JPH0968024A - Baffle plate structure for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an air entraining ratio without enlargement by providing an inclined baffle plate. SOLUTION: An auxiliary baffle plate 16 is provided being inclined so that a part covering the upper part of an oil strainer 3 is positioned higher than a part overlapped with a baffle plate 6. Out of oil fed to each part such as a crankshaft 13, a cylinder liner 14 and a piston 15, oil flowing down a second oil return passage 8 opened onto the oil strainer 3 falls down on the auxiliary baffle plate 16 and flows down to the baffle plate 6 so as to be returned to an oil pan 1 through a part, spaced from the oil strainer 3, of the baffle plate 6. Even in the case of bubbles being generated, the bubbles are restrained from being entrained into the oil 2 at the time of the oil pump 5 sucking the oil 2 through the oil strainer 3 so as to reduce an air entraining ratio.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a baffle plate structure for an internal combustion engine.

[0002]

2. Description of the Related Art An example of a conventional baffle plate structure for an internal combustion engine is shown in FIG. In the figure, the oil pan 1 is attached to the lower portion of a crankcase formed on the lower side of a cylinder block (not shown) by fastening means (not shown) such as bolts with a gasket (not shown) interposed. An oil strainer 3 is arranged in the oil 2 stored in the oil pan 1. An oil pump 5 is connected to the oil strainer 3 via a strainer pipe 4. A baffle plate 6 is provided so as to partition the oil pan 1 side portion and the crankcase side. The baffle plate 6 is welded to the wall surface of the oil pan 1.

In this case, after assembling the oil pump 5 and the oil strainer 3, in order to assemble the oil pan 1 having the baffle plate 6 welded thereto, the baffle plate 6 is attached to the oil pump 5 and the oil strainer. 3 has a shape in which an upper part of the oil pump 3 is cut off (that is, the baffle plate 6 is formed by the oil pump 5).
Also, the oil pan 1 side portion and the crankcase side except for the oil strainer 3 arrangement portion are partitioned from each other) so that they do not interfere with each other during assembly.

In the baffle plate structure of the internal combustion engine, the oil 2 stored in the oil pan 1 is sucked up by the oil pump 5 via the oil strainer 3 and supplied to each of the crankshaft, cylinder liner, piston and the like (not shown). Lubricate and cool each part. The oil supplied to each part is the first, second and third oil return passages 7,
It flows down through 8 and 9. Where the first, second and third
The lower openings of the oil return passages 7, 8 and 9 face the baffle plate 6, the vicinity of the oil strainer 3 and the vicinity of the oil pump 5, respectively.

The oil flowing down through the first oil return passage 7 flows over the baffle plate 6 and then returns to the oil pan 1 through a tubular portion 6b formed in the wall side portion of the oil pan 1 in the baffle plate 6. Be done. Further, the oil flowing down through the second and third oil return passages 8 and 9 is
It flows down to the liquid surface of the oil 2 in the oil pan 1 with a predetermined drop.

[0006]

In the baffle plate structure of the internal combustion engine, the opening 8a of the second oil return passage 8 is near the oil strainer 3 and the oil stored in the oil pan 1 is stored in the oil pan 1. There is a predetermined drop between the second liquid surface and the second liquid surface. Therefore, when the oil flowing down the second oil return passage 8 falls on the liquid surface of the oil 2 stored in the oil pan 1, bubbles are easily generated, and the bubbles are mixed into the oil 2 and the oil strainer 3 There is a possibility that the oil may be sucked up by the oil pump 5 and the aeration rate of the oil 2 (so-called aeration) may become high.

As a measure against the above-mentioned problems, it is conceivable that the oil pan 1 is deep and the oil strainer 3 is separated from the liquid surface to suppress mixing of bubbles. However,
In this case, the size of the entire engine is increased, and it cannot be an appropriate improvement measure.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a baffle plate structure for an internal combustion engine which can reduce the air mixing ratio without increasing the size.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is an internal combustion engine provided with a baffle plate so as to partition the crankcase side from the oil pan side portion excluding the oil pump and the oil strainer arrangement portion. In the baffle plate structure of, the hole for inserting the strainer tube that connects the oil strainer and the oil pump is formed,
The strainer tube is inserted through the hole, and a part of the strainer tube overlaps the baffle plate and another part covers the upper part of the oil strainer, and the other part is inclined to a higher level than the part. It is characterized in that an auxiliary baffle plate is provided. In this case, ribs extending upward and downward may be provided at the respective ends of the overlapping portions of the baffle plate and the auxiliary baffle plate. Here, the level means a vertical positional relationship.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A baffle plate structure for an internal combustion engine according to an embodiment of the present invention will be described below with reference to FIGS. It should be noted that the illustration and description of members and parts equivalent to those shown in FIG. 12 are omitted as appropriate.

In FIGS. 1 and 2, the oil pan 1 includes a bolt 1 with a gasket (not shown) sandwiched under a crankcase 11 formed on the lower side of the cylinder block 10.
It is installed at 2. An oil strainer 3 is arranged in the oil 2 stored in the oil pan 1. An oil pump 5 is connected to the oil strainer 3 via a strainer pipe 4. A baffle plate 6 is provided so as to partition the oil pan 1 side portion and the crankcase 11 side. The baffle plate 6 is welded to the oil pan 1.

In this case, the baffle plate 6 is attached, and the upper parts of the oil pump 5 and the oil strainer 3 are cut off (that is, the baffle plate 6 includes the oil pump 5 and the oil strainer 3). The oil pan 1 side portion excluding the arrangement portion and the crank case 11 side are partitioned from each other) so that they do not interfere with each other during assembly.

In the baffle plate structure of the internal combustion engine, the oil 2 stored in the oil pan 1 is sucked up by the oil pump 5 via the oil strainer 3 and supplied to the crankshaft 13, the cylinder liner 14, the piston 15 and the like. As a result, each part is lubricated and cooled.
The oil supplied to each part flows down through the first, second, and third oil return passages 7, 8, 9 as shown in FIGS. 1 and 3.

In the baffle plate structure of this internal combustion engine, an auxiliary baffle plate 16 is further provided so as to cover the upper portion of the oil strainer 3 as shown in FIGS. The auxiliary baffle plate 16 is shown in FIGS.
A substantially rectangular plate body 1 having a groove 17a as shown in FIG.
7, a bent portion 18 bent and extended downward from the plate body 17 as shown in FIG. 7, and a bent portion 18 extended from the plate body 17 and the bent portion 18 as shown in FIGS. 4 and 6. The mounting portion 19 and the mounting portion 19 cover the oil strainer 3 and the upper portion in the vicinity thereof in a state where a part (the left side portion and the upper side portion in FIG. 2) overlaps the baffle plate 6.

As shown in FIG. 5, the mounting portion 19 is provided with a pipe hole 20 through which the strainer pipe 4 is inserted, and a bolt insertion hole (hereinafter referred to as a flange side hole) with the pipe hole 20 interposed therebetween. ) 21 is formed. Further, a bolt insertion hole (hereinafter referred to as a crankcase side hole) 22 is also formed in the plate body 17.

The auxiliary baffle plate 16 has a pipe hole 20.
With the strainer tube 4 inserted into the cylinder, insert a bolt (not shown) into the flange side hole 21 and a hole in the strainer flange (not shown) provided in the oil strainer 3, and screw the bolt into the crankcase 11. By doing so, it is attached to the crankcase 11 together with the oil strainer 3. Further, the auxiliary baffle plate 16 is fixed to the crankcase 11 by reinforcing it by inserting a bolt (not shown) into the crankcase side hole 22 and screwing the bolt into the crankcase 11.

When the auxiliary baffle plate 16 is attached to the crankcase 11 as described above, the plate main body 17 becomes higher on the bent portion 18 side as shown in FIG. 2 (that is, in the rotational direction R of the crankshaft 13). The oil that has flowed down to the bent portion 18 side portion of the plate main body 17 flows along the plate main body 17 and easily flows down to the baffle plate 6. In addition, as described above, when the auxiliary baffle plate 16 is attached to the crankcase 11, the opening 8a of the second oil return passage 8 is inserted into the plate body 17.
It is set so as to face the bent portion 18 side. In addition, in FIG. 2, reference symbol A indicates an engine inclination angle.

The ends of the overlapping portions of the baffle plate 6 and the auxiliary baffle plate 16 are shown in FIG.
Ribs 6 extending upward and downward, respectively, as shown in FIG.
a and 16a are provided to prevent the reverse flow of oil.

In the baffle plate structure of the internal combustion engine, the oil 2 stored in the oil pan 1 is supplied to the crankshaft 13, the cylinder liner 14, the piston 15 and the like to lubricate and cool them. The oil supplied to each part is the first, second and third oil return passages 7,
It flows down through 8 and 9. The oil that has flowed down the first oil return passage 7 flows over the baffle plate 6 and is then returned to the oil pan 1 through the tubular portion 6b formed in the baffle plate 6. At this time, since the tubular portion 6b is arranged on the wall side of the oil pan 1, that is, apart from the oil strainer 3, even if air bubbles are generated, the oil 2 of the oil pump 5 that has passed through the oil strainer 3 is passed through.
It is possible to suppress the mixture of bubbles during the suction of.

The oil that has flowed down the second oil return passage 8 falls on the plate body 17 of the auxiliary baffle plate 16 from the opening 8a thereof and flows on the plate body 17 as shown in FIG. It flows down to the plate 6, and thereafter is returned to the oil pan 1 through the tubular portion 6b in the same manner as described above. Also in this case, as described above,
Even if air bubbles are generated, the oil strainer 3
It is possible to prevent bubbles from being mixed in when the oil 2 of the oil pump 5 is sucked through. In the above-described conventional technique, the oil flowing down the second oil return passage 8 may drop near the oil strainer 3 and cause bubbles to be mixed. In contrast to this, in the present embodiment, tentatively, bubbles are generated. Even if occurs, it is possible to sufficiently increase the time and distance until the oil strainer 3 is reached, and as described above, it is possible to suppress mixing of bubbles into the oil 2 when the oil 2 is sucked by the oil pump 5. it can.

A rib 6 is provided at each end of the overlapping portion of the baffle plate 6 and the auxiliary baffle plate 16.
a and 16a are provided to prevent backflow of oil. Therefore, the oil that has flowed down from the auxiliary baffle plate 16 to the baffle plate 6 flows backward, and the baffle plate 6
Since it is prevented from falling from the end of the oil strainer 3 side, it is possible to more reliably suppress the inclusion of bubbles in the oil 2 by this amount.

The oil flowing down through the third oil return passage 9 is partially returned to the oil pan 1 through the plate body 17 of the auxiliary baffle plate 16 and directly to the oil pan 1. In this case, the third oil return passage 9
Since the opening of is separated from the oil strainer 3,
Similarly to the above, even if air bubbles are generated, it is possible to suppress the inclusion of bubbles when sucking the oil 2 of the oil pump 5 through the strainer.

As described above, even if the oil flows down in any of the first, second and third oil return passages 7, 8 and 9,
Oil 2 of oil pump 5 through oil strainer 3
Since no bubbles are mixed in when the air is sucked, the air mixing ratio of the oil 2 can be maintained at a small value. Further, since the air mixing ratio can be reduced without making the oil pan 1 deep, the oil pan 1 and hence the device are not increased in size.

Since the auxiliary baffle plate 16 and the oil strainer 3 are fastened together and fixed to the crankcase 11, the bolt to be inserted into the flange side hole 22 is commonly used.
As a result, the number of parts is reduced and the cost can be reduced.

Auxiliary baffle plate 1 of the above embodiment
Instead of 6, the auxiliary baffle plate 16A shown in FIGS. 8 to 11 may be used. This auxiliary baffle plate 16A is one in which the bent portion 18 of the above-described embodiment is cut off and the flange side hole 22 of the plate body 17 is not provided.

In the auxiliary baffle plate 16, with the strainer pipe 4 inserted in the pipe hole 20, bolts are inserted into the flange side hole 21 and the strainer flange (not shown) provided in the oil strainer 3, By screwing this bolt into the crankcase 11, the bolt and the oil strainer 3 are fastened together and attached to the crankcase 11. In addition, the auxiliary baffle plate 1 of the above embodiment
Reference numeral 6 denotes the crankcase 1 by screwing a bolt inserted in the crankcase side hole 22 into the crankcase 11.
Although the auxiliary baffle plate 16A is configured to supplement the fixing force to the first embodiment, the bolts to be inserted into the crankcase side holes 22 of the above-described embodiment are omitted, and the number of parts and the number of assembling steps are reduced accordingly. The cost of the device can be reduced.

[0027]

According to the present invention, among the oils supplied to the crankshaft, the cylinder liner, the piston, and the like, the oil that has flowed through the oil return passage opening on the oil strainer falls on the auxiliary baffle plate and is baffled. It flows down the plate and is returned to the oil pan through the part of the baffle plate that is spaced from the oil strainer. Therefore, even if air bubbles are generated, it is possible to prevent bubbles from being mixed into the oil when the oil pump sucks the oil through the oil strainer, and it is possible to reduce the air mixing ratio. Further, since the air mixing ratio can be reduced without making the oil pan deeper, the oil pan and hence the device are not increased in size.

By providing ribs extending upward and downward at the respective ends of the overlapping portion of the baffle plate and the auxiliary baffle plate, the ribs prevent backflow of oil, so that the auxiliary baffle plate flows down to the baffle plate. It is possible to prevent the oil from dropping from the end of the baffle plate on the oil strainer side, and by this amount, it is possible to more reliably suppress the inclusion of bubbles in the oil.

[Brief description of drawings]

FIG. 1 is a plan view showing a baffle plate structure of an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a partially cut front view schematically showing the baffle plate structure.

FIG. 3 is a partially cut side view schematically showing the baffle plate structure.

FIG. 4 is a plan view showing an auxiliary baffle plate having the same baffle plate structure.

5 is a view taken in the direction of arrow E in FIG.

FIG. 6 is a view taken in the direction of arrow F in FIG.

FIG. 7 is a sectional view taken along the line BB of FIG.

FIG. 8 is a plan view showing another auxiliary baffle plate which replaces the auxiliary baffle plate of FIG.

FIG. 9 is a view taken in the direction of arrow G in FIG.

FIG. 10 is a view as seen from an arrow H in FIG.

11 is a sectional view taken along the line CC of FIG.

FIG. 12 is a plan view showing a conventional example.

[Explanation of symbols]

 1 Oil Pan 3 Oil Strainer 4 Strainer Pipe 5 Oil Pump 6 Baffle Plate 6a Rib 11 Crankcase 16 Auxiliary Baffle Plate 16a Rib 20 Pipe Hole

Claims (2)

[Claims] 1. A strainer for connecting an oil strainer and an oil pump in a baffle plate structure of an internal combustion engine in which a baffle plate is provided so as to partition the oil pan side portion and the crankcase side excluding the oil pump and the oil strainer arrangement portion. Form a hole to insert the tube,
The strainer tube is inserted through the hole, and a part of the strainer tube overlaps the baffle plate and another part covers the upper part of the oil strainer, and the other part is inclined to a higher level than the part. A baffle plate structure for an internal combustion engine, characterized in that an auxiliary baffle plate is provided. 2. The baffle plate structure for an internal combustion engine according to claim 1, wherein ribs extending upward and downward are provided at respective ends of the overlapping portions of the baffle plate and the auxiliary baffle plate.