JPS6213494B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating oil supply device for a two-cycle engine, a rotary engine, an engine with a rotary valve, etc., which supplies lubricating oil mixed with fuel in order to lubricate each part of a cylinder.

There are two types of lubricating oil supply systems for the two-stroke engines and the like: a fuel mixing type and a separate oil supply type.

In the fuel mixing type, lubricating oil is mixed into the fuel at a fixed mixing ratio in advance, but it is cumbersome to measure and stir the lubricating oil. Furthermore, since the amount of lubricating oil used for fuel is small, there is also the hassle of selling small amounts of lubricating oil.

Separate oil supply type is a type that has a pump between the lubricant tank and the engine and supplies a measured amount of lubricant to the float chamber of the carburetor by the pump action.
There are two types of pumps: one that pumps air into the suction pipe, and one that pumps pressure into the friction area between the crank bearing and the cylinder.The pump action is an intermittent discharge driven by the engine, and the increase or decrease in discharge amount is determined by commands from the control device. This is due to

Therefore, although the measurement accuracy and mixing accuracy are improved, due to the lag in response, it is not possible to sufficiently supply the required amount of lubricating oil to the required locations.

Therefore, it is more effective to mix the fuel and lubricating oil in advance and further mix the lubricating oil in fine particles.

Patent application No. 53-51514 proposed in view of the above points
The invention of a fuel tank for a two-stroke engine is known in Japanese Patent Laid-Open No. 54-142434.

In the above invention, when a fuel tank is refilled with fuel from a fuel supply pipe, the bellows type pump in the tank contracts due to the rise in the liquid level, and the lubricating oil in the pump chamber is pushed out from the discharge port through the pipe into the fuel supply pipe. It mixes with the fuel flowing inside the pipe.

When fuel is consumed by engine operation,
The bellows type pump is configured to extend as the liquid level falls and suck lubricating oil from the lubricating oil tank into the pump chamber.

In other words, by refilling the fuel tank, an amount of lubricating oil commensurate with the amount of fuel in the tank is automatically mixed in, and lubricating oil is automatically refilled into the pump chamber in accordance with the use of fuel. Be prepared for lubricant to be mixed in when refueling next time. Furthermore, the lubricating oil is atomized by discharging it into the flow of replenishing fuel, but if the lubricating oil discharge port opens into the oil supply pipe, the force of the flow of replenishing fuel will be reduced. There is a problem that the lubricating oil is blocked from being discharged.

In addition, when the discharge pipe of the bellows type pump inside the fuel tank is connected to the refueling oil supply pipe as described above, the lubricating oil discharge pipe is exposed outside the fuel tank and becomes bulky. There are restrictions on the piping layout between the pipes, which also affects the setting of the installation location of the fuel tank.

Since a serpentine pump is compressed by being pushed up from below, the weight of the lubricating oil within the serpentine pump may act as resistance, making the pump not operate smoothly.

The present invention automatically stirs and mixes an amount of lubricating oil at a constant mixing ratio with respect to the fuel in the tank when replenishing the fuel, and also pumps a constant amount of lubricating oil into the pump chamber as the fuel is used. It is an object of the present invention to solve the problems related to the above-mentioned lubricant discharge and installation of a fuel tank in a lubricant supply device for a two-stroke engine or the like having a suction configuration.

In order to achieve the above object, the lubricating oil supply device of the present invention includes a reciprocating pump in a fuel tank, which has a pump chamber with a volume that can hold an amount of lubricating oil at a constant mixing ratio with respect to the fuel in the tank. and connect the suction pipe of the pump to the lower part of the lubricating oil tank,
The outlet of the discharge pipe is located above the highest liquid level in the fuel tank, a lubricating oil diffusion plate is placed near the outlet of the discharge pipe, and a float is attached to the side of the force point of the reciprocating pump drive lever. It is characterized in that the pump chamber is configured to shrink as the liquid level rises during replenishment, and expands as the liquid level falls as fuel is used.

The configuration of the embodiment shown in the drawings will be specifically described below. 1 is a fuel tank, 2 is a tank cap, and 3 is a fuel supply pipe that leads to the engine. 4 is a lubricating oil tank, 5 is its tank cap, and 6 is an oil level gauge.

A diaphragm pump 7 is installed in the fuel tank 1, its suction pipe 8 is connected to the lower part of the lubricating oil tank 4, and the outlet of the low output pipe 9 is connected to the tank 1.
It is located above the highest level of fuel within the tank. A diffuser plate 10 is located directly below the outlet of the discharge pipe. The pump chamber 71 of the diaphragm pump 7 is connected to the tank 1
It has a capacity that can store lubricating oil in an amount that provides a certain mixing ratio for a full tank of fuel. A float 12 is attached to the force point end of the diaphragm drive lever 11, and when the fuel level rises, the diaphragm 72 is pushed down to reduce the pump chamber 71, and when the liquid level falls, the diaphragm 72 is pulled up and the pump chamber 71 is reduced. 71 is enlarged.

The float 12 is placed approximately at the center of the tank where the liquid level fluctuation is minimal. Further, it is preferable to erect a wave shield cylinder 14 having a number of small holes 13 in its circumferential surface, as shown in FIG. 2, around the part where the float 12 moves up and down.

The oil diffusion plate 10 is connected to the discharge pipe 9 as shown in FIG.
They can also be provided around the outlet with the outlet facing upward.

Next, the effect will be explained. When oil is poured into the lubricating oil tank 4, the oil passes through the suction valve 81 and enters the pump 7.
filled with. When fuel is injected into the fuel tank 1 in this state, the float 12 rises and the pump 7
operates, the pump chamber 71 contracts, and the lubricating oil therein opens the discharge valve 91 at the outlet of the discharge pipe 9 and is discharged into the fuel.

When the engine is operated and the fuel level in the tank 1 falls, the float 12 descends accordingly, pulling up the diaphragm 72 via the lever 11, expanding the pump chamber 71, and reducing the pressure inside the chamber. It's coming.

Then, the discharge valve 91 is closed, the suction valve 81 is opened, and the lubricating oil in the tank 4 is sucked into the pump chamber 71 through the suction pipe 8, resulting in the state shown in FIG. When the fuel is almost exhausted, the pump chamber 71 is filled with lubricating oil.

When the fuel is refilled, the diaphragm 72 is pushed down by the rise of the float 12 due to the rise in the liquid level, and the pressure inside the pump chamber 71 is increased. Therefore, the suction valve 81 is closed, the discharge valve 91 is opened, and the pump chamber 7
Release the lubricating oil in 1.

The lubricating oil discharged from the discharge pipe 9 hits the diffusion plate 10 and is broken into small particles, which are well mixed into the fuel.

In the above embodiment, a diaphragm pump was used as the reciprocating pump for releasing lubricating oil, but a piston pump, a plunger pump, etc. may also be used.

As the suction valve 81 and the discharge valve 91, check valves made of rubber called Duckbill were used, but the structure of the check valves is not limited. The discharge pipe 9 is connected to the highest position of the pump chamber 71 to automatically bleed air.

If a ball member having a specific gravity larger than that of the fuel and having corrosion resistance is placed in the fuel tank 1, it will roll within the tank while the vehicle is running to promote mixing of the fuel and lubricating oil.

Since the device of the present invention has the above configuration, when refueling, an amount of lubricating oil commensurate with the amount of fuel is automatically supplied and mixed into the fuel, making it possible to always obtain lubricating oil-containing fuel with an appropriate mixing ratio. In addition to saving you the trouble of measuring and mixing lubricating oil with the fuel each time you refuel, the outlet of the pump's discharge pipe is located above the highest level of fuel in the tank, so the discharge pipe is not exposed to the outside of the tank. Since there is no exposure, the structure of the entire lubricating oil supply device becomes compact, and there is an advantage that the degree of freedom in setting the installation location of the lubricating oil supplying device including the fuel tank and the lubricating oil tank increases.

Furthermore, positioning the outlet of the discharge pipe above the highest liquid level of the fuel in the tank also has the effect of preventing oil leakage due to improper closing of the discharge valve at the outlet.

Since a diffusion plate is placed near the outlet of the discharge pipe, no matter where the outlet of the discharge pipe is located above the highest liquid level in the tank, the lubricating oil is diffused and atomized, and the discharge pipe The exit can be freely set in a position where it will not be affected by others.

Since the reciprocating pump for lubricating oil supply is driven via a lever as the fuel level rises, the pump chamber is compressed from above. In other words, the pump operates smoothly as it is completely unaffected by the weight of the lubricating oil in the pump chamber, and by setting the outlet of the discharge pipe at a position where no refueling fuel is applied, it is possible to reduce the amount of refueling that occurs in one refueling session. It is possible to reliably supply and mix the entire amount of lubricating oil in the pump chamber into the fuel.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the device of the present invention, FIG. 2 is a longitudinal sectional front view of a wave shielding cylinder for a float, and FIG. 3 is a longitudinal sectional front view of a modified example of a discharge pipe outlet. 1 is a fuel tank, 4 is a lubricating oil tank, 7 is a reciprocating pump for lubricating oil supply, 71 is a pump chamber, 72 is a diaphragm, 8 is a suction pipe, 81 is a suction valve, 9 is a discharge pipe, 91 is a discharge valve, 10 is a diffuser plate, 11 is a lever, 12 is a float, and 13 is a wave shielding plate.

Claims (1)

[Claims] 1. A reciprocating pump having a pump chamber with a volume that can hold an amount of lubricating oil at a constant mixing ratio to the fuel in the tank is installed in the fuel tank, and the suction pipe of the pump is connected to the lower part of the lubricating oil tank. At the same time, the outlet of the discharge pipe is located above the highest liquid level in the fuel tank, a lubricating oil diffusion plate is placed near the outlet of the discharge pipe, and a float is attached to the end of the reciprocating pump drive lever on the force side. A lubricating oil supply for a two-stroke engine, etc., characterized in that the pump chamber is configured to shrink as the liquid level rises during refueling, and expand as the liquid level falls due to the use of fuel. Device.