JPH0547314U - Lubrication mechanism in engines for portable work machines - Google Patents

Abstract

(57) [Summary] [Purpose] A certain proportion of lubricating oil is mixed with the fuel supplied to a four-cycle engine, and the mixed gas is supplied to the combustion chamber through the carburetor and the crank chamber. In the meantime, the piston, the cylinder wall, the crank chamber inner wall, the crankshaft support bearing, etc. can be lubricated to use the four-cycle engine as a portable working machine engine. A suction port 14 and a discharge port 15 are opened in a crank chamber, a gas valve 20 is provided in the suction port 14, and
The carburetor 11 is provided, and the suction port 14 and the discharge port 15 are connected by a connecting pipe A16, and the butterfly 21
And a connecting pipe B17 from the discharge port 15 to the combustion chamber 7.
Are connected to supply the mixed gas from the vaporizer 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an engine for a portable work machine in which a certain proportion of lubricating oil is mixed in the fuel of a four-cycle engine for driving a portable work machine to lubricate a required lubrication portion of the engine. The lubrication mechanism.

[0002]

[Prior Art]

 Conventionally, portable work machines such as chain saws require a lightweight, small size, and high output, so a 2-cycle engine is mainly used, but a 4-cycle engine originally has a clean exhaust gas and consumes less fuel. Since it has various advantages such as a small number, it is desirable to use it, but it lacks an effective lubrication method and mechanism, which hinders its practical use. That is, in order to lubricate the pistons, cylinders, etc., it is necessary to fill the crankcase with a certain amount of liquid lubricant, and an oil reservoir for the lubricant must be provided. The volume and volume of the engine are larger than those of a 2-cycle engine.

[0003]

[Problems to be solved by the device]

 Therefore, the present invention has been made in view of the above-mentioned problems of the conventional technology, in which the fuel supplied to the four-cycle engine is mixed with lubricating oil in a certain proportion, and the mixed gas of the mixed oil is used as the crank gas. Passing through the chamber and entering the combustion chamber, the piston, cylinder inner wall, crankshaft support bearing, etc. are lubricated with the lubricant contained in the mixed gas, facilitating lubrication within the 4-cycle engine. The purpose is to develop a lubrication mechanism for portable work machines that can be made smaller and lighter.

[0004]

[Means for Solving the Problems]

 That is, the present invention provides a carburetor for mixing a certain proportion of lubricating oil in fuel supplied to a four-cycle engine in a crank chamber of the engine, and then supplying the fuel from the carburetor to the crank chamber. And to lubricate a required lubrication portion in the engine in the process of passing through the crank chamber to the combustion chamber through the pressure change in the crank chamber caused by the reciprocating motion of the piston. It is intended to achieve the above purpose.

[0005]

[Action]

 According to the present invention, a certain proportion of lubricating oil is mixed in the fuel supplied to the 4-cycle engine, for example, the lubricating oil is mixed at a ratio of 1 with respect to the fuel 50, and the mixture is guided to the carburetor via the fuel inlet. Further, when it is guided to the intake port facing the crank chamber, the inner wall of the crank chamber and the web portion of the crankshaft are brought as close as possible to each other, and the volume of the crank chamber increases in the upward stroke of the piston, so the fuel vaporizes. By the action of the device, the air-fuel mixture mixed with the intake air enters the intake port, and the gas valve rotatably arranged in the intake port controls the amount of the mixed gas depending on the engine load condition. Furthermore, since the piston is a 4-cycle engine when the piston enters the descending stroke, the intake valve may be open or closed. Therefore, when the valve is opened, the web portion acts to disconnect the port from the crank chamber, and the mixed gas enters the combustion chamber from the cylinder head port through the connecting pipe, ignites and burns, and is discharged from the exhaust port. . On the other hand, when the piston enters the descending stroke, when the intake valve closes, the mixed gas is stored in both connecting pipes and the crank chamber, and then enters the combustion chamber in the next stroke. Further, the relation between the butterfly provided on the connecting pipe A and the gas valve is that the gas pressure in the suction port can be reduced by fully opening the butterfly when the output is not needed and opening the gas valve slightly. Is reduced and becomes almost the same as the pressure in the connecting tube B, so that the pumping action of the web portion is reduced. Also, during engine operation, the butterfly is almost fully open, the gas valve is fully closed, and the gas pressure supply in the connecting pipe B becomes higher than the gas pressure in the intake port, so the amount of intake gas increases as described above. Be effective. As described above, the mixed gas containing the lubricating oil in the fuel passes through the crank chamber and enters the combustion chamber.Therefore, the piston, the inner wall of the cylinder, the crankshaft support bearings, etc. are made of the lubricant contained in the mixed gas. Will be lubricated by. Further, in the reed valve type, a reed valve on the suction side and a reed valve on the discharge side are provided so as to face the crank chamber, and lubrication can be performed instead of the control by the crank web portion.

[0006]

【Example】

 In order to further clarify the gist of the present invention, one embodiment will be described with reference to the drawings. First, the first embodiment will be described with reference to FIG. 1 is the center of rotation of the crankshaft, 2 is the center of the crankpin of the crankshaft, 3 is the arm of the crankshaft, 4 is the connecting rod, 5 is the center of the pin of the piston 6, and 7 is the combustion chamber. Reference numeral 8 is an intake valve, 9 is an exhaust valve, and 10 is a valve chamber provided with a mechanism for driving the intake and exhaust valves 8 and 9, although not shown. A vaporizer 11 has an air suction port 12 and a fuel suction port 13 and is communicated with an intake port 14 facing the crank chamber. The exhaust port 15 faces the intake port 14 and the discharge port 15 is cranked. It is opened to face the chamber and is designed to discharge the mixture. Reference numeral 16 is a connecting pipe A that connects the discharge port 15 and the suction port 14, 17 is a connecting pipe B that connects the discharge port 15 and the suction port 18 of the cylinder head, 19 is an exhaust port, and 20 is a gas valve. , 21 are butterfly valves provided in the connecting pipe A, and the gas valve 20 and the butterfly 21 are connected so that when one of them is opened, the other is closed. Further, a lubricating material such as a grease material is enclosed in the valve chamber 10 so as to lubricate each component in the chamber independently of other parts of the engine. With this configuration, the mixed gas containing the lubricating oil in the fuel controls the mixed gas amount according to the load state of the engine and enters the combustion chamber, so that the piston 6, the inner wall of the cylinder, and the crankshaft. The supporting bearings are lubricated by the lubricant contained in the mixed gas.

Next, a second embodiment will be described with reference to FIG. Similar to the first embodiment, 1 is the center of the crankshaft, 2 is the center of the crankpin of the crankshaft, 3 is the arm of the crankshaft, 4 is the connecting rod, 5 is the center of the piston 6, 7 is the combustion chamber, 8, Reference numeral 9 is an intake / exhaust valve which is arranged to be opened and closed by a valve drive mechanism (not shown). An intake port 14 is provided so as to open into the crank chamber, and an intake side reed valve 24 is provided therein, and fuel is supplied into the crank chamber through the intake side reed valve 24. To this end, a vaporizer (not shown) is provided, a discharge port 26 is provided in the crank chamber facing the suction side reed valve 24, a discharge side lead valve 25 is disposed there, and further connected to a connecting pipe 27. A crank alarm that connects the crankshaft center 1 and the crankpin center 2 is provided by providing an intake pot 28 at the other end to supply the combustion chamber 7 through the intake port 18, the intake valve 8 and the like. The rotation of the crankshaft consisting of 3 and 3 causes the intake and exhaust valves 8 and 9 to open and close together with the vertical movement of the piston 6 connected at the piston center 5 via the connecting rod 4, and to the state of the mechanical load. When the crank chamber pressure fluctuates, a mixed gas of fuel mixed with lubricating oil enters the crank chamber from the suction side reed valve 24 side, lubricates a required part, and further, through the discharge port 26, the discharge side reed valve. 25, it passes through the connecting pipe 27 and is stored in the suction pot 28, where it is pressurized and stored, and since it is a 4-cycle engine, fresh air enters the combustion chamber 7 through the intake valve 8 every two revolutions. Inhaled under pressure.

In the above embodiment, the case where the crankcase is lubricated with an independent lubricant by using a mixed gas containing a certain proportion of lubricating oil in the fuel has been described. Therefore, it is possible to arbitrarily change, and the specific shapes and configurations of the other parts are not limited to the above-mentioned embodiment, and the above-mentioned purpose and operation of the present invention described above and the following will be described. It is needless to say that the invention can be arbitrarily modified within a range in which the effect of the invention is achieved, and that none of these modifications change the gist of the invention.

[0009]

[Effect of the device]

 As described in detail above, the lubrication mechanism in the engine for a portable work machine according to the present invention is provided with a carburetor in the crank chamber for mixing the lubricating oil at a constant ratio in the fuel supplied to the four-cycle engine. Then, the mixed fuel is supplied into the crank chamber and is guided to the combustion chamber of the engine through the pressure change in the crank chamber due to the reciprocating motion of the piston, and the fuel is allowed to pass through the portion requiring lubrication. It is necessary to lubricate, and it is possible to improve the output by enabling supercharging by compressing the crank chamber, and because the carburetor is installed in the crank chamber, the installation position becomes lower and the head difference from the fuel tank becomes smaller. Therefore, when the membrane vaporizer is used, the fuel supply capacity increases, and the same fuel, that is, the mixture with the lubricating oil, is used in the field of portable work machines such as chain saws, which used to mainly use 2-cycle engines. use Can be, user without wrong maintenance, the exhaust gas is clean, less fuel consumption, becomes small, the lubrication mechanism of lightweight engine at high power. Furthermore, the lubrication mechanism of the present invention allows the crank chamber and the valve chamber to be separate lubrication systems, which has various unique effects such as a simplified structure. is there.

[Brief description of drawings]

FIG. 1 is a front view showing a main part of a first embodiment of the present invention.

FIG. 2 is a front view showing a main part of a second embodiment of the present invention.

[Explanation of symbols]

 1 Crankshaft Center 2 Crank Pin Center 3 Crank Arm 4 Connecting Rod 5 Piston Center 6 Piston 7 Combustion Chamber 8 Intake Valve 9 Exhaust Valve 10 Valve Room 11 Vaporizer 12 Air Suction Port 13 Fuel Suction Port 14 Suction Port 15 Suction Port Outlet 16 Connection pipe A 17 Connection pipe B 18 Intake port 19 Exhaust port 20 Gas valve 21 Butterfly 22 Web part 23 Crank inner wall 24 Suction side lead valve 25 Discharge side lead valve 26 Discharge port 27 Connection pipe 28 Inhalation pot

Claims (1)

[Scope of utility model registration request] 1. A carburetor for mixing a certain proportion of lubricating oil into fuel supplied to a 4-cycle engine is provided in a crank chamber of the engine, and the fuel is supplied from the carburetor into the crank chamber. In addition, in the process of passing through the crank chamber and guiding it to the combustion chamber through a pressure change in the crank chamber caused by the reciprocating motion of the piston, a lubrication required portion in the engine is lubricated. Lubrication mechanism in engines for portable work machines.