JP2640838B2 - Semi-dry sump lubrication system for internal combustion engines - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lubricating device for a semi-dry sump type internal combustion engine having a lubricating oil tank separately from an oil pan.

(Prior art and its problems) Conventionally, in a semi-dry sump type internal combustion engine, a lubricating oil tank is provided separately from the oil pan, and the lubricating oil discharged from the oil pump is supplied to both the lubricating part of the engine and the lubricating oil tank (sub tank). Pumping. Therefore, it is necessary to increase the capacity of the oil pump, and the oil pump becomes large.

On the other hand, since the lubricating oil of high temperature after lubrication returns directly to the oil pan, the lubricating oil tends to be insufficiently cooled.

As prior art related to this case, Japanese Patent Application No. 61-47857
No. 47-4853 and Japanese Utility Model 46-26643.

(Object of the Invention) The present invention has been made in view of the above circumstances, and a semi-dry sump type lubricating apparatus for an internal combustion engine capable of miniaturizing an oil pump and preventing overheating of lubricating oil. It is intended to provide a dry sump lubrication device.

(Constitution of the Invention) (1) Technical Means The present invention provides an oil pan at the lower end of a cylinder block of an internal combustion engine, an oil pump inside the oil pan, and a lubricating oil tank outside the oil pan. In a semi-dry sump type lubrication system in which the pressure in the oil tank is set to approximately the same pressure as the crankcase pressure of the internal combustion engine, a feed pipe is provided to send the lubricating oil discharged from the oil pump only to the lubrication required for the engine. A return pipe is provided for returning the lubricating oil discharged from the lubricating oil tank to the lubricating oil tank, and an outlet is formed in the lubricating oil tank so that the lubricating oil once stored in the lubricating oil tank and cooled is returned to the oil pan. A semi-dry sump lubrication system for an internal combustion engine, characterized in that the oil pump is downsized and lubricating oil is prevented from overheating.

(2) Operation Since the lubricating oil from the oil pump is pumped only to the lubricating oil required for the engine, the oil pump is reduced in size.

After cooling the lubricating oil in the lubricating oil tank, the lubricating oil is returned to the oil pan to prevent overheating of the lubricating oil.

(Example) A first example showing a marine diesel engine employing the present invention.
In the figure, 10 is a cylinder block, 11 is a cylinder head, 12
Is an oil pan. A fresh water cooler 13 is provided on the right side surface of the cylinder block 10, and a lubricating oil tank 14 is provided immediately below the fresh water cooler 13. An exhaust turbocharger 15 (FIG. 2) is connected to the cylinder head 11 and an oil pan 12
Has an oil pump 16 built-in.

As shown in FIG. 2, a seawater pump 23, a starter 24, an alternator 25 and the like are provided on the left and right sides of the lubricating oil tank 14. An oil inspection rod guide 26 is connected to the oil pan 12. Reference numeral 27 denotes a gear case, and 28 denotes a flywheel housing. Lubricating oil is supplied only from the refueling port 29 of the lubricating oil tank 14, and the bonnet 30 is not provided with a refueling port. Therefore, the height of the bonnet 30 is reduced.

As shown in FIG. 3, a fuel injection pump 20, a fuel filter 21, an intercooler 22, and the like are provided on the right side surface of the cylinder block 10.

FIG. 4 shows the lubrication system of the engine shown in FIG.
18 to the exhaust turbocharger 15
After lubrication, the oil flows into the lubricating oil tank 14 through the return pipe 32. As will be described later in detail, the lubricating oil tank 14 temporarily stores the lubricating oil 17 and cools the lubricating oil 17 once.
To return to When the exhaust turbocharger 15 is not provided, it is connected by a pipe 19.

FIG. 5 shows the detailed structure of the lubricating oil tank 14. The lubricating oil tank 29 is formed integrally with the lubricating oil tank 14, and the lubricating oil 17 is supplied from the lubricating oil port 29 to the oil level 33. It is designed to refuel. The lubricating oil tank 14 has a cylindrical partition wall 34 formed therein.After the high-temperature lubricating oil 17 flowing from the inlet 35 to which the return pipe 32 is connected is temporarily stored in the lubricating oil tank 14 and naturally cooled, , Cylinder block 10 from outlet 36
The lubricating oil 17 flows into the crank chamber 38 through the passage 37, and returns to the oil pan 12. End face 39 of passage 37
The lubricating oil tank 14 is pressed against the end face 41 of the lubricating oil tank 14, and mounting bolts 42 (FIG. 2) penetrate the lubricating oil tank 14 in a liquid-tight manner through the lubricating oil tank 14. Is fixed to the cylinder block 10. Passage 37,
The protrusion 40 is formed integrally with the cylinder block 10.

An air vent hole 43 is provided in a portion of the partition wall 34 above the oil level 33.
Is opened, and the lubricating oil tank 14 is
The function of releasing the pressure of the leaked gas from the exhaust turbocharger 15 flowing into the inside of the exhaust turbocharger 15 to the crank chamber 38 through the air vent hole 43 is achieved. The case 44 of the Shimizu cooler 13 is an integral type that also serves as the case of the exhaust manifold 45.

Next, the operation will be described. In the above-mentioned semi-dry sump lubrication system, the lubricating oil 17 pressure-fed by the oil pump 16 is supplied to the lubricating portion 18 of the engine via the feed pipe 31 as shown in FIG. Therefore, it is not necessary to send a part of the lubricating oil 17 to the lubricating oil tank 14 through the pipe 50 branched from the feed pipe 31 as in the conventional case, and the capacity of the oil pump 16 is determined according to the amount supplied to the engine requiring lubricating part 18. Only the discharge amount is sufficient, and the oil pump 16 becomes smaller than before.

The lubricating oil 17 after lubricating the engine required lubrication part 18 is sent to the exhaust turbocharger 15, and after lubricating the exhaust turbocharger 15, flows into the lubricating oil tank 14 from the return pipe 32. The high-temperature lubricating oil 17 that has flowed into the lubricating oil tank 14 flows into the lubricating oil tank 14 from the inlet 35 in FIG. 5 and is temporarily stored in the lubricating oil tank 14 so that it does not immediately flow out of the discharge port 36 at the partition wall 34. Then, during this time, it cools naturally and then returns to the crank chamber 38 through the discharge port 36 and the passage 37. Therefore, the pipe 51 in FIG.
The high-temperature lubricating oil 17 after lubricating the exhaust turbocharger 15 through the oil pan 12 does not flow into the oil pan 12, This prevents the lubricating oil 17 from overheating.

As shown in FIG. 5, the lubricating oil tank 14 is installed in a space that has not been conventionally used immediately below the fresh water cooler 13 on the side surface of the cylinder block 10, so that the space utilization efficiency around the engine is high. Moreover, the refueling port of the lubricating oil tank 14
29 extends to the vicinity of the upper end of the case 44 of the fresh water cooler 13. Therefore, in the case of a marine engine in which the engine room cover 52 is provided above the engine as shown in FIG. Refueling work becomes easier.

Further, the bonnet 30 is not provided with a refueling port, and the refueling port 29 is provided only in the lubricating oil tank 14, so that when the lubricating oil 17 is supplied, the lubricating oil 17 supplied from the refueling port 29 is supplied to the lubricating oil tank 14.
And flows into the oil pan 12 through the discharge port 36 and the passage 37. Therefore, oil supply to the oil pan 12 only needs to be performed from one refueling port 29, and only one lubricating oil 17 is supplied.

(Another Embodiment) (1) The present invention is not limited to the above-described one embodiment. For example, as shown in FIG. When discharging the lubricating oil 17 therein, the rubber cap 61 may be removed, and a vacuum-type oil discharging device may be inserted into the oil discharging pipe 60 to suck the lubricating oil 17. As shown in FIG. 8, the oil drain pipe 60 serves as the oil drain pipe of the oil pan 12 (see FIG. 8).
Figure) is arranged in parallel.

Further, as shown in FIG. 9, a connection pipe 63 for communicating the bottom of the lubricating oil tank 14 with the oil pan 12 is provided.
A cock 64 may be interposed in 63 to discharge the lubricating oil 17 in the lubricating oil tank 14 from the oil drain 65 of the oil pan 12.

(2) In a normal engine, a breather chamber is provided in the bonnet 30, and the pressure fluctuation in the crank chamber 38 is released from the breather chamber to the atmosphere. The 17 mist easily leaks from the breather room, and if the breather room is enlarged, the hood 30 becomes large and the overall height of the engine increases.

Therefore, as shown in FIG.
The mist communication passage 66 may be formed at a position higher than the passage 37, and an air vent hole 67 may be opened at the upper end of the bunkering port 29.

In the case of FIG. 10, the large volume of the lubricating oil tank 14 can be used as a breather chamber, and pressure fluctuation can be released from the air vent hole 67 while preventing the mist of the lubricating oil 17 from leaking outside. Also, there is no need to provide a breather chamber in the hood 30, and the hood 30 can be reduced in size.
The overall height of the institution will also be low.

(3) As shown in FIG. 11, the main filter 70 and the lubricating oil cooler 71 are provided in the feed pipe 31, the bypass filter 72 and the lubricating oil tank 14 are provided in the pipe 50, and the lubricating oil is supplied to the oil pan 12.
In the case of a lubrication system that returns 17, the lubricating oil tank 14 and the mounting base 73 for the bypass filter 72 can be formed integrally as shown in FIG.

The mounting base 73 has a lubricating oil inlet 75 and a lubricating oil outlet 76 integrally formed.

(4) As shown in FIG. 13, the lubricating oil tank 14 can be formed integrally with the cylinder block 10. As shown in FIG. 14, the fresh water cooler 13 and the lubricating oil tank 14 are formed on the wall 74 of the case 44. The parts can be integrally connected.

(Effect of the Invention) As described above, in the semi-dry sump circulating device for an internal combustion engine according to the present invention, the lubricating oil 17 pressure-fed from the oil pump 16 is sent to the lubricating oil tank 14 by the feed pipe 31 as shown in FIG. Only, so the piping 50
In comparison with the case where the lubricating oil 17 is also sent to the lubricating oil tank 14,
The capacity of the oil pump 16 can be reduced, and the size of the oil pump 16 can be reduced.

The high-temperature lubricating oil 17 after lubricating the engine lubrication part 18 flows into the lubricating oil tank 14 through the return pipe 32,
After allowing to cool naturally during storage once in step 14, the oil pan 12
As a result, overheating of the lubricating oil 17 can be prevented as compared with the related art in which the high-temperature lubricating oil 17 directly returns to the oil pan 12.

Next, as shown in FIG. 5, a lubricating oil tank 14 is disposed directly below the fresh water cooler 13 on the side surface of the cylinder block 10, and the lubricating oil tank 14 is
, The space directly below the Shimizu cooler 13 that was not conventionally used can be used, and the space utilization efficiency around the engine can be improved.

Moreover, the refueling port 29 of the lubricating oil tank 14 is
The lubricating oil tank 14 extends to the vicinity of the upper end, so that the lubricating oil 17 can be easily supplied even when the lubricating oil tank 14 is disposed immediately below the fresh water cooler 13.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a marine diesel engine employing the present invention, FIG. 2 is a view as seen from an arrow II in FIG. 1, FIG. 3 is a view as seen from an arrow III in FIG. 1, and FIG. 5, FIG. 5 is an enlarged view of FIG. 1, FIG. 6 is a schematic view of a structure when mounted on a hull, FIG. 7 is a schematic view of an oil drain pipe, and FIG.
9, FIG. 9, FIG. 11, FIG. 11, FIG. 12, FIG.
FIG. 14 and FIG. 14 are schematic structural views showing different embodiments. 10 ... Cylinder block, 12 ... Oil pan, 13 ... Shimizu cooler, 14 ... Lubricant tank, 17 ... Lubricant, 29 ...
... refueling port, 34 ... partition wall, 36 ... discharge port

Claims (2)

(57) [Claims] An oil pan is provided at a lower end of a cylinder block of an internal combustion engine, an oil pump is provided inside the oil pan, a lubricating oil tank is provided outside the oil pan, and a pressure in the lubricating oil tank is controlled by a crank of the internal combustion engine. In a semi-dry sump type lubricating device having substantially the same pressure as the case pressure, a feed pipe is provided for feeding lubricating oil discharged from an oil pump to only a lubricating portion requiring an engine, and lubricating oil discharged from a lubricating portion requiring an engine is provided with the lubricating oil. A semi-dry sump type internal combustion engine, wherein a return pipe is provided for returning to the tank, and a discharge port is formed in the lubricating oil tank so that the lubricating oil once stored in the lubricating oil tank and cooled is returned to the oil pan. Lubrication device. 2. An oil pan is provided at a lower end of a cylinder block of the internal combustion engine, an oil pump is provided inside the oil pan, a lubricating oil tank is provided outside the oil pan, and a pressure in the lubricating oil tank is controlled by a crank of the internal combustion engine. In a semi-dry sump type lubricator with approximately the same pressure as the case pressure, the lubricating oil tank is located directly below the fresh water cooler on the side of the cylinder block, the lubricating oil tank is fixed to the cylinder block, and the lubricating oil once stored in the lubricating oil tank A semi-dry sump type lubricating apparatus for an internal combustion engine, wherein a discharge port for returning the lubricating oil into the crankcase is formed, and a refueling port of the lubricating oil tank is formed so as to extend to near the upper end of the fresh water cooler.