JPS60162005A - Device for separating oil from blow-by gas - Google Patents

Abstract

PURPOSE:To prevent the consumed quantity of oil from being increased, by performing cutting and upward bending to provide an oil drain hole of high dimensional accuracy so as to prevent the fall in the productivity of a container as a whole and keep blow-by gas from flowing back from the oil drain port. CONSTITUTION:In an oil separation device 8, blow-by gas enters through an inlet port 10 and goes out through an outlet port 7, and a curved plate shaped as a funnel and extending almost vertically is provided with oil drain ports 22-24 by cutting and upward bending, so that each oil drain port has a designed effective cross-sectional area for flow. To manufacture the oil drain ports 22-24, a flat steel plate is press-formed and a punch 31 having a tapered cutting edge is then driven at varied strokes to open downward the oil drain ports of high dimensional accuracy and designed effective cross-sectional area for flow. According to this constitution, the productivity is not deteriorated, and each oil drain port has a downward opening so that the blow-by gas dose not flow back and the consumed quantity of oil is not increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention belongs to the technical field of oil separation devices for blow-by gas.

[Prior art]

As shown in FIG. 1, an automobile engine is equipped with a blow-by gas reducing device 1 in order to prevent blow-by gas from diffusing into the atmosphere (for example, Utility Model Application No. 58-183919).

The flow high gas reduction device 1 includes a cylinder head cover 2
It has a blow-by gas passage 6 that communicates the inner space 3 with an intake passage 5 downstream of the throttle valve 4. Therefore, the blow-by gas (arrow B) existing in the space 3 inside the cylinder head cover 2 is sucked by the negative pressure generated in the intake passage 5, flows into the intake passage 5, and is returned to the engine without being diffused into the atmosphere. It will be done.

By the way, when the engine is operating, lubricating oil is circulated inside the engine. For this reason, blow-by gas (
Arrow B) necessarily contains a large amount of oil mist. When the blow-by gas (arrow B) flows into the intake passage 5- while containing such oil mist, the amount of oil consumed increases. For this reason, in the engine, an oil separation device 8 is attached to the lower proby gas outlet of the cylinder head cover 2.

Conventionally, as the oil separation device 8, one having a structure as shown in FIG. 2 has been used. Figure 2 is A of Figure 1.
- It is an enlarged view of the A cross section. However, in Figure 2, for ease of understanding, the blow-by gas population 10 in Figure 1 is
It is also depicted. The oil separator 8 shown in FIG. 2 is one for which the present applicant filed an application for utility model registration on December 16, 1981. Therefore, it should be noted that the device shown in FIG. 2 is not publicly known at the time of this application.

In FIG. 2, the oil separation device 8 is comprised of a container 15 comprising a cylinder, a bottom cover 2, and a curved plate 21 attached to the bottom surface 9 of the bottom cover 2 to the cylinder. 10 is a blow-by gas inlet, and 7 is a blow-by gas outlet. In the oil separation device 8 of FIG.
One or more oil discharge ports 12 are provided between the blow-by gas port 10 and the blow-by gas outlet lower.

The oil discharge port 12 is provided below the oil separation device 8 . Moreover, the effective flow passage cross-sectional area of each oil discharge port 12 is made smaller than the effective flow passage cross-sectional area of the blow-by gas population 10. A space 11 having a relatively large volume is defined inside the oil separation device 8 .

In the oil separation device 8 shown in FIG. 2, the blow-by gas (arrow B) that has entered the space 11 from the blow-by gas population 10 along with oil and mist is contained within the space 11 because the volume of the space 11 is relatively large. Its flow rate decreases. Therefore, the residence time of the blow-by gas (arrow B) in the space 11 becomes longer. Therefore, the oil mist contained in the blow-by gas (arrow B) falls under its own weight while the blow-by gas (arrow B) remains in the space 11. The oil that has fallen under its own weight (indicated by C in FIG. 2) is discharged from the oil discharge hole 12. In this way, blow-by gas (arrow B)
and oil (C) are separated, and the blow-by gas (arrow B
) is exhausted from the probe gas outlet lower. In this way, no increase in oil consumption occurs.

Regarding the oil discharge holes 12 of the oil separation device 8 shown in FIG. 2, the effective flow cross-sectional area of the oil discharge holes 12 close to the blow-by gas population 10 is set to be large. This translation is detailed in the utility model registration application filed by the present applicant dated December 16, 1981, so it will not be repeated here. Further, the curved plate 21 constituting the oil separation device 8 is made of a pressed steel plate. When the curved plate 21 is produced by pressing the steel plate, the oil discharge hole 12 is also press-formed at the same time.

By the way, in the oil separation device 8 shown in FIG. 2, it has been experimentally known that the size of the effective flow passage cross-sectional area of each oil discharge port 12 greatly influences the oil separation function of the oil separation device 8. There is. In other words, there is an optimum value for the effective flow passage cross-sectional area of each oil discharge port 12. Here, it can be understood from the following explanation that the effective flow passage cross-sectional area of the oil discharge port 12 has a large influence on the oil separation function of the oil separation device 8.

That is, when the amount of blowby gas generated by the engine is large, a larger amount of blowby gas (arrow B) than the blowby gas population 10 flows into the space 11 in FIG. Therefore, a large amount of oil is separated and produced in the space 11. In this case, if the effective flow path cross-sectional area of the oil discharge hole 12 is small, the amount of oil separated and produced within the space 11 will be greater than the amount of oil discharged from the oil discharge hole 12. Therefore, oil is accumulated in the space 11. When the amount of accumulated oil increases, the accumulated oil is discharged from the blow-by gas outlet lower part along with the blow-by gas (arrow B).

Thus, in the oil separation device 8 shown in FIG. 2, if the effective flow passage cross-sectional area of the oil discharge hole 12 is smaller than the appropriate value 1, a phenomenon occurs in which the amount of oil consumed increases.

On the other hand, if the effective flow path cross-sectional area of the oil discharge hole 12 is larger than the appropriate value, even when a large amount of oil is separated and produced in the space 11 (i.e., when a large amount of blow-by gas is generated), as described above, Also, the oil discharge hole 12 may not be properly blocked with oil. Therefore, blow-by gas flows into the space 11 from the oil discharge hole 12 . When the blow-by gas flows backward from the oil discharge hole 12, especially regarding the oil discharge hole 13 which is close to the lower proveby gas outlet, the distance from this oil discharge hole 13 to the lower proveby gas outlet is short. Regarding the gas, the residence time of the blow-by gas in the space 11 becomes shorter. The shorter residence time of the blow-by gas in the space 11 means that the blow-by gas is discharged from the blow-by gas outlet lower while the oil mist has not completely fallen. Naturally, this results in an increase in oil consumption.

[Problems with conventional technology]

In the conventional oil separation device 8 shown in FIG. 2, the size of the effective flow passage cross-sectional area of the oil discharge hole 12 is as follows.
It is determined to be an optimum value so that the oil separation device 8 can exhibit a sufficient oil separation function. However, the second
The conventional oil separation device 8 shown in the figure has a problem in that its original oil separation function may not be fully exhibited, resulting in an increase in oil consumption. This is due to the following reason.

That is, as described above, the size of the effective flow passage cross-sectional area of the oil discharge hole 12 is determined to be an optimum value so that the oil separation device 8 can exhibit a sufficient oil separation function. Therefore, if the effective flow passage cross-sectional area of each oil discharge hole 12 completed as a product achieves the designed value, the oil separation device 8 will perform its original oil separation function as planned. . Therefore, the above problem does not occur at all. However, the oil discharge hole 12 is made by press-forming the steel plate as described above. Therefore, some degree of variation in the shape and dimensions of each oil discharge hole 12 is unavoidable, and the influence of this variation is particularly noticeable in the oil discharge hole 13 having a small effective flow passage cross-sectional area. For this reason, the above-mentioned problems arise.

One way to prevent the occurrence of such defects as much as possible is to perform strict quality control in the L-nosing process of the oil discharge hole 12. however,
For this purpose, a lot of time is required in the process of forming the oil discharge hole 12, and the productivity of the entire curved plate 21 including the oil discharge hole 12 is reduced. Naturally, the yield rate also becomes worse. Furthermore, since the above-mentioned variations are inherent in the press molding method itself,
This method has its limitations.

The second method is to prevent the above-mentioned problem from occurring. However, this method has the following drawbacks.

That is, in the curved plate 21 of FIG. 2, the wall 34 of the curved plate 21 that reaches the oil discharge hole 12 is shaped like a funnel and extends in a substantially vertical direction (in the direction of arrow Q) along the cylinder head cover 2.
It is said to have an elongated shape.

For this reason, in the curved plate 21, the vertical direction (direction of arrow Q)
However, as shown in FIG.
will be formed.

However, when the oil discharge hole 12 opens in the horizontal direction, the oil discharge hole 12 is not properly blocked by oil when the engine is operating, and the oil may instead flow into the blow-by gas space 11 from the oil discharge hole 12 . As can be seen from the comparison with Figures 4 and 5, this is the direction in which the oil falls (
This is because the direction of arrow Q) and the opening direction of the oil discharge hole 12 (see arrow R in FIG. 5) are different. In addition, the fourth
The figure is an enlarged view of the IV-IV cross section in FIG. 2, and FIG. 5 is an enlarged view of the section -V in FIG. 3. Further, in FIG. 5, arrows indicate blow-by gas flowing backward. As shown in FIG. 5, when the blow-by gas (arrow D) flows backward from the oil discharge hole 12, the amount of oil consumed increases as described above, leading to the loss of the original function of the oil separation device 8. .

[Purpose of the invention]

The present invention has been made to solve these problems of the prior art.

An object of the present invention is to enable an oil separation device for blow-by gas to fully exhibit its original oil separation function without causing a decrease in productivity.

[Structure of the invention]

This object is achieved according to the invention by a blow-by gas oil separation device having the following construction.

That is, the blow-by gas oil separation device according to the present invention is a blow-by gas oil separation device consisting of a closed container. A space is defined in the container, and the container is provided with a blow-by gas inlet and a blow-by gas outlet communicating with the space, and the blow-by gas inlet and the blow-by gas outlet are spaced apart from each other at a predetermined interval in a substantially horizontal direction. The container is provided with one or more oil drain holes opening downwardly between the blow-by gas inlet and the blow-by gas outlet, the oil drain hole being spaced apart from the blow-by gas inlet and blow-by gas outlet. The passage cross-sectional area is made smaller than the effective passage cross-sectional area of the blow-by gas inlet, and the effective passage cross-sectional area of the oil discharge hole near the blow-by gas inlet is made larger, and the oil discharge hole is characterized in that it is made of cut-and-raised holes created by cutting and raising the wall of the container.

[Action of the invention]

In the present invention having such a configuration, the oil discharge hole is formed not by press molding but by cutting and raising the wall of the container. As is well known, the dimensional accuracy of holes made by cutting and raising is extremely high. Therefore, the effective flow passage cross-sectional area of the oil discharge hole becomes a predetermined design value.

Moreover, the cutting and raising operation itself is extremely easy, and the productivity of the container as a whole is hardly reduced because of this.

Further, in the present invention, the oil discharge hole opens downward. Therefore, blow-by gas does not flow back from the oil discharge hole, thereby preventing an increase in oil consumption.

Note that the cutting and raising is normally performed in the horizontal direction on the wall of the container that extends substantially vertically along the inner wall surface of the rad cover toward the cylinder. Therefore, when an oil discharge hole is created by cutting and raising, the opening of the oil discharge hole inevitably faces downward.

〔Effect of the invention〕

Thus, according to the present invention, it is possible to fully exhibit the original oil separation function without causing a decrease in productivity.

〔Example〕

Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 6 is a longitudinal sectional view of one embodiment of the present invention.

FIG. 6 is, for example, an enlarged view of the AA cross section in FIG. 1. In FIG. 6, 2 is a rad cover for the cylinder;
21 is a curved plate that constitutes the oil separation device 1B. By attaching the curved plate 21 to the inner wall surface 9 of the cylinder head cover 2, the cylinder head cover 2 and the curved plate 2
1 forms a closed container 15. Oil separation device 8
is made up of such a container 15.

7 is a blow-by gas outlet, and 10 is a blow-by gas inlet. The blow-by gas outlet lower is provided on the cylinder head cover 2, and the blow-by gas outlet 10 is composed of the cylinder head cover 2 and a curved plate 21. The blow-by gas population 10 and the blow-by gas outlet lower are spaced apart from each other by a predetermined distance in the substantially horizontal direction as much as possible. A relatively large volume space 11 is defined inside the container 15.

In the curved plate 21, there are three oil discharge holes 22.2 between the blow-by gas population 10 and the blow-by gas outlet lower.
3.24 is provided. In addition, in this embodiment, these oil discharge holes 22, 23, and 24 are sequentially designated as the first oil discharge hole, the second oil discharge hole, and the third oil discharge hole from the one closest to the blow-by gas population of 10. Name it. Therefore, the first oil discharge port 22 is located at the farthest position from the proveby gas outlet lower. Further, the third oil discharge hole 24 is located closest to the lower proveby gas outlet. The oil drain holes 22, 23, 24 are all provided below the container 15. In addition, the oil discharge hole 22
．． The curved plate 21 reaching 2315.24 is shaped like a funnel and extends substantially vertically (direction of arrow Q) along the inner wall surface 9 of the rad cover 2 toward the cylinder. Oil drain hole 22.2
3.24 is located approximately on a straight line that is substantially parallel to the straight line connecting blow-by gas population 10 and blow-by gas outlet 7 da.

As shown in FIG. 7, the oil drain hole 22 of FIG.
23 and 24 are cut and raised holes made by cutting and raising the curved plate 21 in a substantially horizontal direction (direction of arrow R). Note that FIG. 7 is a perspective view of the curved plate 21 of FIG. 6 viewed from the back side of the page. Therefore, in Figure 6,
The oil discharge holes 22, 23, and 24 protrude horizontally toward the back side of the page. In Figure 7 (or Figure 6), cut up 22.23.24)
is made on the wall 34 of the curved plate 21. Here, the wall 34 of the curved plate 21 extends downward (in the direction of arrow Q) in a funnel shape along the inner wall surface 9 of the rad cover 2 toward the cylinder. Therefore, as shown in FIG. 8, the wall 34 of the cut and raised curved plate 21 extends substantially horizontally (in the direction of arrow R), and therefore the openings 25 of the cut and raised holes (22, 23, 24) It opens downward (in the direction of arrow Q).

Returning to Figure 6, which oil drain hole 22.23.2
4 as well, its effective passage cross-sectional area is made smaller than the effective passage cross-sectional area of the blow-by gas inlet 10. Regarding the oil discharge holes 22, 23, and 24, each effective flow cross-sectional area is the largest for the first oil discharge hole 22, and the third
The oil discharge hole 24 is the smallest. Second
The effective flow passage cross-sectional area of the oil discharge hole 23 is set to a value exactly between those of the first oil discharge hole 22 and the third oil discharge hole 24.

When manufacturing the oil separation device 8 in this embodiment, first a curved plate 21 having a shape as shown in FIG. 6 is manufactured by press forming a flat steel plate. Next, cut and raise the oil discharge holes 22, 23, 2 in the curved plate 21.
4 will be provided.

The work of creating cut and raised holes (22, 23, 24) as shown in FIG. 7 in the curved plate 21 is as shown in FIG. 9 (a).
A punch 31 having a tapered blade 36 as shown in ) is used. Then, as shown in FIG. 6(b), the punch 31 is moved in the direction of arrow R to cut and raise the curved plate 21. In addition, in FIG. 6(b), 32 is a cutting edge and 33 is a die. The oil discharge hole (ie, the first oil discharge hole 22) having a large effective flow cross-sectional area shown in FIG. 7 is created by increasing the stroke of the punch 31 in FIG. 9(b). Further, the oil discharge hole having a small effective flow passage cross-sectional area (i.e., the third oil discharge hole 24) shown in FIG.
It is completed by taking small strokes. Therefore, in this embodiment, all the oil discharge holes 22.
23 and 24 can be made using the same punch 31.

As mentioned above, in this embodiment, the oil discharge hole 22.2
3.24 is made by cutting and raising rather than press molding. (As is known, the dimensional accuracy of the holes drilled by cutting and raising is extremely high. For this reason, for the oil discharge holes 22, 23, 24, the third oil, which awaits a small effective flow cross-sectional area, The discharge hole 24 also has a predetermined design value.

Moreover, the cutting and raising work itself is extremely easy, and therefore there is almost no decrease in productivity when making the curved plate 21.

In addition, in this embodiment, the oil discharge holes 22, 23.
24, as shown in FIG. 6, horizontally ( It is made by cutting and raising it in the direction of arrow R in Fig. 8). Therefore, as shown in FIG.
The opening 25 of the oil discharge hole 24 (same for 22 and 23) faces downward (in the direction of arrow Q). For this reason,
When the engine is operating, the third oil discharge hole 24 is completely blocked by the oil C that also falls downward (in the direction of arrow Q). vl is the third oil discharge hole 24
Therefore, in this embodiment, no increase in oil consumption due to blow-by gas backflow occurs.

Thus, according to this embodiment, the oil separation device 8 for blow-by gas has the effect of being able to fully exhibit its original oil separation function without causing a decrease in productivity.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an engine equipped with a blow-by gas reduction device, Fig. 2 is a longitudinal sectional view of a conventional blow-by gas oil separation device (unknown), and Fig. 3 is a longitudinal sectional view of an engine equipped with a blow-by gas reduction device. A vertical cross-sectional view of a blow-by gas oil separation device (unknown), FIG. 4, is the It of FIG.
FIG. 5 is an enlarged view of the V-V cross section of FIG. Figure 7 is a perspective view of the curved plate in Figure 6, Figure 8 is an enlarged cross-sectional view taken along
) is a perspective view of the punch. FIG. 9(b) is an explanatory diagram of the cutting and raising operation using the punch. 2・-11111 Cylinder head cover 7------
-Blow-by gas outlet 8--Oil separation device 10--Blow-by gas inlet 11--Space 15--Container

Claims (1)

[Claims] A blow-by gas oil separation device comprising a closed container, the container being disposed within a cylinder head cover of an engine, a space being defined inside the container, and a space being defined in the container. A blow-by gas inlet and a blow-by gas outlet are provided which communicate with each other, and the blow-by gas inlet and the blow-by gas outlet are spaced apart from each other by a predetermined distance in a substantially horizontal direction. In between, the container is provided with one or more oil discharge holes opening downward, and the effective flow cross-sectional area of the oil discharge holes is larger than the effective flow cross-sectional area of the blow-by gas inlet. The oil discharge hole is small in size and has a large effective flow cross-sectional area near the blow-by gas inlet,
An oil separation device for blow-by gas, characterized in that the oil discharge hole is a cut-and-raised hole created by cutting and raising the wall of the container.