JPH07332056A - Oil pan of internal combustion engine - Google Patents

Abstract

PURPOSE:To provide an oil pan capable of sucking lubricating oil without sucking air from an oil strainer even if the oil level of lubricating oil stored in the oil pan is inclined. CONSTITUTION:In an oil pan 1 of an internal combustion engine, provided on the lower part of a cylinder block 91, and in which an oil strainer 2 for supplying lubricating oil to an engine is arranged, the inside of the oil pan 1 is sectioned into a first chamber 20 and a closed pressurizing chamber 30 by a section member 3. A pressurizing device 5 for pressurizing air on the upper surface of lubricating oil is connected to the pressurizing chamber 30. A suction port 21 of the oil strainer 2 is opened to the first chamber 20. Moreover, the suction member 3 is provided with an introducing port 31 through which lubricating oil is allowed to flow in or out between the pressurizing chamber 30 and the first chamber 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an oil pan for an internal combustion engine,
Particularly, it relates to a structure capable of following the fluctuation of the oil level.

[0002]

2. Description of the Related Art As shown in FIG. 6, an oil pan 9 of an internal combustion engine provided in a vehicle 99 is provided with a cylinder block 91.
The lubricating oil 9 provided under the oil pan 9 and stored in the oil pan 9
An oil strainer 2 for supplying 0 to the engine is provided. The suction port 21 of the oil strainer 2 is opened in the lubricating oil stored in the oil pan 9. The oil strainer 2 sucks up the lubricating oil 90 by the oil pump 28 connected to the upper portion thereof and sends it to the lubricating parts of the internal combustion engine in the cylinder block 91. Further, the lubricating oil 90 used in each lubrication part falls into the oil pan 9.

[0003]

[Problems to be Solved] However, the conventional oil pan 9 has the following problems. That is, as shown in FIG. 7, when the vehicle 99 loaded with the internal combustion engine leans, or when the vehicle suddenly turns or accelerates / decelerates, the oil level of the lubricating oil 90 fluctuates to, for example, the oil level position 10. Lean.

Therefore, a part of the suction port 21 of the oil strainer 2 may come out to the space above the oil surface.
As a result, air may be sucked from the suction port 21 of the oil strainer 2, and the oil pump 28 may not be able to pump the lubricating oil 90 to each lubrication portion of the internal combustion engine, which may cause problems such as poor lubrication. Further, the above-mentioned problem is caused by the fluctuation of the oil level during traveling even when the amount of the lubricating oil is reduced, even if the vehicle is not so inclined.

Therefore, it is conceivable to solve the above problem by deepening the oil pan to store a large amount of lubricating oil 90 and making the oil level position sufficiently higher than the suction port 21 of the oil strainer 2. . However, there is a strong demand for downsizing of the internal combustion engine, and there is a limit to deepening the oil pan in this way.

The present invention has been made in view of the above conventional problems, and even if the oil level of the lubricating oil changes, the lubricating oil can be sucked in without sucking air from the oil strainer, and The purpose of the present invention is to provide an oil pan that can have a shallow depth.

[0007]

According to the present invention, an oil pan of an internal combustion engine is provided below a cylinder block and is provided with an oil strainer for supplying lubricating oil to the engine. It is divided into a first chamber and a closed pressure chamber by a member, and a pressure device for pressurizing the air on the upper surface of the lubricating oil is connected to the pressure chamber, and the first chamber is connected to the first chamber. An oil pan for an internal combustion engine, characterized in that the suction port of the oil strainer is opened, and the partition member is provided with a conduction port through which lubricating oil flows in and out between the pressurizing chamber and the first chamber. is there.

What is most noticeable in the present invention is that the inside of the oil pan is divided by the partition member into the first chamber,
It is divided into a closed pressure chamber, a pressure device is connected to the pressure chamber, an intake port of the oil strainer is opened in the first chamber, and the pressure chamber and the first chamber are also opened. There is a through hole between and.

The pressurizing chamber pressurizes air on the upper surface of the lubricating oil in the pressurizing chamber when the liquid level of the lubricating oil is lowered, and sends the lubricating oil to the first chamber through the communicating port. It is a room. A pressurizing device is connected to the pressurizing chamber. As the pressurizing device, for example, an accumulator as shown in the second embodiment, a compressor, a pressurized air cylinder or the like is used.

Among them, the accumulator is connected to the discharge port of the vacuum pump of the power steering in the vehicle, for example, and stores the discharge air pressure of this vacuum pump (see the embodiment). In this case, the power steering mounted on the vehicle can be used, and there is no need to separately provide a power source dedicated to the pressurizing chamber. Therefore, the cost is low and it is compact.

Further, as an oil pan having another structure, an oil pan of an internal combustion engine is provided below the cylinder block and is provided with an oil strainer for supplying lubricating oil to the engine. Is an oil pan for an internal combustion engine, characterized in that the inside of the oil pan including the suction port of the oil strainer is divided into a plurality of parts, and a partition wall higher than the oil level at the time of inclination is provided.

The partition wall divides the interior of the oil pan into, for example, the left-right direction of the vehicle or the front-rear direction thereof. As a result, it is possible to cope with the fluctuation of the oil level due to the inclination of the vehicle in the left-right direction or the front-rear direction, and it is possible to prevent the intake of air into the oil strainer. Also, the oil pan becomes compact.

Even when a plurality of partition walls are provided as described above, the interior of the oil pan is divided into a first chamber and a closed pressure chamber by a partition member.
A pressurizing device for pressurizing the air on the upper surface of the lubricating oil is connected to the pressurizing chamber, the suction port of the oil strainer is opened in the first chamber, and the pressurizing chamber is provided in the partition member. It is also possible to provide a structure of an oil pan of an internal combustion engine, which is characterized in that a conduction port through which lubricating oil flows in and out is provided between and the first chamber.

In this case, by forming the partition wall, the pressurizing chamber, and the first chamber, an oil pan exhibiting more excellent effects such as coping with the above-mentioned oil level fluctuation and downsizing. You can do it. Further, in any of the above oil pans, it is preferable that the partition member is provided with a pressure adjusting valve for adjusting the air pressure between the pressurizing chamber and the first chamber. Thereby, the differential pressure between the pressurizing chamber and the first chamber can be appropriately maintained.

[0015]

In the oil pan of the internal combustion engine of the present invention, the air in the pressurizing chamber is pressurized by the pressurizing device, for example, when the vehicle leans. As a result, the air pressure in the pressurizing chamber becomes higher than the air pressure in the first chamber. Here, the partition member that separates the pressurizing chamber and the first chamber is provided with a conduction port through which lubricating oil flows in and out. Therefore, the lubricating oil in the pressurizing chamber passes through the communicating port and flows into the first chamber. Therefore, the oil level position of the first chamber is higher than the oil level position before pressurization.

Therefore, when the vehicle on which the internal combustion engine is loaded tilts, or when the vehicle sharply turns or accelerates / decelerates, the suction port of the oil strainer always keeps the oil level even if the oil level in the oil pan tilts. Maintained below. Therefore, the suction port of the oil strainer does not come out into the space above the oil surface of the lubricating oil, and the lubricating oil can be constantly sucked without sucking air from the suction port of the oil strainer.

Therefore, the lubricating oil can be pressure-fed to each lubrication portion of the internal combustion engine without interruption. Also, because of that,
The depth of the oil pan can be designed to be shallow. The same applies to the case where the amount of lubricating oil in the oil pan decreases and the oil level drops.

As described above, the present invention has been made in view of the above-mentioned conventional problems. Even if the oil level of the lubricating oil fluctuates, the lubricating oil can be sucked in without sucking air from the oil strainer. In addition, it is possible to provide an oil pan capable of reducing the depth of the oil pan.

[0019]

【Example】

Embodiment 1 Regarding the oil pan of the internal combustion engine according to the embodiment of the present invention,
This will be described with reference to FIG. As shown in FIG. 1, the oil pan of the internal combustion engine of this example is provided below a cylinder block 91 and is provided with an oil strainer 2 for supplying lubricating oil 90 to the engine.
In the above, the inside of the oil pan 1 is partitioned by the partition member 3 into the first chamber 20 and the closed pressure chamber 30. A pressurizing device 5 for pressurizing air on the upper surface of the lubricating oil is connected to the pressurizing chamber 30, the suction port 21 of the oil strainer 2 is opened in the first chamber 20, and the partitioning member 3 is connected. A communication port 31 through which lubricating oil flows in and out is provided between the pressurizing chamber 30 and the first chamber 20.

The partition member 3 includes a vertical cylindrical portion 305,
The ceiling plate 306 is formed so as to be expanded outwardly at the upper portion, and a communication port 31 that communicates between the first chamber 20 and the pressurizing chamber 30 is provided below the ceiling plate 306. The pressure chamber 30 and the pressure device 5 are connected by a hose 58. As the pressurizing device 5, for example, the accumulator shown in the second embodiment is used (second embodiment).
reference). The partition member 3 has a ceiling plate 306.
Further, it has a pressure adjusting valve 59. The pressure regulating valve is the first chamber 2
This is for keeping the pressure difference between 0 and the pressurizing chamber 30 so as not to become excessive.

Next, the function and effect of this example will be described.
In the oil pan 1 of the internal combustion engine of this example, when the vehicle tilts and the oil surface 310 of the lubricating oil 90 tilts, first, the air in the pressure chamber 30 is pressurized by the pressure device 5. As a result, the air pressure in the pressurizing chamber 30 is set to the first chamber 2
Higher than zero air pressure. Here, between the pressurizing chamber 30 and the first chamber 20, a conduction port 31 through which lubricating oil flows in and out is provided.

Therefore, the lubricating oil 90 in the pressurizing chamber 30 is
Passes through the communication port 31 of the partition member 3 and passes through the first chamber 20.
Flow into. Therefore, the oil level position 3 of the pressurizing chamber 30 is
11 is lower than the oil level position 310 before pressurization, while the oil level position 211 of the first chamber 20 is the oil level position 2 before pressurization.
It will be higher than 10.

Therefore, when the vehicle loaded with the internal combustion engine leans, or when the vehicle suddenly turns or accelerates / decelerates, the lubricating oil 9 stored in the oil pan 1 is stored.
Even if the oil level of 0 tilts, the suction port of the oil strainer can always be kept in the lubricating oil. That is, in the conventional case, as is known from the oil surface position 350 at the time of inclination shown in FIG. 1, a part of the suction port 21 of the oil strainer 2 may come out to a space above the oil surface. In the above, the first chamber 2
The oil level position 251 of 0 is higher than the conventional oil level position 250.

Therefore, part of the suction port 21 of the oil strainer 2 does not come out into the space above the oil surface of the lubricating oil, and air is not sucked from the suction port 21 of the oil strainer 2. Therefore, the lubricating oil 90 can be always sucked and the lubricating oil can be pressure-fed to each lubrication portion without interruption. Therefore, the oil pan can be designed to have a shallow depth.

Further, these effects are the same when the amount of lubricating oil in the oil pan is reduced by its use and the oil surface position is lowered. In this example, the pressure control valve 5
Since 9 is provided, it is possible to prevent the pressure difference between the first chamber 20 and the pressurizing chamber 30 from becoming abnormally large.

As described above, according to this embodiment, even if the oil level of the lubricating oil stored in the oil pan is tilted or the amount of lubricating oil is decreased, that is, the oil level is changed, the oil It is possible to provide an oil pan that can suck the lubricating oil and can make the depth of the oil pan shallow without sucking air from the suction port of the strainer.

Second Embodiment In this embodiment, as shown in FIG. 2, an accumulator 54 is used as the pressurizing device 5 in the oil pan of the first embodiment. That is, in the present embodiment, the pressurizing device 5 includes the accumulator 54, the vacuum pump 51 provided in the power steering of the vehicle, and the check valve 52 interposed therebetween.
It has a first three-way valve 53. In addition, the accumulator 54
A relief valve 56 is provided in the. A second three-way valve 55 and a pipe 550 are provided between the first three-way valve 53 and the pressurizing chamber 30.

The check valve 52 is connected to the discharge side of the vacuum pump 51. An oil amount detector 18 having a float 181 is arranged in the first chamber 20. Others are the same as in the first embodiment.

Next, the function and effect of this example will be described. First,
Normally, the first three-way valve 53 connects the discharge port of the vacuum pump 51 with the accumulator 54. for that reason,
When the vacuum pump 51 operates during the operation of the power steering, the discharge port of the vacuum pump 51 has a positive pressure. Therefore, through the check valve 52 and the first three-way valve 53,
Pressurized air from the vacuum pump 51 is stored in the accumulator 54.
It flows into the inside and accumulates pressure there.

On the other hand, the second three-way valve 55 is normally connected to the nozzles 551 and 552, and the first chamber 2 of the oil pan
0 and the pressurizing chamber 30 are maintained at the same pressure. In the oil amount detector 18, the float 181 moves up and down according to the oil surface position to detect the lubricating oil amount, that is, the oil surface.

Then, when the oil amount detector 18 detects that the lower limit oil level position 361 is, for example, slightly higher than the height of the suction port 21 of the oil strainer 2, the first three-way valve 53 is notified by the signal. The second three-way valve 55 operates. Then, the accumulator 54 and the pressurizing chamber 30 are communicated with each other. Therefore, the pressurizing chamber 30 of the oil pan is pressurized, and the low oil surface position 360 is set in the pressurizing chamber 30, while the high oil surface position 362 is set in the first chamber 20.

When the oil level of the first chamber 20 rises due to the pressurization and reaches the oil level position 363 of the upper limit setting, the signal from the oil amount detection causes the first and second three-way valves 53, 55 operates and stops the introduction of the pressurized air from the accumulator 54. Further, when the above-mentioned lower limit or upper limit oil surface positions 361 and 363 are detected, the operator of the vehicle is also warned by a red lamp, a buzzer or the like.

As described above, according to this example, the pressurizing chamber 30
Pressurized air for pressurizing the vehicle can be utilized by the accumulator 54 and further by the power steering vacuum pump 51 installed in the vehicle. Therefore, it is not necessary to newly provide a special source for the supply of pressurized air, and the pressurizing device becomes compact. In addition, Example 1
It is possible to obtain the same effect as the above.

Embodiment 3 In this embodiment, as shown in FIGS. 3 to 5, in the oil pan 1 of the internal combustion engine of the embodiment 1, the oil strainer 2 is used.
The inside of the oil pan 1 including the suction port 21 is divided into two, and the partition wall 4 which is higher than the oil level at the time of inclination is provided. The partition wall 4 is the first chamber shown in the first embodiment.
The chamber 20a and the chamber 20b are separated, and the pressurizing chamber is
It is separated into a and 30b (Fig. 5).

As shown in FIG. 4, the partition wall 4 does not reach the upper end of the pressurizing chamber 30, and the air portion on the upper surface of the lubricating oil in the pressurizing chamber 30 is not separated. That is, the pressurizing chamber 3
The upper part of 0 is above the partition wall 4 and forms a common space portion. In addition, as shown in FIGS.
Is arranged so that the portion below the oil surface when inclined is completely divided into two. Others are the same as in the first embodiment.

Next, as shown in the first embodiment, the oil level positions of the first chambers 20a and 20b are adjusted by pressurizing by the pressurizing device 5 so that the pressure levels of the first chambers 20a and 20b are increased.
It becomes higher than the oil level position of b. Further, since the first chamber 20 and the pressurizing chamber 30 are divided into two by the partition wall 4, the lubricating oil on the left and right of the partition wall 4 does not come in and out through the partition wall 4.

Therefore, when the oil surface of the lubricating oil in the oil pan 1 tilts in the left-right direction in FIG. 3, the oil surfaces of the first chamber 20a and the pressurizing chamber 30a on the right side of the partition wall 4 are pressurized. The oil level position 240a is set in the state where the oil level is not set. However, due to being pressurized, the oil level of the first chamber 20a actually becomes the oil level position 255a higher than the oil level position 240a, and the oil level of the pressurizing chamber 30a is lower than the oil level position 240a. It becomes the position 355a.

Similarly, the first chamber 20 on the left side of the partition wall 4
The oil level of b is higher than the oil level 240b, and the oil level is 255b.
Therefore, the oil surface position 355b of the pressurizing chamber 30b is at the position 240
It becomes lower than b. Therefore, the suction port 21 of the oil strainer 2 is always maintained below the oil level.

Therefore, a part of the suction port 21 of the oil strainer 2 does not come out into the space above the oil surface of the lubricating oil, and the lubricating oil can be pressure-fed to each lubricating portion without interruption. Therefore, according to this example, it is possible to prevent air suction from the oil strainer more stably than in the first embodiment. Moreover, the same effect as that of the first embodiment can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an oil pan of an internal combustion engine according to a first embodiment.

FIG. 2 is a sectional view of an oil pan of an internal combustion engine according to a second embodiment.

FIG. 3 is a sectional view of an oil pan of an internal combustion engine according to a third embodiment.

FIG. 4 is a sectional view taken along the line BB of FIG.

5 is a sectional view taken along the line AA of FIG.

FIG. 6 is an explanatory view of an oil pan of an internal combustion engine in a conventional example.

FIG. 7 is an explanatory view showing a problem of the oil pan of the internal combustion engine in the conventional example.

[Explanation of symbols]

 1. ． ． Oil pan, 2. ． ． Oil strainer, 20. ． ． First room, 21. ． ． Oil strainer inlet, 3. ． ． Partition member, 30. ． ． Pressure chamber, 4. ． ． Partition wall, 5. ． ． Pressurizing device, 59. ． ． Pressure regulating valve, 90. ． ． Lubricant,

Claims (4)

[Claims] 1. An oil pan for an internal combustion engine, which is provided below a cylinder block and is provided with an oil strainer for supplying lubricating oil to an engine, wherein the inside of the oil pan is divided by a partition member into a first chamber. And a closed pressurizing chamber, a pressurizing device for pressurizing the air on the upper surface of the lubricating oil is connected to the pressurizing chamber, and the first strainer suctions the oil strainer. An oil pan for an internal combustion engine, characterized in that a port is opened, and that the partition member is provided with a conduction port through which lubricating oil flows in and out between the pressurizing chamber and the first chamber. 2. An oil pan of an internal combustion engine, which is provided below a cylinder block and is provided with an oil strainer for supplying lubricating oil to an engine, wherein the oil pan includes an intake port of the oil strainer. The oil pan of the internal combustion engine is characterized in that the inside of the oil pan is divided into a plurality of parts and a partition wall that is higher than the oil level when tilted is provided. 3. The oil pan according to claim 2, wherein the interior of the oil pan is partitioned by a partition member into a first chamber and a closed pressure chamber, and the pressure chamber contains air on the upper surface of the lubricating oil. A pressure device for pressurizing the oil is connected, the suction port of the oil strainer is opened in the first chamber, and the partition member is filled with lubricating oil between the pressure chamber and the first chamber. An oil pan for an internal combustion engine, which is provided with a communication port for entering and exiting. 4. The internal combustion engine according to claim 1, wherein the partition member is provided with a pressure adjusting valve for adjusting a pressure difference of air between the pressurizing chamber and the first chamber. Oil pan.