JPS6350522B2 - - Google Patents

Abstract

PURPOSE:To make it possible to facilitate the change of lubrication system by providing an oil feeding pump formed by a pulsating pump operating by the internal pressure of a crankcase and a gasoline pump in a fuel chamber of a carburettor. CONSTITUTION:A choke valve 3 and a throttle valve 5 are disposed in a carburettor passage 2. A fuel chamber 6 is provided at one side of the main carburettor body 1 and is communicated with a Venturi 4 through a fuel jet 7. The oil feed pump 19 and the gasoline feed pump 20 are communicated with the supply passage 13 of a fuel chamber 6. The supply of oil and gasoline to the fuel chamber 6 is performed by the pumping operation of diaphragms 24 and 29 due to the internal pressure variation (pulsation) of the crankcase. By this procedure, since either of the oil pump 19 and the fuel pump 20 has no mechanical connection, the change of the lubrication system can be readily performed.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an oil supply device for an internal combustion engine mainly used in motorcycles, automobiles, general-purpose engines, and the like.

[Conventional technology]

In this type of internal combustion engine, there are two ways of supplying lubricating oil to the engine body. One is a separate oil supply system, in which lubricating oil is generally pumped directly from the oil tank to the required parts of the engine body, and the pump is designed to obtain driving force from the crankshaft. The type of refueling is uniquely determined at the engine design stage. In addition, there is also the same type of separate oil supply as disclosed in, for example, Japanese Utility Model Application No. 53-64847. Here, lubricating oil is released into the air-fuel mixture downstream of the throttle valve of the carburetor. Although this form looks like separate oil supply, it is functionally similar to mixed oil supply where gasoline and lubricating oil are mixed and supplied to the carburetor. As a form of mixed oil supply, the one described in Japanese Utility Model Application Publication No. 158911/1983 is known. Here, a gasoline supply source and a lubricating oil supply source are connected to the inlet side of a pulsating pump that operates using fluctuations in the internal pressure of the crankcase, as adopted in the above-mentioned Japanese Utility Model Publication No. 53-64847. are doing. In such a configuration, since the pump structure is separated from the engine, from the case where it is used as a form of mixed oil refueling as described above, to the case where it is used as a form of mixed oil refueling as described above, it is used for lubrication in a system separate from the gasoline supply to the combustion chamber of the carburetor. It has the condition that it can be easily converted to a form of separate oil supply to achieve oil supply.

[Problem that the idea aims to solve]

However, since the viscosity of lubricating oil is extremely high compared to the viscosity of gasoline, the ratio of suction by the suction force of the pump is overwhelmingly larger on the gasoline side. If the suction force changes, the lubricating oil cannot be mixed into the gasoline as necessary and sufficiently, and the proportion of the lubricating oil also changes as the suction force changes. The present invention is a versatile gasoline and lubricating oil supply form that can be applied to both separate lubrication and mixed oil supply.
It is an object of the present invention to provide an oil supply device for an internal combustion engine having a structure that can easily and stably mix lubricating oil with gasoline at a required ratio even in mixed oil supply.

[Means to solve the problem]

For this reason, in the present invention, in an internal combustion engine that supplies gasoline to the combustion chamber of a carburetor by a pulsating pump operated by internal pressure fluctuations in the crankcase, a supply path for supplying gasoline from the pulsating pump to the combustion chamber is provided. , communicates with the discharge side of another pulsating pump that is activated by fluctuations in the internal pressure of the crankcase, and
The pulsating pump is configured to supply engine lubricating oil.

[Effect]

Therefore, since a pulsating pump can be used to supply both gasoline and lubricating oil, it is used in the form of a separate lubrication system in which gasoline is supplied to the combustion chamber of the carburetor and lubricating oil is supplied through a separate system. In the engine, it is easy to supply lubricating oil to the supply path that supplies gasoline to the combustion chamber, and it is possible to convert it to a mixed oil refueling system. Since the lubricating oil is forcibly supplied to the gasoline supply path by a pulsating pump different from the pulsating pump for supply, it is possible to easily and stably mix the lubricating oil with the gasoline at the required ratio.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In the figure, reference numeral 1 is a carburetor main body, and a carburetor passage 2 has one end communicating with an air cleaner and the other end communicating with an intake passage of the engine. 3, a ventilator 4, and a throttle valve 5 are provided. A fuel chamber 6 provided on one side of the carburetor body 1 is communicated with a ventilate 4 via a fuel jet 7, and a diaphragm 8.
Equipped with: A presser 9 is attached to the center of the diaphragm 8, and a spring 10 is attached to the diaphragm 8.
The lever 12 is in contact with a lever 12 which is resiliently supported clockwise about the pivot 11. A valve rod 14 is inserted into the supply passage 13 of the fuel chamber 6, and its lower end is in contact with the opposite end of the lever 12. The valve body 15 at the top of the valve rod 14 is adapted to come into contact with a valve seat 16 provided in the supply passage 13 from below, and due to the internal pressure caused by the fuel in the fuel chamber 6, the valve body 15 is placed in the supply passage. 13 is opened and closed, and when its internal pressure increases, the diaphragm 8 descends and the lever 12 rotates, pushing up through the valve rod 14. When the internal pressure decreases, the diaphragm 8 and lever 12 move double and lower. Ru. An oil supply pump 19 and a gasoline supply pump 20 are communicated with the inlet of the supply passage 13 via conduits 17 and 18 having control valves 34 and 35, respectively, and communicated with an oil tank and a fuel tank, respectively. ing. The oil supply pump 19 has a pump chamber 23 equipped with a one-way valve 21 on the oil inlet side and a one-way valve 22 opposite to the above on the oil outlet side, and a diaphragm 24 is installed in this pump chamber. The internal pressure of the crankcase is applied to the corresponding diaphragm chamber 25. Similarly to the above, the gasoline supply pump 20 is provided with one-way valves 26 and 27 on the fuel introduction side and fuel outlet side, and a diaphragm 29 in the central pump chamber 28, and a corresponding diaphragm chamber 30 is provided with the internal pressure of the crankcase. The configuration is such that In addition, in the figure, numeral 31 is a relief valve provided in the fuel chamber 6, and numeral 32 is a spring 3.
By pushing the Teikura push tool at the time of start-up, the lever 12 is pressed against the spring 10 via the diaphragm 8 while contacting the pusher 9.
The valve body 15 is separated from the valve seat 16 to forcibly open the supply passage 13, and the relief valve 31 is pushed up and relieved. As a result, the fuel chamber 6 is filled with fuel. Moreover, the relief valve 31 serves as an overflow hole at the time of overflow. In such a configuration, the supply of oil and gasoline to the fuel chamber 6 is achieved through a pumping action by operating the diaphragms 24 and 29 due to internal pressure fluctuations (pulsations) in the crank chamber. In this case, the oil and gasoline supply amounts are adjusted by control valves 34 and 35. Therefore, oil and gasoline are supplied in proportion to the engine speed. Inside the carburetor, the intake negative pressure applied to the ventilate 4 varies depending on the opening degree of the throttle valve 5, and the mixed fuel in the fuel chamber 6 is supplied via the fuel jet 7. In this case, the oil and gasoline can be mixed separately from the control valves 34 and 35 by appropriately selecting the pump capacities of both pumps 19 and 20 in advance, or by adjusting the degree of pressure exerted by the crankcase internal pressure on each diaphragm. The amount can basically be set. For example, it is easy to set the target value to 1:20 to 25. Further, the ratio of the mixing amount may be changed between low-speed operation and high-speed operation. For example, it would be good to have a width of about 1:40 to 1:15. FIG. 2 shows a separate refueling mode in which gasoline is supplied to the fuel chamber 6 of the carburetor 1 through the supply path 18 by an external gasoline pump, for example, the same pulsating pump 20 as in the above-described embodiment. This figure shows an example of application of the present invention to an engine. Here, by only partially changing the supply path 18, the pulsating pump 19 shown by the imaginary line can be connected to the above-mentioned supply path 18 via the supply path 17, and thereby the mixed oil supply as shown in FIG. It can be in the form of In this case, it is sufficient to simply close the lubricating oil path that has been supplied separately. In this way, it is possible to easily change from the separated oil supply mode to the mixed oil supply mode.

【Effect of the invention】

As is clear from the above description, the present invention has an oil and gasoline supply path equipped with an oil supply pump consisting of a pulsating pump operated by internal pressure fluctuations in the crankcase, and a gasoline supply pump. (a) It is possible to easily change the refueling mode from a separate refueling mode to a mixed oil refueling mode without changing the engine structure and by adding or changing a few parts. (b) Furthermore, since pumping is performed in accordance with internal pressure fluctuations in the crankcase chamber, the oil supply amount and gasoline supply amount are controlled in relation to the engine speed. (c) The mixture ratio of oil and gasoline can be appropriately set, and if necessary, the ratio can be easily controlled as necessary. You can expect excellent effects such as:

[Brief explanation of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention;
FIG. 2 is a longitudinal side view for explaining functions. 1...Carburetor body, 2...Carburetor passage,
3...Chiyoke valve, 4...Benturey, 5
... Throttle valve, 6 ... Fuel chamber, 7 ... Fuel jet, 8 ... Diaphragm, 9 ... Pressure element, 10 ... Spring, 11 ... Pivot, 12 ...
... Lever, 13 ... Supply passage, 14 ... Valve rod, 1
5... Valve body, 16... Valve seat, 17, 18... Pipe line, 19... Oil supply pump, 20... Gasoline supply pump, 21, 22... One-way valve, 2
3...Pump chamber, 24...Diaphragm, 25...
...Diaphragm chamber, 26, 27...One-way valve, 28...Pump chamber, 29...Diaphragm,
30...Diaphragm chamber, 31...Relief valve, 32...Teikura push tool, 33...Spring.

Claims (1)

[Claims] 1. In an internal combustion engine that supplies gasoline to the combustion chamber of a carburetor by a pulsating pump that is activated by fluctuations in the internal pressure of the crankcase, a supply path that supplies gasoline from the pulsating pump to the combustion chamber is connected to the fluctuations in the internal pressure of the crankcase. 1. An oil supply device for an internal combustion engine, characterized in that the oil supply device for an internal combustion engine is configured to communicate with the discharge side of another pulsation pump operated by the pulsation pump, and to supply engine lubricating oil to the pulsation pump.