JP2003328719A - Oil pan structure for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide oil pan structure for an internal combustion engine that can reduce the number of parts and weight to reduce cost and minimize axial length. <P>SOLUTION: A vertical wall 3h perpendicular to a center axis 4a of a crankshaft is integrally formed at an upper part 3d of an oil pan mounted to the bottom side of a cylinder block, on the open end 3a side perpendicular to the center axis 4a of the crankshaft, and the vertical wall 3h is provided with an oil pump 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an oil pan for an internal combustion engine.

[0002]

2. Description of the Related Art As shown in FIG. 14 or FIG. 15, an oil pan 3 mounted directly to a cylinder block 1 of an internal combustion engine or via an adapter plate 2 has a box-like shape made of an aluminum alloy. Considering what is composed of the upper portion 3d and the lid-shaped lower portion 3g formed of a steel plate or an aluminum alloy, this oil pan 3 is shown in a front view in FIG. 16 and a plan view in FIG. The structure is shown in a bottom view in FIG. 18 and a partial side sectional view in FIG.

That is, a mounting surface 3e for mounting on the cylinder block 1 is formed on the upper surface of the upper portion 3d constituting the oil pan 3, and a lower mounting surface for mounting the lower portion 3g on the lower surface side of the upper portion 3d. 3f, the left end face perpendicular to the central axis 4a of the crankshaft 4 is opened to form an open end 3a, and the opposite right end face forms a closed closed end 3b. . The box-shaped upper portion 3d is provided with a baffle plate 3 for suppressing fluttering of the lubricating oil surface that occurs during operation of the internal combustion engine.
c is integrally formed. The oil pump 5 for supplying lubricating oil into the internal combustion engine is formed as a separate body and is fixed to the lower surface of the cylinder block 1 or the adapter plate 2 with a plurality of bolts 6, and the oil pump shaft 5a has a sprocket. 5b is provided for the crankshaft 4
Is transmitted to the sprocket 5b via a chain, a belt, a gear or the like, and the oil pump 5 is rotated. The oil pan 3
An oil strainer 7 for sucking the lubricating oil therein is fastened to the lower surface of the oil pump 5 with a bolt 8 or formed integrally with the oil pump 5.

In such a structure, there are problems that the number of parts is large and the cost and weight of the internal combustion engine as a whole increase, and since the oil pump 5 is a separate component, Since the reinforcing ribs for ensuring the rigidity of the oil pan 3 cannot be properly arranged in the vicinity of the portion 3d where the oil pump 5 is arranged, the rigidity of the entire oil pan 3 is insufficient and the vibration of the entire internal combustion engine is suppressed. Not be
However, there is a problem that the noise while the vehicle is running becomes worse.

In order to solve such a problem, as shown in FIG. 20, the oil pump 5 is provided coaxially with the central axis 4a of the crankshaft 4 and the oil pump 5 is provided.
Integrated with the cover 9 that covers the opening surface on the side where
A structure that reduces the number of parts is also conceivable, but in such a structure, since the oil pump 5 must be inserted into the crankshaft 4 axis, it is necessary to extend the length of the crankshaft 4 in the axial direction. Has a drawback in that the axial length of the crankshaft becomes long, and it becomes easy to be restricted in mounting the internal combustion engine on a vehicle.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. It is possible to reduce the number of parts, reduce the weight, and increase the rigidity. The first gist of the present invention is to provide an oil pan structure for an internal combustion engine which can be minimized, and an upper part to be directly attached to the bottom side of a cylinder block or via an adapter plate, and the upper part. The lower part is provided on the bottom side of the upper part, and the upper part has an opening end opened at one end side perpendicular to the central axis of the crankshaft, and prevents fluttering of the lubricating oil. In an oil pan for an internal combustion engine in which a suppressing baffle plate is integrally formed of an aluminum alloy, the crank shank is provided near the opening end side of the upper portion. Perpendicular vertical wall bets central axis of is integrally formed, on said longitudinal walls, is that the oil pump is provided for supplying lubricating oil to the internal combustion engine. The second gist is that a lower oil passage for guiding the lubricating oil in the oil pan from the oil strainer to the oil pump is integrally formed on the vertical wall or the wall surface forming the baffle plate. The third gist is that the upper oil passage for guiding the lubricating oil from the discharge side of the oil pan to the oil filter is parallel to the central axis of the crankshaft, and the baffle plate or the side wall surface of the upper portion or the baffle plate and the That is, the side wall surface is integrally formed in the connected portion. A fourth gist is that a boss portion for attaching an oil filter is integrally formed on a side wall surface side of an upper portion integrally formed with the upper oil passage.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 14 or FIG.
The front view of the oil pan 3 attached to the cylinder block 1 directly or via the adapter plate 2 is shown, FIG. 2 shows the top view, FIG. 3 shows the bottom view, and FIG. It is a side sectional view. The same parts as those in the above-described structure will be described with the same reference numerals.

The oil pan 3 is composed of an upper portion 3d and a lower portion 3g, and the upper portion 3d has surfaces 3a at the left and right ends perpendicular to the central axis 4a of the crankshaft.
Of 3b, the left side is an open end 3a, and the right side is closed to form a closed end 3b. As shown in the sectional view taken along the line AA of FIG. 5, the upper portion 3d has a baffle plate 3c integrally formed with an aluminum alloy between side wall surfaces 3p parallel to the crankshaft central axis 4a. A wall surface 3m is formed downward in a part of 3c. Further, the outer periphery of the upper surface of the upper portion 3d is a mounting surface 3e for mounting to the cylinder block 1 or the adapter plate 2, and the outer periphery of the lower surface of the upper portion 3d is a lower mounting surface 3f for mounting the lower portion 3g. . A vertical wall 3h perpendicular to the crankshaft center axis 4a is integrally formed near the opening end 3a side of the box-shaped upper portion 3d perpendicular to the crankshaft center axis 4a.
The oil pump 5 is attached to the vertical wall 3h.

6 is a sectional view taken along the line BB of FIG. 4, FIG. 7 is a sectional view taken along the line CC of FIG. 6, and FIG. 8 is a sectional view taken along the line DD of FIG. FIG. 9 is a sectional view, and FIG.
As shown in FIGS. 6, 7 and 8, the vertical wall 3h perpendicular to the crankshaft central axis 4a is formed in a hollow shape, and is a cross-sectional view taken along the line E, and the oil pump 5 extends from the opening end 3a side. Is attached with a bolt, and the gear 5 of the oil pump 5 is
c is arranged in the vertical wall 3h, and an oil chamber is formed in the vertical wall 3h in which the gear 5c is enclosed, and the shaft 5a of the oil pump is projected toward the opening end 3a side and is attached to the tip of the shaft 5a. A sprocket 5b is provided, and a chain, a belt, a gear, or the like is mounted on the sprocket 5b so that the rotational force from the crankshaft 4 is transmitted.

On the bottom side of the baffle plate 3c of the upper portion 5d, there is provided an oil strainer 7 having a suction port 7a facing downward toward the lower portion 3g. This oil strainer 7 is an oil pan. It is arranged at a position where it is submerged in the lubricating oil accumulated in the inside. Also,
As shown in FIGS. 5 and 9, the lower oil passage 3j that connects the suction port 7a of the oil strainer 7 and the gear 5c of the oil pump 5 to each other is a wall surface 3m that forms the baffle plate 3c.
Is formed integrally with the central axis 4a of the crankshaft on the bottom side thereof, and is communicated with an oil chamber in the vertical wall 3h through an intake port 7d opened in the vertical wall 3h. Therefore, the lower oil passage 3j can guide the lubricating oil sucked up from the oil strainer 7 from the suction port 7b to the gear 5c of the oil pump.

Further, as shown in FIGS. 5, 6 and 7, the upper oil passage 3n for guiding the lubricating oil from the smooth cross-sectional area changing portion 7c on the discharge side of the oil pump 5 to the oil filter 8 side.
Is formed integrally with the baffle plate 3c in parallel with the crankshaft central axis 4a, or the side wall surface 3p on one side of the upper portion 3d parallel to the crankshaft central axis 4a, or the portion where the baffle plate 3c and the side wall surface 3p are connected. Has been done. Therefore, the lubricating oil discharged by the rotation of the gear 5c of the oil pump is supplied to the internal combustion engine through the upper oil passage 3n and the oil filter 8.

The lower oil passage 3j and the upper oil passage 3n are
Even in the method of casting an aluminum alloy, it is possible to integrally form the upper portion 3d of the oil pan by pressure die casting which is relatively inexpensive. Also, the vertical wall 3
h can also be integrally formed satisfactorily, and the vertical wall 3h, the lower oil passage 3j, and the upper oil passage 3n can function not only as an oil passage but also as a rigid member that enhances the rigidity of the upper portion 3d. Thus, the rigidity of the oil pan 3 as a whole is improved.

The front view of FIG. 10, the plan view of FIG. 11, the bottom view of FIG. 12, and the side sectional view of FIG. 13 are modified examples. As shown in, the boss portion 3q communicating with the above-mentioned upper oil passage 3n is integrally formed on the side wall surface 3p of the upper portion 3d, and the oil filter 8 can be attached to the boss portion 3q from the outside. If the boss 3q is integrally formed in this way, the oil filter 8 can be easily replaced, and the dust in the lubricating oil can be satisfactorily captured through the oil filter 8 The lubricating oil from which is removed can be satisfactorily supplied into the internal combustion engine.

[0014]

The present invention is composed of an upper portion which is directly attached to the bottom side of a cylinder block or through an adapter plate, and a lower portion which is provided on the bottom side of the upper portion. The upper portion includes a crank. In an oil pan for an internal combustion engine, an opening end is formed that is open at one end perpendicular to the central axis of the shaft, and a baffle plate that suppresses fluttering of lubricating oil is integrally formed of an aluminum alloy. A vertical wall that is perpendicular to the central axis of the crankshaft is integrally formed near the open end of the, and an oil pump that supplies lubricating oil into the internal combustion engine is provided on the vertical wall, which reduces the number of parts. The weight can be reduced, the cost can be reduced, and the length in the axial direction of the crankshaft can be minimized. It can be, and that can increase the degree of freedom in mounting on the vehicle of an internal combustion engine. In addition, the vertical wall has the effect of increasing the rigidity of the oil pan.

Further, since the lower oil passage for guiding the lubricating oil in the oil pan from the oil strainer to the oil pump is formed integrally with the vertical wall or the wall surface forming the baffle plate, the weight increase is minimized. It is possible,
Moreover, the lower passage improves the rigidity of the oil pan.

The upper oil passage for guiding the lubricating oil from the discharge side of the oil pan to the oil filter is connected to the side wall surface of the baffle plate or the upper portion or the side wall surface of the baffle plate in parallel with the central axis of the crankshaft. By being integrally formed in the part, the increase in weight can be suppressed to the minimum, and the rigidity of the oil pan can be increased.

Since the boss portion for attaching the oil filter is integrally formed on the side wall surface side of the upper portion where the upper oil passage is integrally formed, the oil filter can be attached to the boss portion from the outside. It also has the effect of facilitating the replacement of the oil filter.

[Brief description of drawings]

FIG. 1 is a front view of an oil pan.

FIG. 2 is a plan configuration diagram of FIG.

3 is a bottom view of FIG. 1. FIG.

FIG. 4 is a side sectional configuration diagram of FIG. 1.

5 is an enlarged cross-sectional view taken along the line AA of FIG.

6 is an enlarged cross-sectional view taken along the line BB of FIG.

7 is a cross-sectional view taken along line CC of FIG.

8 is an enlarged cross-sectional view taken along the line DD of FIG.

9 is a sectional view taken along line EE of FIG.

FIG. 10 is a front view of an oil pan showing a modified example.

11 is a plan configuration diagram of FIG.

12 is a bottom view of FIG. 10. FIG.

13 is a side cross-sectional configuration diagram of FIG.

FIG. 14 is a front view showing a state in which an oil pan is directly attached to a cylinder block.

FIG. 15 is a front view showing a state in which an oil pan is attached to a cylinder block through an adapter plate.

FIG. 16 is a front view of a conventional oil pan.

FIG. 17 is a plan configuration diagram of FIG. 16.

FIG. 18 is a bottom view of FIG. 16.

FIG. 19 is a partial side cross-sectional configuration diagram of FIG. 16.

FIG. 20 is a front cross-sectional configuration diagram of an oil pan showing a conventional improvement example.

[Explanation of symbols]

1 cylinder block 2 Adapter plate 3 oil pan 3a Open end 3b closed end 3c baffle plate 3d upper part 3e Mounting surface 3f lower mounting surface 3g lower part 3h vertical wall 3j Lower oil passage 3m wall 3n Upper oil passage 3p side wall surface 3q boss 4 crankshaft 4a Crankshaft central axis 5 oil pump 5a Oil pump shaft 5b sprocket 5c gear 7 Oil strainer 7a Oil strainer inlet 7b Suction port 8 oil filters

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nao Okawa             Nissan, Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan             Inside the automobile corporation F term (reference) 3G013 BB01 BB04 BB18 BD46                 3G015 BB03 BB06 BB11 BB12 BG01                       CA07 DA02 DA06 DA08

Claims (4)

[Claims] 1. A cylinder block is composed of an upper portion directly attached to the bottom side of the cylinder block or via an adapter plate, and a lower portion covered on the bottom side of the upper portion. In an oil pan for an internal combustion engine in which an opening end having one end side perpendicular to the central axis is formed, and a baffle plate that suppresses fluttering of lubricating oil is integrally formed of an aluminum alloy, An internal combustion engine characterized in that a vertical wall perpendicular to the central axis of the crankshaft is integrally formed near the opening end side, and an oil pump for supplying lubricating oil into the internal combustion engine is provided on the vertical wall. Oil pan structure. 2. A lower oil passage for guiding lubricating oil in an oil pan from an oil strainer to the oil pump is integrally formed with the vertical wall or a wall surface forming the baffle plate. The oil pan structure for an internal combustion engine according to 1. 3. An upper oil passage that guides lubricating oil from the discharge side of an oil pan to an oil filter is parallel to the central axis of the crankshaft, and the side wall surface of the baffle plate or the upper part or the side wall surface of the baffle plate and the side wall surface is formed. The integrated part is integrally formed in the connected part.
Alternatively, the oil pan structure for an internal combustion engine according to claim 2. 4. The oil for an internal combustion engine according to claim 3, wherein a boss portion for attaching an oil filter is integrally formed on a side wall surface side of an upper portion integrally formed with the upper oil passage. Bread structure.