JPH04365914A - Lubricating oil shortage preventing device for two-cycle internal combustion engine - Google Patents

Abstract

PURPOSE:To positively establish a malfunction of an internal combustion engine so as to stop the engine before the remainder of lubricating oil becomes zero and prevent shortage of the lubricating oil by operating a start fuel refulator so as to supply excessive fuel to a mixture supply system when the remainder of lubricating oil reaches a low level. CONSTITUTION:A intake port 1a of a 2-cycle internal combustion engine 1 is provided with a carburetor 3 in the upstream via an intake manifold 2. An electric start fuel supplying device 5 is attached to the carburetor 3, for supplying a rich mixture at the time of start. A conduit 8 extending from a lubricating oil tank 7 is connected to the intake manifold 2 via a lubricating oil pump 9. With this constitution, a controller 12 controls the device 5 and a lubricating oil indicator 13 on the basis of a detection signal output from an oil quantity detector 11 disposed in the lubricating oil tank 7. When the lubricating oil is lower down to a second level, the controller 12 operates the divece 5 to supply excessive fuel to a mixture supplying system, thereby stopping the internal combustion engine 1.

Description

[Detailed description of the invention]

[0001]A. OBJECTS OF THE INVENTION (1) Industrial Application Field This invention relates to measures to prevent lubricant oil supply system in a two-stroke internal combustion engine from running out.

(2) Conventional technology and its problems As a measure to prevent lubricant oil from running out in conventional two-stroke internal combustion engines, a lubricant indicator is usually used to indicate when the lubricant level is low. The indicator is now blinking. Based on this display, the driver replenishes the lubricating oil within an appropriate time. However, if you ignore this display and continue to drive, lubricating oil will not be supplied to the engine, leading to a situation where the engine seizes up.

[0003] As described above, depending on the conventional system, prevention of lubricant oil depletion depends on the driver's judgment, and it is impossible to completely prevent engine seizure. In addition, there are two separate oil supply systems in which the lubricating oil supply system is separate from the mixture supply system.
Cycle internal combustion engines are conventionally known (for example, Japanese Patent Application Laid-Open No. 62-78
(See Publication No. 482, etc.). Furthermore, two-stroke internal combustion engines having a carburetor equipped with a starting fuel regulating device such as an electric motorcycle starter or an electric auto choke are also known (see, for example, Japanese Utility Model Application Publication No. 18361/1983).

(3) Problems to be Solved by the Invention The present invention has been made in view of the above-mentioned circumstances, and aims to automatically stop the engine before the engine seizes up without depending on the driver's judgment. An object of the present invention is to provide a lubricating oil shortage prevention device for a two-stroke internal combustion engine.

B. Arrangement of the Invention (1) Means for Solving the Problems In order to achieve the above object, the lubricating oil shortage prevention device for a two-stroke internal combustion engine of the invention adopts the following arrangement. That is, in a separate oil supply type two-stroke internal combustion engine equipped with a mixture supply system having a carburetor with an electric starting fuel adjustment device and a lubricating oil supply system having a detector for detecting the remaining amount of lubricating oil in a lubricating oil tank. , when the remaining amount of lubricating oil reaches a low level, a signal from the detector activates the starting fuel adjustment device to supply excess fuel to the mixture supply system.

(2) Operation The remaining amount of lubricating oil in the lubricating oil tank is detected by the oil amount detector 11, and the signal sent from the oil amount detector 11 is sent to the first level and second level by the control device 12. (The remaining amount of lubricating oil is less than the first level), and a first level signal and a second level signal are output, respectively. When the second level signal is output, the power supply to the starting fuel supply device 5 is cut off, and as a result of this power cut off, the starting fuel supply device 5 gradually operates, and excess air-fuel mixture is sent to the engine 1. As a result, the rotation of the engine 1 no longer follows the opening degree of the throttle valve, the engine malfunctions, and eventually the engine 1 stops before the remaining amount of lubricating oil reaches zero. By increasing the lubricating oil to a first level or higher or filling the tank to full capacity, the energization state of the starting fuel supply device returns to normal, and the engine malfunction is recovered. Note that the first level signal and the second level signal turn on a switch that causes the lubricating oil indicator to blink, and the blinking of the lubricating oil indicator notifies the driver that the lubricating oil is running low.

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

In FIG. 1, reference numeral 1 denotes a two-stroke internal combustion engine, in which a carburetor 3 is disposed at the upstream side of an intake manifold 2 at an intake port 1a, and an air intake port and an air cleaner (both not shown) are provided. ), and these constitute a fuel-air mixture supply system. 4 is an intake path of this air-fuel mixture supply system. In the engine 1, 1b indicates an exhaust port, and 1c indicates a crank chamber.

[0009] An electric starting fuel supply device, so-called a motorcycle starter 5, is arranged in parallel with the carburetor 3, and supplies a rich air-fuel mixture at the time of starting.

Reference numeral 7 denotes a lubricating oil tank, and a conduit 8 is led from the lubricating oil tank 7 to the intake manifold 2 of the mixture supply system via a lubricating oil pump 9, and the opening of the conduit 8 is connected to the fuel engine 1. It is provided in the intake manifold 2 near the intake port 1a. These constitute a lubricating oil supply system.

[0011] Therefore, the oil runout prevention device of this embodiment is as follows:
The oil amount detector 1 is installed across the mixture supply system and the lubricating oil supply system, and is installed in the lubricating oil tank 7.
1. Control device 1 that processes the detection signal of the oil amount detector 11
2. A lubricating oil indicator 13 operated by a signal from the control device 12 and the electric starting fuel supply device 5 described above.
, consists of.

Each of these components will be explained in detail below. Oil Quantity Detector 11 The oil quantity detector 11 is installed at an appropriate position in the lubricating oil tank 7 and measures and detects the position of the lubricating oil level in the lubricating oil tank 7, that is, the remaining amount of the lubricating oil. This detected amount is then sent to the control device 12 as an electrical signal (usually a voltage).

Control device 12 A microcomputer or the like is used as the control device 12, and this device receives a signal sent from the oil amount detector 11 and divides the remaining amount of lubricating oil into a first level and a second level. A function is used to output a first level signal and a second level signal when the remaining amount of lubricating oil reaches a first level and a second level, respectively. Note that the first level indicates a state in which there is still sufficient fuel remaining, and the second level indicates a state in which the engine will soon seize if the vehicle is driven any further. The setting of the second level is a limit at which the lowest remaining amount of lubricating oil does not reach the lubricating oil pump 9 before the engine stops.

Lubricating oil indicator 13 The lubricating oil indicator 13 is energized by the first level signal and second level signal from the control device 12, and the first level signal is energized.
The light is turned on throughout the level and the second level, but the lighting state (blinking) can also be changed for each level. Furthermore, sounds can also be added.

Electric Start Fuel Supply 5 The electric start fuel supply 5 is activated by a second level signal from the controller 12. The starting fuel adjustment device 5 will be explained in detail with reference to FIG. The starting fuel adjustment device 5 has functional members such as a starting sliding valve, a starting fuel nozzle, and a needle valve installed in a housing, and mainly includes an operating part 5a that supplies an air-fuel mixture at the time of starting, and a temperature sensor. , a temperature sensing drive unit 5b that drives the slide valve, and a power supply unit 5c that sends a drive current to the temperature sensing drive unit 5b.

First, the actuating section 5a includes a housing 15,
The housing 15 includes a starting slide valve 16, a starting fuel nozzle 17, and a needle valve 18. The housing 15 has two circular holes 20, 2 with a step inside.
1 are vertically arranged on the same axis. Large diameter upper circular hole (sliding hole)
20, an inflow passage 22 and an outflow passage 23 are opened in communication with each other, and the slide valve 16 is slidably guided on the inner peripheral surface of the circular hole 20 so as to be vertically movable.
Intermittent communication of 3. A fuel inlet 24 is provided at the bottom of the small-diameter lower circular hole 21 . Therefore, the inflow passage 22 is connected to a starting intake passage 25 that merges with the intake passage 4.
The outflow passage 23 communicates with the downstream side, and the fuel inlet 24 communicates with the starting emulsion passage 26.
communicate with. The carburetor 3 is composed of a carburetor main body 3a and a float chamber body 3b which is arranged to define a float chamber 27 at the lower part of the carburetor main body 3a. The housing 1
5 has these passage parts 2 at the joint part with the carburetor main body 3a.
2, 23, and 24 via appropriate O-rings and are fixed to the carburetor main body 3a by mounting screws (not shown).

Next, the temperature sensing drive unit 5b includes a temperature sensor 31 including a piston 30 that expands and contracts depending on the temperature, a PTC type heater 32 provided integrally with the temperature sensor 31, and a 30 comes into contact with the set collar 33, a wax collar 34 that holds the temperature sensor 31 and guides the movement of the set collar 33, and a spring 35 that is interposed between the set collar 33 and the wax collar 34. The lower end of the wax collar 34 is fitted into a socket on the upper part of the housing 15 to fix the part 5b. set color 33
The lower portion of the starter releasably engages the starting slide valve 16 described above. Wax is contained within the temperature sensor 31, and as this wax expands in response to a rise in temperature, the piston 30 is actuated to extend. Due to the spring biasing force of the spring 35,
The set collar 33 is biased toward the temperature sensor 31, 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, and 38 is a cap. Inside the wax holder 37 are a pair of terminals 4.
0 and 41 are embedded, and these terminals 40 and 41 are connected to both ends of the PTC type heater 32, respectively.

These terminals 40 and 41 are led out from the holder cap 38 via conductive wires and connected to the power supply section 5c. That is, one terminal 40 is connected to the switch 4
3 to the charging generator coil 4 in the alternator 44
5, and the other terminal 41 is grounded. The ignition generator coil 46 of the alternator 44 is connected to the ignition device 4
7, and this ignition device 47 is connected to a battery 50 via a main switch 48 and a fuse 49. Further, the charging generating coil 45 is connected to the battery 5.
0, it is connected to the connection point of the main switch 48 and fuse 49 via a diode 51. The switch 43 is normally closed, but the control device 1
When the second level signal is output from 2, it becomes open and the PTC
Power to the mold heater 32 is cut off.

The oil drain prevention device of this embodiment constructed as described above operates as follows. When the remaining amount of lubricating oil in the lubricating oil tank 7 reaches the first level, the signal is sent to the control device 12.
When the determination is made, the circuit of the lubricating oil indicator 13 is closed, the indicator is displayed blinking, and a notification is issued. Needless to say, if the lubricating oil is replenished at this point and the remaining amount of lubricating oil returns to its original level, the circuit of the lubricating oil indicator 13 will open and the light will go out.

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

By cutting off the power to the starting fuel supply device 5, the starter valve opens and excess air-fuel mixture is sent to the engine 1. As a result, the rotation of the engine 1 no longer follows the opening degree of the throttle valve. That is, while the engine 1 is operating, the alternating current generator 44 is also operating, and the power from the alternating current generator 44 causes the PTC type heater 32 to generate heat, causing the wax to expand and the piston 30 to extend, thereby opening the sliding throttle valve. 16 is pushed downward, and the inflow passage 22 and outflow passage 23 of the starting intake passage 25 are cut off, so that 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 heater 32 stops generating heat and the wax is cooled to ambient temperature, so that the wax gradually contracts. 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 degree of the throttle valve 16 flows in through the starting intake passage 25. A rich air-fuel mixture is formed by the air and the fuel that flows in from the passage 22 and sucked out from the starting fuel nozzle 17 due to the circulation of this air, and the rich air-fuel mixture flows through the outflow passage 23 and the starting air intake path 25. and is discharged to the intake manifold 2. Therefore, excessive air-fuel mixture is supplied to the engine 1, resulting in engine malfunction, and the engine stops before the remaining amount of lubricating oil reaches zero.

(Other Embodiments) In the above embodiments, the detector 11
The control device 12 distinguishes the signal from the lubricant into a first level and a second level, outputs a first level signal and a second level signal, and flashes a lubricant indicator. However, such a lubricant indicator is not necessarily provided. There's no need. Further, in the above embodiment, an electric motorcycle starter is used as the starting fuel adjustment device, but it is not necessarily limited to this, and a conventionally known electric auto choke or the like may be used.

C. Effects of the Invention According to the present invention, if the engine continues to be operated ignoring the flashing display of the lubricating oil indicator, the device of the present invention forcibly stops the engine, thereby completely preventing the engine from seizing up due to running out of lubricating oil. can be prevented. Further, in the device of the present invention, since the valve of the starting fuel supply passage in the motorcycle starter gradually opens, the drive quality gradually deteriorates.
It is possible to make the user aware of the decrease in the amount of lubricant remaining.

[Brief explanation of the drawing]

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

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1...2-cycle internal combustion engine, 2...Intake manifold, 3...Carburizer, 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 (3)

[Claims] [Claim 1] Separate oil supply type 2-cycle comprising a mixture supply system having a carburetor with an electric starting fuel adjustment device and a lubricating oil supply system having a detector for detecting the remaining amount of lubricating oil in a lubricating oil tank. A two-stroke internal combustion engine, characterized in that when the remaining amount of lubricating oil reaches a low level, the starting fuel adjustment device is operated in response to a signal from the detector to supply excess fuel to the mixture supply system. Lubricating oil running out prevention device. 2. The signal from the detector is transmitted to the first
The first level signal and the second level signal are outputted respectively, and the lubricating oil indicator is blinked by the first level signal and the second level signal, and the electric 2. The lubricating oil shortage prevention device for a two-stroke internal combustion engine according to claim 1, wherein the device shuts off power to the starting fuel adjustment device. 3. Preventing running out of lubricating oil in a two-stroke internal combustion engine according to claim 1 or 2, wherein the electric starting fuel adjustment device is an electric motorcycle starter or an electric auto choke. Device.