JP7697332B2 - Oil pan - Google Patents

Description

The present invention relates to an oil pan.

An oil pan is provided at the bottom of the engine body of an internal combustion engine to store oil for lubricating the engine.

A conventional oil pan is known that has a generally box-like shape with an opening at the top and is made up of a bottom portion, a peripheral wall portion that rises upward from the periphery of the bottom portion with rounded corners, and a flange portion that extends horizontally outward from the upper edge of the peripheral wall portion (see Patent Document 1).

The peripheral wall is formed in a wavy shape along the periphery of the bottom surface when viewed from above, and is configured so that inwardly bulging convex portions and outwardly bulging concave portions alternate. This allows the peripheral wall to secure a certain amount of lubricating oil by the amount of the outwardly bulging concave portion, and the wavy shape of the peripheral wall increases the rigidity of the oil pan.

JP 2008-184924 A

However, if the level of the oil stored in the oil pan is too high, the oil may be stirred up by the crankshaft counterweight, and conversely, if the level of the oil stored in the oil pan is too low, air may be sucked into the oil pump.

For this reason, it is necessary to adjust the level of the oil stored in the oil pan to an appropriate position. However, the level of the oil stored in the oil pan is related to the amount of oil stored in the oil pan, and if the amount of oil is increased to raise the oil level, the weight of the oil increases accordingly, and there is a risk that the amount of oil discarded during an oil change will increase.

The present invention was made in response to the above-mentioned problems, and aims to provide an oil pan that can optimize the amount of oil stored in the oil pan body and the height of the oil level, while also reducing the vibration of the oil pan body.

The present invention provides an oil pan for an internal combustion engine, comprising an oil pan body including a flange portion having a rectangular opening and connected to a lower portion of an internal combustion engine body having a crankshaft, a peripheral wall extending downward from an inner edge portion of the flange portion, and a bottom wall connected to a lower end portion of the peripheral wall, the bottom wall having a deep bottom portion and a shallow bottom portion provided on one side of the deep bottom portion in the crankshaft direction and at a position higher than the deep bottom portion and connected to the deep bottom portion via a step portion, and when a specified amount of oil is poured into the oil pan body, the oil level is located above the shallow bottom portion, and the peripheral wall has a first side wall located at one end portion in the crankshaft direction, a second side wall located at the other end portion in the crankshaft direction and facing the first side wall, and a third side wall extending in the crankshaft direction along one side edge portion of the deep bottom portion and one side edge portion of the shallow bottom portion in a direction intersecting the crankshaft, and a third side wall having an upper end to which the flange portion is connected. the third side wall has a filter mounting wall and a bulging wall, the filter mounting wall protruding from an upper portion of the third side wall toward the fourth side wall and having a filter mounting surface on an underside of which an oil filter is mounted , the bulging wall bulging from the third side wall toward the fourth side wall so as to surround the oil filter, and having an upper end connected to a tip portion of the filter mounting wall in the protruding direction, and the raised bottom portion is connected to the bulging wall.

In this way, according to the present invention, it is possible to optimize the amount of oil stored in the oil pan body and the height of the oil level, and also reduce vibration of the oil pan body.

FIG. 1 is a schematic view of an internal combustion engine equipped with an oil pan according to an embodiment of the present invention, as viewed from the right. FIG. 2 is a perspective view of an oil pan according to one embodiment of the present invention. FIG. 3 is a front view of an oil pan according to one embodiment of the present invention. FIG. 4 is a plan view of an oil pan according to one embodiment of the present invention. FIG. 5 is a rear view of the oil pan according to one embodiment of the present invention. FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG.

The oil pan according to one embodiment of the present invention has an oil pan body having a rectangular opening, a flange portion connected to the lower part of an internal combustion engine body having a crankshaft, a peripheral wall extending downward from the inner edge of the flange portion, and a bottom wall connected to the lower end of the peripheral wall, the bottom wall having a deep bottom portion and a shallow bottom portion provided on one side of the deep bottom portion in the crankshaft direction and at a higher position than the deep bottom portion and connected to the deep bottom portion via a step portion, and when a specified amount of oil is poured into the oil pan body, the oil level of the oil is located above the shallow bottom portion, and the shallow bottom portion has a central bottom portion provided in the center of the shallow bottom portion in the direction intersecting the crankshaft, and a raised bottom portion provided on both sides of the central bottom portion in the direction intersecting the crankshaft and raised upward from the central bottom portion.

As a result, the oil pan according to one embodiment of the present invention can optimize the amount of oil stored in the oil pan body and the height of the oil level, and can reduce vibration of the oil pan body.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an oil pan according to the present invention will now be described with reference to the drawings.
1 to 7 are diagrams showing an oil pan according to an embodiment of the present invention. In Fig. 1 to Fig. 7, the up, down, front, rear, left and right directions are defined as follows.

The direction along the crankshaft is the left-right direction of the engine, the left side of the left wall of the oil pan along the crankshaft is the left side, and the right side of the right wall of the oil pan is the right side. The direction of the engine that is horizontally perpendicular to the crankshaft is the front-rear direction, and the direction that is vertically perpendicular to the crankshaft is the up-down direction.

First, the configuration will be described.
1, an engine 1 mounted on a vehicle includes an engine body 2 and an oil pan 10. The engine body 2 includes a cylinder block 2A that rotatably supports a crankshaft 4, and the crankshaft 4 extends in the vehicle width direction (left-right direction).

Cylinder block 2A is provided with multiple cylinders (not shown), which are arranged side by side in the vehicle width direction of engine 1. Each cylinder houses a piston (not shown), which is connected to crankshaft 4 via a connecting rod (not shown).

The pistons reciprocate within the cylinders, rotating the crankshaft 4 via the connecting rod. The engine body 2 has a cylinder head (not shown) attached to the top of the cylinder block 2A and a cylinder head cover (not shown) attached to the top of the cylinder head, but their explanation is omitted here. In this embodiment, the engine 1 constitutes an internal combustion engine, and the engine body 2 constitutes the internal combustion engine body.

As shown in Figures 2 and 3, the oil pan 10 has an oil pan body 11, which has a flange portion 12, a peripheral wall 13, and a bottom wall 14.

As shown in Figures 2 and 4, the flange portion 12 has a rectangular opening 12a. The flange portion 12 is fixed to the flange portion 2a (see Figures 6 and 7) provided at the bottom of the cylinder block 2A by bolts (not shown).

As shown in FIG. 2, the peripheral wall 13 extends downward from the inner edge 12b of the flange portion 12 and is formed in a box shape. The bottom wall 14 is connected to the lower end of the peripheral wall 13. The upper end of the peripheral wall 13 is open, and the lower end of the peripheral wall 13 is closed by the bottom wall 14.

As shown in Figures 2 and 3, the bottom wall 14 has a deep bottom portion 14A and a shallow bottom portion 14B. The deep bottom portion 14A is provided on the right side in the direction of the crankshaft 4 (hereinafter referred to as the crankshaft direction 4a). The shallow bottom portion 14B is provided on the left side (one side) of the deep bottom portion 14A and at a higher position than the deep bottom portion 14A, and is connected to the deep bottom portion 14A via a step portion 14C.

That is, the bottom wall 14 in this embodiment is formed in a stepped shape with a deep bottom portion 14A and a shallow bottom portion 14B that are different heights in the vehicle width direction.

As shown in Figures 2 and 3, the step portion 14C is provided in approximately the center of the bottom wall 14 in the crankshaft direction 4a, the deep bottom portion 14A is formed in the right half of the oil pan body 11, and the shallow bottom portion 14B is formed in the left half of the oil pan body 11.

As shown in FIG. 2, the peripheral wall 13 has a front wall 15, a rear wall 16, a left side wall 17, and a right side wall 18.

As shown in FIG. 4, the front wall 15 is connected to the front edge (one side edge) 14a of the deep bottom portion 14A and the front edge (one side edge) 14b of the shallow bottom portion 14B in the direction intersecting the crankshaft 4. The front wall 15 extends in the crankshaft direction 4a along the front edge 14a of the deep bottom portion 14A and the front edge 14b of the shallow bottom portion 14B, and the flange portion 12 is connected to the upper end portion.

The crankshaft 4 is formed in a crank shape, and the direction intersecting the crankshaft 4 is the direction that intersects the linear central axis of rotation of the crankshaft 4 in the horizontal direction. The crankshaft direction 4a is the same direction as the central axis of rotation of the crankshaft 4.

The rear wall 16 is connected to the rear edge (other side edge) 14c (see FIG. 6) of the deep bottom portion 14A and the rear edge (other side edge) 14d of the shallow bottom portion 14B in the direction intersecting with the crankshaft 4.

The rear wall 16 extends in the crankshaft direction 4a along the rear edge 14c of the deep bottom portion 14A and the rear edge 14d of the shallow bottom portion 14B, and the flange portion 12 is connected to the upper end. The front wall 15 and the rear wall 16 face each other in a direction intersecting the crankshaft 4 (front-rear direction).

The left side wall 17 is located at the left end (one end) of the crankshaft direction 4a and connects the left end of the front wall 15, the left end of the rear wall 16, and the left end of the shallow bottom portion 14B.

The right side wall 18 is located at the right end (other end) in the crankshaft direction 4a and connects the right end of the front wall 15, the right end of the rear wall 16, and the right end of the deep bottom portion 14A. The left side wall 17 faces the right side wall 18 in the crankshaft direction 4a.

In this embodiment, the left side wall 17 constitutes the first side wall, the right side wall 18 constitutes the second side wall, the front wall 15 constitutes the third side wall, and the rear wall 16 constitutes the fourth side wall.

As shown in Figures 2 and 4, the shallow bottom portion 14B has a central bottom portion 14D, a front raised bottom portion 14E, and a rear raised bottom portion 14F.

The central bottom portion 14D is located at the center of the shallow bottom portion 14B in the fore-and-aft direction (horizontal direction) that intersects with the crankshaft 4.

The front raised bottom 14E is provided on the front side of the central bottom 14D in the fore-and-aft direction intersecting with the crankshaft 4, and is raised upward from the central bottom 14D (see Figure 7).

The front end of the front raised bottom portion 14E is connected to the front wall 15 (see FIG. 7). The front end of the front raised bottom portion 14E is the front edge portion 14b of the shallow bottom portion 14B.

The rear raised bottom 14F is provided on the rear side of the central bottom 14D in the front-to-rear direction intersecting with the crankshaft 4, and is raised upward from the central bottom 14D (see FIG. 7). The rear end of the rear raised bottom 14F is connected to the rear wall 16 (see FIG. 7). The rear end of the rear raised bottom 14F is the rear edge 14d of the shallow bottom 14B.

As shown in FIG. 7, the front raised bottom 14E is located at a higher position than the rear raised bottom 14F. This causes the central bottom 14D to protrude downward relative to the front raised bottom 14E and the rear raised bottom 14F.

In this way, the shallow bottom portion 14B has a front raised bottom portion 14E and a rear raised bottom portion 14F that are raised upward from the central bottom portion 14D on both sides in the front-to-rear direction intersecting the crankshaft 4 relative to the central bottom portion 14D. The front raised bottom portion 14E and the rear raised bottom portion 14F in this embodiment form a raised bottom.

As shown in FIG. 4, the front raised bottom 14E and the rear raised bottom 14F are formed in the entire area in the crankshaft direction 4a between the step 14C and the left side wall 17, and the left ends of the front raised bottom 14E and the rear raised bottom 14F are each connected to the left side wall 17.

As shown in Figures 1 and 4, the deep bottom portion 14A has a central deepest bottom portion 14G, a front raised bottom portion 14H, and a rear raised bottom portion 14I.

The central deepest bottom portion 14G is located in the center of the deep bottom portion 14A in the front-to-rear direction intersecting with the crankshaft 4, and is located at the lowest position in the bottom wall 14.

As shown in Figures 6 and 7, the front raised bottom 14H is provided forward of the central deepest bottom 14G in the fore-and-aft direction intersecting with the crankshaft 4, and is raised upward from the central deepest bottom 14G (see Figures 6 and 7).

The front end of the front raised bottom 14H is connected to the front wall 15. The front end of the front raised bottom 14H is the front edge 14a of the deep bottom 14A.

The rear raised bottom 14I is provided on the rear side of the central deepest bottom 14G in the fore-and-aft direction intersecting with the crankshaft 4, and is raised upward from the central deepest bottom 14G.

The rear end of the rear raised bottom 14I is connected to the rear wall 16. The rear end of the rear raised bottom 14I is the rear edge 14c of the deep bottom 14A. The rear raised bottom 14I is raised to a position higher than the front raised bottom 14H.

In this way, the deep bottom portion 14A has a front raised bottom portion 14H and a rear raised bottom portion 14I, which are raised upward from the central deepest bottom portion 14G, on both sides of the central deepest bottom portion 14G in the fore-and-aft direction intersecting with the crankshaft 4.

As shown in FIG. 4, the right ends of the front raised bottom 14H and the rear raised bottom 14I are each connected to the right side wall 18 and extend from the right side wall 18 toward the step portion 14C.

As shown in FIG. 7, the front raised bottom 14E and the rear raised bottom 14F in this embodiment have their upper surfaces 14e, 14f below the lower level L, which indicates the lowest oil level, and are located near the oil level of the lower level L.

In this embodiment, a specified amount of oil is poured into the oil pan body 11, and the oil level of the specified amount of oil is located above the shallow bottom portion 14B (i.e., the central bottom portion 14D, the front raised bottom portion 14E, and the rear raised bottom portion 14F).

The specified amount of oil means that the oil level poured into the oil pan body 11 is located at a height between the upper level H (upper limit level) and the lower level L (lower limit level).

The level of oil poured into the oil pan body 11 can be detected by an oil level gauge (not shown) and is adjusted so that it is between the lower level L mark and the upper level H mark on the oil level gauge.

As shown in Figures 2 and 4, the front wall 15 is provided with a filter mounting wall 14J and a bulging wall 14K.

The filter mounting wall 14J protrudes from the upper part of the front wall 15 near the flange portion 12 toward the rear wall 16 and is formed in a semicircular shape. The filter mounting wall 14J has a filter mounting surface 14g on its lower surface (see FIG. 7), and the oil filter 21 is attached to the filter mounting surface 14g.

As a result, the oil filter 21 is attached to the filter mounting surface 14g so as to be suspended from the filter mounting wall 14J.

As shown in FIG. 4, when the oil pan 10 is viewed from above, the bulging wall 14K bulges in a semicircular shape from the front wall 15 to the rear wall 16 so as to surround the oil filter 21 shown in phantom lines, and its upper end is connected to the tip 14j of the filter mounting wall 14J in the protruding direction.

The oil filter 21 in this embodiment is formed in a cylindrical shape, and the semicircular bulging wall 14K faces the oil filter 21 with a certain gap in the circumferential direction.

As shown in FIG. 4, when the oil pan 10 is viewed from above, the oil filter 21 is recessed inside the oil pan body 11 so that the rear end 21a is closer to the rear wall 16 than the front wall 15, and the front end 21b is exposed forward from the front wall 15.

This prevents the oil filter 21 from protruding too far outward from the oil pan body 11, reducing the installation space required for the oil filter 21.

As shown in Figures 2 and 4, the right end of the front raised bottom 14E and the left end of the front raised bottom 14H are connected to the bulging wall 14K, and oil is stored in the space above the front raised bottom 14E surrounded by the bulging wall 14K, the front wall 15, and the left side wall 17.

As shown in FIG. 4, an oil strainer 22 is installed in the oil pan body 11. The oil strainer 22 is installed above the deep bottom portion 14A, and has an oil suction port (not shown) on the underside.

The oil strainer 22 has an oil outlet 22a, which is connected to an oil pump (not shown) via an oil passage (not shown) provided in the cylinder block 2A.

When the oil pump is operated, oil is sucked in and filtered by the oil strainer 22, and the filtered oil is then sucked into the oil pump through oil piping (not shown).

The filter mounting wall 14J has an oil inlet hole 14h and an oil outlet hole 14i (see Figure 4), which are connected to the oil filter 21.

Oil drawn into the oil pump from the oil pan body 11 is discharged from the oil pump into an oil passage (not shown) provided in the cylinder block 2A, and then introduced into the oil filter 21 through the oil introduction hole 14h.

The oil introduced into the oil filter 21 is filtered by the oil filter 21 and then supplied to the lubrication parts of the engine 1 through the oil discharge hole 14i and the main gallery (not shown) provided in the cylinder block 2A.

As shown in FIG. 4, the front raised bottom 14E is provided with a rib 15A. The rib 15A protrudes upward from the front raised bottom 14E and extends from the left side wall 17 toward the oil strainer 22.

This allows the front raised bottom 14E to be reinforced by the rib 15A, increasing the rigidity of the front raised bottom 14E.

The rear raised bottom 14F is provided with a rib 15B. The rib 15B protrudes upward from the rear raised bottom 14F and extends from the rear wall 16 toward the front wall 15.

This allows the rear raised bottom 14F to be reinforced by the rib 15B, increasing the rigidity of the rear raised bottom 14F.

Ribs 15C and 15D are provided at the central deepest bottom portion 14G. Ribs 15C and 15D protrude upward from the central deepest bottom portion 14G and extend from the right side wall 18 toward the step portion 14C.

This allows the central deepest bottom portion 14G to be reinforced by the ribs 15C and 15D, increasing the rigidity of the central deepest bottom portion 14G.

As shown in Figures 4 and 5, a drain hole 14m is formed in the deep bottom portion 14A, and the drain hole 14m is closed by a plug 50 (see Figure 1). When changing oil, etc., the oil stored in the oil pan 10 is discharged from the drain hole 14m.

The oil pan 10 in this embodiment is composed of an oil pan body 11 and a plug 50.

Next, the function and effect of the oil pan 10 of this embodiment will be described.
The oil pan 10 of this embodiment has a rectangular opening 12a and is equipped with an oil pan body 11 that is composed of a flange portion 12 that is connected to the lower part of the cylinder block 2A that has the crankshaft 4, a peripheral wall 13 that extends downward from the inner edge portion 12b of the flange portion 12, and a bottom wall 14 that is connected to the lower end of the peripheral wall 13.

The bottom wall 14 has a deep bottom portion 14A and a shallow bottom portion 14B that is provided to the left (one side) of the deep bottom portion 14A in the crankshaft direction 4a and at a higher position than the deep bottom portion 14A and is connected to the deep bottom portion 14A via a step portion 14C. When a specified amount of oil is poured into the oil pan body 11, the oil level is located above the shallow bottom portion 14B.

The shallow bottom portion 14B has a central bottom portion 14D provided at the center of the shallow bottom portion 14B in the direction intersecting with the crankshaft 4, and a front raised bottom portion 14E and a rear raised bottom portion 14F provided on both sides of the central bottom portion 14D in the direction intersecting with the crankshaft 4 and raised upward from the central bottom portion 14D.

This allows the front raised bottom 14E and the rear raised bottom 14F to reduce the amount of oil stored in the shallow bottom 14B of the oil pan body 11 while raising the oil level.

Here, if the level of the oil stored in the oil pan body 11 is too high, the oil may be agitated by the counterweight (not shown) of the crankshaft 4. Conversely, if the level of the oil stored in the oil pan body 11 is too low, the oil suction port of the oil strainer 22 may suck in air, causing the oil pump to suck in air.

The oil pan 10 of this embodiment can raise the oil level stored in the oil pan body 11 by using the front raised bottom portion 14E and the rear raised bottom portion 14F, so that the oil level can be raised even if the amount of oil stored in the shallow bottom portion 14B of the oil pan body 11 is reduced.

The oil strainer 22 is installed in the deep bottom portion 14A because it draws in the oil stored in the deep bottom portion 14A through the oil suction port. In contrast, the shallow bottom portion 14B does not have an interfering object such as the oil strainer 22 installed, so it is easy to increase the size of the front raised bottom portion 14E and the rear raised bottom portion 14F.

This prevents the injection of more oil than is necessary to lubricate the engine 1 into the oil pan body 11 in order to raise the oil level stored in the oil pan body 11, and prevents the oil from being agitated by the counterweight.

In addition, it is possible to prevent the oil level from dropping due to a decrease in the amount of oil stored in the oil pan body 11, and it is possible to prevent air from being sucked into the oil pump.

In addition, the oil pan 10 of this embodiment can form a convex central bottom 14D in the shallow bottom 14B that protrudes downward relative to the front raised bottom 14E and the rear raised bottom 14F. Therefore, the convex central bottom 14D, which has an arc-shaped cross section, can function as a rib that connects the shallow bottom 14B to the step portion 14C, increasing the rigidity of the oil pan body 11 and reducing vibration of the oil pan body 11.

In this way, the oil pan 10 of this embodiment can optimize the amount of oil stored in the oil pan body 11 and the height of the oil surface, and can also reduce vibration of the oil pan body 11.

In addition, according to the oil pan 10 of this embodiment, the ribs 15A, 15B, 15C, and 15D reinforce the front raised bottom 14E, the rear raised bottom 14F, and the central deepest bottom 14G, thereby increasing the rigidity of the front raised bottom 14E, the rear raised bottom 14F, and the central deepest bottom 14G. This further increases the rigidity of the oil pan body 11, thereby more effectively reducing vibration of the oil pan body 11.

In addition, according to the oil pan 10 of this embodiment, the front raised bottom 14E and the rear raised bottom 14F have upper surfaces 14e, 14f that are below the position of the lower level L, which indicates the lowest oil level of the oil, and are provided in the vicinity of the oil level of the lower level L.

As a result, when oil is consumed by the operation of the engine 1 and the oil level drops from the upper level H to the lower level L, the oil level is prevented from dropping below the upper surfaces 14e, 14f of the front raised bottom 14E and the rear raised bottom 14F, causing the oil level to drop suddenly. This makes it possible to more effectively prevent air from being sucked into the oil pump.

In addition, according to the oil pan 10 of this embodiment, the peripheral wall 13 has a left side wall 17 located at the left end of the crankshaft direction 4a, and a right side wall 18 located at the right end of the crankshaft direction 4a and facing the left side wall 17.

In addition, the front raised bottom 14E and the rear raised bottom 14F are formed over the entire area in the crankshaft direction 4a between the step 14C and the left side wall 17.

This allows the installation area of the front raised bottom 14E and the rear raised bottom 14F to be expanded in the crankshaft direction 4a, making it easier to adjust the amount of oil stored in the oil pan body 11 and the oil level. As a result, the amount of oil stored in the oil pan body 11 and the oil level can be more effectively optimized.

In addition, according to the oil pan 10 of this embodiment, the peripheral wall 13 has a front wall 15 that extends in the crankshaft direction 4a along the front edge 14a of the deep bottom portion 14A and the front edge 14b of the shallow bottom portion 14B in a direction intersecting with the crankshaft direction 4a, and has an upper end to which the flange portion 12 is connected, and a rear wall 16 that extends in the crankshaft direction 4a along the rear edge 14c of the deep bottom portion 14A and the rear edge 14d of the shallow bottom portion 14B in a direction intersecting with the crankshaft direction 4a, and has an upper end to which the flange portion 12 is connected.

The front wall 15 has a filter mounting wall 14J, which protrudes from the top of the front wall 15 toward the rear wall 16 and has a filter mounting surface 14g on the underside of which the oil filter 21 is attached.

The front wall 15 also has a bulging wall 14K, which bulges from the front wall 15 toward the rear wall 16 so as to surround the oil filter 21, and its upper end is connected to the tip 14j of the filter mounting wall 14J in the protruding direction. In addition, the front raised bottom 14E and the front raised bottom 14H are connected to the bulging wall 14K.

This allows the volume of the oil pan body 11 to be adjusted by the bulging wall 14K, and the amount of oil stored in the oil pan body 11 and the oil level can be more effectively optimized.

In addition, the front raised bottom 14E and the front raised bottom 14H are reinforced by the bulging wall 14K, increasing the rigidity of the front raised bottoms 14E and 14H, and the bulging wall 14K increases the rigidity of the front wall 15. As a result, vibration of the oil pan body 11 can be more effectively suppressed.

Although an embodiment of the present invention has been disclosed, it is apparent that modifications may be made by one of ordinary skill in the art without departing from the scope of the present invention. All such modifications and equivalents are intended to be encompassed by the following claims.

1...engine (internal combustion engine), 2...engine body (internal combustion engine body), 4...crankshaft, 4a...crankshaft direction, 10...oil pan, 11...oil pan body, 12...flange portion, 12a...opening, 12b...inner edge portion, 13...peripheral wall, 14...bottom wall, 14A...deep bottom portion, 14a...front edge portion (one side edge portion of the deep bottom portion in a direction intersecting with the crankshaft), 14B...shallow bottom portion, 14b...front edge portion (one side edge portion of the shallow bottom portion in a direction intersecting with the crankshaft), 14C...step portion, 14c...rear edge portion (crankshaft the other side edge of the deep bottom in the direction intersecting with the crankshaft), 14D...center bottom, 14d...rear edge (the other side edge of the shallow bottom in the direction intersecting with the crankshaft), 14E...front raised bottom (raised bottom), 14F...rear raised bottom (raised bottom), 14J...filter mounting wall, 14K...bulging wall, 15...front wall (third side wall), 16...rear wall (fourth side wall), 17...left side wall (first side wall), 18...right side wall (second side wall), 21...oil filter, H...upper level (upper limit level), L...lower level (lower limit level)

Claims (1)

an oil pan body including a flange portion having a rectangular opening and connected to a lower portion of an internal combustion engine body having a crankshaft, a peripheral wall extending downward from an inner edge portion of the flange portion, and a bottom wall connected to a lower end portion of the peripheral wall,
the bottom wall has a deep bottom portion and a shallow bottom portion that is provided on one side of the deep bottom portion in the crankshaft direction and at a position higher than the deep bottom portion and is connected to the deep bottom portion via a step portion,
An oil pan for an internal combustion engine, wherein when a specified amount of oil is poured into the oil pan body, the oil level is located above the shallow bottom portion,
the peripheral wall has a first side wall located at one end in the crankshaft direction, a second side wall located at the other end in the crankshaft direction and facing the first side wall, a third side wall extending in the crankshaft direction along one side edge of the deep bottom portion and one side edge of the shallow bottom portion in a direction intersecting the crankshaft and having an upper end to which the flange portion is connected, and a fourth side wall extending in the crankshaft direction along the other side edge of the deep bottom portion and the other side edge of the shallow bottom portion in a direction intersecting the crankshaft and having an upper end to which the flange portion is connected,
The shallow bottom portion has a central bottom portion provided at a central portion of the shallow bottom portion in a direction intersecting with the crankshaft, and raised bottom portions provided on both sides of the central bottom portion in a direction intersecting with the crankshaft and raised upward from the central bottom portion ,
the third side wall has a filter mounting wall and a bulging wall;
the filter mounting wall protrudes from an upper portion of the third side wall toward the fourth side wall and has a filter mounting surface on a lower surface of which an oil filter is attached;
the bulging wall bulges from the third side wall toward the fourth side wall so as to surround the oil filter, and an upper end portion is connected to a tip end portion of the filter mounting wall in a protruding direction,
13. An oil pan for an internal combustion engine , wherein the raised bottom is connected to the protruding wall .

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