JPH02230913A - Semi-dry sump type lubricating device for internal combustion engine - Google Patents

Abstract

PURPOSE:To dispense with piping and simplify a piping structure by directly connecting a lubricant discharge port and a return port on the cylinder block side, to the outlet of a lubricant sub-tank and an inlet side connection port. CONSTITUTION:A lubricant sub-tank 11 is fixed to the side wall of a cylinder block 1. A lubricant discharge port 35 and a return port 20 on the cylinder block side are directly connected to the outlet 21 of the lubricant sub-tank 11 and an inlet side connection port 36. An upward extension passage from the inlet side connection port 36 is formed in the wall of the lubricant sub-tank 11. No piping is required, and a piping structure can be simplified in this way.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a semi-dry sup type lubrication system for an internal combustion engine in which a lubricating oil sub-tank is arranged outside of the oil pan to increase the amount of lubricating oil stored. .

(Prior art and its problems) The lubricating oil sub-tank of this type of lubricating device is provided with an inlet connected to the discharge side of the part requiring lubrication and an outlet opening into the crank chamber. Recently, by fixing the lubricating oil sub-tank directly to the side wall of the cylinder block, the inlet and outlet of the lubricating oil sub-tank are directly connected to the cylinder block's discharge port and return port, thereby eliminating the need for piping and providing lubricant oil. The piping structure is simplified.

However, in the above-mentioned pipeless structure, there are many restrictions on the formation position of the discharge port of the cylinder block, so the height H2 of the inlet 52 of the lubricating oil sub-tank 50 connected to the discharge port, as shown in FIG. The height is lower than the height H1 of the outlet 51 communicating with the crank chamber, which causes the following problems.

During engine operation, the pressure of the oil bomb is applied to the parts requiring lubrication, so pressure is also applied to the inlet 52, and the lubricating oil level in the lubricating oil sub-tank 50 is maintained at the height Hl of the outlet 51. However, several hours after the engine stops W, the lubricating oil in the lubricating oil sub-tank 50 flows from the inlet 52 to the lubricating parts in the cylinder block, for example, the main bearing surface 25 in FIG. The lubricating oil in the oil pan increases as the lubricant flows backward and is discharged from there into the oil pan below. Of course, the lubricating oil sub-tank 5 in Fig. 6
The oil level in 0 falls to the height H2.

However, since oil checking is normally done by measuring the level in the oil pan, as shown above, when the engine is stopped, the oil level in the oil pan becomes high, while the oil level in the lubricating oil sub-tank decreases. If there is, it will be impossible to determine the exact amount of oil in the entire engine.

Furthermore, when the engine starts operating next time, the amount of oil in the oil pan will be larger than necessary, which will cause resistance to the movement of the crank and the like.

(Object of the Invention) The object of the present invention is to simplify the piping structure by omitting the piping of the lubricating oil sub-tank, and to provide a system that allows the inside of the lubricating oil sub-tank and the oil pan to be The goal is to keep the amount of oil constant.

(Technical Means for Achieving the Object) In order to achieve the above object, the present invention provides a lubricating oil outlet on the side wall surface of the cylinder block that communicates with the lubricating parts in the cylinder block, and a lubricating oil outlet for lubricating the lubricating oil. By opening a return port for returning the oil from the sub-tank to the oil pan, forming an inlet connection port and an outlet on the side wall of the lubricating oil sub-tank, and fixing the lubricating oil sub-tank to the side wall of the cylinder block,
The inlet side connection port and the outlet are directly connected to the discharge port and the return port, respectively, and the lubricating oil sub-tank is integrally formed with an upwardly sloped extension passage from the above-mentioned inlet side connection port, and the above-mentioned extended passage facing into the lubricating oil sub-tank. The position of the tip entrance is set at the same level or higher than the exit.

(Function) When the engine is operating, the lubricating oil in the oil pan is pumped to each lubricating part by the oil pump, and passes from the discharge port of the cylinder block to the inlet connection port of the lubricating oil sub-tank, the extension passage, and the inlet to the lubricating oil sub-tank. is discharged. Then, the oil overflows from the outlet into the oil pan, and the oil in the lubricant subtank is maintained at the level of the outlet.

When the engine is stopped, the inlet of the lubricating oil sub-tank is installed higher than or at the same height as the outlet, which prevents lubricating oil from flowing back from the inlet, and the oil level in the lubricating oil sub-tank remains the same as during operation. The level of the outlet is maintained, and the oil in the oil pan is also maintained at the same level as during operation.

(Example) FIG. 1 is a longitudinal sectional view of an internal combustion engine equipped with a semi-dry sup type lubrication device according to the present invention.
An oil pan 2 is fixed to the lower end of the cylinder block 1, into which a certain amount of lubricating oil L is injected, and a small oil bob 3 is arranged. 5 is a crankshaft, and 8 is a camshaft.

A side wall of the cylinder block 1 is formed with a lubricating oil return port 20 that communicates the inside of the crank chamber 17 with the outside, a sub-tank mounting seat 18, and the like. The lubricating well sub-tank 11 is formed of aluminum casting and is arranged on the side of the cylinder block 1, and is attached to the mounting seat 18 with a plurality of bolts (not shown).
is directly fixed by. The lubricating oil sub-tank 11 is integrally formed with an extension part 11a that extends upward from the side h of the fresh water cooler 8 and the exhaust manifold 7.
A cap 15 is detachably attached to the filler port 14 at the upper end of the tank. 9 is a case that covers the fresh water cooler 8 and the like.

A lubricating oil outlet 21 is formed on the side wall of the lubricating oil sub-tank 11 on the cylinder block side at a position corresponding to the return port 20. By fixing the lubricating oil sub-tank 11 to the cylinder block 1, the outlet 21 is connected to the return port 20. Connected directly. 23 is a cylindrical partition wall, and the outlet 21 communicates with the lubricating oil sub-tank 11 via the lower end of the partition wall 23. Air holes 24 are formed at the upper end 1 of the partition wall 23.

As shown in FIG. 4, a lubricating oil discharge port 3 is provided in a side wall portion of the cylinder block 1 at a position axially away from the return port 20.
5 is formed, and an inlet side connection port 36 is formed in the side wall portion of the lubricating oil sub tank 11 corresponding to the discharge port 35. It is directly connected by being fixed to the side wall of the cylinder block 1.

An axially long main gallery 26 for lubricating oil is formed in the cylinder block wall on the opposite side from the discharge port 35, and the main gallery 26 communicates with each lubricating part of the engine. One of the parts requiring lubrication is the main bearing surface 25 and the cam bearing surface 30. The main bearing surface 25 communicates with the main gallery 26 via the oil passage 27, and the cam bearing surface 30 communicates with the oil passage 29.
It communicates with the main bearing surface 25 via. Above oil path 2
A discharge oil passage 31 branches from 9, and the discharge oil passage 31 communicates with the discharge port 35.

FIG. 2 shows an enlarged view of the n-tt cross section of FIG. 1, and in this FIG. It is formed on the end wall of the lubricating oil sub-tank 11.

Although the inlet side connection port 36 is located at a lower position than the outlet 21,
An inlet 41 located higher than the outlet 21 due to the extension passage 40
The lubricating oil is poured into the lubricating oil sub-tank 11 from the lubricating oil sub-tank 11. That is, a passage forming boss part 43 is integrally formed on the inner surface of the lubricating oil sub-tank 11, and an extension passage 40 is formed within the boss part 43, and one end of the extension passage 40 is connected to the inlet side connection port 36. It communicates with the inlet side connection port 3.
6, the high-position side end reaches a position higher than the outlet 21, and an inlet 41 is formed at the high-position side end, facing into the lubricating oil sub-tank 11. 39 is a plug.

The inlet side connection port 36 and the extension passage 40 are formed by drilling, and a plug 45 is screwed onto the end of the extension passage 40, as shown in FIG.

Next, the operation will be explained. In FIG. 5, which shows the oil circulation path, lubricating oil in the oil pan 2 is sucked up by the oil bomb 3 during engine operation, is sent under pressure to the main gallery 26 via the main filter 4, and is transferred from the main gallery 26 to the main bearing surface 25 and the main bearing surface 25. It is fed under pressure to other parts N that require lubrication and is used for lubrication or cooling.

In FIG. 4, a part of the lubricating oil sent from the main bearing surface 25 to the cam bearing surface 30 via the oil passage 29 passes through the discharge oil passage 31 to the discharge port 35, and from there directly to the lubricating oil sub-tank 11. Enter the inlet side connection port 36 and extend the passageway 4 shown in FIG.
0 and is discharged into the lubricating oil sub-tank 11 from the inlet 41. In the lubricating oil sub-tank 11, the lubricating oil is temporarily held in a partition wall 23 so as not to be immediately released from the outlet 21, and during this time it is naturally cooled, and is allowed to overflow from the outlet 21 and returned to the oil pan 2.

During such engine operation, lubricating oil sub tank 1
The lubricating oil in the oil pan 1 is maintained at the local level Hl of the outlet 21, and the inside of the oil pan 2 is maintained at a height as shown in FIG.

When the engine is stopped, the oil pump 3 stops and the circulation of the lubricating oil stops. However, as shown in FIG. The oil level in the sub-tank 11 is maintained at the level of the outlet 21 and does not decrease. Therefore, the amount of oil in the oil pan 2 is maintained at approximately the same position as during operation, and the oil does not rise.

When replenishing lubricating oil, simply replenish it from the upper oil filler port 14 of the lubricating oil sub-tank 11.
A predetermined amount can be supplied to the inside and the oil pan 2.

(Another Embodiment) In the illustrated embodiment, the inlet 41 of the lubricating oil sub-tank 11 is located higher than the mouth 21, but it may be located at the same height.

(Effects of the Invention) As explained above, according to the present invention: (1) The lubricating oil sub-tank 1 is attached to the side wall of the cylinder block 1.
1, the lubricating oil discharge port 35 and return port 20 on the cylinder block 1 side, and the lubricating oil sub tank 11
Since the outlet 21 and the inlet side connection port 36 are directly connected, pipe piping is not required and the piping structure can be simplified.

(2) In the pipeless structure, an upwardly sloped extension passage 40 is formed in the wall of the lubricating oil sub-tank 11 from the inlet side connection port 36, and the position of the tip inlet 41 of the extended passage 41 facing into the lubricating oil sub-tank is The oil level in the lubricating oil sub-tank 11 and oil pan 2 can be maintained at the same constant level as when the engine is running, even when the engine is stopped or when refueling. Able to apply oil accurately.

(3) Furthermore, by preventing oil buildup in the oil pan, resistance due to the oil in the oil pan when starting the engine can be eliminated, and smooth operation of the crank and the like can be maintained.

(4) Since the lubricating oil sub-tank 11 is directly fixed to the side wall of the cylinder block 1, the height of the engine can be kept low and the engine can be made more compact.

(5) Since the discharge port 35 is provided so as to communicate with the parts requiring lubrication, the capacity of the oil pump 3 is sufficient to supply the oil to the parts requiring lubrication, and the size of the oil pump 3 can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an internal combustion engine equipped with a semi-dry sup lubrication system to which the present invention is applied (II sectional view in FIG. 2);
Figure 2 is an enlarged cross-sectional view of Figure 1 along ■-■, Figure 3 is an enlarged cross-sectional view of Figure 2 along ■-■, Figure 4 is an enlarged cross-sectional view of IV-TV in Figure 2, and Figure 5 is an enlarged cross-sectional view of lubricating oil. FIG. 6 is a sectional view of the conventional lubricating oil sub-tank taken in the same manner as FIG. 2. 1...
・Cylinder block, 2... Oil pan, 3... Oil bomb, 11... Lubricating oil sub tank, 20...
Return port, 21...Exit, 35...Discharge port, 36...
・Inlet side connection port, 40... Extension passage, 41... Inlet, 25, 30... Main bearing, cam bearing surface (example of parts requiring lubrication) Patent applicant Yanmar Diesel Co., Ltd. Figure 1 j Figure 4 Figure 5

Claims (1)

[Claims] In a semi-dry sup type lubrication system for an internal combustion engine, in which an oil pan 2 is provided at the lower end of the cylinder block of the internal combustion engine, and a lubricating oil sub-tank 11 is placed on the side of the cylinder block, the side wall of the cylinder block 1 is equipped with a lubricating oil pan 2 at the lower end of the cylinder block. A lubricating oil discharge port 35 communicating with the lubricating oil sub-tank 11 and a return port 20 for returning the lubricating oil from the lubricating oil sub-tank 11 to the oil pan 2 are opened, and an inlet-side connection port 36 and an outlet 21 are provided on the side wall of the lubricating oil sub-tank 11. By forming and fixing the lubricating oil sub-tank 11 to the side wall of the cylinder block, the inlet side connection port 36 and the outlet 21 are connected to the discharge port 35 and the return port 2.
0, respectively, and the lubricating oil sub tank 11 has
An upwardly sloped extension passage 40 is integrally formed from the inlet side connection port 36, and the extension passage 4 faces into the lubricating oil sub-tank.
A semi-dry sup type lubricating device for an internal combustion engine, characterized in that the position of the tip inlet 41 of the 0 is set to be the same as or higher than the outlet 21.