continued, lubricating oil will not be supplied to the engine, resulting in a situation in which engine seizure will occur.

As described above, according to the conventional method, the prevention of running out of the lubricating oil depends on the judgment of the driver, and it is impossible to completely prevent the seizure of the engine. In addition, the lubricating oil supply system provided separately from the air-fuel mixture supply system is used as a separate oil supply system.
Cycle internal combustion engines are conventionally known (for example, JP-A-62-78).
482). Further, a two-cycle internal combustion engine having a carburetor equipped with a starting fuel adjusting device such as an electric motorcycle starter or an electric auto choke is also conventionally known (see, for example, Japanese Utility Model Laid-Open No. 62-18361).

(3) Problem to be Solved by the Invention The present invention has been made in view of the above circumstances, and automatically stops the engine before the engine burns without depending on the judgment of the driver. An object of the present invention is to provide a lubricating oil shortage preventive device for a two-cycle internal combustion engine capable of achieving the above. The present invention
Therefore, paying attention to the electric motorcycle starter,
By taking advantage of the characteristics of the motorcycle starter
Based on the knowledge that it is possible to prevent the lubricant from running out
Made on the basis of.

B. Structure of the Invention (1) Means for Solving the Problems The lubricating oil shortage prevention device for a two-cycle internal combustion engine of the present invention is
Specifically, the following configuration is adopted. That is, its main configuration
As described in claim 1, it communicates with the float chamber.
Starting fuel is supplied from the starting emulsion passage,
Electricity for opening and closing the starting intake passage that discharges the starting fuel to the airways
Air-fuel mixture supply with vaporizer with pneumatic motorcycle starter
Detector that detects the remaining amount of lubricating oil in the system and lubricating oil tank
In a separate refueling type two cycle equipped with a lubricating oil supply system
When the remaining amount of lubricating oil reaches the final level in a combustion engine,
The electric type through the control device by the signal from the detector
Supplying the mixture by shutting off the power supply to the motorcycle starter
It is characterized in that excess fuel is supplied to the system. Further
In addition, in addition to the above configuration, as described in claim 2,
The signal from the source is controlled by the controller to the first level and the final level.
The second level, which is the level, is discriminated as the first level.
The bell signal and the second level signal are output, and the first level
Signal the lubricating oil indicator by the signal and the second level signal
And the electric motorcycle system is driven by the second level signal.
The feature is that the power to the data is cut off.

(2) Function The remaining amount of lubricating oil in the lubricating oil tank is detected by the oil amount detector, and the signal sent from the oil amount detector is the first level and the second level which are the final level by the control device. It is determined that the level (the remaining amount of lubricating oil is smaller than the first level), and the first level signal and the second level signal are output, respectively. When the second-level signal is output energization of the electric motorcycle starter is cut by the current cut electric Haut
The Toby starter is gradually activated, and an excess air-fuel mixture is sent to the engine. As a result, the rotation of the engine does not follow the opening of the throttle valve, the engine malfunctions, and the engine stops before the remaining lubricating oil reaches zero. Electric motorcycles can be used by lubricating oil to the first level or above
The energized state of the tarta returns to normal and the engine malfunction is recovered. Furthermore, the switch for blinking the lubricating oil indicator is turned on by the first level signal and the second level signal, and the blinking of the lubricating oil indicator informs the driver that the amount of lubricating oil is low.

(3) Embodiment An embodiment of the lubricating oil shortage prevention device for a two-cycle internal combustion engine of the present invention will be described with reference to the drawings. FIG. 1 shows the overall configuration of the embodiment.

In FIG. 1, reference numeral 1 denotes a two-cycle internal combustion engine, an intake port 1a of which is provided with a carburetor 3 on an upstream side through an intake manifold 2, and an air intake port and an air cleaner (both not shown). ), And these constitute a mixture supply system of fuel and air. Reference numeral 4 is an intake passage of this mixture supply system. In the engine 1, 1b is an exhaust port and 1c is a crank chamber.

The carburetor 3 is juxtaposed with an electric starting fuel supply device, a so-called motorcycle starter 5 , and supplies a rich air-fuel mixture at the time of starting. That is, the motorcycle starter
At the time of startup, for communication with the float chamber of the carburetor
Starting fuel is supplied from the emulsion passage and
Open and close the starting intake passage that discharges the starting fuel,
Supply a mixture.

Reference numeral 7 is a lubricating oil tank, and a conduit 8 is introduced from the lubricating oil tank 7 through a lubricating oil pump 9 to an intake manifold 2 of a mixture supply system, and an opening portion of the conduit 8 is an internal combustion engine <br / > Provided in the intake manifold 2 near the intake port 1a of the engine 1. These constitute a lubricating oil supply system.

Therefore, the oil shortage prevention device of this embodiment is
The oil amount detector 1 installed in the lubricating oil tank 7 is installed over the mixture supply system and the lubricating oil supply system.
1. Control device 1 for processing a detection signal of the oil amount detector 11
2. A lubricating oil indicator 13 which operates by a signal from the control device 12 and the electric starting fuel supply device 5 described above.

Each of these components will be described in detail below. Oil amount detector 11 The oil amount detector 11 is installed at an appropriate position in the lubricating oil tank 7, and measures and detects the position of the oil surface of the lubricating oil in the lubricating oil tank 7, that is, the remaining amount of the lubricating oil. Then, this detected amount is sent to the control device 12 as an electric signal (usually a voltage).

[0013] Although a microcomputer is used as control device 12 control device 12, in this apparatus, it receives a signal sent from the oil amount detector 11, and the lubricating oil remaining first level and a second level When the remaining amount of lubricating oil reaches the first level and the second level, the function of outputting the first level signal and the second level signal, respectively, is used. Note that the first level indicates that there is still a sufficient amount, and the second level is the so-called final level.
This is a condition in which engine burning will occur soon after further driving. The setting of the second level is set to the limit at which the lowest remaining amount of lubricating oil does not reach the lubricating oil pump 9 before the engine is stopped.

Lubricating oil indicator 13 The lubricating oil indicator 13 is energized by the first level signal and the second level signal from the control device 12, and is turned on through the first level and the second level. You can also change the lighting state (blinking). Furthermore, a sound can be added.

Electric Start Fuel Supply Device 5 The electric start fuel supply device 5 is a second device from the controller 12.
It is activated by a level signal. The starting fuel adjusting device 5
Will be described in detail with reference to FIG. The starting fuel adjusting device 5 is mainly composed of an operating part 5a in which functional members such as a starting sliding valve, a starting fuel nozzle, and a needle valve are mounted in a housing, and an air-fuel mixture for starting the operation, and a temperature sensor. The temperature sensitive drive unit 5b for driving the sliding valve and the power supply unit 5c for sending a drive current to the temperature sensitive drive unit 5b.

First, the operating portion 5a includes a housing 15 and
The housing 15 is provided with a starting sliding valve 16, a starting fuel nozzle 17, and a needle valve 18. The housing 15 has two circular holes 20, 2 having a step inside.
1 is vertically installed on the same axis. Large diameter upper circular hole (sliding hole)
At 20, the inflow passage 22 and the outflow passage 23 communicate with each other, and the slide valve 16 is slidably guided by the inner peripheral surface of the circular hole 20 so as to move up and down.
The communication of 3 is interrupted. A fuel inlet 24 is provided at the bottom of the small-diameter lower circular hole 21. Then, the inflow passage 22 joins the intake passage 4 with the starting intake passage 2
5, the outflow passage 23 communicates with the downstream side, and the fuel inlet 24 is connected to the starting emulsion passage 2
Connect to 6. The carburetor 3 is composed of a carburetor main body 3a and a float chamber body 3b arranged below the carburetor main body 3a to define a float chamber 27. The housing 15 is fixed to the carburetor main body 3a by a mounting screw (not shown) through O-rings around these passage portions 22, 23 and 24 at the joint with the carburetor main body 3a.

Next, the temperature-sensing drive unit 5b includes a temperature-sensing device 31 having a piston 30 that expands and contracts according to temperature, a PTC-type heater 32 provided integrally with the temperature-sensing device 31, and the piston. A set collar 33 with which 30 abuts, a wax collar 34 that holds the temperature sensor 31 and guides the movement of the set collar 33, and a spring 35 interposed between the set collar 33 and the wax collar 34. The lower end of the wax collar 34 is fitted in the receiving portion of the upper portion of the housing 15 to fix the temperature sensitive driving portion 5b . The lower part of the set collar 33 releasably engages with the above-mentioned starting slide valve 16. Wax is built in the temperature sensor 31, and the piston 30 expands as the wax expands in response to a rise in temperature. The set collar 33 is urged toward the temperature sensor 31 side by the spring urging force of the spring 35, and the piston 30 is always in contact with the bottom of the cylindrical portion of the set collar 33. 37 is a wax holder, 38
Is a cap. A pair of terminals 40 and 41 are embedded in the wax holder 37.
0 and 41 are connected to both ends of the PTC heater 32, respectively.

[0018] These terminals 40 and 41 are drawn to the outside through the lead from the holder cap 38, the power supply unit 5c
Connected to. That is, one terminal 40 is connected to the intermediate portion of the charging power generation coil 45 in the AC generator 44 via the switch 43, and the other terminal 41 is grounded. The ignition power generation coil 46 of the AC generator 44 is connected to an ignition device 47, and the ignition device 47 is connected to the battery 50 via a main switch 48 and a fuse 49. Further, the charging power generation coil 45 is connected to a connection point of the main switch 48 and the fuse 49 via a diode 51 in order to charge the battery 50. The switch 43 is normally closed, but it is opened when the second level signal is output from the control device 12, and P
The energization to the TC type heater 32 is cut off.

The oil-depletion prevention device of this embodiment having the above-described structure operates as follows. The remaining amount of lubricating oil in the lubricating oil tank 7 reaches the first level, and the signal indicates that
When the judgment is made, the circuit of the lubricating oil indicator 13 is closed, the indicator is displayed in a blinking manner, and a notification is given. Needless to say, if the lubricating oil is replenished at this point and the remaining amount of lubricating oil returns to the original level, the circuit of the lubricating oil indicator 13 is opened and turned off.

Next, when the remaining amount of the lubricating oil in the lubricating oil tank 7 reaches the second level, the control device 12 discriminates the signal and outputs the second level signal to continue the energization of the warning lamp 13. The power supply to the starting fuel supply device 5 is cut off.

When the power supply to the starting fuel supply device 5 is cut off, the starter valve is opened and the excess air-fuel mixture is sent to the engine 1. As a result, the rotation of the engine 1 does not follow the opening of the throttle valve. That is, while the engine 1 is operating, the AC generator 44 also operates, the PTC type heater 32 generates heat by the electric power from the AC generator 44, the wax expands, the piston 30 expands, and the sliding throttle valve. 16 is pushed downward, and the inflow passage 22 and the outflow passage 23 of the starting intake passage 25 are
Since the gap is cut off, the engine 1 is supplied with an appropriate air-fuel mixture. However, when the power supply to the starting fuel supply device 5 is cut off, the heat generation of the heater 32 is stopped and the wax is cooled to the ambient temperature, so that the wax gradually shrinks.
Therefore, the piston 30 is pushed upward by the elastic force of the spring 35 and the sliding throttle valve 16 moves upward, and an amount of air corresponding to the opening of the throttle valve 16 flows in through the starting intake passage 25. A rich air-fuel mixture is formed by the air that has flowed in from the passage 22 and is sucked out from the starting fuel nozzle 17 by the circulation of this air, and the rich air-fuel mixture passes through the outflow passage 23 and the starting intake passage 25. And is discharged to the intake manifold 2. Therefore, an excessive air-fuel mixture is supplied to the engine 1 so that the engine malfunctions and the engine stops before the remaining lubricating oil reaches zero.

(Other Embodiments) In the above embodiment, the controller 12 discriminates the signal from the detector 11 into the first level and the second level, and outputs the first level signal and the second level signal to output the lubricating oil indicator. Is flashing, it is not always necessary to provide such a lubricating oil indicator.

C. EFFECTS OF THE INVENTION According to the lubricating oil shortage preventive device of the present invention, when the device continues to operate by ignoring the blinking display of the lubricating oil indicator, the device of the present invention is forcibly stopped before the engine burns. Therefore, the seizure of the engine due to running out of lubricating oil can be completely prevented. Also, according to the present invention, the lubricating oil is prevented from running out.
Since the valve of the starting fuel supply passage in the sealing device in a motorcycle starter opens gradually worsening driver arsenide utility occurs gradually, without causing sudden shock, reduction of lubricating oil remaining in the driver <br/> Can be recognized. Change
In addition, lubrication by fuel is also possible by supplying an excess air-fuel mixture to the engine.
This is done to compensate for the lack of lubricating oil before the engine is stopped. Further
Also, the lubricating oil shortage prevention device of the present invention is provided with
Using the starter as it is, adding a detector and control device
Other special complex equipment, such as a misfire circuit
The cost of equipment is low.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of an embodiment of a lubricating oil supply mechanism in a two-cycle internal combustion engine of the present invention.

FIG. 2 is a vertical cross-sectional view showing the entire structure of a starting fuel adjustment device installed in a carburetor main body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Two-cycle internal combustion engine, 2 ... Intake manifold, 3 ... Vaporizer, 5 ... Starting fuel supply device, 7 ... Lubricating oil tank, 8 ...
Conduit, 9 ... Lubricating oil pump, 11 ... Detector, 12 ... Control device, 13 ... Lubricating oil indicator

Claims (2)

(57) [Claims] 1. A starting armajo communicating with a float chamber.
Starting fuel is supplied from the intake passage, and the starting fuel is supplied to the intake passage.
Electric motorcycle star that opens and closes the starting intake passage for discharging
In a separated refueling two-cycle internal combustion engine equipped with a mixture supply system having a vaporizer with a rotor and a lubricant oil supply system having a detector for detecting the remaining amount of lubricant oil in the lubricant oil tank, When the final level is reached, the electric motorcycle star is controlled by a signal from the detector through a control device.
A device for preventing lubrication oil shortage of a two-cycle internal combustion engine, characterized in that an excess fuel is supplied to the air-fuel mixture supply system by cutting off power supply to the engine. 2. The signal from the detector is first detected by the controller.
The first level signal and the second level signal are respectively output according to the level and the second level which is the final level, and the lubricating oil indicator is blinked by the first level signal and the second level signal, and the second level signal is output. The device for preventing lubrication oil shortage of a two-cycle internal combustion engine according to claim 1, wherein the electric power to the electric motorcycle starter is cut off by a signal.