JPH086877B2 - Semi-dry sump lubrication system for internal combustion engines - Google Patents

Description

The present invention relates to a semi-dry sump type lubricating device for an internal combustion engine.

(Prior Art and Problems Thereof) Generally, a semi-dry sump type lubricating device is provided with a lubricating oil tank 54 separately from the oil pan 2 as shown in FIG. 3 in order to secure a large amount of lubricating oil, and a lubricating oil passage 56 Lubricating oil is put into the lubricating oil tank 54 through the branching bypass oil passage 58, and is returned to the inside of the oil pan 2 through the return pipe 51.

However, the conventional lubricating oil tank 54 is opened to the atmosphere by the air vent 50 or the like, and the head difference (gravitational head) H between the lubricating oil in the tank 54 and the lubricating oil in the oil pan 2 causes the tank 54
The lubricating oil is returned to the oil pan 2. Therefore, it is necessary to secure the head difference H of at least 1.5 m or more, and the lubricating oil tank 54 must be installed at a high position, and the overall height of the engine including the tank 54 becomes high. Also tank
The pipe between 54 and oil pan 2 also becomes longer.

By the way, when the lubricating oil tank is arranged in a small vessel as shown in FIG. 2, it is necessary to arrange the lubricating oil tank itself above the deck 39, and it is difficult to secure a space.

(Technical Means for Solving the Problems) In order to solve the above problems, the present invention includes an oil pan at the lower end of a cylinder block, a lubricating oil tank for a semi-dry sump separate from the oil pan, and an oil pan inside the oil pan. An engine-driven oil pump is arranged, and the discharge part of the oil pump communicates with each lubrication point in the engine through an oil passage, and branches in the middle to communicate with the lubricating oil tank, and the lubricating oil tank to the oil pan. In a semi-dry sump type lubricating device for an internal combustion engine that returns oil to the inside, the lubricating oil tank has a closed structure that is shielded from the outside air, and the upper end of the lubricating oil tank is communicated with the upper end of the oil pan by a ventilation communication pipe for lubrication. The internal pressure of the oil tank is set to be the same as the internal pressure of the oil pan.

(Function) The lubricating oil sucked from the oil pan by the oil pump is supplied to each lubrication point in the engine through the oil passage and the oil filter, and at the same time branched to the lubricating oil tank through the bypass pipe. Supplied.

Since the pressure inside the oil pan is kept substantially the same as the pressure inside the oil pan by the ventilation connecting pipe, the lubricating oil is returned to the oil pan through the return pipe as the amount of lubricating oil in the oil pan decreases.

(Embodiment) FIG. 1 is a vertical cross-sectional view of a semi-dry sump type lubricating device to which the present invention is applied. In FIG. 1, an oil pan 2 is fixed to a lower end portion of a cylinder block 1 of a diesel engine, A semi-dry sump lubricating oil tank 14 is arranged laterally of the oil pan 2 at substantially the same height.

An oil pump 6 is arranged at the bottom of the oil pan 2,
The suction port 7 of the oil pump 6 is opened at the bottom of the oil pan 2, the discharge part 6a is connected to the joint 10 on the side wall of the cylinder block through the oil passage 8, and the lubricating oil pipe 11 and an oil filter (not shown) are used. It communicates with each lubrication point in the engine.

The lubricating oil tank 14 has a closed structure that is shielded from the outside air. For example, two upward partition plates 15 and two downward partition plates 16 are alternately provided in the lubricating oil tank 14, As a result, the inside of the tank 14 is partitioned into five rooms A1 to A5 from the side opposite to the oil pan 2. The room A1 and the next room A2 are in communication with each other at the bottom, the room A2 and the next room A3 are in communication with each other at the top, and the room A3 and the next room A4 are at communication with each other at the bottom. Comrades are in communication. Further, a ventilation hole 42 for maintaining the same pressure in all the rooms A1 to A5 is formed at the upper end of the downward partition plate 16.

On the upper wall of the lubricating oil tank 14, a pressure cap type oil filling port (replenishing port) 19, a lubricating oil inlet 29 and a ventilation connection port 24 are formed. The oil injection port 19 is formed in the upper direction of the room A3 and the filler cap 18 is attached. The lubricating oil inlet portion 29 is formed in the upward direction of the room A1, and is provided with an inlet pipe 30 projecting downward into the room A1. The lubricating oil inlet portion 29 is connected to the joint 10 portion of the oil passage 8 via a bypass pipe 28 and a check valve 26. The ventilation connection port 24 is formed in the uppermost direction of the room A5 closest to the oil pan 2 and is connected to the ventilation communication pipe 23. The other end of the ventilation communication pipe 23 is the upper end portion of the oil pan 3 and is connected to at least the ventilation connection port 34 above the oil level L in the oil pan 2.

A lubricating oil return port 20 is formed at the lower end of the side wall of the room A5, and a flexible return pipe 21 is connected to the return port 20, and the other end of the return pipe 21 is at the bottom of the oil pan 2. It is connected to the return port 22.

Further, drain caps 44 are attached to the lower walls of the rooms A1, A3, and A5, respectively.

FIG. 2 shows an example in which the internal combustion engine having the lubrication system of FIG. 1 is arranged in a small vessel. The internal combustion engine E is arranged in the engine room below the deck 39, and the lubricating oil tank 14 is arranged in the engine E. And the speed reducer / reverse gear 37, and is arranged at a position not interfering with the shaft coupling 36 and substantially at the same height as the oil pan 2.
38 is a propeller shaft and 40 is a ship bottom.

Before starting the engine, the oil pan 2 has, for example, L shown in FIG.
A large amount of lubricating oil is stored, and the lubricating oil tank 14 also stores the lubricating oil as shown in FIG.

During operation of the engine, the lubricating oil in the oil pan 2 sucked by the oil pump 6 is supplied to each lubrication point in the engine through the oil passage 8, the joint 10, the oil pipe 11 and the oil filter, and after lubrication, the oil pan 2 is supplied. Flow into. A part of the lubricating oil passing through the oil passage 8 reaches the inlet 29 of the lubricating oil tank 14 via the check valve 26 of the joint 10 and the bypass pipe 28, and flows into the room A1 through the pipe 30. The lubricating oil in the lubricating oil tank 14 is naturally agitated by the partition plates 15 and 16 while the chambers A1 to A2, A
Sequentially sent to 3, A4, A5.

On the other hand, the pressure inside the oil pan 2 is maintained substantially equal to the pressure inside the oil pan 2 through the ventilation communication pipe 23. Therefore, as the lubricating oil inside the oil pan 2 decreases, the lubricating oil flows from the room A5 into the oil pan 2. Are sequentially supplied.

The check valve 26 of the bypass pipe 28 prevents abnormal backflow from the lubricating oil tank 14 due to the siphon.

(Another embodiment) It can be applied to a gasoline engine.

(Effects of the Invention) According to the present invention as described above: (1) Since the lubricating oil tank 14 has a sealed structure and the ventilation communication pipe 23 maintains the same pressure as in the oil pan 2, While ensuring sufficient return of the lubricating oil from the lubricating oil tank 14 to the oil pan 2, the lubricating oil tank 14
Can be arranged in a low position, that is, on the side of the oil pan. Therefore, the entire height of the engine including the lubricating oil tank 14 can be reduced.

In particular, when it is mounted on a small vessel as shown in FIG. 2, the lubricating oil tank 14 can be stored under the deck 39 together with the cylinder block or the like, and the space of the vessel can be effectively used.

(2) Since the lubricating oil tank 14 has a closed structure, the lubricating oil in the tank 14 does not scatter to the outside even if it is shaken by waves or the like when used in a ship or the like, and the leakage of the lubricating oil from the tank 14 does not occur. Can be prevented.

(3) Since the lubricating oil tank 14 has a closed structure, the lubricating oil in the tank does not scatter outside even if it is shaken by waves or the like when it is used for a ship, etc. The distance to the wall can be shortened and the lubricating oil tank can be made smaller.

(4) Since the lubricating oil tank 14 is arranged on the side of the oil pan 2, the return pipe 21, the bypass pipe 28, the communication pipe 23, and the like can be short, and the pipes can be made easy.

By adopting the semi-dry sump type,
The height of the engine can be further reduced by making the oil pan itself shallow.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a semi-dry sump type lubricating device to which the present invention is applied, FIG. 2 is a side view showing an example arranged in a ship, and FIG. 3 is a vertical cross-sectional view of a conventional example. 1 ... Cylinder block, 2 ... Oil pan, 6 ... Oil pump, 14 ... Lubricating oil tank, 23 ... Ventilation connecting pipe, 28 ... Bypass pipe

Claims (1)

[Claims] 1. An oil pan is provided at the lower end of a cylinder block, a lubricating oil tank for a semi-dry sump is provided separately from the oil pan, and an engine-driven oil pump is arranged in the oil pan. In the semi-dry sump type lubrication system of an internal combustion engine, which communicates with each lubricating point in the engine through a passage, branches in the middle to communicate with the lubricating oil tank, and returns the oil from the lubricating oil tank to the oil pan The tank has a closed structure that is shielded from the outside air, and the upper end of the lubricating oil tank is connected to the upper end of the oil pan by a ventilation connecting pipe so that the internal pressure of the lubricating oil tank becomes the same as the internal pressure of the oil pan. Semi-dry sump type lubricator for internal combustion engines.