JPS6210405Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to an improvement of a lubrication device for a two-stroke engine.

(Problems to be solved by conventional technology and ideas) In recent two-stroke engines, a pump linked to the engine supplies lubricating oil in small amounts to the engine's intake holes and crank chamber to lubricate the engine. This eliminates the step of using a mixture of fuel and lubricating oil. However, if the engine is left unattended, the lubricating oil that has adhered to the cylinder walls will fall into the crank chamber.
Lack of lubricant on cylinder wall. Even if the engine is started and operated in this state, the lubricating oil in the crank chamber is not immediately agitated, so the lack of lubricating oil on the cylinder wall will continue for some time. Therefore, immediately after starting, the engine is cold and the inner diameter of the cylinder has shrunk, forcing the piston to move back and forth, resulting in scuffing. If scuffing occurs, it may cause abnormal noise when the piston reciprocates, which is inconvenient.

This invention is an improvement to prevent such inconvenient scuffing from occurring.

[Structure of the idea]

(Means for Solving Problems) The present invention provides a switching valve between the pump and the engine in a pump linked to the engine that supplies lubricating oil to the engine, and one outlet of the switching valve is connected to the engine. Connect it to the intake hole or crank chamber, and connect the other outlet to the oil filler port provided on the cylinder wall, connect the operation piece of the switching valve to the starter lever of the carburetor, and connect it to the cylinder wall when starting by operating the starter lever. It is characterized by allowing lubricating oil to flow through it. When the starter lever is operated, the switching valve is operated, and the other outlet of the switching valve communicates with the oil filler port provided on the cylinder wall, and lubricating oil is supplied to the cylinder wall at the same time as the engine starts. When you return the starter lever, the switching valve will switch.
Lubricating oil is now supplied to the intake air or crank chamber.

(Example) A pump 1 linked to the engine sends lubricating oil little by little to the intake hole 2 of the engine to lubricate the engine. This destination is not limited to the intake hole 2, but may also be sent to a crank chamber or the like. Lubricating oil mixes with gasoline in the crankcase and scatters to various parts of the engine. Accordingly, the present invention connects the outlet of the pump 1 with a switching valve 3 that switches the flow path in two directions. One outlet of the switching valve 3 is connected to the intake hole 2 through a pipe as before, and the other outlet is connected through a pipe to an oil filler port 5 provided in the cylinder wall 4. The operating piece 6 of the switching valve 3 is slid to switch the outlet, and is connected to the starter lever 10 that operates the plunger valve 9 that opens and closes the starter passage 8 of the carburetor 7 with a Bowden wire 11. It is designed to be linked. 12 is a return spring.

The effect will be explained.

When starting an engine that has been left cold, raise the plunger valve 9 with the starter lever 10.
A starter passage 8 of a carburetor 7 is opened to supply fuel richer than usual, so that the engine can be started easily. By this operation, the switching valve 3 is brought into communication with the oil filler port 5 of the cylinder wall 4, and when the engine starts rotating and the pump 1 starts to operate,
Lubricating oil is immediately sent to the cylinder wall 4. In this way, immediately after starting, lubricating oil is sent to the piston sliding surface of the cylinder wall 4, providing sufficient lubrication and preventing scuffing. When the engine is started and demodulated, the starter lever 10 is returned to close the starter passage 8. Along with this, the switching valve 3 is also switched, and lubricating oil comes to be sent to the normal intake hole 2 side.

[Effect of idea]

As explained above, this invention provides a switching valve between the pump and the engine in a system that supplies lubricating oil to the engine using a pump linked to the engine, and connects one outlet of the switching valve to the cylinder wall. The operating piece of the switching valve is connected to the provided lubrication port, and the operating piece of the switching valve is connected to the starter lever of the carburetor, so that lubricating oil flows to the cylinder wall at the time of starting by operating the starter lever, so the lubricating oil flows to the cylinder wall immediately after starting. is sent, and scuffing can be prevented. Furthermore, since the switching valve is linked to the starter lever of the carburetor, there is no need to operate it incorrectly.
In this way, only a small amount of lubrication is required.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an embodiment of the present invention. 1... pump, 3... switching valve, 4... cylinder wall, 5... oil filler port, 6... operating piece, 7... carburetor, 10... starter lever.

Claims (1)

[Scope of utility model registration request] In systems that supply lubricating oil to the engine using a pump linked to the engine, a switching valve is provided between the pump and the engine, one outlet of the switching valve is connected to the intake hole or the crank chamber, and the other outlet is connected to the intake hole or crank chamber. The outlet is connected to a lubrication port provided on the cylinder wall, and the operation piece of the switching valve is connected to the starter lever of the carburetor, so that lubricating oil flows to the cylinder wall at the time of starting by operating the starter lever. Lubrication system for 2-stroke engines.