Oil pan

Abstract

To provide an oil pan that can optimize the amount of oil stored in an oil pan body and the oil level height of the oil, and can reduce vibration of the oil pan body.SOLUTION: In an oil pan 10, a bottom wall 14 of an oil pan body 11 comprises a deep bottom part 14A, and a shallow bottom part 14B provided on one side in a crankshaft direction 4a with respect to the deep bottom part 14A and at a higher position than the deep bottom part 14A, and connected to the deep bottom part 14A via a step part 14C. When a specified amount of oil is poured into the oil pan body 11, the oil level of the oil is located above the shallow bottom part 14B. The shallow bottom part 14B comprises a center bottom part 14D provided in a center part of the shallow bottom part 14B in a direction intersecting with a crankshaft 4, and a front side raised bottom part 14E and a rear side raised bottom part 14F provided on both sides in the direction intersecting with the crankshaft 4 with respect to the center bottom part 14D, and raised upward from the center bottom part 14D.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an oil pan.

Background Art

[0002] An oil pan for storing oil for lubricating an internal combustion engine is provided below the engine body of the internal combustion engine.

[0003] As a conventional oil pan, there is known one having a substantially box-shaped configuration with an open upper surface, including a bottom surface portion, a peripheral wall portion that rises integrally with rounded corners upward from the periphery of the bottom surface portion, and a flange portion that extends horizontally outward from the upper end edge of the peripheral wall portion (see Patent Document 1).

[0004] The peripheral wall portion is formed in a corrugated shape along the periphery of the bottom surface portion in plan view, and is configured such that convex portions bulging inward and concave portions bulging outward appear alternately. By virtue of the concave portions where the peripheral wall portion bulges outward, a predetermined lubricating oil capacity can be ensured, and the rigidity of the oil pan can be increased by forming the peripheral wall portion in a corrugated shape.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, if the oil level of the oil stored in the oil pan is too high, there is a risk that the oil will be agitated by the counterweight of the crankshaft. Conversely, if the oil level of the oil stored in the oil pan is too low, there is a risk that air will be sucked into the oil pump.

[0007] Therefore, it is necessary to adjust the oil level of the oil stored in the oil pan to an appropriate position. However, the oil level of the oil stored in the oil pan is related to the amount of oil stored in the oil pan. If the amount of oil is increased to raise the oil level, the weight of the oil will increase accordingly, and the amount of oil to be discarded during oil change may also increase.

[0008] The present invention is made by paying attention to the above problems, and an object thereof is 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, and can reduce the vibration of the oil pan body.

Means for Solving the Problems

[0009] The present invention includes an oil pan body configured to include a flange portion connected to the lower portion of an internal combustion engine body having a rectangular opening and 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 provided on one side in the crankshaft direction with respect to the deep bottom portion and at a position higher than the deep bottom portion, and is connected to the deep bottom portion via a stepped portion. When a specified amount of oil is injected into the oil pan body, it is an oil pan of an internal combustion engine in which the oil level of the oil 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, with the flange portion connected to the upper end portion thereof, 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, with the flange portion connected to the upper end portion thereof. The shallow bottom portion has a central bottom portion provided at a central portion of the shallow bottom portion in a direction intersecting the crankshaft, and raised bottom portions provided on both sides in a direction intersecting the crankshaft with respect to the central bottom portion and lifted 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 the upper part of the third side wall toward the fourth side wall and has a filter mounting surface on which an oil filter is mounted on the lower surface. The bulging wall bulges from the third side wall toward the fourth side wall so as to surround the oil filter, and the upper end portion thereof is connected to the tip portion in the protruding direction of the filter mounting wall. The raised bottom portion is connected to the bulging wall. It is characterized by having.

Effects of the Invention

[0010] As described above, according to the present invention, the amount of oil stored in the oil pan body and the height of the oil level can be optimized, and the vibration of the oil pan body can be reduced.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

DETAILED DESCRIPTION OF THE INVENTION

[0012] An oil pan according to an embodiment of the present invention includes an oil pan body configured to have 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 portion of the flange portion, and a bottom wall connected to the lower end portion of the peripheral wall. The bottom wall has a deep bottom portion and a shallow bottom portion provided on one side in the crankshaft direction with respect to the deep bottom portion and at a position higher than the deep bottom portion, and is connected to the deep bottom portion via a stepped portion. When a specified amount of oil is injected into the oil pan body, the oil level of the oil is located above the shallow bottom portion. The shallow bottom portion has a central bottom portion provided at the central portion of the shallow bottom portion in the direction intersecting the crankshaft, and raised bottom portions provided on both sides in the direction intersecting the crankshaft with respect to the central bottom portion and lifted upward from the central bottom portion.

[0013] Accordingly, the oil pan according to an embodiment of the present invention can optimize the amount of oil stored in the oil pan body and the height of the oil level of the oil, and can reduce the vibration of the oil pan body.

EXAMPLE

[0014] Hereinafter, an embodiment of the oil pan according to the present invention will be described with reference to the drawings. FIGS. 1 to 7 are views showing an oil pan according to an embodiment of the present invention. In FIGS. 1 to 7, the vertical, front-rear, left-right directions are defined as follows.

[0015] The direction along the crankshaft is defined as the left-right direction of the engine, the side of the left side wall of the oil pan in the direction along the crankshaft is defined as the left side, and the side of the right side wall of the oil pan is defined as the right side. Then, the direction of the engine that is horizontally orthogonal to the crankshaft is defined as the front-rear direction, and the direction that is vertically orthogonal to the crankshaft is defined as the up-down direction.

[0016] First, the configuration will be described. In FIG. 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).

[0017] The cylinder block 2A is provided with a plurality of cylinders (not shown), and the cylinders are arranged side by side in the vehicle width direction of the engine 1. Pistons (not shown) are respectively accommodated in the cylinders, and the pistons are connected to the crankshaft 4 via connecting rods (not shown).

[0018] The piston reciprocates in the cylinder to rotate the crankshaft 4 via the connecting rod. The engine body 2 has a cylinder head (not shown) attached to the upper part of the cylinder block 2A and a cylinder head cover (not shown) attached to the upper part of the cylinder head, but the description thereof is omitted. The engine 1 of the present embodiment constitutes an internal combustion engine, and the engine body 2 constitutes an internal combustion engine body.

[0019] As shown in FIGS. 2 and 3, the oil pan 10 has an oil pan body 11, and the oil pan body 11 has a flange portion 12, a peripheral wall 13, and a bottom wall 14.

[0020] As shown in FIGS. 2 and 4, the flange portion 12 has a rectangular opening 12a. The flange portion 12 is fixed to a flange portion 2a (see FIGS. 6 and 7) provided at the lower part of the cylinder block 2A by bolts (not shown).

[0021] As shown in FIG. 2, the peripheral wall 13 extends downward from the inner edge portion 12b of the flange portion 12 and is formed in a box shape. The bottom wall 14 is connected to the lower end portion of the peripheral wall 13. The upper end portion of the peripheral wall 13 is open, and the lower end portion of the peripheral wall 13 is closed by the bottom wall 14.

[0022] As shown in FIGS. 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) with respect to the deep bottom portion 14A and at a position higher than the deep bottom portion 14A, and is connected to the deep bottom portion 14A via a stepped portion 14C.

[0023] That is, the bottom wall 14 of the present embodiment is formed in a stepped shape having a deep bottom portion 14A and a shallow bottom portion 14B with different heights in the vehicle width direction.

[0024] As shown in FIGS. 2 and 3, the stepped portion 14C is provided at a substantially central portion of the bottom wall 14 in the crankshaft direction 4a. The deep bottom portion 14A is formed in the right half region of the oil pan body 11, and the shallow bottom portion 14B is formed in the left half region of the oil pan body 11.

[0025] 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.

[0026] As shown in FIG. 4, the front wall 15 is connected to the front edge portion (one side edge portion) 14a of the deep bottom portion 14A and the front edge portion (one side edge portion) 14b of the shallow bottom portion 14B in a direction intersecting the crankshaft 4. The front wall 15 extends in the crankshaft direction 4a along the front edge portion 14a of the deep bottom portion 14A and the front edge portion 14b of the shallow bottom portion 14B, and the flange portion 12 is connected to the upper end portion.

[0027] Note that although the crankshaft 4 is formed in a crank shape, the direction intersecting the crankshaft 4 is a direction that intersects the linear rotation center axis of the crankshaft 4 in the horizontal direction. Also, the crankshaft direction 4a is the same direction as the rotation center axis of the crankshaft 4.

[0028] The rear wall 16 is connected to the trailing edge (the other side edge) 14c (see FIG. 6) of the deep bottom portion 14A and the trailing edge (the other side edge) 14d of the shallow bottom portion 14B in the direction intersecting the crankshaft 4.

[0029] The rear wall 16 extends in the crankshaft direction 4a along the trailing edge 14c of the deep bottom portion 14A and the trailing edge 14d of the shallow bottom portion 14B, and the flange portion 12 is connected to the upper end portion. The front wall 15 and the rear wall 16 face each other in the direction intersecting the crankshaft 4 (front-rear direction).

[0030] The left side wall 17 is located at the left end portion (one end portion) in the crankshaft direction 4a, and connects the left end portion of the front wall 15, the left end portion of the rear wall 16, and the left end portion of the shallow bottom portion 14B.

[0031] The right side wall 18 is located at the right end portion (the other end portion) in the crankshaft direction 4a, and connects the right end portion of the front wall 15, the right end portion of the rear wall 16, and the right end portion of the deep bottom portion 14A. The left side wall 17 faces the right side wall 18 in the crankshaft direction 4a.

[0032] In this embodiment, the left side wall 17 constitutes the first side wall, and 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.

[0033] As shown in FIGS. 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.

[0034] The central bottom portion 14D is provided at the central portion in the front-rear direction (horizontal direction) intersecting the crankshaft 4 of the shallow bottom portion 14B.

[0035] The front lifting bottom 14E is provided on the front side in the front-rear direction intersecting the crankshaft 4 with respect to the central bottom 14D, and is lifted upward from the central bottom 14D (see Fig. 7).

[0036] The front end of the front lifting bottom 14E is connected to the front wall 15 (see Fig. 7). The front end of the front lifting bottom 14E is the front edge 14b of the shallow bottom 14B.

[0037] The rear lifting bottom 14F is provided on the rear side in the front-rear direction intersecting the crankshaft 4 with respect to the central bottom 14D, and is lifted upward from the central bottom 14D (see Fig. 7). The rear end of the rear lifting bottom 14F is connected to the rear wall 16 (see Fig. 7). The rear end of the rear lifting bottom 14F is the rear edge 14d of the shallow bottom 14B.

[0038] As shown in Fig. 7, the front lifting bottom 14E is located at a higher position than the rear lifting bottom 14F. Thereby, the central bottom 14D protrudes downward with respect to the front lifting bottom 14E and the rear lifting bottom 14F.

[0039] In this way, the shallow bottom 14B has the front lifting bottom 14E and the rear lifting bottom 14F lifted upward from the central bottom 14D on both sides in the front-rear direction intersecting the crankshaft 4 with respect to the central bottom 14D. The front lifting bottom 14E and the rear lifting bottom 14F of the present embodiment constitute the lifting bottom.

[0040] As shown in Fig. 4, the front lifting bottom 14E and the rear lifting bottom 14F are formed in the entire region in the crankshaft direction 4a between the step portion 14C and the left side wall 17, and the left ends of the front lifting bottom 14E and the rear lifting bottom 14F are respectively connected to the left side wall 17.

[0041] As shown in Figs. 1 and 4, the deep bottom 14A has a central deepest bottom 14G, a front lifting bottom 14H, and a rear lifting bottom 14I.

[0042] The central deepest bottom 14G is provided at the central part in the front-rear direction intersecting with the crankshaft 4 of the deep bottom 14A, and is provided at the lowest position in the bottom wall 14.

[0043] As shown in FIGS. 6 and 7, the front raised bottom 14H is provided on the front side in the front-rear direction intersecting with the crankshaft 4 with respect to the central deepest bottom 14G, and is lifted upward from the central deepest bottom 14G (see FIGS. 6 and 7).

[0044] 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.

[0045] The rear raised bottom 14I is provided on the rear side in the front-rear direction intersecting with the crankshaft 4 with respect to the central deepest bottom 14G, and is lifted upward from the central deepest bottom 14G

[0046] 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 lifted to a position higher than the front raised bottom 14H.

[0047] Thus, the deep bottom 14A has, on both sides in the front-rear direction intersecting with the crankshaft 4 with respect to the central deepest bottom 14G, the front raised bottom 14H and the rear raised bottom 14I that are lifted upward from the central deepest bottom 14G.

[0048] As shown in FIG. 4, the right end portions of the front raised bottom 14H and the rear raised bottom 14I are respectively connected to the right side wall 18, and extend from the right side wall 18 toward the stepped portion 14C.

[0049] As shown in FIG. 7, the upper surfaces 14e and 14f of the front raised bottom 14E and the rear raised bottom 14F of the present embodiment are lower than the position of the lower oil level L indicating the lower limit of the oil level of the oil, and are provided near the oil level of the lower oil level L.

[0050] The oil pan body 11 of this embodiment is filled with a specified amount of oil, and the oil level of the specified amount of oil is located above the shallow bottom portion 14B (that is, the central bottom portion 14D, the front raised bottom portion 14E, and the rear raised bottom portion 14F).

[0051] The specified amount of oil means that the oil level of the oil injected 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).

[0052] The oil level of the oil injected into the oil pan body 11 can be detected by an oil level gauge (not shown), and it is adjusted so as to be located between the mark of the lower level L and the mark of the upper level H of the oil level gauge.

[0053] As shown in FIGS. 2 and 4, a filter mounting wall 14J and a bulging wall 14K are provided on the front wall 15.

[0054] 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 semi-circular shape. The filter mounting wall 14J has a filter mounting surface 14g on the lower surface (see FIG. 7), and an oil filter 21 is mounted on the filter mounting surface 14g.

[0055] Thereby, the oil filter 21 is mounted on the filter mounting surface 14g so as to be suspended from the filter mounting wall 14J.

[0056] As shown in FIG. 4, when the oil pan 10 is viewed from above, the bulging wall 14K bulges semi-circularly from the front wall 15 toward the rear wall 16 so as to surround the oil filter 21 indicated by the virtual line, and the upper end portion is connected to the tip portion 14j in the protruding direction of the filter mounting wall 14J.

[0057] The oil filter 21 of this embodiment is formed in a cylindrical shape, and the semi-circular bulging wall 14K faces the oil filter 21 with a constant gap in the circumferential direction therebetween.

[0058] As shown in FIG. 4, when the oil pan 10 is viewed from above, the oil filter 21 enters the inside of the oil pan body 11 such that the rear end portion 21a approaches the rear wall 16 side rather than the front wall 15, and the front end portion 21b is exposed forward from the front wall 15.

[0059] Thereby, it is possible to suppress the oil filter 21 from greatly protruding outward from the oil pan body 11, and it is possible to reduce the installation space of the oil filter 21.

[0060] As shown in FIGS. 2 and 4, the right end portion of the front side raising bottom portion 14E and the left end portion of the front side raising bottom portion 14H are connected to the bulging wall 14K, and oil is stored in the space above the front side raising bottom portion 14E surrounded by the bulging wall 14K, the front wall 15, and the left side wall 17.

[0061] 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 an oil suction port (not shown) is provided on the lower surface.

[0062] An oil outlet 22a is provided in the oil strainer 22, and the oil outlet 22a is connected to an oil pump (not shown) via an oil passage (not shown) provided in the cylinder block 2A.

[0063] When the oil pump is operated, oil is sucked and filtered by the oil strainer 22, and then the filtered oil is sucked into the oil pump through an oil pipe (not shown).

[0064] An oil introduction hole 14h and an oil discharge hole 14i are formed in the filter mounting wall 14J (see FIG. 4), and the oil introduction hole 14h and the oil discharge hole 14i communicate with the oil filter 21.

[0065] The oil sucked from the oil pan body 11 by the oil pump 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.

[0066] The oil introduced into the oil filter 21 is filtered by the oil filter 21 and then supplied from the oil discharge hole 14i to the lubrication parts of the engine 1 through a main gallery (not shown) provided in the cylinder block 2A.

[0067] As shown in FIG. 4, ribs 15A are provided on the front raised bottom 14E. The ribs 15A project upward from the front raised bottom 14E and extend from the left side wall 17 toward the oil strainer 22.

[0068] Thereby, the front raised bottom 14E can be reinforced by the ribs 15A, and the rigidity of the front raised bottom 14E can be increased.

[0069] Ribs 15B are provided on the rear raised bottom 14F. The ribs 15B project upward from the rear raised bottom 14F and extend from the rear wall 16 toward the front wall 15.

[0070] Thereby, the rear raised bottom 14F can be reinforced by the ribs 15B, and the rigidity of the rear raised bottom 14F can be increased.

[0071] Ribs 15C and 15D are provided on the central deepest bottom 14G. The ribs 15C and 15D project upward from the central deepest bottom 14G and extend from the right side wall 18 toward the stepped portion 14C.

[0072] Thereby, the central deepest bottom 14G can be reinforced by the ribs 15C and 15D, and the rigidity of the central deepest bottom 14G can be increased.

[0073] As shown in FIGS. 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 FIG. 1). The oil stored in the oil pan 10 during oil change or the like is discharged from the drain hole 14m.

[0074] The oil pan 10 of this embodiment is composed of an oil pan body 11 and a plug 50.

[0075] Next, the operation 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 includes a flange portion 12 connected to the lower part of the cylinder block 2A having the crankshaft 4, a peripheral wall 13 extending downward from the inner edge portion 12b of the flange portion 12, and a bottom wall 14 connected to the lower end portion of the peripheral wall 13. The oil pan 10 is provided with an oil pan body 11.

[0076] The bottom wall 14 has a deep bottom portion 14A and a shallow bottom portion 14B provided on the left side (one side) of the deep bottom portion 14A in the crankshaft direction 4a and at a position higher 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 injected into the oil pan body 11, the oil level of the oil is located above the shallow bottom portion 14B.

[0077] 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 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 the crankshaft 4 and lifted upward from the central bottom portion 14D.

[0078] Thereby, while reducing the amount of oil stored in the shallow bottom portion 14B of the oil pan body 11 by the front raised bottom portion 14E and the rear raised bottom portion 14F, the oil level of the oil can be raised.

[0079] Here, if the oil level of the oil stored in the oil pan body 11 is too high, there is a risk that the oil will be stirred by a counterweight (not shown) of the crankshaft 4. Conversely, if the oil level of the oil stored in the oil pan body 11 is too low, there is a risk that the oil suction port of the oil strainer 22 will suck in air and the oil pump will suck in air.

[0080] The oil pan 10 of the present embodiment can raise the oil level of the oil stored in the oil pan body 11 by the front raised bottom portion 14E and the rear raised bottom portion 14F. Therefore, even when the amount of oil stored in the shallow bottom portion 14B of the oil pan body 11 is reduced, the oil level can be raised.

[0081] Further, since the oil strainer 22 sucks the oil stored in the deep bottom portion 14A from the oil suction port, it is installed in the deep bottom portion 14A. On the other hand, since no interfering object such as the oil strainer 22 is installed in the shallow bottom portion 14B, it is easy to expand the sizes of the front raised bottom portion 14E and the rear raised bottom portion 14F.

[0082] Therefore, it is possible to prevent an amount of oil exceeding the amount necessary for lubrication of the engine 1 from being injected into the interior of the oil pan body 11 to raise the oil level of the oil stored in the oil pan body 11, and it is possible to prevent the oil from being stirred by the counterweight.

[0083] In addition to this, 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 the oil pump from sucking in air.

[0084] Also, the oil pan 10 of the present embodiment can form a convex central bottom portion 14D that protrudes relatively downward with respect to the front raised bottom portion 14E and the rear raised bottom portion 14F in the shallow bottom portion 14B. For this reason, the convex central bottom portion 14D having an arc-shaped cross section can function as a rib that connects the shallow bottom portion 14B to the stepped portion 14C, and the rigidity of the oil pan body 11 can be increased to reduce the vibration of the oil pan body 11.

[0085] In this way, the oil pan 10 of the present embodiment can optimize the amount of oil stored in the oil pan main body 11 and the height of the oil level of the oil, and can reduce the vibration of the oil pan main body 11.

[0086] Moreover, according to the oil pan 10 of the present embodiment, the ribs 15A, 15B, 15C, and 15D reinforce the front raised bottom portion 14E, the rear raised bottom portion 14F, and the central deepest bottom portion 14G, and can increase the rigidity of the front raised bottom portion 14E, the rear raised bottom portion 14F, and the central deepest bottom portion 14G. Therefore, the rigidity of the oil pan main body 11 can be further increased, and the vibration of the oil pan main body 11 can be more effectively reduced.

[0087] Moreover, according to the oil pan 10 of the present embodiment, the upper surfaces 14e and 14f of the front raised bottom portion 14E and the rear raised bottom portion 14F are located below the position of the lower level L indicating the lower limit of the oil level among the oil levels of the oil, and are provided in the vicinity of the oil level of the lower level L.

[0088] Thereby, when the oil is consumed by the operation of the engine 1 and the oil level of the oil drops from the upper level H to the lower level L, it can be prevented that the oil level of the oil becomes lower than the upper surfaces 14e and 14f of the front raised bottom portion 14E and the rear raised bottom portion 14F and the oil level of the oil drops rapidly. Therefore, the suction of air into the oil pump can be more effectively prevented.

[0089] Moreover, according to the oil pan 10 of the present embodiment, the peripheral wall 13 has a left side wall 17 located at the left end portion in the crankshaft direction 4a and a right side wall 18 located at the right end portion in the crankshaft direction 4a and facing the left side wall 17.

[0090] In addition to this, the front raised bottom portion 14E and the rear raised bottom portion 14F are formed in the entire region in the crankshaft direction 4a between the stepped portion 14C and the left side wall 17.

[0091] As a result, the installation areas of the front raised bottom 14E and the rear raised bottom 14F can be expanded in the crankshaft direction 4a, and it becomes possible to easily adjust the amount of oil stored in the oil pan body 11 and the oil level of the oil. As a result, the amount of oil stored in the oil pan body 11 and the oil level of the oil can be more effectively optimized.

[0092] Further, according to the oil pan 10 of the present embodiment, the peripheral wall 13 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 the direction intersecting the crankshaft direction 4a, and the front wall 15 to which the flange portion 12 is connected at the upper end, and the rear edge 14c of the deep bottom portion 14A and the rear edge 14d of the shallow bottom portion 14B in the direction intersecting the crankshaft direction 4a And a rear wall 16 extending in the crankshaft direction 4a and having a flange portion 12 connected to the upper end portion thereof.

[0093] The front wall 15 has a filter mounting wall 14J. The filter mounting wall 14J projects from the upper portion of the front wall 15 toward the rear wall 16 and has a filter mounting surface 14g on which the oil filter 21 is mounted on the lower surface.

[0094] Further, the front wall 15 has a bulging wall 14K. The bulging wall 14K bulges from the front wall 15 toward the rear wall 16 so as to surround the oil filter 21, and the upper end portion is connected to the tip end portion 14j in the protruding direction of the filter mounting wall 14J. In addition to this, the front raised bottom 14E and the front raised bottom 14H are connected to the bulging wall 14K.

[0095] As a result, the volume of the oil pan body 11 can be adjusted by the bulging wall 14K, and the amount of oil stored in the oil pan body 11 and the oil level of the oil can be more effectively optimized.

[0096] In addition to this, the front raised bottom 14E and the front raised bottom 14H are reinforced by the bulging wall 14K, so that the rigidity of the front raised bottoms 14E and 14H can be increased, and the rigidity of the front wall 15 can be increased by the bulging wall 14K. As a result, the vibration of the oil pan body 11 can be more effectively suppressed.

[0097] Examples of the present invention have been disclosed, and it is obvious that those skilled in the art can make adjustments without departing from the scope of the present invention. It is intended that all such modifications and equivalents be included in the following claims.

Explanation of Reference Numerals

[0098] 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 Portion, 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 the Direction Intersecting the Crankshaft), 14B... Shallow Bottom Portion, 14b... Front Edge Portion (One Side Edge Portion of the Shallow Bottom Portion in the Direction Intersecting the Crankshaft), 14C... Step Portion, 14c... Rear Edge Portion (The Other Side Edge Portion of the Deep Bottom Portion in the Direction Intersecting the Crankshaft), 14D... Central Bottom Portion, 14d... Rear Edge Portion (The Other Side Edge Portion of the Shallow Bottom Portion in the Direction Intersecting the Crankshaft), 14E... Front Side Raised Bottom Portion (Raised Bottom Portion), 14F... Rear Side Raised Bottom Portion (Raised Bottom Portion), 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

【Claim 1】 An oil pan body is provided, which includes a flange portion connected to the lower part of an internal combustion engine body having a rectangular opening and a crankshaft, a peripheral wall extending downward from the inner edge portion of the flange portion, and a bottom wall connected to the lower end portion of the peripheral wall. The bottom wall has a deep bottom portion and a shallow bottom portion provided on one side in the crankshaft direction with respect to the deep bottom portion and at a position higher than the deep bottom portion, and is connected to the deep bottom portion via a stepped portion. The oil pan of the internal combustion engine, when a specified amount of oil is injected into the oil pan body, the oil level of the oil is located above the shallow bottom portion. 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, 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, with the flange portion connected to the upper end portion thereof, and a fourth side wall extending in the crankshaft direction along the other side edge portion of the deep bottom portion and the other side edge portion of the shallow bottom portion in a direction intersecting the crankshaft, with the flange portion connected to the upper end portion thereof. The shallow bottom portion has a central bottom portion provided at the central portion of the shallow bottom portion in a direction intersecting the crankshaft, and raised bottom portions provided on both sides in a direction intersecting the crankshaft with respect to the central bottom portion and lifted 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 the upper part of the third side wall toward the fourth side wall and has a filter mounting surface on which an oil filter is mounted on the lower surface. The bulging wall bulges from the third side wall toward the fourth side wall so as to surround the oil filter, and the upper end portion is connected to the tip portion in the protruding direction of the filter mounting wall. The oil pan of the internal combustion engine is characterized in that the raised bottom portion is connected to the bulging wall.

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