JPH0619772Y2 - Lubricating oil supply device for separate refueling two-cycle engine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a lubricating oil supply apparatus for a two-cycle engine with separate oil supply used for outboard motors and the like.

[Prior Art] Generally, in this type of lubricating oil supply device, lubricating oil supplied from an oil tank is passed through an oil guide path, and the lubricating oil in the oil guide path is an oil pump for an intake manifold of a two-cycle engine. A check valve for oil is provided in an oil guide line that is supplied into the oil passage and is located downstream of the oil pump. In such a lubricating oil supply device, if the oil check valve is clogged, the oil pump fails, or the oil in the oil tank is exhausted, and the lubricating oil is no longer supplied to the two-cycle engine, the engine will burn. Trouble such as sticking occurs.

In order to prevent such engine trouble, conventionally, an oil presence / absence detector for detecting whether or not lubricating oil is present in the oil guide path is arranged near the engine in the oil guide path. When the presence / absence detector detects the condition that the lubricating oil is not present in the oil passage, it issues an alarm to the driver or controls the engine to misfire.

The oil presence / absence detector has a light emitter and a light receiver, and a part of the oil guide path is used as a transparent tube so that light from the light emitter is transmitted through the transparent tube and then received by the light receiver. .
As described above, in the oil presence / absence detector having the transparent tube, the light emitter, and the light receiver, the amount of light received by the light receiver is different when the lubricating oil is present in the transparent tube and when the transparent tube is empty. The presence or absence of lubricating oil in the oil guide is detected by the change in the amount.

[Problems to be Solved by the Invention] However, in such a conventional lubricating oil supply device for a separated refueling type two-cycle engine, for example, the oil pump may malfunction, or the check valve for oil in the oil conduit may become clogged. Even if the lubricating oil is no longer supplied into the intake manifold of the two-cycle engine, the lubricating oil remains in the oil passage, so the oil presence / absence detector has oil, that is, the lubricating oil is not supplied. There was a problem that it was judged that it was done.

The purpose of the present invention is to prevent the lubrication oil from leaking due to the failure of the oil pump, the clogging of the oil check valve in the oil passage, etc.
It is an object of the present invention to provide a lubricating oil supply device for a separated refueling type two-cycle engine that can correctly detect the supply stop of the lubricating oil when the supply to the intake manifold of the cycle engine is stopped.

[Means for Solving the Problems] The structure of the present invention for achieving the above object will be described with reference to FIG. 1 and FIG. 2 corresponding to the embodiments. The oil tank 1, the oil pump 2 that pumps the lubricating oil from the oil tank 1 through the oil guide path 3, and the oil guide path 3 that is disposed downstream of the oil pump 2 and supplies the lubricating oil to the oil pump 2 side. An oil check valve 7 for preventing backflow and the presence / absence of oil arranged in the oil guide path 3 downstream of the oil check valve 7 for detecting whether or not lubricating oil is present in the oil guide path 3. The lubricating oil pumped out from the oil tank 1 is provided with the detector 9 and is supplied to the intake manifold 6 communicating with the crankcase 5 through the oil guide path 3 in a separated refueling type two cycle organ In the lubricating oil supply device, the oil return path 3 between the oil check valve 7 and the oil presence / absence detector 9 and the inside of the crankcase 5 are connected by the fuel return guide path 10, and the fuel return guide path 10 In order to prevent the lubricating oil from entering the crankcase 5 through the fuel return conduit 10 and to prevent the atomized fuel supplied into the fuel return conduit 10 from flowing back into the crankcase 5. A check valve 11 for fuel is arranged.

[Operation] By doing so, the pressure in the crankcase 5 is applied to the oil guide path 3 via the fuel return guide path 10, and the lubricating oil is forcedly blown into the intake manifold 6 by the pressure.

Therefore, even when the oil pump 2 fails, the check valve 7 for oil in the oil guide path 3 is clogged, and the lubricating oil is no longer supplied into the intake manifold 6 of the two-cycle engine 4, Lubricating oil staying in the conduit 3 is pumped by the pressure in the crankcase 5 and sent into the intake manifold 6, and the oil presence / absence detector 9 detects the absence of oil, thus preventing erroneous detection. .

Further, at this time, the lubricating oil is taken in by the intake manifold 6
If the lubricating oil is blown into the inside, the lubricating oil can be easily atomized, and the engine 4 can be satisfactorily lubricated.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

The lubricating oil supply apparatus according to the present embodiment includes an oil tank 1 that contains the lubricating oil and an oil pump 2 that pumps the lubricating oil from the oil tank 1. The oil tank 1 and the oil pump 2 are connected by an oil guide path 3 formed of an oil conduit, and the intake manifold 6 communicating with the oil pump 2 and the crankcase 5 of the engine 4 is also connected by the oil guide path 3. It is in communication. On the downstream side of the oil pump 2 in the oil guide path 3, an oil check valve 7-branch pipe 8-oil presence / absence detector 9 are connected in this order toward the downstream side.

The oil check valve 7 is adapted to prevent backflow of lubricating oil to the oil pump 2 side.

The branch pipe 8 has two connection ports 8 connected to the oil guide path 3.
In addition to A, it has one branch pipe 8B.

One end of a fuel return conduit 10 formed of a fuel return conduit is connected to the branch pipe 8B, and the other end of the fuel return conduit 10 is connected to the crankcase 5. This fuel return conduit 1
The oil guide path 3 and the inside of the crankcase 5 communicate with each other by 0.

A portion of the atomized fuel supplied into the fuel return guide passage 10 is prevented from flowing back into the crank case 5 near the crankcase 5 of the fuel return guide passage 10, or lubricated from the oil guide passage 3. A fuel check valve 11 is arranged to prevent oil from directly flowing into the crankcase 5.

The oil presence / absence detector 9 has a transparent tube 9A forming a part of the oil guide path 3, and lubricating oil passes through the transparent tube 9A. The transparent tube 9A is embedded in the base portion 9B so as to prevent light from entering from the outside, and the base portion 9B has a light emitter housing hole 9C and a light receiver housing hole 9D whose axes are orthogonal to the axis of the transparent tube 9A. Are formed. The light emitter housing hole 9C and the light receiver housing hole 9D are the transparent tube 9
Centering around A, the respective axes extend in opposite directions. A light emitter 9E such as a light emitting diode is housed in the light emitter housing hole 9C, and a light receiver 9F such as a photodiode is housed in the light receiver housing hole 9D.

The oil presence / absence detector 9 configured as described above is a transparent tube 9
Refractive index of light transmitted through the transparent tube 9A when lubricating oil is present in A, and refractive index of light transmitted through the transparent tube 9A when lubricating oil is not present in the transparent tube 9A By utilizing the difference between and, the light receiving body 9F receives the light from the light emitting body 9E when the lubricating oil is present in the transparent tube 9A or when the lubricating oil is not present in the transparent tube 9A. Is set to. In the oil presence / absence detector 9 of the embodiment shown in FIG. 2, the light receiving body 9F is set to receive the light from the light emitting body 9E when the lubricating oil does not exist in the transparent tube 9A. The absence of lubricating oil in the pipe 9A is detected. Therefore, when the light receiver 9F does not receive the light from the light emitter 9E, it means that the lubricating oil exists in the oil guide path 3.

Next, the operation of each component in the lubricating oil supply system of the above embodiment when the engine 4 is started and lubricating oil is flowing in the oil guide path 3 will be described. Oil pump 2
Lubricating oil sent from the oil passes through the oil check valve 7, and here the lubricating oil is prevented from flowing back to the oil pump 2 side in the oil guide path 3. Next, the lubricating oil passes through the branch pipe 8 and is supplied to the oil presence / absence detector 9. At this time, when the lubricating oil is supplied to the oil presence / absence detector 9, the inside of the transparent tube 9A is filled with the lubricating oil and the light from the light emitting body 9E is not received by the light receiving body 9F (see the alternate long and short dash line in FIG. 2). ). Therefore, in this state, the presence / absence of the oil detector 9 means that the lubricating oil is flowing in the oil guide path 3, so that the driver of the engine 4 is alerted,
It is not necessary to control the engine 4 for misfire. At this time, when the pressure in the crankcase 5 is positive, part of the atomized fuel in the crankcase 5 is supplied from the branch pipe 8B of the branch pipe 8 into the oil guide passage 3 through the fuel return guide passage 10. It Further, when the pressure in the crankcase 5 becomes negative, the fuel return conduit 10
The fuel check valve 11 prevents the atomized fuel present therein or the lubricating oil present in the oil conduit 3 from attempting to enter the crankcase 5 through the fuel return conduit 10. When the atomized fuel in the crankcase 5 is supplied to the oil guide path 3 when the pressure in the crankcase 5 is positive,
Fuel having a low viscosity can be mixed with the lubricating oil to lower the viscosity of the lubricating oil and improve the fluidity and atomization of the lubricating oil.

In addition, the crankcase 5 and the oil guide path 3 are returned to the guide path 10
When connected by, the pressure in the crankcase 5 is applied to the oil guide path 3, and the lubricating oil can be blown into the intake manifold 6 vigorously by the pressure to easily atomize the lubricating oil.

Next, in the lubricating oil supply system according to the above-described embodiment, the check valve for oil 7 in the middle of the oil guide path 3 while the engine 4 is operating.
The operation of each component when the lubricating oil is not flowing in the oil guide path 3 due to clogging of the oil pump, failure of the oil pump 2 or exhaustion of oil in the oil tank 1 will be described.

Also in this case, the lubricating oil staying in the oil guide path 3 is pumped by the pressure in the crankcase 5 and sent into the intake manifold 6. Therefore,
In the transparent pipe 9A of the oil presence / absence detector 9, only the atomized fuel returned from the inside of the crankcase 5 exists or is in an empty state. In this way, the transparent tube 9 of the oil presence detector 9
When there is no lubricating oil in A, the transparent tube 9A
The refractive index of the light from the light-emitting body 9E that passes through the transparent tube 9A becomes lower than that when the lubricating oil is filled in the interior, and the light-receiving body 9F receives the light (see the broken line in FIG. 2), and the oil. It is detected that the lubricating oil is not flowing in the conduit 3.
At this time, a warning is given to the driver of the engine 4 or misfire control of the engine 4 is performed.

The check valve 7 for oil and the check valve 11 for fuel in the above embodiment respectively bias the balls in a predetermined direction by springs as shown in FIG. 1, but the present invention is not limited to this. Instead of this, for example, a check valve using a reed valve may be used.

[Effects of the Invention] As described above, in the lubricating oil supply device for the separate oil supply type two-cycle engine according to the present invention, the oil guide path between the oil check valve and the oil presence / absence detector and the inside of the crankcase are provided. Since the fuel return that communicates with each other has a conduit, the oil pump fails, the check valve for oil in the oil conduit is clogged, etc., and lubricating oil is not supplied to the intake manifold of the 2-cycle engine. Also, when the oil leaks, the lubricating oil staying in the oil conduit is pumped by the pressure in the crankcase and sent into the intake manifold, and the oil presence / absence detector detects that there is no oil. Can be prevented.

Further, when the atomized fuel in the crankcase is supplied into the oil passage through the fuel return passage, the low-viscosity fuel is mixed into the lubricating oil to reduce the viscosity of the lubricating oil, and thus the lubricating oil. The fluidity and atomization of the can be improved.

Furthermore, when the crankcase and the oil guide path are connected by the fuel return guide path, the pressure in the crankcase is applied to the oil guide path, and the lubricating oil can be vigorously blown into the intake manifold by this pressure. The lubricating oil can be easily atomized, and the engine can be satisfactorily lubricated.

[Brief description of drawings]

FIG. 1 is a partial explanatory view showing a lubricating oil supply apparatus according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view taken along line II-II of the oil presence / absence detector shown in FIG. 1 ... Oil tank, 2 ... Oil pump, 3 ... Oil conduit (oil conduit), 5 ... Crankcase, 6 ... Intake manifold, 7 ... Check valve for oil, 9 ... Oil presence / absence detector, 9A ... Transparent tube, 9E ... light emitter, 9F ... light receiver, 1
0 ... Fuel return conduit (return conduit), 11 ... Fuel check valve.

Claims (1)

[Scope of utility model registration request] 1. An oil tank for containing lubricating oil, an oil pump for pumping the lubricating oil from the oil tank through an oil conduit, and an oil pump disposed on the oil conduit downstream of the oil pump. Check valve for oil that prevents the reverse flow of oil to the oil pump side, and whether the lubricating oil is present in the oil guide path, which is located downstream of the oil check valve for oil. An oil presence / absence detector for detecting whether or not there is provided, and the lubricating oil pumped out from the oil tank is supplied to the intake manifold communicating with the crankcase via the oil conduit. In a lubrication oil supply device for a separate oil supply type two-cycle engine, the oil guide path between the oil check valve and the oil presence detector and the crank The inside of the case is communicated with a fuel return guideway, and in the middle of the fuel return guideway, the lubricating oil that tries to enter the crankcase through the fuel return guideway is blocked or the fuel return guideway is provided. A lubrication oil supply device for a separated refueling type two-cycle engine, characterized in that a fuel check valve for preventing the atomized fuel supplied to the crankcase from flowing back into the crankcase is arranged.