JPH0319439B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a separate lubrication device for an outboard motor.

One type of lubrication system for outboard motors is a separate lubrication system that stores fuel and lubricating oil in separate tanks and supplies the lubricating oil to the engine using a pressure pump.

[Conventional technology]

In the above-mentioned separate lubrication system, when the lubricating oil tank is installed inside the hull, one end is attached to the bottom side of the lubricating oil tank in order to prevent the pressure pump from being contaminated or corroded by water scale on the hull floor. A pressure pump may be connected to the other end of the suction pipe to which the lubricating oil tank is connected, and the pressure pump may be placed above the suction pipe connection part of the lubricating oil tank.

[Problem to be solved by the invention]

However, in a separate lubrication system in which pressure pumps are arranged as described above, if the remaining lubricating oil level in the lubricating oil tank is located below the pump chamber level of the pressure pump when the pressure pump is not in operation, , causing air to enter the pump chamber. Therefore, in such a case, when the pressure pump is restarted, the pressure pump idles, making it difficult to smoothly pump the remaining amount in the lubricating oil tank.

The present invention prevents fouling and corrosion of pressure pumps,
Another purpose is to prevent malfunction due to idle rotation when the pressure pump is restarted after being stopped.

[Means for Solving the Problems] The present invention stores lubricating oil in a lubricating oil tank, and connects a pressure pump to the other end of a suction pipe whose one end is connected to the bottom side of the lubricating oil tank. In a separate lubricating system for an outboard motor, a pressure pump is disposed above the suction pipe connection part of the outboard motor, and the lubricating oil is pumped to the engine side through the pressure pipe connected to the pressure pump. The connection part and the connection part between the pressure pump and the suction pipe are located above the connection level of the suction pipe to the lubricating oil tank, and the intermediate part of the pressure feeding pipe is located above the connection level of the suction pipe to the lubricating oil tank. It is positioned at a lower level.

[Function] The present invention is characterized by ``locating the connection between the pressure pump and the pressure pipe and the connection between the pressure pump and the suction pipe above the level at which the suction pipe connects to the lubricating oil tank,'' and By locating the intermediate section at a level lower than the level at which the suction pipe connects to the lubricating oil tank, the pipe line consisting of the suction pipe and the pressure-feeding pipe is folded at at least two points, upper and lower, so that no air is absorbed during use. A return path is provided to prevent oil from entering, and a pressure pump is placed above the bottom of the lubricating oil tank in this return path, as shown below.
It has the function and effect of

Since the pressure pump is located above the bottom of the lubricating oil tank, it is possible to prevent the pressure pump from being contaminated or corroded by water scale on the bottom of the hull.

Even if the remaining lubricating oil level in the lubricating oil tank is below the level of the pump chamber of the pressure pump when the pressure pump is stopped, the pump chamber of the pressure pump is located between the lubricating oil tank, the suction pipe, or the pressure pipe. It is stably immersed in lubricating oil that is continuously present. Therefore, the possibility of idle running of the pressure pump due to air intrusion into the pump chamber is eliminated, and the entire lubricating oil contained in the lubricating oil tank can be pumped up.

[Example] Figure 1 is an overall view showing an example of the present invention, and Figure 2 is a general view showing an example of the present invention.
The figure is a partially cutaway side view of the main tank, and FIG. 3 is a partially cutaway side view of the sub tank.

The outboard motor 10 can be attached to the stern plate 11A of the hull 11, and a V-type four-cylinder engine 13, for example, is mounted on the upper part of the propulsion unit 12. In the crank chamber of each cylinder in this engine 13,
A carburetor 15 and an intake box 16 are connected via an intake manifold 14. The carburetor 15 also includes a fuel tank 17 installed inside the hull 11.
The fuel inside can be supplied by a fuel pump (not shown).

On the other hand, lubricating oil that can lubricate the engine 13 is stored in a relatively large-capacity main tank 18 that is installed within the hull 11 and constitutes a lubricating oil tank in the present invention. In the main tank 18,
A pump 19 serving as a pressure pump in the present invention is fixed. The pump 19 in this embodiment is a gear pump, and the pump chamber 1
A pumping action is performed by driving a gear 19B disposed in 9A with a DC motor, and the lubricating oil sucked from the main tank 18 via the suction pipe 20 is pumped into the pumping pipe 2 as a pressure-feeding pipe in the present invention.
1, it can be pumped up to a sub-tank 22 fixed to the upper side of the engine 13.
The lubricating oil in the sub-tank 22 passes through the suction pipe 23 and enters the sub-tank 22 on the side of the engine 13.
It is possible to flow into a lubricating pump 24 fixed to a lower portion of the lubricating pump 24 .

The lubrication pump 24 is a plunger pump,
Driven by the rotation of the crankshaft of the engine 13, the lubricating oil introduced from the sub-tank 22 via the suction pipe 23 is force-fed from each discharge pipe 25 to the intake manifold 14 of each cylinder, so that it can be discharged into the air-fuel mixture. Note that the lubricating oil discharged into the air-fuel mixture in the intake manifold 14 lubricates various parts of the engine and then burns and is consumed.

The main tank 18 is constructed as shown in FIG. That is, a supply port 27 to which a cap 26 is screwed is formed in the ceiling of the main tank 18, and a connection port 28 to which a suction pipe 20 is connected is formed in a side surface on the bottom side thereof. In addition,
The cap 26 has a valve that opens when lubricating oil is pumped up.
A check valve 29 is provided that makes it possible to maintain the space within the main tank 18 at atmospheric pressure.

Here, the pump 19 provided in the main tank 18 is fixed to a vertically intermediate portion of the side surface of the main tank 18 . As a result, the connection between the pump 19 and the pump pipe 21,
The connection portion between the pump 19 and the suction pipe 20 is arranged above the level of the suction pipe connection port 28 in the main tank 18. Further, the intermediate portion 21A of the pumping pipe 21 connected to the pumping pump 19 is piped so as to pass through a level below the height level of the suction pipe connection port 28 in the main tank 18.

Next, the sub-tank 22 is constructed as shown in FIG. That is, a connection port 30 to which the pumping pipe 21 is connected is formed in the side surface on the ceiling side of the sub-tank 22, and a connection port 31 to which the suction pipe 23 is connected is formed in the bottom of the sub-tank 22. . Note that a portion of the ceiling of the sub-tank 22 is filled with lubricating oil so that the outboard motor 10 is filled with lubricating oil even when the outboard motor 10 is tilted up at any steering angle position. Check valve installation chamber 32 that maintains a space that cannot be invaded
is formed protrudingly, and the check valve installation chamber 32 forming portion of the sub-tank 22 includes a check valve 33 that opens when lubricating oil is pumped up, and a reverse valve that opens when lubricating oil is supplied to the lubricating pump 24. A stop valve 34 is provided to maintain the space inside the sub-tank 22 at atmospheric pressure at all times, and to facilitate smooth driving of the pump pump 19 and the lubricating pump 24.

The sub-tank 22 has oil level levels such as a full oil level 35A and a replenishing oil level 35B set therein, and also has an oil level detector 36 built therein. The oil level detector 36 includes a stopper 38 fitted into an opening 37 provided in the ceiling of the sub-tank 22, a cylindrical part 39 hanging down from the bottom surface of the stopper 38 to near the bottom of the sub-tank 22, and a lubricating oil level detector 36. A housing 41 is provided with a plurality of flow holes 40 that allow the flow of water, and is fixed to the stopper 38 and the cylindrical portion 39 so as to cover the entire length of the cylindrical portion 39, and a ring between the cylindrical portion 39 and the housing 41. A float 42 that moves up and down in the shaped space according to changes in the oil level, and a reed switch 4 installed at each level corresponding to the two oil level levels in the cylindrical part 39.
3A, 43B are fixed to the float 42 and are located at the same level as the actual oil level, and each reed switch 4
It is composed of a magnetic ring 44 that turns on 3A and 43B. The float 42 is in contact with the lower surface of the stopper 38 at its upper limit position, making it possible to maintain the ON state of the reed switch 43A.

Here, a control box 45 is fixed between the sub-tank 22 and the lubricant pump 24 on the side of the engine 13. The control box 45 includes an oil level detector 36
The pumping operation can be controlled as follows according to the change in the oil level in the sub-tank 22 detected by the sub-tank 22. That is, when the oil level in the sub-tank 22 falls from the full oil level 35A due to consumption of lubricating oil and reaches the replenishment oil level 35B, the float 42 also falls, and the magnetic ring 44 closes the reed switch 43.
Turn on B. The ON signal of the reed switch 43B starts driving the motor of the pump 19 via the electric circuit in the control box 45, and the main tank 18
The lubricating oil inside is pumped up into the sub tank 22. The flow rate of the lubricating oil pumped up by the pump 19 is set to be larger than the maximum amount of lubricating oil consumed by the engine 13, so that the oil level in the sub-tank 22 rises and reaches the full oil level. It reaches 35A. At this time, the float 42 also rises in response to the rise in the oil level, the reed switch 43A is turned on by the magnetic ring 44, the motor of the pump 19 is stopped, and pumping of lubricating oil is stopped. Normally, by repeating the pumping operation described above, the lubricating oil in the sub-tank 22 can be maintained between the full oil level 35A and the supply oil level 35B.

As the above normal pumping operation is repeated,
The oil level in the main tank 18 gradually decreases to a point where it drops below the fixed level of the lift pump 19.

Therefore, in the above embodiment, since the pump 19 is disposed above the bottom of the main tank 18, it is possible to prevent the pump 19 from being contaminated or corroded by water scale or the like on the bottom surface of the hull. Further, as described above, the intermediate portion 21A of the pumping pipe 21 is located at a level lower than the connection level of the suction pipe 20 to the main tank 18. Therefore, as mentioned above, even when the oil level in the main tank 18 drops to a level 46A lower than the fixed level of the pump pump 19 as shown by the dashed line in FIG. The interior continues to be filled with lubricating oil up to the same level 46B as level 46A, as shown by the dashed line in FIG. That is, even when the oil level in the main tank 18 drops to near the connection port 28 of the suction pipe 20, the pump chamber 19A of the pump pump 19 is located between the main tank 18, the suction pipe 20, or the pump pipe 21. The pump 19 is stably immersed in the lubricating oil continuously present in the main tank 18, eliminating the possibility of idling due to air entering the pump chamber 19A. Enables pumping of lubricating oil.

In the above embodiment, the main tank 18 on the hull side is used as a lubricating oil tank in the present invention, and the pump pump 19 is explained as a pressure pump in the present invention. However, in the present invention, even if the tank fixed to the outboard motor body is the lubricating oil tank of the present invention, and the lubricating pump that can pump lubricating oil from the tank is the pressure pump of the present invention. good.

Further, in the above embodiment, the pump 19 made of a gear pump was explained as a pressure pump according to the present invention, but the pressure pump according to the present invention may be composed of another type of pump.

Furthermore, the present invention does not necessarily require the provision of both tanks, a main tank on the hull side and a sub-tank on the outboard motor main body side.

[Effects of the Invention] As described above, according to the present invention, it is possible to prevent the pressure pump from being fouled and corroded, and to prevent malfunction due to idling when the pressure pump is restarted after being stopped.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing one embodiment of the present invention, and FIG.
The figure is a partially cutaway side view of the main tank, and FIG. 3 is a partially cutaway side view of the sub tank. 10... Outboard motor, 13... Engine, 18...
Main tank, 19... pumping pump, 20... suction pipe, 21... pumping pipe, 21A... middle part, 2
8...Connection port.

Claims (1)

[Claims] 1 Store lubricating oil in a lubricating oil tank, connect a pressure pump to the other end of the suction pipe whose one end is connected to the bottom side of the lubricating oil tank, and connect the pressure pump to the part above the suction pipe connection part of the lubricating oil tank. In a separate lubrication system for an outboard motor that pumps lubricating oil to the engine side through a pressure pipe connected to a pressure pump, the connection part between the pressure pump and the pressure pipe, and the connection between the pressure pump and the suction pipe. The intermediate portion of the pressure feed pipe is located at a level below the level at which the suction pipe connects to the lubricating oil tank. Separate lubrication system for outboard motors.