JP3196598B2 - Baffle plate structure of internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 16 shows an example of a conventional baffle plate structure of an internal combustion engine. In the drawing, an oil pan 1 is attached to a lower part of a crankcase formed on a lower side of a cylinder block (not shown) by fastening means (not shown) such as bolts with a gasket (not shown) interposed therebetween. 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 tube 4. A baffle plate 6 is provided to partition the oil pan 1 side portion and the crankcase side. This 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, the oil pump 5 and the oil strainer 3 are attached to the oil pan 1 to which the baffle plate 6 is welded. 3 is omitted (ie, the baffle plate 6 is
And the oil pan 1 excluding the oil strainer 3
Side part and the crankcase side) to prevent interference during assembly.

In the baffle plate structure of the internal combustion engine, oil 2 stored in an oil pan 1 is sucked up by an oil pump 5 via an oil strainer 3 and supplied to various parts (not shown) such as a crankshaft, a cylinder liner, and a piston. Lubricate and cool each part. The oil supplied to each part is supplied to the first, second, and third oil return passages 7,
It flows down 8 and 9. Here, the first, second, third
The openings on the lower side of the oil return passages 7, 8, 9 are respectively located on the upper surface of the baffle plate 6, the oil strainer 3
, And the vicinity of the oil pump 5.

[0005] After flowing down the first oil return passage 7, the oil flows through the upper surface of the baffle plate 6,
The baffle plate 6 is returned to the oil pan 1 through a cylindrical portion 6b formed on the wall side of the oil pan 1. Further, the oil flowing down the second and third oil return passages 8 and 9 flows down to the liquid level of the oil 2 of the oil pan 1 with a predetermined head.

A chain 10 (see FIG. 11) for driving the oil pump 5 is connected to an oil pump sprocket (hereinafter referred to as a sprocket) 11 as shown in FIG.
And a cover (not shown) 13 that is wound around the crankshaft 12 (see FIG. 11) and further covers the sprocket 11.
The sprocket cover 13 is formed with a through hole 13a through which the chain 10 for driving the oil pump 5 is formed.

[0007]

In the above-described baffle plate structure of the internal combustion engine, the opening 8a of the second oil return passage 8 is located near the oil strainer 3 and the oil stored in the oil pan 1 is provided. There is a predetermined drop between the second liquid level and the liquid level. For this reason, 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 are mixed with the oil strainer 3. There is a possibility that the oil 2 is sucked up by the oil pump 5 and the air mixing rate of the oil 2 (so-called aeration) becomes high.

As a countermeasure against the above-mentioned problem, it is conceivable that the oil pan 1 is deepened, and thus the oil strainer 3 is separated from the liquid surface to suppress the intrusion of bubbles. However,
In this case, the fact is that the entire engine becomes large and cannot be an appropriate improvement measure.

When oil enters the sprocket cover 13, air bubbles are mixed into the oil due to the rotation of the chain 10, and there is a possibility that the air mixing rate of the oil 2 is increased. .

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 of an internal combustion engine that can reduce the air entrapment rate without increasing the size.

[0011]

According to the first aspect of the present invention,
In a baffle plate structure of an internal combustion engine provided with a baffle plate so as to partition an oil pan side portion excluding an oil pump and an oil strainer arrangement portion and a crankcase side, a main baffle plate for covering an oil pump and an oil strainer arrangement portion is provided. The portion is provided to be inclined so as to be at a high level with respect to an end overlapping the baffle plate. Here, the level refers to a vertical positional relationship.

In this case, the auxiliary baffle plate has a sprocket cover for covering a sprocket cover provided on the oil pump, and a hole for passing a chain for driving the oil pump is formed in the sprocket cover, and the hole is formed. A rib extending upward may be formed at the peripheral end. Also,
A rib extending upward and downward may be provided at each end of the overlapping portion of the baffle plate and the auxiliary baffle plate.

According to a fourth aspect of the present invention, there is provided a baffle plate structure for an internal combustion engine, wherein a baffle plate is provided so as to partition an oil pan side portion excluding an oil pump and an oil strainer arrangement portion and a crankcase side. An auxiliary part for the cover which overlaps with the baffle plate and covers the sprocket cover provided on the oil pump at the other part, has a hole for passing the oil pump driving chain, and has a rib extending upward at a peripheral end having the hole. The baffle plate is provided so as to be inclined so that the other portion has a higher level than the one portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A baffle plate structure of an internal combustion engine according to an embodiment of the present invention will be described below with reference to FIGS. Illustration and description of members and portions equivalent to those shown in FIG. 16 will be omitted as appropriate.

1 and 2, the oil pan 1 is attached to a lower portion of a crankcase 15 formed on a lower side of a cylinder block 14 by bolts 16 with a gasket (not shown) interposed therebetween. 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 tube 4. The oil pump 5 is fixed to the crankcase 15 using bolts (not shown) inserted into holes 17a formed in the mounting flange 17 of the oil pump 5, as shown in FIG. As shown in FIG. 2, a baffle plate 6 is provided so as to partition the oil pan 1 side and the crankcase 15 side. This baffle plate 6 is welded to the oil pan 1.

In this case, when the baffle plate 6 is mounted, the oil pump 5 and the oil strainer 3 have a shape in which the upper portions are omitted (that is, the baffle plate 6 includes the oil pump 5 and the oil strainer 3). The oil pan 1 side portion excluding the disposition portion is separated from the crankcase 15 side) so as not to interfere at the time of 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 12, cylinder liner 18, piston 19 and other parts. Then, 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, and 9 as shown in FIGS.

In the baffle plate structure of the internal combustion engine, an auxiliary baffle plate 20 is further provided as shown in FIGS. Auxiliary baffle plate 2
Reference numeral 0 denotes a substantially rectangular plate main body 21 having a groove 21a and covering the upper portions of the oil pump 5 and the oil strainer 3, as shown in FIGS. And a sprocket cover portion 22 for covering the sprocket cover 13 provided in the oil pump 5 and the oil pump 5 and the oil strainer 3 in a state where the ends (the left and upper portions in FIG. 2) overlap the baffle plate 6. And the sprocket cover 13.

As shown in FIGS. 7, 10, and 11, the sprocket cover portion 22 has an elongated hole 23 through which the chain 10 for driving the oil pump 5 is formed, and the elongated hole 23 is formed. A rib extending upward at the peripheral end (hereinafter, referred to as
This is called a cover rib. ) 24 are formed. Also,
As shown in FIG. 5, a bolt insertion hole 25 is formed along the long hole 23. Auxiliary baffle plate 2
Reference numeral 0 denotes a sprocket cover 13 and an oil pump 5 by bolts (not shown) inserted into the bolt insertion holes 25.
And is fixed to the crankcase 15.

When the auxiliary baffle plate 20 is attached to the crankcase 15, as shown in FIG. 1, an overlapping portion 20a with the baffle plate 6 (left portion in FIG. 2)
The portion 20b (the right portion in FIG. 2) opposed to the overlapping portion 20a (hereinafter, referred to as an overlapping facing portion) is more gradual (that is, along the rotation direction R of the crankshaft 12) than the overlapping portion 20a. It is inclined to
The oil flowing down to the overlapping facing portion 20b is the plate body 2
1 to easily flow down to the baffle plate 6. In FIG. 2, reference symbol A indicates an engine inclination angle.
In the present embodiment, the overlapping facing portion 20b constitutes a main portion of the auxiliary baffle plate.

Each end of the overlapping portion of the baffle plate 6 and the auxiliary baffle plate 20 is provided with the one shown in FIG.
As shown in FIG. 2 and FIG. 2, ribs 6a and 20c extending upward and downward, respectively, are provided to prevent oil from flowing backward.

In the baffle plate structure of the internal combustion engine, the oil 2 stored in the oil pan 1 is supplied to each part such as the crankshaft 12, the cylinder liner 18, the piston 19, etc., to lubricate and cool each part. The oil supplied to each part is supplied to the first, second, and third oil return passages 7,
It flows down 8 and 9. Then, the oil flowing down the first oil return passage 7 flows on the baffle plate 6 and then returns to the oil pan 1 through the cylindrical portion 6b formed on the baffle plate 6. At this time, since the cylindrical portion 6b is arranged on the wall side of the oil pan 1, that is, separated from the oil strainer 3, even if air bubbles are generated, the oil 2 of the oil pump 5 passing through the oil strainer 3 is formed.
Can be prevented from being mixed in with the bubbles at the time of suction.

Also, the second and third oil return passages 8 and 9
The oil that has flowed down through the opening 8 as shown in FIG.
a, 9a, falls on the plate main body 21 of the auxiliary baffle plate 20, flows on the plate main body 21, flows down to the baffle plate 6, and thereafter returns to the oil pan 1 through the cylindrical portion 6b in the same manner as described above. Also in this case, as described above, even if air bubbles are generated, the oil 2 of the oil pump 5 passing through the oil strainer 3 is used.
At the time of suction of the foam. In the above-described prior art, the oil flowing down the second oil return passage 8 may fall near the oil strainer 3 and cause mixing of bubbles. It is possible to sufficiently increase the time and the distance until the oil reaches the oil strainer 3 even when the oil is generated. As described above, when the oil 2 is sucked by the oil pump 5, it is possible to suppress the mixing of bubbles into the oil 2. it can.

A rib 6 is provided at each end of the overlapping portion of the baffle plate 6 and the auxiliary baffle plate 20.
a, 20c are provided to prevent backflow of oil. For this reason, the oil flowing down from the auxiliary baffle plate 20 to the baffle plate 6 flows backward, and the baffle plate 6
Is prevented from dropping from the end on the oil strainer 3 side, so that it is possible to reliably prevent bubbles from being mixed into the oil 2.

The oil approaching the sprocket cover 13 flows on the sprocket cover 22 because the sprocket cover 22 of the auxiliary baffle plate 20 is arranged on the sprocket cover 13. In the same manner as described above, it flows down to the baffle plate 6 and returns to the oil pan 1 through the cylindrical portion 6b. For this reason, the intrusion of oil into the sprocket cover 13 is suppressed, and the oil 2
The mixing of bubbles into the foam is prevented. In this case, the sprocket cover portion 22 is provided with a cover rib 24, and when the oil flows through the sprocket cover portion 22, the rib 24 prevents the oil from flowing through the hole 23. Oil intrusion can be reliably prevented.

As described above, even if oil flows down 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 there is no possibility of mixing bubbles at the time of suction, oil 2
Can be maintained at a small value. In addition, since the air entrapment rate can be reduced without making the oil pan 1 deep, the oil pan 1 and hence the apparatus are not increased in size.

Since the auxiliary baffle plate 20 and the oil pump 5 are fastened together and fixed to the crankcase 15,
The bolts are shared, and the number of parts is reduced correspondingly, so that the cost can be reduced.

Auxiliary baffle plate 2 of the above embodiment
Instead of 0, an auxiliary baffle plate 27 for a cover shown in FIGS. 12 and 13 or an auxiliary baffle plate 28 for a cover shown in FIGS. 14 and 15 can be used to constitute a baffle plate structure of an internal combustion engine.

The cover auxiliary baffle plate 27 is connected to the sprocket cover 13 (FIG. 11) provided on the oil pump 5.
10), has a long hole 23 through which the chain 10 for driving the oil pump 5 passes, and further has a rib (hereinafter, referred to as a rib) extending upward at a peripheral end where the long hole 23 is formed as shown in FIG. A cover rib 24 is formed. The end of the cover auxiliary baffle plate 27 (FIG. 12)
(Upper part) overlaps with the baffle plate 6, and the main part (lower part in FIG. 12) with respect to the end is set at a high level in the mounted state. A bolt insertion hole 25 is formed along the long hole 23. The cover auxiliary baffle plate 27 is fixed to the crankcase 15 together with the sprocket cover 13 and the oil pump 5 by bolts (not shown) inserted into the bolt insertion holes 25.

The auxiliary baffle plate 28 for the cover has an oil pump mounting portion 2 in which a bolt insertion hole 29a for an oil pump is formed as compared with the auxiliary baffle plate 27 for the cover.
9 is different. The cover auxiliary baffle plate 28 is provided with an oil pump bolt insertion hole 29.
The oil pump 5 is fixed to the oil pump 5 by an oil pump bolt (not shown) inserted into the hole a, and the fixing by the bolt inserted into the bolt insertion hole 24 is reinforced.
The end (upper part in FIG. 14) of the auxiliary baffle plate 28 for the cover is attached so as to overlap with the baffle plate 6,
The main portion (the lower portion in FIG. 14) with respect to the end portion is set to have a high positional relationship with the end portion in the attached state.

The auxiliary baffle plate 27 for the cover,
In the baffle plate structure of the internal combustion engine using the sprocket cover 28, as shown in FIG. 1 and FIG. 2, the auxiliary baffle plates 27 and 28 for the cover arranged on the sprocket cover 13 receive the oil approaching the sprocket cover 13 side. The oil is prevented from entering the oil pan 13 and flows down on the auxiliary baffle plates 27 and 28 for cover to be guided to the baffle plate 6, and is returned to the oil pan 1 through the cylindrical portion 6b in the same manner as described above. In this manner, oil is prevented from entering the sprocket cover 13, and bubbles are prevented from being mixed into the oil 2 due to the rotation of the chain 10 for driving the oil pump 5.

[0032]

According to the present invention, of the oil supplied to each part such as the crankshaft, the cylinder liner and the piston, the oil flowing down the oil return passage opening on the oil strainer falls on the auxiliary baffle plate and is baffled. It flows down to the plate and is returned to the oil pan through a portion of the baffle plate that is separated from the oil strainer. For this reason, even if air bubbles are generated, it is possible to suppress the bubbles from being mixed into the oil when sucking the oil of the oil pump through the oil strainer, and to reduce the air mixing rate. Also, since the air entrapment rate can be reduced without making the oil pan deep, the oil pan and thus the device are not increased in size.

By providing the sprocket cover, the oil approaching the sprocket cover is received by the sprocket cover, flows down to the baffle plate, and returns to the oil pan. Oil is prevented from entering the sprocket cover, and thus, bubbles are prevented from entering the oil due to rotation of the chain. When the oil flows through the sprocket cover, the ribs prevent the oil from flowing through the holes, so that it is possible to reliably prevent the oil from entering the sprocket cover.

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 the backflow of oil, so that the oil flows down from the auxiliary baffle plate to the baffle plate. It is possible to prevent the oil from falling from the end of the baffle plate on the oil strainer side, and it is possible to more surely mix bubbles into the oil.

A part overlaps the baffle plate and the other part covers a sprocket cover provided on the oil pump, has a hole for passing a chain for driving the oil pump, and has a hole at a peripheral end formed with the hole. By providing an auxiliary baffle plate for a cover formed with an extending rib so as to be inclined so that the other part is at a higher level than the part, oil approaching the sprocket cover side is provided.
The cover auxiliary baffle plate disposed on the sprocket cover receives the oil to prevent the cover from entering the sprocket cover. The oil flows down on the cover auxiliary baffle plate, is guided to the baffle plate, and is returned to the oil pan. For this reason, the oil is prevented from entering the sprocket cover, and the mixing of bubbles into the oil due to the rotation of the oil pump driving chain is prevented.

[Brief description of the drawings]

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

FIG. 2 is a plan view schematically showing the baffle plate structure.

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

FIG. 4 is a bottom view showing the crankcase having the baffle plate structure.

FIG. 5 is a plan view showing an auxiliary baffle plate having the same baffle plate structure.

FIG. 6 is a view as seen from the arrow K in FIG. 5;

FIG. 7 is a sectional view taken along the line DD of FIG. 5;

FIG. 8 is a sectional view taken along the line BB of FIG. 5;

FIG. 9 is a sectional view taken along the line CC of FIG. 5;

FIG. 10 is a plan view showing a portion near the oil pump having the baffle plate structure.

FIG. 11 is a partially cutaway front view schematically showing a portion near the oil pump of the baffle plate structure.

FIG. 12 is a plan view showing an auxiliary baffle plate for a cover which replaces the auxiliary baffle plate of FIG. 5;

FIG. 13 is a side view of the auxiliary baffle plate for the cover.

FIG. 14 is a plan view showing another type of auxiliary baffle plate for a cover, which replaces the auxiliary baffle plate for a cover in FIGS. 12 and 13;

FIG. 15 is a side view of the auxiliary baffle plate for the cover.

FIG. 16 is a plan view showing an example of the related art.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 oil pan 3 oil strainer 5 oil pump 6 baffle plate 10 chain 15 crankcase 20 auxiliary baffle plate 20a overlapping part (end of auxiliary baffle plate) 20b overlapping facing part (main part of auxiliary baffle plate) 22 sprocket cover part 23 length Hole 24 Rib for cover

Claims (4)

(57) [Claims] In a baffle plate structure of an internal combustion engine provided with a baffle plate so as to partition an oil pan side portion excluding an oil pump and an oil strainer arrangement portion and a crankcase side, the oil pump and the oil strainer arrangement portion are covered. A baffle plate structure for an internal combustion engine, wherein a main part of an auxiliary baffle plate is provided so as to be inclined at a high level with respect to an end overlapping the baffle plate. 2. The auxiliary baffle plate has a sprocket cover for covering a sprocket cover provided on the oil pump, a hole for passing a chain for driving the oil pump is formed in the sprocket cover, and a peripheral portion on which the hole is formed. 2. A baffle plate structure for an internal combustion engine according to claim 1, wherein a rib extending upward is formed at an end. 3. The baffle plate structure for an internal combustion engine according to claim 1, wherein a rib extending upward and downward is provided at each end of the overlapping portion of the baffle plate and the auxiliary baffle plate. 4. In a baffle plate structure of an internal combustion engine provided with a baffle plate so as to partition an oil pan side portion excluding a portion where an oil pump and an oil strainer are arranged and a crankcase side, a part of the baffle plate overlaps with the baffle plate. The cover auxiliary baffle plate, which covers a sprocket cover provided on the oil pump, has a hole through which the oil pump driving chain passes, and has an upwardly extending rib formed at a peripheral end having the hole, A baffle plate structure for an internal combustion engine, wherein the baffle plate structure is provided so as to be inclined such that the other portion is at a higher level than the other portion.